公开(公告)号：US20210408801A1

公开(公告)日：2021-12-30

申请号：US17471794

申请日：2021-09-10

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Jincheng SHAO ,  Jixin ZHU ,  Xiaowei XIE ,  Chen WANG

IPC: H02J3/38 ,  H02J7/35 ,  H02J7/34

Abstract: A power supply circuit includes a first input end (IN1), a second input end (IN2), a first output end (OUT1), and a second output end (OUT2). An input end of a first voltage conversion circuit (VCC) is used as IN1 and connected to an output end of a solar panel. A first output end of the first VCC is used as OUT1 and connected to a first power supply end of a monitoring chip. A second output end of the first VCC is connected to an input end of an energy storage module. An input end of the rectifier circuit is used as IN2 and connected to an AC power network. An output end of the rectifier circuit is connected to an input end of a second VCC. An output end of the second VCC and an output end of the energy storage module are used as OUT2 and connected to a second power supply end of the monitoring chip.

公开(公告)号：US20220011356A1

公开(公告)日：2022-01-13

申请号：US17486506

申请日：2021-09-27

Applicant: Huawei Technologies Co., Ltd.

Inventor： Chen WANG ,  Xiaowei XIE ,  Yang HU

IPC: G01R27/02 ,  G01R27/08 ,  G01R27/18 ,  G01R31/42 ,  G01R31/52 ,  H02S40/32 ,  H02M7/44 ,  H02J3/38

Abstract: An insulation resistance detection circuit and method are disclosed. The circuit includes a controller configured to: open a first relay, and close second relays, or switch an on/off status of at least one of the second relays; determine, based on a first measurement value between a positive input terminal of an inverter circuit and an earthing point, whether the positive input terminal of the inverter circuit is short-circuited or has low resistance to protective earthing; and determine, based on a second measurement value between a negative input terminal of the inverter circuit and the earthing point, whether the negative input terminal of the inverter circuit is short-circuited or has low resistance to protective earthing, where the first relay is one of in M relays and is connected to at least one impedor in parallel, and the second relays are relays other than the first relay in the M relays.