公开(公告)号：US20230029565A1

公开(公告)日：2023-02-02

申请号：US17876419

申请日：2022-07-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Guolei YU ,  Shuchao SONG ,  Junliang QIN ,  Zhiqiang XIANG

IPC: H02M1/00 ,  H02M1/14 ,  H02M3/158 ,  H02M1/08

Abstract: The three-level direct current converter includes: a flying capacitor, a plurality of switch groups, a drive circuit, and a control circuit. The control circuit includes at least an on-time generator. When a voltage on the flying capacitor deviates from a half of a power supply voltage, the on-time generator changes a charging current of a capacitor of the on-time generator to adjust an output on-time signal, and outputs the on-time signal to the drive circuit. The drive circuit generates a drive pulse signal based on the on-time signal to drive switch statuses of the plurality of switch groups, to adjust charging time and discharging time of the flying capacitor, where an absolute value of a difference between the voltage on the flying capacitor and the half of the power supply voltage is less than or equal to a preset threshold.