JP6265761B2 - Non-contact power supply system, power transmission device and power reception device - Google Patents

Description

  The present invention relates to a non-contact power feeding system that transmits power in a non-contact manner, a power transmission device and a power receiving device incorporated in the non-contact power feeding system.

  In recent years, wireless power feeding that does not use a power cord or a power feeding cable has attracted attention as a power feeding method. As main methods, a power feeding technique using electromagnetic induction, a power feeding using electromagnetic waves, and a power feeding technique using resonance (resonance) are known.

  Among these, the power feeding technology using resonance is a non-contact power feeding technology in which a pair of resonators are resonated in an electromagnetic field (near field) and fed through the electromagnetic field, and a large power of several kW is relatively long-distance. It is also possible to supply power (for example, several meters). In this method, the resonator is resonated at a specific frequency, so that power can be supplied.

  For example, Patent Literature 1 describes a wireless power feeding device and a power feeding instruction transmission device used therewith. In the transmission system described in Patent Literature 1, a power supply instruction transmission device excites a relay coil by power supply using a magnetic field resonance method, and issues a power supply instruction by opening and closing a relay contact.

JP2012-110118A

  Here, in power feeding by the magnetic field resonance method, if a high conductivity object such as metal is interposed between the resonators, the resonance condition is shifted and power feeding is not performed, so detection of a high conductivity object such as metal is detected. However, it is not suitable for detection of dielectrics and insulators such as a human body.

  For example, for a power transmission system 500 that performs power transmission by magnetic field resonance between the power transmission coil 501 and the power reception coil 502 as illustrated in FIG. 15A, as illustrated in FIG. A dielectric layer 503 is inserted between the power receiving coil 502 and the power receiving coil 502. Under such an arrangement, a transmission efficiency simulation was performed, and the result is shown in FIG. FIG. 15A shows the transmission efficiency when only the power transmission coil 501 and the power reception coil 502 are arranged and the dielectric layer 503 is not provided. The transmission efficiency is almost 1 at the designed resonance frequency. On the other hand, FIGS. 15B and 15C show the transmission efficiency when the dielectric layer 503 is inserted between the power transmission coil 501 and the power reception coil 502. Note that FIG. 15B and FIG. 15C are different in the insertion position of the dielectric layer 503.

  As apparent from FIGS. 15A to 15C described above, in any case, the transmission efficiency is almost 1, and the resonance state does not change depending on the presence or absence of the dielectric layer 503.

  Since the resonance state does not change depending on the presence or absence of the dielectric layer 503 as described above, a human body that can be regarded as the dielectric layer 503 is present in a magnetic field that resonates at a high frequency when power is supplied by magnetic field resonance. If it has intruded, the human body will continue to be supplied with resonance without being detected. Therefore, a human sensor that prevents the human body from being exposed to a high frequency magnetic field is required. Conventionally, infrared sensors, optical sensors, ultrasonic sensors, and the like have been used as human body detection methods. However, these sensors not only constantly detect and continue to consume power, but also detect minute signals, and thus have the disadvantage of malfunctioning due to ambient conditions such as ambient light and temperature. An example in which a human sensor is used is a security device around the entrance. These devices need to be wired in advance on the walls, ceilings, etc., and there are only limited places to install the security devices. There is.

  The object of the present invention has been made in view of the above-mentioned problems, and detects the presence of an object that can be regarded as a dielectric such as a human body or an animal without using a detection device, etc. It is an object of the present invention to provide a non-contact power feeding system capable of transmitting, a power transmission device and a power receiving device incorporating the non-contact power feeding system.

(First aspect)
The non-contact power feeding system according to the first aspect of the present invention is electrically connected between the first and second power transmission electrodes and the first and second power transmission electrodes arranged apart from each other. A power transmission device having an inductor, first and second power receiving electrodes that are spaced apart from each other, and an inductor that is electrically connected between the first and second power receiving electrodes. A power receiving device that can be fed by electric field resonance coupling when the frequency matches the resonance frequency of the power transmitting device, and the power feeding state changes depending on whether or not the dielectric exists at a predetermined position. The resonance characteristics of the device and the power receiving device are adjusted.

  According to the first aspect, when the dielectric is present at a predetermined position near the power transmission device or the power reception device, for example, the resonance characteristics of the power transmission device and the power reception device are changed, and the power supply state is changed.

