Research On Wireless Energy And Signal Co-Transmission Technology Based On Magnetically Coupled Resonance

Magnetically coupled resonant radio energy transmission technology is widely used in home appliances,electric vehicles,Lunderwater detectors,etc,due to the advantage of its flexibility,convenience,safety and reliability.In the field of human implantable devices,sensor networks,etc,devices need to transmit effective control information while carrying out power transmission.Therefore,the research on the simultaneous transmission of energy and signal has important significance and application value.Based on the principle of magnetic coupling resonant radio energy transmission,the structure of power transmission system is analyzed,and a magnetically coupled resonant radio energy transmission system with full bridge inverter,series compensation and four coil structure is designed.According to the circuit theory,the system is modeled,and the influence of load,system frequency and other influence factors on the power transmission characteristics is analyzed by MATLAB software.Based on the radio energy transmission,two different power and signal synchronous transmission schemes are designed.The amplitude modulation scheme uses the difference of the duty ratio of the bootstrap booster circuit to modulate the amplitude of the voltage according to the change of the digital signal to be transmitted.The modulated voltage waveform is transmitted through the resonant coil,and is detected,filtered,and compared at the receiving end.After that,the digital signal to be transmitted is recovered.The frequency modulation scheme is to load the high fr-equency carrier carrying the digital information into the power channel through the key control,and transrmit the signal through the coupled coil,and then demodulate the digital signal after being detected,amplified,filtered and compared at the receiving end.By analyzing the transmission principle of the two schemes,the modulation and demodulation circuit of the signal,the transmitting and receiving circuits of the energy and the resonant coupling coil structure are designed.The Multisim software is used to simulate the system circuit,the transmission characteristics of the electric energy and the signal in the two schemes is analyzed.Simulation analysis shows that both schemes can realize the synchronous transmission of energy and signal.When the amplitude modulation scheme system has the best transmission performance,the signal transmission rate is 600bit/s,the output power is 41.628W,and the transmission efficiency is 82.66%,which is suitable for occasions with high transmission efficiency requirements.When the transmission performance of the frequency modulation scheme system is optimal,the carrier frequency is 900 kHz,the output power is 39.611W,and the transmission efficiency is 68.7%,which is suitable for occasions where the signal transmission rate is high.The two energy and signal synchronous transmission schemes designed in this paper provide a reference for the synchronous transmission of electrical energy and signals in different transmission environments.