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Overcurrent protection circuit of power device and semiconductor integrated circuit device

  • US 5,375,029 A
  • Filed: 09/14/1993
  • Issued: 12/20/1994
  • Est. Priority Date: 10/09/1992
  • Status: Expired due to Fees
First Claim
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1. A circuit for protecting a power device from overcurrent, said power device having a sensing electrode from which a sensing signal related to a main current flowing through a main current path of said power device is obtained, said circuit comprising:

  • driver means for receiving an input signal to generate a control signal and for supplying said control signal to a control electrode of said power device;

    reference signal generator means for generating first and second reference signals, a level of said second reference signal being higher than a level of said first reference signal;

    pulse generator means for generating a pulse in response to activation of said input signal;

    selector means for selecting one of said second and first reference signals in response to activation and inactivation of said pulse, respectively, to obtain a selected reference signal; and

    comparator means for comparing said sensing signal with said selected reference signal to generate a drive control signal which is supplied to said driver means to disable said driver means.

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