【正文】 d and display circuit of batching automatic control system ............. 38 I/O port expansion circuit.................................................................... 39 Keyboard design of the system ........................................................... 39 Display circuit design for the system .................................................. 41 The power system for the batching automatic control system ..................... 42 CHAPTER 4 The software design for the batching automatic control system .......... 44 The main stuctural design of the software design ......................................... 44 PI control subroutine design.......................................................................... 46 Interrupt service routine ................................................................................ 47 CHAPTER 4 Batching system DC speed control system simulation......................... 49 Construction of DC double closed loop speed control system simulation model .................................................................................................................. 49 Simulation results of the DC double closed loop speed control system ...... 50 The summary ............................................................................................................. 52 Acknowledgements ................................................................................................... 53 References ................................................................................................................. 54 Appendix 1 software programming ........................................................................... 56 Appendix 2 system hardware schematic .................................................................... 62 1 第 1 章 緒 論 引言 配料系統(tǒng)是按照一定比例來控制物料傳輸?shù)牧浚蛊鬏數(shù)奈锪习凑找欢ū壤齾㈦s在一起，在工業(yè)和農(nóng)業(yè)上有很大的用處。s livelihood. The cumulative control of some mixed materials batching is realized by batching scale. This accurate cumulative control can cut down the cost of manufacture, improve the quality of the product and enhance the efficiency of labor. The paper first has an introduction to the status of development for batching scale controller at home and abroad, and then ponents and operating principle of the batching scale. According to the design requirements for flow control of a batching scale, this paper designs a batching scale controller with AT89C52 single chip microputer as the master control chip. This paper analyzes the working principles of the system and some key technical issues of the application based on the IGBT apparatus, which include drive circuit, snubbed circuit, protection and controlling the quantity of heat, and so on. In the aspect of microputer control, it has discussed the principle of number touch off、 number velocity testing、current/velocity controller、 number PWM modulator and presents the hardware or software scheme to achieve it. Photoelectric encoder is used in this system to measure the speed of . motor. The result of the measurement is sent to A/D converter after passing the filtering circuit, and finally the feedback single is stored in the singlechip puter and participates in a PI calculation. By real time testing dandy adjusting the motor’s velocity/current, this timing system can get quick and exact timing result. Keywords reversible DC timing system PulseWidth Modulation number controller. IV 目 錄 摘 要 ............................................................ I ABSTRACT ........................................................ III 目 錄 ........................................................... IV CONTENTS ......................................................... VI 第 1 章 緒 論 ...................................................... 1 引言 ...................................................... 1 研究皮帶配料系統(tǒng)的意義 ..................................... 1 配料系統(tǒng)的國內(nèi)外發(fā)展現(xiàn)狀 ................................... 3 配料系統(tǒng)的發(fā)展趨勢 ......................................... 4 第 2 章 配料自動控制系統(tǒng)設(shè)計(jì) ....................................... 6 配料自動控制系統(tǒng)可控直流源的選擇 ........................... 6 配料自動控制系統(tǒng)可控直流源的方案比較 ................. 6 配料自動控制系統(tǒng)可控直流源的方案確定 ................. 8 直流調(diào)速系統(tǒng) PWM 電路方案設(shè)計(jì) ............................... 8 PWM 變換器控制方案選擇 ................................ 9 PWM 變換器的數(shù)學(xué)模型 ................................. 10 配料系統(tǒng)直流調(diào)速系統(tǒng)閉環(huán)系統(tǒng)方案 .......................... 10 配料系統(tǒng)自動控制系統(tǒng)的整體方案設(shè)計(jì) ........................ 12 配料系統(tǒng)直流調(diào)速系統(tǒng)設(shè)計(jì) .................................. 13 配料系統(tǒng)自動控制系統(tǒng)性能及技術(shù)要求 .................. 13 直流電機(jī)相關(guān)參數(shù)的計(jì)算 .............................. 14 雙閉環(huán)穩(wěn)態(tài)工作時(shí)靜特性 .............................. 16 電流調(diào)節(jié)器和轉(zhuǎn)速調(diào)節(jié)器的設(shè)計(jì) ........................ 17 第 3 章 配料系統(tǒng)自動控制系統(tǒng)硬件電路設(shè)計(jì) .......................... 22 重量信號采集電路 .......................................... 22 傳感器選擇 .......................................... 22 重量信號的采集電路 ................................... 23 重量信號濾波放大電路 ...................................... 24 A/D 轉(zhuǎn)換電路 .............................................. 26 配料系統(tǒng)自動控制系統(tǒng)的單片機(jī)系統(tǒng) .......................... 27 皮帶配料系統(tǒng)電機(jī)回路保護(hù)電路設(shè)計(jì) .......................... 29 啟動保護(hù)電路 ........................................ 29 V IGBT的選擇及其吸收回路設(shè)計(jì) .......................... 30 直流電機(jī)電流檢測電路 ...................................... 31 數(shù)字測速電路 ............................................. 32 M/T 法測速原理 ...................................... 33 數(shù)字測速硬件電路 .................................... 34 PWM 驅(qū)動電路設(shè)計(jì) .......................................... 36 PWM 信號產(chǎn)生電路 ..................................... 36 PWM 信號驅(qū)動電路 ..................................... 37 配料系統(tǒng)自動控制系統(tǒng)的鍵盤與顯示電路 ...................... 38 I/O 口擴(kuò)展電路 ...................................... 39 配料系統(tǒng)自動控制系統(tǒng)的鍵盤電路設(shè)計(jì) .................. 39 配料系統(tǒng)自動控制系統(tǒng)的顯示電路設(shè)計(jì) ................