|
In recent years, with the rapid development of power electronic technology,electronic products have higher and higher requirements on the performance of thepower supply. Normal power supply must through the power cord and signal wireconnection to complete, this way of power supply is unable to get rid of the shackles ofcable, it will result in the risk of discharge due to wire contact, friction, etc, and also itsuse is quite inconvenient. The wireless power transmission technology, as a new type ofpower supply technology, it obtains energy from a fixed grid and transports to theelectrical equipment with a contactless way. It comprehensive utilizes the high and newtechnology such as power electronic technology, electromagnetic inductive couplingtechnology, high-frequency convertor technology, etc. Comparing with the traditionalway of power supply, it not only has a good safety, high efficiency and it’s veryconvenient and efficient. Therefore it has attracted more and more attention.In addition, with the popularization and development of digital controlled circuit,power electronic equipment also gradually tends to be miniaturization, high frequencyand large capacity. Meanwhile, the electromagnetic environment becomes more andmore complex, the electromagnetic interference that comes along might be increasinglyserious. The electromagnetic interference, radiation and the leaked electromagneticwave generated by electronic equipment work, will have an effect on the normal workof the other electronic equipment, such as performance degradation, dysfunction,misoperation, etc. Therefore, for electromagnetic compatibility problem, we must payhighly attention to it.Comparing with the contactless inductive charging technology and wireless energytransmission technology of electromagnetic waves, the magnetic coupling resonantwireless energy transmission technology this topic researched has long transmissiondistance, high efficiency, a good orientation and no radiation, etc. But it also existselectromagnetic interference problems. Based on the wireless power transmissionsystem, the paper researched its main module circuit and analyzed its producedelectromagnetic interference and suppression method. Through the method ofcombining theoretical analysis, model establishment and simulation, it researched on the drive control module, high frequency inverter and rectifier filter module. First of all,it summarized the power supply technology development, the characteristics of wirelessenergy transmission and its accompanying EMC problems, defined the meaning of thisstudy. Second, expounded the mechanism and frequency characteristic of the magneticcoupling resonant wireless power transmission, as well as the electromagneticcompatibility standards and requirements. Then it analyzed the module circuit andelectromagnetic interference of the wireless energy transmission system in detail.Finally, according to the characteristics of the wireless energy transmission, on the basisof the electromagnetic compatibility theory, mainly explained the design of the drivingcontrol circuit and high frequency inverter circuit, and through the simulation analysisand calculation, theoretically proved the feasibility of the design, better solved theelectromagnetic interference problem in the process of wireless energy transmission, itmight has a certain guiding role for the wireless energy transmission system andelectromagnetic interference suppression.
|