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1
Casadei, Erik. "Progetto di un convertitore full-bridge phase-shifted isolato a commutazione risonante." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10676/.
Full textAbstract:
L'evoluzione della tecnologia allo stato solido e il fiorire di nuove applicazioni determinano una forte spinta verso la miniaturizzazione dei convertitori elettronici di potenza.
Questa riduzione di pesi ed ingombri è particolarmente sentita anche in quei convertitori di media potenza che necessitano di un trasformatore d'isolamento. In quest'ambito assume importante rilievo l'utilizzo di una architettura circuitale a ponte intero e di tecniche in grado di spingere la frequenza di commutazione il più in alto possibile.
Questa tesi si propone quindi di studiare a fondo il funzionamento dei convertitori DC/DC isolati di tipo Full-Bridge e pilotati con la tecnica di modulazione Phase-Shifted che ben si presta all'impiego di commutazioni risonanti del tipo Zero-Voltage-Switching.
L'analisi teorica sarà corroborata da simulazioni condotte su LTspice e sarà orientata all'individuazione di una metodologia di progetto generale per questo tipo di convertitori.
Al fine di formalizzare meglio il progetto si è individuata una possibile applicazione nell'alimentazione di un DC-bus per telecomunicazioni (48 Volt DC sostenuti da batterie) a partire da una fonte di energia fotovoltaica quale una stringa di pannelli operanti con tensioni variabili da 120 a 180 Volt DC.
Per questo particolare tipo di applicazione in discesa può avere senso l'impiego di un rettificatore del tipo a duplicazione di corrente, che quindi si provvederà a studiare e ad implementare a secondario del trasformatore d'isolamento.
Infine particolare cura sarà dedicata alla parte di controllo che si ha intenzione di integrare all'interno di LTspice così da riuscire a simulare il comportamento dinamico del convertitore e verificare quanto predetto in via teorica mediante l'impiego della procedura che utilizza il K-Factor per la realizzazione della rete compensatrice.
2
Oshaben, Edward J. "DC-DC Power Converter Design for Application in Welding Power Source for the Retail Market." Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1296178360.
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3
Uslu, Mutlu. "Analysis, Design, And Implementation Of A 5 Kw Zero Voltage Switching Phase-shifted Full-bridge Dc/dc Converter Based Power Supply For Arc Welding Machines." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607873/index.pdf.
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Modern arc welding machines utilize controllable high frequency DC/DC power supply with high dynamic and steady state current regulation performance. In the design robustness, small size and low weight, low complexity, and high efficiency are the defining criteria. The most suitable approach for a 5 kW arc welding machine power supply application is the high frequency Full-Bridge Phase-Shifted Zero Voltage Switching (FB-PS-ZVS) DC/DC converter with an isolation transformer. This converter not only gives the advantage of zero voltage switching for a wide load current range, it also provides reduced Electromagnetic Interference (EMI) and reduced component stress compared to standard PWM converters. In this thesis a FB-PS-ZVS DC/DC converter with 5 kW power rating is designed for modern arc welding machine applications. IGBTs are utilized at 50 kHz switching frequency for high efficiency and control bandwidth. The output current of the DC/DC converter is controlled via a Digital Signal Processor (DSP) control platform. The performance of the designed DC/DC converter is evaluated via the computer simulations and the experimental study of the constructed prototype.
4
Pepa, Elton. "Adaptive Control of a Step-Up Full-Bridge DC-DC Converter for Variable Low Input Voltage Applications." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9722.
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This thesis shows the implementation of a novel control scheme DC-DC converter. The converter is a phase-shifted full-bridge PWM converter that is designed to operate as a front stage of a power conversion system where the input is a variable low voltage high current source. The converter is designed to step-up the low voltage input to an acceptable level that can be inverted to a 120/240 VAC 60Hz voltage for residential power. A DSP based adaptive control model is developed, taking into account line variations introduced by the input source while providing very good load dynamics for the converter in both discontinuous and continuous conduction modes. The adaptive controller is implemented using two voltage sensors that read the input and the output voltages of the converter. The controller's bandwidth is comparable to current mode control, without the need for an expensive current sensor, yet providing the noise immunity seen in voltage mode controllers. The intended input source was a fuel cell but in its absence a DC supply is utilized instead. The system is simulated for both discontinuous and continuous conduction modes and implemented and demonstrated for the continuous conduction mode. The test results are shown to match the simulation results very closely.Master of Science
5
Turriate, Victor Omar. "Design and Implementation of a Radiation Hardened GaN Based Isolated DC-DC Converter for Space Applications." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/98232.
Full textAbstract:
Power converters used in high reliability radiation hardened space applications trail their commercial counterparts in terms of power density and efficiency. This is due to the additional challenges that arise in the design of space rated power converters from the harsh environment they need to operate in, to the limited availability of space qualified components and field demonstrated power converter topologies. New radiation hardened Gallium Nitride (GaN) Field Effect Transistors (FETs) with their inherent radiation tolerance and superior performance over Silicon Power Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) are a promising alternative to improve power density and performance in space power converters.
This thesis presents the considerations and design of a practical implementation of the Phase Shifted Full Bridge DC-DC Isolated converter with synchronous rectification for space applications. Recently released radiation hardened GaN FETs were used in the Full Bridge and synchronous rectifier power stages. A survey outlining the benefits of new radiation hardened GaN FETs for space power applications compared to current radiation hardened power MOSFETs is included. In addition, this work presents the overall design process followed to design the DC-DC converter power stage, as well as a comprehensive power loss analysis.
Furthermore, this work includes details to implement a conventional hard-switched Full Bridge DC-DC converter for this application. An efficiency and component stress comparison was performed between the hard-switched Full Bridge design and the Phase Shifted Full Bridge DC-DC converter design. This comparison highlights the benefits of phase shift modulation (PSM) and zero voltage switching (ZVS) for GaN FET applications. Furthermore, different magnetic designs were characterized and compared for efficiency in both converters. The DC-DC converters implemented in this work regulate the output to a nominal 20 V, delivering 500 W from a nominal 100 V DC Bus input. Complete fault analysis and protection circuitry required for a space-qualified implementation is not addressed by this work.MS
6
PHAM, HIEU PHU, and HIEU PHU PHAM. "GaN Based 1MHz Phase Shifted Full Bridge Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/rba7t8.
