设计USB Type-C和使用电源快速充电

　　设计USB Type-C和使用电源快速充电

　　USB已经从一个数据接口，能够提供有限的电源到一个主电源与一个高速数据接口。USB Type-C™和USB供电（PD）2（和即将到来的3版）加速了这一演变。然而，需要谨慎选择应用USB Type-C USB PD提供多个功率水平的最具成本效益的解决方案。

　　例如，USB Type-C就可以支持高达5伏3安培（15 W），而USB PD USB Type-C使生态系统支持多种功率最高可达20伏，5安培（100 W）。缺点是，USB PD增加设计的复杂性和成本的材料清单（BOM）。

　　Fortunately， by using a range of recently introduced components， designers can take advantage of new capabilities such as reversible power delivery， power negotiation and the 100 watt power delivery to design USB power supplies that charge devices – even portable computers – safely and quickly.

　　This article attempts to cut through the complexity of USB Type-C and USB PD by explaining how designers can use USB Type-C for many applications and when they should migrate to USB PD for higher power applications. The article will then provide guidance on how to implement practical USB Type-C and USB PD designs.