Every time want to help mobile phones, computers, or other kinds of electrical charge, always pick a charging line, charging line one more, and often wrong, very troublesome really. Fortunately, more and more electronic products, are now beginning to use the wireless charging technology! As long as the phone on a small, elegant like coasters things above, not wiring can charge easily, so much of what is behind the technology principle? Let's explore it.

The interaction of the electricity and magnetism

Generally see the wireless charging, using the current magnetic effect and the principle of electromagnetic induction. Observed in 1819, Danish scientists, if on a wire, a current will produce a magnetic field, can make ones deflection. Posterity is further found that will lead into ring, even around into a coil, the magnetic field will be more and more concentrated, which is referred to as a current magnetic effect.

As for the electromagnetic induction, is by Faraday discovered in 1831. Make a magnet or other source of the magnetic field near a no current coil, coil can produce induced current, is called electromagnetic induction. It is worth noting that the establishment of the electromagnetic induction magnetic field are the main points to have change, such as the magnet becomes more and more close to the (more and more far away from also can actually). If plus magnetic field remains the same, there would be no induced current.

Current magnetic

In a nutshell, magnetic current is the flow of current in a magnetic field around, electromagnetic induction is changing along with magnetic field coil current is induced.

Using electromagnetic induction to charge

These two kinds of physical phenomenon at the same time use, it can be for wireless charging. Current wireless charging equipment, contains a charge, in fact it is inside the coil. Will charge after receiving household plug, can produce magnetic field due to the current magnetic around the coil. To charge electronic products, also has a coil inside, when it is close to charging, charging a magnetic field by electromagnetic induction, induced current on the coil of electronic products. Induced current leads to the battery, charging completes the wireless charging, and electronic products.

You may ask, is there any electromagnetic induction magnetic field is not to change to? But with battery of object distance but always remains the same, so why have induction? Originally, household electricity is alternating current (ac) from the outlet of the socket, that is constantly in the direction of the current change alternately, a moment along the stream, a moment against the flow. Because of this, charging coil of the magnetic field generated an accompanying at changes of direction, not stay the same, meet the requirements of the electromagnetic induction.

Recently, more and more smart phones, tablets, began to provide wireless charging function, but unfortunately, they charge, as long as some farther from the distance of the charging, charging efficiency will be significantly lower. Even with the latest technology, charging distance cannot be more than 5 cm, in fact, currently the vast majority of wireless charging of mobile devices, are completely flat on the charging seat for, as you go, and imagination in the charge of wireless charging is still a little difference.

Use of resonance charging long distance

In order to increase the distance of wireless charging and charging efficiency, scientists are trying to use the principle of magnetic resonance imaging (mri) for wireless charging. In a circuit to add some special elements such as capacitor, inductor, the appropriate connection, will form a resonance circuit. It's like musical instrument line will be some tuning tool ─ ─ a tuning fork. Tapping at a time, a tuning fork it can vibration for a period of time, in the same way, the resonant circuit electricity, short circuit also can produce in a period of time.

A tuning fork with resonance this interesting physical properties. Each have their own voice frequency, a tuning fork when a tuning fork vibratory sound, if there is another voice near the same frequency tuning fork, even if it is not directly by percussion, vibration will follow. A tuning fork resonant reached an energy transfer, so to speak. Resonant circuit resonance, two vibration frequency of the same resonant circuit is put together, when one started to oscillation for electricity, will follow another circuit oscillation, automatically generate an electric current, power will be transmitted from a distance. Such a phenomenon called magnetic resonance (NMR), used for wireless charging, can make a charge to reach a total distance of a few meters, efficiency is also improved. The only difficulty is to adjust the two circuits to the same frequency, and to maintain a period of time, is not easy.

In addition to magnetic resonance (NMR), scientists have tried to borrow by laser beams of light energy to recharge, and even electricity through and home Wifi network similar to the airwaves to transmit. Hope these technical breakthrough, can make our future more convenient when in charge!

Represented by apple, samsung, zte and other companies in the field of consumer electronics, electric vehicles to the practice application of wireless charging will accelerate billions of market opening. Recently, media reports said, although after iphone7 has a wireless charging function prediction does not implement, but 2017 apples also will be the big probability has a wireless charging function, at the same time, according to the current enterprise layout wireless charging, 2017 wireless charging is not only a breakthrough in the field of consumer electronics, in the field of domestic electric car, wireless charging is also the bigger development opportunities. Prospects for wireless charging is infinite, then scan of wireless charging technology together!

1, ultrasonic wireless charging: effective range nearly five meters

A company named uBeam invented a new kind of wireless charging mode, can make use of ultrasound to transfer power distance to 15 feet (4.6 meters). With such products, as long as a dedicated wireless charging set, you can walk about in charge while holding a mobile phone in the house. Although uBeam prototype is relatively heavy, but the company is trying to narrow the volume, the market as soon as possible. It is understood that there have been several companies hope to achieve with uBeam strategic cooperation, to provide customers with the wireless charging service from a distance, in order to attract more passenger, including starbucks, virgin Atlantic, starwood hotels and many fast food chain. In addition, uBeam also communicate with hardware manufacturers such as apple and samsung opened.

Venture capitalists seem to see the opportunity: people familiar with the matter said the company hopes to seek a total of $50 million B round of financing, valuation could reach or exceed $500 million. But uBeam declined to comment. The company in October last year acquired by Upfront Ventures led A $10 million round of funding, had received before Andreessen Horowitz and raised Fund companies such as seed investment $3.2 million. There are a lot of companies have tried before real wireless charging, but most of them failed, finally only magnetic resonance charging. This equipment must be close to the transmitter, and direct contact with the transmitter, so not a plug-in charging achieve a major breakthrough.

UBeam early prototypes

UBeam early prototypes

Many big-name investors endorsement, however, shows that uBeam wireless charging mode may have great potential. Specifically, uBeam ultrasonic transmission technology is used the emitter through socket or building in electric power system, and then convert them into ultrasound, will shake again to the built-in receiver equipment, equipped with wireless charging set of mobile phones, for example, after the receiver is responsible for converting ultrasonic vibrations into electricity, charging for mobile devices.

UBeam said, this kind of mode of charging speed similar to direct use of traditional power supply.

This way of ultrasonic distance charge has several advantages. First of all, this technology is very safe, it USES the ultrasonic and monitoring of fetal ultrasound is similar. In addition, the price of the receiver is also very cheap, only about $50 or less, and small size. Not only that, the ultrasonic wave can also be used to transfer data, thus uBeam can also play a role in the field of Internet of things.

UBeam principle diagram of the model

But the most ordinary users also lies in the fact that this technology the effective range of about 15 feet, for the mobile devices is also effective. Although smartphones have achieved significant progress on volume and performance, but doesn't get too big change, battery life which not only hurt the user experience, also hindered the development of the whole mobile economy. Therefore, uBeam technology may be formed to promote to the whole industry. Apple and samsung technology giants are trying to solve the problem of charge, but it has no progress. As a result, they may approach uBeam. Since uBeam hold several important wireless charging patents, these giant may be at a premium to take over the company, to avoid the important technology fell into the hands of competitors.

In the long run, if the wireless charging uBeam agreement does achieve its potential, means that the wire will gradually disappear. Is not only a mobile phone, other kinds of electric equipment will also use the technology. To be clear, uBeam still overcome some serious technical challenges, the final product may not be able to on price, power, speed and security meet expectations. However, if really can achieve market expectations, will become a revolutionary technology, this also is the result of investors' dream.

2, the new technology of wireless charging: Microsoft intends to use focus light to charge

If you have a smart phone, in the case of the battery during the day, people will feel worry, most people's solution is to try to remember to recharge their equipment in the evening. Even in so doing, sometimes not enough people for daily use, charging is necessary, sometimes all day for the Microsoft research has worked out a potential solution: AutoCharge.

Microsoft researchers describe AutoCharge is a kind of automatic positioning of smart phones on the table, and recharge their technology. They made the prototype of the charger can be installed on the ceiling, there are two working module: a monitoring module, its use is Microsoft's device camera, can scan objects like smart phones; Another is charging mode, used the UltraFire CREE XM - L T6 to focus on the LED light.

The AutoCharge system based on image processing was used to monitor and track the smart phone on the desk, and automatically recharge smartphone. Charger will continue to rotate until it detects an object looks like smart phones, will use solar energy power generation technology of beam after recharge smartphone remote. In other words, without wires.

AutoCharge LED and smart phone or a mobile phone via bluetooth connection is established. This ensures a full battery when later can stop charging, and ensure that the size and shape objects cannot be similar to that of the smart phone charge. The system in object recognition to occur between it and smart phones, cause interference to recharge, can also be automatically closed within 50 milliseconds.

4.0 + Internet of things "pry" industry chain this door!

In the Internet of things what are you waiting for! Focus on the Internet of things "new opportunities for you, how can miss this feeling feast!! By huaqiang poly feng's electronic enthusiasts network at the third session of" China IoT conference "was held in shenzhen on December 2: global perspective, the higher value of exclusive viewpoint, more professional technology sharing, the pulsation of the frontier, together global Internet of well-known enterprises and the elite of festival, you must not miss! For more information welcome to continue to focus on electronic enthusiasts network!"