TW201541792A - 無線電力傳輸器及其傳輸方法 - Google Patents

無線電力傳輸器及其傳輸方法 Download PDF

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TW201541792A
TW201541792A TW104114996A TW104114996A TW201541792A TW 201541792 A TW201541792 A TW 201541792A TW 104114996 A TW104114996 A TW 104114996A TW 104114996 A TW104114996 A TW 104114996A TW 201541792 A TW201541792 A TW 201541792A
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wireless power
transmission
unit
resonance
power
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TWI637577B (zh
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Su-Ho Bae
Ki-Min Lee
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Lg Innotek Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/50Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
    • H02J50/502Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices the energy repeater being integrated together with the emitter or the receiver
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B5/00Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24Inductive coupling
    • H04B5/26Inductive coupling using coils
    • H04B5/263Multiple coils at either side
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B5/00Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

本發明係一無線電力傳輸器及其傳輸方法。該無線電力傳輸器包括:複數個傳輸共振單元,一偵測電力施加單元,施加偵測電力至該傳輸共振單元以偵測無線電力接收器的位置,以及一電流量測單元,根據外加偵測電流量測產生自該無線電力傳輸器一內部的電流。該無線電力傳輸器根據所測得的電流,透過至少一個與該無線電力接收器位置對應的傳輸共振單元以傳輸電力。

Description

無線電力傳輸器及其傳輸方法
本發明係主張關於2011年11月02日申請之韓國專利案號No.10-2011-0113288之優先權,藉以引用的方式併入本文用作參考。
本發明係關於一種無線電力傳輸技術。特別的是,本發明係關於一種藉由使用一共振現象以有效傳輸能量之一無線電力傳輸器及其傳輸方法。
無線電力傳輸器或無線能量轉移係指以無線方式轉移電能至預定設備的一種技術。在十九世紀,使用電磁感應理論的電動馬達或變壓器已被廣泛使用,接著藉由輻射電磁波以傳輸電能的方法已被採用,如:無線電波或雷射。現實生活中,經常使用在日常生活中的電動牙刷或電動刮鬍刀等,其係根據電磁感應的理論做充電。直到現在,使用磁感應做長距離傳輸、共振與無線電短波頻率已成為無線能量轉移的方法。
至於近來被關注的短距離無線電力傳輸,其係指一無線電力傳輸器安裝在一建築物內,當使用者在建築物中使用一移動裝置,如一行動電話或一筆記型電腦,即使該移動裝置不額外連接一電源線,亦可連續充電。
然而,根據目前相關的無線電力傳輸技術,不論無線電力接收器是否存在,電力必須連續的傳輸,如此將造成電力的浪費以及對人體的傷害。
本發明提供一種無線電力傳輸器及其傳輸方法,其可以藉由共振現象傳輸能量。
此外,本發明提供一種具有偵測無線電力接收器位置之能力的無線電力傳輸器及其傳輸方法。
再者,本發明提供一種可以透過對應無線電力接收器之位置的一特定傳輸共振單元以傳輸能量。
根據實施例,其提供一種無線電力傳輸器,藉由共振效應以無線方式傳輸電力至一無線電力接收器。該無線電力傳輸器包括複數個傳輸共振單元,一偵測電力施加單元,其係施加偵測電力至該些傳輸共振單元以偵測該無線電力接收器的位置,以及一電流量測單元用來量測根據施加偵測電力而產生於該無線電力傳輸器內部之電流。該無線電力傳輸器根據該所量測的電流,透過至少一個傳輸共振單元以傳輸電力,其中的傳輸共振單元對應該無線電力接收器的位置。
根據實施例,其提供一種無線電力傳輸器的傳輸方法,其藉由使用共振效應以無線傳輸電力至一無線電力接收器。該電力傳輸方法包括:施加偵測電力至複數個傳輸共振單元;根據該偵測電力,量測產生於無線電力傳輸內部的電流;根據該量測電流,決定至少一對應該無線電力接收器位置的傳輸共振單元;以及透過該至少一被決定的傳輸共振單元傳輸電力。
根據發明實施例,該無線電力傳輸器透過對應該無線電力接收器位置的共振單元傳輸能量,因此可以增進傳輸效率。
此外,該無線電力傳輸器透過特定的傳輸共振單元以集中能量傳輸,因此可防止能量的浪費,以及減少磁場對人體的傷害。
同時,在以下說明中,本發明實施例將直接或間接接露其他各種不同的功效。
10‧‧‧電源
11‧‧‧電源供應單元
12‧‧‧外加電力偵測單元
13‧‧‧電流量測單元
14‧‧‧開關單元
15‧‧‧控制器
21‧‧‧傳輸線圈單元
22‧‧‧傳輸共振線圈單元
22a‧‧‧電容器
25‧‧‧墊片
30‧‧‧電力接收單元
31‧‧‧接收共振線圈單元
32‧‧‧接收線圈單元
40‧‧‧整流電路
50‧‧‧負載
60‧‧‧無線功率接收器
100‧‧‧無線電力傳輸器
C1、C2、C3‧‧‧電容器
C4、C5‧‧‧電容器
D1‧‧‧二極體
L1、L2‧‧‧電感器
L3、L4‧‧‧電感器
S101~S111‧‧‧步驟
圖1繪示根據本發明實施例之一無線電力傳輸系統的視圖;圖2繪示根據本發明實施例之一傳輸線圈單元的等效電路圖;圖3繪示根據一實施例之一電源以及一傳輸單元的等效電路圖;圖4繪示根據本發明實施例之一接收共振線圈、一接收共振單元、一平流電路(smoothing circuit)、以及一負載的等效電路圖;圖5繪示根據本發明實施例之一無線電力傳輸器的結構圖;以及圖6繪示根據本發明實施例之一電力傳輸方法的流程圖。
在以下說明當中,如果對於習知的功能或架構之說明可能造成對本發明主題的不清楚,則其細節說明將與以省略。此外,根據本發明實施例,所描述的術語根據各部件功能而定義,並且其可以根據一使用者的目的或依操作者以及客戶而有意義上的差異。因此,該術語將依據本說明書全文而定義。
下文中,實施例將根據配合圖示進行說明。
圖1繪示根據本發明實施例之一無線電力傳輸系統的視圖。
參考圖1,該無線電力傳輸系統包括一電源10、一電力傳輸單元20、一電力接收單元30、一整流電路40、以及一負載50。
產生自該電源10的電力被提供至電力傳輸單元20,以使得電力傳輸單元20使用共振效應將電力傳輸至電力接收單元30,其與電力傳輸單元20相共振,並與電力傳輸單元20具有相同的共振頻率值。轉移至電力接收單元30的電力經由整流電路40後轉移到負載50。負載50可以是一電池或一需要電力的預定設備。
詳細的說,電源10係一交流電源,以提供一預定頻率的交流電。
電力傳輸單元20包括:一傳輸線圈單元21以及一傳輸共振線圈單元22。傳輸線圈單元21與電源10連接,以使得交流電流流過傳輸線圈單元21。當交流電流流過傳輸線圈單元21時,由於電磁感應之故,該交流電流被感應到與傳輸線圈單元21實體分離的傳輸共振線圈單元22。轉 移到傳輸共振線圈單元22的電力係使用共振效應而傳輸至電力接收單元30,其與電力傳輸單元20形成一共振電路。
根據使用共振效應之電力傳輸,電力可被傳輸於兩個阻抗相匹配的LC電路之間。相較於使用電磁感應傳輸電力的方法,使用共振效應傳輸電力的方法傳輸距離可更遠且傳輸效率更高。
電力接收單元30包括一接收共振線圈單元31以及一接收線圈單元32。來自傳輸共振線圈單元22的電力被接收共振線圈單元31所接收,使得交流電流流過接收共振線圈單元31。傳輸到接收共振線圈單元31的電力,藉由電磁感應轉移至接收線圈單元32。轉移至接收線圈32的電力,再透過整流電路40而轉移到負載50。
圖2繪示根據本發明實施例之一傳輸線圈單元的等效電路圖。如圖2所示,傳輸線圈單元21可包括一電感器L1以及一電容器C1,且形成具有適當電感值與電容值的一電路。
電容器C1可以是一固定電容或一可變電容。當電容器C1係可變電容時,電力傳輸單元20可以控制該可變電容以使阻抗達到匹配。在此同時,傳輸共振線圈單元22、接收共振線圈單元31、以及接收線圈單元32的等效電路可如圖2所示。
圖3繪示根據一實施例之一電源10以及一電力傳輸單元20的等效電路圖。如圖3所示,每一傳輸線圈單元21和傳輸共振線圈部22可包括一電感器L1或L2以及一電容器C1或C2,其分別具有一預定的電感值以及一預定的電容值。
特別是,傳輸共振線圈單元22的電容器C2可以是一個可變電容,且電力傳輸單元20可調整該可變電容以調整共振頻率值產生共振效應。
圖4繪示根據實施例之該接收共振線圈單元31、該接收線圈單元32、一整流電路40以及該負載50的等效電路圖。如圖4所示,每一個傳輸共振線圈單元22以及接收線圈部32可包括一電感L3或L4以及一電容C3或C4,其分別具有一預定的電感值以及一預定的電容值。
整流單元40可包括:一二極體D1以及一整流電容C5,使 得整流單元40將交流電轉換為直流電並輸出。雖然負載50標示為1.3V直流電,但負載50可以係一電池或其他需要直流電的設備。
下文中,根據本發明實施例,一透過與無線電力接收器位置相對應的傳輸共振單元以傳輸能量之無線電力傳輸器100及其傳輸方法將進行詳細說明。
圖5繪示根據本發明實施例之一無線電力傳輸器100的結構圖。
參考圖5,無線傳輸器100可包括:一電源供應單元11、一外加電力偵測單元12、一電流量測單元13、一開關單元14、一控制器15、複數個傳輸共振單元20以及一墊片(pad)25。根據本實施例,傳輸共振單元20可以在墊片25上以二維(2D)方式排列。根據一實施例,傳輸共振單元20可以在墊片25上以二維方式排列,所以傳輸共振單元20可以一矩陣(matrix)的形式排列。
在此同時,如圖5,每一傳輸共振單元20可與如圖1的電力傳輸單元相對應,以及除了傳輸共振單元20之外的部件,可包括如圖1的電源10。
該些傳輸共振單元20對應複數個共振頻率。傳輸共振單元可有相同的共振頻率,或可有不同的共振頻率。
此外,部份的傳輸共振單元20可有第一共振頻率,而其餘的傳輸共振單元20可有第二共振頻率。在本例中,第一共振頻率與第二共振頻率不同。
墊片25可有一矩形外形,但本發明並非限定於此。
如果一無線電力接收器60放置在墊片25上,無線電力傳輸器100可透過在墊片25上的多個傳輸共振單元中的一特定傳輸共振單元傳輸能量至無線電力接收單元60。在本例中,無線電力接收單元60可包括功率接收單元30、整流電路40,以及負載50,其可參考圖1說明,並且其可被安裝在一例如可攜式終端設備的電子裝置。
電源供應單元11產生一具有特定頻率用以作為能量傳輸之用的交流電,且該交流電可以透過開關單元14而傳輸至傳輸共振單元20。
外加電力偵測單元12可產生用於偵測無線功率接收器60之位置的偵測電力,並且提供該偵測電力至開關單元14。根據一實施例,該偵測電力可以是一微電力(micro-power)用以偵測提供在墊片25上的無線電力接收器60。在本例中,如果該些傳輸共振單元20均具有相同的共振頻率,該偵測電力可以是具有與共振頻率相同頻率的交流電。
電流量測單元13藉由該偵測電力以量測產生於無線電力傳輸器100的內部電流,且該量測電流可供應至控制器15。在本例中,控制器15可以根據該量測電流來偵測無線電力接收器60的位置。
下文中,將說明控制器15根據該量測電流來偵測無線電力接收器60之位置的原理。
在以下說明中,假設包含在每一傳輸共振單元20內的一傳輸共振線圈單元22,由於電感與電容部件相互並聯而產生一自我共振頻率(self resonant frequency)f1,以及該些傳輸共振單元20具有相同的自我共振頻率f1。
如果具有共振頻率f1的偵測電力被外加至每一傳輸共振單元20,因為每一傳輸共振單元20的電感器與電容器在自我共振頻率f1之下成開路狀態,使得在無線電力傳輸器100量測到電流將減至最小,所以阻抗最大。
如果無線電力接收器60接近傳輸共振單元20,傳輸共振單元的電感部件L1,以及無線電力接收器的電感部件L2相互耦合,其形成的互感分量(mutual inductance component),如以下方程式1所定義。
在方程式1中,k代表一耦合係數,L1代表與無線電力接收器60位置相對應的傳輸共振單元20其所形成的自感(self inductance),以及L2代表無線電力接收器60的自感。
產生於對應無線電力接收器60之位置的傳輸共振單元20與無線電力接收器60之間的互感分量M改變傳輸共振單元20的自我共振 頻率f1,而改變後的自我共振頻率稱之為一互變共振頻率(mutual-change resonant frequency)f2。
換言之,如果無線電力接收器60配置在一特定傳輸共振單元20上,該互變共振頻率f2係指該特定傳輸共振單元20和無線電力接收器60之間所改變的共振頻率。
對應無線電力接收器60之位置的傳輸共振單元20其電感器及電容器在互變共振頻率f2下不會有最大阻抗值。因此,如果具有自我共振頻率f1的偵測電力被施加至接近無線電力接收器60的傳輸共振單元20上,則在無線電力傳輸器100上所量測到的電流將會增加。
此外,隨著無線電力接收器60愈來愈接近該特定的傳輸共振單元20,互變共振頻率f2或在無線電力傳輸器100之量測電流逐漸增加。控制器15根據在互變共振頻率f2的變化或電流來判斷無線電力接收器60是否接近該特定的傳輸共振單元20。
開關單元14執行一切換動作以連續供應接收來自外加偵測電力單元12之偵測電力至傳輸共振單元20,換言之,開關單元14根據控制器15的控制,依續供應該偵測電力至該些傳輸共振單元20,使得無線電力接收器60的位置得以被偵測。
此外,開關單元14可執行切換操作,在此方式下,產生自電源供應單元11的電力被供應到該特定傳輸共振單元20。換言之,開關單元14執行切換操作,在此方式下,電力被供應到對應無線電力接收器60之位置的特定傳輸共振單元20,而不會供應至其餘的傳輸共振單元20。
該些傳輸共振單元20可以一柵格(lattice)或一矩陣(matrix)的方式排列在墊片25上。換言之,該些傳輸共振單元20可以上述方式排列,使得墊片25的區域被分隔成複數個均勻的區域。
此外,該些傳輸共振單元20均具有相同的外型與相同的尺寸,但本發明並非限定於此。同時,根據本發明實施例,雖然總共有12個傳輸共振單元20被以柵格的形式提供,但本發明並非限定於此。
此外,每一傳輸共振單元20包括一傳輸線圈單元21以及一傳輸共振線圈單元22。
傳輸線圈單元21與開關單元14連接,並有一交流電流流入其中而產生一磁場。此外,傳輸線圈單元21透過電磁感應現象,傳輸磁場至與傳輸線圈單元21實體分離的傳輸共振線圈單元22。
如果傳輸共振線圈單元22接收來自傳輸線圈單元21的磁場,交流電將被感應到傳輸共振線圈單元22。此外,傳輸線圈單元21透過共振現象供應其所儲存的能源至無線電力接收器60。在本例中,為了藉由共振達到無線電力傳輸的目的,傳輸共振線圈單元22的自我共振頻率必須與在無線電力接收器60所提供的接收共振線圈單元(未繪示)之自我共振頻率相匹配。
傳輸共振線圈單元22包括一電容器22a,且該電容器22a可以是一固定電容的電容器或是一具有可變電容的電容器。
如果傳輸共振線圈單元22為一可變電容器,控制器15可藉由改變傳輸共振線圈單元22的電容器22a的電容以調整共振頻率。
舉例而言,在假設無線電力接收器60具有一固定自我共振頻率的情況下,無線電力傳輸器100可調整傳輸共振線圈單元22的可變電容器22a的電容值,以使其共振頻率和無線電力接收器60的共振頻率相等。在本例中,控制器15可先儲存無線電力接收器60的共振頻率之相關資訊。
同時,如果傳輸共振線圈單元22的電容器22a為一固定電容器,該電容器22a的電容值可以被預設至傳輸共振線圈單元22的共振頻率等於無線電力接收器60的共振頻率之範圍。
控制器15可以控制無線電力傳輸器100所有的操作。
控制器15可以執行一控制操作,透過對應在墊片25上之無線電力接收器60位置的特定傳輸共振單元20傳輸電力至無線電力接收器60。
舉例而言,如圖5所示,該些傳輸共振單元20可排列成三列(row)四行(column)的3x4矩陣形式,且無線電力接收器60可配置在第二列第一行、第二列第二行、第三列第一行以及第三列第二行內的傳輸共振單元20上。
在本例中,控制器15控制開關單元14,僅透過配置在位置在第二列第一行、第二列第二行、第三列第一行以及第三列第二行的傳輸共振單元20,來傳輸電力至該無線電力接收器60。
此外,控制器15可執行控制操作,使得電力僅透過傳輸共振單元20傳輸到無線電力接收器60,其係被配置在第二列第二行的位置,並且其大部份與無線電力接收器60重疊。
透過上述程序,無線電力傳輸器100可透過對應無線電力接收器60之位置的傳輸共振單元20,集中能量傳輸至該無線電力接收器60。所以,可以防止不必要的電力耗損。
同時,控制器15可根據一檢測對照表(look-up table)格式的量測電流,預先儲存互變共振頻率值。透過該檢測對照表,控制器15可根據來自一電流量測單元13的偵測電流,偵測到該互變共振頻率f2,並可控制電力供應單元11,使得電力供應單元11產生具有互變共振頻率f2的交流電力。
此外,在監視來自電流量測單元13所提供的電流資訊期間,控制器15依序控制該些傳輸共振單元20。此外,控制器15可根據該電流資訊偵測在墊片25上之無線電力接收器60的位置。
舉例而言,控制器15透過開關單元14的控制,施加具有自我共振頻率f1的偵測電力至配置在第一列第一行的傳輸共振單元20。隨後,如果接收到來自電流量測單元13的電流資訊,控制器15確認無線電力接收器60存在於配置在第一列第一行的傳輸共振單元20上。
控制器15依序分別對每一傳輸共振單元20執行上述程序,以決定無線電力接收器60是否存在於配置有相關傳輸共振單元20之墊片25的區域上。
此外,控制器15可預先設定一閾值(threshold value),以判斷在對應該些傳輸共振單元20的所有區域中配置有無線電力接收器60的區域。如果無線電力接收器60位在複數個區域,則配置在所有區域的全部傳輸共振單元20的電流量變化可被偵測到。
控制器15可藉由設定閾值來判斷位在一區域的傳輸線圈單 元21與無線電力接收器是否大部分區域重疊。因此,只要接收自電流量測單元13的電流超過預設閾值,控制器15即可斷定無線電力接收器60位在相關的傳輸共振單元20上。
如果無線電力接收器60的位置被完全偵測到,控制器15透過對應無線電力接受器60之位置的傳輸共振單元20傳輸能量。換言之,控制器15透過開關單元14的控制,供應產生自電源供應單元11的交流電力至有關的傳輸共振單元20。
無線電力傳輸器100透過電源供應單元11產生具有互變共振頻率f2的交流電力,以透過對應無線電力接受器60之位置的傳輸共振單元20傳輸能量。換言之,該實際的能量傳輸係藉由互變共振頻f2來達成,而非自我共振頻率f1。在本例中,控制器15可控制電源供應單元11,以產生具有互變共振頻率f2的交流電力。
