• Title, Summary, Keyword: Zero voltage switching (ZVS)

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A Family of Magnetic Coupling DC-DC Converters With Zero-Voltage-Switching Over Wide Input Voltage Range and Load Variation

  • Chen, Guipeng;Dong, Jie;Deng, Yan;Tao, Yong;He, Xiangning;Wang, Yousheng
    • Journal of Power Electronics
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    • v.16 no.5
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    • pp.1639-1649
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    • 2016
  • This paper presents a family of soft-switching DC-DC converters with a simple auxiliary circuit consisting of a coupled winding and a pair of auxiliary switch and diode. The auxiliary circuit is activated in a short interval and thus the circulating conduction losses are small. With the auxiliary circuit, zero-voltage-switching (ZVS) and zero-current-switching are achieved for the main and auxiliary switches respectively, over wide input voltage range and load variation. In addition, the reverse-recovery problem of diodes is significantly alleviated because of the leakage inductor. Furthermore, the coupled inductor simultaneously serves as the main and auxiliary inductors, contributing to reduced magnetic component in comparison with the conventional zero-voltage-transition (ZVT) converters. Experimental results based on a 500 W prototype buck circuit validate the advantages and effectiveness of the proposed magnetic coupling ZVS converter.

A New Zero-Voltage-Switching PWM Converters with Zero-Current-Switched Auxiliary Switch (영전류 스위칭 방식의 보조스위치를 갖는 새로운 영전압 스위칭 방식의 PWM 컨버터)

  • 마근수;홍일희;김양모
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.12
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    • pp.632-640
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    • 2003
  • In conventional Zero-Voltage-Transition(ZVT) PWM converters, zero-voltage turn-on and turn-off for main switch without increasing voltage/current stresses is achieved at a fixed frequency. The switching loss, stress, and noise, however, can't be minimized because they adopt auxiliary switches turned off under hard-switching condition. In this paper, new ZVS-PWM converters of which both active and passive switches are always operating with soft-switching condition are proposed. Therefore, the proposed ZVS-PWM converters are most suitable for avionics applications requiring high-power density. Breadboarded ZVS-PWM boost converters using power MOSFET are constructed to verify theoretical analysis.

A Study on the Zero-Voltage-Switching Three-Level DC/DC Converter using Primary Clamping Diodes (1차측 클램핑 다이오드를 이용한 ZVS Three-Level DC/DC 컨버터에 관한 연구)

  • Kim, Yong
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.12
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    • pp.101-108
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    • 2013
  • This paper presents A Zero-Voltage-Switching(ZVS) Three-Level DC/DC Converter using Primary Clamping Diodes. The Previous ZVS Three-Level DC/DC converter realizes ZVS for the switches with the use of the leakage inductance(or external resonant inductance) and the output capacitors of the switches, however the rectifier diodes suffer from recovery which results in oscillation and voltage spike. In order to solve this problem, this paper proposes a novel ZVS Three-Level DC/DC converter, which introduces two clamping diodes to the basic Three-Level converter to eliminate the oscillation and clamp the rectified voltage to the reflected input voltage.

High Frequency Inverter using Zero-Voltage-Switching (Zero-Voltage-Switching을 이용한 고주파 인버어터)

  • Sim, K.Y.;Moon, C.S.;Kim, D.H.;Kim, Y.H.;Yoo, D.W.
    • Proceedings of the KIEE Conference
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    • pp.1133-1135
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    • 1992
  • This paper describes high frequency inverter using zero voltage switching(ZVS). The ZVS operation is achieved to reduce the switching stress and switching loss under high speed switching. The proposed circuit configuration and performance are discussed. Its operation characteristics are evaluated through computer-aided simulation.

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New Zero-Current-Transition (ZCT) Circuit Cell Without Additional Current Stress

  • Kim Chong-Eun;Choi Eun-Suk;Youn Myung-Joong;Moon Gun-Woo
    • Proceedings of the KIPE Conference
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    • pp.294-298
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    • 2003
  • In this paper, the new zero-current-transition (ZCT) circuit cell is proposed. The main switch is turned-off under the zero current and zero voltage condition, and there is no additional current stress and voltage stress in, the main switch and the main diode. The Auxiliary switch is turned-off under the zero voltage condition, and the main diode is turned-on under the zero voltage condition, The resonant current required to obtain the ZCT is small and regenerated to the input voltage source. The operational principles of the boost converter integrated with the proposed ZCT circuit cell is analyzed theoretically and verified by the simulation and experimental result. Index terms - zero-current-transition (ZCT), zero-current- switching (ZCS), zero-voltage-switching (ZVS)

