Pulse-duty-cycle-type evaluation circuit for a variable inductan

Details Pulse-duty-cycle-type evaluation circuit for a variable inductan Pulse-duty-cycle-type evaluation circuit for a variable inductan

1980-10-09

1983-05-17

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324 59, G01B 714, B01D 520

Patent

active

043842518

ABSTRACT:
Repeated trigger pulses cause a comparator to put a transistor into its conducting condition, producing a rise in emitter-collector current dependent upon the inductance of a variable inductor. A voltage corresponding to this current is developed across a resistor in circuit with the inductor and is applied to the noninverting input of the comparator and when it reaches a threshold value, the comparitor switches and turns off a transistor, after which the reaction current in the inductor is dissipated through one or more resistors. The comparator output produces a step wave having a duty cycle proportional to the inductance value, a signal which is particularly useful when the inductor is a transducer producing an inductance that varies proportionately to a physical dimension or a pressure, particularly when these are operation parameters of an internal combustion engine.

REFERENCES:
patent: 3366874 (1968-01-01), Kuhne
patent: 3973191 (1976-08-01), Zabler

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