• Title/Summary/Keyword: active clamp

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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 a Boost-Input Self-Driven Active Clamp ZVS Converter (자기구동 능동 클램프를 이용한 부스트 입력형 ZVS 컨버터에 관한 연구)

  • Jin, Ho-Sang;Kim, Hee-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.4
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    • pp.781-788
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    • 2011
  • This paper proposes a boost-input self-driven active clamp ZVS converter eliminating the extra dirve circuit for the active clamp switch. The converter used the auxiliary winding of the transformer to drive the active clamp switch and to achieve asymmetrical duty control. This paper presents the operation principle and the analyzed results of dynamic characteristics including steady state characteristics of the converter proposed. The experimental results were used to verify the theoretical predictions. A 300W (15V/20A) prototype converter that only exhibited 2-turn winding number in the auxiliary winding was sufficient to drive the active clamp switch on the input voltage of 80V. Finally, the maximum efficiency of 91.2% was achieved for the prototype converter and the proposed converter had stable closed loop characteristic with phase margin $55^{\circ}$.

A Self-Driven Active Clamp Forward Converter Using the Auxiliary Winding of the Power Transformer (변압기 보조권선을 이용한 자기 구동 능동 클램프 포워드 컨버터)

  • 이광운;임범선;김희준
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.40 no.5
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    • pp.350-354
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    • 2003
  • This study proposes a new self-driven active clamp forward converter eliminating the extra drive circuit for the active clamp switch. The converter used the auxiliary winding of the power transformer to drive the active clamp switch and a simple R-C circuit to get the dead time between the two switches. The operation principle was presented and experimental results were used to verify theoretical predictions. A 100-W (5V/20A) prototype converter built that only exhibited 1.5-turn winding number in the auxiliary winding was sufficient to drive the active clamp switch on the input of 50V. Finally, the measured efficiency of the converter was presented and the maximum efficiency of 91% was obtained.

A Novel Active Clamp Switching Method To Improve of Efficiency For Photovoltaic MIC (태양광 MIC 시스템의 효율향상을 위한 새로운 Active Clamp 스위칭 기법)

  • Park, Byung-Chul;Park, Ji-Ho;Song, Sung-Geun;Park, Sung-Jun;Shin, Joong-Rin
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.5
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    • pp.477-484
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    • 2013
  • This paper proposes a novel switching method of active clamp snubber for efficiency improvement of PV module integrated converter(MIC) system. Recently, MIC solar system is researched about the efficiency and safety. PV MIC system is used active clamp method of snubber circuit for the price and reliability of the system. But active clamp snubber circuit has the disadvantage that system efficiency is decreased for switch operating time because of heat loss of resonant between snubber capacitor and leakage inductance. To solve this problem, this paper proposes a novel switching method of the active clamp. The proposed method is a technique to reduce power consumption by reducing the resonance of the snubber switch operation time and through simulations and experiments proved the validity.

A Fuel Cell Generation System with a New Active Clamp Sepic-Flyback Converter

  • Lee, Won-Cheol;Jang, Su-Jin;Kim, Soo-Seok;Lee, Su-Won;Won, Chung-Yuen
    • Journal of Power Electronics
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    • v.9 no.1
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    • pp.26-35
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    • 2009
  • A high efficiency active clamp sepic-flyback converter is presented for fuel cell generation systems. The proposed converter is a superposition of a sepic converter mode and. flyback converter mode. The output voltages of the sepic converter mode and flyback converter mode can be regulated by the same PWM technique with constant frequency. By merging the sepic and flyback topologies, they can share the transformer, power MOSFET and active clamp circuit. The result has outstanding advantages over conventional active clamp DC-DC converters: high efficiency, high power density, and component utilization. Simulation results and experimental results are presented to verify the principles of operation for the proposed converter.

