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.

公开(公告)号：US20220278616A1

公开(公告)日：2022-09-01

申请号：US17681452

申请日：2022-02-25

Applicant: Huawei Technologies Co., Ltd.

Inventor： Guolei YU ,  Guiping ZHANG ,  Xuyang WU

IPC: H02M3/158 ,  H02M1/36 ,  H02M1/32

Abstract: A DC/DC converter includes a soft start overshoot prevention mechanism. The DC/DC converter includes a DC/DC conversion circuit, an overshoot detection apparatus, a pulse width modulation generator, an error amplifier, and an integration circuit connected to an output port of the error amplifier. The integration circuit is configured to perform integration processing on a difference between a reference voltage and an output voltage of the DC/DC conversion circuit, and control an amplitude of an amplified voltage that is input by the error amplifier to the pulse width modulation generator. The overshoot detection apparatus obtains an operating status parameter of the DC/DC converter, and controls, when the operating status parameter of the DC/DC converter meets an operating status parameter requirement, the integration circuit to discharge.