Patent ID: 8139379

Claim:
A reverse energy recovery circuit located in a power conversion circuit equipped with a transformer which includes a primary winding side connected to a power switch driven by a control unit to determine the cycle of input power passing through the primary winding side, the primary winding side including a first end and a second end bridged by a reverse energy recovery circuit, the reverse energy recovery circuit comprising: a first capacitor and a second capacitor coupled with each other in series, the second capacitor including one end connected to the first end of the primary winding side; an ancillary winding which includes a first end connected to the first end of the primary winding side; and a diode which includes an anode bridged the first capacitor and the second capacitor and a cathode connected to a second end of the ancillary winding to determine reverse energy charging the first capacitor and the second capacitor through the first end of the primary winding side and the first capacitor discharging through the diode; wherein the power conversion circuit comprises a set of input terminals, which comprise a first terminal and a second terminal; the first terminal is electrically connected to the first end of the primary winding side, and the second terminal is electrically connected to another end of the second capacitor and is electrically connected to the cathode of the diode; and the second terminal is not a ground terminal of the power conversion circuit.