【０００１】
【発明の属する技術分野】
本発明は、圧縮機負荷の能力に応じず、圧縮機駆動装置のスイッチングによって、圧縮機の各相巻線から浮遊容量として、アースへと流入する漏れ電流に関し、圧縮機駆動の制御手段から与えられた信号で漏れ低減の駆動手段を制御すると、漏れ検出用のコモンチョークコイルを用いずオープンループ制御が行えて、漏れ電流や雑音ノイズ対策用の電気回路が簡易化できる。
【０００２】
【従来の技術】
交流電源の電圧を直流電圧に整流するための整流回路を介し、この直流電圧を半導体素子でＯＮ／ＯＦＦさせるタイミングを変えることで、直流電圧の増減および周波数を変換した出力が圧縮機駆動電力として圧縮機に供給される。
【０００３】
圧縮機のケースは安全のためユニット（空気調和機、冷凍サイクル装置（例えば、冷蔵庫）および給湯機）の接地端を介して大地アースに接続される。圧縮機の各相巻線と大地アース間には浮遊容量成分が発生し、圧縮機駆動装置の半導体素子でＯＮ／ＯＦＦさせたスイッチング周波数成分が、圧縮機の各相巻線からケース間の浮遊容量成分を通してユニットの接地端を介し、大地アースへと漏れ電流として流出入する。
【０００４】
この流出入する漏れ電流成分は、交流電源のアース接地端を通り、ラインノイズとして高周波成分が圧縮機駆動装置に重畳することで圧縮機の信頼性や騒音問題、また家電製品やブレーカ等の誤作動となり、さらに漏れ電流に含有されている低次および高次高調波の周波成分に関し、漏れ電流の低減方法による対策が検討されている。
【０００５】
低次および高次高調波の周波数成分を有する漏れ電流を低減するために、コモンコイルを交流電源と整流回路間または整流回路と圧縮機駆動装置間に挿接して、圧縮機駆動装置の半導体素子をスイッチでＯＮ／ＯＦＦさせるタイミングや圧縮機の性能に応じて、大きなラインフィルタや補償回路を設けて低減効果を得てきたが、圧縮機負荷の能力に応じて漏れ電流や雑音ノイズ低減を考慮した電気品は、設置スペースやコスト上昇等の問題を有していた。
【０００６】
例として、従来この種の圧縮機駆動装置を備えた空気調和機、冷凍サイクル装置（例えば、冷蔵庫）は特開平１０−４２５８５号公報に示すようなものがある。スイッチング周波数が高い場合でも、高周波漏れ電流を低減し、これにより圧縮機能力を高めることができて、十分な空調能力を得られる冷凍サイクル装置のインバータ装置を提供している。
【０００７】
すなわち、圧縮機モータの相巻線からアースへと流れる零相電流を検出し、検出した零相電流に相似する波形の電流を作成し、その作成した電流によって圧縮機モータからの高周波漏れ電流を強制的に打消す制御である。
【０００８】
【特許文献１】
特開平１０−４２５８５号公報
【０００９】
【発明が解決しようとする課題】
従来技術では高周波漏れ電流を低減させるために、Ａ級プッシュプル回路構成を備えることで、アース流入の低減を図っていたが、高周波成分をトランジスタ（ＮＰＮ，ＰＮＰ）によって、高周波スイッチングさせるとスイッチのＯＮ／ＯＦＦ時のバラツキと圧縮機負荷に応じて、漏れ電流値が不安定に振れるという不具合が生じるため、そのために補償回路が別途必要とされなければ、確実に漏れ電流を低減させられない等の課題を有していた。
【００１０】
そこで、本発明は上述の点を考慮して、アースに流入する漏れ電流が圧縮機を備えた空気調和機や冷凍サイクル装置（例えば、冷蔵庫）および給湯機において、高い圧縮機能力で駆動し、且つ如何なる圧縮機駆動制御で運転しても、マイコンから圧縮機駆動のＰＷＭ制御信号で駆動した際に生じる瞬時電流（漏れ電流）を打ち消すために、圧縮機駆動の制御信号と同じタイミングで漏れ低減駆動の手段であるプッシュプル回路を最適デューティからなるＰＷＭ制御信号で駆動することにより、漏れ低減の高周波スイッチングでの打ち消し電流のバラツキを抑え、熱損失や漏れ電流の補償回路を必要としない為、漏れ電流と雑音ノイズ対策を考慮した電気回路が簡素化される。また人体に影響を及ぼす低次および高次高調波の周波数成分も低減されて、漏れ電流量も（ＪＩＳ Ｃ ９２１９：１９９３）１ｍＡ以下となるための制御手段を用いた漏れ電流キャンセラ回路を提供することを目的とする。
【００１１】
【課題を解決するための手段】
上記課題を解決するため、請求項１にかかる発明は、圧縮機の各相巻線と大地アース間に生ずる浮遊容量成分によって流れる漏れ電流成分を、圧縮機駆動装置と圧縮機回転数検出手段と圧縮機と圧縮機駆動の制御手段と漏れ低減の駆動手段で構成された漏れ電流キャンセラ回路において、漏れ電流の検出手段を用いないオープンループ制御として、漏れ増減のレベル（ゼロクロス点）を決める位相検出手段と予め測定した漏れの基準絶対量から、圧縮機駆動の制御手段（マイコン）を介して、圧縮機駆動と同じタイミングで発生する漏れ瞬時電流を打ち消すように、圧縮機駆動の制御手段で、基準量の条件設定及び補正を掛けた信号で漏れ低減の駆動手段をＰＷＭ制御すると、圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機を高い圧縮機の能力および如何なる圧縮機駆動制御で運転しても、アース流入の漏れ電流を低減するための手段を設けたものである。
【００１２】
