JP2004134328A - Safety circuit structure of electric warmer using heating element for preventing generation of electromagnetic wave - Google Patents

Safety circuit structure of electric warmer using heating element for preventing generation of electromagnetic wave Download PDF

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Publication number
JP2004134328A
JP2004134328A JP2002334344A JP2002334344A JP2004134328A JP 2004134328 A JP2004134328 A JP 2004134328A JP 2002334344 A JP2002334344 A JP 2002334344A JP 2002334344 A JP2002334344 A JP 2002334344A JP 2004134328 A JP2004134328 A JP 2004134328A
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JP
Japan
Prior art keywords
point
heating element
fuse
electric
electromagnetic wave
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
JP2002334344A
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Japanese (ja)
Inventor
Michio Maeda
前田 通生
Kenji Mizutani
水谷 憲司
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.)
Sankyo Co Ltd
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Sankyo 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 Sankyo Co Ltd filed Critical Sankyo Co Ltd
Priority to JP2002334344A priority Critical patent/JP2004134328A/en
Publication of JP2004134328A publication Critical patent/JP2004134328A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To structure a safety circuit to guarantee safety with respect to a malfunction caused by dielectric breakdown of a heating element (1) in an electric warmer such as an electric carpet and an electric blanket wired by the heating element for preventing generation of electromagnetic waves. <P>SOLUTION: An AC1, a temperature fuse TF(10), a current fuse IF(9), a secondary wire (3). the anode A and cathode K of a silicon controlled rectifier SCR(14), and a primary wire (2) are connected in series in this order, as shown in the circuit diagram of the figure 4. A fixed resistance Ra(12) and a diode D1(13) are connected to a point R and a point S at the both ends of the secondary wire (3) as shown in the figure 4. A diode D2(15) is connected between a point U and a point V at the both ends of a detecting wire (4). A fixed resistance Rb(17) is connected to a point V and a point W. The circuit is thus structured. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
この発明は、電磁波発生を防止する図1のような発熱体(1)を利用して図2のように配線された電気カーペットや電気毛布等の電気採暖具で、この発熱体(1)が絶縁破壊等で故障しても人やものに対して安全性を保障する安全制御回路構成およびその接続方法に関するものである。
【0002】
【従来の技術】
図1の如く、電磁波発生防止発熱体(1)の構造は、一次線(2)、二次線(3)、検地線(4)、一次絶縁層(5)、二次絶縁層(6)、外皮として表皮絶縁層(7)からなっている。
この発熱体(1)が、電磁波発生を防止する原理は、一次線(2)に電流が流れる時同じ電流を逆向きに、しかも同じ構造内で近接して、二次線(3)に流すたため、一次線(2)で発生した電磁波を二次線(3)で発生する電磁波で互いに打消合い、外部に電磁波が発生し難い構造となっている。
従来、この発熱体(1)で配線された電気カーペット、電気毛布等の電気採暖具で、この発熱体が故障して、二次絶縁層(6)が絶縁破壊で二次線(3)と検知線(4)が短絡した場合、検地線(4)の信号が制御回路に伝達され温度ヒューズTF(10)が動作し通電を停止させることが直接にできていた。
しかし、一次絶縁層(5)の絶縁破壊によって、一次線(2)と二次線(3)が短絡した場合、検知線(4)では十分な検知ができなかった。
図3より、X地点で一次絶縁層(5)が絶縁破壊により短絡した場合、AC1→リレー接点RY(11)→電流ヒューズTF(9)→一次線(2)→X地点→二次線(3)→温度ヒューズTF(10)→AC2の経路で短絡電流が流れる。X地点が発熱体(1)の端P点に近い場合、過大な短絡電流により、電流ヒューズIF(9)が動作し、通電を停止するが、Q側に近い付近では動作せず定格以上の電流が流れる。この為、発熱体(1)のA部からX部までの間は、過大電流により温度が設定温度を超えて、高くなった状態で温度制御が行われ安全性が保障できなかった。
【0003】
【発明が解決しようとする課題】
本発明は、図2のように配線された発熱体(1)の両端P部からQ部のすべての場所で絶縁破壊による短絡現象が生じても、通電を完全に停止させて安全性を保障しようとするものである。
【0004】
【課題を解決するための手段】
いま、その制御回路構成および接続方法を説明すると、
図4の回路図のような接続方法の構成にする。すなわち
(イ)AC1→温度ヒューズTF(10)→電流ヒューズIF(9)→ニ次線(3)→シリコン制御整流素子SCR(14)のアノードA、カソードK→一次線(2)→AC2を直列に接続する。このとき温度ヒューズTF(10)と電流ヒューズIF(9)の位置は逆になってもよい。
また、温度ヒューズTF(10)と電流ヒューズIF(9)の位置は、図4より
▲1▼AC1とR点の間に温度ヒューズTF(10)と電流ヒューズIF(9)がある場合
▲2▼AC2とW点の間に温度ヒューズTF(10)と電流ヒューズIF(9)がある場合
▲4▼AC1とR点の間に温度ヒューズTF(10)があり、かつAC2とW点の間に電流ヒューズIF(9)がある場合
▲5▼AC1とR点の間に電流ヒューズIF(9)があり、かつAC2とW点の間に温度ヒューズTF(10)がある場合
▲6▼AC1とR点の間か又はAC2とW点の間のどちらかに必ず温度ヒューズTF(10)があり、かつT点とW点の間に電流ヒューズIF(9)がある場合
▲1▼から▲6▼のいずれでもよい。
(ロ)二次線(3)の両端R点とS点に図4のように固定抵抗Ra(12)とダイオードD1(13)を接続しておく。位置は逆でもよいが、ダイオードD1(13)の向きは、図4の方向の向きである。
(ハ)検地線(4)の両端U点とV点の間に図4のようにダイオードD2(15)を接続する。
(ニ)V点とW点に固定抵抗Rb(17)を接続する。
以上のような接続方法により,回路を構成する。
【0005】
【発明の実施の形態】
図4のX点で一次絶縁層(5)が破壊し短絡したとき、電流はAC2→W点→T点→一次線(2)→X点→二次線(3)→R点→電流ヒューズIF(9)→温度ヒューズTF(10)→AC1の経路で流れる。
このとき同時にS点とR点の間に電圧が発生するため、X点→S点→ダイオードD1(13)→固定抵抗Ra(12)→R点の経路で電流が流れて、固定抵抗Ra(12)が発熱する。
この固定抵抗Ra(12)は温度ヒューズTF(10)と一体構造であるため固定抵抗Ra(12)の発熱により、温度ヒューズ(10)が断線する。
このことにより、発熱体(1)への通電を停止し、安全を保障する。
