JP2012125112A - 無線電力伝送システム、送電装置、及び受電装置 - Google Patents
無線電力伝送システム、送電装置、及び受電装置 Download PDFInfo
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Abstract
【解決手段】電力を送電する送電部と送電する電力を調整する電力調整部と通信部とを備えた送電装置と、電力を受電する受電部と受電した電力を検出する電力検出部と受電した電力を蓄積する蓄電部と通信部とを備えた受電装置とを備えた無線電力伝送システムにおいて、送電電力と受電電力の比である電力の伝送効率と、蓄電残量に基づいて、送電電力を調整する。
【選択図】 図1
Description
以下、図面を用いて実施例を詳細に説明する。
送電装置200は、電力調整部203を初期設定し、送電部202から初期設定電力(P0)の無線送電を行う(S200)。受電装置100は初期設定電力(P0)を受電部102で受電する(S100)。そして、受電電力が最大となるように、制御部105の最大化制御部105aが受電部102を制御する(S101)。その後、電力検出部103で受電電力を検出し(S102)、制御部105の適応制御部105bで蓄電部104の蓄電残量を検出する(S103)。そして、検出した受電電力と蓄電残量に関する情報を通信部106で送電装置200に送信する(S104)。
但し、X(W)は常数
本実施例によれば、システムが正常状態にあってかつ無線電力伝送条件が刻々と変化するような環境下でも、伝送効率に応じて送電電力の大きさを遂次更新し、常に最適な電力伝送を行うので、システム全体としては平均的に見て効率の良い電力伝送を実現することができる。
図5は、本実施例の送電装置と受電装置の処理を説明するフローチャートの例である。なお、受電電力最大化に関する構成とフローは実施例1と同一のため説明を省略する。(以下の各実施例でも同じ)
送電装置200は、電力調整部203を初期設定し、送電部202から初期設定送電を行う(S200)。受電装置100は初期設定送電S200を受電部102で受電し(S100)、受電電力が最大となるように、制御部105が受電部102を制御する(S101)。その後、電力検出部103で受電電力を検出する(S102)。そして、制御部105で蓄電部104の蓄電残量を検出し(S103)、検出した受電電力と蓄電残量に関する情報を通信部106で送電装置200に送信する(S104)。
なお、受電電力検出S102と蓄電残量検出S103はどちらを先に実施しても良い。
図6Aの(A)は高い伝送効率の発生確率が高い場合の送電電力の設定例、(B)は低い伝送効率の発生確率が高い場合の送電電力の設定例を示している。図6Bの(A)は、図6Aの(A)に対応するもので、高い伝送効率の発生確率が高い場合の一例として、受電装置100が送電装置200から近い範囲100aを移動する例(100−1)を示している。図6Bの(B)は図6Aの(B)に対応するもので、低い伝送効率の発生確率が高い場合の一例として、受電装置100が送電装置200から遠い範囲100bを移動する例(100−2)を示している。
図8の(A)は消費電力が大きい時の送電電力の設定例を示している。図8の(B)は消費電力が小さい時の送電電力の設定例を示している。どちらにおいても、伝送効率が高いほど、蓄電残量が低いほど、送電電力は高く設定されるが、消費電力の大きい時は消費電力の小さい時よりも送電電力を大きめに設定する。例えば、蓄電残量が30%で伝送効率が70%の場合、消費電力が大きい時は8W、消費電力が小さい時は6Wなどと設定する。また、図8では消費電力は2段階の設定になっているが、多段階や無段階に設定しても良い。また、消費電力は瞬時的な値を制御に用いるのではなく、ある時間の平均値を用いるなどしても良い。その際、消費電力の平均値は、受電装置で算出しても良いし、送電装置で算出しても良い。また、消費電力は蓄電残量と受電電力の履歴から算出しても良い。所定の時間における蓄電残量の変動量と受電電力の積分値の和が消費電力の積分値となる。
まず、図12Aは、本発明の第5の実施例における、無線電力伝送システムの装置構成の概略を示す外観斜視図である。
無線電力伝送システム1000を構成する、送電装置600と受電装置500と残存電力検出装置710は、いずれも無線電力伝送空間700として機能する電力伝送媒体702の上面(もしくは側面)に接続される。送電装置600は電力伝送媒体702を介して受電装置500に電力を伝送する。そして、残存電力検出装置710は電力伝送媒体702内に残存している電力を検出する。
