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Grover, Anuj. "Ultra-wide voltage range SRAMs – challenges and design of SRAM with operating range of 0.35V-1.20V." Thesis, IIT Delhi, 2015. http://eprint.iitd.ac.in:80//handle/2074/8184.
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Zhao, Yiqing. "Single Phase Power Factor Correction Circuit with Wide Output Voltage Range." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/35764.
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The conventional power factor correction circuit has a fixed output voltage. However, in some applications, a PFC circuit with a wide output voltage range is needed. A single phase power factor correction circuit with wide output voltage range is developed in this work.
After a comparison of two main power stage candidates (Buck+Boost and Sepic) in terms of efficiency, complexity, cost and device rating, the buck+boost converter is employed as the variable output PFC power stage. From the loss analysis, this topology has a high efficiency from light load to heavy load.
The control system of the variable output PFC circuit is analyzed and designed. Charge average current sensing scheme has been adopted to sense the input current. The problem of high input harmonic currents at low output voltage is discussed. It is found that the current loop gain and cross over frequency will change greatly when the output voltage changes. To solve this problem, an automatic gain control scheme is proposed and a detailed circuit is designed and added to the current loop.
A modified input current sensing scheme is presented to overcome the problem of an insufficient phase margin of the PFC circuit near the maximum output voltage. The charge average current sensing circuit will be bypassed automatically by a logical circuit when the output voltage is higher than the peak line voltage. Instead, a resistor is used to sense the input current at that condition. Therefore, the phase delay caused by the charge average current sensing circuit is avoided.
The design and analysis are based on a novel air conditioner motor system application. Some detailed design issues are discussed. The experimental results show that the variable output PFC circuit has good performance in the wide output voltage range, under both the Boost mode when the output voltage is high and the Buck+Boost mode when the output voltage is low.<br>Master of Science
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Miao, Dongmin. "Voltage Stabilization Control of Wide-Speed-Range Permanent-Magnet Synchronous Generator Systems." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/246410.
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DC power systems have a constant DC-link voltage, as well as the advantages such as high stability, high efficiency, small size and light weight; therefore, they are widely used in stand-alone power systems, e.g. the power systems in aircrafts and automobiles, isolated wind power generation systems, etc. Permanent-Magnet Synchronous Generators (PMSGs) possess the advantages including high power density, high efficiency, and high control precision, and have obtained great attention and have been widely used in military, inductry, and daily life. Pulse Width Modulation (PWM) rectifier has been one of the main power conversion topologies thanks to its full controllability. The key point in the dissertation is to study the DC power system consisting of a PMSG to be the main power input device and a PWM rectifier to be the main power conversion topology. The objective of control is to output a constant DC-link voltage in a wide PMSG speed range. Since the PM-excited flux linkage is constant, when the PMSG is working at a high speed, field-weakening is needed to stabilize the stator voltage, further to stabilize the DC-link voltage. Hybrid excitation may be used to realize the field-weakening, but it has complex structure; no auxiliary devices are needed in the field regulation with the armature current, and can be easily realized with the PWM recifier and field-regulation control strategies. In this dissertation, the typical applications of the DC power systems are first introduced, with a comprehensive analysis and elaboration on the relevant research throughout the world. The research work is focused on the DC power system and its stabilization control, which is composed of a PMSG and a PWM rectifier. The involved research content in this dissertation includes the following aspects: 1. DC power system design with a wide-speed-range PMSGAs for the common DC power systems, PMSG with high power density, high efficiency is selected to the system power input device, usually with a variable-speed prime mover. The PWM rectifier with fully controlled switches is chosen to be the power conversion topology, which converts the AC power generated by PMSG into DC power, and supplies the DC load after the DC filter. The matching between the system requirements and the generator parameters are determined. Through finite-element analysis (FEA), a PMSG with strong field-weakening ability and suitable for wide-speed-range operation has been designed and manufactured, and the system test bench has been built based on dSPACE. 2. Study, analysis, optimization and experimental verification of the traditional control strategiesAccording to the PMSG designed in part 1, the DC-link model has been built, as well as the control model of the traditional control strategies, e.g. field-oriented control (FOC), direct torque control (DTC), and the effectiveness of the DC-link voltage stabilization control has been verified in a wide speed range. The theory of active damping has been proposed and analyzed, and has been utilized in the DC-link voltage control. When the load on the DC-link changes, the dynamic response of the DC-link voltage has been greatly accelerated, and it recovers quickly to its reference value. In the meantime, the performance influence of the prime mover speed on the actual system test bench should be considered. Finally, the performance of FOC and DTC has been compared and analyzed. 3. Analysis and experimental verification of the direct voltage control (DVC), and the comparative study of all the studied control strategiesThe derivation process of DVC has been theoretically analyzed: the inner current loops in FOC have been eliminated to obtain the direct voltage field-oriented control (DVFOC); the reference value of d-axis voltage in DVFOC has been replaced by the product of the stator voltage calculated by the speed and the load condition, and the sine value of load angle generated by the DC-link voltage PI controller, in order to form the DVC-1. Further, the DC-link voltage PI controller directly outputs the reference value of load angle and it becomes DVC-2. Finally, the comparative study has been carried out among all the studied control strategies.<br>Doctorat en Sciences de l'ingénieur et technologie<br>info:eu-repo/semantics/nonPublished
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Hanson, Alex J. (Alex Jordan). "Enabling HF power conversion : magnetic components and a wide voltage range converter." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105699.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 157-162).<br>High frequency switching in power converters offers the benefits of high power density and faster transient response; however, high frequency losses have limited efforts to increase frequency into the HF (3-30 MHz) regime. This thesis addresses two of the dominant frequency-dependent loss mechanisms: magnetic material core loss and switching loss. Appropriate metrics are derived to evaluate magnetic materials in core loss limited components. A survey of material core loss shows the potential for significant performance improvement in the HF regime using materials previously overlooked in the power electronics community. One such material is then used in a high frequency converter which achieves zero-voltage switching over a wide range of voltages and powers (e.g. for grid-connected applications). Using appropriate magnetic materials and converter techniques like those presented here, power densities in certain applications can be improved by an order of magnitude by operating at HF.<br>by Alex J. Hanson.<br>S.M.
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Fan, Su Yan. "Wide-input-range supply voltage tolerant capacitive sensor readout using on-chip solar cell." Thesis, University of Macau, 2015. http://umaclib3.umac.mo/record=b3335734.
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Elabd, Salma. "Analytical and Experimental Study of Wide Tuning Range Low Phase Noise mm-Wave LC-VCOs." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461251044.
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Keränen, P. (Pekka). "High precision time-to-digital converters for applications requiring a wide measurement range." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526211510.
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Abstract The aim of this work was to develop time-to-digital converters(TDC) with a wide measurement range of several hundred microseconds and with a measurement precision of a few picoseconds. Because of these requirements, the focus of this work was mainly on TDC architectures based on the Nutt interpolation method, which has several advantages when a long measurement range is a requirement. Compared to conventional data converters the characteristics of a Nutt TDC differ significantly when, for example, quantization errors and linearity errors are considered. In this thesis, the operating principle of a Nutt TDC is analysed and, in particular, the effects of reference clock instabilities are studied giving new insight how the different phase noise processes can be reliably translated into time interval jitter, and how these affect the measurement precision when very long time intervals are measured. Furthermore, these analytical results are confirmed by measurements conducted with a long-range TDC designed as part of this work. Two long-range TDCs have been designed, each based on different interpolator architectures. The first TDC utilises discrete component time-to-voltage converters(TVC) as interpolators. Other key functionality is implemented on an FPGA. The interpolators use Miller integrators to improve the linearity and the single-shot precision of the converter. The TDC has a nominal measurement range of 84ms and it achieves a single-shot precision of 2ps for time intervals shorter than 2ms, after which the precision starts to deteriorate due to the phase noise of the reference clock. In addition to the discrete TDC, an integrated long-range CMOS TDC has been designed with 0.35μm technology. Instead of TVCs, this TDC features cyclic/algorithmic interpolators, which are based on switched-frequency ring oscillators(SRO). The frequency switching is used as a mechanism to amplify quantization error, a key functionality required by any cyclic or a pipeline converter. The interpolators are combined with a 16-bit main counter giving a total range of 327μs. The RMS single-shot precision of the TDC is 4.2ps without any nonlinearity compensation. Furthermore, a calibration functionality implemented partially on-chip ensures that the accuracy of the TDC varies only ±2.5ps in a temperature range of -30C to 70C. Although implemented with fairly old technology, the interpolators’ effective linear range and precision represent state-of-the-art performance<br>Tiivistelmä Tämän työn tavoitteena oli kehittää aika-digitaalimuuntia (TDC), joilla on laaja satojen mikrosekuntien mittausalue ja muutaman pikosekunnin kertamittaustarkkuus. Näistä vaatimuksista johtuen tässä työssä keskitytään pääasiassa Nuttin interpolointimenetelmään perustuviin TDC-arkkitehtuureihin. Verrattuna tavanomaisiin datamuuntimiin, Nutt TDC:n toiminta poikkeaa merkittävästi, kun tarkastellaan kvantisointi- ja lineaarisuusvirhettä. Tässä väitöskirjatyössä Nuttin menetelmään perustavan TDC:n toiminta analysoidaan, jonka yhteydessä tutkitaan erityisesti referenssioskillaattorin epästabiilisuuksien vaikutusta mittausepävarmuuteen. Tämän pohjalta vaihekohinan eri kohinaprosessit voidaan luotettavasti muuntaa taajuustason kohinatiheysmittauksista aika-tasossa kuvattavaksi aikavälijitteriksi. Nämä teoreettiset tulokset ovat varmistettu yhdellä osana tätä työtä suunnitellulla pitkän kantaman TDC:llä. Teoreettisen tarkastelun lisäksi kaksi pitkän kantaman TDC:tä on suunniteltu, toteutettu ja testattu. Ensimmäinen näistä perustuu erilliskomponenteilla toteutettuun aika-jännitemuunnokseen (TVC) pohjautuvaan interpolointimenetelmään. Analogisten interpolaattoreiden ohella muu olennainen toiminnallisuus toteutettiin FPGA:lle. Interpolaattorit käyttävät Miller-integraattoreita lineaarisuuden ja kertamittaustarkkuuden parantamiseksi. TDC:n nimellinen mittausalue on 84ms ja sillä saavutetaan 2ps:n kertamittaustarkkuus, kun mitattava aikaväli on lyhyempi kuin 2ms, minkä jälkeen mittaustarkkuus heikkenee referenssioskillaattorin vaihekohinan vaikutuksesta. Toinen pitkän kantaman TDC perustuu 0.35μm:n CMOS teknologialla totetutettuun integroituun piiriin. Aika-jännitemuunnoksen sijasta tämä TDC perustuu sykliseen/algoritmiseen interpolointitekniikkaan, jossa taajuusmoduloitua rengasoskillaattoria(SRO) käytetään kvantisointivirheen vahvistamiseksi. Interpolaattorit ovat yhdistetty 16-bittiseen referenssioskillaattorin laskuriin, jolloin TDC:n mittausalue on noin 327μs. Tämän TDC:n RMS kertamittaustarkkuus on 4.2ps, joka saavutetaan ilman epälineaarisuuden kompensointia. Samalle piirille on lisäksi toteutettu kalibrointitoiminnallisuus, jolla varmistetaan TDC:n hyvä mittaustarkkuus kaikissa olosuhteissa. Mittaustarkkuus poikkeaa maksimissaan vain ±2.5ps, kun lämpötila on välillä -30C-70C. Vaikka TDC on toteutettu kohtalaisen vanhalla CMOS teknologialla, interpolaattoreiden efektiivinen lineaarinen alue ja mittaustarkkuus edustavat alansa huippua
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Suraparaju, Eswar Raju. "Wide Tuning Range I/Q DCO VCO and A High Resolution PFD implementation in CMOS 90 nm Technology." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1451488990.
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Wang, Lei. "Design and implementation of a three-phase three-wire thyristor controlled LC-coupling hybrid active power filter with low dc-link voltage and wide compensation range." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691876.
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Alzahrani, Saeed A. "A Systematic Low Power, Wide Tuning Range, and Low Phase Noise mm-Wave VCO Design Methodology for 5G Applications." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1578037481545091.
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Deniéport, Romain. "Amélioration du rendement énergétique et de la dynamique d'entrée de convertisseurs d’énergie isolés par l’utilisation de techniques analogiques et numériques de commande." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112381.
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Les travaux présentés ici proposent des convertisseurs d’énergie à haut rendement et très large dynamique de tension d’entrée, c'est-à-dire capables de fonctionner avec un rendement énergétique élevé sur une plage de tension d’entrée étendue (typiquement de 9V à 200V). De multiples tensions de réseaux sont standards dans l’industrie : elles sont spécifiques à un domaine (aéronautique, ferroviaire, …) et dépendent de la source primaire d’alimentation électrique (batterie d’accumulateurs, génératrice, …). Au sein d’un équipement embarqué, plusieurs réseaux peuvent cohabiter : une alimentation principale 110V et une alimentation de secours sur batterie 12V, par exemple. Le besoin de convertisseurs large dynamique d’entrée est donc une réalité, mais il n’existe sur le marché que peu de convertisseurs capables de réaliser une dynamique d’entrée supérieure à dix. Dans un premier temps, nous avons étudié les enjeux et les problématiques liés à la large dynamique d’entrée, afin de mieux cerner les limitations des topologies de puissance classiques. Nous avons ensuite traité le cas d’une architecture de conversion d’énergie de type série, dont nous avons amélioré le rendement énergétique grâce à l’utilisation de circuits d’aide à la commutation. Cette solution ayant des performances limitées, nous avons proposé de nouvelles architectures de convertisseurs DC/DC, de type parallèle, capables de supporter des dynamiques de tension d’entrée supérieures à vingt et ayant un rendement énergétique élevé (supérieur à 80%). Nous avons également étudié et mis en œuvre des stratégies de commande, numériques et analogiques, permettant de contrôler ces nouvelles topologies complexes<br>Power converters are present in virtually every embedded system, but many standards of DC networks exist: the supply voltage is depending on how the power is generated (battery, alternator …) and can range from 12V to more than 115V. When an equipment must comply with a 110V main supply and 12V back-up supply, the use of a wide input voltage range DC/DC converter is mandatory. Since classical switched mode power converters cannot achieve simultaneously high efficiency and wide input voltage range, manufacturers rarely propose DC/DC converters with an input voltage range greater than 10. This work tackles the issue of wide input voltage power conversion. After discussing about designs trade off and problems that stem from a wide input range, we try to improve the overall efficiency of a classical buck-boost converter, by using non dissipative switching-aid circuits. We also proposed a novel two stages power converter capable of dealing with very wide input voltage ranges (more than 20), without a reduction of the power efficiency. Since those new converters are far more difficult to control, some theoretical analysis was performed and some practical tests were done using complex controls laws
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van, Hoek Hauke [Verfasser]. "Design and Operation Considerations of Three-Phase Dual Active Bridge Converters for Low-Power Applications with Wide Voltage Ranges / Hauke van Hoek." Aachen : Shaker, 2017. http://d-nb.info/1138177679/34.
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Qureshi, Muhammad Shakeel. "Integrated front-end analog circuits for mems sensors in ultrasound imaging and optical grating based microphone." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29613.
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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Hasler, Paul; Committee Co-Chair: Degertekin, Levent; Committee Member: Anderson, David; Committee Member: Ayazi, Farrokh; Committee Member: Brand, Oliver; Committee Member: Hesketh, Peter. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Hoek, Hauke van [Verfasser], Doncker Rik W. [Akademischer Betreuer] De, and Jan Abraham [Akademischer Betreuer] Ferreira. "Design and operation considerations of three-phase dual active bridge converters for low-power applications with wide voltage ranges / Hauke van Hoek ; Rik W. De Doncker, Jan Abraham Ferreira." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/116284583X/34.
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Lin, Da-Wei, and 林大為. "Wide Frequency Range Voltage Controlled Ring Oscillators." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/24259325240722432205.
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碩士<br>國立暨南國際大學<br>電機工程學系<br>92<br>In this thesis, three voltage-controlled oscillators (VCOs) based on transmission gates are analyzed and compared. Wide linear tuning frequency range capability can be obtained by controlling resistances of transmission gates. These transmission-gate VCOs have the following features: no static current, no need of current biasing (nor a voltage to current converter), rail-to-rail voltage swing, no short-circuit current, and low voltage operability. However, due to the different paths for charging and discharging, the duty cycles of the transmission-gate VCO and the self-regulating VCO are varying with oscillating frequencies. On the other hand, the fast voltage swing VCO with the same charging and discharging paths can maintain a 50% duty cycle independent of oscillating frequency. Besides, the circuit also features on the faster voltage swing. Let the three VCOs be designed for operating at a same tuning range, whose maximum frequency is 1.24GHz. Simulation results show that the fast voltage swing VCO has the smallest power consumption of only 3.2mW at 900MHz.
Therefore, we implement the fast voltage swing VCO by using TSMC 0.35mm 1P4M CMOS process. Operating at y 3.3V power supply, the measurement results show that the frequency range is from 4.8Hz to 256MHz, KVCO is measured 111.16MHz/V. The peak-to-peak jitter is 30.9 ps (3.2827 ps rms) at 200MHz.
In the meantime, we incorporate the fast voltage swing VCO into PLL designs. From the simulation results, the PLLs can operate at from 60MHz to 1.24GHz. And the power consumption of the PLL(VCO) is around 5mW(3.2mW) when operating at 900MHz.
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Yu-ChenHsu and 許育晨. "A Boost Converter with Wide Input Voltage Range and Low Startup Voltage." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54377859783424521807.
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Chang, Wei-chih, and 張威銍. "Wide Range Bidirectional Mixed-Voltage-Tolerant I/O Buffer." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/61331732594863890545.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>96<br>The thesis is composed of two topics : a fully bidirectional mixed-voltage-tolerant I/O buffer using a clamping dynamic gate bias generator and a wide range fully bidirectional mixed-voltage-tolerant I/O buffer with a calibration function.
The first topic, a mixed-voltage-tolerant I/O buffer implemented in 2P4M 0.35 μm CMOS process, comprises a low-power bias circuit with clamping transistors in a feedback loop, a power supply level detector circuit, a voltage level converter circuit, a logic switch circuit, a dynamic driving detector circuit, and a clamping dynamic gate bias generator. The proposed design can transmit and receive digital signals with voltage levels of 5/3.3/1.8 V without any gate-oxide overstress and leakage current path in different voltage interface applications.
The second topic, a 0.9 V to 5.0 V (0.9/1.2/1.8/2.5/3.3/5 V) mixed-voltage-tolerant I/O buffer carried out in 2P4M 0.35 μm CMOS technology, contains a dynamic gate bias generator to provide appropri¬ate gate voltages for the output stage composed of stacked PMOS and stacked NMOS, an I/O buffer which can transmit the signal with a higher voltage level (VDDH), a floating N-well circuit to remove the body effect at the output PMOS, and a dynamic driving detector to balance the turn-on voltages for the pull-up PMOS and pull-down NMOS in the output stage. The duty cycle of the output signal of the proposed I/O buffer can then be equalized even if the output stage power supply is biased at a low voltage. In order to adapt to wide range input voltage applications, a logic calibration circuit is added in the input buffer.
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Ren, Jie. "Design of Low-Voltage Wide Tuning Range CMOS Multipass Voltage-Controlled Ring Oscillator." 2011. http://hdl.handle.net/10222/13341.
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This thesis introduces a multipass loop voltage controlled ring oscillator. The proposed structure uses cross-coupled PMOS transistors and replica bias with coarse/fine control signal. The design implemented in TSMC 90 nm CMOS technology, 0.9V power supply with frequency tuning range 481MHz to 4.08GHz and -94.17dBc/Hz at 1MHz offset from 4.08GHz with 26.15mW power consumption.
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曾冠豪. "A Wide Frequency Tuning Range and Low Control Voltage VCO." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/59548442935814621015.
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碩士<br>國立交通大學<br>電信工程研究所<br>98<br>A novel dynamic-bulk-bias (DBB) varactor is proposed, to increase frequency tuning rang of a VCO. Different from the conventional inversion-mode varactor, the DBB structure can stabilize the voltage across the varactor, which ensures the varactor to operate in the strong inversion region and gains the largest capacitance tuning range. The measurement result shows the proposed design increases the frequency tuning range by 2 times larger than that of the conventional VCOs. Here, a 5 GHz VCO is designed and fabricated by using a standard 0.18 um CMOS process. From a 0.6-V supply voltage, the VCO exhibits a frequency tuning range of 20%, a phase noise of -118 dBc/Hz at 1-MHz offset frequency and a power consumption is 4 mW. The result also shows that the DBB based VCO can operate at a lower supply voltage.
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LIAO, LIEN-HSI, and 廖連喜. "Implementation of DC-DC Converter with Wide-Range Input Voltage." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/yt38j9.
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碩士<br>國立雲林科技大學<br>電機工程系<br>106<br>This thesis studies four kinds of DC-DC converters with a wide range of input voltages. The first converter is the Flyback S21 converter, the second converter is the Flyback S22 converter, the third converter is the Forward S21 converter, and the fourth converter is the Forward S22 converter. The first two are based on the conventional flyback converters, with an S2 power switching element added to the primary and secondary sides, respectively. The latter two are based on the conventional forward converters, one S2 power switching element is added to the primary and secondary sides, similarly. The role of the S2 switch is to change the turns ratio of the transformer, with the uA 741 operational amplifier as the control IC. When the input voltage is less than the set value, the S2 switch is ON; conversely, when the input voltage is greater than the set value, the S2 switch is OFF. By changing the turns ratio between the primary side and the secondary side with the ON/OFF of the S2 power switch, the converter input voltage range can be increased. In addition, the S1 power switching element is controlled by the PWM IC TL494 to maintain the stability of the output voltage and the output current.
Firstly, this study introduces the application and types of converters. Secondly, it discusses the basic operating principles of flyback and forward converters, designs the main components of the circuit, and finally verifies their feasibility through simulation and implementation. The implemented circuits were characterized by a DC input voltage between 10 and 160V, a DC 5V output voltage, 2A load current, and 10W rated power.
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SUNG, KUAN-YI, and 宋冠毅. "Bidirectional DC-to-DC Converter With Wide-Voltage-Gain Range." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/af34qy.
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碩士<br>國立高雄科技大學<br>電機工程系<br>107<br>A bidirectional DC-to-DC converter with wide voltage gain range is proposed in this thesis. It is mainly applied to the power conversion between battery cells and DC bus in electric vehicles, which can reduce the loss of battery life. In the aspect of converter, the non-isolation structure is adopted to reduce the loss caused by leakage inductance, and has a higher gain in boost mode and buck mode. The voltage stress on the switch only needs about half of the voltage on the high voltage side. The switch with better conduction characteristics can be used in the switch selection and it only need three switches to achieve a two-way effect. The common grounding on both the input and output sides can avoid to the dv/dt problem. The converter employs a Proportional-Integral (PI) controller, which has good steady state and dynamic response, and has the function of over-current protection in boost or buck mode.
The experimental results are based on the low voltage side voltage and power of 48V and 200W respectively, and the high voltage side voltage and power of 240V and 200W respectively. Finally, Pspice simulation is used to verify the feasibility of the proposed converter. In addition, the implementation of the bidirectional converter is used to test the reliability of the proposed converter.
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Chen, Hsin-Chia, and 陳信嘉. "Development of a Resonant Power Converter with Wide Input Voltage Range." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/90412749490511988754.
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碩士<br>國立臺灣科技大學<br>電機工程系<br>101<br>The thesis aims to design a D type LLC resonant dc-dc power converter. The LLC circuit, consisting of transformer’s magnetization inductance (Lm), resonant inductor (Lr), and external capacitor (Cr), has the performance features of wide input voltage range, high switching frequency, high efficiency as well as small transformer size. For the purpose of reducing magnetic components, the magnetization inductance of the high-frequency transformer and resonant inductor, which is replaced by the leakage inductance, are designed by taking the switching frequency and the limitation of the voltage gain range into consideration. With regard to the resonant circuit, the required voltage magnification ratio and quality factor are analyzed first to derive the transformer turns ratio. Finally, the voltage transfer function of the resonant circuit is used to adjust Lm, Lr, and Cr for wide input voltage range and make primary side power MOSFET operate in zero voltage switching mode.
This thesis has completed the designs of parameter values, such as resonant converter inductances, capacitors, power components and the control circuit. Experimental evaluation yields output power and voltage of 65 W and 19.5 V, respectively, the input dc voltage range of 127 V ~ 373 V, switching frequency range of 60 kHz ~ 200 kHz, and measured system efficiency of 92.7 %.
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"Wide Input Common-mode Range Fully Integrated Low-dropout Voltage Regulators." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.38373.
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abstract: The modern era of consumer electronics is dominated by compact, portable, affordable smartphones and wearable computing devices. Power management integrated circuits (PMICs) play a crucial role in on-chip power management, extending battery life and efficiency of integrated analog, radio-frequency (RF), and mixed-signal cores. Low-dropout (LDO) regulators are commonly used to provide clean supply for low voltage integrated circuits, where point-of-load regulation is important. In System-On-Chip (SoC) applications, digital circuits can change their mode of operation regularly at a very high speed, imposing various load transient conditions for the regulator. These quick changes of load create a glitch in LDO output voltage, which hamper performance of the digital circuits unfavorably. For an LDO designer, minimizing output voltage variation and speeding up voltage glitch settling is an important task.
The presented research introduces two fully integrated LDO voltage regulators for SoC applications. N-type Metal-Oxide-Semiconductor (NMOS) power transistor based operation achieves high bandwidth owing to the source follower configuration of the regulation loop. A low input impedance and high output impedance error amplifier ensures wide regulation loop bandwidth and high gain. Current-reused dynamic biasing technique has been employed to increase slew-rate at the gate of power transistor during full-load variations, by a factor of two. Three design variations for a 1-1.8 V, 50 mA NMOS LDO voltage regulator have been implemented in a 180 nm Mixed-mode/RF process. The whole LDO core consumes 0.130 mA of nominal quiescent ground current at 50 mA load and occupies 0.21 mm x mm. LDO has a dropout voltage of 200 mV and is able to recover in 30 ns from a 65 mV of undershoot for 0-50 pF of on-chip load capacitance.<br>Dissertation/Thesis<br>Masters Thesis Electrical Engineering 2016
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Ku, Chia-Yuan, and 顧家源. "Wide Voltage Range Compact Temperature Sensor for On-Chip Thermal Monitoring." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/akc6az.
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碩士<br>國立臺灣大學<br>電子工程學研究所<br>105<br>This thesis presents an all CMOS, low power and voltage scalable temperature sensor. The proposed temperature sensor based on only a ring oscillator which operates in subthreshold region to sense temperature, resulting in a smaller area and lower power consumption than previous studies. The sensor can be operated with supply voltage from 0.6 to 1.2 V, so it can share the power grid with digital circuit without additional regulator. Also, since the sensor is compact, placing a sensor inside digital circuits to run the standard cell design flow will have smaller impact on timing constraint compared to conventional ADC-based sensors. The sensor is implemented in 0.18μm CMOS process and occupies 0.06 mm^2 while consuming 55 nW at room temperature. Accuracy of +0.34°C/-1.97°C is achieved after 2-point calibration. Error of +2.23°C/-1.53°C with no recalibration is achieved under supply voltage from 0.6 to 1.2 V. The proposed sensor is suitable for IoT systems or energy-constrained devices.
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Zeng, You-Wei, and 曾宥瑋. "Study and Implementation of a High-Voltage DC Power Supply for Wide-Range Output Voltage." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/51874345130158260233.
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碩士<br>國立臺灣科技大學<br>電子工程系<br>103<br>This thesis mainly develops a high-voltage DC power supply with a wide-range of adjustable output voltage. It focuses on the design and control of a full-bridge phase-shifted series resonant converter. The proposed full-bridge phase-shift series resonant converter features a novel two-mode operation. When low voltage output, it operates in phase-shifted PWM mode. When high voltage output, it operates in series resonant mode. In both modes, the zero voltage switching can be achieved during dead times. Therefore, the proposed converter can realize the target of high conversion efficiency for all voltage conditions.
The power-stage is a full-bridge phase-shifted series resonant converter, which has the characteristics of zero voltage switching. Since the output apply in high-pressure situations, so the secondary side choose a full bridge rectifier circuit to reduce the voltage stress. In order to implement the digital controller, the DSP chip TMS320F28035 developed by Texas Instruments is adopted. Finally, a 450W adjustable power supply with 400V input voltage and an output voltage ranging from 400V to 3000V is designed and implemented. Experimental results of the prototype converter are shown and discussed to verify the feasibility of the studied scheme.
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吳子忠. "A High Dynamic Range and Wide Voltage TuningRange AGCs for WCDMA Applications." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/44063710606618579187.
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Chang, Hung-Chia, and 張宏嘉. "Research on Power-Factor-Correction Circuit with a Wide Range Input Voltage." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/28409694115274306687.
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碩士<br>國立臺灣科技大學<br>電機工程系<br>94<br>This thesis proposes a full digital power factor correction converter for a wide range variation of input voltage. A buck converter is connected with a boost converter to achieve the two-switch boost/buck converter. The boost/buck converter can be automatically operated as a buck mode or a boost mode within a half cycle according to the input voltage. The input current is forced to have the same phase angle and waveform with the input voltage although the input voltage varies in a wide range. As a result, the power factor is near unity.
A digital signal processor ,TMS320LF2407 , is used as a controller in this thesis. In addition, the IsSpice software is used to simulate the waveforms. Experimental results validate the simulated waveforms. As a result, the results can show the correctness and feasibility of this thesis.
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Chun-WeiLin and 林峻偉. "Design and Implementation of Ozone-Driven Systems with Wide-Input Voltage Range." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/89149115880708969648.
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碩士<br>國立成功大學<br>電機工程學系<br>102<br>This thesis proposes an ozone-driven system with wide-input voltage range. This study is motivated because the traditional ozone-driven system often used different voltage sources as the input voltage, leading to the difficulty of driving the ozone ceramic chip. Moreover, since the voltage gain of resonant circuit fails to satisfy the load demands, a transformer to boost the voltage is additionally hence required. To improve these demerits, the thesis proposes a modified half-bridge circuit integrated with a resonant inverter so that input voltage can be converted to different voltage levels. In the study, the resonant circuit is well designed such that it comes with a high voltage gain and the transformer cost can be largely saved. The study also suggests a duty-cycle modulation approach by which the wide-input voltage range is achieved, the zero-voltage switching is realized, and the constant-current is completed with the feedback control. To validate the feasibility of this proposed circuit, both software simulations and hardware experiments have been made. Experimental results support the practical value of the designated ozone-driven system.
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Ou, Kai-Ping, and 歐凱萍. "High Voltage Current-Mode Buck DC-DC Converter with Wide Load Range." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/76364823023810579180.
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ZHUANG, YONG-SHENG, and 莊詠盛. "Implementation of LLC Resonant Converter with 8:1 Wide Output Voltage Range." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3sv6rw.
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碩士<br>國立雲林科技大學<br>電機工程系<br>107<br>The thesis discusses a wide-range voltage output converter which is implemented in two-stage circuit. At the first stage, the full-bridge LLC resonant converter is adopted as the main structure. An AC switch is used on the primary side of LLC resonant converter to switch the full-bridge resonant mode or half-bridge resonant mode and the voltage gain of the resonant circuit will be changed to extend the output voltage range. The second stage adopts a buck converter to further reduce output voltage in order to achieve 8:1 output voltage range in the proposed converter.
The circuit operation of the proposed converter can be divided into three modes. In the first mode, the primary side of LLC resonant converter operates in a full-bridge resonant tank and the secondary side uses a center-tapped structure. Thus, the switch of the Buck converter is always on to bypass the load current. In this mode, the output voltage range operates from 160V to 320V. In the second mode, the primary side of LLC resonant converter operates in a half-bridge resonant tank and the secondary side remains the center-tapped diode rectifier. In this mode, the output voltage range operates from 80V to 160V. In the third mode, the LLC resonant converter is a half-bridge resonant tank and the Buck converter is operated as voltage-down. In this third mode, the output voltage range reduces from 40V to 80V.
The design considerations and the operation modes of the proposed converter are analyzed in detail. The circuit effectiveness is confirmed by the simulation results. Finally, the performance of a 400W wide range output voltage experimental circuit is verified by experiments.
Keyword：resonant converter, wide output range, buck converter
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Ko, Mao-Cheng, and 柯貿晟. "Analysis and Implementation of Bidirectional Resonant Converter with Wide Input Voltage Range." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/n97mch.
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碩士<br>國立雲林科技大學<br>電機工程系<br>107<br>This thesis proposes a bidirectional CLLC resonant converter with a wide input voltage range, which can be applied to the internal energy storage system of a DC micro-grid or a hybrid electric vehicle. The converter utilizes a set of AC switches that allow the converter to be operated with full-bridge or half-bridge mode at different input voltages. By adjusting the circuit gain, the poor efficiency of the conventional resonant converter under a wide range of operations is improved.
The resonant tank adopts a CLLC filter which can achieve high voltage gain for both forward and reverse power flow operations. The power switches can achieve zero voltage switching under whole load conditions and the rectifier devices can achieve zero current switching when the converter operates in low voltage input. When the converter is operated in forward mode, the load is a battery system. The output side (battery bank) is controlled by using constant voltage and constant current control schemes. In reverse mode operation, the converter transmits energy from battery bank to high voltage grid and the constant voltage control is adopted to supply constant voltage to dc grid system.
The proposed circuit is discussed by a detail mathematical analysis and verified by using simulation software. Finally, the converter is operated in forward mode with the input voltage range from 100V to 400V and the output voltage is from 36V to 50V. The maximum load current of the proposed converter is 20A. In the reverse mode operation, the low voltage range is from 42V to 48V, the high voltage is controlled at 400V, and the total output power is 1000 watts.
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Prakash, Daiva. "Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage." Thesis, 2007. https://etd.iisc.ac.in/handle/2005/575.
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In the fast growing field of Telecommunications, the back up DC power supply plays a vital role in powering the telecom equipment. This DC power supply is a combination of AC-DC Rectifier coupled with a battery bank to support the load when AC input is not available. Figures 0.1 and 0.2 show the line diagram of the DC power supply. The power supply is the most critical element in a telecom installation and it should be highly reliable in order to have un-interrupted service.
(Fig)
Besides reliability, power density and cost are the driving forces behind the success of a power supply in the market. Off late, the reach of telecom in the society is very wide covering remote villages and major metros. Given this environment, the power supply is exposed to extreme input conditions. It is desirable to design the power supply capable of withstanding wide AC input conditions. Another advantage is that the rectifier unit will keep the battery charged so that the battery will have long life.
This thesis is aimed at designing a 1400W (56V/25A) telecom power supply, keeping in view of the issues expressed above. The aim is to design a Switched Mode Rectifier (SMR) that tolerate wide input voltage variations (90Vac to 300Vac). In addition, the design covers unity input power factor, high efficiency (> 90%), high power density ( ), parallel operation and low cost ( ).
Chapter 1 of this thesis covers the context and motivation of the work. Chapter 2 presents the design issues pertaining to power supplies. The normalized description of the power converters is presented. Such a description enables one to compare several circuit topologies in order to make effective design decisions. In a similar way the effectiveness of the switches and mgnetics are presented to enable design decisions in the output stage of the rectifier. Chapter 3 presents the design of the 1400W telecom power supply, keeping in view of the stated specifications.
The performance results of the converter are presented in Chapter 4. All the design goals have been met. The design exercise has also given insights into possible further improvements. Contributions from this work and course of future development work are indicated in the concluding chapter.
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Prakash, Daiva. "Design Of 1400W Telecom Power Supply With Wide Range Input AC Voltage." Thesis, 2007. http://hdl.handle.net/2005/575.
Full textAbstract:
In the fast growing field of Telecommunications, the back up DC power supply plays a vital role in powering the telecom equipment. This DC power supply is a combination of AC-DC Rectifier coupled with a battery bank to support the load when AC input is not available. Figures 0.1 and 0.2 show the line diagram of the DC power supply. The power supply is the most critical element in a telecom installation and it should be highly reliable in order to have un-interrupted service.
(Fig)
Besides reliability, power density and cost are the driving forces behind the success of a power supply in the market. Off late, the reach of telecom in the society is very wide covering remote villages and major metros. Given this environment, the power supply is exposed to extreme input conditions. It is desirable to design the power supply capable of withstanding wide AC input conditions. Another advantage is that the rectifier unit will keep the battery charged so that the battery will have long life.
This thesis is aimed at designing a 1400W (56V/25A) telecom power supply, keeping in view of the issues expressed above. The aim is to design a Switched Mode Rectifier (SMR) that tolerate wide input voltage variations (90Vac to 300Vac). In addition, the design covers unity input power factor, high efficiency (> 90%), high power density ( ), parallel operation and low cost ( ).
Chapter 1 of this thesis covers the context and motivation of the work. Chapter 2 presents the design issues pertaining to power supplies. The normalized description of the power converters is presented. Such a description enables one to compare several circuit topologies in order to make effective design decisions. In a similar way the effectiveness of the switches and mgnetics are presented to enable design decisions in the output stage of the rectifier. Chapter 3 presents the design of the 1400W telecom power supply, keeping in view of the stated specifications.
The performance results of the converter are presented in Chapter 4. All the design goals have been met. The design exercise has also given insights into possible further improvements. Contributions from this work and course of future development work are indicated in the concluding chapter.
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Cheng, Chun-Tai, and 鄭竣泰. "Study and Implementation of a DC Power Supply with Wide-Range Input Voltage." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/82218224295690836804.
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碩士<br>國立臺灣科技大學<br>電子工程系<br>104<br>This thesis mainly develops a DC power supply with wide-range input voltage for high voltage capacitor discharge. The power stage consists of a cascode buck DC-DC converter and a full-bridge series resonant converter. The pre-stage cascode buck converter is operated to achieve the proposed voltage adjustment from 40 V~5 kV and provide the input voltage for post-stage converter. The post-stage circuit is a full-bridge series resonant converter, which provides 400 V/500 W output voltage, and the maximum power efficiency can be 87.35%. A DSP chip TMS320F28035 developed by Texas Instruments is adopted for realizing digital controller. In this thesis, the operation principles and design considerations for a prototype system were analyzed and discussed. Experimental results of the prototype converter are shown to verify the feasibility of the studied scheme.
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Huang, Ming-Han, and 黃明瀚. "Implementation of the 1.2kW Li-ion Battery Charger with Wide Output Voltage Range." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/80967244165715193693.
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碩士<br>國立彰化師範大學<br>電機工程學系<br>102<br>The 1.2kW Li-ion battery charger with wide output voltage range is implemented in this paper. It is mainly consisted of power factor corrector and battery charging stage. There are four kinds of power factor corrector structure, including the conventional Boost Converter, the interleaved, bridgeless and the semi-bridgeless. Also, there are two kinds of battery charging stage, including the conventional full-bridge converter and full-bridge converter with current-doubler rectifier. The proposed charger is compared by the experiment to choose the better structure and promote its characteristic. Power factor feature is controlled by UCC28070 to achieve the high power factor correction. Then, battery charging stage is controlled by digital signal processor of dsPIC30F4011 to achieve the wide output voltage and the CC/CV charging function. Finally, a 1.2kW Li-ion battery charger with wide output voltage range is designed and implemented to verify the feasibility. The experimental results show that the proposed system can achieve the high power factor correction, universal input voltage, wide charging voltage range and the highest efficiency of 94.3%.
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Ye, Zih-Ming, and 葉子銘. "Study and Implementation of a DC Converter Module with Wide Input Voltage Range." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/qvdd22.
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碩士<br>國立臺灣科技大學<br>電子工程系<br>105<br>This thesis presents the implementation of a wide-input-range voltage DC-DC converter. Generally , the input voltage of a converter will be limited by duty cycle. But this thesis series a buck converter in front of an active clamp forward. The input voltage range will be larger than a normal active clamp forward converter. In addition, the PCB is made of aluminum for smaller layout. And the volume were decreased be by using planer transformer and SMD component. The operating principle of the active clamp forward converter has been analyzed in detail and describe how to make the input voltage be larger. And, implements a DC-DC converter module which is designed as input voltage range from 14 V to 160 V with an output voltage of 12V and an output power of 100 W. And the measured power efficiency is 90%.
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WU, YEN-CHEN, and 吳諺宸. "Bidirectional Series-Series Resonant DC-DC Converter with Wide Input / Output Voltage Range." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2jdca3.
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碩士<br>國立臺灣科技大學<br>電子工程系<br>106<br>A Bidirectional Series-Series Resonant DC-DC Converter with Wide Input / Output Voltage Range is proposed to achieve high efficiency and high power density power conversion in either direction. The proposed converter is fully soft switched and totally snubber-less. A mathematical software build for Circuit analysis and a prototype circuit is implement for verification. Consider a variety of situations to design a 400V conversion to 36~60V prototype circuit, the experimental results were shown to verify the performance of the proposed topology and design method. The highest applicable conversion efficiencies for the bidirectional operational modes reach 97%.
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Lin, Shih-Min, and 林士珉. "Study and Implementation of a Full-Bridge Converter with Wide Output Voltage Range." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/b3juvq.
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碩士<br>國立臺灣科技大學<br>電子工程系<br>107<br>This thesis mainly discusses the problems faced by full-bridge converters in the application of wide output voltage range. The action principle analysis of the traditional hard-switching full-bridge and full-bridge phase-shift converters will be introduced. And to explore the effect of the parasitic components on the circuit when the above two architectures are applied in a full-bridge boost/buck converter.
This thesis proposes a full-bridge converter that used the AC switch for secondary side rectification. Using two windings of secondary-side rectifying and connect their outputs in series to increase the output voltage. Through the duty cycle adjustment of the AC switch, the energy storage time of the two sets of output inductors is staggered to reduce the current peak of the primary side. When the primary side of the full bridge is in the dead time, the freewheeling is limited by the AC switch. Therefore, the voltage across the transformer will not be clamped at zero volts, so the energy on the magnetizing inductance can release the parasitic capacitance energy of the primary side power switch to zero, achieving zero voltage switching.
In the architecture part, this paper uses two sets of center-tapped rectifying windings and outputs them in series, and the rectifying diodes are replaced by AC switches. And adding a freewheeling diode to provide a freewheeling path for the output inductor. Finally, the circuit achieves an input voltage of 380 V, an output voltage range of 150 V to 500 V, an output power of 600 W, a full-bridge converter with a switching frequency of 80 kHz, and an efficiency is up to 95% at full load.
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Chen, Wen-Wey, and 陳文偉. "A Wide Dynamic Range Image Sensor Using a Voltage Adjustment Mechanism with Integration Capacitor." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/03574183449191133721.
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碩士<br>國立清華大學<br>產業研發碩士積體電路設計專班<br>95<br>This work proposes a MOSFET gate voltage adjustment mechanism with a real capacitance in 4T active pixel sensor structure to increase the dynamic range of CMOS image sensor. This 4T APS structure also combines with correlation double sampling (CDS) circuit in order to reduce fixed pattern noise. This chip utilizing a 16:10 monitor size to replace traditional 4:3 sensor array is designed by using a TSMC 0.35μm 2P4M CMOS technology therefore there will be an advantage that we don’t need to use complex base transformation between sensor and monitor. For sensor structure, (1)We use P+/Nwell/Psub material in CMOS 0.35um process to implement photo-detector. (2)An active pixel sensor is realized with 4T structure and an integration capacitor to extend dynamic range. (3) Including correlation double sampling circuit to get the signal which is more accurate and without noise. (4)Constant Gm bias is obtained to provide a power independent current. Finally, we use FPGA to implement timing control and a stable light source to illuminate sensor area to accomplish the experimental environment. Then results are measurement from digital meter or oscilloscope. From quantizing the measurement results, the dynamic range is extended as what we expect.
