A systematic procedure for determining the stability and oscillations of pulse-width modulated (PWM) feedback control systems under Gaussian disturbances is presented. The method is based upon statistical linearisation and the equivalent gain concept developed by Sridhar and Oldenburger. Equivalent gain formulas for general pulse-width modulated systems were developed and evaluated. Using these formulas a typical PWM system was studied. It was found that the predicted results agreed closely with the results obtained from computer simulation.
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