Modeling and scheme for stabilizing output voltage of a medium power full-bridge isolated DC-DC converter

A novel topology of full-bridge isolated DC-DC converters, which is widely used in renewable energy generation and auxiliary railway supply, is presented in this paper. The proposed full-bridge isolated DC-DC converter is composed of a PWM inverter, a diode rectifier and a high frequency (HF) transformer. In this topology, the stabilization of output voltage is difficult to achieve because of high frequency switching operation. The mathematics model of this topology is discussed deeply firstly. The two control methods for stabilizing the output voltage of the full-bridge isolated DC-DC converter are proposed based on modeling and analysis.