JPH0311576A - Temperature control device - Google Patents
Temperature control deviceInfo
- Publication number
- JPH0311576A JPH0311576A JP1145916A JP14591689A JPH0311576A JP H0311576 A JPH0311576 A JP H0311576A JP 1145916 A JP1145916 A JP 1145916A JP 14591689 A JP14591689 A JP 14591689A JP H0311576 A JPH0311576 A JP H0311576A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- circuit
- voltage
- temperature setting
- relay
- 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
Landscapes
- Control Of Resistance Heating (AREA)
- Control Of Temperature (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電気カーペット等のリレーを制御する電気暖
房器具に於ける温度制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a temperature control device for an electric heating appliance, such as an electric carpet, which controls a relay.
従来の技術
従来のこの種の温度制御装置は、第３図、第４図に示す
ように、ヒータ１の温度を熱的に結合した温度検出回路
２の温度センサ３で検出し、温度検出回路２は直流電圧
に変換した信号■、を出力する。信号■、は比較回路４
に入力され、ヒータ１の温度が高いほど高い電圧値を示
す。比較回路４の他の入力端子には、温度設定回路５の
信号■。2. Description of the Related Art As shown in FIGS. 3 and 4, a conventional temperature control device of this type detects the temperature of a heater 1 with a temperature sensor 3 of a temperature detection circuit 2 that is thermally coupled to the temperature detection circuit 2. 2 outputs a signal (2) converted into a DC voltage. Signal ■, is comparison circuit 4
, and the higher the temperature of the heater 1, the higher the voltage value. The other input terminal of the comparator circuit 4 is the signal ■ of the temperature setting circuit 5.
が入力され、■５の設定によりヒータ１の温度が決まる
。ヒータ１の温度が高い時には、Ｖ、＞Ｖ。is input, and the temperature of the heater 1 is determined by the setting of 5. When the temperature of heater 1 is high, V,>V.
であるため比較回路４の出力はり。であり、リレー駆動
回路６のトランジスタ７がオフ、リレー８もオフである
。そして、ヒータ１の温度が下がり、Ｖア〈ｖｓとなる
と比較回路４の出力がＨ４となり、トランジスタ７、リ
レー８がオンしてヒータ１へ通電するようになっている
。また、比較回路４の出力により駆動するヒス回路９に
よって温度設定電圧■、の設定を変化してリレー８のチ
ャタリング等を防止している。さらに、比較回路４等へ
供給する直流電圧は直流電源回路１０から発生するよう
になっている。Therefore, the output of comparator circuit 4 is high. The transistor 7 of the relay drive circuit 6 is off, and the relay 8 is also off. Then, when the temperature of the heater 1 decreases and becomes VA<vs, the output of the comparator circuit 4 becomes H4, and the transistor 7 and relay 8 are turned on to energize the heater 1. Further, a hysteresis circuit 9 driven by the output of the comparator circuit 4 changes the setting of the temperature setting voltage (2) to prevent chattering of the relay 8, etc. Further, the DC voltage supplied to the comparator circuit 4 and the like is generated from the DC power supply circuit 10.
発明が解決しようとする課題
しかしながら上記のような構成では、温度信号電圧■７
、温度設定電圧■、には交流電源ｖＡｃに同期したリン
プル電圧があり、第４図では、温度設定電圧■、のリッ
プル電圧は非常に小さいものとして説明している。第４
図において、リレー８がオンする時には、第１のＯＮ点
のように温度信号電圧ｖＴの最小部で温度設定電圧■５
と接触、また、リレー８がオフする時には、第１のＯＦ
Ｆ点のように温度信号電圧ＶＴの最大部で温度設定電圧
Ｖ、と接触し、その時点でリレー８がオン、または、オ
フすることになる。すなわち、リレー８がオン、オフす
る点は交流電源■１に同期し、リレー８の接点は常に同
じ位相でオン、または、オフして接点寿命が短いという
課題を有していた。Problems to be Solved by the Invention However, in the above configuration, the temperature signal voltage ■7
, temperature setting voltage (2) have a ripple voltage synchronized with the AC power supply vAc, and in FIG. 4, the ripple voltage of temperature setting voltage (2) is described as being extremely small. Fourth
In the figure, when the relay 8 is turned on, the temperature setting voltage ■5 is at the minimum part of the temperature signal voltage vT like the first ON point.
