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Efecto Pelicular en Bobinas

Referencia técnica sobre Efecto Pelicular en Bobinas para el diseño, integración e implementación de sistemas de energía inalámbrica.

6 minArtículo 29/50Diseño de Bobinas

Skin Effect in Coils — educational diagram — Fig.: Diagrama educativo de “Skin Effect in Coils”.

Skin effect forces AC current toward the conductor surface as frequency rises, effective cross-section shrinks and AC resistance rises above DC value. Skin depth δ ≈ √(ρ/(πfμ)) sets the scale — at 100 kHz in copper, δ is on the order of 0.2 mm, so solid wire thicker than that wastes interior copper for current.

Coil designers feel skin effect in every multi-kW spiral unless Litz or thin foil is used. Ignoring it predicts optimistic efficiency and cold coils on paper that overheat in the warehouse lane.

01Mitigation

Litz wire with strand diameter below δ (with bundle optimization).
Thin copper foil or PCB traces near skin depth scale.
Parallel conductors with appropriate spacing (careful with proximity).

Skin Effect in Coils — supporting diagram — Fig.: Ilustración de apoyo para “Skin Effect in Coils”.

02Frequency planning

Raising WPT frequency shrinks skin depth — magnetics shrink but conductor loss rises unless conductor technology upgrades. When changing frequency on an existing coil geometry, recompute Rac before assuming the same turn count works.

03Measurement

Compare Rdc and Rac on production samples — ratio tracks process drift.
Temperature rise test correlates with Rac better than Rdc.
Impedance analyzer with four-wire fixture on coil terminals.