Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Plural cathodes or heaters in the load device
Patent
1979-04-16
1980-12-02
Smith, Alfred E.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Plural cathodes or heaters in the load device
315105, 315205, 315DIG5, 315DIG7, H05B 4130, H05B 41392
Patent
active
042374030
ABSTRACT:
Electrical power is converted into rectangular waves, which are loosely coupled to a fluorescent lamp. A parallel tank circuit resonant near the fundamental or a harmonic of the square wave frequency is connected between the electrodes of the lamp. The electrodes of the lamp each have a pair of terminals across which an electrical potential is applied to heat the electrodes while starting the lamp. Power is applied across the first and second electrodes while starting the lamp and after starting the lamp. Power is also applied and/or the pair of terminals of the second electrode while starting the lamp and after starting the lamp. The ratio of voltage across the first and second electrodes to the voltage across the pair of terminals is such as to properly preheat the electrodes and prevent arcing between each pair of terminals, and arcing between the first and second electrodes while starting. After starting, these voltages drop to a much lower and proper value for continuous approximate sine wave operation and lamps thus have been protected and yield their longest life. In one embodiment, the power of the rectangular wave is controlled responsive to the current applied to the lamp to prevent generation of excessive power after the lamp is started.
REFERENCES:
patent: 2949565 (1960-08-01), Rohloff et al.
patent: 3089980 (1963-05-01), Neusbaum
patent: 3700956 (1972-10-01), Cluett
patent: 3889153 (1975-06-01), Pierce
patent: 3890537 (1975-06-01), Park et al.
Berkleonics, Inc.
Roberts Charles F.
Smith Alfred E.
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