大功率高频超声波生物处理系统的控制研究

发布时间：2018-05-04 19:25

本文选题：超声波电源 + 模糊控制器　；参考：《江南大学》2014年硕士论文

【摘要】：随着生物处理技术的不断发展，对其处理效率要求越来越高，将超声技术应用到生物处理方面，可有效的提高处理的效率，因此超声波电源的研究就显得至关重要，尤其是提高工作效率和智能化方面。本文主要对超声波电源频率跟踪和功率调节进行研究，在频率自动跟踪方面，采用Fuzzy-DPLL的复合频率跟踪方式，当频率误差较大时，采用模糊控制器进行调节，使误差值减小，再采用数字锁相环（DPLL）调节，实现频率的自动跟踪；而在功率调节方面，对Buck变换器采用电压电流双闭环控制策略，，同时采用带死区的积分分离式PID算法，来调节PWM的占空比。并且用Matlab中的Simulink开发环境和模糊逻辑工具箱对频率跟踪方法、功率调节方法进行建模仿真，并对仿真结果进行分析验证。本文以30kHz/2kw的超声波电源为设计对象，对系统各个部分方案设计进行对比和选取。对主电路中功率器件的具体参数进行设计及选型，主要包括整流桥、Buck变换器、逆变器、高频变压器、匹配电感、驱动电路等；控制电路是以TMS320F2812为核心的控制电路，主要包括电源电路、时钟电路、接口电路等；采样电路是用互感器采集换能器两端的电压、电流信号，送入DSP中实现频率的跟踪和功率调节。为了保证电源能安全可靠的工作，还设计了保护电路如过压保护、过流保护、过热保护。最后，设计了DSP的最小系统、主电路与驱动电路，并制成PCB板，搭建实验样机进行相关的实验验证，电源工作稳定，测量实验输出波形和数据，结果验证了设计的合理性与可靠性。
[Abstract]:With the development of biological treatment technology, the efficiency of ultrasonic treatment is becoming more and more high. The application of ultrasonic technology to biological treatment can effectively improve the efficiency of treatment, so the research of ultrasonic power supply is very important. Especially in improving work efficiency and intelligence. In this paper, the frequency tracking and power regulation of ultrasonic power supply are studied. In frequency automatic tracking, the compound frequency tracking method of Fuzzy-DPLL is adopted. When the frequency error is large, the fuzzy controller is used to adjust the error value. Then the digital phase-locked loop (DPLL) is adopted to realize the automatic tracking of the frequency, and in the aspect of power regulation, the voltage and current double closed loop control strategy is adopted for the Buck converter, and the integral separated PID algorithm with dead time is used to adjust the duty cycle of the PWM. The Simulink development environment in Matlab and the fuzzy logic toolbox are used to model and simulate the frequency tracking method and the power regulation method, and the simulation results are analyzed and verified. In this paper, the ultrasonic power supply of 30kHz/2kw is taken as the design object, and the design of each part of the system is compared and selected. The specific parameters of power devices in the main circuit are designed and selected, including rectifier bridge Buck converter, inverter, high frequency transformer, matching inductor, driving circuit, etc. The control circuit is a control circuit with TMS320F2812 as the core. The sampling circuit uses the transformer to collect the voltage and current signals at the two ends of the transducer and to realize the frequency tracking and power regulation in the DSP. In order to ensure the safe and reliable operation of the power supply, protection circuits such as overvoltage protection, overcurrent protection and overheating protection are also designed. Finally, the minimum system of DSP, the main circuit and driving circuit are designed, and the PCB board is made, and the experimental prototype is built to verify the experiment. The power supply is stable, and the experimental output waveform and data are measured. The results verify the rationality and reliability of the design.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB559;TP273

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