US3609415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric transformer circuits
Assignee: Denki Onkyo Co Ltd
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Filing: 1970-07-13
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Granted: 1971-09-28
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Expires: 1990-07-13
Abstract
Abstract In a piezoelectric transformer circuit wherein a high voltage is produced at the output electrode of the piezoelectric transformer by applying a driving voltage of a frequency equal or close to the resonance frequency of the piezoelectric transformer across the driving electrodes thereof, a DC voltage is impressed upon the driving electrode to vary the resonance frequency to regulate the output voltage characteristics.
Inventors
- 👤 Takehiko Kawada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:03
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/802; H10N30/804
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
The piezoelectric transformer circuit according to claim 1 wherein said DC supply means comprises a source of variable voltage.
Claim 2
Dependent Claim
23 words
The piezoelectric transformer circuit according to claim 1 wherein said rectifier circuit steps up the voltage by a factor of an even integer.
Claim 3
Dependent Claim
49 words
The piezoelectric transformer according to claim 1 which further comprises a DC blocking capacitor connected between said source of driving voltage and one of said driving electrodes and a AC bypass capacitor connected between the output terminal of said DC supply means and the other of said driving electrodes.
Claim 4
Dependent Claim
162 words
A piezoelectric transformer circuit comprising a piezoelectric transformer including a pair of driving electrodes and a high-voltage output electrode, a source of a predetermined frequency for applying a driving voltage across said driving electrodes, a rectifier circuit connected to said output electrode, a load circuit energized by said rectifier circuit, a nonlinear element having one electrode connected to the juncture between said rectifier circuit and said load circuit, an impedance element connected to the other electrode of said nonlinear element, and DC voltage applying means connected between one of said driving electrodes and the juncture between said nonlinear element and said impedance element, said nonlinear element bypassing a portion of the output from said rectifier circuit when the output voltage thereof exceeds a predetermined value characteristic to said nonlinear element to create a voltage drop across said impedance elemenT which is supplied to said one driving electrode through said DC voltage supplying means to regulate the output voltage of said piezoelectric transformer.
Claim 5
Dependent Claim
31 words
The piezoelectric transformer circuit according to claim 5 wherein said nonlinear element comprises a symmetrical or asymmetrical varistor and said impedance element and said DC voltage applying means are resistors, respectively.
Claim 6
Dependent Claim
19 words
The piezoelectric transformer circuit according to claim 5 wherein an AC bypass capacitor is connected across said impedance element.
Claim 7
Dependent Claim
21 words
The piezoelectric transformer according to claim 5 wherein said load circuit is comprised by the anode load of a cathode-ray tube.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |