Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1983-04-15
1985-06-25
Moore, David K.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315210, 315239, 315287, 363 97, 363 78, 315DIG2, 315DIG7, H05B 4124
Patent
active
045256489
ABSTRACT:
A DC/AC converter provided with two transistors (11 and 20) alternately conductive to supply current to an inductively stabilized discharge lamp (16, 15) to be connected to the converter. The lamp is connected in series with a primary winding (12) of a current transformer. A secondary winding (30, 31) of the transformer is connected to a timing circuit (32 to 35; 32' to 35') of a control device of the transistors. The timing circuit is provided with voltage-dependent elements, i.e. Zener diodes (35, 35'). The combination of the current transformer and the Zener diodes causes the frequency of the converter, during starting of the lamp, to be larger than during the operating condition of the lamp. This insures that the lamp electrodes are properly heated before the lamp ignites.
REFERENCES:
patent: 4060751 (1977-11-01), Anderson
patent: 4075476 (1978-02-01), Pitel
patent: 4259614 (1981-03-01), Kohler
patent: 4375608 (1983-03-01), Kohler
De Bijl Adrianus M. J.
Melai Henri A. I.
DeLuca Vincent
Franzblau Bernard
Mayer Robert T.
Moore David K.
U.S. Philips Corporation
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