JPH0344646B2 - - Google Patents
Info
- Publication number
- JPH0344646B2 JPH0344646B2 JP14462084A JP14462084A JPH0344646B2 JP H0344646 B2 JPH0344646 B2 JP H0344646B2 JP 14462084 A JP14462084 A JP 14462084A JP 14462084 A JP14462084 A JP 14462084A JP H0344646 B2 JPH0344646 B2 JP H0344646B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- terminal
- microcomputer
- resistor
- temperature display
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 210000004899 c-terminal region Anatomy 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indicating Measured Values (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電子機器における電子回路の温度表示
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature display device for an electronic circuit in an electronic device.
従来例の構成とその問題点
従来の温度表示装置について図面を参照しなが
ら説明を行う。Configuration of conventional example and its problems A conventional temperature display device will be explained with reference to the drawings.
第１図は従来の温度の表示装置の回路図を示す
ものである。第１図において、１はマイクロコン
ピユータ、２は感温素子で、その感温素子の一端
には、３個の温度設定用抵抗５，６，７の一端
と、コンパレータ８の端子が接続されている。
３個の温度設定用抵抗５，６，７の他端はそれぞ
れダイオード９，１０，１１のアノードに接続さ
れ、ダイオード９のカソードには温度表示用
LED１２のカソードと、マイクロコンピユータ
１の端子Ａに、ダイオード１０のカソードには温
度表示用LED１３のカソードとマイクロコンピ
ユータ１の端子Ｂに、ダイオード１１のカソード
には温度表示用LED１４のカソードとマイクロ
コンピユータの端子Ｃに接続されている。温度表
示用LED１２，１３，１４のアノードには抵抗
１５の一端が接続されている。コンパレータ８の
端子には抵抗１７と１８の接続点が接続され、
抵抗１７の他端は直流電圧１９の側に、抵抗１
８の他端は直流電圧１９の側に接続されてい
る。コンパレータ８の出力はマイクロコンピユー
タの端子Ｄに接続されている。直流電圧１９の
電圧は抵抗１５と感温素子２の他端とマイクロコ
ンピユータ１の端子Ｇに接続され、電圧はマイ
クロコンピユータの端子Ｈに接続されている。 FIG. 1 shows a circuit diagram of a conventional temperature display device. In FIG. 1, 1 is a microcomputer, 2 is a temperature sensing element, and one end of the temperature sensing element is connected to one end of three temperature setting resistors 5, 6, 7 and a terminal of a comparator 8. There is.
The other ends of the three temperature setting resistors 5, 6, and 7 are connected to the anodes of diodes 9, 10, and 11, respectively, and the cathode of diode 9 is connected to the temperature display.
The cathode of the diode 12 is connected to the terminal A of the microcomputer 1, the cathode of the diode 10 is connected to the cathode of the temperature display LED 13 and terminal B of the microcomputer 1, and the cathode of the diode 11 is connected to the cathode of the temperature display LED 14 and the terminal B of the microcomputer 1. Connected to terminal C. One end of a resistor 15 is connected to the anodes of the temperature display LEDs 12, 13, and 14. The connection point of resistors 17 and 18 is connected to the terminal of comparator 8,
The other end of the resistor 17 is connected to the DC voltage 19 side.
The other end of 8 is connected to the DC voltage 19 side. The output of comparator 8 is connected to terminal D of the microcomputer. The voltage of the DC voltage 19 is connected to the resistor 15, the other end of the temperature sensing element 2, and the terminal G of the microcomputer 1, and the voltage is connected to the terminal H of the microcomputer.
以上の様に構成された温度表示装置について、
以下その動作を説明する。 Regarding the temperature display device configured as above,
The operation will be explained below.