  For example, if the electric field resonance coupling is designed in the absence of a dielectric in the vicinity of the power transmission device or the power reception device, the resonance condition shifts when the dielectric approaches the power transmission device or the power reception device, and the power supply is not fed. To change. In addition, if it is designed so that electric field resonance coupling is performed in the presence of a dielectric in the vicinity of the power transmission device or the power receiving device, it is in a non-powered state when there is no dielectric, and the dielectric moves to a predetermined position. It changes to the power supply state.

  Thus, according to the first aspect, the power transmission device and the power receiving device can be used to stop power transmission in a non-contact manner without using a detection device or the like and the dielectric is in a predetermined position. On the contrary, it is possible to start power transmission without contact.

  For example, there is a magnetic field resonance method other than electric field resonance coupling as a non-contact power transmission method, but the magnetic field resonance method uses magnetic field resonance for coupling between transmission and reception, and has a high conductivity object such as metal. Induction heating occurs. On the other hand, in the electric field resonance coupling method, even if a metal is present in the electric field, heating such as induction heating does not occur, so that power consumption does not occur and power saving can be realized.

  In addition, according to the first aspect, when electric field resonance coupling does not occur, power is not transmitted from the power transmission electrode to the power reception electrode, so that power supply from the AC power source is not performed, and unnecessary power is not generated. Consumption can be prevented.

  As described above, according to the first aspect, it is possible to detect a moving body such as a human body or an animal and transmit power without contact.

(Second aspect)
A contactless power feeding system according to a second aspect of the present invention is the contactless power feeding system according to the first aspect, wherein the direction of the electric field generated between the first and second power transmission electrodes and the first and second power reception electrodes are the same. Each electrode is arranged so that the direction of the electric field generated in the first and second electrodes is substantially parallel. According to the second aspect, power can be transmitted with high efficiency.

(Third aspect)
In the non-contact power feeding system according to the third aspect of the present invention, in the first and second aspects, the first and second power receiving electrodes are disposed at positions facing the first and second power transmitting electrodes, respectively. It is characterized by being. According to the third aspect, power can be transmitted with high efficiency.

(Fourth aspect)
In the non-contact power feeding system according to the fourth aspect of the present invention, in the first and second aspects, the first and second power receiving electrodes are respectively disposed on surfaces on which the first and second power transmitting electrodes are disposed. It is arranged on a plane perpendicular to the above. According to the fourth aspect, power can be transmitted with high efficiency.

(5th aspect)
In the contactless power feeding system according to the fifth aspect of the present invention, in the first and second aspects, the first and second power receiving electrodes are positioned on the same plane as the first and second power transmitting electrodes, respectively. It is characterized by being arranged in. According to the fifth aspect, power can be transmitted with high efficiency.

(Sixth aspect)
In the contactless power feeding system according to the sixth aspect of the present invention, in the first to fifth aspects, the first and second power receiving electrodes have a surface area greater than the surface area of the first and second power transmitting electrodes. It is large. According to the sixth aspect, the resonance characteristics of the power transmission device and the power reception device can be adjusted by adjusting the surface area of the electrodes. Therefore, the degree of freedom of design related to the non-contact power feeding system can be increased.

(Seventh aspect)
In the contactless power feeding system according to the seventh aspect of the present invention, in the first to fifth aspects, the first and second power receiving electrodes have a surface area greater than the surface area of the first and second power receiving electrodes. It is small. According to the seventh aspect, the resonance characteristics of the power transmission device and the power reception device can be adjusted by adjusting the surface area of the electrodes. Therefore, the degree of freedom of design related to the non-contact power feeding system can be increased.

(Eighth aspect)
A contactless power feeding system according to an eighth aspect of the present invention includes the plurality of power receiving devices according to the first to seventh aspects, and whether or not the dielectric exists in a predetermined position corresponding to each power receiving device. Therefore, the resonance characteristic of the power receiving device is adjusted so that the power supply state changes for each power receiving device.

  According to the eighth aspect, since the power supply state changes for each power receiving device, the convenience when used as a switch device can be improved.

(Other aspects)
Further, the present invention as described above is not limited to the above-described aspect of the non-contact power supply system, but can be realized by other aspects, that is, a power transmission device and a power reception device incorporated in the non-contact power supply system.

  According to the present invention, it is possible to detect the presence of an object that can be regarded as a dielectric such as a human body or an animal and transmit power without contact without using a detection device or the like.

It is a figure for demonstrating the whole structure of the non-contact electric power feeding system of 1st Embodiment. It is a figure which shows the circuit structure of a power transmission apparatus and a power receiving apparatus. It is a figure which shows the equivalent circuit of the power transmission apparatus and power receiving apparatus which are shown in FIG. It is the figure which showed the example of arrangement | positioning which has arrange | positioned the dielectric material between the power transmission coupler and power receiving coupler in an electric field resonance coupling system. In the arrangement example shown in FIG. 4, it is a figure for demonstrating the frequency characteristic of the power transmission efficiency which changes with the presence or absence of a dielectric material. It is a figure which shows the frequency characteristic of electric power transmission efficiency when simulating the dielectric constant of the muscle of a human body instead of a dielectric material, and simulating on the conditions which have arrange | positioned the muscle in the different position between electrodes. It is a figure which shows transition of the transmission efficiency in a frequency band 27.0 MHz among the simulation results of FIG. 6 (A), FIG. 6 (B), and FIG. 6 (C). It is a figure for demonstrating the circuit structure of the non-contact electric power feeding system which concerns on 1st Embodiment. It is a figure for demonstrating the circuit structure of the non-contact electric power feeding system which concerns on 2nd Embodiment. It is a figure for demonstrating the circuit structure of the non-contact electric power feeding system which concerns on other embodiment. It is a figure for demonstrating the circuit structure of the non-contact electric power feeding system which concerns on other embodiment. It is a figure for demonstrating the circuit structure of the non-contact electric power feeding system which concerns on other embodiment. It is a figure for demonstrating the circuit structure of the non-contact electric power feeding system which concerns on other embodiment. It is a figure for demonstrating the circuit structure of the non-contact electric power feeding system which concerns on other embodiment. It is the figure which showed the example of arrangement | positioning which has arrange | positioned the dielectric material between the power transmission coil and the receiving coil in a magnetic field resonance system. In the arrangement example shown in FIG. 15, it is a figure for demonstrating the frequency characteristic of the power transmission efficiency which changes with the presence or absence of a dielectric material.

  A mode for carrying out the present invention (hereinafter referred to as the present embodiment) will be described with a specific example. The present embodiment relates to a non-contact power feeding system that transmits power in a non-contact manner.

(1) Overall Configuration The non-contact power feeding system 1a of the first embodiment includes a power transmitting device 10 and a power receiving device 20 as shown in FIG. The power transmission device 10 includes power transmission electrodes 11 and 12 arranged on the YZ plane of the three-dimensional orthogonal coordinates XYZ in FIG. 1A, and inductors 13 and 14 electrically connected to the power transmission electrodes 11 and 12, respectively. An AC power generation unit 17 electrically connected to the power transmission electrodes 11 and 12 via the inductors 13 and 14 is provided. The power receiving device 20 that receives power from the power transmitting device 10 has power receiving electrodes 21 and 22 disposed at positions facing the power transmitting electrodes 11 and 12, respectively, and the power receiving electrodes 21 and 22 as shown in FIG. Inductors 23 and 24 that are electrically connected, and a load 27 that is electrically connected via the inductors 23 and 24 are provided.

  In the non-contact power feeding system 1a having such a configuration, the circuit characteristics of the resonance circuit constituted by the power transmission device 10 and the power reception device 20 are adjusted as described in detail later, for example, FIG. The power supply state is changed depending on whether or not a human body 100 movable in the Y-axis direction as shown in (B) exists between a predetermined position, for example, between the power transmission electrodes 11 and 12 and the power reception electrodes 21 and 22. Can do.

(2) About non-contact power supply Next, regarding the operation principle of non-contact power supply that is possible by electric field coupling between the electric field generated between the power transmission electrodes 11 and 12 and the electric field generated between the power reception electrodes 21 and 22, This will be described with reference to FIG. FIG. 2 is a diagram illustrating circuit configurations of the power transmission device 10 and the power reception device 20.

  The power transmission device 10 includes power transmission electrodes 11 and 12, inductors 13 and 14, connection lines 15 and 16, and an AC power generation unit 17. The power receiving device 20 includes power receiving electrodes 21 and 22, inductors 23 and 24, connection lines 25 and 26, and a load 27. Here, the power transmission electrodes 11 and 12 and the inductors 13 and 14 constitute a power transmission coupler. The power receiving electrodes 21 and 22 and the inductors 23 and 24 constitute a power receiving coupler.

  Here, the power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 are electrodes that are made of a conductive member and are spaced apart from each other, and are disposed at a predetermined distance d1 in the example of FIG. Has been. As long as the power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 are electrodes that are formed of conductive members and are spaced apart from each other, the electrode shape does not necessarily need to be rectangular, and may be circular, polygonal, or the like. There may be. In the example of FIG. 2, for convenience, as the power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22, flat electrodes having a rectangular shape having substantially the same size are illustrated. Further, the power transmission electrode 11 and the power reception electrode 21 are arranged in parallel so as to face each other with a distance d2, and the power transmission electrode 12 and the power reception electrode 22 are also spaced apart from each other, and in the example of FIG. They are arranged in parallel so as to face each other with the same distance d2.

  The total width D including the distance d1 between the electrodes of the power transmission electrodes 11 and 12 is set to be narrower than the near field indicated by λ / 2π, where λ is the wavelength of the electric field radiated from these electrodes. Has been. Similarly, the total width D including the distance d1 between the electrodes of the power receiving electrodes 21 and 22 is set to be narrower than the near field represented by λ / 2π. The length L of the power transmission electrodes 11 and 12 is set to be narrower than the near field indicated by λ / 2π. The length L of the power receiving electrodes 21 and 22 is also set to be narrower than the near field indicated by λ / 2π. The distance d2 between the power transmission electrode 11 and the power reception electrode 21 and between the power transmission electrode 12 and the power reception electrode 22 is also set to be shorter than the near field indicated by λ / 2π.

  Thus, by setting the electrode length L in the longitudinal direction of the power transmission electrodes 11 and 12 to be narrower than the near field indicated by λ / 2π, power can be efficiently transmitted to the power reception electrodes 21 and 22. it can.

  For example, the inductors 13 and 14 are configured by winding a conductive wire (for example, a coated copper wire). In the example of FIG. 2, one end of each of the inductors 13 and 14 is electrically connected to the ends of the power transmission electrodes 11 and 12. ing. The connection line 15 includes a conductive wire (for example, copper wire) that connects the other end of the inductor 13 and one end of the output terminal of the AC power generation unit 17. The connection line 16 is formed of a conductive wire material that connects the other end of the inductor 14 and the other end of the output terminal of the AC power generation unit 17. The connection lines 15 and 16 are constituted by coaxial cables or balanced cables.

  The AC power generation unit 17 generates AC power having a predetermined frequency and supplies the AC power to the inductors 13 and 14 via the connection lines 15 and 16.

  The inductors 23 and 24 are configured by, for example, winding a conductive wire (for example, a coated copper wire), and one end of each of the inductors 23 and 24 is electrically connected to the ends of the power receiving electrodes 21 and 22 in the example of FIG. ing. The connection line 25 includes a conductive wire (for example, copper wire) that connects the other end of the inductor 23 and one end of the input terminal of the load 27. The connection line 26 is formed of a conductive wire that connects the other end of the inductor 24 and the other end of the input terminal of the load 27. The connection lines 25 and 26 are constituted by coaxial cables or balanced cables.

  The load 27 is supplied with power output from the AC power generation unit 17 and transmitted via the power transmission coupler and the power reception coupler. In the present embodiment, a specific example of the load 27 will be described as a lighting device that can be illuminated by being in a power supply state.

  FIG. 3 is a diagram illustrating an equivalent circuit 300 of the power transmission device 10 and the power reception device 20 illustrated in FIG. In FIG. 3, impedance 2 indicates the characteristic impedance of the connection lines 15 and 16 and the connection lines 25 and 26, and has a value of Z0. The inductor 3 corresponds to the inductors 13 and 14 and has an element value of L. The capacitor 4 has an element value (C−Cm) obtained by subtracting a capacitor having an element value Cm generated between the power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 from a capacitor having an element value C generated between the power transmitting electrodes 11 and 12. Have The capacitor 5 indicates a capacitor generated between the power transmission electrodes 11 and 12 and the power reception electrodes 21 and 22 and has an element value of Cm. The capacitor 6 has an element value (C−Cm) obtained by subtracting a capacitor having an element value Cm generated between the power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 from a capacitor having an element value C generated between the receiving electrodes 21 and 22. Have The inductor 7 corresponds to the inductors 23 and 24 and has an element value of L.

  In the equivalent circuit 300 as described above, the resonance frequency of the power transmission coupler configured by the power transmission device 10 and the resonance frequency of the power reception coupler configured by the power reception device 20 are matched, and the electric field resonance coupling is performed. AC power can be supplied to the power receiving device 20.

(3) Resonance frequency As is apparent from the equivalent circuit 300 shown in FIG. 3, in the contactless power feeding system 1, the resonance characteristics of the power transmission coupler and the power reception coupler are determined by the electrical characteristics of the inductors 3 and 7 and the capacitors 4, 5, and 6. Changes. For example, when the dielectric 200 as shown in FIG. 4B is inserted between the electrodes arranged so that the power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 face each other as shown in FIG. The electrical characteristics of the capacitors 5 and 6, that is, the capacitance changes, and the resonance characteristics of the power transmission coupler and the power reception coupler change.

  For example, FIG. 5A shows a condition in which the resonance frequency of the power transmission coupler and the resonance frequency of the power reception coupler are matched with each other without disposing the dielectric 200 between the electrodes as shown in FIG. It is a figure which shows the frequency characteristic of electric power transmission efficiency at the time of simulation. Further, FIG. 5B shows a simulation under the condition that the resonance frequency of the power receiving coupler is shifted from the resonance frequency of the power transmission coupler without disposing the dielectric 200 between the electrodes as shown in FIG. 4A. It is a figure which shows the frequency characteristic of electric power transmission efficiency when doing. Further, FIG. 5C is a simulation under the condition in which the dielectric 200 is disposed between the electrodes as shown in FIG. 4B and the resonance frequency of the power transmission coupler and the resonance frequency of the power reception coupler are matched. It is a figure which shows the frequency characteristic of power transmission efficiency at the time.

  As is clear from FIGS. 5A to 5C, the power transmission efficiency varies depending on the presence or absence of the dielectric 200. Therefore, the presence or absence of the dielectric 200 depends on the power supply state and the non-power supply state. It is possible to function as a switch that changes.

  6 (A), 6 (B), and 6 (C) each simulate the dielectric constant of the muscle of the human body 100 instead of the dielectric 200, and the muscle is as shown in FIG. 4 (B). It is a figure which shows the frequency characteristic of electric power transmission efficiency when it simulates on the conditions arrange | positioned in the different position between electrodes. FIG. 7 shows the transition of the transmission efficiency when the frequency band is 27.0 MHz among the simulation results of FIGS. 6 (A), 6 (B), and 6 (C).

  As is clear from FIG. 7, since the transmission efficiency changes greatly when the muscle of the human body 100 is inserted into a specific position, that is, a position corresponding to the simulation result of FIG. The presence or absence of 100 can function as a switch that changes between a power supply state and a non-power supply state.

(4) First Embodiment In the non-contact power feeding system 1a according to the first embodiment as shown in FIG. 1 described above, the resonance characteristics that vary depending on the presence or absence of the dielectric 200 and the human body 100 described above are used. The circuit characteristics are adjusted so that the power supply state changes. As a specific example, in the non-contact power feeding system 1a, between the power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 as shown in FIG. The circuit characteristics are adjusted so that the power supply state changes depending on whether or not the human body 100 exists in the area Area1 close to the area 22.

  First, in the non-contact power feeding system 1a, as shown in FIG. 8B, it can be considered that the dielectric 200 corresponding to the human body 100 exists in the area Area1, and further, the circuit shown in FIG. An equivalent circuit as shown in FIG.

  FIG. 8C shows an equivalent circuit 300a corresponding to the equivalent circuit 300 shown in FIG. 3 described above, and shows a circuit configuration in which the capacitor 5 is omitted for convenience. As shown in FIG. 8B, the presence of the dielectric 200 in Area 1 inserts the dielectrics 201 and 202 into the capacitors 4 and 6, respectively, and increases the capacitance of the capacitors 4 and 6. Become. Here, since the dielectric 200 is inserted near the power receiving electrodes 21 and 22 with respect to the power transmitting electrodes 11 and 12, the dielectric 201 is thicker than the dielectric 202, and the capacitor 6 is compared with the capacitor 4. The capacitance of becomes larger.

  Therefore, in the state where the dielectrics 201 and 202 are inserted in the capacitors 4 and 6, the electric current between the inductors 3 and 7 and the capacitors 4, 5, and 6 is set so that the resonance frequency is matched between the power transmission coupler and the power reception coupler. By adjusting the characteristics, the non-contact power feeding system 1a can change from the non-power feeding state to the power feeding state when the human body 100 exists in the area Area1. On the contrary, in the state where the dielectrics 201 and 202 are not inserted in the capacitors 4 and 6, the inductors 3 and 7 and the capacitors 4, 5 and 6 are set so that the resonance frequencies are matched between the power transmission coupler and the power reception coupler. By adjusting the electrical characteristics, the non-contact power feeding system 1a can change from the power feeding state to the non-power feeding state due to a shift in the resonance frequency when the human body 100 exists in the area Area1.

  As described above, the non-contact power feeding system 1a stops the power transmission in a non-contact manner without using a detection device or the like in addition to the power transmission device 10 and the power receiving device 20 and the dielectric 200 being in a predetermined position. Or, conversely, it is possible to start power transmission without contact.

  In addition to the electric field resonance method, there is a magnetic field resonance method as a non-contact power transmission method. However, the magnetic field resonance method uses magnetic field resonance for coupling between transmission and reception, and has a high conductivity object such as metal. Induction heating occurs. On the other hand, the electric field resonance coupling method used by the non-contact power feeding system 1a does not generate heating such as induction heating even when a metal is present in the electric field. be able to.

  In the non-contact power feeding system 1a, when electric field resonance coupling does not occur, power is not transmitted from the power transmitting electrodes 11 and 12 to the power receiving electrodes 21 and 22, so that power is not supplied from the AC power source. Unnecessary power consumption can be prevented.

  In this way, the non-contact power feeding system 1a can detect the presence of an object that can be regarded as a dielectric such as the human body 100 or an animal and transmit power without contact without using a detection device or the like. For this reason, for example, when the human body 100 is located in the area Area1, it is possible to supply power to the load 27 and operate the lighting device.

  Note that electric field coupling is possible if the direction E1 of the electric field generated between the power transmission electrodes 11 and 12 and the direction E2 of the electric field generated between the power reception electrodes 21 and 22 are not perpendicular to each other. As shown in FIG. 6, by arranging each electrode so that the direction E1 of the electric field generated between the power transmission electrodes 11 and 12 and the direction E2 of the electric field generated between the power reception electrodes 21 and 22 are parallel to each other. The coupling strength of electric field coupling can be increased, and as a result, electric power can be transmitted with high efficiency.

(5) 2nd Embodiment Moreover, in 1st Embodiment, when the human body 100 exists in area | region Area1 between the power transmission electrodes 11 and 12 and the receiving electrodes 21 and 22, a power feeding state changes. Although described, the present invention is not limited to this. For example, the non-contact power feeding system 1b according to the second embodiment is, for example, outside the power transmission electrodes 11, 12 and the power receiving electrodes 21, 22 and the electrodes as shown in FIG. The circuit characteristics can be adjusted so that the power supply state changes depending on whether or not the human body 100 exists in the area Area2 adjacent to the area.

  First, in the non-contact power feeding system 1b according to the second embodiment, as shown in FIG. 9B, it is assumed that the dielectric 200 corresponding to the human body 100 exists in the area Area2, and further, FIG. It can be replaced with an equivalent circuit as shown in FIG.

  FIG. 9C shows an equivalent circuit 300b corresponding to the equivalent circuit 300 shown in FIG. 3 described above, and shows a circuit configuration in which the capacitor 5 is omitted for convenience. As is clear from FIG. 9C, it can be considered that the dielectric 203 is inserted in the capacitor 6 because the dielectric 200 exists in the Area 2. Thus, it can be considered that the capacitance of the capacitor 6 is increased by inserting the dielectric 203 into the capacitor 6.

  Therefore, the electrical characteristics of the inductors 3 and 7 and the capacitors 4, 5, and 6 are adjusted so that the resonance frequency matches between the power transmission coupler and the power reception coupler with the dielectric 203 inserted in the capacitor 6. Thus, the non-contact power feeding system 1b can change from the non-power feeding state to the power feeding state when the human body 100 exists in the area Area2. In addition, the electrical characteristics of the inductors 3 and 7 and the capacitors 4, 5, and 6 are adjusted so that the resonance frequency is the same between the power transmission coupler and the power reception coupler when the dielectric 203 is not inserted in the capacitor 6. Thus, the non-contact power feeding system 1b can change from the power feeding state to the non-power feeding state when the human body 100 exists in the area Area2.

(6) Other Embodiments Further, the non-contact power feeding system according to the present embodiment is not limited to the arrangement in which the power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 are opposed to each other. Can be adopted.

  For example, as in the non-contact power feeding system 1c shown in FIG. 10A, the power transmission electrodes 11 and 12 may be disposed on the XY plane and the power receiving electrodes 21 and 22 may be disposed on the ZY plane. Thus, even if the power receiving electrodes 21 and 22 are arranged at positions perpendicular to the power transmitting electrodes 11 and 12, for example, as shown in FIG. 10B, depending on whether or not the human body 100 exists in a predetermined region. The power supply state changes, and power can be transmitted with high efficiency. In addition, in the example shown to FIG. 10 (A) and FIG. 10 (B), although the power transmission electrodes 11 and 12 are arrange | positioned at the foot of the human body 100, ie, an under floor part, it is not limited to this. For example, as shown in FIG. 10C, the power transmission electrodes 11 and 12 can be arranged on the ZY plane, and the power reception electrodes 21 and 12 can be arranged on the head of the human body 100, that is, on the ceiling, on the XY plane. It is.

  Moreover, you may arrange | position the power transmission electrodes 11 and 12 and the receiving electrodes 21 and 22 on the same plane, ie, YZ plane, like the non-contact electric power feeding system 1d shown to FIG. 11 (A). Thus, even if the power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 are arranged on the same plane, for example, as shown in FIG. 11B, depending on whether or not the human body 100 exists in a predetermined region, The power supply state changes and power can be transmitted with high efficiency.

  Further, the dimensions of the power transmission electrodes 11 and 12 and the power reception electrodes 21 and 22 are not necessarily matched. For example, like the non-contact power feeding system 1e shown in FIG. 12A and FIG. May be made smaller than the surface area of the power transmission electrodes 21 and 22. In the example shown in FIG. 12A, the power receiving electrodes 21 and 22 are arranged on the XY plane perpendicular to the YZ plane on which the power transmitting electrodes 11 and 12 are arranged. In the example shown in FIG. The power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 are arranged on the same YZ plane. By adjusting the surface area of the electrodes in this manner, the resonance characteristics of the power transmission device 10 and the power reception device 20 can be adjusted, and as a result, the degree of freedom in design related to the non-contact power feeding system 1e can be increased.

  Further, as in the non-contact power feeding system 1f shown in FIGS. 13A and 13B, the power feeding state is provided depending on whether or not the human body 100 is provided at a predetermined position, including a plurality of power receiving devices 20a and 20b. The resonance characteristics may be adjusted so that changes for each of the power receiving devices 20a and 20b.

  For example, in the example shown in FIG. 13A, when the human body 100 exists in the area Area3a, only the power receiving apparatus 20a changes from the non-power supply state to the power supply state, and when the human body 100 exists in the area Area3b, The resonance characteristics related to the non-contact power feeding system are adjusted so that only 20b changes from the non-power feeding state to the power feeding state.

  Further, in the example illustrated in FIG. 13B, since the human body 100 exists in the area Area4, both the power receiving devices 20a and 20b are related to the non-contact power feeding system so that the power feeding state is changed from the non-power feeding state. The resonance characteristics are adjusted.

  As described above, in the example illustrated in FIGS. 13A and 13B, the power supply state and the non-power supply state change for each power receiving device, so that the convenience when used as a switch device can be improved.

  Moreover, you may make it the surface area of the receiving electrodes 11 and 12 become larger than the surface area of the power transmission electrodes 21 and 22 like the non-contact electric power feeding system 1g shown to FIG. 14 (A) and FIG. 14 (B). In the example shown in FIG. 14A, the power receiving electrodes 21 and 22 are arranged on the YZ plane perpendicular to the XY plane on which the power transmitting electrodes 11 and 12 are arranged. In the example shown in FIG. The power transmitting electrodes 11 and 12 and the power receiving electrodes 21 and 22 are arranged on the same YZ plane. By adjusting the surface area of the electrodes in this manner, the resonance characteristics of the power transmission device 10 and the power reception device 20 can be adjusted, and as a result, the degree of freedom of design related to the non-contact power feeding system 1g can be increased.

  In the contactless power supply system according to the present embodiment, the power supply state has been described depending on whether or not the human body 100 is present at a predetermined position. However, the present invention is not limited to the human body, for example, a dielectric such as a nonmetal. Of course, it can be anything that can be considered. Further, since the decorative material and the building material can also be regarded as a dielectric, it is possible to adjust the resonance state by designing in consideration of the dielectric constant even when the electrode is covered with the decorative material or the building material.

1a-1f Non-contact power supply system 10 Power transmission device 11, 12 Power transmission electrode 13, 14, 23, 24 Inductor 20 Power reception device 21, 22 Power reception electrode 100 Human body 200 Dielectric

Claims (11)

A power transmission device having first and second power transmission electrodes arranged apart from each other, and an inductor electrically connected between the first and second power transmission electrodes;
The first and second power receiving electrodes arranged apart from each other, and an inductor electrically connected between the first and second power receiving electrodes, the resonance frequency of which is the resonance frequency of the power transmission device A power receiving device that can feed power by electric field resonance coupling between the electric field between the first and second power transmitting electrodes and the electric field between the first and second power receiving electrodes,
While being close to at least one of the first and second power transmission electrodes and the first and second power reception electrodes, the distance from the first and second power transmission electrodes and from the first and second power reception electrodes When the dielectric does not exist in the predetermined regions different from each other, the resonance frequency of the power transmission device does not match the resonance frequency of the power reception device, and the dielectric exists in the predetermined region. Resonance characteristics of the power transmission device and the power reception device are adjusted so that the resonance frequency of the power transmission device matches the resonance frequency of the power reception device to start feeding ,
The dielectric is a human body or an animal,
A non-contact power feeding system characterized by that. The first and second power transmission electrodes and the first and second power reception electrodes are spaced apart from each other,
Space resonance frequency and is matched to the feed of the power receiving device and a resonance frequency of the power transmitting device when the dielectric is present between the said first and second power transmitting electrode first and second receiving electrode to start, the contactless power supply system of claim 1, the resonance characteristics of the power transmission device and the power receiving device is characterized in that it is adjusted.   The electrodes are arranged so that the direction of the electric field generated between the first and second power transmission electrodes is substantially parallel to the direction of the electric field generated between the first and second power receiving electrodes. The non-contact electric power feeding system according to claim 1 or 2 characterized by things.   The non-contact according to any one of claims 1 to 3, wherein the first and second power receiving electrodes are disposed at positions facing the first and second power transmitting electrodes, respectively. Power supply system.   The said 1st and 2nd receiving electrode is arrange | positioned in the surface perpendicular | vertical with respect to the surface where the said 1st and 2nd power transmission electrode is each arrange | positioned. The non-contact power feeding system according to item 1.   The said 1st and 2nd receiving electrode is arrange | positioned in the position on the same plane as the said 1st and 2nd power transmission electrode, respectively, The Claim 1 characterized by the above-mentioned. Contactless power supply system.   The contactless power feeding system according to any one of claims 1 to 6, wherein the first and second power receiving electrodes have a surface area larger than the surface areas of the first and second power transmitting electrodes. .   The contactless power feeding system according to any one of claims 1 to 6, wherein the first and second power receiving electrodes have a surface area smaller than the surface area of the first and second power transmitting electrodes. . A plurality of the power receiving devices;
9. The resonance characteristic of the power receiving device is adjusted so that a power feeding state changes for each power receiving device depending on whether or not the dielectric is present at a predetermined position. The non-contact electric power feeding system of any one of Claims. First and second power transmission electrodes that are spaced apart from each other;
An inductor electrically connected between the first and second power transmission electrodes;
When the resonance frequency matches the resonance frequency of the power receiving device including the first and second power receiving electrodes and the inductor electrically connected between the first and second power receiving electrodes, the first and second power receiving devices are provided. The electric field between the two power transmitting electrodes and the electric field between the first and second power receiving electrodes can be fed by electric field resonance coupling,
A dielectric is disposed in a predetermined region that is close to the first and second power transmission electrodes, and that has a different distance from the first and second power transmission electrodes and a distance from the first and second power reception electrodes. If the resonance frequency of the power transmission device does not match the resonance frequency of the power reception device when not present, and the dielectric is present in the predetermined region, the resonance frequency of the power transmission device and the resonance of the power reception device The resonance characteristics are adjusted so that the power supply starts at the same frequency ,
The dielectric is a human body or an animal,
A power transmission device characterized by that. First and second power receiving electrodes disposed apart from each other;
An inductor electrically connected between the first and second power receiving electrodes;
When the resonance frequency matches the resonance frequency of a power transmission device including the first and second power transmission electrodes and an inductor electrically connected between the first and second power transmission electrodes, The electric field between the two power transmitting electrodes and the electric field between the first and second power receiving electrodes can be fed by electric field resonance coupling,
A dielectric is disposed in a predetermined region that is close to the first and second power receiving electrodes and that has a distance from the first and second power receiving electrodes that is different from a distance from the first and second power receiving electrodes. If the resonance frequency of the power transmission device does not match the resonance frequency of the power reception device when not present, and the dielectric is present in the predetermined region, the resonance frequency of the power transmission device and the resonance of the power reception device The resonance characteristics are adjusted so that the power supply starts at the same frequency ,
The dielectric is a human body or an animal,
A power receiving device.

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