Patent ID: 9185763
Filing Date: 2015-11-10
Classification: H05B,Y02B

Abstract:
1. A light emitting diode (LED) string driving method applicable to drive a driving circuit, the driving circuit comprising a plurality of LED strings, a power supply unit electrically coupled to the LED strings, a comparison unit configured to receive an input voltage, a control unit electrically coupled to the comparison unit and a switch unit electrically coupled to the control unit, the power supply unit and the LED strings, the driving method comprising: configuring the comparison unit to output a first control signal to the control unit through comparing the input voltage to a predetermined voltage; configuring the control unit to output a second control signal to the switch unit according to the first control signal; and configuring the switch unit to form various electrical loops and configuring the LED strings to corporately form either a parallel loop or a series loop via the switch unit with respective electrical loops.