電源供電設(shè)備的電源設(shè)計考慮

　　在智能手機和平板電腦等吸引人的便攜式設(shè)備占主導(dǎo)地位的世界里，人們很容易忘記大多數(shù)消費電子產(chǎn)品都是從電源供應(yīng)。然而，這些產(chǎn)品使用相同的敏感硅-需要穩(wěn)定，低電壓電源作為他們的手持同行。

　　本文闡述了在電源供電設(shè)備的功率調(diào)節(jié)的基礎(chǔ)知識，從線的變壓器，將高電壓到一個孤立的低電壓，通過交流線路整改方法轉(zhuǎn)換成交流電壓到DC，然后到DC /直流轉(zhuǎn)換器選項，提供穩(wěn)定的低壓輸出的電子器件。

　　這篇文章包括一個樣本計算來證明開關(guān)穩(wěn)壓器是一種比低壓差線性穩(wěn)壓器更有效的解決方案，從而實現(xiàn)更緊湊的設(shè)計，不需要散熱片來消除多余的熱量。

　　Stepping down the mains voltage

　　Despite the fact that mains outlets around the world supply AC voltages from 90 to 264 V running at frequencies from 47 to 63 Hz， almost all office and home equipment cannot be plugged straight into a wall socket without some kind of power conversion.

　　The AC input typically has to be stepped down and the voltage regulated across a wide range of input line fluctuations and output loads. An additional challenge is to ensure that the DC output from the power supply does not include a significant AC component that manifests itself as voltage ripple. Most silicon circuitry requires a regulated supply that exhibits an output ripple of no more than one percent of the output voltage. What is more， just to make life a little more difficult， power supplies are typically required to deliver multiple output voltage and load capabilities. Figure 1 shows a simple schematic of a typical power supply for an item of office or home equipment.