LED street lighting dimming system based on DC remote power supply

Abstract

A LED street lighting dimming system based on a DC remote power supply, which includes a DC remote power supply local end device and a number of LED street lamp control devices. The DC remote power supply converts the AC mains to AC / DC to generate a constant voltage Constant current, high-voltage direct current suspended to the ground is transmitted to the LED street lamp control device through the power cable, and the LED street lamp control device is connected to the corresponding LED street lamp. On the one hand, it controls the luminous flux of LED street lamps for dimming. The invention converts the unstable and unreliable AC power to AC / DC to generate a high-voltage direct current with constant voltage and constant current suspended to the ground, and transmits it to the LED street lamp through the power cable, and at the same time controls the LED through the PLC remote dimming technology. The street lamp implements remote dimming, so as to achieve the purpose of saving energy and reducing consumption, reducing operation and maintenance costs, reducing light decay and prolonging life.

Description

Technical field [0001] The invention relates to a street lamp lighting power supply and dimming system device, in particular to an LED street lamp lighting dimming system based on a DC remote power supply, belonging to the technical field of LED street lamp lighting. Background technique [0002] At present, the overall status quo of road street lighting in major cities in China is that most cities use high-pressure sodium lamps, metal halide lamps, and high-pressure mercury lamps to achieve 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; its disadvantages are: 1. High energy consumption: high-pressure sodium lamps that provide the same illuminance for the road are better than The power consumption of LED lamps is more than 50% higher; 2. Not environmentally friendly: high-pressure sodium lamps emit red and yellow light, ...

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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