• Title/Summary/Keyword: FB DC/DC Converter

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Full-Digital Controlled High Power Soft Switching DC/DC Converter for Resistance Welding (저항용접용 풀-디지털제어 대용량 소프트 스위칭 DC/DC 켄버터)

  • 김은수;김태진;변영복;조기연;조상명
    • Proceedings of the KWS Conference
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    • 2000.04a
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    • pp.99-102
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    • 2000
  • Conventionally, ZVS FB DC/DC converter was controlled by monolithic IC UC3879, which includes the functions of oscillator, error amplifier and phase-shift circuit. Also, microprocessor and DSP have been widely used for the remote control and for the immediate waveform control in ZVS FB DC/DC converter. However the conventional microprocessor controller is complex and difficult to control because the controller consists of analog and digital parts. In the case of the control of FB DC/DC converter, the output is required of driving a direct signal to the switch drive circuits by the digital controller. So, this paper presents the method and realization of designing the digital-to-phase shift PWM circuit controlled by DSP (TMX320C32) in a 2,500A, 40㎾ WS FB DC/DC converter.

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Digital-To-Phase-Shift PWM Circuit for High Power ZVS Full Bridge DC/DC Converter (대용랑 ZVS Full Bridge DC/DC 컨버터에 있어서 Digital-To-Phase Shift PWM 발생회로)

  • Kim, Eun-Su;Kim, Tae-Jin;Byeon, Yeong-Bok;Park, Sun-Gu;Kim, Yun-Ho;Lee, Jae-Hak
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.1
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    • pp.54-61
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    • 2000
  • Conventionally, ZVS FB DC/DC converter was controlled by monolithic IC UC3879, which includes the functions of oscillator, error amplifier and phase-shift circuit. Also, microprocessor and DSP have been widely used for the remote control and for the immediate waveform control in ZVS FB DC/DC converter. However the conventional microprocessor controller is complex and difficult to control because the controller consists of analog and digital parts. In the case of the control of FB DC/DC converter, the output is required of driving a direct signal to the switch drive circuits by the digital controller. So, this paper presents the method and realization of designing the digital-to-phase shift PWM circuit controlled by DSP (TMX320C32) in a 2,500A, 40㎾ ZVS FB DC/DC converter.

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An Improved ZVZCS PWM FB DC/DC Converter Using the Modified Clamp Circuit (개선된 Clamp Circuit 적용 ZVZCS FB DC/DC 컨버터)

  • 김은수;조기연;김윤호;이진수
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.643-645
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    • 1999
  • The conventional high frequency phase-shifted full bridge dc/dc converter has a disadvantage that a circulating current flows through transformer and switching devices during the freewheeling interval. Due to this circulating current, RMS current stress, conduction losses of transformer and switching devices are increased. To alleviate this problem, this paper provides a circulating current free type high frequency soft switching phase-shifted full bridge (FB) dc/dc converter with the modified energy recovery snubber (ERS) attached at the secondary side of transforemr.

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A Study on the Development of A 13kW High Frequency ZVS FB DC-DC Converter (13kW급 고주파 ZVS FB DC-DC 콘버터 개발)

  • Kim, Eun-Soo;Joe, Kee-Yeon;Lee, Jae-Hun
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.542-546
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    • 1994
  • The objective of the study is to design and develope a 13kW zero voltage switching DC-DC Converter far high power application. Due to using the snubber capacitor in the right leg instead of increasing transformer leakage inductance, DC characteristics and the total efficiency in the proposed ZVS DC-DC converter is increased mere than in the conventional ZVS DC-DC converter by reduction of the circulating current when the load current is large. Also, this paper includes simulation and experimental results of the proposed ZVS FB DC-DC converter.

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Analysis of a FB-ZVS PWM DC/DC Converter for Electric Vehicles (전기자동차용 FB-ZVS PWM DC/DC 변환기의 해석)

  • Lee, Dong-Keun;Yoon, Duck-Yong;Hong, Soon-Chan
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.461-463
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    • 1996
  • A FB-ZVS(Full Bridge Zero Voltage Switching) PWM DC/DC converter for electric vehicles is analyzed in this paper. The converter considered is a step-down DC/DC converter with the ratings of 3l2/I3.5V and 1.35kW. The steady state analysis of this converter is divided into six operating modes. Digital simulations using PSPICE are carried out to verify the steady-state analysis.