在此同時,根據本實施例,雖然無線電力傳輸器100係透過電流量的變化以偵測無線電力接收器60的位置,但本發明並非限定於此。換言之,無線電力傳輸器100可藉由使用一配置在墊片25的壓力感測器,以偵測無線電力接收器60的位置,來取代根據電流量變化之偵測方法。
如上述說明,根據本發明實施例,無線電力傳輸器100透過配置在墊片25,且對應無線電力接收器60之位置的特定傳輸共振單元20以傳輸能量,因此可增傳輸至無線電力接收器60的能量傳輸效率。
根據本發明之一實施例,圖6繪示藉由無線電力傳輸器100傳輸能量之方法的流程圖。
下文中,根據本發明之一實施例,藉由無線電力傳輸器100來傳輸能量的方法,將參考圖5說明之。
參考圖6,無線電力傳輸器100依序施加偵測電力至複數個傳輸共振單元20(步驟S101)。根據一實施例,無線電力傳輸器100控制開關單元14依序施加偵測電力至該些傳輸共振單元20。根據一實施例,該偵測電力係指具有對應該傳輸共振單元20的自我共振頻率f1之交流電。
下文中,無線電力傳輸器100根據該偵測電力量測內部電流(步驟S103)。根據一實施例,無線電力傳輸器100的內部電流可以是從電 源供應單元11輸出的電流,但實施例並非限定於此。
該量測電流根據傳輸共振單元20的阻抗特性而可有所變化。更詳細的說,如果具有與共振頻率f1相對應的頻率之偵測電力施加在傳輸共振單元20上,無線電力傳輸器100的阻抗將大為增加,使測得的電流縮減至最小。如果施加在傳輸共振單元20上之偵測電力的頻率與共振頻率f1不同時,無線電力傳輸器100的阻抗減少,使測得的電流增加。
下文中,無線電力傳輸器100判斷該測得的電流是否超過閾值(步驟S105)。根據一實施例,該閾值係能偵測到位在傳輸共振單元20上之無線電力接收器所需的最小電流。換言之,如果測得的電流等於或大於閾值,無線電力接收器60可被判斷其位在該特定的傳輸共振單元20上。
如果測得的電流值等於或大於閾值,無線電力傳輸器100判斷無線電力接收器60位在該特定傳輸共振單元20上(步驟S107)。換言之,由於互感部件的緣故,如果無線電力接收器60位在該特定傳輸共振單元20上,與該無線電力接收器相對應的傳輸共振單元20其共振頻率被改變成互變共振頻率f2,其如參照圖5之說明。此外,由於該偵測電力具有不同於共振頻率f1的頻率,其被施加在與對應無線接收器60之位置的傳輸共振單元20時,所測得的電流可有等於或大於閾值之一電流值。
下文中,無線電力傳輸器100判斷對應無線接收器60之位置的傳輸共振單元20作為電力傳輸的傳輸共振單元(步驟S109)。根據一實施例,無線電力傳輸器100可在所有的傳輸共振單元20中判斷對應無線接收器60之位置的傳輸共振單元20。舉例而言,如圖5所示,如果無線電力接收器60位在傳輸共振單元20所配置的第二列第一行、第二列第二行、第三列第一行,以及第三列第二行的位置,傳輸共振單元20可判斷僅由配置在第二列第一行位置、第二列第二行、第三列第一行位置,以及第三列第二行之位置的傳輸共振單元20作為電力傳輸至無線電力接收器60的傳輸共振單元20。
根據另一實施例,無線電力傳輸器100可判斷僅由配置在第二列第二行位置,因其與無線電力接收器60相重疊的部分最大,可作為電力傳輸之傳輸共振單元20。
下文中,無線電力傳輸器100透過該已決定之傳輸共振單元20傳輸電力(步驟S111)。根據一實施例,無線電力傳輸器100透過該已決定的傳輸共振單元20,控制開關單元14以傳輸電力至無線電力接收器60。
如上述說明,根據本發明實施例,無線電力傳輸器100透過與無線電力接收器60位置相對應之傳輸共振單元20傳輸能量,因此可以增進電力傳輸效應。
以及,無線電力傳輸器100透過一特定傳輸共振單元20集中能量傳輸,因此降低的能量消耗,並且降低了磁場對人體的傷害。
