Design And Implementation Of Long Distance Infrared Wireless Energy Transmission System

Generally,wired power transfer transmits power through media such as metal wires or cables.The traditional wiring method used for wired power transfer will inevitably lead to difficulties in fault detection.There are difficulties in detecting fault,increasing the maintenance cost of the power supply system.Even if the development of materials science and the advancement of manufacturing have prolonged the service life of cables,the maintenance cost of cables is always an unavoidable expense.Moreover,the traditional wired power transfer network also faces the challenge of difficult business expansion.Undoubtedly,the special geographical environment such as mountains and ports also makes the laying of power lines numerous obstacles.Wireless power transfer increases the freedom of power supply methods and expands people’s imagination on power transmission methods.This thesis proposes a wireless power transfer method that is highly motility and less restrictive,that is,a wireless power transfer method that uses laser with a wavelength of 1064 nm as the transmission medium.This wireless power transfer method is different from conventional laser wireless power transfer.The method proposed in this thesis places the laser resonator output mirror on the receiving end.When an object is placed on the transceiver connection,the laser transmission is interrupted.The method proposed in this thesis is more secure compared to the conventional method.In addition,this thesis also designed a receiver for collecting laser energy.The receiver has the functions of beam expansion and automatic impedance matching,which greatly improves the efficiency of energy collection.This thesis mainly includes the following contents:Firstly,this thesis investigates the researches of wireless power transfer technology at home and abroad,focusing on the long-distance wireless power transfer technology based on laser transfer.Secondly,this thesis studies the basic theory of long-distance infrared wireless power transfer,introduces the existing wireless power transfer technology,and elaborates the key technologies used in the wireless power transfer system designed in this thesis.The key work of this thesis is to design a long-distance wireless power transmission system based on 1064nm laser.The system consists of transmitter and receiver.The transmitter is mainly composed of resonator input mirror,gain medium and pump source.The receiver is mainly composed of beam expander,resonator output mirror,photovoltaic module,buck converter,pulse width modulated wave generator and maximum power tracking module.The main function of the transmitter is to generate 1064nm laser.The distance between the two resonator mirrors is the distance of laser energy transmission,and the function of the beam expander is to expand the spot radius of the output laser,so as to improve the efficiency of laser energy collection.The photovoltaic module realizes the photoelectric conversion,and the buck converter not only realizes the buck,but also provides the control entrance for the feedback network.The feedback network is composed of pulse width modulated wave generator and maximum power tracking module.The function of the feedback circuit network is to realize automatic impedance matching,so as to give full play to the maximum potential of photovoltaic module photoelectric conversion.The buck converter circuit designed in this thesis incorporates a capacitor into the input of the traditional buck converter circuit.The simulation results show that this improvement reduces the waste of energy and improves the output power of the system.In addition,this thesis also analyzes the influence of the input capacitance on the time efficiency of the system.In this thesis,the automatic impedance matching performance of the feedback network is analyzed by simulation when the load is terminated with different impedances under the illumination intensity of 1000W/m~2and 1390W/m~2.