Ballast adaptor for improving operation of fluorescent lamps

Details Ballast adaptor for improving operation of fluorescent lamps Ballast adaptor for improving operation of fluorescent lamps

1986-05-16

1987-10-20

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315232, 315242, 315278, H05B 3700, H05B 3900, H05B 4136

Patent

active

047016736

ABSTRACT:
A ballast adaptor circuit which makes it possible to convert a conventional two lamp rapid start T12 ballast for operation of two T8 fluorescent lamps and by means of a simple modification that does not require cutting wires or extensive rewiring of the T12 ballast device. The adaptor circuit comprises an auxiliary circuit including a tuned series-parallel LC network connected in parallel with either one or both of the lamps. The LC network is tuned to supply an odd harmonic current to the lamps, preferably the seventh harmonic. Improved starting is achieved by adding a series RC circuit and a SIDAC trigger device to the network to produce voltage pulses at the peaks of the AC supply voltage.

REFERENCES:
patent: 3225255 (1965-12-01), Hume
patent: 3305697 (1967-02-01), Neusbaum
patent: 3334270 (1967-08-01), Nuckolls
patent: 3418527 (1968-12-01), Miller
patent: 3859542 (1975-01-01), Kennedy
patent: 3881137 (1975-04-01), Thanawala
patent: 4005336 (1977-01-01), Casella
patent: 4190790 (1980-02-01), Plumb et al.
patent: 4399391 (1983-08-01), Hammer et al.
patent: 4631450 (1986-12-01), Lagree et al.

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