公开(公告)号：US11239746B2

公开(公告)日：2022-02-01

申请号：US16783310

申请日：2020-02-06

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Tao Zhao ,  Fushuai Zhuang ,  Xinyu Wang ,  Jiacai Zhuang ,  Mingda Wang ,  Yuan Zhuang

IPC: H02M1/36 ,  H02M1/08 ,  H02M3/335 ,  H02M7/5387 ,  H02J3/38 ,  H02M1/00

Abstract: A two-stage converter, a method for starting the two-stage converter, an LLC converter, and an application system are provided. A controller of the LLC converter of the two-stage converter first controls a main circuit of the LLC converter to perform hiccup charging on a direct current bus of a later-stage converter at a preset interval, so that the direct current bus voltage of the later-stage converter gradually increases, until an auxiliary power supply of the later-stage converter starts to operate, to supply power to the controller of the later-stage converter. After the controller of the later-stage converter reports the detected direct current bus voltage, the controller of the LLC converter determines whether the output voltage of the LLC converter increases to a hiccup starting voltage. If so, the controller of the LLC converter controls the main circuit to operate in a hiccup voltage stabilization phase.