【正文】 ......................................................................3 系統(tǒng)組成 ...............................................................................................................3 系統(tǒng)的主要功能 ...................................................................................................3 DCDC 開關(guān)穩(wěn)壓電源模塊 .........................................................................4 電壓檢測(cè)模塊 ..............................................................................................5 電壓控制模塊 ..............................................................................................5 單片機(jī)小系統(tǒng) ..............................................................................................5 3. DCDC開關(guān)穩(wěn)壓電源模塊 的設(shè)計(jì) ............................................................................7 主要功能和指標(biāo) ...................................................................................................7 設(shè)計(jì)原理及電路圖 ...............................................................................................7 TL494 簡(jiǎn)介 ...........................................................................................................8 外圍電路設(shè)計(jì) .......................................................................................................9 紋波與效率 .........................................................................................................12 4. 電壓檢測(cè)模塊的硬件設(shè)計(jì) ........................................................................................14 主要功能和指標(biāo) .................................................................................................14 設(shè)計(jì)原理及電路圖 .............................................................................................14 TL431 簡(jiǎn)介 .........................................................................................................14 外圍電路設(shè)計(jì) .....................................................................................................15 5. 電壓控制模塊的硬件設(shè)計(jì) ........................................................................................16 主要功能和指標(biāo) .................................................................................................16 設(shè)計(jì)原理及電路圖 .............................................................................................16 子模塊設(shè)計(jì) .........................................................................................................16 第 2 頁 上海交通大學(xué) 電子信息與電氣工程學(xué)院 穩(wěn)壓子模塊 ................................................................................................16 整波子模塊 ................................................................................................17 濾波子模塊 ................................................................................................17 隔離子模塊 ................................................................................................18 電壓控制模塊元件參數(shù)一覽表 ................................................................20 重點(diǎn)問題的討論 [7]..............................................................................................21 低通濾波器的選擇 ....................................................................................21 光耦溫漂問題 ............................................................................................21 6. 單片機(jī)小系統(tǒng)及軟件設(shè)計(jì) ........................................................................................23 單片機(jī)小系統(tǒng) .....................................................................................................23 輸入輸出（ I/O）端口 ...............................................................................23 定時(shí)器 /計(jì)數(shù)器 ...........................................................................................23 A/D轉(zhuǎn)換 .....................................................................................................24 按鍵及數(shù)碼管顯示器 ................................................................................24 算法總體描述 ............................................................................................25 主程序模塊 .........................................................................................................27 功能描述 ....................................................................................................27 變量描述 ....................................................................................................27 算法描述 ....................................................................................................27 開環(huán)控制模塊 .....................................................................................................27 功能描述 ....................................................................................................27 變量描述 ....................................................................................................27 閉環(huán)控制模塊 .....................................................................................................29 模塊功能描述 ............................................................................................29 變量描述 ....................................................................................................29 7. 致謝 ............................................................................................................................30 8. 參考文獻(xiàn) ....................................................................................................................33 9. 附錄 A 系統(tǒng)操作說明書 ........................................................................................34 系統(tǒng) 功能 .............................................................................................................34 第 3 頁 上海交通大學(xué) 電子信息與電氣工程學(xué)院 性能指標(biāo) .............................................................................................................34 接線方式 .............................................................................................................34 系統(tǒng)按鍵說明 .........................................