Magnetic induction coil in the circuit to play the role of filtering, oscillation, etc., the use of electrical energy into magnetic will be stored, like a transformer, there is a certain degree of inductance, but does not lose electrical energy. Generally no current through, it has the function of obstruction, there is a current situation, it can keep the current constant.
An inductive coil is a device that works by utilizing the principle of electromagnetic induction, and has the opposite electrical characteristics of a capacitor, "passes low frequencies and blocks high frequencies". Coil is the most commonly used device in the circuit, it is made of wire wrapped around an insulated tube, the material of the wire will affect the role of the coil. It is also one of the commonly used components in household appliances, instruments and other electronic products, and is an electronic component that works by utilizing the principle of electromagnetic induction. The following to specify the role of the inductor coil, considerations and types that,The role of inductive coils.
1、Flow blocking effect
The self-induced electromotive force in an inductive coil always resists the change in current in the coil. The inductor coil has a hindering effect on the AC current, and the magnitude of the hindering effect is called the inductive resistance x in ohms. It is related to the inductance and the frequency of the alternating current as x1=2nf. Inductors can be mainly categorized into high-frequency current-blocking coils and low-frequency current-blocking coils.
2、Tuning and frequency selection role
An inductive coil connected in parallel with a capacitor can form a tuned circuit. That is, the circuit's intrinsic oscillation frequency 1 and the frequency of non-AC signals are equal, the circuit's inductive reactance and capacitive reactance are also equal, so the electromagnetic energy in the inductor, capacitor back and forth oscillation, which 1c circuit resonance phenomenon.
Factors affecting coil inductance
1, The inductance value of the total circuit with different connections is different, when the four coils are connected in parallel, the inductance value is the smallest and the current in the circuit is the largest; when the four coils are connected in series, the inductance of the circuit is the largest and the current in the circuit is the smallest. Whether from the size of the current flowing through each coil or from the distribution of energy in the coil analysis, the choice of four coils in series connection is the most appropriate.
2, For coils with iron core, when two coils are placed on the same iron core, the iron core will have a decisive influence on the mutual inductance of the two coils, and because of the iron core of this word is non-linear, so its inductance value is not unique, different inductance values under different currents.
Inductive coils are used for current blocking, tuning, and frequency selection. The common factor that affects the inductance of the coil is the material, and the inductance produced is different for different connections.
Two winding methods available for indctive coils
Single-layer winding method
It is to wrap the wire turns of the inductor coil in a single layer on the outer surface of the insulated pipe, and the single layer winding method is divided into indirect winding and tight winding, indirect winding is generally used in some high-frequency resonance circuits, because this way of winding method can reduce the capacitance of the high-frequency resonance line diagram, and at the same time can stabilize some of its characteristics. The tight winding method is based on a small range of resonant coils.
multilayer winding
The inductance of the coil is relatively large, the winding method of the coil is a multi-layer winding method, the multi-layer winding method includes dense winding and honeycomb winding two types, the dense winding method is more tightly arranged, need to be distributed layer by layer, the capacitance generated by the coil is relatively large, the honeycomb winding method is arranged at a certain angle, the arrangement is not very flat, but compared with the tightly winding method, its capacitance is relatively small. However, compared with the tight winding method, its capacitance is smaller. For some high-voltage resonant circuits, when winding inductor coils, it is necessary to comply with the value of current and the degree of voltage resistance between the coils, and we also have to take into account the heat condition of the coils when winding inductor coils.
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Problems and solutions about inductive coils
Problem 1: Unstable quality of inductor coils
The unstable quality of the inductor coil is usually due to the material of the inductor coil, the manufacturing process, the working environment and other factors, resulting in the unstable quality of the inductor coil, which will lead to the circuit work abnormally.
Solution: Select high-quality inductor coil components, require manufacturers to provide relevant specifications and quality inspection certificates, and avoid selecting low-priced, low-quality inductor coils. When selecting inductive coils, pay attention to its design, manufacturing and application factors to ensure that the quality of inductive coils is stable and reliable.
Problem 2: Inductor coil impedance mismatch
Inductor coil impedance mismatch is usually due to a lack of precise matching between the inductor coil and other components, resulting in an unstable or improperly working circuit.
Solution: In the circuit design, precise impedance matching should be performed on the inductor coil and other components to ensure the circuit is stable and reliable. Mathematical modeling, simulation and simulation methods can be used for debugging and optimization to ensure that the matching between the inductor coil and other components is optimal.
Problem 3: Magnetic noise from inductive coils
The work of the inductor coil will produce a certain magnetic field, if the working frequency of the inductor coil is higher or the working environment of the inductor coil is worse, it will produce a certain amount of magnetic noise, which will affect the working effect of the circuit.
Solution: Adopt shielding measures, such as wrapping the shielding layer outside the inductor coil or using magnetic shielding materials for wrapping. You can also increase the spacing between the inductor coil and other components to reduce the interference range of the magnetic field.
Inductive coils play an important role in electronic circuits and have a crucial impact on the stability and performance of the circuit. Only by carefully analyzing the problem and scientifically solving the problem, can we better apply inductive coils and realize the efficient, stable and reliable work of the circuit.
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