図13の受電装置500及び送電装置600のうち、既に説明した図1に示された同一の符号を付された構成と、同一の機能を有する部分については、説明を省略する。
送電装置600は、電力調整部203を初期設定し、送電部202から初期設定送電を行う(S200)。受電装置500は初期設定送電S200を受電部102で受電する(S100)。同様に、残存電力検出装置710は受電部712で電力伝送媒体702内に残存している電力を受電し、電力検出部713で電力レベルを検出する(S700)。
図16の受電装置800及び送電装置900のうち、既に説明した図1に示された同一の符号を付された構成と、同一の機能を有する部分については、説明を省略する。また、受電装置800と受電装置810は同一構成であるため、受電装置810の説明を省略する。また、残存電力検出装置710は図13において既に説明したため、説明を省略する。
送電装置900は、電力調整部203を初期設定し、送電部202から初期設定送電(P0)を行う(S200)。受電装置800は初期設定送電S200を受電部102で受電する(S100a)。同様に、受電装置810も受電する(S100b)。また、残存電力検出装置710は受電部712で電力伝送媒体702内に残存している電力Pxを受電し、電力検出部713で電力レベルを検出する(S700)。
100a、100b 受電装置の移動範囲、
101、711 受電アンテナ、
102、712 受電部、
103、713 電力検出部、
104 蓄電部、
105、204、301、401、501、601、714、802、901 制御部、
105a 最大化制御部、
105b 適応制御部、
106、206、303、402、502、602、715、803、902 通信部、
107、207、716 通信アンテナ、
200、400、600、900 送電装置、
201 送電アンテナ、
202 送電部、
203 電力調整部、
204 制御部、
204a 適応制御部、
205、302 記憶部、
700 無線電力伝送空間、
702 電力伝送媒体、
710 残存電力検出装置、
801 受電スイッチ、
1000 無線電力伝送システム。
Claims (20)
- 送電装置と受電装置との間で無線により電力を伝送する無線電力伝送システムであって、
前記送電装置は、電力を送電する送電部と、前記送電する電力を調整する電力調整部とを有しており、
前記受電装置は、前記電力を受電する受電部と、前記送電装置から受電した電力を蓄積する蓄電部とを有しており、
前記送電装置と前記受電装置間における前記電力の伝送効率と、前記蓄電部の蓄電残量とに基づいて、前記送電装置からの送電電力の大きさを調整する機能を有する
ことを特徴とする無線電力伝送システム。 - 請求項1において、
前記伝送効率が高いほど前記送電電力を高く設定し、前記蓄電残量が高いほど、前記送電電力を低く設定する
ことを特徴とする無線電力伝送システム。 - 請求項2において、
前記伝送効率は、前記伝送効率の履歴に基づいて算出され、
前記伝送効率の履歴において高い伝送効率の発生確率が高いほど、前記送電電力を大きくする閾値が高くなるように、前記送電電力を調整する
ことを特徴とする無線電力伝送システム。 - 請求項2において、
前記受電装置の消費電力を算出し、
前記消費電力の大きい時は該消費電力の小さい時よりも前記送電電力が大きくなるように、前記送電装置からの前記送電電力を調整する
ことを特徴とする無線電力伝送システム。 - 請求項1において、
電力を伝送する電力伝送媒体と、
前記電力伝送媒体内の残存電力を検出する残存電力検出部とを備え、
前記電力伝送媒体は、誘電体と、該誘電体を挟んでその上下両面に形成された一対の導体からなり、
前記電力伝送媒体を介して前記送電装置から前記受電装置へ電力を伝送し、
前記残存電力検出部で前記電力伝送媒体内の残存電力を検出し、
前記電力伝送媒体内の残存電力と前記蓄電部の蓄電残量とに基づき、前記電力の伝送効率を算出する
ことを特徴とする無線電力伝送システム。 - 請求項5において、
前記受電装置は受電量の調整部を備え、
前記電力の伝送効率と、前記蓄電残量に基づいて、前記受電量の調整部を制御する
ことを特徴とする無線電力伝送システム。 - 請求項1において、
前記送電電力の大きさの調整は送電信号の振幅の調整、もしくは送電時間の調整によって行う
ことを特徴とする無線電力伝送システム。 - 請求項1において、
前記受電装置から受電電力を前記送電装置に送信し、該送電装置で前記伝送効率を算出する
