Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Plural discharge devices and/or rectifiers in the supply...
Patent
1981-09-30
1983-08-23
La Roche, Eugene R.
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Plural discharge devices and/or rectifiers in the supply...
315105, 315208, 315209R, 315246, H05B 3909
Patent
active
044006519
ABSTRACT:
A method and circuit for operating an incandescent lamp are disclosed in which the operating voltage applied to the lamp alternates in a regular and abrupt manner between forward and reverse polarities. The magnitude of the voltage is substantially the same for the two polarities and, therefore, the luminosity of the lamp is substantially constant. However, lamp life is increased as compared to standard DC operation since the alternating polarity of the operating voltage reduces the rate at which the lamp fails due to lamp filament breakage.
REFERENCES:
patent: 2838675 (1958-06-01), Wanlass
patent: 3078379 (1963-02-01), Plogstedt et al.
patent: 3175100 (1965-03-01), LaMothe
patent: 3376491 (1968-04-01), Mas
patent: 3461405 (1969-08-01), Bishop et al.
Dr. Johannes Heidenhain GmbH
La Roche Eugene R.
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