公开(公告)号：US20220158443A1

公开(公告)日：2022-05-19

申请号：US17589316

申请日：2022-01-31

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fangpo Zhang ,  Jun Wang ,  Tiansan Lin ,  Houjian Xu

IPC: H02H7/12 ,  H02M1/32 ,  H02M3/158

Abstract: A fault isolation apparatus includes a controller and a circuit breaker. When the circuit breaker is located on a bus connected to a DC/DC conversion unit, if a voltage collected by a first voltage collection terminal is a negative value, it indicates that input or output of the DC/DC conversion unit is reversely connected. In this case, if the circuit breaker is controlled to be opened, the DC/DC conversion unit can be prevented from being connected in series to other parallel DC/DC conversion units. If a voltage collected by a first voltage collection terminal is low and a current collected by a current collection terminal is large, it indicates that the DC/DC conversion unit is short-circuited. In this case, if the circuit breaker is controlled to be opened, another component connected in series to the DC/DC conversion unit can also be prevented from backfeeding energy to the DC/DC conversion unit.

公开(公告)号：US12095256B2

公开(公告)日：2024-09-17

申请号：US17589316

申请日：2022-01-31

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fangpo Zhang ,  Jun Wang ,  Tiansan Lin ,  Houjian Xu

IPC: H02H7/12 ,  H02M1/32 ,  H02M3/158

CPC classification number: H02H7/1213 ,  H02M1/32 ,  H02M3/158

Abstract: A fault isolation apparatus includes a controller and a circuit breaker. When the circuit breaker is located on a bus connected to a DC/DC conversion unit, if a voltage collected by a first voltage collection terminal is a negative value, it indicates that input or output of the DC/DC conversion unit is reversely connected. In this case, if the circuit breaker is controlled to be opened, the DC/DC conversion unit can be prevented from being connected in series to other parallel DC/DC conversion units. If a voltage collected by a first voltage collection terminal is low and a current collected by a current collection terminal is large, it indicates that the DC/DC conversion unit is short-circuited. In this case, if the circuit breaker is controlled to be opened, another component connected in series to the DC/DC conversion unit can also be prevented from backfeeding energy to the DC/DC conversion unit.

公开(公告)号：US11894762B2

公开(公告)日：2024-02-06

申请号：US17670592

申请日：2022-02-14

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jun Wang ,  Houjian Xu ,  Tiansan Lin ,  Fangpo Zhang

IPC: H02M3/158 ,  H02M1/00 ,  H02M3/07

CPC classification number: H02M1/0095 ,  H02M1/0058 ,  H02M3/07 ,  H02M3/158

Abstract: A direct current-direct current conversion circuit includes: an input inductor, a first capacitor, a second capacitor, a flying capacitor, a first switch, a second switch, a first inductor, a first diode, a first buffer circuit, a third switch, a fourth switch, a second inductor, a second diode, and a second buffer circuit. A power supply, the input inductor, the first diode, the second diode, the first capacitor, and the second capacitor are sequentially connected in series. A first terminal of the flying capacitor is connected between the first diode and the second diode. A second terminal of the flying capacitor is connected between the first switch and the third switch, and the second terminal of the flying capacitor is further connected between the second switch and the second inductor.

公开(公告)号：US20230396057A1

公开(公告)日：2023-12-07

申请号：US18452352

申请日：2023-08-18

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fangpo Zhang ,  Tiansan Lin ,  Xiufeng Zhang ,  Jinxiang Zhan

IPC: H02H7/20 ,  H02J3/38 ,  H02S40/36 ,  H02S50/10

CPC classification number: H02H7/20 ,  H02J3/381 ,  H02S40/36 ,  H02S50/10 ,  H02J2300/24

Abstract: This application discloses a photovoltaic system, a direct-current combiner box, and a fault isolation method. The photovoltaic system includes a fault isolation circuit and a DC/DC conversion circuit. A first end of the fault isolation circuit is connected to N photovoltaic strings, and a second end of the fault isolation circuit is connected to an input end of the DC/DC conversion circuit. The fault isolation circuit includes a multipole switch, and each group of photovoltaic strings in the N photovoltaic strings is connected to an input end of a power conversion circuit through one pole of switch in the multipole switch. Each group of photovoltaic strings includes at least two photovoltaic strings. When a reverse connection fault occurs in the N photovoltaic strings, the entire multipole switch is turned off in linkage.