Inverter device
AssigneeFuji Electric Co., Ltd.
InventorsKenichiro Ueki, Takao Ichihara
Life of this patent
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Abstract
The inverter device includes an IGBT bridge circuit, a drive block which has an upper arm photocoupler and a lower arm photocoupler, and a control block including a CPU which generates gate signals and supplies them to the photocouplers. The control block includes an upper arm shutdown circuit and lower arm shutdown circuit which individually shutdown the gate signals of the upper arm and lower arm IGBTs in accordance with shutdown signals input from the exterior, and the shutdown circuits carry out a shutdown operation in accordance with the shutdown signals, which have mutually inverted logics.
Claims5
An inverter device, comprising:
- a bridge circuit formed of a plurality of bridge-connected semiconductor switching elements having upper and lower arm semiconductor switching elements;
- a drive block having an upper arm photocoupler and a lower arm photocoupler which output drive signals for turning on and off the upper arm semiconductor switching elements and the lower arm semiconductor switching elements of the bridge circuit, respectively;
- and
- a control block including a drive signal generating circuit which generates the drive signals and supplies them to the upper arm photocoupler and the lower arm photocoupler,
- wherein the control block includes an upper arm shutdown circuit and a lower arm shutdown circuit which individually shutdown the drive signals of the upper arm semiconductor switching elements and the drive signals of the lower arm semiconductor switching elements in accordance with shutdown signals inputted from an exterior, and
- the upper arm shutdown circuit and the lower arm shutdown circuit carry out a shutdown operation in accordance with the shutdown signals, which have mutually inverted logics.
Dependencies are inferred from the claim text.