US4417156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gate circuit for thyristors
Assignee: Hitachi Ltd
•
Filing: 1981-02-26
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Granted: 1983-11-22
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Expires: 2001-02-26
Abstract
Abstract A gate circuit for a thyristor is disclosed which includes a power supply for feeding gate-on current through a gate and cathode of the thyristor, a switching circuit connected in series with the power supply to turn the gate-on current on or off, and a diode connected between a gate ignition signal input terminal of said switching circuit and the anode of said thyristor with the cathode of said diode being coupled to said anode of said thyristor and the anode of said diode coupled to said switching circuit.
Inventors
- 👤 Hiroshi Fukui
- 👤 Shin Kimura
- 👤 Kenichi Onda
- 👤 Hisao Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:54
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73; H02; H02M; H02M1/00; H02M1/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
A gate circuit for a thyristor comprising a power supply for feeding gate-on current through a gate and cathode of said thyristor, a switching circuit connected in series with the power supply to turn the gate-on current on or off, a diode connected between a gate ignition signal input terminal of said switching circuit and the anode of said thyristor with the cathode of said diode coupled to said anode of said thyristor and the anode of said diode coupled to said switching circuit.
Claim 2
Dependent Claim
84 words
A gate circuit for a thyristor comprising a power supply for feeding gate-on current through a gate and cathode of said thyristor, a switching circuit connected in series with the power supply to turn the gate-on current on or off, a diode connected between a gate ignition signal input terminal of said switching circuit and the anode of said thyristor with the cathode of said diode coupled to said anode of said thyristor and the anode of said diode coupled to said switching circuit.
Claim 3
Dependent Claim
46 words
A gate circuit according to claim 1, wherein said switching circuit is a transistor having an emitter coupled to said gate of said thyristor, a collector coupled to a positive terminal of said power supply and a base coupled to said gate ignition signal input terminal.
Claim 4
Dependent Claim
62 words
A gate circuit according to claim 2, further comprising a second switching circuit coupled between the cathode of said thyristor and said gate ignition signal input terminal, said second switching circuit being turned on or off by the gate ignition signal, and there being a resistor connected between the positive terminal of said power supply and said gate ignition signal input terminal.
Claim 5
Dependent Claim
40 words
A gate circuit according to claim 2, further comprising a series circuit in which a second switching element is connected in series with a resistor between the positive terminal of said power supply and said gate ignition signal input terminal.
Claim 6
Dependent Claim
16 words
A gate circuit according to claim 4 in which said thyristor is a gate turn-off thyristor.
Claim 7
Dependent Claim
16 words
A gate circuit according to claim 3 in which said thyristor is a gate turn-off thyristor.
References Cited (Backward Citations)
US3728557A
Cited
US3793537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |