• Title/Summary/Keyword: Half-bridge

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A High-efficiency Buck-boost Half-bridge Inverter for Single-phase Photovoltaic Generation (단상 태양광 발전용 고효율 벅부스트 하프브리지 인버터)

  • Hyung-Min Ryu
    • Journal of IKEEE
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    • v.27 no.4
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    • pp.450-455
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    • 2023
  • Among single-phase photovoltaic inverters that can avoid excessive leakage current caused by the large parasitic capacitance of photovoltaic panels, a boost converter followed by a half-bridge inverter is the simplest and has the smallest leakage current. However, due to the high DC-link voltage, the rated voltage of the switching devices is high and the switching loss is large. This paper proposes a new circuit topology which can operate as a buck-boost inverter by adding two bidirectional switches to the output side of the half-bridge inverter instead of removing the boost converter. By reducing two stages of power conversion through the high-voltage DC-link to one stage, power loss can be reduced without increasing costs and leakage current. The feasibility of the proposed circuit topology is verified by computer simulation and power loss calculation.

Split-Capacitor Dual-Active-Bridge Converter (Split-Capacitor Dual-Active-Bridge 컨버터)

  • Kim, Kisu;Park, Siho;Cha, Honnyong;Choi, Byungcho
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.5
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    • pp.352-358
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    • 2018
  • A split-capacitor (SC) dual-active-bridge (DAB) converter is proposed in this study. The DC-link capacitors of input and output are split in the proposed converter. The primary and secondary windings of transformer are connected to the midpoints of the DC-links. Hence, the SC DAB converter can inherently prevent transformer from saturation. Although the switch current stress of the proposed converter is twice that of the conventional DAB converter, the switch voltage stress is reduced by half. Therefore, the proposed converter can reduce switching loss and achieve high efficiency in a high switching frequency. Given the SC structure, the proposed converter can readily be connected to neutral-point-clamped- or half-bridge-type converters. The topology of the proposed converter is presented and the operating principle is analyzed in detail. A 3-kW hardware prototype was built and tested to verify the performance of the proposed converter.

A Study on Full Bridge and Half Bridge Mode Transition Method of LLC Resonant Converter for Wide Input and Output Voltage Condition (넓은 입출력 전압을 위한 LLC 공진형 컨버터의 풀 브리지-하프 브리지 모드 변환 기법 연구)

  • Choe, Min-Yeong;Baek, Seung-Woo;Kim, Hag-Wone;Cho, Kwan-Yuhl;Kang, Jeong-Won
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.4
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    • pp.356-366
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    • 2022
  • This paper presents a mode transition method that applies frequency compensation technique of an LLC resonant converter for stable mode transition. LLC resonant converters used in various applications require high efficiency and high power density. However, because of circuit property, a wider voltage gain range equates to a greater circuit loss, so maintaining high efficiency at all voltage gain ranges is difficult. In this case, full bridge-half bridge mode transition method can be used, which maintains high efficiency even in a wide voltage gain range. However, this method causes damage to the circuit through overcurrent by the mode transition. This study analyzes the cause of the problem and proposes a mode transition method that applies frequency compensation technique to solve the problem. The proposed method verifies the stable transition through simulation analysis and experimental results.

A High Efficiency ZVS PWM Asymmetrical Half Bridge Converter for Plasma Display Panel Sustaining Power Modules

  • Han Sang-Kyoo;Moon Gun-Woo;Youn Myung-Joong
    • Journal of Power Electronics
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    • v.5 no.1
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    • pp.67-75
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    • 2005
  • A high efficiency ZVS PWM asymmetrical half bridge converter for a plasma display panel (PDP) sustaining power modules is proposed in this paper. To achieve the ZVS of power switches for the wide load range, a small additional inductor L/sub 1kg/, which also acts as an output filter inductor, is serially inserted into the transformer's primary side. At that point, to solve the problem of ringing in the secondary rectifier caused by L/sub 1kg/, the proposed circuit employs a structure without the output filter inductor, which helps the voltages across rectifier diodes to be clamped at the output voltage. Therefore, no dissipative RC (resistor capacitor) snubber for rectifier diodes is needed and a high efficiency as well as low noise output voltage can be realized. In addition, since it has no large output inductor filter, the asymmetrical half bridge converter features a simpler structure, lower cost, less mass, and lighter weight. In addition, since all energy stored in L/sub 1kg/ is transferred to the output side, the circulating energy problem can be effectively solved. The operational principle, theoretical analysis, and design considerations are presented. To confirm the operation, validity, and features of the proposed circuit, experimental results from a 425W, 385Vdc/170Vdc prototype are presented.

Low-cost Single-Phase Half-bridge Active Power Filter with One Current Sensor (단일 전류센서를 갖는 저가의 단상 반브릿지 능동전력필터)

  • 김희중;한병문;박용식
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.4
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    • pp.342-348
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    • 1999
  • This paper describes a low-cost single-phase active power filter, which consists of a half-bridge P\A미1 inverter with a s simple control circuit. In order to verify the performance of proposed active power filter, many computer simulations w with EMTP codes and experimental works with a hardware prototype were done. Both results confirm that the p proposed active power filter shows excellent performance to eliminate the harmonics generated in the single-phase non l linear‘ load. The active power filter has advantage of low implementation cost and compact size. using a half-bridge i inverter and a simple control circuit with only one current sensor. So. it can be fabricated as a plug-in type.

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Parallel Operation of a Pair of SITs in order to raise the High Frequency and Power Half-Bridge Inverter (고주파 및 고전력 인버터 적용을 위한 Half-Bridge SIT의 병렬운전 특성고찰)

  • Choi, Sang-Won;Kim, Jin-Pyo;Lee, Jong-Ha
    • Proceedings of the KIEE Conference
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    • 1997.07f
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    • pp.2234-2236
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    • 1997
  • The SIT, a Static Induction Transistor, is a semiconductor switch that is also called the power junction field-effect transistor (power JFET). Its characteristics are similar to a MOSFET except that its power level is higher and its maximum frequency of operation is lower. The normal method to protect against internal circuit transients of the form of di/dt or dv/dt is the use of snubber circuits. However, the limits of di/dt and dv/dt are high enough for the SIT that it is possible to operate without snubber circuits. SITs can be connected in parallel in order to cope with higher load currents that the value of an individual device rating. The purpose of this study is to investigate the parallel operation of SITs. In this experiment, we used a half-bridge inverter, the output of inverter is up to almost 1MHz and 2kW. Experimental results show that the operation of parallel connected SITs are facilitated individually good current sharing. The reason is the positive temperature coefficient of resistance of the SIT.

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Study On Photovoltaic Module Integrated Converter based on Active Clamp Current-fed Half-Bridge Converter (능동 클램프 전류원 하프 브릿지 기반 태양광 모듈 집적형 전력변환장치에 대한 연구)

  • Jung, Hoon-Young;Park, Jeong-Kyu;Ji, Young-Hyok;Won, Chung-Yuen;Lee, Tae-Won
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.2
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    • pp.105-113
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    • 2011
  • In this paper, photovoltaic module integrated converter (MIC) based on active clamp current-fed half-bridge converter is proposed. The converter stage operates in zero-voltage condition using active clamp technique. The theoretical study and circuit design for proposed inverter are confirmed with PSIM simulator and experimental reusult.

A Study on Characteristic Analysis of High Frequency Generating Circuit Integrated Chopper-Inverter with High Power-Factor (고역률 초퍼-인버터 일체형 고주파 발생회로의 특성해석에 관한 연구)

  • Won Jae-Sun;Park Jae-Wook;Nam Seung-Sik;Lee Bong-Seob;Seok Jul-Ki;Kim Dong-Hee
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.10
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    • pp.610-617
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    • 2004
  • This paper presents a novel high frequency generating circuit integrated chopper-inverter using ZVS with high power-factor. The proposed topology is integrated half-bridge boost rectifier as power factor corrector(PFC) and half-bridge high frequency resonant inverter into a single-stage. The input stage of the half-bridge boost rectifier works in discontinuous conduction mode(DCM) with constant duty cycle and variable switching frequency. So that a boost converter makes the line current follow naturally the sinusoidal line voltage waveform. Simulation results have demonstrated the feasibility of the proposed high frequency resonant inverter. Characteristics values based on characteristics analysis through circuit analysis is given as basis data in design procedure. Also, experimental results are presented to verify theoretical discussion. This proposed inverter will be able to be practically used as a power supply in various fields as induction heating applications. fluorescent lamp and DC-DC converter etc.

Dynamic Characteristic Analysis of 3-Level Half-bridge SSSC (3-레벨 반브리지로 구성된 SSSC의 동특성 분석)

  • 박상호;하요철;백승택;김희중;한병문
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.4
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    • pp.317-324
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    • 2001
  • This paper proposes a SSSC based on 3-level half-bridge inverters. The dynamic characteristic of the proposed SSSC was analyzed by EMTP simulation and a scaled hardware model, assuming that the SSSC is inserted in the transmission line of the one-machine-infinite-but power system. The proposed SSC has six 3-level half-bridge inverters per phase, which operates in PWM mode. The proposed SSSC generates a quasi-sinusoidal output voltage by 90 degree phase shift to the line current. The proposed SSSC does not require the coupling transformer for voltage injection, and has a flexibility in operation voltage by increasing the number of series connection.

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Design and Analysis of Resonant Bidirectional AC-DC Converter using Dual Half-Bridge Converter (듀얼 하프브릿지를 이용한 공진형 양방향 AC-DC 전력변환기 해석 및 설계)

  • Byen, Byeng-Joo;Choi, Jung-Muk;Han, Dong-Hwa;Lee, Young-Jin;Seo, Hyun-Uk;Choe, Gyu-Ha
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.2
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    • pp.184-191
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    • 2013
  • In this paper, bidirectional AC-DC converter using dual half-bridge converter is proposed. A transformer leakage inductance in the dual half-bridge converter is used for making resonance with the capacitor of the voltage-doubler, which can help the switched current to be sinusoidal without extra inductive component and also the switching loss can be reduced through operation such as ZVS, ZCS. Both circuit analysis and design guideline are described, and also the feasibility for the proposed converter is shown through the hardware implementation and the experimental results.