The invention relates to a light-emitting
diode (LED) street lamp energy-saving
automatic control method and device. The device comprises a power supply, an
automatic control circuit and an LED
light source, wherein the power supply is a flyback power supply containing an AC protection circuit, a common-mode rejection circuit, a
rectifier filtering circuit and a
constant pressure constant currentcircuit which are connected successively; the
automatic control circuit comprises a
clock circuit, a SCM circuit and a switch circuit which are connected successively; and the LED
light source comprises an LED
light source 1 and an LED light source 2 which are arranged in a
chip in parallel, the
cathode is directly connected with the negative
electrode of the power supply, the
anode is connected with the automatic
control circuit; and the automatic
control circuit periodically and automatically connects the positive
electrode of the power supply with the anodes of the LED light source 1 and the LED light source 2 according to the illumination brightness demands of streets to ensure that the two LED light sources work at the same time, or periodically, automatically and separately connectsthe positive
electrode of the power supply with the
anode of the LED light source 1 or the LED light source 2 to ensure that the LED light source 1 or the LED light source 2 works. The invention solves the problems of saving the energy and prolonging the service life of the LED street lamp, and has the obvious advantages of simple structure, good illumination quality for streets and no illumination dark space.