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| Analysis of Energy Transmission Process and Design of Auxiliary Capacitor for Secondary Side Parallel LCD Forward Converter |
| Liu Shulin, Liu Xu, Peng Yinqiao, Yan Jizhi, Zhang Hailiang |
| College of Electrical and Control Engineering Xi’an University of Science & Technology Xi’an 710054 China |
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Abstract Aiming at the problems of low excitation energy utilization rate, complicated circuit composition or large control difficulty of the existing forward converter magnetic reset circuit, a forward converter topology with a secondary side parallel LCD is proposed. The working principle and energy transmission mechanism of the proposed forward converter are analyzed in depth, and it is pointed out that the forward converter with LCD can transmit forward energy and excitation energy at the same time, and the excitation inductance during the flyback can work in continuous conduction mode (CCM), It can also work in discontinuous conduction mode (DCM), that is, the proposed forward converter no longer needs the traditional magnetic reset, and the voltage stress of the switching tube when the magnetizing inductor works in CCM is lower; by analyzing the effect of the auxiliary capacitor on the working mode of the magnetizing inductor, An auxiliary capacitance design method to ensure that the magnetizing inductance of the forward converter is working in CCM is proposed. The examples and experimental results verify the feasibility of the proposed forward converter and the correctness of the theoretical analysis and design method.
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Received: 11 July 2020
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2022, Vol. 37 
