What is the fast charging technology of mobile phones?

What is mobile phone quick charging?

Let’s start with two physical formulas:

Energy W (battery capacity) = power (P) × Time

Power (P) = voltage (U) × Current (I)

Principle of fast charging: shorten the time required for charging by increasing the charging power P.

There are three ways to increase the power, namely, increasing the voltage, increasing the current, and increasing the voltage and current at the same time.

These three ideas have derived three representative fast charging technologies: high-voltage fast charging represented by Qualcomm Quick Charge 3.0/2.0 and MediaTek Pump Express Plus; low-voltage fast charging represented by OPPO VOOC flash charging and USB 3.1 PD Fast charge. (Most of the fast charging solutions of other mobile phone manufacturers are based on these three, or developed on the basis of these three).

The current mainstream mobile phone fast charging protocols

1, PD protocol

The PD protocol refers to the USB-PD protocol, which is a fast charging protocol proposed by the USB-IF organization. The full name is USB Power Delivery, which can theoretically reach 100W. In addition to mobile phones, many laptops and other devices also use this protocol.

2, PE protocol

The PE protocol was launched by MediaTek, and its full name is Pump Express, which is characterized by allowing the charger to determine the initial voltage required for charging according to the current.

3, QC protocol

The Qualcomm QC protocol is a fast charging technology developed by the well-known chip company Qualcomm for the Snapdragon processor. The full name is Quick Charge. As the leader of mobile phone chips, Qualcomm has integrated the QC protocol in its own chip very early. Because the PD fast charging protocol is compatible with the QC protocol, some mobile phones without Qualcomm processors can also support the QC protocol.

4, VOOC Flash Charge

VOOC flash charge is a fast charging technology independently developed by OPPO. It is the world’s first mass-produced and commercial fast charging solution. Compared with other fast charging solutions, the technical threshold is higher. VOOC flash charging requires customized adapters and batteries. It adopts a low-voltage and high-current solution. Compared with other solutions, the charging power is higher, and the power conversion rate reaches 95%.

5, SCP / FCP flash charge

The full name of SCP is Super Charge Protocol, and the full name of FCP is Fast Charge Protocol. Both are Huawei’s own proprietary protocols. SCP is also the fast charging protocol currently being used by Honor.

The FCP protocol that was born in the early days adopted a high-voltage and low-current solution. After 2016, Huawei launched a new SCP protocol, which adopts a low-voltage and high-current solution similar to OPPO. The advantage is also to increase power while reducing heat generation. Later, on the basis of this agreement, Huawei added charge pump technology to reduce the charging voltage to about 5V, while increasing the current from 4A to 8A, which also achieved 40W super fast charging.

In addition, 65W super fast charger has also appeared on Huawei Mate X. In fact, it is the same as OPPO’s idea of dual battery charging, but the difference is that each battery is electromagnetically isolated to achieve the actual 60W charging speed.

6, Vivo FlashCharge

Flashcharge refers to the fast charging technology adopted by vivo, which is currently mainly used in iQOO mobile phones and Vivo mobile phones.

7, MI ChargeTurbo flash charge

MI ChargeTurbo flash charging technology is launched by Xiaomi for Mi series mobile phones, suitable for Xiaomi and Redmi mobile phones.

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