US5394048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-voltage generator
Assignee: Toshiba Corp
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Filing: 1993-07-23
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Granted: 1995-02-28
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Expires: 2013-07-23
Abstract
Abstract A high-voltage generator employing a piezoelectric transformer has an inverter having input and output terminals connected to input terminals of the piezoelectric transformer, respectively; a feedback resistor connected to the input terminals of the piezoelectric transformer in parallel with the inverter; and first and second capacitors. The first capacitor is connected between the input terminal of the inverter and a ground. The second capacitor is connected between the output terminal of the inverter and the ground. The inverter, feedback resistor, and capacitors form a self-exciting oscillator to drive the piezoelectric transformer so that the piezoelectric transformer produces a high-voltage output. Since the inverter, feedback resistor, and capacitors are small, thin and light, the high-voltage generator as a whole is also small, thin and light.
Inventors
- 👤 Tetsuji Yamashita
- 👤 Hitoshi Kawabata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:27
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/802; H10N30/804; H10N30/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
103 words
A high-voltage generator employing a piezoelectric transformer, comprising: a CMOS-IC inverter having input and output terminals connected to input terminals of the piezoelectric transformer, respectively; a feedback resistor connected to the input terminals of the piezoelectric transformer in parallel with said CMOS-IC inverter; first and second capacitors, said first capacitor being connected between the input terminal of said inverter and a ground, said second capacitor being connected between the output terminal of said inverter and the ground; and a power source connected to said CMOS-IC inverter, so that said CMOS-IC inverter, feedback resistor, and first and second capacitors form a self oscillation circuit.
Claim 2
Dependent Claim
103 words
A high-voltage generator employing a piezoelectric transformer, comprising: a CMOS-IC inverter having input and output terminals connected to input terminals of the piezoelectric transformer, respectively; a feedback resistor connected to the input terminals of the piezoelectric transformer in parallel with said CMOS-IC inverter; first and second capacitors, said first capacitor being connected between the input terminal of said inverter and a ground, said second capacitor being connected between the output terminal of said inverter and the ground; and a power source connected to said CMOS-IC inverter, so that said CMOS-IC inverter, feedback resistor, and first and second capacitors form a self oscillation circuit.
Claim 3
Dependent Claim
19 words
The high voltage generator according to claim 1, wherein the piezoelectric transformer has an output connected to a rectifier.
Claim 4
Dependent Claim
32 words
The high-voltage generator according to claim 1, further comprising: a damping resistor connected between the output terminal of said inverter and a corresponding one of the input terminals of the piezoelectric transformer.
Claim 5
Dependent Claim
80 words
A high-voltage generator employing a piezoelectric transformer, comprising: a NAND gate having input and output terminals connected to input terminals of the piezoelectric transformer, respectively; a feedback resistor connected to the input terminals of the piezoelectric transformer in parallel with said NAND gate; and first and second capacitors, the first capacitor being connected between the input terminal of said NAND gate and a ground, the second capacitor being connected between the output terminal of said NAND gate and the ground.
Claim 6
Dependent Claim
80 words
A high-voltage generator employing a piezoelectric transformer, comprising: a NAND gate having input and output terminals connected to input terminals of the piezoelectric transformer, respectively; a feedback resistor connected to the input terminals of the piezoelectric transformer in parallel with said NAND gate; and first and second capacitors, the first capacitor being connected between the input terminal of said NAND gate and a ground, the second capacitor being connected between the output terminal of said NAND gate and the ground.
Claim 7
Dependent Claim
80 words
A high-voltage generator employing a piezoelectric transformer, comprising: a NOR gate having input and output terminals connected to input terminals of the piezoelectric transformer, respectively; a feedback resistor connected to the input terminals of the piezoelectric transformer in parallel with said NOR gate; and first and second capacitors, the first capacitor being connected between the input terminal of said NOR gate and a ground, the second capacitor being connected between the output terminal of said NOR gate and the ground.
Claim 8
Dependent Claim
80 words
A high-voltage generator employing a piezoelectric transformer, comprising: a NOR gate having input and output terminals connected to input terminals of the piezoelectric transformer, respectively; a feedback resistor connected to the input terminals of the piezoelectric transformer in parallel with said NOR gate; and first and second capacitors, the first capacitor being connected between the input terminal of said NOR gate and a ground, the second capacitor being connected between the output terminal of said NOR gate and the ground.
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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) | 1998-02-27 | 1998-08-29 | 1999-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-27 | 2002-08-29 | 2003-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-27 | 2006-08-29 | 2007-02-28 | $7700.00 | Window Closed / Lapsed |