Design Of Non-contact Power Transmission Device Of Low-power

Unlike traditional contact power transmission, non-contact power transmissiontechnology uses the electromagnetic induction principle of loosely coupled transformer,realizes the wireless transmission of electric power by using air as the transmission medium.Due to it overcomes the disadvantages exist in traditional way of power transmission such asthe spark of contact, and it can be widely used in all kinds of bad environment in powersupply, such as inflammable, explosive and underwater etc. The safety and reliability ofpower transmission can be effectively improved.Firstly, the development situation of domestic and foreign about the non-contact powertransmission technology is introduced in this paper, and the structure and working principle ofthe non-contact power transmission device are analyzed. It emphatically discusses the looselycoupled transformer, high frequency inverter, RCC voltage, capacitance compensation, overpressure and over current protection and related technologies, and settles the theory basis forthe design of subsequent low-power contactless power transmission. Secondly, combined withthe request of small power contactless power transfer, it designs the loosely coupledtransformer, specific completed the design of the loosely coupled transformer windingmagnetic core optimization, the analysis of the loosely coupled transformer wingding wayand the calculate of the loosely coupled transformer related parameters. The main circuit andcontrol circuit of the small power contactless power transmission device are designed onceagain. In order to improve the transmission efficiency of the system, selected the appropriateoutput voltage frequency, designed the voltage bridge type high frequency inverter circuit, atthe same time, introduced the SP capacitance compensation circuit at the both side of theloosely coupled transformer, it reduced the system reactive power wastage, improved thecoupling coefficient, in consider of the output voltage fluctuations, used the secondary voltagefeedback circuit to improve the stability of the system output voltage. Finally, the small powercontactless power transmission device is tested in power and efficiency with the situation ofload and no-load. Through the results of the test, the low power contactless power transferdevice has advantages of stable output voltage, high transmission efficiency and so on. Itmeets the requirements of the design.