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US 2014/0192449 A1Published application
Short-circuit protection circuit
AssigneeFuji Electric Co., Ltd.
InventorNaoki Shimizu
Life of this patent
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Abstract
Provided is a short-circuit protection circuit having a mask circuit which can reduce a turn-on loss of a voltage-driven type semiconductor device during turn-on operation of the voltage-driven type semiconductor device. A mask circuit (21) is provided to suspend operation of an NLU circuit (24) during turn-on operation of a voltage-driven semiconductor device (1). Accordingly, the voltage-driven type semiconductor device (1) can be driven sufficiently so that a turn-on loss can be reduced.
Claims4
A short-circuit protection circuit for protecting a voltage-driven semiconductor device from short-circuit breakdown, comprising:
- a control circuit for generating a control voltage that is applied to a gate of the voltage-driven semiconductor device
- an NLU (Non-Latch-Up) circuit which changes the control voltage in order to prevent the voltage-driven semiconductor device from latching-up due to a current flowing into the voltage-driven semiconductor device;
- and
- a mask circuit which sets the NLU circuit at a non-operating state when the current flowing into the voltage-driven semiconductor device is at a level to operate the NLU circuit during a turn-on operation of the voltage-driven semiconductor device but a gate voltage of the voltage-driven semiconductor device is lower than a first reference voltage.
1 more element
Dependencies are inferred from the claim text.