An object of the present invention is to provide a LED power supply, the capacity of the large capacitor is required to remove a ripple from the output stage to improve the performance of the power supply from the LED power supply. To this end, the present invention is installed on the output end of the power supply for outputting a DC voltage a voltage sensor detecting a voltage; OP amp for comparing a voltage divided from the voltage and the filter unit detected by the voltage sensor, and a direct current flowing to the output terminal of the power supply control to a variable in accordance with the comparison result; And a filter unit for the partial pressure of the ripple component contained in the DC voltage output from the output terminal of the power supply input to the OP amplifier. Therefore, both the present invention to the output of the LED and a large capacity from the power supply capacitor can remove a ripple from the required output to improve the performance of the power supply, a large capacitance is required primary or secondary power supply in which the device there is an advantage that can be applied.