Electronic ballast having pulsating output voltage

Electric lamp and discharge devices: systems – Condenser in the supply circuit – Inductance in the condenser circuit

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

315127, 315225, 315DIG7, H05B 3700

Patent

active

055504396

ABSTRACT:
In a fluorescent lamp ballast, a source of high-frequency voltage is applied directly across a series-resonant L-C circuit. The fluorescent lamp is connected in parallel with the capacitor of the L-C circuit and a voltage-limiting means is operative to prevent the series-resonant L-C circuit from overloading the voltage source during any period when the lamp is not effective in providing circuit loading. When power is initially applied to the series-resonant L-C circuit, a control means provides a short circuit across the capacitor; and, by way of a first current transformer, the resulting short circuit current is used for pre-heating the fluorescent lamp cathodes. After about 1.5 second, the control means provides for removal of the short circuit for a period of about 25 milli-seconds, thereby permitting the voltage across the capacitor to grow to a magnitude sufficient to ignite and operate the lamp. If the lamp ignites, the resulting lamp current is then used, by way of a second current transformer, to prevent the control means from re-providing the short circuit. If lamp current does not flow, or if it at any time ceases to flow, the control means will re-provide the short circuit within about 25 milli-seconds. Thereafter, until power is removed or until an operable lamp is connected, the control means will continuously repeat the cycle of 1.5 second short circuit and 25 milli-seconds open circuit.

REFERENCES:
patent: 3662216 (1972-05-01), Hildebrant
patent: 4370600 (1983-01-01), Zansky
patent: 4612478 (1986-09-01), Payne
patent: 4647820 (1987-03-01), Chormin
patent: 5111114 (1992-05-01), Wang
patent: 5142202 (1992-08-01), Sun et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Electronic ballast having pulsating output voltage does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic ballast having pulsating output voltage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic ballast having pulsating output voltage will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1058171

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.