Can the coil wire of wireless charger be lengthened if it is short?
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Of course.
The operation steps are as follows
1. 1. According to the needs of the circuit, choose the winding method: first determine the size of the inner diameter. Then the number of layers, height and outer diameter of the coil are determined according to inductance and resistance. The wireless charging coil is suitable for short-wave and medium-wave circuits, with a Q value of 150-250 and high stability. When the wireless charging coil is energized, a magnetic field is formed around it and made into a spiral shape. The more turns, the larger the magnetic field range, the more electricity passes in unit time, and the stronger the magnetic field. According to the skin effect of current, a stronger magnetic field can be obtained by replacing thick lines with more thin lines. In order to improve the utilization of space, the wires used in the coil are usually insulated enameled wires.
When winding with automatic equipment, the arrangement of wires is very important. For a single wire, it is necessary to consider the number of turns and layers of the coil.
2. Precautions during winding:
By selecting cores with different data and coils with different operating frequencies, coils with different frequency characteristics have different characteristics. For example, between several hundred thousand hertz and several megahertz, the coil of the medium wave broadcasting part is usually made of ferrite core and wound with multiple insulated wires. When the frequency is higher than several megahertz, high-frequency ferrite is used as the core of the coil, and air-core coil is also commonly used. In this case, it is not appropriate to use multi-strand insulated wire, but a single thick silver-plated wire should be used for winding. When the frequency is above 100MHz, the ferrite core cannot be used, and the wireless charging and receiving coil can only be hollow. If you want to fine-tune, you can use a steel core.