基于DSP的宽频超声波电源的研究

发布时间：2018-03-12 23:12

本文选题：DSP　切入点：超声波电源　出处：《江南大学》2014年硕士论文　论文类型：学位论文

【摘要】：传统的超声波电源，特别是应用于超声波生物处理装置上，通常是工作在一个固定的频率、固定的功率上，这样就大大降低了超声波生物处理的效率。但是随着超声波换能器技术的不断突破，以及应用于工业控制的高性能DSP芯片的不断出现，使得采用数字化控制的宽频的超声波电源的设计与研究变得可行，从而大大地提高了系统的集成化。本文研究设计了基于DSP控制的宽频超声波电源，主要应用于超声生物处理系统。主控芯片选择的是高性能的32位浮点型的DSP芯片F28335。依据生物处理液的浓度检测，转换为电信号，并送入DSP，与总控上位机通讯来确定最优频率，然后通过DSP来实现换能器负载端的切换，使得超声波电源工作在最优频率，并通过采集负载端电流电压来实现频率跟踪。超声波换能器采用的是宽频率的超声波振子阵，通过对超声波振子阵的实时参数进行测量，计算出其调谐匹配的匹配电感和阻抗匹配的匹配变压器的变比。在电源设计方面，通过DC/DC、DC/AC两级电路调节实现了宽范围的变频变压的功能，从而实现宽频输出，功率可调的超声波电源的设计。前级DC/DC采用的是Buck开关电源，通过矩阵键盘给定电压到DSP，通过DSP来实现PWM占空比的可变输出，从而控制开关管的通断，实现母线电压的调节。后级DC/AC采用的是单相全桥逆变电路，在频率自动跟踪系统的设计方面，采用的是基于DSP的FUZZY-DDS控制，利用FUZZY控制进行频率的粗调，并且利用DDS芯片AD9833进行频率的精调，从而实现频率自动跟踪系统的精确控制。本文对整个宽频超声波电源进行了方案设计，并详细介绍了主要硬件电路的实现，，包括整流滤波模块、Buck调压模块、逆变模块、采样电路、驱动电路等。设计了DSP的最小系统，介绍了EPWM模块的具体工作原理，并给出了系统的软件流程图。
[Abstract]:The traditional ultrasonic power supply, especially used in ultrasonic biological treatment devices, usually works at a fixed frequency, a fixed power, This greatly reduces the efficiency of ultrasonic biological processing. But with the breakthrough of ultrasonic transducer technology and the continuous emergence of high-performance DSP chips used in industrial control, It makes the design and research of broadband ultrasonic power supply with digital control feasible and greatly improves the integration of the system. This paper studies and designs a broadband ultrasonic power supply based on DSP control, which is mainly used in ultrasonic biological processing system. The main control chip is a high performance 32-bit floating-point DSP chip F28335.According to the concentration detection of biological treatment solution, It is converted into electrical signal and sent into DSP to determine the optimal frequency by communicating with the host computer of the master control. Then the switching of the load end of the transducer is realized through DSP, which makes the ultrasonic power supply work at the optimal frequency. The ultrasonic transducer uses a wide-frequency ultrasonic oscillator array, and the real-time parameters of the ultrasonic oscillator array are measured by measuring the real-time parameters of the ultrasonic oscillator array. In the aspect of power supply design, the function of wide frequency conversion and voltage change is realized by adjusting the DC / DC / DC / AC two-stage circuit, so that the wide frequency output can be realized, so as to calculate the variable ratio of the matching inductance and the matching transformer with the impedance matching, so as to realize the wide frequency output by adjusting the DC / DC / DC / AC two-stage circuit. The design of ultrasonic power supply with adjustable power. The former stage DC/DC uses Buck switch power supply, through matrix keyboard to give voltage to DSP, through DSP to realize the variable output of PWM duty cycle, thus controlling the switch switch on and off. In the design of the frequency automatic tracking system, the FUZZY-DDS control based on DSP is adopted, and the frequency coarse tuning is carried out by FUZZY control, which is used to control the voltage of the bus bus, and the single-phase full-bridge inverter circuit is used in the later stage DC/AC, and in the design of the frequency automatic tracking system, the FUZZY-DDS control based on DSP is adopted. DDS chip AD9833 is used to fine tune the frequency, thus the accurate control of the frequency automatic tracking system is realized. This paper designs the whole broadband ultrasonic power supply, and introduces the realization of the main hardware circuit in detail, including rectifier filter module, inverter module, sampling circuit, driving circuit, etc. The minimum system of DSP is designed. The working principle of EPWM module is introduced, and the software flow chart of the system is given.
【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】：TN86

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