Patent ID: 8487538
Filing Date: 2013-07-16
Classification: H05B

Abstract:
1. A driving power control circuit for light emitting diodes (LED) adapted to drive power supplies of a plurality of LED strings, the driving power control circuit comprising: a first power supply terminal, providing a first output voltage; a second power supply terminal, providing a second output voltage; a plurality of switch units, and each of the switch units electrically coupled between one of the LED strings and the second power supply terminal, each of the LED strings is electrically coupled between one of the switch units and the first power supply terminal to make the first power supply terminal, any of the plurality of LEDs, the corresponding one of the plurality of switch units and the second power supply terminal in parallel to form an electronic conducting path; and a control unit, outputting a plurality of adjusting signals to determine whether the switch units are turned on, getting a plurality of node voltages between the plurality of switch units and the plurality of corresponding LED strings, and the control unit comprising: