How to choose a mobile phone wireless charger
How to choose a mobile phone wireless charger
Supporters of wireless charging can't put it down, but other people question its slow charging speed and short charging distance. In essence, it still takes off their pants and farts. Whether you love it or not, you can't deny that wireless charging is really going to spread.
For wireless charging, our expectation is of course to be unfettered, charging anytime and anywhere in free space.
Of course, the ideal is very full, and the reality is very skinny. With the current technology, wireless charging does not have many advantages compared with wired charging. In addition to the convenience of charging without plugging in the cable, the charging speed is still not comparable to wired fast charging. It is comparable, and cannot meet the needs of some users for using mobile phones while charging.
However, for some users, wireless charging can already be played. In some scenarios where mobile phones are not frequently used, wireless charging can give full play to its advantages.
The technical principle of wireless charging
The core principle of wireless charging is based on electromagnetic induction, and the principle is not complicated. At present, the industry mainly has two technical branches, one is the magnetic field induction technology represented by the Qi standard, and the other is the magnetic resonance technology represented by the AirFuel standard.
In principle, magnetic resonance is a better solution. It supports a longer charging distance and can support multiple devices at the same time.
However, the magnetic resonance technology is not mature at present, and through the stacking of multiple coils, the use of Qi standard wireless chargers can also achieve simultaneous charging of multiple devices.
However, magnetic resonance is still the future development direction of wireless charging. Qi has also incorporated magnetic resonance technology into its standards. It can be seen that short-distance power transmission is not impossible.
Wireless charging devices on the market
At present, the wireless charging standard adopted by smartphones and consumer-grade wireless chargers on the market is mainly Qi. Therefore, as long as the mobile phone supports Qi wireless charging, theoretically all wireless chargers using the Qi standard are compatible (including those that are particularly difficult to service. iPhone).
However, different mobile phones and wireless chargers actually have different charging efficiency. For wireless chargers, generally only the input and output power will be listed, but for the mobile phone, the received power is the key indicator that determines the charging efficiency. In other words, the received power is about 75% of the output power.
Charging board end
At present, mainstream wireless chargers mainly use Qi's Basic Power Profile configuration, which supports 10W output. Counting the conversion rate, it is roughly equivalent to 5W~7.5W received power.
But this year, wireless chargers using the Extended Power Profile configuration standard have been born, which can support a maximum output power of 15W, which is equivalent to a receiving power of about 10W, which can greatly improve the wireless charging speed of mobile phones.
Since wireless charging boards have power limitations, mobile phones are naturally the same. At present, mainstream smart phones (most of them use Basic Power Profile configuration) support wireless chargers with output power of 5 to 10W.
For example, Samsung Galaxy S series mobile phones can support 10W wireless charging, while Apple iPhone 8/8 Plus and iPhone X can support 7.5W wireless charging. Of course, the received power will be lower.
In addition, smartphones that support the relatively fast wireless standard Extended Power Profile are also being launched this year. At present, there are familiar Sony XZ2 series and LG V30 series. The receiving power can reach about 10W, but it needs to be matched to also support Extended Power Profile configuration. Wireless charger.
In summary, different mobile phones require different specifications of wireless chargers, but for most mobile phones, a wireless charger that supports 10W output is sufficient. In addition, many wireless chargers do not necessarily come with a charging head and a data cable, and need to choose according to their input power and fast charging standards.
Although iPhone 8/8 Plus and iPhone X are compatible with the Qi standard, not all Qi wireless chargers can achieve 7.5W fast charging.
What should I pay attention to besides power?
FOD foreign body detection
FOD foreign body detection should be the most basic safety function of the wireless charger. When a metal foreign body is sandwiched between the mobile phone and the wireless charger, the wireless charger will detect and cut off the power to prevent the metal foreign body from overheating.
However, the FOD function cannot be judged by just looking at the promotional parameters. You can only see the specific performance through actual measurement. Most wireless chargers on the market are qualified in FOD foreign body detection.
The output power of the wireless charger is not constant, and the peak power mainly depends on the design material and heat dissipation method of the wireless charger. We recommend buying models equipped with active cooling fans. Although they are thicker, they generally output peak power. The time is also longer.
The maximum charging distance of the Qi wireless charger is about 10 mm, so it can be charged with a protective cover. It is not necessary to "take off" the phone to charge.
With the development and iteration of the Qi standard, the cost of wireless charging technology has slowly come down. There are more and more products of around 100 yuan, and the experience cost can be regarded as low. At present, Xiaomi and Huawei have begun to try to add wireless charging to its products. It can be expected that the wireless charging function will be more popular in the next two years.
It's not our style to talk about it. Next, we will cross-test some wireless chargers and smartphones that support wireless charging on the market, so stay tuned!
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