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Snubber circuit

  • US 7,319,579 B2
  • Filed: 07/21/2005
  • Issued: 01/15/2008
  • Est. Priority Date: 07/22/2004
  • Status: Expired due to Fees
First Claim
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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.

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