JPS6132793B2 - - Google Patents
Info
- Publication number
- JPS6132793B2 JPS6132793B2 JP54098218A JP9821879A JPS6132793B2 JP S6132793 B2 JPS6132793 B2 JP S6132793B2 JP 54098218 A JP54098218 A JP 54098218A JP 9821879 A JP9821879 A JP 9821879A JP S6132793 B2 JPS6132793 B2 JP S6132793B2
- Authority
- JP
- Japan
- Prior art keywords
- detection
- pot
- heating coil
- output
- detection circuit
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/05—Heating plates with pan detection means
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cookers (AREA)
Description
【発明の詳細な説明】
本発明は高周波誘導加熱調理器の鍋位置検知に
関するもので、その目的とするところは、鍋が加
熱コイルの中心から外れた場合、すみやかに検知
しようとするものである。[Detailed Description of the Invention] The present invention relates to pot position detection in a high frequency induction heating cooker, and its purpose is to promptly detect when the pot is off the center of the heating coil. .
一般に誘導加熱調理器の天板には加熱コイルの
上面で鍋が効率よく加熱するための位置を示す、
放射型、あるいは円形のマークが印刷してある。
従つて、鍋がこのマークよりずれると加熱効率が
低下し、かつ、加熱コイルからの放射磁束も増加
し電波障害も多くなる。更に、鍋のずれた部分の
加熱コイルの上面に、鍋と同時にスプーン、ナイ
フ等の小物負荷を置かれた場合、加熱され極めて
危険である。本発明はこの点にかんがみ、鍋が加
熱コイルの中心から外れた場合、加熱コイルから
放射される磁束の不平衡成分を加熱コイルの周辺
に配設した複数個の検知コイルの起電力により検
知しようとするものである。 Generally, the top plate of an induction heating cooker shows the position on the top of the heating coil for efficient heating of the pot.
A radial or circular mark is printed on it.
Therefore, if the pot deviates from this mark, the heating efficiency will decrease, and the radiated magnetic flux from the heating coil will also increase, causing more radio wave interference. Furthermore, if a small object such as a spoon or knife is placed on the upper surface of the heating coil in a misaligned part of the pot at the same time as the pot, it will heat up and be extremely dangerous. In view of this point, the present invention attempts to detect the unbalanced component of the magnetic flux radiated from the heating coil by the electromotive force of a plurality of detection coils disposed around the heating coil when the pot deviates from the center of the heating coil. That is.
以下、本発明を実施例に従がい詳述する。第１
図は本発明の検知コイルの配置の一実施例を示す
構成図。第２図は第１図の構成図を側面からみた
構成図である。第１図、第２図において、１は商
用電源、２は商用電源１を高周波電力に変換する
インバータ装置、３は加熱コイル、４は適性材質
である磁性鍋を検出するための永久磁石、５，
６，７，８は検知コイルで、４ケ夫々約90度の角
度を持つて配置されている。第２図には、そのう
ち２ケを図示している。９は適性鍋検知スイツチ
で鍋の載置、除去による永久磁石４の上下により
開閉し、図面では示していないが、その接点出力
はインバータ装置２へ入力され加熱動作のオン、
オフを制御するものである。 Hereinafter, the present invention will be described in detail according to examples. 1st
The figure is a configuration diagram showing one embodiment of the arrangement of sensing coils of the present invention. FIG. 2 is a side view of the configuration shown in FIG. 1. In FIGS. 1 and 2, 1 is a commercial power source, 2 is an inverter device that converts the commercial power source 1 into high-frequency power, 3 is a heating coil, 4 is a permanent magnet for detecting a magnetic pot made of suitable material, and 5 ，
6, 7, and 8 are detection coils, each of which is placed at an angle of about 90 degrees. FIG. 2 shows two of them. Reference numeral 9 denotes a suitable pot detection switch, which is opened and closed by the vertical movement of the permanent magnet 4 when a pot is placed or removed.Although not shown in the drawing, its contact output is input to the inverter device 2 to turn on and off the heating operation.
This is to control off.
第３図、第４図は本案の検知コイルの配置の他
の実施例を示す構成図である。第３図は加熱コイ
ル３からの放射磁束の、加熱コイル３の中心軸に
直交する方向成分の不平衡を検知しようとするも
ので部品番号及び名称、機能は第１図と同一であ
る。第４図は、加熱コイル３の下面に設けられた
漏えい磁束減少用フエライトコア１０，１１，１
２，１３に、検知コイル５，６，７，８を夫々巻
きつけたもので検知出力の増大をねらつたもので
ある。 FIGS. 3 and 4 are configuration diagrams showing other embodiments of the arrangement of the detection coils of the present invention. FIG. 3 is intended to detect the unbalance of the component of the radiated magnetic flux from the heating coil 3 in a direction perpendicular to the central axis of the heating coil 3, and the part numbers, names, and functions are the same as in FIG. 1. FIG. 4 shows ferrite cores 10, 11, 1 for reducing leakage magnetic flux provided on the lower surface of the heating coil 3.
Detection coils 5, 6, 7, and 8 are wound around coils 2 and 13, respectively, with the aim of increasing the detection output.
以上の検知コイルの構成において、本発明の具
体的な内容について説明する。第５図、第６図
は、本案検知コイル５〜８の接続方法と、検知コ
イル５〜８に接続される検知回路について示した
ものである。第５図、第６図に於いて、１４はビ
ーク電圧検知回路、１５はレベル比較回路、１６
は単安定マルチバイブレータである。又、図中の
Aaはピーク電圧検知回路１４の出力電圧であ
る。９は前述の第２図の適性鍋検知スイツチの接
点でオンで加熱停止、オフで加熱開始するもので
ある。第６図の１７はピーク電圧検知回路である
が、第５図のピーク電圧検知回路１４と回路構成
が異なるため別番号を附してある。又、第５図と
第６図の構成上の差異は検知コイル５〜８の接続
方法で、第５図は対向する２組の検知コイルを
夫々、電圧が打消し合うように接続したもの、第
６図は検知コイル５〜８の電圧が総て打消し合う
よう４ケ直列接続している点である。 Regarding the configuration of the detection coil described above, the specific contents of the present invention will be explained. 5 and 6 show a method of connecting the detection coils 5 to 8 according to the present invention and a detection circuit connected to the detection coils 5 to 8. In FIGS. 5 and 6, 14 is a peak voltage detection circuit, 15 is a level comparison circuit, and 16 is a peak voltage detection circuit.
is a monostable multivibrator. Also, in the diagram
Aa is the output voltage of the peak voltage detection circuit 14. Reference numeral 9 denotes a contact point of the suitable pot detection switch shown in FIG. 2, which stops heating when turned on and starts heating when turned off. Reference numeral 17 in FIG. 6 is a peak voltage detection circuit, which is given a different number because its circuit configuration is different from that of the peak voltage detection circuit 14 in FIG. The difference in structure between FIG. 5 and FIG. 6 is the method of connecting the detection coils 5 to 8. In FIG. 5, two sets of opposing detection coils are connected so that their voltages cancel each other out. FIG. 6 shows that four detection coils 5 to 8 are connected in series so that their voltages all cancel each other out.
以上の構成において、第５図、第６図の動作を
第１図、第２図及び、第８図、第９図の動作特性
図を用いて説明する。第８図は、鍋の加熱コイル
３の中心からの移動距離とピーク電圧検知回路１
４又は１７の出力電圧Vaと、適性鍋検知スイツ
チ９の動作を示したものである。第９図は、第５
図、第６図の全体制御系の動作を鍋の載置位置を
加熱コイル３の中心から連続的にずらして、再び
中心へ戻した時の特性図で、図中のＡは検知電圧
Vaと、レベル比較器１５の基準電圧ＶTHを示し
ている。Ｂは適性鍋検知スイツチ９の動作を示し
ている。 In the above configuration, the operations shown in FIGS. 5 and 6 will be explained using the operation characteristic diagrams shown in FIGS. 1, 2, and 8 and 9. Figure 8 shows the moving distance from the center of the heating coil 3 of the pot and the peak voltage detection circuit 1.
4 or 17 output voltage Va and the operation of the suitable pot detection switch 9 are shown. Figure 9 shows the fifth
Figure 6 is a characteristic diagram of the operation of the overall control system when the placement position of the pot is continuously shifted from the center of the heating coil 3 and returned to the center again, and A in the figure is the detection voltage.
Va and the reference voltage V TH of the level comparator 15 are shown. B shows the operation of the suitable pot detection switch 9.
今、鍋の中心が加熱コイル３の中心に載置され
ている場合、加熱コイル３から放射する磁束はほ
ぼ均一に鍋を通過し、加熱コイル３へ戻る。従つ
て検知コイル５〜８にはほぼ同レベルの検知電圧
が発生する。そして、この検知電圧は検知コイル
５〜８が夫々電圧を打消し合う極性に接続されて
いるので検知電圧は非常に小さな値になる。（理
論的には零になるが、実際には鍋のそり、加熱コ
イルの傾き、加熱コイルの巻線精度等で磁束のア
ンバランスが発生し、わずかな電圧が発生する。
第８図のイ点の電圧。）そして、この検知コイル
出力電圧は小さいためピーク電圧検知回路１４又
は１７の出力電圧Vaは非常に小さく、レベル比
較回路１５の基準電圧ＶTHに達しないため、レベ
ル比較回路１５は作動せず、従つて、単安定マル
チバイブレータ１６も作動しない。このことはイ
ンバータ装置２は連続した加熱状態にあることを
意味している。一方、適性鍋検知スイツチ９は、
鍋が加熱コイル３の中心上に置かれているため、
永久磁石４が鍋に吸引し、接点９は開離状態であ
る。すなわち、鍋が加熱コイルの中心上にある場
合には第９図のａ点迄の動作となる。 Now, when the center of the pot is placed on the center of the heating coil 3, the magnetic flux radiated from the heating coil 3 passes through the pot almost uniformly and returns to the heating coil 3. Therefore, detection voltages of approximately the same level are generated in the detection coils 5 to 8. This detection voltage has a very small value because the detection coils 5 to 8 are connected with polarities that cancel each other out. (Theoretically, it becomes zero, but in reality, the warpage of the pot, the inclination of the heating coil, the precision of the winding of the heating coil, etc. can cause an imbalance in the magnetic flux, and a slight voltage is generated.
Voltage at point A in Figure 8. ) Since this detection coil output voltage is small, the output voltage Va of the peak voltage detection circuit 14 or 17 is very small and does not reach the reference voltage V TH of the level comparison circuit 15, so the level comparison circuit 15 does not operate. Therefore, the monostable multivibrator 16 also does not operate. This means that the inverter device 2 is in a continuous heating state. On the other hand, the suitable pot detection switch 9 is
Since the pot is placed on the center of heating coil 3,
The permanent magnet 4 is attracted to the pot, and the contacts 9 are in an open state. That is, when the pot is placed on the center of the heating coil, the operation will be up to point a in FIG. 9.
