JPS55109938A - Circuit system of digital thermometer - Google Patents

Circuit system of digital thermometer

Info

Publication number
JPS55109938A
JPS55109938A JP1800779A JP1800779A JPS55109938A JP S55109938 A JPS55109938 A JP S55109938A JP 1800779 A JP1800779 A JP 1800779A JP 1800779 A JP1800779 A JP 1800779A JP S55109938 A JPS55109938 A JP S55109938A
Authority
JP
Japan
Prior art keywords
comparator
voltage
thermistor
potential
switches
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
JP1800779A
Other languages
Japanese (ja)
Inventor
Takashi Inaoka
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP1800779A priority Critical patent/JPS55109938A/en
Publication of JPS55109938A publication Critical patent/JPS55109938A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To compose a digital thermometer of a small number of components by using a thermistor without using a logarithmic converter, etc.
CONSTITUTION: A reference voltage of a high potential voltage-divided by thermistor Th grounded and connected in series to resistance R2 applied with a power voltage via switch S1-b is applied to comparator 1. Here, when the charging voltage of the power voltage of capacitor C determined by resistance R1, etc., exceeds the reference voltage, the output of comparator 1 is inverted and through switch driver 2, switches S1-a, S1-b and S1-c are switched interlocking. Consequently, comparator 1 is a pplied with the reference voltage of a low potential and when the potential of discharged capacitor C lowers below the reference potential, the output inversion of comparator 1 switches switches S1-a, S1-b and S1-c to let counter 5 count the switching frequency of a switch in direct proportion to the detection temperature of thermistor Th. Digital display of a temperature can therefore be carried out easily and securely without using and A/D converter.
COPYRIGHT: (C)1980,JPO&Japio
JP1800779A 1979-02-19 1979-02-19 Circuit system of digital thermometer Pending JPS55109938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1800779A JPS55109938A (en) 1979-02-19 1979-02-19 Circuit system of digital thermometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1800779A JPS55109938A (en) 1979-02-19 1979-02-19 Circuit system of digital thermometer

Publications (1)

Publication Number Publication Date
JPS55109938A true JPS55109938A (en) 1980-08-23

Family

ID=11959614

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1800779A Pending JPS55109938A (en) 1979-02-19 1979-02-19 Circuit system of digital thermometer

Country Status (1)

Country Link
JP (1) JPS55109938A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58211148A (en) * 1982-06-02 1983-12-08 Konishiroku Photo Ind Co Ltd Color photographic sensitive material
JPS6252615A (en) * 1985-08-30 1987-03-07 Kenzo Watanabe Method and circuit for controlling temperature
JPS62267630A (en) * 1986-05-16 1987-11-20 Yokogawa Electric Corp Temperature measuring circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58211148A (en) * 1982-06-02 1983-12-08 Konishiroku Photo Ind Co Ltd Color photographic sensitive material
JPS6252615A (en) * 1985-08-30 1987-03-07 Kenzo Watanabe Method and circuit for controlling temperature
JPS62267630A (en) * 1986-05-16 1987-11-20 Yokogawa Electric Corp Temperature measuring circuit

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