Wireless charger schematic diagram The wireless charging system mainly uses the principle of electromagnetic induction to achieve energy fer through energy coupling through coils. When the system is working, the input terminal be powered by direct current. Coupling energy through two inductors, the current output by the secondary coil is converted into direct current by the receiving conversion circuit to power the LED lamp. A changing magnetic field produce a changing electric field, and a changing electric field produce a changing magnetic field, the size of which is related to their rate of change. The rate of change of a sine function is another sine function, so electromagnetic waves can spread out, and the induced voltage The generation of is related to the change of magnetic flux, so the changing magnetic field inside the coil generates an induced voltage, thereby completing the power extraction process.<br><br>Color: As shown Material: plastic+metal<br><br>Package Contents: 1 x Experimental equipment set(no 2 x AA batteries)<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.