What is the qc4+ fast charging protocol?

QC4 fast charging protocol is a combination of USB PD PPS protocol and QC3.0/2.0 fast charging protocol. It is a multi-functional, multi-protocol fast charging technology. The QC4 charging protocol is compatible with USB PD3.0 (PPS) and is also downwardly compatible with USB PD2.0, QC3.0, QC2.0, BC1.2 and other protocols. The first prerequisite for supporting USB PD and QC4 is that both ends have USB-C interface support and power negotiation messages based on the CC (configuration channel) in the USB-C interface.

#The operating environment of this tutorial: Android 13 system, Xiaomi 12 mobile phone.

1. What is QC4 fast charging?

The QC4 charging technology launched by Qualcomm in November 2016 was compatible with the USB PD2.0 protocol for the first time, and the 12V voltage range was cancelled, and the power was increased to 28W. The standard 5V can output a maximum current of 5.6A, and the 9V can output a maximum current of 3A. The voltage range is subdivided into 20mV levels. It allows the terminal to charge from zero power to 50% in 15 minutes, and has advanced technology to extend battery life, enhance safety and expand charging intelligence.

Later, Qualcomm continued to develop and further built QC4, and released the latest QC4 charger and QC4 car charger at the 2017 Qualcomm Snapdragon Technology Summit, which also marked the official adoption of QC4 fast charging technology. QC4 replacement. The Nut R1, Xiaomi 8 and Xiaomi 9 released by Smartisan all support the QC4 fast charging protocol.

Qualcomm QC4 charging protocol is compatible with USB PD3.0 (PPS), and is also downwardly compatible with USB PD2.0, QC3.0, QC2.0, BC1.2 and other protocols; and according to Qualcomm engineers , mobile phones based on Qualcomm Snapdragon 600, 700, and 800 platforms can implement QC4 fast charging (the final decision on whether to support it or not depends on the mobile phone manufacturer).

2. What is the relationship between QC4 and USB PD?

USB PD (USB Power Delivery) is a fast charging specification developed by the USB-IF organization. USB PD increases power delivery through USB cables and connectors, extending cable bus power capabilities in USB applications. This specification enables higher voltages and currents, delivers power up to 100 watts, and can freely change the direction of power delivery.

PPS (Programmable Power Supply) programmable power supply is a type of Power Supply supported in USB PD3.0. It is a power supply that uses the USB PD protocol output and can realize voltage and current regulation. The PPS specification integrates the current two charging modes of high voltage and low current and low voltage and high current. The voltage amplitude modulation drop is also 20mV, which is only one-tenth of the QC3.0 standard, and the adjustment is more precise.

QC4 fast charging protocol is a combination of USB PD PPS protocol and QC3.0/2.0 fast charging protocol. It is a multi-functional, multi-protocol fast charging technology. This has already been revealed by George Paparrizos, senior director of Qualcomm Wireless Communications Technology (China) Co., Ltd., at the "Tel Forum 2017 Fast Charging Technology Standards and Applications Seminar".

In addition, the first prerequisite for supporting USB PD and QC4 is that both ends have USB-C interface support and power negotiation messages based on the CC (configuration channel) in the USB-C interface.

3. What are the advantages of QC4 fast charging?

1. Dual Charge: The dual-channel charging capability has been further improved, which can disperse the charging current, achieve less heat and shorten charging time.

2. Intelligent thermal balance: further enhances dual-channel charging, aiming to automatically charge through the line with the lowest temperature and avoid hot spots to optimize charging.

3. More advanced safety features: Monitoring terminal housing and connector temperature levels simultaneously, this additional layer of protection helps prevent overheating, short circuiting or damage to the Type-C connector.

4. What is the difference between QC4 and QC4?

Charging Head Network has reviewed the PDF technical manual of Qualcomm Quick Charge4/4. This table shows the difference between QC4 and QC4 very intuitively. Through comparison, we know:

1. Similarities

(1) Quick Charge4/4 both support USB PD PPS;

(2) Quick Charge4/4 all need to adopt USB-C interface;

(3) The charging power of Quick Charge4/4 requires ≥18W.

2. Differences

(1) Quick Charge4 does not support QC2.0, QC3.0;

(2) Quick Charge4 supports QC2.0, QC3.0 .

In other words, Qualcomm QC4 adds compatible support for QC3.0 and QC2.0 on the basis of USB PD3.0 and PPS.

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