DSP控制的薄膜微阀组集成微流体驱动系统设计

Design and implementation of the integrated microfluidic driving system based on DSP

提出了一种基于TMS320F28335DSP控制的微流控芯片气动微泵流体驱动系统,在Unger等制作的气动微泵基础上,将经典的六相控制方式简化为三相控制;在用气路致动频率控制微流道中流体流速的基础上,将气路开启占空比作为可能影响微流体流速的因素进行研究。DSP接收LabVIEW程序发送的参数后,产生相应的ePWM波形输出,驱动电磁阀驱动电路控制电磁阀状态,实现对微流控芯片上气路状态的控制,利用气路周期性地传递压力波,进而实现弹性薄膜的顺序形变,最终实现对流道内流体流速控制。针对500μm的微流体管道,可在8Hz致动频率下实现0~4μL/min的可调流速;驱动占空比为40%~65%时,可获得较好的流速平台。

Microfluidic chip driving microfluid control system is designed,based on TMS320F28335 DSP.LabVIEW application is applied to send the signals to DSP to generate corresponding ePWM waveform,which is used to derive solenoid driver circuit.Solenoid driver circuit is used to control gas line on microfluidic chip,sequential denection of elastic membranes is achieved by periodic pressure waveforms traveling through pneumatic channel,and eventually to control fluid flow inside the flow channel.The classic six-phase control is simplified to three-phase control,by introducing the Unger＇s Pneumatic micropump.On the basis of the frequency as a pneumatic actuator control fluid flow in microfluidic channels,researched the gas line turn-on duty cycle as a parameter that may affect the microfluidic flow rate.Microfluidic conduit which width is 500μm can be achieved 0-4μL/min adjustable flow rate under 8Hz;at the same time when the driving duty ratio of 40%-65%,preferably at a platform obtained better flow velocity.