Dissertations / Theses: 'DC half-bridge converter'

1

Pfender, Mark E. "Simulating and testing a DC-DC half-bridge SLR converter." Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/34721.

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Approved for public release; distribution is unlimited
In order to obtain maximum battery lifetime and efficient operation, rechargeable batteries require unique charging profiles with an end-state, low current trickle charge. The series loaded resonant (SLR) charging system presented in this thesis meets the needs of an efficient, sensor integrated, and galvanically isolated trickle charger. The SLR DC-DC converter was successfully modeled in Simulink, and simulation results are verified in a laboratory application. The Simulink model and hardware are tested at several operating points. Component stresses are quantified and weak points are identified.

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2

Cezare, Marcel Jacon. "Circuito de comando de base proporcional isolado auto-oscilante para conversor CC/CC \"Half-Bridge\": uma metodologia de projeto." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-22122010-155606/.

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O presente trabalho apresenta o estudo, o equacionamento, a simulação e uma metodologia de projeto para um conversor CC/CC do tipo Half-Bridge, com transformador de potência alimentado por transistores bipolares em semi-ponte, com circuito de acionamento de base proporcional isolado. O circuito possui um controle de sincronismo aplicado ao transformador de pulso responsável pelo controle das chaves semicondutoras do conversor. A metodologia de projeto do circuito de acionamento de base proporcional isolado é discutida e alguns resultados são mostrados. Além disso, pretende-se empregar esse tipo de conversor em veículos aeroespaciais devido a robustez no circuito de acionamento de base, em específico na Unidade de Suprimento de Energia do satélite universitário ITASAT. Utilizando-se o diagrama esquemático do conversor proposto é feito o equacionamento matemático, a fim de se obter a frequência de oscilação livre, ou natural, a partir do qual é proposta uma metodologia de projeto. Ao final do trabalho são comparados os resultados experimentais com a simulação, com o objetivo de melhor avaliar a metodologia proposta.
This work presents the study, equation development, simulation and a design methodology for a Half-Bridge DC/DC converter, with power transformer fed by bipolar transistors in a half-bridge configuration, with proportional base drive circuit. The circuit has a synchronism control applied to the pulse transformer responsible for controlling the semiconductor switches of the converter. The design methodology of the proportional base drive is discussed and some results are shown. In addition, this type of converter is intended to be used in aerospace vehicles due to the increased robustness of the base drive circuit, for instance, the Power Supply Unit of ITASAT Satellite. A mathematical modeling is done in order to obtain the oscillation frequency (natural frequency) of the converter, from which a design methodology is proposed. At the end of the study the experimental are compared with the simulation, in order to evaluate the proposed methodology.

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Hällman, Oscar. "DC Charging of Heavy Commercial Plug-in Hybrid Electric Vehicles." Thesis, Linköpings universitet, Datorteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119618.

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A solution to reduce exhaust emissions from heavy commercial vehicles are to haul the vehicles completely or partially electric. This means that the vehicle must contain a significant electric energy source. The large capacity of the energy source causes the vehicle to either sacrifice a large part of its up time to charge the source or apply a higher charge power at the cost of power losses and lifetime of the energy source. This thesis contains a pre-study of high-power DC-charge of hybrid batteries from existing infrastructure suited to electric hybrid cars. Following parts are included in the thesis: modeling of a battery pack and a DC-DC converter, formulation of a MPC controller for the battery pack, analysis of charging strategies and battery restrictions through simulations. The thesis results shows that a longer charging time increases the energy efficiency and reduces the degradation in the battery. It also shows that a charging strategy similar to constant-current-constant-voltage charging should be used for a full charge of an empty battery.

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4

Li, Quan, and q. li@cqu edu au. "DEVELOPMENT OF HIGH FREQUENCY POWER CONVERSION TECHNOLOGIES FOR GRID INTERACTIVE PV SYSTEMS." Central Queensland University. School of Advanced Technologies & Processes, 2002. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20020807.152750.

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This thesis examines the development of DC-DC converters that are suitable for Module Integrated Converters, (MICs), in grid interactive photovoltaic (PV) systems, and especially concentrates on the study of the half bridge dual converter, which was previously developed from the conventional half bridge converter. Both hard-switched and soft-switched half bridge dual converters are constructed, which are rated at 88W each and transform a nominal 17.6Vdc input to an output in the range from 340V to 360Vdc. An initial prototype converter operated at 100kHz and is used as a base line device to establish the operational behaviours of the converter. The second hard-switched converter operated at 250kHz and included a coaxial matrix transformer that significantly reduced the power losses related to the transformer leakage inductance. The soft-switched converter operated at 1MHz and is capable of absorbing the parasitic elements into the resonant tank. Extensive theoretical analysis, simulation and experimental results are provided for each converter. All three converters achieved conversion efficiencies around 90%. The progressive increases in the operation frequency, while maintaining the conversion efficiency, will translate into the reduced converter size and weight. Finally different operation modes for the soft-switched converter are established and the techniques for predicting the occurrence of those modes are developed. The analysis of the effects of the transformer winding capacitance also shows that soft switching condition applies for both the primary side mosfets and the output rectifier diodes.

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5

Chen, Haoning (William). "LLC Resonant Current Doubler Converter." Thesis, University of Canterbury. Electrical and Computer Engineering, 2013. http://hdl.handle.net/10092/8492.

