US3767940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage compensated firing circuit
Assignee: General Electric Co
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Filing: 1972-04-24
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Granted: 1973-10-23
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Expires: 1992-04-24
Abstract
Abstract A firing circuit for firing a number of controlled rectifiers in which there are a number of slave controlled rectifiers, each of which is associated with a storage capacitor for firing the slave controlled rectifier upon discharge of the storage capacitors. A master controlled rectifier is connected in circuit with the storage capacitors for discharging the storage capacitors to fire the slave controlled rectifiers upon firing of the master controlled rectifier. There is a timing circuit including a programmable unijunction transistor which conducts when its anode voltage exceeds its gate voltage by more than its junction voltage drop. The gate of the programmable unijunction transistor has a selectively variable connection to a voltage divider circuit, which, in turn, is connected in circuit across the pulsating potential source. A first Zener diode is connected in circuit across the pulsating potential source and a resistancecapacitance circuit is connected across the Zener diode. The anode of the programmable unijunction transistor is connected to the charging circuit. The gate of the master controlled rectifier is connected to the cathode of the programmable unijunction transistor for firing the master controlled rectifier, and thus the slave controlled rectifiers, upon conduction of the unijunction transistor. The voltage divider circuit, in one form includes a second Zener diode, having a lower regulating voltage than the first Zener diode, for providing a regulated voltage to the programmable unijunction gate. In another version, the voltage divider circuit is connected to the first Zener diode through a dropping resistance for providing the gate of the programmable unijunction transistor with a regulated voltage.
Inventors
- 👤 R Herzog
- 👤 F Neusbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:22
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
193 words
A voltage compensated circuit for operating at least one solid state switch means from a cyclically varying potential source, including: a. at least one solid state switch means having a control terminal; b. a first voltage regulating device connected in circuit across the potential source so that a regulated D.C. potential appears across said first voltage regulating device; c. a resistance-capacitance charging circuit connected across said first voltage regulating device; d. a programmable unijunction transistor having an anode terminal, a cathode terminal and a gate terminal; said anode terminal being connected to said charging circuit for providing said programmable unijunction with anode voltage; e. a voltage divider circuit connected to the potential source; said programmable unijunction gate terminal having a selectively variable connection to said voltage divider circuit for controlling the gate voltage of said programmable unijunction; f. means for providing said programmable unijunction gate terminal with a regulated voltage; g. said control terminal of said at least one solid state switch means being connected in circuit with said programmable unijunction cathode terminal for providing a control signal to said at least one solid state switch means upon conduction of said programmable unijunction.
Claim 2
Dependent Claim
193 words
A voltage compensated circuit for operating at least one solid state switch means from a cyclically varying potential source, including: a. at least one solid state switch means having a control terminal; b. a first voltage regulating device connected in circuit across the potential source so that a regulated D.C. potential appears across said first voltage regulating device; c. a resistance-capacitance charging circuit connected across said first voltage regulating device; d. a programmable unijunction transistor having an anode terminal, a cathode terminal and a gate terminal; said anode terminal being connected to said charging circuit for providing said programmable unijunction with anode voltage; e. a voltage divider circuit connected to the potential source; said programmable unijunction gate terminal having a selectively variable connection to said voltage divider circuit for controlling the gate voltage of said programmable unijunction; f. means for providing said programmable unijunction gate terminal with a regulated voltage; g. said control terminal of said at least one solid state switch means being connected in circuit with said programmable unijunction cathode terminal for providing a control signal to said at least one solid state switch means upon conduction of said programmable unijunction.
Claim 3
Dependent Claim
52 words
A voltage compensated circuit as set forth in claim 1, wherein said first voltage regulating device is connected across the potential source in series with a first dropping resistance; said first dropping resistance having an intermediate tap; and said voltage divider circuit is connected to the potential source through said intermediate tap.
Claim 4
Dependent Claim
28 words
A voltage compensated circuit as set forth in claim 1, wherein said voltage divider circuit is connected to the potential source independently of said first voltage regulating device.
Claim 5
Dependent Claim
39 words
A voltage compensated circuit as set forth in claim 1, wherein said voltage divider circuit is connected to said first voltage regulating device through a second dropping resistance for providing said programmable unijunction gate terminal with a regulated voltage.
Claim 6
Dependent Claim
49 words
A voltage compensated circuit as set forth in claim 1 wherEin said voltage divider circuit includes a second voltage regulating device having a lower regulating voltage than that of said first voltage regulating device, said second voltage regulating device providing said programmable unijunction gate terminal with a regulated voltage.
Claim 7
Dependent Claim
184 words
A voltage compensated circuit for firing at least one thyristor, comprising: a. at least one thyristor having a control terminal; b. input means for providing a pulsating D.C. potential; c. a first Zener diode connected in circuit across said input means in circuit with a first dropping resistance having an intermediate tap so that a regulated D.C. potential appears across said first Zener diode; d. a resistance-capacitance charging circuit connected across said first Zener diode; e. a programmable unijunction transistor having an anode terminal, a gate terminal and a cathode terminal; said anode terminal being connected to said charging circuit for providing said programmable unijunction with anode voltage; f. a voltage divider circuit connected across said input means through said intermediate tap of said first dropping resistance; said gate terminal of said programmable unijunction having a selectively variable connection to said voltage divider circuit for controlling the gate voltage of said programmable unijunction; g. said control terminal of said thyristor being connected in circuit with said programmable unijunction cathode terminal for providing a firing signal to said thyristor upon conduction of said programmable unijunction.
