What is QC fast charging and what is PD fast charging??

What are the types of fast charging technologies?

At present, there are two main types of fast charging technology in the market: QC fast charging (Quick Charge) and USB-PD fast charging (USB Power Delivery).

1. QC Quick Charge

It is Qualcomm's Quick Charge technology (hereinafter referred to as QC). Currently, Qualcomm's Snapdragon mobile platform is the most popular smartphone among smartphones, so QC fast charging is the most visible fast charging technology.

• QC fast charging is the most visible fast charging technology. Basically all current mobile phones using Snapdragon processors can support QC fast charging. There are also models with non-Snapdragon processors that can also support it (such as Samsung S8, S9, Note 8 etc.).
• The latest version QC 4+ is currently only supported by Snapdragon 845 processor.
• In addition to continuing the advantages of QC4.0 such as 5 hours of use after 5 minutes of charging, 50% charging in 15 minutes, and support for the USB-PD standard, QC 4+ also enhances dual charging (Dual Charge) technology, smart temperature control system and charging safety. This feature makes QC 4+'s charging speed 15% faster than QC4.0. Compared with the more common QC3.0, it can increase the charging speed by 38%, and the maximum charging wattage can reach 27W.

2. USB-PD fast charging (USB Power Delivery)

USB Power Delivery (hereinafter referred to as USB PD) is a power supply technology defined by the USB Developer Forum. Although USB-PD charging technology currently does not have the largest market share, it supports many devices and even iPhone and iPad support USB-PD fast charging charging technology. Therefore, the editor believes that USB-PD fast charging has the potential to become The rising stars of the future.

• USB PD fast charging can be divided into five power specifications: 10W, 18W, 36W, 60W and 100W. The voltages are 5V, 9V, 12V and 20V. It can be used with Type-C connectors with a maximum current of 5A.
• USB PD fast charging can also be used in tablets, laptops, TVs and other products.
• During charging, the device and the charger will automatically determine how much current should be used for charging.
• Apple's iPhone 8 and subsequent models all support USB PD fast charging (iPhone USB-PD charging wattage 18W).
• To unify usage standards, chargers that support USB PD fast charging must use a Type-C interface.
• USB PD fast charging is also compatible with Qualcomm’s latest QC 4.0 and QC 4+ fast charging technologies.

Comparison between PD fast charging and QC fast charging

Currently, the common mobile phone fast charging technologies on the market are simply divided into two types: PD fast charging and QC fast charging. PD fast charging , USB Power Delivery (referred to as USB PD) in English, was developed by the USB-IF Association; Qualcomm is currently the brand with the largest market share of smartphone processors and has been developing fast charging technology Quick Charge for a long time. (referred to as QC fast charging ). So what is the difference between PD fast charging and QC fast charging? Let’s explain one by one through the following comparison table between PD fast charging and QC fast charging: