Patent ID: 9570996
Date: 2017-02-14
CPC Classifications: H02M

Claim:
1. A power conversion apparatus comprising: a transformer having a primary winding, a first secondary winding, and a second secondary winding, wherein an opposite-polarity terminal of the primary winding receives an input voltage; a power switch having a first terminal coupled to a common-polarity terminal of the primary winding, a second terminal coupled to a ground potential, and a control end receiving a pulse width modulation signal; a first power conversion circuit coupled to the first secondary winding, and configured to convert a first induction voltage of the first secondary winding, so as to supply a first output voltage; a second power conversion circuit coupled to the second secondary winding, and configured to convert a second induction voltage of the second secondary winding, so as to supply a second output voltage, wherein the first output voltage is greater than the second output voltage; and an output auxiliary unit coupled between the second secondary winding and the first power conversion circuit, wherein when the first power conversion circuit and the second power conversion circuit respectively supply the first output voltage and the second output voltage, the output auxiliary unit captures a reverse voltage of the second secondary winding to assist an output of the first power conversion circuit.