US4298809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate circuit for gate turn-off thyristor
Assignee: Hitachi Ltd
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Filing: 1979-09-24
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Granted: 1981-11-03
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Expires: 1999-09-24
Abstract
Abstract A gate circuit for use with a gate turn-off thyristor comprises a capacitor to be charged by a power source supplying a gate turn-on current. The capacitor is connected in series with a power source supplying a gate turn-off current.
Inventors
- 👤 Kenichi Onda
- 👤 Hisao Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:22
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
A gate circuit for a GTO thyristor comprising: a first series connection of a first DC power source and a first switching element connected between the gate and cathode electrodes of said GTO thyristor for supplying a gate turn-on current to said GTO thyristor; a capacitor being charged by said first series connection; and a second series connection of a second DC power source and a second switching element connected in series with said capacitor between the gate and cathode electrodes of said GTO thyristor for supplying a gate turn-off current to said GTO thyristor.
Claim 2
Dependent Claim
95 words
A gate circuit for a GTO thyristor comprising: a first series connection of a first DC power source and a first switching element connected between the gate and cathode electrodes of said GTO thyristor for supplying a gate turn-on current to said GTO thyristor; a capacitor being charged by said first series connection; and a second series connection of a second DC power source and a second switching element connected in series with said capacitor between the gate and cathode electrodes of said GTO thyristor for supplying a gate turn-off current to said GTO thyristor.
Claim 3
Dependent Claim
118 words
A gate circuit for a GTO thryistor comprising: a first series connection of a first DC power source and a first switching element connected in series with a first resistor between the gate and cathode electrodes of said GTO thyristor for supplying a gate turn-on current to said GTO thyristor; a second series connection of a second resistor and a capacitor connected in parallel with said first resistor; a diode connected in parallel with said capacitor; and a third series connection of a second DC power source and a second switching element connected in series with said capacitor between the gate and cathode electrodes of said GTO thyristor for supplying a gate turn-off current to said GTO thyristor.
Claim 4
Dependent Claim
118 words
A gate circuit for a GTO thryistor comprising: a first series connection of a first DC power source and a first switching element connected in series with a first resistor between the gate and cathode electrodes of said GTO thyristor for supplying a gate turn-on current to said GTO thyristor; a second series connection of a second resistor and a capacitor connected in parallel with said first resistor; a diode connected in parallel with said capacitor; and a third series connection of a second DC power source and a second switching element connected in series with said capacitor between the gate and cathode electrodes of said GTO thyristor for supplying a gate turn-off current to said GTO thyristor.
Claim 5
Dependent Claim
21 words
A gate circuit according to claim 1 or 2, wherein each of said first and second switching elements is a transistor.
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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |