LED streetlamp illumination light adjusting system based on DC remote power supply

Abstract

The invention discloses an LED streetlamp illumination light adjusting system based on a DC remote power supply. The LED streetlamp illumination light adjusting system comprises a DC remote power supply (central office terminal) device and a plurality of LED streetlamp control devices, wherein the DC remote power supply device performs AC / DC conversion on the AC mains supply to generate a constant-voltage and constant-current high voltage direct current suspended to ground, and transmits the high voltage direct current to the LED streetlamp control devices by means of power cables; each LED streetlamp control device is connected with the corresponding LED streetlamp; and each LED streetlamp control device provides a constant-voltage and constant-current direct current to the corresponding LED streetlamp for driving LED lamp beads to emit light, and controls luminous flux of the corresponding LED streetlamp for adjusting light. The LED streetlamp illumination light adjusting system performs AC / DC conversion on the unstable and unreliable AC mains supply to generate the constant-voltage and constant-current high voltage direct current suspended to ground, transmits the direct current to the LED streetlamps by means of the power cables, and performs remote light adjustment on the LED streetlamps by adopting the PLC remote light adjusting technology, thereby achieving the purposes of saving energy, reducing consumption, decreasing cost and expense of operation and maintenance, reducing light attenuation and prolonging service life.

Description

technical field [0001] The invention relates to a street lighting power supply and dimming system device, in particular to a LED street lighting dimming system based on a DC remote power supply, belonging to the technical field of LED street lighting. Background technique [0002] At present, the overall status of road street lighting in major cities in China is: most cities use high-pressure sodium lamps, metal halide lamps, and high-pressure mercury lamps to realize road lighting. This lighting technology belongs to the traditional lighting method. Its advantages are: mature technology, large number of applications, relatively low cost of bulbs, and moderate illuminance; The power consumption of LED lamps is more than 50% higher; 2. Not environmentally friendly: high-pressure sodium lamps emit red and yellow light, contain ultraviolet rays, and are harmful to plants and human eyes; sodium lamps, metal halide lamps and high-pressure mercury lamps contain a large number of h...

AI Technical Summary

Problems solved by technology

This lighting technology belongs to the traditional lighting method. Its advantages are: mature technology, large number of applications, relatively low cost of bulbs, and moderate illuminance; The power consumption of LED lamps is more than 50% higher; 2. Not environmentally friendly: high-pressure sodium lamps emit red and yellow light, contain ultraviolet rays, and are harmful to plants and human eyes; sodium lamps, metal halide lamps and high-pressure mercury lamps contain a large number of harmful toxin elements , such as mercury, lead, indium, dysprosium and neon, helium gas, etc., which pollute the environment and are harmful to humans; 3. Short life: a high-pressure sodium lamp has a service life of about 10,000 hours, which is 5-5 times longer than that of an LED lamp. 5-10 times shorter than that in 10 years; 4. Large maintenance and high operation and maintenance costs: the bulb needs to be replaced every two years, which is 90% higher than the maintenance of LED lights; LED lights are 2-3 times lower; 6. Red light is easy to irritate the human eyes and make the eyes tired, giving people a feeling of dizziness and darkness. It is not as friendly as the white light of LEDs to human eyes, etc.

But there are also many defects: 1. The very unstable AC power supply is still used, so that the high-voltage AC is stepped down into the mains by the box-type transformer, and then sent to the AC / DC constant current driver of the LED lamp on the lamp head of each street lamp lamp pole. , this unstable alternating current poses great harm to LED lights, especially surge shocks and lightning shocks, which can easily cause sudden changes and instability in driving voltage and current, and affect the light decay and life of LED lights; 2. Since the high-voltage alternating current directly acts on the input end of the driver through the box transformer, the constantly changing alternating current makes it difficult to keep the output voltage and current of the driver constant, resulting in large light decay and short life; 3. The voltage surge caused by lightning is directly transmitted to the driver On the input side, it is easy to cause damage to the LED, especially when the LED lamp is in a high temperature state, it is more likely to be damaged and shorten the life; 4. Due to irregular manufacturing of lamps, especially poor heat dissipation treatment of LED lamp beads or poor bonding process of lamp beads Well, the temperature of the LED lamp bead is very high and the light decay is serious and the life is shortened

Why do LED street lights have so many advantages and have not been widely used? The main reason is that the light decay is serious (the light is very bright at the beginning, and it will not be so bright after two or three years) and the short lifespan.

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