Energy Transmission Modes and Output Ripple Voltage of Forward-Flyback Converter
Liu Shulin1, Cao Jian1, Hu Chuanyi1, Yan Jizhi1, Wang Chuanliang1,2
1. College of Electrical and Control Engineering Xi’an University of Science & Technology Xi’an 710054 China;; 2. Shaanxi ZTE Xianglin Electronic Technology Co. Ltd Xi’an 710065 China;
Abstract The energy transmission modes (ETM) of forward-flyback converter were deeply studied to provide theoretical guidance for its design and development. When the flyback part works in continuous conduction mode (CCM) and discontinuous conduction mode (DCM), there are six kinds and four kinds of energy transfer modes of the ETM respectively. The critical inductances among ETMs were obtained, and the critical inductances of transformer in CCM increase with the decrease of inductance. The expression of the output ripple voltage (ORV) in each ETM was deduced. It is pointed out that the ORV decreases with increasing the inductance of transformer when flyback part works in incomplete inductor supplying mode. However, the ORV is independent of the transformer inductance in complete inductor supplying mode and decreases with decreasing inductance. Meanwhile, only a small inductance and capacitance are needed to meet the requirement of ORV. Simulation and experimental results verify the correctness of the theoretical analysis.
Liu Shulin,Cao Jian,Hu Chuanyi等. Energy Transmission Modes and Output Ripple Voltage of Forward-Flyback Converter[J]. Transactions of China Electrotechnical Society, 2019, 34(8): 1647-1656.
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2019, Vol. 34 
