JP3799523B2

JP3799523B2 - High frequency heating device

Info

Publication number: JP3799523B2
Application number: JP2001171621A
Authority: JP
Inventors: 秀樹渡邊
Original assignee: Mitsubishi Electric Home Appliance Co Ltd; Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Home Appliance Co Ltd; Mitsubishi Electric Corp
Priority date: 2001-06-06
Filing date: 2001-06-06
Publication date: 2006-07-19
Anticipated expiration: 2021-06-06
Also published as: JP2002364858A

Description

【０００１】
【発明の属する技術分野】
この発明は、マイクロコンピュータ等を備えた制御回路の電源を制御する高周波加熱装置に関するものである。
【０００２】
【従来の技術】
図１２は従来の高周波加熱装置の要部縦断面図、図１３はそのドアの開放状態図である。図において１は本体、２は前記本体１に設けた一方に開口部を有する加熱室、３は前記加熱室２の開口部を開閉するドア、このドア３は本体１の下部にアーム４４で連結枢支され、本体１内のコイルバネ（図示せず）により、常時閉方向に付勢されている。４５は前記ドア３の上部外面に設けたハンドル、４６は前記ドア３を介してハンドル４５と対向して設けた突起である。４７は加熱室２の外部壁に固着され上部に突出したストッパー４７ａを有する支持台、４８は回転レバーで、回転軸４９により支持台７に回転自在に枢支されている。
【０００３】
回転レバー４８は、回転軸４９より上方に延設した先端に突出部４８ａを有するレバー（ａ）４８ｂと、下方へ延設したレバー（ｂ）４８ｃと前記レバー（ａ）４８ｂとレバー（ｂ）４８ｃに略垂直方向に延設したレバー（ｃ）４８ｄで構成されている。５０は上面をレバー（ｂ）４８ｃの先端に当接配置したドアスイッチ（ａ）であり、ノブ５０ａを出没自在に備えている。５１は前記回転レバー（ｃ）４８ｄの先端部に当接配置されたラッチスイッチであり、ノブ５１ａを出没自在に備えている。５２は前記回転レバー４８のレバー（ａ）４８ｂを前記ドア３側へ付勢するコイルバネである。
【０００４】
また、図１４は従来の高周波加熱装置のドア閉で電源投入時の回路図であり、図において、１５は商用電源、１６は電流ヒューズ、５５はドア３が開いたときにＯＦＦし、閉じたときＯＮする一対のラッチスイッチ、５６はドアが開いたとき接点ａと接続し、ドアが閉じたときは接点ｂと接続する副ドアスイッチで、
ドア開放時にラッチスイッチ５５の接点が溶着してＯＦＦしなかったとき、電流ヒューズ１６を溶断するためのものである。１７は調理中に加熱室２内を照らすランプ、１８は加熱室２内底部に配設したターンテーブル（図示せず）を回転させるテーブルモータ、１９は高周波発生源２０に直列に接続されたリレー、２１、２２は各加熱ヒータ２３、２４にそれぞれ直列に接続されたリレー、５７は後述する制御回路２９の制御に基づいて商用電源１５の負荷回路をＯＮ／ＯＦＦするリレーである。２６は高周波発生源２０に並列に接続されたファンモータ、５０はドアが開いたときＯＮし、閉じたときＯＦＦするドアスイッチ（ａ）、５８はこのドアスイッチ５０に並列に接続されたリレーで、制御回路２９の制御に基づいて電源回路３１をＯＮ／ＯＦＦする。
【０００５】
２９は制御回路で、マイクロコンピュータ３０と、商用電源１５の交流電圧を安定化した直流電圧に変換する電源回路３１と、外部操作に基づいて調理指令をマイクロコンピュータ３０に出力するキー入力検知回路３２と、ドアの開閉状態を検知するためのドア検知回路３４と、マイクロコンピュータ３０の制御に応じてリレー１９、２１、２２をＯＮ／ＯＦＦする出力回路３５とを備えている。
【０００６】
次に、前記のように構成された従来の高周波加熱装置の動作を図１５、図１６により説明する。図１５はドアスイッチ（ａ）５０及びリレー５８のＯＮ／ＯＦＦ制御に関した高周波加熱装置の動作を示すフローチャート、図１６は動作のタイミングチャートである。
【０００７】
まず、商用電源１５を投入する（ステップＳ１）。このとき、ドア３は閉状態なので（ステップＳ２）、ドアスイッチ（ａ）５０、リレー５８共にＯＦＦ状態である（ステップＳ３）。このドア３を開けると（ステップＳ４）、バネ５２の付勢力により回転レバー４８が軸４９を中心に回転し、レバー（ｃ）４８ｄがラッチスイッチ５１からはずれノブ５１ａが突出し、一対のラッチスイッチ５１がＯＦＦすると同時に、副ドアスイッチ５６が接点ｂから接点ａに切り換わって商用電源１５と負荷側とを完全に切り離す。このとき、レバー（ｂ）４８ｃがドアスイッチ（ａ）５０からずれてノーマルクローズ形のドアスイッチ（ａ）５０がＯＮし（ステップＳ５）、商用電源１５と制御回路２９の電源回路３１とを接続する。この接続により制御回路２９が起動すると、ドア検知回路３４がドアの開放を検知してその情報をマイクロコンピュータ３０に出力し、マイクロコンピュータ３０はその情報が入力されたときリレー５８をＯＮすると共に（ステップＳ６）、マイクロコンピュータ３０内のタイマー３０ａに、一定のタイマ時間ｔ１（例えば１０分間）を設定して（ステップＳ７）待機する。
【０００８】
ここで、食品を加熱室２に入れてドア３を閉じると（ステップＳ８）、ドア３の突起４６がレバー（ａ）４８ｂの突出部４８ａを押し、回転レバー４８は軸４９を中心に回転し戻されると、レバー（ｃ）４８ｄがラッチスイッチ５１のノブ５１ａを押し、一対のラッチスイッチ５１がＯＮし、副ドアスイッチ５６が接点ａから接点ｂに切り換わる。同時に、レバー（ｂ）４８ｃがドアスイッチ（ａ）５０のノブ５０ａを押してドアスイッチ（ａ）５０がＯＦＦする（ステップＳ９）。一方、マイクロコンピュータ３０が、その状態を、ドア検知回路３４を通して検知すると、タイマー３０ａは設定したタイマ時間ｔ１のカウントダウンを開始する（ステップＳ１０）。このまま、タイマ時間ｔ１が経過すると、タイマ時間ｔ１がゼロとなり、出力回路３５を介してリレー５８をＯＦＦし（ステップＳ１１）、商用電源１５と電源回路３１とを切り離して、電源供給を停止する。上記の動作のタイミングチャートを図１６に示す。
