Working Principle of Wireless Charging
Physicists have long known that energy can be effectively transmitted between two objects with the same resonance frequency, and that the interaction between objects of different frequencies is more than
Principle Chart of Wireless Charger
Weak. The singer's singing can break one of the bottles of different water without affecting the other bottles. It's as if we were on a swing, just sitting on it and letting the drooping legs move in sync to give the swing power. Wireless charging technology uses this principle. Similarly, wireless charging technology also applies the principle of electromagnetic wave induction, and related AC induction technology, a technology that uses the corresponding coil to send and receive the inductive AC signal to charge at the sending and receiving ends. Users simply need to place the charging device on a "tablet" to charge. Such charging methods have appeared on watches and razors in the past, but they could not effectively charge large-capacity lithium-ion batteries at the time. Wireless charger technology principle composition as shown in the figure
Originally invented by a British company, a new type of wireless charger looks like a plastic mouse pad. This "mouse pad" contains a dense array of small coils, so it can generate magnetic fields and transmit energy to electronic devices equipped with dedicated receiving coils. And charge it. The receiving coil is magnetic
Principle Chart of Wireless Charger
The alloy is made of wires and is similar in size and shape to gum, so it can be easily attached to electronic equipment. Placing the phone on the pad can charge the phone and can charge multiple devices at the same time. Charging technology has been around, but the new invention is more convenient and practical. Equipment such as mobile phones can be charged at any point on the "mouse pad" as long as they are affixed with a receiving coil, unlike some previous technologies that require precise positioning. Several devices are placed on the mat at the same time and can be charged at the same time. The magnetic field generated by the charger is very weak and can charge the device without affecting nearby credit cards, videotapes, and other items that use magnetism to record data.
The wireless charging system mainly adopts the principle of electromagnetic induction to realize the energy transfer through the energy coupling of the coil. As shown in the figure, when the system is working, the input end converts the AC power through the bridge rectifier circuit into DC power, or uses the 24V DC power end to directly supply the system.
After the power management module, the output DC is converted into a high frequency AC supply primary winding through 2M active crystal vibration inversion. By coupling energy between two inductive coils, the power output from the secondary coil changes from the receiving circuit to direct current to charge the battery.
The changing magnetic field will produce a changing electric field, and the changing electric field will produce a changing magnetic field. Its size is related to their rate of change, and the rate of change of the sine function is another sine function, so electromagnetic waves can spread out. The generation of induction voltage is related to the change of magnetic flux, so the magnetic field that changes within the coil produces induction voltage, thus completing the charging process.
Wireless charging of mobile phones is a relatively new way of charging. The principle is actually very simple. It is to separate the main and secondary levels of ordinary Transformers to achieve wireless purposes. Of course, the wireless charging frequency is relatively high, and even the direct coil can be discarded to achieve the effect of energy transfer.