Patent ID: 7489527

Claim:
A DC/DC converter comprising: an input filter; a half-bridge converter without PWM (Pulse Width Modulation) control function; a DC transformer with an integrated output inductor, comprising: a magnetic core having air gaps and comprising a first leg, a second leg having a first air gap, and a third leg having a second air gap; a primary winding wound around the first leg; a first secondary winding wound around the first leg and the second leg for generating a first inductance by the first air gap; and a second secondary winding wound around the first leg and the third leg for generating a second inductance by the second air gap; a synchronous rectifier; and an output capacitor connected to the first secondary winding, a center tap of the second secondary winding, and the synchronous rectifier; wherein the number of windings of the first secondary winding wound around the first leg is more than the number of winding of the first secondary winding wound around the second leg, and the number of windings of the second secondary winding wound around the first leg is more than the number of winding of the second secondary winding wound around the third leg.