Design of pH Control System for Electrodialysis Water Treatment

电渗析技术以其独特优势,在水处理、食品和化工等领域有着广泛的应用。针对电渗析水处理系统出水酸碱度可调的应用需求,利用STM32F407RET6单片机开发了一套基于PID算法的pH值控制系统,运用PWM方式完成了电渗析电源电压的快速控制,实现电渗析水处理系统出水pH值的快速调节,调节时间小于30s。所述酸碱度控制系统的开发,有助于提升水处理系统的响应速度,提高水质监控水平。To meet the requirement of adjustable water pH for electrodialysis water treatment system,a pH value control system based on PID algorithm is developed using STM32F407RET6 microcontraller.Then to realize rapid water pH adjust- ment of the electrodialysis water treatment system,the PWM method is utilized for fast control of the electrodialysis power supply voltage,which makes the adjusting time less than 30s.The development of pH value control system contributes to im- proving the response speed of the water treatment system.国家自然科学基金（51405408）; 厦门南方海洋研究中心项目（15GHS019HJ03）; 厦门市科技计划项目（3502Z20163005）; 福建省中青年教师教育科研项目（JAT160002

Design and Experimental Study on Alternating Current Electrospinning Source

静电纺丝技术采用直流高压电源产生静电场诱导导电溶液喷射，基于静电纺丝技术的射流喷印已经成为微纳系统集成制造的重要方法，尤其在有机、柔性器件制造中具有很大的应用潜力。本文针对交流诱导电纺射流喷印需求，设计了正弦高压交流电源，并通过在静电纺丝设备喷头与收集基底之间加载正弦交流电压，验证了该电源用于交流电纺的效果，并初步探究了交流诱导电纺射流喷印的规律。 根据交流电纺需求，设计了正弦高压交流电源，通过原理分析及参数计算，设计了推挽式直流变换电路、SPWM逆变电路以及控制电路等。通过制作调试，直流变换部分当PWM控制信号占空比为0.379时，输出电压稳定在397V；不同负载下，输出误差在1V以内，纹...Electrospinning technology uses DC high-voltage power source which generates electrostatic field to induce conductive solution injecting. Jet printing which is based on electrospinning technology has become an important method of integrated manufacturing of micro-nano systems, especially in the organic, flexible device system manufacturing, and it shows huge potential of application. In this paper...学位：工学硕士院系专业：航空航天学院_机械电子工程学号：1992014115287