Load current sensing technique

Details Load current sensing technique Load current sensing technique

2004-08-11

2009-02-10

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

Reexamination Certificate

active

07489489

ABSTRACT:
Methods and apparatus regulate the output of a switching device to a voltage near that of saturation. In the preferred embodiment, this is accomplished for a small period of time during activation before and/or after device saturation. The switching device drive requirement is then measured to attain the regulated voltage. Measurement of the drive requirement during the small period of time correlates to switching driver current, being reliant on the finite gain of the switching device.

REFERENCES:
patent: 3982174 (1976-09-01), Maddox
patent: 4809122 (1989-02-01), Fitzner
patent: 6377118 (2002-04-01), Shigaki et al.
patent: 6680837 (2004-01-01), Buxton
patent: 2008/0129266 (2008-06-01), Endo et al.

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