回(hui)想自己剛(gang)開(kai)始做電源(yuan)學習階段(duan)，Buck、Boost、Flyback、半(ban)橋(qiao)、移相全(quan)橋(qiao)、LLC一大堆(dui)。從迷茫(mang)，艱(jian)難(nan)中，一步步走出來(lai)。在電源適配(pei)器(qi)廠家做了五年了，各種拓撲，各種功率，基本上玩過一(yi)遍了。今天做為(wei)過來人，和大(da)家分享一(yi)些自己的經(jing)驗。

做電源工程師(shi)，這些東西是必須要(yao)掌(zhang)握的

1、單(dan)相交流電。

2、單相交流電整流。

3、三相交流電。

4、三相(xiang)交流(liu)電整(zheng)流(liu)。

5、電(dian)容(rong)。

電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)的(de)分類：電(dian)(dian)(dian)解(jie)(jie)電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)，最(zui)(zui)常用(yong)的(de)整流濾波電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)。電(dian)(dian)(dian)解(jie)(jie)電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)分極性(xing)(xing)，極性(xing)(xing)接反(fan)了，電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)發生化學反(fan)應，就短路炸掉(diao)了。電(dian)(dian)(dian)解(jie)(jie)電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)的(de)主(zhu)要(yao)參數：耐壓，容(rong)(rong)(rong)(rong)值，等效電(dian)(dian)(dian)阻（esr），工作溫度(du)，使用(yong)壽命，外(wai)觀(guan)尺寸(cun)。瓷片電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)，金屬(shu)膜電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)，這(zhe)些(xie)電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)不分極性(xing)(xing)，ESR小(xiao)，一般做(zuo)高頻旁路用(yong)的(de)，因為電(dian)(dian)(dian)解(jie)(jie)電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)ESR比(bi)較大，通(tong)常在(zai)電(dian)(dian)(dian)解(jie)(jie)電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)旁邊并聯ESR小(xiao)的(de)高頻電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)。Y電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)，各(ge)種(zhong)標準需(xu)要(yao)的(de)。（自己(ji)百(bai)度(du)）。關于電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)，在(zai)分析電(dian)(dian)(dian)路時(shi)候，有一條最(zui)(zui)重要(yao)的(de)我必(bi)(bi)須(xu)強調：電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)充電(dian)(dian)(dian)，電(dian)(dian)(dian)流必(bi)(bi)須(xu)由(you)電(dian)(dian)(dian)源正極，通(tong)過電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)，流向電(dian)(dian)(dian)源負極；電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)放電(dian)(dian)(dian)：電(dian)(dian)(dian)流必(bi)(bi)須(xu)由(you)電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)正端，通(tong)過外(wai)部(bu)回路，回到電(dian)(dian)(dian)容(rong)(rong)(rong)(rong)負端。

6、電(dian)感。

開關電(dian)源里面電(dian)桿就分兩大類，一(yi)類是(shi)(shi)儲能用(yong)的，一(yi)類是(shi)(shi)做濾波器用(yong)的，就這兩類。

7、變壓器(qi)。

開關(guan)電源里面的(de)變壓(ya)器(qi)(qi)指的(de)就是(shi)變壓(ya)器(qi)(qi)，跟(gen)工頻變壓(ya)器(qi)(qi)的(de)工作原理一(yi)樣。（Flyback，LLC變壓(ya)器(qi)(qi)，這(zhe)個(ge)嚴格意(yi)義上(shang)，不是(shi)變壓(ya)器(qi)(qi)，這(zhe)倆是(shi)耦合電感）。

8、磁芯。

必須知道(dao)的：什么是磁芯截面積(ji)Ae,什么是窗口面積(ji)Aw，什么是B-H曲線，這(zhe)個必須懂的。

9、銅線。

必(bi)須知(zhi)道(dao)什么是穿透深度(du)，什么是電(dian)流密度(du)。為什么要用(yong)三層絕緣線，為什么要打擋墻。

假如你在電源(yuan)(yuan)適配器廠家工作，作為(wei)一個(ge)剛入行的電源(yuan)(yuan)工程師，可(ke)以完全搞明白上面(mian)列舉(ju)的一些基本概念(nian)，那你完全就可(ke)以做一個(ge)合格(ge)的助(zhu)工了(le)，歡迎你加入電源(yuan)(yuan)行業。