THE LIGHTING CIRCUIT OF MODULE LED

摘要

PURPOSE: A lighting circuit of an LED module is provided to maintain lifespan semi-permanently while saving power consumption by removing an electrolytic condenser having a certain lifespan. CONSTITUTION: In a lighting circuit of an LED module, a saw wave generating circuit(80) outputs a sawtooth wave having a certain period in supply power. A comparison voltage generator(61) divides the power of a rectifier circuit through resistor and output a comparison voltage. A second reference voltage generating unit(62) comprises a first constant current circuit(31) and a Zener diode(51). The output terminal of the comparison voltage generator is connected to one side of a modulator(22) and the first comparator(21). The each output terminal of modulator and the first comparator is connected to an AND circuit through combination of two input waveforms.