JPH0378756B2 - - Google Patents
Info
- Publication number
- JPH0378756B2 JPH0378756B2 JP22355787A JP22355787A JPH0378756B2 JP H0378756 B2 JPH0378756 B2 JP H0378756B2 JP 22355787 A JP22355787 A JP 22355787A JP 22355787 A JP22355787 A JP 22355787A JP H0378756 B2 JPH0378756 B2 JP H0378756B2
- Authority
- JP
- Japan
- Prior art keywords
- heating element
- indicator lamp
- energization indicator
- energization
- circuit
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 54
- 230000007423 decrease Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Control Of Resistance Heating (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、露結防止あるいは凍結防止等の用途
に用いられる自己温度制御型発熱体に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a self-temperature-controlled heating element used for purposes such as preventing dew condensation or preventing freezing.
（従来の技術）
発熱体への通電の有無を表示する通電表示ラン
プ付発熱体が、例えば水道管等の凍結防止用発熱
体などで商品化されている。しかし、これらの通
電表示ランプ付の発熱体は、発熱体の通電加熱の
制御をサーモスタツトを設けて行う方式のもので
ある。このようなサーモスタツトを設けた通電表
示ランプ付発熱体の１例を第２図に示す。第２図
において、１′は金属線或いは金属箔等の発熱体
で、この発熱体１′と直列にサーモスタツト８が
接続され、サーモスタツト８と発熱体１′との間
に発熱体１′と並列に通電表示ランプ６が接続さ
れている。この通電表示ランプ６は交流電源で点
灯する放電管が一般に用いられる。２は交流電源
で通常AC100V電圧である。７は通電表示ランプ
６の保護用抵抗である。このようなサーモスタツ
ト制御縮方式の発熱体では、予め所定の温度に設
定されたサーモスタツト８のON、OFF作動によ
り発熱体１′への通電が制御される。従つて、発
熱体１′への通電の有無はサーモスタツト８の
ON、OFFを通電表示ランプ６の点灯、消灯で検
出することにより容易に行われる。(Prior Art) A heating element with an energization indicator lamp that indicates whether or not the heating element is energized has been commercialized, for example, as a heating element for preventing freezing of water pipes and the like. However, these heating elements equipped with energization indicator lamps are of a type in which a thermostat is provided to control the energization and heating of the heating element. An example of a heating element with an energization indicator lamp equipped with such a thermostat is shown in FIG. In FIG. 2, 1' is a heating element such as a metal wire or metal foil, and a thermostat 8 is connected in series with this heating element 1'. An energization indicator lamp 6 is connected in parallel with the energization indicator lamp 6 . This energization indicator lamp 6 is generally a discharge tube that is lit by an AC power source. 2 is an AC power supply, which is usually 100V AC. 7 is a protective resistor for the energization indicator lamp 6. In such a thermostatically controlled heating element, the supply of electricity to the heating element 1' is controlled by turning on and off the thermostat 8, which is set to a predetermined temperature in advance. Therefore, whether or not the heating element 1' is energized depends on the thermostat 8.
ON/OFF is easily detected by turning on/off the energization indicator lamp 6.