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DC Bias Control of High Frequency Transformer in High Power FB DC/DC Converter (대용량 FB DC/DC 컨버터에 있어서 고주파변압기 편 여자 현상 및 제어)

  • 김태진
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.45-48
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    • 2000
  • By the use of he DSP and microprocessor controller many high power converter such as especially inverter and motor drive system may be enhanced resulting in the improved robustness of EMI the ability to communicate the operating conditions and the ease of adjusting the control parameters. However the digital controller using DSP or microprocessor has not been applied in the high frequency switching power supplies especially in full bridge dc/dc converters. this paper presents a promising solution to the dc bias control problem of high frequency transformer in high power full bridge converter.

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A Study on the FB-ZVS DC/DC Converter for Auxiliary Power Supply in Electric Vehicles (전기자동차 보조전원용 FB-ZVS 직류-직류 변환기에 관한 연구)

  • Lee, Dong-Keun;Yoon, Duck-Yong;Hong, Soon-Chan
    • Proceedings of the KIEE Conference
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    • 1996.11a
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    • pp.363-366
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    • 1996
  • A FB-ZVS(Full Bridge Zero Voltage Switching) PWM DC/DC converter for electric vehicles is simulated and implemented in this paper. The converter considered is a step-down DC/DC converter with the ratings of 312/13.5V and 1.35kW. The steady state operation of this converter is divided into six operating modes in case of continuous current mode and eight operating modes in case of discontinuous current mode. Digital simulations using PSpice are carried out to verify the steady-state analysis. A prototype converter was built in the laboratory. MOSFETs were used for swithching devices and fast recovery diodes to reduce the charge storage problem of a pn-junction.

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Novel soft switching FB DC-DC converter (새로운 소프트 스위칭 FB DC-DC 컨버터)

  • 김은수;최해영;조기연;계문호;김윤호
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.251-255
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    • 1997
  • The conventional high frequency phase-shifted full bridge dc/dc converter has a disadvantage that a circulating current flows through transformer and switching devices during the freewheeling interval. Due to this circulating current, RMS current stress, conduction losses of transformer and switching devices are increased. To alleviate this problem, this paper provides a circulating current free type high frequency soft switching phase-shifted full bridge (FB) dc/dc converter with energy recovery snubber (ERS) attached at the secondary side of transformer. The energy recovery snubber (ERS) adopted in this study is consisted of three fast recovery diode(Ds1, DS2, Ds3), two resonant capacitor (Cs1, Cs2)

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The Constant Output Power Control of SSRT FB DC-DC Converter by an Improved Phase-shift Control (개선된 위상 천이 제어에 의한 소프트 스위칭 공진형 FB DC-DC 컨버터의 정출력 제어)

  • 신동률;조용길;김동완;우정인
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.14 no.5
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    • pp.27-35
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    • 2000
  • This paper deals with a control strategy for constant output power of SSRT(Soft Switching Resonant Type) FB(Full Bridge) DC-DC converter by an improved phase shift controller. When the FB DC-DC converter for the high density and the high effect control is operated in high speed switching, the switching loss and switching stress of the switching devices are increased. So, the soft switching method, which has the phase shift control with the digital I-PD controller, must be use in order to reduce its. And the output voltage that controlled by the digital I-PD controller tracks a reference without steady state error in variable input voltage. The validity of control strategy that proposed is verified from simulation results and experimental results by the DSP(TMS320C32).

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Dynamic Analysis and Control-Loop Design of ZVS-FB PWM DC/DC Converter for High-Power Applications (대용량 ZVS-FB PWM DC/DC 변환기의 제어 루프 설계와 동특성 해석)

  • Yoon, Kil-Moon;Baek, Ju-Won;Cha, Young-Kil;Kim, Heung-Geun
    • Proceedings of the KIEE Conference
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    • 1997.07f
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    • pp.2023-2027
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    • 1997
  • This paper presents the dynamic analysis and control-loop design of a zero-voltage-switched full bridge (ZVS-FB) PWM dc/dc converter. Based on the small-signal analysis results, the control-loop is designed using a simple two-pole one-zero compensation circuit. Design results are verified by both computer simulations and experimental data obtained from a 2kW prototype converter.

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