JP6839803B2 - lighting equipment - Google Patents

Description

The present invention relates to a luminaire that transmits power wirelessly.

Conventionally, a lighting fixture that transmits electric power wirelessly is known (for example, Patent Document 1). This type of luminaire includes a primary coil connected to a power source, a secondary coil that is wirelessly transmitted from the primary coil, and a light source connected to the secondary coil. As a result, power can be transmitted wirelessly between the power source and the light source.

Japanese Unexamined Patent Publication No. 2013-85467

However, in the lighting equipment disclosed in Patent Document 1, since power is transmitted between the primary coil and the secondary coil by inductive power transfer, as the distance between the primary coil and the secondary coil increases, the distance between the primary coil and the secondary coil increases. , The power transmission efficiency from the primary coil to the secondary coil drops sharply. Therefore, in order to efficiently transmit power to the light source, it is necessary to arrange the secondary coil in the vicinity of the primary coil.

Therefore, the present invention is a lighting fixture that wirelessly transmits power between a power feeding device and a power receiving device having a light source, and increases the distance between the power feeding device and the power receiving device while suppressing a decrease in power transmission efficiency. The purpose is to provide a lighting fixture that can be used.

In order to achieve the above object, one aspect of the lighting equipment according to the present invention is a power supply device having a high frequency power supply and a transmission coil connected to the high frequency power supply, a relay coil, and the relay coil. It has a capacitor element connected to the relay resonator, which is transmitted from the power feeding device by using the magnetic field resonance between the power transmission coil and the relay coil, and is connected to the power receiving coil and the power receiving coil. It has a light source to be used, and includes a power receiving device that receives power from the power feeding device via the relay resonator using magnetic field resonance between the relay coil and the power receiving coil.

According to one aspect of the present invention, it is a lighting fixture that wirelessly transmits power between a power feeding device and a power receiving device having a light source, and is between the power feeding device and the power receiving device while suppressing a decrease in power transmission efficiency. We can provide lighting equipment that can increase the distance.

FIG. 1 is a schematic circuit diagram showing a circuit configuration of a lighting fixture according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing a schematic structure of the luminaire according to the first embodiment. FIG. 3 is a schematic circuit diagram showing a circuit configuration of the lighting fixture according to the second embodiment. FIG. 4 is a schematic cross-sectional view showing a schematic structure of the luminaire according to the second embodiment. FIG. 5 is a schematic circuit diagram showing a circuit configuration of the lighting fixture according to the third embodiment. FIG. 6 is a schematic cross-sectional view showing a schematic structure of the luminaire according to the third embodiment. FIG. 7 is a schematic circuit diagram showing a circuit configuration of the lighting fixture according to the fourth embodiment. FIG. 8 is a schematic cross-sectional view showing a schematic structure of the luminaire according to the fourth embodiment. FIG. 9 is a cross-sectional view showing a schematic structure of a cap portion according to a modified example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement positions of the components, connection forms, etc. shown in the following embodiments are examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present invention will be described as arbitrary components.

It should be noted that each figure is a schematic view and is not necessarily exactly illustrated. Further, in each figure, the same reference numerals are given to substantially the same configurations, and duplicate description will be omitted or simplified.

(Embodiment 1)
[1-1. overall structure]
First, the overall configuration of the lighting fixture 10 according to the embodiment will be described with reference to the drawings.

FIG. 1 is a schematic circuit diagram showing a circuit configuration of the lighting fixture 10 according to the present embodiment. FIG. 2 is a schematic cross-sectional view showing a schematic structure of the luminaire 10 according to the present embodiment. In FIG. 2, the construction material 90 in which the luminaire 10 is installed is also shown. In FIG. 2, for simplification, only a part of the circuit of the luminaire 10 is shown.

As shown in FIG. 1, the luminaire 10 includes a power feeding device 20, a relay resonator 40, and a power receiving device 60. Further, as shown in FIG. 2, the luminaire 10 further includes a shade portion 50, a light emitting portion 70, a cover 72, a first holding member 31, a second holding member 32, and an interval adjuster 25. To be equipped. Hereinafter, each component of the lighting fixture 10 will be described.

