Research on feedforward control of Superbuck converter to null audio-susceptibility

The audio-susceptibility A(s) is an important parameter related to the immunity of input disturbance. Some research has shown that proper feedforward controller can reduce the audio-susceptibility to zero. But when the order of converter model is high, the derived feedforward controller is complex and it is hard to realize. In this paper, required feedforward controller of Superbuck converter is analyzed when audio-susceptibility need be reduced to zero. It is presented that a proportional feedforward controller can be used instead of the required complex feedforward controller under certain frequency, which is related to the converter parameters. The conclusions have been verified by the simulations and experiments.