异物检测系统

验证了系统的实际可行性。关键词：电动汽车，无线充电，阻抗特性，金属检测，活体检测Abstract:Electric vehicles have developed rapidly in recent years bothdomestically and abroad,and the charging methods used are mainly conductivecharging.However,there are many defects in this way,such as faulty contact,damagecaused by the rising temperature of the contact resistance,a massive charging headand uncomfortable insertion and removal.To solve these problems,wireless chargingtechnology has been developed for electric vehicles.Currently the wireless chargingsystem for electric vehicles generally adopts a horizontal point -to -point methodDuring the charging process the charging area may fall into foreign metal objects,aswell as enter foreign bodies in the living body.Alien metal objects can cause vortexcurrents after entry,which can cause fires.It can also change the parameters of thecoupling mechanism to cause the system to deviate from the normal working point.Insevere cases,the system will not work at all.The magnetic field in the charging areamay affect living tissue and cause tissue damage.It is therefore necessary to detectalien bodies and biological alien bodies,thereby ensuring the safety of the loadingprocess and the reliability of the system.On the basis of this requirement,thisdocument proposes a system for detecting foreign bodies in order to detect metals andorganisms and to ensure that the system is loaded.The article states that the purpose of the research is the charging system forwireless electric vehicles,and analyses the need to detect foreign objects inconjunction with the application requirements in the system operation process andsummarises the state of the research in the country and abroad.The analysissummarises the limitations and weaknesses of these current programmes andhighlights the importance of research in this article.With a view to the wirelesscharging system for electric vehicles,a scheme for the detection of foreign objectsbased on impedance characteristics was proposed.The principle of this scheme is thatthe metal and the organism enter the magnetic field and change the magnetic fieldparameter,which in turn changes the impedance of the measuring tube.Therefore,