US3778648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric transformers
Assignee: Denki Onkyo Co Ltd
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Filing: 1972-06-28
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Granted: 1973-12-11
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Expires: 1992-06-28
Abstract
Abstract In a driving circuit for driving a piezoelectric transformer including a piezoelectric member provided with a pair of driving electrodes and an output electrode, there are provided a transformer having primary and secondary windings and a transistor. The collector electrode of the transistor is connected to one pole of a DC source through the primary winding, and the secondary winding and the driving electrodes are connected in series across the base and emitter electrodes thereby forming an oscillation circuit for producing a high frequency driving voltage.
Inventors
- 👤 T Kawada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:27
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3381; H03; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1231; H03B5/1296; H10; H10N; H10N30/00; H10N30/80; H10N30/802; H10N30/804; H03B5/30; H03B5/32; H03B5/36; H03B5/362
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
A piezoelectric transformer comprising a piezoelectric member having a pair of driving electrodes at one end and an output electrode at the opposite end of said piezoelectric member, a transistor having a base electrode, a collector electrode and an emitter electrode, a transformer having a primary winding and a secondary winding, means to connect said collector electrode to one pole of a DC source through said primary winding and means to connect in series said secondary winding and said driving electrodes across the base and emitter electrodes of said transistor, thereby forming an oscillatioN circuit for producing a high voltage driving voltage, and including a phase adjuster having a variable resistor connected between one of the driving electrodes and said base electrode and a capacitor connected between said one driving electrode and said emitter electrode.
Claim 2
Dependent Claim
135 words
A piezoelectric transformer comprising a piezoelectric member having a pair of driving electrodes at one end and an output electrode at the opposite end of said piezoelectric member, a transistor having a base electrode, a collector electrode and an emitter electrode, a transformer having a primary winding and a secondary winding, means to connect said collector electrode to one pole of a DC source through said primary winding and means to connect in series said secondary winding and said driving electrodes across the base and emitter electrodes of said transistor, thereby forming an oscillatioN circuit for producing a high voltage driving voltage, and including a phase adjuster having a variable resistor connected between one of the driving electrodes and said base electrode and a capacitor connected between said one driving electrode and said emitter electrode.
Claim 3
Dependent Claim
20 words
The piezoelectric transformer according to claim 1 wherein the other pole of said DC source is grounded through a capacitor.
Claim 4
Dependent Claim
18 words
The piezoelectric transformer according to claim 2 wherein a shunt resistor is connected in parallel with said capacitor.
Claim 5
Dependent Claim
23 words
Apparatus according to claim 1 and including a diode connected between said collector and emitter electrodes and poled to protect said collector electrode.
Claim 6
Dependent Claim
23 words
Apparatus according to claim 4 and including a diode connected between said base and emitter electrodes and poled to protect said emitter electrode.
Claim 7
Dependent Claim
38 words
Apparatus according to claim 1 and including a resistor voltage divider connected across said DC source with an intermediate point on said voltage divider connected to said base electrode for biasing the collector base and emitter base junctions.
Claim 8
Dependent Claim
20 words
Apparatus according to claim 1 in which said transistor is connected as a grounded base amplifier in said oscillation circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |