JPS5767829A - Temperature difference detection circuit - Google Patents

Temperature difference detection circuit

Info

Publication number
JPS5767829A
JPS5767829A JP55142918A JP14291880A JPS5767829A JP S5767829 A JPS5767829 A JP S5767829A JP 55142918 A JP55142918 A JP 55142918A JP 14291880 A JP14291880 A JP 14291880A JP S5767829 A JPS5767829 A JP S5767829A
Authority
JP
Japan
Prior art keywords
temperature
voltage
difference
input terminal
comparator
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.)
Granted
Application number
JP55142918A
Other languages
Japanese (ja)
Other versions
JPS6129650B2 (en
Inventor
Tadashi Mizushima
Takashi Kato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP55142918A priority Critical patent/JPS5767829A/en
Publication of JPS5767829A publication Critical patent/JPS5767829A/en
Publication of JPS6129650B2 publication Critical patent/JPS6129650B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

PURPOSE:To detect a temperature, difference without using a differential amplifier, by connecting one resistor among the resistors connecting with temperature detecting elements in series, to a high potential side for a power source voltage and the other one to a low potential side. CONSTITUTION:A vaporizer temperature detection element 1 is connected to earth side for its series resistor R1, and an outdoor temperature detection element 2 is connected to power source side Vcc for its series resistance R2. The detection voltage VT1 of the element 1 and the detection voltage VT2' of the resistance R2 are inputted together directly through the resistances R7 and R8. Consequently, voltage difference VT1-TT2 which corresponds to a difference between vaporizer temperature T1 and outdoor temperature T2 appears at the negative phase input terminal of a voltage comparator 4. Then, the voltage VT at the negative phase input terminal of the comparator 4, which corresponds to optical temperature difference DELTAT= T2-T1, is supplied to the positive phase input terminal of the comparator 4 through resistances R5 and R6, and consequently a relay 5 is put in operation when the temperature difference exceeds the DELTAT, thereby the switching of the heating operation and defrosting operation of a defrosting control circuit is executed.
JP55142918A 1980-10-15 1980-10-15 Temperature difference detection circuit Granted JPS5767829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55142918A JPS5767829A (en) 1980-10-15 1980-10-15 Temperature difference detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55142918A JPS5767829A (en) 1980-10-15 1980-10-15 Temperature difference detection circuit

Publications (2)

Publication Number Publication Date
JPS5767829A true JPS5767829A (en) 1982-04-24
JPS6129650B2 JPS6129650B2 (en) 1986-07-08

Family

ID=15326645

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55142918A Granted JPS5767829A (en) 1980-10-15 1980-10-15 Temperature difference detection circuit

Country Status (1)

Country Link
JP (1) JPS5767829A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02275330A (en) * 1989-04-17 1990-11-09 Agency Of Ind Science & Technol Method for measuring temperature difference in magnetic field
JP2018146459A (en) * 2017-03-08 2018-09-20 株式会社オートネットワーク技術研究所 Fault detection circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49110391A (en) * 1973-02-20 1974-10-21

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49110391A (en) * 1973-02-20 1974-10-21

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02275330A (en) * 1989-04-17 1990-11-09 Agency Of Ind Science & Technol Method for measuring temperature difference in magnetic field
JP2018146459A (en) * 2017-03-08 2018-09-20 株式会社オートネットワーク技術研究所 Fault detection circuit

Also Published As

Publication number Publication date
JPS6129650B2 (en) 1986-07-08

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term