Method for starting and operating a preheat type fluorescent lam

Details Method for starting and operating a preheat type fluorescent lam Method for starting and operating a preheat type fluorescent lam

1980-06-26

1982-09-14

La Roche, Eugene

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315 54, 315 62, 315284, 315291, 315283, 315DIG4, 315DIG5, H05B 4118, H05B 4140

Patent

active

043497683

ABSTRACT:
A method for starting and operating a preheat type fluorescent lamp includes a source of alternating current, a fluorescent lamp having a low impedance starting mode wherein current passes through one or more starting filaments and a high impedance operating mode wherein current passes through the length of the lamp, a starting switch directing current through the starting filaments in the lamp starting mode, and an inductor ballast having a magnetically permeable core operating in a saturated condition when the lamp is in the low impedance starting mode and in a non-saturated condition when the lamp is in the high impedance operating mode.

REFERENCES:
patent: 3924155 (1975-12-01), Vogeli

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