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The telecommunications market is one of the large rapidly growing fields in today’s power supply industry due to the increasing demand for telecom distributed power supply (DPS) systems. The half-bridge LLC (Inductor-Inductor-Capacitor) resonant converter is currently the most attractive topology for the design and implementation of 24V/48V DC telecom power converters. The current doubler rectifier (CDR) converter topology was invented and described in the early 1950s which can offer the unique characteristic of halving the output voltage while doubling the output current compared to a standard rectifier. In this thesis, the current doubler converter topology with its unique characteristic is evaluated as a complementary solution to improve the LLC resonant converter performance, especially for the low output voltage and high output current telecommunication applications. A novel half-bridge LLC resonant current doubler converter (LLC-CDR) is proposed in this thesis which can offer several performance benefits compared to conventional LLC-standard rectifier design . The unique characteristics of the LLC-CDR topology can offer significant improvements by transformation of a 48V converter into a 24V converter with the same power density. This thesis introduces a new SPICE-based simulation model to analyse the operation of this novel LLC-CDR converter circuit design. This model can be used to define the critical component parameters for the LLC -CDR circuit output inductor values. It can also be used to predict the circuit overall performance under different load conditions. Both time-domain based transient simulation analysis and frequency-domain based AC analysis provided by this simulation model showed favourable results in comparison to bench measurement results on a prototype. The model provides a valuable insight to reveal some of the unique characteristics of this LLC -CDR topology. It demonstrates a proof of concept that the conventional LLC resonant converter can be easily redesigned for low voltage, high current applications by using the LLC-CDR topology without requiring a new design for the LLC resonant stage components and the power transformer. A new magnetic integration solution was proposed to significantly improve the overall performance in the LLC-CDR topology that had not been published before. The LLC-CDR converter hardware prototypes with two output inductors coupled and uncoupled configurations were extensively modelled, constructed and bench tested.Test results demonstrated the suitability of an integrated coupled inductors design for the novel LLC-CDR converter application. The integrated coupled inductors design can significantly improve the LLC-CDR converter frequency-domain based AC simulation analysis results. In addition, these results also illustrate the potential benefit of how the magnetic integration design in general could reduce the magnetic component size, cost, and weight compared to the uncoupled inductors design. Finally, a hardware prototype circuit was constructed based on a commercial 1800 W single phase telecom power converter to verify the operation of this novel half bridge LLC-CDR topology. The converter prototype successfully operated at both no load and full load conditions with the nominal output voltage halved from 48VDC to 24VDC, and doubled the output current to match the same output power density. It also demonstrates that the efficiency of this novel half bridge LLC –CDR is 92% compares to 90% of EATON’s commercial 24VDC LLC resonant converter, which can fulfill the research goals.

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6

Yao, Liangbin. "HIGH CURRENT DENSITY LOW VOLTAGE ISOLATED DC-DC CONVERTERSWITH FAST TRANSIENT RESPONSE." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3205.

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With the rapid development of microprocessor and semiconductor technology, industry continues to update the requirements for power supplies. For telecommunication and computing system applications, power supplies require increasing current level while the supply voltage keeps decreasing. For example, the Intel's CPU core voltage decreased from 2 volt in 1999 to 1 volt in 2005 while the supply current increased from 20A in 1999 to up to 100A in 2005. As a result, low-voltage high-current high efficiency dc-dc converters with high power-density are demanded for state-of-the-art applications and also the future applications. Half-bridge dc-dc converter with current-doubler rectification is regarded as a good topology that is suitable for high-current low-voltage applications. There are three control schemes for half-bridge dc-dc converters and in order to provide a valid unified analog model for optimal compensator design, the analog state-space modeling and small signal modeling are studied in the dissertation and unified state-space and analog small signal model are derived. In addition, the digital control gains a lot of attentions due to its flexibility and re-programmability. In this dissertation, a unified digital small signal model for half-bridge dc-dc converter with current doubler rectifier is also developed and the digital compensator based on the derived model is implemented and verified by the experiments with the TI DSP chip. In addition, although current doubler rectifier is widely used in industry, the key issue is the current sharing between two inductors. The current imbalance is well studied and solved in non-isolated multi-phase buck converters, yet few discusse this issue in the current doubler rectification topology within academia and industry. This dissertation analyze the current sharing issue in comparison with multi-phase buck and one modified current doubler rectifier topology is proposed to achieve passive current sharing. The performance is evaluated with half bridge dc-dc converter; good current sharing is achieved without additional circuitry. Due to increasing demands for high-efficiency high-power-density low-voltage high current topologies for future applications, the thermal management is challenging. Since the secondary-side conduction loss dominates the overall power loss in low-voltage high-current isolated dc-dc converters, a novel current tripler rectification topology is proposed. Theoretical analysis, comparison and experimental results verify that the proposed rectification technique has good thermal management and well-distributed power dissipation, simplified magnetic design and low copper loss for inductors and transformer. That is due to the fact that the load current is better distributed in three inductors and the rms current in transformer windings is reduced. Another challenge in telecommunication and computing applications is fast transient response of the converter to the increasing slew-rate of load current change. For instance, from Intel's roadmap, it can be observed that the current slew rate of the age regulator has dramatically increased from 25A/uS in 1999 to 400A/us in 2005. One of the solutions to achieve fast transient response is secondary-side control technique to eliminate the delay of optocoupler to increase the system bandwidth. Active-clamp half bridge dc-dc converter with secondary-side control is presented and one industry standard 16th prototype is built and tested; good efficiency and transient response are shown in the experimental section. However, one key issue for implementation of secondary-side control is start-up. A new zero-voltage-switching buck-flyback isolated dc-dc converter with synchronous rectification is proposed, and it is only suitable for start-up circuit for secondary-side controlled converter, but also for house-keeping power supplies and standalone power supplies requiring multi-outputs.
Ph.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering PhD

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7

Moravec, Pavel. "Návrh spínaného laboratorního zdroje." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221251.

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In present days there is no scientific laboratory without quality, adjustable and powerful source of voltage and current. Therefore this thesis is focused on creating such power source, which can provide voltage and current high enough for most of experiments or for development electrical devices or parts, which are not connected to power grid. This power source is able to provide symmetric voltage 30 V and current 6 A high in each branch. It is possible to control this power source remotely thanks for USB interface, which is standard equipment of majority of modern devices in these days. LCD display is part of this source, which shows the user set and real parameters at the output as well.

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8

Šelepa, Jan. "Transformátorová páječka 500W." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218799.

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This thesis contains a complete description of the design and implementation of a 500W transformer soldering station. This soldering station includes a half-bridge DC/DC converter with a pulse transformer. The device works with a very low voltage and extremely high output current. Therefore some parts have a special design to ensure the proper equipment function. Coaxial transformer with very low leakage inductance (nH units) is unusual. A synchronous rectifier is another special feature working with low voltage and high output current of the transformer. The finished functional prototype consists of a soldering station and a soldering adapter.

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9

Deng, Songquan. "CONTROL AND TOPOLOGY IMPROVEMENTS IN HALF-BRIDGE DC-DC CONVERTERS." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2749.

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Efficiency and transient response are two key requirements for DC-DC converters. Topology and control are two key topics in this dissertation. A variety of techniques for DC-DC converter performance improvement are presented in this work. Focusing on the efficiency issue, a variety of clamping techniques including both active and passive methods are presented after the ringing issues in DC-DC converters are investigated. By presenting the clamping techniques, a big variety of energy management concepts are introduced. The active bridge-capacitor tank clamping and FET-diode-capacitor tank clamping are close ideas, which transfer the leakage inductor energy to clamping capacitor to prevent oscillation between leakage inductor and junction capacitor of MOSFETs. The two-FET-clamping tank employs two MOSFETs to freewheeling the leakage current when the main MOSFETs of the half-bridge are both off. Driving voltage variation on the secondary side Synchronous Rectifier (SR) MOSFETs in self-driven circuit due to input voltage variation in bus converter applications is also investigated. One solution with a variety of derivations is proposed using zerner-capacitor combination to clamping the voltage while maintaining reasonable power losses. Another efficiency improvement idea comes from phase-shift concept in DC-DC converters. By employing phase-shift scheme, the primary side and the secondary side two MOSFETs have complementary driving signals respectively, which allow the MOSFET to be turned on with Zero Voltage Switching (ZVS). Simulation verified the feasibility of the proposed phase-shifted DC-DC converter. From the control scheme point of view, a novel peak current mode control concept for half-bridge topologies is presented. Aiming at compensating the imbalanced voltage due to peak current mode control in symmetric half-bridge topologies, an additional voltage compensation loop is used to bring the half-bridge capacitor voltage back to balance. In the proposed solutions, one scheme is applied on symmetric half-bridge topology and the other one is applied on Duty-cycle-shifted (DCS) half-bridge topology. Both schemes employ simple circuitry and are suitable for integration. Loop stability issues are also investigated in this work. Modeling work shows the uncompensated half-bridge topology cannot be stabilized under all conditions and the additional compensation loop helps to prevent the voltage imbalance effectively.
Ph.D.
Department of Electrical and Computer Engineering
Engineering and Computer Science
Electrical Engineering

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10

Lin, Chih-Jung, and 林志融. "Implementation of Parallel Resonant Half-Bridge DC-DC Converter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/19336853258899885985.

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碩士
國立臺北科技大學
電機工程系碩士班
91
The objective of this thesis is to design and implement parallel resonant half-bridge converters to reduce the Electro-Magnetic Interference (EMI) and switching losses. The design specifications include: 155 V for input, 19 V for output, 90 W and 300 kHz for switching frequency. The load resonance is achieved by either varying the operation frequency or value of inductance of resonant tank. The resonant converters are analyzed by using the so-called “approximation analysis” method, which takes only fundamental component into consideration. Then the circuits are designed based upon the theoretical results. The designed circuits are implemented to verify the design process. Measured results demonstrate that 88% of efficiency for variable-inductor topology and 87.6% for variable-inductor plus variable-frequency topology can be achieved by the implemented converters, confirming the design and implementation.

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Huang, Sz-han, and 黃思翰. "Design and Implementation of Half bridge-Full bridge Bidirectional DC/DC Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/39124875660773202004.

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碩士
國立中正大學
電機工程所
98
This thesis presents design and implementation of an isolated bi-directional DC/DC converter with high voltage input、high conversion ratio and high output power for renewable power system applications. The topology of this circuit is half-bridge switch configuration at the high-voltage side and full-bridge switch configuration on the low-voltage side. In this circuit, the dsPIC chip realizes many functions, such as generation of PWM signals, A/D conversion and circuit protection,etc .When the voltage on the low-voltage side is below the normal range, the circuit is operated in buck mode. On the other hand, when the voltage on the low-voltage side is beyond the normal range, the circuit is operated in boost mode. If it is regulated within the normal range, the circuit is in idle mode. This thesis uses a active clamp snubber circuit to alleviate the voltage spike caused by the current difference between the filter inductor and leakage inductance of the isolation transformer. Finally,a 1 kW isolated bi-directional DC/DC converter has been implemented to verify the feasibility of this circuit.

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12

Pong, Chen-Yin, and 彭成銀. "Design and Applications of Asymmetrical Half Bridge DC-DC Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/68582976159588570263.

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碩士
清雲科技大學
電機工程研究所
96
This thesis consists of two parts. The first part presents analysis and design of an asymmetrical half bridge converter with flyback type transformer, in which the power switches can be turned on with ZVS and the output diode can be turned on and off with ZCS or low di/dt . The maximum voltage stress of power switches is not greater than the input voltage. While the ZVS is obtained from the magnetizing current, the ZCS is achieved from the resonant current. The soft switching conditions can be maintained from no load to full load range. The characteristics of the proposed converter rely on the utilization of resonant inductor and blocking capacitor as resonant devices rather than linearly charging and discharging components. The operational principle and design consideration of the proposed converter is described in this thesis. The experimental test along with computer simulation of a 90W/12V prototype converter is performed and the results are presented. The secondary part of this thesis deals with the design and implementation an asymmetrical half bridge DC-DC power converter with current doubler and synchronous rectifier for high efficiency power supply application. The operation modes, analysis and design, components selection, experimental prototype and measurements, and energy consumption analysis are performed in the thesis. In the proposed 300W/12V/25A converter, the synchronous rectifiers are driven by the transformer windings at the secondary side. Both the power switch and synchronous rectifier can be turned on with ZVS from no load to full load conditions, which results in high efficiency. The prototype test results show that the converter efficiency at full load is 88.25%, and is 92.6% at half load. The major energy consumptions focus on the conduction losses from semiconductor devices and hysteresis losses from magnetic components.

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Su, Ying-Jie, and 蘇英傑. "1 MHz LLC Half-Bridge Series Resonant DC-DC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/28nrqb.

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碩士
國立臺灣科技大學
電子工程系
105
Gallium-nitride high-electron-mobility transistors (GaN HEMT) have been prosperously developed these years. Besides their stability, they are also widely used in various applications. According to the structure, it can be divided into enhancement mode (eGaN) and depletion mode (dGaN). At different switching frequencies, dGaN and eGaN HEMT has their own unique advantages. This thesis applies dGaN and eGaN HEMT transistors on LLC half- bridge series resonant converter, making use of the property of ZVS and ZCS to reduce their switching loss at higher switching frequency. Synchronous rectifier is utilized on the secondary side to minimize the conduction loss resulted from the high output current. In addition, the use of a planar transformer has replaced the usually applied winding transformer in order to minimize the volume and boost its whole power density. In the end of the thesis, we built two LLC half bridge resonant converters operated at 1 MHz to perform the conversion from 380 V to 12 V with rated power of 500 W, in order to compare the properties of dGaN and eGaN. After comparing the data with the experimental results, it showed that when applying to 1 MHz, the power efficiency of the eGaN version has advantage over the dGaN version.

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Tsai, Chih-Hao, and 蔡志浩. "Analysis and Implementation for A Half-Bridge DC/DC LLC Resonant Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/32634285998242644244.

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碩士
國立成功大學
工程科學系碩博士班
96
In general,front-end DC/DC converters are classified into two types of pulsewidth modulation converters and resonant converters. Since a PWM converter is operating in hard switching, it leads to large switching losses so that the efficiency is degraded. A resonant converter with soft switching is thereby developed to reduce the switching loss and increase the efficiency. Therefore, an LLC resonant converter is investigated in this thesis. It is employed as the front-end DC/DC converter with high efficiency, high power density and high reliability on its performances. In the thesis, three types of traditional resonant converters are introduced. They are series resonant converter (SRC), parallel resonant converter (PRC) and series parallel resonant converter (SPRC, or LCC). The switching frequencies of these converters must increase to maintain a regulated output voltage, when the input voltage increases and the load becomes light. However, more circulating energy will be resulted form the higher switching frequencies. To proceed, the operating principle of an LLC resonant converter is presented. Its performances are compared with those of an LCC resonant converter. The LLC resonant converter exhibits the advantages over LCC converter. The main switches achieve ZVS operation and rectifier diodes have no reverse recovery current. The ZVS operation region of the converter increases when the loads become light. The circulating energy is still small even if the input voltage increases. Finally, the theoretical analysis is validated by IsSpice simulations and experimental results. It reveals that the LLC resonant converter achieves ZVS operation despite variations in input voltage and load resistance. A prototype of output LLC resonant converter with efficiency of is implemented in this thesis.

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Chen, Chun Yuan, and 陳俊蒝. "Design of a Gallium Nitride Transistor based Half-bridge DC-DC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/g8n9bn.

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16

Swaminathan, B. "Resonant Transition Topologies For Push-Pull And Half-Bridge DC-DC Converters." Thesis, 2004. http://hdl.handle.net/2005/317.

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Switched mode power supplies (SMPS) are being extensively used in most power conversion processes. The analysis, design and modeling processes of hard-switched converters are mature, where the switching frequency was limited to a few 10's of kHz. The present direction of evolution m SMPS is towards higher efficiency and higher power density. These twin objectives demand high switching frequency and low overall losses. Soft switching results in practically zero switching losses and extends the switching frequency to 100's of kHz and beyond. This thesis presents novel variants of push-pull and half-bridge DC-DC converters with soft switching properties. The proposed topology uses two additional switches and two diodes. The additional switches introduce freewheeling intervals m the circuit and enable loss-less switching. Switch stress, control and small signal model are similar to hard-switched PWM converter. Synchronous rectifiers are used in the ZVS push-pull converter to achieve high efficiency. It is interesting to see that the drives for the synchronous rectifier device are practically the same as the additional switches. The contributions made in this thesis are 1) Idealized analysis and design methodology for the proposed converters. 2) Validation of the design through circuit simulation as well as prototypes - a 300kHz, 200W push-pull converter and a 300kHz, 640W half-bridge converter. 3) Closed loop control design for desired bandwidth and accuracy Verification of loop gain through network analyzer instrumental for the same The loop gain bandwidth achieved is about 30kHz for the push-pull converter and 20kHz for half-bridge converter. An appendix has been devoted to explain the use of network analyzer. Characterization of coil, transformer and capacitor are explained in detail. Measurement techniques for measuring the small signal parameters of power supply are also explained in the appendix.

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SYU, JIA-SIANG, and 許嘉翔. "Analysis and Design on Hybrid-Switching Asymmetrical Half-Bridge Flyback DC - DC Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/67398848481072980101.

