Solid-state dimmer for dual high pressure discharge lamps

Details Solid-state dimmer for dual high pressure discharge lamps Solid-state dimmer for dual high pressure discharge lamps

1975-03-18

1976-11-09

Grimm, Siegfried H.

Electric lamp and discharge devices: systems

Regulation of the control current and/or potential applied...

Plural load device systems

315247, 315255, 315258, 315272, 315297, 315DIG4, 315DIG7, H05B 4116, H05B 41392

Patent

active

039913449

ABSTRACT:
A lighting control apparatus to provide variable intensity light from high pressure discharge lamps using two high pressure discharge lamp loads connected in series to provide more widely variable intensity of light. The outputs of two ballasts may be connected in series to feed the series connected discharge lamp load. Preferably a feedback signal proportional to load current is used to stabilize operation. In addition, circuitry is preferably provided to maintain a predetermined minimum current to prevent extinguishing of the lamps from low current and "hot restrike" circuitry is provided to limit the maximum load voltage when the lamps are extinguished.

REFERENCES:
patent: 3816794 (1974-06-01), Snyder
patent: 3875458 (1975-04-01), Kappenhagen
patent: 3875460 (1975-04-01), Kappenhagen
patent: 3894265 (1975-07-01), Holmes et al.

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