Resistance sensor and switch

Details Resistance sensor and switch Resistance sensor and switch

1989-09-11

1992-05-19

Stephan, Steven L.

Electricity: power supply or regulation systems

Including an impedance

In a bridge

324706, G01R 2702

Patent

active

051151880

ABSTRACT:
A circuit for detecting resistance changes in an electrically resistive device is disclosed. The circuit comprises a bridge circuit with first and second MOSFET transistors in adjacent arms of the bridge and the resistive device and a comparison resistor in the other adjacent arms of the bridge. The first MOSFET transistor is connected in series with the resistive device across input terminals of the bridge and the second MOSFET transistor is connected in series with the comparison resistor across the input terminals of the bridge. The drains of the transistors are connected together and the gates of the transistors are connected together. The resistance of the second transistor is higher than the resistance of the first transistor by a predetermined multiple and the resistance or the comparison resistor is greater than the nominal resistance of the resistive device by the same multiple. Accordingly, when the resistive device has resistance equal to its nominal value the voltage between the output terminals of the bridge is zero. If the resistance of the resistive device deviates from its nominal value the voltage at the output terminals of the bridge will vary correspondingly.

REFERENCES:
patent: 4229692 (1980-10-01), Graeme

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