GB1025624A - Electronic temperature regulators - Google Patents
Electronic temperature regulatorsInfo
- Publication number
- GB1025624A GB1025624A GB2490163A GB2490163A GB1025624A GB 1025624 A GB1025624 A GB 1025624A GB 2490163 A GB2490163 A GB 2490163A GB 2490163 A GB2490163 A GB 2490163A GB 1025624 A GB1025624 A GB 1025624A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistor
- bridge
- output stage
- output
- transistor
- 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
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
- G05D23/303—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature using a sensing element having a resistance varying with temperature, e.g. thermistor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Temperature (AREA)
Abstract
1,025,624. Automatic temperature control. R. ROHLF. June 21,1963 [June 22, 1962], No. 24901/63. Heading G3R. An automatic temperature control system comprises a bridge network which includes a variable resistor P1 by means of which a desired temperature may be selected and a resistance thermometer Th which measures the temperature of the controlled apparatus, the bridge output being used to control a two state (ON-OFF) amplifier comprising two transistors T1, T2 subsequently controlling an output stage transistor so as to control the energization of a relay rel. 1 which, by way of its normally open contact, controls the apparatus heating circuit and thus the heating of an element H associated with a negative temperature coefficient resistor Tr connected, in parallel with a fixed resistor R 1 , in a further arm of the bridge, the resistor Tr functioning to bias the bridge to a higher than normal value thus providing the system with a measure of "anticipation". A connection GK from the bridge output to the base of the output transistor T3 provides a safety device in the event of a short circuit of the resistance thermometer Th. A further output stage comprising a fourth transistor and a second relay r.e.1. 2, together with a variable resistor P 2 , may be provided to follow the first output stage, the resistor P 2 being connected in series with the resistor Th. Thus should the apparatus reach a selectable critical value the further output stage becomes operative, for example, to provide an alarm or operate a cooling system.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER0032977 | 1962-06-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1025624A true GB1025624A (en) | 1966-04-14 |
Family
ID=7403945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2490163A Expired GB1025624A (en) | 1962-06-22 | 1963-06-21 | Electronic temperature regulators |
Country Status (3)
Country | Link |
---|---|
AT (1) | AT242399B (en) |
CH (1) | CH412422A (en) |
GB (1) | GB1025624A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113332128A (en) * | 2021-06-03 | 2021-09-03 | 范敏 | Control circuit of steam hot compress type eye health care instrument |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2741657C3 (en) * | 1977-09-16 | 1981-08-13 | Gerstel, Eberhard, 4330 Mülheim | Safety circuit for a two-point controller with contact thermometer |
-
1963
- 1963-06-20 CH CH769163A patent/CH412422A/en unknown
- 1963-06-21 AT AT500963A patent/AT242399B/en active
- 1963-06-21 GB GB2490163A patent/GB1025624A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113332128A (en) * | 2021-06-03 | 2021-09-03 | 范敏 | Control circuit of steam hot compress type eye health care instrument |
Also Published As
Publication number | Publication date |
---|---|
CH412422A (en) | 1966-04-30 |
AT242399B (en) | 1965-09-10 |
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