Abstract: This paper presents a closed loop control of isolated boost full bridge DC-DC converter for used in Medium and High power application. Zero voltage switching is applied in all switches. The DC input voltage is stepped up by using a boost converter. It is inverted using a full bridge inverter. The transformer is used to produce a higher voltage in secondary voltage side. The a.c. Voltage is converted into D.C. Voltage with the help of rectifier. The open loop model, there is no possibility of maintaining a constant voltage with a variation of input voltage. In closed loop system is maintaining a constant voltage is applied with various value of input voltage. The Matlab version is used for simulating the open loop and closed loop full bridge DC DC converter are verified.

Keywords: Bidirectional power flow, zero voltage switching, full bridge, isolated boost converter.