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the difference between PD fast charging and QC fast charging

Anna original 2024-01-05 16:49:30

The difference between USB-PD fast charging and OCQ fast charging:
(1) USB interfaces are different
 USB-PD fast charging is a charging protocol used only for USB Type-C ports. while QC protocol can be commonly used for many ports, for example:  Android Micro-B interface, USB Type-A port (QC2.0/3.0), besides QC protocol can also be a USB type C interface (QC2.0/3.0/4.0).

(2)The communication recognition channels for fast charging are different.
USB-PD fast charging is recognized through CC PIN communication, not through D positive or D negative to identify. QC fast charging is used to identify communication issues by synchronizing D positive and D negative. This is also the main difference to distinguish between the two fast charging protocols. In the USB type-C interface, there are D positive and D negative pins.Therefore, USB type-C can be used as a dual compatible product for USB-PD fast charging and QC fast charging. However, Micro B and USB Type-A can only achieve the QC3.0/QC2.0 protocol.

3. The charging power of the power supply is different.
QC fast charging is the earliest high-voltage fast charging protocol, with a charging power of 100W.
USB-PD fast charging is currently the most comprehensive fast charging protocol, with commonly used powers of 18W, 30W, 45W, 60W and 65W. With the release of the USB-PD3.1 standard, power has been divided into two ranges: Standard Power Range (SPR) and Extended Power Range (EPR). The standard power range is currently the mainstream USB PD3.0 PPS fast charging standard on the market, and the fast charging power remains unchanged at 100W; And the new 28V, 36V, 48V belongs to the extended power range, and the output current corresponding to the three voltages is 5A. The terminal output power can reach 240V.

4) The difference between power supply equipment and application equipment
QC3.0/QC2.0 applications include lithium-ion battery charging devices with a power of 100W or less and a USB port, such as mobile phones and power banks.
USB-PD fast charging has DFP (power supply mode) and DRP (power supply without bidirectional mode), and has the uniformity of USB-C interface function, high power and other characteristics. It has a wide range of application devices and a lot of expansion space.
The USB-PD protocol is not equivalent to the QC protocol, but rather includes and is included in the relationship. In the PPS (Fast Charging Technology Specification) released by USB-IF, the USB-PD3.0 protocol has included Qualcomm's Qc3.0 and QC4.0 protocols.

    Shenzhen Huagon Technology Co., Ltd. is located in Dalang Longhua District, Shenzhen. With a history of ten years, we are an innovative service-oriented enterprise focusing on providing all-round customized services. 

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