1 Introduction With the rapid development of the global economy, the problem of energy shortage has increasingly become the focus of attention from all walks of life. Solar energy, wind energy and other new energy sources are more and more widely used in various fields, and the proportion of the proportion is gradually increasing. As a new achievement in the application of solar energy in the field of traffic management, Jerry Solar wireless signal system came into being. This system solves two important problems: one is due to the application of solar power technology, which no longer requires mains power supply, which is more energy-saving and environmentally friendly; and the second is the combination of wireless communication technology and solar power technology Distributed control, no need for any cable connection between the extensions of the system, which saves a series of engineering costs such as buried pipes and wiring, greatly reduces the overall cost of the signal control system, and truly saves time, effort, and money . It is foreseeable that the Jerry solar wireless signal system, which is born in response to the trend of the times, will bring new models to the transformation of the traffic signal control system. The generation of solar wireless signal system has experienced a process of exploration and innovation. At the beginning of the project, there was no mature precedent at home and abroad. The wireless communication technology used in the early wireless signal systems was relatively backward: the communication error rate was high, the communication distance was limited, and the reliability of communication was difficult to guarantee. More importantly, there was no The wireless signal system combined with solar power supply technology cannot truly exert its wireless advantages because of the need for power leads, and there is no comparative advantage in energy saving and environmental protection. After fully understanding the system, and on the basis of experimenting with multiple wireless technologies, we have selected wireless communication components and wireless communication protocols to implement wireless communication control in several schemes, and combined with mature solar power technology The wireless design jointly realizes the design scheme of the distributed control system without cable connection. After many on-site verification tests and continuous improvements, the solar wireless signal system realizes the functions of self-organization, self-detection and self-recovery of wireless communication, and realizes the charge and discharge control and protection functions of the solar power supply system, and realizes the wireless distribution Design goal of high reliability control. The characteristics and design ideas of this system will be introduced in detail below. 2 System composition and characteristics 2.1 System configuration The whole system is composed of signal control equipment and solar power equipment distributed in four directions. The four directions are controlled by a host and three slaves (the number of slaves can be selected according to the actual intersection). The direction equipment of the host is solar power equipment, the host and the control box, and solar signal lights; the direction equipment of the slave is solar power equipment, slaves, and solar signal lights. The system configuration diagram is shown in Figure 1. 2.2 System characteristics This system has carried out many innovative designs, and its main design features include: The whole system adopts master-slave distributed architecture design. One master and many slaves, the number of slaves is optional between 0-3. The master and slave respectively control multiple sets of signal lights in different directions. Each extension is independently powered by solar energy, and wireless control is used between the master and slave units. No cable connection is needed between each extension, which greatly saves engineering costs. The system uses distributed solar power technology. The solar power supply sub-system realizes the charge and discharge control functions between the solar panel, the storage battery and the load, and has control functions such as undervoltage protection, overcharge protection, hysteretic start, and hysteretic charging. Effectively extend battery life and improve reliability. Due to the use of solar power, there is no need for commercial power supply, and the system is both energy-saving and environmentally friendly. The wireless communication technology is used for control between the master and slave. Through the highly reliable, high anti-interference and self-resetting wireless communication components combined with perfect communication protocols, the system wireless control is effectively achieved. The system's wireless communication protocol adopts the scheme of sending and responding combined with periodic patrol inspection. It also has multiple communication fault diagnosis and correction capabilities, including: message error retransmission, watchdog time limit reset, message head and tail self-recovery design The self-diagnosis and recovery design such as system time limit reset can effectively shield the interference of external signals such as lightning strikes and radio. The system has the functions of self-organization, self-test and self-recovery. When power failure, communication failure, control failure, etc. occur in the master or slave, the system can automatically enter the yellow flashing state. When the solar power supply is restored or the fault is eliminated, the system can automatically return to the normal operating state. The whole system adopts power-saving design, the master-slave machine enters the power-saving mode immediately after starting, and the signal lamp also adopts energy-saving LED design. The man-machine interface with patented technology is convenient and fast to operate. The user can complete various settings according to the menu prompt without referring to the instruction manual. 3 System software and hardware design summary 3.1 Design summary of wireless communication protocol The design of wireless communication protocol is an important part of system design. In the design of this system, we have adopted many measures to ensure the strictness, safety and reliability of the protocol, and realized the functions of self-organization, self-test and self-recovery. The design points are as follows: Asynchronous serial communication baud rate 9600bps, 1 start bit, 8 data bits, 1 stop bit, odd parity; After power-on verification, it sends verification signals to all slaves; Scheme sending will send the running scheme to all slaves; Fault diagnosis and treatment for emergency treatment of various accidental and short-term communication failures; Time calibration and patrol inspection respond to the timing of each slave, and implement patrol inspection at the same time to deal with long-term failures. 3.2 System host design summary 3.2.1 Host hardware design The host of solar wireless signal system is mainly composed of the following parts: SCM, main control chip, adopt Winbond W78E516B; CPLD interface control chip, using ALTERA products; Wireless communication module ISM frequency band, no application required, transmit power 50mW, communication distance 200m; The panel display and light output are realized by DC drive technology; Peripheral circuits include storage, clock, keyboard, serial port, power supply, etc. 3.2.2 Host software design The host software consists of a main program and four interrupt programs: The main program completes system initialization, LCD display, watchdog service, keyboard processing, and communication processing. Interrupt service program: serial port transceiver interrupt program, keyboard interrupt program, 500ms timer interrupt program, 1 second interrupt service program. 3.3 Summary of system slave design The slave hardware consists of a single chip microcomputer, a wireless communication module, a lamp driving circuit, a watchdog chip and a power supply. Slave software includes main program and interrupt service program. The main program completes initialization, communication control, light state control, watchdog service, etc. The interrupt service program includes: serial interrupt service program and 500ms timer interrupt. 3.4 Design Summary of Solar Power Subsystem The design of solar power supply system mainly considers the following design elements: The maximum power of the power load; The maximum discharge time of the battery on a cloudy day; The maximum charging time when the solar panel fully charges the battery; Local average sunshine time; Local latitude The solar power control circuit must have hysteretic start and hysteretic charging functions. 4 Summary Jerry Solar Wireless Signal System, which uses solar power supply combined with wireless communication technology to achieve distributed control, is an innovative product. Compared with the previous system, the system adopts a scheme to send and answer wireless communication protocol, and uses a variety of self-diagnosis and recovery design methods to make it excellent in anti-lightning and anti-jamming capabilities, system self-organization and self-recovery capabilities. Performance; in particular, the system combines solar power technology, which is more energy-saving and environmentally friendly, in line with the direction of the national energy policy; because the system truly realizes no cable connection between extensions, the materials and labor costs of buried pipelines and cables are completely eliminated The overall cost of the system is much lower than that of the commercial power system, thus saving time, effort and money! On the whole, the system is a product with high practicability and high cost performance, which has been practically applied in many countries and countries such as Bulgaria and Nigeria, and has obtained a good price. I believe that with the improvement of market awareness, solar wireless signal systems will definitely have more application space! UPS Maintenance Bypass Switch,Rack Mounted PDU,Maintenance Bypass Switch For UPS,UPS PDU Shenzhen Unitronic Power System Co., Ltd , https://www.unitronicpower.com