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| Analysis of the Optimal Operating Mode of Auxiliary Inductance and LC Parameter Optimization Design of Forward-Flyback Converter with Additional LC |
| Liu Shulin, Wang Hangjie, Hu Chuanyi, Zhang Hailiang, Wang Bin |
| School of Electrical and Control Engineering Xi'an University of Science & Technology Xi'an 710054 China |
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Abstract In order to reduce the output voltage ripple of the forward-flyback converter, a forward-flyback converter with additional LC was proposed. According to the voltage and current waveforms of the additional LC, the working principle and energy transmission process of the proposed forward-flyback converter were analyzed, and the optimal operation mode was obtained to ensure that the current of the auxiliary inductor is not reversed while the superimposed current ripple of the forward inductor and the auxiliary inductor is minimized. The output ripple voltage in this mode decreased with the decrease of the auxiliary inductor. Within a given range of input voltage and load variation, the critical conditions for the auxiliary inductor current not to reverse when the forward inductor work in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) were derived respectively. Thus, an optimal design method of auxiliary inductors and capacitors was proposed. Examples and experimental results verify the correctness of the theoretical analysis and the feasibility of the proposed optimization design method.
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Received: 11 July 2020
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2022, Vol. 37 