また、二次絶縁層(6)のY点で絶縁破壊し、短絡したときは、AC2→W点→固定抵抗Rb(17)→V点→検知線(4)又はダイオードD2(15)→検知線(4)→Y点→二次線(3)→R点→電流ヒューズIF(9)→温度ヒューズTF(10)→AC2の経路で電流が流れ、固定抵抗Rb(17)が発熱する。この固定抵抗Rb(17)も温度ヒューズ(10)と一体構造になっているためこの固定抵抗Rb(17)の発熱により、温度ヒューズTF(10)が断線し発熱体(1)へ通電を停止する。
このようにして、安全性を保障しようとするものである。
【0006】
【発明の効果】
以上のようなものであるから、
(イ)発熱体(1)の一次絶縁層(5)がP地点からQ地点のどの箇所で絶縁破壊しても通電を停止させ安全が保障できる。
(ロ)発熱体(1)のニ次絶縁層(6)がP地点からQ地点のどの箇所で絶縁破壊しても通電を停止させ安全が保障できる。
(ハ)余分な部品を使用せず、複雑な制御も必要なく、安価ですむ。
(ニ)絶縁破壊による短絡電流に対する安全性が保障でき安心して使用できる。
【図面の簡単な説明】
【図1】電磁波発生防止発熱体の構造図
【図2】電気カーペット、電気毛布等の電気採暖具の配線外観図
【図3】従来の制御回路装置機構の図
【図4】本発明の安全制御回路構成およびその接続方法の図
【符号の説明】
1.電磁波発生防止発熱体     10.温度ヒューズTF
2.一次線            11.リレー接点RY
3、二次線            12.固定抵抗Ra
4.検地線            13.ダイオードD1
5.一次絶縁層          14.シリコン制御整流素子SCR
6.二次絶縁層          15.ダイオードD2
7.表皮絶縁層          16.ダイオードD3
8.リモコン           17.固定抵抗Rb
9.電流ヒューズIF
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric heating device such as an electric carpet or an electric blanket wired as shown in FIG. 2 using a heating element (1) as shown in FIG. 1 for preventing generation of electromagnetic waves. The present invention relates to a safety control circuit configuration that guarantees safety for a person or an object even if a failure occurs due to insulation breakdown or the like, and a connection method thereof.
[0002]
[Prior art]
As shown in FIG. 1, the structure of the heating element (1) for preventing electromagnetic wave generation includes a primary line (2), a secondary line (3), a ground line (4), a primary insulating layer (5), and a secondary insulating layer (6). And a skin insulating layer (7) as an outer skin.
The principle of the heating element (1) preventing generation of electromagnetic waves is that when the current flows through the primary line (2), the same current flows in the opposite direction, and close to the same structure, to the secondary line (3). Therefore, the electromagnetic waves generated by the primary wire (2) are canceled by each other by the electromagnetic waves generated by the secondary wire (3), so that the electromagnetic wave is hardly generated outside.
Conventionally, with an electric heating device such as an electric carpet or an electric blanket wired with the heating element (1), the heating element fails and the secondary insulating layer (6) breaks down with the secondary wire (3) due to dielectric breakdown. When the detection line (4) is short-circuited, the signal of the detection line (4) is transmitted to the control circuit, and the temperature fuse TF (10) operates to stop the energization directly.
However, when the primary wire (2) and the secondary wire (3) were short-circuited due to dielectric breakdown of the primary insulating layer (5), the detection wire (4) could not sufficiently detect.
According to FIG. 3, when the primary insulating layer (5) is short-circuited due to dielectric breakdown at the point X, AC1 → relay contact RY (11) → current fuse TF (9) → primary line (2) → point X → secondary line ( 3) A short-circuit current flows through the path of → temperature fuse TF (10) → AC2. When the point X is close to the end point P of the heating element (1), the current fuse IF (9) operates due to an excessive short-circuit current and stops energization, but does not operate near the Q side and exceeds the rating. Electric current flows. For this reason, during the period from the part A to the part X of the heating element (1), the temperature exceeds the set temperature due to the excessive current, and the temperature is controlled in a high state, so that safety cannot be guaranteed.
[0003]
[Problems to be solved by the invention]
The present invention guarantees safety by completely stopping energization even if a short-circuit phenomenon due to dielectric breakdown occurs at all places from the P end to the Q end of the heating element (1) wired as shown in FIG. What you are trying to do.
[0004]
[Means for Solving the Problems]
Now, the control circuit configuration and connection method will be described.
The connection method is configured as shown in the circuit diagram of FIG. That is, (a) AC1 → temperature fuse TF (10) → current fuse IF (9) → secondary line (3) → anode A and cathode K of silicon controlled rectifier SCR (14) → primary line (2) → AC2. Connect in series. At this time, the positions of the temperature fuse TF (10) and the current fuse IF (9) may be reversed.
