| With the advancement and development of science and technology,the related applications of wireless energy transmission technology have gradually appeared in people's field of vision.Resonant radio energy transmission,as an emerging branch of radio energy transmission,has become a hotspot of experts and scholars at our country and abroad in recent years due to its advantages of high transmission efficiency and long transmission distance.Many scholars have done in-depth research on the transmission structure,circuit topology and transmission characteristics of magnetic resonance type radio energy transmission.The high-frequency power supply is used as the power output front end of the magnetic resonance type wireless energy transmission system.The performance of the high-frequency power supply has a great influence on the overall transmission efficiency of the system.At this stage,research on this field is not very common.Therefore,to design a high-efficiency high-frequency power amplifier for a magnetic resonant radio energy transmission system has great practical significance.This paper summarizes the development of magnetic resonant radio energy transmission and high frequency power amplifier and the research status at home and abroad,introduces the types and technical indicators of power amplifiers,and learns the principles of circuit and analog electronic technology to improve efficiency.From the perspective,a Class E power amplifier with a center frequency of 800 kHz was designed.In the design stage,this paper divides the power amplifier into three parts: the drive circuit module,the active switch module and the load matching network.The selection of the switch tube,the selection of the gate drive resistor,the design of the drive circuit,the calculation of the circuit parameters,Load matching network design and other work.In order to achieve the high-frequency operation of the power amplifier,a MOSFET with fast switching response is selected as the active switching transistor of the power amplifier.By studying the turn-on and turn-off process of the MOSFET,a reasonable driving circuit is designed to operate the MOSFET in a low-loss high-speed switch.status.By designing a load matching network,the voltage waveforms across the drain and source of the MOSFET are controlled so that large voltages and large currents on the MOSFET do not occur at the same time.As much as possible,the conduction loss and the transition loss of the MOSFET are reduced,and the overall power amplifier is improved.After completing the design of the power amplifier,the PCB of the power amplifier was drawn using Altium Designer software,and the physical assembly and soldering were completed.On the built debug platform,the final gate resistance was determined by observing the waveform of the MOSFET gate voltage and comparing it with the theoretical waveform.At the same time,adjust the capacitance parameters in the load matching network so that the drain voltage waveform of the MOSFET is close to the ideal waveform.Subsequently,the performance of the power amplifier was tested.The results show that the power amplifier has a working frequency band of 550 kHz to 1 MHz,an output power of 6.91 W,and a maximum efficiency of 81.2%.Finally,the power amplifier is combined with a signal generator and a DC stabilized power supply to form a magnetic resonance radio energy transmission high-frequency power system,which is applied to a radio energy transmission system composed of a disk coil to transmit power and efficiency.The results show that the radio energy transmission system works well in the magnetic resonance state,the high-frequency power supply realizes the power supply to the system. |
PDF Full Text Request