一种新型的程控多频雾化电路设计方案
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摘要
针对传统雾化电路中驱动信号频率不易调整、电路调试困难等问题,设计了一种由程序控制的多频率、多电路的新型雾化电路。电路采用STM32为主控制器,通过基于AD9833编程的频率合成器生成频率可调的外接驱动信号,驱动MOS管的开关功能来控制外接信号的输入,激励振荡器振荡。利用采样反馈电路寻找最佳谐振频率,从而提高雾化电路的稳定性,实现了频率的实时调整,精简了电路结构,降低了调试难度。
Aiming at the problems of difficult adjustment of resonant frequency and difficult debugging in traditional atomizing circuit, a new atomizing circuit with multi-frequency and multi-circuit controlled by program is designed. The circuit uses STM32 as the main controller, and generates a frequency-adjustable external driving signal by frequency synthesizer based on AD9833 programming. The switching function of the MOS tube is driven to control the input of the external signal, so as to excite the oscillator oscillation. Sampling feedback circuit is used to find the optimum resonant frequency, which improves the stability of atomization circuit, realizes the real-time frequency adjustment, simplifies the circuit structure and reduces the difficulty of debugging.
Aiming at the problems of difficult adjustment of resonant frequency and difficult debugging in traditional atomizing circuit, a new atomizing circuit with multi-frequency and multi-circuit controlled by program is designed. The circuit uses STM32 as the main controller, and generates a frequency-adjustable external driving signal by frequency synthesizer based on AD9833 programming. The switching function of the MOS tube is driven to control the input of the external signal, so as to excite the oscillator oscillation. Sampling feedback circuit is used to find the optimum resonant frequency, which improves the stability of atomization circuit, realizes the real-time frequency adjustment, simplifies the circuit structure and reduces the difficulty of debugging.
引文
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[6]杨伟,肖义平.基于STM32F103C8T6单片机的LCD显示系统设计[J].微型机与应用,2014,33(20):29-31,34.
[7]蒋佳男,马忠松.具有小步进和低相噪的频率合成器的设计[J].现代电子技术,2018,41(16):9-12.
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[10]亢凯,阎渊海,胡泽民,等.基于DDS技术的杂散抑制和正弦信号源的实现[J].电子技术应用,2017,43(12):9-12.
[2]SHIFLETT M B,FOLEY H C.Ultrasonic deposition of high-selectivity nanoporous carbon membranes[J]Science,1999,285(5435):1902.
[3]HUANG C S,CHEN J S,LEE C H.Nebulized spray deposition of PLT thin film[J].Journal of Materials Science,1999,34(4):727-733.
[4]黄晖,姚熹,汪敏强,等.超声雾化系统的雾化性能测试[J].压电与声光,2004(1):62-64.
[5]甘云华,金龙,王心坚,等.超声波电机自激振荡驱动电路的变频控制特性[J].中国电机工程学报,2008(9):93-97
[6]杨伟,肖义平.基于STM32F103C8T6单片机的LCD显示系统设计[J].微型机与应用,2014,33(20):29-31,34.
[7]蒋佳男,马忠松.具有小步进和低相噪的频率合成器的设计[J].现代电子技术,2018,41(16):9-12.
[8]刘改琴,胡南.应用STM32和DDS的便携式简谐振动合成演示频率合成器[J].重庆理工大学学报(自然科学),2015,29(10):127-131.
[9]姜平,周根荣,王海军.基于AD9833的SPWM波形硬件生成方法[J].仪表技术与传感器,2007(10):56-57,61.
[10]亢凯,阎渊海,胡泽民,等.基于DDS技术的杂散抑制和正弦信号源的实现[J].电子技术应用,2017,43(12):9-12.