JP2014056684A - Induction heating cooker - Google Patents
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Abstract
Description
本発明は、インバータ方式の誘導加熱調理器に関するものである。 The present invention relates to an inverter type induction heating cooker.
誘導加熱調理器は、インバータから加熱コイルに高周波電流を流し、コイルに近接して配置された金属製の被加熱物に渦電流を発生させ、被加熱物自体の電気抵抗により発熱させる。火を使わないため安全性が高く、被加熱物の温度制御が容易にできることから使い勝手は良い。また、キッチン内の空気を暖めないことから、高気密住宅に適した調理器として認知されている。 The induction heating cooker causes a high-frequency current to flow from an inverter to a heating coil, generates an eddy current in a metal heated object disposed in the vicinity of the coil, and generates heat by the electric resistance of the heated object itself. Because it does not use fire, it is safe and easy to control the temperature of the object to be heated. Moreover, since the air in a kitchen is not heated, it is recognized as a cooking appliance suitable for a high airtight house.
誘導加熱調理器には魚やピザなどを焼くオーブンを搭載したものが一般的である。オーブンは、調理を行った際に臭いや油煙が発生する問題があり、特許文献１に開示されるように、調理器内に臭いや油煙を脱臭する触媒を設け、触媒を通過する油煙を強制的に本体外に排出するための吸引ファンを設けている。 An induction heating cooker is generally equipped with an oven for baking fish or pizza. The oven has a problem that odors and oily smoke are generated when cooking, and as disclosed in Patent Document 1, a catalyst for deodorizing odors and oily smoke is provided in the cooker to force oily smoke passing through the catalyst. In addition, a suction fan is provided for discharging the outside of the main body.
キッチンは、細菌やカビ等の微生物が発生する栄養、水分、温度といった３条件がそろっているため、オーブン調理以外にも空気が汚染される可能性があり、 In the kitchen, there are three conditions such as nutrition, moisture, and temperature generated by microorganisms such as bacteria and mold, so air may be contaminated in addition to cooking in the oven.
特許文献１に開示された従来技術において、脱臭機能を高めるには触媒の量を増やす必要がある。また、触媒の活性化を高めるにはヒータを用いて加熱し高温状態にする必要があるため、触媒が増えた場合には、ヒータの熱量も増やす必要がある。これらにより、オーブン庫内の空間が狭くなる問題がある。 In the prior art disclosed in Patent Document 1, it is necessary to increase the amount of catalyst in order to enhance the deodorizing function. Further, in order to increase the activation of the catalyst, it is necessary to heat it to a high temperature by using a heater. Therefore, when the number of catalysts increases, it is necessary to increase the amount of heat of the heater. As a result, there is a problem that the space in the oven is narrowed.
本発明は、オーブン庫内を狭くせず性能に影響を与えることなく脱臭機能を高めた誘導加熱調理器を提供することである。また、オーブンを搭載しないものにおいても、キッチン内の空気を清浄できる誘導加熱調理器を提供することである。 An object of the present invention is to provide an induction heating cooker having an improved deodorizing function without reducing the inside of the oven cabinet and affecting the performance. Moreover, it is providing the induction heating cooking appliance which can clean the air in a kitchen also in what does not mount oven.
前述の課題は、直流電源と、該直流電源からの直流電圧を交流電圧に変換するインバータを具備する電磁誘導加熱装置であって、前記インバータは、被加熱物を誘導加熱する加熱コイルと、プラズマを生成するプラズマ生成部を備えた誘導加熱調理器によって解決できる。 An object of the present invention is to provide an electromagnetic induction heating apparatus including a DC power source and an inverter that converts a DC voltage from the DC power source into an AC voltage, the inverter including a heating coil that induction-heats an object to be heated, a plasma This can be solved by an induction heating cooker provided with a plasma generation unit for generating the above.
本発明によれば、誘導加熱用インバータの一部を兼用しプラズマ生成機能を付加した誘導加熱調理器を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the induction heating cooking appliance which shared a part of induction heating inverter and added the plasma generation function can be provided.
以下に、図面を参照して、本発明の望ましい実施例を説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
図２は本実施例の誘導加熱調理器の一例を示している。図２に示されている調理器は、トッププレート８０の上に左鍋置部８１、右鍋置部８２、中央鍋置部８３を備え、システムキッチン３００に設置可能なビルトイン型の誘導加熱調理器である。 FIG. 2 shows an example of the induction heating cooker of this embodiment. The cooker shown in FIG. 2 includes a left pot holder 81, a right pot holder 82, and a central pot holder 83 on a top plate 80, and built-in induction heating cooking that can be installed in the system kitchen 300. It is a vessel.
トッププレート８０には上面表示部８４、上面操作部８５が配置され、上面操作部８５はガラス製のトッププレート８０を指でタッチするだけで操作できるようになっている。そのため、トッププレート８０には凹凸が無く容易に清掃ができ清潔に保つことが可能である。ここに示す調理器には魚やピザを焼くオーブン８６を搭載しており、オーブン８６の隣にはカンガルーポケット式のオーブン操作部８７を備えている。加熱コイル１１やオーブン８６等を駆動する回路はオーブン操作部８７の後方で右鍋置部８２の下方に内蔵され、回路を冷却した空気はトッププレート８０後方にある排気口８８から本体外に排出される。また、オーブン庫内９０で発生した臭いや油煙も後述する触媒を通過した後、排気口８８から本体外に排出される。 An upper surface display unit 84 and an upper surface operation unit 85 are arranged on the top plate 80, and the upper surface operation unit 85 can be operated simply by touching the glass top plate 80 with a finger. Therefore, the top plate 80 is not uneven and can be easily cleaned and kept clean. The cooking device shown here includes an oven 86 for baking fish and pizza, and an oven operating unit 87 of a kangaroo pocket type is provided next to the oven 86. A circuit for driving the heating coil 11, the oven 86, and the like is built behind the oven operation unit 87 and below the right pan placing unit 82, and the air that has cooled the circuit is discharged out of the main body through an exhaust port 88 behind the top plate 80. Is done. Also, odors and oily smoke generated in the oven chamber 90 pass through a catalyst described later, and are then discharged from the exhaust port 88 to the outside of the main body.
