| People’s daily use of electronic products(such as mobile phones,cameras,MP3,etc.),without exception,need to charge.The traditional charging method uses wire charging,and usually an electronic product is equipped with a charger,so that each family has a number of battery charger;At the same time,the wire charge must be kept in the electronic equipment dedicated charging interface,and each charge directly pluging the charger is easy to cause electric sparks,interface damage and other issues.Contactless inductive charging is no contact between the charger and the electronic products to be filled,no spark,no need to worry about contact durability,bad contact,and as a result of the short circuit due to water leakage phenomenon.Contactless inductive charging technology as the research object will bring good social meaning.The main contents of this paper are as follows:Firstly,in this paper,a loosely coupled transformer is designed in accordance with the Qi standard,and its coupling capacity depends on the K value of the coupling coefficient.Using Maxwell software builds loosely coupled transformer simulation model,and analysis of the effects of the distance between the coil turn number,coil diameter,coil spacing,coil offset,shielding body shape,thickness and the shield body and coil is about the coupling coefficient K.Secondly,the mutual inductance model of loosely coupled transformer of resonant compensation,theoretical analysis of 8 kinds of primary and secondary resonant compensation circuit,a compensation capacitor is pushed to the formula by comparing the load power,choose the most suitable compensation method of this system,we can optimize the circuit performance,high transmission efficiency of the system.Finally,using Simulink software to build simulation circuit and simulated the main circuit of the system,the simulation waveform of output system,image intuitively display the relationship between voltage and current,finally through the theory research and simulation analysis to verify the output voltage and output current is in line with the requirements of the design. |
