In the last few years a variety of rapid charging systems have developed that accompany smartphones. One of the companies that has dabbled in this field is OPPO with its fast recharge called VOOC.
How does the quick charge work?
The basic principle of a charging system present on a smartphone is very simple. Everyone knows that these devices are powered by lithium batteries, which, when the energy is exhausted, must be recharged. To do this, the smartphone must be connected to a charger. The latter, in turn, transmits energy to the battery.
The speed at which energy is supplied to the battery is measured in watt, so the higher the power and the faster the battery can be recharged. The power is calculated in watts which are measured by multiplying the current (measured in ampere) for the tension (measured in volt).
This means that when you take a look at the various writing on the battery charger you can see something like this: 5V / 2A, 9V / 2A and so on. Let's consider, for example, that a normal USB 2.0 port works at 5V and 0.5A, and this corresponds to 2.5W. A battery charger that works at 5V 2A therefore generates a power of 10W.
OPPO VOOC: fast charging that makes the difference
One of the main differences between the other systems of quick charging and the standard VOOC of OPPO is that the latter uses higher levels of current. So instead of 9V and 1.67A from 15 W, VOOC uses 5V and 4A to give 20W of power.
Another relevant thing to know is that the smartphone battery is recharged in two stages: during the first a high amount of power is used, reaching a percentage approximately 80%.
Instead, the second phase comes into play with a reduced power up to 100%, in order to safeguard the life of the battery.
Taking into consideration theOPPO F1 Plus, which has a unit as a battery 2850 mAh, the VOOC fast charge can give you energy from 0 to 75% in 35 minutes only, a really impressive figure.
From 0 to 90%instead, the hard recharge 45 minutes, while employing 1 9 hours and minutes to load it from 0 to 100%. Below you can see a chart about the progress of the recharge.
One of the factors that can damage batteries the most is the heat. It seems in fact that the higher the voltage used, the greater the heat produced, with an increase in temperature of about 8 ° C when charging the smartphone with this technology running at 9V.
But one of the most interesting aspects of VOOC technology is being able to maintain the low temperature. Below is a table showing temperature variations compared to other smartphones with different technologies.
As you can see, VOOC is able to recharge theOPPO R7s el 'F1 Plus with higher rates of charge (mAh per minute), but maintaining the temperature between the 3 and the 4 ° C.
Some of you will surely have found yourself in the situation of watching a video, or playing on your smartphone, while the phone is charging, and you will have noticed that the smartphone does not recharge quickly when connected to a charger.
The reason for this is that when charging the device using a fast charging system, heat is produced in the same way as described a few lines ago. However, when watching a video or playing games, another color is produced by the CPU and from GPU. This means that you will have two sources of heat inside, and consequently an excessive one overheating. Consequently, the terminal will no longer operate in fast charging, but will switch to the standard charging system in order to avoid problems, with the result that the device will recharge slowly.
However, one of the characteristics of the VOOC system is that it can recharge the smartphone while watching a video at a reasonable rate.
Normally, the OPPO R7s employs about 81 minutes to recharge with respect to Galaxy Note 5 that requires about 97 minutes, proof made by watching a video on YouTube. During the charge and the video playback, L 'R7s it recharged itself exactly at the same time, therefore 81 minutes, while the Notes 5 he asked 160 minutes, that is the 65% more.
As a second test, the Galaxy Note 5, Mate 8 el 'F1 Plus, discharge the batteries and bring them about to 4-5% for a charging test during a session streaming.
However, before discovering the results, it is important to remember the size of the batteries of these devices:
- Huawei Mate 8: 4000 mAh
- OPPO F1 Plus: 2850 mAh
- Samsung Galaxy Note 5: 3000 mAh
After 30 charging minutes while playing a video on the Notes 5, the battery has recharged 24%, Mate 8 has reached the 31% while theF1 Plus well the 68%. Taking into consideration the different battery capacities, it means that Samsung's phablet had added 600mAh, the Mate 8 1000mAh and the F1 Plus 1824mAh.
In conclusion, we can summarize that the standard VOOC is a system of fast charging leader in the industry.