JP2008171607A - Heating device - Google Patents
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Abstract
【課題】漏電による事故防止をなくし信頼性の高い加熱装置を提供することを目的とするものである。
【解決手段】漏洩電流を検知する漏電電流検知手段８と、漏電電流検知手段８の検知出力が設定値を超えることにより動作する漏電事故防止手段９とを備えたものである。これによって、漏電電流検知手段８の検知出力が設定値を超えると漏電事故防止手段９である表示手段９ａが動作し、漏電を知らせることにより、漏電が原因で事故等が発生するのを防止し、信頼性の高い加熱装置としている。
【選択図】図１An object of the present invention is to provide a highly reliable heating device that prevents accidents due to electric leakage.
A leakage current detection means 8 for detecting a leakage current and a leakage accident prevention means 9 that operates when a detection output of the leakage current detection means 8 exceeds a set value are provided. As a result, when the detection output of the leakage current detection means 8 exceeds the set value, the display means 9a as the leakage accident prevention means 9 operates to notify the leakage, thereby preventing the occurrence of an accident due to the leakage. It is a reliable heating device.
[Selection] Figure 1
Description
本発明は、漏電事故防止対策を施した誘導加熱調理器等の加熱装置に関するものである。 The present invention relates to a heating apparatus such as an induction heating cooker in which measures for preventing electric leakage accidents have been taken.
従来から２００Ｖで使用する誘導加熱調理器等の加熱装置は、漏電による感電や火災事故等の防止のためにアース処理がなされている（例えば、特許文献１参照）。
しかしながら、前記従来の構成では、アース処理のみであり漏電による感電や火災事故等の防止が万全なものとは言い難いものである。 However, in the above-described conventional configuration, only earthing is performed, and it is difficult to say that prevention of electric shock or fire accident due to electric leakage is thorough.
本発明は、前記従来の課題を解決するものであり、漏電による事故防止をなくし信頼性の高い加熱装置を提供することを目的とするものである。 An object of the present invention is to solve the above-described conventional problems, and to provide a highly reliable heating apparatus that eliminates accident prevention due to electric leakage.
前記従来の課題を解決するために、本発明の加熱装置は、漏洩電流を検知する漏電電流検知手段と、漏電電流検知手段の検知出力が設定値を超えることにより動作する漏電事故防止手段とを備えたものである。 In order to solve the above-described conventional problems, the heating device of the present invention includes a leakage current detection unit that detects a leakage current, and a leakage accident prevention unit that operates when the detection output of the leakage current detection unit exceeds a set value. It is provided.
これによって、漏電電流検知手段の検知出力が設定値を超えると漏電事故防止手段が動作し、漏電を知らせたり、電力供給を遮断したりする等して、漏電が原因で事故等が発生するのを防止し、信頼性の高い加熱装置としている。 As a result, when the detection output of the leakage current detection means exceeds the set value, the leakage accident prevention means operates, causing an accident or the like due to the leakage by notifying the leakage or cutting off the power supply. This is a reliable heating device.
本発明の加熱装置は、漏電による事故防止をなくし信頼性の高い加熱装置を提供できる。 The heating device of the present invention can provide a highly reliable heating device by preventing accidents due to electric leakage.
第１の発明は、加熱手段と、漏洩電流を検知する漏電電流検知手段と、漏電電流検知手段の漏洩電流検知により動作する漏電事故防止手段と、加熱手段の制御と漏電電流検知手段の検知出力が設定値を超えることにより漏電事故防止手段を動作するように制御する制御手段とを備えた加熱装置とすることにより、漏電電流検知手段の検知出力が設定値を超えると漏電事故防止手段が動作し、漏電を知らせたり、電力供給を遮断したりする等して、漏電が原因で事故等が発生するのを防止し、信頼性の高い加熱装置としている。 The first invention is a heating means, a leakage current detection means for detecting a leakage current, a leakage accident prevention means that operates by detecting a leakage current of the leakage current detection means, a control of the heating means, and a detection output of the leakage current detection means. When the detected output of the leakage current detection means exceeds the set value, the leakage accident prevention means operates when the heating device is provided with a control means for controlling the leakage accident prevention means to operate when the value exceeds the set value. Therefore, it is possible to prevent an accident or the like from occurring due to a leakage current by notifying a leakage current or shutting off the power supply, thereby providing a highly reliable heating device.
