Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1992-02-19
1998-11-24
Dinh, Tan
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315219, 315223, 315287, H05B 3700
Patent
active
058412417
ABSTRACT:
An electronic ballasting circuit provides high efficiency ballasting for most common types of fluorescent lamps. The circuit consists of a half-bridge inverter providing a substantially squarewave voltage across a series-combination of an inductor and a capacitor. The fluorescent lamp is connected in parallel circuit with the capacitor in such a way that the current flowing through the capacitor also flows through the lamp cathodes, thereby providing continuous low voltage heating therefor. The values of inductance and capacitance are so chosen that the series-combination has a natural resonance frequency that is substantially equal to or lower than the lowest frequency component present in the squarewave voltage. Because the lamp cathodes are connected in series with the L-C quasi-resonant circuit, the high voltage that may be generated across the capacitor due to its cooperative interaction with the inductor, is not present when the lamp is disconnected from the circuit; thereby rendering the lamp sockets free from electric shock hazard whenever the lamp is removed therefrom. The fluorescent lamps may be operated properly in either the instant-start or the rapid-start modes.
REFERENCES:
patent: 2997664 (1961-08-01), Jensen
patent: 3155875 (1964-11-01), Wenrich et al.
patent: 3250952 (1966-05-01), Barriball
patent: 3263122 (1966-07-01), Genuit
patent: 3305697 (1967-02-01), Neusbaum
patent: 3346821 (1967-10-01), Swyryd
patent: 3753071 (1973-08-01), Engel et al.
patent: 3778677 (1973-12-01), Kriege
patent: 3889153 (1975-06-01), Pierce
patent: 3968396 (1976-07-01), Clune
patent: 4008414 (1977-02-01), Agnew
patent: 4060752 (1977-11-01), Walker
patent: 4075476 (1978-02-01), Pitel
patent: 4117373 (1978-09-01), Alley
patent: 4158792 (1979-06-01), Kuroi et al.
patent: 4170747 (1979-10-01), Holmes
patent: 4184128 (1980-01-01), Nilssen
patent: 4251752 (1981-02-01), Stolz
patent: 4259614 (1981-03-01), Kohler
patent: 4277728 (1981-07-01), Stevens
patent: 4350929 (1982-09-01), Katoogi
patent: 4370600 (1983-01-01), Zansky
patent: 4388563 (1983-06-01), Hyltin
Dinh Tan
Nilssen Ole K.
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