JPS5911417A - Electronic thermostat - Google Patents

Electronic thermostat

Info

Publication number
JPS5911417A
JPS5911417A JP57122325A JP12232582A JPS5911417A JP S5911417 A JPS5911417 A JP S5911417A JP 57122325 A JP57122325 A JP 57122325A JP 12232582 A JP12232582 A JP 12232582A JP S5911417 A JPS5911417 A JP S5911417A
Authority
JP
Japan
Prior art keywords
resistance
temperature
voltage
reference value
value setting
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
Application number
JP57122325A
Other languages
Japanese (ja)
Inventor
Toshio Maruke
登志雄 丸毛
Arikichi Morishige
森重　在吉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP57122325A priority Critical patent/JPS5911417A/en
Publication of JPS5911417A publication Critical patent/JPS5911417A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1902—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Control Of Temperature (AREA)

Abstract

PURPOSE:To ensure accurate control of temperature with simple constitution, by connecting in series a temperature detecting thermistor, a compensating resistance and a reference value setting resistance and then setting both the compensating resistance value and the reference value setting resistance value at a proper level, respectively. CONSTITUTION:A theristor 1, a compensating resistance 2 and a reference value setting resistance 3 are connected in series. The voltage V+ of a joint between resistance 2 and 3 is connected to a non-inverse input of a comparator CMP4; while the voltage V- generated from a temperature control resistance ladder circuit consisting of resistances 6-12 is connected to an inverse input of the CMP4. The output of the CMP4 is connected to an input (f) of an LSI15. Temperature control switches 12-15 supply a temperature set with a binary code to the LSI5. A transistor 17 is controlled with the output (g) of the LSI5, and a contact 18 of a relay 16 is turned on and off. Thus a compressor of an air cooler, etc. can be turned on and off. The resistance values of resistances 2 and 3 are selected properly to obtain the coincidence of characteristics between voltages V+ and V-. This device ensures an accurate control of temperature.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、ルームエアコンあるいは冷凍機器の温度制御
装置として使用される電子式サーモスタットに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electronic thermostat used as a temperature control device for room air conditioners or refrigeration equipment.

従来例の構成とその問題点 従来この種の電子式サーモスタットは、第５図に示すよ
うに構成されていた。すなわち、室温全検知するサーミ
スタ１に並列抵抗２ａ６接続し、前記並列回路と基準値
設定抵抗３の接続点の電圧Ｖ（４１’ｔコンパレータ４
の入力電圧とし、そしてり、ＳＩ６の出力ポートａ、ｂ
、ｃ、ｄ、ｅにそれぞれ接続された抵抗６〜１０で抵抗
ラダー回路を構成して抵抗１１．１２とともに前記コン
パレータ４の基準電圧ｖへ全設定していた。そして前記
入力電圧■（＋）の値を判定し、コンパ１ノータ４の出
力ｉＬ、ｓＩ５の入力ポートｆに入力する。才た温度調
節スイッチ１２〜１６はバイナリコードによる設定温度
１ＬｓＩ５に入力する。さらにリレーコイル１６は前記
ＬＳ　ＩＦ５の出力ポートｑに接続されたトランジスタ
１７によって駆動はれ、リレー接点１Ｂ？、＜ＯＮ、Ｏ
ＦＦ制御することにより、冷房機の圧縮機（いずれも図
示せず）などｉＯＮ。Conventional configuration and its problems Conventionally, this type of electronic thermostat has been configured as shown in FIG. That is, a parallel resistor 2a6 is connected to the thermistor 1 that detects the entire room temperature, and the voltage V (41't comparator 4) at the connection point between the parallel circuit and the reference value setting resistor 3 is
and the output ports a and b of SI6 are
, c, d, and e respectively constitute a resistor ladder circuit, and together with resistors 11 and 12, the reference voltage v of the comparator 4 is set. Then, the value of the input voltage (+) is determined and inputted to the output iL of the comparator 1 noter 4 and the input port f of sI5. The temperature control switches 12 to 16 input the set temperature 1LsI5 in binary code. Further, the relay coil 16 is driven by the transistor 17 connected to the output port q of the LS IF5, and the relay contact 1B? ,＜ON,O
iON, such as the compressor of an air conditioner (none of which is shown), by controlling the FF.

ＯＦＦ制御するようにしている。なお、１９はダイオー
ド、２ｏは電源である。I am trying to control it to OFF. Note that 19 is a diode, and 2o is a power supply.

