LED LIGHTING DEVICE BY CONSTANT CURRENT

摘要

PURPOSE: An LED lighting device in which a constant current is driven is provided to uniformly maintain brightness of light in an LED block by using a constant current regardless of a height of an AC input voltage. CONSTITUTION: An LED block(70) is composed of one or more LEDs. The LED block is serially connected to a first threshold voltage block(11) or a third threshold voltage block(13). A switch block is composed of a first switch(S11), a second switch(S12), and a third switch(S13). A controller(3) detects a rectifying voltage. The controller generates switch control signals(SC10-SC13) suitable for the detected rectifying voltage and controls the switch block.