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The principle of wireless charging and the application of zi
Wireless charging has been around since 2007. It has got rid of the shackles of charging lines and can charge multiple devices at once, but in the past decade, wireless charging technology has not been rapidly promoted to the extent of popularity. There are many reasons for this.
 
The first is the cost and price factor. Not only does it require a dedicated charger, but it also requires a wireless charging module.
 
The second is the standard. The Wireless Charging Alliance was established on December 17, 2008, but it was not until February 2017 that Apple joined the alliance, although Samsung, Microsoft, LG, Philips, Nokia, and Sony were already in the league. , Wisepower, Texas Instruments and many other giants, but until Apple joined, the alliance covered most equipment manufacturers.
 
Nokia, Nokia Lumia 920 and Nokia Lumia 820, which used wireless charging technology on mobile phones, can be wirelessly charged, but these two phones are equipped with Windows Phone 8 system, which has only a few percentage points in the global market. Nokia The mobile phone department has long been the biggest player in the mobile phone market, so the influence of these two mobile phones is not that big.
 
In 2013, Samsung also released the first S3 mobile phone with wireless charging. Since then Samsung's flagship phone is basically equipped with wireless charging. The addition of Samsung has added new impetus to the popularity of wireless charging.
 
However, domestic mobile phone manufacturers do not seem so enthusiastic about the popularity. This is mainly because of the influence of patents. There is no mature wireless charging technology solution in China. If you buy a foreign solution, the cost is high. The impact of wireless charging was not as high as imagined until Apple released the iPhone 8 and iPhone X. Although Apple's mobile phone equipped with wireless charging is much behind, but Apple's influence is huge, it immediately led to the mass adoption of wireless charging. The latest flagship mobile phones are equipped with wireless charging.
 
Wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling, and radio wave transmission. Most of the wireless charging of mobile phones is electromagnetic induction technology.
 
IMG_256
 
As shown above, when the current of the power supply passes through the coil (the power feeding coil of the wireless charger), a magnetic field is generated, and other unpowered coils (the power receiving coil of the mobile phone end) generate a current close to the magnetic field to charge the mobile phone.
 
Advantages of wireless charging:
1. It is safer than wired charging and effectively avoids the risk of electric shock.
2, increased service life, the interface wear or damage failure will not appear again, but also eliminate the loss caused by mechanical wear and jumping.
3, wireless, now only need one line to attack the wireless charger, you do not need to occupy multiple power outlets, there is no trouble with finishing the line.
 
Disadvantages of wireless charging:
1, the efficiency is not high, slightly for the general charger.
2, the price is expensive, the cheapest wireless charging device that supports Qi standard, also needs more than one hundred yuan. This still does not calculate the price of the wireless charging template built into the phone.
 
Application of zinc alloy die castings in wireless chargers:
Since most of the wireless charging technologies use electromagnetic induction technology, it is necessary to consider the problem of preventing electromagnetic interference, and the device itself cannot be subjected to other interference, thereby ensuring the normal operation of the wireless charging device. Therefore, wireless chargers generally use zinc alloy die-casting parts as the base, which not only effectively shields the interference, but also increases the weight of the charging device and improves the metal texture.
IMG_257
 
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