利用PMBus数字电压调节器控制

　　利用PMBus数字电压调节器控制

　　数字控制优化了直流至直流开关稳压器的效率、线路和负载调节。工程师能够适应调节器的闭环响应，例如，完美地匹配他们产品的需求。

　　然而，数字控制实际上是在一个由几个监管者组成的更复杂的系统中形成的。个人设备可以监督由中央电力系统控制主机通过如标准化电源管理总线数字通信总线（PMBus）。主机可以是一个专用于电力系统控制的集成电路，一个通用的微控制器，带有图形用户界面（GUI）的笔记本电脑，或一个ATE（用于电源或系统测试过程中）。

　　本文探讨了PMBus，描述它是如何工作的，并确定了一些数字电源芯片，已经接受了技术。

　　The basics

　　PMBus is based on the System Management Bus （SMBus） typically found in computer motherboards for communication with the power source. However， while SMBus is designed for communication with low-bandwidth devices， PMBus is targeted at digital management of power supplies， components， and power-related chips such as a rechargeable battery subsystem or temperature-， fan- and voltage-sensors and clock chips.

　　SMBus itself was based on Inter-Integrated Circuit （I²C）， the serial single-ended computer bus originally designed by Philips and used for attaching low-speed peripherals to a motherboard or other embedded system. As a result of this foundation， PMBus is a relatively low speed， two-wire communications protocol. However， unlike SMBus and I²C， PMBus defines a substantial number of domain-specific commands rather than just detailing how to communicate using commands defined by the reader.