Full textAbstract:
博士國立臺灣科技大學
電子工程系
106
The Power Supply Unit (PSU) for data center and telecommunication application typically handles from few hundreds Watt to few kilo Watts, that is composed of Power Factor Corrector (PFC) stage and frond-end DC-DC stage. For application such as telecommunication, the output voltage range is typically regulated at 48-60V from the 360- 400V input voltage source of PFC circuit. For high power application, the full bridge topologies, i.e. phase shifted full bridge (PSFB) converters are mostly used due to ability of carrying high current. The conventional PSFB converters have the drawbacks of narrow zero voltage switching (ZVS) operating range and high voltage stresses on the output rectifiers, which limit the operating of converter in MHertz switching frequencies. In this dissertation, the Tr-lead type PSFB converter employing two clamping diodes to overcome abovementioned issues is presented. The parasitic capacitor and reverse recovery characteristics of the output rectifiers that severely effect the performance of converter in high switching frequencies are discussed, together with the detailed analysis of both conventional and proposed converter. The solution of using enhanced mode Gallium Nitride wide band gap devices is introduced in order to overcome the drawback of Silicon based devices. Finally, a 480W 1MHz switching frequency prototype is built up and tested in laboratory. The experimental results show the ZVS achievement of switches in the wide range of load conditions, featuring the capability of operating in MHertz frequencies of this converter. The achieved peak efficiency of converter is up to 93% at full load condition
7
XIE, ZONG-XIAN, and 謝宗憲. "Implementation of Modular Phase-Shifted Full-Bridge Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/wueqpz.
Full textAbstract:
碩士國立雲林科技大學
電機工程系
106
A modular phase-shifted pulse-width modulation (PWM) full-bridge converter with magnetic-coupling current-balancing (MCCB) cell for high input voltage and high output current applications is presented in this thesis. In high input voltage applications, the primary side of the proposed converter consists of three full-bridge circuits connected in series, and utilizes three split capacitors to limit the voltage stress on each modular at one third of input voltage. The input voltage auto-balance ability is achieved by introducing two flying capacitors. Additionally, in order to ensure each module can share load, the MCCB cells are used to make both the input-current sharing (ICS) and the output-current sharing (OCS) among constituent modules auto-balance. The methods of voltage and current balance are simple, reliable and easy expansion. Moreover, they also save redundant components and complex control circuits compared to conventional converters. For the purpose of low output voltage and high output current applications, the secondary side of the propose converter is composed of three current doubler rectifiers connected in parallel. Due to the diode currents and the output inductors currents are half of output load in each module, it can reduce conduction loss and increase the efficiency. Hence it can suppress the current rating of the transformer secondary winding. Finally, the operation principle and design consideration of the proposed converter are discussed in detail. The proposed converter is verified via simulation and experiments. Experiments with a prototype under 750~800 V input and 24V/60A output are provided to verify the theory analysis.
8
Haung, Ching-hao, and 黃清豪. "Adjustable Phase-Shifted Full-Bridge Power Supply with Fully Digital Controller." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/35294343369567073143.
Full textAbstract:
碩士大同大學
電機工程學系(所)
101
In this thesis, a phase-shifted full-bridge power supply with continuously adjustable function by interpolating a fully digital controller is proposed. The proposed controller can stabilize the output voltage instead of fluctuant voltage using traditional controller while the output voltage is modulated in a wide range. In addition, the proposed system can achieve ZVS under various load conditions, and does not need to replace the component of controller. First, all the mathematical models of each operating state is derived, to obtain the corresponding relationship among the angle of phase-shifted, output voltage and output current. And then the complete design considerations are provided on detail. Next, the output voltage feedback control is conducted to achieve the preset output voltage by varying the angle of the phase-shifted according to the sampling output voltage and the parameters entered by the user interface, including the required voltage and current. Finally, the system efficiency is up to 92.4% at full load. The measured experiments are close to the simulation results under all test conditions, and the practical output voltage also coincides with the theoretical prediction.
9
Lin, Cyuan-Sin, and 林銓信. "Implementation of High-frequency Phase-shifted Full-bridge Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/82026118793143855058.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
105
A phase-shift full bridge converter with zero-voltage-switching (ZVS) features can reduce the switching losses. Thus, the conversion efficiency can be improved and the switching frequency can be raised. Since the studied converter is developed for high switching frequency operation, high-frequency core are used to realize power transformer, resonant and output inductors to prevent saturation. On the secondary side, Silicon Carbide (SiC) diodes are used to replace the conventional fast-recovery diodes for reduction of switching losses. In addition, the effects of the primary-side clamping diodes are analyzed and described. The operating principles and design considerations of the proposed converter are discussed in detail. A prototype phase-shifted full-bridge converter has been implemented and tested under input voltage of 285V, output voltage of 24V and output current of 8.5A. Theoretical analyses are verified with the experimental results.
10
Chien-ChihChen and 陳建智. "A Full-Bridge Phase-Shifted Inverter for Induction Heating." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/61123032480087062346.
Full textAbstract:
碩士國立成功大學
電機工程學系
102
The main purpose of this thesis is to study and implement a full-bridge phase-shifted load-parallel-resonant inverter for induction heating. Zero-voltage-switching operation of all switches can be achieved with stray components of the power transformer and four power switches. Parallel resonance occurs between the load and the resonant capacitor at a resonant frequency equal to the switching frequency, which results in maximum power transfer for induction heating. In this thesis, first, the basic theory of induction heating is introduced. Second, the analysis of operating principles of full-bridge phase-shifted load-parallel-resonant inverter is performed. Then, the design procedure is described. Finally, a prototype of the inverter with input voltage 500 Vdc, output voltage 50 Vrms,ac, and output power 2 kW is implemented to verify the theoretical analysis.
11
Lin, Shu-Yi, and 林書逸. "Integrated Magnetics Design on Full-Bridge Phase-Shifted Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4r7f9z.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
105
Full-bridge phase-shifted converter sometimes adds external resonant inductor to achieve zero-voltage switching during light load condition. The magnetic components in the circuit include resonant inductor, transformer and output inductor. However, these magnetic components occupy a lot of space in the circuit which cause low power density. The thesis analyzes the integration of magnetic component which integrate these three magnetic components into one core. To derive the flux density and output ripple current, the thesis calculates the DC flux, AC flux and equivalent inductance during operation interval. By adjusting the distance between primary side winding and secondary side winding, the leakage inductor can be used to replace the resonant inductor. Finally, a 500 W full-bridge phase-shifted converter with 380 V input voltage, and 12 V output voltage is implemented by using integrated magnetic technology. Therefore, the resonant inductor, transformer and output inductor can be integrated into one core which can decrease the number of magnetic components in the circuit.
12
Lin, Wang-Che, and 林汪哲. "Design of Full-Bridge Phase-Shifted Converter with Integrated Magnetics." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/78w747.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
105
In order to reduce the line power dissipation and wire stress, by adopted full-bridge phase-shifted converter with current doubler as rectification circuit in secondary side when converter’s output in a low voltage and high current condition. Compared with the conventional center-tap rectification circuit, the current doubler has more magnetics. This thesis proposes a new kind of current doubler structure with integrated magnetics to decrease the number of magnetics and prevent from the large leakage inductor which may cause large duty cycle loss. The proposed structure solves the problem of the large leakage inductance by changing winding method. The new structure also has the coupling inductor to reduce output current ripple, which has the same current rectification result compare to the conventional current doubler.
13
DU, YAN-KANG, and 杜彥慷. "Implementation of a Modular and Hybrid Phase-Shifted Full-Bridge Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/13039709016315067241.
