Power-line, differential, isolation loss detector

Details Power-line, differential, isolation loss detector Power-line, differential, isolation loss detector

2006-05-09

2006-05-09

Easthom, Karl D. (Department: 2838)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

C361S063000, C361S064000, C361S065000, C361S066000, C361S103000

Reexamination Certificate

active

07042690

ABSTRACT:
In one embodiment, an integrated differential isolation loss detector is disclosed that generates a first temperature that is a function of a high side current and a second temperature that is a function of a low side current. A temperature sensor senses the difference between the first and second temperatures and provides an output signal that is indicative of the magnitude and the polarity of the sensed difference. A controller receives the output signal and if the difference is greater than a predetermined magnitude the high side current, the low side current, or both can be disconnected from the load.In another embodiment, an integrated differential isolation loss detector is disclosed that includes a first temperature difference generator that generates first and second temperatures where the difference between the first and second temperatures is a function of the magnitude of the high side current. The integrated differential isolation loss detector further includes a second temperature difference generator coupled to the low side current that generates third and fourth temperatures where the difference between the third and fourth temperatures is a function of the magnitude of the low side current. A second temperature sensor senses the difference between the third and fourth temperatures and provides a second output signal that is indicative of the magnitude and the polarity of the sensed difference. A controller receives the first and second output signals and if the difference between the two output signals is greater than a predetermined magnitude the high side current, the low side current, or both can be disconnected from the load.

REFERENCES:
patent: 6531899 (2003-03-01), Male
patent: 6639395 (2003-10-01), Male

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