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The history of mobile wireless charging and its two charging schemes
2019-11-26 10:19:52

We all know that wireless charging of mobile phones is very popular now. What is its development history? What changes have mobile wireless charging experienced? And what are the current wireless charging schemes for mobile phones? What are their advantages and disadvantages?

First of all, let's take a look at the history of mobile wireless charging technology and see how it has developed to the present.

Mobile wireless charging technology is not a "black technology". As early as the 1930s, scientists named Michael Farah discovered the principle of electromagnetic induction, that is, changes in the surrounding magnetic field will generate current in the wire. Today, wireless power transmission, which is suitable for smart phones and relatively mature, has gradually derived two wireless charging schemes:

The first is the electromagnetic induction wireless charging scheme.

This is the wireless charging technology scheme with the highest frequency and the widest popularity in the industry. Its principle is Faraday battery induction law, that is, to generate a certain current in the secondary coil through electromagnetic induction for a certain frequency of alternating current in the primary coil, so as to transfer the energy from the transmission end to the receiving end.

When it is applied to the mobile phone, it is embedded in the back cover of the mobile phone and the wireless charging base with the special coils (including conversion and recognition, power management and other chips) for the receiving end and the transmitting end respectively. When the electric energy is input into the coil at the transmitting end, a magnetic field will be generated, and the coil at the receiving end will generate a current when the magnetic field senses the coil at the receiving end to realize the charging process.

Theoretically, the larger the number and area of the coils in the transmission end and the receiving end, the more power per unit time is transmitted wirelessly, and the looser the requirements for the distance and position between them are.

Wireless charging company

Advantages: low cost, mature technology, relatively high conversion efficiency.

Disadvantages: the charging distance is too short, and it needs to be aligned with the contact to ensure the effect.

The second is the magnetic resonance wireless charging scheme.

The scheme is composed of energy transmitting device and energy receiving device. When the transmitter and the receiver reach the same frequency, magnetic resonance can be generated to meet the energy exchange. Its principle is similar to resonance.

Compared with the electromagnetic induction scheme, the magnetic resonance scheme has a longer effective transmission distance (supporting several centimeters to several meters), and can realize one to many charging.

Magnetic resonance type belongs to the "advanced version" of electromagnetic induction type. In theory, only adding a capacitor in the secondary coil (mobile phone) to form a resonance circuit can form resonance with the fixed frequency AC on the charging base, so as to realize wireless charging with multiple devices and long distance.

Advantages: long charging distance, one to many support.

Disadvantages: charging multiple devices at the same time will improve heat generation and conversion efficiency, and increase efficiency will produce greater electromagnetic radiation, which is not good for safety.

From the above point of view, the two schemes have their own advantages and disadvantages. This also proves that our wireless charging technology has a lot of room for development. I believe that in the future, our wireless charging technology will develop further and bring greater benefits to our life. In the end, we can not only charge fast, but also charge safely in a long distance, even play with mobile phones while charging.


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