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Switching control circuit for target switching element

  • US 9,444,446 B2
  • Filed: 07/03/2014
  • Issued: 09/13/2016
  • Est. Priority Date: 07/04/2013
  • Status: Active Grant
First Claim
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1. A switching control circuit for controlling one of charge and discharge of a control terminal of a target switching element to perform a corresponding one of turn-on and turn-off of the target switching element, the switching control circuit comprising:

  • a first discharge path connected to the control terminal of the target switching element for discharging the control terminal thereof, the first turn-off path having a first impedance;

    a first switching element mounted on the first discharge path and configured to perform one of closing the first discharge path and opening the first discharge path;

    a second discharge path connected to the control terminal of the target switching element for discharging the control terminal thereof, the second discharge path having a second impedance lower than the first impedance and being provided to address a first type of abnormality;

    a second switching element mounted on the second discharge path and configured to perform one of closing the second discharge path and opening the second discharge path;

    a third discharge path connected to the control terminal of the target switching element for discharging the control terminal thereof, the third discharge path having a third impedance higher than the first impedance and being provided to address a second type of abnormality different from the first type of abnormality;

    a third switching element mounted on the third discharge path and configured to perform one of closing the third discharge path and opening the third discharge path;

    a determiner that determines whether there is one of the first type of abnormality and the second type of abnormality in at least one of the target switching element and the switching control circuit; and

    a controller that;

    controls the second switching element to close the second discharge path when it is determined that there is the first type of abnormality;

    disables closing of the third discharge path while the second discharge path is closed by the second switching element;

    controls the third switching element to close the third discharge path when it is determined that there is the second type of abnormality; and

    disables closing of the second discharge path while the third discharge path is closed by the third switching element.

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