図３は、図２の誘導加熱調理器のオーブン８６の断面図を示している。オーブン庫内９０には、上ヒータ９１と下ヒータ９２を備え、受皿９３の上に焼網９４を置いて調理物２００を焼く。オーブン８６には調理物２００を焼いたときに発生する臭いや煙を浄化する空気浄化用触媒９５が設けられている。前述のように触媒は高温状態にすることでその性能が高まるため、オーブン庫内９０には触媒ヒータ９６が配置されている。モータ１５０を駆動し排気ファン１５１を回転させると、ドア８９の下に設けられた吸気口１００から受皿９３の下を介して空気が流入し、調理物２００から発生した臭いや煙は空気浄化用触媒９５を通過した後、空気流路９７を通って排気口８８から外部に排出される。尚、モータ１５０は、排気ファン１５１の反対に設けられた自冷ファン１５２により吸気口１０１から空気を吸い込み冷却される。ここで、空気流路９７には後述するプラズマ生成部７０が配置されており、空気浄化用触媒９５だけでは除去し切れなかった有害成分を除去し、強制的に排気口８８から排気される。 FIG. 3 shows a cross-sectional view of the oven 86 of the induction heating cooker of FIG. The oven chamber 90 is provided with an upper heater 91 and a lower heater 92, and a cooking net 200 is baked by placing a grill 94 on a tray 93. The oven 86 is provided with an air purification catalyst 95 that purifies odors and smoke generated when the cooked product 200 is baked. As described above, since the performance of the catalyst is enhanced by bringing the catalyst into a high temperature state, the catalyst heater 96 is disposed in the oven chamber 90. When the motor 150 is driven and the exhaust fan 151 is rotated, air flows from the air inlet 100 provided under the door 89 through the bottom of the tray 93, and the odor and smoke generated from the cooked product 200 are used for air purification. After passing through the catalyst 95, it passes through the air flow path 97 and is discharged to the outside from the exhaust port 88. The motor 150 is cooled by sucking air from the air inlet 101 by a self-cooling fan 152 provided opposite to the exhaust fan 151. Here, a plasma generation unit 70 to be described later is disposed in the air flow path 97, and harmful components that could not be removed by the air purification catalyst 95 alone are removed, and the air is forcedly exhausted from the exhaust port 88.
図４は本実施例の誘導加熱調理器の他の例を示している。図２と異なる点は、オーブン８６を搭載していない点である。また、トッププレート８０の後方にキッチン内の空気を取り込む吸気口１０２を備えている点である。 FIG. 4 shows another example of the induction heating cooker of this embodiment. The difference from FIG. 2 is that the oven 86 is not mounted. In addition, an air inlet 102 for taking in air in the kitchen is provided behind the top plate 80.
図５は、図４の誘導加熱調理器の基板搭載部の断面図を示している。筐体内１７０には、半導体部品１６１や電子部品１６３を搭載した基板１６０が配置され、半導体部品１６１にはヒートシンク１６２が取り付けられている。冷却ファン１６４は吸気口１０３から空気を取り入れ、ヒートシンク１６２、電子部品１６３を冷やした後、空気流路９７を通って排気口８８から本体外に排気される。尚、ファン１６４を回すことにより、図４の吸気口１０２からも空気が取り込まれる。ここで、空気流路９７にプラズマ生成部７０が配置されており、筐体内１７０に取り込まれた空気は有害成分が除去された後、強制的に排気口８８から本体外に排出される。これにより、キッチン内の空気はプラズマ生成部７０を介して循環することが可能となり、キッチン内の空気を清浄できる。 FIG. 5 shows a cross-sectional view of the substrate mounting portion of the induction heating cooker of FIG. A substrate 160 on which a semiconductor component 161 and an electronic component 163 are mounted is disposed in the housing 170, and a heat sink 162 is attached to the semiconductor component 161. The cooling fan 164 takes in air from the air intake 103 and cools the heat sink 162 and the electronic component 163, and then exhausts the air from the exhaust port 88 through the air flow path 97. Note that air is also taken in from the air inlet 102 of FIG. 4 by turning the fan 164. Here, the plasma generation unit 70 is disposed in the air flow path 97, and the air taken into the housing 170 is forcibly discharged out of the main body from the exhaust port 88 after the harmful components are removed. Thereby, the air in the kitchen can be circulated through the plasma generator 70, and the air in the kitchen can be purified.
図１は、図２または図４で説明した実施例１の誘導加熱調理器の回路構成図であり、鍋載置部８１〜８３に載置された被加熱物（例えば、調理鍋）が加熱コイル１１と磁気結合し被加熱物（調理鍋）に電力が供給されることで、被加熱物（調理鍋）が誘導加熱される。図１において、直流電源１の正電極と負電極間には、パワー半導体で構成されたスイッチング素子５ａと５ｂが直列に接続された第一の上下アーム３が接続されている。スイッチング素子５ａ、５ｂにはそれぞれダイオード６ａ、６ｂが逆方向に並列接続されている。また、スイッチング素子５ａ、５ｂにはそれぞれスナバコンデンサ７ａ、７ｂが並列に接続されている。第一の上下アーム３の出力端子には加熱コイル１１の一端が接続されており、加熱コイル１１の他端と直流電源１の負電極間にはリレー１８を介して第一の共振コンデンサ１２が接続され第一の共振負荷回路５０を構成している。なお、加熱コイル１１と第一の共振コンデンサ１２の直列回路を第一の上下アーム３の出力端子と直流電源１の負電極との間に設けたが、第一の上下アーム３の出力端子と直流電源１の正電極との間に設けても良い。この構成は電流共振型の変形ハーフブリッジ方式インバータとなる。 FIG. 1 is a circuit configuration diagram of the induction heating cooker according to the first embodiment described with reference to FIG. 2 or FIG. 4, and an object to be heated (for example, a cooking pot) placed on the pan placing units 81 to 83 is heated. The object to be heated (cooking pan) is induction-heated by being magnetically coupled to the coil 11 and supplying power to the object to be heated (cooking pan). In FIG. 1, a first upper and lower arm 3 in which switching elements 5 a and 5 b made of a power semiconductor are connected in series is connected between a positive electrode and a negative electrode of a DC power source 1. Diodes 6a and 6b are connected in parallel in the reverse direction to the switching elements 5a and 5b, respectively. Snubber capacitors 7a and 7b are connected in parallel to the switching elements 5a and 5b, respectively. One end of the heating coil 11 is connected to the output terminal of the first upper and lower arm 3, and the first resonance capacitor 12 is connected between the other end of the heating coil 11 and the negative electrode of the DC power supply 1 via a relay 18. The first resonant load circuit 50 is connected and configured. The series circuit of the heating coil 11 and the first resonance capacitor 12 is provided between the output terminal of the first upper and lower arm 3 and the negative electrode of the DC power source 1. It may be provided between the positive electrode of the DC power supply 1. This configuration is a current resonance type modified half-bridge inverter.
第一の上下アーム３の出力端子にはインダクタ２２の一端が接続されており、インダクタ２２の他端と直流電源１の負電極間にはリレー１９を介してプラズマ生成部７０が接続されている。本実施例において、プラズマ生成部７０は、電極７１と７３で誘電体７２を挟み込んだ誘電体バリア放電タイプを用いており、誘電体７２を含む電極７１、７３はキャパシタとみなせるため、交流電圧を印加することで絶縁破壊による放電を維持し、電極間の広い範囲を電離できる。インダクタ２２とプラズマ生成部７０のキャパシタ成分は直列共振回路を構成するため、前述と同様に電流共振型のハーフブリッジ方式インバータとなり、リレー１９をオン状態にし、第一の上下アーム３のスイッチング素子５ａ、５ｂを相補にオンオフすることによって、プラズマ生成部７０に容易に高周波の高電圧を印加することが可能である。 One end of an inductor 22 is connected to the output terminal of the first upper and lower arm 3, and a plasma generator 70 is connected between the other end of the inductor 22 and the negative electrode of the DC power supply 1 via a relay 19. . In this embodiment, the plasma generation unit 70 uses a dielectric barrier discharge type in which a dielectric 72 is sandwiched between electrodes 71 and 73. Since the electrodes 71 and 73 including the dielectric 72 can be regarded as capacitors, an AC voltage is applied. When applied, the discharge due to dielectric breakdown can be maintained, and a wide range between the electrodes can be ionized. Since the inductor 22 and the capacitor component of the plasma generation unit 70 constitute a series resonance circuit, a current resonance type half-bridge inverter is formed as described above, the relay 19 is turned on, and the switching element 5a of the first upper and lower arms 3 is turned on. By turning on and off 5b in a complementary manner, it is possible to easily apply a high-frequency high voltage to the plasma generator 70.
本実施例は、第一の上下アーム３と第一の共振負荷回路５０から構成される誘導加熱用インバータにプラズマ生成部７０を接続した構成であり、第一の上下アーム３を兼用したことによって最小限の追加部品でプラズマ生成機能を付加することできる。 In this embodiment, the plasma generating unit 70 is connected to the induction heating inverter constituted by the first upper and lower arms 3 and the first resonant load circuit 50, and the first upper and lower arms 3 are also used. A plasma generation function can be added with a minimum of additional parts.
また、プラズマ生成部７０を排気口８８の近傍に設けることで、清浄な空気をキッチンに排気することができる。 Further, by providing the plasma generation unit 70 in the vicinity of the exhaust port 88, clean air can be exhausted to the kitchen.
図６は、実施例２の誘導加熱調理器の回路構成図である。実施例１の図１と同一部分については同一符号を付しており説明は省略する。 FIG. 6 is a circuit configuration diagram of the induction heating cooker according to the second embodiment. The same portions as those in FIG. 1 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
図６において、図１と異なる点は、直流電源１の正電極と負電極間に、パワー半導体スイッチング素子５ｃと５ｄが直列に接続された第二の上下アーム４が接続され、第一の上下アーム３と第二の上下アーム４の出力端子間に、直列接続された加熱コイル１１と第二の共振コンデンサ１３からなる第二の共振負荷回路６０が接続されている点である。スイッチング素子５ｃ、５ｄにはそれぞれダイオード６ｃ、６ｄが逆方向に並列接続されている。また、スイッチング素子５ｃ、５ｄにはそれぞれスナバコンデンサ７ｃ、７ｄが並列に接続されている。 6 is different from FIG. 1 in that a second upper and lower arm 4 in which power semiconductor switching elements 5c and 5d are connected in series is connected between the positive electrode and the negative electrode of the DC power source 1, and the first upper and lower arms are connected. The second resonance load circuit 60 including the heating coil 11 and the second resonance capacitor 13 connected in series is connected between the output terminals of the arm 3 and the second upper and lower arms 4. Diodes 6c and 6d are connected in parallel in the reverse direction to the switching elements 5c and 5d, respectively. Snubber capacitors 7c and 7d are connected in parallel to the switching elements 5c and 5d, respectively.
