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Etapas Amplificador Clase D

Referencia técnica sobre Etapas Amplificador Clase D para el diseño, integración e implementación de sistemas de energía inalámbrica.

6 minArtículo 20/50Electrónica de Potencia

Class-D Amplifier Stages — educational diagram — Fig.: Diagrama educativo de “Class-D Amplifier Stages”.

Class-D amplification means high-efficiency switching output stages with filtered or resonant load paths — the same conceptual bucket as most WPT transmitters. The coil tank often provides the filtering; the inverter switches at high efficiency while the resonator selects fundamental power delivery.

Understanding Class-D helps debug distortion-like artifacts when control resolution, dead time, or modulation limits create unwanted harmonics in coil current.

01Parallels to WPT

Switching stage plus LC filter equals resonant power delivery.
Modulation (PWM, phase, frequency) sets effective coil voltage.
Loop bandwidth and stability matter for load transients on the receiver.

Class-D Amplifier Stages — supporting diagram — Fig.: Ilustración de apoyo para “Class-D Amplifier Stages”.

02Differences from audio

Power levels and currents far exceed audio Class-D. Magnetics are the functional load, not a speaker voice coil. Safety, isolation, and EMC dominate — not THD to the ear. Still, spectral content of coil current affects loss and EMI similarly to harmonic distortion in amplifiers.

03Practical use

Borrow Class-D driver IC concepts cautiously — WPT needs higher voltage and current.
Simulate harmonic content under phase modulation used for power control.
Do not confuse marketing “Class-D wireless” with a specific standard topology.