| Inductively coupled power transfer(ICPT)technology provides a new type of electric energy transmission option,which utilizes the principle of electromagnetic induction,power electronics technology and modern control technology,ICPT make use of high frequency magnetic field to realize power transfer from power supply to electricity equipments wirelessly,without any electric contact.In recent years,smart home has gained more and more attentions from the market,consumer electronics and portable electronic equipments have become a necessity for people to work and live."No tail" home appliances,kitchen appliances and wireless charging mobile phones can help people get rid of the limitations of traditional power cables,the ease of use and convenient operation characters make it more and more popular among consumers.Presently lots of “wireless power supply” for these products are dedicated,due to voltage and power level differences,most applications are powered by a separate system,especially in the same area(for example the desktop,work table),this will result in high cost of equipment and waste of resources unavoidably.To solve this issue,a multi-region ICPT system capable of providing electrical energy for a number of different electrical devices in a small range at the same time to realize wireless transmission of power is studied in this paper.The main research work is as followsParameters may change due to mutual inductance variation in the multi-region system and lead to problems such as resonance point offset and performance reduction.In order to solve these problems,the influencing factors of mutual inductance between regions are analyzed,and measures to reduce or even eliminate such effects are given.The switch-on and switch-off for the region load may change the resonant parameters of other region circuits and affect the work of the main circuit,aiming at this issue,the region equivalent model is established.Through the analysis and simulation,it's verified that switch-on/off for the region load will not change other region circuit resonant parameters,so that the normal operation of other regions will not be affected.In order to meet the needs of different voltage and power levels in each region,the system adopts the LCL-P type compensation network topology in combination with the characteristics of the load.System model based on two-port theory and reflection impedance theory is established.The constraints of LCL network output voltage stabilization,voltage n times amplification and soft switching operation are given.The output voltage,current,power and efficiency of the system under given conditions are analyzed.And then a parameter design method for LCL multi-region ICPT system is proposed.The method can realize that the primary side constant voltage secondary side constant current is independent of the load.ZCS operation is achieved so that the switching loss is reduced and system efficiency is improved.By changing the compensation inductance to change its ratio with the primary coil inductance,the system output voltage can be changed,different regions can achieve boost or buck function,with a wide output voltage range.Finally,the LCL multi-region ICPT system of two regions was designed.Simulation model was established with Matlab/Simulink platform.According to the simulation model,corresponding experimental setup was built.Simulation and experimental results have verified the correctness of the previous analysis and the feasibility of the proposed method. |
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