GB1335710A - Voter circuits for triple redundant systems - Google Patents
Voter circuits for triple redundant systemsInfo
- Publication number
- GB1335710A GB1335710A GB1335710DA GB1335710A GB 1335710 A GB1335710 A GB 1335710A GB 1335710D A GB1335710D A GB 1335710DA GB 1335710 A GB1335710 A GB 1335710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- channel
- channels
- failure
- outputs
- amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0079—Receiver details
- H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Safety Devices In Control Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Amplifiers (AREA)
Abstract
1335710 Digital transmission ELLIOT BROS (LONDON) Ltd 15 Sept 1971 [15 Sept 1970] 44082/70 Heading H4P A three circuit redundancy system maintains separate outputs equal at a value which is a function of three input signals. Normal differences between channels do not simulate an error. The system includes transient suppression by means of a fader so that outputs of sync. circuitry do not exhibit step changes, hence larger disparities between inputs can be accommodated. In one embodiment a channel 2 is chosen as a reference and channels 1, 3 are synchronized to it hence failure of channels 1 or 3 have no effect on the output. On failure of channel 2 channel 3 is chosen as a reference, all other outputs being compared with this. Transients can arise from switching from channel 2 to 3 hence, on failure, a fader fed from these channels is switched temporarily to inject a signal into the sync. circuit, equal to and opposite the difference between channels 2, 3 which decays to zero. Signals in channel 2, before, and channel 3, after, changeover do not themselves pass through the fader. The fader circuit may be triplicated. The monitoring circuit consists of a first part for error detection, e.g. amplitude comparison, each fed for a pair of channels, which produce a signal when inputs differ by more than a determined amount. Outputs are combined in a logic circuit producing three error outputs 17, an output 18 indicating single channel failure, and 19 two channel failure. The second part is essentially a switching arrangement which connects three inputs to sync. circuit outputs. In normal operation the switches are in the position shown and all outputs are driven from respective inputs. Any difference between channels 1, 2 is detected by amplifier Al which has limited authority so that a failure does not cause disruption of more than one output. This amplifier also feeds amplifier 13 which as is responsive to the difference between channel 1 and channel 1 minus channel 2 its output is equal to the channel 2 input. Similarly amplifier 15 follows the channel 2 input. In the event of failure of channels 1 or 3, one of lines 17 will be energized hence changing the position of switch S1 resulting in amplifier 13 being driven from channel 2, or S3 resulting in channel 1 driving amplifiers 13, 15 and the difference between channels 1, 2 being subtracted from both. Either of these failures leaves output signals substantially unchanged. In the event of failure of channel 2 switches S2A, S2B, S2C are reversed hence channel 3 drives three outputs instead of channel 2. Additionally switches S2D, S2E changeover in fader circuit 20 which previously had been receiving an input from channels 2, 3 thus an amplifier A3 forms the difference between these channels which is stored in an integrator Il. On failure switch S2D opens and S2E is closed thus supplying the stored quantity to amplifiers 13-15 with the previous difference between the channel 2, 3 signals. The signal on the integrator will gradually decay to channel 3 level with time. In another arrangement, the average of inputs to channels 1, 3 is chosen as a reference value thus failure of channel 2 has no effect. On failure of channel 1 or 3 channel 2 is employed as a primary channel.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4408270 | 1970-09-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1335710A true GB1335710A (en) | 1973-10-31 |
Family
ID=10431676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1335710D Expired GB1335710A (en) | 1970-09-15 | 1971-09-15 | Voter circuits for triple redundant systems |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2146196C3 (en) |
GB (1) | GB1335710A (en) |
IT (1) | IT942602B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103293949A (en) * | 2013-06-08 | 2013-09-11 | 杭州和利时自动化有限公司 | On-off output channel redundancy fault-tolerant control method and redundancy on-off output channels |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA8216B (en) * | 1981-01-09 | 1983-09-28 | Westinghouse Brake & Signal | Current steering circuit |
AU3019699A (en) * | 1999-03-26 | 2000-10-16 | Sexton, James Robert | Time tolerance control unit |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB874486A (en) * | 1958-07-25 | 1961-08-10 | Smith & Sons Ltd S | Improvements in servo systems |
-
1971
- 1971-09-14 IT IT7004371A patent/IT942602B/en active
- 1971-09-15 DE DE19712146196 patent/DE2146196C3/en not_active Expired
- 1971-09-15 GB GB1335710D patent/GB1335710A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103293949A (en) * | 2013-06-08 | 2013-09-11 | 杭州和利时自动化有限公司 | On-off output channel redundancy fault-tolerant control method and redundancy on-off output channels |
CN103293949B (en) * | 2013-06-08 | 2016-02-03 | 杭州和利时自动化有限公司 | Output switch parameter passage redundant fault-tolerant control method and Redundanter schalter amount output channel |
Also Published As
Publication number | Publication date |
---|---|
DE2146196B2 (en) | 1981-06-19 |
IT942602B (en) | 1973-04-02 |
DE2146196A1 (en) | 1972-03-16 |
DE2146196C3 (en) | 1982-02-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3410803C2 (en) | System for the transmission of information from several data acquisition devices to a central receiving and recording station, in particular for the transmission of seismic data strung together | |
GB1493899A (en) | Series closed loop transmission system | |
ES480480A1 (en) | Fault-tolerant clock signal distribution arrangement | |
US3725818A (en) | Voter circuits for three-channel redundant systems | |
ES478885A1 (en) | Supervisory circuit for redundant channel control systems | |
GB1473552A (en) | Control apparatus for protection switching systems and to systems including such apparatus | |
GB1335710A (en) | Voter circuits for triple redundant systems | |
GB1387874A (en) | Apparatus for recording and reproducing quadraphonic sound | |
US4071700A (en) | Testing apparatus | |
GB945354A (en) | Improvements in or relating to destination coded signal transmission systems | |
ES8405535A1 (en) | Combining replicated sub-system outputs. | |
GB1122472A (en) | Systems for testing components of logic circuits | |
US5414718A (en) | Three-input poller | |
JPS5525121A (en) | Switching control system of hybrid type double system controller | |
SU405106A1 (en) | DEVICE TO CONTROL MULTICHANNEL CONTROL SYSTEM | |
US3824621A (en) | Multi-channel tape playing device | |
SU1665539A1 (en) | Redundant video amplifier | |
JPS5720848A (en) | Automatic switching device for double system device | |
SU468242A1 (en) | Redundant device | |
GB1079039A (en) | Improvements in or relating to signal transmission systems | |
GB1103621A (en) | Improvements in and relating to autostabilisation systems | |
SU944140A2 (en) | Device for automatic switching of communication telegraphy channels | |
GB964901A (en) | A synchronising system for a time division multiplex pulse code modulation system | |
JPS5619253A (en) | Fault detecting system | |
GB1209304A (en) | Improvements in or relating to electrical pulse monitoring circuits |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |