Efficient computer-aided simulation approach of switched-mode power conversion circuits and systems with digital control implementation and its practical applications

An efficient computer-aided simulation approach is presented in order to analyze digitally-controlled switching mode power converter circuits and systems. The computer-aided simulation procedure treated here is based on a circuit and system equation modeled by time-varying resistors which can be formulated by taking the place of the active switches and the passive diodes incorporated into the converter circuits in addition to a state equation for the inductors and the capacitors along with an algebraic computation method to transform the matrices of the circuit equation into the matrices of the state equation. In this approach, the numerical integration is achieved with rather less numerical calculation steps because of the minimum matrix size of the state equation. The effectiveness of this approach are proved through introducing a three-phase voltage-fed high-power-factor AC to DC converter with a digital control scheme.