US 12,266,922 B2
Reverse battery protection circuit with isolation and reverse polarity circuits
Ping Chen, Shanghai (CN); Hui Yan, Shanghai (CN); Vincenzo Randazzo, Biancavilla (IT); Alberto Marzo, Giarre (IT); and Andrea Camillo Re, Valverde (IT)
Assigned to STMicroelectronics S.r.l., Agrate Brianza (IT); and STMicroelectronics (China) Investment Co., Ltd., Shanghai (CN)
Filed by STMicroelectronics (China) Investment Co., Ltd., Shanghai (CN); and STMicroelectronics S.r.I., Agrate Brianza (IT)
Filed on Jun. 20, 2022, as Appl. No. 17/844,306.
Prior Publication US 2023/0411953 A1, Dec. 21, 2023
Int. Cl. H02H 7/18 (2006.01); H02H 1/00 (2006.01)
CPC H02H 7/18 (2013.01) [H02H 1/0007 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A circuit for reverse battery protection, the circuit comprising:
an isolation circuit coupled between a gate output of an electronic fuse (E-fuse) and at least one metal-oxide-semiconductor field-effect transistor (MOSFET), the at least one MOSFET being external to the E-fuse and the isolation circuit and coupled to a battery voltage pin, the E-fuse coupled between the battery voltage pin and a ground pin and further coupled to a microcontroller, the microcontroller being coupled between the battery voltage pin and the ground pin, the isolation circuit configured to disconnect the gate output from the at least one MOSFET when a battery is installed with reverse polarity; and
a reverse polarity circuit coupled between the ground pin and the at least one MOSFET, the reverse polarity circuit configured to turn on the at least one MOSFET when the battery is installed with the reverse polarity.