Asymmetric dual half-bridge PWM-FM converter with quad regulated outputs

Asymmetric dual half-bridge PWM-FM converter with four outputs is discussed. Four independent regulated outputs are obtained with two legs and four switches. Among the four outputs, two are regulated through the switching frequencies of two asymmetrical half-bridge converters and the other two are regulated through duty cycles. The outputs are regulated over a wide range of input voltages and load variations. ZVS is also realized in the proposed topology. Hence it can operate with higher efficiency at higher switching frequencies. Simulation results are obtained for a converter with 48V input and 15V/16A, 12V/20A, 5V/10A & 3.3V/10A outputs.