第２の発明は、特に、第１の発明において、漏電事故防止手段は、漏電を知らせる表示手段であることにより、漏電電流検知手段の出力が設定値を超えると表示手段による表示で使用者は漏電を知ることができ、漏電事故を未然に防止できる。 According to a second aspect of the invention, in particular, in the first aspect of the invention, the leakage accident prevention means is a display means for informing about leakage, so that when the output of the leakage current detection means exceeds a set value, the display is displayed by the display means. It is possible to know the leakage and prevent the leakage accident.
第３の発明は、特に、第１の発明において、漏電事故防止手段は、加熱手段への電力供給を遮断する電源オフ手段であることにより、漏電電流検知手段の出力が設定値を超えると漏電電源オフ手段により電力供給を遮断することができ、漏電事故を未然に防止できる。 According to a third aspect of the invention, in particular, in the first aspect of the invention, the leakage accident prevention means is a power-off means for cutting off the power supply to the heating means, so that if the output of the leakage current detection means exceeds the set value, The power supply can be cut off by the power off means, and a leakage accident can be prevented beforehand.
第４の発明は、特に、第１の発明において、漏電事故防止手段は、漏電を知らせる表示手段と加熱手段への電力供給を遮断する電源オフ手段であり、制御手段は漏電電流検知手段の出力が第１の設定値を超えることにより表示手段を動作させ、第１の設定値よりも大きな第２の設定値を超えることにより電源オフ手段を動作させるように制御することにより、信頼性高く漏電事故を未然に防止できる。 According to a fourth aspect of the present invention, in particular, in the first aspect of the invention, the leakage accident prevention means is a power-off means for cutting off the power supply to the display means and the heating means for notifying leakage, and the control means is an output of the leakage current detection means. By controlling the display means to operate when the value exceeds the first set value and to operate the power-off means when the second set value larger than the first set value is exceeded, the leakage current can be reliably increased. Accidents can be prevented.
第５の発明は、特に、第１〜第４のいずれか１つの発明において、漏電電流検知手段は、接地線に流れる電流を検知するようにしたことにより、漏電検知を確実に行うことができ、漏電事故を未然に防止できる。 In the fifth invention, in particular, in any one of the first to fourth inventions, the leakage current detection means can detect the leakage current reliably by detecting the current flowing in the ground line. , Leakage accidents can be prevented.
第６の発明は、特に、第１〜第４のいずれか１つの発明において、漏電電流検知手段は、電源供給線に流れる電流の差を検知するようにしたことにより、漏電検知を確実に行うことができ、漏電事故を未然に防止できる。 In particular, according to a sixth aspect of the present invention, in any one of the first to fourth aspects of the invention, the leakage current detection means reliably detects the leakage by detecting a difference in current flowing through the power supply line. Can prevent electric leakage accidents.
流れる電流の差を検知する漏電電流検知手段を有し、漏電電流検知手段の出力が第一の設定値よりも多ければ表示手段にエラー表示を行い、漏電電流検知手段の出力が第一の設定値よりも大きい第二の設定値よりも多ければ、電源オフ手段により交流電源からの電力供給を遮断することで、漏電事故を未然に防止できる。 It has a leakage current detection means that detects the difference in flowing current, and if the output of the leakage current detection means is greater than the first set value, an error is displayed on the display means, and the output of the leakage current detection means is the first setting. If it is larger than the second set value that is larger than the value, it is possible to prevent a leakage accident by cutting off the power supply from the AC power supply by the power-off means.
第７の発明は、特に、第１〜第６のいずれか１つの発明において、漏電電流検知手段の漏電電流検知特性は周波数依存性を持ち、周波数が高くなるほど出力を小さくするようにしたことにより、加熱装置として誘導加熱調理器の場合、誘導加熱の高周波電流で漏電機能が動作することを防止し、信頼性の高い漏電電流検知が行える。 According to a seventh invention, in particular, in any one of the first to sixth inventions, the leakage current detection characteristic of the leakage current detection means has frequency dependence, and the output is reduced as the frequency is increased. In the case of an induction heating cooker as a heating device, it is possible to prevent the leakage function from being operated by a high frequency current of induction heating, and to detect a leakage current with high reliability.
以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.
（実施の形態１）
図１は、本発明の実施の形態１における加熱装置として誘導加熱調理器を例示している。
(Embodiment 1)
FIG. 1 illustrates an induction heating cooker as a heating device according to Embodiment 1 of the present invention.
図に示すように、本実施の形態における加熱装置は、交流電源１と、電源スイッチ２と、電流ヒューズ３と、誘導加熱コイルよりなり鍋等を誘導加熱する加熱手段４と、金属の筐体５と、筐体５を接地した接地線６と、カレントトランス７と、カレントトランス７の出力を入力とし、漏電電流を検知する漏電電流検知手段８と、漏電電流検知手段８の漏洩電流検知により動作する漏電事故防止手段９と、加熱手段４の制御と漏電電流検知手段８の検知出力が設定値を超えることにより漏電事故防止手段９を動作するように制御する制御手段１０とを備えている。 As shown in the figure, the heating device in the present embodiment includes an AC power source 1, a power switch 2, a current fuse 3, a heating means 4 comprising an induction heating coil for induction heating a pan and the like, and a metal casing. 5, a grounding wire 6 that grounds the housing 5, a current transformer 7, an output of the current transformer 7, and a leakage current detection means 8 that detects a leakage current, and a leakage current detection of the leakage current detection means 8 A leakage prevention means 9 that operates, and a control means 10 that controls the leakage prevention means 9 to operate when the control of the heating means 4 and the detection output of the leakage current detection means 8 exceed a set value. .
そして、前記漏電事故防止手段９としては、本実施の形態では、漏電を文字等で知らせるエラー表示の表示手段９ａを採用しているが、文字等に代えて音声、ブザー、光等であってもよく、あるいは文字表示等とこれらとの組み合わせであってもよく、漏電を知らせるものであればよく特定の表示手段に限らない。 As the leakage accident prevention means 9, in this embodiment, an error display display means 9a for notifying the leakage by letters is adopted, but instead of letters, voice, buzzer, light, etc. Alternatively, it may be a combination of a character display or the like, and any combination of these may be used as long as it informs of leakage.
以上のように構成された加熱装置について、以下その動作を説明する。 The operation of the heating apparatus configured as described above will be described below.
加熱装置が誘導加熱調理器の場合、内部配線による筐体５への漏電、魚を焼くためのロースターヒータの絶縁劣化による筐体５への漏電等が発生すると、接地線６には漏電電流が流れる。その漏電電流を、カレントトランス７を通じて漏電電流検知手段８が検知し、その検知値が設定値（本実施の形態では２０ｍＡとする）よりも多ければ、制御手段１０は漏電事故防止手段９である表示手段９ａにエラー表示（本実施の形態では「Ｈ８０」とする）を行う。 When the heating device is an induction heating cooker, when a leakage current to the housing 5 due to internal wiring, a leakage current to the housing 5 due to insulation deterioration of the roaster heater for grilling fish, etc., a leakage current is generated in the ground wire 6. Flowing. If the leakage current detection means 8 detects the leakage current through the current transformer 7 and the detected value is larger than the set value (20 mA in the present embodiment), the control means 10 is the leakage accident prevention means 9. An error is displayed on the display means 9a (in this embodiment, “H80”).
このように、本実施の形態では、漏電電流検知手段の検知出力が設定値を超えると漏電事故防止手段９が動作し、すなわち表示手段９ａにより、使用者は漏電を知ることができ、漏電事故を未然に防止できる。 Thus, in this embodiment, when the detection output of the leakage current detection means exceeds the set value, the leakage accident prevention means 9 operates, that is, the display means 9a allows the user to know the leakage and Can be prevented.
（実施の形態２）
図２は、本発明の実施の形態２における加熱装置として誘導加熱調理器を例示している。実施の形態１と同一要素については同一符号を付してその説明を省略する。
(Embodiment 2)
FIG. 2 illustrates an induction heating cooker as a heating device according to Embodiment 2 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
図に示すように、本実施の形態における加熱装置は、漏電電流検知手段８の漏洩電流検知により動作する漏電事故防止手段１１として、加熱手段４への電力供給を遮断するリレーで構成した電源オフ手段１１ａを採用している。本実施の形態では実施の形態１における表示手段９ａに代えて電源オフ手段１１ａが設けてある。 As shown in the figure, the heating device according to the present embodiment is a power-off unit configured by a relay that cuts off the power supply to the heating unit 4 as the leakage accident prevention unit 11 that operates by detecting the leakage current of the leakage current detection unit 8. Means 11a is employed. In the present embodiment, a power-off means 11a is provided in place of the display means 9a in the first embodiment.
以上のように構成された加熱装置について、以下その動作を説明する。 The operation of the heating apparatus configured as described above will be described below.
加熱装置が誘導加熱調理器の場合、内部配線による筐体５への漏電、魚を焼くためのロースターヒータの絶縁劣化による筐体５への漏電等が発生すると、接地線６には漏電電流が流れる。その漏電電流を、カレントトランス７を通じて漏電電流検知手段８が検知し、その検知値が設定値（本実施の形態では２０ｍＡとする）よりも多ければ、制御手段１０は漏電事故防止手段１１である電源オフ手段１１ａをオフし、加熱手段４への電力供給を遮断する。 When the heating device is an induction heating cooker, when a leakage current to the housing 5 due to internal wiring, a leakage current to the housing 5 due to insulation deterioration of the roaster heater for grilling fish, etc., a leakage current is generated in the ground wire 6. Flowing. If the leakage current detection means 8 detects the leakage current through the current transformer 7 and the detected value is larger than the set value (20 mA in the present embodiment), the control means 10 is the leakage accident prevention means 11. The power-off means 11a is turned off and the power supply to the heating means 4 is cut off.
このように、本実施の形態では、漏電電流検知手段の検知出力が設定値を超えると漏電事故防止手段１１が動作し、すなわち電源オフ手段１１ａにより、加熱手段への電力供給を遮断することができ、漏電事故を未然に防止できる。 Thus, in the present embodiment, when the detection output of the leakage current detection means exceeds the set value, the leakage accident prevention means 11 operates, that is, the power supply to the heating means can be interrupted by the power-off means 11a. This can prevent electrical leakage accidents.
（実施の形態３）
図３は、本発明の実施の形態３における加熱装置として誘導加熱調理器を例示している。実施の形態１と同一要素については同一符号を付してその説明を省略する。
(Embodiment 3)
FIG. 3 illustrates an induction heating cooker as a heating device according to Embodiment 3 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
図に示すように、本実施の形態における加熱装置は、漏電電流検知手段８の漏洩電流検知により動作する漏電事故防止手段９と１１の両者を備えている。すなわち、漏電事故防止手段としては漏電を知らせる表示手段９ａと加熱手段４への電力供給を遮断する電源オフ手段１１ａを備えており、制御手段１０は漏電電流検知手段８の検知出力が第１の設定値を超えることにより表示手段９ａを動作させ、第１の設定値よりも大きな第２の設定値を超えることにより電源オフ手段１１ａを動作させるように制御するものである。 As shown in the figure, the heating device in the present embodiment includes both leakage accident prevention means 9 and 11 that operate by leakage current detection of leakage current detection means 8. That is, as a leakage accident prevention means, a display means 9a for notifying leakage and a power-off means 11a for cutting off the power supply to the heating means 4 are provided, and the control means 10 has a detection output of the leakage current detection means 8 as the first output. The display means 9a is operated when the set value is exceeded, and the power-off means 11a is operated when the second set value larger than the first set value is exceeded.
以上のように構成された加熱装置について、以下その動作を説明する。 The operation of the heating apparatus configured as described above will be described below.
加熱装置が誘導加熱調理器の場合、内部配線による筐体５への漏電、魚を焼くためのロースターヒータの絶縁劣化による筐体５への漏電等が発生すると、接地線６には漏電電流が流れる。その漏電電流を、カレントトランス７を通じて漏電電流検知手段８が検知し、その検知値が第１の設定値（本実施の形態では１０ｍＡとする）よりも多ければ、制御手段１０は漏電事故防止手段９である表示手段９ａにエラー表示（本実施の形態では「Ｈ８０」とする）を行う。この結果、使用者は漏電していることがわかり、漏電事故を未然に防止できる。また、その値が第２の設定値（本実施の形態では３０ｍＡとする）よりも多ければ、制御手段１０は漏電事故防止手段１１である電源オフ手段１１ａをオフし、交流電源１からの電力供給を停止する。 When the heating device is an induction heating cooker, when a leakage current to the housing 5 due to internal wiring, a leakage current to the housing 5 due to insulation deterioration of the roaster heater for grilling fish, etc., a leakage current is generated in the ground wire 6. Flowing. If the leakage current detection means 8 detects the leakage current through the current transformer 7 and the detected value is larger than the first set value (10 mA in the present embodiment), the control means 10 detects the leakage accident prevention means. 9 is displayed on the display means 9a (in this embodiment, “H80”). As a result, the user knows that there is a leakage, and can prevent a leakage accident. If the value is larger than the second set value (30 mA in the present embodiment), the control means 10 turns off the power-off means 11a which is the leakage accident prevention means 11, and the power from the AC power supply 1 is turned off. Stop supplying.
このように、本実施の形態では、漏電電流検知手段の検知出力が第１の設定値を超えると漏電事故防止手段９が動作し、すなわち表示手段９ａにより、使用者は漏電を知ることができ、第２の設定値を超えると漏電事故防止手段１１が動作し、すなわち電源オフ手段１１ａにより、加熱手段への電力供給を遮断することができ、信頼性高く漏電事故を未然に防止できる。 As described above, in the present embodiment, when the detection output of the leakage current detection means exceeds the first set value, the leakage accident prevention means 9 operates, that is, the display means 9a allows the user to know the leakage. If the second set value is exceeded, the leakage accident prevention means 11 operates, that is, the power supply to the heating means can be cut off by the power-off means 11a, and the leakage accident can be prevented with high reliability.
（実施の形態４）
図４は、本発明の実施の形態４における加熱装置として誘導加熱調理器を例示している。実施の形態１と同一要素については同一符号を付してその説明を省略する。
(Embodiment 4)
FIG. 4 illustrates an induction heating cooker as a heating device according to Embodiment 4 of the present invention. The same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
図に示すように、本実施の形態における加熱装置は、基本的構成は実施の形態１と同一であるが、漏電電流の検知方法が異なる。 As shown in the figure, the heating apparatus in the present embodiment has the same basic configuration as that of the first embodiment, but differs in the method for detecting the leakage current.
すなわち、筐体５への漏電等が発生すると、接地線６には漏電電流が流れる。その結果、交流電源１から加熱手段４に電力を供給している２本の電源供給線には接地線６に流れた漏電電流分だけ差が生じる。その差を、カレントトランス７を通じて漏電電流検知手段８が検知するようにし、漏電電流検知手段８の検知出力が設定値を超えることにより、制御手段１０が漏電事故防止手段９を動作するように制御するものである。 That is, when a leakage current or the like to the housing 5 occurs, a leakage current flows through the ground wire 6. As a result, there is a difference between the two power supply lines supplying power from the AC power supply 1 to the heating means 4 by the amount of the leakage current flowing through the ground line 6. The difference is detected by the leakage current detection means 8 through the current transformer 7, and when the detection output of the leakage current detection means 8 exceeds the set value, the control means 10 is controlled to operate the leakage accident prevention means 9. To do.
以上のように構成された加熱装置について、以下その動作を説明する。 The operation of the heating apparatus configured as described above will be described below.
加熱装置の動作についても実施の形態１と同様であり、漏電等が発生すると、漏電電流検知手段８は、電源供給線に流れる電流の差を、カレントトランス７を通じて検知し、その検知値が設定値（本実施の形態では２０ｍＡとする）よりも多ければ、制御手段１０は漏電事故防止手段９である表示手段９ａにエラー表示（本実施の形態では「Ｈ８０」とする）を行う。 The operation of the heating device is the same as in the first embodiment. When a leakage occurs, the leakage current detection means 8 detects the difference in current flowing through the power supply line through the current transformer 7, and the detected value is set. If the value is larger than the value (20 mA in the present embodiment), the control means 10 displays an error (referred to as “H80” in the present embodiment) on the display means 9a which is the leakage accident prevention means 9.
このように、本実施の形態では、漏電電流検知手段が電源供給線に流れる電流の差を検知しその検知出力が設定値を超えると漏電事故防止手段９が動作し、すなわち表示手段９ａにより、使用者は漏電を知ることができ、漏電事故を未然に防止できる。 Thus, in the present embodiment, the leakage current detection means detects the difference between the currents flowing in the power supply lines, and when the detected output exceeds the set value, the leakage accident prevention means 9 operates, that is, the display means 9a The user can know the leakage and can prevent the leakage accident.
（実施の形態５）
図５は、本発明の実施の形態５における加熱装置として誘導加熱調理器を例示している。実施の形態２と同一要素については同一符号を付してその説明を省略する。
(Embodiment 5)
FIG. 5 illustrates an induction heating cooker as the heating device according to the fifth embodiment of the present invention. The same elements as those of the second embodiment are denoted by the same reference numerals and the description thereof is omitted.
図に示すように、本実施の形態における加熱装置は、基本的構成は実施の形態２と同一であるが、漏電電流の検知方法が異なる。 As shown in the figure, the heating apparatus in the present embodiment has the same basic configuration as that of the second embodiment, but the method for detecting the leakage current is different.
すなわち、筐体５への漏電等が発生すると、接地線６には漏電電流が流れる。その結果、交流電源１から加熱手段４に電力を供給している２本の電源供給線には接地線６に流れた漏電電流分だけ差が生じる。その差を、カレントトランス７を通じて漏電電流検知手段８が検知するようにし、漏電電流検知手段８の検知出力が設定値を超えることにより、制御手段１０が漏電事故防止手段１１を動作するように制御するものである。 That is, when a leakage current or the like to the housing 5 occurs, a leakage current flows through the ground wire 6. As a result, there is a difference between the two power supply lines supplying power from the AC power supply 1 to the heating means 4 by the amount of the leakage current flowing through the ground line 6. The difference is detected by the leakage current detection means 8 through the current transformer 7, and the control means 10 is controlled to operate the leakage accident prevention means 11 when the detection output of the leakage current detection means 8 exceeds the set value. To do.
以上のように構成された加熱装置について、以下その動作を説明する。 The operation of the heating apparatus configured as described above will be described below.
加熱装置の動作についても実施の形態１と同様であり、漏電等が発生すると、漏電電流検知手段８は、電源供給線に流れる電流の差を、カレントトランス７を通じて検知し、その検知値が設定値（本実施の形態では２０ｍＡとする）よりも多ければ、制御手段１０は漏電事故防止手段１１である電源オフ手段１１ａをオフし、加熱手段４への電力供給を遮断する。 The operation of the heating device is the same as in the first embodiment. When a leakage occurs, the leakage current detection means 8 detects the difference in current flowing through the power supply line through the current transformer 7, and the detected value is set. If it is larger than the value (20 mA in this embodiment), the control means 10 turns off the power-off means 11a, which is the leakage accident prevention means 11, and cuts off the power supply to the heating means 4.
このように、本実施の形態では、漏電電流検知手段が電源供給線に流れる電流の差を検知しその検知出力が設定値を超えると漏電事故防止手段１１が動作し、すなわち電源オフ手段１１ａにより、加熱手段への電力供給を遮断することができ、漏電事故を未然に防止できる。 As described above, in the present embodiment, when the leakage current detection means detects the difference in current flowing through the power supply line and the detection output exceeds the set value, the leakage accident prevention means 11 operates, that is, by the power-off means 11a. The power supply to the heating means can be cut off, and a leakage accident can be prevented beforehand.
（実施の形態６）
図６は、本発明の実施の形態６における加熱装置として誘導加熱調理器を例示している。実施の形態３と同一要素については同一符号を付してその説明を省略する。
(Embodiment 6)
FIG. 6 illustrates an induction heating cooker as a heating device according to Embodiment 6 of the present invention. The same elements as those of the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.
図に示すように、本実施の形態における加熱装置は、基本的構成は実施の形態３と同一であるが、漏電電流の検知方法が異なる。 As shown in the figure, the heating device in the present embodiment has the same basic configuration as that of the third embodiment, but the method for detecting the leakage current is different.
