| 摘要 |
In order to operate a transformer (24) at its resonant frequency, a circuit part (66, 72, 2, 8) (which produces the alternating voltage sinusoidally) and an electrical feedback path (34, 42, 60) are provided, by means of which the frequency of the sinusoidal alternating voltage is regulated such that the phase of the alternating voltage at the transformer (24) and the phase of the current flowing through the transformer (24) are in phase with one another. <IMAGE>
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