そして温度調節スイッチ１２〜１５による設定温度に対
応した基準電圧Ｖ（−）より、入力電圧Ｖ（＋）が高い
場合すなわち検出温度が高い場合は、ＬＳＩ５の出力ポ
ートｑが出力し、トランジスタ１７をＯＮＮ動作−已、
リレーコイル１６およびそのリレー接点１８をＯＮ動作
して圧縮機を運転し、冷房運転を行うよう動作する。ま
た基準電圧”（−）よシ入力電圧Ｖ（＋）が低いすなわ
ち検出温度が低い場合は、ＬＳＩ６は出力全停止し、圧
縮機の運転全停止する・ 以上述べた従来の電子式サーモスタットの温度検知回路
は、基準電圧Ｖ（−）の特性が第６図のＡで示す様に温
度変化に追従して全体がわん曲する一方、入力電圧■（
＋）の特性はサーミスタ１に並列補償抵抗２八を接続し
ているため、同図の已に示すようにほぼ直線的に変化し
、前記基準電圧”（−）の変化特性とは一致しない。When the input voltage V(+) is higher than the reference voltage V(-) corresponding to the temperature set by the temperature control switches 12 to 15, that is, when the detected temperature is high, the output port q of the LSI 5 outputs an output, and the transistor 17 is ONN operation - 已,
The relay coil 16 and its relay contacts 18 are turned ON to operate the compressor and perform cooling operation. In addition, if the input voltage V (+) is lower than the reference voltage (-), that is, the detected temperature is low, the LSI 6 will completely stop its output and the compressor will completely stop operating.The temperature of the conventional electronic thermostat described above In the detection circuit, the characteristic of the reference voltage V(-) follows the temperature change and curves as a whole as shown by A in Figure 6, while the input voltage V(-)
Since the parallel compensating resistor 28 is connected to the thermistor 1, the characteristics of +) change almost linearly as shown in the figure, and do not match the change characteristics of the reference voltage "(-)."

したがって、第７図に示す温度特性が全体にわん曲して
しまい、設定温度と制御温度に誤差が生じてしまい、設
定温度の変化に追従してデファレンシャル値が変化し、
正確な温度制御ができない欠点を有していた。Therefore, the temperature characteristics shown in Fig. 7 are curved as a whole, an error occurs between the set temperature and the control temperature, and the differential value changes to follow the change in the set temperature.
It had the disadvantage that accurate temperature control was not possible.

発明の目的 本発明は、上記従来の電子式サーモスタットにみられる
欠点全解消するもので、簡単な構成により正確な温度制
御が行えるようにすることを目的とするものである。OBJECTS OF THE INVENTION The present invention aims to eliminate all the drawbacks of the conventional electronic thermostats mentioned above, and it is an object of the present invention to enable accurate temperature control with a simple configuration.

発明の構成 この目的全達成するために本発明は、サーミスタと直列
に補正抵抗を接続し、この補正抵抗と基準値設定抵抗の
面抵抗値をそれぞれ適当に選択することによシ、入力電
圧Ｖ（＋）の変化特性を基準電圧Ｖ（−）の変化特性と
一致させたものである。Structure of the Invention In order to achieve all of these objects, the present invention connects a correction resistor in series with the thermistor, and appropriately selects the sheet resistance values of the correction resistor and the reference value setting resistor, respectively, thereby adjusting the input voltage V. The (+) change characteristic is matched with the change characteristic of the reference voltage V(-).

実施例の説明 本発明の一実施例を添付図面の第１図〜第４図にもとづ
いて説明する。なお、冷房機の一般的な動作については
周知のため、その説明を省略する。DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 4 of the accompanying drawings. Note that since the general operation of the air conditioner is well known, a description thereof will be omitted.

また従来例と同一のものについては同一の付号を付して
説明する。Components that are the same as those in the conventional example will be described with the same reference numerals.

ここで本発明と従来例の相異する点は、サーミスタ１の
補正構造が異なるのみで、他の動作は全く同じである。Here, the only difference between the present invention and the conventional example is the correction structure of the thermistor 1, and the other operations are completely the same.

したがって、ここでは前記サーミスタ１を含む入力電圧
Ｖ（＋）の設定構造を中心に説明する。Therefore, the setting structure of the input voltage V(+) including the thermistor 1 will be mainly explained here.

