Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1984-01-09
1986-12-02
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315210, 315161, 315312, 362148, 361377, H05B 3702, H05B 3904, H05B 4136
Patent
active
046267476
ABSTRACT:
A lighting system for a suspended ceiling comprises a plurality of power conditioning units permanently wired-in with the 120 Volt/60 Hz power line and mounted in various suitable locations on the permanent ceiling above the suspended ceiling. Each such power conditioning unit provides a power-limited Class-3 high-frequency voltage at an output receptacle and is operable to power a special fluorescent lighting fixture by way of a light-weight flexible two-wire detachable connect cord. Special fluorescent lighting fixtures are mounted in the suspended ceiling, with each such lighting fixture being powered from a power conditioning unit mounted somewhere nearby on the permanent ceiling above. Due to the Class-3 power-limited nature of the output of each of the power conditioning units, as combined with the light-weight flexible and detachable nature of the connect cords, each special lighting fixture may be treated as a plug-in portable lighting product; which implies a particularly high degree of flexibility in installation and use. As a consequence of the high-frequency operation, the size and weight of the impedance matching means required in the special lighting fixture (to provide proper operation of the fluorescent lamp means therein) is very modest, which results in a particularly compact and light-of-weight lighting fixture.
REFERENCES:
patent: 3405315 (1968-10-01), Moreland, II
patent: 4293799 (1981-10-01), Roberts
patent: 4363082 (1982-12-01), Roland
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