基于PWM的血泵调速控制系统设计及检测  

Design and test of a speed control system for a blood pump based on PWM

作　　者：常宇[1] 师林溪[1] 高斌[1] 李玲[1] 马鑫蕊[1] 郝冬梅[1] 刘有军[1] 王存新[1] 

机构地区：[1]北京工业大学生命科学与生物工程学院,北京100022

出　　处：《北京生物医学工程》2008年第4期348-351,共4页Beijing Biomedical Engineering

基　　金：北京工业大学实践教学重点项目(015000514107);北京市科技新星计划(33015998200701);北京市教委项目(05015999200701)资助

摘　　要：目的设计基于ML4428的血泵PWM逆变器的双闭环调速控制器。利用最优PWM调法和针对ML4428调速电压受限的特点,考虑到在某些环境内可能达不到理想的调速范围这一因素,本文介绍了一种带有电压转换功能的PWM调速模块设计。方法模块使超出芯片调速范围的电压信号通过比较、编码,通过数字电子网络转换成为规定范围内的电压信号,实现血泵转速的PWM调制。基于此模块,分别在血泵控制电压恒定、入口压力恒定条件下,进行了一系列血泵转速检测试验。结果血泵可以在5～24V之间调整转速;额定工作控制状态下,即血泵入口压力固定在22mmHg、控制电压22V情况下,得到了血泵转数8000r/min,出口压力100mmHg,流量为5L/min的对应关系,测量结果可以满足初期设计的调速要求。Objective Pointing the blood pump based on an active magnetic bearing （AMB） system,this paper introduces a comparable optimized PWM MIA428 control chip,which provides all the functions necessary for controlling a blood pump. Methods Pointing to the dual-loop speed control system in the chip,which has a confined range of speedmodulate voltage,a speed-modulate design is introduced for the purpose of allowing off-range modulate voltages to work. This module serves a function that can transform the off-range modulate voltage into within-range modulate voltage through a digital electrical network as an AD converter to implement PWM. Results Based on this module, the rotation speed of blood pump can be controlled under the condition from 5V to 24V voltage and invariable inlet pressure respectively. With the inlet pressure of 22mmHg and control voltage of 22V, the rev of pump can be up to 8000 r/min, outlet pressure with 100mmHg,and flux with 5 L/min,whieh output meets the demand of initial expectation.

关 键 词：主动式磁悬浮血泵 ML4428 PWM调制 双闭环调速系统 调速设计 

分 类 号：R318.1[医药卫生—生物医学工程]