• Title/Summary/Keyword: snubber circuit

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The Study on the One-stage PFC-flyback Converter using the Soft Switching Technique (소프트 스위칭 기법을 이용한 1단 PFC-flyback 컨버터)

  • Lee, Sang-Hyeok;Hwang, Jung-Goo;Park, Sung-Jun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.3
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    • pp.263-269
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    • 2013
  • The flyback converter has been applied widely in isolated DC/DC power converters because this converters employ a single MOSFET switch. The leakage inductance should be minimized for high efficiency of flyback converter. but in reality, it is very difficult. Namely, The Snubber circuit is essential to recover the leakage inductance stored energy when the switch is turn off. Flyback Converter typically operates in DCM mode and when switch is turn off in hard switching, this hard switching action results in a high power losses and switching stresses. In order to overcome these problems, a novel soft switching flyback converter using resonant snubber circuit is proposed in this paper. The resonant snubber circuit is composed of the transformer leakage inductance and a capacitor. To verify and confirm the proposed resonant snubber circuit, PSIM simulation and hardware prototype are implemented. Simulation and Experimental results indicate that the proposed resonant snubber circuit is effective.

Soft-Switching PWM Boost Chopper-Fed DC-DC Power Converter with Load Side Auxiliary Passive Resonant Snubber

  • Nakamura, Mantaro;Ogura, Koki;Nakaoka, Mutsuo
    • Journal of Power Electronics
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    • v.4 no.3
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    • pp.161-168
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    • 2004
  • This paper presents a new circuit topology of high-frequency soft switching commutation boost type PWM chopper-fed DC-DC power converter with a loadside auxiliary passive resonant snubber. In the proposed boost type chopper-fed DC-DC power converter circuit operating under a principle of ZCS turn-on and ZVS turn-off commutation, the capacitor and inductor in the auxiliary passive resonant circuit works as the lossless resonant snubber. In addition to this, the voltage and current peak stresses of the power semiconductor devices as well as their di/dt or dv/dt dynamic stress can be effectively reduced by the single passive resonant snubber treated here. Moreover, it is proved that chopper-fed DC-DC power converter circuit topology with an auxiliary passive resonant snubber could solve some problems on the conventional boost type hard switching PWM chopper-fed DC-DC power converter. The simulation results of this converter are illustrated and discussed as compared with the experimental ones. The feasible effectiveness of this soft witching DC-DC power converter with a single passive resonant snubber is verified by the 5kW, 20kHz experimental breadboard set up to be built and tested for new energy utilization such as solar photovoltaic generators and fuel sell generators.

A Study on the Controllable Snubber for Switching Loss Reduction in Interleaved Fly-Back Converter (인터리브드 플라이 백 컨버터의 스위칭 손실 감소를 위한 제어형 스너버에 관한 연구)

  • Park, Chang-Seok;Jung, Tae-Uk
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.5
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    • pp.57-64
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    • 2015
  • This paper proposes a new switching algorithm for an controllable clamp snubber to improve the efficiency of a fly-back converter system. This system uses an controllable clamp method for the snubber circuit for the efficiency and reliability of the system. However, the active clamp snubber circuit has the disadvantage that system efficiency is decreased by switch operating time because of heat loss in resonance between the snubber capacitor and leakage inductance. To address this, this paper proposes a new switching algorithm. The proposed algorithm is a technique to reduce power consumption by reducing the resonance of the snubber switch operation time. Also, the snubber switch is operated at zero voltage switching by turning on the snubber switch before main switch turn-off. Experimental results are presented to show the validity of the proposed controllable clamp control algorithm.

A New Controllable Active Clamp Algorithm for Switching Loss Reduction in a Module Integrated Converter System

  • Park, Chang-Seok;Jung, Tae-Uk
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.4
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    • pp.465-471
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    • 2014
  • This paper proposes a new switching algorithm for an active clamp snubber to improve the efficiency of a module integrated converter system. This system uses an active clamp method for the snubber circuit for the efficiency and reliability of the system. However, the active clamp snubber circuit has the disadvantage that system efficiency is decreased by switch operating time because of heat loss in resonance between the snubber capacitor and leakage inductance. To address this, this paper proposes a new switching algorithm. The proposed algorithm is a technique to reduce power consumption by reducing the resonance of the snubber switch operation time. Also, the snubber switch is operated at zero voltage switching by turning on the snubber switch before main switch turn-off. Simulation and experimental results are presented to show the validity of the proposed new active clamp control algorithm.

A Study on the PFC(Power Factor Correction) boost converter applied Flying Capacitor Snubber. (Flying Capacitor Snubber를 적용한 PFC(Power Factor Correction) Boost 컨버터에 관한 연구)

  • Kim B.C.;Lee H.S.;Seo J.H.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.77-80
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    • 2003
  • Switching Mode Power Supply(SMPS) is widely used in many industrial fields. Power factor improvement and harmonic reduction technique are very important in SMPS. In this paper, we propose the circuit applied Flying Capacitor Snubber for improving power factor of boost converter on fast switching state. Snubber circuit consists of a inductor, two diodes and a capacitor. The losses of switching are reduced by inserting a snubber inductor in the series path of the boost switch and the rectifier diode to control the di/dt rate of the rectifier during it's turn-off. Prior to actual experiment, the circuit analysis Is implemented by PSPICE simulation.

