Self-regulating, no load protected electronic ballast system

Details Self-regulating, no load protected electronic ballast system Self-regulating, no load protected electronic ballast system

H - Electricity

01

J

315/66

H01J 1/00 (2006.01) H05B 37/02 (2006.01)

Patent

CA 1279090

SELF-REGULATING, NO LOAD PROTECTED ELECTRONIC BALLAST SYSTEM ABSTRACT A self-regulating, no load protected electronic ballast system (10) is provided which includes a power source (12) for actuating at least one gas discharge tube (66) with a regulated current and limited voltage to maintain the gas discharge tubes (66) input and output power at a predetermined value. The self-regulating, no load protected electronic ballast system (10) includes a filter circuit (11) coupled to the power source (12) with an induction circuit (15) coupled to the filter circuit (11). The induction circuit (15) has a tapped primary winding (42) providing an auto-transformer configuration for establishing the magnitude of the regulated current. The induction circuit (15) includes a trigger control winding (48) for generating a control current and further includes a no-load protection circuit (99) for generating a voltage across the gas discharge tube (66) responsive to the regulated current and for maintaining the output voltage at a predetermined value when the gas discharge tube (66) is decoupled from the electronic ballast system (10). In this manner, the output voltage of the ballast system (10) is sub- stantially reduced when the gas discharge tube (66) is electrically decoupled from the overall circuit resulting in a higher reliability and extended life of a particular gas discharge tube (66).

556577

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