Method and apparatus for controlling a discharge lamp in a backlighted display

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 7911150
APP PUB NO 20090206763A1
SERIAL NO

12428373

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The described DC to AC inverter efficiently controls the amount of electrical power used to drive a cold cathode fluorescent lamp (CCFL). The output is a fairly pure sine wave which is proportional to an input control voltage. The output waveform purity is ensured by driving a symmetrical rectangular waveform into a second-order, low pass filter at the resonant frequency of the filter for all conditions of line voltage and delivered power. Operating stress on the step-up transformer is minimized by placing the load (lamp) directly across the secondary side of the transformer. When configured to regulate delivered power, the secondary side may be fully floated which practically eliminates a thermometer effect on the operation of the lamp. All of the active elements, including the power switches, may be integrated into a monolithic silicon circuit.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MONOLITHIC POWER SYSTEMS, INC.SAN JOSE, CA226

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hsing, Michael Ren Saratoga, US 7 326
Moyer, James Copland San Jose, US 17 351
Shannon, John Robert Daly City, US 6 298

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MAXIM INTEGRATED PRODUCTS, INC. (1)
6469454 Cold cathode fluorescent lamp controller 19 2000
 
Power Integrations, Inc. (1)
6313976 Method and apparatus providing a multi-function terminal for a power supply controller 33 2000
 
FAIRCHILD SEMICONDUCTOR CORPORATION (2)
5818669 Zener diode power dissipation limiting circuit 22 1996
5965989 Transformer primary side lamp current sense circuit 15 1996
 
O.sub.2 Micro, Inc. (1)
5619402 Higher-efficiency cold-cathode fluorescent lamp power supply 142 1996
 
LINEAR TECHNOLOGY CORPORATION (1)
6198236 Methods and apparatus for controlling the intensity of a fluorescent lamp 62 1999
 
PHILIPS ELECTRONICS NORTH AMERICA CORPORATION;INTELLECTUAL PROPERTY & STANDARDS (2)
5742134 Inverter driving scheme 22 1996
6008590 Integrated circuit inverter control having a multi-function pin 28 1996
* Cited By Examiner

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