（発明が解決しようとする問題点）
発熱体として、前述のサーモスタツト付発熱体
の他に高分子重合体組成物にカーボンブラツク等
の導電性粒子を分散含有せしめた半導電性重合体
組成物をシート状に形成し、これに電極線を設け
た自己温度制御型発熱体が用いられている。この
自己温度制御型発熱体の場合は発熱体自身が温度
制御機能を有し、発熱体の温度が上昇するに伴い
電気抵抗が増大して電流が減少し、発熱体の発熱
量が減少するという、所謂正の抵抗温度係数を有
するものであり、サーモスタツトを不用としたも
のである。しかし、かかる自己温度制御型発熱体
においても、発熱体の抵抗値が何等かの原因で所
定の抵抗値範囲を越えて上昇し発熱体の発熱能力
に不足をきたし発熱体の機能を十分に果し得ない
状況が発生した場合、或は季節的に発熱体に通電
するような使われ方をするような場合にあつて
は、発熱体への通電状態を容易にしかも早期に発
見する必要がある。このような必要性から通電状
態の表示可能な自己温度制御型発熱体の開発が強
く要請されていた。しかし、自己温度制御型発熱
体の場合、電源が入力されている限り、電流量の
多少はあつても発熱体には常に電流が流れている
ため、従来からのサーモスタツト付発熱体のよう
に発熱体への通電状態を電源の印加の有無のみで
検出表示する方法は採用できない。(Problems to be Solved by the Invention) As a heating element, in addition to the above-mentioned heating element with a thermostat, a semiconductive polymer composition in which conductive particles such as carbon black are dispersed in a polymer composition. A self-temperature-controlled heating element is used, which is formed into a sheet shape and provided with electrode wires. In the case of this self-temperature-controlled heating element, the heating element itself has a temperature control function, and as the temperature of the heating element rises, the electrical resistance increases, the current decreases, and the amount of heat generated by the heating element decreases. , which has a so-called positive temperature coefficient of resistance and eliminates the need for a thermostat. However, even in such a self-temperature-controlled heating element, the resistance value of the heating element may rise beyond a predetermined resistance value range for some reason, resulting in insufficient heat generation capacity of the heating element, and the function of the heating element may not be fully performed. If an unexpected situation occurs, or if the device is used in a way that energizes the heating element seasonally, it is necessary to easily and early detect whether the heating element is energized. be. Due to these needs, there has been a strong demand for the development of a self-temperature-controlled heating element that can display the energized state. However, in the case of a self-temperature-controlled heating element, as long as the power is input, current is always flowing through the heating element, even if the amount of current is small, so it cannot be used like a conventional heating element with a thermostat. It is not possible to adopt a method of detecting and displaying the energization state of the heating element based only on whether or not power is applied.
（問題点を解決するための手段）
本発明は、自己温度制御型発熱体と直列に通電
表示ランプ回路を設け、発熱体の抵抗値が所定範
囲にあるときは通電表示ランプ回路の両端に表示
ランプを点灯させるに十分な電位差を生ぜしめ、
この電圧を表示ランプに印加点灯させ、一方発熱
体の抵抗値が所定範囲を越え増大したときは通電
表示ランプ回路両端の電位差が表示ランプ点灯動
作電圧より低くなるよう構成し前述の問題点の解
決を図つたものである。(Means for solving the problem) The present invention provides an energization indicator lamp circuit in series with a self-temperature-controlled heating element, and when the resistance value of the heating element is within a predetermined range, an indicator is displayed at both ends of the energization indicator lamp circuit. Creates a potential difference sufficient to light the lamp,
This voltage is applied to the indicator lamp to turn it on, and when the resistance value of the heating element increases beyond a predetermined range, the potential difference between both ends of the energized indicator lamp circuit is configured to be lower than the indicator lamp lighting operating voltage, which solves the above-mentioned problem. This is what we are trying to achieve.
（作用及び実施例）
本発明の通電表示ランプ回路を設けた自己温度
制御型発熱体の１実施例を第１図に示す。１は自
己温度制御型発熱体であり３は通電表示ランプ回
路である。通電表示ランプ回路３は互いに並列に
接続される３つの分岐直列回路からなる。即ち通
電表示用の発光ダイオード（LED）４とその保
護抵抗R1とを直列接続した第１の分岐回路と
LED４と極性方向を一致させたダイオードD1と
D2及び抵抗R2とが直列接続された第２の分岐回
路と、LED４と極性を逆方向に接続したダイオ
ードD3からなる第３の分岐回路をそれぞれ並列
接続して形成される。かかる通電表示ランプ回路
３を設けた発熱体１に交流電源（通常AC100V）
２が印加され、発熱体１の抵抗値が所定範囲にあ
つて正常な発熱状態にあるときは、交流電源電圧
がＡ点で＋、Ｃ点で−の印加状態となつたとき
は、電流はダイオードD1，D2及び抵抗R2の直列
回路とLED４と保護抵抗R1の直列回路とに分流
する。このとき、抵抗R1とR2の値をR2≪R1に設
定し、LED４には点灯動作電流程度の微小電流
（mA程度）が流れる程度とすれば、電源電流の
大部分はダイオードD1，D2と抵抗R2の直列回路
に流れ、通電表示ランプ回路の両端Ａ，Ｂ間には
ダイオードD1，D2の順方向電圧降下分と抵抗R2
による電圧降下分との和の電位差が発生する。こ
の電位差がLED４の点灯動作電圧より十分大き
くなるよう予めダイオードD1，D2及び抵抗R2を
選定し用いれば、この発生電位差がLED４と抵
抗R1の直列回路両端に印加され、LED４が点灯
する。また、交流電源電圧がＡ点で−、Ｃ点で＋
に逆転したときは、電流はＢ点からＡ点方向に流
れ、ダイオードD3の回路のみに流れるので、
LED４は点灯しない。従つて、LED４は交流電
源２の周波数で点滅を繰り返すが、交流電源２は
通常商用周波数の50HZ，60HZであるので目視上
ではLED４は連続点灯として認識される。また、
ダイオードD3はLED４の逆耐圧保護の機能をも
併せ有するものである。一方、発熱体１の抵抗値
が所定範囲を越え増大し異常状態となつたとき
は、発熱体１に流れる電流は減少し、ダイオード
D1，D2と抵抗R2との直流回路に流れる電流も減
少するため、抵抗R2における電圧降下分が減少
して通電表示ランプ回路両端AB間の電位差は低
下し、LED４に印加される電圧はLED４の点灯
動作電圧以下となつてLED４は点灯しなくなる。
なお、発熱体１が短絡したような異常時は公知の
限流ヒユーズ５を設けて回路遮断を行う。(Function and Examples) FIG. 1 shows an example of a self-temperature-controlled heating element provided with an energization indicator lamp circuit according to the present invention. 1 is a self-temperature-controlled heating element, and 3 is an energization indicator lamp circuit. The energization indicator lamp circuit 3 consists of three branch series circuits connected in parallel to each other. In other words, a first branch circuit in which a light emitting diode (LED) 4 for energization indication and its protective resistor R 1 are connected in series.
Diode D1 whose polarity direction matches that of LED4
A second branch circuit in which D 2 and a resistor R 2 are connected in series, and a third branch circuit in which a diode D 3 is connected in the opposite polarity to the LED 4 are connected in parallel. An alternating current power supply (usually AC 100V) is applied to the heating element 1 provided with the energization indicator lamp circuit 3.
2 is applied, and when the resistance value of the heating element 1 is within the specified range and it is in a normal heating state, when the AC power supply voltage is + at point A and - at point C, the current is The current is divided into a series circuit of diodes D 1 , D 2 and resistor R 2 and a series circuit of LED 4 and protection resistor R 1 . At this time, if the values of resistors R 1 and R 2 are set to R 2 ≪ R 1 , and a minute current (about mA) similar to the lighting operating current flows through LED 4, most of the power supply current will flow through the diode D. 1 , D 2 and the resistor R 2 , and the forward voltage drop of the diodes D 1 , D 2 and the resistor R 2 are present between both ends A and B of the energization indicator lamp circuit.
A potential difference is generated that is the sum of the voltage drop caused by If diodes D 1 , D 2 and resistor R 2 are selected and used in advance so that this potential difference is sufficiently larger than the lighting operating voltage of LED 4, this generated potential difference will be applied to both ends of the series circuit of LED 4 and resistor R 1 , and LED 4 will light up. do. Also, the AC power supply voltage is - at point A and + at point C.
When the current is reversed, the current flows from point B to point A, and flows only through the diode D3 circuit.
LED4 does not light up. Therefore, the LED 4 repeatedly blinks at the frequency of the AC power source 2, but since the AC power source 2 is usually at a commercial frequency of 50 HZ or 60 HZ, the LED 4 is visually recognized as continuously lit. Also,
The diode D3 also has a reverse voltage protection function for the LED4. On the other hand, when the resistance value of the heating element 1 increases beyond the predetermined range and becomes abnormal, the current flowing through the heating element 1 decreases and the diode
Since the current flowing through the DC circuit between D 1 and D 2 and resistor R 2 also decreases, the voltage drop across resistor R 2 decreases, and the potential difference between both ends AB of the energized indicator lamp circuit decreases, which is applied to LED 4. The voltage becomes lower than the lighting operating voltage of LED 4, and LED 4 no longer lights up.
