【正文】 ircuit to inverter. Calculate the relevant parameters of high frequency transformer. Use Ir2110 to drive the MOSFET chopper circuit. MCU control part uses 80C51. MCU shows the feedback voltage. In order to achieve humanputer exchange the design through the keyboard to setting the output voltage. MCU will set the value transmitted to the PWM controller. IN order to control the output voltage. The design uses the PWM controller to control the MOSFET chopper circuit. The PWM controller is TL494. The control strategy is used by the PID algorithm. KEYWORDS: TL494。 Switching power supply。 MOSFET chopper circuit. 安徽工程大學(xué)畢業(yè)設(shè)計 1 目錄 第 1章緒論 ............................................................... 4 開關(guān)電源工作原理 .................................................. 4 開關(guān)電源的組成 .................................................... 5 開關(guān)電源的特點 .................................................... 5 開關(guān)電源發(fā)展方向 .................................................. 5 第 2章 系統(tǒng)的總體設(shè)計 .................................................... 7 方案論證 .......................................................... 7 主體思路 .......................................................... 8 軟件設(shè)計思路 ..................................................... 10 第 3章 系統(tǒng)硬件設(shè)計 ..................................................... 11 隔離式高頻開關(guān)電源 ............................................... 11 輸入電路設(shè)計 ..................................................... 11 功率變換電路設(shè)計 ................................................. 13 MOSFET 及其驅(qū)動 ............................................ 18 ..................................................... 23 PWM控制電路 ..................................................... 26 ................................................... 30 第 4章 軟件設(shè)計 ......................................................... 34 ..................................................... 34 ................................................. 34 數(shù)碼顯示子程序 ................................................... 35 ................................................... 36 ................................................. 37 PID控制算法 ..................................................... 38 ......................................................... 38 參考文獻(xiàn) ................................................................ 40 結(jié)論與展望 .............................................................. 41 致 謝 .................................................................. 42 附錄 1電氣原理圖 ........................................................ 44 附錄 2外文文獻(xiàn)及譯文 .................................................... 48 附錄 3參考文獻(xiàn)摘要 ...................................................... 54 附錄 4部分程序代碼 ...................................................... 56 汪強(qiáng)：基于單片機(jī)的開關(guān)電源設(shè)計 2 插圖清單 圖 11 開關(guān)電源的工作原理 ................................................................................................................. 4 圖 21 開關(guān)電源的一般框圖 ................................................................................................................. 7 圖 22 非隔離式 DCDC 結(jié)構(gòu) ............................................................................................................... 7 圖 23 隔離式 DCDC 結(jié)構(gòu) ................................................................................................................... 8 圖 24 系統(tǒng)總框圖 ................................................................................................................................. 9 圖 31 開關(guān)電源的基本功能框圖 ........................................................................................................11 圖 32 輸入電路原理圖 ........................................................................................................................11 圖 33 熱敏電阻的溫度系數(shù) ............................................................................................................... 13 圖 34 典型的全橋推挽式隔離變換器電路結(jié)構(gòu) ............................................................................... 14 圖 35 推挽式開關(guān)變壓器電源各主要工作點的電壓、電流波形 .................................................... 14 圖 36 典型的 MOSFET 曲線 ............................................................................................................. 19 圖 37 2110 驅(qū)動電路 .......................................................................................................................... 20 圖 38 IR2110 的內(nèi)部結(jié)構(gòu) .................................................................................................................. 21 圖 39 用于驅(qū)動板橋的電路 ............................................................................................................... 21 圖 310 產(chǎn)生共態(tài)導(dǎo)通現(xiàn)像兩只功率輸出的波形 ............................................................................. 23 圖 311 PWM 簡單的 LC 濾波網(wǎng)絡(luò) .................................................................................................... 23 圖 312 Vin 和 Vout 波形圖 ................................................................................................................. 24 圖 313 Vout 與占空比 D 的關(guān)系 ........................................................................................................ 24 圖 314 電壓反饋回路及 PWM 的響應(yīng)波形 ...................................................................................... 26 圖 315TL494 內(nèi)部原理圖 .................................................................................................................. 27 圖 316 TL494 輸出波形圖 ................................................................................................................. 28 圖 317 單端輸出和推挽輸出連接方式 ............................................................................................. 29 圖 318 誤差放大器和電流檢測放大器連接圖 ................................................................................ 29 圖 319 ADC0832 管腳圖 ...............................................................