JP7045615B2 - Induction heating cooker - Google Patents

Induction heating cooker Download PDF

Info

Publication number
JP7045615B2
JP7045615B2 JP2018183096A JP2018183096A JP7045615B2 JP 7045615 B2 JP7045615 B2 JP 7045615B2 JP 2018183096 A JP2018183096 A JP 2018183096A JP 2018183096 A JP2018183096 A JP 2018183096A JP 7045615 B2 JP7045615 B2 JP 7045615B2
Authority
JP
Japan
Prior art keywords
induction heating
power supply
inverter
circuit
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2018183096A
Other languages
Japanese (ja)
Other versions
JP2020053323A (en
Inventor
晴俊 中崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2018183096A priority Critical patent/JP7045615B2/en
Publication of JP2020053323A publication Critical patent/JP2020053323A/en
Application granted granted Critical
Publication of JP7045615B2 publication Critical patent/JP7045615B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Description

本発明は、一般家庭用及び業務用として使用される誘導加熱調理器に関するもので、特に複数のインバータを有する多口誘導加熱調理器に関するものある。 The present invention relates to an induction heating cooker used for general household use and commercial use, and more particularly to a multi-mouth induction heating cooker having a plurality of inverters.

従来、この種の誘導加熱調理器において、複数のインバータを備え多口加熱できる誘導加熱調理器や（例えば、特許文献１参照）、誘導加熱調理器の制御手段に電力を供給する直流電源の構成を開示したものがある（例えば、特許文献２）。 Conventionally, in this type of induction heating cooker, a configuration of an induction heating cooker equipped with a plurality of inverters capable of multi-mouth heating (see, for example, Patent Document 1) and a DC power supply for supplying electric power to a control means of the induction heating cooker. (For example, Patent Document 2).

図４は、前記特許文献１に記載された従来の誘導加熱調理器の回路ブロック図を示すものである。図４に示すように交流電源４１と、交流電源４１を整流する整流回路４２と、整流回路４２の出力を平滑する平滑コンデンサ４９と、平滑コンデンサ４９の出力を高周波電力に変換する第１および第２のインバータ４４、４５と、それぞれのインバータに接続されインバータから高周波電流が供給される第１および第２の加熱コイル４６、４７と、交流電源４１から整流回路４２に流れる電流をカレントトランスなどで検出する入力電流検出手段４３と、入力電流検出手段４３の検出値が設定値になるように第１及び第２のインバータ内の半導体スイッチを制御する制御手段４８から構成されている。 FIG. 4 shows a circuit block diagram of the conventional induction heating cooker described in Patent Document 1. As shown in FIG. 4, the AC power supply 41, the rectifier circuit 42 that rectifies the AC power supply 41, the smoothing capacitor 49 that smoothes the output of the rectifier circuit 42, and the first and first lines that convert the output of the smoothing capacitor 49 into high-frequency power. 2 inverters 44 and 45, first and second heating coils 46 and 47 connected to the respective inverters and supplied with high-frequency current from the inverters, and the current flowing from the AC power supply 41 to the rectifier circuit 42 by a current transformer or the like. It is composed of an input current detecting means 43 for detection and a control means 48 for controlling semiconductor switches in the first and second inverters so that the detected value of the input current detecting means 43 becomes a set value.

図５は、前記特許文献２に記載された従来の誘導加熱調理器の回路ブロック図を示すものである。図５において、５１は交流電源、５２は交流電源５１を整流するブリッジ接続されたダイオードから成る整流回路、５３はチョークコイル５３ａ及びコンデンサ５３ｂから成る平滑回路、５４はスイッチング手段５４ａを含むインバータ回路、５５はインバータ回路５４から高周波電流を供給されることにより鍋等の被加熱体５６に高周波交番磁界を印加して誘導加熱を行う加熱コイル、５７はインバータ回路５４の動作を制御する制御回路、５９は制御回路５７の動作電源を生成する直流電源である。 FIG. 5 shows a circuit block diagram of a conventional induction heating cooker described in Patent Document 2. In FIG. 5, 51 is an AC power supply, 52 is a rectifying circuit including a bridge-connected diode that rectifies the AC power supply 51, 53 is a smoothing circuit including a choke coil 53a and a capacitor 53b, and 54 is an inverter circuit including a switching means 54a. 55 is a heating coil that applies a high-frequency alternating magnetic field to a heated body 56 such as a pot by supplying a high-frequency current from the inverter circuit 54 to perform induced heating, 57 is a control circuit that controls the operation of the inverter circuit 54, 59. Is a DC power source that generates an operating power source for the control circuit 57.

図６は、特許文献１に記載された誘導加熱調理器と特許文献２に記載された誘導加熱調理器とを組み合わせえることで得られる誘導加熱調理器の回路ブロック図である。ａは整流回路４２の不出力側で回路全体の基準電位となる回路ポイント、ｂはａに接続された直流電源５９の基準電位となる回路ポイント、ｃはａに接続されたインバータ４４の基準電位となる回路ポイント、ｄはａに接続されたインバータ４５の基準電位となる回路ポイントである。ａ－ｃ間、ａ－ｄ間は通常プリント配線板上に形成された銅箔パターンやリード線で接続されており、この銅箔パターンやリード線にはインピーダンスが少なからずあるため、ここに大電流が流れると電位差Ｖａｃ、Ｖａｄを生じる。このためインバータ４４、４５に供給される直流電圧は、直流電源５９の出力ＶｏよりもそれぞれＶａｃ、Ｖａｄ低い電圧が供給される。 FIG. 6 is a circuit block diagram of an induction heating cooker obtained by combining the induction heating cooker described in Patent Document 1 and the induction heating cooker described in Patent Document 2. a is a circuit point that is the reference potential of the entire circuit on the non-output side of the rectifying circuit 42, b is a circuit point that is the reference potential of the DC power supply 59 connected to a, and c is the reference potential of the inverter 44 connected to a. The circuit point d is a circuit point that serves as a reference potential for the inverter 45 connected to a. A-c and ad are usually connected by a copper foil pattern or lead wire formed on a printed wiring board, and this copper foil pattern or lead wire has considerable impedance, so it is large here. When a current flows, potential differences Vac and Vad are generated. Therefore, the DC voltage supplied to the inverters 44 and 45 is Vac and Vad lower than the output Vo of the DC power supply 59, respectively.

特開２０１２－０４３６３４号公報Japanese Unexamined Patent Publication No. 2012-043634 特開２００４－１９２８８０号公報Japanese Unexamined Patent Publication No. 2004-192880

しかしながら、図６に示す誘導加熱調理器の回路では、電位差Ｖａｃ、Ｖａｄは個々のインバータの運転状況に左右されため、個々のインバータに供給される電圧が異なることとなる。さらに、ａ－ｃ間、ａ－ｄ間に共通部分があると個々のインバータに供給される
電圧は他のインバータの運転状況に因り供給される電圧が異なることとなる。このことにより、例えばインバータのスイッチング素子は駆動電圧によりその損失が異なるため、運転状況により駆動電圧が左右されることになり、インバータを安定的に動作させることができなくなる。 However, in the circuit of the induction heating cooker shown in FIG. 6, since the potential differences Vac and Vad depend on the operating conditions of the individual inverters, the voltages supplied to the individual inverters are different. Further, if there is an intersection between a and a, the voltage supplied to each inverter will be different depending on the operating conditions of other inverters. As a result, for example, the loss of the switching element of the inverter differs depending on the drive voltage, so that the drive voltage is affected by the operating conditions, and the inverter cannot be operated stably.

本発明は、前記従来の課題を解決するもので、多口誘導加熱調理器において、各インバータの運転状況に因らず、インバータ駆動に必要な所定の電圧を個々のインバータに安定して供給できる回路構成を提供することを目的とする。 The present invention solves the above-mentioned conventional problems, and can stably supply a predetermined voltage required for driving an inverter to each inverter in a multi-port induction heating cooker regardless of the operating condition of each inverter. It is intended to provide a circuit configuration.

前記従来の課題を解決するために、本発明の誘導加熱調理器は、商用電源を整流する整流回路と、前記整流回路の負出力を基準電位とする直流電源と、複数組のインバータと、を備え、前記複数組のインバータのそれぞれは、被加熱物を誘導加熱する誘導加熱手段と、前記誘導加熱手段の負出力を基準として前記直流電源の出力を前記誘導加熱手段のスイッチング素子へ所定の直流電圧に変換出力する駆動電源と、を組として有するものである。 In order to solve the above-mentioned conventional problems, the induction heating cooker of the present invention includes a rectifier circuit for rectifying a commercial power supply, a DC power supply having a negative output of the rectifier circuit as a reference potential, and a plurality of sets of inverters. Each of the plurality of sets of inverters comprises an inductive heating means for inductively heating the object to be heated, and a predetermined direct current of the output of the DC power supply to the switching element of the inductive heating means with reference to the negative output of the inductive heating means. It has a drive power supply that converts and outputs a voltage as a set .

これによって、個々のインバータの運転状況に因らず各インバータへ駆動に必要な所定の電圧を安定供給することができる。 As a result, a predetermined voltage required for driving can be stably supplied to each inverter regardless of the operating conditions of the individual inverters.

また、本発明の誘導加熱調理器は、直流電源は、各駆動電源の出力電圧よりも高い電圧を出力するとしたものである。 Further, in the induction heating cooker of the present invention, the DC power source outputs a voltage higher than the output voltage of each drive power source.

これによって、前記駆動電源は安価な降圧レギュレータ回路で構成することが可能となる。 This makes it possible to configure the drive power supply with an inexpensive step-down regulator circuit.

また、本発明の誘導加熱調理器は、駆動電源の入力部に短絡保護手段を備えたものである。 Further, the induction heating cooker of the present invention is provided with a short-circuit protection means at the input portion of the drive power supply.

これによって、駆動電源が短絡故障した場合に直流電源へ及ぼす影響を最小限に抑えることができる。 As a result, it is possible to minimize the influence on the DC power supply when the drive power supply fails due to a short circuit.

また、本発明の誘導加熱調理器は、整流回路の負出力と各誘導加熱手段との間に各誘導加熱手段に流れる電流を検知する電流検知手段を設けたものである。 Further, the induction heating cooker of the present invention is provided with a current detecting means for detecting a current flowing through each induction heating means between the negative output of the rectifying circuit and each induction heating means.

これによって、電流検知手段による電圧降下による影響をインバータに与えることなく制御手段は各インバータへの入力電流を検知することができる。 As a result, the control means can detect the input current to each inverter without affecting the inverter due to the influence of the voltage drop caused by the current detecting means.

本発明の誘導加熱調理器は、個々の誘導加熱手段に各誘導加熱手段を基準電位とする駆動電源を構成することで、誘導加熱手段の安定性と信頼性を向上させることができる。 In the induction heating cooker of the present invention, the stability and reliability of the induction heating means can be improved by configuring each induction heating means with a drive power source having each induction heating means as a reference potential.

本発明の実施の形態１における誘導加熱調理器の回路ブロック図Circuit block diagram of the induction heating cooker according to the first embodiment of the present invention. 本発明の実施の形態２における誘導加熱調理器の回路ブロック図Circuit block diagram of the induction heating cooker according to the second embodiment of the present invention 本発明の実施の形態３における誘導加熱調理器の回路ブロック図Circuit block diagram of the induction heating cooker according to the third embodiment of the present invention. 従来の誘導加熱調理器の回路ブロック図Circuit block diagram of a conventional induction heating cooker 従来の誘導加熱調理器の回路ブロック図Circuit block diagram of a conventional induction heating cooker 図４と図５とに示す従来の誘導加熱調理器の回路ブロック図を組み合わせた誘導加熱調理器の回路ブロック図Circuit block diagram of an induction heating cooker that combines the circuit block diagrams of the conventional induction heating cooker shown in FIGS. 4 and 5.

第１の発明は、商用電源を整流する整流回路と、前記整流回路の負出力を基準電位とする直流電源と、被加熱物を誘導加熱する誘導加熱手段と、前記誘導加熱手段の負出力を基準として前記直流電源の出力を前記誘導加熱手段へ所定の直流電圧に変換出力する駆動電源とを組とするインバータを複数組備えた誘導加熱調理器とすることにより、個々のインバータの運転状況に因らず各インバータへ駆動に必要な所定の電圧が安定供給されることとなり、誘導加熱調理器の安定性と信頼性を高めることができる。 The first invention comprises a rectifying circuit for rectifying a commercial power source, a DC power source using the negative output of the rectifying circuit as a reference potential, an induced heating means for inductively heating an object to be heated, and a negative output of the inductive heating means. As a reference, the operation status of each inverter can be adjusted by using an induction heating cooker equipped with a plurality of sets of inverters including a drive power source that converts and outputs the output of the DC power supply to the induction heating means to a predetermined DC voltage. Regardless of this, a predetermined voltage required for driving is stably supplied to each inverter, and the stability and reliability of the induction heating cooker can be improved.

第２の発明は、特に、第１の発明の直流電源出力を各駆動電源の出力電圧よりも高い電圧を出力するとしたことにより、前記駆動電源に安価な降圧レギュレータ回路（例えば、ＮＰＮトランジスタと、抵抗器と、ツェナーダイオードで構成する降圧レギュレータ）で構成することが可能となり、駆動電源をあらたに追加したことによるコストアップを抑制することができる。 The second invention particularly relates to an inexpensive step-down regulator circuit (for example, an NPN transistor and an NPN transistor) for the drive power supply because the DC power supply output of the first invention outputs a voltage higher than the output voltage of each drive power supply. It is possible to configure it with a resistor and a step-down regulator composed of a Zener diode), and it is possible to suppress the cost increase due to the addition of a new drive power supply.

第３の発明は、特に、第１または第２の発明の駆動電源入力部に短絡保護手段を備えたことにより、いずれの駆動電源が短絡故障した場合においても直流電源へ及ぼす影響を最小限に抑えることができ、誘導加熱調理器の信頼性を向上させることができる。 The third invention minimizes the influence on the DC power supply even if any of the drive power supplies is short-circuited, in particular, by providing the drive power supply input unit of the first or second invention with a short-circuit protection means. It can be suppressed and the reliability of the induction heating cooker can be improved.

第４の発明は、特に、第１～３のいずれか１つの発明の誘導加熱調理器において、整流回路の負出力と各誘導加熱手段との間に各誘導加熱手段に流れる電流を検知する電流検知手段を設けたことにより、前記制御手段は個々のインバータの入力電流を検知することができるので、１つの制御手段で複数のインバータを高精度に電力制御することが可能となる。 The fourth invention is, in particular, in the induction heating cooker of any one of the first to third inventions, a current for detecting a current flowing through each induction heating means between the negative output of the rectifying circuit and each induction heating means. By providing the detecting means, the control means can detect the input current of each inverter, so that one control means can control the power of a plurality of inverters with high accuracy.

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、本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. The present invention is not limited to the present embodiment.

（実施の形態１）
図１は、本発明の第１の実施の形態における誘導加熱調理器の回路ブロック図を示すものである。 (Embodiment 1)
FIG. 1 shows a circuit block diagram of an induction heating cooker according to the first embodiment of the present invention.

図１において、商用電源１と、ダイオードブリッジ（図示せず）とチョークコイル（図示せず）と平滑コンデンサ（図示せず）で構成され、商用電源１を整流する整流回路２と、前記整流回路２の負出力を基準電位とし所定の電圧Ｖｏを出力するする直流電源３である。 In FIG. 1, a rectifier circuit 2 composed of a commercial power supply 1, a diode bridge (not shown), a choke coil (not shown), and a smoothing capacitor (not shown) to rectify the commercial power supply 1, and the rectifier circuit. The DC power supply 3 outputs a predetermined voltage Vo with the negative output of 2 as a reference potential.

第１のインバータ４は、被加熱物（図示せず）を誘導加熱する第１の誘導加熱手段４ａと、前記第１の誘導加熱手段４ａの負出力を基準電位として前記直流電源３の出力を前記第１の誘導加熱手段４ａへ所定の電圧Ｖｏ１に変換出力する第１の駆動電源４ｂとで構成され、
第２のインバータ５は、被加熱物（図示せず）を誘導加熱する第２の誘導加熱手段５ａと、前記第２の誘導加熱手段５ａの負出力を基準電位として前記直流電源３の出力を前記第２の誘導加熱手段５ａへ所定の電圧Ｖｏ２に変換出力する第２の駆動電源５ｂとで構成され、
前記第１のインバータ４と前記第２のインバータ５は制御手段６で制御されるよう構成されている。第１の誘導加熱手段４ａと第２の誘導加熱手段５ａは、被加熱物（図示せず）を加熱する加熱コイル（図示せず）と前記加熱コイルと共振回路を為す共振コンデンサ（図示せず）と、前記共振回路に共振電流を生成する為に排他的に動作するスイッチング素子（図示せず）（例えばＩＢＧＴ）と、前記スイッチング素子を駆動する駆動手段（図示せず）で構成される。整流回路２の負出力における整流回路２近傍の回路ポイントをａ
、ａに接続されている第１の誘導加熱手段４ａ近傍の回路ポイントをｂ、前記ｂに接続された前記第１の駆動手段４ｂ近傍の回路ポイントをｃ、ａに接続されている第２の誘導加熱手段５ａ近傍の回路ポイントをｄ、前記ｄに接続され前記第２の駆動手段５ｂ近傍の回路ポイントをｅとする。 The first inverter 4 outputs the output of the DC power supply 3 with the negative output of the first induction heating means 4a for inductively heating the object to be heated (not shown) and the first inductive heating means 4a as a reference potential. It is composed of a first drive power source 4b that converts and outputs a predetermined voltage Vo1 to the first induction heating means 4a.
The second inverter 5 outputs the output of the DC power supply 3 with the negative output of the second induction heating means 5a for inductively heating the object to be heated (not shown) and the second induction heating means 5a as a reference potential. It is composed of a second drive power source 5b that converts and outputs a predetermined voltage Vo2 to the second induction heating means 5a.
The first inverter 4 and the second inverter 5 are configured to be controlled by the control means 6. The first induction heating means 4a and the second induction heating means 5a are a heating coil (not shown) for heating an object to be heated (not shown) and a resonance capacitor (not shown) forming a resonance circuit with the heating coil. ), A switching element (not shown) that operates exclusively to generate a resonant current in the resonant circuit (for example, IBGT), and a driving means (not shown) that drives the switching element. The circuit point near the rectifier circuit 2 in the negative output of the rectifier circuit 2 is a.
, The circuit point near the first induction heating means 4a connected to a is connected to b, and the circuit point near the first driving means 4b connected to b is connected to c, a. Let d be a circuit point in the vicinity of the induction heating means 5a, and let e be a circuit point in the vicinity of the second driving means 5b connected to the d.

以上のように構成された誘導加熱調理器について、以下その動作、作用を説明する。 The operation and operation of the induction heating cooker configured as described above will be described below.

第１のインバータ４で消費される電流は、第１の誘導加熱手段の負出力から整流回路２に戻る。すなわち点ｂから点ａに向けて大きな電流（例えば数アンペアから十数アンペア）が流れる。回路図上では点ｂと点ａとの間は同電位と表現されるが、現実の誘導加熱調理器において、点ｂと点ａとの間は銅箔パターンやリード線などを介して接続されており、ここには少なからずインピーダンスがあるため点ｂと点ａの間に大きな電流が流れると点ｂと点ａとの間には電位差が発生する。このため、点ａを基準として第１の誘導加熱手段４ａへ電源供給すると、自身の運転状況により供給される電源電圧が左右されることとなる。また、第２の誘導加熱手段５ａにも第１の誘導加熱手段４ａと同様に大きな電流が流れる。第２の誘導加熱手段５ａで消費される電流は点ｄから点ａに向けて流れており、点ｂ点ａ間と点ｄ点ａ間に共通部分がある場合には、点ａを基準として第１の誘導加熱手段４ａへ電源供給すると、自身の運転状況のみならず第２のインバータ５の運転状況に応じて供給される電源電圧が左右されることとなる。しかしながら、第１のインバータ４には第１の駆動電源４ｂを備えているため、自身や他のインバータの運転状況に左右されることなく、駆動に必要な電源電圧を安定して供給される。これは、第１の駆動電源４ｂが、前記ｂに接続された前記第１の駆動手段４ｂの負出力上の回路ポイントｃを基準電位として第１の誘導加熱手段４ａへ電源供給しているためで、点ｂと点ｃとの間に流れる電流は点ｂと点ａ間に流れる電流よりも十分に少なく（例えば１００ｍＡ前後）、点ｂと点ａ間での電圧降下を無視できる程度の電位差しか生じないためである。第１のインバータ４と第２のインバータ５とは基本構成は同様であるため、第２のインバータ５においても第１のインバータ４と同様の動作となることから、詳細の説明は省略する。 The current consumed by the first inverter 4 returns from the negative output of the first induction heating means to the rectifier circuit 2. That is, a large current (for example, from a few amperes to a dozen amperes) flows from the point b to the point a. In the circuit diagram, the points b and a are expressed as the same potential, but in an actual induction heating cooker, the points b and a are connected via a copper foil pattern, a lead wire, or the like. Since there is not a little impedance here, when a large current flows between the points b and a, a potential difference is generated between the points b and a. Therefore, when power is supplied to the first induction heating means 4a with reference to the point a, the power supply voltage supplied is affected by its own operating condition. Further, a large current flows through the second induction heating means 5a as well as the first induction heating means 4a. The current consumed by the second induction heating means 5a flows from the point d toward the point a, and when there is an intersection between the points b and the point d, the point a is used as a reference. When power is supplied to the first induction heating means 4a, the power supply voltage supplied is affected not only by the operating condition of itself but also by the operating condition of the second inverter 5. However, since the first inverter 4 is provided with the first drive power supply 4b, the power supply voltage required for driving can be stably supplied without being influenced by the operating conditions of itself or other inverters. This is because the first drive power source 4b supplies power to the first inductive heating means 4a with the circuit point c on the negative output of the first drive means 4b connected to the b as a reference potential. The current flowing between the points b and c is sufficiently smaller than the current flowing between the points b and a (for example, around 100 mA), and the potential difference between the points b and a is negligible. This is because it only occurs. Since the basic configuration of the first inverter 4 and the second inverter 5 is the same, the operation of the second inverter 5 is the same as that of the first inverter 4, and detailed description thereof will be omitted.

以上のように、本実施の形態の誘導加熱調理器において、各インバータ（例えばインバータ４）の各誘導加熱手段（例えば第１の誘導加熱手段４ａ）の負出力を基準とする駆動電源（例えば第１の駆動電源４ｂ）を備えることにより、自身や他のインバータの運転状況に因らず必要な電源電圧の供給を安定して受けることができるため、信頼性の高い多口誘導加熱調理器を提供することが可能となる。 As described above, in the induction heating cooker of the present embodiment, the drive power source (for example, the first) based on the negative output of each induction heating means (for example, the first induction heating means 4a) of each inverter (for example, the inverter 4). By providing the drive power supply 4b) of 1, it is possible to stably receive the required power supply voltage regardless of the operating conditions of itself and other inverters, so a highly reliable multi-port induction heating cooker can be used. It will be possible to provide.

なお、直流電源３の出力電圧Ｖｏを、各インバータ駆動に必要な電圧に各誘導加熱手段の負出力と整流回路２の負出力間で生じる電位差の最大値以上の電圧を加えた値を上回る値とすれば、各駆動電源は安価な降圧レギュレータ（例えば、ＮＰＮトランジスタと、抵抗器と、ツェナーダイオードで構成する降圧レギュレータ）で構成することができ、各インバータへ駆動電源を追加することでのコストアップを抑制することができる。 The output voltage Vo of the DC power supply 3 exceeds the value obtained by adding the voltage required for driving each inverter to the voltage equal to or greater than the maximum value of the potential difference generated between the negative output of each induction heating means and the negative output of the rectifier circuit 2. If so, each drive power supply can be configured with an inexpensive step-down regulator (for example, a step-down regulator composed of an NPN transistor, a resistor, and a Zener diode), and the cost of adding a drive power supply to each inverter. Up can be suppressed.

また、本実施の形態では、誘導加熱調理器のインバータを２つとしたが、特に２つに限定せずともよく、３つ以上のインバータを備える多口誘導加熱調理器においても、各インバータ毎に個々に駆動電源を備えるように構成してもよい。 Further, in the present embodiment, the number of inverters of the induction heating cooker is two, but the number of inverters is not particularly limited to two, and even in a multi-port induction heating cooker provided with three or more inverters, each inverter is used. It may be configured to individually include a drive power supply.

（実施の形態２）
図２は、本発明の第２の実施の形態における誘導加熱調理器の回路ブロック図を示すものである。 (Embodiment 2)
FIG. 2 shows a circuit block diagram of an induction cooker according to a second embodiment of the present invention.

図２において、図１と同じ番号を付した箇所は図１と同じものであり、詳細の説明は省略する。 In FIG. 2, the parts having the same numbers as those in FIG. 1 are the same as those in FIG. 1, and detailed description thereof will be omitted.

第１のインバータ７は、第１の誘導加熱手段４ａと、第１の駆動電源４ｂと、直流電源３と第１の駆動電源４ｂとの間に接続された第１の短絡保護手段７ａとで構成され、第２のインバータ８は、第２の誘導加熱手段５ａと、第２の駆動電源５ｂと、直流電源３と第２の駆動電源５ｂとの間に接続された第２の短絡保護手段８ａとで構成され、第１の短絡保護手段７ａは第１の駆動電源４および直流電源３のいずれの定格電流より低い第１の所定電流Ｉ１以上が流れると断線し、第２の短絡保護手段８ａは第２の駆動電源５ｂおよび直流電源３のいずれの定格電流より低い第２の所定電流Ｉ２以上流れると断線するものである。 The first inverter 7 is composed of a first inductive heating means 4a, a first drive power source 4b, and a first short-circuit protection means 7a connected between the DC power source 3 and the first drive power source 4b. The second inverter 8 is configured as a second short-circuit protection means connected between the second inductive heating means 5a, the second drive power source 5b, the DC power source 3 and the second drive power source 5b. The first short-circuit protection means 7a is composed of 8a, and the first short-circuit protection means 7a is disconnected when a first predetermined current I1 or more, which is lower than the rated current of either the first drive power supply 4 or the DC power supply 3, flows, and the second short-circuit protection means. Reference numeral 8a is such that when a second predetermined current I2 or more, which is lower than the rated current of either the second drive power supply 5b or the DC power supply 3, flows, the wire is disconnected.

以上のように構成された誘導加熱調理器について、以下その動作、作用を説明する。 The operation and operation of the induction heating cooker configured as described above will be described below.

第１の短絡保護手段７ａと直流電源３と間に短絡保護手段４ｃを備えたことで、第１の駆動電源４ｂの出力電流が何らかの原因で過大となり、第１の所定電流以上となると第１の短絡保護手段７ａが断線となる。このため第１の駆動電源４ｂの出力電流が第１の所定電流以上となることはない。第２の駆動電源８ａも同様に、その出力電流が第２の所定電流Ｉ２以上となることはない。 By providing the short-circuit protection means 4c between the first short-circuit protection means 7a and the DC power supply 3, the output current of the first drive power supply 4b becomes excessive for some reason, and when the current exceeds the first predetermined current, the first The short-circuit protection means 7a of the above is broken. Therefore, the output current of the first drive power supply 4b does not exceed the first predetermined current. Similarly, the output current of the second drive power supply 8a does not exceed the second predetermined current I2.

以上のように、第１の駆動電源４ｂと直流電源３との間に第１の短絡保護手段７ａを備え、第２の駆動電源５ｂと直流電源３との間に第２の短絡保護手段８ａを備えることにより、いずれかの駆動電源に電流が流れる異常時にも直流電源３に過大な電流が流れることを抑制でき、第１の駆動手段４ｂや第２の駆動手段５ｂの異常時における直流電源３への影響を最小限に抑えることができるため、直流電源３から異常発生していないインバータへ電力の安定供給が可能となり、信頼性の高い多口誘導加熱調理器を提供することができる。 As described above, the first short-circuit protection means 7a is provided between the first drive power supply 4b and the DC power supply 3, and the second short-circuit protection means 8a is provided between the second drive power supply 5b and the DC power supply 3. By providing the above, it is possible to suppress an excessive current from flowing to the DC power supply 3 even when a current flows through any of the drive power supplies, and the DC power supply when the first drive means 4b or the second drive means 5b is abnormal. Since the influence on 3 can be minimized, it is possible to stably supply power from the DC power supply 3 to the inverter in which no abnormality has occurred, and it is possible to provide a highly reliable multi-mouth induction heating cooker.

なお、本実施の形態では、第１の短絡保護手段４ｃを第１の所定電流Ｉ１以上の電流が流れると断線するとしたが、第１の短絡保護手段４ｃを第１の所定電流Ｉ１以上の電流が流れないように流れる電流を制限するものとしてもよい。同様に、第２の短絡保護手段５ｃを第２の所定電流Ｉ２以上の電流が流れると断線するとしたが、第２の短絡保護手段５ｃを第２の所定電流Ｉ２以上の電流が流れないように流れる電流を制限するものとしていもよい。 In the present embodiment, it is assumed that the first short-circuit protection means 4c is disconnected when a current of the first predetermined current I1 or more flows, but the first short-circuit protection means 4c is connected to the current of the first predetermined current I1 or more. The current may be limited so that the current does not flow. Similarly, it is assumed that the second short-circuit protection means 5c is disconnected when a current of the second predetermined current I2 or more flows, but the second short-circuit protection means 5c is prevented from flowing a current of the second predetermined current I2 or more. It may be used to limit the flowing current.

また、本実施の形態では、誘導加熱調理器のインバータを２つとしたが、特に２つに限定せずともよく、３つ以上のインバータを備える多口誘導加熱調理器においても適用してよい。 Further, in the present embodiment, the number of inverters of the induction heating cooker is two, but the number of inverters is not particularly limited to two, and the present invention may be applied to a multi-mouth induction heating cooker provided with three or more inverters.

（実施の形態３）
図３は、本発明の第３の実施の形態における誘導加熱調理器の回路ブロック図を示すものである。 (Embodiment 3)
FIG. 3 shows a circuit block diagram of an induction cooker according to a third embodiment of the present invention.

図３において、図１および図２と同じ番号を付した箇所は図１、図２と同じものであり、詳細の説明は省略する。 In FIG. 3, the parts having the same numbers as those in FIGS. 1 and 2 are the same as those in FIGS. 1 and 2, and detailed description thereof will be omitted.

図３において、第１のインバータ９は、図１における第１のインバータ４あるいは図２における第１のインバータ７に第１の電流検知手段９ａを追加したものであり、第１の電流検知手段９ａは整流回路２の負出力と第１の誘導加熱手段４ａの負出力間にあって、第１の電流検知手段９ａに流れる電流に応じた電圧を制御手段１１に入力するものである。第２のインバータ１０は、図１における第２のインバータ５あるいは図２における第２のインバータ８に、第２の電流検知手段１０ａを追加したものであり、第２の電流検知手段
１０ａは整流回路２の負出力と第２の誘導加熱手段５ａの負出力間にあって、第２の電流検知手段１０ａに流れる電流に応じた電圧を制御手段１１に入力するものである。制御手段１１は、第１の電流検知手段９ａからの入力に応じて第１のインバータの電力制御を行い、第２の電流検知手段１０ａからの入力に応じて第２のインバータの電力制御を行うものである。 In FIG. 3, the first inverter 9 is obtained by adding the first current detecting means 9a to the first inverter 4 in FIG. 1 or the first inverter 7 in FIG. 2, and the first current detecting means 9a. Is between the negative output of the rectifying circuit 2 and the negative output of the first induction heating means 4a, and inputs a voltage corresponding to the current flowing through the first current detecting means 9a to the control means 11. The second inverter 10 is obtained by adding a second current detecting means 10a to the second inverter 5 in FIG. 1 or the second inverter 8 in FIG. 2, and the second current detecting means 10a is a rectifier circuit. A voltage corresponding to the current flowing through the second current detecting means 10a, which is between the negative output of 2 and the negative output of the second induction heating means 5a, is input to the control means 11. The control means 11 controls the power of the first inverter according to the input from the first current detecting means 9a, and controls the power of the second inverter according to the input from the second current detecting means 10a. It is a thing.

以上のように構成された誘導加熱調理器について、以下その動作、作用を説明する。 The operation and operation of the induction heating cooker configured as described above will be described below.

第１のインバータ４で消費される電流は、第１の誘導加熱手段の負出力から整流回路２に戻る。すなわち点ｂから点ａに向けて大きな電流（例えば数アンペアから十数アンペア）が流れる。点ｂと点ａとの間には第１の電流検知手段９ａがあり、この第１の電流検知手段で少なからず電圧降下が生じる。また、第１の電流検知手段９ａと点ｂや点ａとの間は銅箔パターンやリード線などで接続されており、この間にもインピーダンスがあるため点ｂと点ａの間に大きな電流が流れると、点ｂと点ａとの間に第１の電流検知手段９ａのみで生じる電位差以上の電位差が発生する。このため、点ａを基準として第１の誘導加熱手段４ａへ電源供給すると、自身の運転状況により供給される電源電圧が左右されることとなる。また、第２の誘導加熱手段５ａにも第１の誘導加熱手段ａと同様に大きな電流が流れる。第２の誘導加熱手段５ａで消費される電流は点ｄから点ａに向けて流れており、点ｂ点ａ間と点ｄ点ａ間に共通部分がある場合には、点ａを基準として第１の誘導加熱手段４ａへ電源供給すると、自身の運転状況のみならず他のインバータの運転状況に応じて供給される電源電圧が左右されることとなる。しかしながら、第１のインバータ４には第１の駆動電源４ｂを備えているため、自身や他のインバータの運転状況に左右されることなく、駆動に必要な電源電圧を安定して供給される。これは、第１の駆動電源４ｂが、前記ｂに接続された前記第１の駆動手段４ｂの負出力上の回路ポイントｃを基準電位として第１の誘導加熱手段４ａへ電源供給しているためで、点ｂと点ｃとの間に流れる電流は点ｂと点ａ間に流れる電流よりも十分に少なく（例えば１００ｍＡ前後）、点ｂと点ａ間での電圧降下を無視できる程度の電位差しか生じないためである。第１のインバータ４と第２のインバータ５とは基本構成は同様であるため、第２のインバータ５においても第１のインバータ４と同様の動作となることから、詳細の説明は省略する。 The current consumed by the first inverter 4 returns from the negative output of the first induction heating means to the rectifier circuit 2. That is, a large current (for example, from a few amperes to a dozen amperes) flows from the point b to the point a. There is a first current detecting means 9a between the point b and the point a, and the first current detecting means causes a voltage drop to some extent. Further, the first current detecting means 9a and the point b or the point a are connected by a copper foil pattern, a lead wire, or the like, and since there is impedance between them, a large current flows between the point b and the point a. When the current flows, a potential difference equal to or greater than the potential difference generated only by the first current detecting means 9a is generated between the point b and the point a. Therefore, when power is supplied to the first induction heating means 4a with reference to the point a, the power supply voltage supplied is affected by its own operating condition. Further, a large current flows through the second induction heating means 5a as well as the first induction heating means a. The current consumed by the second induction heating means 5a flows from the point d toward the point a, and when there is an intersection between the points b and the point d, the point a is used as a reference. When power is supplied to the first induction heating means 4a, the power supply voltage supplied is affected not only by the operating condition of itself but also by the operating condition of other inverters. However, since the first inverter 4 is provided with the first drive power supply 4b, the power supply voltage required for driving can be stably supplied without being influenced by the operating conditions of itself or other inverters. This is because the first drive power source 4b supplies power to the first induction heating means 4a with the circuit point c on the negative output of the first drive means 4b connected to the b as a reference potential. The current flowing between the points b and c is sufficiently smaller than the current flowing between the points b and a (for example, around 100 mA), and the potential difference between the points b and a is negligible. This is because it only occurs. Since the basic configuration of the first inverter 4 and the second inverter 5 is the same, the operation of the second inverter 5 is the same as that of the first inverter 4, and detailed description thereof will be omitted.

以上のように、本実施の形態の誘導加熱調理器において、各インバータ（例えばインバータ４）の各誘導加熱手段（例えば第１の誘導加熱手段４ａ）の負出力を基準とする駆動電源（例えば第１の駆動電源４ｂ）を備えることにより、自身や他のインバータの運転状況に因らず必要な電源電圧の供給を安定して受けることができるため、信頼性の高い多口誘導加熱調理器を提供することが可能となる。 As described above, in the induction heating cooker of the present embodiment, the drive power source (for example, the first) based on the negative output of each induction heating means (for example, the first induction heating means 4a) of each inverter (for example, the inverter 4). By providing the drive power supply 4b) of 1, it is possible to stably receive the required power supply voltage regardless of the operating conditions of itself and other inverters, so a highly reliable multi-port induction heating cooker can be used. It will be possible to provide.

なお、直流電源３の出力電圧Ｖｏを、各インバータ駆動に必要な電圧に各誘導加熱手段の負出力と整流回路２の負出力間で生じる電位差の最大値以上の電圧を加えた値を上回る値とすれば、各駆動電源は安価な降圧レギュレータ（例えば、ＮＰＮトランジスタと、抵抗器と、ツェナーダイオードで構成する降圧レギュレータ）で構成することができ、各インバータへ駆動電源を追加することでのコストアップを抑制することができる。 The output voltage Vo of the DC power supply 3 exceeds the value obtained by adding the voltage required for driving each inverter to the voltage equal to or greater than the maximum value of the potential difference generated between the negative output of each induction heating means and the negative output of the rectifier circuit 2. If so, each drive power supply can be configured with an inexpensive step-down regulator (for example, a step-down regulator composed of an NPN transistor, a resistor, and a Zener diode), and the cost of adding a drive power supply to each inverter. Up can be suppressed.

また、本実施の形態では、誘導加熱調理器のインバータを２つとしたが、特に２つに限定せずともよく、３つ以上のインバータを備える多口誘導加熱調理器においても、各インバータ毎に個々に駆動電源を備えるよう構成してもよい。 Further, in the present embodiment, the number of inverters of the induction heating cooker is two, but the number of inverters is not particularly limited to two, and even in a multi-port induction heating cooker provided with three or more inverters, each inverter is used. It may be configured to individually include a drive power supply.

また、本実施の形態によれば、電流検知手段での電圧降下が誘導加熱手段へ与える影響が抑制されるため、電流検知手段に抵抗器の端子間に生じる電位差から流れる電流を検出する電位差を生じさせることを前提とした電流検知方式を採用することも可能となり、電流検知手段の回路構成選択の自由度を広げることができる。さらに、整流回路の正出力側
ではなく負出力側に電流検知手段を設けることが可能となるため、電流検知手段を正出力側に設けた場合よりも負出力側に設けることで電流検知手段を他の回路ブロックとの絶縁距離を縮めることができ、多口誘導加熱調理器の小型化に寄与することができる。 Further, according to the present embodiment, since the influence of the voltage drop in the current detecting means on the induced heating means is suppressed, the current detecting means is provided with a potential difference for detecting the current flowing from the potential difference generated between the terminals of the resistor. It is also possible to adopt a current detection method that is premised on the occurrence, and it is possible to expand the degree of freedom in selecting the circuit configuration of the current detection means. Furthermore, since it is possible to provide the current detecting means on the negative output side instead of the positive output side of the rectifier circuit, the current detecting means can be provided by providing the current detecting means on the negative output side rather than on the positive output side. The insulation distance from other circuit blocks can be shortened, which can contribute to the miniaturization of the multi-mouth induction heating cooker.

以上のように、本発明にかかる誘導加熱調理器は、調理器のみならず複数の誘導加熱手段を備える機器に応用することが可能である。 As described above, the induction heating cooker according to the present invention can be applied not only to a cooker but also to a device provided with a plurality of induction heating means.

１ 商用電源
２ 整流回路
３ 直流電源
４ 第１のインバータ
４ａ 第１の誘導加熱手段
４ｂ 第１の駆動電源
５ 第２のインバータ
５ａ 第２の誘導加熱手段
５ｂ 第２の駆動電源
６ 制御手段
1 Commercial power supply 2 Rectifier circuit 3 DC power supply 4 First inverter 4a First induction heating means 4b First drive power supply 5 Second inverter 5a Second induction heating means 5b Second drive power supply 6 Control means

Claims (4)

商用電源を整流する整流回路と、
前記整流回路の負出力を基準電位とする直流電源と、
複数組のインバータと、を備え、
前記複数組のインバータのそれぞれは、
被加熱物を誘導加熱する誘導加熱手段と、
前記誘導加熱手段の負出力を基準として前記直流電源の出力を前記誘導加熱手段のスイッチング素子へ所定の直流電圧に変換出力する駆動電源と、を組として有する誘導加熱調理器。 A rectifier circuit that rectifies commercial power and
A DC power supply whose reference potential is the negative output of the rectifier circuit,
Equipped with multiple sets of inverters,
Each of the plurality of sets of inverters
Induction heating means that induces heating of the object to be heated,
An induction heating cooker having a drive power source that converts the output of the DC power supply into a predetermined DC voltage to a switching element of the induction heating means with reference to the negative output of the induction heating means. 直流電源は、各駆動電源の出力電圧よりも高い電圧を出力する請求項１に記載の誘導加熱調理器。 The induction heating cooker according to claim 1, wherein the DC power supply outputs a voltage higher than the output voltage of each drive power supply. 駆動電源の入力部に短絡保護手段を備えた請求項１または請求項２に記載の誘導加熱調理器。 The induction heating cooker according to claim 1 or 2, wherein the input portion of the drive power supply is provided with a short-circuit protection means. 整流回路の負出力と各誘導加熱手段との間に各誘導加熱手段に流れる電流を検知する電流検知手段を設けた請求項１から３のいずれか１項に記載の誘導加熱調理器。
The induction heating cooker according to any one of claims 1 to 3, wherein a current detecting means for detecting a current flowing through each induction heating means is provided between the negative output of the rectifier circuit and each induction heating means.
JP2018183096A 2018-09-28 2018-09-28 Induction heating cooker Active JP7045615B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018183096A JP7045615B2 (en) 2018-09-28 2018-09-28 Induction heating cooker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2018183096A JP7045615B2 (en) 2018-09-28 2018-09-28 Induction heating cooker

Publications (2)

Publication Number Publication Date
JP2020053323A JP2020053323A (en) 2020-04-02
JP7045615B2 true JP7045615B2 (en) 2022-04-01

Family

ID=69997675

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2018183096A Active JP7045615B2 (en) 2018-09-28 2018-09-28 Induction heating cooker

Country Status (1)

Country Link
JP (1) JP7045615B2 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006066240A (en) 2004-08-27 2006-03-09 Mitsui Eng & Shipbuild Co Ltd Induction heating method and induction heating device
JP2006164525A (en) 2004-12-02 2006-06-22 Matsushita Electric Ind Co Ltd Induction heating device
JP2010199007A (en) 2009-02-27 2010-09-09 Panasonic Corp Multi-port heating cooker
JP2011193705A (en) 2010-03-17 2011-09-29 Hitachi Appliances Inc Gate drive circuit of voltage drive type semiconductor element and power converter
WO2013042287A1 (en) 2011-09-20 2013-03-28 三菱電機株式会社 Induction heating cooker
JP2014029807A (en) 2012-07-31 2014-02-13 Mitsui Eng & Shipbuild Co Ltd Induction heating apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006066240A (en) 2004-08-27 2006-03-09 Mitsui Eng & Shipbuild Co Ltd Induction heating method and induction heating device
JP2006164525A (en) 2004-12-02 2006-06-22 Matsushita Electric Ind Co Ltd Induction heating device
JP2010199007A (en) 2009-02-27 2010-09-09 Panasonic Corp Multi-port heating cooker
JP2011193705A (en) 2010-03-17 2011-09-29 Hitachi Appliances Inc Gate drive circuit of voltage drive type semiconductor element and power converter
WO2013042287A1 (en) 2011-09-20 2013-03-28 三菱電機株式会社 Induction heating cooker
JP2014029807A (en) 2012-07-31 2014-02-13 Mitsui Eng & Shipbuild Co Ltd Induction heating apparatus

Also Published As

Publication number Publication date
JP2020053323A (en) 2020-04-02

Similar Documents

Publication Publication Date Title
KR100229507B1 (en) Switching mode power supplier having function of protecting circuit from abnormal voltage
US7440295B2 (en) Switching mode power supply with active load detection function, and switching method thereof
JP5230182B2 (en) Switching power supply
JPWO2013099085A1 (en) Induction heating cooker
JP2009177935A (en) Dc power supply
JP2015013096A (en) Induction heating apparatus
US9924570B2 (en) Isolated active circuit for measuring the current of an illuminant on the secondary side
JP6168454B2 (en) Induction heating device
CN109245508B (en) Electronic device
JP5671732B2 (en) Induction heating device
JP7045615B2 (en) Induction heating cooker
KR102030721B1 (en) Electromagnetic inductive power supply apparatus
JP7081518B2 (en) Voltage abnormality detection device and drive device
JP2009130975A (en) Power unit
EP2804303A1 (en) Switching power supply circuit
JP2014023328A (en) Non-contact power-feeding device
JP5495679B2 (en) Power circuit
JP6344086B2 (en) Control device
JP3447975B2 (en) Switching power supply circuit
JP7231206B2 (en) Switching power supply and motor drive control system using it
JP3916235B2 (en) Power supply device
WO2022080237A1 (en) Electric power conversion device and method of controlling electric power conversion device
KR102334524B1 (en) Switching mode power supply
JP2736059B2 (en) Inverter device
JP5401045B2 (en) Power circuit

Legal Events

Date Code Title Description
RD01 Notification of change of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7421

Effective date: 20190124

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20210106

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20211117

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20211124

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20211224

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20220201

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20220214

R151 Written notification of patent or utility model registration

Ref document number: 7045615

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151