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Class Information
Number: 315/221
Name: Electric lamp and discharge devices: systems > Periodic switch in the supply circuit > Periodic switch in the primary circuit of the supply transformer > Secondary conductively connected to the primary
Description: Systems having the primary circuit of the transformer connected to the secondary circuit by current conductive means.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7432664 |
Circuit for powering a high intensity discharge lamp |
Oct. 7, 2008 |
| 7173379 |
Incremental distributed driver |
Feb. 6, 2007 |
| 6806657 |
Device for operating discharge lamps |
Oct. 19, 2004 |
| 6414448 |
Electronic ballast for a gas discharge lamp |
Jul. 2, 2002 |
| 5909086 |
Plasma generator for generating unipolar plasma |
Jun. 1, 1999 |
| 5332951 |
Circuit for driving gas discharge lamps having protection against diode operation of the lamps |
Jul. 26, 1994 |
| 5055747 |
Self-regulating, no load protected electronic ballast system |
Oct. 8, 1991 |
| 4935673 |
Variable impedance electronic ballast for a gas discharge device |
Jun. 19, 1990 |
| 4743810 |
Circuit arrangement for operating a high-pressure discharge lamp |
May. 10, 1988 |
| 4733135 |
Self-regulating, no load protected electronic ballast system |
Mar. 22, 1988 |
| 4678968 |
High intensity discharge lamp starting and operating apparatus |
Jul. 7, 1987 |
| 4609850 |
Current driven gain controlled electronic ballast system |
Sep. 2, 1986 |
| 4595861 |
Power supplies for electroluminescent panels |
Jun. 17, 1986 |
| 4538094 |
Lamp ballast with near unity power factor and low harmonic content |
Aug. 27, 1985 |
| 4532456 |
Output circuit for an electronic ballast system |
Jul. 30, 1985 |
| 4524305 |
Solid state regulated power supply system for cold cathode luminescent tube |
Jun. 18, 1985 |
| 4503361 |
Electronic ballast system |
Mar. 5, 1985 |
| 4503362 |
Frequency stabilized, gain controlled ballast system |
Mar. 5, 1985 |
| 4495447 |
DC-DC Converter circuit |
Jan. 22, 1985 |
| 4484108 |
High frequency ballast-ignition system for discharge lamps |
Nov. 20, 1984 |
| 4459653 |
Apertured transformer and inverter using same |
Jul. 10, 1984 |
| 4288724 |
Impulse generator for use with phosphor energizable lamps |
Sep. 8, 1981 |
| 4286194 |
Generator for use with loads having changing impedance characteristics |
Aug. 25, 1981 |
| 4145636 |
Fluorescent lamp driving circuit |
Mar. 20, 1979 |
| 4071807 |
Fluorescent lamp lighting device |
Jan. 31, 1978 |
| 4051410 |
Discharge lamp operating circuit |
Sep. 27, 1977 |
| 4017785 |
Power source for fluorescent lamps and the like |
Apr. 12, 1977 |
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