| As a new type of power supply,wireless power transmission technology has been widely used in many fields such as consumer electronics,household appliances and special applications due to its unique safety,convenience and beauty advantages.However,as a new technology,there are still some problems in practical applications that need to be solved.In most applications of wireless power transmission technology,not only the transmission of electrical energy,but also the transmission of information is needed to achieve output voltage feedback control,load detection,state monitoring,multi-controller synchronization and other functions to ensure the effectiveness and safety of power transmission.At the same time,when the wireless power transmission equipment is in use,the transmission power and efficiency of the system fluctuate with the relative displacement between the coupling mechanisms,which affects the stability and high efficiency of the system operation.Aiming at the above problems,this paper constructs a wireless power and information synchronous transmission system based on Double-D coupling mechanism and LCC resonant topology.The system is mainly divided into two parts: power transmission system and information transmission system.In the construction of power transmission system,this paper mainly discusses the analysis methods of the main components of the system and the analysis of the transmission characteristics of the system.In this paper,the coupling mechanism is analyzed by the mutual inductance equivalent model,the fundamental analysis and AC/DC impedance transformation are used to simplify the analysis of the inverter source and the rectification filter circuit respectively,also the parameter calculation formula and basic transmission characteristics of the LCC resonant topology are given.In the specific analysis of the transmission characteristics of the system,the transmission characteristics of the power transmission system using the LCC resonant topology are mainly discussed.The LCC resonant topology has a variety of design methods.In this paper according to the correspondence between the primary and secondary resonant frequency points,the transmission characteristics of the bilateral LCC radio energy transmission system are analyzed from the perspective of symmetry and asymmetry.In the construction of information transmission system,this paper mainly proposes an improved injection communication technology that can realize half-duplex communication function and analyzes the realization of energy modulation type FSK simplex communication technology.Aiming at the double-coil structure with stronger offset adaptability adopted by the coupling mechanism in the power transmission system,this paper proposes a new injection communication technology to realize the synchronous transmission of electric energy and information.The method cleverly utilizes the characteristics of the Double-D coupling mechanism,and the modulated OOK communication signal is loaded through the coupling transformer to the two ends of the two D-type transmitting coils equivalent in parallel,the signal can be transmitted to the communication receiving end substantially non-destructively,which improves the transmission efficiency and anti-offset capability of the communication system,compared with the traditional injection communication method,the power transmission efficiency is improved because no additional wave blockers or inductors need to be added,the use of bilateral LCC compensation network features high quality factor and strong frequency selection ability,effectively reducing the influence of higher harmonics generated by inverter and rectification links on communication signal transmission,at the same time,due to the use of symmetric topology design,half-duplex communication function is realized.In order to realize the full-duplex communication function,the LCC structure is adopted for the resonant topology in the power transmission system,this paper discusses the achievability of the energy modulation FSK simplex communication technology.The bilateral LCC resonant compensation network has a plurality of operating frequencies with uniform transmission characteristics under certain parameter design,and can realize energy-modulated FSK communication well without affecting the stability of power transmission.The energy modulation FSK communication technology and the improved injection communication technology have less interference with each other and can work normally at the same time,which is completing the full duplex communication function of the system.Finally,in order to verify the correctness of the theory,an experimental system for synchronous transmission of information and energy is built,which includes carrying out power transmission characteristics,improved injection half-duplex communication,energy modulation FSK simplex communication,full-duplex communication,cross interference,etc.relevant tests.The experimental results show that the system realizes 150 W power transmission,and the power transmission DC-DC efficiency is 90%,the system has full-duplex communication function.The improved injection half-duplex communication system has a transmission rate of 60 kbps and the communication link loss is only 42 mW,the interaction between transmission and information transmission is very small;the energy modulation type FSK simplex communication system has a transmission rate of 6 kbps,which basically does not cause fluctuations in power transmission. |
