JP2018117451A - Wireless power transmission system and wireless intercom system - Google Patents

Wireless power transmission system and wireless intercom system Download PDF

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JP2018117451A
JP2018117451A JP2017006847A JP2017006847A JP2018117451A JP 2018117451 A JP2018117451 A JP 2018117451A JP 2017006847 A JP2017006847 A JP 2017006847A JP 2017006847 A JP2017006847 A JP 2017006847A JP 2018117451 A JP2018117451 A JP 2018117451A
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JP6739362B2 (en
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秀明 三好
Hideaki Miyoshi
秀明 三好
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Aiphone Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To prevent a reduction of a transmission power even when a resonance coil on a power transmitting side and a resonance coil on a power receiving side mutually approach in excess.SOLUTION: A wireless power transmission system has a power transmission device 1 having a high-frequency power supply portion 12 and a power transmission coil portion 13 with a power transmitting side resonance coil L1, and a power reception device 2 having a power reception coil portion 21 with a power receiving side resonance coil L2. The high-frequency power supply portion 12 has a power amplifying portion 32 amplifying power transmitted, a directional coupler 33 for detecting traveling wave power transmitted from the power amplifying portion 32 to the power transmission coil portion 13 and reflected wave power reflected from the power transmission coil portion 13, a differential amplifying portion 35 for detecting an increase/decrease of the reflected wave power from a detected value of the directional coupler 33, and an output control portion 36 controlling the power amplifying portion 32 based on an output of the differential amplifying portion 35. The output control portion 36 increases an output of the power amplifying portion 32 when detecting an increase of the reflected wave power from the output of the differential amplifying portion 35.SELECTED DRAWING: Figure 1

Description

本発明は、磁界共振結合方式により電力をワイヤレス伝送するワイヤレス電力伝送システム、及びこの電力伝送システムを適用したインターホンシステムに関する。   The present invention relates to a wireless power transmission system that wirelessly transmits power by a magnetic resonance coupling method, and an interphone system to which the power transmission system is applied.

従来、電力をワイヤレス伝送する方式としては、電磁誘導方式が採用されていたが、磁界共振結合方式のワイヤレス電力伝送システムは、電磁誘導方式に比べてコイル間設置条件が緩く、送電距離を長くすることができるし、エネルギー伝送効率も優れているため、検討が進んでいる(例えば、特許文献1参照)。   Conventionally, the electromagnetic induction method has been adopted as a method for wirelessly transmitting electric power, but the wireless power transmission system of the magnetic resonance coupling method has a loose installation condition between the coils and lengthens the transmission distance compared to the electromagnetic induction method. In addition, since energy transmission efficiency is also excellent, studies are proceeding (see, for example, Patent Document 1).

特開2012−191697号公報JP 2012-191697 A

しかしながら、磁界共振結合方式は送電側の共振コイルと受電側の共振コイルとが接近し過ぎた場合、相互インダクタンスの影響を受けて共振周波数が2つに分離し、使用していた周波数での伝送効率が急激に悪化してしまう問題がある。
また、電波法上、高周波利用設備であるので、6.78MHz,13.56MHz等の規定のISMバンド(Industry Science Medical band)の周波数を使用する制約がある。
However, in the magnetic resonance coupling method, when the resonance coil on the power transmission side and the resonance coil on the power reception side are too close to each other, the resonance frequency is separated into two due to the influence of mutual inductance, and transmission at the used frequency is performed. There is a problem that efficiency deteriorates rapidly.
Moreover, since it is a high frequency utilization equipment in the Radio Law, there is a restriction to use a frequency of a prescribed ISM band (Industry Science Medical band) such as 6.78 MHz, 13.56 MHz.

そこで、本発明はこのような問題点に鑑み、送電側の共振コイルと受電側の共振コイルとが接近し過ぎた場合でも、送電電力の低下を防止できる磁界共振結合方式のワイヤレス電力伝送システム、及びワイヤレスインターホンシステムを提供することを目的としている。   Therefore, in view of such a problem, the present invention is a magnetic field resonance coupling type wireless power transmission system capable of preventing a decrease in transmitted power even when a resonance coil on the power transmission side and a resonance coil on the power reception side are too close, And a wireless intercom system.

上記課題を解決する為に請求項1の発明は、伝送する電力を生成する高周波電源部、及びワイヤレス送電するための送電側共振コイルを有する送電コイル部を備えた送電装置と、送電側共振コイルから送電された電力を受電するための受電側共振コイルを有する受電コイル部を備えた受電装置とを有して、6MHz以上の周波数を使用した磁界共振結合方式により、送電装置から受電装置に電力を伝送するワイヤレス電力伝送システムであって、高周波電源部は、伝送する電力を増幅する電力増幅部と、電力増幅部から送電コイル部に送出される進行波電力、及び送電コイル部から反射する反射波電力を検出するための方向性結合器と、方向性結合器の検出値から反射波電力の増減を検出するための差動増幅部と、差動増幅部の出力を基に電力増幅部を制御する出力制御部とを有し、出力制御部は、差動増幅部の出力から反射波電力の増加を検出したら、電力増幅部の出力を増大させることを特徴とする。
この構成によれば、送電コイル部と受電コイル部との距離が、設定された距離より接近して電力の伝送効率が低下しても、送電電力が増加するため受電電力の低下を防止できる。
In order to solve the above-described problems, the invention of claim 1 is a power transmission device including a high-frequency power generation unit that generates electric power to be transmitted, and a power transmission coil unit having a power transmission side resonance coil for wireless power transmission, and a power transmission side resonance coil A power receiving device having a power receiving coil unit having a power receiving side resonance coil for receiving power transmitted from the power source, and power is transmitted from the power transmitting device to the power receiving device by a magnetic resonance coupling method using a frequency of 6 MHz or more. Wireless power transmission system for transmitting power, the high frequency power supply unit includes a power amplification unit that amplifies the power to be transmitted, traveling wave power sent from the power amplification unit to the power transmission coil unit, and reflection reflected from the power transmission coil unit A directional coupler for detecting wave power, a differential amplifier for detecting increase / decrease in reflected wave power from the detected value of the directional coupler, and an output based on the output of the differential amplifier. And an output control unit for controlling the amplifying unit, the output control unit, when detecting an increase in the reflected power from the output of the differential amplifier, characterized in that to increase the output of the power amplifier.
According to this configuration, even if the distance between the power transmission coil unit and the power reception coil unit is closer than the set distance and the power transmission efficiency is reduced, the power transmission power is increased, so that the power reception power can be prevented from being lowered.

請求項2の発明は、請求項1に記載の構成において、出力制御部は、反射波電力の増加を検出しても電力増幅部の出力増大を一定時間遅延させるためのタイマを有し、タイマがタイムアップしても引き続き反射波電力の増加を検出したら、電力増幅部の出力を増大させることを特徴とする。
この構成によれば、送電コイル部と受電コイル部の接近等で反射波電力が増加しても、瞬時に送電電力は増加しないため、送電コイル部と受電コイル部との突発的な接近等による急激な電力変動を防止でき、不安定な状態となる制御を防止できる。
According to a second aspect of the present invention, in the configuration of the first aspect, the output control unit includes a timer for delaying the increase in the output of the power amplifying unit for a predetermined time even if the increase in the reflected wave power is detected. If the increase in reflected wave power is detected even after the time is up, the output of the power amplifying unit is increased.
According to this configuration, even if the reflected wave power increases due to the proximity of the power transmission coil unit and the power reception coil unit, the power transmission power does not increase instantaneously. Therefore, due to a sudden approach between the power transmission coil unit and the power reception coil unit, etc. Abrupt power fluctuation can be prevented, and control that becomes unstable can be prevented.

請求項3の発明は、来訪者が居住者を呼び出すために屋外の住戸壁面に設置された玄関子機と、玄関子機からの呼び出しに応答するための居室親機とを有し、玄関子機と居室親機との間の通信が無線で成されるワイヤレスインターホンシステムであって、玄関子機に請求項1又は2に記載のワイヤレス電力伝送システムを適用し、玄関子機内にワイヤレス電力伝送システムの受電装置を配置すると共に、玄関子機の背部となる住戸壁面の裏面に、ワイヤレス電力伝送システムの送電装置を配置し、住戸壁面を介して送電装置から送電される電力で玄関子機が動作することを特徴とする。
この構成によれば、玄関子機は無線で電力が供給されるため、電源線が必要がない。そのため、壁面に電源線等の配線を挿通するための孔を設ける必要が無く、設置が容易となる。また、壁が薄いことで玄関子機と送電装置が設定値より接近した状態で設置されても、玄関子機の受電コイル部が受信する電力が大きく低下しないよう送電電力の大きさが制御されるため、住戸によって或いは取り付ける壁面の状態によって玄関子機と送電装置の距離が変わっても玄関子機を良好に動作させることができ、壁面の厚みを気にすることなく玄関子機を設置できる。
The invention of claim 3 includes an entrance cordless handset installed on an outdoor dwelling unit wall for a visitor to call a resident, and a living room base set for responding to a call from the entrance cordless handset. A wireless intercom system in which communication between a machine and a living room master is performed wirelessly, wherein the wireless power transmission system according to claim 1 or 2 is applied to an entrance cordless handset, and wireless power transmission is performed in the entrance cordless handset. The power receiving device of the system is arranged, and the power transmission device of the wireless power transmission system is arranged on the back of the wall surface of the dwelling unit that is the back of the door unit. It is characterized by operation.
According to this configuration, the entrance cordless handset is wirelessly supplied with electric power, and therefore no power line is required. Therefore, it is not necessary to provide a hole for inserting a wiring such as a power supply line on the wall surface, and the installation becomes easy. Also, even if the entrance cordless handset and the power transmission device are installed closer than the set value due to the thin wall, the magnitude of the transmitted power is controlled so that the power received by the receiving coil section of the entrance cordless handset does not drop significantly. Therefore, even if the distance between the entrance cordless device and the power transmission device changes depending on the state of the dwelling unit or the wall surface to be attached, the entrance cordless device can be operated well, and the entrance cordless device can be installed without worrying about the thickness of the wall surface. .

請求項4の発明は、来訪者が居住者を呼び出すために屋外の住戸壁面に設置された玄関子機と、玄関子機からの呼び出しに応答するための居室親機とを有し、玄関子機と居室親機との間の通信が無線で成されるワイヤレスインターホンシステムであって、玄関子機に請求項1又は2に記載のワイヤレス電力伝送システムを適用し、玄関子機内にワイヤレス電力伝送システムの受電装置を配置すると共に、ワイヤレス電力伝送システムの送電装置或いは当該送電装置を内蔵した携帯端末を来訪者が携行し、来訪者が玄関子機に接近することで玄関子機に送電装置から電源が供給されて呼出操作が可能となることを特徴とする。
この構成によれば、待受時は玄関子機に電源が供給されないが、送電装置を携行する来訪者が居住者を呼び出すために接近すると、玄関子機に電源が供給されて起動する。よって、電源線を配設することなく呼出操作が可能であり、設置が容易であるし、省電力に構成できる。
The invention of claim 4 includes an entrance cordless handset installed on an outdoor dwelling unit wall surface for a visitor to call a resident, and a living room base phone for responding to a call from the entrance cordless handset. A wireless intercom system in which communication between a machine and a living room master is performed wirelessly, wherein the wireless power transmission system according to claim 1 or 2 is applied to an entrance cordless handset, and wireless power transmission is performed in the entrance cordless handset. In addition to arranging the power receiving device of the system, the visitor carries the power transmission device of the wireless power transmission system or the portable terminal incorporating the power transmission device, and the visitor approaches the entrance child device so that the entrance child device can move from the power transmission device. It is characterized in that a call operation is possible when power is supplied.
According to this configuration, power is not supplied to the entrance slave unit during standby, but when a visitor carrying the power transmission apparatus approaches to call a resident, power is supplied to the entrance slave unit to start up. Therefore, the calling operation can be performed without arranging the power line, the installation is easy, and the power can be saved.

請求項5の発明は、請求項3又は4に記載の構成において、玄関子機に設置されたワイヤレス電力伝送システムの受電コイル部と、通話のための回路が組み付けられた回路基板との間には、受電コイル部で発生する漏れ磁束から回路基板をシールドするための磁性体シートが配置されて成ることを特徴とする。
この構成によれば、受電装置の受電コイル部で発生する漏れ磁束が通話のための回路へ悪影響を及ぼすのを防止でき、誤動作やノイズの発生を防ぐことができる。
According to a fifth aspect of the present invention, in the configuration according to the third or fourth aspect, between the power receiving coil portion of the wireless power transmission system installed in the entrance cordless handset and a circuit board on which a circuit for calling is assembled. Is characterized in that a magnetic sheet for shielding the circuit board from leakage magnetic flux generated in the power receiving coil section is arranged.
According to this configuration, it is possible to prevent the leakage magnetic flux generated in the power receiving coil portion of the power receiving apparatus from adversely affecting the circuit for calling, and it is possible to prevent malfunction and noise.

本発明によれば、送電コイル部と受電コイル部とが設定された距離より接近して、電力の伝送効率が低下しても、送電電力が増加するため受電電力の低下を防止でき、安定した電力伝送を実現できる。   According to the present invention, even if the power transmission coil unit and the power reception coil unit are closer than the set distance and the power transmission efficiency is reduced, the power transmission power is increased, so that the power reception power can be prevented from being lowered and stable. Power transmission can be realized.

本発明に係るワイヤレス電力伝送システムの一例を示す回路ブロック図である。1 is a circuit block diagram illustrating an example of a wireless power transmission system according to the present invention. 送電コイル部と受電コイル部の構成を示す回路図である。It is a circuit diagram which shows the structure of a power transmission coil part and a receiving coil part. 本発明に係るワイヤレスインターホンシステムの概略構成図である。1 is a schematic configuration diagram of a wireless intercom system according to the present invention. 図3に示す玄関子機と送電装置の位置関係を示す説明図である。It is explanatory drawing which shows the positional relationship of the entrance cordless handset shown in FIG. 3, and a power transmission apparatus. ワイヤレスインターホンシステムの他の例を示す概略図である。It is the schematic which shows the other example of a wireless intercom system.

以下、本発明を具体化した実施の形態を、図面を参照して詳細に説明する。図1は本発明に係るワイヤレス電力伝送システムの一例を示す回路ブロック図であり、1は送電装置、2は受電装置である。
送電装置1は、商用電源等から所定の電圧の直流電力を生成する直流電源11、高周波電力を発生させる高周波電源部12、磁界共振結合方式により電力を受電装置2に送信するための送電コイル部13を備えている。受電装置2は、受電コイル部21、整流部22を備えており、整流部22により整流された受電電力が、負荷23としての例えばワイヤレスのインターホン機器の電源として供給される。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit block diagram showing an example of a wireless power transmission system according to the present invention, in which 1 is a power transmitting device and 2 is a power receiving device.
The power transmission device 1 includes a DC power source 11 that generates DC power of a predetermined voltage from a commercial power source and the like, a high frequency power source unit 12 that generates high frequency power, and a power transmission coil unit that transmits power to the power receiving device 2 using a magnetic resonance coupling method. 13 is provided. The power receiving device 2 includes a power receiving coil unit 21 and a rectifying unit 22, and the received power rectified by the rectifying unit 22 is supplied as a power source of, for example, a wireless intercom device as the load 23.

また、送電装置1の高周波電源部12は、例えば13.56MHzの高周波信号を発生する発振部31、発振部31が出力する高周波信号を増幅する電力増幅部32、電力増幅部32から送電コイル部13に送出する進行波電力に対応する信号と、送電コイル部13から反射される反射波電力に対応する信号とを取り出す方向性結合器33、方向性結合器33が取り出した信号をそれぞれ検波する直線検波器34(進行波電力に対応する信号Pfを検波する第1検波器34a、及び反射波電力に対応する信号Prを検波する第2検波器34b)、直線検波器34の出力の差分を増幅する差動増幅部35、電力増幅部32を制御する出力制御部36等を備えている。   Moreover, the high frequency power supply unit 12 of the power transmission device 1 includes, for example, an oscillation unit 31 that generates a high frequency signal of 13.56 MHz, a power amplification unit 32 that amplifies the high frequency signal output from the oscillation unit 31, and a power transmission coil unit from the power amplification unit 32. The directional coupler 33 for extracting a signal corresponding to the traveling wave power transmitted to 13 and the signal corresponding to the reflected wave power reflected from the power transmission coil unit 13, and detecting the signal extracted by the directional coupler 33, respectively. The difference between the outputs of the linear detector 34 (the first detector 34a for detecting the signal Pf corresponding to the traveling wave power and the second detector 34b for detecting the signal Pr corresponding to the reflected wave power) and the output of the linear detector 34 is obtained. A differential amplifier 35 for amplification, an output controller 36 for controlling the power amplifier 32, and the like are provided.

図2は、送電コイル部13と受電コイル部21の回路図を示している。図2に示すように送電コイル部13は、送電側給電コイルLINと送電側共振コイルL1とを備えており、送電側給電コイルLINには、コンデンサCIN及び抵抗RINが直列接続されて高周波電源部12の出力が印加される。また、送電側共振コイルL1は、コンデンサC1と抵抗R1と直列接続され、ループを形成している。送電側給電コイルLINと送電側共振コイルL1とは同心円状に近接配置されている。   FIG. 2 shows a circuit diagram of the power transmission coil unit 13 and the power reception coil unit 21. As shown in FIG. 2, the power transmission coil unit 13 includes a power transmission side power supply coil LIN and a power transmission side resonance coil L1, and the power transmission side power supply coil LIN is connected in series with a capacitor CIN and a resistor RIN, so that a high frequency power source unit is provided. Twelve outputs are applied. The power transmission side resonance coil L1 is connected in series with the capacitor C1 and the resistor R1 to form a loop. The power transmission side feeding coil LIN and the power transmission side resonance coil L1 are concentrically arranged close to each other.

一方、受電コイル部21は、受電側共振コイルL2と受電側給電コイルLOUTとを備えており、受電側共振コイルL2は、コンデンサC2と抵抗R2とが直列接続され、ループを形成している。また、受電側給電コイルLOUTは、コンデンサCOUTと抵抗ROUTと直列に接続されて整流部22に接続されている。受電側給電コイルLOUTと受電側共振コイルL2とは同心円状に近接配置されている。   On the other hand, the power reception coil unit 21 includes a power reception side resonance coil L2 and a power reception side power supply coil LOUT. The power reception side resonance coil L2 includes a capacitor C2 and a resistor R2 connected in series to form a loop. The power receiving coil LOUT is connected to the rectifier 22 in series with the capacitor COUT and the resistor ROUT. The power receiving side power supply coil LOUT and the power receiving side resonance coil L2 are concentrically arranged close to each other.

尚、送電側共振コイルL1と受電側共振コイルL2とはほぼ同一の特性を有するよう設定され、送電側給電コイルLINと受電側給電コイルLOUTとはほぼ同一の特性を有するよう設定されている。具体的なサイズ及び特性の一例を示すと、伝送周波数を13.56MHzの場合、送信側給電コイルLINと受電側給電コイルLOUTの半径を72.5mm、送電側共振コイルL1と受電側共振のコイルL2の半径を100mmとした場合、送信側共振コイルL1と受電側共振コイルL2の距離を150mmとすることで後述する単峰特性を示し、送電効率90%の達成が可能となる。   The power transmission side resonance coil L1 and the power reception side resonance coil L2 are set to have substantially the same characteristics, and the power transmission side power supply coil LIN and the power reception side power supply coil LOUT are set to have substantially the same characteristics. An example of a specific size and characteristic is as follows. When the transmission frequency is 13.56 MHz, the radius of the transmitting side feeding coil LIN and the receiving side feeding coil LOUT is 72.5 mm, the transmitting side resonance coil L1 and the receiving side resonance coil When the radius of L2 is set to 100 mm, the distance between the transmission side resonance coil L1 and the power reception side resonance coil L2 is set to 150 mm, so that a single peak characteristic described later can be obtained and a transmission efficiency of 90% can be achieved.

このように形成されたワイヤレス電力伝送システムは、電力伝送を次のように行う。送電側給電コイルLINは、高周波電源部12が出力する電力により励起され、電磁誘導により送電側共振コイルL1に高周波電力を送電する。送電側給電コイルLINから電力が伝送された送電側共振コイルL1は、送電側給電コイルLINから出力された高周波電力に基づいて磁界を発生し、磁界共鳴により受電側共振コイルL2に非接触で電力を伝送する。   The wireless power transmission system thus formed performs power transmission as follows. The power transmission side feeding coil LIN is excited by the power output from the high frequency power supply unit 12, and transmits high frequency power to the power transmission side resonance coil L1 by electromagnetic induction. The power transmission side resonance coil L1 to which power is transmitted from the power transmission side power supply coil LIN generates a magnetic field based on the high frequency power output from the power transmission side power supply coil LIN, and power is supplied to the power reception side resonance coil L2 in a contactless manner by magnetic field resonance. Is transmitted.

受電側共振コイルL2は、送電側共振コイルL1から伝送された電力を受電したら、電磁誘導により受電側給電コイルLOUTへ伝送する。こうして受電側給電コイルLOUTが受電した電力は、整流部22で直流に変換されて負荷23に供給される。   When receiving the power transmitted from the power transmission side resonance coil L1, the power reception side resonance coil L2 transmits the power to the power reception side power supply coil LOUT by electromagnetic induction. The power received by the power receiving coil LOUT in this way is converted into direct current by the rectifier 22 and supplied to the load 23.

ここで、電力の伝送効率を見ると、送電側共振コイルL1と受電側共振コイルL2との間の結合度は、共振コイル間の距離d(ここでは、送電側共振コイルL1と受電側共振コイルL2との間の距離Lm)により変化し、近づけるほど伝送効率は高くなるが、一定距離以上に近づけると逆に利得が急激に低下する。これは、共振コイル間の距離が短すぎると反射電力が増加して共振周波数が1つの単峰特性から2つに分離する双峰特性に変化することによるためで、伝送周波数が固定されている状況で高い伝送効率を維持するには、この固定された伝送周波数に単峰特性のピークを持ってくることになる。   Here, looking at the power transmission efficiency, the degree of coupling between the power transmission side resonance coil L1 and the power reception side resonance coil L2 is the distance d between the resonance coils (here, the power transmission side resonance coil L1 and the power reception side resonance coil). The transmission efficiency increases as the distance is closer to L2, and the closer the distance is to a certain distance, the gain is drastically decreased. This is because if the distance between the resonance coils is too short, the reflected power increases, and the resonance frequency changes from a single unimodal characteristic to a bimodal characteristic that separates into two, so the transmission frequency is fixed. In order to maintain a high transmission efficiency in the situation, a peak with a single peak characteristic is brought to this fixed transmission frequency.

しかしながら、共振コイル間の距離を一定にできず、取り付け状況或いは使用状態によって距離が変わり、双峰特性が発生する距離まで接近する状況が発生する場合は、次のような制御により負荷23に供給する電力の減少を防止する。
まず方向性結合器33により、電力増幅部32から送電コイル部13に送出される進行波電力に比例する信号と、送電コイル部13から反射する反射波電力に基づく(比例する)信号とを取り出し、両者の差分を差動増幅部35で抽出する。そして、この差分情報を基に出力制御部36が電力増幅部32の増幅率を制御する。
However, when the distance between the resonant coils cannot be made constant, and the distance changes depending on the mounting state or usage state, and a situation in which the distance to the bimodal characteristic occurs is generated, the load 23 is supplied by the following control. To prevent a decrease in power.
First, the directional coupler 33 takes out a signal proportional to the traveling wave power transmitted from the power amplification unit 32 to the power transmission coil unit 13 and a signal based on (proportional to) the reflected wave power reflected from the power transmission coil unit 13. The difference between the two is extracted by the differential amplifier 35. Based on this difference information, the output control unit 36 controls the amplification factor of the power amplification unit 32.

具体的に出力制御部36は、差分が大きければ反射電力が小さいと判断し、即ち受電コイル部21は良好に電力を受電していると判断し、電力増幅部32の増幅率を所定の増幅率で一定とする。一方、共振コイル間の距離が近いにも拘わらず差分が小さくなったら、共振周波数が双峰特性に変化して反射電力が増加したと判断し、電力増幅部32の増幅率を所定の増幅率より大きくし、受電コイル部21が受信する電力を増加させる。
詳しくは、差動増幅部35が出力する差分情報と、電力増幅部32が出力する電力情報から受電装置2が受電する電力を推定して、一定の電力が伝送されるよう電力増幅部32の増幅率を制御する。この結果、負荷23には一定の電力を供給が成される。
Specifically, the output control unit 36 determines that the reflected power is small if the difference is large, that is, determines that the power receiving coil unit 21 is receiving power satisfactorily, and increases the amplification factor of the power amplification unit 32 by a predetermined amplification. The rate is constant. On the other hand, if the difference becomes small despite the distance between the resonance coils being short, it is determined that the resonance frequency has changed to a bimodal characteristic and the reflected power has increased, and the amplification factor of the power amplification unit 32 is set to a predetermined amplification factor. The power received by the power receiving coil unit 21 is increased.
Specifically, the power received by the power receiving device 2 is estimated from the difference information output from the differential amplifier 35 and the power information output from the power amplifier 32, so that a certain amount of power is transmitted. Control the gain. As a result, a constant power is supplied to the load 23.

但し、出力制御部36は、遅延制御するためのタイマ36aを備えており、反射波電力が増加したと判断しても、タイマ36aを起動して一定時間(例えば3秒)をカウントし、一定時間が経過してタイムアップしても引き続き反射波電力の増加が認められたら、その時点で電力増幅部32の増幅率を大きくする。   However, the output control unit 36 includes a timer 36a for delay control, and even if it is determined that the reflected wave power has increased, the timer 36a is activated and counts for a certain time (for example, 3 seconds). If the reflected wave power continues to increase even after the time has elapsed, the amplification factor of the power amplifying unit 32 is increased at that time.

このように、送電コイル部13と受電コイル部21とが設定された距離より接近して、電力の伝送効率が低下しても、電力増幅部32が出力する電力が増加するため、受電電力の低下を防止できる。
また、送電コイル部13と受電コイル部21の接近等で反射波電力が増加しても、一定時間遅延動作させて瞬時に送電電力を増加させないため、送電コイル部13と受電コイル部21との突発的な接近等による急激な電力変動を防止でき、不安定な状態となる制御を防止でき、安定したワイヤレス送電を実施できる。
Thus, even if the power transmission coil unit 13 and the power reception coil unit 21 are closer than the set distance and the power transmission efficiency is reduced, the power output from the power amplification unit 32 is increased. Decline can be prevented.
Further, even if the reflected wave power increases due to the proximity of the power transmission coil unit 13 and the power reception coil unit 21 or the like, the power transmission power is not increased instantaneously by performing a delay operation for a certain time. Sudden power fluctuations due to sudden approach or the like can be prevented, control that becomes unstable can be prevented, and stable wireless power transmission can be performed.

図3は、上記ワイヤレス電力伝送システムを組み込んだイヤレスインターホンシステムを示している。ワイヤレスインターホンシステムは、図3に示すように来訪者が居住者を呼び出すための玄関子機4と、呼び出しを受けて居住者が応答するための居室親機5とで構成され、両者はアンテナ41、51を有して無線通信により通話路が形成される。
玄関子機4は、呼出ボタン42に加えて来訪者を撮像するカメラ43を備え、居室親機5は応答するための通話ボタン52と、カメラ43の撮像映像を表示するモニタ53を備えている。尚、両者は通話のためのマイク及びスピーカを備えているが省略している。
FIG. 3 shows an earless intercom system incorporating the wireless power transmission system. As shown in FIG. 3, the wireless intercom system is composed of an entrance handset 4 for a visitor to call a resident and a living room base unit 5 for the resident to answer the call, both of which are antennas 41. , 51 is formed by wireless communication.
In addition to the call button 42, the entrance unit 4 includes a camera 43 that images a visitor, and the room base unit 5 includes a call button 52 for responding and a monitor 53 that displays an image captured by the camera 43. . Both are provided with a microphone and a speaker for calling, but are omitted.

そして、玄関子機4は上述したワイヤレス電力伝送システムを構成する受電装置2を具備して、玄関子機の背部(玄関子機4が設置された壁面の反対側)に、玄関子機4に電力を送電するための送電装置1が設置され、ワイヤレスで電源の供給を受けている。尚、居室親機5は室内のコンセント等に接続されて商用電源が供給される。   The entrance cordless handset 4 includes the power receiving device 2 that constitutes the above-described wireless power transmission system, and the entrance cordless handset 4 is connected to the back of the entrance cordless handset (the side opposite to the wall surface on which the entrance cordless handset 4 is installed). A power transmission device 1 for transmitting power is installed and wirelessly supplied with power. The living room base unit 5 is connected to an indoor outlet or the like and supplied with commercial power.

図4は玄関子機4と送電装置1の関係を示す説明図であり、縦断面を示している。図4に示すように、住戸の壁面Wの外側に取り付けられた玄関子機4に対して、住戸内となる壁面Wの裏側に送電装置1が取り付けられている。
そして、玄関子機4は、通話のためのマイク、スピーカ(何れも図示せず)に加えて、カメラ43の撮像回路や通話回路等が組み付けられた回路基板44、受電装置2等が組み込まれており、玄関子機ケース4bの奥部となる背面側に受電装置2の受電コイル部21が配置され、回路基板44はその前側に配置されている。
また、回路基板44と受電コイル部21との間には、回路基板44を受電コイル部21の漏れ磁束からシールドするための磁性体から成るシート45が配置されている。
FIG. 4 is an explanatory diagram showing the relationship between the entrance cordless handset 4 and the power transmission device 1 and shows a longitudinal section. As shown in FIG. 4, the power transmission device 1 is attached to the back side of the wall surface W in the dwelling unit with respect to the entrance cordless handset 4 attached to the outside of the wall surface W of the dwelling unit.
In addition to the microphone and speaker (both not shown) for the telephone, the front door device 4 incorporates a circuit board 44 on which an imaging circuit, a communication circuit, etc. of the camera 43 are assembled, the power receiving device 2, and the like. The power receiving coil portion 21 of the power receiving device 2 is disposed on the back side, which is the back of the front door case 4b, and the circuit board 44 is disposed on the front side thereof.
Further, a sheet 45 made of a magnetic material for shielding the circuit board 44 from the leakage magnetic flux of the power receiving coil part 21 is disposed between the circuit board 44 and the power receiving coil part 21.

このように、玄関子機4は無線で電力が供給されるため、電源線が必要がない。そのため、壁面Wに電源線等の配線を挿通するための孔を設ける必要が無く、設置が容易となる。また、壁が薄いことで玄関子機4と送電装置1が設定値より接近した状態で設置されても、玄関子機4の受電コイル部21が受信する電力が低下しないよう送電電力の大きさが制御されるため、住戸によって或いは取り付ける壁面の状態によって玄関子機4と送電装置1の距離が変わっても玄関子機4を良好に動作させることができ、壁面Wの厚みを気にすることなく玄関子機4を設置できる。
また、回路基板44と受電コイル部21との間には磁性体から成るシート45が配置されているため、受電装置2の受電コイル部21で発生する漏れ磁束が通話のための回路へ悪影響を及ぼすのを防止でき、誤動作やノイズの発生を防止できる。
Thus, since the entrance cordless handset 4 is supplied with power wirelessly, a power line is not necessary. Therefore, it is not necessary to provide a hole for inserting a wiring such as a power supply line in the wall surface W, and the installation is facilitated. Moreover, even if the entrance cordless handset 4 and the power transmission device 1 are installed closer to the set value due to the thin wall, the magnitude of the transmitted power is set so that the power received by the power receiving coil unit 21 of the entrance cordless handset 4 does not decrease. Therefore, even if the distance between the entrance cordless handset 4 and the power transmission device 1 changes depending on the dwelling unit or the state of the wall surface to be attached, the entrance cordless handset 4 can be operated well, and the thickness of the wall surface W is concerned. The entrance cordless handset 4 can be installed.
In addition, since a sheet 45 made of a magnetic material is disposed between the circuit board 44 and the power receiving coil unit 21, the leakage magnetic flux generated in the power receiving coil unit 21 of the power receiving device 2 has an adverse effect on the communication circuit. Can be prevented, and malfunction and noise can be prevented.

尚、上記実施形態では、高周波電源部12が出力する電力の周波数を、例えば13.56MHzとしているが、6MHz以上であれば住戸の壁面程度の間隔を設けた状態で磁界共振結合方式により良好に電力を伝送することが可能であり、ISMバンドの周波数帯を利用できる。   In the above embodiment, the frequency of the power output from the high frequency power supply unit 12 is set to 13.56 MHz, for example. However, if the frequency is 6 MHz or more, the magnetic field resonance coupling method is preferable in a state where the interval is about the wall of the dwelling unit. Electric power can be transmitted, and the frequency band of the ISM band can be used.

図5はワイヤレスインターホンシステムの他の例を示す概略図であり、玄関子機4aと来訪者が携行する携帯端末6を示している。居室親機は上記図3と同様であるため省略している。この形態では、壁面Wの内側に配置した送電装置1から玄関子機4aが電力の供給を受けるのではなく、玄関子機4aを操作する来訪者の接近を受けて玄関子機4aが起動するよう構成されている。   FIG. 5 is a schematic view showing another example of the wireless intercom system, and shows the entrance terminal 4a and the portable terminal 6 carried by a visitor. The room master is omitted because it is the same as FIG. In this form, the entrance cordless handset 4a does not receive the supply of power from the power transmission device 1 arranged inside the wall surface W, but the entrance cordless handset 4a is activated in response to a visitor operating the entrance cordless handset 4a. It is configured as follows.

この形態では、玄関子機4aの基本構成は上記図4に示す玄関子機4と同様であるが、図4に示す構造とは受電コイル部21と回路基板44の配置が逆となってい点が相違している。受電コイル部21が前面側に配置され、回路基板44が奥部である壁面W側に配置され、両者の間に磁性体から成るシート45(図示せず)が配置されている。
一方、来訪者が携行する携帯端末6は、情報表示部61、通話部を備えて携帯電話としての機能に加えて、上述した送電装置1を具備している。
In this embodiment, the basic configuration of the entrance cordless handset 4a is the same as that of the entrance cordless handset 4 shown in FIG. 4, but the arrangement of the receiving coil portion 21 and the circuit board 44 is opposite to the structure shown in FIG. Is different. The power receiving coil portion 21 is disposed on the front surface side, the circuit board 44 is disposed on the wall surface W side which is the back portion, and a sheet 45 (not shown) made of a magnetic material is disposed therebetween.
On the other hand, a mobile terminal 6 carried by a visitor includes an information display unit 61 and a call unit, and includes the above-described power transmission device 1 in addition to the function as a mobile phone.

このような構成とすることで、待受時の玄関子機4aは電源の供給を受けないため停止状態にあるが、携帯端末6を携行している来訪者が玄関子機4aを操作するために玄関子機4aに近づくと、送電装置1も受電装置2に接近するため、玄関子機4aに電力が供給されて起動する。その結果、呼出操作が可能となり、呼出操作すると呼出信号が居室親機5に無線送信され、応答操作を受けて通話が可能となる。   With such a configuration, the entrance cordless handset 4a at the time of standby is in a stopped state because it is not supplied with power, but a visitor carrying the mobile terminal 6 operates the entrance cordless handset 4a. Since the power transmission device 1 also approaches the power receiving device 2 when approaching the entrance device 4a, power is supplied to the entrance device 4a and the device is activated. As a result, a call operation becomes possible. When the call operation is performed, a call signal is wirelessly transmitted to the room master unit 5, and a call can be made in response to a response operation.

このように、待受時は玄関子機4aに電源が供給されないが、送電装置1を内蔵した携帯端末6を携行する来訪者が居住者を呼び出すために接近すると、玄関子機4aに電源が供給されて起動する。よって、電源線を配設することなく呼出操作が可能であり、玄関子機4aの設置が容易であるし、省電力に構成できる。
また、回路基板44と受電コイル部21との間には磁性体から成るシート45が配置されているため、受電装置2の受電コイル部21で発生する漏れ磁束が通話のための回路へ悪影響を及ぼすのを防止でき、誤動作やノイズの発生を防止できる。
As described above, power is not supplied to the entrance cordless handset 4a during standby, but when a visitor carrying the portable terminal 6 with the built-in power transmission device 1 approaches to call a resident, the entrance cordless handset 4a is powered on. Supplied and activated. Therefore, the calling operation can be performed without providing the power line, the installation of the front door 4a is easy, and the power can be saved.
In addition, since a sheet 45 made of a magnetic material is disposed between the circuit board 44 and the power receiving coil unit 21, the leakage magnetic flux generated in the power receiving coil unit 21 of the power receiving device 2 has an adverse effect on the communication circuit. Can be prevented, and malfunction and noise can be prevented.

尚、携帯端末6でなくバッテリーを電源とした送電装置1そのものを来訪者に携行させても良い。   In addition, you may make a visitor carry the power transmission apparatus 1 itself which used the battery instead of the portable terminal 6 as a power supply.

1・・送電装置、2・・受電装置、4,4a・・玄関子機、4b・・玄関子機ケース、5・・居室親機、6・・携帯端末、11・・直流電源、12・・高周波電源部、13・・送電コイル部、21・・受電コイル部、23・・負荷、32・・電力増幅部、33・・方向性結合器、34・・直線検波器、35・・差動増幅部、36・・出力制御部、36a・・タイマ、44・・回路基板、45・・シート(磁性体シート)、51・・アンテナ、LIN・・送電側給電コイル、L1・・送電側共振コイル、L2・・受電側共振コイル、LOUT・・受電側給電コイル、W・・壁面(住戸壁面)。   1 .. Power transmission device 2.. Power reception device 4, 4 a. Entrance slave unit 4 b. Entrance slave unit case 5.・ High frequency power supply unit, 13 ..Power transmission coil unit, 21 ..Receiving coil unit, 23 ..Load, 32 ..Power amplification unit, 33 ..Directional coupler, 34 ..Linear detector, 35. Dynamic amplifier 36, Output controller 36a, Timer 44, Circuit board 45, Sheet (magnetic sheet) 51, Antenna, LIN Power transmission coil L1, Power transmission Resonance coil, L2 ·· Receiving side resonance coil, LOUT ·· Receiving side feeding coil, W ·· Wall surface (dwelling unit wall surface).

Claims (5)

伝送する電力を生成する高周波電源部、及びワイヤレス送電するための送電側共振コイルを有する送電コイル部を備えた送電装置と、前記送電側共振コイルから送電された電力を受電するための受電側共振コイルを有する受電コイル部を備えた受電装置とを有して、6MHz以上の周波数を使用した磁界共振結合方式により、前記送電装置から前記受電装置に電力を伝送するワイヤレス電力伝送システムであって、
前記高周波電源部は、伝送する電力を増幅する電力増幅部と、
前記電力増幅部から前記送電コイル部に送出される進行波電力、及び前記送電コイル部から反射する反射波電力を検出するための方向性結合器と、
前記方向性結合器の検出値から前記反射波電力の増減を検出するための差動増幅部と、
前記差動増幅部の出力を基に前記電力増幅部を制御する出力制御部とを有し、
前記出力制御部は、前記差動増幅部の出力から反射波電力の増加を検出したら、前記電力増幅部の出力を増大させることを特徴とするワイヤレス電力伝送システム。
A power transmission device including a high-frequency power supply unit that generates power to be transmitted, a power transmission coil unit having a power transmission side resonance coil for wireless power transmission, and a power reception side resonance for receiving power transmitted from the power transmission side resonance coil A wireless power transmission system for transmitting power from the power transmitting device to the power receiving device by a magnetic resonance coupling method using a power receiving device having a power receiving coil unit having a coil and using a frequency of 6 MHz or more,
The high frequency power supply unit includes a power amplification unit that amplifies power to be transmitted,
A directional coupler for detecting traveling wave power sent from the power amplifier to the power transmission coil unit and reflected wave power reflected from the power transmission coil unit;
A differential amplifier for detecting an increase or decrease in the reflected wave power from a detection value of the directional coupler;
An output control unit that controls the power amplification unit based on the output of the differential amplification unit;
When the output control unit detects an increase in reflected wave power from the output of the differential amplification unit, the output control unit increases the output of the power amplification unit.
前記出力制御部は、前記反射波電力の増加を検出しても前記電力増幅部の出力増大を一定時間遅延させるためのタイマを有し、前記タイマがタイムアップしても引き続き前記反射波電力の増加を検出したら、前記電力増幅部の出力を増大させることを特徴とする請求項1記載のワイヤレス電力伝送システム。   The output control unit has a timer for delaying the increase in the output of the power amplification unit for a predetermined time even when the increase in the reflected wave power is detected. The wireless power transmission system according to claim 1, wherein when an increase is detected, an output of the power amplification unit is increased. 来訪者が居住者を呼び出すために屋外の住戸壁面に設置された玄関子機と、前記玄関子機からの呼び出しに応答するための居室親機とを有し、前記玄関子機と前記居室親機との間の通信が無線で成されるワイヤレスインターホンシステムであって、
前記玄関子機に前記請求項1又は2に記載のワイヤレス電力伝送システムを適用し、前記玄関子機内にワイヤレス電力伝送システムの受電装置を配置すると共に、前記玄関子機の背部となる前記住戸壁面の裏面に、前記ワイヤレス電力伝送システムの送電装置を配置し、
前記住戸壁面を介して前記送電装置から送電される電力で前記玄関子機が動作することを特徴とするワイヤレスインターホンシステム。
An entrance cordless handset installed on the wall surface of an outdoor dwelling unit for a visitor to call a resident, and a living room base phone for responding to a call from the entrance cordless handset, wherein the entrance cordless handset and the living room parent A wireless intercom system in which communication with the machine is performed wirelessly,
The wireless power transmission system according to claim 1 or 2 is applied to the entrance unit, a power receiving device of the wireless power transmission system is disposed in the entrance unit, and the wall surface of the dwelling unit serving as a back portion of the entrance unit The power transmission device of the wireless power transmission system is disposed on the back surface of
The wireless intercom system, wherein the entrance cordless handset operates with electric power transmitted from the power transmission device via the dwelling unit wall surface.
来訪者が居住者を呼び出すために屋外の住戸壁面に設置された玄関子機と、前記玄関子機からの呼び出しに応答するための居室親機とを有し、前記玄関子機と前記居室親機との間の通信が無線で成されるワイヤレスインターホンシステムであって、
前記玄関子機に前記請求項1又は2に記載のワイヤレス電力伝送システムを適用し、前記玄関子機内にワイヤレス電力伝送システムの受電装置を配置すると共に、ワイヤレス電力伝送システムの送電装置或いは当該送電装置を内蔵した携帯端末を来訪者が携行し、来訪者が前記玄関子機に接近することで前記玄関子機に前記送電装置から電源が供給されて呼出操作が可能となることを特徴とするワイヤレスインターホンシステム。
An entrance cordless handset installed on the wall surface of an outdoor dwelling unit for a visitor to call a resident, and a living room base phone for responding to a call from the entrance cordless handset, wherein the entrance cordless handset and the living room parent A wireless intercom system in which communication with the machine is performed wirelessly,
The wireless power transmission system according to claim 1 or 2 is applied to the entrance unit, a power receiving device of the wireless power transmission system is disposed in the entrance unit, and a power transmission device of the wireless power transmission system or the power transmission device A wireless terminal in which a visitor carries a portable terminal with a built-in mobile phone, and when the visitor approaches the entrance cordless handset, power is supplied to the entrance cordless handset from the power transmission device to enable a call operation. Intercom system.
前記玄関子機に設置されたワイヤレス電力伝送システムの受電コイル部と、通話のための回路が組み付けられた回路基板との間には、前記受電コイル部で発生する漏れ磁束から前記回路基板をシールドするための磁性体シートが配置されて成ることを特徴とする請求項3又は4記載のワイヤレスインターホンシステム。   The circuit board is shielded from leakage magnetic flux generated in the power receiving coil section between a power receiving coil section of the wireless power transmission system installed in the entrance unit and a circuit board on which a circuit for communication is assembled. 5. A wireless intercom system according to claim 3 or 4, wherein a magnetic sheet is arranged.
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