RIPPLE ELIMINATION DEVICE

摘要

PURPOSE: A ripple elimination apparatus of a power circuit for an LED lamp is provided to efficiently eliminate only ripple component by connecting a transistor to an output terminal of a direct current voltage output part and eliminating the ripple component with a linear method. CONSTITUTION: A direct current voltage output part(3) changes an alternating current power source outputted in a transformer(2) into direct current voltage and supplies to an LED lamp(5). The LED lamp is composed of a plurality of LEDs turned on by using the direct current voltage provided in the direct current voltage output part. A condenser(C3) passes through a ripple component outputted in the direct current voltage output part. A transistor(Q2) offsets an output current outputted to a collector terminal as a ripple current. A Zener diode(ZD1) prevents exaggerated reverse voltage to be generated between an emitter and a base of the transistor.