Research And Design On The Emission System Of Magnetic Resonances Wireless Power Transmission

As one of the most concern of technology by the international community in twenty-firstCentury, the wireless power transmission has begun to enter people life. Because of thecharacteristics about energy efficient transmission in middle distance, wireless power transfertechnology via magnetic resonant coupling attracts a lot of researchers of research andexplore.This article mainly introduced the magnetic resonance coupling wireless powertransmission technology and design the emission module. This technique use the fundamentaltheories that the consistency between the inherent resonance frequency of transmitter coil andinherent resonant frequency of receiving coil will cause electromagnetic resonance and strongelectromagnetic coupling to realize the electrical power transmission. This technique mainlyused for middle distance wireless transmission power and has high efficiency.In order to realize the directional transmission of electricity, spiral coil are adopt duringthe process of designing transmitter coil which is usually used for directional transmissionsignal. According to the relationship between physical parameters of spiral coil (number ofturns, coil diameter, etc.) and electrical parameters (inductance, frequency, etc.), we designseveral groups of the spiral coils. The results of testing the electrical properties of the coilsindicate that the coil designed in this paper has good directivity.The paper designed the square wave generating circuit base on16MHz TCXO andSN74HC740D-trigger, which provides the control signal for class E power amplifier.In order to achieve the goal that transform power ac into power rf, this paper designed akind of voltage driver class E power amplifier. Compared with the traditional power amplifier,the efficiency of class E power amplifier is higher and can improve the transmissionefficiency of the entire launch module effectively.