JP5807161B2 - Induction heating apparatus and rice cooker using the same - Google Patents
Induction heating apparatus and rice cooker using the same Download PDFInfo
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Description
本発明は、一般家庭及びレストランなどで使用される誘導加熱調理器などの誘導加熱装置およびそれを用いた炊飯器に関するもので、詳しくはそのインバータ回路構成と加熱コイル構成に関するものである。 The present invention relates to an induction heating apparatus such as an induction heating cooker used in general households and restaurants, and a rice cooker using the induction heating apparatus, and more particularly to an inverter circuit configuration and a heating coil configuration.
従来、この種の誘導加熱装置のインバータ回路としては、一石共振インバータ回路を用いるのが一般的であり、スイッチング素子としては、大電流・高耐圧のスイッチング素子を用いている。そして高周波インバータより供給される高周波電流によって加熱コイルからは高周波磁界が発生し、被加熱物内には電磁誘導による渦電流が流れ、そのジュール熱のために被加熱物が加熱される。この時、被加熱物への電力制御を行うためには、スイッチング素子の駆動周波数を可変して、電力制御を行っている（例えば、特許文献１参照）。 Conventionally, a monolithic resonant inverter circuit is generally used as an inverter circuit of this type of induction heating apparatus, and a switching element having a large current and a high breakdown voltage is used as a switching element. A high-frequency magnetic field is generated from the heating coil by the high-frequency current supplied from the high-frequency inverter, an eddy current due to electromagnetic induction flows in the heated object, and the heated object is heated by the Joule heat. At this time, in order to perform power control on the object to be heated, power control is performed by changing the drive frequency of the switching element (see, for example, Patent Document 1).
図８は、特許文献１に記載された誘導加熱装置の構成図である。図８に示すように、誘導加熱装置は、高周波インバータ９、前記高周波インバータ９に含まれるスイッチング素子１０、前記スイッチング素子１０の導通、遮断を制御する制御回路１１、高周波インバータ９に接続された誘導加熱コイル１２、炊飯器に用いる被加熱物である鍋１３を備えている。 FIG. 8 is a configuration diagram of the induction heating apparatus described in Patent Document 1. As shown in FIG. 8, the induction heating apparatus includes a high-frequency inverter 9, a switching element 10 included in the high-frequency inverter 9, a control circuit 11 that controls conduction and interruption of the switching element 10, and an induction connected to the high-frequency inverter 9. A heating coil 12 and a pan 13 which is an object to be heated used for a rice cooker are provided.
この構成において、前記高周波インバータ９により供給された高周波電流によって前記誘導加熱コイル１２からは高周波磁界が発生し、電磁誘導による渦電流のために前記炊飯器鍋１３が加熱される。発生した熱によって炊飯器鍋１３内の水や米が加熱される。この時、炊飯器鍋１３への電力制御を行うためには、スイッチング素子１０の駆動周波数を可変させ、炊飯器鍋１３への入力電力の制御を行っている。 In this configuration, a high frequency magnetic field is generated from the induction heating coil 12 by the high frequency current supplied from the high frequency inverter 9, and the rice cooker pan 13 is heated by the eddy current due to electromagnetic induction. Water and rice in the rice cooker pan 13 are heated by the generated heat. At this time, in order to control the power to the rice cooker pan 13, the drive frequency of the switching element 10 is varied to control the input power to the rice cooker pan 13.
しかしながら、前記従来の構成では、高周波インバータ９の入力電圧が大きく異なる環境である例えば、入力電圧が１００Ｖと２００Ｖで各々動作させた場合、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の誘導加熱コイル１２を用いて同じ入力電力を得ようとすると、入力電圧が高い場合は、スイッチング素子１０の駆動周波数が高い領域で動作させる必要があり、スイッチング素子１０の損失が増加してしまうため、入力電圧が異なる環境で動作させる場合は、それぞれの入力電圧に応じた専用の誘導加熱コイル１２を使用して、駆動周波数を上げずに動作させる必要があるという課題を有していた。 However, in the conventional configuration, the input voltage of the high-frequency inverter 9 is greatly different. For example, when the input voltage is operated at 100 V and 200 V, the number of turns and the distance to the object to be heated before and after the input voltage is different. If the same input power is obtained using the same induction heating coil 12, if the input voltage is high, it is necessary to operate in a region where the driving frequency of the switching element 10 is high, and the loss of the switching element 10 increases. Therefore, when operating in an environment where the input voltage is different, there is a problem that it is necessary to operate without increasing the driving frequency by using a dedicated induction heating coil 12 corresponding to each input voltage. It was.
本発明は、前記従来の課題を解決するもので、インバータ回路の入力電圧が大きく異なる環境で動作させた場合においても、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の誘導加熱コイルを用い、更にスイッチング素子の駆動周波数が高い領域で動作させることなく、同じ入力電力を得ることができる誘導加熱装置およびそれを用いた炊飯器を提供することを目的とする。 The present invention solves the above-mentioned conventional problems, and even when operated in an environment where the input voltage of the inverter circuit is greatly different, the induction has the same number of turns and the same distance to the object to be heated before and after the input voltage is different. An object of the present invention is to provide an induction heating apparatus that can obtain the same input power without using a heating coil and operating in a region where the drive frequency of the switching element is high, and a rice cooker using the induction heating apparatus.
前記従来の課題を解決するために、本発明の誘導加熱装置は、入力交流電圧を整流および平滑して直流電圧に変換する整流回路と、被加熱物を加熱する誘導加熱コイルに高周波電流を供給する高周波インバータ回路と、前記高周波インバータ回路に含まれたスイッチング素子と、前記スイッチング素子の導通、遮断を制御する制御回路とを有し、前記誘導
加熱コイルは、中心軸を一致させた第１の誘導加熱コイルと第２の誘導加熱コイルをそれぞれ半径方向に配し、前記制御回路は、前記入力交流電圧または直流電圧の電圧に応じて、前記第１と第２の誘導加熱コイルの接続を切り替える誘導加熱装置であって、前記第１の誘導加熱コイルは、前記第２の誘導加熱コイルより内側に配されると共に、前記第２の誘導加熱コイルよりインダクタンスを小さくした構成としている。
In order to solve the above-mentioned conventional problems, the induction heating apparatus of the present invention supplies a high-frequency current to a rectifier circuit that rectifies and smoothes an input AC voltage to convert it to a DC voltage, and an induction heating coil that heats an object to be heated. A high-frequency inverter circuit, a switching element included in the high-frequency inverter circuit, and a control circuit that controls conduction and interruption of the switching element, wherein the induction heating coil has a first axis aligned with a central axis . An induction heating coil and a second induction heating coil are respectively arranged in the radial direction, and the control circuit switches the connection between the first and second induction heating coils in accordance with the input AC voltage or the DC voltage. An induction heating device, wherein the first induction heating coil is disposed inside the second induction heating coil and is more inductor than the second induction heating coil. It is to have small forming a scan.
これにより、インバータ回路の入力電圧が大きく異なる環境で動作させた場合においても、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の誘導加熱コイルを用いて、それぞれの入力電圧に適した誘導加熱コイルのインダクタンスを得ることができるため、スイッチング素子の駆動周波数が高い領域で動作させることなく、同じ入力電力を得ることが可能となる。 As a result, even when operating in an environment where the input voltage of the inverter circuit is greatly different, using the induction heating coil having the same number of turns and the distance to the object to be heated before and after the input voltage is different, Since a suitable inductance of the induction heating coil can be obtained, the same input power can be obtained without operating the switching element in a region where the driving frequency is high .
特に、被加熱物の底中央部分の第１の誘導加熱コイルの巻き数を少なくしてインダクタンスＬを小さくし、被加熱物の底中央部分の加熱を集中的に行い、被加熱物の底中央部分から半径方向に離れた第２の誘導加熱コイルの巻き数を多くしてインダクタンスＬは大きくして、加熱を抑える等の被加熱物の加熱分布を選定することが可能となる。 In particular, the number of turns of the first induction heating coil in the bottom center portion of the object to be heated is reduced to reduce the inductance L, and the heating of the bottom center portion of the object to be heated is performed intensively. By increasing the number of turns of the second induction heating coil separated from the portion in the radial direction to increase the inductance L, it is possible to select the heating distribution of the object to be heated, such as suppressing heating .
本発明の誘導加熱装置は、インバータ回路の入力電圧が大きく異なる環境で動作させた場合においても、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の誘導加熱コイルを用いて、スイッチング素子の損失を増大させることなく、同じ入力電力を得ることができるため、入力電圧が異なる環境においてスイッチング素子の性能を異なるものを使用したり、それぞれの入力電圧に応じた専用の誘導加熱コイルを用いたりする必要がなくなるため、誘導加熱コイルをそれぞれの入力電圧において共用で使用することが可能となる。 Even when the induction heating device of the present invention is operated in an environment where the input voltage of the inverter circuit is greatly different, using the induction heating coil having the same number of turns and the distance to the object to be heated before and after the input voltage is different, Since the same input power can be obtained without increasing the loss of the switching element, a switching element with a different performance can be used in an environment where the input voltage is different, or a dedicated induction heating coil corresponding to each input voltage. Therefore, the induction heating coil can be used in common at each input voltage.
第１の発明は、入力交流電圧を整流および平滑して直流電圧に変換する整流回路と、被加熱物を加熱する誘導加熱コイルに高周波電流を供給する高周波インバータ回路と、前記高周波インバータ回路に含まれたスイッチング素子と、前記スイッチング素子の導通、遮断を制御する制御回路とを有し、前記誘導加熱コイルは、中心軸を一致させた第１の誘導加熱コイルと第２の誘導加熱コイルをそれぞれ半径方向に配し、前記制御回路は、前記入力交流電圧または直流電圧の電圧に応じて、前記第１と第２の誘導加熱コイルの接続を切り替える誘導加熱装置であって、前記第１の誘導加熱コイルは、前記第２の誘導加熱コイ
ルより内側に配されると共に、前記第２の誘導加熱コイルよりインダクタンスを小さくしたものである。
A first invention includes a rectifier circuit that rectifies and smoothes an input AC voltage to convert it to a DC voltage, a high-frequency inverter circuit that supplies a high-frequency current to an induction heating coil that heats an object to be heated, and the high-frequency inverter circuit A switching circuit and a control circuit for controlling conduction and blocking of the switching element, and the induction heating coil includes a first induction heating coil and a second induction heating coil, each having a central axis aligned with each other. Arranged in a radial direction, the control circuit is an induction heating device that switches connection between the first and second induction heating coils in accordance with the input AC voltage or DC voltage, and the first induction The heating coil is the second induction heating coil.
And an inductance smaller than that of the second induction heating coil .
これにより、インバータ回路の入力電圧が大きく異なる環境で動作させた場合においても、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の誘導加熱コイルを用いて、それぞれの入力電圧に適した誘導加熱コイルのインダクタンスを得ることができるため、スイッチング素子の駆動周波数が高い領域で動作させることなく、同じ入力電力を得ることが可能となる。
特に、被加熱物の底中央部分の第１の誘導加熱コイルの巻き数を少なくしてインダクタンスＬを小さくし、被加熱物の底中央部分の加熱を集中的に行い、被加熱物の底中央部分から半径方向に離れた第２の誘導加熱コイルの巻き数を多くしてインダクタンスＬは大きくして、加熱を抑える等の被加熱物の加熱分布を選定することが可能となる。
As a result, even when operating in an environment where the input voltage of the inverter circuit is greatly different, using the induction heating coil having the same number of turns and the distance to the object to be heated before and after the input voltage is different, Since a suitable inductance of the induction heating coil can be obtained, the same input power can be obtained without operating the switching element in a region where the driving frequency is high.
In particular, the number of turns of the first induction heating coil in the bottom center portion of the object to be heated is reduced to reduce the inductance L, and the heating of the bottom center portion of the object to be heated is performed intensively. By increasing the number of turns of the second induction heating coil separated from the portion in the radial direction to increase the inductance L, it is possible to select the heating distribution of the object to be heated, such as suppressing heating .
第２の発明は、第１の発明の制御回路において、入力交流電圧または直流電圧が所定の電圧値以上の場合は複数の誘導加熱コイルを直列に接続し、入力交流電圧または直流電圧が所定の電圧値未満の場合は複数の誘導加熱コイルを並列に接続するとしたものである。 According to a second invention, in the control circuit of the first invention, when the input AC voltage or DC voltage is equal to or higher than a predetermined voltage value, a plurality of induction heating coils are connected in series, and the input AC voltage or DC voltage is predetermined. When it is less than the voltage value, a plurality of induction heating coils are connected in parallel.
これにより、入力電圧に適した誘導加熱コイルのインダクタンスを得ることができる。 Thereby, the inductance of the induction heating coil suitable for the input voltage can be obtained.
第３の発明は、第１または２の発明の複数の誘導加熱コイルを直列または並列に接続した場合の前記スイッチング素子の駆動周波数を所定の範囲としたものである。 In a third aspect of the present invention, the driving frequency of the switching element when the plurality of induction heating coils of the first or second aspect of the invention are connected in series or in parallel is set within a predetermined range.
これにより、入力交流電圧または直流電圧がそれぞれ異なる場合においても、スイッチング素子の駆動周波数が同程度の範囲で駆動させることができるため、スイッチング素子の性能をそれぞれの電圧で変えたり、スイッチング素子の駆動周波数が高くなり、スイッチング素子の損失を増大させたりすることがなくなる。 As a result, even when the input AC voltage or DC voltage is different, the switching element drive frequency can be driven within the same range, so the performance of the switching element can be changed by each voltage, or the switching element drive The frequency is not increased, and the loss of the switching element is not increased.
第４の発明は、第１〜３のいずれか１つの発明の誘導加熱装置を備えた炊飯器である。 4th invention is the rice cooker provided with the induction heating apparatus of any one invention of 1st- 3rd .
これにより、入力電圧が異なる環境において、同一の炊飯器で提供することが可能となる。 Thereby, in the environment where input voltages differ, it becomes possible to provide with the same rice cooker.
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）
以下、本発明の実施の形態１について説明する。図１は本発明の第１の実施の形態における誘導加熱装置の回路構成図である。図１において、誘導加熱装置は、商用交流電源２１、高周波インバータ回路２２、高周波インバータ回路２２に含まれる整流回路２３、平滑用コンデンサ２４を備えている。
(Embodiment 1)
Embodiment 1 of the present invention will be described below. FIG. 1 is a circuit configuration diagram of an induction heating apparatus according to the first embodiment of the present invention. In FIG. 1, the induction heating apparatus includes a commercial AC power source 21, a high frequency inverter circuit 22, a rectifier circuit 23 included in the high frequency inverter circuit 22, and a smoothing capacitor 24.
誘導加熱コイルは、中心軸Ａを一致させた複数の誘導加熱コイルである第１の誘導加熱コイル２５と第２の誘導加熱コイル２６をそれぞれ半径方向または、中心軸方向に並べて構成している。なお、図１では、第１の誘導加熱コイル２５と第２の誘導加熱コイル２６の配置関係を模式的に表しているため、平面的に表示している。 The induction heating coil is configured by arranging a first induction heating coil 25 and a second induction heating coil 26, which are a plurality of induction heating coils having the same center axis A, in the radial direction or the central axis direction. In addition, in FIG. 1, since the arrangement | positioning relationship of the 1st induction heating coil 25 and the 2nd induction heating coil 26 is represented typically, it has displayed planarly.
第１の誘導加熱コイル２５と第２の誘導加熱コイル２６は入力電圧に応じて第１の誘導加熱コイル２５の端子ｃ、ｄと、第２の誘導加熱コイル２６の端子ｅ、ｆとを回路側の端子ａ、ｂにそれぞれ接続することで直列または並列に切り替えることができる。 The first induction heating coil 25 and the second induction heating coil 26 are circuits that connect the terminals c and d of the first induction heating coil 25 and the terminals e and f of the second induction heating coil 26 according to the input voltage. It can be switched in series or in parallel by connecting to the terminals a and b on the side.
共振用コンデンサ２７は複数の誘導加熱コイルである第１の誘導加熱コイル２５と第２の誘導加熱コイル２６と並列に接続されている。スイッチング素子２８は、第１の誘導加熱コイル２５と第２の誘導加熱コイル２６と直列に接続され、かつ逆導通ダイオードと並列に接続されている。スイッチング素子２８には、大電流・高耐圧のＩＧＢＴを用いている。 The resonance capacitor 27 is connected in parallel with the first induction heating coil 25 and the second induction heating coil 26 which are a plurality of induction heating coils. The switching element 28 is connected in series with the first induction heating coil 25 and the second induction heating coil 26 and is connected in parallel with the reverse conducting diode. The switching element 28 is a large current / high withstand voltage IGBT.
発振回路を含む制御回路２９は、スイッチング素子２８の導通、遮断を制御する。本実施の形態１におけるスイッチング素子２８の駆動周波数は２０〜５０ｋＨｚ程度である。被加熱物３０は炊飯器用鍋などが用いられる。 A control circuit 29 including an oscillation circuit controls conduction and interruption of the switching element 28. The driving frequency of the switching element 28 in the first embodiment is about 20 to 50 kHz. As the object 30 to be heated, a rice cooker pan or the like is used.
交流電圧検出回路３１は交流電圧を検出し、直流電圧検出回路３２は直流電圧を検出する。いずれかの電圧検出値によって、制御回路２９は、第１の誘導加熱コイル２５と第２の誘導加熱コイル２６の接続を直列または、並列に切り替える。切り替える手段としてはリレーなどを用いることで第１の誘導加熱コイル２５と第２の誘導加熱コイル２６の接続をそれぞれ切り替えることが可能である。 The AC voltage detection circuit 31 detects an AC voltage, and the DC voltage detection circuit 32 detects a DC voltage. The control circuit 29 switches the connection between the first induction heating coil 25 and the second induction heating coil 26 in series or in parallel according to any voltage detection value. As a means for switching, the connection of the first induction heating coil 25 and the second induction heating coil 26 can be switched by using a relay or the like.
次に、図２は本発明の第１の実施の形態における誘導加熱装置と比較するための従来の誘導加熱コイルを用いた場合の動作波形図であり、（ａ）は加熱コイルにＡＣ１００Ｖ用加熱コイルを使用した場合の動作波形図、（ｂ）は加熱コイルにＡＣ２００Ｖ用加熱コイルを使用した場合の動作波形図である。 Next, FIG. 2 is an operation waveform diagram in the case of using a conventional induction heating coil for comparison with the induction heating apparatus in the first embodiment of the present invention, and (a) is a heating coil for AC 100V. FIG. 5B is an operation waveform diagram when an AC 200V heating coil is used as the heating coil.
図２において、スイッチング素子２８の電圧電流波形は、従来の誘導加熱コイルを用いた回路構成における通常動作時のスイッチング素子２８のコレクタ‐エミッタ間の電圧（Ｖｃｅ）と、コレクタ電流（Ｉｃ）波形を示している。但しコレクタ電流（Ｉｃ）は逆導通ダイオードに流れる電流も加えて図示している。回路の構成としては、図１の第１の誘導加熱コイル２５のみを用いて、端子ａとｃを、端子ｂとｄを接続した状態である。 In FIG. 2, the voltage / current waveform of the switching element 28 includes the collector-emitter voltage (Vce) and the collector current (Ic) waveform of the switching element 28 during normal operation in a circuit configuration using a conventional induction heating coil. Show. However, the collector current (Ic) is shown in addition to the current flowing through the reverse conducting diode. As a circuit configuration, only the first induction heating coil 25 of FIG. 1 is used, and the terminals a and c are connected to the terminals b and d.
また、入力交流電圧はＡＣ１００ＶとＡＣ２００Ｖであり、使用している誘導加熱コイルは、図２（ａ）では１００Ｖ専用に設計された誘導加熱コイルを使用している。図２（ｂ）では２００Ｖ専用に設計された誘導加熱コイルを使用している。 The input AC voltage is AC100V and AC200V, and the induction heating coil used is an induction heating coil designed exclusively for 100V in FIG. In FIG. 2B, an induction heating coil designed exclusively for 200V is used.
それぞれの誘導加熱コイルの違いは、それぞれの電圧で駆動周波数が２０〜５０ｋＨｚ（今回の例では３０ｋＨｚ）となるように、コイルの巻数が異なっている点である。 The difference between each induction heating coil is that the number of turns of the coil is different so that the driving frequency is 20 to 50 kHz (30 kHz in this example) at each voltage.
ここで、誘導加熱装置に加わる入力電力Ｐについては、次の関係で表せる。Ｐ＝Ｅ２／Ｌ × １／ｆ × Ａとなり、Ｅは入力電圧、Ｌは誘導加熱コイルのインダクタンス、ｆはスイッチング素子の駆動周波数で、Ａは定数である。 Here, the input power P applied to the induction heating device can be expressed by the following relationship. P = E 2 / L × 1 / f × A, where E is the input voltage, L is the inductance of the induction heating coil, f is the driving frequency of the switching element, and A is a constant.
図２（ａ）のように、入力電圧Ｅを１００Ｖとした場合、所定の入力電力Ｐを入れられるようにし、更に駆動周波数ｆを３０ｋＨｚとなるようにするには、誘導加熱コイルのインダクタンスＬをコイルの巻き数で調整する必要がある。 As shown in FIG. 2A, when the input voltage E is set to 100 V, the inductance L of the induction heating coil is set so that the predetermined input power P can be input and the drive frequency f is 30 kHz. It is necessary to adjust the number of turns of the coil.
そして、この誘導加熱コイルを入力電圧２００Ｖで用いると、所定の入力電力Ｐを得るためには、駆動周波数ｆを高くする必要があり、周波数が１００ｋＨｚ以上となることもある。そのため、スイッチング素子の損失が増大してしまう。 When this induction heating coil is used at an input voltage of 200 V, in order to obtain a predetermined input power P, it is necessary to increase the drive frequency f, and the frequency may be 100 kHz or more. Therefore, the loss of the switching element increases.
逆に図２（ｂ）のように、入力電圧Ｅを２００Ｖとした場合、所定の入力電力Ｐを入れられるようにし、更に駆動周波数ｆを３０ｋＨｚとなるようにするには、同様に誘導加熱コイルのインダクタンスＬをコイルの巻き数で調整する必要がある。 On the contrary, as shown in FIG. 2B, when the input voltage E is 200 V, the predetermined input power P can be input and the drive frequency f is set to 30 kHz. It is necessary to adjust the inductance L of the coil by the number of turns of the coil.
そして、この誘導加熱コイルを入力電圧１００Ｖで用いると、所定の入力電力Ｐを得るためには、駆動周波数ｆを下げて駆動させる必要があり、所定の入力電力Ｐが得られなかったりする場合がある。 When this induction heating coil is used at an input voltage of 100 V, in order to obtain a predetermined input power P, it is necessary to drive at a lower drive frequency f, and the predetermined input power P may not be obtained. is there.
このように、入力電圧が異なる場合、駆動周波数を所定の範囲になるよう設定するには、誘導加熱コイルをそれぞれの電圧に応じて調整する必要があった。 Thus, when the input voltages are different, in order to set the drive frequency to be within a predetermined range, it is necessary to adjust the induction heating coil according to each voltage.
しかしながら、本実施の形態である図３のように、２つの誘導加熱コイルを入力電圧に応じて直列または並列に接続を切り替えることで、同じ誘導加熱コイルを用いて駆動周波数を所定の範囲になるように設定することが可能となる。図３は本発明の第１の実施の形態における誘導加熱装置の誘導加熱コイルを用いた場合の動作波形図である。 However, as shown in FIG. 3 which is the present embodiment, by switching the connection of two induction heating coils in series or in parallel according to the input voltage, the drive frequency is within a predetermined range using the same induction heating coil. It becomes possible to set as follows. FIG. 3 is an operation waveform diagram when the induction heating coil of the induction heating apparatus in the first embodiment of the present invention is used.
誘導加熱コイルのインダクタンスＬはコイルの巻き数の二乗に比例するため、直列に接続して巻き数を増やし、インダクタンスＬを大きくすることで、電圧が高い場合でも駆動周波数を上げることなく所定の入力電力を得ることができる。 Since the inductance L of the induction heating coil is proportional to the square of the number of turns of the coil, it is connected in series to increase the number of turns, and the inductance L is increased so that even if the voltage is high, the predetermined input is not increased. Electric power can be obtained.
このように、入力電圧が２倍程度の差であれば、誘導加熱コイルの巻き数を、低い電圧時に、所定の範囲の駆動周波数で動作可能な巻き数とし、この誘導加熱コイルを２つ用いて、入力電圧が低い場合は並列に接続し、入力電圧が高い場合は直列に接続することで、同じ誘導加熱コイルを用いて、駆動周波数も所定の範囲で駆動させることが可能となる。 Thus, if the input voltage is about twice the difference, the number of turns of the induction heating coil is set to the number of turns that can operate at a driving frequency within a predetermined range at a low voltage, and two induction heating coils are used. When the input voltage is low, they are connected in parallel, and when the input voltage is high, they are connected in series, so that the drive frequency can be driven within a predetermined range using the same induction heating coil.
また、誘導加熱コイルの構成としては、図４の本発明の第１の実施の形態における誘導加熱装置の誘導加熱コイルの構成図に示すように、中心軸Ａを一致させた２つの誘導加熱コイルである第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を半径方向に並べた誘導加熱コイルを用いている。この誘導加熱コイルの端子ｃ、ｄ、ｅ、ｆと回路側の端子ａ、ｂとの接続を切り替えることで、２つの誘導加熱コイルを直列または並列に切り替えている。 In addition, as the configuration of the induction heating coil, as shown in the configuration diagram of the induction heating coil of the induction heating apparatus in the first embodiment of the present invention shown in FIG. An induction heating coil in which a first induction heating coil 25 and a second induction heating coil 26 are arranged in the radial direction is used. By switching the connection between the terminals c, d, e, and f of the induction heating coil and the terminals a and b on the circuit side, the two induction heating coils are switched in series or in parallel.
次に、上記構成につき、その作用を説明する。まず被加熱物３０を加熱するために、操作スイッチ等で加熱開始の指示を行い、スイッチング素子２８が制御回路２９からのオン、オフ信号によりスイッチングを行い、第１の誘導加熱コイル２５および第２の誘導加熱コイル２６に流れる高周波電流によって発生する高周波磁界により被加熱物３０が加熱される。 Next, the effect | action is demonstrated about the said structure. First, in order to heat the object 30 to be heated, an instruction to start heating is given by an operation switch or the like, and the switching element 28 performs switching according to an on / off signal from the control circuit 29, and the first induction heating coil 25 and the second The object to be heated 30 is heated by a high frequency magnetic field generated by a high frequency current flowing through the induction heating coil 26.
この時、交流電圧検出回路３１または直流電圧検出回路３２のいずれかを搭載し、交流電圧または、直流電圧のいずれかを検出することで、商用交流電源２１の電圧が１００Ｖの場合、制御回路２９によって、第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を並列に接続する。 At this time, when the voltage of the commercial AC power supply 21 is 100 V by mounting either the AC voltage detection circuit 31 or the DC voltage detection circuit 32 and detecting either the AC voltage or the DC voltage, the control circuit 29 Thus, the first induction heating coil 25 and the second induction heating coil 26 are connected in parallel.
接続を切り替える手段としてはリレーなどを用いることで誘導加熱コイルの接続をそれぞれ切り替えることが可能である。この時、第１の誘導加熱コイル２５と第２の誘導加熱コイル２６の巻き数をスイッチング素子２８の駆動周波数が所定の範囲（例えば２０〜５０ｋＨｚの範囲内と設定。今回は３０ｋＨｚと設定）に収まるようにすれば、商用交流電源２１の電圧が１００Ｖの場合、駆動周波数が３０ｋＨｚで所定の入力電力を得ることができる。 As a means for switching the connection, the connection of the induction heating coil can be switched by using a relay or the like. At this time, the number of turns of the first induction heating coil 25 and the second induction heating coil 26 is set so that the drive frequency of the switching element 28 is within a predetermined range (for example, within a range of 20 to 50 kHz. This time is set to 30 kHz). As long as the voltage falls within the range, when the voltage of the commercial AC power supply 21 is 100 V, predetermined input power can be obtained at a driving frequency of 30 kHz.
また、商用交流電源２１の電圧が２００Ｖの場合は、第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を直列に接続をする。この場合、誘導加熱コイルの巻き数は、並列に接続する時に比べて増大することになり、スイッチング素子２８の駆動周波数が所定の範囲内で、所定の入力電力を得ることができる。 Further, when the voltage of the commercial AC power supply 21 is 200 V, the first induction heating coil 25 and the second induction heating coil 26 are connected in series. In this case, the number of turns of the induction heating coil is increased as compared with the case where the induction heating coils are connected in parallel, and a predetermined input power can be obtained when the driving frequency of the switching element 28 is within a predetermined range.
これにより、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の誘導加熱コイルの構成で、入力電圧が大きく異なる環境で動作させた場合においても、スイッチング素子の駆動周波数を大きく変える必要がないため、スイッチング素子の損失を増大させることなく、同じ入力電力を得ることができる。 As a result, the drive frequency of the switching element is greatly changed even when operated in an environment where the input voltage is greatly different with the structure of the induction heating coil having the same number of turns and the distance to the object to be heated before and after the input voltage is different. Since there is no need, the same input power can be obtained without increasing the loss of the switching element.
また、この時、中心軸Ａを一致させた２つの誘導加熱コイルである第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を半径方向に並べた誘導加熱コイルを２つ並べて並列に接続して用いる場合、図５のように、それぞれの第１の誘導加熱コイル２５と第２の誘導加熱コイル２６の巻き数を変えてインダクタンスＬを異なるように構成することで、それぞれの第１の誘導加熱コイル２５と第２の誘導加熱コイル２６に流れる電流値の割合を変えることも可能である。これにより、例えば、被加熱物３０の底中央部分の第１の誘導加熱コイル２５ａの巻き数を少なくしてインダクタンスＬを小さくし、底中央部分の加熱を集中的に行い、被加熱物３０の底中央部分から半径方向に離れた第２の誘導加熱コイル２６ａの巻き数を多くしてインダクタンスＬは大きくして、加熱を抑える等の被加熱物３０の加熱分布を選定することが可能である。 Further, at this time, two induction heating coils in which the first induction heating coil 25 and the second induction heating coil 26, which are two induction heating coils having the same center axis A, are arranged in the radial direction are arranged in parallel and connected in parallel. As shown in FIG. 5, by changing the number of turns of each of the first induction heating coil 25 and the second induction heating coil 26 so that the inductances L are different, It is also possible to change the ratio of the current value flowing through the induction heating coil 25 and the second induction heating coil 26. Thereby, for example, the number of turns of the first induction heating coil 25a at the bottom center portion of the article 30 to be heated is reduced to reduce the inductance L, and the heating of the bottom center portion is performed intensively. By increasing the number of turns of the second induction heating coil 26a radially away from the bottom center portion to increase the inductance L, it is possible to select the heating distribution of the object to be heated 30 such as suppressing heating. .
また、誘導加熱コイルの構成としては、図６のように中心軸Ａを一致させた同一形状の第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を中心軸方向に上下に積層する構成としてもよい。この第１の誘導加熱コイル２５と第２の誘導加熱コイル２６の端子ｃ、ｄ、ｅ、ｆと回路側の端子ａ、ｂとの接続を切り替えることで、２つの第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を直列または並列に切り替えている。２つの第１の誘導加熱コイル２５と第２の誘導加熱コイル２６間には絶縁体を介したり、また誘導加熱コイルの素線自身を絶縁層で覆ってもよい。 In addition, as a configuration of the induction heating coil, a configuration in which the first induction heating coil 25 and the second induction heating coil 26 having the same shape with the central axis A aligned as shown in FIG. 6 are stacked vertically in the central axis direction. It is good. By switching the connection between the terminals c, d, e, f of the first induction heating coil 25 and the second induction heating coil 26 and the terminals a, b on the circuit side, the two first induction heating coils 25 are switched. And the second induction heating coil 26 are switched in series or in parallel. An insulator may be interposed between the two first induction heating coils 25 and the second induction heating coil 26, or the wires of the induction heating coil themselves may be covered with an insulating layer.
また、第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を中心軸方向に上下に積層する構成とした場合、図７（ａ）〜（ｈ）のように同一形状の誘導加熱コイルではなく上下で形状を変えてもよい。 Moreover, when it is set as the structure which laminates | stacks the 1st induction heating coil 25 and the 2nd induction heating coil 26 up and down in the center axis direction, in the induction heating coil of the same shape as Fig.7 (a)-(h), The shape may be changed up and down.
図７（ａ）、（ｂ）は、中心軸Ａを一致させた第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を中心軸方向に上下に積層し、被加熱物３０に近接している第１の誘導加熱コイル２５の内径が被加熱物３０から遠隔にある第２の誘導加熱コイル２６の内径と同一で、被加熱物３０に近接している第１の誘導加熱コイル２５の外径が被加熱物３０から遠隔にある第２の誘導加熱コイル２６の外形よりも小さい（図７（ａ）参照）、あるいは大きい（図７（ｂ）参照）構成になっている。 7A and 7B, the first induction heating coil 25 and the second induction heating coil 26 having the center axis A aligned with each other are stacked vertically in the direction of the center axis, and are close to the object to be heated 30. The inner diameter of the first induction heating coil 25 is the same as the inner diameter of the second induction heating coil 26 remote from the object to be heated 30, and the first induction heating coil 25 close to the object to be heated 30 has the same inner diameter. The outer diameter is smaller (see FIG. 7A) or larger (see FIG. 7B) than the outer shape of the second induction heating coil 26 remote from the object 30 to be heated.
図７（ｃ）、（ｄ）は、中心軸Ａを一致させた第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を中心軸方向に上下に積層し、被加熱物３０に近接している第１の誘導加熱コイル２５の外径が被加熱物３０から遠隔にある第２の誘導加熱コイル２６の外径と同一で、被加熱物３０に近接している第１の誘導加熱コイル２５の内径が被加熱物３０から遠隔にある第２の誘導加熱コイル２６の内径よりも小さい（図７（ｃ）参照）、あるいは大きい（図７（ｄ）参照）構成になっている。 7C and 7D, the first induction heating coil 25 and the second induction heating coil 26 having the center axis A aligned with each other are stacked vertically in the direction of the center axis and close to the object to be heated 30. The first induction heating coil 25 that has the same outer diameter as the second induction heating coil 26 that is remote from the object to be heated 30 and is close to the object to be heated 30 The inner diameter of 25 is smaller (see FIG. 7 (c)) or larger (see FIG. 7 (d)) than the inner diameter of the second induction heating coil 26 remote from the object 30 to be heated.
