Study On Efficiency Optimization Of The ICPT System With A Wide Range Of Power

As an important branch of the wireless power transfer system, inductively coupledpower transfer (ICPT) refers to the use of space electromagnetic coupling to transferelectricity power from a stationary power source to one or more movable loads. Theapplication of wide power transmission and high efficiency of power transmission ofICPT system are the current development trend of ICPT technology. This paper targetsefficient and stable operation of a variety of home appliances with multiple power levelsin the ICPT common energy launch platform, to achieve adaptive control of the systemoperating frequency and efficiency. By analyzing the system structure, characteristicparameters, designing capacitor array dynamic adjustment programs and improvedfuzzy control strategy, to ensure the system to satisfy the requirements of highefficiency and stable operation when the loads with different power levels switching.The main works of this paper is as follows:①In order to improve the system compatibility of multi-load with different powerlevels to ensure system efficient and stable operation for the loads randomnesscharacteristics in the common energy launch platform. Based on the stroboscopicmapping method and fixed points theory, the accurate mathematical model of ICPTsystem and soft-switching frequency model have been established. The operationfrequency characteristics and output characteristics of the system with loads changingstochastically are analyzed. The study of efficiency optimization with the change of loadpower levels has been made through the established current mode and efficiency model.The dynamic adjustment circuit with capacitor array and an improved Fuzzy Controlstrategy is designed to ensure the stability of the resonant operational frequency whenthe load changes by controlling the effective value of the primary resonant capacitorarray. This method promotes the power transfer efficiency and stability of the ICPTsystem.②Based on energy injection and free resonant mode, an approach to optimize thestartup frequency setting of the ICPT system is proposed to mitigate the effects ofuncertain load conditions. Thus the system can smoothly move from thefixed-frequency startup to the variable frequency control mode and this method alsoinitiates immediate protection when the system operates under zero loads. Based onenergy injection and free resonant mode, an approach to detect loads conditions of the ICPT system is proposed to identify the load information. So it creates a safe andreliable setup process of ICPT system common energy supply platform with loadsvarying.③The threshold of primary resonant capacitor according the system ofmulti-power levels and the capacitance value to achieve required efficiency are obtainedby analyzing the relationship between the primary resonant capacitor and the outputpower. The dynamic adjustment circuit with capacitor array of two types has beendesigned to control the frequency and efficiency of the system, based on therequirements of the system volume, the control precision and the adjustment of thecapacitor array.