公开(公告)号：US11789048B2

公开(公告)日：2023-10-17

申请号：US17340559

申请日：2021-06-07

Applicant: STMicroelectronics S.r.l.

Inventor： Vanni Poletto ,  Nicola Errico ,  Paolo Vilmercati ,  Marco Cignoli ,  Vincenzo Salvatore Genna ,  Diego Alagna

IPC: G01R19/165 ,  H01H47/02 ,  H01H47/32

CPC classification number: G01R19/1659 ,  H01H47/02 ,  H01H47/325

Abstract: An embodiment circuit comprises high-side and low-side switches arranged between supply and reference nodes, and having an intermediate node. A switching control signal is applied with opposite polarities to the high-side and low-side switches. An inductive load is coupled between the intermediate node and one of the supply and reference nodes. Current sensing circuitry is configured to sample a first value of the load current flowing in one of the high-side and low-side switches before a commutation of the switching control signal, sample a second value of the load current flowing in the other of the high-side and low-side switches after the commutation of the switching control signal, sample a third value of the load current flowing in the other of the high-side and low-side switches after the second sampling, and generate a failure signal as a function of the first, second and third sampled values of the load current.

公开(公告)号：US20210389351A1

公开(公告)日：2021-12-16

申请号：US17340559

申请日：2021-06-07

Applicant: STMicroelectronics S.r.l.

Inventor： Vanni Poletto ,  Nicola Errico ,  Paolo Vilmercati ,  Marco Cignoli ,  Vincenzo Salvatore Genna ,  Diego Alagna

IPC: G01R19/165 ,  H01H47/32 ,  H01H47/02

Abstract: An embodiment circuit comprises high-side and low-side switches arranged between supply and reference nodes, and having an intermediate node. A switching control signal is applied with opposite polarities to the high-side and low-side switches. An inductive load is coupled between the intermediate node and one of the supply and reference nodes. Current sensing circuitry is configured to sample a first value of the load current flowing in one of the high-side and low-side switches before a commutation of the switching control signal, sample a second value of the load current flowing in the other of the high-side and low-side switches after the commutation of the switching control signal, sample a third value of the load current flowing in the other of the high-side and low-side switches after the second sampling, and generate a failure signal as a function of the first, second and third sampled values of the load current.