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Class Information
Number: 315/226
Name: Electric lamp and discharge devices: systems > Periodic switch in the supply circuit > Plural periodic switches or multiple contact periodic switch
Description: Systems wherein (1) the periodic switch is provided with two or more pairs of circuit interrupting contacts, or (2) two or more periodic switches are provided in the circuit, the circuit being intermittently interrupted at two or more different places.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7589475 |
Electric lamp with enhanced dependability |
Sep. 15, 2009 |
| 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 |
| 7529107 |
Power supply and electronic ballast with voltage clamping circuit |
May. 5, 2009 |
| 7443107 |
Method and apparatus for controlling a discharge lamp in a backlighted display |
Oct. 28, 2008 |
| 7432665 |
Method and device for driving a metal halide lamp |
Oct. 7, 2008 |
| 7432660 |
IC-based low cost reliable electronic ballast with multiple striking attempts and end of lamp life protection |
Oct. 7, 2008 |
| 7397197 |
Discharge lamp lighting circuit |
Jul. 8, 2008 |
| 7391163 |
Apparatus of driving light source for display device |
Jun. 24, 2008 |
| 7365497 |
Discharge lamp ignition device and projector |
Apr. 29, 2008 |
| 7336040 |
Single-channel comprehensive protection circuit |
Feb. 26, 2008 |
| 7336039 |
Driving device for discharge lamps |
Feb. 26, 2008 |
| 7323825 |
Ballast integrated circuit (IC) |
Jan. 29, 2008 |
| 7312584 |
Plasma-generation power-supply device |
Dec. 25, 2007 |
| 7307386 |
Process for operating a discharge lamp |
Dec. 11, 2007 |
| 7288898 |
Automotive high intensity discharge lamp ballast circuit |
Oct. 30, 2007 |
| 7276864 |
Discharge lamp lighting device and projection type image display apparatus having the same |
Oct. 2, 2007 |
| 7208882 |
Lighting device for discharge lamp |
Apr. 24, 2007 |
| 7208883 |
Current detection circuit, and power supply apparatus, power supply system and electronic apparatus using the current detection circuit |
Apr. 24, 2007 |
| 7183722 |
Apparatus and method of driving lamp of liquid crystal display device |
Feb. 27, 2007 |
| 7176635 |
Apparatus and method for compensating for reduced light output of a light source having a lumen depreciation characteristic over its operational life |
Feb. 13, 2007 |
| 7173380 |
Push-pull driver with null-short feature |
Feb. 6, 2007 |
| 7173379 |
Incremental distributed driver |
Feb. 6, 2007 |
| 7170235 |
Circuit arrangement with a separate resonant igniter for a high-pressure discharge lamp |
Jan. 30, 2007 |
| 7141937 |
High-pressure discharge lamp operation device and illumination appliance having the same |
Nov. 28, 2006 |
| 7112929 |
Full-bridge and half-bridge compatible driver timing schedule for direct drive backlight system |
Sep. 26, 2006 |
| 7112930 |
Device and method for detecting high voltage |
Sep. 26, 2006 |
| 7109667 |
Discharge lamp driving apparatus |
Sep. 19, 2006 |
| 7098604 |
Solar powered lamp having an auxiliary startup device |
Aug. 29, 2006 |
| 7061188 |
Instant start electronic ballast with universal AC input voltage |
Jun. 13, 2006 |
| 7061190 |
Circuit arrangement and operating device for operating lamps |
Jun. 13, 2006 |
| 7045964 |
Emergency lighting system with automatic diagnostic test |
May. 16, 2006 |
| 7042204 |
Voltage source and current source with capacitor |
May. 9, 2006 |
| 7023289 |
Programmable oscillator |
Apr. 4, 2006 |
| 7019465 |
Discharge lamp illumination circuit and discharge lamp illumination method |
Mar. 28, 2006 |
| 7009346 |
Driving an EL panel without DC bias |
Mar. 7, 2006 |
| 7005808 |
Discharge lamp illumination circuit |
Feb. 28, 2006 |
| 6995481 |
Energy saving electrical power control device and method |
Feb. 7, 2006 |
| 6911790 |
Multiplexed high voltage DC-AC driver |
Jun. 28, 2005 |
| 6894575 |
High-voltage oscillator having a fast response time |
May. 17, 2005 |
| 6819089 |
Power factor correction circuit with high-voltage semiconductor component |
Nov. 16, 2004 |
| 6762561 |
Radio frequency resonator |
Jul. 13, 2004 |
| 6717565 |
Illuminating apparatus for a liquid crystal monitor and a digital camera having a liquid crystal monitor utilizing an illuminating apparatus thereof |
Apr. 6, 2004 |
| 6683420 |
Switching device for operating a high-pressure discharge lamp |
Jan. 27, 2004 |
| 6657404 |
Method and apparatus for power control |
Dec. 2, 2003 |
| 6583571 |
Emergency illuminator |
Jun. 24, 2003 |
| 6573664 |
High efficiency high power factor electronic ballast |
Jun. 3, 2003 |
| 6525488 |
Self-oscillating synchronous boost converter |
Feb. 25, 2003 |
| 6501228 |
Full-wave driving circuit for multiple electroluminescent cells |
Dec. 31, 2002 |
| 6476568 |
Gas discharge lamp lighting device |
Nov. 5, 2002 |
| 6469455 |
Lighting emitting element driving circuit |
Oct. 22, 2002 |
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