Apparatus for driving hot-wire type flow sensor

Details Apparatus for driving hot-wire type flow sensor Apparatus for driving hot-wire type flow sensor

1980-10-02

1982-06-08

Shoop, William M.

Electricity: power supply or regulation systems

Including an impedance

In a bridge

323283, 307353, 123494, F02M 5100

Patent

active

043341861

ABSTRACT:
An apparatus for driving a hot-wire air-flow sensor of constant temperature difference type includes a hot wire and a temperature sensitive compensating element such as a resistor for compensating temperature of air. The hot wire and the resistor are formed of identical elements. A pulse train signal having a pulse width varying in correspondence to difference between voltage drops produced, respectively, across the hot wire and the compensating resistor supplied with a constant current is produced for interrupting the current supplied to the hot wire.

REFERENCES:
patent: 3602826 (1971-08-01), List et al.
patent: 3605008 (1971-09-01), Shoemaker
patent: 3796198 (1974-03-01), Mauch et al.
patent: 3943434 (1976-03-01), Haeusler et al.
patent: 4028642 (1977-06-01), Kushida et al.
patent: 4058089 (1977-11-01), Schmidt et al.
patent: 4143550 (1979-03-01), Kobayashi

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