Power switch series circuit and control method thereof

摘要

The present invention provides a power switch series circuit and its control method. The power switch series circuit includes a plurality of series modules, a control module and a drive module. At least one series module has a power switch and a detection module, and the detection module includes a detection unit and an isolation unit, so as to detect the overvoltage and output a voltage detection signal based on the detected voltage. The control module receives the voltage detection signal and outputs the corresponding control signal. The drive module amplifies the control signal to drive each power switch to turn ON or turn OFF. The control module outputs the corresponding control signal to turn off each power switch when the overvoltage happens.

主权项

1. A power switch series circuit, comprising:
a first series module comprising a first power switch; a second series module adjacent to the first series module, comprising:
a second power switch having a first terminal, a second terminal connected to the first power switch and a third terminal connected to a third power switch of a third series module adjacent to the second series module, wherein the first series module, the second series module and the third series module are connected in series by a connection of the first power switch, the second power switch and the third power switch; anda detection module comprising a detection unit for detecting if a detected voltage between the second terminal and the third terminal of the second power switch is an overvoltage and an isolation unit for outputting a voltage detection signal based on the detected voltage; a control module electrically connected to the isolation unit for receiving the voltage detection signal and outputting a control signal corresponding to the voltage detection signal; and a drive module electrically connected to the control module, the first terminal of the second power switch, the first power switch and the third power switch, the drive module amplifying the control signal to drive the first power switch, the second power switch and the third power switch to turn ON or turn OFF; wherein when the detected voltage is higher than a first threshold voltage, the voltage detection signal is the overvoltage signal, and the control module outputs the control signal corresponding to the overvoltage signal, so as to turn OFF the first power switch, the second power switch and the third power switch.