The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 25, 2020
Filed:
Jun. 08, 2017
Covidien Lp, Mansfield, MA (US);
James A. Gilbert, Boulder, CO (US);
Covidien LP, Mansfield, MA (US);
Abstract
An ultrasonic transducer and generator assembly and method for controlling the assembly are disclosed. The method includes sensing a current signal and a voltage signal at the transducer, differentiating the voltage signal, multiplying the differentiated voltage signal by a bulk capacitance value to determine a bulk capacitance current signal, determining the difference between the current signal and the bulk capacitance current signal to determine a motional current signal corresponding to mechanical motion of the transducer, determining an updated bulk capacitance value based on the determined motional current signal and the bulk capacitance current signal, generating a transducer signal based on the motional current signal, and driving the transducer with the transducer signal. The method may further include filtering the difference between the current signal and the bulk capacitance current signal using a band-pass filter. The updated bulk capacitance may be determined using a least mean squares adaptive filter.