JPS6032957B2 - Electric heater safety device - Google Patents
Electric heater safety deviceInfo
- Publication number
- JPS6032957B2 JPS6032957B2 JP14744277A JP14744277A JPS6032957B2 JP S6032957 B2 JPS6032957 B2 JP S6032957B2 JP 14744277 A JP14744277 A JP 14744277A JP 14744277 A JP14744277 A JP 14744277A JP S6032957 B2 JPS6032957 B2 JP S6032957B2
- Authority
- JP
- Japan
- Prior art keywords
- heater
- safety device
- container
- output
- comparator
- 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
Landscapes
- Control Of Resistance Heating (AREA)
Description
【発明の詳細な説明】
本発明は電気調理器等の安全装置に関し、特にヒータと
容器間の絶縁が劣化したことを検知し、ヒータへの電源
供給を遮断し、使用者を感電の危険から保護する安全装
置を提供しようとするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for electric cookers, etc., and in particular detects that the insulation between the heater and the container has deteriorated, cuts off the power supply to the heater, and protects the user from the risk of electric shock. It is intended to provide a safety device to protect the user.
従来、ヒータの絶縁劣化を検知する電気加熱器の安全装
置として第１図に示すものが用いられていた。Conventionally, a safety device shown in FIG. 1 has been used as a safety device for electric heaters that detects insulation deterioration of the heater.
この第１図において、１はヒータであり、このヒータ１
とＩＪレー接点２の直列回路にダイオード３、抵抗４、
コンデンサ５の直列回路が並列接続され、コンデンサ５
にリレーコイル６およびサィリスタ７が並列接続されて
いる。このサィリスタ７のゲート極は高抵抗８を介して
容器９に接続されている。この回路の両端１０，１１に
電源を接続し、電圧を印加すると、リレーコイル６に電
流が流れリレー接点２が閉じる。この時ヒータ１と容器
９間の絶縁抵抗が４・さしくと、ヒーター−容器９一高
抵抗８を介してサイリスタ７のゲート極に電流が流れ、
サィリス夕７をオンする。このため、リレーコイル６に
電圧が印加されずＩＪレー接点２が開放し、ヒータ１へ
の通電が断たれる。上記従来の電気加熱器の安全装置は
端子１０を電源の高圧側に、端子１１の電源を低圧側に
接続しなければならず、極性が逆になると正常な動作を
しないという欠点があった。また、ヒータ１に通電した
後に絶縁劣化を検出するため通電の瞬間に感電する危険
があった。本発明は上記従来の電気加熱器の安全装置の
欠点を解消するもので以下に本発明の一実施例について
説明する。In this FIG. 1, 1 is a heater, and this heater 1
and IJ relay contact 2, diode 3, resistor 4,
The series circuit of capacitor 5 is connected in parallel, and the capacitor 5
A relay coil 6 and a thyristor 7 are connected in parallel. The gate electrode of this thyristor 7 is connected to a container 9 via a high resistance 8. When a power source is connected to both ends 10 and 11 of this circuit and a voltage is applied, a current flows through the relay coil 6 and the relay contact 2 closes. At this time, if the insulation resistance between the heater 1 and the container 9 is 4, a current flows to the gate electrode of the thyristor 7 via the heater-container 9 and the high resistance 8.
Turn on Siris Yu7. Therefore, no voltage is applied to the relay coil 6, the IJ relay contact 2 is opened, and the power to the heater 1 is cut off. The conventional electric heater safety device described above has the disadvantage that the terminal 10 must be connected to the high voltage side of the power source and the power source of the terminal 11 must be connected to the low voltage side, and if the polarity is reversed, it will not work properly. Furthermore, since insulation deterioration is detected after the heater 1 is energized, there is a risk of electric shock at the moment of energization. The present invention eliminates the drawbacks of the conventional safety devices of electric heaters, and one embodiment of the present invention will be described below.
交流電源に接続される端子２１，２２間に電源トランス
２３の一次巻線が接続され、この一次巻線にスイッチ２
４、コイル２５、ヒータ２６、コイル２７、スイッチ２
８の直列回路が並列援続されている。電源トランス２３
の二次巻線には整流器２９を介してコンデンサ３０が接
続されている。このコンデンサ３０‘こ発振器３１、抵
抗３２と抵抗３３の直列回路、比較器３４がそれぞれ並
列接続されている。発振器３１の一方の出力端子はヒー
タ２６とコイル２７の接続点に接続され、他方の出力端
子はコンデンサ３６を介して比較器３４の一方の入力端
子に接続されている。このコンデンサ３５には抵抗３６
とダイオード３７の直列回路が並列接続され、この抵抗
３６とダイオード３７の接続点はヒータ２６の近傍に位
置する容器３８に接続されている。３９は比較器３４の
出力端子に接続されたりレーコィルであり、比較器３４
の出力が高レベルであると駆動し、スイッチ２４，２８
を閉成し、比較器３４の出力が低レベルであると駆動を
停止し、スイッチ２４，２８を開放する。A primary winding of a power transformer 23 is connected between terminals 21 and 22 connected to an AC power supply, and a switch 2 is connected to this primary winding.
4, coil 25, heater 26, coil 27, switch 2
Eight series circuits are connected in parallel. Power transformer 23
A capacitor 30 is connected through a rectifier 29 to the secondary winding. This capacitor 30', an oscillator 31, a series circuit of resistors 32 and 33, and a comparator 34 are connected in parallel. One output terminal of the oscillator 31 is connected to a connection point between the heater 26 and the coil 27, and the other output terminal is connected to one input terminal of a comparator 34 via a capacitor 36. This capacitor 35 has a resistor 36
A series circuit consisting of a resistor 36 and a diode 37 are connected in parallel, and a connection point between the resistor 36 and the diode 37 is connected to a container 38 located near the heater 26 . 39 is a Ray coil connected to the output terminal of the comparator 34;
When the output of
is closed, and if the output of the comparator 34 is at a low level, the drive is stopped and the switches 24 and 28 are opened.
上記構成において、電源トランス２３、整流器２９、コ
ンデンサ３０１こより直流電源回路が構成され、抵抗３
２，３３，３６、コンデンサ３５、ダイオード３７、比
較器３４により検知回路が構成され、リレーコイル３９
、スイッチ２４，２８により遮断器が構成されている。
なお、コイル２５，２７は発振器３１の出力が電源側に
入力されるのを防止するためのものである。次に上記構
成における動作について説明する。端子２１，２２間に
交流電源を接続すると直流電源回路の出力端子、すなわ
ちコンデンサ３０の両端に直流電圧が出力され、発振器
３１および比較器３４に印加される。また、抵抗３２と
抵抗３３の接続点の電圧は比較器３４の一方の入力端子
に基準電圧として入力される。発振器３１の一方の出力
端子は抵抗３６の一端に接続され、他方の力端子はヒー
タ２６の一端に接続されており、ヒータ２６と容器３８
間の絶縁抵抗が大きいと抵抗３６の両端の電圧は基準電
圧よりも小さく比較器３４の他方の入力端子に入力され
て、比較器３４の出力は高レベルとなる。このためリレ
ーコイル３９が駆動し、スイッチ２４，２８を閉成し、
ヒータ２６へ通電が行なわれる。ヒータ２６と容器３８
間の絶縁抵抗が小さいと、発振器３１の出力はヒータ２
６および容器３８を介して抵抗３６の両端にそのまま現
れ、この抵抗３６の両端の電圧は基準電圧よりも大きく
、比較器３４の他方の入力端子に入力されて比較器３４
の出力は低レベルとなる。このためリレーコイル３９は
駆動せずスイッチ２４，２８は開放状態のままであり、
ヒータ２６への通電は行われない。なお、本実施例にお
いて検知回路に比較器を用いて電圧比較を行っているが
、電流比較、位相比較を行う構成としても良い。In the above configuration, a DC power supply circuit is composed of the power transformer 23, the rectifier 29, and the capacitor 301, and the resistor 3
2, 33, 36, a capacitor 35, a diode 37, and a comparator 34 constitute a detection circuit, and a relay coil 39
, switches 24 and 28 constitute a circuit breaker.
