Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Plural circuit elements
Patent
1992-01-02
1993-09-21
Pascal, Robert J.
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Plural circuit elements
439243, 315 96, 315 97, 315 70, 315187, 315227R, 315228, 315244, 315276, H01J 744, H05B 3900
Patent
active
052472280
ABSTRACT:
An adaptor circuit used to enable stable, flicker-free operation of T8-type fluorescent lamps in a lighting fixture which already has a standard two-lamp, series-sequence, 40 watt, rapid-start type ballast installed therein. The adaptor circuit contains an isolation transformer for controlling the voltage supplied by the ballast to the T8-type fluorescent lamps and a frequency selective impedance modifier circuit for controlling the operating current supplied by the ballast to the T8-type fluorescent lamps at preselected frequencies. In one embodiment, the frequency selective impedance modifier circuit substantially eliminates the third harmonic component of the fundamental frequency of the operating current.
REFERENCES:
patent: 4163176 (1979-07-01), Cohen et al.
patent: 4613792 (1986-09-01), Kroessler
patent: 4758173 (1988-07-01), Northrop
patent: 4847536 (1989-07-01), Lowe et al.
patent: 5063328 (1991-11-01), Wolton
Bessone Carlo S.
GTE Products Corporation
Pascal Robert J.
Shingleton Michael B.
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