| 摘要 |
A device for controlling a resonant ultrasound piezoelectric stage, including: a first stage of increasing a DC voltage to an intermediate DC voltage, a second modulation stage including an inductor connected to the intermediate DC voltage and a first switching transistor for selectively controlling a phase of charging the inductor and a phase of transferring the energy stored in the inductor in response to a first stream of command pulses, to generate an excitation voltage of the piezoelectric stage. The second stage includes a second switching transistor connected in series between the drain of the first transistor and a terminal of the inductor, suitable for limiting energy stored in the inductor during the charging phase in response to a second stream of command pulses, so as to reduce an amplitude of the excitation voltage.
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