ことを特徴とする無線電力伝送システム。 - 請求項1において、
前記送電装置から送電電力を前記受電装置に送信し、該受電装置で前記伝送効率を算出する
ことを特徴とする無線電力伝送システム。 - 請求項5において、
前記電力伝送媒体の端面で前記一対の導体が短絡または開放しており、
前記残存電力検出装置は、前記電力伝送媒体上の複数の箇所に設置され、
前記複数の残存電力検出装置の配置間隔は、前記電力の伝送に用いる周波数の前記電力伝送媒体内での波長の4分の1である
ことを特徴とする無線電力伝送システム。 - 請求項5において、
前記電力伝送媒体はその端面で電力が反射しない構成を有しており、
前記残存電力検出装置は前記電力伝送媒体の1箇所に設置されている
ことを特徴とする無線電力伝送システム。 - 請求項5において、
前記電力伝送媒体に、少なくとも1つの前記送電装置と、複数の前記受電装置と、少なくとも1つの前記残存電力検出装置とが接続され、
前記電力伝送媒体内の残存電力と前記受電装置の前記各蓄電部の蓄電残量とに基づき、前記各受電装置における前記電力の伝送効率を算出及び送電電力が算出される
ことを特徴とする無線電力伝送システム。 - 無線により受電装置に電力を送電する送電部と、
該送電する電力を調整する電力調整部と、
無線により前記受電装置と通信する通信部と、
制御部とを備え、
前記受電装置から、送電受電電力及び蓄電残量の情報を取得し、
送電した電力の伝送効率を算出し、該伝送効率と前記電残量に基づいて、
前記送電電力の大きさを調整する
ことを特徴とする送電装置。 - 請求項13において、
前記伝送効率が高いほど前記送電電力を高く設定し、前記蓄電残量が高いほど、前記送電電力を低く設定する
ことを特徴とする送電装置。 - 請求項14において、
前記伝送効率は、前記伝送効率の履歴に基づいて算出され、
前記伝送効率の履歴において、高い伝送効率の発生確率が高いほど、前記送電電力を大きくする閾値が高くなるように、前記送電電力を調整する
ことを特徴とする送電装置。 - 請求項14において、
電力を伝送する電力伝送媒体に接続され、
前記電力伝送媒体は、誘電体と、該誘電体を挟んでその上下両面に形成された一対の導体からなり、
前記電力伝送媒体を介して前記送電装置から前記受電装置へ電力を伝送し、
前記電力伝送媒体内の残存電力の情報と前記蓄電部の蓄電残量とに基づき、前記電力の伝送効率を算出する
ことを特徴とする送電装置。 - 請求項16において、
前記電力の伝送効率と、前記蓄電残量に基づいて、前記受電装置に受電制御を指示し、前記送電電力を調整する
ことを特徴とする送電装置。 - 無線により送電装置から電力を受電する受電部と、
受電した電力を検出する電力検出部と、
受電した電力を蓄積する蓄電部と、
無線により前記送電装置と通信する通信部と、
制御部とを備え、
前記送電装置から受電制御の指示を受け、該受電制御を行い、
前記送電装置から送電された電力と前記受電部で受電した電力との比である前記電力の伝送効率と、前記蓄電部の蓄電残量とに基づいて、受電量の調整を行う
ことを特徴とする受電装置。 - 請求項18において、
前記送電装置から受信した前記電力の伝送効率と、前記蓄電部の蓄電残量とに基づいて、要求電力を設定し、
前記送電装置に前記要求電力を送信する
ことを特徴とする受電装置。 - 請求項18において、
電力を伝送する電力伝送媒体に接続され、
前記電力伝送媒体は、誘電体と、該誘電体を挟んでその上下両面に形成された一対の導体からなり、
前記電力伝送媒体を介して前記送電装置からの電力を受信し、
前記電力伝送媒体内の残存電力の情報と前記蓄電部の蓄電残量とに基づき、前記電力の伝送効率を算出する
ことを特徴とする受電装置。
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US13/314,934 US8892033B2 (en) | 2010-12-10 | 2011-12-08 | Wireless power transmission system, transmitter, and receiver |
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WO2024162127A1 (ja) * | 2023-01-31 | 2024-08-08 | 京セラ株式会社 | 送電装置、送電方法及びプログラム |
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