Basic knowledge of inductance (introduction 2)
4. Common mode inductor
The common mode inductor is also called a common mode choke, and is in contrast of the symmetrical winding direction on a closed magnetic ring and the same number of turns. It is often used to filter common mode electromagnetic interference, suppressing electromagnetic waves generated by high speed signal lines, and improves the anti-interference ability of the system.
A common mode inductance is an important component in devices such as switching power supplies, inverters, and UPS power supplies. The working principle is as follows: When the working current flows through two around the opposite coil, two mutually canceled magnetic fields H1, H2, at which time the working current is mainly affected by the coil ohmic resistance and the slight leakage inductance of the negligible operating frequency. Damping. If there is an interference signal flowing over the coil, the coil presents high impedance, producing a strong damping effect, reaching the attenuation interference signal.
The common mode inductance is essentially a two-way speed wave: on the one hand, it is necessary to filter out common mode electromagnetic interference on the signal line. On the other hand, it is necessary to suppress electromagnetic interference in the outside of itself to avoid affecting other electronic devices in the same electromagnetic environment. jobs. The common mode electricity uses ferrite magnetic core, double-wire, with high common modulo noise suppression and low differential noise signal suppression capability, and the operating frequency band impedance is small, and the interference frequency impedance is stable.
5. Timed inductor
The homogeneous inductor is named by the Chinese character "work", which is generally composed of magnetic core or iron core, skeleton, winding group, shield, package material, etc.: Most is the enamel line (or yarn) ) Directly onto the skeleton, then load the core or copper core, the core or the like into the lumen of the skeleton to increase its electrical induction. Commonly used inductors are considered an axial inductance, the application is similar to the axial inductance, but the word inductance can have a larger volume, the rated current naturally increases much; the inductance of the interstitial inductor is usually 0.1 to 100 MH.
6. Drainage
In the electronic circuit, in order to facilitate assembly, it is usually used to encapsulate a plurality of inductances together, and the commonly used exhaust stamps typically have 4 to 8 pins, and there is 2 to 4 capacities inductors in the interior. The circuit composition is the same as the 8P4R exclusion.
7. Magnetic ring inductor
In electronic devices, some magnetic rings can often be seen, which constitutes an inductive coil with the internal connection cable (wire in the cable around a few laps as inductive coils), which is commonly used in electronic circuits. Anti-interference assembly, for high frequency noise, there is a good shield, so it is called an absorption magnetic ring or a magnetic ring inductor, since the magnetic ring is usually made of ferrite material, so it is also known as ferrite magnetic ring (referred to as Magnetic ring).
8. Variable Induction
The variable inductor is mostly adjusted to adjust the magnetic core of the magnetic circuit in the coil to change its electrical inductance.
Insert the magnetic core (or copper core) in the coil, changing the position of the magnetic core can achieve the purpose of changing the amount of electrical. If the magnetic bar antenna coil is a variable inductive coil, its inductance can be adjusted within a certain range; the variable inductor can constitute a tuner with a variable capacitance for changing the resonant frequency of the resonant circuit, such as The row oscillation coil in black and white television is a variable inductor that changes the depth of the core insertion coil (realized by rotating the plastic handle), which can change the amount of inductance to change the travel frequency of the television.
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