According to the characteristics of working frequency, suitable wire for coil is selected
Inductor coils at low frequencies are generally wound with insulated conductors such as enameled wire. In a circuit whose operating frequency is higher than tens of kilohertz but lower than 2MHz, multiple insulated wires are used to wind the coil. In this way, the surface area of the conductor can be effectively increased, so as to overcome the effect of skin effect and make the Q value 30% to 50% higher than the coil wound by a single wire with the same sectional area.
In a circuit with a frequency higher than 2MHz, the toroid inductor inductance coil shall be wound by a single thick wire, whose diameter is generally 0.3mm-1.5mm. Interwound inductance coils, usually coiled with silver-plated copper wire, are used to increase the conductivity of the wire surface.
At this time, it is not appropriate to choose multi-wire winding, because multi-wire insulation at high frequency, the coil insulation medium will cause additional loss, the effect is not as good as a single wire.