JPS578801A - Temperature controller - Google Patents

Temperature controller

Info

Publication number
JPS578801A
JPS578801A JP8280780A JP8280780A JPS578801A JP S578801 A JPS578801 A JP S578801A JP 8280780 A JP8280780 A JP 8280780A JP 8280780 A JP8280780 A JP 8280780A JP S578801 A JPS578801 A JP S578801A
Authority
JP
Japan
Prior art keywords
voltage
resistance
comparator
reference voltage
resistances
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
JP8280780A
Other languages
Japanese (ja)
Inventor
Masateru Mutsuhira
Mitsuo Shibusawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP8280780A priority Critical patent/JPS578801A/en
Publication of JPS578801A publication Critical patent/JPS578801A/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
    • 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)
  • Feedback Control In General (AREA)
  • Control Of Temperature (AREA)

Abstract

PURPOSE:To decrease the number of parts and to improve reliability by providing a switching means, turned on and off by an external signal, in parallel to part of a resistance constituting a voltage dividing circuit which obtains a reference voltage. CONSTITUTION:A thermistor TH1 as a temperature detector is connected in series to resistances R1 and R2 and a variable resistance VR1 and a power voltage Vcc is divided to supply a voltage Vv, which corresponds to a detected temperature, to the noninverted input terminal of a comparator 1. A voltage Vs obtained by dividing the power voltage Vcc by a voltage dividing circuit consisting of resistances R7-R9 is applied to the inverted input terminal of the comparator 1 as the reference voltage and then compared with a voltage Vv. The collector and emitter of a transistor TR1 are connected to both terminals of the resistance R7 and an extermal switching signal is applied to the base of a TR1, which then turns on and off. When the switching signal is at a low potential, the TR1 turns on to short-circuit the resistance R7, so that a reference voltage Vs-c is higher than a reference voltage Vs-d when the TR1 is off. Therefore, the temperature detection voltage is compared by one comparator with more than one reference voltages, the number of parts is small, and the reliability is improved.
JP8280780A 1980-06-20 1980-06-20 Temperature controller Pending JPS578801A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8280780A JPS578801A (en) 1980-06-20 1980-06-20 Temperature controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8280780A JPS578801A (en) 1980-06-20 1980-06-20 Temperature controller

Publications (1)

Publication Number Publication Date
JPS578801A true JPS578801A (en) 1982-01-18

Family

ID=13784674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8280780A Pending JPS578801A (en) 1980-06-20 1980-06-20 Temperature controller

Country Status (1)

Country Link
JP (1) JPS578801A (en)

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