Analyzer circuit an inductive position sensor

Details Analyzer circuit an inductive position sensor Analyzer circuit an inductive position sensor

1993-09-10

1995-06-13

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Position determining

331 65, G01B

Patent

active

054250730

ABSTRACT:
The analyzer circuit includes a first oscillator producing an output signal having a first frequency depending on an inductance of an inductive position sensor having two oscillator coils positioned near a movable part; a switching device in the first oscillator for alternatingly connecting one of the two coils and simultaneously disconnecting the other according to a state of the switching device; a frequency divider for converting the output signal at the first frequency to another output signal at another frequency; a counter for counting a pulse signal under control of the other output signal of the frequency divider; a second oscillator connected to the counter and providing input pulses at a fixed frequency to the counter, which counts the input pulses under control of the other output signal of the frequency divider; a start synchronizing circuit for starting and synchronizing the divider and the counter; a flip-flop connected to the frequency divider and to the switching device to switch the state of the switching device; and an arithmetic-logic unit connected to the counter to receive a count from it and having a device for generating a digital output signal characteristic of a position of the movable part relative to the oscillator coils according to the count.

REFERENCES:
patent: 4639689 (1987-01-01), Bartlett
patent: 4644570 (1987-02-01), Brosh et al.
patent: 5079523 (1992-07-01), Kleinhans

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