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부스트 PFC 컨버터에서의 ZVT 소프트 스위칭을 위한 최적 스위칭 듀티 추정
방태호(Tae-Ho Bang),장유남(Yu-Nam Jang),김혜천(Hye-Cheon Kim),방정욱(Jung-Wook Park) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
To achieve soft switching in wide range operation point, ZVT (Zero Voltage Transition) soft switching technique can be used in boost PFC (Power Factor Correction) converter. But because it uses additional switch to make the soft switching condition, the efficiency of converter changes according to the operation of a operation time of additional switch. This paper presents the optimization of duty in MOSFET to maximize the efficiency when using zero voltage transition soft switching technique in conventional boost PFC converter. It describes the optimum point with the relationship of switching loss of main converter and conduction loss of auxiliary circuit. To get the fitted graphs of switching loss of boost switch and conduction loss of resonant switch, it uses curve fitting tool of MATLAB. Boost PFC converter is evaluated based on PSIM and converter operation sequence, switching loss and converter efficiency is also presented.
Buck-cascaded Buck-Boost PFC 컨버터의 인덕터 크기 선정
장유남(Yu-Nam Jang),방태호(Tae-Ho Bang),김혜천(Hye-Cheon Kim),박정욱(Jung-Wook Park) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
For converter design, element selection is most important process such as inductor and capacitor. In Power Factor Correction(PFC) converters, variation of input current causes discrete conduction mode operating interval of inductor current. In this paper, 0.5kW ? 2kW PFC converter is simulated by PSIM. Input voltage is from 92Vrms to 322Vrms and switching frequency is 50kHz.
김혜천(Hye-Cheon Kim),방태호(Tae-Ho Bang),장유남(Yu-Nam Jang),박정욱(Jung-Wook Park) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
To handle voltage fluctuation, not only boost operation but also buck operation are essential for PFC converter. The efficiency of various Buck-Boost type PFC converters is analysed by PSIM thermal module which can calculate switching components’ switching loss and conduction loss easily. 2kW PFC converters are simulated. The input voltage is from 92Vrms to 322Vrms. The output voltage is 350V. The operation frequency is 50kHz.