Two-wire electronic dimming ballast for gaseous discharge lamps

Details Two-wire electronic dimming ballast for gaseous discharge lamps Two-wire electronic dimming ballast for gaseous discharge lamps

H - Electricity

05

B

315/29, 355/51

H05B 41/392 (2006.01) H05B 41/298 (2006.01)

Patent

CA 1174771

ABSTRACT OF THE DISCLOSURE A low cost high frequency electronic dimming ballast for gas discharge lamps is disclosed which elim- inates the need for external primary inductance or choke coils by employing leakage inductance of the transformer. The system is usable with either fluorescent or high in- tensity discharge lamps and alternate embodiments employ the push-pull or half-bridge inverters. Necessary leakage inductance and tuning capacitance are both located on the secondary of the transformer. Special auxiliary windings or capacitors are used to maintain necessary filament heating voltage during dimming of fluorescent lamps. A clamping circuit or auxiliary tuned circuit may be provided to prevent component damage due to over-voltage and over current if a lamp is removed during operation of the system.

387076

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