JP2006184097A - Noncontact temperature sensor and abnormality sensing method for the noncontact temperature sensor - Google Patents

Noncontact temperature sensor and abnormality sensing method for the noncontact temperature sensor Download PDF

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JP2006184097A
JP2006184097A JP2004376826A JP2004376826A JP2006184097A JP 2006184097 A JP2006184097 A JP 2006184097A JP 2004376826 A JP2004376826 A JP 2004376826A JP 2004376826 A JP2004376826 A JP 2004376826A JP 2006184097 A JP2006184097 A JP 2006184097A
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temperature sensor
circuit
contact temperature
disconnection
input terminal
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Chihiro Onishi
千尋 大西
Hiroyuki Miura
宏之 三浦
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Omron Corp
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Omron Corp
Omron Tateisi Electronics Co
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Abstract

<P>PROBLEM TO BE SOLVED: To utilize a disconnection sensing circuit for a temperature regulator connected to a noncontact temperature sensor, and sense abnormality of the noncontact temperature sensor. <P>SOLUTION: An analog switch 10 is provided in series between an input terminal 2a of the temperature regulator 1 and an amplification circuit 9. The analog switch 10 is controlled and switched by a control circuit 11, in response to the existence of a supplied DC power supply Vcc. When the DC power supply Vcc is not supplied, the analog switch 10 is opened, and this is sensed by a detection circuit 6 for the temperature regulator 1 that detects the state equivalent to disconnection. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、被検知体の表面温度を非接触で計測する非接触温度センサおよび該センサの異常を検知する方法に関する。   The present invention relates to a non-contact temperature sensor that measures the surface temperature of a detected object in a non-contact manner and a method for detecting an abnormality of the sensor.

従来、例えば、ローラや軸のように回転する被加熱体を加熱する温度制御では、非接触温度センサによって被加熱体の温度を非接触で計測し、それに基いて、被加熱体の温度が所望の温度になるように加熱装置を制御している（例えば、特許文献１参照）。
特開２００３−２５７５９１号公報 Conventionally, for example, in temperature control for heating a heated object such as a roller or a shaft, the temperature of the heated object is measured in a non-contact manner by a non-contact temperature sensor, and the temperature of the heated object is determined based on the measured temperature. The heating device is controlled so that the temperature becomes (see, for example, Patent Document 1).
JP 2003-257591 A

かかる温度制御には、温度調節器が用いられるが、一般に温度調節器は、温度センサとして用いられる熱電対の断線（バーンアウト）を検知する断線検知回路を備えている。   For such temperature control, a temperature regulator is used. Generally, the temperature regulator includes a disconnection detection circuit that detects disconnection (burnout) of a thermocouple used as a temperature sensor.

この断線検知回路は、図３に示すように、抵抗Ｒを介して直流電源ＶＲから熱電対４に常時微小な電流を流しておき、熱電対４あるいは補償導線に断線７が生じた場合には、直流電源ＶＲの電位が増幅回路５で増幅されて断線検知回路６に与えられることになり、断線がないときの電位に比べて大きくなるので、それに基いて、断線検知回路６では、断線を検知できることになる。 The disconnection detecting circuit, as shown in FIG. 3, via a resistor R keep flowing constantly minute current to the thermocouple 4 from the DC power supply V R, when disconnection thermocouple 4 or compensating lead wire 7 has occurred will become the potential of the DC power source V R is applied to the disconnection detection circuit 6 is amplified by the amplifier circuit 5, it becomes larger than the potential when there is no disconnection, based thereon, the disconnection detection circuit 6, Disconnection can be detected.

非接触温度センサは、一般に、熱電対の起電力と同等の出力電圧に設計されており、温度調節器１の熱電対４が接続される入力端子２ａ，２ｂに接続して使用される。   The non-contact temperature sensor is generally designed to have an output voltage equivalent to the electromotive force of the thermocouple, and is used by being connected to the input terminals 2a and 2b to which the thermocouple 4 of the temperature controller 1 is connected.

非接触温度センサ３０の場合にも、図４に示すように、断線検知回路６によってリード線１４等の断線を検知することはできるけれども、サーモパイルのようなセンサ素子８の出力を増幅する増幅回路９を内蔵しており、図示しないＤＣ電源から直流電源Ｖｃｃが供給されておらず、動作していない場合（この場合、出力電圧は０Ｖとなる）のような異常を、断線検知回路６で検知することはできなかった。 In the case of non-contact temperature sensor 3 0, as shown in FIG. 4, although it is possible to detect the disconnection of such leads 14 by disconnection detecting circuit 6, the amplifier for amplifying the output of the sensor element 8, such as a thermopile The disconnection detection circuit 6 detects an abnormality such as when the circuit 9 is built in and the DC power source Vcc is not supplied from a DC power source (not shown) and is not operating (in this case, the output voltage is 0 V). It could not be detected.

本発明は、このような実情に着目してなされたものであって、断線検知回路で、断線以外の異常も検知できるようにした非接触温度センサおよび非接触温度センサの異常検知方法を提供することを目的とする。   The present invention has been made paying attention to such a situation, and provides a non-contact temperature sensor and a non-contact temperature sensor abnormality detection method in which an abnormality other than the disconnection can be detected by a disconnection detection circuit. For the purpose.

本発明では、上述の目的を達成するために、次のように構成している。   The present invention is configured as follows in order to achieve the above-described object.

すなわち、本発明は、熱電対が接続される入力端子および前記熱電対の断線を検知する断線検知回路を備える温度調節器の前記入力端子に接続可能な非接触温度センサであって、前記入力端子に直列に接続されるスイッチ回路と、該スイッチ回路の開閉を制御する制御回路とを備えている。   That is, the present invention is a non-contact temperature sensor connectable to the input terminal of a temperature regulator including an input terminal to which a thermocouple is connected and a disconnection detection circuit for detecting disconnection of the thermocouple, And a control circuit for controlling opening and closing of the switch circuit.

非接触温度センサは、サーモパイルのようなセンサ素子と、該センサ素子の出力を増幅する増幅回路とを備え、前記スイッチ回路は、前記増幅回路とプラス側の前記入力端子との間に設けられるのが好ましい。   The non-contact temperature sensor includes a sensor element such as a thermopile and an amplifier circuit that amplifies the output of the sensor element, and the switch circuit is provided between the amplifier circuit and the positive input terminal. Is preferred.

前記制御回路は、当該非接触温度センサへの電源の供給の有無に応じて、前記スイッチ回路の開閉を制御するのが好ましく、また、前記制御回路は、前記増幅回路の出力電圧に応じて、前記スイッチ回路の開閉を制御するのが好ましい。さらに、制御回路は、前記電源の供給がないとき、および／または、前記出力電圧が異常であるときに、前記スイッチ回路を開くのが好ましい。   The control circuit preferably controls the opening and closing of the switch circuit according to the presence or absence of power supply to the non-contact temperature sensor, and the control circuit according to the output voltage of the amplifier circuit, It is preferable to control the opening and closing of the switch circuit. Further, it is preferable that the control circuit opens the switch circuit when the power is not supplied and / or when the output voltage is abnormal.

上記構成によると、温度調節器の入力端子に直列のスイッチ回路を開くことにより、温度調節器の断線検知回路は、それを断線として検知することができるので、当該非接触温度センサへ電源が供給されていない、あるいは、増幅回路の出力電圧が正常でないような異常のときに、スイッチ回路を開くことで、断線検知回路で異常を検知できることになる。   According to the above configuration, by opening a switch circuit in series with the input terminal of the temperature controller, the disconnection detection circuit of the temperature controller can detect it as a disconnection, so power is supplied to the non-contact temperature sensor. When the abnormality is not performed or the abnormality is such that the output voltage of the amplifier circuit is not normal, the disconnection detection circuit can detect the abnormality by opening the switch circuit.

また、本発明は、熱電対が接続される入力端子および前記熱電対の断線を検知する断線検知回路を備える温度調節器の前記入力端子に接続可能な非接触温度センサの異常を検知する方法であって、前記非接触温度センサと入力端子との間にスイッチ回路を介装し、該非接触温度センサへの電源の供給の有無に基いて、前記スイッチ回路の開閉を制御するものである。   Further, the present invention is a method for detecting an abnormality of a non-contact temperature sensor connectable to the input terminal of a temperature controller provided with an input terminal to which a thermocouple is connected and a disconnection detection circuit for detecting disconnection of the thermocouple. A switch circuit is interposed between the non-contact temperature sensor and the input terminal, and the opening and closing of the switch circuit is controlled based on whether or not power is supplied to the non-contact temperature sensor.

前記電源の供給がないとき、および／または、前記出力電圧が異常であるときに、前記スイッチ回路を開くのが好ましい。   The switch circuit is preferably opened when the power is not supplied and / or when the output voltage is abnormal.

上記構成によると、温度調節器の入力端子に直列のスイッチ回路を開くことにより、温度調節器の断線検知回路は、それを断線として検知することができるので、当該非接触温度センサに電源が供給されていないような異常のときに、スイッチ回路を開くことで、断線検知回路で異常を検知できることになる。   According to the above configuration, by opening a switch circuit in series with the input terminal of the temperature controller, the disconnection detection circuit of the temperature controller can detect it as a disconnection, so power is supplied to the non-contact temperature sensor. When the abnormality is not performed, the disconnection detection circuit can detect the abnormality by opening the switch circuit.

本発明によると、非接触温度センサの異常、例えば、電源が供給されていない、あるいは、出力が正常でないといった異常を、当該非接触温度センサが接続される温度調節器の断線検知回路を利用して検知できることになる。   According to the present invention, an abnormality of a non-contact temperature sensor, for example, an abnormality such that power is not supplied or an output is not normal is detected using a disconnection detection circuit of a temperature controller to which the non-contact temperature sensor is connected. Can be detected.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施の形態１）
図１は、本発明の一つの実施の形態に係る非接触温度センサを、温度調節器に接続した状態を示す要部の構成図である。 (Embodiment 1)
FIG. 1 is a configuration diagram of a main part showing a state in which a non-contact temperature sensor according to one embodiment of the present invention is connected to a temperature controller.

温度調節器１の入力端子２ａ，２ｂには、本発明に係る非接触温度センサ３が接続される。この入力端子２ａ，２ｂには、図３に示すように、非接触温度センサ３に代えて、熱電対４を接続して温度を計測することも可能である。   The non-contact temperature sensor 3 according to the present invention is connected to the input terminals 2 a and 2 b of the temperature controller 1. As shown in FIG. 3, the input terminals 2 a and 2 b can be connected to a thermocouple 4 instead of the non-contact temperature sensor 3 to measure the temperature.

温度調節器１は、従来と同様に、熱電対４の断線を検知できるように、抵抗Ｒを介して接続されているセンサに電流を流すための直流電源ＶＲと、増幅回路５で増幅されたセンサの入力が与えられる断線検知回路６とを備えている。なお、増幅回路５の出力は、図示しない計測処理回路に与えられて、温度の計測処理が行われる。 Temperature controller 1, as in the prior art, so that it can detect the disconnection of the thermocouple 4, a DC power source V R for supplying a current to the sensor through a resistor R is connected, it is amplified by the amplifier circuit 5 And a disconnection detection circuit 6 to which an input of the sensor is applied. The output of the amplifier circuit 5 is given to a measurement processing circuit (not shown) to perform temperature measurement processing.

熱電対４あるいは補償導線に断線７が生じると、前記直流電源ＶＲの電位が増幅回路５で増幅されて断線検知回路６に与えられることになり、断線がないときの電位に比べて大きくなるので、それに基いて、断線検知回路６では、従来と同様にして断線を検知できることになる。 When disconnection 7 thermocouple 4 or compensating lead wires occurs, will be the potential of the DC power source V R is applied to the disconnection detection circuit 6 is amplified by the amplifier circuit 5, it becomes larger than the potential when there is no break Therefore, based on this, the disconnection detection circuit 6 can detect disconnection in the same manner as in the prior art.

