Modeling Frequency Response of a Novel Pulse Width Modulated Flyback Control Scheme

Abstract:
This paper describes the controller design, small-signal modeling, and validation of a flyback power supply system based on an enhanced Pulse Width Modulated (PWM) control technique capable of excellent output voltage regulation and very high efficiency across a wide range of line and load conditions. A math-based model was formulated to predict the frequency response of the flyback, compensation network, and controller–deriving the closed-loop frequency response of the power supply system across all modes of operation. The model correlates closely to measured system frequency response, precisely predicting the parameters of a stable, well-regulated, and efficient power supply.