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Métodos con Analizador de Impedancia

Referencia técnica sobre Métodos con Analizador de Impedancia para el diseño, integración e implementación de sistemas de energía inalámbrica.

6 minArtículo 47/50Diseño de Bobinas

Impedance Analyzer Methods — educational diagram — Fig.: Diagrama educativo de “Impedance Analyzer Methods”.

Impedance analyzers measure Z(f) = R(f) + jX(f) on coils, extracting L, Rac, and Q at the operating frequency. For coupled TX/RX, two-port S-parameter or mutual-Z methods yield k and M without full power transfer tests.

Calibration at the fixture plane removes cable and probe parasitics — critical when milliohm Rac matters.

01Single-coil measurement

Series or parallel equivalent circuit choice documented per standard used.
Drive level low enough to avoid ferrite heating during sweep.
Open/short/load calibration on the production fixture.

Impedance Analyzer Methods — supporting diagram — Fig.: Ilustración de apoyo para “Impedance Analyzer Methods”.

02Coupled measurement

Measure L1, L2 with partner open or shorted as topology requires. Extract k from mutual inductance or from split resonance frequencies in weak coupling approximations — know when approximation breaks. Align coils on gauge blocks for repeatable gap.

03Pitfalls

Clip leads forming loops that pick up ambient noise.
Measuring at wrong frequency (only 1 kHz LCR meter data).
Ignoring fixture capacitance masking SRF.