Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit
Patent
1987-03-18
1989-08-29
Groody, James J.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Inductance in the condenser circuit
315219, 315278, 315282, 363132, 363 75, 331113A, H05B 4129
Patent
active
048620408
ABSTRACT:
In an inverter-type fluorescent lamp ballast, the inverter is powered from an ordinary electric utility power line by way of a rectifier means providing to the inverter a DC voltage having magnitude variations of about plus/minus 30% occurring at twice the frequency of the power line voltage. The inverter's output is a squarewave voltage of frequency averaging about 30 kHz and with amplitude modulations of about plus/minus 30%; which squarewave voltage is applied to a series-tuned L-C circuit. The fluorescent lamp is connected in parallel with the tank capacitor of this L-C circuit, thereby being provided with a current of magnitude proportional to the magnitude of the squarewave voltage. Within a significant range, the magnitude of the lamp current is a sensitive function of the frequency of the squarewave voltage; which frequency is modulated in such a way as to compensate for the variations in lamp current that would otherwise result from the amplitude modulation on the squarewave voltage. As an overall result, the crest factor of the lamp current is kept at a relatively low level in spite of the relatively large variations in the magnitude of the DC voltage.
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patent: 4184128 (1980-01-01), Nilssen
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patent: 4682101 (1987-07-01), Cattaneo
patent: 4727470 (1988-02-01), Nilssen
Application, "Controlled-Frequency Series-Resonant Ballast", Nilssen, 07/060,027, filed 6/9/87.
Groody James J.
Powell Mark R.
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