Patent ID: 7319579
Filing Date: 2008-01-15
Classification: H02H

Abstract:
1. A snubber circuit including a protection circuit connected to a first terminal, a second terminal, and a control input terminal, comprising: a voltage detecting circuit including a capacitor and a diode connected in series between the first and second terminals, or between the first terminal and the control input terminal; the protection circuit connected between the first and second terminals, configured to prevent an overvoltage between the first and second terminals in accordance with a voltage of the control input terminal; and a voltage control circuit configured to bypass a portion of a main current flowing between the first and second terminals to the protection circuit when a voltage at both ends of the capacitor exceeds a predetermined voltage, wherein a cathode electrode of the diode is connected to a side of the first terminal, and an anode electrode of the diode is connected to a side of the second terminal or the control input terminal having a voltage lower than a voltage of the first terminal.