第１図において、抵抗ラダー回路を構成する抵抗６〜１
２による基準電圧Ｖ←）は、抵抗６〜９の並列合成抵抗
特性が直線的に変化せず、並列の抵抗数の増加にともな
って、その抵抗変化率が減少しわん曲するものであるこ
とから、基準電圧Ｖ　（−）の変化特性も第２図のＡに
示すようにわん曲したものになる。In Figure 1, resistors 6 to 1 forming the resistance ladder circuit
2, the reference voltage V←) is such that the parallel composite resistance characteristics of resistors 6 to 9 do not change linearly, but the rate of change in resistance decreases and curves as the number of parallel resistors increases. Therefore, the change characteristic of the reference voltage V (-) also becomes curved as shown at A in FIG.

一方、入力電圧Ｖ（＋）において、サーミスタ１は並列
抵抗を有しないため、サーミスタ１の抵抗変化特性（Ｂ
定数）を生かした状態で、補正抵抗２および基準値設定
抵抗３の抵抗値を適当に選択することによって、前記入
力電圧Ｖ（→の変化特性を前記基準電圧”（−）の変化
特性にほぼ一致させることができる。On the other hand, at the input voltage V(+), thermistor 1 has no parallel resistance, so the resistance change characteristic of thermistor 1 (B
By appropriately selecting the resistance values of the correction resistor 2 and the reference value setting resistor 3 while taking advantage of the constant), the change characteristics of the input voltage V Can be matched.

この状態を第２図のＢに示す。ここで同図Ｂの曲線ａは
同図のＡに示す基準電圧Ｖ（→の特性と一致した状態を
示し、同図Ｂの曲線すは前記補正抵抗２および基準値設
定抵抗３の抵抗値を同図の曲ｉａのときの値より小さく
した状態であり、また同図の曲線Ｃは前記面抵抗２．３
の値を太きぐした状態の一例である。This state is shown in B of FIG. Here, the curve a in the figure B shows a state that matches the characteristics of the reference voltage V (→) shown in the figure A, and the curve B in the figure shows the resistance value of the correction resistor 2 and the reference value setting resistor 3. The value is smaller than that of curve ia in the figure, and curve C in the figure shows the sheet resistance of 2.3
This is an example of a state in which the value of is increased.

したがって第２図Ａの変化特性を有する基準電圧Ｖ（−
）と同図Ｂの曲線孔の変化特性を有する入力電圧Ｖ（＋
）からなるサーモスタットの温度特性は、第３図に示す
ように大変良好な直線性が得られる。Therefore, the reference voltage V(-
) and the input voltage V(+
) The temperature characteristics of the thermostat shown in FIG. 3 have very good linearity.

またディファレンシャルは温度変化の全域にわたり一定
したものになる。Also, the differential remains constant over the entire range of temperature changes.

次に、第１図の回路において、電源電圧１１０Ｖ、サー
ミスタ１のＢ定数を４１０００に、同サーミスタ１の抵
抗値を１０にΩ（２５℃）として温度特性の実験を行っ
た結果、分解能（電圧変化率）約８０ｍＶ／℃以下では
常温域において十分な直線性が得られた。第４図Ａはそ
の実験を行った各抵抗６〜１２および補正抵抗２、基準
値設定抵抗３の値を示し、同図Ｂは設定温度を１６°Ｃ
１２４℃、３０°Ｃと設定したときのバイナリコード値
、サーモスタットの０８点、ＯＦＦ点、デファレンシャ
ル値（ＤＩＦＦ）の実測値を示し、また同図Ｃはその温
度特性を示す。この回路の分解能は約７５ｍＶ／℃、温
度調節範囲は１６℃〜３０℃である。Next, in the circuit shown in Figure 1, we conducted an experiment on the temperature characteristics with the power supply voltage 110V, the B constant of thermistor 1 set to 41000, and the resistance value of thermistor 1 set to 10Ω (25°C). When the rate of change was approximately 80 mV/°C or less, sufficient linearity was obtained in the room temperature range. Figure 4A shows the values of each resistor 6 to 12, correction resistor 2, and reference value setting resistor 3 used in the experiment, and Figure 4B shows the set temperature at 16°C.
The actual measured values of the binary code value, the 08 point of the thermostat, the OFF point, and the differential value (DIFF) when set to 124°C and 30°C are shown, and C in the same figure shows its temperature characteristics. The resolution of this circuit is approximately 75 mV/°C, and the temperature control range is 16°C to 30°C.

発明の効果 上記実施例より明らかなように、本発明の電子式ザーモ
スタソトは、サーミスタと直列に補正抵抗を接続したた
め、温度特性の直線性が大巾に改善され、設定温度と制
御温度の誤差がなくなり、正確な１見度設定が可能とな
り、またディファレンシャルが一定したため、動作が安
定し、温度制御として快適性の向上がはかれ、さらに使
用部品数は従来と同数でありながら特性改善がはかれる
ため、特性改善のために高価なＡ／Ｄコンバータを使用
する必要がなくなシ、実用上十分な特性が実現できるな
ど、種々の利点を有するものである。Effects of the Invention As is clear from the above embodiments, the electronic thermostat of the present invention has a correction resistor connected in series with the thermistor, so the linearity of the temperature characteristic is greatly improved, and the error between the set temperature and the control temperature is reduced. This makes it possible to set accurate one-sight angles, and because the differential is constant, operation is stable and temperature control is improved for comfort.Furthermore, the number of parts used is the same as before, but the characteristics are improved. It has various advantages, such as eliminating the need to use an expensive A/D converter to improve characteristics, and achieving practically sufficient characteristics.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例における電子式ザーモスタン
トの電気回路図、第２図Ａ、Ｂはそれぞれ同サーモスタ
ットにおけるコンパレータの入力電圧特性図、第３図は
同サーモスタットの温度特性図、第４図Ａ、Ｂ、Ｃは同
サーモスタットにおける実測抵抗値を示す要部回路図、
実測定値図および温度特性図、第５図は従来例を示す電
子式ザーモスタットの電気回路図、第６図Ａ、Ｂはそれ
ぞれ同サーモスタンドにおけるコンパレータの入力電圧
特性図、第７図は同サーモスタットの温度特性図である
。 １・・・・・・サーミスタ、２・川・・補正抵抗、３・
・印・基準値設定抵抗、４・・・・・・コンパレータ、
６〜１２・・・・・・抵抗。 代理人の氏名　弁理士　中　尾　敏　男　はが１名第１
図 シＸフイレ、　−ＰＡＬ　ｌ　　− 第４図 設足遥凌Figure 1 is an electric circuit diagram of an electronic thermostat according to an embodiment of the present invention, Figures 2A and B are input voltage characteristic diagrams of the comparator in the same thermostat, Figure 3 is a temperature characteristic diagram of the same thermostat, and Figure 4 is a diagram of the temperature characteristics of the same thermostat. Figures A, B, and C are main circuit diagrams showing the measured resistance values of the same thermostat.
Actual measured value diagram and temperature characteristic diagram; Figure 5 is an electric circuit diagram of a conventional electronic thermostat; Figures 6A and B are input voltage characteristic diagrams of the comparator in the same thermostand; Figure 7 is the same thermostat. FIG. 1... Thermistor, 2... Correction resistance, 3...
・Mark ・Reference value setting resistor, 4...Comparator,
6-12...Resistance. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 4

Claims (1)

【特許請求の範囲】[Claims] サーミスタおよび補正抵抗と基準値設定抵抗で直列回路
全構成し、前記直列回路の補正抵抗と基準値設定抵抗の
接続点の電圧をコンパレータの一方の入力電圧とし、温
度調節用抵抗ラダー回路で発生する電圧を前記コンパレ
ータの他方の入力電圧とする温度検知回路を具備した電
子式サーモスフ居。A series circuit is constructed entirely of a thermistor, a correction resistor, and a reference value setting resistor, and the voltage at the connection point of the correction resistor and reference value setting resistor in the series circuit is used as one input voltage of a comparator, and is generated in a temperature adjustment resistance ladder circuit. An electronic thermostat comprising a temperature detection circuit that uses a voltage as the other input voltage of the comparator.
JP57122325A 1982-07-13 1982-07-13 Electronic thermostat Pending JPS5911417A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57122325A JPS5911417A (en) 1982-07-13 1982-07-13 Electronic thermostat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57122325A JPS5911417A (en) 1982-07-13 1982-07-13 Electronic thermostat

Publications (1)

Publication Number Publication Date
JPS5911417A true JPS5911417A (en) 1984-01-21

Family

ID=14833169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57122325A Pending JPS5911417A (en) 1982-07-13 1982-07-13 Electronic thermostat

Country Status (1)

Country Link
JP (1) JPS5911417A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5010223A (en) * 1988-05-31 1991-04-23 Sang Wook Suh International Output control circuit of a 4-burner electronics induction heating cook system and a control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5010223A (en) * 1988-05-31 1991-04-23 Sang Wook Suh International Output control circuit of a 4-burner electronics induction heating cook system and a control method thereof

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