| Electric energy plays a decisive role in human life.From the discovery of electricity hundreds of years ago and the gradual use of electricity,to the development of tens of thousands of lights today,the glory of the night,we are more and more inseparable from electricity,and more and more enjoy the convenience that electricity brings to our lives.For a long time,the transmission of electrical energy was considered to be able to be transmitted and tran smitted only through wired methods such as cables and wires.However,in some relatively closed and narrow environments,the conditions for wired transmission of power,such as line cables,cannot be met.Conventional wired transmission methods are likely to cause unnecessary damage and loss to people or equipment.With the rapid development of semiconductor devices and microwave technology in recent years,microwave radio energy transmission technology has become more and more mature.Therefore,the effective transmission of electrical energy by wireless has become the optimal choice in a specific environment.This article aims at the situation of the above specific environment,and based on microwave,semiconductor devices and other technologies,design an d research of microwave radio energy transmission system.The system consists of a voltage-controlled oscillator,a phase-locked loop circuit,a power amplifier,and a microstrip antenna.The front-end transmitter section converts DC power to RF microwave power sources as stable as possible.At the receiving end,the array microstrip antenna is used to efficiently absorb microwave energy,and then the microwave energy is converted into gentle DC energy suitable for the load through the rectifier circuit,fi lter circuit and voltage stabilizing circuit,and then output to the load for utilization.According to China's radio frequency division regulations,2.45 GHz and 5.8GHz are allocated to industrial,scientific and medical use,so these two frequencies are not in the communication band and will not conflict with the communication system,so this system chooses the more common 2.45 GHz Microwave as the main frequency.In the specific design link,the VCO and PLL are integrated through the ADF4118 chip to make the transmitter performance more efficient,and the frequency synthesized and output to the power amplifier module is stable at 2.45 GHz.The power amplifier selects a class C power amplifier with higher efficiency and is more commonly used,so that the gain reaches 20 d B,and is verified through simulation by Multisim software.During antenna simulation,Ansoft HFSS software is used to simulate the antennas of the transmitter and receiver of the system.The optimal size is determined by the S parameter and the Simth circle,and the maximum gain is determined by the 3D radiation gain map.Both the transmitting and receiving antennas are in the form of an array.The transmitting end uses a 2×4 array rectangular microstrip antenna,and the receiving end uses a 2×2 array rectangular microstrip antenna.The rectifier filter circuit adopts the Schottky barrier diode of model MA4E1317 for high-efficiency rectification,and the filter capacitor is 20 u F.The voltage regulator module at the receiving end adopts the Buck-boost voltage regulator circuit to stabilize the voltage at 6V.Finally,each module of the system is built,and the experimental analysis is carried out in a safe experimental environment.The voltage and current values of the load at the receiving end at different distances are measured by a multimeter,and the received power is calculated.The experimental results show that the system meets the corresponding technical requirements,thus confirming the correctness of the low-power wireless energy transmission system and having corresponding application value. |
PDF Full Text Request