Circuit for converting a temperature dependent input signal to a

Details Circuit for converting a temperature dependent input signal to a Circuit for converting a temperature dependent input signal to a

1975-10-03

1977-06-07

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

323 75H, 324 98, G01R 1702

Patent

active

040286428

ABSTRACT:
A bridge circuit for combination with a variable resistance sensor whose resistance may vary as a function of a sensed variable and also as a function of a parasitic variable such as, for example, temperature. The bridge circuit includes at least one variable resistance which varies as a function of the parasitic parameter and is relatively insensitive to the sensed parameter. The bridge circuit comprises a first leg incorporating the sensor resistor having a tap junction whose voltage varies as a function of the sensed parameter and of the parasitic parameter, a second leg including the parasitic parameter responsive resistance and having a voltage tap whose voltage varies only as a function of the parasitic parameter and a third leg interconnecting the first and second leg voltage taps and having a signal tap whose voltage varies only as a function of the sensed parameter. In a preferred embodiment, a resistance type exhaust gas sensor whose resistance varies as a function of the partial pressure of oxygen in the exhaust system of an internal combustion engine and also as a function of the temperature of the environment of the exhaust system is compensated by the circuit of the present invention to remove temperature dependency effects.

REFERENCES:
patent: 2278633 (1942-04-01), Bagnall
patent: 2947935 (1960-08-01), Sepmeyer
patent: 3278834 (1966-10-01), Perino

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