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A Study on the Three-Level Converter using Primary Auxiliary Circuit (1차측 보조회로를 이용한 Three-Level 컨버터에 관한 연구)

  • Bae, Jin-Yong;Kim, Yong;Cho, Kyu-Man
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.6
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    • pp.972-981
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    • 2008
  • A New ZVS(Zero Voltage Switching) and ZVZCS(Zero Voltage and Zero Current Switching) Three-Level Converter is proposed. The proposed converter presented in this paper used a phase shift control with a flying capacitor in the primary side to achieve ZVS for the all switch. A primary auxiliary circuit, which consists of one coupled inductor, is added in the primary to provide ZVZCS conditions to primary switches. Many advantages including simple circuit topology high efficiency, and low cost make this converter attractive for high power applications. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 2kW(27V, 74A) 40 kHz IGBT based experimental circuit.

A Simple Structure of Zero-Voltage Switching (ZVS) and Zero-Current Switching (ZCS) Buck Converter with Coupled Inductor

  • Wei, Xinxin;Luo, Ciyong;Nan, Hang;Wang, Yinghao
    • Journal of Power Electronics
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    • v.15 no.6
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    • pp.1480-1488
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    • 2015
  • In this paper, a revolutionary buck converter is proposed with soft-switching technology, which is realized by a coupled inductor. Both zero-voltage switching (ZVS) of main switch and zero-current switching (ZCS) of freewheeling diode are achieved at turn on and turn off without using any auxiliary circuits by the resonance between the parasitic capacitor and the coupled inductor. Furthermore, the peak voltages of the main switch and the peak current of the freewheeling diode are significantly reduced by the coupled inductor. As a result, the proposed converter has the advantages of simple circuit, convenient control, low consumption and so on. The detailed operation principles and steady-state analysis of the proposed ZVS-ZCS buck converter are presented, and detailed power loss analysis and some simulation results are also included. Finally, experimental results based on a 200-W prototype are provided to verify the theory and design of the proposed converter.

An Analysis of ZVS Phase-Shift Full-Bridge Converter's Small Signal Model according to Digital Sampling Method (ZVS 위상천이 풀브릿지 컨버터의 디지털 샘플링 기법에 따른 소신호 모델 분석)

  • Kim, Jeong-Woo;Cho, Younghoon;Choe, Gyu-Ha
    • The Transactions of the Korean Institute of Power Electronics
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    • v.20 no.2
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    • pp.167-174
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    • 2015
  • This study describes how digital time delay deteriorates control performance in zero voltage switching (ZVS) phase-shifted full bridge (PSFB) converter. The small-signal model of the ZVS PSFB converter is derived from the buck-converter small-signal model. Digital time delay effects have been considered according to the digital sampling methods. The analysis verifies that digital time delays reduce the stability margin of the converter, and the double sampling technique exhibits better performance than the single sampling technique. Both simulation and experimental results based on 250 W ZVS PSFB confirm the validity of the analyses performed in the study.

Zero-Voltage-Switching Boost Converter Using a Coupled Inductor

  • Do, Hyun-Lark
    • Journal of Power Electronics
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    • v.11 no.1
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    • pp.16-20
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    • 2011
  • This paper presents a zero-voltage-switching (ZVS) boost converter using a coupled inductor. It utilizes an additional winding to the boost inductor and an auxiliary diode. The ZVS characteristic of the proposed converter reduces the switching losses of the active power switches and raises the power conversion efficiency. The principle of operation and a system analysis are presented. The theoretical analysis and performance of the proposed converter were verified with a 100W experimental prototype operating at a 107 kHz switching frequency.

Steady-State Analysis of ZVS and NON-ZVS Full-Bridge Inverters with Asymmetrical Control for Induction Heating Applications

  • Yachiangkam, Samart;Sangswang, Anawach;Naetiladdanon, Sumate;Koompai, Chayant;Chudjuarjeen, Saichol
    • Journal of Power Electronics
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    • v.15 no.2
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    • pp.544-554
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    • 2015
  • This paper presents a steady-state operation analysis of full-bridge series-resonant inverters focusing on the distorted load current due to low-quality-factor resonant circuits in induction heating and other applications. The regions of operation based on the zero-voltage switching (ZVS) and non-zero-voltage switching (NON-ZVS) operations of the asymmetrical voltage-cancellation control technique are identified. The effects of a distorted load current under a wide range of output powers are also analyzed for achieving a precise ZVS operating region. An experimental study is performed with a 1kW prototype. Simulation and experimental studies have confirmed the validity of the proposed method. An efficiency comparison between the variable frequency method and the conventional fixed-frequency method is provided.