雖然已參考許多說明性實施例來描述實施例,但應理解,可由熟習此項技術者設計的許多其他修改及實施例將落入本揭示案之原理之精神及範疇內。更特定言之,在本揭示案、圖式及所附申請專利範圍之範疇內的所主張之組合配置之零部件及/或配置的各種變化及修改為可能的。除了零部件及/或配置之變化及修改外,對於熟習此項技術者而言,替代用途亦將為顯而易見的。
11‧‧‧電源供應單元
12‧‧‧外加電力偵測單元
13‧‧‧電流量測單元
14‧‧‧開關單元
15‧‧‧控制器
20‧‧‧電力傳輸單元
21‧‧‧傳輸線圈單元
22‧‧‧傳輸共振線圈單元
22a‧‧‧電容器
25‧‧‧墊片
60‧‧‧無線功率接收器
100‧‧‧無線電力傳輸器

Claims (14)

  1. 一種無線電力傳輸器,藉由使用共振效應傳輸無線電力至一無線電力接收器,該無線電力傳輸器包含:複數個傳輸共振單元;一開關單元,切換至少一該複數傳輸共振單元;一經組態控制器,控制施加的一偵測電力至該複數傳輸共振單元以偵測該無線電力接收器的位置;一電流量測單元,根據所傳輸的該偵測電力,量測流經於該無線電力傳輸器之一內部的一電流,以及其中,當所測得的該電流等於或大於一閾值,該控制器判斷該至少一對應該無線電力接收器之位置的傳輸共振單元,並透過該至少一傳輸共振單元控制該開關單元以傳輸該無線電力至該無線電力接收器。
  2. 如專利申請範圍第1項所述之無線電力傳輸器,更包含一電源供應單元傳輸交流電力,該交流電力具有一互變共振頻率,該互變共振頻率係由該無線電力接收器的一接收共振單元和對應於該無線電力接收器之位置的該至少一傳輸共振單元之間的一互感部件來改變。
  3. 如專利申請範圍第2項所述之無線電力傳輸器,其中該互變共振頻率對應流經於該無線電力傳輸器之內部的該電流,其中該互變共振頻率係預先以一對照表格式儲存。
  4. 如專利申請範圍第3項所述之無線電力傳輸器,其中該電力供應單元係被控制以產生交流電力,該交流電力具有與流經該無線電力傳輸器該內 部的該電流相對應之該互變共振頻率。
  5. 如專利申請範圍第1項所述之無線電力傳輸器,其中該閾值係為偵測該無線電力接收器所需的一最小傳輸共振單元的電流值。
  6. 如專利申請範圍第1項所述之無線電力傳輸器,其中每一傳輸共振單元包括一傳輸共振線圈單元;該傳輸共振線圈單元透過共振現象傳輸該電力至該無線電力接收器之一電力接收單元。
  7. 如專利申請範圍第1項所述之無線電力傳輸器,更包含一墊片供該些傳輸共振單元配置其於上方,其中該些傳輸共振單元以一柵格(lattice)或一矩陣(matrix)方式排列。
  8. 如專利申請範圍第1項所述之無線電力傳輸器,其中該無線電力傳輸器的該內部包括該些複數傳輸共振單元。
  9. 一種無線電力傳輸方法,藉由使用共振效應以無線傳輸無線電力至一無線電力接收器之一無線電力傳輸器,該無線電力傳輸方法包括:施加一偵測電力至複數個傳輸共振單元以偵測該無線電力接收器之一位置;根據該偵測電力,量測流經該複數傳輸共振單元的一電流;當所測得的該電流等於或大於一閾值,判斷至少一對應該無線電力接收器之位置的該傳輸共振單元;以及經由該至少一傳輸共振單元傳輸該無線電力至該無線電力接收器。
  10. 如專利申請範圍第9項所述之無線電力傳輸方法,其中該無線電力包括交流電力,該交流電力具有一互變共振頻率,該互變共振頻率係由該無線電力接收器的一接收共振單元和對應於該無線電力接收器之位置的該 至少一傳輸共振單元之間的一互感部件來改變。
  11. 如專利申請範圍第9項所述之無線電力傳輸方法,其中該偵測電力係為依序施加於該些複數傳輸共振單元。
  12. 如專利申請範圍第10項所述之無線電力傳輸方法,該互變共振頻率對應流經於該無線電力傳輸器之內部的該電流,其中該互變共振頻率係預先以一對照表格式儲存。
  13. 如專利申請範圍第12項所述之無線電力傳輸方法,其中該互變共振頻率對應於該電流,該電流係為流經對應於該無線電力接收器之位置的該至少一傳輸共振單元。
  14. 如專利申請範圍第9項所述之無線電力傳輸方法,其中該電力係藉由共振效應傳輸至該無線電力接收器之一電力接收單元。
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