LED DRIVE CIRCUIT AND LED ILLUMINATION APPARATUS USING THE SAME

摘要

An LED drive circuit which is connectable to a phase control type light adjuster, including: a first reference voltage generation portion that generates a first reference voltage; a second reference voltage generation portion that generates a second reference voltage according to a phase angle of the light adjuster; an input voltage detection portion that detects a size relationship between an input voltage and a threshold value voltage; a current draw-out portion that draws out a current in accordance with the first reference voltage or the second reference voltage from an electricity supply line that supplies electricity to an LED drive portion; and a switch portion that in accordance with a detection result by the input voltage detection portion, performs switching between an output from the first reference voltage generation portion to the current draw-out portion and an output from the second reference voltage generation portion to the current draw-out portion.