What is QC Fast Charging? How is it different from PD Fast Charging?
Before comparing the strengths and weaknesses of QC and PD fast charging technologies, it’s essential to understand their principles. Only then will we know how these two technologies perform when applied to products.
Fast Charging Technology 1: QC Fast Charging
QC (Quick Charge) is a fast-charging technology developed by Qualcomm. Qualcomm’s Snapdragon mobile platform dominates the smartphone market, so the QC fast charging technology supported by this platform also enjoys high visibility. The early versions of QC focused primarily on increasing current, but with the evolution of the technology, dynamic adjustments to current and voltage were introduced. Currently, QC has reached version 4+, which incorporates QC 4, based on the USB PD 3.0 PPS protocol, and combines QC 3.0/2.0 protocols.
Any charger that supports QC technology and has been certified will display its logo on the casing.
Fast Charging Technology 2: PD Fast Charging
PD Fast Charging stands for USB-PD (USB Power Delivery). Although USB-PD chargers have not yet surpassed Qualcomm’s QC chargers in market share, PD Fast Charging is gaining momentum due to its support for a wide range of chargers. With the iPhone and iPad now supporting USB-PD, the trend is rising.
USB-PD is a power transmission specification defined by the USB-IF organization. It encompasses not only PD 2.0/PD 3.0 but also the PD 3.0 PPS fast charging feature. According to the specification, all chargers supporting USB-PD can begin charging once they establish communication with the system through a USB Type-C port and activate the output switch.
PD charging can deliver a maximum power of 100W (20V * 5A). However, the power required for charging is determined by the communication between the CC pin of the Type-C cable and the system. The applications for PD fast charging are extensive and commonly used in smartphones, laptops, tablets, medical equipment, and power tools. Even Qualcomm’s QC4+ references PD 3.0 PPS, indicating promising developments for PD fast charging in the future.
Once a product passes USB-PD certification, the USB CHARGER xx W logo will be displayed.
Phihong’s Application of Fast Charging Technology
Phihong offers a range of PD products from 15W to 60W, all certified under PD 3.0, including a 27W product that has received fast charging certification. For more information on the products and their applications, please refer to the table below.
| Fast Charging Technology | Watt | Applications |
|---|---|---|
|
PD2.0/3.0 Protocol |
18W | Mobile / VR |
| 25W |
Mobile |
|
| 27W | ||
| 30W | ||
| 45W | ||
| 27W | Power tool | |
| 45W | Medical device | |
| QC4+ Protocol | 24W | Video game console |
As explained above, do you now understand QC Fast Charging and PD Fast Charging? Established in 1972, Phihong is one of the world’s leading power supply manufacturers, widely recognized by renowned global customers. Phihong focuses on developing and manufacturing high-efficiency power supply products, continuously innovating while maintaining compliance with high-quality and safety standards. Feel free to contact us for more information or to inquire about collaboration opportunities in power supply solutions.