| 摘要 |
The present invention relates to a light emitting diode driving circuit and a light emitting diode lighting device. The LED driving circuit includes: a detecting circuit that detects whether an input of the driving circuit is a low frequency current or a high frequency current;a first stage converter that converts the input of the driving circuit so as to provide a DC power suitable for the LED; a first feedback loop that is activated when the input of the driving circuit is detected to be the low frequency current, to convert a current from a LED load to a feedback voltage and feed it back to the first stage converter, wherein in the first feedback loop, when the current of the LED load is larger than a target value, the feedback voltage decreases, and when the current of the LED load is smaller than the target value, the feedback voltage increases; and a second feedback loop that is activated when the input of the driving circuit is detected to be the high frequency current, to convert the current from the LED load to the feedback voltage and feed it back to the first stage converter, wherein in the second feedback loop, when the current of the LED load is larger than the target value, the feedback voltage increases, and when the current of the LED load is smaller than the target value, the feedback voltage decreases. |
