公开(公告)号：US20240213767A1

公开(公告)日：2024-06-27

申请号：US18598117

申请日：2024-03-07

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Li LU ,  Kai XIN ,  Xinyu YU ,  Yunfeng LIU

IPC: H02H7/20 ,  G01R19/165 ,  H02J3/00 ,  H02J3/38 ,  H02S50/10

CPC classification number: H02H7/20 ,  G01R19/1658 ,  H02J3/001 ,  H02J3/38 ,  H02S50/10 ,  H02J2300/24

Abstract: A photovoltaic system, a relay detection method, and a power supply system. When a fault, for example, sticking of the relay is detected, the controller stops sending a PWM driver gating signal to the inverter, and stops driving of a switch transistor in the inverter, and the inverter stops outputting power, and then determines whether a voltage difference between two ends of the relay is greater than a preset value, to determine whether the relay is faulty. The controller stops sending the PWM driver gating signal to the inverter only within a preset phase range of a voltage of the filter capacitor, to ensure that the voltage of the filter capacitor has a large value. Because the voltage of the filter capacitor is large, an alternating current grid-to-ground voltage is pulled up, to avoid detecting the fault as an alternating current grid-to-ground short circuit.

公开(公告)号：US20240128739A1

公开(公告)日：2024-04-18

申请号：US18398769

申请日：2023-12-28

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Li LU ,  Kai XIN ,  Xinyu YU ,  Boping YANG

IPC: H02H7/20 ,  H02M7/42 ,  H02S40/30

CPC classification number: H02H7/20 ,  H02M7/42 ,  H02S40/30

Abstract: The photovoltaic system includes an inverter, a fan, and a controller. A photovoltaic string and a direct current bus capacitor are connected between a positive input end and negative input end of the inverter. The controller receives a fast shutdown instruction and sends a drive signal to a switching transistor in the inverter, so that the switching transistor performs a switching action under the action of the drive signal, and the switching transistor consumes electric energy during the switching action; or the controller turns on the fan after receiving the fast shutdown instruction to consume electric energy by using the fan; or the controller may send the drive signal to the switching transistor and also control the fan to be turned on, so that both the switching transistor and the fan consume electric energy.