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US4141608A
Expired / Lapsed
US
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Circuitry for driving a non-linear transducer for ultrasonic cleaning
Assignee: L AND R Manufacturing Co
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Filing: 1977-11-10
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Granted: 1979-02-27
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Expires: 1997-11-10
Abstract
Abstract A circuit is disclosed for providing an 80 kilohertz sine wave to an ultrasonic transducer which includes an 80 kilohertz square wave generator driving a transistor having the primary of a transformer in its collector circuit. The secondary of the transformer drives a power transistor which has the transducer drive circuitry in its collector circuit. The transducer drive circuitry includes a transformer whose primary is connected in series with an inductor. The secondary of the transformer drives the transducer and has a capacitor connected thereacross. A third winding of the transformer is connected to have its output rectified to serve as a power supply for the square wave generator.
Inventors
- 👤 Franklin E. Breining
- 👤 Franklin H. Edelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:49
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0238; B06B1/0246; B06B1/0253; B06B2201/00; B06B2201/40; B06B2201/70; B06B2201/71
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
In combination: a non-linear ultrasonic transducer having first and second terminals; a capacitor connected between said first and second terminals to form a parallel circuit with said non-linear transducer; means for exhibiting an inductive reactance in series with said parallel circuit to thereby form a non-linear series resonant circuit having a series resonant frequency; and means for applying a square wave having a fundamental frequency substantially equal to said series resonant frequency across said series resonant circuit; said means for applying said square wave includes a transistor and said means for exhibiting said inductive reactance includes an inductor connected in the collector circuit of said transistor, and a transformer having a primary and a secondary; said primary being connected to said inductor and said secondary being connected across said parallel circuit.
Claim 2
Dependent Claim
131 words
In combination: a non-linear ultrasonic transducer having first and second terminals; a capacitor connected between said first and second terminals to form a parallel circuit with said non-linear transducer; means for exhibiting an inductive reactance in series with said parallel circuit to thereby form a non-linear series resonant circuit having a series resonant frequency; and means for applying a square wave having a fundamental frequency substantially equal to said series resonant frequency across said series resonant circuit; said means for applying said square wave includes a transistor and said means for exhibiting said inductive reactance includes an inductor connected in the collector circuit of said transistor, and a transformer having a primary and a secondary; said primary being connected to said inductor and said secondary being connected across said parallel circuit.
Claim 3
Dependent Claim
64 words
The combination as defined in claim 1 in which said means for applying said square wave further includes a square wave generator for providing said square wave to said transistor and said transformer includes a third winding; said combination further including means for rectifying the signal provided by said third winding, and applying the same as a power supply to said square wave generator.
Claim 4
Dependent Claim
43 words
The combination as defined in claim 2 in which said means for applying said square wave also includes a transformer having an adjustable magnetic core interposed between said square wave generator and said transducer to vary the duty cycle of said square wave.
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) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |