An automatic dimming led energy-saving traffic signal lamp

Abstract

An automatic dimming LED energy-saving traffic signal lamp, including input protection [1], rectification unit [2], AC direct drive controller [3], photosensitive sensor [4], dimming control unit [5], energy buffer unit [ 6], LED lighting unit [7]. The AC direct drive controller drives different groups of LEDs to emit light according to the instantaneous value of the rectified pulsating voltage. The dimming control unit performs voltage conversion according to the signal of the photosensitive sensor [4], generates a suitable voltage signal and supplies it to the AC direct drive controller, and the AC direct drive controller controls the brightness change of the LED light-emitting unit. The energy buffer unit is used to smooth the brightness of the LED and reduce the flicker of the LED. Its advantages are that it does not require a large-capacity filter capacitor, has few external components, has high power factor and efficiency, has an energy buffer unit, overcomes the flickering phenomenon of the AC direct drive LED, and has good dimming performance, which is conducive to energy saving.

Description

technical field [0001] The invention relates to a traffic signal lamp, in particular to an automatic dimming LED energy-saving traffic signal lamp, which belongs to the technical field of energy-saving road traffic lighting. Background technique [0002] LED (Light Emitting Diode) is a new type of light source, which has the advantages of low power consumption, high brightness, small size, light weight, and long life. Traffic lights using LEDs as light sources have the advantages of good visibility, energy saving, fast response, etc., and gradually replace incandescent lamps and low-voltage tungsten halogen lamps to make road traffic lights. [0003] The application of LED in traffic signal lights is developing very rapidly. Due to the advantages of environmental protection, energy saving, and long life of LED itself, there is still a lot of space for the application of LED in the field of transportation. However, the current application of high-power LEDs needs to solve th...

AI Technical Summary

Problems solved by technology

Currently, LED signal lamps that use AC mains usually require rectification and filtering, and filtering requires large-capacity capacitors, which are large in size and short in life, and the harmonic content of pulse current formed by rectification and filtering is large, which reduces the power factor and efficiency of lamps. , affecting the performance of LED signal lights

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