Patent US4456836A successfully refreshed from Google Patents.
US4456836A
Expired / Lapsed
US
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Gate circuit for gate turn-off thyristor
Assignee: Hitachi Ltd
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Filing: 1981-12-29
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Granted: 1984-06-26
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Expires: 2001-12-29
Abstract
Abstract A gate circuit for gate turn-off thyristors is disclosed which includes a turn-on circuit formed of a series combination of a turn-on power source and an NPN transistor and a turn-off circuit formed of a series combination of a turn-off power source and a thyristor, and in which a PNP transistor is provided between the anode and gate of the thyristor in such a manner that the base of the NPN transistor and the base of the PNP transistor are connected to each other and a junction of these bases receives a control signal for turning on or off a gate turn-off thyristor.
Inventors
- 👤 Yasuo Matsuda
- 👤 Kazuo Honda
- 👤 Hiroshi Fukui
- 👤 Hisao Amano
- 👤 Shuji Musha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:00
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73; H03K17/732
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
139 words
A gate circuit provided with a turn-on circuit and a turn-off circuit each connected between gate and cathode terminals of a gate turn-off thyristor, said turn-on circuit including a series combination of a turn-on power source and a first NPN transistor, said turn-off circuit including a series combination of a turn-off power source and a thyristor, said gate circuit comprising: a signal input terminal connected to a base terminal of said first NPN transistor for supplying a control signal to said base terminal of said first NPN transistor; and a PNP transistor connected between anode and gate terminals of said thyristor, emitter and collector terminals of said PNP transistor being connected to said anode and gate terminals of said thyristor, respectively, a base terminal of said PNP transistor being connected to said base terminal of said first NPN transistor.
Claim 2
Dependent Claim
139 words
A gate circuit provided with a turn-on circuit and a turn-off circuit each connected between gate and cathode terminals of a gate turn-off thyristor, said turn-on circuit including a series combination of a turn-on power source and a first NPN transistor, said turn-off circuit including a series combination of a turn-off power source and a thyristor, said gate circuit comprising: a signal input terminal connected to a base terminal of said first NPN transistor for supplying a control signal to said base terminal of said first NPN transistor; and a PNP transistor connected between anode and gate terminals of said thyristor, emitter and collector terminals of said PNP transistor being connected to said anode and gate terminals of said thyristor, respectively, a base terminal of said PNP transistor being connected to said base terminal of said first NPN transistor.
Claim 3
Dependent Claim
37 words
A gate circuit according to claim 1, wherein said base terminal of said first NPN transistor is connected to said signal input terminal through a first zener diode whose forward direction is toward said signal input terminal.
Claim 4
Dependent Claim
53 words
A gate circuit according to claim 2, wherein a first diode is connected between a cathode terminal of said first zener diode and an anode terminal of said gate turn-off thyristor in such a manner that the forward direction of said first diode is toward said anode terminal of said gate turn-off thyristor.
Claim 5
Dependent Claim
35 words
A gate circuit according to claim 1, 2 or 3, wherein said gate turn-on circuit further comprises a second NPN transistor coupled to an emitter of said first NPN transistor to form a Darlington connection.
Claim 6
Dependent Claim
162 words
A gate circuit provided with a turn-on circuit and a turn-off circuit each connected between gate and cathode terminals of a gate turn-off thyristor, said turn-on circuit including a series combination of a turn-on power source and a first NPN transistor, said turn-off circuit including a series combination of a turn-off power source and a thyristor, said gate circuit comprising: a signal input terminal for supplying a control signal to a base terminal of said first NPN transistor; a first zener diode connected between said base terminal of said first NPN transistor and said signal input terminal, the forward direction of said first zener diode being toward said signal input terminal; and a PNP transistor connected between anode and gate terminals of said thyristor, emitter and collector terminals of said PNP transistor being connected to said anode and gate terminals of said thyristor, respectively, a base terminal of said PNP transistor being connected to a anode terminal of said first zener diode.