Full textAbstract:
碩士國立雲林科技大學
電機工程系
104
A modular and hybrid phase-shifted full-bridge converter is proposed in this thesis for high input voltage and high output current applications. The proposed converter adopts three hybrid phase-shifted full-bridge converters connected in series. Each hybrid phase-shifted full-bridge converter consists of a traditional phase-shifted full-bridge converter and a half-bridge LLC resonant converter with sharing power switches of lagging leg, wider operating range of zero-voltage switching (ZVS) and fewer power switch counts. In order to overcome high input voltage application and reduce voltage stress of power switches, the input side of the proposed converter connects three hybrid phase-shifted full-bridge converters with three input capacitors in series, and two flying capacitors are used to make the voltage of three input capacitors automatically balance. Moreover, the output side of the half-bridge LLC resonant converter and the rectifier side of the phase-shifted full-bridge converter are connected in parallel with an auxiliary voltage diode which provides a positive rectified voltage instead of zero voltage on the rectifier side of the phase-shifted full-bridge converter during the circulating phases, then the circulating current loss of the primary side of the traditional phase-shifted full-bridge converter is reduced. Finally, a detailed circuit analysis and the feasibility of the proposed converter are conducted through simulation software, the experiments implement with 750-800 VDC input voltage, 24 VDC output voltage, 75 A output load current and 1.8 kW rated power.
14
Huang, Kuan-Pin, and 黃冠斌. "Phase-shifted Full-bridge Converter using Current Doubler for Battery Charging." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/87461939608831600944.
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碩士中原大學
電機工程研究所
104
This thesis aims to develop a 1-kW phase-shift full-bridge converter with a toroid-core-wound autotransformer designed current doubler rectifier as a battery charger. Comparing with the use of single inductor rectifier, the valid duty of the converter can be extended because of the smaller transition period. Using constant current mode as our battery charging method, by adjusting the phase shift of the control signal we are able to maintain constant current through the whole charging period. The converter acts close to zero-current switching (ZCS) at light load and keeps the zero-voltage switching (ZVS) at heavy load, which allows the converter work in high efficiency. In this study, the controller UC3875 is employed to provide the phase-shift signals for stabilizing the output current constant. The specification of the converter is 380V input and 48V output. A 1-kW converter is implemented to verify the estimation results. A set of 48V lead-acid battery was charged by the converter with constant current of 20A, and it proves that the efficiencty under 1 kW output power was over 90%.
15
Lin, Bing-Jyun, and 林秉均. "Adjustable Phase-Shifted Full-Bridge High Voltage DC Power Supply with Fully Digital Controller." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/ftj3mr.
Full textAbstract:
碩士大同大學
電機工程學系(所)
102
An adjustable phase-shifted full-bridge high voltage dc power supply with fully digital controller is proposed in this paper. The proposed controller consists of a user interface control and a phase-shifted full-bridge control. By varying the phase-shifted angle calculated from the parameters entered in the user interface and the sampling output voltage, the output voltage is equal to the preset output voltage. In addition, the proposed system can achieve ZVS under various load conditions to reduce power loss. Next, a multi-range sampling circuit is proposed in this paper. This circuit can increase the precision of the output voltage and indirectly improve the ADC resolution while the output voltage is modulated in a wide range. Finally, the system efficiency is up to 94.2% at full load. In addition, the output voltage is close to the preset output voltage under various load conditions, and the voltage deviation is 0.005% ~ 0.49%
16
Chen, Hui-Ru, and 陳慧茹. "Implementation of Modular Phase-Shifted Full-Bridge Converter with Less Circulating Current." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/06141759245839428520.
Full textAbstract:
碩士國立雲林科技大學
電機工程系
104
This thesis presents a novel modular phase-shifted full bridge converter with low circulating current and low power switching loss for high power DC/DC converter and high input voltage applications. The proposed converter includes three circuit cells in series and each circuit cell integrates a full-bridge converter and a half-bridge converter with shared power switches in lagging leg to have the advantages of wide zero-voltage switching (ZVS) range and less switch counts. Due to the series connection of the full-bridge converters and the flying capacitors, the input capacitor voltage imbalance problem can be overcome. The transformer secondary side of the full-bridge converter and the half-bridge converter are connected in series to reduce the voltage stress of rectifier diodes and reduce the primary circulating current. Therefore, the proposed converter can solve the drawbacks of the conventional phase-shifted full-bridge converters, such as large circulating current, narrow ZVS range, large conduction losses, large duty-cycle loss, high voltage stresses of rectifier diodes and large output inductor value. Finally, this thesis accomplishes a modular phase-shifted full-bridge converter with less circulating current. This study conducted a thorough circuit operation and design considerations. Experiments are presented for a 1.8 kW prototype circuit converting 750-800 VDC input to an output voltage 24 VDC/75 A. Experimental results show that the maximum efficiency is higher than 90%. These measured results verify the theoretical analysis, design consideration and circuit implementation.
17
DAI, JHENG-JIE, and 戴正杰. "Implementation of Phase-Shifted Full-Bridge Converter with High Input Voltage Application." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ykgpt6.
Full textAbstract:
碩士國立雲林科技大學
電機工程系
105
This thesis proposes a phase-shifted pulse-width modulation (PWM) full-bridge converter for high input voltage applications. The proposed circuit is based on the full-bridge converter with input-series-output-parallel-connected single transformer. The primary side of the proposed converter consists of two full-bridge circuits connected in series. The series-connected full-bridge circuits are effective to reduce voltage stress of power switches. However, the split capacitor voltages cannot be ensured to be balanced. In order to overcome the split capacitors voltage unbalance problem, a flying capacitor is used to improve this problem without using additional components or complex control loops in the conventional control scheme. The secondary side of the proposed converter consists of a center-tapped rectifier to reduce the number of power diodes and magnetic components compared to the traditional circuits using two center-tapped rectifiers. Finally, the circuit analysis and component design are conducted through simulation and experimental results to verify the validity of the proposed converter. The input voltage ranges of the experimental circuit are from 750V to 800V, the output voltage is 48V, the load current is 21A, and the output power is 1000W.
18
Hong-Ching, Hu, and 胡宏慶. "Study and Implementation of Full-Bridge Phase-Shifted Zero-Voltage-Switching Converter." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/19365165856211500637.
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碩士國立成功大學
電機工程學系
88
The power density of the traditional switching power supply is limited by the switching frequency, since high switching frequency are accompanied by high switching losses and serious electromagnetic interference. These defects can be improved by soft switching technique. This thesis uses the phase-shifted PWM controller IC and utilizes MOSFET junction capacitance and additional inductance to achieve zero-voltage resonant switching. Finally, a 400W experimental prototype is constructed to verify the theoretic analysis and the feasibility of zero-voltage-switching technique.
19
Cheng, Han-Yi, and 鄭漢義. "Study on a Phase-Shifted Full-Bridge Converter with Constant-Current Output." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/q34399.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
105
The objective of this thesis is to design and implement the full-bridge phase-shift converter for high current output. The control strategy is designed to be capable of constant voltage (CV) mode and constant current (CC) mode. Finally, IC UCC28950 as pulse-shift modulation controller, using phase shift modulation signal to control duty cycle, the zero-voltage switching (ZVS) features can effectively reduce the switching losses and raise conversion efficiency. Finally, in order to consider the high current load, to solve the difficulty of selecting suitable components and the heat dissipation problems, a design example of 600 W power converter with 24 V input voltage and 0-10 V output voltage and full load current 60 A is implemented and tested. Using a single group in parallel into multiple groups, to achieve the maximum output current of 300 A, the maximum power of 3 kW converter. Experimental results show that the maximum efficiency is 82.4%.
20
Lin, Cheng-Ying, and 林承盈. "Development of Switching Mode Control Technique for Phase-shifted Full-bridge Converters." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/prjr5p.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
104
Phase shifted full bridge (PSFB) converters are widely used in medium to high power applications like server or telecom power supplies because it can achieve zero-voltage switching (ZVS) without requiring auxiliary circuits. The advantages of PSFB converter include high efficiency, low voltage and current stress on power devices, and fixed-frequency control. However, the PSFB converter suffers drawbacks such as narrow ZVS range for the lagging leg and large circulating current. On the other hand, operating a full bridge (FB) converter with asymmetrical pule-width modulation (APWM) can eliminate switching losses without increasing conduction losses. Using the APWM strategy, circulating currents that exists in a traditional PSFB converter can also eliminated. Nonetheless, APWM FB converter has some drawbacks such as limited maximum duty cycle and narrow ZVS range. In this thesis, a novel switching control technique for FB converter is proposed. The presented system changes the operating mode of the FB converter according to load conditions. For very light load, burst mode control is employed. Next, phase shifted control is used under light-to-medium load conditions and APWM control is chosen for heavy load condition. To further improve the efficiency, adaptive dead time techniques for PSFB and APWM are also derived and applied. In this thesis, the operating principles, design guidelines will be described first. A low cost digital signal controller dsPIC33FJ16GS502 is then adopted in this thesis to realize the proposed switching control. To validate the correctness and the effectiveness of the proposed method, a 480 W, 24V to 20A prototyping circuit is implemented and tested. According to the experimental results, the proposed switching control technique can improve the efficiency by 2 % ~ 3% comparing with conventional PSFB converter.
21
WU, GUAN-YI, and 吳冠毅. "Implementation of Modular Phase-Shifted Full-Bridge Converter with Low Circulating Current." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9g7s9x.
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碩士國立雲林科技大學
電機工程系
106
A modular phase-shifted full-bridge converter with less circulating current is proposed in this thesis for high input voltage and high output current applications. The proposed converter adopts two modular phase-shifted full-bridge converters connected in series. Each modular phase-shifted full-bridge converter consists of a traditional phase-shifted full-bridge converter and a half-bridge LLC resonant converter with sharing power switches of lagging leg to achieve wider operating range of zero-voltage switching (ZVS) and reduce power switch counts. Since the series-connected full-bridge converters are connected with a flywheel capacitor to solve input split voltage unbalanced problem. In the secondary side, a passive snubber circuit is used to produce a positive rectified voltage for reduce the primary current to zero during the freewheeling state. Finally, a detailed circuit analysis and the feasibility of the proposed converter are conducted through simulation results,and experiments with 750-800 VDC input voltage, 48 VDC output voltage, 35 A output load current and 1.68 kW rated power.
22
Tsai, Cheng-Hsun, and 蔡承勳. "Realization of a Phase-Shifted Full-Bridge DC-DC Converter with Integrated Magnetics." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/cwyuxx.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
105
This thesis is concerned with the realization of a phase-shifted full-bridge dc-dc converter with Integrated Magnetics. A phase-shifted full-bridge converter with zero-voltage switching can be effectively improved. The geometric structure of magnetic materials is used to integrated transformers and inductors of phase-shifted full-bridge dc-dc power converters into a single magnetic component to reduce size and height. The thesis presents the design and implementation of the phase-shifted full-bridge dc-dc converter with integrated transformer and inductor as the control circuits. Finally, a 360 W laboratory prototype for phase-shifted full-bridge dc-dc converter with specification of 400 V input voltage, 12 V output voltage and 30 A output current was implemented.
23
Cheng, Chuang Chei, and 莊志成. "The Realization Study of Modular Phase-Shifted Zero-Voltage-Switching Full-Bridge Converter." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/79644474761723795900.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
87
Abstract This thesis presents a strategy for realizing a medium-power module AC/DC converter by zero-voltage-switching pulse-width modulation (ZVS-PWM) technique. A full-bridge topology is employed and a voltage-mode control is adopted to acquire good voltage regulation. The valid duty and the sub-duty intervals in the full-bridge loop are exactly estimated. The complete primary current profile with respect to each transition interval of the phase-shift process is derived and modeled. A master-slave active current sharing technique is used as the modulus parallel strategy in the design. A complete small-signal flow chart and inner transfer function of the master and slave module converter is derived. A design example for simulating and realizing a power supply with 4+1 modules of total power 3.75kW (single module’s output is 24V~30V/25A) FB-PS-ZVS-PWM converter including output voltage adjustment and parallel load current sharing is conducted to assess the system performance and to verify the theoretical predictions.
24
Ke, Yu-kuan, and 柯育寬. "A Control IC for Full-Bridge Phase-Shifted Series-Resonant DC-DC Converters." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/69695734051295298171.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
98
This thesis focuses on the design of a power control IC for the full-bridge series resonant DC / DC converters. The proposed control strategy combines the characteristics of the full-bridge series resonant converter and full-bridge phase-shifted converter. At heavy load condition, high efficiency performance can be achieved by the studied series resonant converter with zero-voltage-switching features. The phase-shifted operation is used to improve the efficiency performance at light load condition. An external circuit is added into the feedback loop for generating the gating signals. The switching frequency can be modulated at heavy load condition while the phase-shifted gating signals are regulated at light load condition. During the transition between two operating modes, a hysteretic mechanism is adopted to avoid the unstable issue. The simulation analysis of the designed control IC is verified for process and temperature variations. The switching frequency can be adjusted from 20 kHz to 300 kHz by an external component. The chip area is 2.14 mm2. The compact size is very suitable for high power density applications.
25
Tzeng, Shuh-Horng, and 曾恕宏. "Realization study of phase-shifted Full-Bridge converter by zero-voltage-switching technique." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/23436012816655362674.
Full textAbstract:
碩士國立台灣工業技術學院
電子工程技術研究所
85
This thesis proposes a realization of zero-voltage-switching (ZVS) full-bridge (FB) converter by phase-shift pulse-width modulation (PS-PWM) technique. The working principle of the ZVS- FB-PS and its large-signal analysis are clearly conducted. We find that there exist two resonant periods during the ZVS processes, which contribute exact estimation of the switching frequency for the ZVS-PWM FB converter. Besides, a small-signal model is also established for analyzing and compensating the converter. Finally, a design example of 600W ZVS-PWM FB converter is conducted to assess the system performance. The experiment and simulation results are close to each other.
