Only a part of the air core toroid, such as chokes, low-frequency chokes, oscillation coils, and LG fixed inductance coils, is produced according to the specified standards, and the vast majority of inductance coils are non-standard parts that are often customized according to the actual needs of customers. Because the inductance coil is widely used, such as computers, medical devices, printers, televisions, audio, communication transmission, hearing aids, electronic tags, motors, ignition systems, etc.
How to increase the Q value of the wound coil
The figure of merit Q is an important parameter that reflects the quality of the coil, and increasing the Q value of the coil can be said to be one of the key points to pay attention to when winding the coil. So, how do I increase the Q value of the wound coil?
(1) According to the working frequency, select the wire of the coil
Inductive coils that operate in the low-frequency band are generally wound with insulated wires, such as enamelled wires. In circuits with operating frequencies higher than tens of thousands of hertz and lower than 2 MHz, multi-strand insulated wires are used to wind the coil so that the surface area of the conductor can be effectively increased, so that the influence of the skin effect can be overcome, and the Q value is 30%–50% higher than that of the coil wound by a single wire with the same cross-sectional area. In circuits with frequencies higher than 2 MHz, the inductance coil should be wound with a single-thick wire, and the diameter of the wire is mostly 0.3–1.5 mm. An interwound inductance coil is used, which is often wound with silver-plated copper wire to increase the conductivity of the wire surface. At this time, it is not advisable to use multi-strand wire winding, because when the frequency of multi-strand insulated wire is very high, the coil insulating medium will cause additional loss, and its effect is not as good as that of a single wire.
(2) Select high-quality coil skeleton to reduce dielectric loss
On occasions of higher frequencies, such as short-wave bands, because of the ordinary coil skeleton, its dielectric loss increases significantly; therefore, high-frequency dielectric materials, such as high-frequency porcelain, PTFE, polystyrene, etc., should be selected as the skeleton, and the inter-winding method should be used.
(3) Choosing a reasonable coil size can reduce the loss of a single-layer coil with a certain outer diameter (φ20mm-30 mm), and the loss is the smallest when the ratio of the winding length L to the outer diameter D L/D=0.7, and the loss is the smallest when the multilayer coil with a certain outer diameter L/D=0.2-0.5 is used with t/D=0.25-0.1. When the winding thickness t, winding length L, and outer diameter D meet the requirements of 3t + 2L = D, the loss is also minimal. The coil with shielding cover is best when its L/D = 0.8–1.2.
(4) Select a reasonable diameter of the shield
With a shield, it will increase the loss of the coil and reduce the Q value, so the size of the shield should not be too small. However, if the size of the shield is too large, it will increase the volume, so it is necessary to select a reasonable-diameter shield.
When the ratio of the diameter of the shield Ds to the diameter of the coil D meets the following values, that is, Ds/D = 1.6–2.5, the Q value is reduced by no more than 10%.
(5) The number of coils can be significantly reduced by using magnetic cores
The use of a magnetic core in the coil reduces the number of coils, which not only reduces the resistance value of the coil but also reduces the volume of the coil.
(6) The coil diameter is appropriately larger, which is conducive to reducing the loss Under possible conditions, the coil diameter is selected to be larger and the volume is increased, which is conducive to reducing the loss of the coil. For general receivers, the diameter of the single-layer coil is 12 mm–30 mm and the multi-layer coil is 6 mm–13 mm, but from the perspective of volume, it should not exceed the range of 20 mm–25 mm.
(7) Reduce the distributed capacitance of the wound coil
Try to use the skeletonless method to wind the coil or the coil wound on the ribbed skeleton, which can reduce the distributed capacitance by 15%–20%, and the segmented winding method can reduce the distributed capacitance of the multilayer coil by 1/3~l/2. For multilayer coils, the smaller the diameter D, the smaller the winding length L, or the greater the winding thickness t, the smaller the distributed capacitance. It should be noted that the distributed capacitance of the coil after diffusion and encapsulation will increase by 20%–30%.
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Q: What is the role of inductance coils in electronic devices?
A: Inductance coils are used in a variety of electronic devices. They are often used to size the current in a particular circuit to the desired level to meet the needs of a particular device. Inductance coils can also act as EMI (electromagnetic interference) suppressors, helping to eliminate electronic noise and other signal interference. In addition, inductance coils are also essential components in communication equipment and radio fields, and are frequently used to adjust frequencies and screen signals.
Q: What are the advantages of using air core toroid?
A: First, an inductor coil can limit the current to a specific level to protect the circuit. Second, inductive coils can create an electromagnetic field in the circuit, which is important for electromagnetic interference suppression and the development of unidirectional conductive materials. Third, the inductance coil has the ability to adjust and filter the signal, which is conducive to improving the performance of communication equipment. Finally, inductance coils also have the advantages of being small, lightweight, small, and low in price, and are widely used in electronic devices in various industries.
Q: What are the issues that need to be paid attention to when using inductance coils?
A: Firstly, it is necessary to ensure the quality of the inductor coil and the suitable application for use, because it is necessary to pay attention to its rated power, resistance, and inductance value in the process of using the inductance coil. Secondly, it is essential to maintain a good connection when using inductance coils, as their performance and effectiveness depend on the connection between the wires. Finally, pay attention to the load that the inductor coil is subjected to in daily use to avoid overloading and damaging the coil.
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