Wireless Charging Has Been Around For A Long Time, But Why Are You Still Charging With Cable Now?

- Sep 07, 2018-

Today's smart phones have come to the era of full fast charging, charging power from 18W to 24W or even 40W, charging efficiency is getting higher and higher charging time is getting shorter and shorter. However, cable charging is still the mainstay of the charger, and wireless charging technology has been launched a few years ago. So why has wireless charging been launched for so long, and it has not been widely popularized yet?


    First of all, let's take a look at the current wireless charging. Wireless charging technology (English: Wireless charging technology; Wireless charge technology) is derived from the wireless energy transmission technology. The principle is that the charger and the power device can transmit energy with a magnetic field. There is no wire connection between the two, so the charger and The electrical device can be exposed without conductive contacts.


    At present, wireless charging can be divided into two modes: low-power wireless charging and high-power wireless charging. Low-power wireless charging is often performed by electromagnetic induction. Nowadays, wireless charging of general mobile phones is used. High-power wireless charging often uses resonant type ( Most electric vehicles are charged in this way. The power is delivered by the power supply (charger) to the powered device, which uses the received energy to charge the battery and simultaneously operate for itself.


    At present, there are two main types of mobile wireless charging solutions, one is magnetic field sensing technology represented by Qi standard, and the other is magnetic resonance technology represented by AirFuel standard. Due to technical efficiency and other reasons, most of the wireless chargers currently on the market are based on the Qi standard.


    Now let's talk about why wireless charging is not yet popular. Xiaobian believes that there are several reasons.


    Charging efficiency problem


    At present, the general commercial wireless charging technology has a power of about 10W, the iPhone 8 wireless charging power is 7.5W, the millet Mix2s wireless charging power is 9W, and the like. In contrast, the wired fast charging general thousand yuan machine can easily reach 18W, except for the iPhone, the general Android flagship machine has 24W fast charge or even higher, so a contrast can be clearly seen, many times I would rather charge faster than I would like to charge the wireless only.


    The current "wireless charging" is not wireless charging


    Once upon a time, we thought that wireless charging means that when you walk into a room with your mobile phone, you can charge it anytime, anywhere, without any operation. The commercial wireless charging that can be achieved at present is not "wireless" in the strict sense, but just to get rid of this step of plugging in the data cable. In exchange for wireless charging, you have to put your mobile phone close to you. On a fixed wireless charging board, then abandon the wired 24W fast charge to charge within 10W, and it can't move freely when charging, and it can't play mobile phone.


    High cost and high cost


    Another reason is that if you want to use wireless charging, you need to buy a wireless charger. Of course, the wireless charger is not cheap, and the expensive one is 7.800 yuan, so the cost is still relatively large. Although many manufacturers such as Xiaomi Meizu have launched a 99-yuan wireless charger, it is still more expensive than the wired 24W fast charging kit.


    In general, the reason why wireless chargers have been used for so many years but has not been popularized, and now almost always use the priority charging, because the current wireless charging technology does not exceed the wired charging in terms of standards, power, price, etc. There is no feeling that the user can feel that the step of inserting the data line can be exchanged for a better experience. However, I believe that under the impetus of Samsung Apple and other large manufacturers, wireless charging technology will develop more perfect, which will inevitably be the inevitable progress of the development of charging technology in the future.