DIMMING-TYPE LED LIGHTING APPARATUS HAVING ELECTROLYTIC CAPACITOR-LESS POWER SUPPLY DEVICE

摘要

The present invention relates to a dimming-type LED lighting apparatus having an electrolytic capacitor-less power supply device which senses and controls input voltage information of a primary side of a transformer, senses an input current thereof, and operates with reference to input power thereof. Therefore, the apparatus does not require a secondary-side electrolytic capacitor for stabilizing the output voltage and current thereof, and thus can improve the entire lifetime thereof. The LED lighting apparatus, which has an electrolytic capacitor-less power supply device for supplying power to an LED lighting, comprises: a voltage input unit for inputting a commercialized AC voltage; a transformer having a primary side connected to the voltage input unit and a secondary side connected to the LED lighting so as to drive the LED lighting; a power transistor connected between the primary side of the transformer and a ground terminal; a noise filter configured between the transformer and the LED lighting to remove noise included in power input to the LED lighting; a reference voltage generation unit for generating and outputting a commercialized AC voltage input through the voltage input unit, as a reference voltage; and a switching control unit for receiving, as an input, the reference voltage generated by the reference voltage generation unit and driving the power transistor.