Smartphone screens are getting bigger and bigger, and mobile phone applications are getting more and more, resulting in insufficient battery life. The increasingly thin and light smartphones, coupled with the increasingly heavy charging treasure, are not a bit funny. In this context, the concept of wireless charging, which has been YY for a long time, is becoming more and more tempting. Imagine that when the smartphones in the future support wireless charging, when we go to the restaurant, we must ask the waiter's sentence in addition to "How much is your WiFi password here?" Is it necessary to say "Do you have a wireless charging base station here?"
This future seems to be getting closer. In April 2011, Sharp released the mobile phone sh-13C with wireless charging function, and then Nokia's Lumia 920 made more people know about wireless charging of mobile phones. Counting down, today's mobile phones with wireless charging feature include Samsung Galaxy S6, Sony Xperia Z4v, Google Nexus 6, Nokia Lumia 930, and Putin's same YotaPhone 2 for Xi Da.
Three major problems hinder the popularity of wireless charging phones
A accessories are not convenient to carry
There are many reasons why wireless charging mobile phones are not popular. The inconvenient use is the first "big mountain".
As early as three years ago, Nokia introduced the Lumia 920 with built-in Qi wireless charging technology, and is equipped with a wireless charging board. Some third-party manufacturers have also introduced accessories that can be used for wireless charging, although the form looks very high. However, such equipment requires a special casing to be installed, which is not very convenient to use.
In terms of charging form, wireless charging requires a base, and the cost is too high. At the current price, I believe no one will buy a lot of charging bases. Imagine that every time you go out with a base that is thicker and bigger than your mobile phone, how can you enjoy the feeling of wireless charging? Unless the pedestal can become as portable and compatible as the data line, at least not as fast as it is now, there is a certain distance limit for charging, which of course may change with the development of technology.
B charging efficiency is far less than line charging
The second "big mountain" is a charging efficiency issue.
At present, no matter what standard wireless charging technology is adopted, there is a big discount in charging efficiency relative to the charging line. Nowadays, with the increase of the screen of the smart machine, the problem of insufficient battery life has become Increasingly, before the more mature battery technology is popularized, major manufacturers are making up for the problem of insufficient battery life by improving the charging efficiency of the charger. Under such a background, if a wireless charger and a charger can be quickly charged, The wired charger is in front of you, how would you choose?
C manufacturers standards are far from unified
The third "big mountain" is the standard war of the wireless charging alliance. At present, the most popular wireless charging standards in the world are Qi standard, PMA standard, A4WP standard and iNPOFi technology. Among them, Qi and PMA adopt magnetic induction technology, which requires high contact charging efficiency; A4WP adopts non-contact charging magnetic resonance technology, which can achieve wireless charging at a long distance but with low efficiency; and iNPOFi wireless charging products adopt smart electric Transfer wireless charging technology. At this year's CES, the A4WP and PMA camps will merge, and in the future, they will focus on integrating magnetic resonance and magnetic induction technologies to create a more uniform wireless charging standard.
All camps are striving for large-scale support from mainstream mobile phone manufacturers, trying to build their own wireless charging ecosystem, and strive to become the pioneer in the future wireless charging market. However, before the standard was unified, obviously no manufacturer was willing to support it. The early Palm tried, Nokia tried it, but everyone knows the result.
The charge of the mountain stone is not a dream.
Now, the “wireless charging†technology we mentioned refers to the fact that the phone can be charged on the charging pad without the need for a charging cable. But strictly speaking, this is not really "wireless charging". It is not like the WiFi signal, it is charged by the "air" medium, and you can't always charge the phone when using the phone.
A machine with 12 machines will be available as soon as next year
Engineers are developing long-distance charging technology in laboratories around the world and have made good progress. Developed by Energous in the United States, "Remote Charging Technology" is a special transmitter that enables devices such as mobile phones, tablets, smart watches, hearing aids and motion trackers to achieve this "space-free" charging. Throughout the charging process, you don't have to take the equipment off, you don't need to plug them in the socket, you don't even have to remember to charge them once a day.
How does this device do it all? In fact, during the entire charging process, the mobile phone obtains electric charge through "air". The transmitter contains a miniature RF antenna array that can transmit 23dBm over 120 degrees and uses a 5.8GHz unlicensed ISM spectrum to create a 3D energy space. In this way, the device can "collect" the energy as long as it is within the range covered by the signal. The device can charge up to 12 devices at the same time, with a maximum charge range of 15 feet (about 4.6 meters), in a range of 5 feet, the device can get up to 4 watts of power, 10 feet for 2 watts, 15 feet for 1 watt.
It is reported that the price of this equipment is expected to be 300 US dollars (about 1912 yuan). In addition, users also need to buy a mobile phone case that receives signals, and its price is around $75-$125 (about RMB 478-796). Energous said it has signed a partnership agreement with 16 manufacturers that will integrate their transmitters into refrigerators, televisions and WiFi routers. The device is expected to be available by the end of 2016 or early 2017.
In addition to mobile phones, all appliances are expected to be wirelessly charged.
In addition to Energous, Israel's Wi-Charge and the US WiTricity have also made good progress in different directions. Israel's Wi-Charge charging system utilizes infrared wireless charging technology. With this technology, you can charge all the devices in your room at the same time.
In the United States, WiTricity uses magnetic field resonance technology to achieve wireless charging. The longest distance is 2.4 meters, which can charge multiple devices at the same time, and can penetrate walls, wood and other obstacles. Resonance is a very common phenomenon in nature. As long as the two objects vibrate at the same frequency, energy exchange occurs. WiTricity technology makes use of this principle.
In any case, wireless charging will eventually become a major trend in mobile phones. On the one hand, it can liberate the last bond of the cable to the terminal, and make mobile life more free; on the other hand, as long as the standard is agreed, the standard dispute and resource waste of various chargers can be fundamentally solved. .
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