Patent ID: 11936288
Assignee: STMICROELECTRONICS S.R.L.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
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.