电源供电设备的电源设计考虑

　　电源供电设备的电源设计考虑

　　在智能手机和平板电脑等吸引人的便携式设备占主导地位的世界里，人们很容易忘记大多数消费电子产品都是从电源供应。然而，这些产品使用相同的敏感硅-需要稳定，低电压电源作为他们的手持同行。

　　本文阐述了在电源供电设备的功率调节的基础知识，从线的变压器，将高电压到一个孤立的低电压，通过交流线路整改方法转换成交流电压到DC，然后到DC /直流转换器选项，提供稳定的低压输出的电子器件。

　　这篇文章包括一个样本计算来证明开关稳压器是一种比低压差线性稳压器更有效的解决方案，从而实现更紧凑的设计，不需要散热片来消除多余的热量。

　　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.