A No DC-Gain Error Small-Signal Model for the Zero-Voltage-Switching Phase-Shift-Modulated Full-Bridge DC-DC Converter

In this paper, an improved small-signal model for the zero-voltage-switching phase-shift-modulated full-bridge which eliminates the DC-gain errors of its line-to-output and control-to-output model transfer functions is presented. A DC-gain and a frequency response comparison among small-signal models are evaluated. The model presented here demonstrates to be accurate for different designs parameters, being it in a simple s-domain polynomial ratio form. Experimental frequency response demonstrates similar results with transfer functions responses of the improved model here presented