GB1085597A - Temperature control circuit - Google Patents
Temperature control circuitInfo
- Publication number
- GB1085597A GB1085597A GB39973/65A GB3997365A GB1085597A GB 1085597 A GB1085597 A GB 1085597A GB 39973/65 A GB39973/65 A GB 39973/65A GB 3997365 A GB3997365 A GB 3997365A GB 1085597 A GB1085597 A GB 1085597A
- Authority
- GB
- United Kingdom
- Prior art keywords
- energized
- relay
- transistor
- resistor
- bridge
- 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
1,085,597. Automatic control of temperature. SWIPORT N.V. Sept. 20, 1965 [Sept. 25, 1964], No.39973/65. Heading G3R. In an automatic temperature control system a temperature responsive resistor 5 is connected with resistors 5-9 in an A. C. energized Wheatstone bridge the error voltage of which is applied through a capacitor 10 to a directly coupled amplifier, comprising transistors 11, 12, 13. The amplified error signal is fed to the base of a transistor 30 having in the collector circuit a relay 31 for switching on and off in an unspecified manner, a heat source not shown. The transistor 30 is energized from a secondary 3 of a transformer through a rectifier 32 and has a resistor 34 in the emitter circuit of a high value so that the collector current is proportional to the voltage applied to the base. The relay 31 has a parallel capacitor 33 of a low value to cause the relay armature to slightly vibrate when the relay is energized. The bridge is energized from a secondary 2 of the transformer. Alternating current degenerative feedback for the directly coupled amplifier is derived from a resistor 24 and direct current degenerative feedback through a filter comprising resistors 25-27 and capacitors 28, 29. In another embodiment, the bridge is shunted by a diode to provide a direct-current component which, through a transistor differential amplifier, energizes an error indicating meter. Thermal feedback is provided by an auxiliary heat-sensitive resistor provided with a heating coil energized through an additional make contact of the relay 31, the combination is chosen to compensate for the temperature coefficient of the emitter-base voltage of the transistor 30.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6411234A NL6411234A (en) | 1964-09-25 | 1964-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1085597A true GB1085597A (en) | 1967-10-04 |
Family
ID=19791110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB39973/65A Expired GB1085597A (en) | 1964-09-25 | 1965-09-20 | Temperature control circuit |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB1085597A (en) |
| NL (1) | NL6411234A (en) |
-
1964
- 1964-09-25 NL NL6411234A patent/NL6411234A/xx unknown
-
1965
- 1965-09-20 GB GB39973/65A patent/GB1085597A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL6411234A (en) | 1966-03-28 |
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