電源供電設備的電源設計考慮

　　在智能手機和平板電腦等吸引人的便攜式設備占主導地位的世界里，人們很容易忘記大多數消費電子產品都是從電源供應。然而，這些產品使用相同的敏感硅-需要穩定，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備的功率調節的基礎知識，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換成交流電壓到DC，然后到DC /直流轉換器選項，提供穩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穩壓器是一種比低壓差線性穩壓器更有效的解決方案，從而實現更緊湊的設計，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.