26
Li, Bing-Ze, and 李秉澤. "The Implementation of A Full-Bridge Phase-Shifted Zero-Voltage-Switching Power Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/11429511164354830053.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系博碩士班
96
A zero-voltage switching DC/DC converter with the high circuit efficiency is presented in this thesis. The structure of a full-bridge converter with the phase-shift PWM is used to achieve the zero-voltage switching in the transformer primary side. The constant frequency PWM with the resonant of the zero-voltage switching provides the high frequency at the high switching frequency. In order to increase the converter efficiency in the transformer secondary side, a current doublers rectifier, low current ripple, and synchronized rectifier circuits are also adopted. The detail circuit operation and mathematical analysis are presented in this thesis. The measured efficiency on the prototype, a DC/DC converter 200V/24V with 6A output current, is higher than 88%.
27
Tsai, Ying-ming, and 蔡英銘. "Design and Implementation of Interleaved Phase-Shifted Full Bridge Converter with Synchronous Rectifiers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/75214161233176058150.
Full textAbstract:
碩士國立雲林科技大學
電機工程系碩士班
101
This thesis will design and implement an interleaved phase-shifted full bridge converter with synchronous rectifiers, for high-power DC / DC converter with low voltage input applications. In this thesis, the phase-shifted PWM IC (UCC3895) is adopted to regulate the output voltage. The resonant inductance and the output capacitance of MOSFETs will resonant be turned on at ZVS (Zero Voltage Switching) to reduce the switching loss. In order to reducing the conduction loss of rectifier diodes, the synchronous rectifiers are used at the secondary side. The interleaved PWM scheme is also used to reduce the output ripple current. The operation principle and design consideration of the proposed converter are discussed in detail. Finally, a 600W prototype (input 36~75Vdc, output 12V/50A, switching frequency 150 kHz) are implemented to verify the performance of the proposed converter.
28
Hsiao, Tung-yuan, and 蕭棟元. "Implementation of A Dual Full-Bridge Phase-Shifted Converter with High Input Voltage." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/20278426382966788443.
Full textAbstract:
碩士國立雲林科技大學
電機工程系碩士班
101
The research and implementation of a dual full-bridge converter with high input voltage applications are provided in this thesis. The features of the proposed converter are high input voltage, balanced input capacitor voltages and zero voltage switching (ZVS) turn-on for all active switches for achieving higher power density. In order to use in high input voltage applications, dual full-bridge converters connected in series and two split capacitors are used to limit the voltage stress of each power switch at one half of input voltage. The bypass capacitors are used to balance the input capacitor voltages. Finally, the simulation and measured results are presented to confirm the effectiveness of the proposed converter.
29
Chou, Yu-Teng, and 周宥騰. "Analysis and Realization of Phase-shifted Full-bridge Converter with Current-Doubler Filter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/qg968h.
Full textAbstract:
碩士中原大學
電機工程研究所
106
This thesis studies a 1 kW phase-shifted full-bridge converter with a current-doubler rectifier (CDR) for a battery charger. This CDR formed by two identical inductors is to reduce the ripple voltage and the cost of output capacitors. Using constant current mode as our battery charging method, we can maintain constant current through the whole charging period by adjusting the phase-shift of the control signal. The converter acts the zero-voltage switching (ZVS) between middle to heavy loads, which certainly maintains high efficiency in the range. In this study, the controller UC3875 is employed to stabilize the output current constant by changing the duty cycle. The specification of the converter is 380V input and 48V output. The converter with constant current of 20A charged a set of 48V lead-acid battery and over 90% efficiency is attained under the output power of 1 kW.
30
HSIEH, TIEN-YU, and 謝典佑. "Comparison of Power Loss of Planar Transformers for Phase-Shifted Full-Bridge Converters." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/67j5s6.
Full textAbstract:
碩士國立臺北科技大學
電機工程系電力電子產業碩士專班
107
The purpose of this thesis is to investigate the loss of the planar transformer which is used for phase-shifted full-bridge converter. Using ANSYS Maxwell simulation software, the leakage inductance, winding loss and core loss of the transformer with six different types are analyzed. The simulation results show that the total loss of the planar transformer with a turn ratio of 2：2 is 3.33 W, and the total loss of the interleaved winding of 3：3 is 11.38 W. The experimental results show that the phase-shifted full-bridge converter using sandwich 2：2 is 83.47 % at 60% load and the highest efficiency is 85.50 % at full load.
31
Hsu, Tsen, and 許涔. "Design of Active Snubber for Synchronous Rectification MOSFET of Full-Bridge Phase-Shifted Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/51543643377230836274.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
105
Full-bridge phase-shift converter has the merit of zero-voltage switching (ZVS) which can reduce the switching loss and the high frequency noise interference. However, there will be voltage spike induced on the secondary side synchronous rectification MOSEFTs. This thesis presents the study upon an active snubber circuit which is designed to reduce the spike. This active snubber is compared with the well-known RC and RCD passive snubbers. The stray energy on the secondary-side is restored to the snubber capacitors, then the snubber transfers the stored energy back to the primary-side. Due to the energy retrieval, the active snubber circuit surpasses the passive counterpart on energy efficiency. Besides, the voltage stress on the synchronous rectification MOSFETs is lowered benefited from the spike reduction; the MOSFET conduction resistance i.e. the conduction loss can also be reduced. That is, the power efficiency is further improved by the application of the active snubber.
32
Ho, Su-Hau, and 何書豪. "The Implementation of a Full-Bridge Phase-Shifted Zero-Voltage-Switching DC Power Supply." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/23685615755984128095.
Full textAbstract:
碩士國立雲林科技大學
電機工程系碩士班
93
With the development of power electronic technology and integrated circuits, the Switching Mode Power Supply has substituted for the traditional Linear Mode Power Supply. The development of industrial product is toward to small size, low weight, high efficiency and low price. In the modern high technology and the complicate electronic system, it needs more reliable and efficient DC power supply to maintain the system operation. Full bridge phase shifted zero voltage transition PWM Switching Mode Power Supply completely meets the above requirements. This technology can reduce the voltage stress of power semiconductors, decrease the redundant heat dramatically and raise the power transition. The operating frequency of the system can be higher than 20kHz, so it makes the size of magnetic elements smaller. Pulse width modulation with fixed frequency possesses compact circuits and well steady output voltage. To summarize above points, full bridge phase shifted, zero voltage transition PWM Switching Mode Power Supply indeed fit the requirement of the direct voltage source in industrial systems nowadays. The categories of DC power supply, the advantage and the shortage of assorted circuits, the basic theory, circuits activities, PWM controlled ICs and control circuits are first discussed in this thesis. Next, the designed analysis, theory operation conditions of phase shifted zero voltage switching of full bridge phase shifted, zero voltage transition are described and discussed in this thesis
33
Huang, Sheng-Wen, and 黃聖文. "Full-Bridge Phase-Shifted Driving Circuit with Current Balancing for Cold Cathode Fluorescent Lamps." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/60347512312022012851.
