Investigation and optimal design of output capacitance in chopper by high speed voltage response control

This paper describes an optimal design method for a current regulator and an output voltage regulator with a output capacitor in a boost-up chopper. In order to reduce the output capacitor and the boost-up reactor, high speed response of the current regulator and the output voltage regulator are required. In this paper, the current controller is designed based on dead-beat control with P, PI or IP regulator. Then, it is confirmed that the maximum control response of the dead-beat controller is limited up to 0.32 of the sampling frequency, which is the switching frequency. The minimum output capacitor is calculated by the control response of the output voltage regulator and the allowance of the voltage fluctuation. Moreover, the validities of the design method are confirmed by experimental results that the design values agree well with the analysis results within 8.53% error.