Design of an Efficient Dc-Dc Full Bridge Converter using Current Doubler

This paper is aimed at designing and modeling an efficient DC-DC Full Bridge Converter which will give high efficiency and reduced power losses. The designed converter is of 3 kW buck converter. This converter is proposed for the application in hybrid electric vehicle and railways where low output voltage is required. The existing model is investigated and it is found that it has less efficiency, more power loss and larger size. Hence a new model is proposed which will overcome the problems existed in the previous model. For this purpose current doubler circuit has been used in the secondary side of the transformer. In current doubler is a simple rectifier in which secondary side of the transformer see only half of the current flowing to the load which in turn causes the less current in secondary winding of the transformer and hence less loss, therefore increased efficiency. It reduces the ripple at the output which is again advantage in improving the efficiency of the converter. All the calculations will be carried out and simulations are performed in MATLAB. The switching technique used in this proposed model is Zero Voltage Switching (ZVS).