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Place of origin:Guangdong,China
Application:networks/switching and auto
Wire:100% Copper Wire
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Product Name:Copper lnductor Coil
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Seven tips to easily improve the Q value of the inductor!
First, let's talk about the definition of the inductor quality factor Q.
The Q value is the main parameter for measuring the inductance device. It refers to the ratio of the inductive reactance and its equivalent loss resistance when the inductor operates under the AC voltage of a certain frequency. The higher the Q value of the inductor, the smaller the loss and the higher the efficiency.
The quality factor Q is an important parameter reflecting the quality of the coil. Increasing the Q value of the coil can be said to be one of the key points to be paid attention to when winding the coil.
So, how to improve the Q value of the coiled coil, the following describes the specific method:
1, according to the working frequency, select the wire of the coil
Inductors that operate in the low frequency range are usually wound with insulated wires such as enameled wires. The operating frequency is higher than tens of thousands of Hz, and in the circuit below 2MHz, the coil is wound with a plurality of insulated wires, so that the surface area of the conductor can be effectively increased, thereby overcoming the effect of the skin effect and making the Q ratio the same. A single wire wound with a cross-sectional area is 30%-50% higher.
In circuits with a frequency higher than 2MHz, the inductor coil should be wound with a single thick wire, and the diameter of the wire is generally 0.3mm-1.5mm. An inter-winding inductive coil is used, which is usually wound with a silver-plated copper wire to increase the conductivity of the wire surface. At this time, it is not suitable to use multi-strand wire winding, because the multi-strand insulated wire will cause extra loss when the frequency is high, and the effect is not as good as that of a single wire.
2, select high-quality coil bobbin to reduce dielectric loss
In high frequency applications, such as short-wavelength bands, the dielectric loss is significantly increased due to the common coil bobbin. Therefore, high-frequency dielectric materials such as high-frequency ceramics, polytetrafluoroethylene, polystyrene, etc. should be used as the skeleton. It is wound by a winding process.
3, choose a reasonable coil size
Selecting a reasonable coil size can reduce the single-layer coil (φ20mm-30mm) with a certain loss outer diameter. When the ratio of the winding length L to the outer diameter D is L/D=0.7, the loss is minimal; the multilayer coil with a certain outer diameter L/ D = 0.2-0.5, with t/D = 0.25-0.1, the loss is minimal. When the winding thickness t, the winding length L, and the outer diameter D satisfy 3t + 2L = D, the loss is also the smallest. The coil with the shield is optimal when L/D = 0.8-1.2.
4. Select the diameter of a reasonable shield
The use of a shield will increase the loss of the coil and reduce the Q value, so the size of the shield should not be too small. However, the size of the shield is too large, which increases the volume, so the diameter of the proper shield is selected. When the ratio of the shield diameter Ds to the coil diameter D satisfies the following value, that is, Ds/D = 1.6 - 2.5, the Q value is reduced by not more than 10%.