請求項２にかかる発明は、交流電源と整流回路の間に挿接されたコモンコイルを漏れ検出手段として備えた閉ループ制御において、予め測定した基準絶対量と電流検出手段による偏差値に応じて、漏れ増減のレベルを決める位相検出手段から、漏れ低減の駆動手段を圧縮機駆動のスイッチングのタイミングに合わせて、圧縮機駆動の制御手段から与えられた信号でＰＷＭ制御すると、圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機を高い圧縮機の能力および如何なる圧縮機駆動制御で運転しても、アース流出入の漏れ電流には、低次および高次高調波の周波数成分が低減できる手段を設けたものである。
【００１３】
請求項３にかかる発明は、漏れの電流検出手段を用いる閉ループ制御において、予め測定した基準絶対量と漏れ電流の検出手段と圧縮機実回転数と漏れ増減レベルを決める位相検出手段に応じて偏差テーブルを引き、漏れ低減の駆動手段を圧縮機駆動の制御手段によって、最適デューティ選定によるＰＷＭ制御をすると、圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機を高い圧縮機の能力および如何なる圧縮機駆動制御で運転しても、アース流入の漏れ電流を効果的に低減できる手段を設けたものである。
【００１４】
請求項４にかかる発明は、ノイズの少ない圧縮機駆動装置を備えた空気調和機と冷凍サイクル装置および給湯機において、漏れ検出しないオープンループ制御で、圧縮機実回転数と漏れ増減のレベルを決める位相検出手段と漏れ電流の条件設定値（閉ループ制御で予め得られた瞬時電流の時間幅、ディレイ時間、勾配、補正量を例えばＥＥＰＲＯＭで対応）から、最適なデューティの偏差テーブルを用い、圧縮機駆動用の制御手段から与えられたＰＷＭ制御信号で、漏れ低減の駆動手段として用いるスイッチをＯＮ／ＯＦＦすることにより、アース流入の漏れ電流を低減できる手段を設けたものである。
【００１５】
【発明の実施の形態】
本発明は各請求項に記載の形態で実施できるものであり、請求項１のように、圧縮機駆動装置から圧縮機の各相巻線と大地アース間に生ずる浮遊容量成分によって流れる漏れ電流成分を、前記圧縮機駆動装置１と圧縮機回転数検出手段２と圧縮機３、漏れ低減の駆動手段５で構成された前記漏れ電流キャンセラ回路９のおいて、漏れ検出を用いないオープンループ制御で、前記漏れ増減のレベルを決める位相検出手段６と予め測定した漏れの基準絶対量７から前記圧縮機駆動の制御手段８を介して、前記漏れ低減の駆動手段（ＮＰＮ，ＰＮＰトランジスタ）を高周波（ＰＷＭ制御）スイッチングすると、漏れ低減の打ち消し電流のバラツキを抑え、またスイッチングの熱損失から漏れ電流の補償回路を設けること無く、圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機を高い圧縮機の能力および如何なる圧縮機駆動制御で運転しても、アース流入の漏れ電流を低減する効果がある。
【００１６】
また、請求項２記載のように、漏れ電流キャンセラ回路９は、前記交流電源と整流回路の間に挿接されたコモンコイルを漏れ検出手段４として備え（閉ループ制御）、予め測定した基準絶対量７と電流検出手段による偏差値に応じて、前記漏れ増減のレベルを決める位相検出手段６から、前記圧縮機駆動の制御手段８を介して、圧縮機駆動と同じタイミングで瞬時値の漏れ電流を打ち消す用に漏れ低減の駆動手段５をＰＷＭ制御でスイッチのＯＮ／ＯＦＦすると、圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機を高い圧縮機の能力および如何なる圧縮機駆動制御で運転しても、アース流入における低次および高次高調波の周波数成分が含有された漏れ電流量も（ＪＩＳ Ｃ ９２１９：１９９３）１ｍＡ以下とする効果がある。
【００１７】
また、請求項３記載のように、漏れ電流キャンセラ回路９は、前記予め測定した基準絶対量７と漏れの電流検出手段４（閉ループ制御）による偏差値と圧縮機回転数手段２に応じて、前記漏れ増減のレベルを決める位相検出手段６から、前記圧縮機駆動の制御手段８で引かれた偏差テーブルを介して、圧縮機駆動と同じタイミングで直接に前記漏れ低減の駆動手段５を最適デューティ選定によるＰＷＭ制御することで、圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機を高い圧縮機の能力および如何なる圧縮機駆動制御で運転しても、アース流入の漏れ電流量も（ＪＩＳ Ｃ ９２１９：１９９３）１ｍＡ以下で圧縮機駆動装置への雑音ノイズおよび騒音レベルを効果的に低減できる。
【００１８】
また、請求項４記載のように、漏れ電流キャンセラ回路９は、ノイズの少ない前記圧縮機駆動装置を備えた空気調和機と冷凍サイクル装置および給湯機において、高い圧縮機能力で駆動しても、圧縮機の回転数検出手段２と前記漏れ増減のレベルを決める位相検出手段６と漏れ電流の条件設定手段１０から、前記圧縮機駆動の制御手段８で引かれた偏差テーブルを介して、前記漏れ低減の駆動手段５を最適なデューティ選定によるＰＷＭ制御をすることで、コモンコイルからの漏れ電流の検出手段４と高周波スイッチングによる打ち消し電流のバラツキ低減と熱損失補償回路を用いること無く、前記アース流入の漏れ電流を抑制するため、圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機の交流電源側のフィルタ回路および圧縮機駆動装置の低コスト化や回路構成が簡易化する効果がある。
【００１９】
以下、本発明の実施例について図面を用いて説明する。
【００２０】
図１は、本発明の第１実施の形態に係る圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機の電気回路の全体構成に設置された漏れ電流キャンセラ回路（漏れ電流を検出手段としないオープンループ制御と圧縮機の回転数検出手段を備えない構成）を示し、図２に同図１のキャンセラ回路の漏れ低減による制御パターンを示す。
【００２１】
同図１において、請求項１にかかる発明の漏れ電流キャンセラ回路９は、予め測定した漏れ電流の基準絶対量７応じて、漏れ増減を判別するゼロ電圧の位相検出手段６から、圧縮機駆動の制御手段８（マイコン）で漏れ低減の駆動手段５（プッシュプル回路）を交流電圧の正と負の半周期ずつに分けてＮＰＮ、ＰＮＰトランジスタを図２のスイッチングパターンによるＰＷＭ制御をすると、圧縮機からユニット設置端の漏れ電流は、トランジスタのエミッタ側の抵抗と２重絶縁で且つ直流分除去用のコンデンサを介して、アースに流入させることにより、コモンコイルからの漏れ電流の検出手段４を検出として用いず、またプッシュプル回路のＮＰＮ、ＰＮＰトランジスタに、高周波スイッチングによる打ち消し電流のバラツキ低減と熱損失補償回路を備えることなく漏れ電流を抑制できる。
【００２２】
図３は、本発明の第２実施の形態に係る圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機の電気回路の全体構成に設置された漏れ電流キャンセラ回路（漏れ電流の検出手段を備えた閉ループ制御、圧縮機の回転数検出手段は備えていない構成）を示す。
【００２３】
同図３において、請求項２にかかる発明の漏れ電流キャンセラ回路９は、交流電源と整流回路の間に挿接されたコモンコイルからの漏れ検出手段４による電流に応じたＩ０電流制限値を算出する。算出された制限値から予め測定した漏れ電流の基準絶対量７との電流偏差ΔＩ０から漏れ電流の過電流制御レベルを作成し、ＰＷＭ制御のデューティを選定したテーブルを図４に示す。また、図５は、第２実施の圧縮機回転数に対するアース流入の漏れ電流特性である。
【００２４】
同図５において、圧縮機回転数における漏れ電流の基準値を０．５［ｍＡ］、制限値上限を１．０［ｍＡ］で制限値下限を０．１［ｍＡ］とする。例えば、圧縮機回転数が４０００［ｍｉｎ−１］の時、漏れ電流の基準値とコモンコイルから検出した漏れ電流との偏差ΔＩ０は制限値上限の１．０［ｍＡ］を超えているため、同図４のテーブルからレベル０が選択され、ＰＷＭ制御のデューティは１００％となり、漏れ増減を判別するゼロ電圧の位相検出手段６から、圧縮機駆動の制御手段８（マイコン）でプッシュプル回路のＮＰＮ、ＰＮＰトランジスタをＯＮ／ＯＦＦすることにより、圧縮機からユニット設置端の漏れ電流は、トランジスタのエミッタ側の抵抗と直流分除去用のコンデンサを介して、人体に影響を及ぼす低次および高次高調波が含有された電流量は、キャンセル前よりも低減される。
【００２５】
図６は、本発明の第３実施の形態に係る圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機の電気回路の全体構成に設置された漏れ電流キャンセラ回路（漏れ電流の検出手段（閉ループ制御）と圧縮機の回転数検出手段を備える構成）を示す。
【００２６】
同図６において、請求項３にかかる発明の漏れ電流キャンセラ回路９は、交流電源と整流回路の間に挿接されたコモンコイルからの漏れ検出手段４による電流と高いサンプリング時間を有した圧縮機の回転数検出手段から検出した実回転数に応じたＩ０電流制限値を算出する。算出された制限値から予め測定した漏れ電流の基準絶対量７との電流偏差ΔＩ０と指令回転数Ｎ＊と実回転数Ｎにおける回転数偏差ΔＮから、漏れ電流の過電流制御レベルを作成することで図７に示すような最適ＰＷＭ制御のデューティを選定し、ゼロ電圧検出を介してプッシュプル回路のＮＰＮ、ＰＮＰトランジスタをＯＮ／ＯＦＦすることにより、圧縮機からユニット設置端の漏れ電流は、トランジスタのエミッタ側の抵抗と直流分除去用のコンデンサを介して、アース流入の漏れ電流が圧縮機回転数の急な変化量に関係なく、また圧縮機駆動装置への雑音ノイズや振動・騒音を低減させ、効果的に漏れ電流を１ｍＡ以下にできる。
【００２７】
図８は、本発明の第４実施の形態に係るノイズの少ない圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機の電気回路の全体構成に設置された漏れ電流キャンセラ回路（漏れ電流の検出手段は備えず、圧縮機の回転数検出手段を備える構成）を示す。
【００２８】
同図８において、請求項４にかかる発明の漏れ電流キャンセラ回路９は、請求項３にかかる発明の図７に示された最適ＰＷＭ制御のデューティ選定と漏れ電流条件設定値（閉ループ制御で予め得られた瞬時電流の時間幅、ディレイ時間、勾配、補正量を例えばＥＥＰＲＯＭで対応）を用いることで、漏れ検出を用いずにマイコンのみでオープンループ制御して、高いサンプリング時間を有した圧縮機の回転数検出手段から検出した実回転数に応じたＩ０電流制限値を同図７よりマイコンで選定することで、最適ＰＷＭ制御のデューティを選定し、ゼロ電圧検出を介してプッシュプル回路のＮＰＮ、ＰＮＰトランジスタをＯＮ／ＯＦＦすることにより、圧縮機からユニット設置端の漏れ電流は、トランジスタのエミッタ側の抵抗と直流分除去用のコンデンサを介して、漏れ電流を低減できるため、圧縮機駆動装置の低コスト化や回路構成が確実に小型化することができる。
【００２９】
【発明の効果】
以上説明したように本発明にあっては、圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機の電気回路および圧縮機駆動装置における漏れ電流キャンセラ回路において、圧縮機の各相巻線と大地アース間に生ずる浮遊容量成分によって流れる漏れ電流成分を、前記圧縮機駆動装置１と圧縮機回転数検出手段２と圧縮機３、漏れ低減の駆動手段５で構成された漏れ電流キャンセラ回路９のおいて、漏れ増減のレベルを判別するゼロ電圧の位相検出手段６と予め測定した漏れの基準絶対量７から圧縮機駆動の制御手段８を介して、圧縮機駆動のタイミングに合わせた信号を与えてＰＷＭ制御することで、漏れ低減の駆動手段（ＮＰＮ，ＰＮＰトランジスタ）を高周波スイッチングによる打ち消し電流のバラツキ低減と熱損失から補償回路を設けること無く簡易化され、圧縮機を搭載した空気調和機と冷凍サイクル装置（例えば、冷蔵庫）および給湯機を高い圧縮機の能力および如何なる圧縮機駆動制御で運転しても、アース流入の漏れ電流を低減する効果がある。
【００３０】
従来の漏れ低減技術では高周波漏れ電流を低減させるために、Ａ級プッシュプル回路構成を備えることで、アース流入の低減を図っていたが、高周波成分をトランジスタ（ＮＰＮ，ＰＮＰ）によって、高周波スイッチングさせるとスイッチのＯＮ／ＯＦＦによる打ち消し電流のバラツキと熱損失が大きくなるという不具合が生じるため、そのために効果的に電流を抑制させ、損失を低減させる補償回路が別途必要とされなければ、確実に漏れ電流を低減させることが困難とされ、また圧縮機の性能に応じて、交流電源側に大きなラインフィルタを設けて低減効果を得てきたが、設置スペースやコスト上昇等の問題を有していたが、上記の問題点を解決し、本発明のオープンループ制御による漏れ電流キャンセラ回路を備えることで１ｍＡ以下にアース流入の漏れ電流量を確実に低減できるようになる。
【図面の簡単な説明】
【図１】本発明における第１実施の漏れ電流キャンセラ回路の構成図である。
【図２】本発明の第１実施に係る漏れ電流キャンセラ回路の漏れ低減による制御のパターン図である。
【図３】本発明における第２実施の漏れ電流キャンセラ回路の構成図である。
【図４】本発明における第２実施の電流偏差におけるＰＷＭ制御デューティテーブルの図である。
【図５】本発明における第２実施の一例として、実回転数に対するアース流入の漏れ電流の測定結果である。
【図６】本発明における第３実施の漏れ電流キャンセラ回路の構成図である。
【図７】本発明における第３実施の回転数偏差ΔＮにおける電流偏差ΔＩ０により選定された最適ＰＷＭ制御のデューティ特性図である。
【図８】本発明における第４実施の漏れ電流キャンセラ回路の構成図である。
【符号の説明】
１…圧縮機駆動装置、２…圧縮機の回転数検出手段、３…圧縮機、４…コモンコイルによる漏れ電流の検出手段、５…漏れ低減の駆動手段、６…漏れ増減を判別するゼロ電圧の位相検出手段、７…予め測定した漏れ電流の基準絶対量、８…圧縮機駆動の制御手段、９…漏れ電流キャンセラ回路、１０…漏れ電流の条件設定手段。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a leakage current flowing from each phase winding of a compressor to a ground as a floating capacity by switching of a compressor driving device, regardless of the capacity of a compressor load, and is provided from a compressor driving control means. When the drive means for reducing leakage is controlled by the received signal, open-loop control can be performed without using a common choke coil for leakage detection, and an electric circuit for measures against leakage current and noise noise can be simplified.
