Abstract

A single-voltage loop and dual-current-voltage loop-control system are proposed to improve the output regulation and the dynamic response of a 2 kW two-switch high-frequency forward converter with an extended duty cycle capability. A design method in the frequency domain is described. It is shown that both control systems can be designed by using an equivalent single-input/output control transfer function. Moreover, an all-pass constant-time-delay filter is included in the transfer function of the converter to improve the linear model at high-frequency. Simulated and experimental results to verify the design and the effects on the dynamic performance of the converter using both controllers are presented.