Position-sensing circuit

Details Position-sensing circuit Position-sensing circuit

1988-04-27

1989-06-20

Salce, Patrick R.

Electricity: power supply or regulation systems

External or operator controlled

Phase controlled switching using electronic tube or a three...

323237, 323300, 315194, 324 63, 324 65R, G05F 502, G01R 2702

Patent

active

048412210

ABSTRACT:
A position-sensing circuit includes an elongated electrically-conductive element divided into two elongated segments. A conductor moves along the element, maintaining electrical contact with at least one of the segments. A first capacitor is connected to the conductor and a second capacitor is connected to one of the segments. When the conductor bridges a gap between the segments, a step-wise change in the time constant of the circuit results. This step-wise change precisely and reproducibly indicates the position of the conductor as being across the gap. The circuit finds particular advantage in a three-way dimming system that permits a remote switch to provide power to a load even if a dimmer that controls the load has been set to provide minimum or no power to the load.

REFERENCES:
patent: 4225808 (1980-09-01), Saraceni
patent: 4259619 (1981-03-01), Wall
patent: 4379237 (1983-04-01), Mosteller, Jr.
patent: 4482844 (1984-11-01), Schweer et al.
patent: 4563592 (1986-01-01), Yuhasz et al.
patent: 4567375 (1986-01-01), Jimerson et al.
patent: 4568876 (1986-02-01), Maisch
patent: 4689547 (1987-08-01), Rowen et al.
patent: 4693111 (1987-09-01), Arnold et al.
patent: 4745351 (1987-05-01), Rowen et al.
patent: 4772824 (1988-09-01), Gulledge
Lutron Brochure-Nova.sup.R Fluorescent Dimmers, P/N 362-026 (7/87).
Lutron Brochure-Nova.sup.R 3-Way System, P/N 360-213 (6/87).

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