Detailed wireless charging principle and the latest charging technology

Views:3     Author:Site Editor     Publish Time: 2018-03-24      Origin:Site

The interaction between electricity and magnetism

The wireless charging that is generally seen uses the principle of current magnetic effect and electromagnetic induction. In 1819, the Danish scientist Öster observed that if there was a current on a wire, a magnetic field would be generated around it, allowing the north needle to deflect. Later generations further found that by surrounding the wires in a loop and even winding them into a coil, the resulting magnetic field would be stronger and more concentrated. This is called the magnetic effect of the current.

As for electromagnetic induction, it was discovered by Faraday in 1831. When a magnet or other magnetic source is brought close to a coil without current, an induced current will be generated on the coil, which is called electromagnetic induction. It is worth noting that the main point of electromagnetic induction is that the magnetic field is subject to change. For example, the magnets are getting closer and closer (more and more away from it). If the applied magnetic field remains constant, there will be no induced current.

In a word, the magnetic effect of the current is that the flow of electric current generates a magnetic field around it, and the electromagnetic induction is a constantly changing external magnetic field that causes the coil to induce current.

Use electromagnetic induction to charge

 

When these two physical phenomena are applied at the same time, wireless charging can be performed. Current wireless charging devices include a charging stand, which is actually a coil. After the charging cradle is connected to the household plug, a magnetic field is generated around the coil due to the magnetic effect of the current. The electronic product to be charged also has a coil inside. When it is close to the charging base, the magnetic field of the charging base will be transmitted through the electromagnetic induction to generate an induced current on the coil of the electronic product. The induction current is led to the battery and wireless charging between the charger and the electronic product is completed.

You may ask, the magnetic field is not to change to have electromagnetic induction? But the distance between the charging base and the charging object is always the same, so why is there electromagnetic induction? Originally, the electricity flowing out of the household outlet is alternating current, that is, Say that the direction of the current is constantly changing, and it will follow the flow for a while, and then reverse the flow. Because of this, the magnetic field generated by the charging base coil is continuously changing direction, and does not remain unchanged, meeting the requirements of electromagnetic induction.


Recently, more and more smart phones and tablet computers have begun to provide wireless charging functions. However, unfortunately, when they are charging, as long as they are a little further away from the charging stand, the charging efficiency will be significantly reduced. Even with the latest technology, the charging distance cannot exceed 5cm. In fact, most of the mobile devices that can be wirelessly charged are completely flat on the charging cradle before they can be wirelessly connected to the imagination. Charging is still a bit different.

Using resonance to lengthen charging distance

 

You might ask, doesn't the magnetic field have to be changed to have electromagnetic induction? But the distance between the charging base and the charging object remains the same, so why is there an electromagnetic induction? It turns out that the electricity flowing out of the home socket is alternating current, which means that the direction of the current is changing alternately, and then the flow is followed by a reverse flow. Because of this, the magnetic field generated by the charging seat coil is constantly changing direction, not staying the same, which is in line with the requirements of 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 resonance to elongate the charging distance.

 

To increase the distance between wireless charging and charging efficiency, scientists are trying to use the principle of magnetic resonance to charge wirelessly. Some special components, such as capacitance and inductance, are added to the circuit and the resonant circuit will be formed after proper connection. It's like musical instrument line will be some tuning tool ─ ─ a tuning fork. Tap the tuning fork once, it can continue to vibrate for a period of time, as well as for a short circuit of the resonant circuit, and the circuit will produce a signal for a period of time.

 

The tuning fork has this interesting physical property of resonance. 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. The resonance of the tuning fork can be said to achieve energy transfer. 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 is called magnetic resonance (mri), which is used for wireless charging, which can make the charging distance reach several meters and improve the efficiency. The only difficulty is that it is not easy to adjust the two circuits to exactly the same frequency and maintain a period of time.

 

In addition to Mr Magnetic resonance, scientists have also tried to charge through the light of a laser light, or even to transmit electricity through a radio spectrum similar to the Wifi network in the home. We hope that the breakthrough of these technologies will make our future more convenient when charging!

collection

 

The interaction between electricity and magnetism.

 

The commonly seen wireless charging USES the principle of current magnetic effect and electromagnetic induction. In 1819, Danish scientist urst observed that if there was a current on a piece of wire, it would create a magnetic field around it, allowing the needle to deflect. Later, it is further discovered that the magnetic field will be stronger and more concentrated when the wires are formed into a ring and even wound into a coil, which is called the current magnetic effect.

