DRIVING CIRCUIT FOR SWITCHING ELEMENT AND POWER CONVERTER
First Claim
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1. A driving circuit for a switching element comprising:
- a control circuit configured to apply a control voltage to a first terminal of a switching element including the first terminal, a second terminal and a third terminal, and thereby to cause a main circuit current to flow in a main circuit between the second terminal and the third terminal; and
a protection circuit configured to protect the switching element when the main circuit current is an overcurrent, whereinthe protection circuit includes;
a potential decreasing unit configured to decrease a potential of the first terminal when the main circuit current is the overcurrent,a feedback unit configured to perform feedback control on an amount of a decrease in the potential of the first terminal caused by the potential decreasing unit according to a current amount of the main circuit current, anda phase advancing unit configured to perform phase advance compensation in a feedback loop under the feedback control.
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Abstract
A short-circuit protection circuit (12) configured to protect a switching element from an overcurrent includes: a potential decreasing means for decreasing a potential of a gate terminal when a main circuit current is an overcurrent; a feedback means for performing feedback control on an amount of a decrease in the gate potential caused by the potential decreasing means according to a current amount of the main circuit current; and a phase advancing means for performing phase advance compensation in a feedback loop under the feedback control.
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Citations
7 Claims
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1. A driving circuit for a switching element comprising:
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a control circuit configured to apply a control voltage to a first terminal of a switching element including the first terminal, a second terminal and a third terminal, and thereby to cause a main circuit current to flow in a main circuit between the second terminal and the third terminal; and a protection circuit configured to protect the switching element when the main circuit current is an overcurrent, wherein the protection circuit includes; a potential decreasing unit configured to decrease a potential of the first terminal when the main circuit current is the overcurrent, a feedback unit configured to perform feedback control on an amount of a decrease in the potential of the first terminal caused by the potential decreasing unit according to a current amount of the main circuit current, and a phase advancing unit configured to perform phase advance compensation in a feedback loop under the feedback control. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A driving circuit for a switching element comprising:
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a control circuit configured to apply a control voltage to a first terminal of a switching element including the first terminal, a second terminal and a third terminal, and thereby to cause a main circuit current to flow in a main circuit between the second terminal and the third terminal; and a protection circuit configured to protect the switching element when the main circuit current is an overcurrent, wherein the protection circuit includes; potential decreasing means for decreasing a potential of the first terminal when the main circuit current is the overcurrent, feedback means for performing feedback control on an amount of a decrease in the potential of the first terminal caused by the potential decreasing means according to a current amount of the main circuit current, and phase advancing means for performing phase advance compensation in a feedback loop under the feedback control.
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Specification