US 11,936,288 B2
Discharge of an AC capacitor using totem-pole power factor correction (PFC) circuitry
Ghafour Benabdelaziz, Tours (FR); and Laurent Gonthier, Taipei (TW)
Assigned to STMicroelectronics (Tours) SAS, Tours (FR); and STMicroelectronics LTD, Kowloon (HK)
Filed by STMicroelectronics (Tours) SAS, Tours (FR); and STMicroelectronics LTD, Kowloon (HK)
Filed on Dec. 13, 2021, as Appl. No. 17/548,754.
Application 17/548,754 is a division of application No. 16/858,907, filed on Apr. 27, 2020, granted, now 11,228,239.
Prior Publication US 2022/0103062 A1, Mar. 31, 2022
Int. Cl. H02M 1/42 (2007.01); H02M 1/32 (2007.01); H02M 7/155 (2006.01); H02M 7/217 (2006.01)
CPC H02M 1/4208 (2013.01) [H02M 7/1557 (2013.01); H02M 7/217 (2013.01); H02M 1/322 (2021.05)] 32 Claims
OG exemplary drawing
 
1. A circuit, comprising:
a first capacitor having first and second electrodes respectively coupled to first and second power supply input nodes;
a first switching transistor having a conduction path coupled between the first power supply input node and a first DC node;
a second switching transistor having a conduction path coupled between the first power supply input node and a second DC node;
a first thyristor having a conduction path coupled between the second power supply input node and the first DC node;
a second thyristor having a conduction path coupled between the second power supply input node and the second DC node;
a resistor coupled between the second power supply input node and an intermediate node;
a third thyristor having a conduction path coupled between the intermediate node and the first DC node;
a fourth thyristor having a conduction path coupled between the intermediate node and the second DC node; and
a control circuit configured to sense a disconnection of input power to the first and second power supply input nodes and in response thereto turn on one of the first and second switching transistors and one of the third and fourth thyristors to discharge the first capacitor through the resistor.