Device for periodically alternating bulb polarities of a DC fluo

Details Device for periodically alternating bulb polarities of a DC fluo Device for periodically alternating bulb polarities of a DC fluo

1990-08-29

1991-12-10

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Periodic-type current and/or voltage regulator in the supply...

315246, 315307, 315DIG5, 315DIG7, H05B 4116, H05B 4136

Patent

active

050721607

ABSTRACT:
A device for alternating the polarity of a regulated DC power signal applied to a fluorescent light system, which device selectively reverses the polarity of a DC power signal applied to a fluorescent lamp each time the light system is turned on and an AC power signal is applied. The device selects the polarity of the DC power signal applied to the lamp such that both terminals of the lamp act as a cathode approximately an equal number of times, thus preventing premature aging and degradation of any one lamp terminal.

REFERENCES:
patent: 3999100 (1976-10-01), Dendy et al.
patent: 4327309 (1982-04-01), Wallot
patent: 4356432 (1982-10-01), Vinarub
patent: 4914356 (1990-04-01), Cockram

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