毕业设计论文(基于51单片机数控直流电源的设计).doc

51/STC89C52DAC0832LM317ADC0832 MCUDACADCBased on the 51 microcontrollernumerical DCpower supply designAuthorLiu Xuezhi MajorElectronic information technologyTeacherHuang Lin TitleAssociate ProfessorAbstractThe method of this paper based on the 51 microcontroller core of the numericalcontroller DC power supply design theory and realization. The power supply has somefunctions such as presetting voltage, stepping adjustment, displaying the output voltagesignals and current signals at the same time. This paper introduces a general designing plan ofthe system, which is mainly consisted of micro-controller module, DC Regulators module,voltage/current sampling module, display module, keyboard module, power supply module.The system is based on the principle of single-chip microcomputer to control the unitSTC89C52 to DAC0832 digital-to-analog converter chip reference voltage to control theoutput voltage LM317 output voltage conversion module size, while the output voltageregulator, current use of analog-to-digital converter ADC0832 chip sampling of voltage andcurrent converted to digital signals, and then through the single-chip closed-loop control toachieve. Article on the main DC power supply CNC performance parameters were measuredand summarized, and their development prospects.Keywords microcontroller (MCU)the Digital to Analog (DAC)the Analog toDigital (ADC)the closed-loop control511. 11.111.211.321.432.32.1 32.2(MCU) 52.3160262.482.5OP07 92.6 102.7 113. 123.1 123.2 133.2.1133.2.2143.2.3153.2.4183.2.5193.2.6203.3 204. 214.1 214.2 214.2.1 214.2.2 235. 245.1 245.1.1 245.1.2 245.1.3 255.2 266. 27 29 30131232511.1.1,:()(),220V1.2 90/180/,N+151Sorensen Amrel120KW32647600kW20%-30%1.3 1DAC23:15V:1A2:0.1V:0.02V1.4,5151/2.2.1115V1A20.1V34LCD515123PWMPWM3PWMPWM()PWMD/AD/A,2-1 2-151P0DAC0832DAOP075LM33170.1VMCU10.1V0.1V3MCUDALM3174D/AD/A51(8051)(24C02)(LM317)51/A/D/LCD1602/2-22-22.2(MCU)2.2.1 STC89C52STC89C5288K64KBRAM512B64KB48/P0P1P2P351(89C52)(24C02)LCD(LM317)/4032/I/O2316,22STC89C52FlashFlash58xc522-3 STC89C522.2.2XTAL119XTAL21812MHzRST/Vpd9VCC40VSS20+5VP0P3I/OP03239N1N113IR1011I2CN1SDAS18SCLS19122728CPU512.3 16022.3.1 LCD1602LCD1602LCD32,.,62-4 LCD16021:16X2.2:4.5-5.5V32MA(5.0V).45V5:2.95X4.35(WXH)mm6,.2.3.22-1 LCD16021VSS2VDD3VL4RS/H/L5R/W/H/L6E7D0Data 1/078D1Data 1/09D2Data 1/010D3Data 1/011D4Data 1/012D5Data 1/013D6Data 1/014D7Data 1/015BLA16BLK2.4LM317LM3171. 2V37V1. 5A LM317511. 2V1. 0A0.01%0.1%80dB1. 25V37VLM317LM317301. 5-32V.1. 5A.LM317.,(200),(K).8LM3172-5 LM317LM317Vout=1.25V(1+R2/R1)+IAdjR2IAdj100uAIAdjR2Vout=1.25V(1+R2/R1)2.5OP07OP072-6 OP075192.5.110.35 VP-P (0.1Hz10Hz)210 V30.2 V/ 40.2 V/MO5 1nA6126dB714V8 3V 22V9725108A741AD5102.5.2OP072.6D/ADAC0832CMOS8/2-6TR-2RVREFDAC0832102-7 DAC0832D0D751ILECSWR11XFERWR22IOUT1IOUT2DACRfbVref- 1010VVcc+5+15VAGNDNGNDAGND2.72.7.1 A/DADC0832ADC08328IO ADADC08324/CSCLKDODIDODI/CS3DIDODI