Power generation across the air and electromagnetic induction

Working principle

   Physicists have long known，Energy can be effectively transmitted between two objects with the same resonant frequency，The interaction between objects of different frequencies is relatively weak。

   A singer's performance can shatter a bottle containing different amounts of water，This is the reason why it does not affect other bottles。This is also like when we are swinging on a swing，Just sitting on it and letting your drooping legs swing in unison can give the swing power。Wireless power generation technology precisely utilizes this principle。The same，Wireless power generation technology also applies the principle of electromagnetic wave induction，And related AC sensing technologies，A technology that uses corresponding coils at the sending and receiving ends to send and receive alternating current signals that generate induction for charging， Users only need to place the charging device in one“"Tablet"”It can be charged immediately upon use。

   Schematic diagram of wireless charger

   The wireless charging system mainly adopts the principle of electromagnetic induction，Energy transfer is achieved through energy coupling with coils。When the system is working, the input terminal will be powered by direct current。"Through2The coupling energy of an inductance coil，The current output by the secondary coil is converted into direct current through the receiving conversion circuit LEDPower supply for lamps。

   A changing magnetic field will generate a changing electric field，A changing electric field generates a changing magnetic field，Their magnitudes are all related to their rates of change，The rate of change of the sine function is another sine function，So electromagnetic waves can travel out，The generation of induced voltage is related to the variation of magnetic flux，So the changing magnetic field inside the coil generates an induced voltage，Thus, the power extraction process is completed。

Main features

   1、Theoretically speaking，Wireless charging technology is safe and harmless to the human body，The resonance principle used in wireless charging is magnetic field resonance，It is transmitted only between coils that resonate at the same frequency，However, other devices cannot accept the band，In addition，The magnetic field used in wireless charging technology is itself harmless to the human body。But wireless charging technology is, after all, a new type of charging technology，Take wireless chargers for example，Many people are worried that wireless charging technology will be like it was in the pastWi-FiJust like when mobile phone antenna poles first appeared，In fact, technology itself is harmless。

2、Wireless charging technology uses magnetic resonance to transfer electrical energy in the electric and magnetic fields between the charger and the device，The coil and capacitor form resonance between the charger and the device。