In this era where everyone is inseparable from mobile phones, the battery life of mobile phones is becoming more and more important, and the emergence of fast charging technology greatly reduces the charging time of mobile phones, which is very convenient. With the advancement of technology, wireless fast charging has been applied to many flagship mobile phones, the first few such as iPhone 11 Pro, Samsung S20 series and OnePlus 8 series and so on.
Get rid of the data cable, how does the mobile phone achieve wireless fast charging? Is it true that wireless fast charging is rumored on the Internet to reduce battery life? Today we will answer it.
01 The principle of wireless charging of mobile phones
At present, there are four main wireless charging methods: electromagnetic induction, magnetic field resonance, radio wave and electric field coupling charging, and most of the wireless charging of mobile phones adopts the principle of electromagnetic induction. Therefore, we can directly discuss its charging principle.
Electromagnetic induction wireless charging, the wireless charging of our mobile phone, when the current of the power supply through the coil (the transmission coil of the wireless charger) will generate a magnetic field, the receiving coil on the mobile phone end close to the magnetic field will generate current to achieve mobile phone charging. At this stage, electromagnetic induction wireless charging can have a higher conversion rate than magnetic field resonance charging, so it is widely used in the field of mobile phone wireless charging.
In December 2008, Philips Electronics, Texas Instruments and other major companies joined hands to form the wireless charging alliance WPC to jointly formulate the wireless charging standard Qi, which is the world's most widely distributed and popular wireless charging standard so far. Because the unified wireless charging standard is adopted, as long as it supports the Qi protocol, the wireless charging function of different manufacturers' products can be universal.
The Qi wireless charging standard uses electromagnetic induction technology, so the biggest problem of this wireless charging standard is that the transmission distance is short, and the charging efficiency is easily affected by the placement position.
02 These are the factors that affect battery life
First of all, to be clear, wireless fast charging does not reduce battery life. So, why do many people think that wireless fast charging will affect battery life?
The biggest advantage of wireless charging is that it gets rid of the data line and charges as you go, so some netizens suspect that frequent charging and power failure will reduce the service life of the mobile phone battery.
This idea is wrong, the current mobile phone uses lithium batteries, lithium batteries have no memory effect (nickel-metal hydride batteries have a memory effect), "use and charge" is more conducive to maintaining the activity of lithium batteries, that is, do not use low power, do not charge too full.
Previously, Apple's official response to the "downclocking gate" explained that the iPhone's battery can retain up to 80% of the original storage after 500 full charge cycles, and after the battery storage is less than 80%, the power consumption will be accelerated and the performance will be affected. A single charge cycle of a mobile phone refers to the battery from full charge to complete consumption, not the number of charges.