Inductors
Inductor is a device that converts electrical energy into magnetic energy and stores it. The structure of the inductor is similar to that of a transformer, but with only one
winding. The inductor has a certain inductance, which only impedes the change of current. If the inductor is in the state of no current passing through, it will try to prevent
the current from flowing through it while the circuit is on; If the inductor is in the state of current passing through, it will try to maintain the current when the circuit is
disconnected. Inductors are also called choke, reactor, dynamic reactor.
Feature
Inductors in the circuit mainly play the role of filtering, oscillation, delay, trap, and so on, but also screen signals, filter noise, stabilize the current and inhibit electromagnetic
wave interference. The most common function of inductors in circuits is to form LC filter circuits together with capacitors. The capacitor has the characteristic of "blocking DC,
blocking AC", while the inductor has the function of "blocking DC, blocking AC". If the direct current accompanied by many interference signals is passed through the LC filter
circuit, then the AC interference signal will be consumed by the inductance into heat energy; When the pure direct current flows through the inductor, the AC interference
signal is also changed into magnetic induction and thermal energy, and the higher frequency is most easily impeded by the inductor, which can inhibit the higher frequency
interference signal.
Inductors have the property of preventing the passage of alternating current and allowing direct current to pass smoothly, and the higher the frequency, the greater the coil
impedance. Therefore, the main function of the inductor is to isolate and filter the AC signal or to form a resonant circuit with capacitors and resistors.
effect
The chip inductor is an electromagnetic induction element wound by an insulated wire. It is a commonly used inductor. The role of the chip inductor: pass DC to block AC
This is a simple way of saying that the AC signal is isolated, filtered or composed of a resonant circuit with capacitors, resistors, etc. The role of tuning and frequency
selection inductors: inductors and capacitors in parallel can form LC tuning circuits. Any current in the circuit of the chip inductor will generate a magnetic field, and the
magnetic flux of the magnetic field will act on the circuit.
When the current through the chip inductor changes, the DC voltage generated in the chip inductor will prevent the current change. When the current through the inductor increases,
the inductor generates the self-induced electromotive force in the opposite direction of the current, preventing the increase of the current, and at the same time, part of the electric
energy is converted into magnetic field energy stored in the inductor; When the current through the inductor is reduced, the self-induced electromotive force is in the same
direction as the current, preventing the reduction of the current while releasing the stored energy to compensate for the reduction of the current. Therefore, after inductive
filtering, not only the pulsation of load current and voltage is reduced, the waveform becomes smooth, and the on-angle of the rectifier diode is increased.
The role of inductors 1: The color ring inductor has a choke effect: the copper core in the color ring inductor coil is always resistant to the current change in the coil. The color
ring inductance has a blocking effect on the AC current used in the circuit, and the size of the blocking effect is called the inductive reactance XL, and the unit is ohms. The
relationship between it and inductance L and AC frequency f is XL=2πfL, and the color ring inductance can be mainly divided into high frequency choke coil and low frequency choke coil.
The role of inductance 2: The color ring inductance has a tuning and frequency selection role: the color ring inductance and the electrolytic capacitor can be composed of
LC tuning circuit in parallel. When the color ring inductor resonates, the inductance and capacitive reactance of the circuit are equivalent and reverse, that is, the natural
oscillation frequency of the circuit f0 is equal to the frequency f of the non-AC signal, then the inductance and capacitive reactance of the circuit are equal, and the use of
the color ring inductance is generally not very high, and the color ring inductance used in the circuit is generally more stable.
The role of inductance 3: The maximum of the color ring inductance is mainly used to screen signals, filter noise, stabilize current and inhibit electromagnetic wave interference.
The basic function of the color ring inductor is to charge and discharge, but many circuit phenomena that are extended by this basic charge and discharge function make the
color ring inductor have various uses. Now the color ring inductance has been used by the majority of customers, and the role of the small inductance is not negligible.
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