I believe everyone still remembers the advertising slogan of a certain mobile phone a few years ago: "Charge for five minutes, talk for two hours." Since then, mobile phone "flash charging" and "fast charging" have mushroomed in various mobile phone brands in recent years, and even two-hour fast charging technology has appeared in the field of electric vehicles. What are the advantages of fast charging over regular charging? Does it have any impact on the life of the mobile phone? Let’s take a look at a simple chart first, and then listen to Little Gray Dot’s analysis: Fast charging has obvious advantages. Little Gray Dot once observed the latest mobile phone from a foreign country, using the original 5W and the officially sold 30W “fast charging” power supply. adapter for charging. When charging for 15 minutes, the 5W charger only charges 9%, and the 30W charger charges 22%. At 30 minutes, the 5W charge was 16%, and the latter soared directly to 51%. When fully charged, the 5W battery took 4 hours and 3 minutes, and the 30W battery took 2 hours and 13 minutes. In this era where the pace of life and work is accelerating and time is fragmented, there is a wide demand for fast charging. Many times, when we are on a business trip or doing errands, our mobile phones are almost out of power. We only have 30 minutes of charging time. The advantages of fast charging are reflected. 50% of the power is enough for us to use it calmly before we find the next opportunity to charge. cell phone. So, what is the principle of so-called "fast charging" and "flash charging"? Charging so fast will cause damage to my phone? "Quick charging" and "flash charging" each have their own advantages and disadvantages. For example, charging an empty battery is like filling an empty swimming pool with a water pipe. There are two ways to speed up water filling: one method is to turn the faucet larger to increase the water flow speed in the water pipe; the other method is to keep the water flow speed unchanged and use a thicker water pipe for water filling. Let’s take a look at “flash charging” first, which is the second water filling method, directly increasing the charging current, just like directly increasing the diameter of a water pipe. This method delivers 4A at a voltage of 4.2V to 5V, compared to 1A or 2A for a typical charger. For a certain brand of "flash charging" power adapter, you can see that the output voltage and current are 5V and 4A respectively. The advantage is that it does not put a lot of pressure on the "swimming pool", there is no need for secondary voltage conversion in the mobile phone, and the requirements for the mobile phone charging circuit are not very stringent. Currently, mobile phone batteries can withstand larger currents without affecting battery life and the phone. The disadvantage is that low-voltage "flash charging" technology is currently in a closed state of independent research and development among manufacturers. There is no unified industry agreement, and user convenience and development costs are both issues. This means that "flash charging" needs to be customized from the adapter to the circuit and the battery, which is relatively expensive. The little gray dot spent 100 yuan to buy a "flash charge" charger. The current domestic representative technologies of "flash charging" include OPPOVOOC flash charging (the one that "charges for 5 minutes and talks for 2 hours"), Huawei SuperCharge and FastCharge (the one that Xiao Huidian bought for 100 yuan). ▲TypeC interface, commonly used in "flash charge" chargers. Most of the best-selling mobile phones on the market are now equipped with Type-C interfaces as standard, and many new laptops are also equipped with Type-C interfaces. The advantage of this interface is that it can be plugged in both front and back. The dustproof and waterproof performance is much better than that of ordinary interfaces. Higher currents can be transmitted, which means charging time can be shortened. Another point is that the TypeC interface fully supports USB3.1, which is a big leap in transmission speed. Let's take a look at "fast charging". This charging method is relatively simple and crude. It increases the adapter voltage and charges with 9.2V voltage. Just like the first filling method, increasing the faucet pressure makes the water flow faster. The advantage is that it is a little cheaper than "flash charging". The disadvantage is that the 9.2V voltage needs to be converted into 4.2V in the mobile phone, which can easily make the mobile phone hot. Heat is a killer for batteries and electronic components and will definitely affect their service life. After long-term use, the phone will not be fully charged and will restart without any reason when it is fully charged. This technology has little room for advancement in the future. The current domestic representative technologies for "fast charging" include QuickCharge1.0 and PumpExpress. In the future, mobile phone "flash charging" technology will become more and more perfect. It is the general trend to form a unified agreement in the low-voltage "flash charging" industry in the future, which will also solve the problem of user convenience and development cost. ▲ "Flash charging" power adapters can be seen everywhere on the market. Of course, you may have thought that instead of increasing the diameter of the water pipe, you can use the method of adding a few more water pipes, so as to combine the advantages of the two "water filling" methods. ? This technology is already under research and development, such as QuickCharge2.0 charging technology, which is an upgraded version of QuickCharge1.0. It increases charging speed by increasing current and voltage at the same time. A special chip is added to prevent damage to the battery caused by increasing the voltage. In order to prevent older versions of mobile phones from being burned by excessive current when charging, a special IC judgment switch is also added.

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