LED ILLUMINATION DEVICE INVOLVING RIPPLE FREE CIRCUIT

摘要

An objective of the present invention is to eliminate or reduce a flicker phenomenon through supplying power that removes ripples on a LED unit by including a circuit that eliminates or reduces ripples. For such, provided is an LED lighting device including a ripple removing circuit, which includes a power supply unit supplying the input power; a rectifier circuit unit which is supplied with the input power from the power supply unit to output rectified power supply; a ripple removing circuit unit which is supplied with the input power to store the electric charge and in the case input power is reduced, discharges the stored electric charge to output the power supply that is removed of ripples; an LED unit which has multiple LED channels connected in series and has a resistor unit connected to the last end of the LED channel; and a switch circuit unit that includes a current sensing resistor and multiple switches, wherein an n-th switch is connected to the rear end of an n-th LED channel to control the operation of the LED channel, and the n-th switch is controlled by the sum of the current of the n-th switch flowing on the current sensing resistor and the current of the n+1-th switch.