Patent ID: 9742298
Date: 2017-08-22
CPC Classifications: H02M

Claim:
1. A transformer, comprising: a first winding disposed at a primary side, having a first number of turns, comprising a first terminal coupled to an input voltage terminal, and a second terminal coupled to a first ground; a second winding disposed at a secondary side, having a second number of turns, comprising a first terminal, and a second terminal coupled to a second ground; a first current direction control unit comprising a first terminal coupled to the first terminal of the second winding, and a second terminal coupled to an output voltage terminal; a third winding disposed at the secondary side, having a third number of turns, comprising a first terminal and a second terminal; a second current direction control unit comprising a first terminal coupled to the first terminal of the third winding, and a second terminal coupled to the output voltage terminal; a first switch comprising a first terminal coupled to the second terminal of the third winding, a second terminal coupled to the first terminal of the second winding, and a control terminal configured to receive a first switch control signal; a loading capacitor comprising a first terminal coupled to the output voltage terminal, and a second terminal coupled to the second ground; a fourth winding disposed at the secondary side, having a fourth number of turns and comprising a first terminal, and a second terminal; a third current direction control unit comprising a first terminal coupled to the first terminal of the fourth winding, and a second terminal coupled to the output voltage terminal; and a third switch comprising a first terminal coupled to the second terminal of the fourth winding, a second terminal coupled to the first terminal of the first current direction control unit, and a control terminal configured to receive a third switch control signal.