Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1991-11-15
1993-06-01
Mis, David
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315106, 315209R, 315226, 315DIG5, H05B 4136
Patent
active
052163326
ABSTRACT:
A magnetic-electronic ballast consists of a symmetrical series-combination of two ordinary magnetic ballast reactors and an electronically controllable connection and cathode heating means; which connection/heating means has terminals by which to connect with two series-connected fluorescent lamps. The connection/heating means acts: i) to provide cathode heating prior to lamp ignition, ii) to constitute an open circuit as long as the lamps are properly operating, iii) to constitute a short circuit if ever any of the lamp cathode terminals were to be disconnected (or, if one of the cathodes were to become open-circuited), and iv) to cycle between a short circuit and an open circuit in case the lamps have become inoperable for reasons other than an open-circuited cathode. Hence, if one of the fluorescent lamps were to be disconnected from one of its sockets, the maximum voltage that could ever be provided at the lamp's other socket would be limited to half of 277 Volt; which is well within the maximum limits stipulated by U.L. as being acceptably safe.
REFERENCES:
patent: 4256992 (1981-03-01), Luursema
patent: 4451767 (1984-05-01), Goralnik
patent: 4588924 (1986-05-01), Luursema et al.
patent: 4642521 (1987-02-01), Smulders
patent: 4661745 (1987-04-01), Citino et al.
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