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How often do you charge your cell phone?

In an era when smartphones were not yet popular, mobile phones played almost the only role of making calls. Once charged, it can be used for several days. (Oh, expose the age.)

Nowadays, from communication to entertainment, from work to study, mobile phone has changed from a single communication device to a ubiquitous and indispensable tool in life. Accordingly, one of the essential things for everyone every day is to charge their cell phones.

I believe everyone is aware that the charging speed of mobile phones is getting faster and faster. With the popularity of fast charging technology, "charging for five minutes and talking for two hours", which was once out of reach, is no longer a dream. So, what is the principle of fast charging technology? How does the charging speed of mobile phones get faster and faster?

If the mobile phone battery is compared to a pool and the current is compared to a current, then the process of charging the phone can be seen as the process of constantly injecting water into the pool. The capacity of the pool is fixed, so if you want to shorten the time to fill the pool, you need to increase the flow speed, that is, the charging speed, that is, the charging power.

Recall that we all learned this formula in junior high school physics:

Power P = voltage U * current I

Obviously, if you want to increase the charging power, you can start from the following aspects:

Increase voltage

Increase the current

Increase current and voltage at the same time

At present, several common fast charging technologies are as follows, which are based on this principle.

Quick Charge of Qualcomm

USB Power Delivery

VOOC Flash Charge

How did these fast charging technologies develop step by step? Let's find out together.

Qualcomm's Quick ChargeQuick Charge is a fast charging technology introduced by Qualcomm (Qualcomm), which achieves fast charging by increasing the voltage from the power adapter to the phone.

QC1.0 implements the fixed current and voltage technology of 5V / 2A, which has evolved to QC5.0.

The fixed current and voltage can not adapt to the different charging stages of the mobile phone, which is easy to cause power loss. By adjusting the charging voltage, QC2.0 and QC3.0 have developed from a fixed voltage to a gear of 0.2V, providing a flexible choice from 5V to 20V. The mobile phone can get the right voltage at different charging stages, reducing the power loss.

QC4.0 supports USB Type-C and USB-PD, charging voltages of 5V / 5.6A and 9V / 3A, and a 20% increase in charging speed.

The subsequent release of QC5.0 supports 100W charging power, which can be charged from 0% to 50% in 5 minutes when the phone is 4500 Ma. The charging speed is 70% higher than that of QC4.0, and the temperature is lowered, the safety is improved, and the battery life is prolonged.

USB Power DeliveryUSB PD is a general charging protocol, which uses the initial low charging power (5V 900mA) to adjust the output power configuration through negotiation to achieve the purpose of fast charging.

What do you mean? Take Chestnut: when we get home in the heat, the first thing we do is to turn on the air conditioner. However, excessive temperature difference may stimulate the body, so we first turn on 27 degrees to let the body adapt to the ambient temperature, and then adjust the air conditioning temperature to 20 degrees. After a period of time, 20 degrees may cause physical discomfort, and we raise the temperature of the air conditioner to 23 degrees and finally stabilize at 23 degrees.

USB PD supports the mobile phone to intelligently adjust the output power similar to the air conditioning temperature according to the charging demand. The latest version of USB PD can provide up to 100W of power.

VOOC Flash ChargeVOOC Flash Charge is a fast charging technology independently developed by OPPO, which adopts the charging mode of low voltage and high current, which effectively avoids the serious heating problem of the charging head in the high voltage and low current scheme, can provide more electricity for the mobile phone in a short time, and effectively ensures the stability and durability of the mobile phone.

However, in order to support low-voltage and high-current solutions, VOOC Flash Charge technology requires custom adapters and charging lines, which are not compatible with other mobile phone charging devices.

As we mentioned earlier, the process of charging a mobile phone can be seen as a process of constantly injecting water into the pool. Just as the flow of water too fast can spill out of the pool, fast charging technology can lead to overheating or even damage to the battery. Therefore, a mechanism is needed to ensure that the battery will not be damaged during the fast charging process, which is the safety mechanism in the fast charging technology, which monitors the status of the battery and slows down the charging speed to ensure the safety of the battery if the battery is overheated.

In addition, the fast charging technology is also like the principle that the water flow is fast first and then slow. At first, the current was very fast, and the water level in the pool rose rapidly. But when the pool is nearly full, it slows down to prevent the water from overflowing. Similarly, when the battery is low, the fast charging speed is very fast, but when the charge is close to full, the charging speed will slow down to protect the battery and extend its service life.

Both the development of mobile phone function and the evolution of fast charging technology are all in order to provide more convenience to our life. Understanding the different principles and safety mechanisms of fast charging technology can help us to better choose appropriate equipment and fast charging scheme, so as to better protect the health of the equipment.

This article comes from the official account of Wechat: ZTE documents (ID:ztedoc)

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