Also, the positions of the thermal fuse TF (10) and the current fuse IF (9) are shown in FIG. 4 as follows: {circle around (1)} when the thermal fuse TF (10) and the current fuse IF (9) are located between the point AC1 and the point R; ▼ When there is a thermal fuse TF (10) and a current fuse IF (9) between AC2 and W point. 4) There is a thermal fuse TF (10) between AC1 and R point, and between AC2 and W point. When there is a current fuse IF (9) in the current state; (5) when there is a current fuse IF (9) between the AC1 and the R point; and when there is a temperature fuse TF (10) between the AC2 and the W point. When the temperature fuse TF (10) is always located between the point R and the point R or between the point AC2 and the point W and the current fuse IF (9) is located between the point T and the point W, Any of 6 ▼ may be used.
(B) A fixed resistor Ra (12) and a diode D1 (13) are connected to both ends R and S of the secondary line (3) as shown in FIG. Although the position may be reversed, the direction of the diode D1 (13) is the direction of the direction of FIG.
(C) A diode D2 (15) is connected between points U and V at both ends of the ground line (4) as shown in FIG.
(D) A fixed resistor Rb (17) is connected to points V and W.
A circuit is configured by the above connection method.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
When the primary insulating layer (5) is broken and short-circuited at point X in FIG. 4, the current is AC2 → W point → T point → primary line (2) → X point → secondary line (3) → R point → current fuse It flows through the path of IF (9) → temperature fuse TF (10) → AC1.
At this time, a voltage is simultaneously generated between the point S and the point R, so that a current flows through a path from the point X, the point S, the diode D1 (13), the fixed resistor Ra (12), and the point R, and the fixed resistor Ra 12) generates heat.
Since the fixed resistor Ra (12) has an integral structure with the thermal fuse TF (10), the heat generated by the fixed resistor Ra (12) breaks the thermal fuse (10).
As a result, energization of the heating element (1) is stopped to ensure safety.
When the dielectric breakdown occurs at the Y point of the secondary insulating layer (6) and a short circuit occurs, AC2 → W point → fixed resistance Rb (17) → V point → detection line (4) or diode D2 (15) → detection A current flows through the line (4) → point Y → secondary line (3) → point R → current fuse IF (9) → temperature fuse TF (10) → AC2, and the fixed resistor Rb (17) generates heat. Since the fixed resistor Rb (17) also has an integral structure with the thermal fuse (10), the heat generated by the fixed resistor Rb (17) causes the thermal fuse TF (10) to be disconnected and the power supply to the heating element (1) is stopped. I do.
In this way, security is to be guaranteed.
[0006]
【The invention's effect】
Because of the above,
(A) Even if the primary insulating layer (5) of the heating element (1) breaks down at any point from the point P to the point Q, the current is stopped and the safety can be guaranteed.
(B) Even if the secondary insulating layer (6) of the heating element (1) breaks down at any point from the point P to the point Q, energization is stopped to ensure safety.
(C) No extra parts are used, no complicated control is required, and the cost is low.
(D) Safety against short-circuit current due to insulation breakdown can be guaranteed, and it can be used with confidence.
[Brief description of the drawings]
FIG. 1 is a structural diagram of a heating element for preventing generation of electromagnetic waves. FIG. 2 is an external view of wiring of an electric heating device such as an electric carpet and an electric blanket. FIG. 3 is a diagram of a conventional control circuit device mechanism. FIG. Diagram of control circuit configuration and connection method [Description of reference numerals]
1. Electromagnetic wave generation prevention heating element 10. Thermal fuse TF
2. Primary line 11. Relay contact RY
3. Secondary line 12. Fixed resistance Ra
4. Ground line 13. Diode D1
5. Primary insulating layer 14. Silicon controlled rectifier SCR
6. Secondary insulating layer 15. Diode D2
7. Skin insulating layer 16. Diode D3
8. Remote control 17. Fixed resistance Rb
9. Current fuse IF

