JP5692163B2 - 車両、および送電装置 - Google Patents
車両、および送電装置 Download PDFInfo
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Description
(非接触給電システムの構成)
図1は、この発明の実施の形態に従う車両給電システム(非接触給電システム)10の全体構成図である。図1を参照して、車両給電システム10は、車両100と、送電装置200とを備える。車両100は、受電部110と、通信部160とを含む。また、送電装置200は、電源装置210と、送電部220と、通信部230とを含む。
図3は、送電装置200から車両100への電力伝送時の等価回路図である。図3を参照して、送電装置200の送電部220は、共振コイル221と、キャパシタ222と、電磁誘導コイル223とを含む。
f2=1/{2π(Lr×C2)1/2} … (2)
ここで、インダクタンスLrおよびキャパシタンスC1,C2を固定して、インダクタンスLtのみを変化させた場合において、第2コイル93および第3コイル96の固有周波数のズレと電力伝送効率との関係を図5に示す。なお、このシミュレーションにおいては、共振コイル94および共振コイル99の相対的な位置関係は固定とし、さらに、第2コイル93に供給される電流の周波数は一定である。
図5から明らかなように、固有周波数のズレ(%)が0%の場合には、電力伝送効率は100%近くとなる。固有周波数のズレ(%)が±5%の場合には、電力伝送効率は40%程度となる。固有周波数のズレ(%)が±10%の場合には、電力伝送効率は10%程度となる。固有周波数のズレ(%)が±15%の場合には、電力伝送効率は5%程度となる。すなわち、固有周波数のズレ(%)の絶対値(固有周波数の差)が、第3コイル96の固有周波数の10%以下の範囲となるように第2コイル93および第3コイル96の固有周波数を設定することで、電力伝送効率を実用的なレベルに高めることができることがわかる。さらに、固有周波数のズレ(%)の絶対値が第3コイル96の固有周波数の5%以下となるように第2コイル93および第3コイル96の固有周波数を設定すると、電力伝送効率をさらに高めることができるのでより好ましい。なお、シミュレーションソフトしては、電磁界解析ソフトウェア(JMAG(登録商標):株式会社JSOL製)を採用している。
上述のように、車両外部からの電力を用いて蓄電装置を充電する際には、蓄電装置の充電状態によって充電電力が変化される場合がある。
実施の形態1においては、充電電力の切換えや蓄電装置の充電状態の変化に伴う蓄電装置のインピーダンス変動を、車両側のインピーダンス調整部(DC/DCコンバータ,整合器)によって調整する場合について説明した。
Claims (15)
- 送電装置からの電力を非接触で受電する受電部と、
前記受電部で受電した電力を蓄える蓄電装置と、
前記受電部と前記蓄電装置との間に電気的に接続され、前記受電部と前記蓄電装置との間のインピーダンスを調整するためのインピーダンス調整部とを備え、
前記インピーダンス調整部は、前記送電装置から前記受電部への電力伝送状態に応じて、インピーダンスの調整状態を第1の調整状態と第2の調整状態との間で切換えるように構成され、
前記第1の調整状態においては、前記受電部で受電した電力はインピーダンス調整がされない状態で前記蓄電装置へ供給され、
前記第2の調整状態においては、前記受電部で受電した電力はインピーダンス調整がされた状態で前記蓄電装置へ供給され、
前記インピーダンス調整部を制御するための制御装置をさらに備え、
前記制御装置は、車両に設けられた前記受電部を前記送電装置に位置合わせする場合に前記受電部に前記送電装置からの電力を受電するときには、前記インピーダンス調整部を前記第1の調整状態とし、前記位置合わせが完了した後に、前記蓄電装置へ充電を行なうために前記受電部に前記送電装置からの電力を受電する場合には、前記送電装置から前記受電部への電力伝送状態に応じて、前記第1の調整状態と前記第2の調整状態とを切換える、車両。 - 前記制御装置は、前記蓄電装置へ供給する充電電力の大きさに応じて、前記第1の調整状態と前記第2の調整状態とを切換える、請求項1に記載の車両。