ここで、加熱コイル１１と被加熱物（図示せず）は磁気的に結合するため、被加熱物を加熱コイル１１側からみた等価回路に変換すると、被加熱物の等価抵抗と等価インダクタンスが直列に接続された構成になる。等価抵抗及び等価インダクタンスは、被加熱物の材質によって異なり、非磁性体で低抵抗の銅やアルミの場合は等価抵抗及び等価インダクタンスのどちらも小さくなり、磁性体で高抵抗の鉄の場合はどちらも大きくなる。被加熱物の加熱電力は表皮抵抗と起磁力に比例するため、非磁性体を加熱するには周波数を高め、起磁力を大きくする必要がある。起磁力を大きくする方法としては、電流を増やす方法と加熱コイル１１の巻数を増やす方法があるが、回路の損失は電流の２乗に比例して増加するため、電流を増やすことは得策ではない。そこで、加熱コイル１１の巻数を増やす方法が取られる。しかしながら、磁性体の被加熱物では元々抵抗が大きいため、非磁性体の被加熱物に合わせて巻数を増やした場合は、等価抵抗が大きくなり共振負荷回路には電流が流れ難くなる。本実施例は、フルブリッジ方式のインバータ構成となり出力電圧を高めることができるため、磁性体の被加熱物にも所望の電力を供給することができる。 Here, since the heating coil 11 and the object to be heated (not shown) are magnetically coupled, when the object to be heated is converted into an equivalent circuit viewed from the side of the heating coil 11, the equivalent resistance and equivalent inductance of the object to be heated are in series. It becomes the configuration connected to. Equivalent resistance and equivalent inductance vary depending on the material of the object to be heated, both non-magnetic and low resistance copper and aluminum both reduce equivalent resistance and equivalent inductance, and both magnetic and high resistance iron. Also grows. Since the heating power of the object to be heated is proportional to the skin resistance and the magnetomotive force, it is necessary to increase the frequency and increase the magnetomotive force in order to heat the non-magnetic material. As a method of increasing the magnetomotive force, there are a method of increasing the current and a method of increasing the number of turns of the heating coil 11. However, since the loss of the circuit increases in proportion to the square of the current, it is not a good idea to increase the current. . Therefore, a method of increasing the number of turns of the heating coil 11 is taken. However, since the resistance of the magnetic material to be heated is originally high, when the number of turns is increased in accordance with the non-magnetic material to be heated, the equivalent resistance increases and current does not easily flow through the resonant load circuit. Since the present embodiment has a full-bridge inverter configuration and can increase the output voltage, it is possible to supply desired power to a magnetic object to be heated.
次に、図７、図８を用いて、動作を説明する。図７、図８は、本実施例における各素子のオンオフ状態を表している。図７において、第一の上下アーム３のスイッチング素子５ａと第二の上下アーム４のスイッチング素子５ｄが同時にオン状態となる期間と、第一の上下アーム３のスイッチング素子５ｂと第二の上下アーム４のスイッチング素子５ｃが同時にオン状態となる期間とを繰り返すことにより、共振負荷回路６０にはスイッチング周波数の交流電圧が印加され、加熱コイル１１には高周波電流が流れ誘導加熱が行なわれる。すなわち、フルブリッジ動作によって誘導加熱が行なわれる。また、リレー１９がオン状態であり、第一の上下アーム３のスイッチング素子５ａ、５ｂの相補駆動によって、プラズマ生成部７０に高周波電圧が印加されるためプラズマが発生する。すなわち、ハーフブリッジ動作によってプラズマ生成が行なわれる。ここで、誘導加熱電力を制御する方法としては、インバータを容易にソフトスイッチング動作できるパルス周波数制御（ＰＦＭ）が一般的であるが、本実施例においては、プラズマの生成を同時に行なうため、第一の上下アーム３と第二の上下アーム４に位相差を設けて駆動する位相シフト制御が望ましい。すなわち、第一の上下アーム３のスイッチング素子５ａと５ｂはデッドタイムを設けてほぼ５０％のオン時間Ｄｕｔｙで駆動することで、プラズマ生成部７０に印加される電圧は誘導加熱電力によらず一定にできる。 Next, the operation will be described with reference to FIGS. 7 and 8 show the on / off state of each element in this embodiment. In FIG. 7, the switching element 5a of the first upper and lower arm 3 and the switching element 5d of the second upper and lower arm 4 are simultaneously turned on, the switching element 5b of the first upper and lower arm 3 and the second upper and lower arm. By repeating the period in which the four switching elements 5c are simultaneously turned on, an alternating voltage having a switching frequency is applied to the resonant load circuit 60, and a high-frequency current flows through the heating coil 11 to perform induction heating. That is, induction heating is performed by a full bridge operation. Further, since the relay 19 is in the on state and the high frequency voltage is applied to the plasma generation unit 70 by the complementary driving of the switching elements 5a and 5b of the first upper and lower arms 3, plasma is generated. That is, plasma is generated by a half bridge operation. Here, as a method for controlling the induction heating power, the pulse frequency control (PFM) that can easily perform the soft switching operation of the inverter is generally used. However, in this embodiment, since the plasma is generated simultaneously, It is desirable to use phase shift control in which the upper and lower arms 3 and 4 are driven with a phase difference. That is, the switching elements 5a and 5b of the first upper and lower arms 3 are driven with an on-time duty of approximately 50% by providing a dead time, so that the voltage applied to the plasma generator 70 is constant regardless of the induction heating power. Can be.
次に図８について説明する。図８において、第二の上下アーム４のスイッチング素子５ｃ、５ｄはともにオフ状態であり、共振負荷回路６０には交流電圧が印加されない。そのため、加熱コイル１１には高周波電流は流れず誘導加熱は行なわれない。一方、リレー１９がオン状態であれば、第一の上下アーム３のスイッチング素子５ａ、５ｂの相補駆動によって、プラズマ生成部７０に高周波電圧が印加されるためプラズマが発生する。尚、プラズマの発生量は、第一の上下アーム３のパルス周波数制御やパルス幅制御によって、容易に制御することが可能である。 Next, FIG. 8 will be described. In FIG. 8, the switching elements 5 c and 5 d of the second upper and lower arm 4 are both in an off state, and no AC voltage is applied to the resonant load circuit 60. Therefore, high frequency current does not flow through the heating coil 11 and induction heating is not performed. On the other hand, if the relay 19 is in the ON state, plasma is generated because a high frequency voltage is applied to the plasma generating unit 70 by the complementary driving of the switching elements 5a and 5b of the first upper and lower arms 3. Note that the amount of plasma generated can be easily controlled by pulse frequency control and pulse width control of the first upper and lower arms 3.
このように、本実施例は、非磁性体の被加熱物を考慮して加熱コイル１１の巻数を増やした条件においてもインバータをフルブリッジ構成にすることで、磁性体の被加熱物にも所望の電力を供給することが可能である。また、第二の上下アーム４をオフ状態にすれば誘導加熱動作を停止でき、第一の上下アーム３のみを駆動することでプラズマ生成のみを行うことができる。 As described above, in this embodiment, the inverter is made into a full bridge configuration even in a condition where the number of turns of the heating coil 11 is increased in consideration of the non-magnetic material to be heated, so that the magnetic material is also desired. Power can be supplied. Further, the induction heating operation can be stopped if the second upper and lower arms 4 are turned off, and only the plasma generation can be performed by driving only the first upper and lower arms 3.
図９は、実施例３の誘導加熱調理器の回路構成図である。前述の実施例と同一部分については同一符号を付しており説明は省略する。 FIG. 9 is a circuit configuration diagram of the induction heating cooker according to the third embodiment. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.
図９において、直流電源１の正電極と負電極間には、パワー半導体スイッチング素子５ａと５ｂが直列に接続された第一の上下アーム３と、パワー半導体スイッチング素子５ｃと５ｄが直列に接続された第二の上下アーム４が接続されている。スイッチング素子５ａから５ｄにはそれぞれダイオード６ａから６ｄが逆方向に並列接続されている。スイッチング素子５ａから５ｄにはそれぞれスナバコンデンサ７ａから７ｄが並列に接続されている。第一の上下アーム３の出力端子には加熱コイル１１の一端が接続されており、加熱コイル１１の他端と直流電源１の負電極間には第一の共振コンデンサ１２が接続され第一の共振負荷回路５０を構成している。また、加熱コイル１１の他端と第二の上下アームの出力端子間には第二の共振コンデンサ１３とリレー２０の直列回路が接続されている。加熱コイル１１と第一の共振コンデンサ１２及び第二の共振コンデンサ１３により第二の共振負荷回路６０を構成しており、被加熱物の材質や設定火力に応じてリレー２０を切替えることにより、第一の共振負荷回路５０と第二の共振負荷回路６０とを切替えることができる。なお、図９では、加熱コイル１１と第一の共振コンデンサ１２の直列回路を第一の上下アーム３の出力端子と直流電源１の負電極との間に設けたが、第一の上下アーム３の出力端子と直流電源１の正電極との間に設けても良い。第二の上下アーム４の出力端子にはインダクタ２２の一端が接続されており、インダクタ２２の他端と直流電源１の負電極間にはリレー１９を介してプラズマ生成部７０が接続されている。 In FIG. 9, a first upper and lower arm 3 having power semiconductor switching elements 5a and 5b connected in series and power semiconductor switching elements 5c and 5d are connected in series between the positive electrode and the negative electrode of the DC power source 1. A second upper and lower arm 4 is connected. Diodes 6a to 6d are connected in parallel in the reverse direction to the switching elements 5a to 5d, respectively. Snubber capacitors 7a to 7d are connected in parallel to the switching elements 5a to 5d, respectively. One end of the heating coil 11 is connected to the output terminal of the first upper and lower arm 3, and a first resonance capacitor 12 is connected between the other end of the heating coil 11 and the negative electrode of the DC power supply 1. A resonant load circuit 50 is configured. A series circuit of a second resonance capacitor 13 and a relay 20 is connected between the other end of the heating coil 11 and the output terminals of the second upper and lower arms. The heating coil 11, the first resonance capacitor 12, and the second resonance capacitor 13 constitute a second resonance load circuit 60. By switching the relay 20 according to the material of the object to be heated and the set heating power, One resonant load circuit 50 and the second resonant load circuit 60 can be switched. In FIG. 9, the series circuit of the heating coil 11 and the first resonance capacitor 12 is provided between the output terminal of the first upper and lower arm 3 and the negative electrode of the DC power source 1. May be provided between the output terminal and the positive electrode of the DC power source 1. One end of an inductor 22 is connected to the output terminal of the second upper and lower arm 4, and a plasma generator 70 is connected between the other end of the inductor 22 and the negative electrode of the DC power supply 1 via a relay 19. .
次に図１０から図１２を用いて動作を説明する。図１０から図１２は、本実施例における各素子のオンオフ状態を表している。被加熱物が鉄の場合は、図１０に示すように、リレー２０をオンし、第一及び第二の上下アームと加熱コイル１１及び第一、第二の共振コンデンサ１２、１３から構成されるフルブリッジ方式のインバータで加熱を行う。前述のように、磁性体で高抵抗の被加熱物は等価抵抗が大きいため共振負荷回路には電流が流れ難い。従って、フルブリッジ方式に切替えることによりインバータの出力電圧をハーフブリッジ方式より２倍に高め所望の出力を得る。鉄の場合は元々抵抗が大きいため、約２０ｋＨｚの周波数で第一、第二の上下アームを駆動する。リレー１９がオン状態であれば、第二の上下アーム４のスイッチング素子５ｃ、５ｄの相補駆動によって、プラズマ生成部７０に高周波電圧が印加されるためプラズマが発生する。すなわち、第二の上下アーム４のハーフブリッジ動作によってプラズマ生成が行なわれる。尚、誘導加熱電力を制御する方法としては、前述と同様に第一の上下アーム３と第二の上下アーム４に位相差を設けて駆動する位相シフト制御が望ましい。ここでは、第二の上下アーム４のスイッチング素子５ｃと５ｄはデッドタイムを設けてほぼ５０％のオン時間Ｄｕｔｙで駆動することで、プラズマ生成部７０に印加される電圧は誘導加熱電力によらず一定にできる。 Next, the operation will be described with reference to FIGS. 10 to 12 show the on / off state of each element in this embodiment. When the object to be heated is iron, as shown in FIG. 10, the relay 20 is turned on, and the first and second upper and lower arms, the heating coil 11, and the first and second resonant capacitors 12 and 13 are configured. Heating is performed with a full-bridge inverter. As described above, an object to be heated, which is a magnetic substance and has a high resistance, has a large equivalent resistance, so that it is difficult for a current to flow through the resonant load circuit. Therefore, by switching to the full bridge method, the output voltage of the inverter is increased twice as compared with the half bridge method to obtain a desired output. In the case of iron, since the resistance is originally large, the first and second upper and lower arms are driven at a frequency of about 20 kHz. If the relay 19 is on, plasma is generated because a high frequency voltage is applied to the plasma generating unit 70 by the complementary driving of the switching elements 5c and 5d of the second upper and lower arms 4. That is, plasma generation is performed by the half bridge operation of the second upper and lower arms 4. As a method for controlling the induction heating power, phase shift control in which a phase difference is provided between the first upper and lower arms 3 and the second upper and lower arms 4 as described above is desirable. Here, the switching elements 5c and 5d of the second upper and lower arms 4 are provided with a dead time and driven with an on-time duty of approximately 50%, so that the voltage applied to the plasma generator 70 does not depend on the induction heating power. Can be constant.
被加熱物が銅やアルミの場合は、図１１に示すように、リレー２０をオフし、第一の上下アーム３と加熱コイル１１及び第一の共振コンデンサ１２から構成されるハーフブリッジ方式のインバータで加熱を行う。被加熱物の表皮抵抗は周波数の平方根に比例する特徴があり、銅又はアルミなどの低抵抗の被加熱物を加熱する場合には、周波数を高くすることが有効である。従って、第一の上下アーム３を例えば約９０ｋＨｚの周波数で駆動できるように第一の共振コンデンサ１２の容量を設定する。このように第一の共振コンデンサ１２の容量は、約９０ｋＨｚの駆動周波数に合わせて設定するが、第二の共振コンデンサ１３の容量は、約２０ｋＨｚの駆動周波数に合わせて設定する。駆動周波数が大きく異なるため、第二の共振コンデンサ１３の容量は第一の共振コンデンサ１２より十分に大きい値になる。従って、フルブリッジ方式のインバータの共振周波数は、主に第二の共振コンデンサ１３により設定される。 When the object to be heated is copper or aluminum, as shown in FIG. 11, the relay 20 is turned off, and a half-bridge inverter composed of the first upper and lower arms 3, the heating coil 11, and the first resonant capacitor 12. Heat with. The skin resistance of the object to be heated is proportional to the square root of the frequency, and it is effective to increase the frequency when heating an object to be heated such as copper or aluminum having a low resistance. Therefore, the capacity of the first resonant capacitor 12 is set so that the first upper and lower arms 3 can be driven at a frequency of about 90 kHz, for example. As described above, the capacity of the first resonance capacitor 12 is set according to the driving frequency of about 90 kHz, while the capacity of the second resonance capacitor 13 is set according to the driving frequency of about 20 kHz. Since the driving frequency is greatly different, the capacity of the second resonance capacitor 13 is sufficiently larger than that of the first resonance capacitor 12. Accordingly, the resonance frequency of the full-bridge inverter is mainly set by the second resonance capacitor 13.
実施例２では、共振コンデンサは固定されており駆動周波数の設定範囲が限られる課題があったが、本実施例ではリレー２０の切替えにより、共振コンデンサの容量も切替えができる。このように、インバータの駆動周波数の設定範囲を広げることができ被加熱物の材質に合わせて最適な周波数で加熱することができる。リレー１９がオン状態であれば、第二の上下アーム４のスイッチング素子５ｃ、５ｄの相補駆動によって、プラズマ生成部７０に高周波電圧が印加されるためプラズマが発生する。すなわち、被加熱物が銅やアルミの場合には、第二の上下アーム４のハーフブリッジ動作によってプラズマ生成が行なわれる。そのため、誘導加熱動作とは独立した周波数で駆動できるので、プラズマ生成に適した周波数で駆動することが可能となる。本実施例では、誘導加熱時の周波数より高い周波数で第二の上下アーム４を駆動している。尚、プラズマの発生量は、第二の上下アーム４のパルス周波数制御やパルス幅制御によって、容易に制御することが可能である。 In the second embodiment, the resonance capacitor is fixed and there is a problem that the setting range of the drive frequency is limited. However, in this embodiment, the capacitance of the resonance capacitor can be switched by switching the relay 20. Thus, the setting range of the drive frequency of the inverter can be expanded, and heating can be performed at an optimum frequency according to the material of the object to be heated. If the relay 19 is on, plasma is generated because a high frequency voltage is applied to the plasma generating unit 70 by the complementary driving of the switching elements 5c and 5d of the second upper and lower arms 4. That is, when the object to be heated is copper or aluminum, plasma is generated by the half bridge operation of the second upper and lower arms 4. Therefore, since it can be driven at a frequency independent of the induction heating operation, it can be driven at a frequency suitable for plasma generation. In the present embodiment, the second upper and lower arms 4 are driven at a frequency higher than the frequency during induction heating. Note that the amount of plasma generated can be easily controlled by pulse frequency control and pulse width control of the second upper and lower arms 4.
