什么是PD协议快充，一分钟搞懂
说起快充协议，大家可能比较熟悉高通的 QC 快充。而对于 USB-PD （全名“USB Power Delivery”）快充协议，可能大家会感到陌生，今天就一起来了解下 USB-PD 快充协议。
1、什么是USB-PD快充
USB-PD 是由 USB-IF 组织制定的一种快速充电规范，是目前主流的快充协议之一。 USB-PD 快充协议是以 Type-C 接口输出的，但不能说有 Type-C 接口就一定支持 USB-PD 协议快充。
PD充电器，以Type-C作为输出接口
其实我们身边很多手机/笔记本早就支持USB-PD快充了，从2017年苹果的iPhone 8(Plus)、iPhone X起就开始支持USB PD快充, 不过需要自行买USB C to Lighting数据线。安卓阵营也是从2017年华为Mate 10、小米MIX 2s 起开始支持 USB PD 快充。
Mate 20 Pro是Type-C 接口，支持 PD 快充
2、PD 协议快充优势明显
USB-PD 快充协议可以透过 USB 电缆和连接器增加电力的输送，扩展USB应用中的电缆总线供电能力，从而达到提高充电电压或电流的目的，并且可以自由改变电力的输送方向。
Type-C 接口默认最大支持 15W (5V/3A)，但是在实现了 USB-PD 协议以后，能够使输出功率最大支持到 100W (20V/5A)。所以现在许多实用 Type-C 接口的设备都会支持 USB PD 协议。
USB PD 和 QC3.0 比较
3、与其它充电协议的关系
USB-PD 协议与其它厂家的快充协议并不是同等的关系，而是包含与被包含的关系。在 USB-IF 发布的 PPS （快速充电技术规范）里， USB-PD 3.0 协议已经包含了高通 QC 3.0 与 4.0 ，华为的 SCP 与 FCP ， MTK 的 PE3.0 与 PE2.0 ，还有 OPPO 的 VOOC 。
通过以上我们可以看到USB-PD 协议的强大，这也是近年来手机和笔记本快速普及Type-C接口并支持 USB-PD 快充的原因。当然，市面上一些Type-C 扩展坞也没有缺席支持PD快充，不然怎么能适配好手机和电脑呢。
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