ISOLATED HALF-BRIDGE DC-DC CONVERTER USING SOFT SWITCHING PWM

Half Bridge DC-DC Converter is the better choice for medium and high power supply design. The great Challenge in the field of Power systems is the demand in power supply for smaller size with high power density and efficiency. The half bridge ZVS PWM converter has been used in telecommunication, high power server and networking power supplies because of its excellent performance. Isolated Half-Bridge DC-DC Converter Using Soft Switching PWM consisting of a basic half-bridge dc-dc converter and an auxiliary circuit consisting of two active switches and one capacitor is proposed in this paper. The main power switches operate with ZVZCS while the power switches of auxiliary switches operate under ZCS conditions. The output voltage of this converter is varied by PWM control. The main features of this converter are simple circuit, less number of components and softswitching operation over the wide control range with improved efficiency. The proposed Converter is simulated using MATLAB/SIMULINK and the results are presented and discussed in this paper.