Inductor on circuit board symbol
1. Classified by structure
Inductors can be divided into wire-wound inductors and non-wire-wound inductors (multilayer chip, printed inductors, etc.) according to their structure, and can also be divided into fixed inductors and adjustable inductors.
According to the mounting method: there are chip inductors and plug-in inductors. At the same time, the external shielding of the inductor becomes the shielded inductor, and the exposed coil is generally called the unshielded inductor.
Fixed inductors are further divided into hollow electronic watch inductors, magnetic core inductors, iron core inductors, etc. According to their structure and pin mode, they can also be divided into vertical co-directional pin inductors, horizontal axial pin inductors, large and medium-sized inductors, Small and exquisite inductors and chip inductors, etc.
Adjustable inductors are divided into magnetic core adjustable inductance, copper core adjustable inductance, sliding contact adjustable inductance, series mutual inductance adjustable inductance and multi-tap adjustable inductance.
2. Classified by working frequency
Inductance can be divided into high frequency inductance, intermediate frequency inductance and low frequency inductance according to the operating frequency. High-frequency inductors have a large technological gap, and many manufacturers' products are immature. Air-core inductors, magnetic-core inductors and copper-core inductors are generally medium-frequency or high-frequency inductors, while iron-core inductors are mostly low-frequency inductors.
3. Classified by purpose
Inductors can be divided into oscillation inductance, correction inductance, kinescope deflection inductance, blocking inductance, filter inductance, isolation inductance, and compensated inductance according to their purpose. At the same time, Gybis power inductors are used in cases where large currents need to be passed.
Oscillating inductance is divided into TV line oscillation coil, east-west pincushion correction coil and so on.
Kinescope deflection inductors are divided into line deflection coils and field deflection coils.
The choke inductors (also called choke coils) are divided into high-frequency choke coils, low-frequency choke coils, choke coils for electronic ballasts, TV line frequency choke coils, and TV airport frequency choke coils.
Filter inductance is divided into power supply (power frequency) filter inductance and high frequency filter inductance.
The role of inductance: filtering, oscillation, delay, notch; vivid statement: "pass DC, block AC.
Direct current: The so-called direct current means that in a DC circuit, the inductance acts as a wire and does not have any effect.
Resistance to AC: In an AC circuit, the inductor will have impedance, that is, XL, and the current in the entire circuit will become smaller, which will hinder the AC to a certain extent.
The choke effect of the inductor: the self-induced electromotive force in the inductor coil always changes with the current in the coil.
Inductance tuning and frequency selection: inductance coils and capacitors can be connected in parallel to form an LC tuning circuit.
Inductance also has the functions of filtering signals, filtering noise, stabilizing current and suppressing electromagnetic interference.
Various inductor symbols
1. The temperature is too high
The inductor generates heat during the working process, which causes the normal phenomenon when the temperature rises. If the temperature is too high, the temperature of the iron core and the coil is likely to rise, resulting in a change in inductance. Therefore, it is necessary to pay attention to the working environment temperature of the inductor and to select an inductor with appropriate specifications.
2. Magnetic field interference
When the inductor is working, an electromagnetic field is generated around it due to the flow of current. The placement of other components should be as far away as possible from the inductor or at right angles to the inductor to reduce interference. If the requirement is higher, you can switch to an integrated inductor.
3. Distributed capacitance
Between the coils of each layer of the inductor, distributed capacitance will be generated, which can cause high-frequency signal bypass and reduce the actual filtering effect of the inductor. Therefore, special attention should be paid when using inductors for high-frequency filtering.
4. Inductance measurement
When measuring the inductance value and Q value with the instrument, the test lead should be as close as possible to the inductor to ensure the accuracy of the data.
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