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

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... ntaining 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.