Patent ID: 8031499

Claim:
A DC/DC converter comprising: a transformer ( 10 ) having a primary winding Np and at least first and second secondary windings Ns 1 and Ns 2 ; a main output path connecting the first secondary winding to a main output Vp and comprising a synchronous rectifier circuit, a first inductor L 1 , and a first capacitor C 1 ; an input path connecting a DC supply voltage Ve to the primary winding and including a switch circuit ( 12 ) controlled by a first pulse width modulator PWM 1 to regulate the main output voltage by switching the current in the primary winding; an auxiliary output path connecting the second secondary winding to an auxiliary output Va and comprising an auxiliary rectifier circuit having a control switch M 5 , a free-wheel switch M 6 , a rectifier switch M 3 , a second inductor L 2 , and a second capacitor C 2 ; a second pulse width modulator PWM 2 connected to the control switch M 5 and to the free-wheel switch M 6 to control a conduction interval of said switches in order to regulate the auxiliary output independently of the main output, the rectifier switch M 3 being controlled synchronously with the synchronous rectifier circuit of the main path.