Claim 7
Dependent Claim
162 words
A gate circuit provided with a turn-on circuit and a turn-off circuit each connected between gate and cathode terminals of a gate turn-off thyristor, said turn-on circuit including a series combination of a turn-on power source and a first NPN transistor, said turn-off circuit including a series combination of a turn-off power source and a thyristor, said gate circuit comprising: a signal input terminal for supplying a control signal to a base terminal of said first NPN transistor; a first zener diode connected between said base terminal of said first NPN transistor and said signal input terminal, the forward direction of said first zener diode being toward said signal input terminal; and a PNP transistor connected between anode and gate terminals of said thyristor, emitter and collector terminals of said PNP transistor being connected to said anode and gate terminals of said thyristor, respectively, a base terminal of said PNP transistor being connected to a anode terminal of said first zener diode.
Claim 8
Dependent Claim
53 words
A gate circuit according to claim 5, wherein a first diode is connected between said cathode terminal of said first zener diode and said anode terminal of said gate turn-off thyristor in such a manner that the forward direction of said first diode is toward said anode terminal of said gate turn-off thyristor.
Claim 9
Dependent Claim
52 words
A gate circuit according to claim 5 or 6, wherein a second diode is connected between said gate terminal of said gate turn-off thyristor and a positive electrode terminal of said turn-on power source in such a manner that the forward direction of said second diode is toward said positive electrode terminal.
Claim 10
Dependent Claim
55 words
A gate circuit according to claim 5 or 6, wherein a second zener diode is connected between said cathode terminal of said first zener diode and said base terminal of said PNP transistor in such a manner that the forward direction of said second zener diode is toward said base terminal of said PNP transistor.
Claim 11
Dependent Claim
30 words
A gate circuit according to claim 8, wherein a resistor is connected between said base terminal of said PNP transistor and a positive electrode terminal of said turn-on power source.
Claim 12
Dependent Claim
24 words
A gate circuit according to claim 5 or 6, wherein a capacitor is connected between said base and emitter terminals of said PNP transistor.
Claim 13
Dependent Claim
29 words
A gate circuit according to claim 8, wherein a capacitor is connected between said emitter terminal of said PNP transistor and an anode terminal of said second zener diode.
Claim 14
Dependent Claim
34 words
A gate circuit according to claim 5 or 6, wherein said gate turn-on circuit further comprises a second NPN transistor coupled to an emitter of said first NPN transistor to form a Darlington connection.
Claim 15
Dependent Claim
69 words
A gate circuit according to claim 1, 2, 3, 5 or 6, wherein a resistor is connected between a positive electrode terminal of said turn-on power source and said signal input terminal, a switching element is connected between said signal input terminal and a negative electrode terminal of said turn-off power source, and said control signal is generated on the basis of an on-off action of said switching element.
Claim 16
Dependent Claim
124 words
A turn-on circuit connected between gate and cathode terminals of a gate turn-off thyristor and including a series combination of a turn-on power source and a first NPN transistor, said turn-on circuit comprising: a signal input terminal for supplying a control signal to a base terminal of said first NPN transistor; a first zener diode connected between said base terminal of said first NPN transistor and said signal input terminal, the forward direction of said first zener diode being toward said signal input terminal; and a first diode connected between a cathode terminal of said first zener diode and an anode terminal of said gate turn-off thyristor, the forward direction of said first diode being toward said anode terminal of said gate turn-off thyristor.
Claim 17
Dependent Claim
124 words
A turn-on circuit connected between gate and cathode terminals of a gate turn-off thyristor and including a series combination of a turn-on power source and a first NPN transistor, said turn-on circuit comprising: a signal input terminal for supplying a control signal to a base terminal of said first NPN transistor; a first zener diode connected between said base terminal of said first NPN transistor and said signal input terminal, the forward direction of said first zener diode being toward said signal input terminal; and a first diode connected between a cathode terminal of said first zener diode and an anode terminal of said gate turn-off thyristor, the forward direction of said first diode being toward said anode terminal of said gate turn-off thyristor.
Claim 18
Dependent Claim
27 words
A turn-on circuit according to claim 14, further comprising a second NPN transistor coupled to an emitter of said first NPN transistor to form a Darlington connection.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |