A Novel Digital PCM-V2 Control Method for Active Clamp Flyback Converter to Realize Fast Output Dynamic Response

Active Clamp flyback converter (ACF) is a good candidate to replace the traditional flyback converter to be used in high frequency small power applications. Due to the circuit delay and intrinsic characteristic, PCM controlled ACF converter has a slow output dynamic response. Therefore, by associating the PCM with V2 control method, a novel PCM-V2 control scheme is proposed to improve the output dynamic response of PCM controlled ACF converter. The control scheme is illustrated, and the modeling strategy of the proposed PCM-V2 control is given. After comparing the frequency response curve, the presented PCM-V2 control method has a larger bandwidth than PCM control. To verify the effect of the proposed method, a 65W 20V output ACF converter is simulated ant tested. The simulation and experimental results between PCM-V2 and PCM control are compared and presented. The results show that the output dynamic response of the proposed PCM-V2 is faster than PCM control method in ACF converter.

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