Research On Driving Method Of Piezoelectric Micro-pump Based On Microfluidic Control System

With its development,microfluidic technology is showing its great advantages and wide application prospects.There are mature applications in the field of biology and chemical medicine.As the power element of microfluidic control system,micropump is an important symbol to measure the development level of microelectronic mechanical system and microfluidic control system.In particular,the application of precision medicine treatment in biological engineering and medicine has promoted the development of microfluidic control system.Micro pump is the core element in many applications,like accurate dosing,diabetes treatment of surgery anesthesia by insulin pump subcutaneously implanted timing in the process of drug delivery,targeted therapy drug delivery capsule in the digestive tract and medical integrated Microsystems combination drug delivery,etc.In addition,in the field of biological and chemical analysis,as well as some special industrial production and new products,micro-pump plays a vital role in driving the core.Piezoelectric pump is one of the main research fields of micro fluid pump.It has the advantages of small volume,high energy density,high flow resolution and convenient digital control.The output flow of piezoelectric micropump is determined by the structure of micropump,the characteristics of piezoelectric vibrators and the driving signals.Under the conditions of mechanical structure and material properties,the driving signal of piezoelectric vibrator determines the reliability and stability of micropump output microflow.Although a large number of researches have been carried out on micro-pump from principle theory to structural design,there is less research on micro-pump actuation.The current commercial micropump is mostly one part of a larger device which uses a common control system and no dedicated controller makes it an independent and complete work system.When the micropump structure has been determined,the performance and reliability can be further improved through better driving mode.Therefore,the main content of this paper is to design a small intelligent driving system to meet the new requirements of micro-pump development.Its main contents include:(1)Analyze and deduce the calculation formula of the flexural variation of the piezoelectric vibrator.Optimize the flow and pressure calculation method of micro-pump,and get the actual flow calculation formula.The piezoelectric vibrators are simulated by finite element analysis software.(2)The influence of different driving signals on piezoelectric vibrators in dynamic conditions is analyzed,and the mapping relation between different waveforms and micropump flows is derived.The experimental platform is set up to verify the theory and the control formula is set.The experimental platform is set up to verify the theory and the control formula is set.(3)A piezoelectric micro-pump drive system was designed.Draw electrical schematic diagram and design and draw the circuit board.The software control logic of the drive system is designed,and the control algorithm and the functions of each program are written.(4)The driving system was simulated and tested.The control effect and accuracy are verified.