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

1986-05-06

1988-03-22

Moore, David K.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315221, 315278, 315DIG7, 315219, H05B 3702

Patent

active

047331356

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 substantially 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).

REFERENCES:
patent: 3222572 (1965-12-01), Powell
patent: 3619713 (1971-11-01), Biega
patent: 3638070 (1972-01-01), Powell
patent: 3878431 (1975-04-01), Petrina
patent: 4075476 (1978-02-01), Pitel
patent: 4259616 (1981-03-01), Smith
patent: 4277726 (1981-07-01), Burke
patent: 4503362 (1985-03-01), Hanlet
patent: 4587461 (1986-05-01), Hanlet

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