本実施例において、誘導加熱動作を停止し、プラズマ生成のみを行なう場合は、図１２に示すように、上下アーム３をオフ状態とし、リレー１９をオン状態として、第二の上下アーム４のみをハーフブリッジ動作させれば良い。尚、リレー２０はオフ状態にすることが望ましいがオン状態であっても共振コンデンサ１２、１３の直列容量がスナバコンデンサ７ｄに並列に接続されるだけであり、直列容量がスナバコンデンサ７ｄより十分に小さければ問題にはならない。 In this embodiment, when the induction heating operation is stopped and only plasma generation is performed, the upper and lower arms 3 are turned off, the relay 19 is turned on, and only the second upper and lower arms 4 are turned on as shown in FIG. A half-bridge operation may be performed. Although the relay 20 is preferably turned off, the series capacitance of the resonant capacitors 12 and 13 is only connected in parallel to the snubber capacitor 7d even in the on state, and the series capacitance is sufficiently larger than that of the snubber capacitor 7d. It is not a problem if it is small.
図１３は、実施例４の誘導加熱調理器の回路構成図である。実施例１の図１と同一部分については同一符号を付しており説明は省略する。 FIG. 13 is a circuit configuration diagram of the induction heating cooker according to the fourth embodiment. The same portions as those in FIG. 1 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
図１３において、図１と異なる点は、加熱コイル１１と共振コンデンサ１４からなる並列共振負荷回路５１とスイッチング素子５ｂから構成される電圧共振型のインバータを基本構成とし、加熱コイル１１に二次巻線２１を設け、二次巻線２１にリレー１９を介してインダクタ２２とプラズマ生成部７０を接続した点である。本実施例は、インバータ動作によって二次巻線２１に発生した高電圧を有効に利用してプラズマを生成することが可能であるため、追加部品は少なくて済む。 13 is different from FIG. 1 in that a voltage resonance type inverter composed of a parallel resonant load circuit 51 including a heating coil 11 and a resonant capacitor 14 and a switching element 5b is a basic configuration. The wire 21 is provided, and the inductor 22 and the plasma generating unit 70 are connected to the secondary winding 21 via the relay 19. In the present embodiment, it is possible to generate plasma by effectively using the high voltage generated in the secondary winding 21 by the inverter operation, so that the number of additional parts is small.
図１４は、実施例５の誘導加熱調理器の回路構成図である。実施例４の図１３と同一部分については同一符号を付しており説明は省略する。 FIG. 14 is a circuit configuration diagram of the induction heating cooker according to the fifth embodiment. The same parts as those in FIG. 13 of the fourth embodiment are denoted by the same reference numerals, and description thereof is omitted.
図１４において、図１３と異なる点は、共振コンデンサ１４の両端にリレー１９を介してインダクタ２２とプラズマ生成部７０を接続した点である。本実施例は、インバータ動作によって共振コンデンサ１４に発生した高電圧を有効に利用してプラズマを生成することが可能であるため、追加部品は少なくて済む。
14 is different from FIG. 13 in that the inductor 22 and the plasma generation unit 70 are connected to both ends of the resonance capacitor 14 via the relay 19. In the present embodiment, plasma can be generated by effectively using the high voltage generated in the resonant capacitor 14 by the inverter operation, so that the number of additional parts is small.
１…直流電源、３、４…上下アーム、５ａ〜５ｄ…スイッチング素子、６ａ〜６ｄ…ダイオード、７ａ〜７ｄ…コンデンサ、１２〜１４…共振コンデンサ、１１…加熱コイル、２２…インダクタ、５０、５１、６０…共振負荷回路、１８〜２０…リレー、７０…プラズマ生成部、７１、７３…電極、７２…誘電体、８０…トッププレート、８１…左鍋置部、８２…右鍋置部、８３…中央鍋置部、８４…上面表示部、８５…上面操作部、８６…オーブン、８７…オーブン操作部、８８…排気口、８９…ドア、９０…オーブン庫内、９１…上ヒータ、９２…下ヒータ、９３…受皿、９４…焼網、９５…空気浄化用触媒、９６…触媒ヒータ、９７…空気流路、１００〜１０３…吸気口、１５０…モータ、１５１…排気ファン、１５２…自冷ファン、１６０…基板、１６１…半導体部品、１６２…ヒートシンク、１６３…電子部品、１６４…冷却ファン、１７０…筐体内、２００…調理物、３００…システムキッチン DESCRIPTION OF SYMBOLS 1 ... DC power supply 3, 4 ... Upper / lower arm, 5a-5d ... Switching element, 6a-6d ... Diode, 7a-7d ... Capacitor, 12-14 ... Resonance capacitor, 11 ... Heating coil, 22 ... Inductor, 50, 51 , 60 ... Resonant load circuit, 18-20 ... Relay, 70 ... Plasma generator, 71, 73 ... Electrode, 72 ... Dielectric, 80 ... Top plate, 81 ... Left pan holder, 82 ... Right pan holder, 83 ... Central pan placing part, 84 ... Upper surface display part, 85 ... Upper surface operation part, 86 ... Oven, 87 ... Oven operation part, 88 ... Exhaust port, 89 ... Door, 90 ... Inside the oven cabinet, 91 ... Upper heater, 92 ... Lower heater, 93 ... saucer, 94 ... grill, 95 ... catalyst for air purification, 96 ... catalyst heater, 97 ... air flow path, 100-103 ... intake port, 150 ... motor, 151 ... exhaust fan, 152 ... self-cooling fan, 60 ... substrate, 161 ... semiconductor component, 162 ... heat sink 163 ... electronic component, 164 ... cooling fan, 170 ... housing, 200 ... food, 300 ... Kitchen
Claims (7)
該直流電源からの直流電圧を交流電圧に変換するインバータを具備する誘導加熱調理器であって、
前記インバータは、
被加熱物を誘導加熱する加熱コイルと、
プラズマを生成するプラズマ生成部を備えたことを特徴とする誘導加熱調理器。 DC power supply,
An induction heating cooker including an inverter that converts a DC voltage from the DC power source into an AC voltage,
The inverter is
A heating coil for inductively heating an object to be heated;
An induction heating cooker comprising a plasma generation unit for generating plasma.
前記インバータは、
２個のスイッチング素子を直列接続した第一の上下アームと、
該第一の上下アームの出力端子と前記直流電源の電極との間に接続された、前記加熱コイルと第一の共振コンデンサと第一のスイッチ手段の直列回路と、
前記第一の上下アームの出力端子と前記直流電源の電極との間に接続された、前記プラズマ生成部とインダクタと第二のスイッチ手段の直列回路を備えたことを特徴とする誘導加熱調理器。 The induction heating cooker according to claim 1,
The inverter is
A first upper and lower arm in which two switching elements are connected in series;
A series circuit of the heating coil, the first resonant capacitor, and the first switch means connected between the output terminal of the first upper and lower arms and the electrode of the DC power source;
An induction heating cooker comprising a series circuit of the plasma generator, an inductor, and second switch means connected between an output terminal of the first upper and lower arms and an electrode of the DC power supply .
前記インバータは、
２個のスイッチング素子を直列接続した第一の上下アームと、
２個のスイッチング素子を直列接続した第二の上下アームと、
該第一の上下アームと第二の上下アームの出力端子間に接続された、前記加熱コイルと第二の共振コンデンサの直列回路と、
前記第一の上下アームの出力端子と前記直流電源の電極との間に接続された、前記プラズマ生成部とインダクタとスイッチ手段の直列回路を備えたことを特徴とする誘導加熱調理器。 The induction heating cooker according to claim 1,
The inverter is
A first upper and lower arm in which two switching elements are connected in series;
A second upper and lower arm in which two switching elements are connected in series;
A series circuit of the heating coil and a second resonant capacitor connected between the output terminals of the first upper and lower arms and the second upper and lower arms;
An induction heating cooker comprising a series circuit of the plasma generation unit, an inductor, and switch means connected between an output terminal of the first upper and lower arms and an electrode of the DC power source.
前記インバータは、
２個のスイッチング素子を直列接続した第一の上下アームと、
２個のスイッチング素子を直列接続した第二の上下アームと、
該第一の上下アームの出力端子と前記直流電源の電極との間に接続された、被加熱物を誘導加熱する加熱コイルと第一の共振コンデンサの直列回路と、
前記第一の上下アームと第二の上下アームの出力端子間に接続された、前記加熱コイルと第二の共振コンデンサと第一のスイッチ手段の直列回路と、
前記第二の上下アームの出力端子と前記直流電源の電極との間に接続された、前記プラズマ生成部とインダクタと第二のスイッチ手段の直列回路を備えたことを特徴とする誘導加熱調理器。 The induction heating cooker according to claim 1,
The inverter is
A first upper and lower arm in which two switching elements are connected in series;
A second upper and lower arm in which two switching elements are connected in series;
A series circuit of a first coil and a heating coil connected between the output terminal of the first upper and lower arms and the electrode of the DC power source for inductively heating an object to be heated;
A series circuit of the heating coil, the second resonance capacitor and the first switch means connected between the output terminals of the first upper and lower arms and the second upper and lower arms,
An induction heating cooker comprising a series circuit of the plasma generator, an inductor, and second switch means connected between an output terminal of the second upper and lower arms and an electrode of the DC power supply .
前記インバータは、
前記加熱コイルと共振コンデンサの並列回路と、
該並列回路と直列接続したスイッチング素子と、
前記加熱コイルに磁気結合した二次巻線と、
該二次巻線間に接続された、前記プラズマ生成部とインダクタとスイッチ手段の直列回路を備えたことを特徴とする誘導加熱調理器。 The induction heating cooker according to claim 1,
The inverter is
A parallel circuit of the heating coil and a resonant capacitor;
A switching element connected in series with the parallel circuit;
A secondary winding magnetically coupled to the heating coil;
An induction heating cooker comprising a series circuit of the plasma generator, an inductor, and a switch means connected between the secondary windings.
前記インバータは、
前記加熱コイルと共振コンデンサの並列回路と、
該並列回路と直列接続したスイッチング素子と、
前記共振コンデンサ間に接続された、前記プラズマ生成部とインダクタとスイッチ手段の直列回路を備えたことを特徴とする誘導加熱調理器。 The induction heating cooker according to claim 1,
The inverter is
A parallel circuit of the heating coil and a resonant capacitor;
A switching element connected in series with the parallel circuit;
An induction heating cooker comprising a series circuit of the plasma generator, an inductor, and a switch means connected between the resonant capacitors.
前記プラズマ生成部を調理器内の排気口に近い空気流路に配置したことを特徴とする誘導加熱調理器。 In the induction heating cooker according to any one of claims 1 to 6,
An induction heating cooker characterized in that the plasma generator is arranged in an air flow path close to an exhaust port in the cooker.
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| WO2020054539A1 (en) * | 2018-09-12 | 2020-03-19 | Neturen Co., Ltd. | Snubber circuit, power semiconductor module, and induction heating power supply device |
| JP2021019419A (en) * | 2019-07-19 | 2021-02-15 | ローム株式会社 | Gate drive circuit |
| EP3796753A1 (en) * | 2019-09-17 | 2021-03-24 | LG Electronics Inc. | Induction heating device having improved output control function |
| EP3601888B1 (en) * | 2017-03-20 | 2022-06-01 | BSH Hausgeräte GmbH | Induction baking device |
| US12000080B2 (en) | 2017-08-09 | 2024-06-04 | Lg Electronics Inc. | Laundry treatment apparatus and method of controlling the same |
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| KR101985528B1 (en) | 2017-05-25 | 2019-06-03 | 엘지전자 주식회사 | Electromagnetic induction heating cooker |
| KR20230096139A (en) * | 2017-09-06 | 2023-06-29 | 제이티 인터내셔널 소시에떼 아노님 | Induction heating assembly for a vapour generating device |
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