Patent ID: 9119238
Filing Date: 2015-08-25
Classification: H05B

Abstract:
1. A method for driving a light emitting diode connected to a power switch, the method comprising: determining a duty cycle of a pulse sequence for controlling the power switch according to a present current and a predetermined operating current of the light emitting diode; generating the pulse sequence according to the duty cycle and according to at least one of a randomized period sequence and a randomized pulse position sequence; and controlling switching operation of the power switch by the pulse sequence, so as to drive the light emitting diode, wherein, the step of determining the duty cycle of the pulse sequence for controlling the power switch according to the present current and the predetermined operating current of the light emitting diode comprises: sampling the present current of the light emitting diode; comparing the sampled present current and the predetermined operating current; and calculating the duty cycle of the pulse sequence for controlling the power switch according to a comparison result.