【正文】 本科生畢業(yè)設(shè)計(jì)說(shuō)明書 論文題目： 基于單片機(jī)的正弦波逆變電源設(shè)計(jì) 年 月 日 I 摘要 本 次 設(shè)計(jì)是基于單片機(jī) STC 而設(shè)計(jì)的純正弦波逆變電源。額定輸入 U=12V 的直流電，輸出為 50Hz,220V 的交流電。額定輸出功率為 300W。設(shè)計(jì)了全方位的保護(hù)電路 。包含 了可以 根據(jù)溫度來(lái)控制散熱風(fēng)扇的開啟 。實(shí)現(xiàn)了 輸入低壓、過壓的關(guān)斷功能 。 當(dāng)輸入 U 過低時(shí)， 逆變現(xiàn)象停止 ， 這樣 可以防止蓄電池 的損壞。 當(dāng)輸入 U 過高時(shí)，停止 逆變，可以防止 損壞芯片。擁有輸入防反接功能，當(dāng)輸入正負(fù)極接錯(cuò)時(shí)， 關(guān)斷輸入與后級(jí)電路的連接， 不會(huì)燒壞芯片或蓄電池。采用了一個(gè)液晶屏來(lái)顯示輸出的電壓， 輸出 頻率等信息。 采用一對(duì)發(fā)光二極管來(lái)指示工作狀態(tài)。采用了一個(gè)蜂鳴器，當(dāng)產(chǎn)生錯(cuò)誤時(shí)，發(fā)出蜂鳴報(bào)警。 輸出的交流電為標(biāo)準(zhǔn)的正弦波，而不是方波或修正波，可以實(shí)現(xiàn)更寬范圍的帶負(fù)載能力。根據(jù) 實(shí)驗(yàn)分析 ， 最終 轉(zhuǎn)換效率 達(dá)到 85%以上，輸出 結(jié)果 穩(wěn)定，達(dá)到了理想 的實(shí)驗(yàn)效果。 關(guān)鍵詞 單片機(jī)，逆變電源，正弦波，反接保護(hù) Abstract The design is based on STC microcontroller designed for pure sine wave inverter. Rated input voltage of 12V DC, output is 50Hz, 220V AC. Rated output power of 300W. I designed a full range of protection circuits. It can be included to control the temperature on the cooling fan. Achieve a input voltage, overvoltage shutdown function. When the input voltage is too low, the inverter is stopped, to prevent damage to the battery, when the input voltage is too high, the inverter is stopped to prevent damage to the chip. Has the input antireverse function when the input is negative then the wrong time, and after the shutdown input stage circuit connections will not burn chips or batteries. It uses a liquid crystal screen to display the output voltage, output frequency and other information. It uses two light emitting diodes to indicate the operating status. It uses a buzzer when an error occurs, the alarm beeps. The standard AC output sine wave, rather than a square wave or modified wave, a wider range can be achieved with a load capacity. According to the test, the conversion efficiency of more than 85%, stable output, to achieve a good experimental result. Key Words MCU, Inverter, Sine wave, reverse polarity protection 目錄 摘要 ............................................................................................................................................ I ABSTRACT .............................................................................................................................II 第一章 緒論 ............................................................................................................................. 1 系統(tǒng)研究的背景 ............................................................................................................. 1 系統(tǒng)研 究的意義 ............................................................................................................. 2 第二章 系統(tǒng)的工作原理與結(jié)構(gòu) ............................................................................................. 3 系統(tǒng)的工作原理 ............................................................................................................. 3 系統(tǒng)的硬件結(jié)構(gòu) ............................................................................................................. 6 系統(tǒng)的軟件設(shè)計(jì) ............................................................................................................. 7 第三章 系統(tǒng)的硬件設(shè)計(jì) ......................................................................................................... 8 主控制器 ......................................................................................................................... 8 DCDC 模塊 .................................................................................................................... 9 PWM 脈沖產(chǎn)生電路 ................................................................................................ 9 變壓器的設(shè)計(jì) ........................................................................................................ 10 輸出整流電路的設(shè)計(jì) ............................................................................................ 12 DCAC 模塊 .................................................................................................................. 12 波驅(qū)動(dòng)隔離 ................................................................................................ 13 開關(guān)電路的設(shè)計(jì) .................................................................................................... 14 LC 濾波電路設(shè)計(jì) .................................................................................................. 15 保護(hù)模塊 ....................................................................................................................... 16 溫度保護(hù) ................................................................................................................ 16 輸入保護(hù) ................................................................................................................ 16 輸出保護(hù) ................................................................................................................ 17 直流 5V電路設(shè)計(jì) ........................................................................................................ 18 顯示與報(bào)警模 塊 ....................................................................................................... 18 液晶顯示 ................................................................................................................ 18 蜂鳴器報(bào)警 ............................................................................................................ 20 第四章 系統(tǒng)的軟件設(shè)計(jì) ....................................................................................................... 21 開發(fā)環(huán)境介紹 ............................................................................................................... 21 SPWM 程序設(shè)計(jì) ........................................................................................................... 23 液晶驅(qū)動(dòng)程序設(shè)計(jì) ....................................................................................................... 28 第五章 結(jié)束語(yǔ) ....................................................................................................................... 32 參考文獻(xiàn) ................................................................................................................