JP2014176155A - Non-contact power transmission apparatus and non-contact power transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission apparatus which is easily mounted on a wall or the like, also improves a degree of freedom in a mounting position and is capable of performing satisfactory power transmission.SOLUTION: The non-contact power transmission apparatus comprises: a power transmitting device 1 provided with a power transmitting resonator including a power transmitting coil 4a and a resonant capacitor 14 and a power transmitting circuit 15 for supplying high frequency power to the power transmitting resonator; and a power receiving device 2 provided with a power receiving resonator including a power receiving coil 4b and a resonant capacitor 21 and a power receiving circuit 22 for stably transmitting power generated in the power receiving resonator to a load. The power transmitting resonator and the power transmitting circuit are separated from each other and accommodated in a power transmitting coil case 10 and a power transmitting circuit case 11, respectively. The power receiving resonator and the power receiving circuit are separated from each other and accommodated in a power receiving coil case 17 and a power receiving circuit case 18, respectively. The power transmitting resonator and the power transmitting circuit are electrically connected and the power receiving resonator and the power receiving circuit are electrically connected by elements which do not fix a mutual arrangement relation between the cases.

Description

  The present invention relates to a non-contact power transmission device and a non-contact power transmission method that perform non-contact (wireless) power transmission between a power transmission coil and a power reception coil.

  As a method of transmitting power in a non-contact manner, an electromagnetic induction type by electromagnetic induction (several hundreds of kHz), an electric field / magnetic field resonance type by transmission between LC resonances via electric field or magnetic field resonance, a microwave power transmission type by radio waves (several GHz), Alternatively, a laser power transmission type using electromagnetic waves (light) in the visible light region is known. Among them, the electromagnetic induction type has already been put into practical use. This has the advantage that it can be realized with a simple circuit (transformer system), but there is also a problem that the transmission distance is short.

  Therefore, recently, electric field / magnetic field resonance type power transmission capable of short-distance transmission (up to 2 m) has attracted attention. Among these, in the case of the electric field resonance type, when a hand or the like is put in the transmission path, the human body is a dielectric, so that energy is absorbed as heat and dielectric loss occurs. On the other hand, in the case of the magnetic resonance type, the human body hardly absorbs energy, and dielectric loss can be avoided. From this point of view, attention to the magnetic resonance type has been increasing.

  FIG. 9 is a diagram showing an outline of a general configuration of a conventional non-contact power transmission apparatus using magnetic field resonance. The power transmission device 1 includes a power transmission coil that combines the loop coil 3a and the power transmission resonance coil 4a, and the power reception device 2 includes a power reception coil that combines the loop coil 3b and the power reception resonance coil 4b. A high frequency power driver 5 is connected to the loop coil 3a of the power transmission device 1, and the power of the AC power source (AC 100V) 6 is converted into high frequency power that can be transmitted and supplied. For example, a rechargeable battery is connected to the loop coil 3 b of the power receiving device 2 as a load 8 via a rectifier 7.

The loop coil 3a is a dielectric element that is excited by an electric signal supplied from the high-frequency power driver 5 and transmits the electric signal to the power transmission resonance coil 4a by electromagnetic induction. The power transmission resonance coil 4a generates a magnetic field based on the electrical signal output from the loop coil 3a. The power transmission resonance coil 4a has a maximum magnetic field strength at a resonance frequency fr = 1 / {2π (LC) ^1/2 } (L is an inductance of the power transmission resonance coil 4a, and C is a stray capacitance). It becomes. The electric power supplied to the power transmission resonance coil 4a is transmitted in a non-contact manner to the power reception resonance coil 4b by magnetic field resonance. The transmitted power is transmitted from the power receiving resonance coil 4 b to the loop coil 3 b by electromagnetic induction, rectified by the rectifier 7, and supplied to the rechargeable battery as the load 8. In this case, generally, the resonance frequencies of the power transmission resonance coil 4a and the power reception resonance coil 4b are set to be the same.

  If it is a non-contact electric power transmission apparatus using such a magnetic field resonance, the non-contact electric power transmission which intervened the thick wall currently used for the normal residence etc. is possible. However, in such a case, it is difficult to visually recognize and confirm the mutual positional relationship between the power transmission device and the power reception device, and it is difficult to attach the device and start operation. For example, when starting power transmission, it is not possible to start power transmission carelessly if it is unknown whether the other power receiving device is located or installed at a chargeable position. In addition, when metal or the like is present in the space between the power transmission device and the power reception device, the metal may be abnormally heated or the power transmission efficiency may be reduced due to the influence of the magnetic field.

  In relation to this problem, Patent Document 1 discloses disposing a sensor for measuring the magnetic field strength in the vicinity of the power transmission coil. That is, characteristics such as a bimodal characteristic are detected by the magnetic field intensity sensor when performing non-contact power transmission through the wall, and transmission is controlled accordingly. In the case of the bimodal characteristics, if power is transferred at a higher frequency of the two peak frequencies, the magnetic field strength between the power transmission and the power receiving coil becomes the lowest. Therefore, it is suggested that appropriate power transmission through a wall or the like is possible by setting in this state.

JP 2010-239847 A

  When non-contact power transmission is performed by using a non-contact power transmission device using magnetic resonance and arranging a power transmission device and a power reception device facing each other through an inclusion such as a wall, there are the following problems. . In other words, depending on the thickness of the inclusion, as the distance between the power transmission coil and the power reception coil increases, the size of each coil increases accordingly, so that the power transmission device and the power reception device become larger and are installed on a wall or the like. Becomes difficult.

  Further, when the non-contact power transmission device is installed in a high place, that is, a place near the ceiling or the eaves, it is particularly difficult to attach the device when the size is increased and the weight is increased. There is also a problem that it is difficult to replace parts in the device in the event of a failure or to perform regular maintenance.

  Furthermore, for example, when contactless power transmission is performed through a concrete wall containing a reinforcing bar, there is a difficulty. In other words, if the power transmission coil and power reception coil are not properly arranged, power loss will increase. Therefore, it is necessary to find the optimal installation location. This is because it causes troubles.

  The present invention solves such problems in the prior art, and provides a non-contact power transmission device that can be easily mounted on a wall or the like, has a high degree of freedom in the mounting position, and is capable of good power transmission. The purpose is to do.

  The contactless power transmission device of the present invention includes, as a basic configuration, a power transmission resonator including a power transmission coil and a resonant capacitor, a power transmission device including a power transmission circuit that supplies high-frequency power to the power transmission resonator, a power reception coil, and a resonance A power receiving resonator having a capacity, and a power receiving device having a power receiving circuit that stably transmits power generated by the power receiving resonator to a load, and the power transmission via an action between the power transmitting coil and the power receiving coil. It is configured to transmit power from a device to the power receiving device.

  In order to solve the above problems, in the non-contact power transmission device of the present invention, the power transmission resonator and the power transmission circuit are separated from each other, and are housed in a power transmission coil case and a power transmission circuit case, respectively. The power receiving circuit and the power receiving circuit are separated from each other and housed in a power receiving coil case and a power receiving circuit case, respectively, and elements that do not fix the mutual arrangement relationship of the cases. The resonator and the power receiving circuit are electrically connected.

  The non-contact power transmission method of the present invention basically includes a power transmission resonator including a power transmission coil and a resonant capacitor, a power transmission device including a power transmission circuit that supplies high-frequency power to the power transmission resonator, a power reception coil, Using a power receiving resonator configured by a resonant capacitor, and a power receiving device having a power receiving circuit that stably transmits power generated in the power receiving resonator to a load, the operation is performed through the action between the power transmitting coil and the power receiving coil. Electric power is transmitted from the power transmitting device to the power receiving device.

  In order to solve the above problems, the contactless power transmission method of the present invention separates the power transmission resonator and the power transmission circuit from each other, and stores them in a power transmission coil case and a power transmission circuit case, respectively, The power receiving circuit is separated from each other and housed in a power receiving coil case and a power receiving circuit case, respectively, the power transmitting coil case on one side of the inclusion, and the power receiving coil case on the other side of the inclusion. And arranging the power transmission circuit case and electrically connecting the power transmission resonator and the power transmission circuit by an element that does not fix the mutual arrangement relationship with the power transmission coil case, and arranges the power reception circuit case And the power receiving resonator and the power receiving circuit are electrically connected by an element that does not fix the mutual arrangement relationship with the power receiving coil case, and And wherein the transmitting power to the electric coils.

  According to the present invention, the power transmission resonator and the power transmission circuit, the power reception resonator and the power reception circuit are separated from each other and housed in separate cases, and the elements that do not fix the mutual arrangement relationship of the cases are provided. And the power transmission circuit, and the power receiving resonator and the power receiving circuit are electrically connected. Thereby, cases can be separated enough as needed, and the freedom degree of the attachment position of a power transmission coil and a receiving coil increases. In addition, since there are only a few circuit portions built in the power transmission coil case and the power reception coil case, the circuit portion can be made thin and lightweight, so that it can be easily attached to walls of various shapes.

Schematic cross-sectional view showing the configuration of the non-contact power transmission apparatus in the first embodiment The circuit diagram which shows the structural example of the one part element built in the power transmission coil case of the non-contact electric power transmission apparatus The circuit diagram which shows the structural example of the one part element in the receiving coil case built in the non-contact electric power transmission apparatus Schematic sectional view showing an example in which the configuration of the non-contact power transmission apparatus is applied to a thin wall Schematic sectional view showing an example in which the configuration of the non-contact power transmission device is applied to power feeding to a plurality of loads Schematic sectional view showing an example in which the configuration of the non-contact power transmission device is applied to power feeding to an electric vehicle Front view showing an example in which the configuration of the non-contact power transmission device is applied to a window frame Schematic sectional view of the application example Schematic cross-sectional view showing the configuration of the non-contact power transmission device used in the optimization experiment of the loop coil on the power receiving side in the second embodiment Figure showing the relationship between the voltage of the electronic load and the power transfer efficiency based on the results of the experiment Sectional drawing which shows the structure of the non-contact electric power transmission apparatus of a prior art example

  The non-contact power transmission apparatus of the present invention can take the following aspects based on the above configuration.

  That is, the elements in the power transmission coil case and the elements in the power transmission circuit case, and the elements in the power reception coil case and the elements in the power reception circuit case are electrically connected by cables. Can do. In this case, the cable and each element can be connected via a connector. By connecting the two cases with a cable with a connector, it is possible to easily connect. The cable connecting the power transmission coil case and the power transmission circuit case may have a shield structure.

  Further, the power transmission coil case, the power transmission circuit case, and the power receiving coil case are made of metal, and at least a part of the surface of each case interposed in a region where power is transmitted between the power transmitting coil and the power receiving coil. Can be configured to be provided with a non-metal part, for example, a resin substrate.

  Moreover, it can be set as the structure by which the resonance voltage detection circuit for detecting the resonance voltage of the said power transmission resonator is arrange | positioned in the said power transmission coil case. Thereby, stable electric power transmission is attained. In other words, the power transmission device detects the presence and location of the power receiving coil, detects foreign objects such as metal, and performs stable power transmission even if the power receiving side cannot be visually recognized across an inclusion such as a wall. It is desirable to provide a resonance voltage detection circuit for detecting the resonance voltage of the resonance circuit portion of the power transmission coil. In this case, by arranging the resonance voltage detection circuit in the power transmission coil case, a high voltage (several thousand volts) is applied to the cable between the power transmission circuit case and the power transmission coil case during power transmission (resonance) by magnetic field resonance. Can be prevented. In addition, since a high-frequency current flows between the power transmission circuit case and the power transmission coil case, interference with the outside can be reduced by using a shielded cable.

  Moreover, it can be set as the structure by which the detection circuit which detects the high frequency electric power of the said receiving resonator is arrange | positioned in the said receiving coil case. As a result, the cable between the power receiving coil case and the power receiving circuit case does not need to have a shield structure, and can be configured at low cost. Further, when the load operates with DC power, the power receiving circuit case does not need to be made of metal, so that the cost can be reduced.

  Moreover, it can be set as the structure by which the antenna for the information communication between the said power transmission apparatus and the said power receiving apparatus is arrange | positioned in the said power transmission coil case and the said power receiving coil case. However, there is a case where a power transmission device is installed in a room surrounded by reinforcing bars such as a reinforced concrete structure, or the case is housed in a metal casing, which may be inconvenient for communication. Therefore, the communication antenna is arranged near the power transmission coil on the power transmission device side and near the power reception coil on the power reception device side. As a result, in the case of a wall with reinforcing bars, a power transmission coil and a power reception coil are arranged in advance by selecting a place having little influence on the characteristics, so that information is stably exchanged between the power transmission device and the power reception device. It becomes possible.

  In this case, the ferrite members are respectively provided in contact with the back surfaces of the facing surfaces of the power transmission coil and the power receiving coil that face each other, and the antenna is disposed closer to the facing surface than the ferrite member. It can be. That is, when a communication antenna is arranged in the case, the case itself has a shield structure made of metal or the like for human body protection or interference radio wave countermeasures, so there is a possibility that communication radio waves do not go out of the case. Further, the communication state may become unstable due to the ferrite member (magnetic sheet) provided between the coil and the circuit or between the coil and the metal. Therefore, in order to exchange information reliably, it is desirable to provide a communication antenna on the side closer to the facing surface than the ferrite member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiment shows an example embodying the present invention, and the present invention is not limited to this.

<Embodiment 1>
1 is a schematic cross-sectional view showing a configuration of a non-contact power transmission apparatus according to Embodiment 1. FIG. In addition, the same reference number is attached | subjected about the element similar to the non-contact electric power transmission apparatus of the prior art example shown in FIG. 9, and the repetition of description is simplified.

  In this non-contact power transmission device, a power transmission device 1 and a power reception device 2 are arranged to face each other with an inclusion such as a wall 9 interposed therebetween (in this figure, the power transmission device 1 is disposed indoors and the power reception device 2 is disposed outdoors). And non-contact power transmission by an action such as magnetic coupling between the power transmission coil and the power reception coil, for example, magnetic field resonance.

  The power transmission device 1 has a configuration in which the constituent elements are divided into two groups, and the elements of each group are separated from each other and accommodated in the power transmission coil case 10 and the power transmission circuit case 11, respectively. The two groups of elements are electrically connected via a cable 12 with a connector and a connector 13 provided in each case. The cable 12 is used as an example of an element for electrically connecting the elements of each housed group between the cases without fixing the mutual arrangement relationship of the cases. In the power transmission coil case 10, a power transmission side coil module including a power transmission resonator constituted by a power transmission resonance coil 4a and a power transmission resonance capacitor 14 is accommodated. In the power transmission circuit case 11, a power transmission circuit 15 including a high frequency power driver 5 that converts the power of the AC power source 6 into high frequency power that can be transmitted is housed. The power transmission circuit 15 and the AC power supply 6 are also connected via the connector 16.

  Similarly, the power receiving device 2 has a configuration in which the constituent elements are divided into two groups, and the elements of each group are separated from each other and accommodated in the power receiving coil case 17 and the power receiving circuit case 18 respectively. The two groups of elements are electrically connected via a cable 19 with a connector and a connector 20 provided in each case. In the power receiving coil case 17, a power receiving side coil module including a power receiving resonator constituted by a power receiving resonance coil 4 b and a power receiving resonance capacitor 21 is accommodated. In the power receiving circuit case 18, a power receiving circuit 22 and a power storage unit 23 for transmitting stable power to a load are accommodated. The power receiving circuit case 18 and the load 8 are also connected via the connector 24.

  With the structure separated into two groups as described above, it can be easily installed on a wall or the like. Furthermore, since a large-sized circuit part is hardly built in the power transmission coil case 10 and the power reception coil case 17, a thin structure can be achieved. Thereby, the freedom degree of the installation place of the power transmission coil case 10 and the receiving coil case 17 in the case of the power transmission through a wall increases, and the non-contact power transmission apparatus excellent in usability can be provided. In the illustrated state, the central axes of the power transmission resonance coil 4a and the power reception resonance coil 4b mounted on the power transmission device 1 and the power reception device 2 are substantially coincident with each other.

  The power transmission coil case 10 and the power reception coil case 17 are made of metal, so that the case itself has a shield structure for human body protection and countermeasures against jamming waves. However, resin substrates 25 and 26 are used as an example of a non-metal without using metal in the region facing the power transmission resonance coil 4a and the power reception resonance coil 4b for power transmission. Also in the following embodiments, the resonance coil surface side that performs power transmission does not use metal and uses a resin substrate or nothing.

  Since a high-frequency current flows through the cable 12 that connects the power transmission coil case 10 and the power transmission circuit case 11, it is preferable to reduce interference to the outside by making the cable 12 a shield structure.

  The above is the basic configuration, but in the power transmission device 1, the ferrite sheet 27 is further disposed in the power transmission coil case 10 in contact with the power transmission resonance coil 4 a. Further, a resonance voltage detection circuit 28 for detecting the resonance voltage of the power transmission resonance coil 4b and a power transmission side communication antenna 29 are arranged.

  The ferrite sheet 27 is provided to prevent the circuit from malfunctioning due to the influence of the magnetic field generated by the power transmission resonance coil 4a and to prevent the coil characteristics from deteriorating due to the influence of the metal power transmission coil case 10. Yes. The communication antenna 29 is arranged closer to the wall 9 than the ferrite sheet 27 in order to reduce the influence of the ferrite sheet 27 and to exchange information reliably.

  The resonance voltage detection circuit 28 is provided to detect the presence and arrangement of the power receiving resonance coil 4b and to detect foreign substances such as metal. As a result, even if the power receiving side cannot be visually recognized across the inclusion such as the wall 9, stable power transmission can be achieved by performing confirmation based on the output of the resonance voltage detection circuit 28. By arranging the resonance voltage detection circuit 28 in the power transmission coil case 10, the cable 12 between the power transmission circuit case 11 and the power transmission coil case 10 has a high voltage (several thousand volts) at the time of power transmission by magnetic field resonance (during resonance). It can prevent being applied.

  In the power transmission device 1 of FIG. 1, the power transmission coil is configured by only the power transmission resonance coil 4a without using the loop coil, and the power from the high frequency driver is directly supplied to the power transmission resonance coil 4a (series resonance). A loop coil 3a (see FIG. 9) may be provided.

  On the other hand, in the power receiving device 2, the ferrite sheet 30 is further disposed in the power receiving coil case 17 in contact with the power receiving loop coil 3 b. A detection circuit 31 and a power receiving communication antenna 32 are arranged.

  The ferrite sheet 30 is provided to prevent the circuit from malfunctioning due to the influence of the magnetic field generated by the power receiving resonance coil 4b and to prevent the coil characteristics from deteriorating due to the influence of the metal power receiving coil case 17. Yes. The communication antenna 32 is arranged closer to the wall 9 side than the ferrite sheet 30 in order to reduce the influence of the ferrite sheet 30 and to exchange information reliably.

  The detection circuit 31 is provided for rectifying high-frequency power to be transmitted by a diode bridge or the like and converting it into DC power. By providing the detection circuit 31 in the power receiving coil case 17, a direct current flows through the cable 19 between the power receiving coil case 17 and the power receiving circuit case 18. Therefore, it is not necessary to make the cable 19 have a shield structure, and the cost can be reduced. In some cases, a shielded cable may be used.

  In the power receiving device 2, the power obtained by the power receiving loop coil 3 b is supplied to the detection circuit 31, converted from high frequency power to DC power, and supplied to the power receiving circuit 22. In the power receiving circuit 22, power is transmitted to the power storage unit 23 and the load 8 through a built-in power receiving voltage setting DC-DC converter. A super capacitor may be used instead of the power storage unit 23. Further, when the load 8 operates with alternating current, a DC-AC inverter may be provided to convert direct current into alternating current. As the load 8, a monitoring camera, an electric light, an electric vehicle (EV), or the like can be applied.

  FIG. 2 shows a part of the power transmission side coil module housed in the power transmission coil case 10, that is, the configuration of the resonance circuit constituted by the power transmission resonance coil 4 a and the power transmission resonance capacitor 14, and the resonance voltage detection circuit 28. It is a circuit diagram which shows an example. When the resonance circuit resonates, a high resonance voltage is generated at the connection portion 33. The resonance voltage detection circuit 28 includes a high resistance 34 in units of megohms, a detection diode 35, a capacitor 36 for storing the detection voltage, and a voltage dividing resistor 37. A voltage substantially divided by the voltage dividing ratio of the resistor 34 and the resistor 37 is accumulated in the capacitor 36. The detected voltage is input to an amplifier in the power transmission circuit 15 and supplied to the power transmission circuit 15 as a resonance voltage detection output.

  FIG. 3 shows a part of the power receiving coil module housed in the power receiving coil case 17, that is, a resonance circuit constituted by the power receiving resonance coil 4b and the power receiving resonance capacitor 21, the power receiving loop coil 3b, and the detection. 3 is a circuit diagram illustrating a configuration example of a circuit 31. FIG. The detection circuit 31 includes a diode bridge and a smoothing capacitor, and converts the power obtained by the power receiving loop coil 3b into DC power.

  In the present embodiment, the connector 16 and the connector 24 are used for the connection between the power transmission circuit case 11 and the AC power supply 6 and the connection between the power reception circuit case 18 and the load 8, respectively. There is no. Depending on the purpose, the power transmission circuit 15 and the AC power supply 6 or the power reception circuit 22 and the load 8 may be directly connected without using a connector. Although not shown, the power transmission device 1 may include elements for monitoring the reflected power of the power transmission resonator, the inductance of the power transmission resonator, and the like as necessary. As the power transmission resonance capacitor 14 or the power reception resonance capacitor 21, a variable capacitor (such as a variable capacitor or a trimmer capacitor) or a fixed capacitor can be used as a circuit element.

  According to the above configuration, a plurality of types of power transmission coil case 10 and power reception coil case 17 incorporating resonance coils having different diameters are prepared, and can be used by being replaced at the connector portion according to the wall thickness. It becomes easy. The resonance coil housed in the power transmission coil case 10 or the power reception coil case 17 needs to have a larger coil diameter as the interval between transmission and reception (wall thickness) becomes larger. It is possible to respond immediately to the walls, etc., and the convenience in installation work etc. is improved. If the frequencies of the respective resonance circuits are matched in advance, there is no need for adjustment and the usability is improved.

  4 to 7 show various examples of attachment of the wall 9 and power supply to various loads of the power transmission device 1 and the power reception device 2 based on the configuration of the present embodiment.

  FIG. 4 is a configuration example using a thin wall portion 38 in the wall 9a on which the power transmitting device 1 and the power receiving device 2 are installed in order to reduce the coil diameter and reduce the material cost. The power transmission circuit case 11 is fixed to a position that can be reached by the user on the indoor side, and the power transmission coil case 10 is fixed to a portion 38 that is thinner than the normal position of the wall 9a. The power receiving coil case 17 is fixed to the facing outside of the power transmitting coil case 10 (the central axes of both resonance coils are substantially the same). Next, the cable of the power receiving coil case 17 is extended to a target position, and the power receiving circuit case 18 is fixed. The figure shows an example in which the monitoring camera with light 39 is integrated with the power receiving circuit case 18 as a load. Here, when the housing of the monitoring camera with light 39 has a shield structure, the power receiving circuit 22 and the like to be accommodated in the power receiving circuit case 18 are not directly used without using the power receiving circuit case 18. Can be housed in the body. Thereby, cost reduction can be aimed at.

  According to this configuration example, by reducing the diameter of the power transmission / reception coil, the size of the case that accommodates it can be reduced. As a result, cost can be reduced. For example, since it is possible to replace only the power transmission coil case 10 by replacing the connector portion 13 of the power transmission circuit case 11, it is possible to immediately cope with various walls and the like.

  FIG. 5 is a configuration example in which a plurality of network cameras 40 corresponding to a DC power source are applied as loads on the power receiving side. Thus, when the load on the power receiving side is increased, the power transmission power may be increased by increasing the diameter of the power transmitting / receiving coil.

  FIG. 6 shows a configuration example in which an electric vehicle (EV) 41 stopped outside the room is charged by transmitting power from the indoor side through the wall 9. In this case, it is preferable from the viewpoint of usability and human protection that the outdoor power receiving coil case 17 is installed at a high position and the power receiving circuit case 18 is installed near the electric vehicle 41. When the power receiving circuit is directly connected to the battery of the electric vehicle 41, DC power may be supplied from the power receiving circuit case 18 through a plug. On the other hand, when the electric vehicle 41 is provided with a power receiving coil case 42 for non-contact power feeding, the electric vehicle 41 can be non-contact powered. That is, a DC-AC inverter is provided in the power receiving circuit of the power receiving circuit case 18 so that high frequency power is supplied from the power receiving circuit case 18 to the power transmission coil case 43 for non-contact power feeding (indicated by a dotted line).

  FIG. 7A and FIG. 7B show an example of a non-contact power transmission apparatus suitable for performing power transmission in a room where a wall 9b with metal inside exists, such as a reinforced concrete wall. In this example, it is assumed that power is transmitted through the window glass 44. FIG. 7A is a front view seen from the indoor side, and FIG. 7B is a sectional view thereof. In this example, a configuration is adopted in which the power transmission coil case 10 and the power reception coil case 17 are fixed using an attachment jig 46 fixed to the window frame 45. This is because fixing the power transmission coil case 10 and the power reception coil case 17 directly to the window glass 44 solves the problem of the case colliding or changing the cable distance when opening and closing the window.

  The attachment jig 46 is fixed to the window frame 45 (if the window frame is narrow, it is fixed to the wall), and the power transmission coil case 10 is attached to the position where the window glass 44 exists. And this power transmission coil case 10 and the power transmission circuit case 11 are connected with the cable 12 of a shield structure. A monitor unit may be provided in the power transmission circuit case 11 to display the power transmission state, the video of the monitoring camera 47, and the like. The power receiving coil case 17 is fixed to the outdoor side so as to face the power transmitting coil case 10 (the central axis is substantially the same) so as not to contact the window glass 44. The surveillance camera 47 may be fixed at a target position.

  In the above description, as an example of the inclusion, an example in which power is supplied through a wall of concrete (including a reinforcing bar) or glass has been shown. However, power supply through other inclusions such as power supply through water is also used. This embodiment can be applied.

<Embodiment 2>
With reference to FIG. 8A and FIG. 8B, the non-contact electric power transmission apparatus in Embodiment 2 is demonstrated.

  In general non-contact power transmission, power is transmitted by electromagnetic induction between the power receiving resonance coil 4b and the power receiving loop coil 3b, but the power that can be transmitted differs depending on the magnitude of the coupling coefficient between the two coils. In the prior art, the power is generally adjusted (optimized) by changing the distance between the power receiving resonance coil 4b and the power receiving loop coil 3b.

  However, in order to obtain the effect of the present invention sufficiently, it is difficult to change the distance between the power receiving resonance coil 4b and the power receiving loop coil 3b. This is because, in the present invention, it is also an object to reduce the weight by reducing the thickness of the power transmission coil case 10 and the power reception coil case 17, and therefore, the power reception resonance coil 4 b and the power reception loop coil 3 b are almost the same. This is because they are used in contact with each other.

  Therefore, in the present embodiment, in order to obtain the same effect as when the power is optimized by changing the distance between the power receiving resonance coil 4b and the power receiving loop coil 3b, the power is received according to the wall thickness or the like. Optimization is performed by changing the number of turns (the number of turns of the coil wire) and the pitch of the loop coil 3b for use.

  FIG. 8A shows a schematic diagram of an apparatus for measuring the power transmission efficiency when the number of turns of the power receiving loop coil 3b is changed. The configurations of the power transmitting coil case 10 and the power receiving coil case 17 are the same as those of the first embodiment shown in FIG.

  As a power transmission resonance coil 4a and a power reception resonance coil 4b, a coil having a diameter of 180 mm (50 T) is used, fixed to a wall 9 having a thickness of 100 mm, and power transmission when the voltage of the electronic load 48 is changed. Efficiency dependence was measured. The DC power source 49 is used as a power source, and the power transmission circuit 50 and the power reception circuit 51 are configured in accordance with them, but the basic functions are the same as those of the power transmission circuit 15 and the power reception circuit 22. As a parameter, the number of turns of the power receiving loop coil 3b having a diameter of 180 mm was changed to 5T, 10T, and 15T (pitch is fixed to 6 mm).

  The result of this experiment is shown in FIG. 8B. When the number of turns of the power receiving loop coil 3b is as small as 5T, the power transmission efficiency is lowered. On the contrary, when the number of turns of the power receiving loop coil 3b is as large as 15T, although the power transmission efficiency is not low, the voltage of the electronic load 48 becomes as high as 40V or more. In general, the voltage of the electronic load is limited by the specifications of the circuit, and considering that the voltage of the electronic load is 40 V or less in this experiment, the number of turns of the power receiving loop coil 3b under the conditions of this experiment 10T is optimal.

  In this way, it can be seen that if the number of turns (number of turns), pitch, etc. of the power receiving loop coil 3b is changed and optimized, the thickness of the wall can be dealt with. Actually, if you prepare multiple power receiving coil cases with different numbers of turns of the power receiving loop coil, and replace them with connectors according to the wall thickness, you can easily optimize them according to the wall thickness etc. Is possible. Alternatively, a loop coil wound with a large number of turns in advance may be used, and a region separated for each number of turns may be switched by a switch or the like according to the wall thickness or the like.

  The non-contact power transmission device of the present invention can be easily mounted on walls of various shapes because the coil system and the circuit system are separated to increase the degree of freedom of the coil mounting position and become thin and light. It is suitable for a non-contact power transmission device used through inclusions such as walls.

DESCRIPTION OF SYMBOLS 1 Power transmission apparatus 2 Power receiving apparatus 3a, 3b Loop coil 4a Power transmission resonance coil 4b Power reception resonance coil 5 High frequency power driver 6 AC power supply 7 Rectifier circuit 8 Load 9, 9a, 9b Wall 10, 43 Power transmission coil case 11 Power transmission coil case 12 , 19 Cables 13, 16, 20, 24 Connector 14 Power transmission resonance capacitor 15, 50 Power transmission circuit 17, 42 Power reception coil case 18 Power reception circuit case 21 Power reception resonance capacitor 22, 51 Power reception circuit 23 Power storage unit 25, 26 Resin substrate 27 , 30 Ferrite sheet 28 Resonance voltage detection circuit 29, 32 Communication antenna 31 Detection circuit 33 Connection 34, 37 Resistance 35 Diode 36 Capacitor 38 Thin point 39 Surveillance camera 40 with electric lamp Network camera 41 Electric vehicle (EV)
44 Window Glass 45 Window Frame 46 Mounting Jig 47 Monitoring Camera 48 Electronic Load 49 DC Power Supply

Claims (10)

A power transmission resonator including a power transmission coil and a resonant capacitor, and a power transmission device including a power transmission circuit that supplies high-frequency power to the power transmission resonator;
A power receiving resonator including a power receiving coil and a resonant capacitor, and a power receiving device having a power receiving circuit that stably transmits power generated by the power receiving resonator to a load,
In the non-contact power transmission device that transmits power from the power transmission device to the power reception device through the action between the power transmission coil and the power reception coil,
The power transmission resonator and the power transmission circuit are separated from each other and housed in a power transmission coil case and a power transmission circuit case, respectively.
The power receiving resonator and the power receiving circuit are separated from each other and housed in a power receiving coil case and a power receiving circuit case, respectively.
The non-contact power, wherein the power transmission resonator and the power transmission circuit, and the power reception resonator and the power reception circuit are electrically connected by an element that does not fix the mutual arrangement relationship of the cases. Transmission equipment.   The element in the said power transmission coil case and the element in the said power transmission circuit case, and the element in the said power receiving coil case and the element in the said power reception circuit case are each electrically connected by the cable. Non-contact power transmission device.   The non-contact power transmission apparatus according to claim 2, wherein the cable and each element are connected via a connector.   The non-contact power transmission device according to claim 2, wherein the cable connecting the power transmission coil case and the power transmission circuit case has a shield structure.   The power transmission coil case, the power transmission circuit case, and the power reception coil case are made of metal, and are not present on at least a part of the surface of each case interposed in a region where power transmission is performed between the power transmission coil and the power reception coil. The contactless power transmission device according to claim 1, wherein a metal part is provided.   The contactless power transmission device according to claim 1, wherein a resonance voltage detection circuit for detecting a resonance voltage of the power transmission resonator is disposed in the power transmission coil case.   The contactless power transmission device according to claim 1, wherein a detection circuit for detecting high-frequency power of the power receiving resonator is disposed in the power receiving coil case.   The contactless power transmission device according to claim 1, wherein an antenna for information communication between the power transmission device and the power reception device is disposed in the power transmission coil case and the power reception coil case.   9. The ferrite member is provided in contact with the back surfaces of the opposing surfaces of the power transmission coil and the power receiving coil that are opposed to each other, and the antenna is disposed closer to the opposing surface than the ferrite member. The contactless power transmission device described. A power transmission resonator including a power transmission coil and a resonance capacitor, a power transmission device including a power transmission circuit that supplies high-frequency power to the power transmission resonator, a power reception resonator including a power reception coil and a resonance capacitor, and the power reception resonator Using a power receiving device having a power receiving circuit that stably transmits the power generated in the load to the load,
In the non-contact power transmission method for transmitting power from the power transmission device to the power reception device through the action between the power transmission coil and the power reception coil,
The power transmission resonator and the power transmission circuit are separated from each other and housed in a power transmission coil case and a power transmission circuit case, respectively.
The power receiving resonator and the power receiving circuit are separated from each other and housed in a power receiving coil case and a power receiving circuit case, respectively.
The power transmission coil case is disposed on one side of the inclusion, the power reception coil case is disposed on the other side across the inclusion,
Electrically connecting the power transmission resonator and the power transmission circuit by an element that does not fix the mutual arrangement relationship with the power transmission coil case while arranging the power transmission circuit case,
The power receiving resonator and the power receiving circuit are electrically connected by an element that does not fix the mutual arrangement relationship with the power receiving coil case while arranging the power receiving circuit case,
A non-contact power transmission method, wherein power is transmitted from the power transmission coil to the power reception coil.

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