• 제목/요약/키워드: Leakage inductance

검색결과 242건 처리시간 0.024초

넓은 입력전압 범위에서 동작하는 비대칭 하프브리지 방식의 플라이백 컨버터 (Asymmetrical Half-bridge Flyback Converter with Universal Input Voltage Range)

  • 유두희;이재민;정강률
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2007년도 추계학술대회 논문집
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    • pp.124-126
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    • 2007
  • This paper presents an asymmetrical half-bridge flyback converter with universal input voltage range. The leakage inductance and output capacitance of active switches are used to realize zero voltage switching(ZVS) operation during the transition state between two switches. In this paper, the operating principle and system analysis of the adopted converter are discussed in detail. A 5V/20A prototype has been implemented to verify the proposed topology and theoretical operation under various load condition and universal input voltage range.

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An Isolated High Step-Up Converter with Non-Pulsating Input Current for Renewable Energy Applications

  • Hwu, Kuo-Ing;Jiang, Wen-Zhuang
    • Journal of Power Electronics
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    • 제16권4호
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    • pp.1277-1287
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    • 2016
  • This study proposes a novel isolated high step-up galvanic converter, which is suitable for renewable energy applications and integrates a boost converter, a coupled inductor, a charge pump capacitor cell, and an LC snubber. The proposed converter comprises an input inductor and thus features a continuous input current, which extends the life of the renewable energy chip. Furthermore, the proposed converter can achieve a high voltage gain without an extremely large duty cycle and turn ratio of the coupled inductor by using the charge pump capacitor cell. The leakage inductance energy can be recycled to the output capacitor of the boost converter via the LC snubber and then transferred to the output load. As a result, the voltage spike can be suppressed to a low voltage level. Finally, the basic operating principles and experimental results are provided to verify the effectiveness of the proposed converter.

누설인덕턴스 가변형 공통모드 초크코일 (A Variable Leakage Inductance Common-Mode Choke)

  • 백미란;김희승;원재선;주재철;오동성;한상규;홍성수
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2011년도 전력전자학술대회
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    • pp.402-403
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    • 2011
  • EMI 필터 설계 시 주로 사용되는 공통모드 초크의 경우 자화 인덕턴스로부터 공통모드 노이즈 감쇠를, 누설 인덕턴스로부터 차동모드 노이즈 감쇠를 기대할 수 있다. 이때, 누설인덕턴스가 너무 클 경우 차동모드 노이즈 감쇠에는 우수하지만, 전기/전자제품이 슬림화됨에 따라 공통모드 초크의 누설 자속과 전원공급기를 덮고 있는 금속덮개 사이에 자계 간섭에 의한 진동/소음문제가 발생될 수 있다. 본 논문에서는 누설자속을 조절할 수 있는 공통모드 초크의 코어형상 및 권선기법을 제안한다. 제안된 방법은 진동 및 소음을 제어할 수 있는 장점을 지니고 있다.

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소형 변압기 권선의 누설인덕턴스 계산 (Calculation of Leakage Inductance in a small size Transformer Winding)

  • 정현구;우성현;장형택;김영배;신판석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.632_633
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    • 2009
  • 변압기의 설계에서 누설인덕턴스는 설계파라미터의 중요한 요소 중에 하나이다. 변압기 권선의 누설자속은 전압강하, 자속의 손실 및 변압기의 효율적 설계 면에서 중요하다. 본 논문은 동심원 권선의 누설임피던스의 계산을 1)수치적인 계산과 2)저장에너지를 이용한 계산 및 3)FEM해석(FLUX2D)을 통하여 누설인덕턴스를 계산하여 각각의 결과를 비교하였다. 누설인덕턴스의 계산 예로 단상 2kVA/220V의 변압기를 모델로 계산 및 해석을 수행하였다.[1][2]

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High Step-Up Converter with Hybrid Structure Based on One Switch

  • Hwu, K.I.;Peng, T.J.
    • Journal of Electrical Engineering and Technology
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    • 제10권4호
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    • pp.1566-1577
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    • 2015
  • A novel high step-up converter is presented herein, which combines the conventional buck-boost converter, the charge pump capacitor and the coupling inductor. By doing so, a quite high voltage conversion ratio due to not only the turns ratio but also the duty cycle, so as to increase design feasibility. It is noted that the denominator of the voltage conversion ratio is the square of one minus duty cycle. Above all, there is no voltage spike across the switch due to the leakage inductance and hence no passive or active snubber is needed, and furthermore, the used switch is driven without isolation and hence the gate driving circuit is relatively simple, thereby upgrading the industrial application capability of this converter. In this paper, the basic operating principles and the associated mathematical deductions are firstly described in detail, and finally some experimental results are provided to demonstrate the effectiveness of the proposed high step-up converter.

