JPH0597088U - Induction cooker - Google Patents
Induction cookerInfo
- Publication number
- JPH0597088U JPH0597088U JP3880692U JP3880692U JPH0597088U JP H0597088 U JPH0597088 U JP H0597088U JP 3880692 U JP3880692 U JP 3880692U JP 3880692 U JP3880692 U JP 3880692U JP H0597088 U JPH0597088 U JP H0597088U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- small load
- input
- detection
- power supply
- 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.)
- Granted
Links
- 230000006698 induction Effects 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 60
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Abstract
(57)【要約】
【構成】 交流電源１から直流電源に変換する整流回路
２と、この直流電源を高周波電流に変換し加熱コイル５
に供給するインバータ回路９と、このインバータ回路９
を制御する制御回路１２とからなる誘導加熱調理器にお
いて、制御回路１２の制御に小物負荷検出用入力電力レ
ベルを設定させる小物負荷検知レベル設定手段１３を設
けた。
【効果】 小物負荷を検出する場合は、制御回路によっ
て設定されている入力電力レベルにかかわらず、一時的
に小物負荷検出用入力電力レベルに固定し、小物負荷検
知レベル設定手段が簡略化出来、またマイクロコンピュ
ータの内部演算によって小物負荷の検出を行う場合で
も、入力電力レベルの変化に対応する小物負荷検知レベ
ルの補正を行う必要がなくなり、処理時間が大幅に短縮
出来る。
(57) [Summary] [Structure] Rectifier circuit 2 for converting AC power supply 1 into DC power supply, and heating coil 5 for converting this DC power supply into high frequency current.
Inverter circuit 9 for supplying to
In the induction heating cooker including the control circuit 12 for controlling the electric power supply, the small load detection level setting means 13 for setting the input power level for detecting the small load is provided for the control of the control circuit 12. [Effect] When detecting a small load, the small load detection level setting means can be simplified by temporarily fixing the small load detection input power level regardless of the input power level set by the control circuit. Further, even when the small load is detected by the internal calculation of the microcomputer, it is not necessary to correct the small load detection level corresponding to the change in the input power level, and the processing time can be greatly shortened.
Description
【０００１】[0001]
本考案は、小物負荷検出を行う誘導加熱調理器に関するものである。 The present invention relates to an induction heating cooker that detects a small load.
【０００２】[0002]
加熱コイルに高周波電流を印加し高周波の磁束を発生させて加熱コイルと磁気 結合した負荷に渦電流を誘起させて、そのジュール熱により負荷を加熱させる誘 導加熱調理器において、ナイフやスプーン等の小物負荷が加熱された場合は火傷 等の恐れがあるので、加熱動作中の入力電流と、入力電圧や、加熱コイルの共振 電圧とを比較することにより判別する小物負荷検出方法が、特公昭５９−３２８ ７８号公報、特公昭６１−２９１１７号公報等で提案されていた。 A high frequency current is applied to the heating coil to generate a high frequency magnetic flux to induce an eddy current in a load that is magnetically coupled to the heating coil, and the Joule heat heats the load. When a small load is heated, there is a risk of burns, so a small load detection method that determines by comparing the input current during heating operation with the input voltage or the resonance voltage of the heating coil is disclosed in Japanese Patent Publication No. 59-59. It was proposed in Japanese Patent Publication No. 328-78, Japanese Patent Publication No. 61-29117, and the like.
【０００３】 また、制御回路のマイクロコンピュータ化が進み、インバータ回路の入力電圧 と入力電流を入力し、内部演算によって小物負荷検出を行うものが増大している 。（例えば特開平３−１１４１９６号公報）In addition, as control circuits have become more and more microcomputerized, the number of small circuit loads that are input by inputting an input voltage and an input current of an inverter circuit and increasing the number is increasing. (For example, JP-A-3-114196)
【０００４】[0004]
しかしながら、加熱動作中の入力電流と、入力電圧や、加熱コイルの共振電圧 とを比較する方法では、入力電圧を検出するために抵抗分圧回路が必要であり制 御回路が非絶縁化になっていた。また、入力電圧の変動により入力電力が変化す ると検出レベルが変動するので検出値に対して補正を加えないと正確な小物負荷 検出が行えないという問題点があった。 However, in the method of comparing the input current during the heating operation with the input voltage or the resonance voltage of the heating coil, a resistance voltage divider circuit is required to detect the input voltage, and the control circuit is not insulated. Was there. In addition, since the detection level changes when the input power changes due to changes in the input voltage, there is a problem that accurate small object load detection cannot be performed unless the detected value is corrected.
【０００５】 また、マイクロコンピュータによって小物負荷検出を行う場合は、Ａ／Ｄ変換 や内部演算、入力電力に対する小物負荷検出レベルの補正などで処理時間が大幅 にかかってしまい、他の処理に影響を与える場合があった。Further, when the small object load is detected by the microcomputer, a large amount of processing time is required due to A / D conversion, internal calculation, correction of the small object load detection level with respect to input power, and other processing is affected. There was a case to give.
【０００６】 また、ジャー炊飯器やジャーポット、あるいはホットプレートなどに誘導加熱 方式を使用する場合、使用中に負荷が変動し小物負荷と判断されるような場合は ほとんど無いと考えられる。したがって、一般の電磁調理器の場合とは異なり、 小物負荷の検出は常時行わなくても構わない場合が多い。Further, when the induction heating method is used for a jar rice cooker, a jar pot, a hot plate, etc., it is considered that there is almost no case where the load fluctuates during use and is judged to be a small load. Therefore, unlike the case of a general electromagnetic cooker, in many cases it is not necessary to always detect the small load.
【０００７】[0007]
本考案は上記課題を解決するためになされたものであり、交流電源から直流電 源に変換する整流回路と、この直流電源を高周波電流に変換し加熱コイルに供給 するインバータ回路と、このインバータ回路を制御する制御回路と、交流電源の 入力電流又はインバータ回路の入力電流を検出する入力電流検出回路とからなる 誘導加熱調理器において、小物負荷検出用入力電力レベルを設定し制御回路に制 御させる小物負荷検知レベル設定手段を制御回路に入力し、入力電力レベルにお ける入力電流検出回路が検出した検出値と、小物負荷検知レベルを比較して小物 負荷を検出するものである。 The present invention has been made to solve the above problems, and includes a rectifier circuit that converts an AC power supply into a DC power supply, an inverter circuit that converts the DC power supply into a high-frequency current and supplies it to a heating coil, and this inverter circuit. In an induction heating cooker consisting of a control circuit for controlling and an input current detecting circuit for detecting the input current of an AC power supply or the input current of an inverter circuit, a small item that sets the input power level for small item load detection and controls it by the control circuit. The load detection level setting means is input to the control circuit, and the small load is detected by comparing the detection value detected by the input current detection circuit at the input power level with the small load detection level.
【０００８】[0008]
上記のように構成したことにより、小物負荷を検出する場合は、制御回路によ って設定されている入力電力レベルにかかわらず、一時的に小物負荷検出用入力 電力レベルに設定し、入力電力レベルにおける入力電流検出回路が検出した検出 値と、小物負荷検知レベルを比較して小物負荷を検出する作用をする。 With the above configuration, when detecting a small object load, the input power level for detecting small object load is temporarily set regardless of the input power level set by the control circuit. The small load is detected by comparing the detection value detected by the input current detection circuit at the level with the small load detection level.
【０００９】[0009]
以下本考案の一実施例について図面に従って説明する。図１は、本考案の一実 施例を施した誘導加熱調理器のブロック回路図であり、図２は同小物負荷検出例 である。 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block circuit diagram of an induction heating cooker to which an embodiment of the present invention is applied, and FIG. 2 is an example of load detection of the same small article.
【００１０】 図において、交流電源１を整流回路２に入力し直流電源を構成する。この整流 回路２の出力側にはチョークコイル３及び平滑コンデンサ４とで構成される平滑 回路と、加熱コイル５と共振コンデンサ６で構成される共振回路と、ダンパーダ イオード７と、スイッチング素子８とからなるインバータ回路９が接続されてい る。In the figure, an AC power supply 1 is input to a rectifier circuit 2 to form a DC power supply. On the output side of this rectifying circuit 2, a smoothing circuit composed of a choke coil 3 and a smoothing capacitor 4, a resonance circuit composed of a heating coil 5 and a resonance capacitor 6, a damper diode 7 and a switching element 8 are provided. Inverter circuit 9 is connected.
【００１１】 カレントトランスＣＴによりインバータ回路９の１次側の入力電流を検出し入 力電流検出回路１０に入力し、インバータ回路９の入力電圧を入力電圧検出回路 １１にて検出し、制御回路１２に入力する。前記入力電流検出回路１０によって 変換した電圧信号と、小物負荷検知レベル設定手段１３の設定出力を小物検知手 段１４に入力する。この小物検知手段１４は入力電流検出回路１０によって変換 した電圧信号と小物負荷検知レベル設定手段１３の設定出力とを比較し加熱に適 さない小物負荷や、負荷の無い状態を検出し制御回路１２に出力する。なお、小 物検知手段１４の出力は制御回路１２が小物負荷検知火力レベルを設定している 場合以外は出力を停止する。制御回路１２は使用者の操作に基づく、あるいは動 作シーケンスにしたがった火力設定や、報知等を行う。The input current on the primary side of the inverter circuit 9 is detected by the current transformer CT and input to the input current detection circuit 10, the input voltage of the inverter circuit 9 is detected by the input voltage detection circuit 11, and the control circuit 12 To enter. The voltage signal converted by the input current detection circuit 10 and the setting output of the small article load detection level setting means 13 are input to the small article detection means 14. This small article detection means 14 compares the voltage signal converted by the input current detection circuit 10 with the set output of the small article load detection level setting means 13 to detect a small article load which is not suitable for heating or a state without a load, and the control circuit 12 is detected. Output to. The output of the small object detection means 14 is stopped except when the control circuit 12 sets the small object load detection thermal power level. The control circuit 12 sets the heat power based on the operation of the user or according to the operation sequence, and performs notification.
【００１２】 前記制御回路１２の出力する火力設定信号を通電率設定回路１５に入力し、こ の通電率設定回路１５が出力するスイッチング素子８駆動用のパルス信号をドラ イブ回路１６に入力し、ドライブ回路１６はこのパルス信号をスイッチング素子 ８を駆動するのに十分な駆動信号に変換しスイッチング素子８に出力する。The thermal power setting signal output from the control circuit 12 is input to the duty ratio setting circuit 15, and the pulse signal for driving the switching element 8 output from the duty ratio setting circuit 15 is input to the drive circuit 16. The drive circuit 16 converts this pulse signal into a drive signal sufficient to drive the switching element 8 and outputs it to the switching element 8.
【００１３】 次に小物負荷検出例を示す動作シーケンスを図２を用いて説明する。Next, an operation sequence showing an example of small load detection will be described with reference to FIG.
【００１４】 この動作は加熱開始は徐々に入力電力を増し、最大電力で一定時間加熱した後 、２回入力電力を下げてから加熱停止するものである。横軸は時間、縦軸はイン バータ回路の入力電力を示し、実線は通常の負荷の場合を、点線は途中で負荷が 取り去られた場合を示す。なお、小物負荷を検出した場合は、検出時点で加熱を 停止する。In this operation, when the heating is started, the input electric power is gradually increased, the maximum electric power is heated for a certain period of time, and then the input electric power is reduced twice, and then the heating is stopped. The horizontal axis shows the time, the vertical axis shows the input power of the inverter circuit, the solid line shows the case of a normal load, and the dotted line shows the case of the load being removed midway. When a small load is detected, heating is stopped at the time of detection.
【００１５】 加熱中はｔａの期間動作シーケンスにしたがった加熱パタンにより通電し、ｔ ｂの期間は小物検出用入力電力レベルに設定し、これらのパタンを繰り返す。During heating, electricity is supplied by the heating pattern according to the operation sequence for the period of ta, the input power level for small object detection is set for the period of t b, and these patterns are repeated.
【００１６】 区間Ａ（Ｔ0からＴ1まで）は徐々に通電率を上げていく、いわゆるソフトスタ ートである。また、Ｔ2からＴ3、Ｔ4からＴ5は通電率の変化を滑らかに行う部分 である。The section A (from T 0 to T 1 ) is a so-called soft start in which the duty ratio is gradually increased. In addition, T 2 to T 3 and T 4 to T 5 are portions where the change of the duty ratio is performed smoothly.
【００１７】 区間Ｂ（Ｔ1からＴ2）は最大レベルによる通電である。The section B (T 1 to T 2 ) is energized at the maximum level.
【００１８】 区間Ｃ（Ｔ3からＴ4）は小物検出用入力電力レベルと同じ電力レベルの場合で ある。The section C (T 3 to T 4 ) has the same power level as the input power level for small object detection.
【００１９】 区間Ｄ（Ｔ5からＴ6）は小物検出用入力電力レベルより低い電力レベルの場合 である。Section D (T 5 to T 6 ) is a case where the power level is lower than the input power level for small object detection.
【００２０】 なお、区間Ａにおいて、ソフトスタート処理の途中でｔａ経過し、ｔｂ期間小 物検知動作を行う。その後ソフトスタート処理を継続する。In the section A, ta has elapsed during the soft start process, and the small object detection operation is performed for the tb period. After that, the soft start process is continued.
【００２１】 各区間において、小物検出用入力電力レベルに設定されている期間に小物負荷 あるいは負荷無しの状態になっている場合は、入力電流が減少するので、その検 出レベルを図中の小物負荷検知レベルとする（点線Ｂ′、Ｃ′、Ｄ′）。したが って、小物負荷検出期間中は小物負荷検知レベルに対して入力電流が大きいか小 さいかだけを判断するだけでよい。In each section, when the small object load or no load is present during the period when the input power level for small object detection is set, the input current decreases, so the detection level is set to the small object in the figure. The load detection level is set (dotted lines B ', C', D '). Therefore, it is only necessary to judge whether the input current is large or small with respect to the small load detection level during the small load detection period.
【００２２】 本例のように、一定時間ごとに小物負荷検出を行う場合にはｔａに対してｔｂ を短くすることによって、本来の加熱パタンを損なうことなく調理することが出 来る。また、構造的に負荷が取外しにくいものなどはｔａを長くし小物負荷検出 回数を減らす、あるいは加熱シーケンスを持つものについてはそのシーケンスの 切り替え時に小物負荷検出を行うなどの方法をとればよい。When the small object load is detected at regular intervals as in the present example, it is possible to cook without damaging the original heating pattern by shortening tb with respect to ta. In addition, if the load is structurally difficult to remove, ta can be lengthened to reduce the number of small load detections, or for those with a heating sequence, small load detection can be performed when the sequence is switched.
【００２３】 なお、本実施例では、入力電流は交流電源側１の電流を検出しているが、整流 後のインバータ回路９の入力電流等を検出しても同様の小物負荷検出を行なうこ とができる。また、これらの回路構成の一部をマイクロコンピュータに内蔵され ている付加回路にて構成することも可能であり、例えばマイクロコンピュータに 前記小物負荷検知レベル設定手段１３の代わりに小物負荷相当のディジタルデー タを予め記憶しておき、そのデータと入力電流検出回路１０の出力をＡ／Ｄ変換 した値とを比較して小物負荷を判別する（図示せず）。その場合は部品点数を削 減することができる。In this embodiment, the input current is the current on the AC power supply side 1. However, the same small load detection can be performed by detecting the input current of the inverter circuit 9 after rectification. You can It is also possible to configure a part of these circuit configurations by an additional circuit built in the microcomputer. For example, instead of the accessory load detection level setting means 13 in the microcomputer, a digital data equivalent to the accessory load is provided. Data is stored in advance, and the small load is determined by comparing the data with the value obtained by A / D converting the output of the input current detection circuit 10 (not shown). In that case, the number of parts can be reduced.
【００２４】[0024]
本考案は制御回路の制御に小物負荷検出用入力電力レベルを設定させる小物負 荷検知レベル設定手段を設け、小物負荷を検出する場合は、制御回路によって設 定されている入力電力レベルにかかわらず、一時的に小物負荷検出用入力電力レ ベルに固定し、小物負荷検知レベル設定手段が簡略化出来、またマイクロコンピ ュータの内部演算によって小物負荷の検出を行う場合でも、入力電力レベルの変 化に対応する小物負荷検知レベルの補正を行う必要がなくなり、処理時間が大幅 に短縮出来る。 The present invention is provided with small load detection level setting means for setting the input power level for small load detection in the control of the control circuit, and when detecting a small load, regardless of the input power level set by the control circuit. By temporarily fixing the input power level for small load detection, the small load detection level setting means can be simplified, and even when the small load is detected by internal calculation of the micro computer, the input power level can be changed. It is not necessary to correct the small object load detection level corresponding to, and the processing time can be greatly shortened.
【図１】本考案の一実施例を示す誘導加熱調理器のブロ
ック回路図である。FIG. 1 is a block circuit diagram of an induction heating cooker showing an embodiment of the present invention.
【図２】同じく小物負荷検出例を示す図である。FIG. 2 is a diagram showing an example of small object load detection in the same manner.
１ 交流電源 ２ 整流回路 ５ 加熱コイル ９ インバータ回路 １０ 入力電流検出回路 １２ 制御回路 １３ 小物負荷検知レベル設定手段 1 AC power supply 2 Rectifier circuit 5 Heating coil 9 Inverter circuit 10 Input current detection circuit 12 Control circuit 13 Small load detection level setting means
Claims (3)
流回路(２)と、この直流電源を高周波電流に変換し加熱
コイル(５)に供給するインバータ回路(９)と、このイン
バータ回路(９)の入力電力レベルを制御する制御回路
(１２)と、入力電流を検出する入力電流検出回路(１０)
とからなる誘導加熱調理器において、小物負荷検出用入
力電力レベルを設定し前記制御回路(１２)に制御させる
小物負荷検知レベル設定手段(１３)を制御回路(１２)に
入力し、小物負荷を検出する場合は、制御回路(１２)に
よって設定されている入力電力レベルにかかわらず、一
時的に小物負荷検出用入力電力レベルに設定し、入力電
力レベルにおける入力電流検出回路(９)が検出した検出
値と、小物負荷検知レベルを比較して小物負荷を検出す
ることを特徴とする誘導加熱調理器。1. A rectifier circuit (2) for converting an AC power supply (1) into a DC power supply, an inverter circuit (9) for converting this DC power supply into a high frequency current and supplying it to a heating coil (5), and this inverter circuit. (9) Control circuit for controlling input power level
(12) and an input current detection circuit for detecting the input current (10)
In the induction heating cooker consisting of and, the small load detection level setting means (13) for setting the input power level for small load detection and causing the control circuit (12) to control is input to the control circuit (12) to load the small load. When detecting, regardless of the input power level set by the control circuit (12), it is temporarily set to the small load detection input power level, and the input current detection circuit (9) at the input power level detects it. An induction heating cooker characterized by detecting a small load by comparing a detection value with a small load detection level.
電流検出回路(１０)とした請求項１記載の誘導加熱調理
器。2. The induction heating cooker according to claim 1, wherein the input current detection circuit (10) detects an input current of the AC power supply (1).
る入力電流検出回路(１０)とした請求項１記載の誘導加
熱調理器。3. The induction heating cooker according to claim 1, wherein the input current detection circuit (10) detects an input current of the inverter circuit (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992038806U JP2594632Y2 (en) | 1992-06-09 | 1992-06-09 | Induction heating cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992038806U JP2594632Y2 (en) | 1992-06-09 | 1992-06-09 | Induction heating cooker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0597088U true JPH0597088U (en) | 1993-12-27 |
| JP2594632Y2 JP2594632Y2 (en) | 1999-05-10 |
Family
ID=12535541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992038806U Expired - Lifetime JP2594632Y2 (en) | 1992-06-09 | 1992-06-09 | Induction heating cooker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2594632Y2 (en) |
-
1992
- 1992-06-09 JP JP1992038806U patent/JP2594632Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2594632Y2 (en) | 1999-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2003257604A (en) | Inverter cooker | |
| JP2001196156A (en) | Induction heating cooker | |
| JP4193095B2 (en) | Induction heating cooker | |
| JP2685212B2 (en) | Electromagnetic cooker | |
| JP2811609B2 (en) | Pot detection device for induction heating cooker | |
| JPH0597088U (en) | Induction cooker | |
| KR20210015322A (en) | Induction heating device | |
| JP3376227B2 (en) | Inverter device | |
| JP4706307B2 (en) | Induction heating device | |
| JP2562986B2 (en) | Induction heating cooker | |
| KR100285640B1 (en) | Initial operation circuit of induction cooker | |
| JPH05109466A (en) | Induction-heated cooking appliance | |
| JP3931038B2 (en) | Induction heating cooker | |
| EP4040918B1 (en) | Induction heating apparatus and method for controlling the same | |
| JPH05109467A (en) | Induction heating cooker | |
| JPH07288181A (en) | Induction heating cooker | |
| JPH08148266A (en) | Induction heating cooker | |
| JP4613687B2 (en) | Induction heating device | |
| JP3799161B2 (en) | Induction heating cooker | |
| JP2001326066A (en) | Induction heating cooker | |
| JP3733525B2 (en) | Induction heating cooker | |
| JP2001126853A (en) | Induction heating cooker | |
| JP2916720B2 (en) | Induction heating cooker | |
| US20240039387A1 (en) | Power converting device and home appliance including the same | |
| JP2685227B2 (en) | Electromagnetic cooker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R323111 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R323111 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R323111 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080305 Year of fee payment: 9 |