JP2020167910A - Power transmission and reception system - Google Patents

Abstract

To provide a power transmission and reception system capable of transmitting and receiving power even in the presence of water.SOLUTION: The power transmission and reception system is used for supplying power by a power transmission device 100 from outside a housing 200 to a power receiving device 300 disposed in the housing. The power transmission device includes output means (an oscillator 110) for outputting a signal having a predetermined frequency and a power transmission coupler (an alternating electric field excitation unit 140) for exciting an alternating electric field to the housing based on the signal having the predetermined frequency output from the output means. The power reception device includes a power reception coupler (a power reception coupler 310) for converting the alternating electric field excited to the housing into power and waterproof means (an adhesive 400) for waterproofing electrodes of the power reception coupler.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power transmission / reception system.

Patent Document 1 discloses a technique in which a concentric power transmission coupler and a power reception coupler having axial symmetry are arranged, and a metal support is passed through the center of the power transmission coupler and the power reception coupler to extend a distance capable of wireless transmission. It is disclosed.

Japanese Unexamined Patent Publication No. 2015-186294

By the way, since the technique disclosed in Patent Document 1 utilizes the resonance between the capacitor and the inductor, it becomes difficult to transmit electric power when water is interposed between the plates. That is, since the dielectric constants of water and air differ by about 80 times, there is a problem that if water exists between the plates, the resonance frequency changes significantly and it becomes difficult to transmit and receive power by electric field resonance.

The present invention has been made in view of the above points, and an object of the present invention is to provide a power transmission / reception system capable of transmitting / receiving power even in the presence of water.

In order to solve the above problems, the present invention is in a power transmission / reception system in which power is supplied to a power receiving device arranged inside the housing from outside the housing by the power transmission device, wherein the power transmission device transmits a signal having a predetermined frequency. It has an output means for outputting and a power transmission coupler for exciting an alternating electric field to the housing based on a signal of a predetermined frequency output from the output means, and the power receiving device is excited to the housing. It is characterized by having a power receiving coupler that converts the alternating electric field into electric power, and a waterproofing means for waterproofing the electrodes of the power receiving coupler.
It is possible to provide a power transmission / reception system capable of transmitting / receiving power even in the presence of water.

Further, in the present invention, in the power receiving coupler, the electrodes are arranged so as to face the inner wall surface of the housing, and an adhesive is applied around the electrodes of the power receiving coupler, so that the inner wall surface and the said It is characterized in that the electrodes are adhered to each other in a state of being separated by a predetermined distance.
According to such a configuration, power transmission is possible even when water is present, and stable power transmission characteristics can be obtained by keeping the space between the housing and the electrodes constant.

Further, the present invention is characterized in that the power receiving coupler is configured such that at least the surface on which the electrodes are arranged is covered with an intermediate.
According to such a configuration, by preventing the ingress of water by the intermediate, it is possible to transmit and receive power even when water intervenes.

Further, the present invention is characterized in that the waterproof means is configured between the electrode and the intermediate.
According to such a configuration, it is possible to prevent water from entering between the intermediate and the electrode and changing the characteristics.

Further, the present invention is characterized in that the waterproof means is configured between the electrode and the housing.
According to such a configuration, it is possible to prevent water from entering between the housing and the electrodes and changing the characteristics.

Further, the present invention is characterized in that the waterproof means is provided with a hole, a groove, a plug or a valve for draining the infiltrated water, even when water enters the housing according to such a configuration. Can be drained.

Further, the present invention is characterized in that the waterproof means is an O-ring.
According to such a configuration, it is possible to operate reliably even when water enters the housing.

Further, the present invention is characterized in that the intermediate is composed of a metal laminated film.
According to such a configuration, stable power transmission characteristics can be obtained by preventing the ingress of water by the intermediate and keeping the distance between the electrode plate and the metal layer constant due to the presence of the metal layer.

Further, in the present invention, the power receiving device includes a sensor for detecting a state inside the housing and a transmitting means for transmitting information indicating the state detected by the sensor, and the sensor and the transmitting means , It is characterized in that it operates by the electric power received by the power receiving coupler.
According to such a configuration, it is possible to notify the outside of the housing by the received power of the state inside the housing.

Further, the present invention is characterized in that the sensor is a water sensor that detects water in the housing, and the transmitting means transmits information about water detected by the water sensor.
According to such a configuration, it is possible to detect the ingress of water into the housing and notify the outside of the housing.

Further, the present invention has another power receiving device having no waterproof means, and determines the presence or absence of water in the housing based on the power receiving device and the information transmitted from the other power receiving device. , Characterized by.
With such a configuration, it is possible to detect the ingress of water into the housing based on whether or not the two power receiving devices can receive power.

Further, the present invention is characterized in that the housing is a closure for interconnecting cable core wires.
According to such a configuration, even if water enters the closure, it can operate reliably.

Further, according to the present invention, in a power transmission / reception system in which power is supplied to a power receiving device arranged inside the housing by a power transmitting device from outside the housing, the power transmitting device comprises an output means for outputting a signal having a predetermined frequency. It has a power transmission coupler that excites an alternating magnetic field based on a signal of a predetermined frequency output from the output means, and a first conversion means that converts the alternating magnetic field output from the power transmission coupler into an alternating electric field. The power receiving device includes a second conversion means for converting an alternating electric field into an alternating magnetic field, a power receiving coupler for converting an alternating magnetic field into electric power, and a sealing means for sealing an electrode for outputting the alternating electric field of the second conversion means. It is characterized by having.
It is possible to provide a power transmission / reception system capable of transmitting / receiving power even in the presence of water.

According to the present invention, it is possible to provide a power transmission / reception system capable of transmitting / receiving power even in the presence of water.

It is a figure which shows the structural example of the power transmission / reception system which concerns on embodiment of this invention. It is a figure which shows the configuration example of the power transmission apparatus shown in FIG. It is a figure which shows the configuration example of the power receiving device shown in FIG. It is a figure for demonstrating the operation principle of embodiment of this invention. It is a figure which shows the equivalent circuit of FIG. It is a figure which shows the frequency characteristic of the S parameter between a power transmission device and a power receiving device. It is a figure which shows the configuration example at the time of transmitting electric power through a conductor plate. It is a figure which shows the equivalent circuit of FIG. This is an example of arrangement when power is transmitted via a housing. This is a configuration example in which electric power is transmitted through a plurality of conductor plates that are not connected to each other. It is a figure which shows the arrangement mode of the power receiving coupler shown in FIG. 1 in a housing. It is a figure which shows the modification embodiment of this invention. It is a figure which shows the structural example of the power transmission apparatus which concerns on the modified embodiment of this invention. It is a figure which shows the structural example of the power receiving device which concerns on the modified embodiment of this invention. It is a figure which shows the structural example of the power transmission apparatus which concerns on the modified embodiment of this invention. It is a figure which shows the structural example of the power receiving device which concerns on the modified embodiment of this invention. It is a figure which shows the structural example of the power transmission / reception system which concerns on the modified embodiment of this invention.

Next, an embodiment of the present invention will be described.

(A) Explanation of Configuration Example of Embodiment of the Present Invention FIG. 1 is a diagram showing a configuration example of a power transmission / reception system according to the embodiment of the present invention. As shown in FIG. 1, the power transmission / reception system includes a power transmission device 100 having an alternating electric field excitation unit 140 and a power transmission control unit 170, and a power reception device 300 having a power reception coupler 310 and a power reception control unit 380. The power receiving device 300 is arranged inside the housing 200 having the lid portion 210 and the main body portion 220. The housing 200 is made of a metal member. Further, the power receiving coupler 310 is attached to the bottom surface of the main body 220 by the adhesive 400, as will be described later.

FIG. 2 is a diagram showing a configuration example of the power transmission device 100 shown in FIG. In the example of FIG. 2, the power transmission device 100 includes an oscillation unit 110, a power amplification unit 120, a power supply 130, an alternating electric field excitation unit 140, a control unit 150, and a reception unit 160. The power transmission control unit 170 shown in FIG. 1 is composed of an oscillation unit 110, a power amplification unit 120, a power supply 130, a control unit 150, and a reception unit 160.

The oscillator 110 generates, for example, a 13.56 MHz sine wave and outputs it. The frequency is an example, and may be a frequency other than this.

The power amplification unit 120 amplifies and outputs the sine wave power supplied from the oscillation unit 110 by using the power from the power supply 130.

The power supply 130 is composed of, for example, a primary battery or a secondary battery (for example, a lithium ion battery), and supplies DC power to the power amplification unit 120.

The alternating electric field excitation unit 140 generates an alternating electric field by the AC power supplied from the power amplification unit 120. The configuration of the alternating electric field excitation unit 140 will be described later.

The control unit 150 controls each unit of the device and executes processing according to the information included in the signal received by the reception unit 160.

The receiving unit 160 receives the signal transmitted from the transmitting unit 370, which will be described later, performs demodulation processing to extract the information contained in the signal, and supplies the information to the control unit 150.

FIG. 3 is a diagram showing a configuration example of the power receiving device 300 shown in FIG. In the example of FIG. 3, the power receiving device 300 includes a power receiving coupler 310, a rectifying unit 320, a power storage unit 330, a regulated power supply 340, a control unit 350, a sensor 360, and a transmitting unit 370.

Here, the power receiving coupler 310 receives the alternating electric power excited by the alternating electric field excitation unit 140 and supplies it to the rectifying unit 320 as AC power. The details of the power receiving coupler 310 will be described later.

The rectifying unit 320 rectifies the AC power supplied from the power receiving coupler 310, converts it into DC power, and outputs it.

The power storage unit 330 is composed of, for example, a secondary battery, a super capacitor, an electrolytic capacitor, or the like, and smoothes and outputs the pulsating current output from the rectifying unit 320.

An auxiliary primary battery may be connected. For example, by incorporating a switch or mechanism that drives the battery by the ingress of water, the electric power is supplementarily increased when the ingress of water, and the discharge of water or the intrusion of water over a long distance is notified. Is also good.

