本文選題：數(shù)控電源 + STC89C52��； 參考：《西安科技大學》2017年碩士論文

【摘要】：隨著科技的快速發(fā)展,越來越多的人們都在研究開關(guān)穩(wěn)壓電源。數(shù)控開關(guān)電源具有智能化程度高、準確性好、操作方便、穩(wěn)定性高、轉(zhuǎn)換效率高和輸出調(diào)節(jié)靈活等特點,取代傳統(tǒng)模擬電源是未來的發(fā)展趨勢。因此,對應(yīng)用于精密場合的數(shù)控電源研究具有重要工程應(yīng)用價值。通過對數(shù)控開關(guān)穩(wěn)壓電源的各模塊方案進行比較分析,得出其總體設(shè)計方案。該數(shù)控穩(wěn)壓電源由輔助電源電路、最小單片機系統(tǒng)、數(shù)模轉(zhuǎn)換模塊、按鍵電路模塊、數(shù)碼管顯示模塊以及穩(wěn)壓輸出電路構(gòu)成。對控制電路各模塊的硬件電路進行設(shè)計,對于供電電源模塊的相關(guān)器件選擇進行了具體分析及計算。對Boost變換器的電路元件參數(shù)進行設(shè)計,主要包括儲能電感、輸出電壓取樣電阻、開關(guān)管、輸出二極管、輸出電容、補償網(wǎng)絡(luò)、斜坡補償和保護電路等的設(shè)計,對功率場效應(yīng)晶體管MOSFET的選擇進行研究。利用匯編語言,對主程序和相關(guān)子程序進行編程,主要包括鍵盤掃描子程序、預(yù)設(shè)值子程序、D/A轉(zhuǎn)換子程序、A/D轉(zhuǎn)換子程序、校準子程序、上位機通訊子程序。通過軟硬件聯(lián)合調(diào)試,得到一款以STC89C52為主控芯片的數(shù)控穩(wěn)壓電源。利用單片機編程控制輸出的數(shù)字信號,通過了 DA0832 (D/A轉(zhuǎn)換器)的轉(zhuǎn)換,使得輸出為模擬量,此后,通過運放來進行放大,此電壓作為脈寬調(diào)制器的基準電壓,其輸出電壓隨著預(yù)置值的變化而變化。利用鍵盤可以對所設(shè)計的開關(guān)電源的輸出電壓進行設(shè)置,設(shè)置達到了 0. 1V的步進等級,實際的輸出電壓值可由數(shù)碼管進行顯示。設(shè)計中的單片機還可以實時監(jiān)控開關(guān)電源,將輸出電壓進行模數(shù)轉(zhuǎn)換,可以把模擬量實時地轉(zhuǎn)化為數(shù)字量,得到的數(shù)字量通過單片機處理,最終送至數(shù)碼管顯示。實現(xiàn)過程中考慮了誤差校正、故障自診斷、過流過壓保護等功能,具有較高的實用性。結(jié)合所得到的參數(shù)設(shè)計方法,研制了數(shù)控電源樣機,進行軟硬件聯(lián)合調(diào)試,實驗結(jié)果表明,本系統(tǒng)輸出電壓穩(wěn)定、負載調(diào)整率好、環(huán)境適應(yīng)性強、輸出電壓可在12V～18V范圍內(nèi)任意設(shè)定,達到了輸出可調(diào)的電壓精度,具有實時顯示功能,基本達到設(shè)計要求。
[Abstract]:With the rapid development of science and technology, more and more people are studying switching power supply.The CNC switching power supply has the characteristics of high intelligence, good accuracy, convenient operation, high stability, high conversion efficiency and flexible output regulation. It is the future development trend to replace the traditional analog power supply.Therefore, it has important engineering application value to the research of NC power supply used in precision occasions.Through the comparison and analysis of each module scheme of the NC switch voltage stabilizer power supply, the overall design scheme is obtained.The power supply is composed of auxiliary power supply circuit, minimum single-chip microcomputer system, digital-to-analog conversion module, key circuit module, digital tube display module and steady voltage output circuit.The hardware circuit of each module of the control circuit is designed, and the selection of the relevant devices of the power supply module is analyzed and calculated in detail.The circuit component parameters of Boost converter are designed, including the design of energy storage inductance, output voltage sampling resistance, switch tube, output diode, output capacitance, compensation network, ramp compensation and protection circuit, etc.The selection of power field effect transistor (MOSFET) is studied.The main program and related subroutine are programmed by assembly language, including keyboard scanning subroutine, preset subroutine D / A conversion subroutine, calibration subroutine and host computer communication subroutine.Through the joint debugging of software and hardware, a digital controlled power supply with STC89C52 as the main control chip is obtained.The output digital signal is programmed to control the output digital signal by single chip microcomputer. The output is converted by DA0832 / D / A converter. The output is analogue. Thereafter, the output is amplified by an operational amplifier. The voltage is used as the reference voltage of the pulse width modulator.The output voltage varies with the preset value.The output voltage of the designed switching power supply can be set by using the keyboard.1 V step level, the actual output voltage can be displayed by the digital tube.The single chip microcomputer can also monitor the switching power supply in real time and convert the output voltage into digital data in real time. The obtained digital quantity can be processed by single chip microcomputer and finally sent to the digital tube for display.The functions of error correction, fault self-diagnosis and overcurrent overvoltage protection are considered in the process.Combined with the parameter design method, the NC power supply prototype is developed and debugged by hardware and software. The experimental results show that the output voltage of the system is stable, the load adjustment rate is good, and the environment adaptability is strong.The output voltage can be set arbitrarily in the range of 12V~18V, and the output voltage precision can be adjusted. The output voltage can be displayed in real time and can basically meet the design requirements.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN86

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