Method and circuit arrangement for determining a working range of an ultrasonic vibrating unit
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United States of America Patent
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May 23, 2017
Grant Date -
Sep 3, 2015
app pub date -
Sep 9, 2013
filing date -
Sep 10, 2012
priority date (Note) -
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Abstract
Provided is a method for determining an operating range of an ultrasonic vibrating unit (7), which ultrasonic vibrating unit (7) is supplied with electrical power by a generator (2) via an output (2a) and is excited to vibrate ultrasonically, wherein at least constituent parts of the ultrasonic vibrating unit (7), preferably an ultrasonic transducer (8) contained therein, and constituent parts of the generator (2), preferably a matching network (2b) on the output side, form a tuned circuit (2c, 2d). The method is characterized in that a measuring circuit (3) is connected upstream of the output (2a) of the generator (2), via the measuring circuit (3), a voltage (U) is applied to the tuned circuit, and by the measuring circuit (3), at least the phase, preferably magnitude and phase, of an impedance of the tuned circuit are measured, and at least the phase, preferably the phase and magnitude, of the impedance are evaluated in order to determine the working range. The invention further relates to a circuit arrangement for carrying out the aforementioned method.
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