The basic principle of wireless charging is to convert the current into a magnetic field, which is transmitted through the air and then converted into a current to be transmitted to the intelligent terminal. When the system works, the input end converts the AC mains into direct current through the full bridge rectifier circuit, or uses the 24V direct current end to supply power to the system directly. After passing through the power management module, the output DC is converted into high-frequency AC by 2M active crystal inverterCurrent is supplied to the primary winding.
The principle of wireless charging: electromagnetic induction. The charging base and the mobile phone terminal have built-in coils respectively. When the two are close, the generating coil generates a certain current in the mobile phone receiving coil based on a certain frequency of alternating current through electromagnetic induction, thereby transferring the point energy from the originating end to the receiving end, and then starting to supply power to the mobile phone from the charging seat. Magnetic resonance.
Because the energy is transmitted between the charger and the electrical device by inductive coupling, the two are not connected by wires, so the charger and the electrical device can be exposed without conducting contacts. Wireless charging mainly uses electromagnetic induction,Magnetic resonance, radio wave technology principle.
Wireless charging system mainly adopts the principle of electromagnetic induction. Wireless charger refers to the charger that does not need to be connected to the terminal device that needs to be charged without the traditional charging power cord, using the latest wireless charging technology, through the use of the magnetic field generated between the coils, the magic transmission of electrical energy, inductive coupling technology will become a bridge connecting the charging base station and equipment.
Using the principle of electromagnetic induction charging equipment, its principle is similar to the transformer, through the transmitter and receiver end set coil, transmitter coil under the action of electricity to send electromagnetic signals.The receiving coil receives the electromagnetic signal and converts the electromagnetic signal into current, so as to achieve the purpose of wireless charging.
Wireless charging principle is mainly electromagnetic induction and wireless electromagnetic wave technology. The principle of electromagnetic induction is the basis of wireless charging. Electromagnetic induction occurs when a magnetic field is generated between a charger and a mobile device. The alternating current generated at the charger end will create eddy currents in the magnetic field, and the receiving coil at the mobile device end will sense this eddy currents. In this way, power is transferred from the charger to the mobile device.
Notes for winding coils mainly include the selection of coils with different frequency characteristics, the selection of magnetic cores of different materials, and the consideration of parameters such as inductance and distributed capacitance of the coil. In the wireless charging receiving coil, according to its working characteristics in the audio segment, silicon steel sheet or permalloy is usually selected as the core material.
Finally, after confirming, put the phone on the wireless charger, the charging prompt will be displayed, and it is OK. Wireless charging note: Do not charge the phone with wirelessIf metal objects, magnetic stickers, magnetic cards and other foreign objects are placed between electrical appliances (such as the car magnetic bracket iron attached to the back of the mobile phone), the mobile phone may not be charged properly or be damaged by overheating. Place the mobile phone correctly. If the wireless charging coil deviates too much, the charging efficiency may be low or it cannot be charged.
Ultra-thin multi-strand and winding coil for the receiving end, the use of multiple copper wire side by side winding, effectively reduce the skin effect, to achieve ultra-thin design, improve efficiency. As a key component, magnetic plates, including nanocrystalline magnetic plates and ferrite magnetic plates, are made by rapid solidification, heat treatment, lamination, split and die cutting steps, respectively, to meet the differencesApplication requirements.
First of all, according to the needs of the circuit, select the winding method: First of all, determine the size of the inner diameter. Then according to the inductance value and resistance and other factors to determine the coil layer number, height, outside diameter and so on. Wireless charging coil is suitable for short wave, medium wave circuit, its Q value can reach 150-250, and has high stability.
Wireless charging base to increase the coil, or do not modify it, you increase the coil not only did not play a good effect but affect the speed of charging, increasing the coil is equal to increasing the resistance, it will make the current slow, the coil is proportionally wound, too much too little can not beCoil winding is less, there will be damage to the parts, resulting in parts burning caused sparks, because do not be free to modify the wireless charging base.
Simply put, the current is concentrated in the skin part of the conductor, so it is called the skin effect. The main reason for this effect is that the changing electromagnetic field creates a vortex electric field inside the conductor, which is in phase with the original currentOffset. Obviously, in high-frequency applications, if only one wire is used because of its relatively small surface area, the current utilization rate will be greatly reduced, so that the wire heating is serious or the signal attenuation is increased, which is obviously what we do not want.
The same size. The same size and as close as possible, otherwise it will have no effect, low conversion efficiency.
This is similar to the principle of a single-phase transformer, that is, the AC coil produces the opposite magnetic field back and forth, and when the receiving coil senses the magnetic field change, the induced current is generated, and the received electrical signal can be charged by transformer rectification. It's kind of like, you know, using a sense