Gate drive circuit with a voltage stabilizer and a method
First Claim
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1. A gate drive circuit with an active gate voltage stabilizer, comprising:
- means for creating a bipolar voltage to a gate of an IGB power transistor; and
means for compensating for Miller currents of the IGB power transistor, the means for compensating being formed by a switching element connected in series with a capacitor between the gate and a supply voltage input;
wherein a switching voltage of the switching element is controlled by two resistances; and
wherein one of the two resistances is connected between a source and gate of the switching element, and is an NTC-resistor.
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Abstract
A gate drive circuit creates a bipolar voltage to a gate of an IGB power transistor, and compensates for Miller currents of the IGB power transistor. The compensating is performed by a switching element connected in series with a capacitor between the gate (X4) and a supply voltage.
24 Citations
20 Claims
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1. A gate drive circuit with an active gate voltage stabilizer, comprising:
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means for creating a bipolar voltage to a gate of an IGB power transistor; and means for compensating for Miller currents of the IGB power transistor, the means for compensating being formed by a switching element connected in series with a capacitor between the gate and a supply voltage input; wherein a switching voltage of the switching element is controlled by two resistances; and wherein one of the two resistances is connected between a source and gate of the switching element, and is an NTC-resistor. - View Dependent Claims (2, 3, 4, 12, 13)
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5. A method for controlling an IGB power transistor with a gate drive circuit, which method comprises:
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creating a bipolar voltage to a gate of the IGB power transistor; compensating for Miller currents of the IGB power transistor with a switching element connected in series with a capacitor between the gate and supply voltage input; and controlling a switching voltage of the switching element by two resistances; wherein one of the two resistances is a resistor connected between a source and gate of the switching element, and is an NTC-resistor. - View Dependent Claims (6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20)
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Specification