| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that a traditional power-supply circuit of light-emitting diode (LED) cannot fix at the best work status during operation.SOLUTION: The present invention relates to a power-supply circuit for driving at least one light-emitting diode (LED) 120. A power-supply circuit 100 includes an input unit 107, an active power-factor corrector 101, a converter 103, an output unit 109, and a feedback unit 105. The input unit is utilized to receive a power signal from a power source, and the output unit is utilized to receive power transferred from the converter for driving at least one LED. The feedback unit is coupled to a node between the converter and the output unit, and delivers the power signal, from the converter to the output unit, back to the active power-factor corrector. The active power-factor corrector monitors the power signal based on the power signal from the feedback unit for stabilizing the outputting power from the output unit and thereby driving the LED. |
