Electronic fluorescent lamp ballast with overload protection

Details Electronic fluorescent lamp ballast with overload protection Electronic fluorescent lamp ballast with overload protection

1983-05-17

1985-11-19

Boudreau, Leo H.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315225, 315127, 363 55, 361101, H05B 4124

Patent

active

045544875

ABSTRACT:
Subject invention relates to an inverter-type electronic fluorescent lamp ballast wherein a series-resonant LC circuit connected across the inverter's output is used for matching the inverter's operating characteristics to those of the fluorescent lamp--the fluorescent lamp being connected in parallel with the tank-capacitor of this LC circuit.
More particularly, the invention relates to the use of a Varistor coupled in parallel with this tank-capacitor, thereby limiting the voltage developed thereacross to a magnitude suitable for proper lamp starting. Moreover, by providing for means whereby the inverter shuts itself off in case current flows through this Varistor for a longer time than it should take for a fluorescent lamp to start, inverter overload protection is obtained. Without such overload protection the inverter would self-destruct in case the fluorescent lamp failed to start or if it were removed from the circuit.

REFERENCES:
patent: 3331003 (1967-07-01), Johnston
patent: 4370600 (1983-01-01), Zansky
patent: 4398126 (1983-08-01), Zuchtriegel
patent: 4406976 (1983-09-01), Wisbey et al.

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