Intelligent street lamps, also known as intelligent street lamps, or smart street lamps and smart lighting, use the Internet of Things and cloud computing technology to comprehensively upgrade the city's public lighting management system to achieve centralized lighting control, operation and maintenance information, and intelligent lighting.
At present, the Institute of Software Application Technology of the Chinese Academy of Sciences in Guangzhou (referred to as “Guangzhou Software Instituteâ€) is at the international advanced level in this field, and there are a large number of implementation cases in China. Due to the drawbacks of traditional street lamps: such as serious energy waste, single management means, low level of information, lack of active alarm mechanism for faults, and difficult location of fault lights, etc. In recent years, many cities in China have begun to adopt intelligent street lamp technology to transform traditional street lamps. In 2012, the implementation plan for the promotion of LED lighting products in Guangdong Province was proposed: lighting projects for financial or state-owned capital investment in roads, public places, government agencies, state-owned enterprises and institutions in Guangdong Province, as well as Nansha, Qianhai and Heng. According to the plan, the Pearl River Delta region should strive to popularize LED public lighting before the end of 2014, and promote the whole society to popularize LED lighting to realize the province. Compared with the caliber, the lighting energy consumption is more than 50%. Intelligent street lights have a lot to offer.
With the rapid development of the social economy, urban street lamps have large power consumption, low utilization rate, and low efficiency. With the increasing awareness of environmental protection and energy conservation, it is extremely important for urban construction to provide an intelligent street lamp that reduces lighting time and saves electricity, and can also reduce management expenditure. Therefore, the street lamp adopts light energy to generate electricity, adopts low-power high-brightness LED lamp, and uses ESP8266WIFI module to control the networking of the system to realize the control of mobile phone or other mobile platform. This method solves the practical problems of inflexible traditional street lamp control mode, difficult management and maintenance, and waste of power resources. It has the advantages of wide network coverage, reliable system operation, strong anti-interference ability, etc., and provides an efficient and practical solution for street lamp management. The whole system design is based on the remote communication network, providing advanced and practical solutions for streetlight control management, which can realize the goal of intelligent, informational and low-cost street lighting energy-saving control system, improve street lamp management and improve energy saving. Controlling effectiveness has important practical significance.
system designThis system adopts the single chip of STC12C5A60S2 produced by Hongjing Technology Co., Ltd. as the main control chip, and adopts 2-channel HC-SR501 infrared human body sensor to cover the detection range of 270 degrees. The main power supply of the street lamp adopts a single-crystal silicon high-efficiency solar panel power generation board, combined with a lithium battery pack and a buck-boost power supply module, which can meet the power supply requirements of the control board and the street lamp main body.
External power supply design
The solar lighting circuit uses a stepping motor shaft to connect the solar panels, and uses two light intensity sampling modules to track the solar light intensity in real time, and at the same time drive the motor to rotate with the sun to ensure maximum lighting efficiency.
Internal power supply design
The battery adopts ANJING's 12V7AH battery, which reduces 12V to 5V through one LM2596 step-down circuit for STC12 MCU and ESP8266 module, and the other uses XL6009 boost circuit to upgrade 12V to 18V for street lamp drive circuit.
Light intensity sampling circuit
The light intensity sampling circuit is starred by Longxinda LXD3537B, which has high sensitivity and stable operation. The response spectrum is from 350nm to 750nm. It is composed of 10K voltage dividing resistor and filter resistor. The sampling point voltage is read by the STC12 MCU. Strong light.
System hardware designThe hardware of each street light module includes 8266WIFI module, solar power generation module, battery power supply module STC12 single-chip control module, LED drive circuit module and street lamp entity. The system hardware structure design is shown in Figure 1.
figure 1
STC12C5A60S2 MCU is a single-clock MCU developed by Hongjing Technology Co., Ltd., which is high speed. A new generation of single-chip microcomputer with low power consumption and super anti-interference. Internally integrated 2-channel PWM, 8-channel high-speed 10-bit A/D conversion (conversion speed up to 250KB/S). 1280 bytes of RAM are integrated on-chip. Its industrial grade operating temperature range is -40 to +85C.
The ESP8266 is an ultra-low-power UART-WiFi pass-through module with industry-leading package size and ultra-low power technology to connect users' physical devices to Wi-Fi wireless networks for Internet or LAN Communication, networking capabilities. ESP8266 hardware interface is very rich, can support UART, IIC, PWM, GPIO, ADC, etc., suitable for a variety of IoT applications. The maximum transmission rate is 460800bps. The ESP8266 supports three modes: STA/AP/STA+AP.
LED power drive circuit:
The intelligent street lamp system adopts a constant current driving mode, and the integrated driving chip GM9910B is selected to drive the street lamp work. The GM9910B is an average current mode and constant control IC chip. Use a buck topology to drive LED street lights. GM9910B output current accuracy of +/-3%, no loop compensation or side current sensing, the IC chip is characterized by its HICCUP-MODE current limit to achieve LED street light short circuit protection, linear dimming input and Output PWM dimming strategy. The GM9910B allows a wide voltage input of 10-500V with greater than 90% efficiency. The output current is from 10MA-1A or more. The working frequency can reach 300KHZ.