Claim 8
Dependent Claim
184 words
A voltage compensated circuit for firing at least one thyristor, comprising: a. at least one thyristor having a control terminal; b. input means for providing a pulsating D.C. potential; c. a first Zener diode connected in circuit across said input means in circuit with a first dropping resistance having an intermediate tap so that a regulated D.C. potential appears across said first Zener diode; d. a resistance-capacitance charging circuit connected across said first Zener diode; e. a programmable unijunction transistor having an anode terminal, a gate terminal and a cathode terminal; said anode terminal being connected to said charging circuit for providing said programmable unijunction with anode voltage; f. a voltage divider circuit connected across said input means through said intermediate tap of said first dropping resistance; said gate terminal of said programmable unijunction having a selectively variable connection to said voltage divider circuit for controlling the gate voltage of said programmable unijunction; g. said control terminal of said thyristor being connected in circuit with said programmable unijunction cathode terminal for providing a firing signal to said thyristor upon conduction of said programmable unijunction.
Claim 9
Dependent Claim
24 words
A voltage compensated circuit as set forth in claim 6, further comprising means for providing said programmable unijunction gate terminal with a regulated voltage.
Claim 10
Dependent Claim
48 words
A voltage compensated circuit as set forth in claim 6 wherein said voltage divider circuit is connected to said first Zener diode through a second dropping resistance for providing said programmable unijunction gate terminal with a regulated voltage less than the regulating voltage of said first Zener diode.
Claim 11
Dependent Claim
46 words
A voltage compensated circuit as set forth in claim 6 wherein said voltage divider circuit includes a second Zener diode having a lower regulating voltage than that of said first Zener diode, said second Zener diode providing said programmable unijunction gate terminal with a regulated voltage.
Claim 12
Dependent Claim
276 words
A voltage compensated firing circuit for firing a plurality of thyristors, said firing circuit comprising: a. input means for providing a pulsating potential; b. a master thyristor and a plurality of slave thyristors; c. a plurality of auxiliary firing circuits; each of said auxiliary firing circuits including said at least one slave thyristor and at least one storage capacitor, means coupling each of said storage capacitors to its associated at least one slave thyristor for firing said at least one slave thyristor when said storage capacitor is discharged, and circuit means connecting each of said storage capacitors to said input means to provide each of said storage capacitors with a charge and connecting each of said storage capacitors in circuit across said master thyristor to provide a discharge path for each of said storage capacitors upon firing of said master thyristor. d. a programmable unijunction transistor; said programmable unijunction having an anode terminal, a cathode terminal and a gate terminal; e. a voltage divider circuit connected to said input means; said programmable unijunction gate terminal having a selectively variable connection to said voltage divider circuit for controlling the gate voltage of said programmable unijunction; f. a first voltage regulating device connected across said input means for providing a regulated D.C. voltage across said first voltage regulating device; g. a resistance-capacitance charging circuit connected across said first voltage regulating device, said programmable unijunction anode terminal being connected to said charging circuIt for providing said programmable unijunction with anode voltage; h. said master thyristor having a control terminal connected in circuit with said programmable unijunction cathode terminal for firing said master thyristor upon conduction of said programmable unijunction.
Claim 13
Dependent Claim
276 words
A voltage compensated firing circuit for firing a plurality of thyristors, said firing circuit comprising: a. input means for providing a pulsating potential; b. a master thyristor and a plurality of slave thyristors; c. a plurality of auxiliary firing circuits; each of said auxiliary firing circuits including said at least one slave thyristor and at least one storage capacitor, means coupling each of said storage capacitors to its associated at least one slave thyristor for firing said at least one slave thyristor when said storage capacitor is discharged, and circuit means connecting each of said storage capacitors to said input means to provide each of said storage capacitors with a charge and connecting each of said storage capacitors in circuit across said master thyristor to provide a discharge path for each of said storage capacitors upon firing of said master thyristor. d. a programmable unijunction transistor; said programmable unijunction having an anode terminal, a cathode terminal and a gate terminal; e. a voltage divider circuit connected to said input means; said programmable unijunction gate terminal having a selectively variable connection to said voltage divider circuit for controlling the gate voltage of said programmable unijunction; f. a first voltage regulating device connected across said input means for providing a regulated D.C. voltage across said first voltage regulating device; g. a resistance-capacitance charging circuit connected across said first voltage regulating device, said programmable unijunction anode terminal being connected to said charging circuIt for providing said programmable unijunction with anode voltage; h. said master thyristor having a control terminal connected in circuit with said programmable unijunction cathode terminal for firing said master thyristor upon conduction of said programmable unijunction.
Claim 14
Dependent Claim
53 words
A voltage compensated firing circuit as set forth in claim 10, wherein said first voltage regulating device is connected across said input means in series with a first dropping resistance, said first dropping resistance having an intermediate tap, and said voltage divider circuit is connected to said input means through said intermediate tap.
Claim 15
Dependent Claim
50 words
A voltage compensated circuit as set forth in claim 11, wherein said voltage divider circuit is connected to said first voltage regulating device through a second dropping resistance for providing said programmable unijunction gate terminal with a regulated voltage less than the regulating voltage of said first voltage regulating device.
Claim 16
Dependent Claim
49 words
A voltage compensated circuit as set forth in claim 12, wherein said voltage divider circuit includes a second voltage regulating device having a lower regulating voltage than that of said first voltage regulating device; said second voltage regulating device providing said programmable unijunction gate terminal with a regulated voltage.
Claim 17
Dependent Claim
28 words
A voltage compensated circuit as set forth in claim 12, wherein said voltage divider circuit is connected to said input means independent of said first voltage regulating device.
References Cited (Backward Citations)
US3633047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |