Inductive Coupled Power And Signal Transfer System With Orthogonal Multi-Carrier

With the extensive use of household appliances and electronic equipment,different types of power adapters and electrical sockets can lead to complex circuit layouts,disorganized charging sites,and serious hidden dangers,which directly affects the simplicity and aesthetics and convenience of daily life.Inductive power transfer(ICPT)technology greatly improves the security and flexibility of power supply because of its non-contact power transmission.Meanwhile,the incompatibility problem betweem different electrical equipment and chargers can also be solved.With the improvement of the comfort,convenience and intelligence of family life,the smart home system has become the main trend of family design in the future.The smart home realizes the interconnection and intelligent control of household appliances,but its power transmission is still restricted by the wired power supply.Therefore,the combination of the ICPT and the smart home technologies can truly realize the taillessness of the electrical appliances in the smart home.In order to realize various intelligent and customized functions of the electrical equipment,the combition of power transmission and signal transmission in ICPT system can realize the integration of power supply and control of various electrical equipment through the same intelligent control panel.The incompatibility problem betweem different electrical equipment and chargers can be solved and the remote control function in the smart system can be replaced through this method.Based on this research background,this paper proposes an inductive coupled power and signal transfer system with orthogonal multi-carrier(OMC-ICPST)for the non-contact power supply of home appliances.ICPT system can achieve highfrequency energy transmission through inverter circuit.In the proposed method,the fundamental and harmonic components of the inverter output voltage are used as the power carrier and the signal carrier respectively.In this method,the features of harmonics,such as low energy and high frequency,are well used.Two different carriers for power and signal transmission make the power control and signal modulation independent with each other.Hence,signal modulation is much more flexible.Meanwhile,Power carrier is exploited as a path for signal carrier,which can reduce the system's volume,magnetic interference and symbol error rate.In addition,through the parameter design,the power carrier and the signal carrier are in a state of orthogonality,which can effectively reduce the system reactive capacity and improve the transmission capacity.Firstly,this thesis introduces the technical scheme,application scenario,advantages and disadvantages of the existing synchronous transmission technology of power and signal in ICPT system.Besides,the extract of carriers and modem of signal are designed and analyzed in detail.Then,an OMC-ICPST system for wireless power supply of household appliances is designed,which is used amplitude-shift keying,noncoherent demodulation and orthogonal multi-carrier transmission technology for signal transmission.Secondly,for the problem of high magnetic flux leakage and large reactive power in OMC-ICPST system,parameters are designed to make that the center frequencies of power link and the signal link are fundamental wave frequency and the harmonic wave frequency respectively.Thereby,the reactive power in the system can be compensated and the power transmission capability and efficiency can be improved effectively.Thirdly,aimed at the performances of the power transmission and the signal transmission in OMC-ICPST system,this thesis uses voltage stability,efficiency,signal transmission rate,carrier-to-noise ratio,and bit error rate as performance metrics to optimize the parameters of signal coupling transformers.Then,a 75-W OMC-ICPST sytem is designed by the signal transmission performance as the main indicator.Finally,simulation and experimental platforms are built to verify that the system can maintain the system resonance and the stability of the power transmission during signal transmission.This system achieves synchronous transmission of power and signal with 65 W of transmission power,74% of efficiency,94% of voltage stability coefficient,6 k Bd of baud rate,12.78 d B of carrier-to-noise rate and 0.44% of symbol error rate.