Question
What causes inductor saturation?
Answer Options
- A) Operation at too high a frequency
- B) Selecting a core with low permeability
- C) Operation at excessive magnetic flux
- D) Selecting a core with excessive permittivity
Correct Answer: C
Explanation
Inductor saturation is a non-linear effect that occurs in inductors with magnetic cores (ferrite, powdered iron). It is a point of failure where the core material can no longer concentrate the magnetic field, severely limiting the inductor’s performance.
Inductor saturation is caused by operation at excessive magnetic flux (which is directly proportional to the DC or peak AC current flowing through the coil). When the magnetic field becomes too strong, the core material loses its ability to increase permeability, and the inductance value drops drastically. This sudden loss of inductance is typically undesirable, leading to signal distortion, a loss of filtering capability, and potentially damaging current spikes.
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