Research On Wireless Synchronization Transmission Technology Of High-Efficiency Power And Full-Duplex Data

With the development of power electronics technology,wireless power transfer(WPT)technology has been more and more widely studied in recent years.Practical WPT systems have emerged,and are recognized by consumers for their flexibility,safety,and reliability.Due to the complex application environment,the stability of the WPT system is easily affected by factors such as input voltage fluctuations,electromagnetic coupling mechanism shifts,and sudden load changes.How to improve the efficiency and stability of the WPT system is the focus of research on related topics.Thus,the thesis starts to study wireless power and data synchronous transfer system.In order to solve the problem of output power fluctuations,the thesis proposes a WPT system based on the interleaved Boost full-bridge inverter,which controls the output through the duty cycle of the primary interleaved Boost full-bridge inverter.The characteristics of the inverter boost output can help achieve stable power output,while reducing the complexity of the system and improving the efficiency of the system.The WPT system proposed in the thesis is a fully controlled system.Therefore,in order to achieve closed-loop control,the output information collected by the secondary side needs to be transmitted to the primary side controller through wireless communication,and the primary side controller regulates the system output.The traditional wireless communication method is not suitable for the strong magnetic interference environment such as WPT system.Therefore,the thesis proposes a wireless power and data synchronous transfer system.The data transfer circuit is connected to the coil of the power transfer circuit through a tap.The isolation of power transfer and data transfer is achieved by the principle of frequency division multiplexing.The thesis also analyzes the interference between power transfer and data transfer,and proposes an optimized design method for the position of the coil taps.In order to obtain excellent dynamic characteristics,the thesis establishes a generalized state equation for the WPT system based on the Generalized State-Space Averaging method,and then obtains the small signal model of the system,and designs a reasonable compensator according to the established system model.Combining the proposed wireless power and data synchronous transfer technology to realize the communication between the primary and secondary sides,transmitting the current and other data output from the secondary side to the primary side controller,and adjusting the duty ratio of the primary side inverter to realize the stable and controllable current output of the secondary side receiver.Finally,a prototype was built according to the proposed system structure and parameter design method.Under the condition of 60 mm air gap between the primary and secondary sides,1000 W wireless power transfer and 500 kbps full-duplex wireless data transfer were simultaneously achieved,and the system performance was excellent.