In recent years, with the development of China's street lighting LED renovation project, the penetration rate of China's LED street lamps is constantly improving. In 2011, the penetration rate of China's LED street lamp market was 4.21%, reaching 8.02% in 2012 and 14.7% in 2013. As of the end of 2017, the penetration rate of domestic LED street lamps is close to 30%. According to CSA Research, it is estimated that by 2020, the penetration rate will increase to 39%.

Source: forward-looking industrial research institute

At the same time, with the advancement of LED chips and driving power technology, the problems of heat dissipation, light decay, and power supply of LED street lamps are solved.In the future, benefiting from the construction of smart cities will accelerate the widespread use of next-generation information technologies such as the Internet of Things and cloud computing.LED street lights have gradually developed towards intelligent and networked.

Intelligent control enhances the advantages of LED street light products 

The intelligent control features of LED street lights further enhance the advantages of LED street light products. By the end of September 2018, more than 25 provinces/municipalities had launched smart streetlight projects, including Beijing, Shanghai, Shenzhen, Tianjin, Chongqing, Jiangsu, and Fujian.

It is understood that in 2017, the scale of China's LED street lamp market continued to grow rapidly, reaching 11.9 billion yuan, an increase of 25.7%. It is estimated that the domestic LED street lamp market will reach 14.2 billion yuan in 2018. With the maturity of LED lighting technology and integration with the Internet of Things and smart cities, it is expected to usher in a new round of explosions by 2025.

The LED smart street lamp of huaquan lighting helps the construction of smart city

Huaquan Lighting's LED Smart Street Lights use existing powerline infrastructure and wireless technology to connect IoT sensors to create a reliable and sustainable smart city network that transforms streetlights into a dynamic, resource-efficient platform. Building a strong network architecture for the development of smart cities, providing high-quality services: centralized management of remote street lights, monitoring closed-circuit television management, intelligent parking management, car charging station management, wifi hotspots, smart home/intelligent building automation, smart grid and Metering, etc.

Smart street lamp sensor network system of smart city

Communication network technology for realizing smart street lamps  

1、Broadband power line communication（BPL）

Through the power line for broadband data communication, the network system constructed by this technology is low-cost, and there is a broadband network with electricity, which can achieve a communication bandwidth of up to 200M. The technology is mature, reliable, and simple in construction. It is not necessary to re-erect the network circuit, and does not need to move civil engineering, saving manpower and improving efficiency.

Through the broadband power line communication technology (BPL), the original cable of the street lamp is used to realize the intelligentization of each light pole.

2、Unique multi-channel PLC technology + LoRa wireless technology

At present, the general PLC communication technology on the market only has a fixed frequency channel, and it faces huge noise interference caused by various electrical equipment, especially unfiltered equipment, which cannot communicate on noisy power lines. On the other hand, Zigbee is also vulnerable to weather and other wireless signals when used in the already "blocked" 2.4 GHz spectrum!

In response to the above problems of communication, Huaquan developed a unique multi-channel PLC communication technology, which uses 18 channels of data repetition. Even if there are noise interference on some channels, other redundant channels can still be performed without any Error data communication transmission.

At the same time, in order to span different power line networks and transformers, Huaquan added the 19th wireless channel as the automatic switching and cross-domain communication based on 18 PLC channels.It enables it to fly to the ground and pass through the ground, providing an extremely reliable and stable communication network.

The advantages of this hybrid network communication technology：

Hybrid network power line carrier communication is the lowest cost, most reliable street light control communication solution. The general power line transmission scheme frequently fails in a complex power environment. Huaquan's solution uses 18 variable frequency channels, plus a combination of wireless signals will greatly improve the reliability of communication. Pure wireless solutions such as 3G, LoRa WAN, Sigfox, etc. often have the following problems. These wireless solutions require monthly payment of carrier fees, which greatly increases operating costs. In addition, these wireless solutions also need to set up additional base stations, and the initial investment is very large. And ZigBee, WiFi is used in outdoor use, there is a problem of unreliable communication.

PLC power line carrier communication power supply

 Among them, the driving power used in the smart street lamp is an intelligent control system that communicates with Huaquan lighting through power line carrier communication, which can monitor the power, current, voltage and fault information of the power supply in real time, and can also realize remote wireless intelligence. The control power supply is mainly used for engineering lighting fixtures such as LED smart street lights and tunnel lights.

Main Characteristics of PLC Power Line Carrier Communication：

1. There is no need to re-establish the network. As long as there is a wire, data transmission and networking can be performed.

2, isolation circuit design, active power factor correction, conversion efficiency of up to 92%.

3. Input over-voltage protection, the voltage exceeds 380Vac, the power supply is turned off, the voltage drops to 310~320Vac, and the power supply automatically resumes output.

4. Constant current output, the output current can be adjusted by the potentiometer of the side cover.

5. Through the power line carrier communication, the intelligent control system of Huaquan Lighting can monitor the power, current, voltage and fault information of the power supply in real time, and also realize remote wireless intelligent control.

In addition to the intelligent control, in the safety protection, the PLC power line carrier communication power supply, the output also has dual protection, to avoid the user's improper operation and burn the power supply. In addition, the unique surge protection patent technology (L-N) 10KV, (L-G/N-G) 10KV, both protect the power supply and protect the load LED light source.

Comparison of Advantages of PLC Power Line Carrier Communication Power Supply Application：

Case application analysis

As can be seen from the above figure, the street lights in the three circles represent three separate streetlight areas that are not physically connected. In such an application scenario, we deployed power line carrier communication power, single-lamp controller and hybrid network street light controller, respectively, to give full play to product technology advantages and solve the network island effect. The three islands are connected by repeaters to form a new communication network, and the repeater can also access other sensor devices to realize environmental monitoring, traffic monitoring, and manhole cover management.These data can realize the scheduling of street lighting according to the scene requirements, greatly improving urban management efficiency and traffic safety.

Case applications

Taiwan, China

At the beginning of 2018, a pilot project of 1600 盏 smart street lamps (a total of 120,000 baht) has been completed in Taoyuan County, Taiwan, and a second pilot with 5,000 street lights will be launched.More projects are continuing, including Kaohsiung, New Taipei City, Danshui and Hsinchu. All of these projects require no on-site guidance and commissioning due to a simple installation strategy.

Tshwane, South Africa

There are 250,000 high-pressure sodium lamps in Tshwane which need to be upgraded to LED intelligent street lamps. In June 2018, 200 intelligent street lamps have been installed in Tshwane as a pilot project for the transformation of 3000 intelligent street lamps. At present, only Huaquan is based on the PLC communication scheme, which conforms to the bidding documents specifications of Tshwane City. Other competitors are all wireless communication schemes.

Product quality is the lifeblood of an enterprise. Huaquan Electric Lighting adheres to the principle of quality first, strengthens the quality system and environmental protection, and establishes a first-class management system to ensure product consistency, stability and reliability. At present, lighting is becoming more and more intelligent. Huaquan Electric Lighting Company is also devoting itself to the construction of service intelligent city, applying Internet of Things technology to build "smart city" and leading the city into the era of wisdom.