• Title/Summary/Keyword: Zero current soft switching

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A Novel Soft Switching PWM·PFC AC·DC Boost Converter

  • Sahin, Yakup
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.256-262
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    • 2018
  • This study introduces a novel Soft Switching (SS) Pulse Width Modulated (PWM) AC-DC boost converter. In the proposed converter, the main switch is turned on with Zero Voltage Transition (ZVT) and turned off with Zero Current Transition (ZCT). The main diode is turned on with Zero Voltage Switching (ZVS) and turned off with Zero Current Switching (ZCS). The auxiliary switch is turned on and off with ZCS. All auxiliary semiconductor devices are turned on and off with SS. There is no extra current or voltage stress on the main semiconductor devices. The majority of switching energies are transferred to the output by auxiliary transformer. Thus, the current stress of auxiliary switch is significantly reduced. Besides, the proposed converter has simple structure and ease of control due to common ground. The theoretical analysis of the proposed converter is verified by a prototype with 100 kHz switching frequency and 500 W output power. Furthermore, the efficiency of the proposed converter is 98.9% at nominal output power.

A Family of Zero Current and Zero Voltage Switching Bidirectional DC-DC Converter with Soft Switched Auxiliary Circuit (소프트 스위칭 방식의 보조 회로를 갖는 영전류 및 영전압 스위칭 양방향 DC-DC 컨버터)

  • Lee, Il-Ho;Kim, Jun-Gu;Kim, Jae-Hyung;Won, Chung-Yuen;Jung, Yong-Chae
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.438-439
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    • 2011
  • In this paper, soft switching bidirectional DC-DC converter is proposed. The proposed topology is added two auxiliary switches, two resonant capacitors and one resonant inductor to convectional bidirectional DC-DC converter. Therefore, this proposed topology can reduce switching loss of each power switch by ZVS (Zero Voltage Switching) and ZCS (Zero Current Switching). We have performed mode analysis, simulation and experiment for the proposed topology.

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An Employed Zero Voltage/Zero Current Switching Commutation Cell for All Active Switches in a PWM DC/DC Converter

  • Lee, Dong-Yun;Hyun, Dong-Seok
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.2B no.4
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    • pp.183-190
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    • 2002
  • This paper presents an improved Zero Voltage/Zero Current Switching (ZVZCS) commutation cell with minimum additional components, which provides soft switching at both turn-on and turn-off of main and auxiliary switches as well as diodes in a PWM DC/DC converter. The proposed soft-switching technique is suitable for not only minority, but also majority carrier semiconductor devices. The auxiliary switch of the proposed ZVZCS commutation cell is in parallel with the main switch, and therefore, the main switch and the diode are free of currentstress. The operation principles of the proposed ZVZCS commutation cell are theoretically analyzed using the PWM boost converter topology as an example. The validity of the PWM boost converter topology with the proposed ZVZCS commutation cell is verified through theoretical analysis, simulation and experimental results.

A New High Power Factor ZVT-ZCT AC-DC Boost Converter

  • Ting, Naim Suleyman
    • Journal of Electrical Engineering and Technology
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    • v.13 no.4
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    • pp.1539-1548
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    • 2018
  • This paper introduces a new soft switched AC-DC boost converter with power factor correction (PFC). In the introduced converter, all devices are turned on and off under soft switching (SS). The main switch is turned on under zero voltage transition (ZVT) and turned off under zero current transition (ZCT). The main diode is turned on under zero voltage switching (ZVS) and turned off under zero current switching (ZCS). Meanwhile, there is not any current or voltage stress on the main devices. Besides, the auxiliary switch is turned on under ZCS and turned off under ZVS. The detailed theoretical analysis of the converter is presented, and also theoretical analysis is verified by a prototype with 100 kHz and 500 W. Also, the proposed converter has 99.8% power factor and 97.5% total efficiency at soft switching operation.

Three-Phase Current Source Type ZVS-PWM Controlled PFC Rectifier with Single Active Auxiliary Resonant Snubber and Its Feasible Evaluations

  • Masayoshi Yamamoto;Shinji Sato;Tarek Ahmed;Eiji Hiraki;Lee, Hyun-Woo;Mutsuo Nakaoka
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.4B no.3
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    • pp.127-133
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    • 2004
  • This paper presents a prototype of three-phase current source zero voltage soft-switching PWM controlled PFC rectifier with Single Active Auxiliary Resonant Commutated Snubber (ARCS) circuit topology. The proposed three-phase PFC rectifier with sinewave current shaping and unity power factor scheme can operate under a condition of Zero Voltage Soft Switching (ZVS) in the main three phase rectifier circuit and zero current soft switching (ZCS) in auxiliary snubber circuits. The operating principle and steady-state performances of the proposed three-phase current source soft-switching PWM controlled PFC rectifier controlled by the DSP control implementation are evaluated and discussed on the basis of the experimental results of this active rectifier setup.

Efficiency Improvement of New Soft Switching Type Buck-Boost Chopper (새로운 소프트 스위칭형 벅-부스터 컨버터의 효율개선)

  • 고강훈;곽동걸;서기영;권순걸;이현우
    • Proceedings of the KIPE Conference
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    • 1998.11a
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    • pp.44-48
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    • 1998
  • In the buck-boost DC-DC converter which is used at a certain situation such as in factories where loads often change a lot, the switches in the device make big energy loss in operating at Buck-Boost Mode due to hard switching and are affected by lots of stresses which decrease the efficiency rate of the converter. In order to improve this problem, to decrease the loss of snubber and switching, it has been investigated that zero voltage switching mode and zero current switching mode which make the operation of switches with soft switching. For the more sophisticated and advanced device, this paper is presented the Partial Resonant Soft Switching Mode Power Converter which is adapted the power converter having the partial resonant soft switching mode, that makes switches operate when the resonant current or voltage becomes zero by making the resonant circuit partially at turning on and off of the switches with suitable layout of the resonant elements and switch elements in the converter. Also, this paper includes the analysis and simulation of the Partial Resonant type Buck-Boost Chopper.

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A Zero-Current-Zero-Voltage-Transition Flyback Converter using Auxiliary Circuit (보조 회로를 활용한 ZCZVT 소프트 스위칭 플라이백 컨버터)

  • Ju, Hyeon-Seung;Choi, Hyun-Chil
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.6
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    • pp.397-402
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    • 2018
  • In this study, a high-efficiency flyback converter that uses a soft-switching auxiliary circuit is proposed. The structure of the proposed converter adds an inductor, switch, diode, and capacitor to the conventional flyback converter. The switch in the auxiliary circuit and the main switch are turned on and off under soft-switching conditions. Therefore, the switching losses of the proposed flyback converter are considerably smaller than those of conventional flyback converters. The performance of the proposed flyback converter is validated by experiments on a 100 W single-output flyback converter prototype, and design guidelines are presented.

Zero voltage and zero current switched converters (영전압 영전류 스위칭 방식의 컨버터)

  • 정규범
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 1998.11a
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    • pp.120-124
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    • 1998
  • In this paper, new zero voltage and zero current switched PWM(Pulse Width Modulated) converters are suggested. The main and auxiliary switch of the converters satisfy soft switching conditions, which are zero voltage or zero current switching of the switches. The switching characteristics of the proposed converters are experimentally verified by boost typed converter, which has 250 kHz switching frequency. For the 250 kHz operation, turn on period of auxiliary switch is about 1/40 for switching period of 4 ${\mu}\textrm{s}$. Therefore, the conduction loss of auxiliary switch is reduced.

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A Study on High Efficiency Boost DC-DC Converter of Discontinuous Current Mode Control (전류불연속 제어의 고효율 부스트 DC-DC 컨버터에 관한 연구)

  • Kwak Dong-Kurl;Kim Choon-Sam
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.9
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    • pp.431-436
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    • 2005
  • This paper studies a novel boost DC-DC converter operated high efficiency for discontinuous current mode (DCM) control. The converter worked in DCM eliminates the complicated circuit control requirement, reduces a number of components, and reduces the used reactive components size. In the general DCM converter, the switching devices are turned-on the zero current switching (ZCS), and the switching devices must be switched-off at a maximum reactor current. To achieve the zero voltage switching (ZVS) at the switching turn-off, the proposed converter is constructed by using a new loss-less snubber circuit. Soft-switched operation of the proposed boost converter is verified by digital simulation and experimental results. A new boost converter achieves the soft-switching for all switching devices without increasing their voltage and current stresses. The result is that the switching loss is very low and the efficiency of boost DC-DC converter is high.

Analysis, Design, and Implementation of a Zero-Voltage-Transition Interleaved Boost Converter

  • Ting, Naim Suleyman;Sahin, Yakup;Aksoy, Ismail
    • Journal of Power Electronics
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    • v.17 no.1
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    • pp.41-55
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    • 2017
  • This study proposes a novel zero voltage transition (ZVT) pulse width modulation (PWM) DC-DC interleaved boost converter with an active snubber cell. All the semiconductor devices in the converter turn on and off with soft switching to reduce the switching power losses and improve the overall efficiency. Through the interleaved approach, the current stresses of the main devices and the ripple of the output voltage and input current are reduced. The main switches turn on with ZVT and turn off with zero voltage switching (ZVS). The auxiliary switch turns on with zero current switching (ZCS) and turns off with ZVS. In addition, the snubber cell does not create additional current or voltage stress on the main switches and main diodes. The proposed converter can smoothly achieve soft switching characteristics even under light load conditions. The theoretical analysis and operating stages of the proposed converter are made for the D > 50% and D < 50% modes. Finally, a prototype of the proposed converter is implemented, and the experimental results are given in detail for 500 W and 50 kHz. The overall efficiency of the proposed converter reached 95.5% at nominal output power.