Comparison of Design Types

Choke coil

Closed magnetic circuit

Low stray fields, high magnetic efficiency, and compact dimensions. The preferred choice for high EMC requirements and maximum efficiency.
Linearly wound

Flexible & Adjustable

For cylindrical or rectangular bobbin bodies, with rod, EI, UI, or ferrite cores. Defined air gaps enable precise design and trimmable configurations.
Multiple-stage throttle

Single, dual, or multiple

Can be configured as a single, dual, or multiple choke depending on the application—for common-mode, push-pull, or combined filtering functions.

Function Type

Line choke
Limits current spikes, reduces power line disturbances, and improves power quality to protect connected devices

Storage choke
Stores magnetic energy in switching power supplies and DC/DC converters—a key component in power electronics.

Filter & Interference Suppression Chokes
Suppress high-frequency interference and electromagnetic emissions—as common-mode or differential-mode chokes.

Materials & Components

Winding wire
Enameled copper wire (standard), flat wire for high currents, aluminum conductors for weight-optimized designs

Core material (50/60 Hz)
Silicon steel sheets – for mains frequencies and higher power ratings

Core material (HF)
Ferrite – low losses at high switching frequencies (SMPS, PFC, LLC)

Powder cores 
Iron powder – for defined saturation characteristics and consistent behavior under load

Nanocrystalline / Amorphous
Particularly low losses, high permeability—for demanding EMC and filter applications

Insulation
Temperature-resistant coating systems or insulating materials depending on temperature class and dielectric strength

Custom Design

  • Inductance & Saturation Current
  • Efficiency & Power Loss
  • Core Material & Air Gap
  • Design & Dimensions
  • Thermal Behavior
  • EMC Properties
  • Frequency Range
  • Safety Requirements & Standards
  • Connection Type
  • Noise Level (Acoustics)

Request for
Custom Manufacturing

Marcel Bürli will guide your projects from the initial inquiry through to delivery. With his in-depth expertise in choke technology and inductive components for power electronics, he will work with you to find the optimal solution—whether it’s a power choke, storage choke, or noise-suppression choke.

Please let me know your technical requirements—I’ll design the right choke for your frequency range and power rating.