Patent ID: 9301351
Filing Date: 2016-03-29
CPC Classification: H05B

Claim Text:
1. A driving circuit for light-emitting diode, comprising: an inductor, used for producing an output current; a power switch, coupled to said inductor, and used for controlling said inductor to transmit said output current to a plurality of light-emitting diodes and drive said plurality of light-emitting diodes; an adjusting circuit, receiving a pulse width modulation signal related to said output current, and producing an adjusting impedance value according to said pulse width modulation signal; and a driving unit, generating a switching signal according to said adjusting impedance value, switching said power switch and enabling said inductor to produce said output current, and adjusting the frequency of said switching signal according to said adjusting impedance value; where the frequency of said switching signal becomes higher as said output current becomes smaller.