發(fā)布時(shí)間：2018-03-12 23:12

  本文選題：DSP　切入點(diǎn)：超聲波電源　出處：《江南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：傳統(tǒng)的超聲波電源，特別是應(yīng)用于超聲波生物處理裝置上，通常是工作在一個(gè)固定的頻率、固定的功率上，這樣就大大降低了超聲波生物處理的效率。但是隨著超聲波換能器技術(shù)的不斷突破，以及應(yīng)用于工業(yè)控制的高性能DSP芯片的不斷出現(xiàn)，使得采用數(shù)字化控制的寬頻的超聲波電源的設(shè)計(jì)與研究變得可行，從而大大地提高了系統(tǒng)的集成化。 本文研究設(shè)計(jì)了基于DSP控制的寬頻超聲波電源，主要應(yīng)用于超聲生物處理系統(tǒng)。主控芯片選擇的是高性能的32位浮點(diǎn)型的DSP芯片F(xiàn)28335。依據(jù)生物處理液的濃度檢測(cè)，轉(zhuǎn)換為電信號(hào)，并送入DSP，與總控上位機(jī)通訊來(lái)確定最優(yōu)頻率，然后通過(guò)DSP來(lái)實(shí)現(xiàn)換能器負(fù)載端的切換，使得超聲波電源工作在最優(yōu)頻率，并通過(guò)采集負(fù)載端電流電壓來(lái)實(shí)現(xiàn)頻率跟蹤。超聲波換能器采用的是寬頻率的超聲波振子陣，通過(guò)對(duì)超聲波振子陣的實(shí)時(shí)參數(shù)進(jìn)行測(cè)量，計(jì)算出其調(diào)諧匹配的匹配電感和阻抗匹配的匹配變壓器的變比。在電源設(shè)計(jì)方面，通過(guò)DC/DC、DC/AC兩級(jí)電路調(diào)節(jié)實(shí)現(xiàn)了寬范圍的變頻變壓的功能，從而實(shí)現(xiàn)寬頻輸出，功率可調(diào)的超聲波電源的設(shè)計(jì)。前級(jí)DC/DC采用的是Buck開關(guān)電源，通過(guò)矩陣鍵盤給定電壓到DSP，通過(guò)DSP來(lái)實(shí)現(xiàn)PWM占空比的可變輸出，從而控制開關(guān)管的通斷，實(shí)現(xiàn)母線電壓的調(diào)節(jié)。后級(jí)DC/AC采用的是單相全橋逆變電路，在頻率自動(dòng)跟蹤系統(tǒng)的設(shè)計(jì)方面，采用的是基于DSP的FUZZY-DDS控制，利用FUZZY控制進(jìn)行頻率的粗調(diào)，并且利用DDS芯片AD9833進(jìn)行頻率的精調(diào)，從而實(shí)現(xiàn)頻率自動(dòng)跟蹤系統(tǒng)的精確控制。 本文對(duì)整個(gè)寬頻超聲波電源進(jìn)行了方案設(shè)計(jì)，并詳細(xì)介紹了主要硬件電路的實(shí)現(xiàn)，，包括整流濾波模塊、Buck調(diào)壓模塊、逆變模塊、采樣電路、驅(qū)動(dòng)電路等。設(shè)計(jì)了DSP的最小系統(tǒng)，介紹了EPWM模塊的具體工作原理，并給出了系統(tǒng)的軟件流程圖。
[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.
【學(xué)位授予單位】：江南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN86

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