Full textAbstract:
碩士國立臺灣大學
電子工程學研究所
95
The aim of this thesis is to study and implement a full-bridge phase-shifted driving circuit with current balancing for cold cathode fluorescent lamps. Because the impedance of each lamp in a traditional multi-lamp system is not necessarily the same, the current through each lamp would be dramatically different. Therefore, the brightness of the system is not uniformly distributed. The aim of this thesis is to utilize balancing transformers to reduce the current differences between each lamp such that the brightness of each lamp maintains uniform. The circuit architecture in the thesis is full-bridge phase-shifted inverter. It utilizes full-bridge phase-shifted pulse width modulation to achieve zero voltage switching and reduce the switching loss. In the end, a driving circuit for cold cathode fluorescent lamp is demonstrated and the experimental results can verify the theoretical analysis.
34
Hsieh, Ming-tsung, and 謝明琮. "Design and Implementation of Full-Bridge Phase-Shifted Series-Resonant DC-DC Converters for Full-Range Load Variations." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/19978084618228547312.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
95
This thesis focuses on the design and control of a phase-shifted full-bridge series resonant converter (PS-FB-SRC). The basic operating principles and state analysis of the proposed converter are discussed in detail. The output voltage of a series resonant converter is difficult to be well-regulated at light-load conditions since the switching frequency cannot be increased beyond the designated maximum frequency. In this thesis, the phase-shifted pulse width modulation (PWM) is used to reduce the effective duty cycle and confine the output voltage in a regulated range at light loads and even no load. The relationship among voltage gain, switching frequency and effective duty cycle are discussed and analyzed. The proposed full-bridge phase-shift series resonant converter features a novel two-mode operation. That is, it is operated in series resonant mode during heavy loads and in phase-shifted PWM mode during light loads. Both operating modes achieve zero voltage switching during dead times. Therefore, the proposed converter exhibits high conversion efficiency for wide-range load conditions. Finally, a 48V/42A single-output FB-PS-SRC is implemented. Experiments are conducted to verify the theoretical analysis.
35
楊岳霖. "Full-bridge phase-shifted zero-voltage and zero-current-switching converter using transformer auxiliary winding." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/16513832659936854844.
Full text
36
Lai, Yu-Peng, and 賴昱芃. "Design and Implementation of a Full-Bridge Phase-Shifted Inverter for an Induction Heating System." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/2uxxg2.
Full text
37
Tseng, Jerry, and 曾成德. "Investigation of Zero-Voltage-Switching characteristics of Phase-Shifted Full Bridge with Current Doubler circuit." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/76027638949613584596.
Full textAbstract:
碩士國立臺灣大學
電機工程學研究所
94
The phase-shift full-bridge converter with current-doubler circuit in the output is often used in medium- power high-current low-output voltage applications. The research reported in this thesis is to investigate the soft-switching characteristics of the main switches. It’s well known that the main switches in the “leading leg” can be zero-voltage turned on without much of a problem, but not necessary so for those in the “lagging leg”. The focus of the thesis is to investigate the conditions affecting the zero-voltage turn on of the main switches of the lagging leg. In the thesis, equations will be derived to show mathematically how the converter design and the operating condition affect the ZVS switching. Software simulations were run to confirm the conditions derived. A comparison was also made between the current doubler secondary circuit and the center-tapped secondary circuit working in conjunction with the phase-shifted primary was made. It’s found out that although the magnetizing inductance never gets involved in the resonance to achieve ZVS, the magnetizing current indirectly affect the primary current which plays a dominant role in determining if ZVS can be achieved. It’s also found out that current doubler circuits, compared to the center-tapped circuit, make it easier to achieving ZVS condition even at light-load condition. This is because the current in the output chokes in the current doubler always operates in the continuous mode even at light-load condition, unlike that of the center-tapped counter part. Therefore, the conduction duty cycle stays about the same for the full range of load which causes a larger magnetizing current and makes it easier to achieve ZVS condition at light load. The information obtained in the thesis is valuable for designing such a converter for high efficiency.
38
Zhou, Shu-ren, and 周書任. "High Output Voltage of DC/DC Converter Based on Full-Bridge Phase-Shifted Series-Resonant." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/82478635002176790435.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
96
In this thesis, high voltage and high power converter is studied. This high power converter consists of the full bridge converter, LC series resonant circuit and double voltage circuit, use phase-shifted, fixed frequency, and high voltage is completed. In this paper has detail converter principle and modeling in mathematics to provide complete design and analysis. Finally, design a 100kV/10mA~30mA circuit and complete proof of open loop system.
39
ZHANG, SHENG-ZHI, and 張勝智. "Implementation of Modular Phase-Shifted Full-Bridge Converter with High Input Voltage and High Output Current." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/38021416464510241076.
Full textAbstract:
碩士國立雲林科技大學
電機工程系
104
A series modular phase-shifted pulse-width modulation (PWM) full-bridge converter for high input voltage and high output current is proposed in this thesis. The proposed converter features high input voltage, high output current, auto-balance input capacitor voltage and modular design. In order to reduce the voltage stress on the power switches in case of high input voltage, three full-bridge converters on primary side are connected in series and three split capacitors are used to limit the voltage stress on each modular at one third of input voltage to prevent switches from being damaged. Additionally, the flying capacitors are introduced to balance input split capacitor voltages so that all modules can be achieved to balance input voltage. The number of the series modules can be flexible which depend on the input voltage, thus lower level of power switches can be used at high input voltage application. On the secondary side, the proposed converter employs the current doubler rectifiers for the applications of low voltage and high current output. Besides, the output terminals of the three sets of current doubler rectifier are connected in parallel so that the output current is equally distributed. Finally, a laboratory circuit is provided to confirm the performance of the proposed converter.
40
Hsieh, Hung-I., and 謝宏毅. "REALIZATION OF TRANSITION AND OUTPUT INDUCTORS FOR PHASE-SHIFTED ZERO-VOLTAGE-SWITCHING PWM FULL-BRIDGE CONVERTER." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/50672515152459606413.
Full textAbstract:
碩士國立交通大學
電機與控制工程系
90
This thesis proposes a new description of the phase-shifted zero-voltage-switching pulse-width modulated full-bridge (PS-ZVS-PWM FB) converter, in particular for the turns-ratio greater than one. Five dynamic conversion models are introduced, including energy-delivery state, first resonant state, energy-holding state, second resonant state, and energy-transition state etc. Interestingly, the transition inductor is only dominant in energy-transition period and the other four dynamics are mainly subject to the output inductor when the turns-ratio of the main transformer is greater than one. Both two resonant states are dependent on the resonant inductance and the power MOSFETs’ output capacitances. Besides, a 3-D dynamic-energy distribution for describing the energy in the resonant inductor versus the primary current is explored, which is as reference to achieving ZVS at the power switches. According to the theoretical derivation, we suggest a design consideration for selecting the and in system realization. Finally, a simulation by MATLAB is implemented for verifying the theoretical description. A 1-KW PS-ZVS-PWM FB converter is realized with the derived parameters and examined with versatile loads to assess the system performance, which is quite the same as the predicted dynamics.
