Quick Charge

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Quick Charge is the name for an originally proprietary process for the transfer of electrical power via a USB interface by controlling the supply voltage through the connected device. It is mainly used for fast charging of mobile devices such as special smartphones . The first version of the standard wasdevelopedby Qualcomm in 2013, revised in various versions in the following years and is usedfor mobile devicesunder various trade names, such as Adaptive Fast Charging by companies such as Samsung . The mobile devices thatsupport Quick Charge are based on the Snapdragon , a System-on-a-Chip (SoC) from Qualcomm. Quick Charge is a competitor interface to the likewise proprietary USB charging interface VOOC from Oppo Electronics , which works similarly to Huawei SuperCharge .

Even if Qualcomm QuickCharge is proprietary, the functionality has already been fully reverse-engineered .

The communication and the voltage is controlled via the data lines of USB 2.0 , other than through the power lines at the MediaTek - Pump Express -Schnellladestandard.

technology

USB power supplies for Quick Charge 2.0.

Since the electrical voltage to conventional USB 2.0 ports to 5  V is fixed and the contacts of the USB connector used in the current carrying capacity of 2  A are limited, the maximum transmittable power is set to 10  W restricted. With Quick Charge , the specially designed USB power supply unit sets a higher electrical voltage on the power supply contact, which, depending on the version of Quick Charge, is changed in steps according to the requirements of the mobile device. In addition, temperature sensors are installed in the charge controller of the mobile device and in the USB power supply unit to prevent overheating.

The higher voltage bypasses the limitation of the charging power due to the electrical resistance of the USB cable. It enables the transmission of a higher power with the same amperage.

This increased voltage is converted back down to the required voltage within the terminal.

The different voltages and charging capacities depending on the version of Quick Charge are summarized in the following table:

version Voltage on
USB interface
Maximum charging current Maximum charging power Year of development
Quick Charge 1.0 6.3V 1.5 A 9.45 W 2013
Quick Charge 2.0 5 V, 9 V, 12 V (20 V with revision B ) 2 A, 2 A, 1.67 A 18 W 2014
Quick Charge 3.0 3.6 V to 22 V
in steps of 0.2 V.
2.6 A or 4.6 A 18 W 2016
Quick Charge 4 3.6 V to 20 V, in steps of 0.2 V via QC;

5 V, 9 V via USB-PD

? 18 W or 28 W
[unclear sources]
2017
Quick Charge 4+ 5 V, 9 V via USB-PD;
3.6V to 20V
in steps of 0.2V via QC
3 A via USB-PD;
2.5 A or 4.6 A via QC
27 W via USB-PD;
18 W via QC
2017

Qualcomm QuickCharge 3.0 is backwards compatible with QuickCharge 2.0.

With the Quick Charge 4.0 and 4.0+ versions released at the end of 2017, Quick Charge is now compatible with the USB-PD standard (Power Delivery) and USB-C (USB Type C plug).

So-called fast charging cables are unsuitable for Quick Charge. With these, the two data lines of the USB standard are short-circuited so that the connected device is signaled that it can draw an unlimited current from the power supply unit at the given voltage (usually 5.0 V to 5.5 V). However, Quick Charge needs these data lines for voltage control.

Individual evidence

  1. a b Quick Charge 2.0. Retrieved September 5, 2017 .
  2. Qualcomm Quick Charge 1.0: Less Time Charging, More Time Doing , Qualcomm. February 14, 2013. 
  3. Quick Charge, Dash Charge, VOOC and Co .: Fast charging technologies in comparison. Retrieved September 2, 2017 .
  4. Qualcomm: Quick Charge 1.0 . (English, qualcomm.com [accessed February 6, 2018]).
  5. Quick Charge 2.0 support already existed in the Galaxy Note 4 , which appeared in September 2014.
  6. Quick Charge 3.0 specs . Qualcomm.
  7. a b Quick Charge 3.0 Battery Charger ICs. Qualcomm Technologies, accessed March 4, 2019 .
  8. | By: How the ZTE Nubia Z17 Phone Draws Power from the BatPower PD6 Power Bank Through USB Power Delivery. Retrieved March 4, 2019 .
  9. For fast charging, look for Qualcomm Quick Charge 4+ in your next mobile device. Retrieved September 5, 2017 .
  10. ^ Everything you need to know about how fast charging really works. Retrieved March 4, 2019 .