Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1982-05-10
1985-08-27
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315DIG5, 315DIG7, 315205, 315283, 315227R, 331113A, 363 34, 363 40, H05B 3700, H05B 3900, H05B 4136
Patent
active
045380937
ABSTRACT:
An arrangement for starting and supplying a discharge lamp (14) equipped with preheatable electrodes (15, 16). An electric coil (13) is arranged in series with the lamp and a capacitor (17) is arranged in parallel with the lamp. A voltage of a high frequency is first applied between the ends (A, B) of the series arrangement formed by the coil (13) and the lamp (14) whereafter approximately 1 second later said frequency is reduced until a series resonant condition is obtained and thereafter still further reduced to the operating frequency of the lamp. This starts the lamp (14) with the electrodes preheated to a sufficient extent.
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patent: 4375608 (1983-03-01), Kohler
Chatmon Saxfield
Franzblau Bernard
Mayer Robert T.
U.S. Philips Corporation
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