今、抵抗５，６，７の順に検知温度が高くなる
様に抵抗を設定しておく。まず、マイクロコンピ
ユータ（以下“マイコン”と呼ぶ）のＡのみを
“Ｌ”にすると感温素子２の抵抗と抵抗５及びダ
イオード９の順方向電圧によつて決まる感温素子
２と抵抗５の接続点の電圧が、コンパレータ８の
端子の電圧として印加され、コンパレータ８の
端子の電圧と比較される。その時、コンパレー
タ８の出力が反転すれば、抵抗５で決まる温度よ
り検知温度が高いことを示す。出力が反転しなけ
れば、順次Ｂ端子のみ、Ｃ端子のみと“Ｌ”にし
ていき、出力が反転した時の温度設定用抵抗の設
定温度にて現在温度とみなす。次に、ある一定時
間、その出力たとえば、マイコンの端子Ａが、反
転すればマイコンのＡ端子の出力を“Ｌ”にし、
現在温度の表示をLED１２の点灯によつて行う。
このように、マイコン１の端子“Ａ”、“Ｂ”、
“Ｃ”を順次、前記手順で“Ｌ”に落とし、現在
温度を検知し、次に現在温度の表示を行うという
手順を一定周期毎にくり返す。 Now, set the resistors so that the detected temperature increases in the order of resistors 5, 6, and 7. First, when only A of the microcomputer (hereinafter referred to as "microcomputer") is set to "L", the connection between the temperature sensing element 2 and the resistor 5 is determined by the resistance of the temperature sensing element 2, the forward voltage of the resistor 5, and the diode 9. The voltage at the point is applied as the voltage at the terminal of the comparator 8 and compared with the voltage at the terminal of the comparator 8. At that time, if the output of the comparator 8 is inverted, it indicates that the detected temperature is higher than the temperature determined by the resistor 5. If the output is not reversed, only the B terminal and only the C terminal are set to "L" in sequence, and the set temperature of the temperature setting resistor when the output is reversed is regarded as the current temperature. Next, for a certain period of time, if the output, for example, terminal A of the microcomputer, is reversed, the output of terminal A of the microcomputer becomes "L",
The current temperature is displayed by lighting the LED 12.
In this way, the terminals “A”, “B” of microcomputer 1,
The procedure of sequentially lowering "C" to "L", detecting the current temperature, and then displaying the current temperature is repeated at regular intervals.
しかしながら、上記のような構成では、現在温
度の表示の数が多くなればなるほど、現在温度表
示用LEDから温度設定用抵抗に流れる電流を防
ぐダイオード９，１０，１１が、表示の数だけ必
要となると共に、温度検知用電圧に上記ダイオー
ドの順方向電圧が寄与するため、ダイオード９，
１０，１１の順方向電圧の温度依存性が抵抗より
大きいため、回路の雰囲気温度が変り、それに伴
つて温度検知電圧が変化し、現在温度の検知が不
確かになるという欠点を有していた。 However, in the above configuration, as the number of current temperature displays increases, the number of diodes 9, 10, and 11 that prevent current flowing from the current temperature display LED to the temperature setting resistor is required to be equal to the number of displays. At the same time, since the forward voltage of the diode contributes to the temperature detection voltage, the diode 9,
Since the temperature dependence of the forward voltages 10 and 11 is greater than that of the resistance, the ambient temperature of the circuit changes, the temperature detection voltage changes accordingly, and the current temperature detection becomes uncertain.
発明の目的
本発明は上記欠点を解消したもので、少ない部
品点数で正確な温度検知ができる温度表示装置を
提供するものである。OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks and provides a temperature display device that can accurately detect temperature with a small number of parts.
発明の構成
この目的を達成するために本発明の温度表示装
置は、温度を検知する感温素子と、この感温素子
に直列に接続されたＮ個の抵抗と、そのＮ個の抵
抗を切換える第１の切換手段と、Ｎ段階の検知を
行う現在温度検知手段と、第１の切換手段に接続
されたＮ個の発光ダイオードで温度をＮ段階で表
示する温度表示手段と、前記温度表示手段と現在
温度検知手段を交互に切換える第２の切換手段と
で構成されている。Structure of the Invention In order to achieve this object, the temperature display device of the present invention includes a temperature sensing element that detects temperature, N resistors connected in series to the temperature sensing element, and switching between the N resistors. a first switching means, a current temperature detection means for detecting N stages, a temperature display means for displaying the temperature in N stages using N light emitting diodes connected to the first switching means, and the temperature display means and a second switching means that alternately switches the current temperature detection means.
実施例の説明
以下本発明の一実施例について、図面を参照し
ながら説明する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
第２図は本発明の一実施例における温度の表示
装置を示すものである。第２図の５１は第１の切
換手段であるマイクロコンピユータ（以下“マイ
コン”と呼ぶ）、５２は直流電源、５３はサーミ
スタよりなる感温素子で、その一端は温度検知用
抵抗５４，５５，５６の一端とコンパレータ５７
の端子に接続され、コンパレータ５７の端子
には抵抗５８，５９の一端が接続され、抵抗５４
の他端には温度表示用LED６０のカソードとマ
イコン５１の端子BBが接続され、抵抗５５の他
端には温度表示用LED６１のカソードとマイコ
ン５１の端子CCが接続され、抵抗５６の他端に
は温度表示用LED６２のカソードとマイコン５
１の端子DDが接続され、コンパレータ５７の出
力はマイコン５１の端子EEに接続され、温度表
示用LED６０，６１，６２のアノードは全て接
続され、かつ抵抗６３の一端に接続され、その他
端はトランジスタ６４のコレクタに接続され、そ
のベースは抵抗６５と６６の一端に接続され、抵
抗６５の他端はマイコン５１の端子AAに接続さ
れており、直流電源５２の電圧には、抵抗５
８，６６、感温素子５３の一端とトランジスタ６
４のエミツタとマイコン５１のGG端子が接続さ
れ、直流電源５２の電圧には抵抗５９の一端と
マイコン５１のHH端子が接続されている。６７
は感温素子５３の温度をＮ段階（実施例では３段
階）で検知する現在温度検知手段、６８は温度表
示用LED６０〜６２からなる表示装置、６９は
表示装置６８により温度をＮ段階で表示する温度
表示手段、７０は温度表示手段６９と現在温度検
知手段６７とを交互に切換える第２の切換手段
で、トランジスタ６４を有する。 FIG. 2 shows a temperature display device according to an embodiment of the present invention. In FIG. 2, 51 is a microcomputer (hereinafter referred to as "microcomputer") which is the first switching means, 52 is a DC power supply, and 53 is a temperature sensing element consisting of a thermistor, one end of which is a temperature sensing resistor 54, 55, One end of 56 and comparator 57
The terminals of the comparator 57 are connected to one ends of the resistors 58 and 59, and the resistor 54 is connected to the terminal of the comparator 57.
The cathode of the temperature display LED 60 and the terminal BB of the microcomputer 51 are connected to the other end, the cathode of the temperature display LED 61 and the terminal CC of the microcomputer 51 are connected to the other end of the resistor 55, and the other end of the resistor 56 is connected to the cathode of the temperature display LED 60 and the terminal BB of the microcomputer 51. is the cathode of the temperature display LED 62 and the microcomputer 5
1 terminal DD is connected, the output of the comparator 57 is connected to the terminal EE of the microcomputer 51, the anodes of the temperature display LEDs 60, 61, and 62 are all connected, and one end of the resistor 63 is connected, and the other end is connected to the transistor. 64, its base is connected to one end of resistors 65 and 66, the other end of resistor 65 is connected to terminal AA of microcomputer 51, and the voltage of DC power supply 52 is connected to resistor 5.
8, 66, one end of the temperature sensing element 53 and the transistor 6
4 is connected to the GG terminal of the microcomputer 51, and one end of the resistor 59 and the HH terminal of the microcomputer 51 are connected to the voltage of the DC power supply 52. 67
68 is a display device consisting of temperature display LEDs 60 to 62; 69 is a display device 68 that displays the temperature in N steps; 70 is a second switching means that alternately switches between the temperature display means 69 and the current temperature detection means 67, and has a transistor 64.
以上の様に構成された温度表示装置において以
下その動作について説明する。 The operation of the temperature display device configured as described above will be explained below.
今、温度検知用抵抗５４，５５，５６の順に高
温に設定する。 Now, the temperature detection resistors 54, 55, and 56 are set to high temperatures in this order.
まずある一定期間マイコンの端子AAを“Ｈ”
にすると、トランジスタ６４はオフし、温度表示
用LEDに電流は流れず表示は行なわない。これ
と同時にマイコン５１の端子“BB”を“Ｌ”
（“CC”，“DD”は“Ｈ”）にすると、コンパレー
タ５７の端子には、抵抗５４と感温素子５３で
分圧される電圧が印加され、コンパレータ５７の
電圧と比較される。その時、コンパレータ５７
の出力が反転すれば、温度検知用抵抗５４で決ま
る温度より検知温度が高いことを示す。出力が反
転しなければ、順次マイコン５１の端子CC，DD
を“Ｌ”にし、出力が反転した時の温度検知用抵
抗の設定温度にて現在温度とみなし、コンパレー
タ出力が反転した時のマイコン端子（“BB”か、
“CC”か、“DD”か）を記憶する。今、仮に
“BB”端子を“Ｌ”にすることによりコンパレ
ータ５７の出力が反転したとする。次に“AA”
端子を“Ｌ”にし、“BB”端子を“Ｌ”にすれ
ば、温度表示用LED６０が点灯する。以下、一
定周期にて前述の動作をくり返すが、一定周期内
の現在温度検知の時間（トランジスタ６４のオフ
期間）を短くし、温度表示の時間（トランジスタ
６４のオン期間）を長くすれば、見かけ上温度表
示用LEDは点灯している様に見える。以上のよ
うに、本発明の温度表示装置は切換手段７０を構
成するトランジスタ６４で現在温度検知と温度表
示を交互に切換えるようにしているので、ダイオ
ードを削減することができるものである。 First, the terminal AA of the microcomputer is set to “H” for a certain period of time.
