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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.
What is the use of inductors in new energy vehicle electronics? Inductors are one of the three essential basic equipment in the circuit, and are widely used in various electronic fields, such as communication, car, consumption and industry. And with the spread of global intelligence, the intensification of mobile phone professional competition and the rise of new energy vehicles, the demand for inductive equipment will be greatly increased. Now Xiaohao will make a comprehensive introduction to inductors, hoping to help us. What is the use of inductors in new energy vehicle electronics? Here we need to know the important parameters of inductors: Inductance: a physical quantity that produces self inductance. Current: temperature rise current, full current. Q value: quality factor. What is the fundamental principle of inductance? Inductance is the most central equipment in filter circuits and power amplification circuits: generally, according to function, we divide inductance into three categories, mainly including: power inductors; RF inductor; EMI inductor. Among them, the power inductor mainly plays the effects of energy storage, filtering and anti current in the power line, and plays the effects of resonance, filtering, impedance matching and anti current in the signal line. It is called buck if it is connected in series with the power management IC, and boost if it is connected in parallel with the power management IC. RF inductor: it is one of the basic components of high-frequency electronic equipment. It can be used as impedance matching to complete impedance balance, or as RF choke to achieve the effect of filtering. Magnetic bead: it has remarkable effect in filtering high-frequency noise, and is cheap and easy to use. It is mostly used in signal circuit, mainly used in electromagnetic compatibility and absorbing high-frequency signals. What is the use of inductors in new energy automotive electronics? Inductors are used in the car industry. Judging from the function of inductors, inductors are widely used in new energy vehicles.
Variable inductor is an inductor with a saturable magnet core, which belongs to the category of inductors. The magnet core has three iron core columns (42, 43, 44), including a central iron core column (43) and two outer iron core columns. Inductors are components that can convert electrical energy into magnetic energy and store it. The structure of inductor is similar to that of transformer, but there is only one winding. The inductor has a certain inductance, which only blocks the change of current. 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. Inductor is also called choke, reactor and dynamic reactor. The inductor is generally composed of skeleton, winding, shielding cover, packaging material, magnetic core or iron core, etc. Inductors include two categories, self inductors and mutual inductors. When there is current flowing through the coil, a magnetic field will be generated around the coil. When the current in the coil changes, the magnetic field around it also changes correspondingly. The changed magnetic field can make the coil generate induced electromotive force (induced electromotive force) (electromotive force is used to represent the terminal voltage of the ideal power supply of the active element), which is self induction. Inductance can be made of conductive material coiled around the magnetic core, typically copper wire, or the magnetic core can be removed or replaced with ferromagnetic material. The core material with higher permeability than air can restrict the magnetic field more closely around the inductive element, thus increasing the inductance. In terms of the structure of the variable inductor, the induction coefficient of the coil on the outer core column changes with the current passing through the control coil. The saturation of the outer core is changed by controlling the current of the coil. In one embodiment, the induction coefficient of the control coil remains basically constant with the change of the current in the control coil.
