数控开关稳压源研究与制作

发布时间：2018-04-13 18:50

本文选题：数控电源 + STC89C52　；参考：《西安科技大学》2017年硕士论文

【摘要】：随着科技的快速发展,越来越多的人们都在研究开关稳压电源。数控开关电源具有智能化程度高、准确性好、操作方便、稳定性高、转换效率高和输出调节灵活等特点,取代传统模拟电源是未来的发展趋势。因此,对应用于精密场合的数控电源研究具有重要工程应用价值。通过对数控开关稳压电源的各模块方案进行比较分析,得出其总体设计方案。该数控稳压电源由辅助电源电路、最小单片机系统、数模转换模块、按键电路模块、数码管显示模块以及稳压输出电路构成。对控制电路各模块的硬件电路进行设计,对于供电电源模块的相关器件选择进行了具体分析及计算。对Boost变换器的电路元件参数进行设计,主要包括储能电感、输出电压取样电阻、开关管、输出二极管、输出电容、补偿网络、斜坡补偿和保护电路等的设计,对功率场效应晶体管MOSFET的选择进行研究。利用汇编语言,对主程序和相关子程序进行编程,主要包括键盘扫描子程序、预设值子程序、D/A转换子程序、A/D转换子程序、校准子程序、上位机通讯子程序。通过软硬件联合调试,得到一款以STC89C52为主控芯片的数控稳压电源。利用单片机编程控制输出的数字信号,通过了 DA0832 (D/A转换器)的转换,使得输出为模拟量,此后,通过运放来进行放大,此电压作为脉宽调制器的基准电压,其输出电压随着预置值的变化而变化。利用键盘可以对所设计的开关电源的输出电压进行设置,设置达到了 0. 1V的步进等级,实际的输出电压值可由数码管进行显示。设计中的单片机还可以实时监控开关电源,将输出电压进行模数转换,可以把模拟量实时地转化为数字量,得到的数字量通过单片机处理,最终送至数码管显示。实现过程中考虑了误差校正、故障自诊断、过流过压保护等功能,具有较高的实用性。结合所得到的参数设计方法,研制了数控电源样机,进行软硬件联合调试,实验结果表明,本系统输出电压稳定、负载调整率好、环境适应性强、输出电压可在12V～18V范围内任意设定,达到了输出可调的电压精度,具有实时显示功能,基本达到设计要求。
[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.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN86

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