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CHANG, JI-WEI, and 張紀偉. "Analysis and Development of Full Bridge Phase-Shift Converter with Wide Input Voltage Range." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/58f47d.
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碩士<br>國立雲林科技大學<br>電機工程系<br>107<br>In this thesis, the full-bridge converter with phase-shift pulse-width modulation (PS-PWM) and AC switch modulation is proposed for the applications of wide input voltage range and high output currents. The proposed converter utilizes the variation of AC switch to change the turn-ratio of the transformer in order to have wide input voltage operation. By changing the turn-ratio, the proposed converter have three different operation modes (low, medium a nd high input voltage ranges). The PS-PWM scheme and AC switch modulation can be controlled to to change the turn-ratio of transformer and duty cycle at primary side so that the output voltage is controlled at the desired voltage level. On the other hand, the center-tapped rectifier is used at the secondary side. Compared with the traditional phase-shift full-bridge converter, the proposed converter has wide input voltage operation capability.
The circuit analysis and components design are discussed and presented in this paper. The simulation results with PSIM simulation software are also provided. Finally, the resulting are provided to verify the circuit performance. The electrical specifications of the proposed converter are Vin = 30V ~ 240V, Vo = 12V, Io = 35A, and Po = 420W.
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LIN, YUE, and 林岳. "Analysis and Development of Three Level Phase Shift Converter with Wide Input Voltage Range." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/2c56xj.
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碩士<br>國立雲林科技大學<br>電機工程系<br>107<br>This thesis proposes a three-level phase-shift pulse-width modulation (PWM) converter with 10:1 wide input voltage range. The main advantages of the proposed converter are wide input voltage operation and high output current capability for DC/DC converters. Based on the phase-shift PWM control approach, the leading-leg switches of three-level converter can achieve zero voltage switching (ZVS) from low load to full load. In order to solve the narrow range of input voltage opration on conventional three-level converters, a new three-level converter is proposed in this paper. Two dc split capacitors and one flying capacitor are used on the primary-side to limit the voltage stress of each power switch at one-half of input voltage. Three sets of center-tapped rectifier and three AC switches are used on the secondary-side to realize the wide input voltage operation and regulate load voltage at the desired voltage value.
The circuit operation principle of the proposed converter with wide input voltage operation is discussed and analyzed. The design procedure of circuit components is provided based on the input and output electrical specifications. The electric specificatious of the studied circuit are Vin=80V ~ 800V, Vo=12V, Io=25A and Po=300W. Finally, experiments are provided to verify the feasibility of the proposed converter.
Keywords: three−level phase-shift PWM converter, AC switch, zero voltage switching
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LIN, GUAN-HONG, and 林冠宏. "Development and Implementation of Full-Bridge LLC Resonant Converter with Wide Output Voltage Range." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/43y6k4.
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碩士<br>國立雲林科技大學<br>電機工程系<br>107<br>In this thesis, a LLC resonant converter with a wide output voltage range is proposed. The proposed converter adopts a full-bridge resonant converter on the primary side and an AC switch which can change full-bridge rectifier mode to voltage double rectifier mode on the secondary side. With the voltage gain changing, it can achieve a wide output voltage range. Besides, it utilizes the characteristics of zero voltage switching to achieve high efficiency. During the experiment, though the efficiency has been raised up, there is still a disadvantage of the LLC resonant converter. The excitation current will become larger when the converter is operated at low frequency, which would increase obvious conduction loss. In order to effectively utilize the advantages of LLC resonant converter which has zero-voltage switching and the low conduction loss over the wide range, this thesis presents a new LLC resonant converter with an AC power switch. With the help of the AC switch, it allows the variable output voltage to be expanded by more than three to four times and reach high efficiency. It effectively improves the wide output voltage range of the LLC resonant converter in a single stage.
Finally, the proposed converter is deeply analyzed by simulation software and the feasibility of the proposed converter is verified by a laboratory prototype. The practical electric specifications under the test are Vin = 400V, Vo. = 120~360V, Io = 8.333A and Po = 1kW.
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Cheng, Bo-Yin, and 鄭博尹. "A Dual-Mode Buck Converter with Low Switching Loss for Wide Input Voltage Range." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/dt8f46.
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碩士<br>國立臺灣大學<br>電子工程學研究所<br>107<br>The purpose of this thesis is to design a new off-time control method and apply it to a DC-DC buck converter. The off-time controlled circuit proposed in this thesis can make the DC-DC buck converter get the lower switching frequency for wide input voltage range. Thereby reducing the switching loss of the system to achieve higher efficiency. In addition, when the input voltage is fixed for different loads, a dual-mode design is also adopted. When the circuit is under heavy load, the circuit operates in continuous-conduction mode. When the circuit is under light load, valley switching technique is used to keep the circuit in boundary-conduction mode without entering discontinuous-conduction mode. The switching loss at light load is reduced by reducing the voltage across the power transistor during switching.
The proposed chip is fabricated using TSMC 0.35μm 2P4M CMOS process with an area of 2.174mm2. With an additional power transistor and passive components, an asynchronous buck converter is constructed. The input voltage range is from 4.5V to 5.4V. The output voltage is 1.8V. The load current range is from 0 to 1A. According to the measurement results, in the continuous-conduction mode, the efficiency can be improved by 0.33% for wide input voltage range. In the boundary-conduction mode, an efficiency improvement of 0.25% can be achieved compared to the discontinuous-conduction mode.
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Huang, Shih-Yi, and 黃世一. "Chip Design of a Wide Tuning Range and Low Supply Voltage Voltage-Controlled Oscillators for UWB and 10GHz Application." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/85929184910139003009.
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碩士<br>國立彰化師範大學<br>積體電路設計研究所<br>95<br>In this thesis, the designed two voltage-controlled oscillators are operated individually in TSMC 0.18um 1P6M RF/Mixer-signal CMOS process for the UWB system and 10GHz.
First, we propose a VCO with 2GHz tuning range. This design of the VCO is combined the way of band-switch and PMOS varactor to achieve wide tuning range. We must to design each frequency sub-band is sufficient to cover each other to sustain the robust process and environmental variation. Experimental results show that LC-VCO is -101dBc/Hz to -110dBc/Hz with 1MHz offset frequency. The oscillation frequency is ranging from 2.75GHz to 4.55 GHz and the maximum VCO gain can achieve 270MHz/V.
Second, we propose a Low voltage high performance CMOS VCO for 10 GHz application. The VCO in our design only use NMOS cross-couple pair replace with the complementary NMOS and PMOS pairs. In simulation results, the chip acheves the phase noise is -111.6dBc/Hz at 1MHz offset, tuning range from 9.74GHz to 10.57GHz and 3.6mW power consumption only for 0.8V supply voltage.
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Chen, Yan-Jhang, and 陳晏彰. "Study and Implementation of a 30 kV High-voltage DC Power Supply with a Wide-range of Adjustable Output Voltage." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/56428955630551991376.
