GE模塊IC697ACC64424VDC fan trayforSeries90-70 or RX7i short racks.

GE模塊IC697ACC64424VDC fan trayforSeries90-70 or RX7i short racks.

AC/DC變換是將交流變換為直流,其功率流向可以是雙向的,功率流由電源流向負(fù)載的稱為整流,功率

流由負(fù)載返回電源的稱為有源逆變。ACDC變換器輸入為50/60Hz的交流電,因必須經(jīng)整流、濾波,因

此體積相對較大的濾波電容器是的,同時因遇到安全標(biāo)準(zhǔn)(如U、CCEE等)及EMC指令的限制(如

IEC、FCC、CSA),交流輸入側(cè)必須加EMC濾波及使用符合安全標(biāo)準(zhǔn)的元件,這樣就限制ACDC電源體積

的小型化,另外,由于內(nèi)部的高頻、高壓、大電流開關(guān)動作,使得解決EMC電磁兼容問題難度加大,也就對

內(nèi)部高密度安裝電路設(shè)計提出了很高的要求,由于同樣的原因,高電壓、大電流開關(guān)使得電源工作損耗增大

限制了Aα/DC變換器模塊化的進(jìn)程,因此必須釆用電源系統(tǒng)優(yōu)化設(shè)計方法才能使其工作效率達(dá)到定的滿意

AC/DC變換按電路的接線方式可分為,半波電路、全波電路。按電源相數(shù)可分為,單相、三相、多相。按電

路工作象限又可分為一象限、二象限、三象限、四象限

開關(guān)電源的選用

開關(guān)電源在輸入抗干擾上,由于其自身電路結(jié)構(gòu)的特點(多級串聯(lián)

般的輸入干擾如浪涌電壓很難通

過,在輸出電壓穩(wěn)定度這一技術(shù)指標(biāo)上與線電源相比具有較大的優(yōu)勢,其輸出電壓穩(wěn)定度可達(dá)(0.5

1)‰開關(guān)電源模塊作為種電力電子集成器件,在選用中應(yīng)注意以下幾

電流選擇編輯

因開關(guān)電源工作效率高,一般可達(dá)到80%以上,故在其輸出電流的選擇上,應(yīng)準(zhǔn)確測量或計算用電設(shè)備的

吸收電流,以使被選用的開關(guān)電源具有高的價格比,通常輸出計算公式為

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