JPH0797050B2 - Temperature detection circuit - Google Patents
Temperature detection circuitInfo
- Publication number
- JPH0797050B2 JPH0797050B2 JP24867886A JP24867886A JPH0797050B2 JP H0797050 B2 JPH0797050 B2 JP H0797050B2 JP 24867886 A JP24867886 A JP 24867886A JP 24867886 A JP24867886 A JP 24867886A JP H0797050 B2 JPH0797050 B2 JP H0797050B2
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- resistor
- collector
- base
- thermistor
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 title claims description 7
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、検出温度によるサーミスタの抵抗値変化を、
出力信号の周波数変化に変換する温度検出回路に関する
ものである。TECHNICAL FIELD OF THE INVENTION The present invention relates to a change in resistance value of a thermistor depending on a detected temperature,
The present invention relates to a temperature detection circuit that converts a frequency change of an output signal.
従来の技術 近年、信号処理技術はアナログからディジタル化されて
きており、温度検出はサーミスタの抵抗値を利用し、そ
れを電圧または電流値のアナログ値で処理を行なってき
ている。以下図面を参照しながら、従来技術の一例につ
いて説明する。2. Description of the Related Art In recent years, signal processing technology has been digitized from analog, and temperature detection utilizes a resistance value of a thermistor and processes it with an analog value of a voltage or current value. An example of a conventional technique will be described below with reference to the drawings.
第３図が従来の一例で、第３図ａは電圧出力型を示す。FIG. 3 shows a conventional example, and FIG. 3a shows a voltage output type.
図中、抵抗19とサーミスタ３を直列に接続しておき、そ
の交点電圧をアンプ20により増幅して電圧出力信号27を
得る事により、後段で出力信号27の電圧値を利用するも
のである。第３図ｂは電流型で、抵抗21,サーミスタ3,
トランジスタ22,抵抗25が直列に接続されており、この
直列回路に流れる電流を抵抗23,トランジスタ24の電流
増幅手段で増幅して電流出力信号26を利用するものであ
る。In the figure, the resistor 19 and the thermistor 3 are connected in series, and the voltage at the intersection is amplified by the amplifier 20 to obtain the voltage output signal 27, so that the voltage value of the output signal 27 is used in the subsequent stage. FIG. 3b shows a current type, which includes a resistor 21, a thermistor 3,
The transistor 22 and the resistor 25 are connected in series, and the current output signal 26 is utilized by amplifying the current flowing in this series circuit by the current amplifying means of the resistor 23 and the transistor 24.
発明が解決しようとする問題点 しかしながら上記のような構成では、得られる出力がア
ナログ値であるが、最近の信号処理ではディジタル化が
図られているため、ディジタル処理のためには第４図に
示す様にアナログ値をディジタル値に変換するA/D変換
器29が必要であると言う問題点を有していた。Problems to be Solved by the Invention However, in the configuration as described above, although the obtained output is an analog value, the digitization is attempted in recent signal processing. As shown, there is a problem that the A / D converter 29 for converting an analog value into a digital value is necessary.
本発明は上記問題点に鑑み、温度変化のアナログ値を周
波数値に変換し、その周波数変化をディジタル化する事
により、従来例の様なA/D変換器を必要としない温度検
出回路を提供するものである。In view of the above problems, the present invention provides a temperature detection circuit that does not require an A / D converter like the conventional example by converting an analog value of temperature change into a frequency value and digitizing the frequency change. To do.
問題点を解決するための手段 上記問題点を解決するために本発明の温度検出回路は、
電源電圧ラインに接続された第１の抵抗の他端にサーミ
スタの一端を接続し、サーミスタの他端に第１のトラン
ジスタのエミッタを接続し、上記サーミスタに第２の抵
抗を並列に接続し、第１のトランジスタのベースとコレ
クタは接続され、その交点を第３の抵抗を介して接地
し、上記第１のトランジスタのベースとコレクタの交点
に第２のトランジスタのベースを接続し、第２のトラン
ジスタのエミッタは第４の抵抗を通して電源電圧ライン
に接続し、第２のトランジスタのコレクタには、第５の
抵抗と第１のコンデンサの直列回路をコンデンサ側が接
地されるように接続し、第５の抵抗と第１のコンデンサ
の交点に第６の抵抗を接続し、第６の抵抗の他端は、第
７の抵抗により接地し、第６の抵抗と第７の交点を第３
のトランジスタのベースに接続し、第３のトランジスタ
のコレクタは第８の抵抗により電源電圧ラインに接続さ
れ、第３のトランジスタのエミッタは接地され、第３の
トランジスタのコレクタに第９の抵抗を接続し、その他
端は第４のトランジスタのベースに接続し、第４のトラ
ンジスタのベースと接地間に第10の抵抗を接続し、第４
のトランジスタのエミッタを第２のトランジスタのコレ
クタに接続したと言う構成を備えたものである。Means for Solving the Problems In order to solve the above problems, the temperature detection circuit of the present invention is
One end of the thermistor is connected to the other end of the first resistor connected to the power supply voltage line, the emitter of the first transistor is connected to the other end of the thermistor, and the second resistor is connected in parallel to the thermistor. The base and collector of the first transistor are connected, the intersection is grounded through a third resistor, the base of the second transistor is connected to the intersection of the base and collector of the first transistor, and the second The emitter of the transistor is connected to the power supply voltage line through the fourth resistor, and the collector of the second transistor is connected to the series circuit of the fifth resistor and the first capacitor such that the capacitor side is grounded. A sixth resistor is connected to the intersection of the first resistor and the first resistor, the other end of the sixth resistor is grounded by the seventh resistor, and the sixth resistor and the seventh intersection are connected to the third resistor.
Connected to the base of the transistor, the collector of the third transistor is connected to the power supply voltage line by the eighth resistor, the emitter of the third transistor is grounded, and the ninth resistor is connected to the collector of the third transistor. The other end is connected to the base of the fourth transistor, and the tenth resistor is connected between the base of the fourth transistor and the ground.
The configuration is such that the emitter of the transistor is connected to the collector of the second transistor.
作用 本発明は上記した構成によって、温度検出値を周波数変
化に変換する為に、従来の様にA/D変換器を用いる事な
く、ディジタル化温度検出が得られる事となる。Action The present invention, by the above-mentioned configuration, converts the detected temperature value into a frequency change, and thus digitized temperature detection can be obtained without using an A / D converter as in the conventional case.
実施例 以下本発明の一実施例の温度検出回路について、図面を
参照しながら説明する。Embodiment A temperature detecting circuit according to an embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の一実施例における温度検出回路を示す
ものである。抵抗2,抵抗4,サーミスタ3,トランジスタ5,
抵抗６で構成されるのが測温用抵抗分圧回路で、サーミ
スタ３によって検出温度に対応した出力電圧がトランジ
スタ５と抵抗６によって得られ、これが、トランジスタ
８のベースに入力されている為サーミスタ３の検出温度
に対応した電流がトランジスタ８のコレクタに発生す
る。そしてその電流は、抵抗９を通してコンデンサ11を
充電する。なお、トランジスタ５とトランジスタ８はペ
アトランジスタを用いる事により温度特性の補償が行な
える。FIG. 1 shows a temperature detecting circuit according to an embodiment of the present invention. Resistor 2, resistor 4, thermistor 3, transistor 5,
The resistance voltage dividing circuit for temperature measurement is composed of the resistor 6, and the output voltage corresponding to the detected temperature is obtained by the thermistor 3 by the transistor 5 and the resistor 6, and this is input to the base of the transistor 8, so the thermistor A current corresponding to the detected temperature of 3 is generated in the collector of the transistor 8. The current then charges the capacitor 11 through the resistor 9. The temperature characteristics can be compensated by using a pair of transistors for the transistors 5 and 8.
以上の様な状態で、トランジスタ８のコレクタからコレ
クタ電流が流れだすと、抵抗９を通してコンデンサ11が
充電される。この様子を第２図ａに示す。ここで温度が
T0℃であった時、トランジスタ８のコレクタ電流がI0で
あったとすれば、コンデンサ11はその端子電圧が で表わされるように充電される。上記の電圧は抵抗10と
抵抗12によりトランジスタ14のベースに入力されている
為、抵抗10と抵抗12の交点電圧をＶとすれば （ここでR6は抵抗10の値,R7は抵抗12の値を示す）で与
えられる為、トランジスタ14のベース−エミッタ電圧を
VBE3とすれば、VC−VBE3＞０でトランジスタ14はオンす
る。よってトランジスタ14のコレクタ電圧は高レベル→
低レベルに変化する。トランジスタ14のコレクタは抵抗
15と抵抗16を通してトランジスタ17のベースに接続され
ている為、トランジスタ17のベース電圧も高レベル→低
レベルに変化する。よってトランジスタ17はオンする。
この結果、トランジスタ17のコレクタに電流が流れる
為、抵抗９を通してコンデンサ11の充電電荷は放電され
る。こうしてコンデンサ11の端子電圧が下がる為にトラ
ンジスタ14はオフされる。よって、トランジスタ14のコ
レクタ電圧はLo→Hiに変化し、トランジスタ17がオフす
る為、再びコンデンサ11は充電を開始する。以上によ
り、温度に対応したトランジスタ８のコレクタ電流I0の
値によりコンデンサ11の充電・放電の期間が制御される
為にトランジスタ14のコレクタ電圧は、第２図ｂの様に
変化する。よって温度に対応した上記のコレクタ電流I0
の値が変化すれば、トランジスタ14のコレクタ電圧、つ
まる所、周波数変化出力28が得られる。When a collector current starts to flow from the collector of the transistor 8 in the above state, the capacitor 11 is charged through the resistor 9. This is shown in FIG. 2a. Where the temperature is
If the collector current of the transistor 8 is I 0 at T 0 ° C, the terminal voltage of the capacitor 11 is It is charged as represented by. Since the above voltage is input to the base of the transistor 14 through the resistors 10 and 12, if the intersection voltage of the resistors 10 and 12 is V (Where R6 is the value of resistor 10 and R7 is the value of resistor 12), so the base-emitter voltage of transistor 14 is
Assuming V BE3 , the transistor 14 is turned on when V C −V BE3 > 0. Therefore, the collector voltage of the transistor 14 is high level →
Change to low level. The collector of transistor 14 is a resistor
Since it is connected to the base of the transistor 17 through the resistor 15 and the resistor 16, the base voltage of the transistor 17 also changes from high level to low level. Therefore, the transistor 17 is turned on.
As a result, a current flows through the collector of the transistor 17, so that the charge stored in the capacitor 11 is discharged through the resistor 9. In this way, the terminal voltage of the capacitor 11 drops, so that the transistor 14 is turned off. Therefore, the collector voltage of the transistor 14 changes from Lo to Hi, the transistor 17 is turned off, and the capacitor 11 starts charging again. As described above, since the charging / discharging period of the capacitor 11 is controlled by the value of the collector current I 0 of the transistor 8 corresponding to the temperature, the collector voltage of the transistor 14 changes as shown in FIG. 2b. Therefore, the collector current I 0 corresponding to the temperature
If the value of is changed, the collector voltage of transistor 14, at the end, the frequency change output 28 is obtained.
発明の効果 以上のように本発明は、温度変化を周波数変化として取
りだせる為、ディジタル信号処理の演算を行なう場合に
周波数変化出力をカウンタで計数する事により温度変化
をディジタル値に変換できる為にA/D変換器を必要とし
ない、又、本構成は簡単であり、サーミスタとコンデン
サを除けば、IC化するのに適した構成である為、温度変
化データの必要な部分に本回路を付けておく事により、
周波数変化出力をディジタル値で扱い、温度補正を行な
う場合に、大巾なコストアップ（A/D変換器を必要とし
ない）を招かなくても、温度補正が行なえるという利点
を有する。As described above, according to the present invention, since the temperature change can be taken out as the frequency change, the temperature change can be converted into the digital value by counting the frequency change output by the counter when the calculation of the digital signal processing is performed. This circuit does not require an A / D converter, and this configuration is simple. Since it is a configuration suitable for making into an IC except the thermistor and a capacitor, this circuit is attached to the part where the temperature change data is required. By keeping
When the frequency change output is treated as a digital value and the temperature is corrected, there is an advantage that the temperature can be corrected without causing a large increase in cost (which does not require an A / D converter).
第１図は本発明の一実施例における温度検出回路の回路
図、第２図は本発明の一実施例の回路におけるタイムチ
ャート、第３図a,b,第４図はおのおの従来例の回路図で
ある。 １……電源電圧ライン、2,4,6,7,9,10,12,13,15,16……
抵抗、３……サーミスタ、5,8,14,17……トランジス
タ、11……コンデンサ。FIG. 1 is a circuit diagram of a temperature detecting circuit in one embodiment of the present invention, FIG. 2 is a time chart in the circuit of one embodiment of the present invention, and FIGS. 3a, 3b and 4 are circuits of respective conventional examples. It is a figure. 1 …… Power supply voltage line, 2,4,6,7,9,10,12,13,15,16 ……
Resistor, 3 …… thermistor, 5,8,14,17 …… transistor, 11 …… capacitor.
Claims (1)
他端にサーミスタの一端を接続し、そのサーミスタの他
端に第１のトランジスタのエミッタを接続し、上記サー
ミスタに第２の抵抗を並列に接続し、第１のトランジス
タのベースとコレクタは接続され、その交点を第３の抵
抗を介して接地し、上記第１のトランジスタのベースと
コレクタの交点に第２のトランジスタのベースを接続
し、第２のトランジスタのエミッタは第４の抵抗を介し
て電源電圧ラインに接続し、第２のトランジスタのコレ
クタには第５の抵抗と第１のコンデンサの直列回路をコ
ンデンサ側が接地されるように接続し、第５の抵抗と第
１のコンデンサの交点に第６の抵抗を接続し、第６の抵
抗の他端は第７の抵抗により接地し、第６の抵抗と第７
の交点を第３のトランジスタのベースに接続し、第３の
トランジスタのコレクタは第８の抵抗により電源電圧ラ
インに接続され、第３のトランジスタのエミッタは接地
され、かつ第３のトランジスタのコレクタに第９の抵抗
を接続し、その他端は第４のトランジスタのベースに接
続し、第４のトランジスタのベースと接地間に第10の抵
抗を接続し、第４のトランジスタのエミッタを第２のト
ランジスタのコレクタに接続した温度検出回路。1. A first resistor connected to a power supply voltage line has one end of a thermistor connected to the other end thereof, the other end of the thermistor having an emitter of a first transistor connected thereto, and the thermistor having a second resistor connected thereto. Are connected in parallel, the base and collector of the first transistor are connected, the intersection is grounded through a third resistor, and the base of the second transistor is connected to the intersection of the base and collector of the first transistor. Connected, the emitter of the second transistor is connected to the power supply voltage line through the fourth resistor, and the collector of the second transistor has a series circuit of the fifth resistor and the first capacitor grounded on the capacitor side. So that the sixth resistor is connected to the intersection of the fifth resistor and the first capacitor, the other end of the sixth resistor is grounded by the seventh resistor, and the sixth resistor and the seventh resistor are connected together.
Is connected to the base of the third transistor, the collector of the third transistor is connected to the power supply voltage line by the eighth resistor, the emitter of the third transistor is grounded, and the collector of the third transistor is The ninth resistor is connected, the other end is connected to the base of the fourth transistor, the tenth resistor is connected between the base of the fourth transistor and the ground, and the emitter of the fourth transistor is connected to the second transistor. Temperature detection circuit connected to the collector of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24867886A JPH0797050B2 (en) | 1986-10-20 | 1986-10-20 | Temperature detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24867886A JPH0797050B2 (en) | 1986-10-20 | 1986-10-20 | Temperature detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63101723A JPS63101723A (en) | 1988-05-06 |
| JPH0797050B2 true JPH0797050B2 (en) | 1995-10-18 |
Family
ID=17181705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24867886A Expired - Lifetime JPH0797050B2 (en) | 1986-10-20 | 1986-10-20 | Temperature detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0797050B2 (en) |
-
1986
- 1986-10-20 JP JP24867886A patent/JPH0797050B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63101723A (en) | 1988-05-06 |
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