The wireless charger refers to a charger that is connected to a terminal device that needs to be charged without a conventional charging power cord. The latest wireless charging technology is adopted, and by using the magnetic field generated between the coils, the magical transmission of electric energy, the inductive coupling technology will Become a bridge connecting charging base stations and devices.
1. In theory, wireless charging technology is harmless to human body safety. The resonant principle used in wireless charging is magnetic field resonance, which is transmitted only between coils that resonate at the same frequency, while other devices cannot accept the band. In addition, wireless charging technology The magnetic field used is itself harmless to the human body. However, wireless charging technology is a new type of charging technology. With the wireless charger of Maiyuan Technology, many people will worry that the wireless charging technology will appear just like the Wi-Fi and mobile antenna masts. In fact, the technology itself is harmless. .
2. The wireless charging technology uses magnetic resonance to transmit electrical energy between the electric field and the magnetic field between the charger and the device, and the coil and the capacitor form a resonance between the charger and the device.
3. This system can be widely used in the future, such as charging areas for electric vehicles and power transmission for computer chips. The charging system developed with this technology requires only one-fifth of the current charging time.
4. Conversion rate has always been a concern for many people. Research by the Massachusetts Institute of Technology shows that the loss of wireless charging technology is lower than that of wired charging technology. The wireless charging conversion rate is a few percentage points higher than the cable. High conversion is also a key factor in the global application of wireless chargers. However, wireless charging technology is also limited by distance. In the future, it is necessary to solve the problem of precise positioning of the long-distance transmission for the band and magnetic field range.
5, the core chip is one of the difficulties in the application of wireless charging technology. Precision radiation range control, magnetic field frequency, and other controls are all implemented by the chip.
The wireless charging system mainly adopts the principle of electromagnetic induction, and energy transfer through the coil realizes energy transfer. As shown in the figure, when the system is working, the input terminal converts the AC mains into a DC power through the full-bridge rectifier circuit, or directly supplies the system with a 24V DC terminal.
The DC power output after the power management module is converted into high frequency alternating current by the 2M active crystal oscillator to supply the primary winding. The energy is coupled through two inductor coils, and the current output from the secondary coil is converted into direct current by the conversion circuit to charge the battery.
A changing magnetic field produces a changing electric field. A changing electric field produces a changing magnetic field whose magnitude is related to their rate of change. The rate of change of the sinusoidal function is another sinusoidal function, so the electromagnetic wave can propagate out and the induced voltage The generation is related to the change of the magnetic flux, so the magnetic field that changes inside the coil generates an induced voltage, thereby completing the charging process.
Mobile phone wireless charging is a relatively new charging method, the principle is actually very simple, that is, the ordinary transformer main secondary is separated to achieve the purpose of wireless. Of course, the wireless charging frequency is relatively high, and even the core can be discarded directly between the coils to achieve energy transfer.
Take the Samsung S6 as an example: just connect the USB cable and plug it into the socket. When the phone is out of power or is about to be out of power, put the phone on the charger board and the charger and phone will instantly connect and charge. When charging, the LED light around the wireless charger will illuminate to show the status of use. In addition, the battery icon at the top of the phone screen will also show the charging status. When the phone battery is fully charged, the LED indicator changes from a faint blue light to a vibrant green color.
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