GATE DRIVE APPARATUS
First Claim
1. In a gate drive apparatus which is connected to a gate of a switching device of voltage drive type, and which outputs to the gate, gate signals that turn ON/OFF the switching device on the basis of ON/OFF gate control signals;
- a gate drive apparatus for either or both of the turn-ON operation and the turn-OFF operation, comprising;
a constant-current-pulse gate drive circuit which creates the gate signal as a constant-current output, a constant-voltage-pulse gate drive circuit which creates the gate signal as a constant-voltage output, and a decision switch circuit which switches the operation of said constant-current-pulse gate drive circuit and the operation of said constant-voltage-pulse gate drive circuit.
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Accused Products
Abstract
A gate drive apparatus including a constant-current-pulse gate drive circuit which creates a gate signal for a switching device as a constant-current output, a constant-voltage-pulse gate drive circuit which creates the gate signal as a constant-voltage output, and a decision/switch circuit which switches the operation of the constant-current-pulse gate drive circuit and the operation of the constant-voltage-pulse gate drive circuit. The variance of switching speeds attributed to the variances of threshold voltages and mirror voltages in a plurality of switching devices which are driven by the gate drive apparatus can be suppressed, and the variance of losses can be minimized.
73 Citations
19 Claims
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1. In a gate drive apparatus which is connected to a gate of a switching device of voltage drive type, and which outputs to the gate, gate signals that turn ON/OFF the switching device on the basis of ON/OFF gate control signals;
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a gate drive apparatus for either or both of the turn-ON operation and the turn-OFF operation, comprising; a constant-current-pulse gate drive circuit which creates the gate signal as a constant-current output, a constant-voltage-pulse gate drive circuit which creates the gate signal as a constant-voltage output, and a decision switch circuit which switches the operation of said constant-current-pulse gate drive circuit and the operation of said constant-voltage-pulse gate drive circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification