Solid-state dimmer for dual high pressure disclosure lamps

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

H - Electricity

05

B

315/44

H05B 41/38 (2006.01) G05F 1/445 (2006.01) H05B 41/392 (2006.01)

Patent

CA 1058278

ABSTRACT OF THE DISCLOSURE 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.

248027

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