| Wireless power transmission technology is a way to achieve power transmission through electromagnetic effects or energy exchange without contact.It gets rid of the limitations of traditional lines and shows greater advantages than traditional power supply methods in terms of safety and flexibility.It is widely used in electric vehicles,smart homes and implanted medical care,and has a wide range of development and application prospects.In more fields such as human implantable devices and sensor networks,it is also necessary to transfer information synchronously to transmit control information or feedback detected signals while realizing wireless power supply.With the deepening of wireless power transmission technology,energy and synchronous transmission of signals has become one of the key technologies to expand the application field of wireless power transmission technology,and has become another research hotspot.In this paper,combining the requirements of maglev train gap sensors in power supply and signal transmission,a set of wireless energy and signal reverse synchronous transmission system based on S-LCC resonance compensation is designed.The key point is to realize the voltage stabilization characteristics of the output terminal while adopting the same loose coupling mechanism to realize the synchronous reverse transmission of the signal.The energy transmission channel,signal transmission channel and the crosstalk between energy transmission and signal transmission of the system are analyzed respectively.First of all,for the energy transmission channel,the design is carried out from the topological structure and coil optimization,aiming to improve the coupling coefficient of the loosely coupled transformer and realize the constant voltage output at the load.Under the limitation of the specified size,by simulating the circular coil,the influence of various parameters of the coil on the coupling coefficient is analyzed,the coil parameters are optimized,and the coupling coefficient of the loosely coupled transformer is improved.At the same time,the energy transmission system of S-LCC topology with tightly coupled transformer is analyzed,and the relationship between the system parameters with the output voltage and the principle of keeping constant output voltage are clarified.For the signal transmission channel,analysis and design are carried out from several aspects such as signal injection method,signal modulation and demodulation method,and modulation and demodulation circuit.The two major factors that determine the signal transmission rate,the voltage gain of the signal transmission channel and the crosstalk of the energy transmission channel to the signal transmission channel are analyzed.Combined with theoretical analysis and simulation research,the influence of inductance,resistance and other related parameters in the system on the signal transmission is determined.And the parameter design is carried out from the perspective of both energy transmission and signal transmission.Finally,an experimental platform for the corresponding energy and signal synchronous reverse transmission system was built.The 24 V constant voltage output of the gap sensor is realized.At the same time,the sensor synchronously reversely transmits 100kbit/s gap information and acceleration information through the same loose coupling mechanism,which verifies the reliability and effectiveness of the system. |
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