Power reduction control for inductive lighting installation

Details Power reduction control for inductive lighting installation Power reduction control for inductive lighting installation

1992-03-10

1993-06-22

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315293, 315DIG7, 307141, G05F 100

Patent

active

052218775

ABSTRACT:
A control system for reducing power used by an inductive lighting installation, usually plural fluorescent lamps and a ballast, includes an A.C. power input circuit to the installation with a signal-actuated, normally-closed primary switch in series in the circuit; a signal-actuated normally-open secondary switch is in shunt with the load. The two switches are actuated substantially simultaneously in each half-cycle of the A.C. power input, once for power reduction for a time interval T1-T2 and once for harmonic distortion reduction for a time T3-T4 that encompasses each A.C. power zero-crossing time TX. The control system has N different timing programs for times T1-T2 and T3-T4, each program corresponding to one type of ballast. In each program times T3 and T4 are constant; only the times T1 and T2 are varied for a series of successively greater power reductions; the maximum power reduction may be as much as 30 to 40 percent. The system is provided with protection circuits to protect against unusual line or load voltage or current conditions.

REFERENCES:
patent: 3539812 (1970-11-01), Johnson
patent: 4147961 (1979-04-01), Elms
patent: 4350935 (1982-09-01), Spira
patent: 4453123 (1984-06-01), Erkman

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