Matrixx simulation of switched mode power converter systems

When using computer simulation techniques to assess and design control networks for power electronic systems it is often necessary to simulate the operation of the converter and its control circuit over many switching cycles. Matrix_x is a general purpose system simulation package in which systems are defined in terms of equations and block diagrams. A power converter may be represented in Matrix_x as a switched sequence of linear, time-invariant, state-space equations. Matrix_x simulation has been used to compare two alternative current control strategies for the phase-shift controlled converter. Average current mode control has been shown to offer improved performance both in terms of ensuring symmetrical transformer magnetisation and in producing a first-order dominated control-to-output characteristic. Close agreement with practical measurements has been demonstrated