すなわち、筐体５への漏電等が発生すると、接地線６には漏電電流が流れる。その結果、交流電源１から加熱手段４に電力を供給している２本の電源供給線には接地線６に流れた漏電電流分だけ差が生じる。その差を、カレントトランス７を通じて漏電電流検知手段８が検知するようにし、その検知値が第１の設定値（本実施の形態では１０ｍＡとする）よりも多ければ、制御手段１０は漏電事故防止手段９である表示手段９ａにエラー表示（本実施の形態では「Ｈ８０」とする）を行う。この結果、使用者は漏電していることがわかり、漏電事故を未然に防止できる。また、その値が第２の設定値（本実施の形態では３０ｍＡとする）よりも多ければ、制御手段１０は漏電事故防止手段１１である電源オフ手段１１ａをオフし、交流電源１からの電力供給を停止する。 That is, when a leakage current or the like to the housing 5 occurs, a leakage current flows through the ground wire 6. As a result, there is a difference between the two power supply lines supplying power from the AC power supply 1 to the heating means 4 by the amount of the leakage current flowing through the ground line 6. The difference is detected by the leakage current detection means 8 through the current transformer 7. If the detected value is larger than the first set value (10 mA in the present embodiment), the control means 10 prevents the leakage accident. An error display (in this embodiment, “H80”) is performed on the display means 9a which is the means 9. As a result, the user knows that there is a leakage, and can prevent a leakage accident. If the value is larger than the second set value (30 mA in the present embodiment), the control means 10 turns off the power-off means 11a which is the leakage accident prevention means 11, and the power from the AC power supply 1 is turned off. Stop supplying.
このように、本実施の形態では、漏電電流検知手段が電源供給線に流れる電流の差を検知しその検知出力が第１の設定値を超えると漏電事故防止手段９が動作し、すなわち表示手段９ａにより、使用者は漏電を知ることができ、第２の設定値を超えると漏電事故防止手段１１が動作し、すなわち電源オフ手段１１ａにより、加熱手段への電力供給を遮断することができ、信頼性高く漏電事故を未然に防止できる。 Thus, in the present embodiment, the leakage current prevention means 9 operates when the leakage current detection means detects a difference in current flowing in the power supply line and the detection output exceeds the first set value, that is, the display means. By 9a, the user can know the leakage, and when the second set value is exceeded, the leakage accident prevention means 11 operates, that is, the power supply to the heating means can be cut off by the power-off means 11a. It is possible to prevent leakage accidents with high reliability.
なお、各実施の形態１〜６における漏電電流検知手段８の漏電電流検知特性は周波数依存性を持ち、周波数が高くなるほど出力を小さくするようにすれば、加熱装置として誘導加熱調理器の場合、誘導加熱の高周波電流で漏電機能が動作することを防止し、信頼性の高い漏電電流検知が行える。 In addition, in the case of an induction heating cooker as a heating device, the leakage current detection characteristic of the leakage current detection means 8 in each of the first to sixth embodiments has frequency dependence, and if the output is reduced as the frequency increases, It is possible to prevent the leakage function from being operated by the induction heating high frequency current and to detect the leakage current with high reliability.
以上のように、本発明にかかる加熱装置は、漏電による事故防止をなくし信頼性の高い加熱装置を提供できるので、誘導加熱調理器としてはもちろんのこと加熱源にこだわることなく他の加熱調理器等の加熱装置として適用することができる。 As described above, since the heating device according to the present invention can provide a highly reliable heating device without preventing accidents due to electric leakage, of course, other heating cookers can be used as induction heating cookers without sticking to the heating source. It can be applied as a heating device.
１ 交流電源
４ 加熱手段
５ 筺体
６ 接地線
８ 漏洩電流検知手段
９、１１ 漏電事故防止手段
９ａ 表示手段
１１ａ 電源オフ手段
DESCRIPTION OF SYMBOLS 1 AC power supply 4 Heating means 5 Housing 6 Grounding wire 8 Leakage current detection means 9, 11 Leakage accident prevention means 9a Display means 11a Power off means
Claims (7)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2015069075A (en) * | 2013-09-30 | 2015-04-13 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
| US20210009274A1 (en) * | 2017-04-13 | 2021-01-14 | Gkn Aerospace Services Limited | Electrothermal heater |
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