Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1992-03-18
1993-10-26
Pascal, Robert J.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315242, 315 97, 315DIG5, H05B 4114
Patent
active
052569390
ABSTRACT:
A magnetic-type ballast powers an F40/T12 four foot fluorescent lamp from a regular 120 Volt/60 Hz power line by way of a main inductor. A power factor correction capacitor is connected in series with an auxiliary inductor of relatively small inductance value, thereby forming a series-combination; which series-combination is connected across the power line. A 30 Volt/60 Hz voltage is established across this auxiliary inductor. The phasing of this 30 Volt/60 Hz voltage is opposite that of the 120 Volt/60 Hz power line voltage. Thus, by adding the 30 Volt/.alpha.Hz voltage to the 120 Volt/60 Hz voltage, a 150 Volt/60 Hz voltage is obtained; which 150 Volt/60 Hz voltage is of magnitude adequate to properly power the F40/T12 four foot fluorescent lamp, although it is not of magnitude adequate to provide proper lamp ignition in a rapid-start mode.
A small inverter-type power supply is used for providing cathode heating power to the lamp's thermionic cathodes as well as for providing lamp ignition voltage by way of a relatively high-magnitude (250 Volt) high-frequency (30 kHz) voltage supplied to the lamp through a high-pass filter and operative to rapid-start the lamp. After the lamp has been rapid-started by this 250 Volt/30 kHz ignition voltage, it is ready to be properly powered by the 150 Volt/60 Hz voltage.
After lamp ignition, power output from the power supply is halted, thereby removing both cathode heating power as well as lamp ignition voltage.
REFERENCES:
patent: 3710177 (1973-06-01), Ward
patent: 4184128 (1980-01-01), Nilssen
patent: 4306177 (1981-12-01), Koneda
patent: 4399391 (1983-08-01), Hammer et al.
patent: 4453109 (1984-06-01), Stupp et al.
patent: 4507698 (1985-03-01), Nilssen
Neyzari Ali
Pascal Robert J.
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