Which is faster, PD charging or QC charging for mobile phones? What affects the charging speed?

As we all know, there are generally three types of mobile phone charging, PD charging, QC charging and PE charging. At present, the charging power advertised by mobile phones generally refers to the maximum output power of the charger when the charger is used to charge the mobile phone. Let's read the article below to learn more!

Which is faster, PD charging or QC charging for mobile phones?

There is a big difference between PD charging and QC charging. The voltage regulation of PD charging is 20mV per level, while that of QC charging is 200mV per level. That is to say, the voltage regulation of PD charging is 10 times more precise than that of QC charging. Under the premise of considering the voltage and current safety of the battery, QC charging will be reserved, resulting in relatively low QC charging efficiency.

Therefore, in comparison, PD charging is more efficient than QC charging!

What factors affect charging speed?

30W charging is the output power of the charger, and PD charging and QC charging are two different charging methods.

In other words, what is actually compared is the impact of different charging methods on charging speed under the same charging power!

First of all, it should be pointed out that charging is related to many factors, such as the selection of devices in the charging path, the impedance of the wiring in the charging path, the efficiency of the charging chip, the battery capacity and the supported charging methods, etc. Another point is the adjustment of the charging strategy due to the influence of temperature during charging.

Notes on mobile phone charging

1. The maximum output power of the charger is not necessarily equal to the maximum power obtained by the mobile phone;

Generally speaking, the maximum output power advertised by the charger will be greater than or equal to the power obtained by the mobile phone. In order to pass the national safety certification, the maximum output power advertised by the charger will generally be slightly greater than the power obtained by the mobile phone.

2. Based on the first point above, we can easily conclude that the maximum power obtained by the mobile phone is not equal to the maximum output power of the charger;

For example, Xiaomi Mi 9 Pro uses a 40W limited power supply, but Xiaomi Mi 9 Pro uses a 45W charger. Of course, one advantage of this is that it can charge Xiaomi laptops, which is equivalent to a dual-purpose charger, which is both convenient and practical!

3. Obviously, the charging power advertised on the phone is not the power entering the battery;

Related News

USB-PD is a fast charging specification developed by the USB-IF organization and is one of the current mainstream fast charging protocols. The USB-PD fast charging protocol is output through the Type-C interface, but it cannot be said that if there is a Type-C interface, it must support the USB-PD protocol fast charging. The USB-PD fast charging protocol can increase the power transmission through USB cables and connectors, expand the cable bus power supply capacity in USB applications, thereby achieving the purpose of increasing the charging voltage or current, and can freely change the direction of power transmission. The Type-C interface supports a maximum of 15W (5V/3A) by default, but after implementing the USB-PD protocol, the output power can be supported to a maximum of 100W (20V/5A). Therefore, many devices with practical Type-C interfaces now support the USB PD protocol. PD charging communicates through the CC pin of the Type-C interface to achieve PD charging. It should also be pointed out that the voltage adjustment step of PD charging is 20mV per gear.