温度調節器１の熱電対４が接続される入力端子２ａ，２ｂに接続される非接触温度センサ３は、図１に示すように、サーモパイル等のセンサ素子８と、このセンサ素子８の出力を増幅する増幅回路９とを備えており、図示しないＤＣ電源から直流電源Ｖｃｃが供給される。   As shown in FIG. 1, the non-contact temperature sensor 3 connected to the input terminals 2a and 2b to which the thermocouple 4 of the temperature controller 1 is connected has a sensor element 8 such as a thermopile and the output of the sensor element 8 as follows. An amplifying circuit 9 for amplifying is provided, and a DC power source Vcc is supplied from a DC power source (not shown).

以上の構成は、基本的に従来の非接触温度センサと同様である。   The above configuration is basically the same as that of a conventional non-contact temperature sensor.

この実施の形態では、断線以外の異常、例えば、直流電源が供給されていないときには、その異常を温度調節器１の断線検知回路６で検知できるように、次のように構成している。   This embodiment is configured as follows so that an abnormality other than disconnection, for example, when DC power is not supplied, can be detected by the disconnection detection circuit 6 of the temperature controller 1.

すなわち、この実施の形態の非接触温度センサ３は、温度調節器１のプラス側の入力端子２ａと増幅回路９との間に、直列に介装されたスイッチ回路としてのアナログスイッチ１０と、アナログスイッチ１０の開閉を制御する制御回路１１とを備えている。   That is, the non-contact temperature sensor 3 of this embodiment includes an analog switch 10 as a switch circuit interposed in series between the plus-side input terminal 2a of the temperature controller 1 and the amplifier circuit 9, and an analog And a control circuit 11 for controlling the opening and closing of the switch 10.

制御回路１１は、直流電源Ｖｃｃの供給の有無に応じて、アナログスイッチ１０の開閉を制御するものであり、直流電源Ｖｃｃが供給されているときには、ハイレベルの出力によって、アナログスイッチ１０をオン（閉）し、直流電源Ｖｃｃが断線などによって供給されていないときには、ローレベルの出力によって、アナログスイッチ１０をオフ（開）する。   The control circuit 11 controls the opening and closing of the analog switch 10 according to whether or not the DC power supply Vcc is supplied. When the DC power supply Vcc is supplied, the control circuit 11 turns on the analog switch 10 with a high level output ( When the DC power source Vcc is not supplied due to disconnection or the like, the analog switch 10 is turned off (opened) by a low level output.

すなわち、直流電源Ｖｃｃが供給されていないときには、アナログスイッチ１０がオフして断線が生じた状態と等価となる。このため、温度調節器１では、アナログスイッチ１０がオフしたことを、断線検知回路６で検知することができ、直流電源Ｖｃｃが供給されていないことを検知できることになる。   That is, when the DC power supply Vcc is not supplied, this is equivalent to a state in which the analog switch 10 is turned off and disconnection occurs. For this reason, the temperature controller 1 can detect that the analog switch 10 is turned off by the disconnection detection circuit 6 and can detect that the DC power supply Vcc is not supplied.

なお、温度調節器１は、断線検知回路６で断線を検知したときには、表示や警報等の報知を行う。   Note that when the disconnection detection circuit 6 detects a disconnection, the temperature controller 1 gives a notification such as a display or an alarm.

このように、非接触温度センサ３に、アナログスイッチ１０および制御回路１１を追加することにより、従来から温度調節器１に搭載されている断線検知回路６を用いて、非接触温度センサ３の異常を検知できることになる。   In this way, by adding the analog switch 10 and the control circuit 11 to the non-contact temperature sensor 3, the disconnection detection circuit 6 that has been conventionally mounted on the temperature regulator 1 is used to detect an abnormality in the non-contact temperature sensor 3. Can be detected.

（実施の形態２）
図２は、本発明の他の実施の形態に係る非接触温度センサを、温度調節器に接続した状態を示す要部のブロック図であり、上述の実施の形態に対応する部分には、同一の参照符号を付す。 (Embodiment 2)
FIG. 2 is a block diagram of a main part showing a state in which a non-contact temperature sensor according to another embodiment of the present invention is connected to a temperature controller, and parts corresponding to the above-described embodiment are identical. The reference sign is attached.

