Patent US4998925A successfully refreshed from Google Patents.
US3676685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-responsive switching circuit
Assignee: XERCON Inc
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Filing: 1970-05-04
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Granted: 1972-07-11
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Expires: 1990-05-04
Abstract
Abstract A modularized light-responsive switching circuit capable of use in relatively high power applications. The circuit includes a Triac connected as a switching element in series with a power source and a load. The gate electrode of the Triac is connected to a light-responsive gating circuit including a capacitor and at least one light-responsive resistor switchable between two resistance levels. The capacitor is charged when the lightresponsive resistor assumes one resistance level and is discharged into the gate of the Triac when the light-dependent resistor assumes the other resistance level. The components of the switching circuit are encapsulated in a cylindrical module having a screen therein, through which the active surface of the light-responsive resistor can receive light, and having a pair of terminals to connect the module directly into a power circuit.
Inventors
- 👤 Clifford E Myer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:54
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/965; H03K17/968; Y; Y10; Y10S; Y10S323/00; Y10S323/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
An electrIcal switching circuit comprising a bidirectional switching device having a gate and a pair of anodes adapted to be connected in closed electrical circuit with an AC power source and a load, and gating circuit means for said device including a bidirectional avalanche diode having one side connected to said gate, a capacitor and a first light-responsive element connected in series between the other side of said diode and one of said anodes, and a second light-responsive element connected between said other side of said diode and the other anode.
Claim 2
Dependent Claim
91 words
An electrIcal switching circuit comprising a bidirectional switching device having a gate and a pair of anodes adapted to be connected in closed electrical circuit with an AC power source and a load, and gating circuit means for said device including a bidirectional avalanche diode having one side connected to said gate, a capacitor and a first light-responsive element connected in series between the other side of said diode and one of said anodes, and a second light-responsive element connected between said other side of said diode and the other anode.
Claim 3
Dependent Claim
14 words
The circuit of claim 1, wherein said capacitor is connected between said light-responsive elements.
Claim 4
Dependent Claim
158 words
An electrical switching circuit adapted to be connected in series with an AC power source and a load for supplying and blocking the flow of such power to the load comprising a pair of terminals with one adapted to be connected directly to one side of a load and the other adapted to be connected directly to one side of a source, a bidirectional switching device having a gate and a pair of anodes, each of said anodes being connected directly to a different one of said terminals, a capacitor directly interconnecting said terminals and in parallel with said device, and gating circuit means for said device including a bidirectional avalanche diode having one side connected directly to said gate, a capacitor different from said first-mentioned capacitor directly interconnecting the other side of said diode and one of said anodes, and at least one light-responsive element directly interconnecting said other side of said diode and the other anode.
Claim 5
Dependent Claim
158 words
An electrical switching circuit adapted to be connected in series with an AC power source and a load for supplying and blocking the flow of such power to the load comprising a pair of terminals with one adapted to be connected directly to one side of a load and the other adapted to be connected directly to one side of a source, a bidirectional switching device having a gate and a pair of anodes, each of said anodes being connected directly to a different one of said terminals, a capacitor directly interconnecting said terminals and in parallel with said device, and gating circuit means for said device including a bidirectional avalanche diode having one side connected directly to said gate, a capacitor different from said first-mentioned capacitor directly interconnecting the other side of said diode and one of said anodes, and at least one light-responsive element directly interconnecting said other side of said diode and the other anode.
Claim 6
Dependent Claim
23 words
The circuit of claim 3, wherein said one anode is the anode adapted to be connected to said one side of said load.
Claim 7
Dependent Claim
12 words
The circuit of claim 4, wherein said switching device comprises a Triac.
Claim 8
Dependent Claim
23 words
The circuit of claim 3, wherein said one anode is the anode adapted to be connected to said one side of said source.
Claim 9
Dependent Claim
12 words
The circuit of claim 6, wherein said switching device comprises a Triac.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |