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Home > New Gear > Redmi K20 (Pro) is Pocophone F2 (Pro)?
Redmi K20 (Pro) is Pocophone F2 (Pro)?

Redmi K20 (Pro) is Pocophone F2 (Pro)?

By  Daniel Camilo 2019-06-01 942 0

Redmi, a brand of Xiaomi, has just launched K20 and K20 Pro in China. Recent rumours indicate that they could arrive in Europe under a different name and brand. Would they be called Pocophone F2 and F2 Pro?

Xiaomi is diversifying its offer of IoT devices and smartphones by presenting a myriad of new dedicated brands. We have Mijia, Yi Technologies, Pocophone and the recently announced Redmi brand that bears the name of Xiaomi's mid-range smartphone range.

Redmi immediately demonstrated its ability to introduce phenomenally priced smartphones to the market, such as Redmi Note 7 and the company's new flagship product called K20 and K20 Pro. However, although the brand is officially present in Europe, it seems that the two new smartphones of the K series could be introduced on the old continent not only under a different name, but under a different brand!

The source indicates with almost certainty the arrival of smartphones under the name of Pocophone F2 and Pocophone F2 Pro. The Pro version will be the one equipped with SoC Qualcomm Snapdragon 855 while the base model will use the least powerful but still very good Snapdragon 730.

This is certainly an interesting choice since the two new Redmi K20, and the emphasis on excellent performance and battery life, aims to surprise with an elegant design, capable of attracting attention. In fact, it's the opposite of what Pocophone F1 offers, by not taking too much care of the design to put only what really matters in the hands of users.

Would you like Pocophone F2 and F2 Pro to be the phones that Redmi K20 and K20 Pro or would you prefer an evolution of the Pocophone F1?

Fast charging is very popular on mobile phones, and this is normal: it is the workaround solution found to compensate for the lack of battery evolution. In order to charge these smartphones with a simple 1A charger with 5W, manufacturers offer chargers capable of delivering more power.

We have already seen devices capable of absorbing up to 25 W, which is almost five times faster than the common 1A x 5 V charger. Before going into more detail on the subject of fast charging, let's take a quick look at how electricity and units of measurement work within chargers.

Fast chargers

If you take a look at your charger, you can easily calculate its output power, expressed in watts. The chargers specify the current intensity (in amperes) and voltage (in volts) at the output, for the smartphone. To calculate the charger's power, in watts, simply multiply the current by the voltage. For example, in the case of a conventional charger capable of delivering a current of 1 ampere on 5 volts, we will be allowed 5 watts at the output. On Oppo Vooc chargers that deliver 5 amperes on 5 volts, the smartphone can receive 25 watts. What is the purpose of a greater power? To reduce the charging time of smartphone batteries.

To better understand the rest of the article, it should be noted that the charging time of a battery is not linear. Thus, if half of the battery can be recharged in a very short time, the other half - and even more the last percents of it - takes a long time to recharge. The fast charge therefore consists in sending a very high power to the first half of the charge, then finely regulating this power to the second half. This last exercise is the most delicate, in order not to damage the battery.

For safety reasons, batteries compatible with fast charging must also incorporate much thicker separators than conventional batteries between the anode and cathode. The greater thickness of this separator logically causes an increase in the size - but not the capacity - of the battery. As a result, for the same volume, manufacturers must choose between a battery with a larger capacity but no quick charge or a lower capacity but with a quick charge.

Qualcomm Quick Charge

Technical specifications

Tension

Current

Max. power

Quick Charge 1.0

5V

2A

10W

Quick Charge 2.0

5/9/12V

1.67/2A

18W

Quick Charge 3.0

3.6 to 20V

2,5/4,6A

18W

Quick Charge 4.0+

3.6 to 20V or 5/9V (USB PD)

3.6 to 20V or 5/9V (USB PD)

27W (USB PD)

History of the event

In June 2012, Qualcomm acquired Summit Microelectronics, a company specializing in the design of electronic circuits for chargers. In February 2013, the Quick Charge 1.0 standard was born, capable of reducing the charging time of compatible smartphones by 40%. To do this, smartphones had to be equipped with a special chip. In practice, the standard allowed the use of a 10-watt charger (5V - 2A) with compatible smartphones. Next comes the Quick Charge 2.0 standard, which this time can reduce the charging time of a smartphone by 75% with up to 36 watts (12V - 3A). To benefit from a 3A current, you need a special Quick Charge charger.

At the end of 2015, Qualcomm launched revision 3 of its Quick Charge standard, with once again a reduced recharging time. This time, it is possible to use a voltage of 20 volts against a maximum of 12 volts for Quick Charge 2.0. Qualcomm has gone even further by integrating finer voltage management, in 200 mV steps between 3.6 and 20 V. Previously, a smartphone could only choose four different voltages depending on the progress of the charge, compared to 80 voltages today. It is thanks to this finer voltage management that the charge is faster, allowing the power delivered to the smartphone to be refined as much as possible during the last minutes of charging. Qualcomm promises 71% charging in 30 minutes for a battery with a capacity of 2,750 mAh.

Now you can count on Quick Charge 4.0. While it is not yet widely adopted on smartphones, its evolution is interesting. It maintains the advances of version 3.0 while offering superior optimization, promising a 20% faster load for 30% more efficient energy management. The INOV algorithm has been revised to better consider the heating of the device and the power supply unit by dynamically adapting to it. The most important thing to note is that Quick Charge 4.0 is now compatible with the free USB Power Delivery standard, which promises to make QC4 chargers compatible with any device that supports it.

In 2017, a revision of this technology will have been launched, under the name Quick Charge 4+. This once again improves performance with an announced load up to 15% faster and up to 30% more efficient for a more optimized heating once again. Above all, the block and smartphone temperatures are monitored at the same time. No smartphones are currently taking advantage of this.

Charge OnePlus Dash / Warp Charge

Technical specifications

Tension

Current

Max power

Dash Charge

5V

4A

20W

Warp Charge 30

5V

6A

30W

History of the event

With its OnePlus 3, the Chinese brand has innovated in terms of fast charging with its in-house Dash technology. Under this name is a fast charge that looks like Oppo's, with a voltage of 5 volts, but an intensity of 4 amperes, which gives a final power of 20 watts. Once again, we benefit from the advantage of a low voltage (low heating) with the advantages of a fast charge. On the other hand, as at Oppo, the fast Dash charging requires a special USB cable, again with more pins for charging. OnePlus promises 63% of the OnePlus 3's battery capacity (which is 3000 mAh) in 30 minutes of fast charging.

Since 2018, OnePlus has been forced to abandon the name "Dash Charge" for legal reasons. For the OnePlus 6T McLaren Edition, the brand has switched to the "Warp Charge 30" which offers, as its name suggests, a power of 30 W. To do this, OnePlus offers a current of 6V and a voltage of 4A.

Oppo VOOC

Technical specifications

Tension

Current

Max. power

OPPO VOOC

5V

5A

25W

OPPO Super VOOC

5V

10A

50W

History of the event

Oppo has also created its own fast charging solution called VOOC. Unlike Qualcomm's solution, Oppo did not choose to increase the voltage, only the current intensity. VOOC can therefore deliver 25 watts, with 5 amperes and 5 volts. The advantage of using 5 volts and not 12 or 20 volts is to avoid that the battery gets too hot during charging, and therefore to use the phone without burning itself. Oppo also uses its own batteries, integrating several cells to optimize the current. Finally, the USB cable used by Oppo is special, since it includes more connectors. Oppo announces 30 minutes to recharge 75% of a smartphone battery, of unknown capacity.

In early 2016, Oppo announced the Super VOOC Flash Charge, which would allow a 2,500 mAh battery to be recharged in just 15 minutes. The charger always uses a voltage of 5 volts, but with a pulsed recharge, which allows the total power to be precisely varied over the entire charging time. Oppo also points out that a brand new battery is being used to go hand in hand with this technology, which is not yet available on smartphones.

Finally, in 2018, Oppo launched the Super VOOC on its Oppo Find X, also on the Oppo RX17 Pro. Thanks to its 50W power, it is possible to recharge the Oppo Find X in only half an hour.

Samsung Fast Charge

Technical specifications

Tension

Current

Max. power

Samsung Fast Charge

5/9V

2A

18W

History of the event

At Samsung, we have the Adaptive Charge, which acts as a fast charger. Thus, the charger delivered with the Galaxy S7 can deliver up to 25 watts with 12 volts and 2.1 amps. Once again, Samsung is using Qualcomm's Quick Charge technology as assigned to us by a San Diego company engineer at CES 2016. According to Samsung, the Adaptive Charge can recharge 50% of the Galaxy S7's battery (3000 mAh) in 30 minutes.

However, in 2019, Samsung is still delivering 15 W chargers with its Galaxy S10.

Huawei SuperCharge

Technical specifications

Tension

Current

Max. power

Super Charge 1.0

5 to 9V

2A

10 to 18W

Super Charge 2.0

10V

4A

40W

History of the event

At Huawei, the fast charging technology is called SuperCharge. By 2016, the manufacturer will have 10, 15 or 18 W chargers with a voltage of 5 or 9 V and a current of 2 amperes. Over the years and generations of smartphones, the technology has evolved to reach up to 22.5 W (5V for 4.5 A).

With the Mate 20 Pro, the company launched the SuperCharge 2.0 with a power of 40 W (10 V, 4A), allowing to recover 70% of autonomy in about 30 minutes. A feat that borders on the results of Oppo's Super VOOC.

Motorola TurboPower

Technical specifications

Tension

Current

Max. power

TurboPower 15

9/12V

1,2/1,67A

15W

TurboPower 25

5/9/12V

2,15/2,85A

25W

TurboPower 30

5V

7,7A

28,5W

History of the event

Motorola also offers its own technology called TurboPower. It appears to be based in part on Qualcomm's Quick Charge 2.0 standard since the charger is compatible. However, Motorola says its engineers have worked with battery designers to optimize charging. The software part would also be specially dedicated to the battery, for better energy management during charging. Most high-end Motorola smartphones come with the TurboPower 25 adapter, which delivers 25 watts of power at 12 volts and 2.15 amps. Motorola announces 1000 mAh of charging in 15 minutes.

It should be noted that most Motorola smartphones now take advantage of this, even at the entry and mid-range levels. This is particularly the case with the Moto G6.

MediaTek Pump Express

Technical specifications

Tension

Current

Max. power

Pump Express 2.0+

5 to 20V

3/4,5A+

15W

Pump Express 3.0

3 to 6V

5A+

25/30W

History of the event

For its part, MediaTek has developed its own fast charging solution called Pump Express. It is available in three different versions: Pump Express Plus, Pump Express Plus 2.0 and Pump Express 3.0. This latest revision should be available on smartphones by the end of the year. It is reserved for smartphones with a USB Type-C connector with an output voltage of 3 to 6 volts (in steps of 10 to 20 mv) and a current that can exceed 5 amperes. We can therefore increase to about 30 watts, with a low heating thanks to the low voltage. MediaTek announces 75% recharge in just 20 minutes for a battery with a capacity of 2,060 mAh compared to 30 minutes for the Pump Express 2.0 standard.

USB Power Delivery

Technical specifications

Tension

Current

Max. power

USB 3.1 (USB C+ USB PD)

5 to 20V

0,5/0,9/1,5/3/5A

100W

History of the event

The introduction of Type-C USB connectors on smartphones has increased the recharging speed of phones without fast charging features. For example, the USB Type-C connector allows 15 watts of power to pass between the smartphone and the charger, with a current of 3 amperes and a voltage of 5 volts. We are therefore staying on a load that does not heat up too much, but is much slower than Qualcomm, MediaTek or Motorola's mechanisms.

In addition, the USB 3.1 standard will also have finally powered USB Power Delivery. This universally applicable standard is capable of varying voltage and current to achieve a maximum power output of up to 100 W. It is designed so that a single charger can be used for a smartphone, fast charging or not, as well as a laptop computer.

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