| Wireless power transmission(WPT)technology is free of the wired access mode of traditional power supply mode,and can realize the non-contact transmission of electric energy between power supply and receiving equipment.Therefore,it has the incomparable advantages of traditional wired power supply mode such as safety,nonwear,flexible power supply.Among many WPT technologies,inductively coupled power transfer(ICPT)technology has received extensive attention and research from scholars and scientific research institutions due to its high transmission power and high transmission efficiency.The related technical products have also been successfully applied,so ICPT technology has broad application prospects.In order to meet the growing demand of society,ICPT technology is developing in the direction of high power,high efficiency and high controllability.According to the different output voltages required by the load,it is of great significance to realize widerange,high-precision output voltage regulation and high-efficiency power transmission of the ICPT system.The existing ICPT system mainly performs power transmission based on the idea of "basic wave utilization-harmonic elimination",suppresses the harmonic content in the square wave of the inverter output,and uses its fundamental component to perform power transmission.However,harmonic is also a kind of energy that can be utilized,if it can be utilized,it can overcome the problems of insufficient output voltage regulation range,insufficient high voltage regulation accuracy and high system efficiency caused by the existing fundamental energy transmission.Based on the "high frequency,low energy" characteristics of harmonics,this paper proposes a fundamental-harmonic dual-channel parallel ICPT system,which establishes the fundamental energy path and harmonic energy path at the output of the inverter.The fundamental wave and harmonics in the square wave are extracted and utilized to broaden the voltage regulation range of the system and also improve the transmission efficiency of the system.This paper firstly introduces the research background,the structure and principle of ICPT system,the research status of ICPT technology,and analyzes the purpose and significance of this paper.Then,the basic structure and working principle of fundamental-harmonic dual-channel parallel ICPT system are proposed and elaborated.The modeling method of the system,the dual-channel frequency selection characteristics and the wide-range voltage regulation method are studied in detail.At the same time,the parameter design method of fundamental-harmonic dual-channel parallel ICPT system is expounded.After that,for the design requirements of the fundamental-harmonic dual-channel parallel ICPT system,a two-channel orthogonal DD electromagnetic coupler is designed,and the design principle,structural composition,and dual-path decoupling of the electromagnetic coupler are designed.The parameters optimization and offset characteristics are studied in detail.Furthermore,the fundamental-harmonic dual-channel parallel ICPT system is simulated,which can realize 500 W power transmission.At the same time,the system output voltage is between 0 ~ 113 V for different working modes of the system and with phase shift control strategy.Finally,a complete experimental platform is built for experimental verification.The experimental results show that the electromagnetic decoupling between the two paths of the fundamental-harmonic dual-channel parallel ICPT system can be fully realized by the two-channel orthogonal DD electromagnetic coupler,and the fundamental-harmonic dual-channel parallel ICPT system can achieve a wide range of system output voltage regulation and achieve efficient power transmission.The experimental results verify the correctness,effectiveness and technical feasibility of the research. |
PDF Full Text Request