 

As for electromagnetic induction, it was discovered by Faraday in 1831. Let a magnet or other magnetic source close to a coil that has no current, and the coil produces an inductive current, called electromagnetic induction. It is worth noting that the main point of electromagnetic induction is that the magnetic field should be changed, for example, the magnet is getting closer and closer (and farther and farther away). The external magnetic field, if it stays the same, will not have an inductive current.

 

In a word, the current magnetic effect is that the flow of the current generates a magnetic field around it, and the electromagnetic induction is a constantly changing external magnetic field that causes the coil to generate an inductive current.

 

Charge by electromagnetic induction.

 

These two physical phenomena can be used for wireless charging. The current wireless charging device, which contains a charging base, is actually the coil. When the charging seat is plugged into the home, the magnetic field is generated around the coil due to the current magnetic effect. There is also a coil in the electronic device to be recharged. When it is near the charging base, the magnetic field of the charging 


base will generate an inductive current on the coil of the electronic product through electromagnetic induction. The induction current leads to the battery, which completes the wireless charging between the charging base and the electronic product.

 

You might ask, doesn't the magnetic field have to be changed to have electromagnetic induction? But the distance between the charging base and the charging object remains the same, so why is there an electromagnetic induction? It turns out that the electricity flowing out of the home socket is alternating current, which means that the direction of the current is changing alternately, and then the flow is followed by a reverse flow. Because of this, the magnetic field generated by the charging seat coil is constantly changing direction, not staying the same, which is in line with the requirements of 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 resonance to elongate the charging distance.

 

To increase the distance between wireless charging and charging efficiency, scientists are trying to use the principle of magnetic resonance to charge wirelessly. Some special components, such as capacitance and inductance, are added to the circuit and the resonant circuit will be formed after proper connection. It's like a tuning fork that a musical instrument will have. Tap the tuning fork once, it can continue to vibrate for a period of time, as well as for a short circuit of the resonant circuit, and the circuit will produce a signal for a period of time.

 

The tuning fork has this interesting physical property of resonance. 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. The resonance of the tuning fork can be said to achieve energy transfer. 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 is called magnetic resonance (mri), which is used for wireless charging, which can make the charging distance reach several meters and improve the efficiency. The only difficulty is that it is not easy to adjust the two circuits to exactly the same frequency and maintain a period of time.


In addition to Mr Magnetic resonance, scientists have also tried to charge through the light of a laser light, or even to transmit electricity through a radio spectrum similar to the Wifi network in the home. We hope that the breakthrough of these technologies will make our future more convenient when charging!

 

The practical application of wireless charging in consumer electronics and electric vehicles, represented by apple, samsung and zte, will accelerate the opening of hundreds of billions of markets. 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. Wireless charging prospects are infinite, so let's take a look at the new wireless charging technology.

 

1. Ultrasonic wireless charging: the effective range is nearly 5 meters.

 

UBeam, a company, has developed a new wireless charging model that USES ultrasound to transmit power to a 15-foot space. With such a product, you can move around the house while charging while using a dedicated wireless charging pad. Although uBeam's prototype is clunky, the company is trying to shrink its size and push it to 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 communicates with hardware vendors such as apple and samsung.

 

Venture capitalists also seem to see an opportunity: people familiar with the matter say the company wants to seek a $50 million B round of financing that could be valued at or above $500 million. UBeam declined to comment. The company received $10 million in A round of financing from Upfront Ventures last October, and had previously received $3.2 million in seed investments from companies such as Andreessen Horowitz and Founders Fund. A lot of companies have tried real wireless charging before, but most have failed, and only Mr. This mode must be close to the transmitter, or even directly to the transmitter, so there is no significant breakthrough in the plug-in charge.

 

Early prototype of uBeam.

 

However, the endorsement of many big-name investors suggests that uBeam's wireless charging model 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 says the charging speed of this mode is similar to that of using traditional power sources.

 

There are several advantages to this kind of ultrasonic separation. First, the technique is very safe, using ultrasound similar to that used to monitor a fetus. In addition, the price of the receiver is cheap, about $50, or even less, and compact. Not only that, they can be used to transmit data, so uBeam can also play a role in the Internet of things.

 

Wireless charging rate 

 

 

2. New wireless charging technology: Microsoft intends to use focused 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 if it does, sometimes it's not enough for people to use it on a daily basis, and it's sometimes necessary to charge a full day, so Microsoft research has worked out a potential solution: AutoCharge.


Microsoft researchers describe AutoCharge as a technology that automatically locates smartphones on desks and recharges them. 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; The other is the charging mode, which USES UltraFire CREE XM-L T6 to focus on LED light.

 

focused light to charge


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