The regulated power supply 340 is composed of, for example, a DC-DC converter or the like, and outputs the DC power output from the power storage unit 330 by stepping down or boosting the DC power to a predetermined voltage.

The control unit 350 controls each unit of the device and transmits the information detected by the sensor 360 via the transmission unit 370.

The sensor 360 is composed of, for example, a water sensor that detects water, and when water has entered the housing 200, it detects the invading water and notifies the control unit 350 of it.

The LED or the like may be turned on while driving the sensor. As a result, the inside brightened by the LED can be visually confirmed from the transparent window that is small enough not to break. Alternatively, the intrusion of water can be visually detected by lighting the LEDs having different colors depending on whether the water has entered or not.

The transmission unit 370 modulates the carrier wave based on the information supplied from the control unit 350, converts it into an electromagnetic wave, and transmits it, for example.

Next, the operating principle of the wireless power supply according to the present embodiment will be described with reference to FIGS. 4 to 6.

FIG. 4 is a diagram for explaining the operating principle of a power transmission / reception system using electric field resonance. In the example of this figure, the power transmission / reception system 1 has a power transmission device 10 and a power reception device 20.

Here, the power transmission device 10 has electrodes 11, 12, inductors 13, 14, connecting lines 15, 16, and an AC power generating unit 17. Further, the power receiving device 20 has electrodes 21 and 22, inductors 23 and 24, connecting lines 25 and 26, and a load 27. The electrodes 11 and 12 and the inductors 13 and 14 form a power transmission coupler. The electrodes 21 and 22 and the inductors 23 and 24 form a power receiving coupler.

Here, the electrodes 11 and 12 are made of conductive members and are arranged at a predetermined distance d1. In the example of FIG. 4, as the electrodes 11, 12, 21 and 22, a flat plate-shaped electrode having a rectangular shape having substantially the same size is exemplified. Further, the electrode 11 and the electrode 21 are arranged in parallel so as to face each other with a distance d2, and the electrode 12 and the electrode 22 are also arranged in parallel so as to face each other with the same distance d2. The electrodes 11, 12, 21, 22 may be electrodes having a shape other than that shown in FIG. For example, it may be a circular or elliptical flat plate electrode, a three-dimensional shape such as a sphere, or an electrode having a curved or bent shape instead of a flat plate.

The total width D including the distance d1 between the electrodes 11 and 12 is set to be narrower than the near field represented by λ / 2π when the wavelength of the electric field radiated from these electrodes is λ. .. Similarly, the total width D including the distance d1 between the electrode 21 and the electrode 22 is set to be narrower than the near field represented by λ / 2π. Further, the distance d2 between the electrode 11 and the electrode 21 and the electrode 12 and the electrode 22 is also set to be shorter than the near field indicated by λ / 2π.

The inductors 13 and 14 are configured by winding, for example, a conductive wire (for example, a copper wire), and in the example of FIG. 4, one end of each is electrically connected to the ends of the electrodes 11 and 12. .. The connection wire 15 is composed of a conductive wire (for example, a copper wire) that connects the other end of the inductor 13 and one end of the output terminal of the AC power generating unit 17. The connection wire 16 is composed of a conductive wire rod that connects the other end of the inductor 14 and the other end of the output terminal of the AC power generating unit 17. The connecting lines 15 and 16 are composed of a coaxial cable or a balanced cable.

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

Like the electrodes 11 and 12, the electrodes 21 and 22 are made of conductive members and are arranged at a predetermined distance d1.

The inductors 23 and 24 are configured by winding, for example, a conductive wire rod, and in the example of FIG. 4, one end of each is electrically connected to the ends of the electrodes 21 and 22. The connection wire 25 is composed of a conductive wire (for example, a copper wire) that connects the other end of the inductor 23 and one end of the input terminal of the load 27. The connection wire 26 is composed of a conductive wire rod 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 composed of a coaxial cable or a balanced cable.

The load 27 is output from the AC power generation unit 17, and the power transmitted via the power transmission coupler and the power reception coupler is supplied. The load 27 is composed of, for example, a rectifier, a secondary battery, and the like. Of course, it may be other than this.

FIG. 5 is a diagram showing an equivalent circuit of the power transmission / reception system 1 shown in FIG. In FIG. 5, impedance 2 indicates the output impedance of the AC power generating unit 17, and impedance 27 indicates the input impedance of the load 27. Here, it will be described that both have a value of Z0. The characteristic impedances of the connection lines 15 and 16 and the connection lines 25 and 26, which are not specified in the equivalent circuit, are also set to Z0. The inductors 3a and 3c correspond to the inductors 13 and 14 and have an element value of L. The capacitor 4a is obtained by subtracting half the value of the capacitor having the element value C generated between the electrodes 11 and 12 from the value of 1/2 of the capacitor having the element value 2 Cm generated between the electrodes 11 and 12 and the electrodes 21 and 22 (C). -Cm). Capacitors 4b and 4d represent capacitors generated between electrodes 11 and 12 and electrodes 21 and 22, and have an element value of 2 Cm. The capacitor 4c is the element value (C) obtained by subtracting the value of 1/2 of the capacitor having the element value of 2 Cm generated between the electrodes 11 and 12 and the electrodes 21 and 22 from the capacitor having the element value C generated between the electrodes 21 and 22. -Cm). The inductors 3b and 3d correspond to the inductors 23 and 24 and have an element value of L.

