Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1995-06-07
1997-05-06
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
257547, 257560, H02H 300
Patent
active
056277156
ABSTRACT:
A circuit construction for biasing near a pocket containing a power supply potential circuit element in a junction-isolated circuit. In normal operation if the polarity of the supply voltage is reversed from that intended the pocket is disconnected. To achieve this, in one embodiment the emitter of a transistor is connected to the positve supply voltage. The collector of that transistor is used to bias the pocket, containing a circuit element, which in normal operation should receive the supply voltage. When the supply voltage is reversed, the emitter-base junction is reverse biased and the collector-base junction is turned off. The pocket is thus disconnected from the supply during supply reversal. The transistor may also have a second collector to handle reinjection of carriers when it is saturated. This second collector can be connected to the base or used by other circuits to detect when saturation occurs.
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Analog Devices Inc.
Gaffin Jeffrey A.
Leja Ronald W.
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