능동 클램프형 전류형 단상 풀브리지 DC-DC 컨버터의 동작 해석 (Analysis of Current Fed Full Bridge DC-DC Converter with Active Clamp)

  • 차한주;최순호;안치형
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.205-207
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    • 2007
  • Isolated Current fed full-bridge converter with active clamp is analyzed in this paper. An active clamp branch is used for limiting the voltage overshoot in the bridge switches and rectifier diodes. Zero voltage switching(ZVS) is also realized by using the energy stored in the transformer leakage inductance. To analyze the converter, 6 modes of operation are introduced and investigated. For each of the modes, voltage and current equations are derived together with corresponding equivalent circuits. 200W prototype dc-dc converter is assembled and verifies the effectiveness of the analysis and simulation.

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전력변환장치를 이용한 상용차용 무시동 에어컨 압축기 시스템 (Commercial Vehicle Anti-Start Air Conditioner Compressor System Using a Power Conversion Unit)

  • 한근우;김성곤;이충훈;최명현;정영국;임영철
    • 조명전기설비학회논문지
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    • 제29권6호
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    • pp.96-108
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    • 2015
  • his study deals with a power conversion unit of an anti-start air conditioner compressor system for the commercial vehicle. In case of converter, to reduce the switching losses and current stresses of the device, applies LLC resonant topology. Transformer leakage inductance in the full-bridge converter is used for making the resonance with the capacitor of the voltage-doubler. Through this method we can increase power and decrease volume of system. Both circuit analysis and design guideline are described. So in this paper, power conversion unit is designed. 2.5kW anti-start air conditioner compressor system was implemented, and system operation and stability was verified through experiment.

고주파 변압기 차폐에 따른 EMI 방사 노이즈 저감에 관한 연구 (Reduction of Radiated Noise of EMI using Shielding Methods of High Frequency Transformer)

  • 이완윤;정교범
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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    • pp.811-814
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    • 2004
  • Radiated noise from high frequency transformers (HTFs) of switching mode power supply is mainly caused by the leakage inductance and the parasitic capacitance of HTFs. Generally, the radiated noise can be reduced by adding snubbers to switching power circuits or shielding HTFs. Radiated noise, however, is mainly affected by the shielding method. In this paper, the various shielding methods to reduce the radiated noise of EMI are analyzed, compared in the experimental studies. And it is proved that the radiated noise can be reduced according to the shielding methods of HFTs and the electrical connection between shields and power circuit.

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마이크로그리드용 순간정전발생기의 순간정전모드 동작시 전류특성 해석 (Analysis of current characteristics of outage generator for microgrid in outage mode operation)

  • 이영호;민병호;노의철;김인동;전태원;김흥근
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2008년도 하계학술대회 논문집
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    • pp.130-132
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    • 2008
  • This paper describes the current characteristics of outage generator for microgrid in outage mode operation. The outage can be generated with 3-phase voltage disturbance generator. The STS current becomes very huge during the first cycle of the outage, and the magnitude of the current depends on the time impedance, series transformer leakage inductance, interfacing reactor of PCS, and the maximum allowable PCS output current. The current and load voltage waveform are analysed through simulation.

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마그네트론 구동용 단일단 공진형 전원장치 (Single Stage Resonant Power Supply for Driving Magnetron Device)

  • 정진범;연재을;김희준
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제53권10호
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    • pp.625-633
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    • 2004
  • This paper proposed a boost input type single stage resonant power supply for driving magnetron device. The proposed power supply can control both input power factor and output power at the same time. Also, because ZVS is achieved using the resonance between leakage inductance and resonant capacitance, switching losses are drastically reduced. To prevent breakdown or moding phenomenon of the magnetron due to excessive starting voltage, variable frequency ignition method is also proposed. Experimental results for the prototype power supply are presented and discussed to verify the validity of the proposed power supply.