ZA781409B - Fail-safe solid state logic - Google Patents
Fail-safe solid state logicInfo
- Publication number
- ZA781409B ZA781409B ZA00781409A ZA781409A ZA781409B ZA 781409 B ZA781409 B ZA 781409B ZA 00781409 A ZA00781409 A ZA 00781409A ZA 781409 A ZA781409 A ZA 781409A ZA 781409 B ZA781409 B ZA 781409B
- Authority
- ZA
- South Africa
- Prior art keywords
- fail
- solid state
- state logic
- safe solid
- safe
- Prior art date
Links
- 239000007787 solid Substances 0.000 title 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or train
- B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/007—Fail-safe circuits
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Logic Circuits (AREA)
- Manipulation Of Pulses (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/779,192 US4097764A (en) | 1977-03-18 | 1977-03-18 | Fail-safe solid state logic |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA781409B true ZA781409B (en) | 1979-03-28 |
Family
ID=25115625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA00781409A ZA781409B (en) | 1977-03-18 | 1978-03-10 | Fail-safe solid state logic |
Country Status (6)
Country | Link |
---|---|
US (1) | US4097764A (nl) |
CA (1) | CA1091307A (nl) |
GB (1) | GB1570864A (nl) |
IT (1) | IT1093208B (nl) |
NL (1) | NL7802932A (nl) |
ZA (1) | ZA781409B (nl) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4336461A (en) * | 1980-09-22 | 1982-06-22 | E. I. Du Pont De Nemours And Company | Fail-safe apparatus |
US4812677A (en) * | 1987-10-15 | 1989-03-14 | Motorola | Power supply control with false shut down protection |
US6381506B1 (en) * | 1996-11-27 | 2002-04-30 | Victor Grappone | Fail-safe microprocessor-based control and monitoring of electrical devices |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3226648A (en) * | 1962-01-29 | 1965-12-28 | Burroughs Corp | Clock system for electronic computers |
US3328702A (en) * | 1965-03-31 | 1967-06-27 | Bell Telephone Labor Inc | Pulse train modification circuits |
GB1338983A (en) * | 1971-02-10 | 1973-11-28 | Suwa Seikosha Kk | Electronic watches |
US3721833A (en) * | 1971-08-30 | 1973-03-20 | Branson Instr | Electronic incidence and coincidence safety control circuit |
US3909632A (en) * | 1972-08-21 | 1975-09-30 | Gen Signal Corp | Fail-safe logic circuitry for vehicle transportation control |
-
1977
- 1977-03-18 US US05/779,192 patent/US4097764A/en not_active Expired - Lifetime
-
1978
- 1978-02-10 CA CA296,703A patent/CA1091307A/en not_active Expired
- 1978-02-20 GB GB6655/78A patent/GB1570864A/en not_active Expired
- 1978-03-03 IT IT20891/78A patent/IT1093208B/it active
- 1978-03-10 ZA ZA00781409A patent/ZA781409B/xx unknown
- 1978-03-17 NL NL7802932A patent/NL7802932A/nl unknown
Also Published As
Publication number | Publication date |
---|---|
IT7820891A0 (it) | 1978-03-03 |
CA1091307A (en) | 1980-12-09 |
IT1093208B (it) | 1985-07-19 |
GB1570864A (en) | 1980-07-09 |
US4097764A (en) | 1978-06-27 |
NL7802932A (nl) | 1978-09-20 |
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