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碩士
國立臺灣科技大學
電子工程系
103
As the magnetic hysteresis loop can transverse over both the first and the third quadrants, the transformer of a half-bridge converter is able to process higher energy.This thesis proposes a hybrid-switching technique for half-bridge circuit that can be applied to flyback converters in order to increase the range of zero-voltage-switching (ZVS). In addition, the output diode can be turned off at zero current and the duty loss is minimized. Experimental results highlight the enhanced performance of the hybrid-switching technique on this circuit. Finally, the comparison on performances of the proposed converter and the conventional converter are performed to show the practicality of the proposed technique.

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18

SUN, SHNEG-HUANG, and 孫聖徨. "Implementation of Isolated Bidirectional Half-Bridge DC/DC Converter with Zero Voltage Switching." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/fzcf6t.

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碩士
國立虎尾科技大學
電機工程系碩士班
107
In recent years, the rapid development of the global economy and science and technology has caused environmental pollution and destruction. Countries have begun to develop green energy to replace fossil energy, For example: solar power, wind power, hydropower, etc., low pollution renewable energy. This thesis mainly Implementation of isolated bidirectional half-bridge DC/DC converter with zero voltage switching. The converter low-voltage side adopts current feeding type and the high-voltage side adopts voltage feeding type. In addition to reducing the voltage and current stress of the converter component, it can also extend battery life. The converter has the advantages of less component quantity, simple control method and zero voltage switching without additional auxiliary circuit. The converter has the following features: (1) When the four power switches operate in the boost mode and the buck mode, they can all have zero voltage switching within 20% to 90% of the full load; (2) Adjust the output voltage and output power through the phase shift angle change between the high and low voltage side power switch driving signals; (3) Analysis of the influence of transformer current due to unbalanced capacitor voltage, and analyzes the change of the transformer current in each working interval, and balances the high and low voltage capacitor voltages to improve the converter efficiency and reduce the power switch current stress. This thesis completes an isolated bidirectional 500W DC/DC converter with low-voltage side voltage of 40V~40V, high-voltage side voltage of 200V, switching frequency of 100kHz. According to the experimental results, the converter has a maximum efficiency of 92.3% at 60% full load.

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Tang, Shuo-Fu, and 唐碩甫. "A ZVS-PWM Half-Bridge DC/DC Converter: Analysis, Synthesis and Controller Design." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/jn5k77.

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碩士
國立成功大學
工程科學系碩博士班
92
In this thesis, based on the duty-cycle-shifted-PWM half-bridge (HB) converter, a ZVS-PWM half-bridge DC-DC converter is well designed. The ac small-signal mathematical model for the HB ZVS-PWM DC-DC converter is then derived. The theoretical analysis is verified by experiment and simulation of IsSpice. Finally, the controller is designed to achieve output voltage regulation. It is used to eliminate the effect of the variations of line voltage and load on the output voltage. 　　In the conventional HB converter, the oscillation between the MOSFET junction capacitance and transformer leakage inductance occurs when both switches turn off. In order to achieve ZVS, the converter is a variable frequency operation. The concept of this control scheme is shifting one of the two-channel symmetric PWM driving signals close to the other, while keeping the PWM control mode. As a result, ZVS is achieved for only one switch. 　　In this thesis, a novel half-bridge converter is proposed. The auxiliary switch is added to the HB duty-cycle-shifted PWM converter to create ZVS condition for both switches. It is a fixed frequency operation and the efficiency of the converter is improved to 93%. 　　The detailed circuit analysis for the proposed HB ZVS-PWM converter is also presented in this thesis. The small-signal model is then derived by the averaging method. Based on this model, the system dynamic behaviors can be investigated. As compared with the conventional HB converter, the HB ZVS-PWM converter exhibits better dynamic response. According to the small-signal mathematical model, a classical PI controller is designed to achieve output voltage regulation. The experimental responses show that the PI controller has a good regulation capacity under the variations of load and line voltage.

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20

Lien, Wen-Yuan, and 連文源. "A Half-Bridge ZVS Three-Level DC-DC Converter for High Input-Voltage Applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/99187620917638491112.

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碩士
國立臺灣科技大學
電子工程系
101
The main purpose of this thesis is to analyze a half-bridge zero-voltage-switching (ZVS) three-level DC-DC converter, which is suitable for high input-voltage applications. The voltage stress of the primary-side power switch is equal to half the input voltage. Therefore, it is easy to choose the power switch device. The control method adopts the commonly-used commercial analog IC UCC3895 to reach ZVS and reduce the switching loss effectively. So the conversion efficiency can be improved. With the aid of the simulation software tool, a 750-W DC-DC converter with an input voltage range of 800 V ~ 1000 V, an output voltage of 48 V is implemented. The full-load efficiency is up to 94 %. The voltage stress of the primary-side power switch device is selected 650 V. As a result, the feasibility for this DC-DC converter architecture is verified.

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21

Chao, Nan-Chih, and 趙南誌. "Current Sensorless Control for Three-Phase Half-Bridge AC/DC PFC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/p75725.

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碩士
國立交通大學
電機學院電機與控制學程
106
The current sensorless control for three phase half-bridge converter with power factor correction (PFC) function is presented in this thesis. Compared with conventional multiloop control methods, the proposed control strategy only requires two line voltages and two capacitor voltages to regulate the output voltage and achieve power factor correction. On the other hand, this control scheme can reduce the cost of circuits and simplify its complexity because there is no current sensor. Eventually, all the algorithms are implemented in a DSP chip TI TMS320F28335. The provided simulation and experimental results show the good performances of the proposed current sensorless control method.

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22

Chen, Tso-Min, and 陳佐民. "DC Characteristics and Small Signal Modeling of Asymmetrical Half Bridge Flyback Converter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/30269180477906251667.

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博士
國立臺灣大學
電機工程學研究所
91
The asymmetrical half bridge flyback converter, which can achieve zero voltage switching (ZVS) operation of the power switches and reduce the EMI noises, is gaining popularity. The simple capacitive filtering structure makes it suitable for the multi-output applications. This paper analyzes the detailed circuit characteristics of the asymmetrical half bridge flyback converter. The specific relationships between the duty cycle and the different types of energy in the energy storage elements are thoroughly investigated. From the analytical results, the maximum duty cycle is not bounded by 50%, which means that the converter can now be optimally used for the different applications. The ZVS conditions of the power switches are derived. Mathematical equations and design considerations are also given. According to the presented design guidelines, the ZVS operations of the power switches can be maintained from no-load to full-load conditions. The dynamic characteristics of this converter are also analyzed based on the derived small signal models. Not only the power stage, but also the control methods are considered in these models. These models can be easily implemented by Spice sub-circuits to derive the DC and small signal characteristics.

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23

Li, Yin-Chen, and 李胤辰. "Design and Implementation of a Half-Bridge Series-Resonant DC-DC Converter with Synchronous Rectification." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/wc7pqe.

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碩士
國立臺北科技大學
電力電子產業研發碩士專班
97
This thesis provides a half-bridge series-resonant DC-DC converter with synchronous rectification as the post-regulator in which zero-voltage switching is implemented to reduce switching losses. In order to solve the voltage drift caused by light load or no-load, the frequency modulation (FM) accompanied with pulse width modulation (PWM) is applied. The implemented half-bridge series-resonant DC-DC converter specifies that the maximum power is 420W, the input voltage is 380V and the output voltage/currents are 12V/5A, 24V/5A and 48V/5A respectively wherein CM6900G available from CHAMPION is used as the FM and PWM controller. Finally, experimental results conform to theoretical analysis.

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24

Jun-XianHuang and 黃俊憲. "Design and Implementation of Three-Level Half-Bridge Bidirectional CL3C Resonant DC Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/bhtz7v.

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25

Tung, Che-ming, and 董哲明. "Study and Implementation of a ZVS Half-Bridge Isolated Bi-Directional DC-DC Converter for UPS Application." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/24205437667067648916.

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碩士
國立臺灣科技大學
電子工程系
100
This thesis studies and implements a bi-directional converter for uninterruptible power supply (UPS) systems. Differences between the half-bridge topology and the full-bridge counterpart are discussed. The full-bridge topology is suitable for high-power applications. On the other hand, the half-bridge converter features low circuit cost, high power density, simple control demand and low current ripple. Moreover, the zero-voltage switching (ZVS) can be realized without additional switch. Therefore, the half-bridge topology is preferred for medium-power applications to satisfy the low-cost requirement and long battery life. In this thesis, the digital control is fulfilled by the TMS320F28035 DSP chip. Finally, a ZVS half-bridge isolated bi-directional DC-DC converter with 500-W rated power has been built and tested. The low-side voltage is 40 V and the high-side voltage is 200 V. Experimental results of the prototype converter are shown and discussed to verify the feasibility of the studied scheme.

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26

Yeh, Tsung-I., and 葉淙益. "A Current-Doubler Rectifier ZVS Asymmetrical Half-Bridge DC/DC Converter with Synchronous Rectification: Analysis and Synthesis." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/28740557452818180657.

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碩士
國立成功大學
工程科學系碩博士班
93
Abstract In this thesis, based on the asymmetrical half-bridge (AHB) converter, a current-doubler rectifier ZVS AHB DC/DC converter is designed for the application of high current operation. The full-wave rectification with a central-taped transformer is replaced by the current-doubler rectification. Additionally, in order to improve the efficiency of the converter operating in heavy loads, the technique of synchronous rectification is used to reduced the conduction losses of output rectifier. The presented converter possesses the properties of high efficiency. The current-doubler rectification is envoled from the full-wave rectification. The advantages of this topology are not only easy implementation of the transformer, but also the rms current of secondary wilding of the transformer is much less than that of full-wave rectification topology. It follows from the facts that the magnitude of rms current is proportional to the copper losses. The copper losses of the current-doubler rectification is thereby less than that of the full-wave rectification under high current operation. The efficiency of the converter operating in is 85.5% by the experiment. Additionally, in order to improve the efficiency of the converter, the technique of synchronous rectification is applied in the output rectifier to reduce the high conduction losses due to the forward-voltage of the output diodes. The converter still has high efficiency when operating in low voltage and high current conditions. The detailed circuit analysis for the proposed current-doubler rectifier ZVS AHB converter is also presented in this thesis. The small-signal model is then derived by the averaging method. According to the small-signal mathematical model, a phase leading and phase lag compensator and a minor-loop controller are both designed to achieve output voltage regulation. The experimental responses show that the controllers has a good regulation capacity under the variations of load and line voltage.

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27

Su, Hao-Bin, and 蘇豪斌. "Analysis and Synthesis for A Novel ZVT-PWM Diagonal Half-Bridge Forward DC/DC Converter with Synchronous Rectification." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/53072295022980075395.

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碩士
國立成功大學
工程科學系碩博士班
94
Based on the Diagonal Half-Bridge Forward (DHBF) DC/DC converter and soft switching technique, a novel Zero-Voltage-Transition Pulse-Width Modulation (ZVT-PWM) DHBF DC/DC converter is proposed in this thesis. It has high power conversion efficiency. 　　The diagonal switches of the conventional DHBF converter exhibits hard switching. To achieve soft-switching operation, the voltages of the diagonal switches must resonate down to zero before switching. 　　The proposed converter is developed by paralleling an auxiliary circuit at primary side of the transformer of the DHBF converter. The auxiliary circuit comprises a resonant inductor, a resonant capacitor and an auxiliary switch, which is used to control resonant occurrence. The diagonal switches of the proposed converter can operate under zero-voltage switching (ZVS) and the auxiliary switch can also operate under zero-current switching (ZCS). It is effective to increase the efficiency of the converter. Moreover, the synchronous rectification technique is also employed to reduce the conduction losses of the output rectifier. As a result, the proposed converter still exhibits high efficiency at heavy load. 　　The operation principle and theoretical analysis of the proposed converter are presented herein. They are validated by IsSpice simulations and experimental results. A prototype of ZVT-PWM DHBF converter for input and / output is finally implemented. The overall efficiency of the proposed converter achieves at full load. The efficiency of the soft switching technique and the synchronous rectification technique is demonstrated by the proposed ZVT-PWM DHBF DC/DC converter.

