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Inductors mainly play the role of filtering, oscillation, delay, notch, etc. in the circuit, as well as screening signals, filtering noise, stabilizing current and suppressing electromagnetic wave interference. According to the product characteristics of inductors, it generally includes the following common sense and terms, which you must understand. DC resistance, DC resistance is the resistance value measured under DC. The higher the resistance, the greater the power loss. The smaller the DC resistance of various inductors for resonance, impedance matching and choke, the better. Self resonant frequency refers to the frequency when the coil itself resonates with its own capacitance. If the resonant frequency is exceeded, the inductor will not work. The self resonant frequency of various inductors for resonance, impedance matching and choke shall be greater than the working frequency. DC superposition characteristic refers to the inductance characteristic of superimposing DC current on micro AC current. Allowable current / rated current. Allowable current refers to the maximum DC current that can pass through the coil without damaging the element. If the current exceeds the allowable current, too much heat will be generated and the quality cannot be guaranteed. The allowable current of the choke inductor must be greater than the maximum current when the circuit is working. Working temperature range refers to the allowable range of ambient temperature when the inductor is working. The operating temperature range does not include naturally generated heat. The working temperature range of various inductors for resonance, impedance matching and choke must be within the working temperature range of the equipment. Magnetic saturation, if a magnetic field is applied to magnetic substances such as ferrite, magnetic flux will be generated. The inductance of the inductor depends on the degree of the magnetic flux. The stronger the magnetic field, the smaller the increase of magnetic flux corresponding to the magnetic field. Even if the magnetic field is enhanced, the magnetic flux will not increase. This is the phenomenon of magnetic saturation of magnetic substances. From the point of view of the inductor, as the current through the inductor increases, the magnetic field will also increase, so there will be magnetic saturation of magnetic substances, and as a result, the inductance value will decrease. Since the magnetic saturation characteristics of inductors depend on the type and structure of magnetic materials used by inductors, and inductors used in power supply systems pass a large current, it becomes very important whether magnetic saturation is easy to occur. In order to confirm its degree, refer to the DC superposition characteristics of inductors.
  2022-10-1214:21:50
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Inductors mainly play the role of filtering, oscillation, delay, notch, etc. in the circuit, as well as screening signals, filtering noise, stabilizing current and suppressing electromagnetic wave interference. The structure of inductor is similar to that of transformer, but there is only one winding, which is generally composed of skeleton, winding, shielding cover, packaging material, magnetic core or iron core, etc. If the inductor is in the state of no current passing, it will try to prevent the current from flowing through it when the circuit is connected; If the inductor is in a state of current flow, it will try to maintain the current when the circuit is disconnected. The inductor is composed of coils surrounded by magnetic materials. When the current passes through the inductor, it will create a magnetic field, which does not like to be changed. Therefore, an inductor is an element that will prevent the current flowing through it from changing; If the current flowing through the inductor is constant, the inductor will feel very comfortable and will not create additional force on the charged particles flowing through it. In this case, the inductor behaves like a normal wire. However, if we try to block the current flowing through the inductor, the inductor will create a force to maintain the current flowing through the inductor. If an inductor is connected end to end, and the circuit has no other resistance, in theory, the current can flow forever without decay. However, unless we use superconductors, any wire itself has resistance, which will cause the final current to decay to zero. The greater the resistance in the circuit, the faster the current decay; However, the larger the inductance of the inductor, the slower the current will decay. Once the current decays to zero, the inductor will try to maintain the current status of zero; This is because the inductor always tries to stop the current flowing through it from changing. Therefore, when we connect the inductor to a circuit, at first, the inductor will generate a force, which will prevent the current from increasing. 
  2022-10-1214:20:45
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