FIG. 6 shows the frequency characteristics of the S-parameters between the power transmitting device 10 and the power receiving device 20. Specifically, the horizontal axis of FIG. 6 indicates the frequency, and the vertical axis indicates the insertion loss (S21) from the power transmitting device 10 to the power receiving device 20. As shown in FIG. 6, the insertion loss from the power transmitting device 10 to the power receiving device 20 has an impedance maximum value at frequencies f _C , and has an impedance matching point, that is, a resonance point at frequencies f _L and f _H. ing. Here, the frequency f _C is determined by the inductance value L of the inductors 3a to 3d shown in FIG. 5 and the capacitance value C of the capacitor formed by the electrodes 11 and 12 or the electrodes 21 and 22. The frequencies f _L and f _H are the inductance values L of the inductors 3a to 3d shown in FIG. 5, the capacitance values 2 Cm of the capacitors formed by the electrodes 11 and 12 and the electrodes 21 and 22, and the electrodes 11 and 12. It is determined as an approximate value by the capacitance value C of the capacitor generated between the electrodes 21 and 22, respectively.

The frequency of the AC power generated by the AC power generating unit 17 is set to be equal to f _L or f _H shown in FIG. By setting the frequency of the AC power generating unit 17 in this way, the insertion loss from the power transmitting device 10 to the power receiving device 20 becomes approximately 0 dB, so that the power can be supplied from the power transmitting device 10 to the power receiving device 20 without loss. Can be sent.

In the configuration shown in FIG. 4, the electrodes 11 and 12 of the power transmitting device 10 and the electrodes 21 and 22 of the power receiving device 20 are electroresonically coupled, and the electrodes 11 and 12 of the power transmitting device 10 to the electrodes 21 and 22 of the power receiving device 20. AC power is transmitted by the electric field.

That is, in the configuration shown in FIG. 4, the electrodes 11 and 12 of the power transmission device 10 and the electrodes 21 and 22 of the power receiving device 20 are arranged so as to be separated by a distance d2 shorter than the near field λ / 2π. Electrodes 21 and 22 are arranged in a region where the electric field components radiated from 11 and 12 are dominant. Further, the resonance frequency of the capacitors and inductors 13 and 14 formed between the electrodes 11 and 12 is set to be substantially equal to the resonance frequency of the capacitors and inductors 23 and 24 formed between the electrodes 21 and 22. Has been done. As described above, since the electrodes 11 and 12 of the power transmitting device 10 and the electrodes 21 and 22 of the power receiving device 20 are electrically resonated, the electrodes 11 and 12 of the power transmitting device 10 are connected to the electrodes 21 and 22 of the power receiving device 20. On the other hand, AC power is efficiently transmitted by the electric field.

The above example is an example in which the power transmission coupler and the power reception coupler are arranged so as to face each other. As shown in FIG. 7, the electrodes 11 and 12 constituting the power transmission coupler and the electrodes 21 constituting the power reception coupler 21 It has been experimentally found that power can be transmitted from the power transmission coupler to the power receiving coupler even when the power plates and 22 are arranged so as to sandwich the conductive plate 500 and are arranged apart from each other by a predetermined distance. In this case, the power transmission coupler excites an alternating electric field with respect to the conductive plate 500, and the excited alternating electric field propagates through the conductive plate to generate AC power in the power receiving coupler. According to the experiment, when the power receiving coupler is arranged at a position within 20 cm from the conductive plate 500, the efficiency of supplying power from the power transmitting device 100 to the power receiving device 300 can achieve about 20%. Therefore, for example, the power transmitting device 100 When is an output of 50 W, the power receiving device 300 can receive a power of 10 W.

FIG. 8 is a diagram showing an equivalent circuit according to the embodiment of FIG. In FIG. 8, the same reference numerals are given to the portions corresponding to those in FIG. As shown in FIG. 8, in the embodiment of the present invention, the electrodes 4e and 4f of the power transmission coupler excite an alternating electric field in the housing shown by the broken line. Such an alternating electric field is transmitted through the housing and is received by the electrodes 4g and 4h. The electric power received by the electrodes 4g and 4h is supplied to the load 27. The housing shown by the broken line is grounded via an inductor. The ground may be a capacitor instead of an inductor.

FIG. 9 is a diagram showing a configuration example of the alternating electric field excitation unit 140 shown in FIG. 2 and the power receiving coupler 310 shown in FIG. As shown on the left side of FIG. 9A, the alternating electric field excitation portion 140 is configured such that two electrodes 142 and 143 are arranged on the surface of a circuit board 101 composed of a dielectric material at a predetermined distance. .. As shown on the right side of FIG. 9A, the power receiving coupler 310 is configured such that two electrodes 312 and 213 are arranged on the surface of the circuit board 311 at a predetermined distance. In the example of FIG. 9, the case where the alternating electric field excitation unit 140 and the power receiving coupler 310 have the same configuration is taken as an example.

FIG. 9B is a diagram schematically showing how the alternating electric field excitation unit 140 and the power receiving coupler 310 are coupled via a metal member constituting the housing 200. As schematically shown in FIG. 9B, the alternating electric field excitation unit 140 is held by the user (administrator) with the electrodes 142 and 143 facing the housing 200 side. Further, the power receiving coupler 310 of the power receiving device 300 is arranged so that the electrodes 312 and 313 face the housing 200 side. In this case, as in FIG. 7, electric power can be transmitted from the power transmitting device 100 to the power receiving device 300.

In the housing 200 shown in FIG. 1, there may be a gap between the lid 210 and the main body 220, and the lid 210 and the main body 220 may not be electrically connected to each other. In FIG. 10, when the conductor plates 501 to 503 that are not connected to each other are present, the electrodes 11 and 12 are arranged so as to face the back surface of the conductor plate 501, and the front surface (front surface) of the conductor plate 502 is shown. The electrodes 21A and 22A are arranged so as to face each other, and the electrodes 21B and 22B are arranged so as to face the surface of the conductor plate 503. In such a state, when an alternating electric field is excited in the conductor plate 501 by the electrodes 11 and 12, alternating current is generated in the electrodes 21A and 21B provided on the conductor plate 502, and the electrodes provided on the conductor plate 503. It was confirmed that AC power was also generated in 21A and 21B.

Therefore, as shown in FIG. 1, even when the lid 210 and the main body 220 of the housing 200 are not electrically connected to each other, electric power is supplied from the power transmitting device 100 to the power receiving device 300. Can be supplied.

FIG. 11 is a diagram showing an arrangement state of the power receiving coupler 310 on the main body 220 in the embodiment shown in FIG. As shown in FIG. 11, the power receiving coupler 310 is arranged so that the electrodes 312 and 313 face the inner surface side of the main body 220. Further, an adhesive 400 is applied between the power receiving coupler 310 and the inner surface of the main body 220. The adhesive 400 has a predetermined thickness, and as a result, the power receiving coupler 310 is arranged at a predetermined distance from the inner surface of the main body 220. The distance to be separated is preferably within 3 mm, for example.

As shown in FIG. 11, the adhesive 400 is arranged so as to surround the electrodes 312 and 313 of the power receiving coupler 310, and the electrodes 312 and 313 of the power receiving coupler 310 are adhered to the inner surface of the main body 220. Therefore, even if water enters the inside of the housing 200, water enters between the electrodes 312 and 313 and the inner surface of the main body 220, and the power receiving coupler 310 is caused by the change in the dielectric constant. It is possible to prevent the resonance frequency of the above from changing. Further, according to the configuration shown in FIG. 11, since the distance between the main body 220 and the power receiving coupler 310 can always be kept constant, the resonance frequency can be kept constant by keeping the capacitance component between them constant. Stable power reception can be performed.

(B) Description of Operation of Embodiment of the Present Invention Next, the operation of the embodiment of the present invention will be described. For example, when important equipment (for example, network communication equipment, electrical equipment, etc.) is arranged in the housing 200 shown in FIG. 1, and the housing 200 is arranged in an outdoor or underground utility tunnel or the like. It is necessary to investigate whether water has entered the inside of the housing 200. Conventionally, the lid 210 of the housing 200 is removed and the inside is visually inspected, or a transparent window or the like is provided in a part of the housing 200 and the inside is visually inspected through the window. Was there.

When removing the lid 210, a removal operation is required, so that there is a problem that a great deal of labor is required when there are a large number of housings 200.

In addition, when a transparent window is provided, the administrator must move from the window to a position where the inside can be seen. For example, when the window is placed in a high place, a ladder or the like is required. There was a point. Further, since the window portion is often composed of a resin such as acrylic, when the housing 200 is arranged outdoors, the acrylic is deteriorated by ultraviolet rays and water enters the inside through the window portion. There was a problem that there was.

On the other hand, in the present embodiment, it is possible to know whether or not water has infiltrated by simply holding the power transmission device 100 in the hand or attaching the power transmission device 100 to the tip of the extension rod and bringing it closer to the housing 200. Since it can be done, the labor of the administrator can be greatly reduced.

That is, when the manager turns on the power of the power transmission device 100, the control unit 150 starts the operation of each part of the device. The oscillating unit 110 generates a sine wave having a predetermined frequency and outputs it to the power amplification unit 120. The power amplification unit 120 amplifies and outputs the sine wave power supplied from the oscillation unit 110 based on the power from the power supply 130. The alternating electric field excitation unit 140 excites the alternating electric field with respect to the housing 200.

The alternating electric field excited by the power transmission device 100 to the housing 200 is transmitted to the main body 220 by the same principle as in FIG. 7 or 10, and is transmitted from the bottom surface of the main body 220 to the power receiving coupler 310. As a result, AC power is excited to the electrodes 312 and 313 of the power receiving coupler 310.

The AC power excited by the electrodes 312 and 313 is rectified by the rectifying unit 320 and then stored in the power storage unit 330. The regulated power supply 340 boosts or lowers the DC power stored in the power storage unit 330 and supplies it to the control unit 350. As a result, the control unit 350 becomes operable.

When the control unit 35 becomes operable, the control unit 350 acquires the detection signal from the sensor 360 and generates information indicating whether or not water has entered the inside of the housing 200 to generate the transmission unit 370. Supply to.

The transmission unit 370 modulates a carrier wave having a predetermined frequency based on the information supplied from the control unit 350, and transmits the carrier wave to the power transmission device 100. As the carrier wave, an electric field may be used for transmission, or an electromagnetic wave or a sound wave may be used.

The receiving unit 160 that has received such a carrier wave demodulates the carrier wave, extracts the superimposed information, and supplies it to the control unit 150. The control unit 150 refers to the supplied information, and for example, when water has entered the inside of the housing 200, for example, outputs a warning sound from a speaker (not shown) or warns a display unit (not shown). By displaying a message, it is possible to inform the administrator of the ingress of water.

As described above, in the embodiment of the present invention, as shown in FIG. 1, the power receiving device 300 is arranged inside the housing 200, and the power receiving coupler 310 is attached to the adhesive 400 as shown in FIG. Since it is fixed to the inner surface of the main body 220 via the via, even when water enters the inside of the housing 200, the alternating electric field can be received and electric power can be generated.

Further, the structure may be such that water does not easily enter between the power receiving device 300 and the main body 220 and easily escapes. More specifically, for example, by appropriately providing a valve, a hole, a groove, or a plug between the power receiving device 300 portion and the main body 220 portion, it is possible to form a structure in which water is difficult to enter and easily escapes. With such a configuration, even when water enters the inside of the housing 200, it is possible to receive an alternating electric field and generate electric power.

Further, in the embodiment of the present invention, even when the housing 200 is made of a conductive member such as metal, power is supplied from the power transmission device 100 to the power receiving device 300, and the lid of the housing 200 is covered. The internal state can be known without opening the part 210. Therefore, it is possible to reduce the labor of the administrator.

(C) Description of Modified Embodiment It goes without saying that each of the above embodiments is an example, and the present invention is not limited to the above-mentioned case.

For example, in the above-described embodiment, as shown in FIG. 11, the power receiving coupler 310 is fixed to the main body 220 by the adhesive 400, but as shown in FIG. 12, the power receiving coupler 310 is covered with an intermediate. However, the covered power receiving coupler 310 may be arranged inside the housing 200. More specifically, in the example of FIG. 12, the power receiving coupler 310 is covered with metal laminating films 420 and 430 having a metal-resin laminated structure. As an example of the metal laminate films 420 and 430, an aluminum laminate film obtained by laminating a 24 μm nylon resin on a 40 μm aluminum foil can be used. Of course, an aluminum laminated film having a thickness other than this may be used. In this case, power is supplied from the housing 200 to the power receiving coupler 310 via the aluminum foil by the same principle as in FIG. Further, since the aluminum laminated film is coated with resin, even if it is put in the housing 200, an inadvertent short circuit does not occur. Further, since it is in the form of a film, it can be bent inside the housing 200, so that it can be easily laid inside the housing 200.

In the example of FIG. 12, both sides of the power receiving coupler 310 are covered, but only the surface on which the electrodes are arranged may be covered.

Further, in the embodiment shown in FIG. 1, the information detected by the sensor 360 is transmitted to the power transmission device 100 by the transmission unit 370, but for example, as shown in FIGS. 13 and 14, electric power is transmitted. Information may be transmitted by the reflected wave of the alternating electric field for the purpose.

More specifically, FIG. 13 is a diagram showing a configuration example of the power transmission device 700 according to the modified embodiment. In FIG. 13, the same reference numerals are given to the portions corresponding to those in FIG. 2, and the description thereof will be omitted. 13 is the same as FIG. 2 except that the receiving unit 160 is replaced with the reflected wave receiving unit 710 as compared with FIG. 2.

Further, FIG. 14 is a diagram showing a configuration example of the power receiving device 800 according to the modified embodiment. In FIG. 14, the parts corresponding to those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 14, as compared with FIG. 3, the transmission unit 370 is replaced by the modulation unit 810. Other than this, it is the same as in FIG.

Here, the modulation unit 810 generates, for example, a reflected wave of the alternating electric field transmitted from the alternating electric field excitation unit 140 by short-circuiting or opening the electrodes 312 and 312, and the amplitude or phase of the reflected wave, etc. Send information by. A resistance element having a predetermined element value for converting the received alternating electric field into thermal energy may be connected to the electrodes 312 and 313.

