INDUSTRY COMPONENT

Power Inductor

Power inductor is a passive electronic component that stores energy in a magnetic field when electric current flows through it, used for filtering, energy storage, and power conversion in power management circuits.

Component Specifications

Definition
A power inductor is an electromagnetic component consisting of a coil wound around a magnetic core, designed to handle high currents and store significant magnetic energy. It operates based on Faraday's law of electromagnetic induction, resisting changes in current flow and providing impedance to alternating current while allowing direct current to pass. In power management circuits, it serves critical functions in DC-DC converters, voltage regulators, and switching power supplies by smoothing current ripples, filtering noise, and enabling efficient energy transfer between different voltage domains.
Working Principle
Power inductors work on electromagnetic induction principles. When current flows through the coil, it generates a magnetic field around the conductor. This magnetic field stores energy proportional to the square of the current (E=½LI²). When the current changes, the inductor opposes this change by inducing a back electromotive force (EMF) according to Lenz's law. In switching power supplies, inductors alternate between storing energy during the switch-on phase and releasing it during the switch-off phase, enabling voltage conversion and regulation.
Materials
Copper or aluminum wire for windings, ferrite or powdered iron cores for magnetic paths, epoxy or phenolic resin for encapsulation, nickel or tin plating for termination protection. Core materials selected based on required permeability, saturation flux density, and operating frequency range.
Technical Parameters
  • Tolerance ±10% to ±20%
  • Inductance 1μH to 1000μH
  • DC Resistance 1mΩ to 100mΩ
  • Current Rating 1A to 100A
  • Saturation Current 2A to 150A
  • Operating Temperature -40°C to +125°C
  • Self-Resonant Frequency 1MHz to 50MHz
Standards
IEC 62024, IEC 62333, ISO 9001, AEC-Q200

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Power Inductor.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Magnetic saturation leading to sudden inductance drop
  • Thermal runaway from excessive current
  • Mechanical vibration causing audible noise
  • EMI radiation affecting nearby circuits
  • Insulation breakdown at high voltages
FMEA Triads
Trigger: Core material saturation
Failure: Sudden loss of inductance, causing regulator instability and output voltage collapse
Mitigation: Select inductors with saturation current ratings 20-30% above maximum operating current, implement current limiting circuits
Trigger: Excessive DC resistance
Failure: Reduced efficiency, thermal overheating, potential component failure
Mitigation: Choose inductors with low DCR specifications, implement thermal monitoring, ensure adequate cooling
Trigger: Mechanical stress on windings
Failure: Open circuits or intermittent connections, causing complete circuit failure
Mitigation: Use inductors with reinforced construction, implement vibration damping in mounting, perform mechanical stress testing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Inductance tolerance typically ±10% to ±20%, current ratings must be derated by 20% for high-temperature operation
Test Method
Inductance measured at 100kHz with 0.1V RMS, DC resistance measured with 4-wire method, saturation current tested at 30% inductance drop point

Buyer Feedback

★★★★☆ 4.5 / 5.0 (23 reviews)

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Power Inductor meets all ISO standards."

"Standard OEM quality for Computer, Electronic and Optical Product Manufacturing applications. The Power Inductor arrived with full certification."

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Frequently Asked Questions

What is the difference between a power inductor and a signal inductor?

Power inductors are designed to handle high currents (typically >1A) and store substantial magnetic energy, with lower DC resistance and higher saturation current ratings. Signal inductors handle smaller currents (<1A) and prioritize precise inductance values and quality factors for filtering and tuning applications.

How do I select the right power inductor for my DC-DC converter?

Key selection parameters include required inductance value, maximum DC current (consider both RMS and peak currents), saturation current rating, DC resistance (affects efficiency), operating frequency range, physical size constraints, and temperature requirements. Always ensure the inductor's saturation current exceeds your application's peak current.

What causes power inductor overheating?

Overheating typically results from excessive current exceeding the inductor's rating, high DC resistance causing I²R losses, core losses at high frequencies, poor thermal management, or operating beyond specified temperature ranges. Proper derating and thermal design are essential.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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