IEC 62680-1-2:2021定义了涵盖USB系统所有元件的电源传输系统，包括:主机、设备、集线器、充电器和电缆组件。本规范描述了管理高达100W的USB供电所需的体系结构、协议、电源行为、连接器和布线。本规范旨在完全兼容并扩展现有USB基础设施。本规范旨在允许系统原始设备制造商、电源和外围设备开发商在不丧失向后兼容性的情况下，为产品多功能性和市场差异化提供足够的灵活性。 第四版取消并取代2019年出版的第四版，构成技术修订版。 它也被标识为USB电源传输规范，版本3.0，版本2.0 此更新版本的USB PD规范包含所有针对USB PD 3.0，V1.2的ECN。这就形成了一份完整的印刷规范，将所有ECN合并到一份硬拷贝规范中。

IEC 62680-1-2:2021 defines a power delivery system covering all elements of a USB system including: Hosts, Devices, Hubs, Chargers and cable assemblies. This specification describes the architecture, protocols, power supply behavior, connectors and cabling necessary for managing power delivery over USB at up to 100W. This specification is intended to be fully compatible and extend the existing USB infrastructure. It is intended that this specification will allow system OEMs, power supply and peripheral developers adequate flexibility for product versatility and market differentiation without losing backwards compatibility. This fourth edition cancels and replaces the fourth edition published in 2019 and constitutes a technical revision. It is also identified as USB Power Delivery Specification, Revision 3.0, Version 2.0 This updated release of the USB PD specification was made to incorporate all the ECNs that were made to USB PD 3.0, V1.2. This makes a full completed printed specifications with all ECNs incorporated into a hard copy specification.