Switching element driving circuit
First Claim
1. A switching element driving circuit comprisinga push-pull buffer circuit driving a switching element to be driven, the push-pull buffer circuit amplifying electrical power of a switching control signal and transmitting the amplified switching control signal to a control terminal of the switching element to be driven, wherein:
- in the push-pull buffer circuit, switching elements of different polarities are connected in series, as buffer elements, between a first potential and a second potential lower in potential than the first potential;
a connecting point between control terminals of an upper-stage buffer on a side of the first potential and a lower-stage buffer on a side of the second potential serves as an input;
a connecting point between input and output terminals of the upper-stage buffer and the lower-stage buffer serves as an output;
an upper-stage current limiting resistor is provided between the first potential and the upper-stage buffer;
a lower-stage current limiting resistor is provided between the second potential and the lower-stage buffer;
the switching control signal is inputted to the input; and
the output is connected to the control terminal of the switching element to be driven,a compensation resistor that connects the input to the output; and
an input-side pull-down resistor that connects the input to a negative polarity side of the switching element to be driven,wherein a sum of a resistance value of the compensation resistor and a resistance value of the input-side pull-down resistor is set to be smaller than a resistance value between the control terminal of the switching element to be driven and an emitter terminal or a source terminal of the switching element, and to be larger than a resistance value of the lower-stage current limiting resistor.
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Accused Products
Abstract
A switching element driving circuit that includes a push-pull buffer circuit driving a switching element to be driven, the push-pull buffer circuit amplifying electrical power of a switching control signal and transmitting the amplified switching control signal to a control terminal of the switching element to be driven; a compensation resistor that connects the input to the output; and an input-side pull-down resistor that connects the input to a negative polarity side of the switching element to be driven.
3 Citations
3 Claims
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1. A switching element driving circuit comprising
a push-pull buffer circuit driving a switching element to be driven, the push-pull buffer circuit amplifying electrical power of a switching control signal and transmitting the amplified switching control signal to a control terminal of the switching element to be driven, wherein: -
in the push-pull buffer circuit, switching elements of different polarities are connected in series, as buffer elements, between a first potential and a second potential lower in potential than the first potential; a connecting point between control terminals of an upper-stage buffer on a side of the first potential and a lower-stage buffer on a side of the second potential serves as an input; a connecting point between input and output terminals of the upper-stage buffer and the lower-stage buffer serves as an output; an upper-stage current limiting resistor is provided between the first potential and the upper-stage buffer; a lower-stage current limiting resistor is provided between the second potential and the lower-stage buffer; the switching control signal is inputted to the input; and the output is connected to the control terminal of the switching element to be driven, a compensation resistor that connects the input to the output; and an input-side pull-down resistor that connects the input to a negative polarity side of the switching element to be driven, wherein a sum of a resistance value of the compensation resistor and a resistance value of the input-side pull-down resistor is set to be smaller than a resistance value between the control terminal of the switching element to be driven and an emitter terminal or a source terminal of the switching element, and to be larger than a resistance value of the lower-stage current limiting resistor. - View Dependent Claims (2, 3)
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Specification