When the temperature is set to 1, the transistor 64 is turned off, and no current flows through the temperature display LED, so no display is performed. At the same time, set the terminal “BB” of the microcomputer 51 to “L”.
(“CC” and “DD” are “H”), a voltage divided by the resistor 54 and the temperature sensing element 53 is applied to the terminal of the comparator 57 and compared with the voltage of the comparator 57. At that time, comparator 57
If the output is inverted, it indicates that the detected temperature is higher than the temperature determined by the temperature detection resistor 54. If the output is not inverted, the terminals CC and DD of the microcomputer 51 are
is set to "L", and the set temperature of the temperature detection resistor when the output is reversed is regarded as the current temperature, and the microcomputer terminal ("BB" or
(“CC” or “DD”). Now, suppose that the output of the comparator 57 is inverted by setting the "BB" terminal to "L". Next “AA”
When the terminal is set to "L" and the "BB" terminal is set to "L", the temperature display LED 60 lights up. Hereinafter, the above-mentioned operation is repeated at a constant cycle, but if the current temperature detection time (transistor 64 off period) within the constant cycle is shortened and the temperature display time (transistor 64 on period) is lengthened, The temperature display LED appears to be lit. As described above, in the temperature display device of the present invention, since the transistor 64 constituting the switching means 70 alternately switches between current temperature detection and temperature display, the number of diodes can be reduced.
発明の効果
以上のように本発明によれば、第２の切換手段
を用いることにより、従来のＮ個のダイオードが
削除でき部品点数も少なくなるし、ダイオードの
順方向電圧の温度変化分も無視でき正確な現在温
度が検知でき、その実用的効果は大なるものがあ
る。Effects of the Invention As described above, according to the present invention, by using the second switching means, the conventional N diodes can be removed, the number of parts can be reduced, and temperature changes in the forward voltage of the diodes can also be ignored. It is possible to accurately detect the current temperature, which has great practical effects.
第１図は従来の温度表示装置の回路図、第２図
は本発明の一実施例を示す温度表示装置の回路図
である。
５１……マイクロコンピユータ、５３……感温
素子、５４，５５，５６……温度検知用抵抗、６
０，６１，６２……温度表示用LED、５７……
コンパレータ、５２……直流電源。６７……現在
温度検知手段、６８……表示装置、６９……表示
手段、７０……切換手段。
FIG. 1 is a circuit diagram of a conventional temperature display device, and FIG. 2 is a circuit diagram of a temperature display device showing an embodiment of the present invention. 51... Microcomputer, 53... Temperature sensing element, 54, 55, 56... Temperature detection resistor, 6
0, 61, 62... LED for temperature display, 57...
Comparator, 52...DC power supply. 67...Current temperature detection means, 68...Display device, 69...Display means, 70...Switching means.
Claims (1)
直列に接続されたＮ個の抵抗と、そのＮ個の抵抗
を切換える第１の切換手段と、Ｎ段階の検知を行
う現在温度検知手段と、第１の切換手段に接続さ
れたＮ個の発光ダイオードで温度をＮ段階で表示
する温度表示手段と、前記温度表示手段と現在温
度検知手段を交互に切換える第２の切換手段とを
設けた温度制御装置。1. A temperature sensing element that detects temperature, N resistors connected in series to this temperature sensing element, first switching means that switches between the N resistances, and current temperature sensing means that performs N stages of detection. and a temperature display means for displaying the temperature in N stages using N light emitting diodes connected to the first switching means, and a second switching means for alternately switching between the temperature display means and the current temperature detection means. Temperature control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14462084A JPS6123931A (en) | 1984-07-12 | 1984-07-12 | temperature display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14462084A JPS6123931A (en) | 1984-07-12 | 1984-07-12 | temperature display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6123931A JPS6123931A (en) | 1986-02-01 |
| JPH0344646B2 true JPH0344646B2 (en) | 1991-07-08 |
Family
ID=15366268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14462084A Granted JPS6123931A (en) | 1984-07-12 | 1984-07-12 | temperature display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6123931A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454006B (en) * | 2012-06-05 | 2015-07-22 | 北大方正集团有限公司 | Temperature monitoring circuit for light-emitting diode |
-
1984
- 1984-07-12 JP JP14462084A patent/JPS6123931A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6123931A (en) | 1986-02-01 |
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