201212460 六、發明說明： 【發明所屬之技術領域】 本發明係關於可利用電磁感應，從充電器對複數揭帶 機器傳送電力的非接觸電力傳送裝置。 【先前技術】 至今為止，已知有非接觸電力傳送裝置，對行動電話、 數位相機等的攜帶機器中内置的二次電池進行非接觸地充 電。攜帶機器以及對應攜帶機器之專用充電器中分別具備 線圈，兩線圈藉由電磁感應，從充電器傳送交流電力至攜 帶機器。攜帶機器係將傳送來的交流電力變換為直流電 力，以此直流電力對二次電池充電。 另外，如此的非接觸電力傳送裝置中，已提案有可一 次同時對複數攜帶機器充電的系統（例如，參照專利文獻 1)。如此的系統中’以預定方法決定對載置於充電平台的 複數攜帶機器充電的順序，依其順序對複數攜帶機器充 電。藉此’與一次同時對各攜帶機器充電的情況相較，可 抑制充電器的電源於較小的規格。 [先前技術文獻] [專利文獻] [專利文獻1] 曰本專利公開公報特開2010-22105號 【發明内容】 [發明所欲解決的問題] 201212460 但上述可一次同時對複數攜帶機器充電的系統中，非 充電中的攜帶機器的電池容量係逐漸減少。例如，將行動 電話等具有待機狀態的機器載置於充電器，以僅存的電池 容量而可維持待機狀態的情況下，若充電的優先順序被設 定為較低時，則有等待充電順序的時間中，電池容量減少 為無法維持待機狀態的情況。 本發明的目的係提供一種非接觸電力傳送裝置，可抑 制充電器的電源於較小的規格，且可防止被充電機器的電 池容量的減少。 [解決問題的技術手段] 為了解決上述問題，請求項1中記載的發明係一種非 接觸電力傳送裝置，可同時對複數機器進行非接觸充電， 其係具備：複數送電側電路，分別對前述複數機器非接觸 傳送電力；以及充電控制部，控制前述複數送電側電路， 以預定順序對前述複數機器實際充電，並且，前述複數機 器中的預定機器於前述實際充電中的狀態下，對未實際充 電的機器，以較前述實際充電的充電值低的充電值，進行 低比率充電。 【實施方式】 以下，依據圖式，說明將本發明具體化的一實施型態 的非接觸充電系統。 圖1係表示本實施型態的非接觸充電系統。本實施型 態的非接觸充電系統的充電器20可同時對複數攜帶機器 10a、10b、10c進行非接觸充電。複數攜帶機器10a〜10c 4 201212460 可包含例如行動電話、數位相機及遊戲機等。 各攜帶機器l〇a〜10c，例如，若為數位相機，則具備 用以執行靜止影像、動態影像的攝影等之主要機能的機能 電路（省略圖示），基於來自内置的二次電池11的電力供 給而動作。另外，各攜帶機器10a〜10c中内置的受電側電 路12係將藉由電力線圈13而受電的來自充電器20的預定 的交流電力，變換為預定的直流電力。二次電池11係以其 直流電力充電。另外，各攜帶機器l〇a〜10c係具備認証電 路14，該認証電路14係透過認証線圈15，於充電器20之 間進行確認信號的授受。 充電器20係具備從外部接受商用電源供給，且控制對 於各攜帶機器l〇a〜10c的充電的充電控制部21;與充電控 制部21電性連接，將充電控制部21供給的直流電力變換 為交流電力的複數送電側電路22 ;以及，連接於各送電側 電路22的電力線圈23。各送電側電路22係分別設於載置 攜帶機器10a〜10c的複數載置點（省略圖示）。各送電側 電路22係將交流電力透過電力線圈23，傳送電力至載置 於對應載置點的攜帶機器l〇a〜10c的電力線圈13。又，本 實施型態的充電器20中係設置可同時對三個攜帶機器10a 〜l〇c充電的三個載置點。另外，充電器20中係設有分別 對應各載置點的三個送電側電路22以及三個電力線圈23。 另外，充電器20係於前述每個載置點各具備與充電控 制部21電性連接的認証電路24。該認証電路24係透過認 證線圈24,於載置於對應的載置點的攜帶機器10a〜10c 的認証電路14之間，進行確認信號的授受。 201212460 亦即，基於其確認信號的授受，判定載置於充電器2〇 的載置點之物，是否為適合該充電器2〇的攜帶機器l〇a〜 10c，回應適合的攜帶機器10a〜10c之判定，則對充電控 制部21輸出充電許可信號。然後，充電控制部2丨係基於 其充電許可信號的輸入，向載置於其載置點的攜帶機器1〇a 〜l〇c開始送電。藉此，不適合充電器2〇的攜帶機器或金 屬等載置於充電器20的情況時，不實施送電，因此可防止 不必要的充電動作。 另外，充電器20的各認証電路24係於載置於對應載 置點的攜帶機器10a〜l〇c為適合機器的情況時，基於認證 線圈15、25之間的通信，判別其載置的攜帶機器i〇a〜1〇c 的種類，對充電控制部21輸出對應其機器種類的機種判別 信號。 另外，充電益20係具備用以檢測供給至各送電側電路 22的各別的電壓之電壓檢測部26a、26b、26c，以及用以 檢測供給至各送電侧電路22的各別的電流之電流檢測部 27a、27b、27c。可基於其電壓檢測部26a〜26e與電流檢 測部27a〜27c的測定值，檢測對各攜帶機器1〇a〜1〇e的 輸入電力。 接著，說明本實施型態的充電器20的充電控制部21 的控制態樣。 充電器20的載置點中，適合的複數攜帶機器1〇a〜 載置於載置點的狀態下，導通充電器2〇，（例如，將充電 器20連接於商用電源）。然後，充電控制部21係基於從各 認言正電路24輸出的機種判別信號，決定對所載置的複數攜 6 201212460 帶機器10a〜l〇c實際充電的順序。亦即，充電控制部21 係基於攜帶機器l〇a〜10c的攜帶機器資訊，決定對所載置 的攜帶機器10a〜10c實際充電的優先順序。 本實施型態中，充電控制部21係將具有待機機能的攜 帶機器設定為第一實際充電優先順序。 另外，充電控制部21係基於載置點的優先順序（例 如，載置點的優先順序係從載置攜帶機器1〇a的載置點 起，向右側依序降低），決定其他攜帶機器的實際充電優先 順序。例如，攜帶機器l〇a為行動電話（具有待機機能）， 攜帶機器i〇b為數位相機（無待機機能），攜帶機器1〇c為 遊戲機（無待機機能）的情況時，充電控制部21係設定攜 帶機器10a為第一優先順序，攜帶機器1〇b為第二優先順 序，然後，攜帶機器10c為第三優先順序。 如此，充電控制部21係決定實際充電的優先順序，對 設定為第一優先順序的攜帶機器1〇a開始實際充電（參照 圖2 (a))。在此，於對攜帶機器1〇a進行實際充電中的狀 態下，充電控制部21係控制以較實際充電的充電值出小 的充電值La，對其他的攜帶機li l〇b、l〇c進行低比率充 Ϊ敢H，充餘卿21係設定對被設為第-優錢序的 器10a進行實際充電之際的低比率充電的充電值 a °充電控制部21係基於電壓檢測部26&與電流檢測部 a檢測對攜帶機器1〇a進行實際充電之際的輸入電力。 係基於其檢測的輸入電力，以不超過電源的 額疋輸出來設定低比率充電的充電值La。 例如，電源的額定輸出為10w，對攜帶機B 進行 201212460 實際充電之際的輸入電力（基於電驗測部26a與電流檢 測部⑼的測定值的輸入電力）AW的情況時，低比率 充電的充電值La即設定為將額讀出（猜）減去攜帶機 器他的輸入電力5W所剩餘的，，除以非實際充電令的 台數（一台）的電力值，即2 5W。藉此，充電控制部2ι =對攜帶機器10a進行實際充電，且在不超過電源的額定 輸出的情況下，以充電值La對攜帶機器⑽、他進行低 比率充電。又’電源的較輸出錢定為適合於充電器2〇 的複數機種之中，充電之際必需的電力為最大的機種的電 力值以上。 /右對攜帶機H l〇a的實際充電結纟，則充電控制部 係開始對設定為第二優先順序的攜帶機器⑽進行實際充 電’並對攜帶機器l〇a、1()e進行低比率充電（參照圖2 (b))。此時的低比率充電的充電值Lb係與上述對攜帶機 器10a進行實際充電的情況相同地設定。對攜帶機器i〇b 的實際充電結束，開始對攜帶機器1Ge實際充電的情況亦 相同（參照圖2 (〇)。亦即，攜帶機器1〇a〜1〇c中之一者 以充電值Ha、Hb、Hc進行實際充電之際，剩餘的攜帶機 器l〇a〜10c係分別設定為低比率充電的充電值Lb、 Lc 〇 如此，充電控制部21係於攜帶機器10a〜1〇c中之一 者進行實際充電中的狀態下，對剩餘的攜帶機器1〇a〜1〇c 進行低比率充電地控制。因此，與一次同時對各攜帶機器 10a〜l〇c進行實際充電的情況相較，可抑制充電器2〇的電 源於較小的規格（額定輸出），且可防止未進行實際充電的 8 201212460 攜帶機器10a〜l〇c的電池容量的減少。 接著，記载本實施型態的特徵性作用效果。 (1) 充電控制部21係依預定順序以充電值Ha〜He 依序對攜帶機器l〇a〜l〇c進行實際充電地控制。另外，充 電控制部21係攜帶機器i〇a〜i〇c之中的預定機器於實際 充電中的狀態下，對未實際充電的攜帶機器1〇a〜1〇c，分 別以較實際充電的充電值Ha〜He低的充電值La〜Lc，進 行低比率充電地控制。因此，與一次同時對各攜帶機器1〇a 〜10c進行實際充電的情況相較，可抑制充電器2〇的電源 於較小的規格，且可防止被充電機器（攜帶機器1〇a〜1〇c) 的電池容量的減少。 (2) 充電控制部21係基於實際充電的輸入電力，設 定低比率充電的充電值La〜Lc，因此，可有效率地利用電 源（充電器20)的額定輸出。 (3) 充電控制部21係基於來自攜帶機器1〇a〜1〇c的 機器資訊（機種判別信號），決定對攜帶機器1〇a〜1〇c進 行實際充電的順序，因此，可對應攜帶機器1〇a〜1(k的種 類’以適當的順序進行實際充電。 又，本發明的實施型態亦可如以下般地變化。 •上述實施型態中，基於實際充電的輸入電力來設定 其他攜帶機器10a〜10c的低比率充電的充電值La〜L， 但並未特別限定於此。例如，亦可基於來自認証電路以的 機種判別信號（機器資訊），設定低比率充電的充電值La 〜Lc。此時’例如’充電的複數機器中有行動電話時，以 其行動電話的待機狀態所需的充分電力值，設定為低比率 201212460 充電的充電值。若為如此的構成，即可使被充電機器的電 池谷量不減少，而可有效率地對攜帶機器1〇a〜1〇c充電。 •上述實施型態中，依據攜帶機器10a〜10c的種類來 決定實際充電的順序，但並未特別限定於此。例如，亦可 將攜帶機器10a〜l〇c之中電池容量(可充電的最大電力量) 小的攜帶機器10a〜l〇c的優先順序提高而決定實際充電的 ，序（參照圖3 (a)、（b)、（c))。又，圖3係表示攜帶機 器10a的電池容量最小，攜帶機器1〇c的電池容量最大的 情況。若為如此的構成，因先從電池容量小的攜帶機器卫如 〜10c進行實際充電而有助益於有效率的充電。 另外，此外例如亦可將攜帶機器10a〜1〇c之中電池殘 餘量較小的攜帶機器l〇a〜l〇c的優先順序提高而決定實際 充電的順序。若為如此的構成，因先從電池殘餘量較小的 攜帶機器10a〜10c進行實際充電而有助益於有效率的 電。 •上述實施型態中，充電控制部21係決定實際充電的 優先順序而構成，但並未特別限定於此。例如，亦可預先 對於載置點設定實際充電的優先順序，以載置點決定實際 充電的優先順序，另外，亦可依載置的順序進行實際充電。 •上述實施型態中，充電控制部21係分別對攜帶機器 l〇a〜l〇c進行一次實際充電來控制，但並未特別限定於 此。充電控制部21亦可依預定順序重覆進行複數次的實際 充電來控制，至各攜帶機器l〇a〜l〇c的充電結束為止（; 如’參照圖4 (a)、（b)、（c))。若為如此的構成，因可對 攜帶機器10a〜l〇c相同地充電而有助益於有效率的充電。 201212460 •上述實施型態係適用於攜帶機器1〇a〜1〇c與充電器 2〇之間的非接觸充電系統，但亦可適用於其他進行非接觸 電力傳送的機器。 【圖式簡單說明】 圖1係本實施型態的非接觸充電系統的構成圖。 圖2 ( a)、（b)、（ c)係用以說明本實施型態的充電控 制的說明圖。 圖3 (a)、（b)、（c)係用以說明其他實施型態的充電 控制的說明圖β 圖4 (a)、（b)、（c)係用以說明其他實施型態的充電 控制的說明圖。 主要元件符號說明】 l〇a ‘·攜帶機器 l〇b ··攜帶機器 l〇c :攜帶機器 11 :,二次電池 12 :受電側電路 13 :電力線圈 14 :認証電路 15 :認証線圈 20 :充電器 21 :充電控制部 22 :送電側電路 23 :電力線圈 24 :認証電路 25 :認証線圈 26a :電壓檢測部 26b :電壓檢測部 26c :電壓檢測部 27a:電流檢測部 27b :電流檢測部 27c :電流檢測部201212460 VI. Description of the Invention: [Technical Field] The present invention relates to a non-contact power transmission device that can transmit power from a charger to a plurality of unloading machines by electromagnetic induction. [Prior Art] A non-contact power transmission device has been known to charge a secondary battery built in a portable device such as a mobile phone or a digital camera in a non-contact manner. The portable device and the dedicated charger for the portable device respectively have coils, and the two coils transmit AC power from the charger to the carrying device by electromagnetic induction. The portable device converts the transmitted AC power into DC power, thereby charging the secondary battery with DC power. Further, in such a non-contact power transmission device, a system capable of simultaneously charging a plurality of portable devices has been proposed (for example, refer to Patent Document 1). In such a system, the order of charging the plurality of portable devices placed on the charging platform is determined in a predetermined manner, and the plurality of portable devices are charged in the order. By this, it is possible to suppress the power supply of the charger to a smaller size than when charging each portable device at the same time. [Prior Art Document] [Patent Document 1] [Patent Document 1] Japanese Laid-Open Patent Publication No. 2010-22105 [Draft of the Invention] [Problems to be Solved by the Invention] 201212460 However, the above system capable of simultaneously charging a plurality of portable machines at a time In the middle, the battery capacity of the non-charging portable device is gradually reduced. For example, when a device having a standby state such as a mobile phone is placed in a charger and the standby state is maintained with the remaining battery capacity, if the priority of charging is set to be low, there is a waiting for charging sequence. During the time, the battery capacity is reduced to the point where the standby state cannot be maintained. SUMMARY OF THE INVENTION An object of the present invention is to provide a contactless power transmission device which can suppress a power supply of a charger to a small size and prevent a reduction in battery capacity of a charged machine. [Means for Solving the Problems] In order to solve the above problem, the invention described in claim 1 is a non-contact power transmission device capable of simultaneously performing non-contact charging on a plurality of devices, and having a plurality of power transmission side circuits, respectively The machine non-contactly transmits power; and a charging control unit that controls the plurality of power transmitting side circuits to actually charge the plurality of devices in a predetermined order, and the predetermined machine in the plurality of machines is not actually charged in the state of the actual charging The machine performs low-rate charging with a lower charging value than the actual charged charging value. [Embodiment] Hereinafter, a non-contact charging system according to an embodiment of the present invention will be described based on the drawings. Fig. 1 shows a non-contact charging system of this embodiment. The charger 20 of the non-contact charging system of the present embodiment can simultaneously perform non-contact charging of the plurality of portable devices 10a, 10b, 10c. The plurality of portable devices 10a to 10c 4 201212460 may include, for example, a mobile phone, a digital camera, a game machine, and the like. Each of the portable devices 10a to 10c includes, for example, a function circuit (not shown) for performing main functions such as still image and moving image shooting, and is based on the secondary battery 11 from the built-in secondary battery 11 Power supply operates. Further, the power receiving side circuit 12 incorporated in each of the portable devices 10a to 10c converts predetermined AC power from the charger 20, which is received by the power coil 13, into predetermined DC power. The secondary battery 11 is charged with its DC power. Further, each of the portable devices 10a to 10c is provided with an authentication circuit 14, and the authentication circuit 14 transmits the authentication signal to and from the charger 20 via the authentication coil 15. The charger 20 includes a charging control unit 21 that receives commercial power supply from the outside and controls charging of the portable devices 10a to 10c, and is electrically connected to the charging control unit 21 to convert the DC power supplied from the charging control unit 21. The power transmission side circuit 22 is an alternating current power source; and the power coil 23 is connected to each power transmission side circuit 22. Each of the power transmission side circuits 22 is provided at a plurality of mounting points (not shown) on which the portable devices 10a to 10c are placed. Each of the power transmitting side circuits 22 transmits AC power to the power coil 23, and transmits power to the power coils 13 of the portable devices 10a to 10c placed on the corresponding mounting points. Further, in the charger 20 of the present embodiment, three mounting points capable of simultaneously charging the three portable devices 10a to 10c are provided. Further, in the charger 20, three power transmission side circuits 22 and three power coils 23 respectively corresponding to the respective placement points are provided. Further, the charger 20 is provided with an authentication circuit 24 electrically connected to the charging control unit 21 at each of the above-described mounting points. The authentication circuit 24 transmits and receives the confirmation signal through the authentication coil 24 between the authentication circuits 14 of the portable devices 10a to 10c placed on the corresponding placement points. 201212460, that is, based on the transmission and reception of the confirmation signal, it is determined whether or not the object placed on the load point of the charger 2 is a portable device 10a to 10c suitable for the charger 2, and responds to the appropriate portable device 10a~ In the determination of 10c, the charging control unit 21 outputs a charging permission signal. Then, the charging control unit 2 starts to transmit power to the portable devices 1a to 〇cc placed on the mounting point based on the input of the charging permission signal. As a result, when the portable device or the metal that is not suitable for the charger 2 is placed on the charger 20, power transmission is not performed, so that unnecessary charging operation can be prevented. Further, when each of the authentication circuits 24 of the charger 20 is a suitable device in the case where the portable devices 10a to 10c placed on the corresponding placement point are suitable for the device, it is determined based on the communication between the authentication coils 15 and 25. The type of the portable devices i〇a to 1〇c is output to the charging control unit 21 to output a model determination signal corresponding to the type of the device. Further, the charging benefit 20 includes voltage detecting units 26a, 26b, and 26c for detecting respective voltages supplied to the respective power transmitting side circuits 22, and currents for detecting respective currents supplied to the respective power transmitting side circuits 22. Detection units 27a, 27b, and 27c. The input power to each of the portable devices 1a to 1A can be detected based on the measured values of the voltage detecting units 26a to 26e and the current detecting units 27a to 27c. Next, a control aspect of the charging control unit 21 of the charger 20 of the present embodiment will be described. Among the mount points of the charger 20, a suitable plurality of portable devices 1a to 2 are placed on the mount point, and the charger 2 is turned on (for example, the charger 20 is connected to a commercial power source). Then, based on the model discrimination signal outputted from each of the recognition positive circuits 24, the charging control unit 21 determines the order in which the plurality of portable devices 6201212460 devices 10a to 10c are actually charged. In other words, the charging control unit 21 determines the priority order of actually charging the portable devices 10a to 10c on the basis of the portable device information of the portable devices 10a to 10c. In the present embodiment, the charging control unit 21 sets the portable device having the standby function to the first actual charging priority. Further, the charging control unit 21 is based on the priority order of the placement points (for example, the priority order of the placement points is sequentially lowered from the placement point on which the portable device 1A is placed) to the right side, and the other portable devices are determined. Actual charging priority. For example, when the portable device l〇a is a mobile phone (having a standby function), the portable device i〇b is a digital camera (no standby function), and the portable device 1〇c is a game machine (no standby function), the charging control unit In the 21st, the portable device 10a is set to the first priority order, and the portable device 1b is the second priority order, and then the portable device 10c is in the third priority order. In this manner, the charging control unit 21 determines the priority order of the actual charging, and starts the actual charging of the portable device 1a set to the first priority order (see Fig. 2(a)). Here, in a state in which the portable device 1a is actually charged, the charging control unit 21 controls the charging value La which is smaller than the actually charged charging value, and the other portable devices li l〇b, l〇 c is a low-rate charge H, and the charge control 21 is based on a voltage detection unit that sets a charge value of a low-rate charge when actually charging the device 10a that is set as the first-best order. 26 & and the current detecting unit a detects input power when the portable device 1a is actually charged. Based on the detected input power, the charging value La of the low-rate charging is set so as not to exceed the output of the power source. For example, when the rated output of the power supply is 10w and the input power (the input power based on the measured value of the electrical detection unit 26a and the current detecting unit (9)) AW when the portable device B is actually charged in 201212460, the low-rate charging is performed. The charging value La is set to be the amount of power (ie, one) of the number of non-actual charging orders, that is, 2 5W, which is calculated by subtracting the amount of input power from the machine 5W. Thereby, the charging control unit 2i = actual charging of the portable device 10a, and when the rated output of the power source is not exceeded, the portable device (10) is charged at a low rate with the charging value La. In addition, the output of the power supply is set to be suitable for the charger 2 复. The power required for charging is equal to or greater than the power of the largest model. / Right to the actual charging balance of the portable device H l〇a, the charging control unit starts to actually charge the portable device (10) set to the second priority order' and lowers the portable device l〇a, 1()e Ratio charging (refer to Figure 2 (b)). The charge value Lb of the low-rate charge at this time is set in the same manner as the case where the portable device 10a is actually charged as described above. The same is true for the actual charging of the portable device i〇b, and the actual charging of the portable device 1Ge is started (refer to Fig. 2 (〇). That is, one of the portable devices 1〇a~1〇c is charged with the value Ha. When Hb and Hc are actually charged, the remaining portable devices 10a to 10c are respectively set to charge values Lb and Lc of low-rate charging, and the charging control unit 21 is connected to the portable devices 10a to 1c. In the state in which the actual charging is being performed, the remaining portable devices 1a to 1〇c are controlled to perform low-rate charging. Therefore, compared with the case where the portable devices 10a to 10c are actually charged at the same time. It is possible to suppress the power supply of the charger 2 于 from being of a small size (rated output), and to prevent the battery capacity of the 2012 12460 portable devices 10a to 10c that are not actually charged from being reduced. Next, the present embodiment is described. (1) The charging control unit 21 sequentially controls the portable devices 10a to l〇c in order of charging values Ha to He in a predetermined order. The charging control unit 21 carries the device. Reservations among i〇a~i〇c In the state of being actually charged, the portable devices 1a to 1〇c that are not actually charged are controlled by low-rate charging with charging values La to Lc lower than the actually charged charging values Ha to He, respectively. Therefore, compared with the case where the portable devices 1a to 10c are actually charged at the same time, the power supply of the charger 2〇 can be suppressed to a small size, and the charged device can be prevented (the portable device 1〇a~1) 〇c) The battery capacity is reduced. (2) The charging control unit 21 sets the charging values La to Lc of the low-rate charging based on the actually-charged input power, so that the power supply (charger 20) can be efficiently utilized. (3) The charging control unit 21 determines the order in which the portable devices 1a to 1c are actually charged based on the device information (model determination signal) from the portable devices 1a to 1〇c. Corresponding to the portable devices 1a to 1 (the type of k' is actually charged in an appropriate order. Further, the embodiment of the present invention may be changed as follows. In the above embodiment, the input power based on actual charging is performed. To set other carry The charge values La to L of the low-rate charge of the devices 10a to 10c are not particularly limited thereto. For example, the charge value La of the low-rate charge may be set based on the model discrimination signal (machine information) from the authentication circuit. Lc. At this time, when there is a mobile phone in the plural device such as 'charging, the sufficient power value required for the standby state of the mobile phone is set to a charging value of the low ratio 201212460. If it is such a configuration, The battery capacity of the device to be charged is not reduced, and the portable devices 1a to 1〇c can be charged efficiently. • In the above embodiment, the order of actual charging is determined according to the types of portable devices 10a to 10c, but It is not specifically limited to this. For example, the priority order of the portable devices 10a to 10c having a small battery capacity (the maximum amount of chargeable power) among the portable devices 10a to 10c can be increased to determine the actual charging (see FIG. 3 (a). ), (b), (c)). Further, Fig. 3 shows a case where the capacity of the portable device 10a is the smallest, and the capacity of the portable device 1c is the largest. In such a configuration, it is advantageous to charge efficiently because the actual charging is performed from a portable battery such as ~10c with a small battery capacity. Further, for example, the priority order of the portable devices 10a to l〇c in which the battery residual amount is small among the portable devices 10a to 1c can be increased to determine the order of actual charging. With such a configuration, it is possible to benefit from efficient charging by first performing actual charging from the portable devices 10a to 10c having a small remaining battery amount. In the above embodiment, the charging control unit 21 is configured to determine the priority order of actual charging, but is not particularly limited thereto. For example, the priority order of the actual charging may be set in advance for the placement point, the priority order of the actual charging may be determined by the placement point, and the actual charging may be performed in the order in which they are placed. In the above embodiment, the charging control unit 21 controls the portable devices l〇a to l〇c to perform actual charging once, but is not particularly limited thereto. The charging control unit 21 can also control the actual charging by repeating a plurality of times in a predetermined order until the charging of each of the portable devices 10a to l〇c is completed (as described in "refer to FIG. 4 (a), (b), (c)). With such a configuration, it is possible to charge the portable devices 10a to 10c in the same manner, which contributes to efficient charging. 201212460 • The above implementation is applicable to the non-contact charging system between the portable 1〇a~1〇c and the charger 2〇, but it can also be applied to other machines that perform contactless power transmission. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram of a non-contact charging system of the present embodiment. Fig. 2 (a), (b), and (c) are explanatory views for explaining the charging control of the present embodiment. 3 (a), (b), and (c) are explanatory diagrams for explaining charge control of other embodiments. FIG. 4 (a), (b), and (c) are for explaining other embodiments. Description of the charge control. Explanation of main component symbols] l〇a '·portable machine l〇b ··portable machine l〇c : portable device 11 :, secondary battery 12 : power receiving side circuit 13 : power coil 14 : authentication circuit 15 : authentication coil 20 : Charger 21: Charging control unit 22: Power transmission side circuit 23: Power coil 24: Authentication circuit 25: Authentication coil 26a: Voltage detecting unit 26b: Voltage detecting unit 26c: Voltage detecting unit 27a: Current detecting unit 27b: Current detecting unit 27c : Current detection unit