LED LEMINESCENCE APPARATUS

摘要

PURPOSE: A light emitting diode (LED) light emitting device is provided to reduce deviation of LED luminous efficiency by successively driving an LED. CONSTITUTION: An LED light emitting device includes an AC power supply (10), a rectification unit (20), a light emitting device unit (30), a switch unit (40), a first resistor unit (50) and a first switch control unit (100). The rectification unit (20) rectifies AC voltage and generates rectified voltage. The LED is serially connected to an output end of the rectification unit. The switch connects a drain terminal to a cathode of the each LED. A first switch control unit (100) senses current through a resistor connected to a source terminal of the switch, compares the sensed current and configured reference current and outputs corresponding voltage to a gate terminal of the switch.