Research On Magnetic Coupling Resonant Radio Energy And Signal Synchronous Transmission

Wireless power transmission technology is a hot research topic in recent years. This technology overcomes the dependence on electrical equipment line, and simplifies the structure, creates a new kind of energy transmission. It also makes a great contribution for the development of human technology.As an important way of wireless power transmission, Wireless power transfer via coupled magnetic resonances has been widely used in many fields, such as household appliances, implantable medical equipment, electric vehicles, wearable devices. In the actual industrial production, wireless power transmission in the process is often inseparable from the wireless transmission of signals. The wireless transmission of power and signals mostly rely on additional signal channel besides the power transmission path, thus makes the device bulky jumbled. At the same time its flexibility is deteriorated and reliability is reduced. In order to solve the above problems, a synchronization transmission method of power and signal with the same channel was mainly presented.Firstly, the basic components and working principle of wireless power transfer via coupled magnetic resonances system was introduced, and the current wireless power and signal transmission methods was studied. By comparing their advantages and disadvantages, the wireless synchronization transmission of power and signal system based on wireless power transfer via coupled magnetic resonances was designed.Secondly, the forward signal transmission system which is from the primary side to the secondary side was designed. By comparing recent digital communications, ASK modulation and demodulation was selected as signal loading and recovery. Then signal loading circuit, resonators, signal extraction coil, signal recovery circuit was designed, and some experimental research also was done based on this system.Thirdly, the backward signal transmission system which is from the secondary side to the primary side was designed. The influence between the compensation of secondary side and the input current of the primary side was studied in this paper, a way of loading backward signal by changing the compensation of secondary side was came up, then the signal was recovered according to changes in the primary energy flow. The characterizing of different compensation way and different compensation element was studied in this paper, and a parallel resistor was selected as compensation, then the compensation circuit was designed, some experiments was also done on this system.Finally, some analysis about power and signal transmission quality was done. The basic frequency and distance characteristics of wireless power transfer via coupled magnetic resonances platform was studied, then the impact of power transmission quality by resonator coil and the impact of signal extraction quality by the signal extraction coil were studied, besides the forward and reverse signal transmission characteristics and their influence on power transmission were studied.