What is a Fast Charging Protocol?
A fast charging protocol is a 'communication language' between the charger and the device. The charger and phone negotiate charging voltage and current through the protocol to ensure the charging process is safe and efficient. If the charger and phone don't support the same protocol, they can only charge at normal speed (usually 5V/1A or 5V/2A).
USB PD: The Most Universal Fast Charging Protocol
USB PD (USB Power Delivery) is the standard fast charging protocol developed by the USB-IF organization, and it's currently the most widely used. The latest PD 3.1 standard supports up to 240W (48V/5A) and can power phones, tablets, laptops, and even monitors. PD's biggest advantage is its universality - almost all laptops and most phones support it.
Qualcomm QC: Qualcomm's Fast Charging Solution
QC (Quick Charge) is a fast charging protocol from Qualcomm, mainly used in Android phones with Qualcomm Snapdragon processors. The latest QC5 standard supports up to 100W+ power. QC's strength is good compatibility - if your phone has a Qualcomm chip, it basically supports QC fast charging. But QC is mainly for phones and less commonly used on laptops.
Other Common Fast Charging Protocols
Besides PD and QC, there are many proprietary protocols: Huawei's SCP/FCP (up to 100W), OPPO's VOOC/DASH (up to 150W), vivo's FlashCharge (up to 200W), Xiaomi's Mi Turbo Charge (up to 210W), and more. These proprietary protocols usually offer higher power but have poor compatibility - you need the corresponding charger to trigger fast charging.
PD vs QC: Which to Choose?
If you use an iPhone or MacBook, PD fast charging is the obvious choice. If you use an Android phone, especially one with a Qualcomm chip, both QC and PD work. If you have multiple devices (phone + laptop + tablet), a PD charger is more universal. The best choice is a multi-protocol GaN charger that can fast charge any device.
The Future of Fast Charging Protocols
The future trend of fast charging protocols is unification and convergence. USB PD 3.1 has already raised the power limit to 240W, basically covering all consumer electronic device needs. Major manufacturers are also gradually moving toward PD - brands like Xiaomi and OPPO have started supporting PD on their new models. The future will likely be PD-dominant with proprietary protocols as supplements.
Summary
Although there are many fast charging protocols, the core two are PD and QC. PD has the strongest universality, suitable for users with multiple devices; QC is suitable for Qualcomm chip phone users. When buying a charger, prioritize a PD-supporting GaN charger - it can basically meet the fast charging needs of all your devices.