IEC 63002-2021 pdf Interoperability specifications and communication method for external power supplies used with computing and consumer electronics devices
4 EPS interoperability based on USB technologies Overview 4.1 Clause 4 describes the USB common charging interoperability model and provides a summary of the USB Type-C and USB Power Delivery technologies specified in IEC 62680 ‑1‑3 and IEC 62680-1-2, respectively. 4.2 General Since its introduction over 20 years ago, USB charging technology has consistently provided 5 V DC power and relied on a common USB Standard-A connector on the power source. When used with defined legacy cables and adapters, USB Type-C-based power sources, including those that source higher voltages, remain electrically and mechanically interoperable with previous generation USB devices, while enabling new capabilities for devices that have evolved to align with these new capabilities. Figure 2 illustrates the USB EPS charging application model consisting of the EPS (Source) with a USB Type-C receptacle, the device to be charged (Sink) and the charging cable connecting the device to the EPS. This model also enables compatibility with devices that are based on legacy USB connectors, have a permanently attached cable, or use a cable that is device specific. Several usage examples demonstrating end-to-end charging interoperability based on this comprehensive model are presented in Annex D.
4.5 USB Power Delivery (USB PD) Power transfer at other than 5 V or over 3 A shall comply with IEC 62680-1-2 (USB Power Delivery). USB Power Delivery standardizes the discovery, configuration and functional operation of more capable USB Type-C power sources and battery chargers. The USB PD protocol, operating as a digital communication over the USB Type-C CC interface, enables a predictable, reliable user experience based on a common set of robust mechanisms and communication exchanges between the USB Source and the Sink. The comprehensive set of power delivery methods supported by the USB PD protocol enables a broad range of battery charging approaches and profiles that are specific to the design and operation of the device being charged (the Sink) – this enables device designs to evolve and innovate while the capabilities of a USB PD-based charger can remain a constant.
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