Hot wire air flow meter

Details Hot wire air flow meter Hot wire air flow meter

1990-06-14

1993-01-26

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320418, G01F 168

Patent

active

051814200

ABSTRACT:
The present specification discloses a hot wire air flow meter with high circuit stability. The hot wire type air flow meter comprises a hot wire located in an air flow path to be measured and to which current is supplied from the external, a circuit for detecting a value of current flowing through the hot wire, an amplifying circuit including an inverting input terminal, a non-inverting input terminal to which a value detected in the current detecting circuit is applied, and an output terminal to which an output of an air-flow function is applied, a feedback circuit for supplying a feedback output to any terminal except the non-inverting input terminal of the amplifying circuit and controlling the output of the amplifying circuit to keep the temperature of the hot wire stable according to the output of the amplifying circuit, and a circuit for compensating for a phase of an output of the amplifying circuit contained in the feedback circuit.

REFERENCES:
patent: 4311042 (1982-01-01), Hosoya et al.
patent: 4400974 (1983-08-01), Nishimura et al.
patent: 4523462 (1985-06-01), Kolodjski
patent: 5036702 (1991-08-01), Akamatsu et al.

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