Patent ID: 7876067
Filing Date: 2011-01-25
Classification: H02J

Abstract:
1. A connector-less charging circuit, comprising: a transformer having a primary side for coupling a charging voltage to a secondary side of the transformer, the primary side removably associated with the secondary side, wherein the secondary side of the transformer comprises an asymmetrically wrapped center tapped transformer; an output capacitor, wherein the output capacitor is peaked charged only by a first portion of the asymmetrically wrapped center tapped transformer during the first portion of the duty cycle and only by a second portion of the asymmetrically wrapped center tapped transformer during the second portion of the duty cycle; a primary switch responsive to a control signal for connecting the transformer to ground during a first portion of a duty cycle and disconnecting the transformer from ground during a second portion of the duty cycle; an active clamp circuit connected to the primary side of the transformer for recycling leakage energy from the transformer back to a source voltage responsive to the control signal during the second portion of the duty cycle; and a PWM controller for generating the control signal.