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The original ring inductor works like this.
Aug 29, 2017

The original ring inductor works like this.

The toroidal inductance is the ratio of the magnetic flux passing around the inside of the wire when the communication current flows through the wire, and the magnetic flux of the wire and the current that produces the flux.

When the DC current flows through the inductor, only a fixed magnetic line of force appears around it, and it does not change with time; however, when the communication current flows through the coil, magnetic lines of force that change with time will appear around it. According to the law of Faraday's electromagnetic induction---magnetic generation, the modified magnetic lines will induce an electric potential at both ends of the coil. This induced potential is equivalent to a "new power supply". When the closed loop is formed, the induced current is induced to generate current. The total number of lines of magnetic force generated by the induced current is determined by the law to prevent the magnetic line from being changed. The magnetic field line changes are derived from the modification of the external alternating current power supply. Therefore, from the objective effect, the inductance coil has the characteristic of preventing the current change in the communication circuit. Inductor coils have similar characteristics to the inertia in mechanics. They are electrically named "self-inductive". Generally, sparks occur when the knife switch is turned on or the knife switch is turned on. This self-inductance occurs. A very high induced potential is formed.

In general, when the inductor coil is connected to the communication power supply, the magnetic lines of force inside the coil will be changed at any time as the current changes, causing the coil to be electromagnetically induced. This electromotive force generated by the change of the coil's own current is called "self-induced electromotive force".

It can be seen that the inductance is only one parameter related to the number of turns of the coil, the shape of the coil, and the medium. It is the measurement of the inertia of the inductor and is independent of the applied current.

Inductive coil choke effect: The self-induced electromotive force in the coil of the inductor is always resistant to the current in the coil. The inductor coil has a blocking effect on the communication current, and the effect of the block is called the anti-XL, and the unit is ohm. The relationship between the inductance L and the communication frequency f is XL=2πfL, and the inductor can be mainly divided into a high frequency choke coil and a low frequency choke coil.

Tuning and frequency selection effects: The inductor coil and the capacitor are connected in parallel to form an LC tuning circuit. That is, the natural vibration frequency f0 of the circuit is equal to the frequency f of the non-communication signal, and the inductive reactance and capacitive reactance of the loop are also flat, so the electromagnetic energy vibrates back and forth in the inductor and the capacitor, and the resonant appearance of the LC loop. At the time of resonance, the inductive reactance and capacitive reactance of the circuit are reversed, the inductance of the total current of the loop is the smallest, and the current is the largest (refer to the communication signal of f="f0"). The LC resonant circuit has the effect of selecting a frequency and can A communication signal of frequency f is selected.

The inductor also has the effects of selecting signals, filtering noise, stabilizing current, and  electromagnetic wave disturbance.

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