41
Chen, Yung-Lin, and 陳泳麟. "A Full-Bridge Phase-Shifted Series-Resonant Converter with Constant-Voltage and Constant-Current Output Modes." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/29663240131505167978.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
102
This thesis focuses on design and control of a phase-shifted full-bridge series-resonant converter (PS-FB SRC) with dual constant current/constant voltage output modes. Based on the FB SRC, the features of the PS FB converter are combined to solve two problems. The output voltage of an SRC is loosely-regulated at light-load conditions since the switching frequency cannot be increased beyond the designated highest frequency. Moreover, the resonant inductor temperature is high because of the high switching frequency at constant current output control mode. The operating principles and equivalent circuits under various modes of the presented converter are analyzed in detail. A new integrated control strategy is proposed by combining the pulse phase modulation (PPM) and pulse frequency modulation (PFM). Finally, a 750 W (12 V/62.5 A) PS-FB SRC with constant-current and constant-voltage control modes is implemented to verify the feasibilities of the theoretical analysis and the control functions.
42
SHEN, JHENG-FONG, and 沈政峰. "Implementation of a Phase-Shifted Full-Bridge Converter with Synchronous Current-Doubler Rectifier for Full-Load Range Zero-Voltage-Switching." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9u6efs.
Full textAbstract:
碩士南臺科技大學
電機工程系
104
This paper proposed a phase-shifted full-bridge converter with synchronous current-doubler rectifier DC-DC for full-load range zero-voltage-switching (ZVS), the proposed converter only uses synchronous rectifier to replace rectifier diodes in the secondary side of the phase-shifted full-bridge with current-doubler rectifier, and just adopted a simple logic circuit to derive the signal for driving the synchronous rectifier and do not need to add the complicated auxiliary circuit, can achieve the advantages of both the synchronous rectifier and full-load range zero-voltage-switching (ZVS), can reduce electromagnetic interference (EMI) and increase efficiency of the converter. The operation mode of the converter based on full load to extremely light load is divided into positive continuous conduction mode (PCCM), positive boundary conduction mode (PBCM), negative continuous conduction mode (NCCM), and negative boundary conduction mode (NBCM). According to the analysis of the four modes of operation theoretical, the relationship between the major switches of the full-bridge for full-load range and each circuit component parameters of the converter are discussed. Finally, a prototype of full-load range ZVS phase-shifted full-bridge with synchronous current-doubler rectifier DC-DC converter with an input voltage of 200V, output voltage of 12V, and output power of 250W is developed to verify the correctness and feasibility of this analysis of the four operation modes.
43
莊曜全. "Design and Implementation of a Full-Bridge Phase-Shifted ZVS DC Power Supply with Power-Factor-Correction." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/62296164555372617485.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
90
The purpose of this thesis is to design a full-bridge phase-shift zero voltage switching (FB-PS-ZVS) DC/DC converter with power factor correction (PFC). The system includes an EMI filter, a power factor corrector and a DC/DC converter. The EMI filter can solve conducting wire noise from power-switches, transformers and power-diodes during the switching process. The power factor corrector derives high-power-factor for the best power quality. The FB-PS-ZVS DC/DC converter can effectively reduce noise and loss in switching process and enhance higher system efficiency. The thesis not only describes the system circuit principle but also verifies the theory by PSpice and IsSpice. Finally, a 1kW DC/DC power supply is implemented to conform to the standard of EMI and power factor.
44
Rawat, Shubham. "A Novel Passive Regenerative Snubber for the Phase-Shifted Full-Bridge Converter: Analysis, Design and Experimental Verification." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5874.
Full textAbstract:
The development of Wide Bandgap (WBG) devices has enabled power electronic converters
to operate at much higher frequencies, voltages and high power. Working at a higher
switching frequency minimises the size of magnetics but results in significant switching
losses and electromagnetic interference (EMI) noise. Thus, it necessitates the use of soft-switching
techniques to reduce these losses. Phase-Shifted Full-Bridge (PSFB) Converter
is the most widely used soft-switching topology in the high-voltage and high-power, unidirectional,
DC-DC conversion. The phase shift PWM control utilises the converter parasitics
to achieve zero voltage switching (ZVS) turn ON. The gating technique allows the
magnetic energy stored in the leakage inductance of the isolation transformer to charge
and discharge the output capacitances of the inverter leg. However, the converter suffers
from severe voltage overshoots across the rectifier bridge during the zero to the active state
transition. The resonant circuit formed between the transformer leakage inductance and
the parasitic diode capacitance of the rectifier is responsible for the high-voltage ringing.
Many passive and active snubbers are presented in the literature to mitigate the high-voltage
overshoots across the diode bridge. While passive snubbers are relatively simple
to implement than active snubbers, they are lossy. On the other hand, the active snubbers
require additional gate driver circuitry and complex control.
The first part of the thesis proposes a novel passive regenerative snubber to overcome
the mentioned drawbacks of the existing snubbers. The proposed snubber is ideally lossless
with no control complexity. The work covers a detailed analysis of the PSFB operation
with the proposed snubber while obtaining closed-form expressions for the converter state
variables at the end of each topological stage. The study considers all the major converter
parasitics, such as transformer leakage and magnetising inductances, and parasitic capacitances
of the converter. Given the new snubber, the thesis also lays out a step-by-step
PSFB design procedure utilising the analysis carried out in the first part of the work. The
design aimed to develop a 100 kHz PSFB for an input voltage of 360-440 V in the output
power range of 0.5-1.5 kW at a fixed output voltage of 48 V. The design approach focuses
on two design objectives - All inverter switches must achieve ZVS turn ON and the
desired converter gain for all possible operating conditions.
A hardware prototype is built and tested. The experimental results validate the effectiveness
of the snubber in reducing the voltage overshoot. Further, the analysis and design
accuracy is verified using the measured state variables. The work, at last, presents the
overall converter efficiency and the loss distribution among the converter components.