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28

WANG, HSIANG-LIN, and 王相霖. "Implementation of Interleaved Bidirectional Half-Bridge CLLC Resonant DC-DC Converter for Energy Storage Systems of Electric Vehicles." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6xcpeh.

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碩士
國立虎尾科技大學
電機工程系碩士班
107
In recent years, electric vehicles have been viewed as distributed power sources for storing electricity and sending it back to the grid, but electric vehicle energy storage systems need to be capable of operating in bidirectional power transmission. The purpose of this thesis is to develop an interleaved bidirectional CLLC resonant converter for electric vehicle energy storage systems. This topology is connected in parallel by two sets of converters with phase-shifted switch by 90°. The converter output DC voltage can be voltage-regulated by frequency modulation control. The converter also has the following features: (1) Symmetrical architecture with bidirectional power transfer characteristics, and soft switching of power switches during bidirectional power transfer; (2) Use of interleaved technology to reduce output current ripple and increase Power and stability; (3) The asymmetric pulse modulation method is used to limit the input power to solve the problem of load sharing due to the difference of the resonant tanks in parallel. This paper completes a DC-DC converter for electric vehicle energy storage system, which features bidirectional power transmission, low output current ripple and load balancing. Finally, a DC-DC converter with an input DC voltage of 350V and an output voltage of 280V~400V and a maximum power of 1000W is developed. The experimental results show that the maximum efficiency of the charging mode can reach 92.4%, and the maximum efficiency of the discharge mode is also 92.3%.

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29

Liu, Che-Kang, and 劉哲綱. "Study and Implementation of two-Transformer Half-Bridge DC/DC Converter with a Secondary-Side Series Resonant Tank." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/06873660756391299789.

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碩士
國立臺灣科技大學
電子工程系
101
This thesis focuses on the study and implementation of a series resonant converter (SRC) with a secondary-side resonant tank. In general, an SRC with primary-side resonant tank is adopted for the applications with high input voltages and low output voltages. When it is applied on a system with a low input voltage and high output voltage, the equivalent output load reflected from the secondary to the primary will be very small. If the quality factor is designed to be low, the characteristic impedance, which is equal to the gain of the quality factor and the reflected output load, will also be small. This causes difficulty in designing the resonant tank elements. However, for an SRC with secondary-side resonant tank suitable for low input voltage and high output voltage applications, the transformer is difficult to design because the primary switch current is high. Alternatively, two transformers paralleled at the primary side feature inherent current sharing, can solve the heat problem. A laboratory prototype with 24-V input and 200-V output was built and tested to verify the feasibility of the proposed scheme, a commercial IC CM6900 with a simple auxiliary circuit was used to realize the studied control strategy. Tight voltage regulation can be achieved according to the experimental results.

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30

Ding, Pei-Lun, and 丁培倫. "A Novel Single-Phase Half-Bridge AC/DC Converter with Regeneration and Adjustable Power Factor." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/zy23gw.

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碩士
國立虎尾科技大學
電機工程研究所
98
The thesis proposes a novel single-phase half-bridge AC/DC converter with energy regeneration and adjustable power factor. Based on a generalized zero vector technique , the novel single-stage converter of AC to DC consists of a single-phase half-bridge boost rectifier and a buck converter. The proposed converter has several advantages such as input current sinusoidal waveform, energy regeneration and adjustable power factor etc.. By TI TMS28335 DSP and Vissim Embeded control software the digital control circuit is achived. To detect output voltage and input current, current harmonic and power factor can be improved. Furthermore, both DC and small signal mathmatic models of the proposed converter are established to obtain system transfer function. Finally, some experimental results are presented to verify the effectiveness of the proposed converter.

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31

Liu, Danwei. "Topology, development, and control of a three-port triple-half-bridge dc-dc converter for hybrid energy storage application." 2006. http://etd.lib.fsu.edu/theses/available/etd-11082006-165913.

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Thesis (Ph. D.)--Florida State University, 2006.
Advisor: Hui Li, Florida State University, College of Engineering, Dept. of Electrical and Computer Engineering. Title and description from dissertation home page (viewed jan. 29, 2007). Document formatted into pages; contains xiii, 104 pages. Includes bibliographical references.

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32

Moshirvaziri, Mazhar. "Ultracapacitor/Battery Hybrid Energy Storage Systems for Electric Vehicles." Thesis, 2012. http://hdl.handle.net/1807/33458.

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This thesis deals with the design of Hybrid Energy Storage System (HESS) for Light Electric Vehicles (LEV) and EVs. More specifically, a tri-mode high-efficiency non-isolated half-bridge converter is developed for the LEV based HESS applications. A 2 kW, 100 V interleaved two-phase converter prototype was implemented. The peak efficiency of 97.5% and a minimum efficiency of 88% over the full load range are achieved. Furthermore, a power-mix optimizer utilizing the real-time Global Positioning System (GPS) data for the EV based HESS is proposed. For a specific design, it is shown that at the cost of less than 1.5% of the overall energy savings, the proposed scheme reduces the peak battery charge and discharge rates by 76% and 47%, respectively. A 30 kW bi-directional dc-dc converter is also designed and implemented for future deployment of the designed HESS into a prototype EV, known as A2B.

