Current controlled electronic circuit for a hot wire air flow me

Details Current controlled electronic circuit for a hot wire air flow me Current controlled electronic circuit for a hot wire air flow me

1988-09-30

1990-07-03

Myracle, Jerry W.

Measuring and testing

Volume or rate of flow

Thermal type

731182, G01F 168

Patent

active

049380613

ABSTRACT:
A current controlled electronic circuit for a hot wire air flow meter having a symmetrical bridge circuit to measure the mass of the airflow. The present current bridge arrangement requires very few adjustments to select a few resistors for obtaining a required temperature differential and compensation for variations in the temperature coefficient of resistance of both the heated and cold resistors. This is accomplished by placing of a voltage divider in parallel with the sensing leg and a first amplifier responding to the voltage divider and the sensing let to control the current in the compensation leg. A second amplifier responds to the compensation leg for controlling the power to the sensing leg.

REFERENCES:
patent: 4672847 (1987-06-01), Uchiyama et al.

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