[0002]
[Prior art]
Through a rectifier circuit for rectifying the voltage of the AC power supply to a DC voltage, the timing of turning on / off the DC voltage by a semiconductor element is changed, so that the output obtained by increasing / decreasing the DC voltage and converting the frequency is used as compressor drive power. Supplied to the compressor.
[0003]
The case of the compressor is connected to earth ground via the ground end of the unit (air conditioner, refrigeration cycle device (for example, refrigerator) and water heater) for safety. A stray capacitance component is generated between each phase winding of the compressor and the ground, and a switching frequency component turned on / off by a semiconductor element of the compressor driving device is strayed from each phase winding of the compressor to the case. Through the capacitance component, it flows into and out of the earth via the grounding terminal of the unit as a leakage current.
[0004]
The leakage current component flowing in and out passes through the grounded end of the AC power supply, and the high frequency component is superimposed on the compressor driving device as line noise, thereby causing a problem of the reliability and noise of the compressor, and errors in home appliances and breakers. After the operation, the countermeasures for the low-order and high-order harmonic frequency components contained in the leakage current by a method of reducing the leakage current are being studied.
[0005]
In order to reduce leakage current having low-order and high-order harmonic frequency components, a common coil is inserted between an AC power supply and a rectifier circuit or between a rectifier circuit and a compressor drive device, and a semiconductor element of the compressor drive device is inserted. According to the timing of turning on / off the switch and the performance of the compressor, a large line filter and a compensation circuit are provided to reduce the noise. However, the reduction of leakage current and noise noise is considered according to the capacity of the compressor load. The electric appliances have problems such as increased installation space and cost.
[0006]
As an example, an air conditioner and a refrigeration cycle apparatus (for example, a refrigerator) provided with a compressor driving device of this type in the related art are disclosed in JP-A-10-42585. Provided is an inverter device for a refrigeration cycle device that can reduce high-frequency leakage current even when the switching frequency is high, thereby increasing the compression function, and obtaining sufficient air-conditioning capacity.
[0007]
That is, a zero-phase current flowing from the phase winding of the compressor motor to the ground is detected, a current having a waveform similar to the detected zero-phase current is created, and a high-frequency leakage current from the compressor motor is generated by the created current. This is control to forcibly cancel.
[0008]
[Patent Document 1]
JP-A-10-42585
[Problems to be solved by the invention]
In the prior art, in order to reduce high-frequency leakage current, a class A push-pull circuit is provided to reduce the inflow of ground. However, when high-frequency components are subjected to high-frequency switching by transistors (NPN, PNP), the switching of the switch is reduced. Since the leakage current value fluctuates in an unstable manner depending on the ON / OFF variation and the compressor load, the leakage current cannot be reliably reduced unless a compensating circuit is separately required. Had the problem of.
[0010]
In view of the above, in the present invention, the leakage current flowing into the ground is driven by a high compression function in an air conditioner or a refrigeration cycle device (for example, a refrigerator) and a water heater provided with a compressor, In addition, no matter what kind of compressor drive control is performed, the leakage is reduced at the same timing as the compressor drive control signal in order to cancel the instantaneous current (leakage current) generated when the microcomputer is driven by the compressor drive PWM control signal. By driving the push-pull circuit, which is the driving means, with the PWM control signal having the optimum duty, the variation of the canceling current in high-frequency switching for reducing leakage is suppressed, and a heat loss or leakage current compensating circuit is not required. The electric circuit considering the leakage current and noise noise countermeasures is simplified. Also provided is a leakage current canceller circuit using control means for reducing the frequency components of low-order and high-order harmonics affecting the human body and reducing the leakage current to 1 mA or less (JIS C 9219: 1993). The purpose is to:
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 relates to a compressor driving device and a compressor rotation speed detecting means for detecting a leakage current component flowing due to a stray capacitance component generated between each phase winding of a compressor and the ground. In a leakage current canceller circuit composed of a compressor, control means for driving the compressor, and driving means for reducing leakage, phase detection for determining the level of increase / decrease of leakage (zero cross point) as open loop control without using leakage current detection means. From the means and the reference absolute amount of leakage measured in advance, the compressor drive control means, via the compressor drive control means (microcomputer), cancels the instantaneous leakage current generated at the same timing as the compressor drive, When the drive means for leakage reduction is subjected to PWM control using a signal obtained by setting and correcting the reference amount, an air conditioner equipped with a compressor and a refrigeration cycle device (for example, refrigeration) ) And also driving a water heater in capacity and any compressor drive control of the high compressor, is provided with a means for reducing the leakage current of the ground inflow.
[0012]
According to a second aspect of the present invention, in a closed loop control including a common coil inserted and connected between an AC power supply and a rectifier circuit as a leak detection unit, in accordance with a previously measured reference absolute amount and a deviation value by the current detection unit, From the phase detection means for determining the level of increase or decrease of the leakage, the drive means for the leakage reduction is PWM-controlled by the signal given from the control means for the compressor drive in accordance with the timing of the switching of the compressor drive. Even if the harmony machine and the refrigeration cycle device (for example, a refrigerator) and the water heater are operated with high compressor capacity and any compressor drive control, the leakage current flowing into and out of the earth will have low and high harmonic frequencies. A means capable of reducing the components is provided.
[0013]
According to a third aspect of the present invention, in the closed loop control using the leakage current detection means, the deviation is determined according to the reference absolute amount measured in advance, the leakage current detection means, the compressor actual rotation speed, and the phase detection means for determining the leakage increase / decrease level. When the table is pulled and the drive means for reducing leakage is subjected to PWM control by selecting the optimum duty by the control means for driving the compressor, an air conditioner equipped with a compressor, a refrigeration cycle device (for example, a refrigerator) and a water heater are compressed at a high compression rate. Means are provided for effectively reducing the leakage current flowing into the ground, even when the compressor is operated with the capacity of the compressor and any compressor drive control.
[0014]
According to a fourth aspect of the present invention, in an air conditioner, a refrigeration cycle device, and a water heater provided with a compressor driving device with less noise, the actual rotation speed of the compressor and the level of increase / decrease in leak are determined by open loop control without leak detection. Compressor using an optimum duty deviation table from the phase detection means and the condition setting value of the leakage current (the time width, delay time, gradient, and correction amount of the instantaneous current obtained in advance by closed-loop control are supported by, for example, EEPROM). A means for reducing the leakage current flowing into the ground is provided by turning on / off a switch used as a leakage reduction driving means by a PWM control signal provided from a driving control means.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention can be embodied in the form described in each claim. As described in claim 1, a leakage current component flowing from a compressor driving device due to a stray capacitance component generated between each phase winding of the compressor and the earth ground. In the leakage current canceller circuit 9 configured by the compressor driving device 1, the compressor rotation speed detecting means 2, the compressor 3, and the leakage reducing driving means 5, the open current control is performed without using the leak detection. The driving means (NPN, PNP transistor) for reducing the leakage is supplied to a high frequency (NPN, PNP transistor) from the phase detecting means 6 for determining the level of increase or decrease of the leakage and the reference absolute amount 7 of the leakage measured in advance via the control means 8 for driving the compressor. PWM control) When switching, suppresses the variation of the canceling current of leakage reduction, and eliminates the need for a leakage current compensation circuit due to the switching heat loss. Refrigeration cycle apparatus sum machine (e.g., a refrigerator) and be operated at capacity and any compressor drive control of the water heater high compressor, an effect of reducing the leakage current of the ground inflow.
[0016]
Further, as described in claim 2, the leakage current canceller circuit 9 includes a common coil inserted between the AC power supply and the rectifier circuit as the leakage detecting means 4 (closed loop control), and the reference absolute value measured in advance. 7 and the instantaneous leakage current at the same timing as the compressor drive from the phase detector 6 which determines the level of increase or decrease of the leak through the compressor drive controller 8 in accordance with the deviation value by the current detector. When the driving means 5 for leakage reduction is turned on / off by PWM control to cancel out, the air conditioner equipped with the compressor, the refrigeration cycle device (for example, a refrigerator) and the water heater have a high compressor capacity and any compressor. Even when operated under drive control, the amount of leakage current containing frequency components of low-order and high-order harmonics in the ground inflow is also 1 mA or less (JIS C 9219: 1993). There is an effect to be.
[0017]
In addition, as described in claim 3, the leakage current canceller circuit 9 calculates the absolute value of the reference 7 measured in advance, the deviation value of the leakage current detection means 4 (closed loop control) and the compressor rotation speed means 2, The driving means 5 for reducing the leakage is directly adjusted to the optimum duty at the same timing as the driving of the compressor from the phase detecting means 6 for determining the level of the increase or decrease of the leakage via the deviation table drawn by the control means 8 for driving the compressor. By performing the PWM control by selection, even if the air conditioner equipped with a compressor, a refrigeration cycle device (for example, a refrigerator) and a water heater are operated with a high compressor capacity and any compressor drive control, leakage of ground inflow is caused. The current amount (JIS C 9219: 1993) is 1 mA or less, and the noise and noise level to the compressor drive device can be effectively reduced.
