1, the working principle of the wireless charger: the principle of electromagnetic induction, energy coupling through the coil to achieve energy transfer. 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. Power through the power management moduleThe direct current is converted into high frequency alternating current by 2M active crystal oscillator to supply the primary winding.
2, wireless charging methods are electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, wireless charging of mobile phones mostly uses the principle of electromagnetic induction. Electromagnetic induction wireless charging, when the current of the power supply through the coil (wireless charger's power supply coil) will generate a magnetic field, other unenergized coil (mobile phone side of the electric coil) close to the magnetic field will generate current, charging the mobile phone.
3, electromagnetic induction. The charging dock and the phone terminal have built-in coils, respectively, whenWhen the two are close, the generator coil generates a certain current in the mobile phone receiving coil based on a certain frequency of alternating current through electromagnetic induction, so as to transfer the point energy from the source to the receiving end, and then start to supply power from the charging seat to the mobile phone. Magnetic resonance.
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 coil generates a certain current in the mobile phone receiving coil through electromagnetic induction based on a certain frequency of alternating current, so as to point energyFrom the originating end to the receiving end, it begins to power the phone from the charging seat. Magnetic resonance.
Electromagnetic induction wireless charging: This way of charging is to use the inductive magnetic flux generated between a wireless charging board and the induction magnet on the mobile phone, and convert this magnetic force into an electric power for current transmission.
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, and uses the latest wireless charging technology to transmit electric energy magically by using the magnetic field generated between the coilsInductive coupling technology will become a bridge connecting charging base stations and equipment.
The principle of mobile phone wireless charging is to use electromagnetic induction technology to transfer electric energy through the magnetic field in the air to the inside of the mobile phone, so as to realize the charging of the mobile phone. Specifically, wireless charging devices mainly include two parts: transmitter and receiver. The transmitter generates a high-frequency alternating magnetic field through a built-in coil, and the coil inside the receiver receives the magnetic field energy and converts it into electricity, thus charging the phone.
Wireless charging coil test requirements, such as 100 kHz/1V, where 1V refers to the excitation voltage, the test frequency and the supply voltage work together on the system, and the inductance, Q value and AC resistance are analyzed by the LCR tester. Coil design and production, silk-covered wire coil and multi-stranded wire coil are respectively used for the transmitting end, requiring low cost, simple process, suitable for conventional product applications.
The steps are as follows: First cut the end of the USB data cable connected to the mobile phone with scissors or a knife, and then cut the long end of the data cable into the incision, you will seeGreen, red, white, and black wires. Cut the green and black wires off. Cut the red and green wires off to expose the copper wires.
The principle is to use the magnetic field generated between the coils to generate a current for transmission.
These two physical phenomena can be used at the same time, wireless charging can be carried out. Current wireless charging devices all contain a "charging seat", which is actually a coil. When the charging seat is connected to the home plug, a magnetic field is generated around the coil due to the magnetic effect of the current. To charge electronic products, there is also a coil inside, when it reliesWhen close to the charging base, the magnetic field of the charging base will generate an induced current on the coil of the electronic product through electromagnetic induction.
is the use of the principle of electromagnetic induction, if you can do electronic then you can do a vibration circuit, the vibration signal added to a coil, another coil string a LED, the two coils close to the light on. If you want to produce your own, you can go to Xincotec, there are very cheap modules. You can also buy IC processing. It's cheap to make.
Wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmissionp> The inductor L1 and capacitor C1 have a resonant frequency of 1MHz, and because the circuit is resonant, the no-load current is small when the receiving coil is not near the transmitting coil. The receiving end also adopts the mode of resonance, which can maximize the transmission efficiency of energy, and the direct current is obtained by the filtered capacitor after the Schottky diode is rectified, and the charging current is above 0.6A. If the coil is made into a barrel shape, the transmission efficiency will be higher.
Because the circuit is in a resonant state, the no-load current is very small even if the receiving coil is not near the transmitting coil. At the receiving end, harmonic is also usedVibration principle to improve the efficiency of energy transmission. Schottky diode is used to rectify the signal, after filtering capacitor processing, to obtain direct current, and then charge the battery. In the best working condition, the charging current can reach more than 0.6A.
The same size. The same size and as close as possible, otherwise it will have no effect, low conversion efficiency.
Magnetic resonance is used to transfer charge in the air between the charger and the device, then the coil and capacitor form a resonance between the charger and the device to achieve efficient transmission. Electromagnetic induction wireless charging technology for this set of system wireless charging technology, the defects are relatively largeTo be obvious, the magnetic field will decay rapidly with the increase of distance, and the energy is more than divergent around, so the induced current is far less than the input current, so the energy utilization rate is not high.
The secondary winding is broken, the wireless charging coil has two windings, one is the main winding, one is the secondary winding, after the secondary winding is damaged, it will cause the main winding to heat, and the output has no voltage.
1.85 euros. According to the query X technology, the internal resistance of the wireless charging coil is 0.85 eurosWireless charging technology comes from radio energy transmission technology, which can be divided into two ways of low-power wireless charging and high-power wireless charging, and low-power wireless charging often uses electromagnetic induction.
2, and then according to the inductance value and resistance and other factors to determine the number of layers of the coil, 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.
3, wide impedance range, to meet a variety of needs of the inductance of the wireless charging coil is usually at the micro hen level, the test frequency is in the kHz range, which requires a wide and accurate measurement range. The E4980A/AL has a wide impedance range from 4 milliohm to 100 milliohm, and can cover this band with 10% accuracy, making it particularly suitable for the precise evaluation of wireless charging coils.
4, 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, increase the coil is equal to increase the resistance, it will make the current slow, the coil is proportionally wound, too much or too little can not, coil wound less, there will be damage to the parts, resulting in parts burned spark, For some do not arbitrarily modify the wireless charging base.
5In the range of ravg 0~0.08 m, the output power increases first and then decreases with the increase of coil turns; In the range of ravg 0.08~ 0.4m, the output power decreases first and then increases and then decreases with the increase of coil turns. For a fixed operating frequency, the quality factor Q mainly depends on the shape and size of the coil and the material used.
6, mobile phone wireless charger is probably the diameter of the mobile phone end coil about 50mm, the diameter of the charger end is about 46 to 48mm, because of different mobile phone models may be different, but the best transmission method isThe coil size of the mobile phone end and the charging end is the same.