【０００９】
タイマ時間ｔ１をカウントダウンする間にキー入力検知回路３２からの調理指令が入力されたときは（ステップＳ１２）、タイマ時間のカウントダウンを停止すると共に、その指令に基づく、例えば、高周波加熱であればリレー１９とリレー５７を、出力回路３５を介してＯＮし、ランプ１７及びテーブルモータ１８に電源を供給するとともに、高周波発生源２０及びファンモータ２６に電源を印加する（ステップＳ１３）。そして調理中ドア３を開けずに（ステップＳ１４）、この高周波発生源２０の加熱調理による調理時間が経過すると、リレー１９とリレー５７をＯＦＦして調理を終了し（ステップＳ１５）、ただちにリレー５８をＯＦＦして、商用電源１５と電源回路３１とを切り離して、電源供給を停止する。また、調理中にドア３を開けたときは（ステップＳ１４）、調理待機状態となる。そして再び、ドア３を閉じると（ステップＳ１７）、調理が再スタート（ステップＳ１８）する。
【００１０】
【発明が解決しようとする課題】
前述した従来の高周波加熱装置では、ドア３を開けている状態においては、リレー５８のＯＮ／ＯＦＦに関係なく、ドアスイッチ（ａ）５０がＯＮして制御回路２９に電源が常時印加されているため、電力が常時消費されてしまい、その間に消費される電力が無駄になる。
【００１１】
この発明は、かかる課題を解決するためになされたもので、簡単な構成により、無駄な消費電力をなくす高周波加熱装置を得ることを目的とする。
【００１２】
【課題を解決するための手段】
この発明に係る高周波加熱装置は、加熱室の扉に連動するスイッチ駆動手段と、このスイッチ駆動手段により動作する第１、第２のスイッチと、前記扉の開閉を検出するドア検出回路を有する制御回路と、加熱室に熱源を供給する負荷回路と、を備え、前記第１のスイッチは双方向接点式であり、前記第１のスイッチの共通端子は前記商用電源に接続され、前記第１のスイッチの常開接点は前記負荷回路に接続され、前記第１のスイッチの常閉接点は前記制御回路に接続され、前記第２のスイッチは双方向接点式であり、前記第２のスイッチの共通端子は前記商用電源に接続され、前記第２のスイッチの常開接点は前記制御回路に接続され、前記第２のスイッチの常閉接点は前記第１のスイッチの常開接点に接続されるとともに、前記負荷回路に接続され、前記ドア検出回路は前記第１のスイッチの常開接点に並列に接続し、それぞれ前記第１のスイッチの前記共通端子と前記常閉接点、第２のスイッチの前記共通端子と前記常開接点に、並列に接続され、前記商用電源と前記制御回路をＯＮ，ＯＦＦする第１，第２のリレーとを、更に備え、前記扉が全閉のときに、前記スイッチ駆動手段により、前記第１のスイッチの常閉接点がＯＦＦ、前記第２のスイッチの常開接点がＯＮとなるとともに、前記第１、第２のリレーがＯＦＦとなり、
前記扉が半開のときに、前記スイッチ駆動手段により、前記第１のスイッチの常閉接点がＯＮ、前記第２のスイッチの常開接点がＯＮとなり、前記商用電源と前記制御回路が接続され、前記制御回路が起動し、前記制御回路は、前記ドア検出回路によりドアの開放を検出したときに前記第１、第２のリレーをＯＮするとともに、あらかじめ定められた時間を設定し、前記扉が全開のときに、前記スイッチ駆動手段により、前記第１のスイッチの常閉接点がＯＮ、前記第２のスイッチの常開接点がＯＦＦとなり、前記制御回路は、前記あらかじめ定められた時間が経過したとき、第１、第２のリレーをＯＦＦさせ、前記商用電源と前記制御回路を遮断させるものである。
【００１３】
また、スイッチ駆動手段は、扉に設けられた第１、第２のラッチと、加熱室側に設けられ、ドアの開閉により前記第１、第２のラッチを連動させるガイド部と、加熱室側に回転自在に設けられ、前記第１、第２のラッチの動作に各々連動して第１、第２のスイッチのノブを出没させる第１、第２の回転レバーとを備える。
【００１４】
【発明の実施の形態】
図１はこの発明の実施形態１を示す高周波加熱装置の斜視図、図２、図４、図６、図８は、ドア開閉の動作説明のための要部断面図、図３、図５、図７、図９は、図２、図４、図６、図８のそれぞれの動作回路図、図１０は動作のフローチャート、図１１は動作のタイミングチャートである。
【００１５】
図１において１は本体、２は本体１に設けた一方に開口部を有する加熱室、３は記加熱室２の開口部を、その左端を軸として開閉するドアである。４はドア３の外面側に設けられ、使用者が前記ドア３を開閉するために用いるハンドル、６はドア３を介してハンドル４と対向して設けられた一対のラッチ６ａ、６ｂからなるラッチであり、ドア３内でコイルバネ５により連結枢支され、常時下部方向に付勢されている。また、このラッチ６は、ドア３が閉じられている時には加熱室２外の本体１内に嵌め込まれ、本体１内のラツチ６が嵌め込まれている部分には、後述の各種スイッチが設けられている。
【００１６】
図２、図４、図６、図８において７は前記加熱室２の外部壁に固着された支持台、８は回転レバーで、回転軸９により支持台７に回転自在に枢支されている。１０は上面を前記レバー８の先端に当接配置し、第２のスイッチであるノーマルオープン型のラッチスイッチであり、ノブ１０ａを出没自在に備えている。１１は回転レバーで、側面側の凸部１１ａと先端部１１ｂを有し、回転軸１２により支持台７に回転自在に枢支されている。１３は前記回転レバー１１の先端部に当接配置された、ノーマルオープン型のドアスイッチであり、ノブ１３ａを出没自在に備えている。１４は回転レバ−１１の先端部１１ｂに当接配置された、第１のスイッチであるノーマルクローズ型のモニタスイッチであり、ノブ１４ａを出没自在に備えている。また、支持台７にはドア３の開閉により、ラッチ６ａ、６ｂをコイルバネ５に抗して上下に移動させるガイド部７ａ、７ｂが設けられている。なお、スイッチ駆動手段は、上述のラッチ６ａ、６ｂと、支持台に設けられたガイド部７ａ、７ｂ及びラッチ６及び回転レバー８、１１とを備えたものである。
【００１７】
また、図３、図５、図７、図９において、１５は商用電源、１６は電流ヒューズで、ラッチスイッチ１０はドア３が閉じられている時に常開接点（Ｎ．Ｏ）がＯＮし、開いたときに常閉接点（Ｎ．Ｃ）がＯＮするスイッチである。ドアスイッチ１３はドア３が閉じられている時に常開接点（Ｎ．Ｏ）がＯＮするスイッチである。１４はドア３が閉じられている時に常開接点がＯＮし、ドアが開いたときに常閉接点（Ｎ．Ｃ）がＯＮするモニタスイッチで、ドア開放時にラッチスイッチ１０の常開接点が溶着してＯＦＦしなかったとき、電流ヒューズ１６を溶断するためのものである。
【００１８】
６０は負荷回路であり、調理中に加熱室２内を照らすランプ１７、加熱室２内底部に配設したターンテーブル（図示せず）を回転させるテーブルモータ１８、高周波発生源２０に直列に接続されたリレー１９、各加熱ヒータ２３，２４にそれぞれ直列に接続されたリレー２１、２２及び高周波発生源２０に並列に接続されたファンモータ２６とを備えている。
【００１９】
２５は後述する制御回路の制御に基づいて商用電源１５の負荷回路をＯＮ／ＯＦＦするリレーである。２７はラッチスイッチ１０の常閉接点（Ｎ．Ｃ）に並列に接続されたリレーで、制御回路２９の制御に基づいて電源回路３１の一方をＯＮ／ＯＦＦする。また、２８はモニタスイッチ１３の常開接点（Ｎ．Ｏ）に並列に接続きれたリレーで、制御回路２９の制御に基づいて電源回路３１の他方をＯＮ／ＯＦＦする。
【００２０】
２９は制御回路で、マイクロコンピュータ３０と、商用電源１３の交流電圧を安定化した直流電圧に変換する電源回路３１と、外部操作に基づいて調理指令をマイクロコンピュータ３０に出力するキー入力検知回路３２と、ドアの開閉状態を検知するためのドア開閉検知回路３４と、マイクロコンピュータ３０の制御に応じてリレー１９、２１、２２、２５、２７、２８をＯＮ／ＯＦＦする出力回路３５とを備えている。
【００２１】
ドア開閉検知回路３４は、図示してないが商用電源１５にラッチスイッチ１０の常開接点（Ｎ．Ｏ）を介して並列に接続され、ドア３が全閉し、ラッチスイッチ１０の常開接点（Ｎ．Ｏ）がＯＮすると、所定の電圧を出力してマイクロコンピュータ３０に印加されることによりドア３の全閉が検知される。そして、ドア３が開放され、ラッチスイッチ１０の常開接点（Ｎ．Ｏ）がＯＦＦすると、電圧が０となりマイクロコンピュータ３０によりドア３の開放が検知される。
【００２２】
次に、以上のように構成された実施の形態１の高周波加熱装置の動作を図１０、図１１により説明する。図１０はラッチスイッチ１０、モニタスイッチ１３及びリレー２７，２８のＯＮ／ＯＦＦ制御に関した高周波加熱装置の動作を示すフローチヤー卜、図１１は動作のタイミングチャートである。
【００２３】
まず、商用電源１５を投入する（ステップＳ２１）。このとき、図２に示すように、ドア３は閉状態なので（ステップＳ２２）、ラッチスイッチ１０、モニタスイッチ１４の後述するノブ１０ａ、１４ａは、各々回転レバー８、回転レバー１１により押し込まれたままなので、図３に示すように、ラッチスイッチ１０、モニタスイッチ１４共にＯＮ状態（常開接点（Ｎ．Ｏ）ＯＮ、常閉接点（Ｎ．Ｃ）ＯＦＦ）、リレー２７，２８共に０ＦＦ状態であり（ステップＳ２３）、制御回路２９の電源回路３１は商用電源１５と切り離されている。また、このとき、ドア検知回路３４はラッチスイッチ１０がＯＮ状態（常開接点（Ｎ．Ｏ）（ＯＮ））となるので、ラッチスイッチ１０の常開接点（Ｎ．Ｏ）がＯＮすると所定の電圧を出力してマイクロコンピュータ３０に印加されることによりドア３の全閉が検知される。なお、ドアスイッチ１３も同様にＯＮ状態である。
【００２４】
次に、閉状態のドア３を図４に示すように少しすこし開ける（隙間ｂ半開放状態）と（ステップＳ２４）、回転レバー８が軸９を中心に回転し、レバー８がラッチスイッチ１０から離れ、ノブ１０ａが突出して、図５に示すようにラツチスイッチ１０の常開接点（Ｎ．Ｏ）（ＮＯ）がＯＦＦし、商用電源１５と負荷側とを完全に切り離す。この時、ラッチスイッチ１０の常開接点（Ｎ．Ｏ）がＯＦＦすると共に、常閉接点（Ｎ．Ｃ）がＯＮし（ステップＳ２５）、商用電源１５と制御回路２９の電源回路３１とを接続する。この接続により、制御回路２９が起動すると、ラッチスイッチ１０がＯＦＦ状態（常開接点（Ｎ．Ｏ）（ＯＦＦ））となると、所定の出力電圧が０となりマイクロコンピュータ３０によりドア３の開放が検知される。そして、マイクロコンピュータ３０はこの情報が入力されると、リレー２７、２８をＯＮすると共に（ステップＳ２６）、タイマー３０ａにタイマ時間ｔ２（例えば５分間）を設定してカウントダウンを開始する（ステップＳ２７）。
【００２５】
次に、さらに半開状態のドア３を図６に示すように、さらに開ける（隙間ｃ及びｄ開放状態）と（ステップＳ２８）、回転レバー１１が軸１２を中心に回転し、レバー１１の先端部１１ａがドアスイッチ１３から離れ、ノブ１３ａが突出し、図７に示すように、ドアスイッチ１３がＯＦＦする。このため、商用電源１５と負荷側が完全に切り離される。
【００２６】
次に、図８に示すように、ドア３を間隙ｄ以上から全開にすると（ステップＳ２８）、回転レバー１１がさらに回転し、レバー１１の先端部１１ｂがモニタスイッチ１４から離れ、ノブ１４ａが突出し、図９に示すように、モニタスイッチ１４の常開接点（Ｎ．Ｏ）（ＮＯ）がＯＦＦすると共に、常閉接点（Ｎ．Ｃ）（ＣＮ）がＯＮし（ステップＳ２９）、商用電源１５と制御回路２９の電源回路３１との接続を切り離す。そして、タイマ時間ｔ２がゼロになったとき（ステップＳ３０）、出力回路３５によりリレー２７、２８をＯＦＦし（ステップＳ３１）、商用電源１５と電源回路３１とを切り離して電源供給を停止する。
なお、ドアスイッチ１３のノブ１３ａは突出したままとなっており、ドアスイッチ１３はＯＦＦとなっており、商用電源１５と負荷側が完全に切り離されている。また、ここでは、ドア３の間隙をａ〜ｄに分けて説明したが、通常の使用状態ではラッチ６はバネ５で下側へ付勢されているため、ｂ〜ｄの位置で固定されることはなく、その間の動作時間は、タイマ時間ｔ２に比べ、十分短いことは明らかである。
【００２７】
次に、ドア３が開放状態にあるとき、食品を加熱庫２に入れてドア３を図４に示すように半開状態にすると（ステップＳ３２）、ドアスイッチ１３、モニタスイッチ１４のノブ１３ａ、１４ａは、各々回転レバー８、回転レバー１１により押し込まれるが、ラッチスイッチ１０のノブ１０ａは突き出したままであり、図５に示すようにラツチスイッチ１０の常開接点（Ｎ．Ｏ）（ＮＯ）がＯＦＦし、商用電源１５と負荷側とは切り離されたままである。このとき、ラッチスイッチ１０常閉がＯＮするので（ステップＳ３３）、商用電源１５と制御回路２９の電源回路３１とが接続され、制御回路２９が起動すると、ドア検知回路３４がドア３の開放を検知して、その情報をマイクロコンピュータ３０に出力し、マイクロコンピュータ３０はその情報が入力されると、リレー２７、２８をＯＮすると共に（ステップＳ３４）、タイマー３０ａにタイマ時間ｔ３（例えば５分間）を設定して待機する（ステップＳ３５）。なお、ドアスイッチ１３はＯＮ状態である。
【００２８】
次に、ドア３を閉にすると（ステップＳ３６）、図２のように回転レバー８が戻され、レバー８によりラッチスイッチ１０のノブ１０ａが押し込まれ、図３に示すように、ラッチスイッチ１０、モニタスイッチ１４共にＯＮ状態（常開接点（Ｎ．Ｏ）ＯＮ、常閉接点（Ｎ．Ｃ）ＯＦＦ）となる（ステップＳ３７）。ここで、タイマー３０ａにタイマ時間ｔ３が設定されているので、出力回路３５によりリレー２７、２８はＯＦＦとならずＯＮのままであり、制御回路２９の電源回路３１は商用電源１５と接続されている。
【００２９】
一方、マイクロコンピュータ３０は、ドア３の閉状態を、ドアスイッチ検出回路３４を通して検知すると、タイマー３０ａは先に設定したタイマ時間ｔ３カウントダウンを開始し、このまま、先に設定したタイマ時間ｔ３が経過すると（ステップＳ３８）、タイマ時間ｔ３がゼロとなり、出力回路３５によりリレー２７、２８をＯＦＦし（ステップＳ３１）、商用電源１５と電源回路３１とを切り離して、電源供給を停止する。
【００３０】
図１０に示していないが、タイマ時間ｔ３をカウントダウンの間にキー入力検知回路３２からの調理指令が入力されたときは、タイマ時間ｔ３のカウントダウンを停止すると共に、その指令に基づく、例えば、高周波加熱であればリレー１９とリレー２５を、出力回路３５によりＯＮし、ランプ１７及びテーブルモータ１８に電源を供給するとともに、高周波発生源２０及びファンモータ２６に電源を印加する。そして調理中にドア３を開けずに、この高周波発生源２０の加熱調理による調理時間が経過すると、リレー１９とリレー２５をＯＦＦして調理を終了し、リレー２７、２８をＯＦＦして、商用電源１５と電源回路３１とを切り離して、電源供給を停止する。
【００３１】
【発明の効果】
以上のようにこの発明によれば、加熱室の扉に連動するスイッチ駆動手段と、このスイッチ駆動手段により動作する第１、第２のスイッチと、前記扉の開閉を検出するドア検出回路を有する制御回路と、加熱室に熱源を供給する負荷回路と、を備え、前記第１のスイッチは双方向接点式であり、前記第１のスイッチの共通端子は前記商用電源に接続され、前記第１のスイッチの常開接点は前記負荷回路に接続され、前記第１のスイッチの常閉接点は前記制御回路に接続され、前記第２のスイッチは双方向接点式であり、前記第２のスイッチの共通端子は前記商用電源に接続され、前記第２のスイッチの常開接点は前記制御回路に接続され、前記第２のスイッチの常閉接点は前記第１のスイッチの常開接点に接続されるとともに、前記負荷回路に接続され、前記ドア検出回路は前記第１のスイッチの常開接点に並列に接続し、それぞれ前記第１のスイッチの前記共通端子と前記常閉接点、第２のスイッチの前記共通端子と前記常開接点に、並列に接続され、前記商用電源と前記制御回路をＯＮ，ＯＦＦする第１，第２のリレーとを、更に備え、前記扉が全閉のときに、前記スイッチ駆動手段により、前記第１のスイッチの常閉接点がＯＦＦ、前記第２のスイッチの常開接点がＯＮとなるとともに、前記第１、第２のリレーがＯＦＦとなり、
前記扉が半開のときに、前記スイッチ駆動手段により、前記第１のスイッチの常閉接点がＯＮ、前記第２のスイッチの常開接点がＯＮとなり、前記商用電源と前記制御回路が接続され、前記制御回路が起動し、前記制御回路は、前記ドア検出回路によりドアの開放を検出したときに前記第１、第２のリレーをＯＮするとともに、あらかじめ定められた時間を設定し、前記扉が全開のときに、前記スイッチ駆動手段により、前記第１のスイッチの常閉接点がＯＮ、前記第２のスイッチの常開接点がＯＦＦとなり、前記制御回路は、前記あらかじめ定められた時間が経過したとき、第１、第２のリレーをＯＦＦさせ、前記商用電源と前記制御回路を遮断させるので、ドアの開放時に消費される制御回路の電力を軽減することができる。
【００３２】
また、スイッチ駆動手段は、扉に設けられた第１、第２のラッチと、加熱室側に設けられ、ドアの開閉により前記第１、第２のラッチを連動させるガイド部と、加熱室側に回転自在に設けられ、前記第１、第２のラッチの動作に各々連動して第１、第２のスイッチのノブを出没させる第１、第２の回転レバーとを備えたので、簡単な構成により扉の開閉に応じた制御をする事ができる。
【図面の簡単な説明】
【図１】この発明の実施形態を示す高周波加熱装置の斜視図である。
【図２】この発明の実施形態を示す高周波加熱装置の動作説明図である。
【図３】この発明の実施形態を示す高周波加熱装置の動作回路図である。
【図４】この発明の実施形態を示す高周波加熱装置の動作説明図である。
【図５】この発明の実施形態を示す高周波加熱装置の動作回路図である。
【図６】この発明の実施形態を示す高周波加熱装置の動作説明図である。
【図７】この発明の実施形態を示す高周波加熱装置の動作回路図である。
【図８】この発明の実施形態を示す高周波加熱装置の動作説明図である。
【図９】この発明の実施形態を示す高周波加熱装置の動作回路図である。
【図１０】この発明の実施形態を示す高周波加熱装置の動作のフローチャートである。
【図１１】この発明の実施形態を示す高周波加熱装置の動作のタイミングチヤートである。
【図１２】従来の高周波加熱装置の要部縦断面図である。
【図１３】従来の高周波加熱装置の動作説明図である。
【図１４】従来の高周波加熱装置の動作回路図である。
【図１５】従来の高周波加熱装置の動作のフローチャートである。
【図１６】従来の高周波加熱装置の動作のタイミングチヤートである。
【符号の説明】
１本体、２加熱室、３ドア、５ハンドル、６ラッチ、８、１１回転レバー、１０ラッチスイッチ、１３ドアスイッチ、１４モニタスイッチ、１５商用電源、２７、２８リレー、２９制御回路、３０マイクロコンピュータ、３１電源回路、３４ドア検知回路、３５出力回路、６０負荷回路。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency heating device that controls a power source of a control circuit including a microcomputer.
[0002]
[Prior art]
FIG. 12 is a longitudinal sectional view of a main part of a conventional high-frequency heating device, and FIG. 13 is an open state diagram of the door. In the figure, 1 is a main body, 2 is a heating chamber provided in the main body 1 and having an opening on one side, 3 is a door for opening and closing the opening of the heating chamber 2, and the door 3 is connected to the lower part of the main body 1 by an arm 44 It is pivotally supported and is normally urged in the closing direction by a coil spring (not shown) in the main body 1. Reference numeral 45 denotes a handle provided on the upper outer surface of the door 3, and 46 denotes a protrusion provided to face the handle 45 through the door 3. Reference numeral 47 is a support base having a stopper 47 a fixed to the outer wall of the heating chamber 2 and protruding upward, and 48 is a rotation lever, which is pivotally supported on the support base 7 by a rotary shaft 49.
[0003]
The rotating lever 48 includes a lever (a) 48b having a protruding portion 48a at the tip extending upward from the rotating shaft 49, a lever (b) 48c extending downward, the lever (a) 48b and the lever (b). It is composed of a lever (c) 48d extending substantially vertically to 48c. Reference numeral 50 denotes a door switch (a) having an upper surface in contact with the tip of the lever (b) 48c, and is provided with a knob 50a that can be moved in and out. A latch switch 51 is disposed in contact with the tip of the rotary lever (c) 48d, and includes a knob 51a that can be moved in and out. A coil spring 52 biases the lever (a) 48b of the rotating lever 48 toward the door 3 side.
[0004]
FIG. 14 is a circuit diagram of the conventional high-frequency heating device when the door is closed and the power is turned on. In the figure, 15 is a commercial power source, 16 is a current fuse, 55 is OFF and closed when the door 3 is opened. A pair of latch switches 56, which are turned on, are connected to the contact a when the door is opened, and a sub-door switch which is connected to the contact b when the door is closed.
When the contact of the latch switch 55 is welded and does not turn OFF when the door is opened, the current fuse 16 is blown. 17 is a lamp that illuminates the inside of the heating chamber 2 during cooking, 18 is a table motor that rotates a turntable (not shown) disposed in the bottom of the heating chamber 2, and 19 is a relay connected in series to the high-frequency generator 20. , 21 and 22 are relays connected in series to the heaters 23 and 24, respectively, and 57 is a relay for turning on / off the load circuit of the commercial power supply 15 based on the control of the control circuit 29 described later. 26 is a fan motor connected in parallel to the high frequency source 20, 50 is a door switch (a) that is turned on when the door is opened and turned off when the door is closed, and 58 is a relay connected in parallel to the door switch 50. Then, the power supply circuit 31 is turned on / off based on the control of the control circuit 29.
[0005]
A control circuit 29 includes a microcomputer 30, a power supply circuit 31 that converts the AC voltage of the commercial power supply 15 into a stabilized DC voltage, and a key input detection circuit 32 that outputs a cooking command to the microcomputer 30 based on an external operation. And a door detection circuit 34 for detecting the open / closed state of the door, and an output circuit 35 for turning on / off the relays 19, 21, 22 in accordance with the control of the microcomputer 30.
[0006]
Next, the operation of the conventional high-frequency heating apparatus configured as described above will be described with reference to FIGS. FIG. 15 is a flowchart showing the operation of the high-frequency heating device related to ON / OFF control of the door switch (a) 50 and the relay 58, and FIG. 16 is a timing chart of the operation.
[0007]
First, the commercial power supply 15 is turned on (step S1). At this time, since the door 3 is in the closed state (step S2), both the door switch (a) 50 and the relay 58 are in the OFF state (step S3). When the door 3 is opened (step S4), the rotating lever 48 is rotated about the shaft 49 by the biasing force of the spring 52, the lever (c) 48d is disengaged from the latch switch 51, and the knob 51a protrudes. At the same time, the sub door switch 56 is switched from the contact point b to the contact point a to completely disconnect the commercial power supply 15 from the load side. At this time, the lever (b) 48c is displaced from the door switch (a) 50 and the normally closed door switch (a) 50 is turned ON (step S5), and the commercial power supply 15 and the power supply circuit 31 of the control circuit 29 are connected. To do. When the control circuit 29 is activated by this connection, the door detection circuit 34 detects the opening of the door and outputs the information to the microcomputer 30. When the information is input, the microcomputer 30 turns on the relay 58 ( In step S6), a fixed timer time t1 (for example, 10 minutes) is set in the timer 30a in the microcomputer 30 (step S7), and the process waits.
[0008]
Here, when food is put into the heating chamber 2 and the door 3 is closed (step S8), the protrusion 46 of the door 3 pushes the protrusion 48a of the lever (a) 48b, and the rotation lever 48 rotates about the shaft 49. When the lever is returned, the lever (c) 48d pushes the knob 51a of the latch switch 51, the pair of latch switches 51 is turned on, and the sub door switch 56 is switched from the contact a to the contact b. At the same time, the lever (b) 48c pushes the knob 50a of the door switch (a) 50, and the door switch (a) 50 is turned OFF (step S9). On the other hand, when the microcomputer 30 detects the state through the door detection circuit 34, the timer 30a starts to count down the set timer time t1 (step S10). If the timer time t1 elapses, the timer time t1 becomes zero, the relay 58 is turned off via the output circuit 35 (step S11), the commercial power supply 15 and the power supply circuit 31 are disconnected, and the power supply is stopped. A timing chart of the above operation is shown in FIG.
[0009]
When a cooking command is input from the key input detection circuit 32 while the timer time t1 is being counted down (step S12), the timer time countdown is stopped, and based on the command, for example, a relay for high-frequency heating. 19 and the relay 57 are turned on via the output circuit 35 to supply power to the lamp 17 and the table motor 18 and to apply power to the high-frequency generation source 20 and the fan motor 26 (step S13). Then, without opening the door 3 during cooking (step S14), when the cooking time by heating cooking of the high-frequency generation source 20 has elapsed, the relay 19 and the relay 57 are turned off to finish cooking (step S15), and immediately the relay 58 Is turned off, the commercial power supply 15 and the power supply circuit 31 are disconnected, and the power supply is stopped. When the door 3 is opened during cooking (step S14), the cooking standby state is set. When the door 3 is closed again (step S17), cooking is restarted (step S18).
[0010]
[Problems to be solved by the invention]
In the conventional high-frequency heating device described above, when the door 3 is opened, the door switch (a) 50 is turned on and power is constantly applied to the control circuit 29 regardless of whether the relay 58 is turned on or off. Therefore, power is always consumed, and power consumed during that time is wasted.
[0011]
The present invention has been made to solve such a problem, and an object of the present invention is to provide a high-frequency heating device that eliminates wasteful power consumption with a simple configuration.
[0012]
[Means for Solving the Problems]
A high-frequency heating device according to the present invention is a control having switch driving means interlocked with a door of a heating chamber, first and second switches operated by the switch driving means, and a door detection circuit for detecting opening and closing of the door. A load circuit for supplying a heat source to the heating chamber, wherein the first switch is a bidirectional contact type, a common terminal of the first switch is connected to the commercial power source, and the first switch The normally open contact of the switch is connected to the load circuit, the normally closed contact of the first switch is connected to the control circuit, the second switch is a bidirectional contact type, and is common to the second switch The terminal is connected to the commercial power source, the normally open contact of the second switch is connected to the control circuit, the normally closed contact of the second switch is connected to the normally open contact of the first switch, and The load times Connected to said door detection circuit is connected in parallel to the normally open contact of the first switch, The first terminal is connected in parallel to the common terminal and the normally closed contact of the first switch, the common terminal and the normally open contact of the second switch, and turns on and off the commercial power supply and the control circuit. , A second relay, and When the door is fully closed, the switch driving means turns off the normally closed contact of the first switch and turns on the normally open contact of the second switch, and the first and second relays. Becomes OFF,
When the door is half open, the normally closed contact of the first switch is ON, the normally open contact of the second switch is ON by the switch driving means, and the commercial power supply and the control circuit are connected, The control circuit is activated, and when the door detection circuit detects the opening of the door, the control circuit turns on the first and second relays and sets a predetermined time. When fully open, the switch drive means turns on the normally closed contact of the first switch, turns off the normally opened contact of the second switch, and the control circuit has passed the predetermined time. At this time, the first and second relays are turned OFF to cut off the commercial power supply and the control circuit.
[0013]
Further, the switch driving means includes first and second latches provided on the door, a guide portion provided on the heating chamber side, and interlocking the first and second latches by opening and closing the door, and the heating chamber side. The first and second rotary levers are provided so as to be rotatable and project and retract the knobs of the first and second switches in conjunction with the operations of the first and second latches, respectively.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1 is a perspective view of a high-frequency heating device showing Embodiment 1 of the present invention, FIGS. 2, 4, 6, and 8 are cross-sectional views of main parts for explaining door opening / closing operations, FIG. 3, FIG. FIGS. 7 and 9 are operation circuit diagrams of FIGS. 2, 4, 6, and 8, FIG. 10 is a flowchart of the operation, and FIG. 11 is a timing chart of the operation.
[0015]
In FIG. 1, 1 is a main body, 2 is a heating chamber provided in the main body 1 and having an opening on one side, and 3 is a door that opens and closes the opening of the heating chamber 2 with its left end as an axis. A handle 4 is provided on the outer surface side of the door 3 and is used by a user to open and close the door 3. A latch 6 is formed of a pair of latches 6 a and 6 b provided facing the handle 4 through the door 3. In the door 3, it is connected and pivotally supported by a coil spring 5 and is always urged downward. The latch 6 is fitted in the main body 1 outside the heating chamber 2 when the door 3 is closed, and various switches described later are provided in the portion where the latch 6 in the main body 1 is fitted. Yes.
[0016]
2, 4, 6, and 8, reference numeral 7 denotes a support base fixed to the outer wall of the heating chamber 2, and reference numeral 8 denotes a rotary lever that is rotatably supported by the support base 7 by a rotary shaft 9. . Reference numeral 10 denotes a normally open type latch switch as a second switch, the upper surface of which is in contact with the tip of the lever 8, and is provided with a knob 10a that can be moved in and out. Reference numeral 11 denotes a rotary lever, which has a convex portion 11a and a tip end portion 11b on the side surface side, and is pivotally supported on the support base 7 by a rotary shaft 12. Reference numeral 13 denotes a normally open type door switch disposed in contact with the distal end portion of the rotary lever 11, and is provided with a knob 13a so as to be able to appear and retract. Reference numeral 14 denotes a normally closed type monitor switch which is a first switch disposed in contact with the distal end portion 11b of the rotating lever-11, and includes a knob 14a which can be moved in and out. In addition, the support 7 is provided with guide portions 7 a and 7 b that move the latches 6 a and 6 b up and down against the coil spring 5 by opening and closing the door 3. The switch driving means includes the above-described latches 6a and 6b, guide portions 7a and 7b provided on the support base, the latch 6, and the rotation levers 8 and 11.
[0017]
3, 5, 7, and 9, 15 is a commercial power supply, 16 is a current fuse, and the latch switch 10 has a normally open contact (NO) turned on when the door 3 is closed, This is a switch that turns on the normally closed contact (NC) when it is opened. The door switch 13 is a switch for turning on the normally open contact (NO) when the door 3 is closed. 14 is a monitor switch in which the normally open contact is turned on when the door 3 is closed, and the normally closed contact (NC) is turned on when the door is opened. The normally open contact of the latch switch 10 is welded when the door is opened. If the current fuse 16 is not turned off, the current fuse 16 is blown.
[0018]
A load circuit 60 is connected in series to a lamp 17 that illuminates the inside of the heating chamber 2 during cooking, a table motor 18 that rotates a turntable (not shown) disposed at the bottom of the heating chamber 2, and a high-frequency generation source 20. The relay 19, the relays 21 and 22 connected in series to the heaters 23 and 24, and the fan motor 26 connected in parallel to the high-frequency generation source 20, respectively.
[0019]
Reference numeral 25 denotes a relay for turning on / off a load circuit of the commercial power supply 15 based on control of a control circuit described later. A relay 27 is connected in parallel to the normally closed contact (NC) of the latch switch 10 and turns on / off one of the power supply circuits 31 based on the control of the control circuit 29. A relay 28 is connected in parallel to the normally open contact (NO) of the monitor switch 13 and turns on / off the other power supply circuit 31 based on the control of the control circuit 29.
[0020]
A control circuit 29 includes a microcomputer 30, a power supply circuit 31 that converts the AC voltage of the commercial power supply 13 into a stabilized DC voltage, and a key input detection circuit 32 that outputs a cooking command to the microcomputer 30 based on an external operation. A door open / close detection circuit 34 for detecting the open / closed state of the door, and an output circuit 35 for turning on / off the relays 19, 21, 22, 25, 27, 28 according to the control of the microcomputer 30. Yes.
[0021]
Although not shown, the door open / close detection circuit 34 is connected in parallel to the commercial power supply 15 via a normally open contact (NO) of the latch switch 10, the door 3 is fully closed, and the normally open contact of the latch switch 10. When (N.O) is turned ON, a predetermined voltage is output and applied to the microcomputer 30 to detect whether the door 3 is fully closed. When the door 3 is opened and the normally open contact (NO) of the latch switch 10 is turned OFF, the voltage becomes 0 and the microcomputer 30 detects the opening of the door 3.
[0022]
Next, the operation of the high-frequency heating device according to Embodiment 1 configured as described above will be described with reference to FIGS. FIG. 10 is a flow chart showing the operation of the high-frequency heating device related to ON / OFF control of the latch switch 10, the monitor switch 13, and the relays 27 and 28, and FIG. 11 is a timing chart of the operation.
[0023]
First, the commercial power supply 15 is turned on (step S21). At this time, as shown in FIG. 2, since the door 3 is in the closed state (step S22), the knobs 10a and 14a, which will be described later, of the latch switch 10 and the monitor switch 14 remain pressed by the rotary lever 8 and the rotary lever 11, respectively. Therefore, as shown in FIG. 3, both the latch switch 10 and the monitor switch 14 are in the ON state (normally open contact (NO) ON, normally closed contact (NC) OFF), and both the relays 27 and 28 are in the 0FF state. (Step S23), the power supply circuit 31 of the control circuit 29 is disconnected from the commercial power supply 15. At this time, since the latch switch 10 is in an ON state (normally open contact (NO) (ON)), the door detection circuit 34 has a predetermined value when the normally open contact (NO) of the latch switch 10 is ON. When the voltage is output and applied to the microcomputer 30, the door 3 is fully closed. The door switch 13 is also in the ON state.
[0024]
Next, when the door 3 in the closed state is slightly opened as shown in FIG. 4 (gap b half-opened state) (step S24), the rotating lever 8 rotates about the shaft 9, and the lever 8 is moved from the latch switch 10. The knob 10a protrudes, and the normally open contact (NO) (NO) of the latch switch 10 is turned OFF as shown in FIG. 5, and the commercial power supply 15 and the load side are completely disconnected. At this time, the normally open contact (NO) of the latch switch 10 is turned OFF and the normally closed contact (NC) is turned ON (step S25), and the commercial power supply 15 and the power supply circuit 31 of the control circuit 29 are connected. To do. With this connection, when the control circuit 29 is activated, when the latch switch 10 is turned off (normally open contact (NO) (OFF)), the predetermined output voltage becomes 0 and the microcomputer 30 detects the opening of the door 3. Is done. When this information is input, the microcomputer 30 turns on the relays 27 and 28 (step S26), sets a timer time t2 (for example, 5 minutes) in the timer 30a, and starts counting down (step S27). .
[0025]
Next, as shown in FIG. 6, when the door 3 is further opened (gap c and d open) (step S28), the rotating lever 11 rotates about the shaft 12, and the tip of the lever 11 is moved. 11a separates from the door switch 13, the knob 13a protrudes, and the door switch 13 is turned off as shown in FIG. For this reason, the commercial power supply 15 and the load side are completely disconnected.
[0026]
Next, as shown in FIG. 8, when the door 3 is fully opened from the gap d or more (step S28), the rotating lever 11 further rotates, the tip 11b of the lever 11 is separated from the monitor switch 14, and the knob 14a protrudes. As shown in FIG. 9, the normally open contact (NO) (NO) of the monitor switch 14 is turned OFF, the normally closed contact (NC) (CN) is turned ON (step S29), and the commercial power supply 15 And the power supply circuit 31 of the control circuit 29 are disconnected. When the timer time t2 becomes zero (step S30), the relays 27 and 28 are turned off by the output circuit 35 (step S31), the commercial power supply 15 and the power supply circuit 31 are disconnected, and the power supply is stopped.
The knob 13a of the door switch 13 remains protruding, the door switch 13 is OFF, and the commercial power supply 15 and the load side are completely disconnected. In addition, here, the gap of the door 3 is divided into a to d. However, in a normal use state, the latch 6 is biased downward by the spring 5 and is fixed at the positions b to d. It is clear that the operation time during that time is sufficiently shorter than the timer time t2.
[0027]
Next, when the door 3 is in the open state, food is put into the heating chamber 2 and the door 3 is in a half-open state as shown in FIG. 4 (step S32), and the knobs 13a and 14a of the door switch 13 and the monitor switch 14 are placed. Are pushed by the rotary lever 8 and the rotary lever 11, respectively, but the knob 10a of the latch switch 10 remains protruding, and the normally open contact (NO) (NO) of the latch switch 10 is OFF as shown in FIG. However, the commercial power supply 15 and the load side remain disconnected. At this time, since the latch switch 10 is normally closed (step S33), the commercial power supply 15 and the power supply circuit 31 of the control circuit 29 are connected, and when the control circuit 29 is activated, the door detection circuit 34 opens the door 3. The microcomputer 30 detects and outputs the information to the microcomputer 30. When the microcomputer 30 receives the information, the relays 27 and 28 are turned on (step S34), and the timer 30a has a timer time t3 (for example, 5 minutes). Is set to wait (step S35). The door switch 13 is in an ON state.
[0028]
Next, when the door 3 is closed (step S36), the rotary lever 8 is returned as shown in FIG. 2, and the knob 10a of the latch switch 10 is pushed by the lever 8, and as shown in FIG. Both the monitor switches 14 are in the ON state (normally open contact (NO) ON, normally closed contact (NC) OFF) (step S37). Here, since the timer time t3 is set in the timer 30a, the relays 27 and 28 are not turned off by the output circuit 35 but remain on, and the power supply circuit 31 of the control circuit 29 is connected to the commercial power supply 15. Yes.
[0029]
On the other hand, when the microcomputer 30 detects the closed state of the door 3 through the door switch detection circuit 34, the timer 30a starts counting down the previously set timer time t3, and if the previously set timer time t3 elapses. (Step S38), the timer time t3 becomes zero, the relays 27 and 28 are turned off by the output circuit 35 (Step S31), the commercial power supply 15 and the power supply circuit 31 are disconnected, and the power supply is stopped.
[0030]
Although not shown in FIG. 10, when a cooking command is input from the key input detection circuit 32 while the timer time t3 is counted down, the countdown of the timer time t3 is stopped and, for example, a high frequency signal is generated based on the command. In the case of heating, the relay 19 and the relay 25 are turned on by the output circuit 35 to supply power to the lamp 17 and the table motor 18 and to apply power to the high-frequency generation source 20 and the fan motor 26. And if cooking time by heating cooking of this high frequency generation source 20 passes without opening door 3 during cooking, relay 19 and relay 25 are turned off, cooking is ended, relays 27 and 28 are turned off, and commercial use is carried out. The power supply 15 is disconnected from the power supply circuit 31, and the power supply is stopped.
[0031]
【The invention's effect】
As described above, according to the present invention, the switch driving means interlocked with the door of the heating chamber, the first and second switches operated by the switch driving means, and the door detection circuit for detecting opening and closing of the door are provided. A control circuit and a load circuit for supplying a heat source to the heating chamber, wherein the first switch is a bidirectional contact type, a common terminal of the first switch is connected to the commercial power source, and the first switch The normally open contact of the switch is connected to the load circuit, the normally closed contact of the first switch is connected to the control circuit, the second switch is a bidirectional contact type, A common terminal is connected to the commercial power source, a normally open contact of the second switch is connected to the control circuit, and a normally closed contact of the second switch is connected to a normally open contact of the first switch. And the load circuit Connected, the door detection circuit is connected in parallel to the normally open contact of the first switch, The first terminal is connected in parallel to the common terminal and the normally closed contact of the first switch, the common terminal and the normally open contact of the second switch, and turns on and off the commercial power supply and the control circuit. , A second relay, and When the door is fully closed, the switch driving means turns off the normally closed contact of the first switch and turns on the normally open contact of the second switch, and the first and second relays. Becomes OFF,
When the door is half open, the normally closed contact of the first switch is ON, the normally open contact of the second switch is ON by the switch driving means, and the commercial power supply and the control circuit are connected, The control circuit is activated, and when the door detection circuit detects the opening of the door, the control circuit turns on the first and second relays and sets a predetermined time. When fully open, the switch drive means turns on the normally closed contact of the first switch, turns off the normally opened contact of the second switch, and the control circuit has passed the predetermined time. When the first and second relays are turned off, the commercial power supply and the control circuit are shut off. of Thus, the power of the control circuit consumed when the door is opened can be reduced.
[0032]
Further, the switch driving means includes first and second latches provided on the door, a guide portion provided on the heating chamber side, and interlocking the first and second latches by opening and closing the door, and the heating chamber side. The first and second rotary levers are provided so that the knobs of the first and second switches can be moved in and out in conjunction with the operations of the first and second latches. Control according to the opening and closing of the door can be performed by the configuration.
[Brief description of the drawings]
FIG. 1 is a perspective view of a high-frequency heating device showing an embodiment of the present invention.
FIG. 2 is an operation explanatory diagram of a high-frequency heating device showing an embodiment of the present invention.
FIG. 3 is an operation circuit diagram of the high-frequency heating device showing the embodiment of the present invention.
FIG. 4 is an operation explanatory diagram of a high-frequency heating device showing an embodiment of the present invention.
FIG. 5 is an operation circuit diagram of the high-frequency heating device showing the embodiment of the present invention.
FIG. 6 is an operation explanatory view of the high-frequency heating device showing the embodiment of the present invention.
FIG. 7 is an operation circuit diagram of the high-frequency heating device showing the embodiment of the present invention.
FIG. 8 is an operation explanatory view of the high-frequency heating device showing the embodiment of the present invention.
FIG. 9 is an operation circuit diagram of the high-frequency heating device showing the embodiment of the present invention.
FIG. 10 is a flowchart of the operation of the high-frequency heating device showing the embodiment of the present invention.
FIG. 11 is an operation timing chart of the high-frequency heating device showing the embodiment of the present invention.
FIG. 12 is a longitudinal sectional view of a main part of a conventional high-frequency heating device.
FIG. 13 is an operation explanatory diagram of a conventional high-frequency heating device.
FIG. 14 is an operation circuit diagram of a conventional high-frequency heating device.
FIG. 15 is a flowchart of the operation of a conventional high-frequency heating device.
FIG. 16 is a timing chart of the operation of the conventional high-frequency heating device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body, 2 Heating chamber, 3 Door, 5 Handle, 6 Latch, 8, 11 Rotation lever, 10 Latch switch, 13 Door switch, 14 Monitor switch, 15 Commercial power supply, 27, 28 Relay, 29 Control circuit, 30 Microcomputer , 31 power supply circuit, 34 door detection circuit, 35 output circuit, 60 load circuit.

Claims

Switch driving means interlocking with the door of the heating chamber;
First and second switches operated by the switch driving means;
A control circuit having a door detection circuit for detecting opening and closing of the door;
A load circuit for supplying a heat source to the heating chamber;
With
The first switch is a bidirectional contact type, a common terminal of the first switch is connected to the commercial power source, a normally open contact of the first switch is connected to the load circuit, and the first switch The normally closed contact of the switch is connected to the control circuit,
The second switch is a bidirectional contact type, a common terminal of the second switch is connected to the commercial power source, a normally open contact of the second switch is connected to the control circuit, and the second switch The normally closed contact of the switch is connected to the normally open contact of the first switch and to the load circuit,
The door detection circuit is connected in parallel to the normally open contact of the first switch;
First connected to the common terminal and the normally closed contact of the first switch, the common terminal and the normally open contact of the second switch, respectively, in parallel to turn on and off the commercial power supply and the control circuit. , A second relay, and
When the door is fully closed, the switch driving means turns off the normally closed contact of the first switch and turns on the normally open contact of the second switch, and the first and second relays. Becomes OFF,
When the door is half open, the normally closed contact of the first switch is ON, the normally open contact of the second switch is ON by the switch driving means, and the commercial power supply and the control circuit are connected, The control circuit is activated, and the control circuit turns on the first and second relays when a door opening is detected by the door detection circuit, and sets a predetermined time,
When the door is fully opened, the switch driving means turns on the normally closed contact of the first switch and turns off the normally opened contact of the second switch, and the control circuit performs the predetermined time. When the time elapses, the first and second relays are turned off, and the commercial power supply and the control circuit are shut off.

The switch driving means includes first and second latches provided on the door,
A guide portion provided on the heating chamber side, and interlocking the first and second latches by opening and closing the door;
First and second rotary levers that are rotatably provided on the heating chamber side and project and retract the knobs of the first and second switches in conjunction with the operations of the first and second latches, respectively. The high-frequency heating device according to claim 1.