JP5777757B2 - 無線電力送信システムにおける異物検知装置及び方法 - Google Patents
無線電力送信システムにおける異物検知装置及び方法 Download PDFInfo
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Description
異物感知に対応してパワーを制限する動作を行う装置及び方法を提供することにある。
他の例として、無線電力送信装置又は無線電力受信装置は、充電中に前記単方向通信及び前記双方向通信を同時に実行し、又は独立的に実行して異物を検知することができる。
Claims (13)
- 無線電力受信装置における異物を検出する方法において、
最初充電前に異物検知動作を実行するステップ、
充電が開始される時まで異物が検知されない場合、単方向通信又は双方向通信を利用して充電中に異物検知動作を実行するステップ、及び、
前記充電中の異物検知動作で異物が検知されない場合、検知されない微細な異物を温度センサで検知して電力を制限するステップを含み、
前記最初充電前の異物検知動作は、
ピングフェーズでデジタルピングを実行する無線電力送信装置から電力信号を受信するステップ、
前記電力信号を受信した強度を指示する信号強度パケット、前記無線電力受信装置の固有IDを指示する識別パケット及び前記無線電力受信装置の構成情報を生成して前記無線電力送信装置に送信し、外部負荷に連結される出力端子の初期電圧を測定するステップ、及び、
前記初期電圧がホールド状態であり、前記初期電圧の定常状態の値が所定基準電圧範囲内に存在する場合、異物検出フェーズに進入して異物状態パケットを生成して前記無線電力送信装置に送信するステップを含む、方法。 - 前記単方向通信を利用する充電中の異物検知動作は、
前記無線電力送信装置で異物が検知されない場合、充電モードでは一次コイルに電力を印加して誘導磁場又は共振を発生させる前記無線電力送信装置から無線電力を受信するステップを含む請求項1に記載の方法。 - 前記双方向通信を利用する充電中の異物検知動作は、
充電モードで一次コイルに電力を印加して誘導磁場又は共振を発生させた前記無線電力送信装置から、測定された送信電力を指示する送信電力測定報告を受信するステップ、
前記受信された送信電力の値と測定した受信電力の値との差に基づいて異物を検知するステップ、及び、
前記異物の検知結果を含むASK信号を前記無線電力送信装置に送信するステップを含む請求項1に記載の方法。 - 前記送信電力測定報告は、FSK方式を利用して送信されるFSK信号で送信され、
前記FSK信号は、AC電流信号によって前記一次コイルで生成される電力を測定した送信電力量を含む請求項3に記載の方法。 - 前記FSK信号は、所定周期ごとに繰り返し送信され、
前記所定周期は、所定個数のデータ信号が送信される区間であることを特徴とする請求項4に記載の方法。 - 前記FSK信号は、要求される固定された電力周波数を変換させる一定範囲の可変周波数をスイッチングし又はセレクトすることで、0又は1を送信する信号であることを特徴とする請求項4又は請求項5に記載の方法。
- 前記ASK信号は、前記無線電力送信装置が磁気誘導方式に基づいて無線電力を生成するように要求する情報である要求電力情報を含む請求項3から請求項6の何か1項に記載の方法。
- 異物を検出する無線電力受信装置であって、
無線電力送信装置に具備された一次コアブロックと磁気誘導又は磁気共振により結合することによって無線電力を前記無線電力送信装置から受信する二次コアブロック、
前記二次コアブロックに連結され、前記二次コアブロックで生成されるAC波形に対する全波整流を実行して制御ユニットと外部負荷に電力を提供する整流ユニット、及び、
前記外部負荷に連結される出力端子の初期電圧を測定し、前記初期電圧が基準電圧範囲に存在する場合、前記無線電力受信装置を異物検出フェーズに進入するように制御する制御ユニットを含み、
前記制御ユニットは、
最初充電前に異物検知動作を実行し、又は充電が開始される時まで異物が検知されない場合、単方向通信又は双方向通信を利用して充電中に異物検知動作を実行し、又は前記充電中の異物検知動作で異物が検知されない場合、検知されない微細な異物を温度センサで検知して電力を制限し、
前記最初充電前の異物検知動作は、
ピングフェーズでデジタルピングを実行する無線電力送信装置から電力信号を受信し、前記電力信号を受信した強度を指示する信号強度パケット、前記無線電力受信装置の固有IDを指示する識別パケット及び前記無線電力受信装置の構成情報を生成して前記無線電力送信装置に送信し、前記異物検出フェーズで異物状態パケットを生成して前記無線電力送信装置に送信することを特徴とする無線電力受信装置。 - 前記制御ユニットは、
充電モードで一次コイルに電力を印加して誘導磁場又は共振を発生させた前記無線電力送信装置から、測定された送信電力を指示する送信電力測定報告を受信し、前記受信された送信電力の値と測定した受信電力の値との差に基づいて異物を検知し、前記異物の検知結果を含むASK信号を前記無線電力送信装置に送信するように制御して前記双方向通信を利用する充電中の異物検知動作を実行する請求項8に記載の無線電力受信装置。 - 前記送信電力測定報告は、FSK方式を利用して送信されるFSK信号で送信され、
前記FSK信号は、AC電流信号によって前記一次コイルで生成される電力を測定した送信電力量を含む請求項9に記載の無線電力受信装置。 - 前記FSK信号は、所定周期ごとに繰り返し送信され、
前記所定周期は、所定個数のデータ信号が送信される区間であることを特徴とする請求項10に記載の無線電力受信装置。 - 前記FSK信号は、要求される固定された電力周波数を変換させる一定範囲の可変周波数をスイッチングし又はセレクトすることで、0又は1を送信する信号であることを特徴とする請求項10又は請求項11に記載の無線電力受信装置。
- 前記ASK信号は、前記無線電力送信装置が磁気誘導方式に基づいて無線電力を生成するように要求する情報である要求電力情報を含む請求項9から請求項12の何か1項に記載の無線電力受信装置。
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