Potentiometric circuit arrangement

Details Potentiometric circuit arrangement Potentiometric circuit arrangement

1991-02-12

1992-01-07

Wong, Peter S.

Electricity: power supply or regulation systems

Including an impedance

323354, 323298, 323367, 324714, G01R 2714

Patent

active

050795007

ABSTRACT:
A potentiometric circuit arrangement 30 is based on a resistive potentiometer tarck 11 with a capacitively coupled `wiper` 14', the resistive track being driven by switched alternating voltages of +/- V at 12 and -/+(X-V) at 13, where X is a reference voltage and V is the output of an integrator 15 to which the voltage sensed by the elecrode 37, and rectified at 36, is applied. A null voltage point establishes itself at the position of the electrode and stabilizes the integrator output at a d.c. voltage proportional to the distance of the `wiper` from the track end 12. Any `wiper` displacement taps a non-null signal which integrated applies new voltages to the track until the null point is re-established at the `wiper` position. The capacitive pick-up enables a potentiometer-type voltage output with less wear of the track, less drag against motion and less electrical noise, and electronic differentiation (27) of the position signal to give a rate signal. The arrangement is suited to use as an angle and rate sensor in a gyroscope 70 (FIG. 6).

REFERENCES:
patent: Re33028 (1989-08-01), Simpson
patent: 3308375 (1967-03-01), Numakura
patent: 3439258 (1969-04-01), Leeuwen
patent: 3922597 (1975-11-01), Nagase
patent: 3967188 (1976-06-01), Spencer
patent: 4415790 (1983-11-01), Diesch et al.
patent: 4830420 (1989-02-01), Steinbrecher et al.

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