The Design And Implementation Of Microwave Wireless Power Transmission System In Nuclear Radiation Environment

Wireless power transmission is a technology that has been under research for a long time,allowing energy to be delivered to the electrical end of the grid without a physical connection.There are many ways of wireless power transmission,among which microwave wireless power transmission is the most widely studied radio energy transmission technology that can transmit over a long distance.At present,nuclear physics technology has been quite developed,such as nuclear power plants,nuclear weapons,etc.,but nuclear accidents also occur,and the endurance problem of nuclear emergency rescue equipment needs to be solved urgently,and the use of microwave wireless power transmission technology for long-distance wireless power supply is a very feasible and forward-looking solution.In this paper,a 2.45 GHz microwave wireless power supply system that can withstand a total dose of 500 Gy is designed by combining the nuclear radiation environment scene with the microwave wireless power supply technology.The maximum DC output power of the system is more than 50 W and the maximum efficiency is more than 10%.In this paper,the overall structure of the microwave wireless power supply system is planned,and the corresponding index decomposition is carried out,and the system is divided into three parts for design.It is mainly divided into microwave transmitting terminal,receiving rectifier antenna and back-end processing circuit of microwave wireless power supply system.Firstly,this paper selects a suitable microwave source and transmitting antenna,and designs a set of microwave transmitting terminal radiating200 W microwave power.Then,a circularly polarized microstrip patch antenna with excellent performance is simulated and optimized by using HFSS simulation software,which is used as the receiving antenna of the receiving unit at the receiving end of the microwave wireless power supply system.Then,the ADS simulation software was used to design a voltage doubling microwave rectifier circuit with simplified structure.The structure of the rectifier circuit was optimized,and the filter in the conventional rectifier circuit was removed to reduce the insertion loss and improve the efficiency.Under the condition of using FR4 conventional plate,the rectification efficiency is more than 71%,and the rectifier circuit is integrated with the receiving antenna,and the compact and compact rectification antenna is designed and made.In order to improve the power supply capacity of the microwave wireless power supply system,a single rectifier antenna is used as a unit to form a receiving rectifier antenna array by series and parallel combination,and finally the output power of 50 W is reached.In order to adapt the system to more load conditions and maintain the optimal transmission efficiency,this paper designed the back-end processing circuit.In addition to voltage transformation,the maximum power tracking algorithm was added to optimize the charging power for the battery charging scene of mobile devices,so as to maintain the maximum power output and improve the transmission efficiency of the system.Finally,the designed system was tested for radiation resistance in China Institute of Radiation Protection,and it still works normally after being exposed to 500 Gy.It is proved that microwave wireless power supply technology and nuclear radiation application scenarios can be perfectly combined.