Magnetic Coupled Resonance Mine Explosion-proof Power Research And Design

In our country,coal is dominant in primary energy.In the process of coal mining,a large number of explosion-proof will be used.Present stage,the mine explosion-proof power's metal conductor is directly connected to the underground transmission lines,at the connect moment,spark discharge is easy produced,the transformer within the power is composed of large inductance,arc discharge safe hidden trouble may be produced.What's more,the power is inconvenient operated when faults occurred.In order to solve these problems,a mine explosion-proof power which uses the magnetic coupled resonance wireless power transfer technology is designed in this paper.Due to avoid direct contact with the metal conductor and omit the transformer in design,the probability of spark and arc discharge can be significantly reduced.Firstly,this article analysis the electricity transfer principles of magnetic coupled resonance mine explosion-proof power from the angle of electric?magne.The SS and the SP structure circuit model are established based on the theory of mutual inductance coupling circuit.The theory expressions of transfer power and transfer efficiency are deduced.The impacts of coupling coefficient and load on the transfer power and transfer efficiency are elaborated.The OrCAD and MATLAB are used to simulate and analyze the various influential factors.Through the theory and simulation,we can conclude: When the load is constant,it has optimum coupling coefficient to get the maximum transfer power and has high transfer efficiency.When the coupling coefficient is constant,it has matched load to get the maximum transfer power and transfer efficiency,but the two matched load are different.Combining the application scenarios of mine explosion-proof power,this theory select the SS structure circuit model.In the entirety design of the magnetic coupled resonance mine explosion-proof power electricity transfer,firstly,contrasting the characteristics and application scenarios of the whole-bridge inverter circuit and power amplifier,and combining the high resonance frequency and small transfer power characteristics of the mine explosion-proof power,this article uses the power amplifier as the part of high frequency excitation.Secondly,the transmitter and receiver resonance coils are optimum produced.Finally the experimental platform of magnetic coupled resonance mine explosion-proof power electricity transfer is set up.In order to determine the transfer distance of 3 mm,this paper studies the effect of transfer distance on the transfer power and the transfer efficiency.This paper studies the effect of load on the transfer power and the transfer efficiency.The experimental results show that the transfer characteristics of SS structure circuit model are not ideal.To improve the transfer characteristics,this paper puts forword the improved SS structure circuit model.Contrasting analysis of the SS structure circuit model and the improved SS structure circuit model,the transfer characteristics of improved SS structure circuit model are better and more resilient to load.At the end of this article,the magnetic coupled resonance mine explosion-proof power is applied to the main roadway in mine,determining the resonant frequency is 5 MHz,the two resonant coils transfer distance is 3 mm,the load is 500 ?,through the experiment research we can conclude that the transfer power is 15.42 W and the transfer efficiency is 84.8%.