Reduction of voltage stress in the full bridge BIBRED by duty ratio and phase shift control

A new control scheme is presented which provides simultaneous control of the output voltage and the energy storage capacitor voltage in the full-bridge boost integrated with buck rectifier/energy storage/DC-DC power converter (full-bridge BIBRED). The new control scheme solves the problem of wide voltage excursions for the energy storage capacitor voltage under variable load conditions. A low frequency, large signal AC equivalent circuit is presented. The steady state governing equations are given. Mode boundaries for correct operation as a high quality rectifier are established. The control circuit used to implement the new control scheme is discussed. Experimental results validate the concept of the new control scheme