摘要
针对超声驱动电源系统工作易失谐,传统信号发生方式频率易漂移、精度低等问题,提出一种基于DDS的超声理疗仪驱动电源设计。驱动电源系统以STM32单片机为主控平台,利用DDS信号发生器产生超声激励信号,经功率放大器处理后,实现驱动信号的高稳定和高精度。驱动电源系统后端采用串联匹配电路进行阻抗匹配,并利用锁相环技术进行超声驱动信号的频率跟踪。经过实验测试表明,该系统具有输出功率稳定、输出驱动信号频率自动调整、工作安全等特点。
In allusion to the problems that the driving power supply system is easy to detuned,the frequency of the traditional signal generation mode is easy to drifting,and the precision is low,a DDS-based driving power supply design of ultrasonic physiotherapy instrument is proposed. In the driving power supply system,the STM32 single-chip is used as the master control platform,and DDS signal generator is used to generate ultrasonic excitation signal,which is processed by the power amplification to realize the high stability and high precision of driving signal. The series matching circuit is applied to the back end of the driving power system for the impedance matching,and the phase-locked loop technology is used for the frequency tracking of ultrasonic driving signal. The experimental results show that the ultrasonic driving power system has the features of stable output power,automatic frequency adjustment of output driving signal,safe operation and so on.
作者
庞宇
袁鹏飞
阳妙
PANG Yu;YUAN Pengfei;YANG Miao(Chongqing Key Laboratory of Optoelectronic Information Sensing and Transmission Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)
出处
《现代电子技术》
北大核心
2020年第10期18-20,24,共4页
Modern Electronics Technique
基金
国家自然科学基金(61671091)。
关键词
超声驱动电源
系统设计
信号处理
阻抗匹配
频率跟踪
系统测试
ultrasonic driving power supply
system design
signal processing
impedance matching
frequency tracking
system testing
