JPS55109938A - Circuit system of digital thermometer - Google Patents
Circuit system of digital thermometerInfo
- 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
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
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)
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 |
-
1979
- 1979-02-19 JP JP1800779A patent/JPS55109938A/en active Pending
Cited By (3)
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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