Design And Research Of 13.56 MHz Wireless Power Transfer System Via Coupled Magnetic Resonances

As one of the most concern of technology in twenty-first Century,along with the development of technology,the wireless power transmission has begun to come true and enter people's life.As a new development trend,wireless power transfer via coupled magnetic resonances has more merits:delivering higher power at longer ranges and with more efficiency,non-radiative,penetrability.This thesis discusses an original analysis and design methodology for 13.56 MHz wireless power transfer via coupled magnetic resonances system.This thesis expounds the history of wireless power transfer,introduces six kinds of wireless power transfer technology,study the research and development status at home and abroad of wireless power transfer via coupled magnetic resonances.Establishes system analysis model based on coupled mode theory and circuit theory,we can get that the transmission performance is interacted by the coupling coefficient,loss coefficient,number of windings,the quality factor,resonance frequency,and how they influence each other,which provides the theoretical foundation for the overall system design.On the basis of theoretical analysis and simulation,the thesis details the selection and design of the 13.56 MHz electromagnetic resonant coupling wireless power transmission system,including the three main parts:transmitter circuit,coupled system and the receive circuit.First,introduces the designing idea of the antenna coil,analysis the coil structure and compensation network model,the resonant capacitance selection principle and calculation method are given,based on the theoretical of magnetic flux analysis the two methods of coil antenna: the optimal parameters calculation on theoretical and Wheeler formula on engineering applications.apply the two modules of ANSYS: Maxwell and Simplorer to co-simulation the antenna coil's magnetic and circuit,Explore the integration analysis method of the system on the electric field and magnetic field.Then,in view of the high-frequency wireless energy transmission system and a high quality factor coil for high frequency accuracy and stability requirements of high-frequency power has taken the autonomous power amplifier design ideas,after comparative analysis of the various signal generation scheme using MAX038 signal generator as the source,in order to avoid multi-stage amplification power consumption and noise prior to adding a power amplifier small-signal amplifier,power amplifier module is designed based on BLF175 amplifier chip as a typical class E power amplifier.Finally,based on the analysis of various rectifier,filter characteristics and frequency rectifier diode mode selected,the rectifier filter circuit was designed,in the rectifier circuit a impedance matching network are designed as an example for the importance of the impedance matching network,In order to adapt to different load requirements design an output adjustable DC—DC module.The joint debugging achieved the expected effect of wireless energy transmission,the correctness of the design method is verified.