この実施の形態では、アナログスイッチ１０の開閉を制御する制御回路１１’は、直流電源Ｖｃｃに一方の入力端子が接続されるとともに、ウインドコンパレータ１２の出力に他方の入力端子が接続されたアンド回路１３と、増幅回路９の出力電圧が与えられる前記ウインドコンパレータ１２とを備えている。   In this embodiment, the control circuit 11 ′ for controlling the opening and closing of the analog switch 10 is an AND circuit in which one input terminal is connected to the DC power source Vcc and the other input terminal is connected to the output of the window comparator 12. 13 and the window comparator 12 to which the output voltage of the amplifier circuit 9 is given.

ウインドコンパレータ１２は、増幅回路９の出力電圧と、上下限の基準電圧ＶＵ，ＶＬとを比較し、増幅回路９の出力電圧が、基準電圧範囲にあるときには、ハイレベルの出力を、アンド回路１３に与え、基準電圧範囲外にあるときには、ローレベルの出力を、アンド回路１３に与える。 The window comparator 12 compares the output voltage of the amplifier circuit 9 with the upper and lower limit reference voltages V U and V L. When the output voltage of the amplifier circuit 9 is in the reference voltage range, the window comparator 12 outputs a high level output. When it is supplied to the circuit 13 and is outside the reference voltage range, a low level output is supplied to the AND circuit 13.

したがって、アンド回路１３は、直流電源Ｖｃｃが供給されており、しかも、増幅回路９の出力電圧が、基準電圧範囲にあるとき、すなわち、正常なときには、アナログスイッチ１０に対してハイレベルの出力を与え、これによって、アナログスイッチ１０は、オン（閉）し、温度の計測が行える。   Therefore, the AND circuit 13 is supplied with the DC power supply Vcc, and outputs a high level output to the analog switch 10 when the output voltage of the amplifier circuit 9 is in the reference voltage range, that is, when it is normal. As a result, the analog switch 10 is turned on (closed), and the temperature can be measured.

一方、直流電源Ｖｃｃが供給されていないとき、あるいは、増幅回路の出力電圧が、基準電圧範囲外にあるとき、すなわち、異常なときには、アナログスイッチ１０に対して、ローレベルの出力を与え、これによって、アナログスイッチ１０がオフ（開）し、断線が生じた状態と等価となる。このため、温度調節器１では、アナログスイッチ１０がオフしたことを、断線検知回路６で検知することができ、直流電源Ｖｃｃが供給されていない、あるいは、増幅回路９の出力電圧が、基準電圧範囲外にある異常を、検知できることになる。   On the other hand, when the DC power source Vcc is not supplied, or when the output voltage of the amplifier circuit is outside the reference voltage range, that is, when it is abnormal, a low level output is given to the analog switch 10, This is equivalent to a state in which the analog switch 10 is turned off (opened) and a disconnection occurs. For this reason, in the temperature controller 1, the disconnection detection circuit 6 can detect that the analog switch 10 is turned off, and the DC power source Vcc is not supplied, or the output voltage of the amplifier circuit 9 is the reference voltage. Anomalies that are out of range can be detected.

（その他の実施の形態）
上述の実施の形態では、スイッチ回路としてアナログスイッチ１０を用いたけれども、本発明は、アナログスイッチ１０に限らず、リレーなどを用いてもよい。 (Other embodiments)
In the above-described embodiment, the analog switch 10 is used as the switch circuit. However, the present invention is not limited to the analog switch 10 and a relay or the like may be used.

上述の実施の形態では、スイッチ回路および制御回路を、非接触温度センサに内蔵したけれども、本発明の他の実施の形態として、非接触温度センサとは別体の装置として構成してもよい。   In the above-described embodiment, the switch circuit and the control circuit are incorporated in the non-contact temperature sensor. However, as another embodiment of the present invention, the switch circuit and the control circuit may be configured as a separate device from the non-contact temperature sensor.

本発明は、非接触温度センサの異常検知に有用である。   The present invention is useful for detecting an abnormality of a non-contact temperature sensor.