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Wu, Yao-wei, and 吳耀偉. "Novel Phase-Shift Full-Bridge Converterwith Voltage Doubler Rectifier." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/9t6v45.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
103
A phase-shift full-bridge converter with voltage double rectifier (PSFB-VD) is investigated. In addition to having low voltage and current stresses on the MOSFET switching device, soft switching operations can be achieved on the switching devices, such as zero-voltage switching on MOSFETs and zero-current switching on rectifier diodes. Due to its inductorless output filter, moreover, the voltage stress of rectifier diodes is thus clamped to the output voltage. Employing the voltage doubler rectifier, a smaller transformer turns-ratio can be used. Furthermore, the PSFB-VD converter has wide range ZVS operation, no duty cycle loss, lower circulating loss, and significantly reduced output voltage ripple. Another voltage doubler type rectifier, a Taiwan Tech voltage doubler rectifier is employed to integrate the phase-shift full-bridge converter (PSFB-TVD) in this thesis. The PSFB-TVD has a built-in second order filter formed by utilizing the leakage inductance and clamping capacitor to perform a voltage ripple cancellation mechanism with small clamping capacitor. In addition to the descriptions of the operation principle, theoretical analysis, and design considerations, two hardware circuits, the PSFB-VD, the PSFB-TVD, with 300-400-V input and 200 V/450 W output specification are built and tested.
46
Sae-Foeng, Pitipong, and 馮恩福. "Low Input Current Ripple Phase-Shift Full-Bridge Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/77513659879876754803.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
100
The phase-shift full-bridge converter (PSFB) is widely used for the front-end dc-dc converter due to its essential advantages in low voltage and current stresses on the switches, high efficiency and fixed frequency operation. Moreover, it has several features, for instance, the incorporation of the leakage inductance of the transformer to achieve zero-voltage switching (ZVS) of the primary switches and the elimination of the need for the primary side snubbers enables it suitable for high input voltage and high power conversion applications. Several papers have been published to provide the solutions for the main criteria, such as the ZVS range, dead time, and duty cycle loss, in the design trade-off of the PSFB. Inheriting from the characteristic of the Buck converter, however, large di/dt noise is generated due to its pulsating input current waveform. To meet the EMI regulation, therefore, a larger EMI filter has to be added and becomes the only solution so far. To alleviate the input current, di/dt, recently, several input current ripple reduction converters have been proposed in the literature. As a result, the EMI performance can be achieved by using smaller EMI filter components. It reduces the size and saves the cost from the conventional EMI filter design. However, these converters suffer from the high switching loss due to the hard-switching operation. Therefore, zero-voltage switching technique should be applied to enhance their performance. To explore a full-bridge converter with ZVS and reduced input current ripple properties becomes the motivation of this research and a phase-shift full-bridge with input ripple reduction converter (PSFBRR) is proposed. In addition to meet the EMI regulation with smaller filter components, the significant efficiency improvements can be achieved. Including the ZVS range, dead time, and duty cycle loss, the issue of the input current ripple of the proposed PSFBRR is accompanied to be discussed in detail. Moreover, the input current ripple can be further reduced by way of the current ripple cancellation mechanism. Thus, a phase-shift full-bridge converter with input ripple cancellation (PSFBRC) is also proposed to obtain a continuous input current waveform instead of the pulsating shape. To demonstrate its feasibility, the operation principle and the hardware implementations of the proposed converters with 300~380V input and 12V/30A output are described in this thesis.
47
Chen, Lian-Shen, and 陳廉燊. "Design and Implementation of Phase-Shift Full-Bridge Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ec5ss5.
Full textAbstract:
碩士國立臺北科技大學
電力電子產業研發碩士專班
105
The main theme of this thesis is to design and implement a phase-shift full-bridge converter using UCC3895 as the pulse-phase modulation controller to achieve zero voltage switching. The effective duty is adjusted by shifting the pulse position of this controller. Zero voltage switching is achieved by the external resonant inductor and parasitic capacitor of power devices to reduce the switching losses and thereby increasing the efficiency. The specifications of the designed and implemented converter include, input voltage = 156 V, output voltage = 48 V, output power = 500 W and switching frequency = 100 kHz. Experimental results show the efficiency is up to 88.79% and zero voltage switching is achieved. These results fully support the theoretical analysis and confirm the implementation.
48
Lee, Chin-hung, and 李志鴻. "Study and Analysis a Phase-Shifted Full Bridge Zero-Voltage and Zero-Current-Switching Converter for Current-Doubler Rectifier." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/42214979110880420091.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
95
The purpose of this thesis is to study and analyze a DC/DC switching converter for high output current application, which consists of a phase-shifted full bridge soft switching converter and a current-doubler rectifier. The proposed phase-shifted full bridge soft switching converter has zero-voltage and zero-current-switching features. It realizes ZVS at the leading leg and ZCS at the lagging leg for full bridge switches to improve the drawbacks of the conventional phase-shift circuit with zero-voltage-switching. The current-doubler rectifier increases the efficiency of converter on the transformer secondary side in high output current applications. Therefore, high efficiency and high output current can be accomplished. The thesis describes the operation principles and design procedures for the proposed converter. The IsSpice simulation and the laboratory experiments verify the feasibility of the proposed scheme.
49
Huang, Ci-Syuan, and 黃啟軒. "Li-ion Battery Charger Applying Phase-Shift Full Bridge Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/99657789659273502179.
Full textAbstract:
碩士國立東華大學
電機工程學系
96
In recent years, due to the gradually exhausted fossil fuel and the serious side-effect of greenhouse effect, energy-saving and carbon-reduction becomes a popular slogan for both government and citizens. In Taiwan, because of the well-development of highway construction and high road-vehicle density, on-road vehicles should be one of the blames for energy consumption and air pollution. To solve this problem, hybrid electric vehicle (HEV) is proposed to promote the energy efficiency and reduce the exhaust emission. As HEV is commercialized, plug-in hybrid electric vehicle (PHEV) becomes the novel research orientation. PHEV is expected to further reduce the oil consumption. Rechargeable (or secondary) battery is one of the crucial components of electric vehicles. Among varieties of rechargeable batteries, lithium-ion (Li-ion) batteries have the highest energy density. In order to trim the weight of electric vehicles, Li-ion batteries are the prominent power source candidates for the next-generation HEV. This thesis is to design and implement an on-board Li-ion battery charger for PHEV. Phase-shift full-bridge converter is adopted as the power stage of the charger to provide higher output power and higher conversion efficiency. Circuit is controlled by the TMS320F2812 digital signal processor chip that is manufactured by TI. Controller is responsible for steering the circuit to fulfill constant-current constant-voltage (CC-CV) charging profile, accompanied by the overcharging protection mechanism of Li-ion batteries.
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Yu, Zong-Han, and 余宗翰. "Design and Implementation of Phase-Shift Full-Bridge Electronic Ballast." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/68401112790770262093.
Full textAbstract:
碩士中原大學
電機工程研究所
95
A full bridge phase-shift resonance system for driving CCFL (Cold Cathode Fluorescent Lamp) with Piezoelectric Transformer (PT) is proposed in this paper. Piezoelectric Transformer has some advantages such as high efficiency, no EMI , flat-shape and etc. These advantages make PT very suitable to replace conventional electromagnetic transformer in driving CCFL. Analysis of full bridge phase-shift resonance inverter is mentioned. Phase-shift dimming to change illumination of lamps, and using ballast capacitor to balance the lamp currents are also discussed in this paper.