Power source apparatus

Details Power source apparatus Power source apparatus

2005-07-05

2009-11-17

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S312000

Reexamination Certificate

active

07619368

ABSTRACT:
A power source apparatus is disclosed in this invention, specifically a power source apparatus comprising a voltage amplitude control unit that employs an active power factor corrector to control the output DC voltage by applying positive or negative logic control voltage, incorporated with high frequency power source circuit and high frequency transformer, brightness of Cold Cathode Fluorescent Lamp (CCFL) or External Electrode Fluorescent Lamp (EEFL) are controllable and DC power is directly applied to DC load. Such method is accomplished by adjusting the amplitude of the supplying DC voltage for controlling the amplitude of the high frequency voltage of CCFL or EEFL, thus called Voltage Amplitude Method. Because of the characteristics of stable frequency, high resolution and linearity, VAM is broadly used in the control of luminance of discharge tubes, such as TFT-LCD TVs, LCD monitors and advertisement lamps. The impulse width controller of the present invention achieves the luminance control of CCFL or EEFL inside or outside the glow discharge zone.

REFERENCES:
patent: 5666279 (1997-09-01), Takehara et al.
patent: 5818709 (1998-10-01), Takehara
patent: 7332871 (2008-02-01), Lu

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