GB1450927A - Thermostat circuits - Google Patents

Thermostat circuits

Info

Publication number
GB1450927A
GB1450927A GB5976073A GB5976073A GB1450927A GB 1450927 A GB1450927 A GB 1450927A GB 5976073 A GB5976073 A GB 5976073A GB 5976073 A GB5976073 A GB 5976073A GB 1450927 A GB1450927 A GB 1450927A
Authority
GB
United Kingdom
Prior art keywords
triac
resistor
circuit
thermostat
ntc resistor
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
GB5976073A
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB1450927A publication Critical patent/GB1450927A/en
Expired legal-status Critical Current

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

1450927 Thermostat circuit SIEMENS AKSJESELSKAP 27 Dec 1973 [29 Dec 1972] 59760/73 Heading H2H A thermostat circuit comprises a temperature sensitive resistor 4 in or in parallel with the igniting circuit of a triac 2, is arranged with other components on a heatsink and is connected so that the currents through the temperature dependent resistor when the triac is on and off cause the circuit to exhibit thermal hysteresis. As shown, 4 is a NTC resistor and is mounted with resistors 5 and 9 on a heatsink. The load 1 is a heating element. Terminals 13 and 16 are supplied with A.C. With the triac off and the NTC resistor hot flow resistance, current flow is via resistors 5, 4, 6 and 8. As the NTC resistor cools, the voltage across it rises until it is sufficient to fire diac 3 and the triac. The current path through 4 now becomes 7, 6, 4, 2 and this current is arranged to be greater than that with the triac off. The triac stays on until the NTC resistor resistance drops sufficiently for the diac to turn off. The 90 degree phase shift introduced by capacitor 7 (which could be replaced by an inductor) minimizes radio interference by firing the triac at the zero crossings. The series circuit of resistor 9 and potentiometer 10 allows variation of the thermostat setting. The circuit may be used in a refrigeration system with a PTC resistor. Several variations including placing the potentiometer 10 in series or parallel with the temperature sensor to control its operating point are described.
GB5976073A 1972-12-29 1973-12-27 Thermostat circuits Expired GB1450927A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO4830/72A NO131745C (en) 1972-12-29 1972-12-29

Publications (1)

Publication Number Publication Date
GB1450927A true GB1450927A (en) 1976-09-29

Family

ID=19880645

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5976073A Expired GB1450927A (en) 1972-12-29 1973-12-27 Thermostat circuits

Country Status (3)

Country Link
GB (1) GB1450927A (en)
NO (1) NO131745C (en)
SE (1) SE395325B (en)

Also Published As

Publication number Publication date
NO131745C (en) 1975-07-30
NO131745B (en) 1975-04-07
SE395325B (en) 1977-08-08

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee