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Advertise DC resistance only; frame f>0 as a skin-only estimate
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Skin resistance is a small fraction of real AC impedance (proximity
and inductance dominate), so AC must not appear in the descriptions.
README headline, PCM/plugin metadata, pyproject, dialog note, CLI
help and the summary label now all say: skin-only lower bound on the
resistance rise, not an AC impedance simulation.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
janik
2026-07-22 16:34:21 +07:00
parent d7c3089031
commit b806d31a9a
7 changed files with 29 additions and 21 deletions
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README.md
+17 -11
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@@ -1,15 +1,17 @@
# Fill Resistance — KiCad 10 plugin
Computes the **DC or AC resistance of copper zone fills and traces**
Computes the **DC resistance of copper zone fills and traces**
between two contacts, **single- or multi-layer**: the chosen net's fills
(teardrops included) and tracks on the selected copper layers are
solved as coupled finite-difference sheets linked by the net's **via
and through-hole-pad barrels** (18 µm plating, configurable). At a user-set **frequency** the exact 1D foil/barrel
skin-effect correction is applied (AC results are a rigorous lower
bound; see *Model & limits*). Shows per-layer rasterized maps,
potential, current density, and **power density**, and reports **per-via
currents** (via ampacity!) and total dissipation at a **selectable test
current**. PNGs + a text summary are saved per run.
and through-hole-pad barrels** (18 µm plating, configurable). Shows
per-layer rasterized maps, potential, current density, and **power
density**, and reports **per-via currents** (via ampacity!) and total
dissipation at a **selectable test current**. PNGs + a text summary are
saved per run. An optional **skin-effect correction** (exact 1D
foil/barrel solution at a user-set frequency) estimates the resistive
skin rise only — it is **not** an AC impedance simulation (no proximity
effect, no inductance; see *Model & limits*).
![Current density on a two-layer demo net](docs/img/demo-current.png)
*Real output on a synthetic two-layer net: current from a soldered
@@ -236,10 +238,14 @@ SWIG API. Requires KiCad **10.0.1+**.
isolated foil), and the analogous correction for the 18 µm barrel wall.
Enter one frequency per run (e.g. a switching harmonic, with its RMS
amplitude as the test current); suffixes `k`/`M` are accepted.
**Caveat:** only through-thickness crowding is modeled. Lateral
(proximity-effect) redistribution needs a magneto-quasistatic solver
and is not captured — since the resistance-driven distribution is the
minimum-dissipation one, AC results are a rigorous **lower bound**.
**Caveat:** this is **not an AC impedance simulation** — skin
resistance is only a small part of real AC behavior. Only
through-thickness crowding is modeled: lateral (proximity-effect)
redistribution needs a magneto-quasistatic solver and is not
captured — since the resistance-driven distribution is the
minimum-dissipation one, the f > 0 resistance is a rigorous **lower
bound** — and inductance, usually the dominant term of a real AC
impedance, is absent entirely.
Rule of thumb for 70 µm foil: skin is negligible below ~300 kHz
(δ = 173 µm at 142 kHz), ~+11 % at 1 MHz. At f > 0 the |J| maps are
referenced to the skin-reduced conduction-equivalent thickness