Direct drive ballast with delayed starting circuit

Details Direct drive ballast with delayed starting circuit Direct drive ballast with delayed starting circuit

1980-12-19

1983-07-05

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Plural power supplies

Condenser in one of the supply circuits

315DIG5, 315DIG7, 315160, 315175, 315223, H05B 3700, H05B 3900

Patent

active

043920853

ABSTRACT:
A delayed starting circuit for an electronic ballast system that includes an inverter coupled to a secondary voltage source. The starting circuit includes a voltage divider having an input coupled to a charge storage capacitance in the voltage source and an output coupled through a semiconductor switching device to an input of the inverter. The switching device remains non-conductive until the capacitance has been substantially charged, thereby protecting the inverter from transients encountered as a surge of charge is delivered to the capacitance subsequent to the initial energization of the ballast circuit.

REFERENCES:
patent: 4127795 (1978-11-01), Knoll
patent: 4188661 (1980-02-01), Bower et al.

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