Transducer temperature control circuit and method

Details Transducer temperature control circuit and method Transducer temperature control circuit and method

1987-03-06

1988-04-05

Wong, Peter S.

Electricity: power supply or regulation systems

Including an impedance

In a bridge

324DIG1, 73708, 73719, 73725, G01L 902, H03H 100

Patent

active

047361557

ABSTRACT:
An electronic control circuit for a bridge resistance circuit (10) of a transducer (20) has a switchable source of constant magnitude current (22) to direct current pulses of constant amplitude through the bridge circuit. A temperature setpoint detector (24) generates a temperature signal (TA) to a control logic circuit (26) when the circuit attains a predetermined temperature. The control logic circuit periodically turns on the current and directs a sample and hold network (32) to read the transducer output when the predetermined temperature is reached by enabling a gate (30). The control logic circuit turns off the current by applying a signal to the source of current after a reading of transducer output is taken. The current through the transducer develops its output, heats up the transducer and generates the temperature signal.

REFERENCES:
patent: 3967188 (1976-06-01), Spencer
patent: 4532468 (1985-07-01), Nishida et al.
patent: 4535283 (1985-08-01), Rabinovich et al.
patent: 4556807 (1985-12-01), Yamada et al.
patent: 4611163 (1986-09-01), Madeley
patent: 4667516 (1987-05-01), Schulz

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