- 前記制御装置は、前記蓄電装置の充電状態に応じて、第1の充電電力および前記第1の充電電力よりも小さい第2の充電電力を用いて前記蓄電装置を充電し、
前記制御装置は、前記第1の充電電力を用いる場合には前記インピーダンス調整部を前記第1の調整状態に切換え、前記第2の充電電力を用いる場合には前記インピーダンス調整部を前記第2の調整状態に切換える、請求項2に記載の車両。 - 前記制御装置は、前記送電装置と前記受電部との間の電力伝送効率に応じて、前記第1の調整状態と前記第2の調整状態とを切換える、請求項1に記載の車両。
- 前記制御装置は、前記第1の調整状態で電力が伝達されている際に前記電力伝送効率が予め定められたしきい値を下回った場合には、前記インピーダンス調整部を前記第1の調整状態から前記第2の調整状態へ切換える、請求項4に記載の車両。
- 前記受電部で受電した電力を整流するための整流装置をさらに備え、
前記インピーダンス調整部は、前記整流装置からの電圧を変換して前記蓄電装置へ供給するためのDC/DCコンバータを含む、請求項1に記載の車両。 - 前記受電部で受電した電力を整流するための整流装置をさらに備え、
前記インピーダンス調整部は、前記受電部と前記整流装置との間に設けられ、コイルおよびコンデンサの少なくとも一方を含んで構成される整合器を有する、請求項1に記載の車両。 - 前記インピーダンス調整部は、前記第1の調整状態と前記第2の調整状態とを切換えるための切換部を含む、請求項1に記載の車両。
- 前記切換部を制御するための制御装置をさらに備え、
前記制御装置は、前記切換部の切換状態と前記蓄電装置に供給される電力の状態とに基づいて、前記切換部の異常を判定する、請求項8に記載の車両。 - 前記送電装置は、電力を非接触で供給するための送電部を含み、
前記送電部の固有周波数と前記受電部の固有周波数との差は、前記送電部の固有周波数または前記受電部の固有周波数の±10%以下である、請求項1に記載の車両。 - 前記送電装置は、電力を非接触で供給するための送電部を含み、
前記送電部と前記受電部との結合係数は0.1以下である、請求項1に記載の車両。 - 前記送電装置は、電力を非接触で供給するための送電部を含み、
前記受電部は、前記受電部と前記送電部との間に形成される特定の周波数で振動する磁界、および、前記受電部と前記送電部との間に形成される特定の周波数で振動する電界の少なくとも一方を通じて、前記送電部から受電する、請求項1に記載の車両。 - 蓄電装置を有する車両の受電部に非接触で電力を供給する送電装置であって、
電源部と、
前記電源部からの電力を受電装置に非接触で供給する送電部と、
前記電源部と前記送電部との間に電気的に接続され、前記電源部と前記送電部との間のインピーダンスを調整するためのインピーダンス調整部とを備え、
前記インピーダンス調整部は、前記送電部から前記受電装置への電力伝送状態に応じて、インピーダンスの調整状態を第1の調整状態と第2の調整状態との間で切換えるように構成され、
前記インピーダンス調整部を制御するための制御装置をさらに備え、
前記制御装置は、前記送電部から前記受電部を経由して前記蓄電装置に充電を行なっている場合に前記送電部と前記受電部との間の電力伝送効率を監視し、前記電力伝送効率が許容値よりも小さくなった場合には前記送電部からの送電を停止するとともに、送電電力を下げたテスト送電を行なって、前記電力伝送効率が前記許容値以上となるように調整するために前記第1の調整状態と前記第2の調整状態とを切換える、送電装置。 - 前記制御装置は、前記テスト送電時に前記インピーダンス調整部の調整状態を切換えることによって前記電力伝送効率が前記許容値以上になった場合には、前記テスト送電を停止させた後に前記蓄電装置に充電を行なうための送電を再開する、請求項13に記載の送電装置。
- 前記第1の調整状態においては、前記電源部からの電力はインピーダンス調整がされない状態で前記送電部へ供給される、請求項13に記載の送電装置。
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