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PFC Inductors Design Considerations

The Precision Factor


PFC (Power Factor Correction) inductors are used in active boost circuits to correct harmonic current distortion in AC to DC converters. The goal is to achieve a Power Factor (PF) as close to 1.0 are possible.


Inductor Selection

  • Switching Frequency
  • Output Power Requirements
  • Temperature Rise/Environment
  • Maximum Peak Desired Current
  • Physical Size
  • Mechanical Mounting Methods
  • Additional Bias Voltage Needs

Inductor Optimization

Proper Core Selection

  • Ferrite
  • Powered Iron
  • Low Loss
  • High Flux
  • MPP
  • Gapped Amorphous Core

Wire & Winding Configurations

  • Balance AC & DC Losses
  • Litz Wire
  • Proximity Effect

Trade-Offs / Challenges

  • Cost
  • Size
  • Performance

E-Core - Inductor, PFC

  • Inductance controlled by Core Gapping
  • High Current
  • Lower Winding Cost
  • PFC Board Mounting

Toroid - Choke,
PFC, IR 1150

  • Inductance Swing
  • Moderate Cost
  • Higher Loss

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