US 12,142,938 B2
HW and methods for improving safety protocol in wireless chargers
Yannick Guedon, Singapore (SG)
Assigned to STMicroelectronics Asia Pacific Pte Ltd., Singapore (SG)
Filed by STMicroelectronics Asia Pacific Pte Ltd., Singapore (SG)
Filed on Jan. 15, 2024, as Appl. No. 18/412,718.
Application 18/412,718 is a division of application No. 18/158,462, filed on Jan. 23, 2023, granted, now 11,909,223.
Application 18/158,462 is a division of application No. 17/374,840, filed on Jul. 13, 2021, granted, now 11,588,344, issued on Feb. 21, 2023.
Application 17/374,840 is a division of application No. 16/413,283, filed on May 15, 2019, granted, now 11,095,146, issued on Aug. 17, 2021.
Prior Publication US 2024/0154460 A1, May 9, 2024
Int. Cl. H02J 50/10 (2016.01); H02J 7/00 (2006.01); H02J 50/12 (2016.01); H02J 50/80 (2016.01)
CPC H02J 50/10 (2016.02) [H02J 7/0029 (2013.01); H02J 50/12 (2016.02); H02J 50/80 (2016.02)] 20 Claims
OG exemplary drawing
 
1. An over-voltage protection circuit, comprising:
a first comparator, a first input of the first comparator coupled to an output of a rectifier, a second input of the first comparator configured to receive a first threshold voltage;
a first differential amplifier having a first input coupled to the output of the rectifier, a second input of the first differential amplifier coupled to an output of a voltage regulator, the voltage regulator coupled to the rectifier and configured to convert a direct current voltage from the rectifier to a first regulated direct current voltage;
a second comparator, a first input of the second comparator coupled to an output of the voltage regulator, a second input of the second comparator configured to receive a second threshold voltage;
a second differential amplifier having a first input coupled to an output of the first differential amplifier, a second input of the second differential amplifier coupled to a first reference voltage;
a third comparator, a first input of the third comparator coupled to the output of the first differential amplifier, a second input of the third comparator coupled to a second reference voltage;
a multiplexer having a first input coupled to the output of the first comparator, a second input of the multiplexer coupled to an output of the second comparator, and a third input of the multiplexer coupled to an output of the third comparator;
a switch, an input of the switch coupled to the output of the second differential amplifier, a control terminal of the switch coupled to an output of the multiplexer; and
a regulating circuit, an input of the regulating circuit coupled to the output of the voltage regulator, a control terminal of the regulating circuit coupled to the output of the switch.