Output circuit for an electronic ballast system

Details Output circuit for an electronic ballast system Output circuit for an electronic ballast system

H - Electricity

05

B

315/54

H05B 41/36 (2006.01) H05B 41/282 (2006.01) H02M 7/5383 (2006.01)

Patent

CA 1238078

ABSTRACT An output circuit for an electronic ballast system includes N sets of output connections for accepting N lamps. The lamps are driven by an output autotransformer coupled to the lamps through a feedback winding that is used to apply a feedback signal to an inverter drive circuit. Capacitive impedances are coupled across the lamps so that the capacitances, the lamp filaments, the feedback winding, and the output transformer form a circuit loop. The capacitances are chosen to have an impedance, at the inverter operating frequency, less than the pre- ignition impedance of the lamps and greater than the post- ignition impedance.

430543

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