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A Study on Quasi Resonant Converter with Low Switching Surge Voltage Characteristics by Applying Auxiliary Winding Type Active Snubber (보조 권선형 능동 스너버를 적용하여 낮은 스위치 서지 전압 특성을 갖는 유사 공진형 컨버터에 관한 연구)

  • Ahn, Tae Young
    • Journal of the Semiconductor & Display Technology
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    • v.17 no.4
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    • pp.56-61
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    • 2018
  • In this paper, a new type of active snubber was proposed to lower the excessive rated voltage of the clamp capacitor which was a problem in the conventional circuit by applying auxiliary winding into the active snubber. A simplified equivalent circuit of the proposed snubber was derived by applying it to QR flyback converter, and the equivalent circuits for each switch state was shown under the steady-state condition. In addition, the maximum voltage of the clamp capacitor as well as the main switch was found by using the steady-state equations. In particular, it was found that the clamp capacitor voltage could be controlled by the auxiliary winding ratio. In order to verify the utility and practicality of the proposed converter with auxiliary winding type active snubber circuit, a prototype with an output voltage of 19V and a maximum load current of 6A was produced and the results were reported.

A Generalized Undeland Snubber for Flying Capacitor 3-level Inverter (3-레벨 플라잉 커패시터 인버터를 위한 일반화된 Undeland 스너버 회로)

  • Kim, In-Dong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.5 no.4
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    • pp.746-755
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    • 2001
  • This paper proposes a snubber circuit for flying capacitor 3-level inverter and converter. The proposed snubber circuit makes use of Undeland snubber as basic snubber unit. It has such an advantage of Undeland snubber used in the two-level inverter. Compared with conventional RLD/RCD snubber for 3-level inverter and converter, the proposed snubber keeps such good features as fewer number of components, reduction of voltage stress of main switching devices due to low overvoltage, and improved efficiency of system due to low snubber loss. In this paper, the proposed snubber is applied to multilevel flying capacitor inverter and its feature is demonstrated by computer simulation and experimental result.

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Soft-Switching Boost Chopper Type DC-DC Power Converter with a Single Auxiliary Passive Resonant Snubber

  • Nakamura Mantaro;Myoui Takeshi;Abudullh Al Mamun;Nakaoka Mutsuo
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.256-260
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    • 2001
  • This paper presents boost and buck and buck-boost DC-DC converter circuit topologies of high-frequency soft switching transition PWM chopper type DC-DC high power converters with a single auxiliary passive resonant snubber. In the proposed boost power converter circuits operating under a principle of ZCS turn-on and ZVS turn-off commutation schemes, the capacitor and inductor in the auxiliary passive resonant circuit works as the loss less resonant snubber. In addition to this, the switching voltage and current peak stresses as well as EMI and RFI noises can be basically reduced by this single passive resonant snubber. Moreover, it is proved that converter circuit topologies with a passive resonant snubber are capable of solving some problems of the conventional hard switching PWM processing based on high-ferquency pulse modulation operation principle. The simulation results of this converter are discussed as compared with the experimental ones. The effectiveness of this power converter with a single passive resonant snubber is verified by the 5kW experimental breadboad set up.

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A New ZVT-PWM Converter using Active Resonant Snubber (액티브 공진 스너버를 이용한 새로운 ZVT-PWM 컨버터)

  • Park, J.M.;Yoon, Y.T.;Kim, C.Y.;Kim, D.W.;Park, S.W.;Mun, S.P.;Suh, K.Y.
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.262-265
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    • 2003
  • In this paper, a new active snubber circuit that overcomes most of the drawbacks of the normal "zero voltage transition pulse width modulation" (ZVT-PWM) converter is proposed to contrive a new family of ZVT- PWM converter. A converter with the proposed snubber circuit can also operate at light load conditions. A design procedure of the proposed active snubber circuit is also presented. Additionally, at full output power in the proposed soft switching converter, the main switch loss is about 27[%] and the total circuit loss is about 36[%] of that in its counterpart hard switching converter, and so the overall efficiency, which is about 91[%] in the hard switching case, increases to about 97[%].

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The High Power AC-DC Buck Converter of High Efficienty Using Loss-Less Snubber (로스레스 스너버를 사용한 고효율의 대용량 AC-DC 강압형 컨버터)

  • 문상필;서기영;이현우
    • Proceedings of the IEEK Conference
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    • 1998.06a
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    • pp.951-954
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    • 1998
  • This paper proposed that a high power AC-DC buck converter topology of high efficiency using loss-less snubber operates with four chopper connecting a number of parallel circuit. To improve these, a large number of soft switching topologies included a resonant circuit have been proposed. And, some simulative resutls on computer is included to confirm the validity of the analytical results. The partial resonant circuit makes use of a inductor using step-down and a condenser of loss-less snubber. The result is that the switching loss is very low and the efficiency of system is high. And the snubber condenser used in partial resonant circuit makes charging energy regenerated at input power source of rresonant operation. The proposed conversion system is deemed the most suitable for high power applications where the power switching devices are used.

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