Oscillators – Solid state active element oscillator – Transistors
330 15, 331 60, 331168, H03B 512
In an induction energy transfer device comprising a static power conversion circuit for producing an alternating magnetic field of ultrasonic frequency of the type wherein the static power conversion circuit includes a parallel resonant circuit which comprises a coil which also couples power across an air gap, an improvement in efficiency and power transfer is obtained by including at least two such parallel resonant circuits in the power conversion circuit, one of which resonant circuits is tuned to the third harmonic of said fundamental frequency.
patent: 3134948 (1964-05-01), Wilting
Durr Frank L.
Greene Orville N.
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