US4038570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic piezoelectric transducer drive circuit
Assignee: Individual
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Filing: 1976-01-26
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Granted: 1977-07-26
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Expires: 1996-01-26
Abstract
Abstract An ultrasonic piezoelectric device is disclosed, comprising a piezoelectric transducer having at least one piezoelectric element having a pair of electrodes on opposite sides of the element, a solid-state amplifier having input and output connections, a driver transformer having a primary winding connected to said output connection of the solid-state amplifier, the driver transformer having a secondary winding connected to the electrodes of the piezoelectric transducer, a feedback transformer having a secondary winding connected to the input connection of the solid-state amplifier, the feedback transformer having a primary winding, and a phase shifting circuit connected between the primary winding of the feedback transformer and the electrodes of the piezoelectric transducer.
Inventors
- 👤 Benton A. Durley, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:48
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0238; B06B1/0246; B06B1/0253; B06B1/06; B06B1/0607; B06B1/0611; B06B1/0618; B06B2201/00; B06B2201/50; B06B2201/55; B06B2201/70; B06B2201/77
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 words
A device for generating ultrasonic energy, comprising a piezoelectric transducer including at least one piezoelectric element having a pair of electrodes on opposite sides of said element, a solid-state amplifier having input and output connections, a driver transformer having a primary winding connected to said output connections of said solid-state amplifier, said driver transformer having a secondary winding connected to said electrodes of said piezoelectric transducer, a feedback transformer having a secondary winding connected to said input connections of said solid-state amplifier, said feedback transformer having a primary winding, a phase shifting circuit connected between said electrodes and said primary winding of said feedback transformer, and a resonating capacitor connected across said secondary winding of said feedback transformer, said resonating capacitor and said secondary winding of said feedback transformer forming a parallel resonant bandpass filter.
Claim 2
Independent Claim
135 words
A device for generating ultrasonic energy, comprising a piezoelectric transducer including at least one piezoelectric element having a pair of electrodes on opposite sides of said element, a solid-state amplifier having input and output connections, a driver transformer having a primary winding connected to said output connections of said solid-state amplifier, said driver transformer having a secondary winding connected to said electrodes of said piezoelectric transducer, a feedback transformer having a secondary winding connected to said input connections of said solid-state amplifier, said feedback transformer having a primary winding, a phase shifting circuit connected between said electrodes and said primary winding of said feedback transformer, and a resonating capacitor connected across said secondary winding of said feedback transformer, said resonating capacitor and said secondary winding of said feedback transformer forming a parallel resonant bandpass filter.
Claim 3
Dependent Claim
25 words
A device according to claim 1, in which said piezoelectric transducer and said parallel resonant bandpass filter have resonant frequencies which are substantially the same.
Claim 4
Dependent Claim
38 words
A device according to claim 1, in which said phase shifting circuit includes a variable element for controlling the magnitude of the feedback signal supplied by said phase shifting circuit to said primary winding of said feedback transformer.
Claim 5
Independent Claim
207 words
A device for generating ultrasonic energy, comprising a piezoelectric transducer including at least one piezoelectric element having a pair of electrodes on opposite sides of said element, a solid-state amplifier having input and output connections, a driver transformer having a primary winding connected to said output connections of said solid-state amplifier, said driver transformer having a secondary winding connected to said electrodes of said piezoelectric transducer, a feedback transformer having a secondary winding connected to said input connections of said solid-state amplifier, said feedback transformer having a primary winding, a phase shifting circuit connected between said electrodes and said primary winding of said feedback transformer, and a resonating capacitor connected across said secondary winding of said feedback transformer, said resonating capacitor and said secondary winding of said feedback transformer forming a parallel resonant bandpass filter, said piezoelectric transducer and said parallel resonant bandpass filter having resonant frequencies which are substantially the same, said phase shifting circuit including a variable potentiometer connected in series with a second capacitor across said electrodes of said piezoelectric transducer, said potentiometer having a variable output element connected to said primary winding of said feedback transformer to vary the magnitude of the feedback signal supplied to said primary winding of said feedback transformer.
Claim 6
Independent Claim
207 words
A device for generating ultrasonic energy, comprising a piezoelectric transducer including at least one piezoelectric element having a pair of electrodes on opposite sides of said element, a solid-state amplifier having input and output connections, a driver transformer having a primary winding connected to said output connections of said solid-state amplifier, said driver transformer having a secondary winding connected to said electrodes of said piezoelectric transducer, a feedback transformer having a secondary winding connected to said input connections of said solid-state amplifier, said feedback transformer having a primary winding, a phase shifting circuit connected between said electrodes and said primary winding of said feedback transformer, and a resonating capacitor connected across said secondary winding of said feedback transformer, said resonating capacitor and said secondary winding of said feedback transformer forming a parallel resonant bandpass filter, said piezoelectric transducer and said parallel resonant bandpass filter having resonant frequencies which are substantially the same, said phase shifting circuit including a variable potentiometer connected in series with a second capacitor across said electrodes of said piezoelectric transducer, said potentiometer having a variable output element connected to said primary winding of said feedback transformer to vary the magnitude of the feedback signal supplied to said primary winding of said feedback transformer.
Claim 7
Dependent Claim
20 words
A device according to claim 4, in which said amplifier comprises a transistor amplifer having a plurality of coupled transistors.
Claim 8
Independent Claim
154 words
A device for generating ultrasonic energy, comprising a piezoelectric transducer including at least one piezoelectric element having a pair of electrodes on opposite sides of said element, a solid-state amplifier having input and output connections, a driver transformer having a primary winding connected to said output connections of said solid-state amplifier, said driver transformer having a secondary winding connected to said electrodes of said piezoelectric transducer, feedback means including a feedback transformer and a phase shifting circuit connected between said electrodes and said input connections of said solid-state amplifier, said feedback transformer having primary and secondary windings, and a resonating capacitor connected in parallel with said secondary winding of said feedback transformer, said resonating capacitor and said secondary winding of said feedback transformer forming a parallel resonant bandpass filter, said piezoelectric transducer having a resonant frequency, said parallel resonant bandpass filter having a resonant frequency corresponding to the resonant frequency of said piezoelectric transducer.
Claim 9
Independent Claim
154 words
A device for generating ultrasonic energy, comprising a piezoelectric transducer including at least one piezoelectric element having a pair of electrodes on opposite sides of said element, a solid-state amplifier having input and output connections, a driver transformer having a primary winding connected to said output connections of said solid-state amplifier, said driver transformer having a secondary winding connected to said electrodes of said piezoelectric transducer, feedback means including a feedback transformer and a phase shifting circuit connected between said electrodes and said input connections of said solid-state amplifier, said feedback transformer having primary and secondary windings, and a resonating capacitor connected in parallel with said secondary winding of said feedback transformer, said resonating capacitor and said secondary winding of said feedback transformer forming a parallel resonant bandpass filter, said piezoelectric transducer having a resonant frequency, said parallel resonant bandpass filter having a resonant frequency corresponding to the resonant frequency of said piezoelectric transducer.
Claim 10
Dependent Claim
32 words
A device according to claim 6, in which said feedback means includes a variable element for controlling the magnitude of the feedback signal supplied to said input connections of said solid-state amplifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |