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Saturday 7 January 2017

Qualcomm quick charge explained

Quick charging has been a necessity in the recent times as the time it takes to charge our phones is very less as compared to conventional charge. Also in this fast paced world , charging devices consisting of a mammoth battery with a conventional charger is a pain. Imagine having 5000 mAh battery and the supplied charger is of just 1 Amp, indeed theoretically it will take 5 hours for full charge but practically its even more.
In order to avoid these circumstances, Qualcomm did introduce quick charging which comes along with its SOC and hence debuted with their quick charge 1.0 in 2013.
It was used in a variety of devices back then and was quite fast in charging time ( if the charging time was 4 hrs by conventional charger, it would take about 3 hrs to charge as claimed by Qualcomm)

Quick charge 1.0 vs Quick charge 2.0 :

The QC 1.0 was able to charge with 10 watts of power. It was able to draw the current of 2 A with 5V voltage. It was capable of using the normal USB cables provided and was initially used in Snapdragon 600 processor.

The QC 2.0 was a much higher leap as it could work with multiple voltages of 5V , 9V and 12V. Considering charging our devices with 5V supply , it could harness a current of 3A therefore increasing power to 15W. Hence, more power means lesser time to fill the mAh ratings of your battery.
However with QC 2.0 special components were required to withstand higher power.

Quick charge 3.0 :

The quick charge 3.0 is quite similar to 2.0 however it has an additional feature called as INOV ( intelligent negotiation for optimim voltage ). As the full form goes, it monitors the voltage while charging. Unlike 2.0 where the ratings were 5V at 2A , 9V at 2A, 12V at 1.67A, quick charge 3.0's INOV monitors the conditions which takes into account heating and operates in the range from 3.2 V to 20V by incrementing the voltages by 0.2 V
It dynamically adjusts the ratings and during charging the battery initially draws more current because of which it charges at higher rate and charges quick. As charging progresses INOV monitors the temperature and other conditions and hence the battery draws lesser current. This is the main reason that the first 80% charge is usually faster and the last 20% takes more time.

While using quick chargers heating does take place which is quite common.

It was included in 820, 430, 617,616 SOCs

Quick charge 4.0 was recently announced and it is included along with the Snapdragon 835 SOC.


Mors details about quick charge 4.0 will be included in the next article. Do stay tuned to claivtech for more.

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