本発明に係る非接触温度センサと温度調節器との接続状態を示す図である。It is a figure which shows the connection state of the non-contact temperature sensor which concerns on this invention, and a temperature regulator. 本発明の他の実施の形態の非接触温度センサと温度調節器との接続状態を示す図である。It is a figure which shows the connection state of the non-contact temperature sensor and temperature controller of other embodiment of this invention. 熱電対と温度調節器との接続状態を示す図である。It is a figure which shows the connection state of a thermocouple and a temperature controller. 従来例の非接触温度センサと温度調節器との接続状態を示す図である。It is a figure which shows the connection state of the non-contact temperature sensor and temperature controller of a prior art example.

符号の説明Explanation of symbols

１ 温度調節器
２ａ，２ｂ 入力端子
３，３’ 非接触温度センサ
４ 熱電対
５，９ 増幅回路
６ 断線検知回路
８ センサ素子
１０ アナログスイッチ
１１ 制御回路 DESCRIPTION OF SYMBOLS 1 Temperature controller 2a, 2b Input terminal 3, 3 'Non-contact temperature sensor 4 Thermocouple 5, 9 Amplifier circuit 6 Disconnection detection circuit 8 Sensor element 10 Analog switch 11 Control circuit

Claims (5)

熱電対が接続される入力端子および前記熱電対の断線を検知する断線検知回路を備える温度調節器の前記入力端子に接続可能な非接触温度センサであって、
前記入力端子に直列に接続されるスイッチ回路と、該スイッチ回路の開閉を制御する制御回路とを備えることを特徴とする非接触温度センサ。 A non-contact temperature sensor connectable to the input terminal of a temperature controller comprising an input terminal to which a thermocouple is connected and a disconnection detection circuit for detecting disconnection of the thermocouple,
A non-contact temperature sensor comprising: a switch circuit connected in series to the input terminal; and a control circuit for controlling opening and closing of the switch circuit. センサ素子と、該センサ素子の出力を増幅する増幅回路とを備え、前記スイッチ回路は、前記増幅回路とプラス側の前記入力端子との間に設けられる請求項１に記載の非接触温度センサ。   The non-contact temperature sensor according to claim 1, further comprising: a sensor element; and an amplifier circuit that amplifies an output of the sensor element, wherein the switch circuit is provided between the amplifier circuit and the input terminal on the plus side. 前記制御回路は、当該非接触温度センサへの電源の供給の有無に応じて、前記スイッチ回路の開閉を制御する請求項１または２に記載の非接触温度センサ。   3. The non-contact temperature sensor according to claim 1, wherein the control circuit controls opening and closing of the switch circuit according to whether or not power is supplied to the non-contact temperature sensor. 前記制御回路は、前記増幅回路の出力電圧に応じて、前記スイッチ回路の開閉を制御する請求項２記載の非接触温度センサ。   The non-contact temperature sensor according to claim 2, wherein the control circuit controls opening and closing of the switch circuit according to an output voltage of the amplifier circuit. 熱電対が接続される入力端子および前記熱電対の断線を検知する断線検知回路を備える温度調節器の前記入力端子に接続可能な非接触温度センサの異常を検知する方法であって、
前記非接触温度センサと入力端子との間にスイッチ回路を介装し、該非接触温度センサへの電源の供給の有無に基いて、前記スイッチ回路の開閉を制御することを特徴とする非接触温度センサの異常検知方法。 A method for detecting an abnormality of a non-contact temperature sensor connectable to the input terminal of a temperature controller comprising an input terminal to which a thermocouple is connected and a disconnection detection circuit for detecting disconnection of the thermocouple,
A non-contact temperature, wherein a switch circuit is interposed between the non-contact temperature sensor and an input terminal, and the opening and closing of the switch circuit is controlled based on whether power is supplied to the non-contact temperature sensor. Sensor abnormality detection method.
JP2004376826A 2004-12-27 2004-12-27 Noncontact temperature sensor and abnormality sensing method for the noncontact temperature sensor Pending JP2006184097A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009024962A (en) * 2007-07-23 2009-02-05 Panasonic Corp Air conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009024962A (en) * 2007-07-23 2009-02-05 Panasonic Corp Air conditioner

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