Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2008-03-18
2008-03-18
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
Reexamination Certificate
active
07345401
ABSTRACT:
In a method and a circuit arrangement for operating an ultrasound oscillator with a constant oscillation amplitude wherein an excitation voltage U, whose frequency is disposed outside the resonance frequency of an ultrasound oscillation system, is applied to the ultrasound oscillator which includes components forming therewith an oscillation circuit for generating an excitation current I, whose size is adjusted by changing the frequency of the excitation voltage U to a predetermined value, the level of the excitation voltage U is detected by a voltage sensor and the predetermined value of the size of the excitation current I is set depending on the level of the excitation voltage U.
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Bach Klaus J.
Dougherty Thomas M.
Martin Walter Ultraschalltechnik AG
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