Patent US4857762A successfully refreshed from Google Patents.
US4857762A
Expired / Lapsed
US
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Digital 2-of-3 selection and output circuit
Assignee: Siemens AG
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Filing: 1987-10-28
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Granted: 1989-08-15
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Expires: 2007-10-28
Abstract
Abstract For the operation of a technical system having increased safety requirements, all of the apparatus for increasing the safety and the availbility are provided in triple redundancy. As selection and output circuit, three redundant data channels (DE1, DE2, DE3) normally emitting the same information are respectively connected in pairs to three AND elements, each consisting of two optocouplers (OR1/OR4, OR2/OR5, OR3/OR6). The elements of the optocouplers are connected with a relay (RL) by an OR arrangement (WO).
Inventors
- 👤 Lutz Gaebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:24
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/20; H03K19/23; H03K19/02; H03K19/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
139 words
A digital 2-of-3 selection and output circuit comprising, in combination: three AND elements (AND1, AND2, AND3,) each consisting of parts of two optocouplers (OR1/OR5, OR2/OR6, OR3/OR4), each optocoupler (OR1) comprising a light transmitter (LS1) and a light receiver (LE1), two light transmitters (LS1/LS4, LS2/LS5, LS3/LS6) of two optocouplers (OR1/OR4, OR2/OR5, OR3/OR6) of different AND elements (AND1/AND3, AND2/AND1, AND3/AND2) are connected in series to one of three data channels (DE1, DE2, DE3), to be fed with an electrical signal at level "1" and the light receivers (LE1/LE5, LE2/LE6, LE3/LE4) of first said two optocouplers (OR1/OR5, OR2/OR6), OR3/OR5) allocated with their light transmitters (LS1/LS5, LS2/LS6, LS3/LS4) to different data channels (DE1/DE2, DE2/DE3, DE3/DE1) being connected in series to form the output of the AND element, and an OR arrangement having three inputs connected to the outputs of said three AND elements.
Claim 2
Dependent Claim
139 words
A digital 2-of-3 selection and output circuit comprising, in combination: three AND elements (AND1, AND2, AND3,) each consisting of parts of two optocouplers (OR1/OR5, OR2/OR6, OR3/OR4), each optocoupler (OR1) comprising a light transmitter (LS1) and a light receiver (LE1), two light transmitters (LS1/LS4, LS2/LS5, LS3/LS6) of two optocouplers (OR1/OR4, OR2/OR5, OR3/OR6) of different AND elements (AND1/AND3, AND2/AND1, AND3/AND2) are connected in series to one of three data channels (DE1, DE2, DE3), to be fed with an electrical signal at level "1" and the light receivers (LE1/LE5, LE2/LE6, LE3/LE4) of first said two optocouplers (OR1/OR5, OR2/OR6), OR3/OR5) allocated with their light transmitters (LS1/LS5, LS2/LS6, LS3/LS4) to different data channels (DE1/DE2, DE2/DE3, DE3/DE1) being connected in series to form the output of the AND element, and an OR arrangement having three inputs connected to the outputs of said three AND elements.
Claim 3
Dependent Claim
51 words
A digital 2-of-3 selection and output circuit according to claim 1, wherein said three series circuits formed of light receivers (LE1/LE5, LE2/LE6, LE3/LE4) are connected in a "wired OR" (WO) circuit, and including an output relay (RL), the control input of said relay (RL) being connected to said "wired OR" circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |