(19)
(11) EP 2 498 579 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.11.2013 Bulletin 2013/46

(43) Date of publication A2:
12.09.2012 Bulletin 2012/37

(21) Application number: 12156751.5

(22) Date of filing: 23.02.2012
(51) International Patent Classification (IPC): 
H05B 33/08(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 07.03.2011 US 201113042349

(71) Applicant: O2 Micro, Inc.
Santa Clara, CA 95054 (US)

(72) Inventors:
  • Lin, Yung Lin
    Palo Alto, CA California 94303 (US)
  • Kuo, Ching-Chuan
    105 Taipei City (TW)

(74) Representative: Lippert, Stachow & Partner 
Patentanwälte Postfach 30 02 08
51412 Bergisch Gladbach
51412 Bergisch Gladbach (DE)

   


(54) Controllers, systems and methods for controlling dimming of light sources


(57) A controller for controlling dimming of an LED light source includes a control terminal and dimming control circuitry coupled to the control terminal. The control terminal provides a driving signal to control a control switch coupled to the LED light source, thereby controlling the dimming of the LED light source. The dimming control circuitry generates the driving signal according to a set of operations of a power switch that transfers an AC signal. The dimming control circuitry further adjusts the driving signal by counting multiple waves of the AC signal to control the dimming of the LED light source.







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