Research On Frequency Tracking And Regulation Technology Of Wireless Charging System

With the continuous progress of science and technology,more and more high-tech products begin to enter our daily life.Electrical equipment has become an indispensable part of our daily life,in the traditional process of using electrical equipment,the wired input of power supply is essential.With the continuous improvement of living standards,more and more household electrical equipment,but with the increasing use of electrical equipment,the original family pre-installed socket began to appear insufficient.At this time,many people began to use external drag line plugs or other multi-function sockets,This situation will lead to the overload use of sockets due to the different power of electrical equipment,which will cause fire to our lives and property safety inestimable loss.At this time,with the demand of relieving power sockets,wireless charging system began to enter people’s life,among which the common wireless charging devices are mobile phones,sweeping robots and wireless medical equipment.The wireless charging system not only alleviates the strain on electrical outlets,but also avoids the dangers of aging transmission lines or rain or snow.This paper mainly studies the wireless charging system in the state of high loss through the control strategy to reduce the corresponding loss,improve the utilization of electric energy.Wireless charging system mainly has three transmission modes: induction,microwave and magnetic coupling resonance,At present,inductive wireless charging system is mainly used for short distance power transmission.In order to pursue longer transmission distance and higher transmission efficiency,the research focus has turned to magnetically coupled resonant wireless charging.The magnetically coupled resonant wireless charging system uses compensation capacitor and resonant inductor to make the whole system in a state of pure resistance under the resonant frequency of high frequency inverter.In resonant wireless charging system,capacitance generally does not change,but the electrical load,the selection of coupling coil and the change of coil position will affect the transmission capacity of the whole system to a certain extent.In this paper,the selection of the coil and the influence of the coupling coil on the area and transmission distance change are explored,and the corresponding measures are taken to avoid the impact of load on the transmission efficiency of the whole system.A control strategy of frequency tracking adjustment is proposed to reduce the transmission efficiency caused by the transmission distance and opposite area of the coupling coil,which can improve the low transmission efficiency of the whole system in the detuning state.The frequency splitting phenomenon caused by load change was suppressed by applying Buck circuit at the load end.Wireless charging system mainly using phase-locked loop frequency tracking adjustment technology for real-time tracking capture phase of the whole system and the corresponding control makes the whole system under the mismatch condition by adjusting the frequency of high frequency inverter system to reduce the impedance value of the whole system makes the system a pure resistance state again.The power loss of the whole transmission system is reduced,so as to improve the transmission efficiency of the whole system.Finally,the feasibility of the scheme is verified by building the platform of the experimental system.Figure [68] Reference [80] Table[2]...