Also, when the relay 8 is turned off, the first OF
At point F, the temperature setting voltage V is contacted at the maximum temperature signal voltage VT, and the relay 8 is turned on or off at that point. That is, the point at which the relay 8 turns on and off is synchronized with the AC power source (1), and the contacts of the relay 8 always turn on and off in the same phase, resulting in a short contact life.
本発明はかかる従来の課題を解消するもので、リレーの
接点寿命を長くすることを目的とする。The present invention solves such conventional problems and aims to extend the life of the contacts of the relay.
課題を解決するだめの手段
上記課題を解決するために本発明の温度制御装置は、温
度設定回路の温度設定電圧■、又は、温度検出回路の温
度信号電圧■アに交流電源と異なる周波数の信号を重畳
する重畳信号発生回路を備えたものである。Means for Solving the Problems In order to solve the above problems, the temperature control device of the present invention provides a temperature setting voltage of the temperature setting circuit or a temperature signal voltage of the temperature detection circuit. It is equipped with a superimposed signal generation circuit that superimposes the .
作用
本発明は上記した構成によって、温度信号電圧Ｖ、と温
度設定電圧■３が接触する点が交流電源に同期したリッ
プル電圧の最小側、または、最大側に固定しないで、交
流電源と非同期の信号によってランダムとなり、従って
、リレー接点のオン、オフ位相もランダムとなり、接点
寿命が長くなるものである。Effect of the present invention With the above-described configuration, the point of contact between the temperature signal voltage V and the temperature setting voltage (3) is not fixed at the minimum or maximum side of the ripple voltage synchronized with the AC power supply, but is set asynchronously with the AC power supply. It becomes random depending on the signal, so the on/off phase of the relay contact also becomes random, and the life of the contact becomes longer.
実施例
以下、本発明の一実施例を添付図面に基づいて説明する
。第１図、第２図において、１１は交流電源、１２はヒ
ータ、１３は温度検出回路で、ヒータ１２と熱的に結合
した温度センサ１４、抵抗１５、Ｉ６、ダイオード１７
、コンデンサ１８で構成し、直流電圧に変換した温度信
号電圧■１を出力する。１９は温度設定回路で、ダイオ
ード２０、抵抗２１．２２、ボリューム２３、コンデン
サ２４で温度設定電圧Ｖｓを出力する。さらに温度設定
電圧■８は、重畳信号発生回路２５、ヒス回路２６によ
って変化する。重畳信号発止回路２５は抵抗２７．２８
．２９、インハーク３０．３１、コンデンサ３２、トラ
ンジスタ３３で構成し、その発振周波数は交流電源と異
なるものである。また、ヒス回路２６は抵抗３４．３５
．３６、トランジスタ３７．３８で構成し、リレーのチ
ャタリング等を防止する回路である。３９は温度信号電
圧■１、温度設定電圧■、を比較する回路、４０は比較
回路３９の信号でヒータ１２への通電をオン、オフする
リレー駆動回路でダイオード４１．４２、抵抗４３、リ
レー４４、トランジスタ４５、コンデンサ４６で構成す
る。４７は比較回路３９等へ直流電圧を供給する直流電
源回路でダイオード４８、抵抗４９、コンデンサ５０、
定電圧ダイオード５１で構成する。EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. In FIGS. 1 and 2, 11 is an AC power supply, 12 is a heater, and 13 is a temperature detection circuit, which includes a temperature sensor 14 thermally coupled to the heater 12, a resistor 15, an I6, and a diode 17.
, a capacitor 18, and outputs a temperature signal voltage (1) converted into a DC voltage. 19 is a temperature setting circuit which outputs a temperature setting voltage Vs using a diode 20, resistors 21, 22, a volume 23, and a capacitor 24. Furthermore, the temperature setting voltage (8) is changed by the superimposed signal generation circuit 25 and the hysteresis circuit 26. The superimposed signal generation circuit 25 is a resistor 27.28
．． 29, Inharc 30, 31, a capacitor 32, and a transistor 33, and its oscillation frequency is different from that of an AC power supply. Also, the hysteresis circuit 26 has a resistor of 34.35
．． 36 and transistors 37 and 38, this is a circuit that prevents relay chattering and the like. 39 is a circuit that compares the temperature signal voltage (1) and the temperature setting voltage (2); 40 is a relay drive circuit that turns on and off electricity to the heater 12 based on the signal from the comparison circuit 39; diodes 41, 42, a resistor 43, and a relay 44; , a transistor 45, and a capacitor 46. 47 is a DC power supply circuit that supplies DC voltage to the comparator circuit 39, etc., and includes a diode 48, a resistor 49, a capacitor 50,
It is composed of a constant voltage diode 51.
