公开(公告)号：US20180159437A1

公开(公告)日：2018-06-07

申请号：US15662301

申请日：2017-07-28

Applicant: Delta Electronics (Shanghai) Co.,Ltd.

Inventor： Haibin SONG ,  Daofei XU ,  Jinfa ZHANG ,  Jian ZHOU ,  Qi FU ,  Leyang YANG

IPC: H02M3/335 ,  H02M1/08

CPC classification number: H02M3/33592 ,  H02M1/083 ,  H02M2001/0009 ,  H02M2001/0058

Abstract: The present invention discloses a control method and a control apparatus for a Flyback circuit. The Flyback circuit includes a primary switch, a secondary rectifier unit, a transformer and an output capacitor. The secondary rectifier unit includes a first terminal and a second terminal, which are electrically connected to the transformer and the output capacitor, respectively. In the control method for a Flyback circuit, after the secondary rectifier unit is controlled to be turned on once or twice according to the input voltage and/or output power of the Flyback, the primary switch is turned on to achieve the zero-voltage-switching. According to the invention, the zero-voltage-switching (ZVS) of the primary switch can be achieved under the entire input voltage range and the entire load range without adding additional power devices.