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:
Aug. 05, 2014
Filed:
Aug. 20, 2010
Neven Nikolic, Mississauga, CA;
Manja Kircanski, Toronto, CA;
Nenad Kircanski, Toronto, CA;
Amir M. Sadri, Toronto, CA;
Milija Timotijevic, Toronto, CA;
Zhiliang Xu, Mississauga, CA;
Neven Nikolic, Mississauga, CA;
Manja Kircanski, Toronto, CA;
Nenad Kircanski, Toronto, CA;
Amir M. Sadri, Toronto, CA;
Milija Timotijevic, Toronto, CA;
Zhiliang Xu, Mississauga, CA;
Bio-Rad Laboratories, Inc., Hercules, CA (US);
Abstract
A system for controlling an ultrasonic transducer utilizes an indication of the relative phase of the voltage on the transducer and the current passing through the transducer to control the relative phase to a value that has been preselected to correspond to resonance of an electromechanical system that includes the ultrasonic transducer. In one example application, the system includes a waveform generator that produces an oscillating signal, and the frequency of the oscillating signal is adjustable under control of the control processor. The control processor adjusts the frequency of the oscillating signal according to a proportional control law at least some of the time, and according to a proportional-integral control law at least some of the time. The control processor may also control the amplitude of the oscillation of the ultrasonic transducer.