HOW TO DIFFERENTIATE QC fast wall charger AND USB-C POWER DELIVERY wall charger?
Well, both the Quick Charge from Qualcomm and USB Power Delivery from the USB-IF standards are the most common used protocols. While, these are the major differences;
1. The language they speak;
USB-PD is an entirely different language than QC 2.0 / 3.0 / 4.0. They negotiate and handle power differently from each other. If you plug USB-PD into a QC device it should default to 5V, 1 or 2 amp standard charging.
2. Quick charge is a proprietary technology, while USB Power Delivery is a standard protocol from the USB-IF standards organization
QC allows charging of battery powered devices, primarily mobile phones, at levels above and beyond the typical 5 volts and 2 amps which most USB standards allow for. To take advantage of Qualcomm Quick Charge, both the host providing power and the device must support it.
USB-PD can be implemented over any USB connection, but requires new connectors and cables for full USB 2.0 connector support. By comparison, Power Delivery can support voltages as high as 20V, and can support charging at up to 100W max.
3. Also, it depends on what devices you are using
It seems that USB-PD can deliver a much higher power output, but actually most current smartphones do not need more than 18w charging, that’s why Qualcomm’s Quick Charge is widely adopted by most of smartphones, while Power Delivery as a standard that anyone can use is more designed for larger devices like laptops and household appliances.
However, things changed with the introduction of QC 4.0
Qualcomm announced Quick Charge 4.0 in 2016 which is compatible with Power Delivery. In other words, Quick Charge 4.0 has simply learned to speak PD language now.
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