| 摘要 |
The present invention relates to a dimmable LED lighting device which comprises: a rectifier circuit for rectifying an alternating current voltage to a direct current rectified voltage; an LED light-emitting block configured of at least one LED; a load (n>=1 and is a natural number) connected in series to n LED light-emitting blocks; a switch block configured as a switch for bypassing the current flowing in each light-emitting block of the load; a current limiter for limiting the current supplied to the LED light-emitting blocks; and a controller for controlling the switch block and the current limiter, wherein the controller further includes the function of measuring the removed delta phase when an alternating voltage is partially phase cut by a phase controller and supplied, the controller uses the measured delta phase and adjusts the amount of current of the current limiter, and all LED light-emitting blocks are lit in each rectifying cycle even when dimming is 50% or more. |