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碩士<br>國立臺灣科技大學<br>電子工程系<br>100<br>This thesis mainly develops a 30 kV high-voltage DC power supply with a wide-range of adjustable output voltage. The power stage consists of a power factor corrector (PFC) and a buck current-fed push-pull DC-DC converter. The pre-stage PFC circuit is operated at boundary current conduction mode (BCM) to achieve high input power factor and provide a 380 V regulated DC voltage to the post-stage circuit. The buck current-fed DC-DC converter with a secondary voltage multiplier provides a high-voltage output from 5 kV to 30 kV with a rated power of 100W. A flyback converter is designed as the auxiliary power supply to provide two sets of 15V/0.2A and a 5V/2A for control stage. In this thesis, the operation principles and design considerations for the studied high-voltage power supply are discussed and analyzed. A laboratory prototype circuit is built and tested. The experimental results are shown to verify the feasibility of the proposed scheme.
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Lin, Chun-Chin, and 林春進. "Study and Design of Low Voltage Wide Tuning Range VCO and Negative Differential Resistance VCO." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/20779787874109441417.
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碩士<br>國立臺灣科技大學<br>電子工程系<br>93<br>This thesis is mainly composed of two topics, the first is the 2.4-GHz wide-band voltage controlled oscillator (VCO) with 28% frequency tuning range, the chip is fabricated by the TSMC 0.18um 1P6M CMOS technology. The LC resonator consists of two tapped inductors and varactors formed of inversion mode MOS, the balanced VCO has two differential outputs and is tuned by NMOS varactors. The second is the 1.8-GHz VCO circuit made of negative differential resistance (NDR) device, the chip is fabricated by the TSMC 0.35um 2P4M CMOS technology. In the second part N-type nMOS devices are used to realize NDR device, by which we can construct an LC tank VCO suitable for RF application. From the simulation results with Cadence Spectre RF, the design has been done with the goal of low phase noise and low power consumption.
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Chen, Chia-Min, and 陳家敏. "A New Frequency Compensated Low-Dropout Voltage Regulator With Wide Stable Range and High Precision." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/43265168327659261454.
Full textAbstract:
碩士<br>國立交通大學<br>電機學院IC設計產業專班<br>95<br>The research focuses on the realization of cap-less, wide stable range, and fast transient low dropout (LDO) linear regulator. We present two novel frequency compensation architecture for LDO circuit. The thesis provides a solution for power management system of portable devices. It can also be embedded in SoC (System on a Chip) to fully remove bulky external capacitors.
First, an enhanced active feedback frequency compensation technique is employed to improve its frequency response. This LDO can provide high stability for loading current from 0 mA to 100 mA without loading capacitors or with loading capacitors which have wide range ESR (equivalent series resistance). Moreover, this technique only requires two small compensation capacitors. This allows us to integrate the compensation capacitors within the LDO chip easily. The system has an output voltage of 1.5 V and a maximum current capability of 100 mA.
Finally, a compact CMOS voltage reference based on the mutual compensation of threshold voltage and mobility temperature coefficients with body potential trimming technique is presented. This voltage reference has a low temperature coefficient (≈ 14 ppm/℃), and the minimum supply voltage is 1V. The power supply rejection ratio without any filtering capacitor at low frequency are larger than 60 dB. The proposed chips in this thesis were fabricated using a standard TSMC 0.35 μm 2P4M CMOS process.
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Wang, Chi-Hsiung, and 王吉雄. "A Wide-Range Phase-Locked Loop with Low Voltage and Noise-Immunity for USB 2.0." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/22228248259124081147.
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碩士<br>淡江大學<br>電機工程學系碩士班<br>97<br>Nearly 30 years ago, PLL (Phase-Locked Loop, PLL) has been widely used in various research fields, including signal generators, frequency synthesizers, clock and data recovery and so on. The main function of PLL is phase locked. The applications of PLL can make frequency become faster, and make the chip''s internal phase delay bias, leading to transmission of data errors.
The emphasis on the era of high-speed transmission, PLL must have high noise immunity. There are some problems in circuits such as Jitter, Phase Error, as well as the Power Supply Noise. Because the requirement of the system frequency becomes faster and faster, power consumption becomes large. PLL is another topic of how to reduce power consumption, and in line with the specifications of today''s electronic systems.
This paper is mainly to reduce the power consumption of PLL by using low-voltage and expand the range of frequency. In this paper, switching current is adopted so wide-range PLL with low-voltage can be performed for USB 2.0.
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Mohanty, Nihar Ranjan. "Design and Analysis of an On-Board Electric Vehicle Charger for Wide Battery Voltage Range." Thesis, 2016. http://ethesis.nitrkl.ac.in/8501/1/2016_MT__214EE5261_NRMohanty.pdf.
Full textAbstract:
The scarcity of fossil fuel and the increased pollution leads the use of Electric Vehicles (EV) and Hybrid Electric Vehicles (HEV) instead of conventional Internal Combustion (IC) engine vehicles. An Electric Vehicle requires an on-board charger (OBC) to charge the propulsion battery. The objective of the project work is to design a multifunctional on-board charger that can charge the propulsion battery when the Electric Vehicle (EV) connected to the grid. In this case, the OBC plays an AC-DC converter. The surplus energy of the propulsion battery can be supplied to the grid, in this case, the OBC plays as an inverter. The auxiliary battery can be charged via the propulsion battery when PEV is in driving stage. In this case, the OBC plays like a low voltage DC-DC converter (LDC). An OBC is designed with Boost PFC converter at the first stage to obtain unity power factor with low Total Harmonic Distortion (THD) and a Bi-directional DC-DC converter to regulate the charging voltage and current of the propulsion battery. The battery is a Li-Ion battery with a nominal voltage of 360 V and can be charged from depleted voltage of 320 V to a fully charged condition of 420 V. The function of the second stage DC-DC converter is to charge the battery in a Constant Current and Constant Voltage manner. While in driving condition of the battery the OBC operates as an LDC to charge the Auxiliary battery of the vehicle whose voltage is around 12 V. In LDC operation the Bi-Directional DC-DC converter works in Vehicle to Grid (V2G) mode. A 1KW prototype of multifunctional OBC is designed and simulated in MATLAB/Simulink. The power factor obtained at full load is 0.999 with a THD of 3.65 %. The Battery is charged in A CC mode from 320 V to 420 V with a constant battery current of 2.38 A and the charging is switched into CV mode until the battery current falls below 0.24 A. An LDC is designed to charge a 12 V auxiliary battery with CV mode from the high voltage propulsion battery
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Liu, Yi-cheng, and 劉宜政. "Mixed-Voltage-Tolerant I/O Cell With Dynamic Biasing and Sub 3×VDD Wide Range Mixed-Voltage-Tolerant I/O Cell." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/aqfnzf.
Full textAbstract:
碩士<br>國立中山大學<br>電機工程學系研究所<br>97<br>The thesis is composed of tow topics: a fully bidirectional mixed- voltage-tolerant I/O cell using a new output stage circuit and a sub-3×VDD wide range fully bidirectional mixed-voltage-tolerant I/O cell.
The first topic discloses a mixed-voltage-tolerant I/O cell implemented using 2P4M 0.35 μm CMOS process, which uses a low static power dynamic gate bias generator providing three different logic voltage levels to the output stage to avoid gate oxide reliability and leakage current. The design also reveals a new output stage circuit, which enhances the output current to resolve the poor driving capability caused by the slow mobility and body effect of the stacked PMOS.
The second topic shows a sub-3×VDD wide range fully bidirectional mixed-voltage-tolerant I/O cell using 1P6M 0.18 μm CMOS process, which employs a new dynamic gate bias generator and a PAD voltage detector to provide appropriate gate biases. The design includes a new gate tracking circuit and a floating N-well circuit to avoid gate oxide reliability and leakage current, which relaxes the body effect at the output PMOS.