In addition, in the event of an abnormality such as a short circuit in the heating element 1, a known current limiting fuse 5 is provided to interrupt the circuit.
（発明の効果）
上記のように、本発明によれば自己温度制御型
発熱体に通電表示ランプの設置を可能とし、発熱
体が正常に機能しているか否かを早期にしかも容
易に発見して適切な処置が行え、また、発熱体の
電源が必要なときに入つており、不要なときには
切られているか否か目視で容易に認識できるの
で、使用上極めて好便となり機能面での効果は大
なるものがある。(Effects of the Invention) As described above, according to the present invention, it is possible to install an energization indicator lamp on a self-temperature-controlled heating element, and it is possible to quickly and easily discover whether or not the heating element is functioning normally. In addition, it is extremely convenient to use and functionally effective, as it is easy to visually recognize whether the power to the heating element is turned on when needed and turned off when it is not needed. There is something big about it.
第１図は本発明の通電表示回路を設けた自己温
度制御型発熱体の接続回路図、第２図は従来より
用いられているサーモスタツト付発熱体の接続回
路図である。
１……自己温度制御型発熱体、２……交流電
源、３……通電表示ランプ回路、４……LED、
R1，R2……抵抗、D1，D2，D3……ダイオード。
FIG. 1 is a connection circuit diagram of a self-temperature-controlled heating element provided with the energization display circuit of the present invention, and FIG. 2 is a connection circuit diagram of a conventionally used heating element with a thermostat. 1... Self-temperature-controlled heating element, 2... AC power supply, 3... Energization indicator lamp circuit, 4... LED,
R1 , R2 ...Resistor, D1 , D2 , D3 ...Diode.
Claims (1)
熱体において、この発熱体と直列に通電表示ラン
プ回路を設け、該通電表示ランプ回路両端に前記
発熱体に流れる電流に相応する電位差を生ぜし
め、この電位差を通電表示ランプに印加するよう
形成しかつ、前記発熱体の抵抗値が所定範囲にあ
るときは前記通電表示ランプに印加される電位差
が該通電表示ランプの点灯作動電圧より十分に高
く、前記発熱体の抵抗値が前記所定範囲を越える
ときは前記通電表示ランプに印加される電位差が
該通電表示ランプの点灯作動電圧より低くなるよ
う通電表示ランプ回路を構成したことを特徴とす
る自己温度制御型発熱体。1. In a self-temperature-controlled heating element having a positive temperature coefficient of resistance, an energization indicator lamp circuit is provided in series with the heating element, and a potential difference corresponding to the current flowing through the heating element is generated across the energization indicator lamp circuit, The potential difference is formed so as to be applied to the energization indicator lamp, and when the resistance value of the heating element is within a predetermined range, the potential difference applied to the energization indicator lamp is sufficiently higher than the lighting operating voltage of the energization indicator lamp, The energization indicator lamp circuit is configured such that when the resistance value of the heating element exceeds the predetermined range, the potential difference applied to the energization indicator lamp is lower than the lighting operating voltage of the energization indicator lamp. Controlled heating element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22355787A JPS6467884A (en) | 1987-09-07 | 1987-09-07 | Self-temperature control type heating body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22355787A JPS6467884A (en) | 1987-09-07 | 1987-09-07 | Self-temperature control type heating body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6467884A JPS6467884A (en) | 1989-03-14 |
| JPH0378756B2 true JPH0378756B2 (en) | 1991-12-16 |
Family
ID=16800026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22355787A Granted JPS6467884A (en) | 1987-09-07 | 1987-09-07 | Self-temperature control type heating body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6467884A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4766254B2 (en) * | 2006-05-23 | 2011-09-07 | 株式会社Ｌｉｘｉｌ | Heater abnormality detection circuit |
-
1987
- 1987-09-07 JP JP22355787A patent/JPS6467884A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6467884A (en) | 1989-03-14 |
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