Electric lamp and discharge devices: systems – Plural diverse-type load devices – Series connected diverse-type load devices
Patent
1985-08-08
1986-12-02
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Plural diverse-type load devices
Series connected diverse-type load devices
315245, 315 49, 315290, H05B 3500, H05B 3700, H05B 3900, H05B 4100
Patent
active
046267450
ABSTRACT:
A ballast circuit arrangement for providing a predetermined desired A.C. voltage to enhance the operation of the gas discharge tube serving as the main light source in a lighting unit of the type which also comprises an incandescent filament serving as a resistive element and a supplementary light source is disclosed. The circuit arrangement operates directly from an applied 220 volt, 50 Hz or 120 volt, 60 Hz alternating current (A.C.) voltage source. The circuit arrangement comprises a capacitor connected serially with both the incandescent filament and the gas discharge tube. If desired, the incandescent filament may be replaced with a resistive element. The value of the capacitor is selected so as to reduce the applied 220 volt, 50 Hz or 120 volt, 60 Hz A.C. source to a desired range for operating the circuit in a manner to develop a desired reduced voltage for operation of the gas discharge tube. The reduced operating voltage correspondingly reduces the restrike voltage that may be necessary to operate the gas discharge tube during restrike conditions. The reduced operating voltage of the gas discharge tube readily allows for the development of the restrike voltage directly available from the typical 220 volts, 50 Hz or 120 volts, 60 Hz A.C. source. The circuit arrangement further provides for an automatic restrike voltage under reduced voltage A.C. source conditions.
REFERENCES:
patent: 3781594 (1973-12-01), Roberts
patent: 4275337 (1981-01-01), Knoble et al.
patent: 4288725 (1981-09-01), Morton
patent: 4320325 (1982-03-01), Anderson
patent: 4350930 (1982-09-01), Peil et al.
patent: 4438369 (1984-03-01), Hicks et al.
Davenport John M.
von Herrmann Pieter J.
Chatmon Saxfield
General Electric Company
Jacob Fred
McMahon John P.
Schlamp Philip L.
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