Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1986-03-18
1988-06-14
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 44, 363 37, 315 86, H02J 700, H02M 545
Patent
active
047513985
ABSTRACT:
A lighting system is provided having a central power supply which includes an AC to DC converter. The DC power is distributed to a plurality of ballast circuits for discharge lamps. Each ballast circuit includes an inverter circuit for inverting the DC power to AC power of sufficient voltage to operate the associated lamps. Should the AC input power for the central power supply fail, batteries may be provided to supply the DC power continuously without interruption.
The inverter circuits are operated at high frequency to reduce audible noise and eliminate noticeable strobing. The inverter circuit includes a switching circuit controlled by a pulse train. The duty cycle of the pulse train is controlled in accordance with a composite feedback signal which is the product of signals representative of the lamp operating voltage and lamp current.
REFERENCES:
patent: 3819980 (1974-06-01), Mullersman
patent: 3823358 (1974-07-01), Rey
patent: 3836815 (1974-09-01), Herzog
patent: 3925772 (1975-12-01), Miller et al.
patent: 4087697 (1978-05-01), Johnson
patent: 4238690 (1980-12-01), Clarke
patent: 4313060 (1982-01-01), Fickenscher et al.
patent: 4354118 (1982-10-01), Spencer
patent: 4392087 (1983-06-01), Zansky
patent: 4395639 (1983-06-01), Bring
patent: 4451773 (1984-05-01), Papathomas et al.
patent: 4477748 (1984-10-01), Grubbs
patent: 4506766 (1985-03-01), Watanabe
patent: 4562522 (1985-12-01), Adams et al.
Widelite Brochure, "Transistorized Arc Control Systems",undated.
Bodine Brochure, "Emergency Lighting", 1981.
Bodine Brochure, "Bodine Trans-Bal Inverter Ballasts", 1982.
General Electric Brochure, "Steadilux Ballasted Industrial Luminaires", undated.
Logan Sharon D.
Shoop Jr. William M.
The Bodine Company
LandOfFree
Lighting system for normal and emergency operation of high inten does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lighting system for normal and emergency operation of high inten, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lighting system for normal and emergency operation of high inten will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-506516