Note that the coils 25 and 27 are for preventing the output of the oscillator 31 from being input to the power supply side. Next, the operation in the above configuration will be explained. When an AC power source is connected between the terminals 21 and 22, a DC voltage is output to the output terminal of the DC power circuit, that is, across the capacitor 30, and is applied to the oscillator 31 and the comparator 34. Further, the voltage at the connection point between the resistors 32 and 33 is inputted to one input terminal of the comparator 34 as a reference voltage. One output terminal of the oscillator 31 is connected to one end of the resistor 36, and the other power terminal is connected to one end of the heater 26, and the heater 26 and the container 38 are connected to each other.
If the insulation resistance between them is large, the voltage across the resistor 36 will be lower than the reference voltage and will be input to the other input terminal of the comparator 34, and the output of the comparator 34 will be at a high level. Therefore, the relay coil 39 is driven, closing the switches 24 and 28,
The heater 26 is energized. Heater 26 and container 38
If the insulation resistance between the oscillator 31 and the heater 2
6 and the container 38, the voltage across the resistor 36 is greater than the reference voltage, and is input to the other input terminal of the comparator 34.
output will be at a low level. Therefore, the relay coil 39 is not driven and the switches 24 and 28 remain open.
The heater 26 is not energized. In this embodiment, a comparator is used in the detection circuit to perform voltage comparison, but a configuration may also be adopted in which current comparison and phase comparison are performed.
ごやた遮断器としてリレーコイル以外に半導体スイッチ
等各種の遮断器を用いることができる。以上の説明から
明らかなように、本発明の電気加熱器の安全装置は、負
荷であるヒータに通電を行う前にヒータと容器間の絶縁
劣化を検知してヒータへの通電を行わなくするので感電
の危険が全く無く、さらに電源に接続される端子の極性
には無関係で作動するので使用勝手が良く、実用価値の
大なるものである。In addition to relay coils, various circuit breakers such as semiconductor switches can be used as the goyata circuit breaker. As is clear from the above explanation, the electric heater safety device of the present invention detects insulation deterioration between the heater and the container before energizing the heater, which is the load, and stops energizing the heater. There is no risk of electric shock, and since it operates regardless of the polarity of the terminal connected to the power supply, it is easy to use and has great practical value.
第１図は従来の電気加熱器の安全装置の電気回路図、第
２図は本発明の一実施例を示す電気加熱器の安全装置の
電気回路図である。
２４，２８……スイッチ、２６……ヒータ、３１・・・
・・・発振器、３６・・・・・・抵抗、３４・・・・・
・比較器、３８・・・・・・容器、３９・・・・・・リ
レーコイル。
第２図第１図FIG. 1 is an electric circuit diagram of a conventional safety device for an electric heater, and FIG. 2 is an electric circuit diagram of a safety device for an electric heater showing an embodiment of the present invention. 24, 28... switch, 26... heater, 31...
...Oscillator, 36...Resistor, 34...
・Comparator, 38... Container, 39... Relay coil. Figure 2 Figure 1
Claims (1)
ヒータにより加熱される容器と、前記ヒータと前記容器
間および抵抗に出力を印加する発振器と、このヒータと
容器間に印加された前記発振器の出力を検知する検知手
段と、この検知手段の出力により前記スイツチを開閉し
前記ヒータへの通電を制御する遮断器とを備えてなる電
気加熱器の安全装置。1 A heater connected to an AC power source via a switch,
A container heated by a heater, an oscillator that applies an output between the heater and the container and to a resistor, a detection means for detecting the output of the oscillator applied between the heater and the container, and an output of the detection means A safety device for an electric heater, comprising a circuit breaker that opens and closes the switch and controls energization to the heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14744277A JPS6032957B2 (en) | 1977-12-07 | 1977-12-07 | Electric heater safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14744277A JPS6032957B2 (en) | 1977-12-07 | 1977-12-07 | Electric heater safety device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5479843A JPS5479843A (en) | 1979-06-26 |
| JPS6032957B2 true JPS6032957B2 (en) | 1985-07-31 |
Family
ID=15430423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14744277A Expired JPS6032957B2 (en) | 1977-12-07 | 1977-12-07 | Electric heater safety device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6032957B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122861U (en) * | 1990-03-26 | 1991-12-13 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58185156U (en) * | 1982-06-01 | 1983-12-09 | 象印マホービン株式会社 | electric water heater |
-
1977
- 1977-12-07 JP JP14744277A patent/JPS6032957B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122861U (en) * | 1990-03-26 | 1991-12-13 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5479843A (en) | 1979-06-26 |
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