The Piezoeletric Drive Circuit System Apllicated In Flapping Wing Micro Aerial Viecle

With the development of bionics,aerodynamics theories,MEMS(Micro Electro Mechanical Systems)manufacturing and artificial intelligence,FWMAV(Flapping-Wing Micro Aerial Vehicle)shows high application value and broad prospects for development in both the military field and the business field.FWMAV can finish a lot of tasks such as detecting,monitoring and information communicating that human beings cannot.The power system is an important part of the FWMAV.The parameters of power system,such as stability,power,efficiency and so on,will have a great influence on the behavior of FWMAV.Therefore,the study of the power system is very necessary.In this thesis,the piezoelectric drive circuit system is designed to match FWMAV which is driven by piezoelectric actuator.The specific work as follows:Firstly,from the perspective of actuator and drive circuit,the recent researches on FWMAV are introduced.The piezoelectric drive method is studied and compared with the other drive methods.The advantages and disadvantages of piezoelectric drive method are summarized.The requirements of piezoelectric drive method are proposed;Secondly,according to the requirements of piezoelectric drive method,the piezoelectric drive circuit system is designed at the conceptual level and divided into four modules: boost module,inverter module,inverter drive module,and center control module.And the function goals of each module are proposed;Thirdly,according to the functional goals of each module,in the hardware aspect,the optimal circuit structure scheme is chosen and modified in the analysis of schemes.To some degree,the adding of tapped inductor and energy recovery inductor in the drive circuit system can solve the problems that step-up ratio is low and the circuit components are frequently destroyed by the unexpected peak current.In the software aspect,this thesis tries adding the PID control,look-up table control and dead zone control in the feedback program based on the STM32 chip;Fourthly,the design and simulation of each module are carried out independently.And then the modules are combined to be manufactured,tested and optimized;after the success of module combination tests,the complete piezoelectric drive circuit system including all four modules is manufactured,tested,adjusted and optimized according to the experiment results.The three-dimension structure of the PCB design reduces probabilities that the drive circuit suffer from EMI(Electro-magnetic Interference)and the damage because of the high voltage.The utilization of the circuit board area,the circuit performance and efficiency are up to the standards;Finally,the electric parameters and equivalent circuit model parameters of piezoelectric actuators are tested.And the test platform of piezoelectric drive circuit system is built to test the circuit performance parameters and indexes,the load capacity of piezoelectric drive circuit system and the displacement of piezoelectric actuator which provides the mechanical energy to FWMAV;The piezoelectric drive circuit system is designed in this thesis.In the case of 5V input,the step-up ratio is up to 60,and the highest efficiency is 83%.It can generate output waves: square and sinusoidal waves,and the waveform parameters(amplitude,duty cycle and frequency)can be adjusted.The piezoelectric drive circuit system can drive the piezoelectric actuator of FWMAV.The maximum amplitude of the piezoelectric actuator is 437?m.This thesis provides a theoretical and experimental basis for the development of integrated miniature piezoelectric drive circuit for the FWMAV.