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33

Lin, Jing-cheng, and 林金成. "Development of Asymmetrical Half-Bridge DC-DC Power Converters." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/33927329056506863992.

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碩士
國立臺灣科技大學
電機工程系
96
This thesis is concerned with the development of an asymmetrical half-bridge dc-dc power converter. The proposed asymmetric half-bridge structure has the characteristics of zero-voltage switching, low breakdown voltage of power transistor and low turn ratio transformer. The geometric structure of magnetic materials is used to integrated transformers and inductors of asymmetrical half-bridge dc-dc power converters into a single magnetic component to reduce size and height, and thereby increasing the power density of dc-dc converter. The thesis consists of the design and implement of the asymmetrical half-bridge dc-dc power converters, integrated transformers and inductors as well as the control circuits. The system is simulated by the software package SIMetrix/SIMPLIS to verify the analysis. An experimental system of 18V, 180W output power for input dc voltage ranging from 240V to 380V is built. The overall efficiency is 0.87.

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34

Lin, Houng-min, and 林晃民. "High Power Factor Asymmetrical Half-Bridge AC/DC Converters." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/54364489181671925104.

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碩士
義守大學
電機工程學系碩士班
93
The asymmetrical half-bridge converter has many advantages such as soft switching properties, lower switch loss, lower EMI, lower voltage and current stress. Besides, it has low output voltage ripple due to ting dead time. Therefore it is suitable for the DC/DC cell. By using boost-type converter as a PFC cell, high power factor can be achieved without additional controller for discontinue-conduction-mode operation. The operation principle and equivalent circuits of the single-stage AC/DC converter in every operating stage be described and analyzed in detail. For this research, computer simulation using IsSpice has been applied. Experimental results have verified the theoretical analysis and computer simulation.

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35

Lin, Houng-Min, and 林晃民. "High Power Factor Asymmetrical Half-Bridge AC/DC Converters." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/64173443455324736974.

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碩士
義守大學
電機工程學系碩士班
93
ABSTRACT The asymmetrical half-bridge converter has many advantages such as soft switching properties, lower switch loss, lower EMI, lower voltage and current stress. Besides, it has low output voltage ripple due to ting dead time. Therefore it is suitable for the DC/DC cell. By using boost-type converter as a PFC cell, high power factor can be achieved without additional controller for discontinue-conduction-mode operation. The operation principle and equivalent circuits of the single-stage AC/DC converter in every operating stage be described and analyzed in detail. For this research, computer simulation using IsSpice has been applied. Experimental results have verified the theoretical analysis and computer simulation.

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36

Lin, Shang-Ze, and 林尚澤. "Study and Implementation of Control Strategy for Input-Series Output-Parallel Modular DC-DC Converters: Based on Asymmetrical Half-Bridge Converters." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/d93559.

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碩士
崑山科技大學
電機工程研究所
102
The input-series output-parallel (ISOP) modular DC-DC converter based on asymmetrical half-bridge converters (AHBC) is studied in this thesis. It consists of three AHBC modules connected in series at the input and in parallel at the output with interleaved operation. The converter is suitable for high input-voltage and high output- current applications. To ensure the proper operation, the input voltage sharing and output current sharing evenly are the key techniques of the ISOP modular converters. Based on the small-signal equivalent circuit of AHBC converter, the small-signal transfer functions from the duty cycle to the output voltage and the module input voltages of the ISOP-AHBC modular converter are derived. This thesis uses a new two-loop control strategy which has the advantage of decoupling the input voltage sharing regulation (IVSR) and output voltage regulation (OVR). In other words, the control system can be decoupled from three independent single-input and single-output systems. The K-factor method is used to design the controllers such that the goals of input voltage sharing evenly, output current sharing evenly and output voltage regulation are reached. Finally, the experimental result of the ISOP modular converter is presented. The converter with input voltage 600 V, output voltage 24 V and output power 720 W is implemented. The performance of input voltage sharing regulation, output current sharing regulation and output voltage regulation is conformed under the conditions of input voltage variation and load change.

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37

Wei, Ta-Chang, and 魏大倉. "Study and Implementation of Digital Single-Phase Half-Bridge Neutral Point Clamped AC/DC/AC Converte." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/53754003710033861016.

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碩士
國立雲林科技大學
電機工程系碩士班
91
Recently more and more power electronic products were used in the industry. These power electronic circuits result in large harmonic current into the power system In the thesis, the power converters using the neutral point clamped technology were proposed. With the advantages of low voltage rating of the switching devices, bidirectional power flow, lower voltage harmonics and less current distortion, the proposed neutral point clamped power converter can be operated to a power factor corrector, DC/AC inverter and AC voltage regulator. The simulation results and experiments results were presented to verify the effectiueness of the proposed control scheme.

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38

Fu, Jiu-Feng, and 傅久峰. "Design and Implementation of a DSP-Based Power Factor Corrector for Single-Phase Half-Bridge Line-Interactive AC-DC Converters." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/26321817745598582518.

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碩士
國立交通大學
電機資訊學院碩士在職專班
93
This thesis presents the design and implementation of a DSP-based single-phase half-bridge line-interactive power conditioner for the reduction of reactive and harmonic current generated by the nonlinear load. While the utility power on, the power conditioner works in current-controlled mode so as to not only compensate the reactive power of the load and maintain a unity power factor of input current but also charge the battery. While the unity power is failed, the power conditioner works in voltage-controlled mode so as to output AC voltage. The proposed controller consists of an inner current-loop controller and an outer voltage-loop controller. The proposed control scheme has been verified by using computer simulation with PSIM and implemented using a single-chip DSP controller. Experimental verification has been carried out on a 2 kVA half-bridge line-interactive power conditioner. Experimental results show a power factor of 0.99 at rated output condition

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