Apparatus for applying a variable voltage to an electric load

Details Apparatus for applying a variable voltage to an electric load Apparatus for applying a variable voltage to an electric load

1994-09-30

1995-12-19

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

323341, 307140, 315284, 336150, H05B 3702

Patent

active

054771137

ABSTRACT:
An apparatus for applying a variable voltage to an electric load utilizes a transformer with several taps to provide different voltage levels for the load. The load is connected to alternate taps by a switching device, which is operated by a control device responsive to short interruptions in the power supply to the load. Short interruptions in power can be generated by rapidly turning one or more existing power switches in circuit with the load off and on again, so remote control is possible from several locations. Apparatus with the above structure is particularly suitable while employing a toroidal transformer for dimmer control of halogen lamps.

REFERENCES:
patent: 652707 (1900-06-01), Wurts
patent: 2381768 (1945-08-01), Minneci
patent: 3011095 (1961-11-01), Kriechbaum
patent: 3331013 (1967-07-01), Cunningham
patent: 4117376 (1978-09-01), Andrews
patent: 4574223 (1986-03-01), Pitel
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patent: 4651061 (1987-03-01), Spissinger
patent: 4802073 (1989-01-01), Plumly
patent: 4837455 (1989-06-01), Sleator
patent: 5194781 (1993-03-01), Konopka
patent: 5208516 (1993-05-01), Saidian
patent: 5239205 (1993-08-01), Hoffman et al.
patent: 5361019 (1994-11-01), Angott et al.

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