A Modified Duty Cycle Frequency Control Soft Switching of Full Bridge DC-DC Converter for Electric Vehicle Battery Charging

摘要

The choice of an efficient dc-dc converter plays an important role in the its designing and switching. In this paper, modified duty cycle frequency control (MDFC) is discussed. The converter parameter design is also discussed. In the MDFC method, the APWM is combined with variable operating switching frequency. The optimal control of the switching frequency controls the peak current of the auxiliary inductors with loosing the soft switching during transition period of the switches. Therefore, the efficiency of the converter increases by reducing the switching loss, conduction loss, circulating loss and auxiliary circuit loss with the help of the proposed modified control for 1.2 KW system.