GB893358A - A new or improved temperature control apparatus - Google Patents
A new or improved temperature control apparatusInfo
- Publication number
- GB893358A GB893358A GB6387/58A GB638758A GB893358A GB 893358 A GB893358 A GB 893358A GB 6387/58 A GB6387/58 A GB 6387/58A GB 638758 A GB638758 A GB 638758A GB 893358 A GB893358 A GB 893358A
- Authority
- GB
- United Kingdom
- Prior art keywords
- temperature
- bridge circuit
- heater
- relay
- pulses
- 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
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
- G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Temperature (AREA)
Abstract
893,358. Automatic temperature-control systems. CROSLAND, R., G., and MOLINS MACHINE CO. Ltd. Feb. 26, 1959 [Feb. 27, 1958], No. 6387/58. Class 38 (4). In an automatic temperature-control system, variations of temperature produced by an electric heater influence a resistance thermometer in a bridge circuit supplied with pulses of half-wave rectified A.C. so that output from the bridge circuit when unbalanced in one sense starts an oscillator to switch the heater on by operating a relay. In Fig. 3 a resistor 21, variable with a temperature produced by a heater 65, e.g. in a radiation gauge, forms part of a bridge circuit supplied with unidirectional pulses through a rectifier 20. The arrangement is such that if the temperature falls below a predetermined value the output pulses from the bridge circuit are of a suitable polarity to trigger a blocking oscillator transistor 30. The resulting output from blocking oscillator transformer 29 triggers a further blocking oscillator transistor 44 to operate a relay 52 and thereby energize heater 65. Relay 52 is operated intermittently to maintain the desired temperature but operation at the pulse frequency is prevented by condenser 54. The blocking oscillators are provided with damping diodes 34a, 49 and a thermistor 32 varies the bias applied to transistor 30 to compensate for ambient temperature changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6387/58A GB893358A (en) | 1958-02-27 | 1958-02-27 | A new or improved temperature control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6387/58A GB893358A (en) | 1958-02-27 | 1958-02-27 | A new or improved temperature control apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB893358A true GB893358A (en) | 1962-04-11 |
Family
ID=9813588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6387/58A Expired GB893358A (en) | 1958-02-27 | 1958-02-27 | A new or improved temperature control apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB893358A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115250549A (en) * | 2022-09-22 | 2022-10-28 | 广州中基国威电子科技有限公司 | Heating control method, heating control circuit and heating device |
-
1958
- 1958-02-27 GB GB6387/58A patent/GB893358A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115250549A (en) * | 2022-09-22 | 2022-10-28 | 广州中基国威电子科技有限公司 | Heating control method, heating control circuit and heating device |
| CN115250549B (en) * | 2022-09-22 | 2022-12-13 | 广州中基国威电子科技有限公司 | Heating control method, heating control circuit and heating device |
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