(19)
(11) EP 3 007 521 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.06.2016 Bulletin 2016/22

(43) Date of publication A2:
13.04.2016 Bulletin 2016/15

(21) Application number: 15174194.9

(22) Date of filing: 29.06.2015
(51) International Patent Classification (IPC): 
H05B 37/02(2006.01)
 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
Designated Validation States:
MA

(30) Priority: 08.10.2014 US 201414509711

(71) Applicant: O2Micro, Inc.
Santa Clara, CA 95054 (US)

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

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

   


(54) DRIVING CIRCUIT WITH DIMMING CONTROLLER FOR DRIVING LIGHT SOURCES


(57) A driving circuit includes a power converter, a dimming controller and a current path coupled to the dimming controller. The power converter receives input power from a rectifier and provides output power to a light source. A power switch transfers power from an AC power source to the rectifier when the power switch is on. The dimming controller receives a switch monitoring signal indicative of the state of the power switch. An average current flowing through the light source has a first value if the power switch is on. The dimming controller is operable for adjusting the average current based on the switch monitoring signal. A current flows from the AC power source through the current path to ground when the power switch is off.







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