JP2014103802A - 送電装置および電力伝送システム - Google Patents
送電装置および電力伝送システム Download PDFInfo
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Abstract
【解決手段】送電装置は、車両に設けられた二次コイル20に非接触で電力を送電する送電装置であって、配列方向に間隔をあけて配置された複数の一次コイル51,53,55,57と、電源から電力から供給される一次コイル51,53,55,57を選択する選択部44と、選択部44を制御する制御部とを備え、制御部は、選択した一次コイル51,53,55,57に第1電力よりも小さい第2電力を供給させ、選択した一次コイル51,53,55,57の送電状況と二次コイル20の受電状況との少なくとも一方に基づいて複数の一次コイル51,53,55,57から送電コイルを選択し、送電コイルに第1電力を供給させる。
【選択図】図1
Description
(実施の形態1)
図1は、非接触送受電システムの一例を示す全体ブロック図である。車両11は、駆動源として回転電機を用いる電気自動車が例示されるが、非接触で受電するものであれば、他の自動車であってもよいし、さらに、受電対象は車両でなくてもよい。
図10から図13を用いて、本実施の形態2に係る送電装置、受電装置および電力伝送システムについて説明する。図10は、車両11と送電装置40とを模式的に示す平面図である。
図14から図16を用いて、本実施の形態3に係る送電装置、受電装置および電力伝送システムについて説明する。
(STEP216)。
(実施の形態4)
図18から図19を用いて、本実施の形態4に係る送電装置、受電装置、および電力伝送システムについて説明する。図18は、本実施の形態4に係る車両11と、送電装置40とを模式的に示す平面図である。
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、送電部193および受電部196の固有周波数のズレと、電力伝送効率との関係を図21に示す。なお、このシミュレーションにおいては、コイル194およびコイル199の相対的な位置関係は固定した状態であって、さらに、送電部193に供給される電流の周波数は一定である。
図21からも明らかなように、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%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%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%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、受電部196の固有周波数の10%以下の範囲となるように各送電部および受電部の固有周波数を設定することで電力伝送効率を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(%)の絶対値が受電部196の固有周波数の5%以下となるように、各送電部および受電部の固有周波数を設定することで電力伝送効率をより高めることができることがわかる。
図1において、選択され、直列接続された一次コイルには、電源部42から交流電力が供給される。この際、一次コイルを流れる交流電流の周波数が特定の周波数となるように電力が供給されている。
Claims (13)
- 車両に設けられた二次コイルに非接触で電力を送電する送電装置であって、
配列方向に間隔をあけて配置された複数の一次コイルと、
電源から電力から供給される一次コイルを選択する選択部と、
前記選択部を制御する制御部と
を備え
前記制御部は、選択した一次コイルに第1電力よりも小さい第2電力を供給させ、選択した一次コイルの送電状況と前記二次コイルの受電状況との少なくとも一方に基づいて前記複数の一次コイルから送電コイルを選択し、前記送電コイルに前記第1電力を供給させる、送電装置。 - 前記制御部は、前記車両の進入方向を検知し、
前記制御部は、前記複数の一次コイルのうち前記進入方向の上流側の端部に位置する一次コイルの上方を前記二次コイルが通過する前に、前記送電コイルを選択する制御を開始し、
前記制御部は、前記送電コイルを選択する制御の開始時に、前記複数の一次コイルのうち前記進入方向の上流側の端部に位置する一次コイルを選択し、前記一次コイルの移動に応じて、選択する一次コイルを変更する、請求項1に記載の送電装置。 - 前記制御部は、前記車両から受信した情報に基づいて前記車両の進入方向を検知する、請求項2に記載の送電装置。
- 前記複数の一次コイルは、前記配列方向の一方端に位置する第1端部コイルと、他方端に位置する第2端部コイルとを含み、
前記制御部は、前記第1端部コイルと前記第2端部コイルとを交互に選択し、前記第1端部コイルと前記二次コイルとの間の受電効率と、前記第2端部コイルと前記二次コイルとの間の受電効率とを比較した結果に基づいて、前記車両の進入方向を検知する、請求項2に記載の送電装置。 - 前記受電状況とは、前記二次コイルの受電効率であり、
前記制御部は、選択された一次コイルと前記二次コイルとの間の受電効率が第1閾値よりも小さくなると、前記選択された一次コイルに対して前記進入方向に隣り合う一次コイルを選択する、請求項2から請求項4のいずれかに記載の送電装置。 - 前記複数の一次コイルは、前記配列方向の中央に位置する中央コイルを含み、
前記制御部は、前記送電コイルを選択する制御の開始時に前記中央コイルを選択し、前記中央コイルを選択した後に、前記二次コイルの位置に応じて一次コイルを選択する、請求項1に記載の送電装置。 - 前記制御部は、前記車両から入力される情報に基づいて、前記中央コイルから前記二次コイルに向かう選択方向を設定し、
前記制御部は、選択した一次コイルに第2電力を供給したときの第1受電効率を検知し、
前記制御部は、前記選択された一次コイルに対して前記選択方向に隣り合う隣接コイルに第2電力を供給したときの第2受電効率を検知し、
前記制御部は、前記第1受電効率の方が前記第2受電効率よりも高く、前記第1受電効率が第2閾値よりも高い場合には、前記選択された一次コイルを送電コイルとする、請求項6に記載の送電装置。 - 前記制御部は、前記送電コイルに第1電力を供給した後、送電条件を満たさないと判断すると、前記送電への電力供給を停止し、前記送電とは別の一次コイルを送電コイルに選択する、請求項1に記載の送電装置。
- 各前記一次コイルの温度を検知する測温部をさらに備え、
前記制御部は、前記送電コイルの温度が第3閾値を超えると、送電条件を満たさないと判断する、請求項8に記載の送電装置。 - 前記制御部は、前記送電コイルに対して前記配列方向に隣り合う一次コイルに第2電力を供給し、前記配列方向に隣り合う一次コイルに第2電力を供給したときの前記二次コイルの受電効率が第4閾値よりも大きいときに、前記隣り合う一次コイルを前記送電コイルに選択する、請求項9に記載の送電装置。
- 前記選択された一次コイルと前記二次コイルとの間の距離を検知する検知部をさらに備え、
前記制御部は、前記検知部からの出力に基づいて、前記選択された一次コイルと前記二次コイルとの間の距離が予め定められた範囲よりも大きいまたは小さいと判断すると、前記送電条件を満たさないと判断する、請求項8に記載の送電装置。 - 前記制御部は、前記選択された一次コイルに対して隣り合う一次コイルと前記二次コイルと間の受電効率が所定値以上のときに、前記選択された一次コイルと隣り合う一次コイルを第2選択コイルに選択する、請求項11に記載の送電装置。
- 車両に設けられた二次コイルを含む受電装置と、前記二次コイルにに非接触で電力を送電する電力伝送システムであって、
配列方向に間隔をあけて配置された複数の一次コイルと、
電源から電力から供給される一次コイルを選択する選択部と、
前記選択部を制御する制御部と
を備え
前記制御部は、選択した一次コイルに第1電力よりも小さい第2電力を供給させ、選択した一次コイルの送電状況と前記二次コイルの受電状況との少なくとも一方に基づいて前記複数の一次コイルから送電コイルを選択し、前記送電コイルに前記第1電力を供給させる、電力伝送システム。
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