GB2011141A - Temperature sensitive switching arrangements - Google Patents
Temperature sensitive switching arrangementsInfo
- Publication number
- GB2011141A GB2011141A GB7848564A GB7848564A GB2011141A GB 2011141 A GB2011141 A GB 2011141A GB 7848564 A GB7848564 A GB 7848564A GB 7848564 A GB7848564 A GB 7848564A GB 2011141 A GB2011141 A GB 2011141A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thyristor
- temperature sensitive
- switching arrangements
- turn
- sensitive switching
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/30—Modifications for providing a predetermined threshold before switching
- H03K17/305—Modifications for providing a predetermined threshold before switching in thyristor switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Conversion In General (AREA)
Abstract
A switch such as a thyristor Th or a triac is biassed by a voltage e.g. 350 mV or current which will not turn it on at a normal temperature. As temperature increases, the bias required to turn on a thyristor reduces, so eventually it turns on in response to its bias. Once on, the thyristor stays on unless current through it becomes less than the minimum holding current value. Simple threshold circuits in which the thyristor turns on at a set temperature are described as well as &cirf& a rate-of-rise sensitive circuit. <IMAGE>
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7848564A GB2011141A (en) | 1977-12-21 | 1978-12-14 | Temperature sensitive switching arrangements |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5311177 | 1977-12-21 | ||
| GB7848564A GB2011141A (en) | 1977-12-21 | 1978-12-14 | Temperature sensitive switching arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2011141A true GB2011141A (en) | 1979-07-04 |
Family
ID=26267190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7848564A Pending GB2011141A (en) | 1977-12-21 | 1978-12-14 | Temperature sensitive switching arrangements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2011141A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2215502A (en) * | 1988-02-02 | 1989-09-20 | Nittan Co Ltd | A fire detector having a protective cover |
-
1978
- 1978-12-14 GB GB7848564A patent/GB2011141A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2215502A (en) * | 1988-02-02 | 1989-09-20 | Nittan Co Ltd | A fire detector having a protective cover |
| US4929093A (en) * | 1988-02-02 | 1990-05-29 | Nittan Company | Fire detector having a protective cover |
| GB2215502B (en) * | 1988-02-02 | 1992-10-21 | Nittan Co Ltd | A fire detector having a protective cover |
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