From the horse’s mouth
USB Implementers Forum
The USB Implementers Forum are working on a project to achieve a reference design for USB battery chargers and power supplies in order to support fast charging or stronger power output.
It is an extension of the initial USB Battery Charger specifications used for just about every smartphone charger but is extended to encompass USB Power Delivery which is being used to provide power to laptops. The goal is to be able to use USB PD chargers on all USB-C devices that support this power-intake path thus reducing e-waste and creating room for innovation when it comes to designing USB-based charging devices.
Here, it is based on the USB Power Delivery 3.0 standard but makes heavy use of the Programmable Power Supply function that is part of that standard. It allows for backward compatibility with existing USB devices that honour prior versions of that standard.
The idea of a Certified USB Fast Battery Charger as a logo-based certification program has been brought about due to the existence of poor-quality USB chargers and cables sold online or through a myriad of stories that are placing our devices at risk of being damaged. Here, it also allows customers to quickly identify power-source devices that will properly and safely provide the high current throughput in a vendor-independent manner, in a similar approach to how the Dolby symbol allowed us to identify the fact that a cassette player was able to play pre-recorded cassette tapes at the best quality or our favourite film was prepared with surround sound.
One of the desires also being raised in this certification process is the ability for host devices to implement authentication of cables and other devices and use this as a machine-level manner for verifying devices. The device-authentication feature is a goal that the USB Implementers Forum are intending to implement by this year’s end and is also appealing towards verifying that USB devices are what they say they are so as to protect against USB-borne computer attacks.
What is being achieved by the USB Implementers Forum is that there is a goal to permit fast charging of smartphones and laptops in a safe manner without having to be tied to a particular vendor’s accessories.