高頻軟開關(guān)弧焊電源畢業(yè)論文

1、I摘要本文在分析了弧焊電源發(fā)展歷程和研究現(xiàn)狀以后，結(jié)合開關(guān)電源的基本原理，設(shè)計(jì)了輸出為300A的高頻軟開關(guān)弧焊電源。應(yīng)用全橋零電壓脈寬調(diào)制軟開關(guān)電路作為主電路拓?fù)湓O(shè)計(jì)了該變換器的主電路，實(shí)現(xiàn)對(duì)輸出電流的調(diào)節(jié)，解決了傳統(tǒng)弧焊電源開關(guān)損耗大、對(duì)電網(wǎng)造成污染較大等缺點(diǎn)。在該電路拓?fù)涞幕A(chǔ)上，基于UC3875的移相控制技術(shù)，根據(jù)焊接時(shí)所需的要求以及主電路對(duì)驅(qū)動(dòng)電路的要求設(shè)計(jì)了控制電路?？刂齐娐凡捎昧穗娏鏖]環(huán)PI調(diào)節(jié)系統(tǒng)，以滿足焊接時(shí)對(duì)電源特性方

2、面的需求。設(shè)計(jì)了輸入過欠壓、輸入過流保護(hù)電路、IGBT過熱以及IGBT的緩沖保護(hù)電路，解決了弧焊逆變器可靠性低的缺點(diǎn)。關(guān)鍵詞軟開關(guān)逆變電源UC3875移相控制III目錄摘要..............................................................IAbstract.........................................................II第一章緒

3、論.......................................................11.1逆變弧焊電源的特點(diǎn)...................................................................................11.2逆變弧焊電源的發(fā)展?fàn)顩r.....................................................

4、......................11.3本課題設(shè)計(jì)方案及研究目標(biāo).......................................................................4第2章主電路設(shè)計(jì).................................................52.1輸入整流濾波電路設(shè)計(jì).......................................

5、........................................62.1.1熔斷器的選擇.....................................................................................62.1.2濾波電路的設(shè)計(jì)......................................................................

6、...........72.1.3輸入整流管的選擇.............................................................................72.1.4輸入濾波電容.....................................................................................72.2移相控制ZVSPWMDCDC變換器

7、工作原理..........................................92.2.1主電路拓?fù)浞治?................................................................................92.2.2主電路拓?fù)鋃VS的實(shí)現(xiàn)...............................................................

8、...142.3逆變電路的設(shè)計(jì).........................................................................................162.3.1主功率管IGBT的容量計(jì)算............................................................162.3.2諧振電感的計(jì)算......................

9、.........................................................172.4高頻脈沖變壓器的設(shè)計(jì).............................................................................172.5輸出濾波電路的設(shè)計(jì).........................................................

10、........................222.5.1輸出整流二極管的選擇...................................................................222.5.2輸出濾波電感...................................................................................222.5.3輸出濾波電容的選擇

11、.......................................................................23第3章控制電路的設(shè)計(jì)............................................253.1移相控制芯片的設(shè)計(jì)...............................................................................

12、..263.1.1振蕩頻率的設(shè)定及同步...................................................................273.1.2死區(qū)的設(shè)置.......................................................................................273.2反饋電路的設(shè)計(jì).......................

13、..................................................................28第4章驅(qū)動(dòng)電路設(shè)計(jì)..............................................30第5章保護(hù)電路的設(shè)計(jì)............................................315.1過流保護(hù)電路的設(shè)計(jì)...........................

14、......................................................315.1.1輸入過流保護(hù)...................................................................................315.1.2IGBT過流保護(hù).......................................................