GB451141A - Improvements in electric thermostats - Google Patents

Improvements in electric thermostats

Info

Publication number
GB451141A
GB451141A GB15876/35A GB1587635A GB451141A GB 451141 A GB451141 A GB 451141A GB 15876/35 A GB15876/35 A GB 15876/35A GB 1587635 A GB1587635 A GB 1587635A GB 451141 A GB451141 A GB 451141A
Authority
GB
United Kingdom
Prior art keywords
bridge
temperature
valve
oscillation
output
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
Application number
GB15876/35A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB15876/35A priority Critical patent/GB451141A/en
Priority to US81969A priority patent/US2093745A/en
Publication of GB451141A publication Critical patent/GB451141A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • 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
    • G05D23/2451—Details of the regulator
    • G05D23/2453—Details of the regulator using discharge tubes

Abstract

451,141. Automatic control systems. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and WESTELL, E. P. L., c/o General Electric Co., Ltd., Coventry. May 31, 1935, No. 15876. [Class 38 (iv)] Temperature.-The input of an amplifier is connected to one diagonal of a Wheatstone bridge and the output to the other so that when in balance no oscillation. occurs. Means causing a current variation according to the state of oscillation of the amplifier caused by a degree of unbalance of the bridge control an element supplying heat to the space containing the bridge to maintain its temperature constant. The bridge may itself comprise the heating element. The anode circuits of two thermionic valves 15, 25, Fig. 4, are connected through the windings of a relay 21 so that their energizations under normal conditions balance. The valve 15 has its grid circuit connected through the transformer 12 across the diagonal 4, 41 of the bridge 1 subject to the temperature of a heated space 11 and the output of valve 25, which amplifies the output of the valve 15, is connected through the transformer 52 to the other diagonal 6, 6<1>. When the bridge temperature falls sufficiently the compling through the bridge is adequate to establish oscillation and the relay 21 becomes unbalanced so that the contacts 38 are closed and heating current is supplied to the resistance 36 to raise the temperature. The valve 15 is at the same time rendered more susceptible of oscillation with a view to avoidance of hunting by a change in grid bias caused by the winding 34 of the transformer 52. The connections shown provide for the application of D.C. to the bridge and an instrument 56 measures the D.C. out of balance current and acts as a distant reading thermometer. It may also act as an alarm or safety device if a wide departure of temperature occurs. Fig. 3 shows a form in which the bridge is at the same time the heating means for the space 11 the output of the valve 25, supplemented if required by alternating current supplied over the impedances 44, 45 from the source 37, traversing the bridge 1. The invention is not applicable to cases where temperature deviations in both senses may occur.
GB15876/35A 1935-05-31 1935-05-31 Improvements in electric thermostats Expired GB451141A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB15876/35A GB451141A (en) 1935-05-31 1935-05-31 Improvements in electric thermostats
US81969A US2093745A (en) 1935-05-31 1936-05-26 Electric constant temperature device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2093745X 1935-05-31
GB15876/35A GB451141A (en) 1935-05-31 1935-05-31 Improvements in electric thermostats

Publications (1)

Publication Number Publication Date
GB451141A true GB451141A (en) 1936-07-30

Family

ID=62200148

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15876/35A Expired GB451141A (en) 1935-05-31 1935-05-31 Improvements in electric thermostats

Country Status (2)

Country Link
US (1) US2093745A (en)
GB (1) GB451141A (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557224A (en) * 1945-06-29 1951-06-19 Bailey Meter Co Control system
US2617864A (en) * 1946-10-11 1952-11-11 Henry H Johnson Temperature-responsive control system for operating heat metering devices or the like
US2581977A (en) * 1948-09-09 1952-01-08 William F Stahl Apparatus for sealing plastics
US2673917A (en) * 1948-10-21 1954-03-30 George V Woodling Heating unit control circuit
US2632086A (en) * 1949-07-15 1953-03-17 Honeywell Regulator Co Temperature control apparatus
US2616020A (en) * 1950-03-07 1952-10-28 Shell Dev Automatic temperature control
US2646544A (en) * 1950-09-01 1953-07-21 Atomic Energy Commission Automatic temperature regulator
CH305754A (en) * 1952-03-04 1955-03-15 Ebauches Sa Electronic thermostat.
US2727975A (en) * 1953-12-14 1955-12-20 Gen Electric Electric heating apparatus
GB778397A (en) * 1954-06-03 1957-07-03 Antonio Negromanti An improved electro-thermal regulating device, particularly suitable for electrically heated plates
US2947915A (en) * 1954-12-03 1960-08-02 Honeywell Regulator Co Electrical control apparatus
US2852653A (en) * 1956-08-17 1958-09-16 Collins Radio Co Ferrite heater and heat sensor
US2866067A (en) * 1957-02-11 1958-12-23 Northern Electric Co Electric heating circuit for electric heating devices
GB858949A (en) * 1957-09-20 1961-01-18 Napier & Son Ltd Thermostatic control of electric heaters
US3327517A (en) * 1964-12-01 1967-06-27 Union Oil Co Precise thermocouple reference for instrument calibration

Also Published As

Publication number Publication date
US2093745A (en) 1937-09-21

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