Electric lamp and discharge devices: systems – Current and/or voltage regulation – Plural load device regulation
Reexamination Certificate
2009-03-30
2011-12-13
Tan, Vibol (Department: 2819)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Plural load device regulation
C315S291000, C315S18500S
Reexamination Certificate
active
08076868
ABSTRACT:
The present invention relates to an LED driver, power control circuit and display panel using the same. The LED driver has the function of spread spectrum frequency modulation (SSFM). The circuit topology of the driver includes a power converter, an error amplifier, a feedback circuit, a saw-tooth generator and a driving circuit. The present invention adds the SSFM circuit in the saw-tooth generator to generate a time variant current according to time variant function, so that the saw-tooth wave could be changed by the time variant current as mentioned above. Therefore, the frequency of the driving pulse generated by the LED driver will be varied as time. As the result, the reduction of the electro-magnetic interference (EMI) can be achieved.
REFERENCES:
patent: 4418406 (1983-11-01), Ogawa
patent: 7235954 (2007-06-01), Murakami
patent: 7564434 (2009-07-01), Kim
patent: 7740371 (2010-06-01), Lebens et al.
patent: 7961158 (2011-06-01), Chou et al.
patent: 2009/0128045 (2009-05-01), Szczeszynski et al.
Muncy Geissler Olds & Lowe, PLLC
Orise Technology Co., Ltd.
Tan Vibol
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