Claims (1)

図1の構造をした電磁波発生防止発熱体(1)が配線された電気カーペット、電気毛布等の電気採暖具において、発熱体(1)を図4のように接続して回路を構成してなる発熱体(1)の故障に対する安全制御回路構成およびその接続方法。In an electric heater such as an electric carpet, an electric blanket or the like, to which an electromagnetic wave generation preventing heating element (1) having the structure shown in FIG. 1 is wired, the heating element (1) is connected as shown in FIG. 4 to constitute a circuit. A safety control circuit configuration for a failure of the heating element (1) and a connection method thereof.
JP2002334344A 2002-10-12 2002-10-12 Safety circuit structure of electric warmer using heating element for preventing generation of electromagnetic wave Pending JP2004134328A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002334344A JP2004134328A (en) 2002-10-12 2002-10-12 Safety circuit structure of electric warmer using heating element for preventing generation of electromagnetic wave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002334344A JP2004134328A (en) 2002-10-12 2002-10-12 Safety circuit structure of electric warmer using heating element for preventing generation of electromagnetic wave

Publications (1)

Publication Number Publication Date
JP2004134328A true JP2004134328A (en) 2004-04-30

Family

ID=32290256

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002334344A Pending JP2004134328A (en) 2002-10-12 2002-10-12 Safety circuit structure of electric warmer using heating element for preventing generation of electromagnetic wave

Country Status (1)

Country Link
JP (1) JP2004134328A (en)

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