The working principle of the wireless charger

- Jan 12, 2018 -

The working principle of the wireless charger


Physicists have long known that energy can be transmitted effectively between two objects with the same resonance frequency, and the interaction between objects at different frequencies is weak.


A singer can sing one of the different water bottles, without affecting the other bottles. It's like we just sit on the swing and let the drooping legs swing in the same way when we swing on the swing. The wireless charging technology is taking advantage of this principle. 

Similarly, wireless charging technology is also applied the principle of electromagnetic induction, and the induction technology, the sending and receiving end use to send and receive the corresponding coil induced AC signal for charging of a technology, users only need to charge the equipment in a "flat" can be charged this way of charging, used to appear in watches and razors, but not for large capacity lithium ion battery charging effectively.


Wireless chargingAt first by a British company invented a new type of wireless charger, it looks like a plastic mouse pad, the mouse pad coil array "is arranged in dense, so it can produce the magnetic field, the energy is transmitted to the electronic device is equipped with a special receiver coil, charging from the. The receiving coil is magnetic


The alloy is made of wire, the size and shape of which are similar to the gum, so it can be easily attached to the electronic equipment. Put the cell phone on the pad and charge it at the same time. Charging technology has already appeared, but this new invention is more convenient and practical. Devices such as mobile phones can be recharged at any location on the mouse pad as long as they attach the receiving coil. Unlike previous technologies, they need precise positioning. Several devices are placed on the cushion at the same time and can be recharged at the same time. The charger produces a very weak magnetic field that can charge the device but does not affect the nearby credit cards, video tapes, and other objects using magnetic recording data.


The wireless charging system mainly adopts the principle of electromagnetic induction, and the energy transfer through the coil is realized by the coupling of energy. As shown in the picture, the input end of the system will transform the AC city electricity through the full bridge rectifier circuit into DC, or direct the power supply to the system with the 24V DC end.


The DC power output through the power management module is converted to the primary winding through the 2M active crystal inverter to the high frequency alternating current. By coupling the energy through 2 inductors, the output current of the secondary coil is changed into direct current to charge the battery by the accepted conversion circuit.


The electric field magnetic field changes, changes of the electric field will produce changes in the magnetic field, the size and the change rate of the relationship, and the change rate of the sine function is a sine function, so the electromagnetic wave can be spread out, and the change and flux of induction voltage is related to the internal changes so the magnetic field induced voltage, thus completing the charging process.


Mobile phone is a relatively new charging mode, its principle is very simple, which is to separate the primary and secondary levels of the common transformer to achieve the purpose of wireless. Of course, the frequency of the wireless charging is high, and even the direct coils of the iron core can be used to achieve the function of energy transfer.


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