USB-C cable has many advantages, from its reversible shape to its compact size. But it offers the convenience of fast charging for supported devices, such as the iPhone X, that makes it so popular. This is achieved through a technology called Power Delivery, or more specifically, Power Delivery 2.0 and 3.0. USB-C enjoys all of its reversible benefits and charges devices at higher voltages and wattages, providing support for charging a wider range of devices and increasing charging speeds.
The idea behind USB Power Deliver technology is to provide faster charging speeds for devices that can handle higher wattages. Before USB-C and Power Delivery, existing devices could charge up to 15 W, but most didn't even exceed 7.5 W. This limitation was based on the mechanical design of USB cables - they simply couldn't safely handle more power.
With the finalization of USB-C in 2014, there are finally USB cables that can actually handle higher power. USB-C has a separate configuration channel that allows it to complete power negotiation between source and receiver. power Delivery 2.0 was released around the same time, allowing 100W of power over 20V connections. The key here is to support voltage profiles beyond the standard 5 volts and 3 amps - supporting higher voltages and currents is what makes USB-C PD so valuable. It's also important to note that in order to support more than 60W (20V @ 3A), electronically marked cables must be used for safety reasons.
This is a big step forward, as previously most USB devices could charge at no more than 7.5W (5V @ 1.5A), resulting in slow charging of smart devices and no practical option for charging larger devices such as tablets or laptops. power Delivery aims to change this.
The latest version of Power Delivery, PD 3.0, is a more robust standard than PD 2.0. It allows the same charging rate as PD 2.0, but with more efficient charging and longer battery life.
While Power Delivery 2.0 changed the "rules" of the USB charging game, Power Delivery 3.0 is focused on improving information about charging. or if the charge rate has dropped unexpectedly for some reason.
This is important for diagnostics, but also for dynamic management of charging. power Delivery 3.0 allows for finer control of VBUS power (an important part of USB power management). This is important because it allows the charger and device to negotiate the optimal charge rate while extending battery life.
Look at a charger's specs before you buy to determine if it supports PD 3.0. if so, you know you're getting the latest safety and fast charging features. in 2018, the USB Implementers Forum, the USB governing body, initiated a new naming convention in which chargers that can support PD 3.0 over USB-C can be designated as certified USB fast chargers So you can keep an eye on that certification as well.
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