關(guān)于DC / DC轉(zhuǎn)換器的幾點(diǎn)思考

　　簡介

　　許多系統(tǒng)要求直流電源的主要來源被轉(zhuǎn)換為其他電壓。電池驅(qū)動(dòng)電路明顯的候選人。在筆記本電腦6V或12V電池必須轉(zhuǎn)換為不同的潛力存儲(chǔ)器，磁盤驅(qū)動(dòng)器，顯示和操作邏輯。在理論，交流線路供電系統(tǒng)不需要DC / DC轉(zhuǎn)換器因?yàn)殡[含的電源變壓器可以裝備具有多個(gè)次級(jí)。在實(shí)踐中，經(jīng)濟(jì)學(xué)，噪音要求，供應(yīng)總線分配問題和其他限制往往使DC / DC轉(zhuǎn)換。一常見的例子是邏輯為主，5V供電系統(tǒng)利用±15v驅(qū)動(dòng)模擬元件。

　　DC / DC轉(zhuǎn)換器的應(yīng)用范圍是大，有許多變化。興趣是相應(yīng)的轉(zhuǎn)換器相當(dāng)高。增加單電源供電系統(tǒng)，剛度性能要求和電池操作增加了轉(zhuǎn)換器的使用。

　　Historically， effi ciency and size have received heavy emphasis. In fact， these parameters can be signifi cant， but often are of secondary importance. A possible reason behind the continued and overwhelming attention to size and effi ciency in converters proves surprising. Simply put， these parameters are （within limits） relatively easy to achieve！ Size and effi ciency advantages have their place， but other system-oriented problems also need treatment. Low quiescent current， wide ranges of allowable inputs， substantial reductions in wideband output noise and cost effectiveness are important issues. One very important converter class， the 5V to ±15V type， stresses size and effi ciency with little emphasis towards parameters such as output noise. This is particularly signifi cant because wideband output noise is a frequently encountered problem with this type of converter. In the best case， the output noise mandates careful board layout and grounding schemes. In the worst case， the noise precludes analog circuitry from achieving desired performance levels （for further discussion see Appendix A， “The 5V to ±15V Converter — A Special Case”）。 The 5V to ±15V DC/DC conversion requirement is ubiquitous， and presents a good starting point for a study of DC/DC converters.