上記構成において、ヒータ１２の温度を熱的に結合した
温度検出回路１３の温度センサ１４で検出し、温度検出
回路１３は直流電圧に変換した温度信号電圧■１を出力
する。温度信号電圧■、は、ヒータ１２の温度が高いほ
ど温度センサ１４のインピーダンスが小さくなるので高
い電圧値を示す。ヒータ１２の温度を所定の温度に設定
するのは温度設定回路１９で、その出力である温度設定
電圧Ｖ、を出力する。温度設定電圧■、は、インバータ
発振回路で構成した重畳信号発生回路２５の出力■、ｌ
により抵抗２９がボリューム２３に並列接続されたり、
されなかったりするので重畳信号発生回路２５の周波数
に応じて変化することになる。重畳信号発生回路２５の
周波数は交流電源に非同期であり、また、重畳信号発生
回路２５の出力Ｖ、ｌによる温度設定電圧Ｖ。In the above configuration, the temperature of the heater 12 is detected by the temperature sensor 14 of the thermally coupled temperature detection circuit 13, and the temperature detection circuit 13 outputs a temperature signal voltage (1) converted into a DC voltage. The temperature signal voltage (2) shows a high voltage value because the impedance of the temperature sensor 14 becomes smaller as the temperature of the heater 12 becomes higher. A temperature setting circuit 19 sets the temperature of the heater 12 to a predetermined temperature, and outputs a temperature setting voltage V as its output. The temperature setting voltage ■, is the output ■, l of the superimposed signal generation circuit 25 composed of an inverter oscillation circuit.
The resistor 29 is connected in parallel to the volume 23,
Therefore, the frequency changes depending on the frequency of the superimposed signal generation circuit 25. The frequency of the superimposed signal generation circuit 25 is asynchronous to the AC power supply, and the temperature setting voltage V is determined by the outputs V and l of the superposition signal generation circuit 25.
の変化中は温度信号電圧■７のリップル電圧よりも大き
く設定している。比較回路３９は温度信号電圧■７、温
度設定電圧■３を入力として、ヒータ１２の温度が設定
よりも高い時、すなわち、Ｖ、＞■、の時はＬｏ比出力
ヒータ１２の温度が設定よりも低い時、すなわち、ＶＴ
＜ＶＳの時はＨｉ比出力なりリレー駆動回路４０を制
御し、ヒータ１２を通電制御する。第２図において、第
１のＯＮ点のように、Ｖ、＞Ｖ８のリレー４４オフから
、ヒータ１２の温度が低下してリレー４４オンへ移行す
る時を見ると温度設定電圧■５に交流電源１１と非同期
の信号を重畳しているので温度信号電圧■、の最小部だ
けで接触することがなく、次のＯＮ点である第２のＯＮ
点では、さらに異なる位相でリレー４４がオンすること
になる。このことはリレー４４がオフする時でも同様で
ある。以上のようにリレー４４がオン、オフする点では
交流電源１１と非同期となり、リレー４４の接点の開閉
位相も交流型ａ１１と非同期となるものである。尚、実
施例においては、温度設定回路１９に重畳信号発生回路
２５を設けて説明したが、重畳信号発生回路２５を温度
検出回路１３側に設けても同様の動作で同様の効果を得
るものである。While the temperature signal voltage is changing, the temperature signal voltage is set to be larger than the ripple voltage of 7. The comparator circuit 39 inputs the temperature signal voltage ■7 and the temperature setting voltage ■3, and when the temperature of the heater 12 is higher than the setting, that is, when V>■, the temperature of the Lo ratio output heater 12 is higher than the setting. When VT is also low, that is, VT
When <VS, it becomes a Hi ratio output, and the relay drive circuit 40 is controlled, and the heater 12 is energized. In Fig. 2, as shown in the first ON point, when the temperature of the heater 12 decreases and the relay 44 turns on from V, > V8, the AC power supply changes to the temperature setting voltage 5. Since the asynchronous signal with 11 is superimposed, there is no contact only at the minimum part of the temperature signal voltage ■, and the second ON point, which is the next ON point,
At this point, the relay 44 is turned on in a further different phase. This also applies when the relay 44 is turned off. As described above, the relay 44 is turned on and off asynchronously with the AC power source 11, and the opening/closing phase of the contacts of the relay 44 is also asynchronous with the AC type a11. In the embodiment, the superimposed signal generating circuit 25 is provided in the temperature setting circuit 19, but the same effect can be obtained with the same operation even if the superimposed signal generating circuit 25 is provided on the temperature detecting circuit 13 side. be.
