Main performance indicators of power coils

Distributed capacitance

Any inductance coil, between turns and turns, between layers and layers, between the coil and the reference ground, between the coil and the magnetic shield, there is a certain capacitance, these capacitors are called the distributed capacitance of the inductance coil. If these distributed capacitors are combined together, they become an equivalent capacitor C in parallel with the inductor coil. The existence of distributed capacitance reduces the Q value of the coil and the stability becomes worse, so the smaller the distributed capacitance of the coil, the better.

Rated current

The rated current refers to the maximum current value that the inductor will allow to pass under normal operation. If the operating current exceeds the rated current, the inductor will change the performance parameters due to heat, and even burn due to overcurrent.

Allowable deviation
Allowable deviation refers to the allowable error between the nominal inductance on the inductor and the actual inductance.

Inductors generally used in oscillating or filtering circuits require high accuracy, and the allowable deviation is ±0.2[%]~±0.5[%]; The precision requirements for coupling and high frequency choke coils are not high. The allowable deviation is ±10[%]~15[%].

Classified editing broadcast

The classification of inductors commonly used in circuits is roughly as follows:
Classification by inductance form: fixed inductance, variable inductance.
Classification according to the properties of the magnetic permeability: hollow coil, ferrite coil, iron coil, copper coil.
Classification by working nature: antenna coil, oscillation coil, choke coil, trap coil, deflection coil.
According to the winding structure classification: single coil, multi-layer coil, honeycomb coil, tightly wound coil, interwound coil, spun coil, honeycomb coil, chaotic coil.

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