[0018]
Further, as described in claim 4, the leakage current canceller circuit 9 can be driven with a high compression function in an air conditioner, a refrigeration cycle device, and a water heater provided with the compressor drive device with less noise. From the compressor rotational speed detecting means 2, the phase detecting means 6 for determining the level of increase or decrease of the leakage and the leakage current condition setting means 10, the leakage is detected via a deviation table drawn by the compressor driving control means 8. By performing PWM control by selecting the optimum duty for the drive means 5 for reduction, the means for detecting the leakage current from the common coil 4 and the variation of the canceling current due to the high-frequency switching can be reduced. In order to suppress the leakage current of air, air conditioners equipped with compressors, refrigeration cycle devices (for example, refrigerators) and filters on the AC power supply side of water heaters Low cost and circuit configuration of the capacitor circuit and the compressor driving device is effective to simplify.
[0019]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 shows a leakage current canceler circuit (leakage) installed in the overall configuration of the electric circuit of an air conditioner and a refrigeration cycle device (for example, a refrigerator) and a water heater equipped with a compressor according to the first embodiment of the present invention. FIG. 2 shows a control pattern of the canceller circuit shown in FIG. 1 by reducing leakage, in which open-loop control not using current detection means and no rotation number detection means for the compressor are provided.
[0021]
In FIG. 1, a leakage current canceller circuit 9 according to the first aspect of the present invention uses a zero-voltage phase detection means 6 for determining whether the leakage has increased or decreased according to a reference absolute amount 7 of the leakage current measured in advance. When the control means 8 (microcomputer) divides the drive means 5 (push-pull circuit) for reducing leakage into positive and negative half cycles of the AC voltage and performs PWM control on the NPN and PNP transistors according to the switching pattern of FIG. The leakage current from the unit installation end is detected by the leakage current detection means 4 from the common coil by flowing into the ground through a double-insulated resistor on the emitter side of the transistor and through a capacitor for removing DC components. Not used, and the NPN and PNP transistors of the push-pull circuit reduce the variation of the canceling current and the heat loss by high frequency switching The leakage current can be suppressed without providing a 償回 path.
[0022]
FIG. 3 shows a leakage current canceler circuit (leakage) installed in the overall configuration of an electric circuit of an air conditioner and a refrigeration cycle device (for example, a refrigerator) and a water heater equipped with a compressor according to the second embodiment of the present invention. (Closed loop control with current detection means, configuration without compressor rotation speed detection means).
[0023]
In FIG. 3, the leakage current canceller circuit 9 of the invention according to claim 2, the I 0 current limit value corresponding to a current by the leak detection means 4 from挿接been common coil between an AC power source and the rectifier circuit calculate. FIG. 4 shows a table in which the overcurrent control level of the leakage current is created from the current deviation ΔI 0 of the leakage current and the reference absolute amount 7 measured in advance from the calculated limit value, and the duty of the PWM control is selected. FIG. 5 shows the leakage current characteristic of the earth inflow with respect to the compressor speed according to the second embodiment.
[0024]
In FIG. 5, the reference value of the leakage current at the compressor rotation speed is 0.5 [mA], the upper limit of the limit value is 1.0 [mA], and the lower limit of the limit value is 0.1 [mA]. For example, when the compressor rotation speed is 4000 [min-1], the deviation ΔI 0 between the leakage current reference value and the leakage current detected from the common coil exceeds the upper limit value of 1.0 [mA]. 4, the level 0 is selected from the table of FIG. 4, the duty of the PWM control becomes 100%, and the push-pull circuit is switched from the zero voltage phase detecting means 6 for determining the increase or decrease of leakage to the compressor driving control means 8 (microcomputer). By turning on / off the NPN and PNP transistors, the leakage current from the compressor to the unit installation end can affect the human body through the resistor on the emitter side of the transistor and the capacitor for removing DC components. The amount of current containing the second harmonic is reduced as compared to before the cancellation.
[0025]
FIG. 6 shows a leakage current canceler circuit (leakage) installed in the overall configuration of the electric circuit of an air conditioner and a refrigeration cycle device (for example, a refrigerator) and a water heater equipped with a compressor according to the third embodiment of the present invention. 2 shows a configuration including a current detection unit (closed loop control) and a compressor rotation speed detection unit.
[0026]
In FIG. 6, a leakage current canceller circuit 9 according to a third aspect of the present invention is a compressor having a high sampling time and a current by the leakage detection means 4 from a common coil inserted between an AC power supply and a rectifier circuit. The I0 current limit value corresponding to the actual rotation speed detected by the rotation speed detection means is calculated. From the calculated limit value, the overcurrent control level of the leakage current is created from the current deviation ΔI 0 from the reference absolute amount 7 of the leakage current measured in advance, the rotational speed deviation ΔN at the command rotational speed N * and the actual rotational speed N. By selecting the optimum PWM control duty as shown in FIG. 7 and turning on / off the NPN and PNP transistors of the push-pull circuit through zero voltage detection, the leakage current from the compressor to the unit installation end is Through the resistor on the emitter side of the transistor and the capacitor for removing DC components, the leakage current of the earth inflow is not affected by the sudden change of the compressor rotation speed, and also reduces the noise noise, vibration and noise to the compressor drive. The leakage current can be effectively reduced to 1 mA or less.
[0027]
FIG. 8 is a leakage current canceller installed in the overall configuration of an air conditioner, a refrigeration cycle device (for example, a refrigerator), and an electric circuit of a water heater according to a fourth embodiment of the present invention. 2 shows a circuit (without a means for detecting leakage current but with means for detecting the number of revolutions of a compressor).
[0028]
In FIG. 8, the leakage current canceller circuit 9 of the invention according to claim 4 is adapted to select the duty of the optimum PWM control and the set value of the leakage current condition (obtained in advance by closed loop control) shown in FIG. By using the obtained instantaneous current time width, delay time, gradient, and correction amount in, for example, an EEPROM, open-loop control is performed only by a microcomputer without using leakage detection, and a compressor having a high sampling time is used. By selecting the I0 current limit value corresponding to the actual rotation speed detected by the rotation speed detection means by the microcomputer from FIG. 7, the optimum PWM control duty is selected, and the NPN of the push-pull circuit is detected through the zero voltage detection. By turning on / off the PNP transistor, the leakage current from the compressor to the unit installation end is used to remove the DC resistance and the resistance on the emitter side of the transistor. Since the leakage current can be reduced through the capacitor, the cost of the compressor driving device and the circuit configuration can be reliably reduced.
[0029]
【The invention's effect】
As described above, in the present invention, the air conditioner equipped with the compressor, the refrigerating cycle device (for example, a refrigerator) and the electric circuit of the water heater and the leakage current canceller circuit in the compressor driving device include the compressor of the compressor. The leakage current component flowing due to the stray capacitance component generated between each phase winding and the earth ground is leaked by the compressor drive device 1, the compressor rotation speed detection device 2, the compressor 3, and the leakage reduction drive device 5. In the current canceller circuit 9, the compressor drive timing is determined from the zero voltage phase detection means 6 for determining the level of increase or decrease of the leakage and the compressor reference control means 8 from the previously measured reference absolute amount 7 of the leakage. By applying the combined signal and performing the PWM control, the driving means (NPN, PNP transistor) for leakage reduction can reduce the variation of the canceling current by the high frequency switching. It is simplified without providing a compensation circuit from heat loss, and it is possible to operate an air conditioner equipped with a compressor, a refrigeration cycle device (for example, a refrigerator) and a water heater with a high compressor capacity and any compressor drive control. This has the effect of reducing the leakage current flowing into the ground.
[0030]
In the conventional leakage reduction technology, in order to reduce high-frequency leakage current, a class A push-pull circuit is provided to reduce the inflow of ground. However, high-frequency components are switched at high frequencies by transistors (NPN, PNP). In addition, there is a problem that the variation of the canceling current due to the ON / OFF of the switch and the heat loss increase, so that if a compensating circuit for effectively suppressing the current and reducing the loss is not separately required, the leakage can be surely achieved. It was considered difficult to reduce the current, and depending on the performance of the compressor, a large line filter was provided on the AC power supply side to achieve the reduction effect, but it had problems such as installation space and cost increase. However, by solving the above-mentioned problem and providing the leakage current canceller circuit by the open loop control of the present invention, 1 mA or less is provided. It becomes possible to surely reduce the leakage current of the earth inflow.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a leakage current canceller circuit according to a first embodiment of the present invention.
FIG. 2 is a pattern diagram of control by leakage reduction of a leakage current canceller circuit according to a first embodiment of the present invention.
FIG. 3 is a configuration diagram of a leakage current canceller circuit according to a second embodiment of the present invention.
FIG. 4 is a diagram of a PWM control duty table for a current deviation according to a second embodiment of the present invention.
FIG. 5 shows a measurement result of a leakage current flowing into the earth with respect to an actual rotation speed as an example of the second embodiment of the present invention.
FIG. 6 is a configuration diagram of a leakage current canceller circuit according to a third embodiment of the present invention.
FIG. 7 is a duty characteristic diagram of the optimum PWM control selected by the current deviation ΔI 0 at the rotation speed deviation ΔN according to the third embodiment of the present invention.
FIG. 8 is a configuration diagram of a leakage current canceller circuit according to a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Compressor drive device, 2 ... Compressor rotation speed detecting means, 3 ... Compressor, 4 ... Leakage current detecting means by a common coil, 5 ... Leakage reduction driving means, 6 ... Zero voltage to determine increase / decrease of leakage 7: Reference absolute amount of leakage current measured in advance, 8: Control means for driving the compressor, 9: Leakage current canceller circuit, 10: Condition setting means for leakage current.
