WO2015097807A1 - 共振型送信電源装置及び共振型送信電源システム - Google Patents
共振型送信電源装置及び共振型送信電源システム Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/05—Circuit arrangements or systems for wireless supply or distribution of electric power using capacitive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
Definitions
- the present invention relates to a resonance-type transmission power supply apparatus and a resonance-type transmission power supply system that detect the presence or absence of foreign matter in an electromagnetic field generated from a transmission antenna and reduce or stop power transmission when the foreign matter is detected.
- a conventional power supply device having a function of detecting the presence or absence of a foreign substance is known (see, for example, Patent Document 1).
- a plurality of sensor coils 102 whose winding axes are orthogonal to the transmission antenna 101 are provided (only one is shown in FIG. 6), and foreign matter existing around 103 of the sensor coil 102. Is detected.
- the receiving antenna (not shown) side is configured in the same manner.
- the sensor coil 102 for detecting a foreign object is provided separately from the transmission antenna 101 and the reception antenna, and thus has the following problems.
- the present invention has been made to solve the above-described problems, and can detect the presence or absence of a foreign object in an electromagnetic field generated from a transmitting antenna, and reduce or stop power transmission when a foreign object is detected. It is an object of the present invention to provide a resonant transmission power supply apparatus and a resonant transmission power supply system that can perform the above.
- a resonance-type transmission power supply includes a transmission power state detection circuit that detects a transmission power state of a transmission antenna, and a foreign object in an electromagnetic field generated from the transmission antenna based on a detection result by the transmission power state detection circuit.
- a foreign matter detection circuit for detecting presence / absence and a power control circuit for reducing or stopping the supply of power to the transmission antenna when a foreign matter is detected by the foreign matter detection circuit.
- the present invention since it is configured as described above, it is possible to detect the presence or absence of foreign matter in the electromagnetic field generated from the transmission antenna, and to reduce or stop power transmission when a foreign matter is detected. .
- FIG. 1 is a diagram showing a configuration of a resonant power transmission system including a resonant transmission power supply apparatus 1 according to Embodiment 1 of the present invention.
- a resonance type power transmission system transmits electric power including an electric signal.
- the resonance type power transmission system includes a resonance type transmission power supply device 1, a transmission antenna 2, a reception antenna 3, and a reception power supply device 4.
- the resonant transmission power supply device 1 is disposed in front of the transmission antenna 2 and controls the supply of power to the transmission antenna 2.
- the resonant transmission power supply apparatus 1 detects the presence or absence of foreign matter in an electromagnetic field (a space including the power transmission space between the transmission / reception antennas 2 and 3 and the vicinity thereof) generated from the transmission antenna 2 indicated by a broken line in FIG. It also has a function and a function of reducing or stopping the supply of power to the transmission antenna 2 when a foreign object is detected.
- Foreign substances include dielectric foreign substances (human hands, animals, etc.) and magnetic foreign substances (metals, etc.). Details of the resonant transmission power supply device 1 will be described later.
- the transmission antenna 2 transmits power from the resonant transmission power supply device 1 to the reception antenna 3 (not limited to non-contact).
- the receiving antenna 3 receives power from the transmitting antenna 2 (not limited to non-contact).
- the power received by the receiving antenna 3 is supplied to a load device or the like (not shown) via the receiving power supply device 4.
- the reception power supply device 4 is disposed between the reception antenna 3 and a load device or the like, and rectifies the electric power (AC output) received by the reception antenna 3.
- the reception power supply device 4 is an AC input-DC output type or AC input-AC output type power supply circuit. Note that the transmission method of the resonant power transmission system in the case of wireless power transmission is not particularly limited, and any of a magnetic field resonance method, an electric field resonance method, and an electromagnetic induction method may be used.
- the resonance-type transmission power supply device 1 includes a transmission power state detection circuit 11 and a power supply control circuit 12.
- the transmission power state detection circuit 11 detects the transmission power state of the transmission antenna 2.
- the transmission power state detection circuit 11 includes a reflected power detection circuit 111, a voltage detection circuit 112, a current detection circuit 113, and a phase / amplitude detection circuit 114.
- the reflected power detection circuit 111 detects power (reflected power) that returns without being able to transmit power from the transmission antenna 2.
- the voltage detection circuit 112 detects a voltage input to the transmission antenna 2.
- the current detection circuit 113 detects a current input to the transmission antenna 2.
- the phase / amplitude detection circuit 114 detects the phase difference between the voltage detected by the voltage detection circuit 112 and the current detected by the current detection circuit 113, and the amplitudes of the voltage and current.
- the power supply control circuit 12 detects the presence or absence of foreign matter in the electromagnetic field generated from the transmission antenna 2 based on the detection result by the transmission power state detection circuit 11, and supplies power to the transmission antenna 2 when the foreign matter is detected. Reduce or stop.
- the power supply control circuit 12 includes an inverter circuit 121 that outputs a high-frequency alternating current and a control circuit 122 that controls the output.
- the inverter circuit 121 is an AC input-AC output type or DC input-AC output type inverter power supply circuit.
- the control circuit 122 includes a control pattern storage circuit 123, a foreign object detection circuit 124, and a power control circuit 125.
- the control pattern storage circuit 123 is a memory that stores information related to foreign object detection and power control.
- the information stored in the control pattern storage circuit 123 includes a threshold for a transmission power state (reflected power, phase difference between voltage and current, and each amplitude of voltage and current) used when the foreign object detection circuit 124 performs foreign object detection.
- Information indicating the type of foreign object (dielectric system, magnetic system) that can be detected using the transmission power state, and control content in the power control circuit 125 according to the type of foreign object (in the case of a foreign object of dielectric system) Includes information indicating that the power supply is stopped, and in the case of a magnetic foreign object, the power supply is reduced.
- the foreign object detection circuit 124 detects the presence or absence of foreign objects in the electromagnetic field generated from the transmission antenna 2 based on the detection result by the transmission power state detection circuit 11 according to the information stored in the control pattern storage circuit 123. .
- the power control circuit 125 reduces or stops the supply of power to the transmission antenna 2 according to the information stored in the control pattern storage circuit 123 when a foreign object is detected by the foreign object detection circuit 124.
- the operation of the resonant transmission power supply device 1 configured as described above will be described with reference to FIGS.
- AC or DC power is supplied to the power supply control circuit 12 of the resonant transmission power supply apparatus 1, and the inverter circuit 121 of the power supply control circuit 12 supplies a high-frequency AC output to the transmission antenna 2.
- the power supplied to the transmission antenna 2 resonates with the AC frequency and is transmitted from the transmission antenna 2 to the reception antenna 3.
- the power received by the receiving antenna 3 is AC output to the receiving power supply device 4.
- the receiving power supply device 4 rectifies the electric power and outputs DC or AC.
- the transmission power state of the transmission antenna 2 is detected by the transmission power state detection circuit 11, and a signal indicating the state is sent to the power supply control circuit 12.
- the control circuit 122 of the power supply control circuit 12 controls the AC output to the transmission antenna 2 by detecting the presence or absence of foreign matter in the electromagnetic field generated from the transmission antenna 2 based on the signal.
- the waveform is as shown in FIG. That is, as shown in the upper part of FIG. 2, the power transmission is interrupted by the foreign matter, so that the reflected power increases compared to the case where there is no foreign matter. Further, as shown in the lower part of FIG. 2, the phase difference between the voltage and the current increases, and the amplitudes of the voltage and current change. And the power supply control circuit 12 stops supply of the electric power to the transmission antenna 2, for example, when detecting the foreign material of a dielectric system. Further, when a magnetic foreign substance (metal or the like) is present in the electromagnetic field generated from the transmitting antenna 2, the waveform is as shown in FIG.
- the power supply control circuit 12 reduces supply of the electric power to the transmission antenna 2, for example, when detecting the foreign material of a magnetic system.
- the transmitting and receiving antennas 2 and 3 can be made small and light.
- an additional device such as the sensor coil 102 is unnecessary, cost reduction can be achieved.
- power consumption can be reduced.
- the transmission power state detection circuit 11 shown in FIG. 1 the transmission power state is shown as a case where the reflected power, the phase difference between voltage and current, and each amplitude of voltage and current are detected.
- the present invention is not limited to this.
- the detection items may be deleted, although the foreign matter detection accuracy is reduced.
- the transmission power state detection circuit 11 shown in FIG. 1 can be shared as a detection circuit for adjusting the resonance coupling impedance of the transmission / reception antennas 2 and 3 according to the change of the input impedance of the reception antenna 3, and is low in cost. Can be achieved.
- a resonance impedance adjustment circuit for adjusting the resonance impedance of the transmission antenna 2 (adjusting the resonance condition between the transmission and reception antennas 2 and 3) based on the detection result by the transmission power state detection circuit 11 is separately provided.
- FIG. 4 is a diagram showing a configuration of a resonant power transmission system including a resonant transmission power supply system according to Embodiment 2 of the present invention.
- the resonant power transmission system according to the second embodiment shown in FIG. 4 is provided with two transmission / reception systems of the resonant power transmission system according to the first embodiment shown in FIG.
- a position detection circuit 126 is added. Moreover, the power supply control circuits 12 of each system are connected by a connection line, and the detection result by each transmission power state detection circuit 11 can be shared. Other configurations are the same, and only the different parts are described with the same reference numerals.
- the position detection circuit 126 detects the position of the foreign object based on the detection result (waveform difference) by the transmission power state detection circuit 11 of each system. Further, the power control circuit 125 reduces or stops the supply of power to the corresponding transmitting antenna 2 based on the position of the foreign object detected by the position detection circuit 126.
- FIG. Embodiment 3 shows a case where a plurality of transmission / reception systems are provided and power transmission is performed at different fixed frequencies.
- FIG. 5 is a diagram showing a configuration of a resonant power transmission system including a resonant transmission power supply system according to Embodiment 3 of the present invention.
- the basic configuration of the resonant power transmission system according to the third embodiment shown in FIG. 5 is the same as that of the resonant power transmission system according to the second embodiment shown in FIG. Only explain.
- each said frequency band is a frequency band used with a commercial power source.
- the power control circuit 125 uses the fixed frequency of the transmission antenna 2 of each system and the detection result (the difference in waveform) by the transmission power state detection circuit 11 of each system. Based on the type of foreign matter, the power supply to the corresponding transmitting antenna 2 is reduced or stopped.
- the reflectance with respect to the power transmitted at a specific transmission frequency differs depending on the type of foreign matter (dielectric system, magnetic system). Therefore, by using this characteristic, it is possible to more accurately determine whether the foreign substance is a dielectric system or a magnetic system, and the detection accuracy is improved.
- the resonant transmission power supply apparatus can detect the presence or absence of foreign matter in the electromagnetic field generated from the transmission antenna, and can reduce or stop power transmission when the foreign matter is detected. It is suitable for use in a resonance type transmission power supply device for controlling the supply of power to the power source.
- 1 resonance type transmission power supply device 2 transmission antenna, 3 reception antenna, 4 reception power supply device, 11 transmission power state detection circuit, 12 power control circuit, 111 reflected power detection circuit, 112 voltage detection circuit, 113 current detection circuit, 114 phase / Amplitude detection circuit, 121 inverter circuit, 122 control circuit, 123 control pattern storage circuit, 124 foreign object detection circuit, 125 power control circuit, 126 position detection circuit.
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Abstract
Description
実施の形態1.
図1はこの発明の実施の形態1に係る共振型送信電源装置1を備えた共振型電力伝送システムの構成を示す図である。
共振型電力伝送システムは、電気信号を含む電力を伝送するものである。この共振型電力伝送システムは、図1に示すように、共振型送信電源装置1、送信アンテナ2、受信アンテナ3及び受信電源装置4から構成されている。
送信アンテナ2は、共振型送信電源装置1からの電力を、受信アンテナ3に伝送するものである(非接触に限定されない)。
受信電源装置4は、受信アンテナ3と負荷機器等間に配置され、受信アンテナ3により受信された電力(交流出力)を整流するものである。この受信電源装置4は、AC入力-DC出力型又はAC入力-AC出力型の電源回路である。
なお、無線電力伝送の場合における共振型電力伝送システムの伝送方式は特に限定されるものではなく、磁界共鳴による方式、電界共鳴による方式、電磁誘導による方式のいずれであってもよい。
共振型送信電源装置1は、送信電力状態検出回路11及び電源制御回路12から構成されている。
電圧検出回路112は、送信アンテナ2に入力される電圧を検出するものである。
電流検出回路113は、送信アンテナ2に入力される電流を検出するものである。
位相/振幅検出回路114は、電圧検出回路112により検出された電圧と電流検出回路113により検出された電流との位相差、電圧及び電流の各振幅を検出するものである。
電力制御回路125は、異物検出回路124により異物が検出された場合に、制御パターン記憶回路123に記憶された情報に従い、送信アンテナ2への電力の供給を低減又は停止するものである。
共振型電力伝送システムでは、AC又はDC電力が共振型送信電源装置1の電源制御回路12に供給され、電源制御回路12のインバータ回路121は高周波の交流出力を送信アンテナ2へ供給する。送信アンテナ2へ供給された電力は、その交流周波数に共振して、送信アンテナ2から受信アンテナ3へ伝送される。受信アンテナ3で受信された電力は、受信電源装置4へ交流出力される。そして、受信電源装置4は、その電力を整流して、DC又はAC出力する。
一方、共振型送信電源装置1では、送信アンテナ2の送信電力状態を、送信電力状態検出回路11により検出し、電源制御回路12へその状態を示す信号を送っている。そして、電源制御回路12の制御回路122では、その信号に基づいて、送信アンテナ2から発生される電磁界における異物の有無を検出することで、送信アンテナ2への交流出力を制御している。
また、送信アンテナ2から発生される電磁界に磁性体系の異物(金属等)が存在する場合には、図3(b)に示すような波形となる。すなわち、図3の上段に示すように、異物により電力伝送が遮られるため、異物がない場合に対して反射電力が増加する。また、図3の下段に示すように、電圧と電流との位相差が変化し、電圧の振幅が増加し、電流の振幅が減少する。そして、電源制御回路12は、磁性体系の異物を検出した場合には、例えば送信アンテナ2への電力の供給を低減する。
また、異物検出において従来構成のような異物検出用のセンサコイル102等が不要なため、送受信アンテナ2,3を小型・軽量に構成することができる。また、送信アンテナ2から発生される電磁界における送信アンテナ2から離れた遠方、又は送受信アンテナ2,3の中心付近に存在する異物も検出することができる。また、センサコイル102等の追加装置が不要なため、低コスト化を図ることができる。また、センサコイル102等の追加装置を駆動する必要もないため、低消費電力化を図ることができる。
実施の形態2では、送受信系(共振型送信電源装置1、送信アンテナ2及び受信アンテナ3)を複数系統設け、各々逆位相かつ同一の固定周波数で電力伝送を行う場合について示す。なおこの場合、複数系統の共振型送信電源装置1は本発明の共振型送信電源システムを構成する。図4はこの発明の実施の形態2に係る共振型送信電源システムを備えた共振型電力伝送システムの構成を示す図である。図4に示す実施の形態2に係る共振型電力伝送システムは、図1に示す実施の形態1に係る共振型電力伝送システムの送受信系を2系統設け、共振型送信電源装置1の電源制御回路12に位置検出回路126を追加したものである。また、各系統の電源制御回路12は接続線で接続されており、各送信電力状態検出回路11による検出結果を共有することができる。その他の構成は同様であり、同一の符号を付して異なる部分についてのみ説明を行う。
また、電力制御回路125は、位置検出回路126により検出された異物の位置に基づいて、対応する送信アンテナ2への電力の供給を低減又は停止する。
実施の形態3では、送受信系を複数系統設け、異なる固定周波数で電力伝送を行う場合について示す。図5はこの発明の実施の形態3に係る共振型送信電源システムを備えた共振型電力伝送システムの構成を示す図である。図5に示す実施の形態3に係る共振型電力伝送システムは、図4に示す実施の形態2に係る共振型電力伝送システムと基本構成は同様であり、同一の符号を付して異なる部分についてのみ説明を行う。
ここで、特定の伝送周波数で伝送される電力に対する反射率は、異物の種別(誘電体系、磁性体系)により異なる。よって、この特性を利用することで、異物が誘電体系であるか磁性体系であるかをより正確に判別することができ、検出精度が向上する。
Claims (7)
- 送信アンテナの送信電力状態を検出する送信電力状態検出回路と、
前記送信電力状態検出回路による検出結果に基づいて、前記送信アンテナから発生される電磁界における異物の有無を検出する異物検出回路と、
前記異物検出回路により異物が検出された場合に、前記送信アンテナへの電力の供給を低減又は停止する電力制御回路とを備えた
ことを特徴とする共振型送信電源装置。 - 前記送信電力状態検出回路は、送信電力状態として、前記送信アンテナからの反射電力、当該送信アンテナに入力される電圧と電流との位相差、当該電圧及び当該電流の各振幅のうち少なくとも1つ以上を検出する
ことを特徴とする請求項1記載の共振型送信電源装置。 - 前記送信アンテナは、受信アンテナとの間で磁界共鳴による無線電力伝送を行い、
前記送信電力状態検出回路による検出結果に基づいて、前記送信アンテナと前記受信アンテナとの間の共振条件を合わせる共振インピーダンス調整回路を備えた
ことを特徴とする請求項1記載の共振型送信電源装置。 - 前記送信アンテナは、受信アンテナとの間で電界共鳴による無線電力伝送を行い、
前記送信電力状態検出回路による検出結果に基づいて、前記送信アンテナと前記受信アンテナとの間の共振条件を合わせる共振インピーダンス調整回路を備えた
ことを特徴とする請求項1記載の共振型送信電源装置。 - 前記送信アンテナは、受信アンテナとの間で電磁誘導による無線電力伝送を行い、
前記送信電力状態検出回路による検出結果に基づいて、前記送信アンテナと前記受信アンテナとの間の共振条件を合わせる共振インピーダンス調整回路を備えた
ことを特徴とする請求項1記載の共振型送信電源装置。 - 対応する送信アンテナへの電力の供給を制御する共振型送信電源装置を複数系統備え、当該各送信アンテナが1つの固定周波数により動作する共振型送信電源システムであって、
前記共振型送信電源装置は、
前記対応する送信アンテナの送信電力状態を検出する送信電力状態検出回路と、
前記送信電力状態検出回路による検出結果に基づいて、前記対応する送信アンテナから発生される電磁界における異物の有無を検出する異物検出回路と、
前記異物検出回路により異物が検出された場合に、前記各系統の前記送信電力状態検出回路による検出結果に基づいて、当該異物の位置を検出する位置検出回路と、
前記位置検出回路により検出された異物の位置に基づいて、前記対応する送信アンテナへの電力の供給を低減又は停止する電力制御回路とを備えた
ことを特徴とする共振型送信電源システム。 - 対応する送信アンテナへの電力の供給を制御する共振型送信電源装置を複数系統備え、当該各送信アンテナが各々異なる固定周波数により動作する共振型送信電源システムであって、
前記共振型送信電源装置は、
前記対応する送信アンテナの送信電力状態を検出する送信電力状態検出回路と、
前記送信電力状態検出回路による検出結果に基づいて、前記対応する送信アンテナから発生される電磁界における異物の有無を検出する異物検出回路と、
前記異物検出回路により異物が検出された場合に、前記各系統の前記送信アンテナの固定周波数、及び前記各系統の前記送信電力状態検出回路による検出結果に基づいて異物の種別を判別し、前記対応する送信アンテナへの電力の供給を低減又は停止する電力制御回路とを備えた
ことを特徴とする共振型送信電源システム。
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US15/104,157 US10033227B2 (en) | 2013-12-26 | 2013-12-26 | Resonant type transmission power supply device and resonant type transmission power supply system |
PCT/JP2013/084836 WO2015097807A1 (ja) | 2013-12-26 | 2013-12-26 | 共振型送信電源装置及び共振型送信電源システム |
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