Design a PSU filter choke on a gapped core. · in Transformers
dcfilterinductance
Design a PSU filter choke on a gapped core. Three modes: solve for turns, inductance, or both. Calculates air-gap, shim thickness, wire gauge, window fill, DC resistance, voltage drop and copper loss -with a saturation warning when the flux exceeds Bmax.
Gapped-Core Choke Designer — Toroid core with air gapGapped-Core Choke Designer — EI lamination core with air gap
How to use
Three modes — Turns, Inductance, or Design (works out both turns and gap).
What it's for
Design a PSU filter choke on a gapped core — a choke carrying DC, which is exactly why it needs a gap.
You enter
Core dimensions (illustrated), relative permeability, design flux density, DC current, current density, mean length per turn.
You get
Turns, air gap and shim thickness per limb, resulting inductance, A_L, effective permeability, flux density at working current with a saturation warning, wire gauge, window fill, DC resistance, DC voltage drop and copper loss.
The app marks where the gap goes on the core drawing itself.
Tips & warnings
Butting two core halves tight is NOT a zero gap — a residual 0.02–0.05 mm remains. Enter zero only for a solid uncut ring.
