GB802598A - Improvements in or relating to photo-electric relays - Google Patents
Improvements in or relating to photo-electric relaysInfo
- Publication number
- GB802598A GB802598A GB1913956A GB1913956A GB802598A GB 802598 A GB802598 A GB 802598A GB 1913956 A GB1913956 A GB 1913956A GB 1913956 A GB1913956 A GB 1913956A GB 802598 A GB802598 A GB 802598A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- photo
- conducting
- illumination
- conductive
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/012—Automatic controllers electric details of the transmission means
- G05B11/017—Automatic controllers electric details of the transmission means using photo-electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
- Electronic Switches (AREA)
Abstract
802,598. Photo-transistor circuits. BAILEY METERS & CONTROLS, Ltd. June 19, 1957 [June 20, 1956], No. 19139/56. Class 40 (6). A photo-sensitive circuit comprises a photosensitive transistor coupled to a second transistor and a positive feedback path from the second transistor to the first, the arrangement being such that the second transistor is either in a conducting or non-conducting condition depending on whether the illumination of the first transistor is above or below a predetermined value. In the circuit shown, in the absence of illumination, photo-transistor 1 is substantially non-conducting and transistor 3 is conducting so that a relay 31 is operated. When the illumination increases above a predetermined value the photo-transistor 1 becomes more conductive and transistor 3 is cut off, releasing the relay, the change-over from non-conductive to conductive states being assisted by feed-back produced by the common emitter resistor 5. In the conducting condition transistor 3 has a low collector potential and therefore does not dissipate much power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1913956A GB802598A (en) | 1956-06-20 | 1956-06-20 | Improvements in or relating to photo-electric relays |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1913956A GB802598A (en) | 1956-06-20 | 1956-06-20 | Improvements in or relating to photo-electric relays |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB802598A true GB802598A (en) | 1958-10-08 |
Family
ID=10124405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1913956A Expired GB802598A (en) | 1956-06-20 | 1956-06-20 | Improvements in or relating to photo-electric relays |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB802598A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5487763A (en) * | 1987-03-12 | 1996-01-30 | Exxon Chemical Patents Inc. | Fuel compositions |
-
1956
- 1956-06-20 GB GB1913956A patent/GB802598A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5487763A (en) * | 1987-03-12 | 1996-01-30 | Exxon Chemical Patents Inc. | Fuel compositions |
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