公开(公告)号：US20220255428A1

公开(公告)日：2022-08-11

申请号：US17588065

申请日：2022-01-28

Applicant: STMicroelectronics S.r.l.

Inventor： Salvatore TUMMINARO ,  Alfio PASQUA ,  Marco SAMMARTANO

IPC: H02M3/158 ,  G05F1/44

Abstract: A circuit includes an electronic switch configured to be coupled intermediate a high-voltage node and low-voltage circuitry and configured to couple the low-voltage circuitry to the high-voltage node. A voltage-sensing node is configured to be coupled to the high-voltage node via a pull-up resistor. A further electronic switch can be switched to a conductive state to couple the voltage-sensing node and the control node of the electronic switch. A comparator compares a threshold with a voltage at the voltage-sensing node and causes the further electronic switch to switch on in response to the voltage at said voltage-sensing node reaching said threshold. A charge pump coupled to the current flow-path of the electronic switch is activated to the conductive state to pump electric charge from the current flow-path of the electronic switch to the control node of the electronic switch via the further electronic switch switched to the conductive state.

公开(公告)号：US20230412080A1

公开(公告)日：2023-12-21

申请号：US18458940

申请日：2023-08-30

Applicant: STMICROELECTRONICS S.r.l.

Inventor： Salvatore TUMMINARO ,  Alfio PASQUA ,  Marco SAMMARTANO

IPC: H02M3/158 ,  G05F1/44

CPC classification number: H02M3/158 ,  G05F1/44

Abstract: A circuit includes an electronic switch configured to be coupled intermediate a high-voltage node and low-voltage circuitry and configured to couple the low-voltage circuitry to the high-voltage node. A voltage-sensing node is configured to be coupled to the high-voltage node via a pull-up resistor. A further electronic switch can be switched to a conductive state to couple the voltage-sensing node and the control node of the electronic switch. A comparator compares a threshold with a voltage at the voltage-sensing node and causes the further electronic switch to switch on in response to the voltage at said voltage-sensing node reaching said threshold. A charge pump coupled to the current flow-path of the electronic switch is activated to the conductive state to pump electric charge from the current flow-path of the electronic switch to the control node of the electronic switch via the further electronic switch switched to the conductive state.