JPS57125413A - Temperature-sensing control device - Google Patents

Temperature-sensing control device

Info

Publication number
JPS57125413A
JPS57125413A JP1014181A JP1014181A JPS57125413A JP S57125413 A JPS57125413 A JP S57125413A JP 1014181 A JP1014181 A JP 1014181A JP 1014181 A JP1014181 A JP 1014181A JP S57125413 A JPS57125413 A JP S57125413A
Authority
JP
Japan
Prior art keywords
resistance
flowed
disconnected
temperature sensitive
active
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.)
Pending
Application number
JP1014181A
Other languages
Japanese (ja)
Inventor
Takao Toda
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP1014181A priority Critical patent/JPS57125413A/en
Publication of JPS57125413A publication Critical patent/JPS57125413A/en
Pending 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Temperature (AREA)

Abstract

PURPOSE:To prevent the occurrence of troubles such as overheating and fire, by stopping the operation of an apparatus immediately when a temperature sensitive element is disconnected. CONSTITUTION:In the normal operation, DC voltages which appear in output terminals (a) and (b) of a bridge circuit 1 are operated in accordance with the change of the resistance value of a temperature sensitive element 4. However, if the element 4 is disconnected, a voltage approximating a power source voltage +Vcc is applied to the cathode of a Zener diode 9 to make the diode 9 conductive, and a large current is flowed to a resistance 10 for stabilizing a transistor TR. As the result, the base of a TR11 becomes high-potential, and the TR11 becomes conductive. Consequently, the output current from an active element 6 is flowed to the earth potetial point through an active elemen protecting resistance 12 and the TR11 to cut off the power supply to a heater control circuit 8 for heating.
JP1014181A 1981-01-28 1981-01-28 Temperature-sensing control device Pending JPS57125413A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1014181A JPS57125413A (en) 1981-01-28 1981-01-28 Temperature-sensing control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1014181A JPS57125413A (en) 1981-01-28 1981-01-28 Temperature-sensing control device

Publications (1)

Publication Number Publication Date
JPS57125413A true JPS57125413A (en) 1982-08-04

Family

ID=11741998

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1014181A Pending JPS57125413A (en) 1981-01-28 1981-01-28 Temperature-sensing control device

Country Status (1)

Country Link
JP (1) JPS57125413A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01261713A (en) * 1988-04-13 1989-10-18 Matsushita Electric Ind Co Ltd Temperature control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01261713A (en) * 1988-04-13 1989-10-18 Matsushita Electric Ind Co Ltd Temperature control circuit

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