公开(公告)号：US20230076274A1

公开(公告)日：2023-03-09

申请号：US17939260

申请日：2022-09-07

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Zhen Cao ,  Jie Kong ,  Zhong Wang ,  Tao Zhang ,  Tao Shi

IPC: H02M1/32 ,  H02H1/00 ,  H02H7/122 ,  H02H7/12

Abstract: A short-circuit protection apparatus includes a first detection branch, a second detection branch, and a controller. The first detection branch includes a first sampling resistor and a first sampling capacitor that is connected in parallel to the first sampling resistor. A difference between an absolute value of a second sampling voltage and an absolute value of a first sampling voltage is a first difference. The controller obtains a comparison result between an absolute value of a first sampling voltage at two terminals of the first sampling resistor and an absolute value of a second sampling voltage at two terminals of the second sampling resistor, and if a difference between the absolute value of the second sampling voltage and the absolute value of the first sampling voltage is a second difference and the second difference is less than the first difference, controls the target circuit to stop working.

公开(公告)号：US12160167B2

公开(公告)日：2024-12-03

申请号：US17939260

申请日：2022-09-07

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Zhen Cao ,  Jie Kong ,  Zhong Wang ,  Tao Zhang ,  Tao Shi

IPC: H02M1/32 ,  H02H1/00 ,  H02H7/12 ,  H02H7/122

Abstract: A short-circuit protection apparatus includes a first detection branch, a second detection branch, and a controller. The first detection branch includes a first sampling resistor and a first sampling capacitor that is connected in parallel to the first sampling resistor. A difference between an absolute value of a second sampling voltage and an absolute value of a first sampling voltage is a first difference. The controller obtains a comparison result between an absolute value of a first sampling voltage at two terminals of the first sampling resistor and an absolute value of a second sampling voltage at two terminals of the second sampling resistor, and if a difference between the absolute value of the second sampling voltage and the absolute value of the first sampling voltage is a second difference and the second difference is less than the first difference, controls the target circuit to stop working.

公开(公告)号：US11852671B2

公开(公告)日：2023-12-26

申请号：US17707436

申请日：2022-03-29

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Zhong Wang ,  Shengjie Zhang ,  Jianshan Li ,  Yu Peng ,  Shijiang Yu ,  He Zhou ,  Bo Yu

IPC: G01R31/52 ,  G01R31/14 ,  H02J3/38

CPC classification number: G01R31/14 ,  G01R31/52 ,  H02J3/381 ,  H02J2300/24

Abstract: A photovoltaic energy system and a method for detecting a ground insulation impedance, improve accuracy of detecting a ground insulation impedance after one or more conversion circuits are connected in parallel. The photovoltaic energy system includes one or more conversion circuits and a detection circuit. The detection circuit includes an alternating current signal source and a sampling resistor that are connected in series, a first sampling circuit, and a control circuit. The control circuit is configured to control the alternating current signal source to output harmonic signals of a first frequency and a second frequency. The first sampling circuit is configured to: when the alternating current signal source outputs the harmonic signal of the first frequency, collect a voltage at both terminals of the sampling resistor to obtain a first voltage.