A Study on Switching Characteristics of Active Clamp Type Flyback Converter with Synchronous Rectifier Driving Signals Controlling Auxiliary Switch (보조스위치가 동기정류기 구동 신호로 제어되는 능동 클램프형 플라이백 컨버터의 스위칭 특성에 관한 연구)

  • Ahn, Tae Young
    • Journal of the Semiconductor & Display Technology
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    • v.17 no.3
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    • pp.21-26
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    • 2018
  • In this paper, the switching characteristics of the active clamp type flyback converter, which is deemed suitable for the miniaturization of the external power supply for home appliance, were analyzed and the process of reducing the switching loss was explained. The active clamp type flyback converter operating in the DCM has confirmed that the surge voltage of the main switch does not occur and the turn-off / on loss of the switch do not occur in principle. Also, in the case of the switch for synchronous rectifier, it was showed that the switch current showed half-wave rectified sinusoidal characteristic, and the switching loss was reduced. The switching characteristics of the experimental results gathered from 120 W class prototype were compared with the theoretical waveform in the steady-state and it was confirmed that the power conversion efficiency of the active clamp type flyback converter was maintained high due to the reduction of the switching loss.

Active-clamp Class-E High Frequency Resonant Inverter with Single-st (단일 전력단으로 구성된 Active-clamp E급 고주파 공진 인버터)

  • Kang, Jin-Wook;Won, Jae-Sun;Kim, Dong-Hee;Ro, Chae-Gyun;Sim, Kwang-Yeal;Le, Bong-Sub
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.1193-1195
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    • 2002
  • This paper presents Active-clamp Class-E high frequency resonant inverter with single-stage. The proposed circuit is integrated Active-c class-E circuit to boost converter with the funct power factor correction. Boost converter is opera positive and negative half cycle respectively at frequency(60Hz), operating in Discontinuous Con Mode(DCM) of boost converter performs high p factor. By adding active-clamp circuit in Cl inverter, main switch of inverter part is operat only ZVS(Zero Voltage Switch), but also reduce switching voltage stress of main switch. Simulation result using Psim4.1 show that the p prove the validity of theoretical analysis. This proposed inverter will be able to be pract used as a power supply in various fields are ind heating applications, DC-DC converter etc.

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A Characteristic Estimation of Current fed Push Pull Type High Frequency Resonant DC-DC Converter with Active Clamp Circuits (능동클램프회로를 갖는 전류공급 Push-Pull형 고주파공진 DC-DC 컨버터의 특성평가)

  • 오경섭;남승식;김동희
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.8
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    • pp.517-524
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    • 2004
  • In this paper, a novel zero-voltage-switching(ZVS) resonant DC-DC converter is proposed. It is composed of two symmetrical active-clamped circuits, the converter can be achieve ZVS in each switches. Also, active clamp capacitor ratios($\alpha$) of proposed circuit can be reduce a peak stress of switching voltage for each main switch. Simulation results using Pspice 9.2 ver and $C^{++}$ characteristic analysis show a provement for the validity of theoretical analysis. The analysis of the proposed Current-Fed Push Pull type DC-DC converter is generally described by using normalized parameter, and achieved an evaluated characteristic values which is needed to design a circuit. We confirm a rightfulness theoretical analysis by comparing a theoretical values and experimental values obtained from experiment using MOSFET as switching devices.

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.

Characteristic Estimation of Single-Stage Active-Clamp Type High Frequency Resonant Inverter (단일 전력단 능동 클램프형 고주파 공진 인버터의 특성 평가)

  • 원재선;강진욱;김동희
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.2
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    • pp.114-122
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    • 2004
  • This paper presents a novel single-stage active-clamp type high frequency resonant inverter. The proposed topology is integrated full-bridge boost rectifier as power factor corrector and active-clamp type high frequency resonant inverter into a single-stage. The input stage of the full-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. By adding additional active-clamp circuit to conventional class-E high frequency resonant inverter, main switch of inverter part operates not only at Zero-Voltage-Switching mode but also reduces the switching voltage stress of main switch. Simulation results have demonstrated the feasibility of the proposed high frequency resonant inverter. Characteristics values based on characteristics estimation 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 the fields of induction heating applications, fluorescent lamp and DC-DC converter etc.