The reflected wave receiving unit 710 receives the reflected wave from the power receiving device 300, detects the amplitude or phase of the reflected wave, demodulates the information contained in the reflected wave, and supplies it to the control unit 150. The control unit 150 can determine the presence or absence of water intrusion based on the information supplied from the reflected wave receiving unit 710 and notify the administrator.

As described above, according to the modified embodiment shown in FIGS. 13 and 14, information can be transmitted by the sensor 360 by the reflected wave of the alternating electric field, so that the configuration is simplified as compared with the case where a carrier wave other than the alternating electric field is used. can do. Further, by using an alternating electric field, information can be received from the inside of the metal housing 200.

15 and 16 are diagrams showing other modified embodiments. FIG. 15 is a diagram showing a configuration example of the power transmission device 900 according to the modified embodiment. In FIG. 15, the same reference numerals are given to the portions corresponding to those in FIG. 2, and the description thereof will be omitted. Compared with FIG. 2, in FIG. 15, the receiving unit 160 and the alternating electric field excitation unit 140 are excluded, and the receiving unit 910, the transmitting unit 920, and the converter 930 are added.

Here, the transmission unit 920 converts the signal output from the power amplification unit 120 into electromagnetic waves and transmits the signal. The converter 930 converts the electromagnetic wave transmitted from the transmission unit 920 into an alternating electric field and outputs it. Further, the converter 930 converts the alternating electric field transmitted from the power receiving device 1000 into an electromagnetic wave and outputs it. The receiving unit 910 receives the electromagnetic wave output from the converter 930, demodulates it, and supplies it to the control unit 150.

FIG. 16 shows a configuration example of the power receiving device 1000. In FIG. 16, the parts corresponding to those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. Compared with FIG. 3, in FIG. 16, the power receiving coupler 310 and the transmitting unit 370 are excluded, and the receiving unit 1010, the transmitting unit 1020, and the converter 1030 are added.

Here, the transmission unit 1020 converts the signal output from the control unit 350 into electromagnetic waves and transmits the signal. The converter 1030 converts the electromagnetic wave transmitted from the transmission unit 1020 into an alternating electric field and outputs it. Further, the converter 1030 converts the alternating electric field transmitted from the power transmission device 900 into electromagnetic waves and outputs the electromagnetic waves. The electrodes constituting the converter 1030 are sealed so that water or the like does not enter. The receiving unit 1010 receives the electromagnetic wave output from the converter 930, demodulates it, and supplies it to the control unit 350.

In the modified embodiment shown in FIGS. 15 and 16, since the converter 930 and the converter 1030 are used, devices for transmitting and receiving electromagnetic waves (for example, RFID (Radio Frequency Identifier) and RFID reader) can be used. Further, since the converter 930 and the converter 1030 convert the electric power and the signal into an alternating electric field, the electric power and the signal can be transmitted through the housing 200 even when the housing 200 is composed of a conductive member such as metal. Can be done.

FIG. 17 is a diagram showing still another modification embodiment. In FIG. 17, the same reference numerals are given to the portions corresponding to those in FIG. 1, and the description thereof will be omitted. In FIG. 17, as compared with FIG. 1, the power receiving device 300 inside the housing 200 is excluded, and the power receiving couplers 310A and 310B and the power receiving control units 380A and 380B are arranged. Other than these, it is the same as in FIG.

Here, the power receiving coupler 310A is waterproofed by the adhesive 400 in the same manner as in FIG. On the other hand, the power receiving coupler 310B is not waterproofed. Therefore, when water does not enter the inside of the housing 200, power can be supplied to both the power receiving couplers 310A and 310B, so that a response from both of them can be obtained. However, when water enters the inside of the housing 200, the dielectric constant increases significantly because water enters between the electrode plate of the power receiving coupler 310B and the wall surface of the housing 200, so that the power receiving coupler 310B has a power receiving coupler 310B. You will not be able to receive power. As a result, although there is a response from the power receiving control unit 380A, a response from the power receiving control unit 380B cannot be obtained. Therefore, the presence or absence of inundation can be determined by examining the presence or absence of a response.

Further, in the above embodiment, the frequency of the alternating electric field generated by the power transmission device 100 is fixed, but for example, the frequency may be finely adjusted within an allowable range. According to such a configuration, for example, the power supply efficiency can be improved by adjusting so that the active power is increased.

Further, in the above embodiment, the alternating electric field excitation unit 140 is made to excite the electric field by two electrodes, but one of the two electrodes is omitted and the output of the power amplification unit 120 is directly connected to the housing 200. However, the alternating electric field may be excited.

Further, in the above embodiment, one power transmission device 100 is provided, but by providing a plurality of power transmission devices 100 and adjusting so that the phases of the alternating electric fields generated by these are synchronized, a plurality of power transmission devices are provided. It can also be powered from 100.

Further, in the above embodiment, the sensor 360 arranged inside the housing 200 is a sensor that detects water, but other sensors that detect the state inside the housing 200 (for example, a temperature sensor, humidity). A sensor (sensor, chemical substance detection sensor) may be arranged, or a sensor for detecting the state of the device housed inside the housing 200 (for example, a sensor for detecting the operating state of the information processing device) may be arranged. You may try to do it.

