ZVZCS가 가능한 LLC AC to DC 고주파 공진 컨버터의특성 해석에 관한 연구
A Study on the Characteristics Analysis of LLC AC to DC High Frequency Resonant Converter capable of ZVZCS
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초록
본 논문에서 제안한 전류형 LLC AC to DC 고주파 공진 컨버터는 스위치 양단에 병렬로 공진 커패시터(C1, C2)를 연결함으로써 ZVS(Zero Voltage Switching)동작 뿐만 아니라 2차측 Diode의 ZCS(Zero Current Switching) 동작이 가능하므로 스위칭 소자의 턴-온 및 2차측 다이오드의 턴-오프 손실을 저감시킬 수 있다. 본 논문에서 제안한 LLC AC to DC 고주파 공진컨버터의 회로 해석은 무차원화 제어 파라메타를 도입하여 범용성 있게 기술하였다. 또한 제안한 LLC AC to DC 고주파 공진 컨버터의 운전 특성은 무파원화 제어 주파수(μ), 무차원화 저항(λ) 등의 무차원화 제어 파라메타를 이용하여 특성 평가를수행하였다. 특성 평가를 통한 특성값을 기초한 LLC AC to DC 고주파 공진 컨버터 설계 기법의 일예를 제시하였으며, 실험및 PSIM 시뮬레이션을 통해 이론 해석의 정당성을 입증하였다.
Abstract
This paper presents the current-fed type LLC AC to DC high frequency resonant converter capable of ZVZCS(Zero-Voltage and Zero-Current Switching). The current-fed type LLC AC to DC high frequency resonant converter proposedin this paper could operate not only in ZVS(Zero-Voltage Switching) operation by connecting the resonant capacitors(C1,C2) in parallel across the switching devices but also in ZCS(Zero-Current Switching) operation of the secondary diode. The ZVS and ZCS operations can reduce the turn-on loss of the switching devices and the turn-off loss of thesecondary diodes, respectively. The circuit analysis of current-fed type LLC AC to DC high frequency resonant converterproposed in this paper is addressed generally by adopting the normalized parameters. The operating characteristics ofproposed LLC AC to DC high frequency resonant converter were also evaluated by using the normalized controlparameters such as the normalized control frequency(μ), the normalized load resistor(λ) and so on. Based on thecharacteristic values through the characteristics of evaluation, an example of the design method of proposed LLC AC toDC high frequency resonant converter is suggested, and the validity of the theoretical analysis is confirmed using theexperimental results and PSIM simulation.
참고문헌 (9)
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