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Home / News / Knowledge / Sample Preparation for Failed Power Inductors

Home / News / Knowledge / Sample Preparation for Failed Power Inductors

Sample Preparation for Failed Power Inductors

The working principle of power inductors is based on Faraday’s Law of Electromagnetic Induction, with the core being the mutual conversion between electrical energy and magnetic energy.

Their function is to store magnetic field energy and achieve filtering, energy storage, current chokes, resonance, and other purposes. In short, power inductors realize the mutual conversion of electrical and magnetic energy through electromagnetic induction, and use self-inductance to impede current changes—thus achieving DC conduction, AC blocking, energy storage, filtering, and other functions in circuits.

Widely used in consumer electronics (power management of smartphones and tablets), industrial equipment (power modules of control boards), automotive electronics (on-board power systems), communication devices (signal processing of routers), and other fields, they play a key role in circuits such as DC-DC conversion, power supply noise filtering, and signal resonant frequency selection.

Below are the sample preparation parameters for failed power inductors and an appreciation of metallographic microscopic effects:

1️⃣ Grinding: Sandpaper P800 → P1200 → P2000 → P4000

2️⃣ Rough polishing: SC + 3μm polycrystalline diamond

3️⃣ Final polishing: ZN + SO-A439 polishing fluid

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