US Patent No: 4,551,690

Number of patents in Portfolio can not be more than 2000

Automatic tuning circuit for use in an ultrasonic apparatus

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Importance

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Abstract

An automatic tuning circuit is provided for adjusting the frequency and phase of an oscillatory circuit in a power supply used for providing high frequency electrical energy to an electroacoustic converter. The oscillatory circuit includes an electrically variable inductance means in a feedback loop coupled between the output and an input of the oscillatory circuit and a switching device. The phase relationship of a signal indicative of the voltage across the switching device and a signal indicative of the state of the switching device and hence the current through the switching device is monitored. The inductance of the variable inductance means is adjusted responsive to the phase relationship of the signals indicative of voltage and current through the switching device for maintaining the two signals in phase during operation of the oscillatory circuit.

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First Claim

Related Publications

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Patent Owner(s)

Patent OwnerAddressTotal Patents
BRANSON ULTRASONICS CORPORATIONDANBURY, CT87

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Quist, Eric Roxbury, CT 1 19

Cited Art

Patent Info (Count) # Cites Year
 
CANON KABUSHIKI KAISHA (1)
2003/0137,680 IMAGE PROCESSING APPARATUS, METHOD OF CONTROLLING SAME, AND IMAGE PROCESSING SYSTEM 1998
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
4,371,816 Control circuit for an ultrasonic dental scaler 32 1976

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
ALCON MANUFACTURING, LTD. (2)
5,001,649 Linear power control for ultrasonic probe with tuned reactance 59 1988
4,970,656 Analog drive for ultrasonic probe with tunable phase angle 38 1989
 
METTLER ELECTRONICS CORPORATION (2)
4,966,131 Ultrasound power generating system with sampled-data frequency control 26 1988
5,095,890 Method for sampled data frequency control of an ultrasound power generating system 7 1990
 
ALCON LABORATORIES, 6201 S. FREEWAY, FORT WORTH, TX. 76134 (1)
4,954,960 Linear power control for ultrasonic probe with tuned reactance 35 1987
 
DAELIM INDUSTRIAL CO., LTD. (1)
6,683,016 Supported metallocene catalyst, its preparation method and olefin polymerization therewith 1 2000
 
FIFTH THIRD BANK (1)
4,743,789 Variable frequency drive circuit 71 1987
 
FIRMA J. EBERSPACHER, A CORP. OF THE FED. REP. OF GERMANY (1)
5,113,116 Circuit arrangement for accurately and effectively driving an ultrasonic transducer 28 1989
 
GYRUS MEDICAL LIMITED (1)
6,325,799 Electrosurgical instrument 111 1999
 
ISEN (INSTITUT SUPERIEUR D'ELECTRONIQUE DU NORD) (1)
4,748,365 Method and apparatus for supplying electric power to a vibration generator transducer 17 1986
 
J. EBERSPAECHER GMBH & CO. KG (1)
5,216,338 Circuit arrangement for accurately and effectively driving an ultrasonic transducer 24 1991
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
4,853,579 Drive method for ultrasonic motor providing enhanced stability of rotation 32 1987
 
MKS INSTRUMENTS, INC. (1)
5,195,045 Automatic impedance matching apparatus and method 98 1991
 
NIKON CORPORATION (1)
4,812,699 Drive control device in an ultrasonic vibration motor 14 1987
 
OLYMPUS OPTICAL CO., LTD. (1)
5,042,460 Ultrasonic treating apparatus with device for inhibiting drive when ultrasonic element is determined to be defective 12 1989
 
SIEMENS AKTIENGESELLSCHAFT (1)
6,212,131 Ultrasound transmitting circuit and ultrasound transmitting system having a plurality of ultrasound transmitting circuits 1 1999
 
THORLABS, INC. (1)
7,511,403 High-powered actuators and actuating systems for extended range and precise positioning 0 2006
 
TOKYO ELECTRON LIMITED (1)
6,740,842 Radio frequency power source for generating an inductively coupled plasma 6 2002
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
4,849,872 Process and apparatus for phase-regulated power and frequency control of an ultrasonic transducer 11 1988