Load driving device with diagnosing unit for overcurrent...

Details Load driving device with diagnosing unit for overcurrent... Load driving device with diagnosing unit for overcurrent...

2006-11-06

2008-11-25

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

C361S100000, C324S500000

Reexamination Certificate

active

07457089

ABSTRACT:
A load driving device for controlling a driving and a stop of a load through on/off switching of a semiconductor device under the control of a driving circuit, includes an overcurrent detecting unit that compares, with a prescribed judgment voltage, an inter-electrode voltage which is generated when a current flows between a first electrode and a second electrode of the semiconductor device, and judges that an overcurrent is flowing through the semiconductor device when the inter-electrode voltage is higher than the judgment voltage, and a diagnosing unit that performs a diagnosis as to whether the overcurrent detecting unit is operating normally in a state that the semiconductor device is a on-state. When the diagnosing unit judges that the overcurrent detecting unit is not operating normally, the diagnosing unit outputs an instruction signal for turning off the semiconductor device, to the driving circuit.

REFERENCES:
patent: 5909112 (1999-06-01), Kiyota et al.
patent: 6934139 (2005-08-01), Kumagai et al.
patent: 7149065 (2006-12-01), Baldwin et al.
patent: 2006/0001687 (2006-01-01), Bush et al.
patent: 2006/0187604 (2006-08-01), Ohshima
patent: 2006/0268484 (2006-11-01), Thurk et al.

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