Let’s continue 

2. Disadvantages

Although wireless charging has many advantages, in actual use, there are also many disadvantages. Compared with wired charging, wireless charging has the following disadvantages.

, The distance is too small, just a transition technology

Because the magnetic field decays quickly in the air, the wireless charging technology of current mobile phones generally has a very small distance, and the effective charging distance is generally only 3-8 mm. Counting the thickness of the charger + mobile phone case + mobile phone protective cover, mobile phone charging basically needs to be close to the charger to effectively carry out wireless charging. This limitation is destined to be a transitional state of this wireless charging technology. The true wireless charging technology must develop in the direction of “air charging”. If it develops maturely, air charging will completely replace wired charging.

, Cannot play with the phone while charging

Most of the mobile phone wireless chargers on the market are placed flat, and the mobile phone must be close to the charger. In this charging position, it is basically impossible to play with a mobile phone, and you have to use a headset to connect and listen to the phone. Even if Xiaomi built a vertical wireless charger, it could not change this situation. For wired charging, although a cable is tied, it can move freely within a long range of the cable.
Low charging efficiency

Although wireless charging can be unplugged, the distance between the mobile phone and the charger is very small. However, the loss of electromagnetic energy is still not small. Generally, the power received by the mobile phone is about 75% of the power transmitted by the charger. At the same time, wireless charging power is generally low, and wireless chargers on the market are generally 15W. A small number of manufacturers have higher fast charging wireless chargers. The wired charging basically has no loss, the charging power is generally 40-50 watts of fast charging, and even a small number of manufacturers’ fast charging has exceeded 100 watts.

, There is electromagnetic radiation

Wireless charging of mobile phones is carried out by electromagnetic induction, so the charger generates electromagnetic waves all the time. This electromagnetic wave is generally in the frequency range of tens to hundreds of MHz. Although it may not cause much harm to the human body, it is still much more harmful than wired charging.

More expensive

Compared with wired charging for mobile phone wireless charging, both the charging head and the mobile phone need to add a charging coil and related protection circuits. At the same time, a high-frequency wave circuit is required to meet electromagnetic compatibility, so the overall price is higher than that of traditional wired charging.
to sum up

The above are the advantages and disadvantages of mobile phone wireless charging. In general, the advantages and disadvantages of wireless charging technology for mobile phones are now divided into half, which is a transitional technology. Space charging will be the future development trend