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Class Information
Number: 315/222
Name: Electric lamp and discharge devices: systems > Periodic switch in the supply circuit > Periodic switch in the primary circuit of the supply transformer > Plural interrupted transformer coil circuits
Description: Systems wherein the circuits which are connected to two or more of the transformer coils are periodically interrupted.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| RE38547 |
Frequency-modulated converter with a series-parallel resonance |
Jul. 6, 2004 |
| 6472827 |
Parallel-resonant inverter-type fluorescent lamp ballast |
Oct. 29, 2002 |
| 5627434 |
Apparatus for operating a fluorescent lamp of an image forming apparatus |
May. 6, 1997 |
| 5561349 |
Frequency-modulated converter with a series-parallel resonance |
Oct. 1, 1996 |
| 4920299 |
Push-pull fluorescent dimming circuit |
Apr. 24, 1990 |
| 4689524 |
Fluorescent lamp ballast |
Aug. 25, 1987 |
| 4684850 |
Variable frequency bridge inverter for driving gas discharge lamps |
Aug. 4, 1987 |
| 4532456 |
Output circuit for an electronic ballast system |
Jul. 30, 1985 |
| 4525649 |
Drive scheme for a plurality of flourescent lamps |
Jun. 25, 1985 |
| 4524305 |
Solid state regulated power supply system for cold cathode luminescent tube |
Jun. 18, 1985 |
| 4424468 |
Inverter ballast circuit with shoot through prevention, auto transformer coupling and overload prevention |
Jan. 3, 1984 |
| 4414491 |
Current limiting power supply for electron discharge lamps |
Nov. 8, 1983 |
| 4395659 |
Power supply device |
Jul. 26, 1983 |
| 4161674 |
Overvoltage protected fluorescent tube supply circuit |
Jul. 17, 1979 |
| 4061899 |
Arrangement for stabilization and ignition of welding arcs by ignition pulses |
Dec. 6, 1977 |
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