Further, in the above embodiment, the power receiving device 300 is arranged in the housing 200. For example, a chemical storage for storing chemicals is used as the housing 200, and water enters the chemical storage. You may try to detect what you have done.

Further, in the above embodiment, although the case where the housing 200 is made of metal has been described as an example, the housing 200 may be made of resin. Further, it may be configured by using both a metal and a resin.

Further, as an example of the housing 200, for example, a closure for interconnecting cable core wires such as an optical cable and a coaxial cable may be used. Since the closure is often installed outdoors, there is a higher possibility that water will enter compared to when it is installed indoors, but even if water enters, the power receiving device placed inside the closure Can transmit power. Such closures are grounded by being installed directly on the ground or the like.

Further, the power receiving coupler 310 and the circuit board 311 shown in FIG. 9 may be waterproofed by covering them with, for example, a card-shaped housing made of an insulating member such as resin.

Further, in the above embodiment, the power transmission device 100 and the power receiving device 300 use rectangular electrodes, but electrodes having other shapes may be used.

Further, in the above embodiment, the adhesive 400 is used, but an annular insulating member such as an O-ring may be used instead of the adhesive.

100 Transmission device 101 Circuit board 110 Oscillator 120 Power amplification 130 Power supply 140 Alternate electric field excitation section 142, 143 Electrode 150 Control section 160 Receiver 170 Transmission control section 200 Housing 210 Lid 213 Electrode 220 Main body 300 Power receiving device 310 310A, 310B Power receiving coupler 311 Circuit board 312, 313 Electrode 320 Rectifying unit 330 Power storage unit 340 Stabilized power supply 350 Control unit 360 Sensor 370 Transmission unit 380, 380A, 380B Power receiving control unit 400 Adhesive 420 Metal laminate film 430 Metal laminate film 500 ~ 503 Conductive plate 700 Transmission device 710 Reflected wave receiver 800 Power receiver 810 Modulator 900 Transmission device 910 Receiver 920 Transmitter 930 Converter 1000 Power receiver 1010 Receiver 1020 Transmitter 1030 Converter

Claims (13)

In a power transmission / reception system in which power is supplied to a power receiving device arranged inside the housing from outside the housing by a power transmission device.
The power transmission device
An output means that outputs a signal of a predetermined frequency and
It has a power transmission coupler that excites an alternating electric field into the housing based on a signal of a predetermined frequency output from the output means.
The power receiving device is
A power receiving coupler that converts the alternating electric field excited to the housing into electric power,
A waterproof means for waterproofing the electrodes of the power receiving coupler and
A power transmission / reception system characterized by having. The power receiving coupler is arranged so that the electrodes face the inner wall surface of the housing, and the power receiving coupler is arranged.
An adhesive is applied around the electrodes of the power receiving coupler, and the inner wall surface and the electrodes are adhered in a state of being separated by a predetermined distance.
The power transmission / reception system according to claim 1. The power transmission / reception system according to claim 1, wherein the power reception coupler is configured such that at least a surface on which the electrodes are arranged is covered with an intermediate. The power transmission / reception system according to claim 3, wherein the waterproof means is configured between the electrode and the intermediate. The power transmission / reception system according to any one of claims 1 to 3, wherein the waterproof means is configured between the electrode and the housing. The waterproofing means includes holes, grooves, plugs or valves for draining infiltrated water.
The power transmission / reception system according to claim 4 or 5. The power transmission / reception system according to claim 4, wherein the waterproof means is an O-ring. The power transmission / reception system according to claim 3, wherein the intermediate is composed of a metal laminated film. The power receiving device includes a sensor that detects a state inside the housing and
It has a transmission means for transmitting information indicating a state detected by the sensor.
The power transmission / reception system according to any one of claims 1 to 8, wherein the sensor and the transmission means operate by the electric power received by the power reception coupler. The sensor is a water sensor that detects water in the housing.
The transmitting means transmits information about water detected by the water sensor.
The power transmission / reception system according to claim 9. Having another power receiving device that does not have the waterproof means,
The presence or absence of water in the housing is determined based on the information transmitted from the power receiving device and other power receiving devices.
The power transmission / reception system according to any one of claims 1 to 10. The power transmission / reception system according to any one of claims 1 to 11, wherein the housing is a closure for interconnecting cable core wires. In a power transmission / reception system in which power is supplied to a power receiving device arranged inside the housing from outside the housing by a power transmission device.
The power transmission device
An output means that outputs a signal of a predetermined frequency and
A power transmission coupler that excites an alternating magnetic field based on a signal of a predetermined frequency output from the output means.
It has a first conversion means for converting an alternating magnetic field output from the power transmission coupler into an alternating electric field.
The power receiving device is
A second conversion means that converts an alternating electric field into an alternating magnetic field,
A power receiving coupler that converts an alternating magnetic field into electric power,
A sealing means for sealing the electrode that outputs the alternating electric field of the second conversion means, and a sealing means.
A power transmission / reception system characterized by having.