干扰电治疗仪的模拟电路实现  

Realization of the Interferential Current Therapeutic Instrument Based on Analog Circuitry

作　　者：董铭祥 申庆丰 苏建坡[1] 马凤英[1] 

机构地区：[1]郑州大学物理工程学院,河南郑州450001 [2]翔宇医疗设备有限责任公司,河南安阳456300

出　　处：《自动化仪表》2016年第2期86-88,94,共4页Process Automation Instrumentation

摘　　要：针对当前干扰电治疗仪普遍存在功能单一、成本较高的问题,提出了一种基于模拟电路的系统方案。系统以Atmega128为主控制器,设计了干扰电系统的硬件电路和软件程序。利用直接数字频率合成(DDS)芯片AD9835生成调制波;利用单片机自带的脉冲宽度调制(PWM)产生载波;利用数字电位器实现调制度的控制,最终输出两路调制频率、调制度和差频频率独立可调的干扰电治疗波形。临床试验证明该治疗仪工作稳定,治疗效果良好。To against the shortcomings of existing interferential current therapeutic instruments,e. g.,unitary functions and higher cost,etc.,the system scheme based on analog circuitry is proposed. In the system,Atmegal 128 is used as the main controller; the hardware circuits and software program of the interferential current system are designed. The modulation wave is generated by adopting direct digital frequency synthesis（ DDS） chip AD9835; while the carrier is produced by the single chip computer built- in pulse width modulation（ PWM）,the control of modulation index is implemented by using digital potentiometer. Finally,two of the interferential current therapeutic waveforms are output of which the modulation frequency,modulation degree and offset frequency are adjustable independently. The clinical trials verify that the therapeutic instrument features stable operation and excellent therapeutic effects.

关 键 词：电治疗仪 模拟电路 数字电位器 调制信号 频率 人机交互 载波 滤波器 

分 类 号：TH789[机械工程—仪器科学与技术]