Patent ID: 7420823
Filing Date: 2008-09-02
Classification: H02M,Y02B

Abstract:
1. A power factor correction circuit, comprising: a first primary winding and a second primary winding of an isolation transformer to receive an AC voltage and an AC current, a first switch coupled to the first winding and a second switch coupled to the second winding to draw current through the first primary winding and the second primary winding when the first switch and the second switch are turned on; a control circuit to drive the first switch and the second switch to generate a current waveform for the AC current in accordance with power factor correction requirements; a first secondary winding and a second secondary winding of the isolation transformer to receive, from the first primary winding and the secondary primary winding, an induced AC voltage and an induced AC current when the first switch and the second switch are turned off; and a rectification circuit on a secondary side of the isolation transformer to rectify the induced AC voltage and the induced AC current.