System dimming controlStreet light self-test
The self-test system of the street lamp refers to the fact that after the street lamp is turned on, the brightness of the street lamp is insufficient or cannot be illuminated, and the self-test system starts to work. The self-test system automatically detects the light intensity signal from the LED street light source. When the light intensity is lower than the set value, it can be determined that the street light is not working properly and the fault information is fed back.
After the street lamp is powered on normally, the system can preset the steady light value of the light street light (the default PWM output duty cycle is 30%).
When the ambient light intensity is less than 50 LUX, the street light system is normally energized.
When the ambient light intensity is 50-150 LUX, the street lamp system adopts PWM dimming mode.
When the street lamp system senses the passage of the human body, the system output PWM duty cycle is 70%, and the light is long until the human body signal disappears.
When the ambient light is stronger than 300 LUX, the street light system is turned off and the solar power system works normally.
System software designSystem networking design
Street lights are the core node of the entire streetlight control. The ESP8266 module is responsible for the instruction connection between the host computer and the control core (STC12C5A60S2 microcontroller and other driver modules). First, the system initializes the host computer operation terminal and the node control terminal by default, and the ESP8266 module organizes the client and the sub-server to implement the total-minute connection. Then the program enters the interrupt loop, and detects whether there is instruction data from the console of the host computer in real time, and implements self-control according to the external environment.
Street light terminal programming
The street light terminal is to realize the transmission of information of each sub-section. Road light line acquisition control, from the control of the host computer's operating terminal, self-control. The street light automatically joins the control network and listens to the command information while entering the interrupt loop.
Operating software design
The upper computer control software is an operation terminal based on JAVA. It forms a communication network node through the Internet communication protocol and Essen's ESP8266 module. At power-on, the street light system control terminal automatically initializes and searches for the connected street light system control node. At the same time, the STC12 MCU sends an instruction to start the ESP8266 module. After the connection is successful, the operator can send commands for real-time control.
ConclusionThe system tests the data transmission between the visible range of 0.1KM or more between the nodes of each street lamp system, and the running state is good. The street lamp uses the intelligent street lamp system with advanced routing technology and realizes low-cost control, which not only eliminates the installation cost of street lamp wiring and wiring, but also adopts high-efficiency solar power generation system and large-capacity storage battery, which greatly saves energy. More environmentally friendly, its efficient drive system improves energy efficiency. The control terminal of the intelligent street lamp system can be controlled by the mobile phone end, which solves the inconvenience of the control platform of the existing system street lamp, and realizes the multifunctional function of automatic dimming and fault alarm, and has application value and promotion prospect.
| About Glass Fiber Series Wire |
The insulation material uses 160 pieces /250 pieces non-alkali yarn glass fiber yarn, which is characterized by thin insulation layer, light weight and protective effect on inner insulation.Impregnating varnish used modified epoxy paint, epoxy, conforms to the ROHS certification, with excellent electrical properties and high mechanical and damp and hot resistance, suitable for ac, dc motor, synchronous generator, dry type transformer and high temperature electric appliance coil and winding, the high voltage ac motor, large dc motor, large wind turbines, glass envelope envelope particularly suited to 10 kv transformer and large and medium-sized high-voltage motor winding.
Glass Fiber Copper Wire
Name
Insulation Glass Fiber Winding Wire
Conductor
Copper
Dimension(mm)
Round: 1.0 ~ 7.0
Rectangular: Thickness(a): 1.0 ~ 10.0
Width(b): 3.0 ~ 35
Insulation Material Type
Fiber Glass
Insulation Thickness
Singer, double or according to your requirement
Standard
IEC; ISO9000; ISO9001; IATF16949
Packing
100kg ~120kg ply-wood spool (250*500)
Application
Oil-immersed transformer windings, medium
and large electrical motor and power substations, etc.
Glass Fiber Aluminium Wire
Name
Insulation Glass Fiber Winding Wire
Conductor
Aluminum
Dimension(mm)
Rectangular: Thickness(a): 1.0 ~10.0
Width(b): 3.0 ~ 35
Insulation Material Type
Fiber Glass
Insulation Thickness
Single, double or according to your requirement
Standard
IEC; ISO9000; ISO9001; IATF16949
Packing
50kg~150kg ply-wood spool (250*500/
250*550/ 250*600)
Application
Oil-immersed transformer windings, medium
and large electrical motor and power substations, etc.
Copper Flat Wire,Glass Fiber Series Wire,Double Glass-Fiber Copper Flat Wire,Fiberglass Copper Wire For Motor
HENAN HUAYANG ELECTRICAL TECHNOLOGY GROUP CO.,LTD , https://www.huaonwire.com