発明の効果
以上のように本発明の温度制御装置によれば次の効果が
得られる。Effects of the Invention As described above, the temperature control device of the present invention provides the following effects.
温度信号電圧■、と温度設定電圧Ｖ、が接触する点が交
流電源と非同期となるため、ヒータへ通電制御するリレ
ー接点のオン、オフ位相も交流電源と非同期となり、リ
レー接点が溶着するまでの時間、すなわち、開閉寿命が
長くなり、長期間、信頬性の高い温度制御装置を得るこ
とができる。Since the point where the temperature signal voltage ■ and the temperature setting voltage V come into contact is asynchronous with the AC power supply, the on/off phase of the relay contact that controls energization of the heater is also asynchronous with the AC power supply, and the contact point between the temperature signal voltage ■ and the temperature setting voltage V is asynchronous with the AC power supply. The time, that is, the opening/closing life is increased, and a temperature control device with high reliability for a long period of time can be obtained.
第１図は本発明の一実施例における温度制御装置の回路
図、第２図は同温度制御装置の動作説明図、第３図は従
来の温度制御装置の回路図、第４図は同温度制御装置の
動作説明図である。
１１・・・・・・交流電源、１２・・・・・化−タ、１
３・・・・・・温度検出回路、１９・・・・・・温度設
定回路、２５・・・・・・重畳信号発生回路、３９・・
・・・・比較回路、４０・・・・・・リレー駆動回路、
４７・・・・・・直流電源回路。Fig. 1 is a circuit diagram of a temperature control device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the same temperature control device, Fig. 3 is a circuit diagram of a conventional temperature control device, and Fig. 4 is a circuit diagram of the same temperature control device. FIG. 3 is an explanatory diagram of the operation of the control device. 11...AC power supply, 12...Converter, 1
3...Temperature detection circuit, 19...Temperature setting circuit, 25...Superimposed signal generation circuit, 39...
... Comparison circuit, 40 ... Relay drive circuit,
47...DC power supply circuit.
Claims (1)
する温度検出回路と、前記負荷の温度を設定する温度設
定回路と、前記温度検出回路と前記温度設定回路の信号
を比較する比較回路と、前記比較回路の信号で駆動し交
流電源を負荷へ供給するリレー駆動回路と、直流部へ電
源を供給する直流電源回路とを備え、前記温度設定回路
又は前記温度検出回路に交流電源と異なる周波数の信号
を重畳する重畳信号発生回路を構成した温度制御装置。An AC power source, a load such as a heater, a temperature detection circuit that detects the temperature of the load, a temperature setting circuit that sets the temperature of the load, and a comparison circuit that compares signals from the temperature detection circuit and the temperature setting circuit. and a relay drive circuit that is driven by the signal of the comparison circuit and supplies AC power to the load, and a DC power supply circuit that supplies power to the DC section, and the temperature setting circuit or the temperature detection circuit has a relay drive circuit that supplies AC power to the load, and the temperature setting circuit or the temperature detection circuit has a relay drive circuit that supplies AC power to the load. A temperature control device configured with a superimposed signal generation circuit that superimposes frequency signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1145916A JPH0311576A (en) | 1989-06-08 | 1989-06-08 | Temperature control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1145916A JPH0311576A (en) | 1989-06-08 | 1989-06-08 | Temperature control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0311576A true JPH0311576A (en) | 1991-01-18 |
Family
ID=15396040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1145916A Pending JPH0311576A (en) | 1989-06-08 | 1989-06-08 | Temperature control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0311576A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5231413A (en) * | 1975-09-04 | 1977-03-09 | Kawasaki Heavy Ind Ltd | Landing device of levitation vehicle under abnormal conditions |
| JPS6231413A (en) * | 1985-07-31 | 1987-02-10 | Nippon Dennetsu Kk | Temperature controller |
-
1989
- 1989-06-08 JP JP1145916A patent/JPH0311576A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5231413A (en) * | 1975-09-04 | 1977-03-09 | Kawasaki Heavy Ind Ltd | Landing device of levitation vehicle under abnormal conditions |
| JPS6231413A (en) * | 1985-07-31 | 1987-02-10 | Nippon Dennetsu Kk | Temperature controller |
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