USB power delivery specification and certified USB charger compliance program

USB-C charger with Power Delivery (PD) has been popular with customers for recent months, as it can provide the maximum power levels depending on the current-carrying capacity of a mobile device and make users get fast charging. Accordingly, here are the two standards developed by USB-IF that are worth exploring, one is the USB PD specification and the other is Certified USB Charger Initiative.
The first version of the USB PD specification was announced by USB-IF in 2012 and the latest version 3.0 was released in 2016. The main feature of USB PD is to enable customers to achieve fast charging and data transfer over a single cable across multiple mobile devices. It supports power levels from existing USB standards up to 100W, enables the Host/ Peripheral devices with the power to provide the power, and optimizes power management across multiple peripherals.
With the growing need for the adoption of USB-C™ and USB PD, in 2016, USB-IF specially announced Certified USB Charger Logo and Compliance Program on the basis of the USB-C and USB PD specifications, so as to identify power capability in watts and provide consumers with a reliable and reusable charger. Furthermore, USB-IF introduced fast charging to expand its Certified USB Charger Initiative in early January 2018, which means that USB-IF Logo and Compliance Program is now certifying USB Fast Chargers.