Artículo wiki · Colección 03

Bobinado Bifilar

Referencia técnica sobre Bobinado Bifilar para el diseño, integración e implementación de sistemas de energía inalámbrica.

6 minArtículo 22/50Diseño de Bobinas

Bifilar Winding — educational diagram — Fig.: Diagrama educativo de “Bifilar Winding”.

Bifilar winding places two conductors side by side with equal turns, often wound together so magnetic fields from each cancel for common-mode current while reinforcing differential-mode flux. In WPT, bifilar techniques appear in compensation inductors, cancellation windings, and some coil structures aimed at reducing leakage inductance to a defined value.

When used in the main power coil, bifilar arrangements must preserve the intended coupling to the partner coil — not all bifilar patterns are equal; some target EMI cancellation on the cable exit instead.

01Applications

Leakage-controlled transformers in multi-stage WPT converters.
Cancellation windings to reduce far-field EMI from lead-out cables.
Symmetric current paths in dual-half-bridge coil drives.

Bifilar Winding — supporting diagram — Fig.: Ilustración de apoyo para “Bifilar Winding”.

02Manufacturing

Twist pitch and spacing affect capacitance between bifilar partners — measure L and C on samples. Terminations must pair strands correctly; swapping one lead inverts the intended field. Litz bifilar bundles require vendor specification of twist direction.

03Pitfalls

Accidental short between bifilar strands at a nick point.
Unequal strand length in termination creating circulating current.
Confusing bifilar cancellation with the main coupling winding role.