US3663838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically triggered thyristor
Assignee: Individual
•
Filing: 1970-10-16
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Granted: 1972-05-16
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Expires: 1990-10-16
Abstract
Abstract A thyristor circuit employing optical triggering of the thyristor and wherein the new circuit configuration thereof provides complete isolated gate triggering of the thyristor without implementation of direct or electromagnetic gate coupled triggering means.
Inventors
- 👤 Eberhart Reimers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:53
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/78; H03K17/79; H03K17/56; H03K17/72; H03K17/722; H03K17/723; H03K17/785; Y; Y10; Y10S; Y10S323/00; Y10S323/902
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
218 words
An optically triggered thyristor comprising in combination: a power supply; a load impedance; a thyristor having at least an anode terminal, a cathode terminal and a gate terminal, said thyristor having a primary controllable internal impedance defined by said anode and said cathode terminals and an input impedance defined by said gate and said cathode terminals, said thyristor having an ''''on'''' state and an ''''off'''' state; means electrically connecting said primary controllable internal impedance of said thyristor and said load impedance in series connection across said power supply; a capacitive voltage divider including at least first and second series connected capacitors; blocking diode means electrically connecting said capacitive voltage divider in parallel with said primary controllable internal impedance of said thyristor such that said power supply charges said first and second series connected capacitors when said thyristor is in its ''''off'''' state and said blocking diode means impedes discharge of said series connected capacitors when said thyristor is in its ''''on'''' stAte; light energization means; optically responsive switching means adapted to electrically connect said first capacitor across said input impedance of said thyristor such that the charge thereacross activates said thyristor to its ''''on'''' state such that said primary controllable internal impedance is conductive, said switching means being responsive to the light output of said light energization means.
Claim 2
Dependent Claim
218 words
An optically triggered thyristor comprising in combination: a power supply; a load impedance; a thyristor having at least an anode terminal, a cathode terminal and a gate terminal, said thyristor having a primary controllable internal impedance defined by said anode and said cathode terminals and an input impedance defined by said gate and said cathode terminals, said thyristor having an ''''on'''' state and an ''''off'''' state; means electrically connecting said primary controllable internal impedance of said thyristor and said load impedance in series connection across said power supply; a capacitive voltage divider including at least first and second series connected capacitors; blocking diode means electrically connecting said capacitive voltage divider in parallel with said primary controllable internal impedance of said thyristor such that said power supply charges said first and second series connected capacitors when said thyristor is in its ''''off'''' state and said blocking diode means impedes discharge of said series connected capacitors when said thyristor is in its ''''on'''' stAte; light energization means; optically responsive switching means adapted to electrically connect said first capacitor across said input impedance of said thyristor such that the charge thereacross activates said thyristor to its ''''on'''' state such that said primary controllable internal impedance is conductive, said switching means being responsive to the light output of said light energization means.
Claim 3
Dependent Claim
77 words
An optically triggered thyristor as defined in claim 1 wherein means are provided for producing a current flow of reverse direction in said primary controllable internal impedance of said thyristor and said blocking diode means includes current limiting high impedance bypass means in parallel therewith such that said capacitive voltage divider may be at least partially discharged by a lesser reverse current flow therethrough sufficient to permit subsequent recharge of said voltage divider by said power supply.
Claim 4
Dependent Claim
39 words
An optically triggered thyristor as defined in claim 2 wherein said optically responsive switching means includes a transistor interconnection and a photo-responsive on-off means adapted to bias said transistor to a conductive state in accordance with light energization thereof.
Claim 5
Dependent Claim
46 words
An optically triggered thyristor as defined in claim 3 wherein said photo-responsive on-off means is of the field effect transistor variety and is operative to apply the voltage across said first capacitor as the gate voltage to said transistor interconnection in accordance with light energization thereof.
Claim 6
Dependent Claim
19 words
An optically triggered thyristor as defined in claim 1 wherein said power supply is of the alternating current variety.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |