Patent ID: 7948775

Claim:
A half-bridge resonant converter, adapted to deliver power from a DC power source to a load, comprising: a resonant circuit including a resonant inductance and a capacitance; a half-bridge switching circuit coupled to the resonant circuit, including two switches controlled by two corresponding control signals, for alternatively coupling two terminals of the DC power source to an input of the resonant circuit; a rectifier circuit coupled to the resonant circuit for generating an output voltage across the load from an output of the resonant circuit; and a control circuit coupled to the two switches and the output voltage across the load for generating the two control signals, wherein the control signals have the same frequency which is constant and the same duty cycle which is variable according to the load, and one of the control signals is delayed a period by the other one, the period preventing simultaneous conduction of the switches, wherein the duty cycle is less than or equal to 50%.