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 direct current is converted into high-frequency alternating current through the 2M active crystal oscillator inverter to supply the primary winding.
Wireless charging system mainly adopts the principle of electromagnetic induction. Wireless charger refers to the need to connect to the need to charge without the traditional charging power cordThe charger on the terminal device adopts 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 the bridge connecting the charging base station and the device.
Wireless charging, also known as inductive charging or non-contact inductive charging, based on the principle of electromagnetic induction, it is not necessary to transmit electricity to the device like the traditional wired charger, but the device that needs to be charged can be charged by contacting the wireless charging base.
The principle of wireless charging technology is "magnetic electricity", which is simply installed on the charging device and mobile phone equipmentThe two "magnetic devices" sense each other and form an electric current. At present, products supporting wireless charging have appeared in mobile phones, electric vehicles, smart furniture and other fields. Among them, in the mobile phone industry, the "Qi standard" is the most common, and Qi labels are often used in the packaging of many mobile phones and wireless chargers.
Wireless charging uses the principle of electromagnetic induction, which operates at a very low frequency and does little harm. If you are still worried, you can choose a shielded scheme.
② Silent mode during wireless charging only OPPO wireless charger is supported. ③ Wireless charging is temporarily unavailable when the mobile phone is powered externally.
Mobile phones that support wireless charging are Honor X40 GT, iQOO Z Redmi Note 11T Pro, Redmi Note OPPO KOPPO K9x and so on. Honor X40 GT Honor X40 GT design high appearance level, equipped with racing black color, very suitable for game users. It is equipped with a Snapdragon 888 processor and 4001 square mm liquid-cooled VC, running splitI earned $810,000.
oppo k9x is a thousand yuan entry-level model, with strong battery life configuration, 49 inch large screen also supports 90Hz refresh rate, smooth picture oppo k10x reference price: 1199 yuan -- 8G 128G.
Others: NFC, Bluetooth 3, X-axis motor, stereo dual amplifier, 5mm headphone jack, hidden camera detection function, HyperBoost full link game frame stabilization. Summary: This is a cost-effective model, the performance of Tianguet 8000 series with LCD eye screen, very market. As aFor the model within 2000 yuan, the process and appearance level is also good. Suitable for friends who love to play games and have a small budget. The downside is that the fuselage is a little heavy.
Fixed frequency is better. The working principle of the frequency conversion architecture is to adjust the transmission power by changing the operating frequency, which will cause certain interference to the mobile phone circuit in some transmission bands, and the fixed frequency does not appear this problem.
In the Qi standard, there is a fixed frequency voltage regulation mode of work. That is, fixed operating frequency, for dynamicLoad power requirements, through the regulator unit, to achieve dynamic power output. However, the existing voltage regulator on the market first fixed the operating frequency of the voltage regulator itself, and then adjusted the input duty ratio to achieve the adjustment of the output voltage. The inherent disadvantages of this method are: 1) When the input voltage changes, it will directly affect the output stage.
iWALK Magic Scorpion charger is really ideal for wireless charging, taking Apple mobile phones as an example, support 5W fixed frequency fast charging. In the actual test, the fast charge head of 5V/2A is used, and the average is about 6W. It takes 2 hours to charge to 100%