Design And Construction Of Underwater Ultrasonic Simultaneous Wireless Information And Power Transfer System

With the continuous development and progress of wireless communication and wireless energy transmission technology,In the fields of modern defense and medical treatment,ultrasonic simultaneous wireless information and power transfer has its unique application value due to their advantages such as good directionality,large energy,and strong penetration ability.The use of ultrasonic simultaneous wireless information and power transfer technology to intelligently supply power to underwater sensor networks and implanted medical devices can improve the safety and availability of energy supply systems while ensuring energy transmission efficiency.At present,the development of underwater ultrasonic simultaneous wireless information and power transfer technology is not yet perfect.Further improvement of ultrasonic energy transmission efficiency and high availability of ultrasonic communication links are two difficult problems to be solved urgently.Since the resonance state of the ultrasonic wireless energy transmission system will change with the changes of the transducer probe spacing,the transmission medium,and the load on the receiving end,it is necessary to find a technical solution that can automatically track the resonance state to ensure underwater ultrasonic simultaneous wireless information and power transfer system can work stably under high transmission efficiency.This article builds a complete underwater ultrasonic wireless energy-carrying communication system.On the one hand,the design of high-efficiency inverter circuit,impedance matching circuit,low-power rectifier filter and DC-DC voltage regulator circuit to improve the energy transmission efficiency of the system.Further,frequency tracking and distance tracking are adopted to solve the problem of resonance state tracking,which further improves the energy transfer efficiency.On the other hand,2ASK modulation and demodulation circuit based on ultrasonic communication is designed,whose data transmission rate can be tested to reach 9.6kbps.Subsequently,a performance test was carried out on the built underwater ultrasonic simultaneous wireless information and power transfer system.The results show that under the conditions of transmission frequency of 155 k Hz,transmission power of 3.8W,and probe spacing of 1cm,the power obtained by the load circuit at the receiving end reached 350 m W,the system transmission efficiency reached 9.2%.Using the ultrasonic energy transmission system to charge a lithium battery with a rated voltage of 3.7V and a capacity of 150 m Ah,it can charge more than 60% of the electricity in 1 hour,and the average charging power is measured to be about 330 m W.This paper also simulates real application scenarios by separating metal and pork tissue,changing water temperature and salinity and other conditions,tested the performance of underwater ultrasonic simultaneous wireless information and power transfer system platform.Experiments show that ultrasound wave can penetrate tissues and metals housing well to supplies power to the implantable device.At the same time,the efficiency of ultrasonic energy transmission will gradually decrease with the increase of the ambient temperature.However,the change of the medium salinity has no obvious effect on the performance of the underwater ultrasonic simultaneous wireless information and power transfer system.