公开(公告)号：EP4293864A1

公开(公告)日：2023-12-20

申请号：EP23175108.2

申请日：2023-05-24

Applicant: STMicroelectronics S.r.l.

Inventor： MARZO, Alberto ,  RANDAZZO, Vincenzo ,  POLETTO, Vanni ,  SUSINNA, Giovanni

IPC: H02J7/00

Abstract: A capacitance (Cload) coupled to a source of electrical charge (S) via a drain-source current flow path through a field-effect transistor (M1), is precharged by making the field-effect transistor (M1) selectively conductive in response to the gate-source voltage (Vgs) of the field-effect transistor (M1) exceeding an (e.g., temperature-dependent) threshold (Vth). The difference between the gate-source voltage (Vgs) of the field-effect transistor (M1) and the threshold (Vth) provides an overdrive value of the field-effect transistor (M1). The gate of the field-effect transistor (M1) is driven with a variable gate-source voltage (Vgs) having as a target maintaining a constant overdrive value. Electrical charge is thus controllably transferred from the source (S) to the capacitance (Cload) via the drain-source current flow path through the field-effect transistor (M1) avoiding undesirably high inrush currents and hot spotting.

公开(公告)号：EP4297213A1

公开(公告)日：2023-12-27

申请号：EP23176695.7

申请日：2023-06-01

Applicant: STMicroelectronics (China) Investment Co., Ltd. ,  STMicroelectronics S.r.l.

Inventor： CHEN, Ping ,  YAN, Hui ,  RANDAZZO, Vincenzo ,  MARZO, Alberto ,  RE, Andrea Camillo

IPC: H02H3/087 ,  H02H7/00 ,  H02H11/00 ,  H03K17/08 ,  H02H7/18

Abstract: A circuit for reverse battery protection (216) includes an isolation circuit (218) and a control circuit (220). The isolation circuit (218) is coupled between a gate output of an electronic fuse, E-fuse (202) and at least one external metal-oxide-semiconductor field-effect transistor,MOSFET (210). The E-fuse (202) is coupled between a battery voltage pin and an external ground pin and further coupled to a microcontroller (206). The isolation circuit (218) is configured to disconnect the gate output from the at least one external MOSFET (210) when the battery is installed with reverse polarity. The control circuit (220) is coupled between the external ground pin and the at least one external MOSFET (210). The control circuit (220) is configured to turn on the at least one external MOSFET (210) when the battery is installed with the reverse polarity.