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Class Information
Number: 315/279
Name: Electric lamp and discharge devices: systems > Pulsating or a.c. supply > Transformer in the supply circuit > Current regulator in the primary circuit
Description: Systems provided with means in the primary circuit of the transformer for regulating the current or voltage supplied to the load device.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7564192 |
HID dimming method and apparatus |
Jul. 21, 2009 |
| 7550928 |
Driving circuit for multiple cold cathode fluorescent lamps backlight applications |
Jun. 23, 2009 |
| 7531967 |
Flashlamp drive circuit |
May. 12, 2009 |
| 7528552 |
Power transformer combined with balance windings and application circuits thereof |
May. 5, 2009 |
| 7459865 |
Cold cathode tube lighting device, tube current detecting circuit used in cold cathode tube lighting device, tube current controlling method and integrated circuit |
Dec. 2, 2008 |
| 7402957 |
Inverter circuit, backlight assembly, and liquid crystal display with backlight assembly |
Jul. 22, 2008 |
| 7378802 |
Discharge lamp lighting circuit |
May. 27, 2008 |
| 7372213 |
Lamp current balancing topologies |
May. 13, 2008 |
| 7352136 |
DC-DC converter with reduced surge voltage and an electronic ballast including the converter for a discharge lamp |
Apr. 1, 2008 |
| 7312587 |
Control device for high intensity discharge bulb and method of controlling high intensity discharge bulb |
Dec. 25, 2007 |
| 7307388 |
Backlight modules and lamp modules in flat panel displays |
Dec. 11, 2007 |
| 7279851 |
Systems and methods for fault protection in a balancing transformer |
Oct. 9, 2007 |
| 7279852 |
Apparatus and method for striking a fluorescent lamp |
Oct. 9, 2007 |
| 7265499 |
Current-mode direct-drive inverter |
Sep. 4, 2007 |
| 7250731 |
Primary side current balancing scheme for multiple CCF lamp operation |
Jul. 31, 2007 |
| 7242155 |
Discharge lamp driving circuit |
Jul. 10, 2007 |
| 7235932 |
High efficiency ballast for gas discharge lamps |
Jun. 26, 2007 |
| 7233113 |
Power supply system for liquid crystal monitors |
Jun. 19, 2007 |
| 7221103 |
Circuit for operating high-pressure discharge lamps |
May. 22, 2007 |
| 7218063 |
Two light level ballast |
May. 15, 2007 |
| 7218065 |
Discharge lamp lighting circuit |
May. 15, 2007 |
| 7215087 |
Discharge lamp lighting apparatus for lighting multiple discharge lamps |
May. 8, 2007 |
| 7193372 |
Electronic ballast with voltage converter having improved damping arrangement |
Mar. 20, 2007 |
| 7187139 |
Split phase inverters for CCFL backlight system |
Mar. 6, 2007 |
| 7183724 |
Inverter with two switching stages for driving lamp |
Feb. 27, 2007 |
| 7173382 |
Nested balancing topology for balancing current among multiple lamps |
Feb. 6, 2007 |
| 7154233 |
Converter circuit with coupled inductances having asymmetrical air gap arrangement |
Dec. 26, 2006 |
| 7002304 |
Multi-lamp drive device |
Feb. 21, 2006 |
| 6936974 |
Half-bridge inverter for asymmetrical loads |
Aug. 30, 2005 |
| 6933684 |
Electronic ballast using cut and save technology |
Aug. 23, 2005 |
| 6922022 |
LED switching arrangement for enhancing electromagnetic interference |
Jul. 26, 2005 |
| 6861812 |
Discharge lamp ballast with DC-DC converter |
Mar. 1, 2005 |
| 6812652 |
Constant current regulator for airport lighting |
Nov. 2, 2004 |
| 6781324 |
Ballast for at least one electric incandescent lamp |
Aug. 24, 2004 |
| 6747421 |
Self oscillation circuits |
Jun. 8, 2004 |
| 6731075 |
Method and apparatus for lighting a discharge lamp |
May. 4, 2004 |
| 6570345 |
Constant current regulator for airport lighting |
May. 27, 2003 |
| 6565230 |
Recessed light fixture converted to lower voltage halogen fixture |
May. 20, 2003 |
| 6472827 |
Parallel-resonant inverter-type fluorescent lamp ballast |
Oct. 29, 2002 |
| 6242869 |
Fluorescent lamp stabilizer harmonics reduction method |
Jun. 5, 2001 |
| 6181075 |
Power supply circuit for gas discharge tube |
Jan. 30, 2001 |
| 6100651 |
Fluorescent lamp stabilizer harmonics reduction method |
Aug. 8, 2000 |
| 6094013 |
Circuit arrangement for limiting the current at make for a transformer |
Jul. 25, 2000 |
| 5965989 |
Transformer primary side lamp current sense circuit |
Oct. 12, 1999 |
| 5854543 |
Inverter circuit for lighting a cold cathode tube by the use of a piezoelectric transformer |
Dec. 29, 1998 |
| 5751566 |
Current stabilizer with step-up transformer |
May. 12, 1998 |
| 5670848 |
Light monitoring system |
Sep. 23, 1997 |
| 5352956 |
Power supply for gas discharge tube |
Oct. 4, 1994 |
| 5289110 |
Input current responsive, tap changing transformer system |
Feb. 22, 1994 |
| 5130611 |
Universal electronic ballast system |
Jul. 14, 1992 |
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