Apparatus for controlling insulating gate-type semiconductor element, and power conversion apparatus using apparatus for controlling insulating gate-type semiconductor element
First Claim
1. An apparatus for controlling an insulating gate-type semiconductor element provided with a first insulating gate and a second insulating gate, the apparatus being adapted to drive the insulating gate-type semiconductor element by a first control voltage and a second control voltage that are supplied to the first insulating gate and the second insulating gate, respectively, and comprising:
- a current detector comprising a sensing portion of the insulating gate-type semiconductor element and a sensing resistance, the current detector outputting a signal about current that passes through the insulating gate-type semiconductor element;
a first noise filter inputting the signal which the current detector outputs;
a first comparator making a comparison between an output signal of the first noise filter and an output signal of a first reference voltage source and outputting a first comparison result;
a first control voltage output circuit; and
a second control voltage output circuit,wherein the second control voltage output circuit is adapted to reduce the second control voltage when it is determined from the first comparison result that overcurrent passes through the insulating gate-type semiconductor element;
the first control voltage output circuit being adapted to reduce the first control voltage after the second control voltage is reduced,wherein the apparatus further includes a second noise filter inputting the signal which the current detector outputs, and a second comparator making a comparison between an output signal of the second noise filter and an output signal of a second reference voltage source and outputting a second comparison result, andwherein the second control voltage output circuit is adapted to reduce the second control voltage when it is determined from the second comparison result that the overcurrent passes through the insulating gate-type semiconductor element.
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Accused Products
Abstract
An apparatus is adapted to drive an insulating gate-type semiconductor element by a first control voltage and a second control voltage, that are supplied to a first insulating gate and a second insulating gate, respectively, and includes a first noise filter inputting a signal about current that passes through the insulating gate-type semiconductor element, a first comparator making a comparison between an output signal of the first noise filter and a first reference signal and outputting a first comparison result, a first control voltage output circuit, and a second control voltage output circuit, the second control voltage output circuit being adapted to reduce the second control voltage when it is determined from the first comparison result that overcurrent passes through the insulating gate-type semiconductor element, the first control voltage output circuit being adapted to reduce the first control voltage after the second control voltage is reduced.
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Citations
13 Claims
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1. An apparatus for controlling an insulating gate-type semiconductor element provided with a first insulating gate and a second insulating gate, the apparatus being adapted to drive the insulating gate-type semiconductor element by a first control voltage and a second control voltage that are supplied to the first insulating gate and the second insulating gate, respectively, and comprising:
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a current detector comprising a sensing portion of the insulating gate-type semiconductor element and a sensing resistance, the current detector outputting a signal about current that passes through the insulating gate-type semiconductor element; a first noise filter inputting the signal which the current detector outputs; a first comparator making a comparison between an output signal of the first noise filter and an output signal of a first reference voltage source and outputting a first comparison result; a first control voltage output circuit; and a second control voltage output circuit, wherein the second control voltage output circuit is adapted to reduce the second control voltage when it is determined from the first comparison result that overcurrent passes through the insulating gate-type semiconductor element;
the first control voltage output circuit being adapted to reduce the first control voltage after the second control voltage is reduced,wherein the apparatus further includes a second noise filter inputting the signal which the current detector outputs, and a second comparator making a comparison between an output signal of the second noise filter and an output signal of a second reference voltage source and outputting a second comparison result, and wherein the second control voltage output circuit is adapted to reduce the second control voltage when it is determined from the second comparison result that the overcurrent passes through the insulating gate-type semiconductor element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification