JPH01287716A - Temperature control circuit - Google Patents
Temperature control circuitInfo
- Publication number
- JPH01287716A JPH01287716A JP11722288A JP11722288A JPH01287716A JP H01287716 A JPH01287716 A JP H01287716A JP 11722288 A JP11722288 A JP 11722288A JP 11722288 A JP11722288 A JP 11722288A JP H01287716 A JPH01287716 A JP H01287716A
- Authority
- JP
- Japan
- Prior art keywords
- temperature setting
- optical coupling
- light emitting
- emitting diode
- light receiving
- 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
Links
- 230000008878 coupling Effects 0.000 claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 230000007547 defect Effects 0.000 abstract 1
- 230000002950 deficient Effects 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は光結合素子を用いた温度制御回路に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature control circuit using a photocoupler.
従来の技術
従来の光結合素子を用いた温度制御回路を第２図に示す
。１は商用電源であシ、２は電源スィッチである。ダイ
オード３により整流した後、降圧用抵抗４によね降圧し
、コンデンサ５により平滑して直流電源を作っている。2. Description of the Related Art A temperature control circuit using a conventional optical coupling device is shown in FIG. 1 is a commercial power source, and 2 is a power switch. After being rectified by a diode 3, the voltage is stepped down by a step-down resistor 4, and smoothed by a capacitor 5 to create a DC power source.
温度を検知するサーミスタ６１と抵抗６２により温度検
出回路６を構成し、抵抗７１と７３と可変抵抗器７２と
光結合素子の受光素子１４−２によシ温度設定回路７を
構成する。電圧比較器８により温度検出回路６からの温
度信号電圧Ｖｔ と温度設定電圧ＶＲを比較する。設
定温度に達するまではＶＲ＞ Ｖｔとなり電圧比較器８
の出力が１−１１となシトランジスタ１１がＯＮし、リ
レー１０が作動してリレー接点１０−１が閉じ、ヒータ
２３に通電する。温度が上昇すると、サーミスタ６１の
抵抗値が低下し、（温度設定電圧ＶＲ） ＜ （温度信
号電圧Ｖｔ ） となり電圧比較器８の出力がＬｏ
となり、リレー１ｏが非作動となる。ダイオード９はリ
レー１０の逆起電力防止用である。タイマー２２がＯＮ
すると前記タイマー出力がり。A temperature detecting circuit 6 is constituted by a thermistor 61 that detects temperature and a resistor 62, and a temperature setting circuit 7 is constituted by resistors 71 and 73, a variable resistor 72, and a light receiving element 14-2 which is an optical coupling element. A voltage comparator 8 compares the temperature signal voltage Vt from the temperature detection circuit 6 with the temperature setting voltage VR. Until the set temperature is reached, VR > Vt and voltage comparator 8
When the output becomes 1-11, the transistor 11 is turned on, the relay 10 is activated, the relay contact 10-1 is closed, and the heater 23 is energized. When the temperature rises, the resistance value of the thermistor 61 decreases, and (temperature setting voltage VR) < (temperature signal voltage Vt), and the output of the voltage comparator 8 becomes Lo.
Therefore, relay 1o becomes inactive. The diode 9 is for preventing back electromotive force of the relay 10. Timer 22 is ON
Then the timer output increases.
となり、トランジスタ２０，１６．２７がＯＦＦして、
発光ダイオード１３、光結合素子の発光素子１４−１が
ＯＮし、タイマー動作中にタイマー作動表示すると共に
温度設定回路７の可変抵抗器７２の両端を光結合素子の
受光素子１４−２で短絡することにより温度設定を強に
する。１５は定電圧ダイオード、１８は制御回路である
。Then, transistors 20, 16, and 27 are turned off,
The light emitting diode 13 and the light emitting element 14-1 of the optical coupling element are turned on, and while the timer is operating, the timer operation is displayed and both ends of the variable resistor 72 of the temperature setting circuit 7 are shorted by the light receiving element 14-2 of the optical coupling element. This will increase the temperature setting. 15 is a constant voltage diode, and 18 is a control circuit.
発明が解決しようとする課題
このような従来回路では、発光ダイオード１３、発光素
子１４−１を電源に対して並列に駆動している為、降圧
用抵抗４に於ける損失が大きく、発熱が大となる。又、
トランジスタ１６，２５゜２７、抵抗１２，１７，１９
，２４，２５，２６、発光ダイオード１３、光結合素子
の発光素子１４−１のどれか１ケが不良となると発光ダ
イオード１３の強温度設定表示と温度設定が合わないと
云う不都合が生じていた。又、部品点数も多くコスト的
にも高くつくと云う欠点があった。Problems to be Solved by the Invention In such a conventional circuit, since the light emitting diode 13 and the light emitting element 14-1 are driven in parallel to the power supply, the loss in the step-down resistor 4 is large and heat generation is large. becomes. or,
Transistor 16, 25° 27, resistor 12, 17, 19
, 24, 25, 26, if any one of the light emitting diode 13 and the light emitting element 14-1 of the optical coupling element becomes defective, there is an inconvenience that the strong temperature setting display of the light emitting diode 13 and the temperature setting do not match. . Further, there is a drawback that the number of parts is large and the cost is high.
本発明は上記課題を解決し、温度設定の表示と温度設定
を常に一致する温度制御回路を提供するものである。The present invention solves the above problems and provides a temperature control circuit that always matches the temperature setting display and the temperature setting.
課題を解決するだめの手段
本発明は上記課題を解決するため、発光ダイオードと直
列に光結合素子の発光素子を接続し、この直列接続した
両端にスイッチング素子を接続し、前記光結合素子の受
光素子を温度設定回路の可変抵抗器両端に接続する。Means for Solving the Problems In order to solve the above problems, the present invention connects a light emitting element of an optical coupling element in series with a light emitting diode, and connects a switching element to both ends of the series connection, so that the light receiving element of the optical coupling element Connect the element across the variable resistor of the temperature setting circuit.
作 用
本発明は上記した構成により、降圧用抵抗の発熱を小さ
くすると共に、部品不良時に於いても強温度設定表示と
温度設定を常に合せ、部品点数を削減できる。Effects of the Invention With the above-described configuration, the present invention can reduce the heat generation of the step-down resistor, always match the strong temperature setting display with the temperature setting even when a component is defective, and reduce the number of parts.
実施例
以下、本発明の一実施例を示す温度制御回路を説明する
。第１図において、第２図と同−付号のものは同一構成
要素で、その詳細な説明は省略する。EXAMPLE A temperature control circuit showing an example of the present invention will be described below. In FIG. 1, components with the same numbers as those in FIG. 2 are the same components, and detailed explanation thereof will be omitted.
温度設定回路の可変抵抗器７２が中温度位置に設定され
ている時、タイマー２２をＯＮにするとタイマー出力が
Ｌｏとなりトランジスタ２０゜１６が０ＦＦＩ、て発光
ダイオード１３、光結合素子１４−１が点灯し、発光ダ
イオード１３により可変抵抗器７２が中温度位置に設定
されているにもかかわらず強温度設定であることを表示
する。When the variable resistor 72 of the temperature setting circuit is set to the medium temperature position, when the timer 22 is turned on, the timer output becomes Lo, the transistor 20°16 becomes 0FFI, and the light emitting diode 13 and the optical coupling element 14-1 light up. However, the light emitting diode 13 indicates that the high temperature setting is set even though the variable resistor 72 is set to the medium temperature position.
又、光結合素子の受光素子１４−２により可変抵抗器７
２０両端を短絡し、可変抵抗器７２の設定位置にかかわ
りなく強温度設定とする。トランジスタ２０，１６、或
は抵抗１２，１７，１９゜２１、或は発光ダイオード１
３、光結合素子の発光素子１４−１がどれか不良である
場合は発光ダイオード１３と光結合素子の発光素子１４
−１がどちらの発光するか、しないか、同一状態となり
、故障状態においても温度設定の表示と温度設定が一致
する。又、発光ダイオード１３と光結合素子の発光素子
１４−１を直列に接続しているので従来例の如くそれぞ
れに別ルートで電流を流す場合に比較して約半分の電流
でよい。In addition, the variable resistor 7 is connected to the light receiving element 14-2 of the optical coupling element.
20 are short-circuited to set a strong temperature regardless of the setting position of the variable resistor 72. Transistors 20, 16, or resistors 12, 17, 19° 21, or light emitting diode 1
3. If any of the light emitting elements 14-1 of the optical coupling element is defective, the light emitting diode 13 and the light emitting element 14 of the optical coupling element
-1 indicates whether the light is emitted or not, and the state is the same, and the display of the temperature setting and the temperature setting match even in a failure state. Furthermore, since the light emitting diode 13 and the light emitting element 14-1 of the optical coupling element are connected in series, the current required is approximately half that of the case where current is passed through separate routes for each as in the conventional example.
発明の効果
以上述べてきたように、本発明によれば、きわめて簡易
な回路構成で降圧用抵抗の発熱を小さくすると共に、故
障状態においても温度設定の表示と温度設定を常に一致
させているので故障時にはすぐにわかり使用者に不安感
をいだかせないものであり、部品点数も少なく実用的に
きわめて有用である。Effects of the Invention As described above, according to the present invention, the heat generation of the step-down resistor is reduced with an extremely simple circuit configuration, and the display of the temperature setting always matches the temperature setting even in a failure state. In the event of a failure, it can be easily detected without causing any anxiety to the user, and the number of parts is small, making it extremely useful in practice.
第１図は本発明の一実施例の温度制御回路を示す回路図
、第２図は従来の温度制御回路を示す回路図である。
１３・・・・・・発光ダイオード、１４−１・・・・・
・光結合素子の発光素子、１６・・・・・・トランジス
タ、１４−２・・・・・・光結合素子の受光素子、７・
・・・・・温度設定回路、７２・・・・・・可変抵抗器
。FIG. 1 is a circuit diagram showing a temperature control circuit according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional temperature control circuit. 13... Light emitting diode, 14-1...
- Light emitting element of the optical coupling device, 16...Transistor, 14-2... Light receiving element of the optical coupling device, 7.
...Temperature setting circuit, 72...Variable resistor.
Claims (1)
、この直列接続した両端にスイッチング素子を接続し、
前記光結合素子の受光素子を温度設定回路の可変抵抗器
両端に接続したことを特徴とする温度制御回路。A light emitting element of an optical coupling element is connected in series with a light emitting diode, and a switching element is connected to both ends of this series connection.
A temperature control circuit characterized in that a light receiving element of the optical coupling element is connected to both ends of a variable resistor of a temperature setting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11722288A JPH0810413B2 (en) | 1988-05-13 | 1988-05-13 | Temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11722288A JPH0810413B2 (en) | 1988-05-13 | 1988-05-13 | Temperature control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01287716A true JPH01287716A (en) | 1989-11-20 |
| JPH0810413B2 JPH0810413B2 (en) | 1996-01-31 |
Family
ID=14706418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11722288A Expired - Lifetime JPH0810413B2 (en) | 1988-05-13 | 1988-05-13 | Temperature control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0810413B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994017254A1 (en) * | 1993-01-21 | 1994-08-04 | A.J. Leisure Group Ltd. | Electronically operated controller with fiber optic interface |
-
1988
- 1988-05-13 JP JP11722288A patent/JPH0810413B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994017254A1 (en) * | 1993-01-21 | 1994-08-04 | A.J. Leisure Group Ltd. | Electronically operated controller with fiber optic interface |
| US5410150A (en) * | 1993-01-21 | 1995-04-25 | A. J. Leisure Group Ltd. | Fiber optic controller with an interface having an emitting diode and a photodetector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0810413B2 (en) | 1996-01-31 |
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