公开(公告)号：US12055601B2

公开(公告)日：2024-08-06

申请号：US17960283

申请日：2022-10-05

Applicant: Hong Kong Applied Science And Technology Research Institute Co., Ltd.

Inventor： Xin Li ,  Kwong Yin Tsang ,  Qingchun Li ,  Tin Ho Li

IPC: G01R31/52 ,  H02H3/08 ,  H02H3/44

CPC classification number: G01R31/52 ,  H02H3/08 ,  H02H3/44

Abstract: Described is a method of identifying a short-circuit (SC) like event in a circuit breaker (CB). The method comprises sampling an incoming current to the CB to determine a maximum value of a slope of a curve of the incoming current. The method includes sampling the incoming current again before a level of the incoming current reaches a predetermined, preset, selected, or calculated SC threshold value THSC for the CB. The method involves determining from the sampled incoming current that a value of the slope of the incoming current has changed from its maximum slope value to a lower slope value to thereby determine that the incoming current is indicative of a SC like event and does not comprise a real SC event.

公开(公告)号：US20240118350A1

公开(公告)日：2024-04-11

申请号：US17960283

申请日：2022-10-05

Applicant: Hong Kong Applied Science And Technology Research Institute Co., Ltd.

Inventor： Xin Li ,  Kwong Yin Tsang ,  Qingchun Li ,  Tin Ho Li

IPC: G01R31/52 ,  H02H3/08 ,  H02H3/44

CPC classification number: G01R31/52 ,  H02H3/08 ,  H02H3/44

Abstract: Described is a method of identifying a short-circuit (SC) like event in a circuit breaker (CB). The method comprises sampling an incoming current to the CB to determine a maximum value of a slope of a curve of the incoming current. The method includes sampling the incoming current again before a level of the incoming current reaches a predetermined, preset, selected, or calculated SC threshold value THSC for the CB. The method involves determining from the sampled incoming current that a value of the slope of the incoming current has changed from its maximum slope value to a lower slope value to thereby determine that the incoming current is indicative of a SC like event and does not comprise a real SC event.

公开(公告)号：US11043891B1

公开(公告)日：2021-06-22

申请号：US16750247

申请日：2020-01-23

Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd

Inventor： Sui Pung Cheung ,  Qing Chun Li ,  Xin Li ,  Tin Ho Li

IPC: H02M7/12 ,  H02M7/48 ,  H02M1/084 ,  H02P27/08

Abstract: Described is a controller for an AC to DC or a DC to AC multi-phase power converter of a type having N power converter phases, where N is greater or equal to 2. The controller comprises a control module configured to change or vary a phase shift angle of the input current or output current for each of the N power converter phases such that an average phase shift value for each of said N power converter phases over a control module AC line cycle is about, near or substantially the same value. In an embodiment of an AC/DC or a DC/AC multi-phase power converter of a type having N power converter phases arranged in parallel, an advantage of arranging the average phase shift value for each power converter phase to be substantially equal or about equal over an AC line cycle is that it reduces or eliminates any imbalances in the input currents or output currents of the N power converter phases. In preferred arrangements, the control module varies the phase shift angle of the input current or the output current for each of the N power converter phases over each AC line cycle using respective PWM switch control signals.