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Class Information
Number: 315/220
Name: Electric lamp and discharge devices: systems > Periodic switch in the supply circuit > Periodic switch in the primary circuit of the supply transformer > Plural transformers in the supply circuit
Description: Systems having two or more transformers connected in the supply circuit of the load device.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7560872 |
DC-AC converter having phase-modulated, double-ended, half-bridge topology for powering high voltage load such as cold cathode fluorescent lamp |
Jul. 14, 2009 |
| 7439686 |
Discharge-lamp lighting apparatus |
Oct. 21, 2008 |
| 7394213 |
Multi-lamp driver |
Jul. 1, 2008 |
| 7388334 |
High frequency electronic ballast with sine wave oscillator |
Jun. 17, 2008 |
| 7372211 |
Cold cathode tube lighting device and driving method and integrated circuit to be used in same |
May. 13, 2008 |
| 7294972 |
Feedback circuit for push-pull inverters |
Nov. 13, 2007 |
| 7279849 |
Apparatus for driving backlight of liquid crystal display |
Oct. 9, 2007 |
| 7279851 |
Systems and methods for fault protection in a balancing transformer |
Oct. 9, 2007 |
| 7250726 |
Systems and methods for a transformer configuration with a tree topology for current balancing in gas discharge lamps |
Jul. 31, 2007 |
| 7230390 |
Cold cathode fluorescent lamp assembly |
Jun. 12, 2007 |
| 7173379 |
Incremental distributed driver |
Feb. 6, 2007 |
| 7166969 |
Drive circuit for illumination unit |
Jan. 23, 2007 |
| 7126289 |
Protection for external electrode fluorescent lamp system |
Oct. 24, 2006 |
| 7081717 |
Discharge lamp lighting apparatus for lighting multiple discharge lamps |
Jul. 25, 2006 |
| 6870326 |
Fluorescent ballast with isolated system interface |
Mar. 22, 2005 |
| 6661181 |
Backlight assembly and liquid crystal display device having the same |
Dec. 9, 2003 |
| 6617807 |
Discharge lamp lighting circuit for a plurality of discharge lamps |
Sep. 9, 2003 |
| 6515427 |
Inverter for multi-tube type backlight |
Feb. 4, 2003 |
| 5861718 |
ARC lamp igniter apparatus and method |
Jan. 19, 1999 |
| 5742132 |
Method and system for starting and operating a discharge lamp |
Apr. 21, 1998 |
| 5444334 |
System for starting a high intensity discharge lamp |
Aug. 22, 1995 |
| 5386181 |
Swept frequency switching excitation supply for gas discharge tubes |
Jan. 31, 1995 |
| 5332951 |
Circuit for driving gas discharge lamps having protection against diode operation of the lamps |
Jul. 26, 1994 |
| 5309350 |
Push-pull inverter |
May. 3, 1994 |
| 5117158 |
Electronic ballast for fluorescent lights |
May. 26, 1992 |
| 5099407 |
Inverter with power factor correction circuit |
Mar. 24, 1992 |
| 5084653 |
Power-line-isolated dimmable electronic ballast |
Jan. 28, 1992 |
| 5081399 |
Power supply systems for neon lights |
Jan. 14, 1992 |
| 5053681 |
Remote electrical converter |
Oct. 1, 1991 |
| 5045760 |
Neon sign transformer |
Sep. 3, 1991 |
| 5017839 |
Illumination system having a low-power high-pressure discharge lamp and power supply combination |
May. 21, 1991 |
| 4958109 |
Solid state ignitor |
Sep. 18, 1990 |
| 4956583 |
Control system for electrical lighting |
Sep. 11, 1990 |
| 4839565 |
High pressure double wall sodium arc tube and methods of operating such |
Jun. 13, 1989 |
| 4754201 |
Magnetic low load factor series ballast circuit |
Jun. 28, 1988 |
| 4749913 |
Operating circuit for a direct current discharge lamp |
Jun. 7, 1988 |
| 4704561 |
Push-pull generator |
Nov. 3, 1987 |
| 4686427 |
Fluorescent lamp dimming switch |
Aug. 11, 1987 |
| 4572990 |
Electronic transformer system for neon lamps |
Feb. 25, 1986 |
| 4563616 |
Non-saturating, self-driven switching inverter for gas discharge devices |
Jan. 7, 1986 |
| 4511195 |
Device for starting and operating gas discharge tubes |
Apr. 16, 1985 |
| 4488090 |
Advertising sign system |
Dec. 11, 1984 |
| RE31758 |
High efficiency push-pull inverters |
Dec. 4, 1984 |
| 4441054 |
Stabilized dimming circuit for lamp ballasts |
Apr. 3, 1984 |
| 4438369 |
Unitary light source comprising compact HID lamp and incandescent ballast filament |
Mar. 20, 1984 |
| 4437040 |
Method of effecting stabilized dimming of fluorescent lamps |
Mar. 13, 1984 |
| 4422015 |
Electric insect trap power supply |
Dec. 20, 1983 |
| 4396866 |
Lamp filament drive scheme providing for control of filament voltages by use of lamp current in solid state ballasts |
Aug. 2, 1983 |
| 4382212 |
One lamp out detect shutdown technique for high frequency, solid state fluorescent lamp ballasts |
May. 3, 1983 |
| 4353010 |
Transistor drive scheme for fluorscent lamp ballast |
Oct. 5, 1982 |
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