図７（ｅ）、（ｆ）は、中心軸Ａを一致させた第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を中心軸方向に上下に積層し、第１の誘導加熱コイル２５の内径と外径が第２の誘導加熱コイル２６の内径と外径より小さく形成され、第１の誘導加熱コイル２５が、被加熱物３０に近接する位置（図７（ｅ）参照）に配されている。また、第２の誘導加熱コイル２６の内径と外径が第１の誘導加熱コイル２５の内径と外径より小さく形成され、第２の誘導加熱コイル２６が、被加熱物３０から遠隔の位置（図７（ｆ）参照）に配されている。 7E and 7F, the first induction heating coil 25 and the second induction heating coil 26 having the central axis A aligned with each other are stacked vertically in the direction of the central axis. The inner diameter and the outer diameter of the second induction heating coil 26 are smaller than the inner diameter and the outer diameter of the second induction heating coil 26, and the first induction heating coil 25 is disposed at a position close to the object to be heated 30 (see FIG. 7E). Has been. Further, the inner diameter and the outer diameter of the second induction heating coil 26 are formed smaller than the inner diameter and the outer diameter of the first induction heating coil 25, and the second induction heating coil 26 is located at a position remote from the object to be heated 30 ( 7 (f)).
図７（ｇ）、（ｈ）は、中心軸Ａを一致させた第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を中心軸方向に上下に積層し、被加熱物３０に近接している第１の誘導加熱コイル２５の内径が被加熱物３０から遠隔にある第２の誘導加熱コイル２６の内径よりも大きく、被加熱物３０に近接している第１の誘導加熱コイル２５の外径が被加熱物３０から遠隔にある第２の誘導加熱コイル２６の外径より小さい（図７（ｇ）参照）、あるいは、被加熱物３０に近接している第１の誘導加熱コイル２５の内径が被加熱物３０から遠隔にある第２の誘導加熱コイル２６の内径よりも小さく、被加熱物３０に近接している第１の誘導加熱コイル２５の外径が被加熱物３０から遠隔にある第２の誘導加熱コイル２６の外径より大きい（図７（ｈ）参照）構成になっている。 7 (g) and 7 (h), the first induction heating coil 25 and the second induction heating coil 26 having the center axis A aligned with each other are stacked vertically in the direction of the center axis, and are close to the object 30 to be heated. The inner diameter of the first induction heating coil 25 is larger than the inner diameter of the second induction heating coil 26 remote from the object to be heated 30, and the first induction heating coil 25 close to the object to be heated 30 The first induction heating coil 25 whose outer diameter is smaller than the outer diameter of the second induction heating coil 26 remote from the object to be heated 30 (see FIG. 7G), or close to the object 30 to be heated. Is smaller than the inner diameter of the second induction heating coil 26 remote from the object to be heated 30, and the outer diameter of the first induction heating coil 25 close to the object to be heated 30 is remote from the object to be heated 30. Larger than the outer diameter of the second induction heating coil 26 in FIG. It has become irradiation) configuration.
尚、第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を中心軸方向に上下に積層する構成とした場合の作用、効果については、前述した第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を半径方向に並べた場合と同様に、入力電圧によって接続を切り替えることで、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の誘導加熱コイルの構成で、入力電圧が大きく異なる環境においても、スイッチング素子の損失を増大させることなく、同じ入力電力を得ることができる。 In addition, about the effect | action and effect at the time of setting it as the structure which laminates | stacks the 1st induction heating coil 25 and the 2nd induction heating coil 26 up and down in the center axis direction, the 1st induction heating coil 25 mentioned above and the 2nd Similar to the case where the induction heating coils 26 are arranged in the radial direction, the connection is switched depending on the input voltage, so that the input heating voltage can be changed with the structure of the induction heating coil having the same number of turns and the distance to the object to be heated before and after the input voltage is different. Even in an environment where the voltages are greatly different, the same input power can be obtained without increasing the loss of the switching element.
尚、本実施の形態では、複数の誘導加熱コイルとして中心軸Ａを一致させた第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を半径方向または、中心軸方向に並べた２つの誘導加熱コイルを用いているが、３つ以上のコイルを用いても良い。 In the present embodiment, the first induction heating coil 25 and the second induction heating coil 26 having the central axis A aligned with each other as a plurality of induction heating coils are arranged in the radial direction or the central axis direction. Although a heating coil is used, three or more coils may be used.
また、本実施の形態では、第１の誘導加熱コイル２５と第２の誘導加熱コイル２６を直列または並列に切り替える際に、入力電圧を検出して、検出した電圧値に応じてリレーなどを使用して切り替えているが、あらかじめ使用する電圧値が確定している場合は、誘導加熱装置を製造する工程において、誘導加熱コイルの端子を、使用する電圧値に応じて直列または、並列に接続しておけば良い。 Moreover, in this Embodiment, when switching the 1st induction heating coil 25 and the 2nd induction heating coil 26 in series or in parallel, an input voltage is detected and a relay etc. are used according to the detected voltage value. However, if the voltage value to be used is determined in advance, in the process of manufacturing the induction heating device, the induction heating coil terminals are connected in series or in parallel according to the voltage value to be used. Just keep it.
この場合の利点としては、それぞれの入力電圧に応じた専用の誘導加熱コイルを用いる必要がなく、誘導加熱コイルをそれぞれの入力電圧において共用で使用することが可能となる。 As an advantage in this case, it is not necessary to use a dedicated induction heating coil corresponding to each input voltage, and the induction heating coil can be used in common at each input voltage.
このように、従来の誘導加熱コイルの構成では、入力電圧が異なる環境で動作させた場合、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の誘導加熱コイルを用いて同じ電力を得ようとすると、スイッチング素子の駆動周波数がそれぞれの電圧で異なり、駆動周波数が高くなりすぎたり、また、駆動周波数が低くなりすぎて、所定の入力電力が得られない場合があったため、それぞれの入力電圧に応じて専用の加熱コイルを用意する必要があった。 Thus, in the conventional induction heating coil configuration, when operated in an environment where the input voltage is different, the same power is used by using the induction heating coil having the same number of turns and the distance to the object to be heated before and after the input voltage is different. Since the driving frequency of the switching element is different for each voltage, the driving frequency becomes too high, or the driving frequency becomes too low to obtain the predetermined input power. It was necessary to prepare a dedicated heating coil according to the input voltage.
しかしながら、本実施の形態においては、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の複数の誘導加熱コイルを用いて入力電圧が異なる環境でも、スイッチング素子の駆動周波数を所定の範囲内におさめて、同一の入力電力を得ることが可能となる。 However, in the present embodiment, the driving frequency of the switching element is set to a predetermined frequency even in an environment where the input voltage is different using a plurality of induction heating coils having the same number of turns and the same distance to the object to be heated before and after the input voltage is different. It is possible to obtain the same input power within the range.
尚、入力電力の制御をスイッチング素子の駆動周波数を可変させてコントロールする本実施の形態で示したような一石共振インバータ回路のような構成において効果がある。 It is to be noted that there is an effect in the configuration like the one-stone resonant inverter circuit as shown in the present embodiment that controls the input power by changing the drive frequency of the switching element.
以上のように、本発明にかかる誘導加熱装置は、入力電圧が異なる前後で巻き数や被加熱物との距離が同一の誘導加熱コイルを用いて、スイッチング素子の駆動周波数を大きく可変させることなく、入力電圧が異なる環境で使用することができ、スイッチング素子の
損失も増大させることがないため、高効率な誘導加熱装置を提供することができ、誘導加熱式炊飯器としてはもちろんのこと、誘導加熱式湯沸かし器、誘導加熱調理器、またはその他の誘導加熱式加熱装置等の用途にも適用できる。
As described above, the induction heating device according to the present invention uses the induction heating coil having the same number of turns and the same distance to the object to be heated before and after the input voltage is different, without greatly changing the drive frequency of the switching element. , Because it can be used in environments with different input voltages and does not increase the loss of switching elements, it can provide a high-efficiency induction heating device, as well as induction heating rice cookers, induction The present invention can also be applied to uses such as a heating water heater, an induction heating cooker, and other induction heating heating devices.
２１ 商用交流電源
２２ 高周波インバータ回路
２３ 整流回路
２４ 平滑用コンデンサ
２５ 第１の誘導加熱コイル
２６ 第２の誘導加熱コイル
２７ 共振用コンデンサ
２８ スイッチング素子
２９ 制御回路
３０ 被加熱物
３１ 交流電圧検出回路
３２ 直流電圧検出回路
21 Commercial AC Power Supply 22 High Frequency Inverter Circuit 23 Rectifier Circuit 24 Smoothing Capacitor 25 First Induction Heating Coil 26 Second Induction Heating Coil 27 Resonance Capacitor 28 Switching Element 29 Control Circuit 30 Heated Object 31 AC Voltage Detection Circuit 32 DC Voltage detection circuit
Claims (4)
被加熱物を加熱する誘導加熱コイルに高周波電流を供給する高周波インバータ回路と、
前記高周波インバータ回路に含まれたスイッチング素子と、
前記スイッチング素子の導通、遮断を制御する制御回路とを有し、
前記誘導加熱コイルは、中心軸を一致させた第１の誘導加熱コイルと第２の誘導加熱コイルをそれぞれ半径方向に配し、
前記制御回路は、前記入力交流電圧または直流電圧の電圧に応じて、前記第１と第２の誘導加熱コイルの接続を切り替える誘導加熱装置であって、
前記第１の誘導加熱コイルは、前記第２の誘導加熱コイルより内側に配されると共に、前記第２の誘導加熱コイルよりインダクタンスを小さくした誘導加熱装置。 A rectifier circuit that rectifies and smoothes the input AC voltage and converts it to a DC voltage;
A high-frequency inverter circuit for supplying a high-frequency current to an induction heating coil for heating an object to be heated;
A switching element included in the high-frequency inverter circuit;
A control circuit for controlling conduction and interruption of the switching element;
The induction heating coil is arranged with a first induction heating coil and a second induction heating coil having a central axis aligned with each other in the radial direction ,
The control circuit is an induction heating device that switches connection of the first and second induction heating coils according to the voltage of the input AC voltage or DC voltage ,
The first induction heating coil is disposed inside the second induction heating coil and has an inductance smaller than that of the second induction heating coil .
The rice cooker provided with the induction heating apparatus of any one of Claim 1 to 3 .
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| JP2020004540A (en) * | 2018-06-26 | 2020-01-09 | 東芝ホームテクノ株式会社 | Electromagnetic induction controller and inductor connected to the same |
| JP7420814B2 (en) * | 2019-01-03 | 2024-01-23 | 佛山市▲順▼▲徳▼区美的▲電▼▲熱▼▲電▼器制造有限公司 | Coil discs and cooking utensils |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50497Y1 (en) * | 1970-08-13 | 1975-01-09 | ||
| JPS61230290A (en) * | 1985-04-05 | 1986-10-14 | 株式会社東芝 | Induction heating cooker |
| JP2865674B2 (en) * | 1988-07-20 | 1999-03-08 | 株式会社東芝 | Electromagnetic cooker |
| JPH09245949A (en) * | 1996-03-12 | 1997-09-19 | Hitachi Home Tec Ltd | Induction heating cooker |
| JP2000340352A (en) * | 1999-05-25 | 2000-12-08 | Toshiba Home Technology Corp | Electromagnetic induction heating device |
| JP4167926B2 (en) * | 2003-04-17 | 2008-10-22 | 日立アプライアンス株式会社 | Electromagnetic induction heating device |
| JP4845432B2 (en) * | 2005-06-30 | 2011-12-28 | 三菱電機株式会社 | Induction heating cooker |
| JP2007080749A (en) * | 2005-09-16 | 2007-03-29 | Hitachi Appliances Inc | Induction heating cooking device |
| JP2007199356A (en) * | 2006-01-26 | 2007-08-09 | Konica Minolta Business Technologies Inc | Fixing device of electromagnetic induction heating system, and image forming apparatus equipped therewith |
| JP5005320B2 (en) * | 2006-11-06 | 2012-08-22 | 三菱電機株式会社 | Induction heating device |
| JP5040276B2 (en) * | 2006-11-29 | 2012-10-03 | パナソニック株式会社 | Induction heating cooker |
| JP4366413B2 (en) * | 2007-04-27 | 2009-11-18 | 日立アプライアンス株式会社 | Electromagnetic induction heating device |
-
2013
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| US11166347B2 (en) | 2016-06-07 | 2021-11-02 | Lg Electronics Inc. | Induction heating device |
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