次に鍋が加熱コイル３の中心から外れた場合、
今、仮に鍋が検知コイル５の方向にずれた場合を
仮定すると、加熱コイル３の磁束は磁気抵抗の小
さい方向、すなわち鍋の方向に集中しようとす
る。そうすると、検知コイル５の誘起電圧は大き
くなり、逆に鍋から離れる検知コイル８は誘起電
圧が小さくなる。このとき、検知コイル６，７に
対しては加熱コイル３と鍋の移動距離に対し位置
関係は変わらないので、鍋がずれた分だけ検知電
圧は小さくなるが、お互いの電圧レベルは同一に
なる。故に、検知コイル５，８に対しては検知電
圧の不平衡のため出力検知電圧が発生し、検知コ
イル６，７については検知電圧が打消し合うため
出力検知電圧の発生は非常に小さい。従つて、ピ
ーク電圧検知回路１４又は１７の出力電圧Va
は、検知コイル５，８の不平衡成分のみを検知
し、その特性は第８図のロに示すようになる。こ
のピーク電圧検知回路１４又は１７の出力電圧
Vaは鍋の移動につれて上昇するため、本案の回
路においては、レベル比較回路１５の基準電圧Ｖ
THに達すると、（第９図のｂ点）、単安定マルチバ
イブレータ１６がトリガされ、単安定マルチバイ
ブレータ１６の動作時間（第９図のt0時間）、イ
ンバータ装置２の動作を停止する。そして、単安
定マルチバイブレータ１６の動作が終了すると、
インバータ装置２は再び加熱動作を開始する。し
かして、鍋がずれた状態であるので、ピーク電圧
検知回路１４又は１７の出力電圧Vaはただちに
基準電圧ＶTH迄上昇し、再び単安定マルチバイブ
レータ１６はトリガされインバータ装置２は発振
を停止する。以上の動作は鍋がずれた状態で繰り
返される。 Next, if the pot comes off the center of the heating coil 3,
Now, assuming that the pot is shifted in the direction of the detection coil 5, the magnetic flux of the heating coil 3 tends to concentrate in the direction of lower magnetic resistance, that is, in the direction of the pot. As a result, the induced voltage in the sensing coil 5 increases, and conversely, the induced voltage in the sensing coil 8 that is away from the pot decreases. At this time, the positional relationship of the detection coils 6 and 7 does not change with respect to the moving distance between the heating coil 3 and the pot, so the detection voltage decreases by the amount that the pot shifts, but the voltage levels are the same. . Therefore, an output detection voltage is generated for the detection coils 5 and 8 due to the unbalance of the detection voltages, and an output detection voltage is generated for the detection coils 6 and 7 because the detection voltages cancel each other out. Therefore, the output voltage Va of the peak voltage detection circuit 14 or 17
detects only the unbalanced components of the detection coils 5 and 8, and its characteristics are as shown in FIG. 8B. The output voltage of this peak voltage detection circuit 14 or 17
Since Va increases as the pot moves, in the proposed circuit, the reference voltage V of the level comparison circuit 15
When TH is reached (point b in FIG. 9), the monostable multivibrator 16 is triggered, and the operation of the inverter device 2 is stopped for the operating time of the monostable multivibrator 16 (time t 0 in FIG. 9). Then, when the operation of the monostable multivibrator 16 ends,
The inverter device 2 starts the heating operation again. Since the pot is in a shifted state, the output voltage Va of the peak voltage detection circuit 14 or 17 immediately rises to the reference voltage VTH , the monostable multivibrator 16 is triggered again, and the inverter device 2 stops oscillating. . The above operation is repeated with the pot shifted.
次に、更に鍋がずらされた場合、今迄、鍋に吸
引していた永久磁石４は落下し、適性鍋検知スイ
ツチの接点９は閉成し（第９図ｃ点）、インバー
タ装置２は単安定マルチバイブレータ１６の状態
いかんにかかわらず、加熱停止状態になる。この
点は、加熱コイル３の上から鍋を完全にとり去つ
た時、加熱コイル３の磁束の分布は鍋を中央に載
置した時と同じようにほぼ均一となるため、検知
不能となるからである。（第８図のハ点参照）
次に、鍋を、加熱コイル３の中心へ戻した時、
第９図ｄ点で示す位置迄、戻されると適性鍋検知
スイツチ９が動き、単安定マルチバイブレータ１
６による間欠的な加熱動作が行なわれ、更に鍋を
中心に戻すと、ピーク電圧検知回路１４又は１７
の出力電圧Vaがレベル比較回路１５の基準電圧
ＶTHに達しなくなつた時点（第９図ｅ点）で連続
的な加熱状態に入り、鍋が完全に加熱コイル３の
中心に戻つた点（第９図点）では、前述の第９
図ａ点と同一になる。以上が本発明の構成動作で
ある。 Next, when the pot is further shifted, the permanent magnet 4 that has been attracting the pot until now falls, the contact 9 of the suitable pot detection switch is closed (point c in Figure 9), and the inverter device 2 is closed. Regardless of the state of the monostable multivibrator 16, the heating is stopped. The reason for this is that when the pot is completely removed from above the heating coil 3, the distribution of magnetic flux in the heating coil 3 becomes almost uniform, just like when the pot is placed in the center, so it becomes undetectable. be. (See point C in Figure 8) Next, when the pot is returned to the center of the heating coil 3,
When returned to the position shown at point d in Figure 9, the suitable pot detection switch 9 moves, and the monostable multivibrator
When the intermittent heating operation by 6 is performed and the pot is further returned to the center, the peak voltage detection circuit 14 or 17
When the output voltage Va no longer reaches the reference voltage V TH of the level comparison circuit 15 (point e in Figure 9), a continuous heating state is entered, and the point at which the pot has completely returned to the center of the heating coil 3 ( (9th figure), the above-mentioned 9th point
It will be the same as point a in the figure. The above is the configuration operation of the present invention.
第７図は第５図のブロツク図を具体回路で構成
したもので、ピーク電圧検知回路１４は、２組の
倍電圧整流回路で構成され、コンデンサ２２，２
３を共通にし、平滑している。１組の倍電圧整流
回路はダイオード１８，１９とコンデンサ２２，
２３、もう１組はダイオード２０，２１とコンデ
ンサ２２，２３で構成され、どちらか検知電圧の
高い方の検知コイルの出力によつて直流出力が得
られるものである。次に、レベル比較回路１５は
電圧比較器２７により構成され、抵抗２５，２６
により基準電圧ＶTHが反転入力へ、前述のピーク
電圧検知回路１４の出力が非反転入力へ接続され
ている。ダイオード２９は電圧比較器２７の出力
がオン状態のとき、次段の単安定マルチバイブレ
ータ１６の動作が影響しないようにしている。単
安定マルチバイブレータ１６は既に良く知られて
いるので構成、動作は省略する。トランジスタ３
７の動作のみについて言及すれば、トリガされな
い通常状態では、オフ状態であり、レベル比較回
路１５からトリガされると、一定時間、オンにな
るよう接続されている。 FIG. 7 shows the block diagram of FIG. 5 constructed with a concrete circuit. The peak voltage detection circuit 14 is composed of two sets of voltage doubler rectifier circuits, and the capacitors 22 and 2
3 is made common and smoothed. One set of voltage doubler rectifier circuit includes diodes 18, 19 and capacitor 22,
23. The other set is composed of diodes 20, 21 and capacitors 22, 23, and a DC output is obtained by the output of the detection coil which has a higher detection voltage. Next, the level comparison circuit 15 includes a voltage comparator 27, and resistors 25 and 26.
Accordingly, the reference voltage V TH is connected to the inverting input, and the output of the peak voltage detection circuit 14 described above is connected to the non-inverting input. The diode 29 prevents the operation of the monostable multivibrator 16 in the next stage from being affected when the output of the voltage comparator 27 is in the on state. Since the monostable multivibrator 16 is already well known, its configuration and operation will be omitted. transistor 3
Referring only to the operation of No. 7, in the normal state without triggering, it is off, and when triggered by the level comparison circuit 15, it is connected to be on for a certain period of time.
本発明は加熱コイルの周辺に設けた複数個の検
知コイルを、それぞれに発生する誘起電圧を互い
に相殺するように接続したので、鍋がずれるとず
れた方の誘起電圧は大きく、逆方向は小さくなつ
て出力巾は広くなり、鍋が適正な位置にあるかど
うかが確実に検知でき、この結果として加熱コイ
ルからの放射磁束の低減による電波障害の低減
と、鍋と同時に置かれた小物負荷に対する安全性
の向上が行えるのである。更に、本発明に於いて
は、検知コイルに外部発振器を設け、その検知電
圧を利用するといつた手段をとらず、加熱コイル
から発生する磁束により検知するため簡素な構成
で、尚かつ、加熱動作中に発生する加熱コイルか
らの強力な磁界により誤動作を招くといつた欠点
がないものである。 In the present invention, a plurality of sensing coils installed around the heating coil are connected so that the induced voltages generated in each coil cancel each other out, so that when the pot shifts, the induced voltage in the shifted direction is large, and the induced voltage in the opposite direction is small. As a result, the output width becomes wider, and it is possible to reliably detect whether the pot is in the correct position.As a result, the radiation magnetic flux from the heating coil is reduced, which reduces radio wave interference, and reduces the possibility of small loads placed at the same time as the pot. Safety can be improved. Furthermore, in the present invention, by providing an external oscillator in the detection coil and using the detection voltage, detection is performed by the magnetic flux generated from the heating coil without using any other means, resulting in a simple configuration and a heating operation. It does not have the disadvantage of causing malfunction due to the strong magnetic field from the heating coil generated inside.
第１図は本発明の一実施例における誘導加熱調
理器の検知コイルの配置を示す構成図、第２図は
同第１図の側面図、第３図、第４図は第１図の検
知コイルの配置を示す他の実施例の構成図、第５
図、第６図は検知コイルの接続と検知回路の実施
例を示すブロツク図、第７図は第５図のブロツク
図を具体化した電気回路図、第８図は検知装置の
鍋移動と検知出力を示す特性図、第９図は検知装
置の鍋移動と全体動作を示すチヤートである。
２……インバータ装置、３……加熱コイル、
５，６，７，８……検知コイル、９……適性鍋検
知スイツチ、１０，１１，１２，１３……フエラ
イトコア、１４……ピーク電圧検知回路、１５…
…レベル比較回路、１６……単安定マルチバイブ
レータ。
Fig. 1 is a configuration diagram showing the arrangement of the detection coil of an induction heating cooker according to an embodiment of the present invention, Fig. 2 is a side view of Fig. 1, and Figs. 3 and 4 are the detection coils of Fig. 1. Block diagram of another embodiment showing the arrangement of the coils, No. 5
Figure 6 is a block diagram showing the connection of the detection coil and an embodiment of the detection circuit, Figure 7 is an electric circuit diagram embodying the block diagram of Figure 5, and Figure 8 is the detection device for pot movement and detection. The characteristic diagram showing the output, FIG. 9, is a chart showing the pan movement and overall operation of the detection device. 2... Inverter device, 3... Heating coil,
5, 6, 7, 8...Detection coil, 9...Applicable pot detection switch, 10, 11, 12, 13...Ferrite core, 14...Peak voltage detection circuit, 15...
...Level comparison circuit, 16... Monostable multivibrator.
Claims (1)
熱コイルの近傍に中心から等距離でかつ等間隔に
配設した複数個の検知コイルにより検出し、各検
知コイルの誘起電圧を互いに相殺するよう接続
し、その出力を検知回路に接続すると共に、この
検知回路の出力にオア接続された磁性鍋を検出す
る適性鍋検知装置の出力よりなり、鍋が加熱コイ
ルの中心から外れた時、磁束の不平衡信号を検知
し、前記検知回路により前記加熱コイルへの通電
を間欠的に行い、更に鍋が外れた時、前記適性鍋
検知装置により前記加熱コイルへの通電を停止す
ることを特徴とする誘導加熱調理器。 ２ 加熱コイルの下面に設置した複数個のフエラ
イトコアに巻きつけた検知コイルにより構成され
たこと特徴とする特許請求の範囲第１項記載の誘
導加熱調理器。 ３ 加熱コイルの近傍に配設された複数個の検知
コイルの対角線上の検知コイルの検知電圧が互い
に打消し合う極性に接続し、その出力をピーク電
圧検知回路の入力に接続したことを特徴とする特
許請求の範囲第１項記載の誘導加熱調理器。 ４ 加熱コイルの近傍に配設された複数個の検知
コイルを互いに検知電圧が打消し合う極性に総て
直列接続し、その出力をピーク電圧検知回路の入
力に接続したことを特徴とする特許請求の範囲第
１項記載の誘導加熱調理器。 ５ ピーク電圧検知回路と、この出力に接続され
た比較回路、この比較回路の出力に接続された単
安定マルチバイブレータより成る検知回路により
構成されたことを特徴とする特許請求の範囲第１
項記載の誘導加熱調理器。[Claims] 1. An alternating magnetic field from a disc-shaped heating coil is detected by a plurality of detection coils disposed near the heating coil at equal distances from the center and at equal intervals, and the induced magnetic field of each detection coil is The voltages are connected so as to cancel each other out, and the output thereof is connected to a detection circuit, and the output of a suitable pot detection device that detects a magnetic pot is or-connected to the output of this detection circuit. When the pot comes off, a magnetic flux imbalance signal is detected, and the detection circuit intermittently energizes the heating coil, and when the pot comes off, the suitable pot detection device stops energizing the heating coil. An induction heating cooker characterized by: 2. The induction heating cooker according to claim 1, characterized in that the induction heating cooker is constituted by a detection coil wound around a plurality of ferrite cores installed on the lower surface of the heating coil. 3. A plurality of detection coils disposed near the heating coil are connected to polarities such that the detection voltages of the diagonal detection coils cancel each other out, and the output thereof is connected to the input of the peak voltage detection circuit. An induction heating cooker according to claim 1. 4. A patent claim characterized in that a plurality of detection coils disposed near the heating coil are all connected in series with polarities such that their detection voltages cancel each other out, and their outputs are connected to the input of a peak voltage detection circuit. The induction heating cooker according to item 1. 5. Claim 1 comprising a peak voltage detection circuit, a comparison circuit connected to the output of the detection circuit, and a detection circuit consisting of a monostable multivibrator connected to the output of the comparison circuit.
Induction heating cooker as described in section.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9821879A JPS5622080A (en) | 1979-07-31 | 1979-07-31 | Induction heating cooking unit |
| AU60744/80A AU521875B2 (en) | 1979-07-31 | 1980-07-24 | Induction heating |
| GB8024328A GB2055030B (en) | 1979-07-31 | 1980-07-24 | Circuit for detecting a utensil load placed asymmetrically relative to an induction heating coil |
| CA000357287A CA1149883A (en) | 1978-07-31 | 1980-07-30 | Circuit for detecting a utensil load placed asymmetrically relative to an induction heating coil |
| DE3028951A DE3028951C2 (en) | 1979-07-31 | 1980-07-30 | Induction heating cooker |
| US06/173,802 US4447691A (en) | 1979-07-31 | 1980-07-30 | Circuit for detecting a utensil load placed asymmetrically relative to an induction heating coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9821879A JPS5622080A (en) | 1979-07-31 | 1979-07-31 | Induction heating cooking unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5622080A JPS5622080A (en) | 1981-03-02 |
| JPS6132793B2 true JPS6132793B2 (en) | 1986-07-29 |
Family
ID=14213824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9821879A Granted JPS5622080A (en) | 1978-07-31 | 1979-07-31 | Induction heating cooking unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5622080A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014175277A (en) * | 2013-03-13 | 2014-09-22 | Hitachi Appliances Inc | Induction heating cooker |
| DE102014214795A1 (en) * | 2014-07-28 | 2016-01-28 | E.G.O. Elektro-Gerätebau GmbH | Method and device for detecting the position of a pot on an induction hob |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518036B2 (en) * | 1974-10-04 | 1980-05-15 |
-
1979
- 1979-07-31 JP JP9821879A patent/JPS5622080A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5622080A (en) | 1981-03-02 |
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