【正文】 技大學(xué)本科畢業(yè)設(shè)計(jì) II Abstract With the continuous development of the society, the puter almost has bee very ordinary household electrical appliances. And with the popularization of the puter, the development of puters is also developing rapidly, and the various functions and performance increase at a very fast rate. Motherboard is the biggest piece of circuit boards in puter, it plays an important role. However the CPU is an indispensable part of the motherboard, the CPU just like a matchbox, but it is the operation core and control core of a puter. All the operation of a puter are controlled by CPU, which is responsible for reading mands， decoding mands and executing the core ponents of mands. In puter operation, the CPU heat is very important. Its thermal performance has a direct relationship to the CPU power consumption and the performance. Along with the development of nanometer technology, traditional cooling slice threepin cooling fans already cannot satisfy our demand. With pulse width modulation (PWM) technical intelligence adjustment CPU FAN speed, make the CPU temperature rises and fan speed increases in a certain range of a linear relationship, this not only can reduce power consumption but also lowered CPU temperature. Compared with the traditional CPU FAN, intelligent fan can maximum extent realize stepless speed and reduce energy losses and noise. This paper is the discussion based on the pulse width modulation technology CPU FAN control and adjustment. Key words: Temperature of CPU； CPU FAN； PWM 武漢科技大學(xué)本科畢業(yè)設(shè)計(jì) III 目 錄 1 緒論 ...................................................................................................................................... 1 CPU 散熱技術(shù)發(fā)展動(dòng)態(tài) ........................................................................................... 1 傳統(tǒng)的 CPU 散熱存在的問題 .................................................................................. 2 脈寬調(diào)制技術(shù)（ PWM）在 CPU 散熱中的應(yīng)用 .................................................... 2 2 計(jì)算機(jī)主板概述 .................................................................................................................. 3 計(jì)算機(jī)主板的組成 .................................................................................................... 3 中央處理器（ CPU）簡介 ........................................................................................ 4 中央處理器 (CPU)的功能 ................................................................................ 4 溫度對(duì) CPU 的影響 ........................................................................................ 5 3 CPU FAN 的組成及特點(diǎn) .................................................................................................... 8 CPU FAN 概述 .......................................................................................................... 8 CPU FAN 組成及工作原理 ...................................................................................... 9 CPU FAN 電機(jī) ................................................................................................ 9 霍爾傳感器 .................................................................................................... 10 4 脈寬調(diào)制技術(shù)（ PWM）概述 .......................................................................................... 13 脈寬調(diào)制技術(shù)（ PWM）的由來與發(fā)展 ................................................................ 13 脈寬調(diào)制技術(shù) (PWM)的基本思想及工作原理 ...................................................... 14 脈寬調(diào)制技術(shù)（ PWM）的優(yōu)點(diǎn) ............................................................................ 17 5 脈寬調(diào)制技術(shù)控制 CPU FAN 的基本思想 ..................................................................... 19 PWM 風(fēng)扇接口技術(shù) ............................................................................................... 19 PWM 溫控風(fēng)扇原理 ............................................................................................... 21 6 CPU 溫度控制系統(tǒng)的設(shè)計(jì) ............................................................................................... 24 控制系統(tǒng)芯片介紹 .................................................................................................. 24 BIOS 芯片 ...................................................................................................... 24 SUPER I/O 芯片 ............................................................................................ 26 LB11961 芯片 ................................................................................................ 29 CPU 溫度調(diào)節(jié)系統(tǒng)總體設(shè)計(jì) ................................................................................. 31 武漢科技大學(xué)本科畢業(yè)設(shè)計(jì) IV CPU 溫度監(jiān)測(cè)電路設(shè)計(jì) ............................................................................... 32 MB 溫度監(jiān)測(cè)電路設(shè)計(jì) ................................................................................. 33 主板 CPU FAN 控制電路的設(shè)計(jì) ................................................................. 33 CHA FAN 控制電路的設(shè)計(jì) .......................................................................... 34 電平轉(zhuǎn)換電路的設(shè)計(jì) .................................................................................... 35 CPU FAN 內(nèi)部控制電路的設(shè)計(jì) .................................................................. 36 參數(shù)測(cè)量與計(jì)算 ...................................................................................................... 37 7 總結(jié)及展望 ........................................................................................................................ 44 參考文獻(xiàn) .................................................................................................................................. 45 致 謝 ...................................................................................................................................... 46 附 錄 ........................................................................................................................................ 47 武漢科技大學(xué)本科畢業(yè)設(shè)計(jì) 1 1 緒論 CPU散熱技術(shù) 發(fā)展