[1-1-1. Power supply device]
The power feeding device 20 is a device that wirelessly transmits power to the power receiving device 60 via the relay resonator 40, and has a high frequency power supply 21, a power transmission coil 23, and a capacitor element 22 as shown in FIG.

The high frequency power supply 21 is a power supply that applies a high frequency voltage to the power transmission coil 23. The high frequency power supply 21 is realized by, for example, an inverter circuit. The frequency of the high frequency voltage output by the high frequency power supply 21 is appropriately set according to the characteristics of the power transmission coil 23 and the like. The frequency of the high frequency voltage is, for example, about 100 kHz or more and 10 MHz or less.

The power transmission coil 23 is a loop coil connected to the high frequency power supply 21. Characteristics such as the inductance of the power transmission coil 23 are appropriately set based on the frequency of the voltage output from the high frequency power supply 21 and the like. As shown in FIG. 2, the power transmission coil 23 is arranged on a construction material 90 such as a ceiling plate. Although omitted in FIG. 2, components other than the power transmission coil 23 of the power feeding device 20 may also be arranged in the construction material 90.

The capacitor element 22 is a capacitance element connected to the power transmission coil 23. The capacitor element 22 forms a resonance circuit together with the power transmission coil 23. The capacitance of the capacitor element 22 is set so that the resonance frequency of the resonance circuit formed with the power transmission coil 23 is about the same as the frequency of the voltage output from the high frequency power supply 21.

[1-1-2. Relay resonator]
The relay resonator 40 is a circuit that relays power transmission between the power feeding device 20 and the power receiving device 60. The relay resonator 40 has a relay coil 43 and a capacitor element 42 connected to the relay coil 43, and is transmitted from the power feeding device 20 by using the magnetic field resonance between the transmission coil 23 and the relay coil 43. To. Here, the magnetic field resonance refers to a phenomenon in which the vibration of the magnetic field generated by the resonance in one resonance circuit is transmitted to the other resonance circuit between two resonance circuits having substantially the same resonance frequency. By using magnetic field resonance, power can be transmitted with higher efficiency over long distances than when inductive power transfer is used.

The relay coil 43 is a loop coil that forms a resonance circuit together with the capacitor element 42. The characteristics such as the inductance of the relay coil 43 are appropriately set based on the frequency of the voltage output from the high frequency power supply 21 and the like. Further, the relay coil 43 is arranged at a position where the magnetic field resonates with the power transmission coil 23. For example, the relay coil 43 is arranged so that the central axis of the loop-shaped portion thereof substantially coincides with the central axis of the loop-shaped portion of the power transmission coil 23. The diameters of the relay coil 43 and the power transmission coil 23 described above are not particularly limited, but the diameter of the relay coil 43 may be smaller than the diameter of the power transmission coil 23. As a result, it is possible to suppress a decrease in power transmission efficiency when the position of the relay coil 43 is displaced with respect to the power transmission coil 23.

The capacitor element 42 is connected to the relay coil 43 and forms a resonance circuit together with the relay coil 43. The capacitance of the capacitor element 42 is set so that the resonance frequency of the resonance circuit formed with the relay coil 43 is about the same as the frequency of the voltage output from the high frequency power supply 21.

[1-1-3. Power receiving device]
The power receiving device 60 is a device that wirelessly receives power from the power feeding device 20 via the relay resonator 40. The power receiving device 60 has a power receiving coil 63 and a light source 68 connected to the power receiving coil 63, and uses magnetic field resonance between the relay coil 43 and the power receiving coil 63 to perform a relay resonator 40 from the power feeding device 20. Receives power via. In the present embodiment, the power receiving device 60 further includes a rectifier circuit 66 and a DC-DC converter 67.

The power receiving coil 63 is a loop coil that forms a resonance circuit together with the capacitor element 62. The characteristics such as the inductance of the power receiving coil 63 are appropriately set based on the frequency of the voltage output from the high frequency power supply 21 and the like. Further, the power receiving coil 63 is arranged at a position where the magnetic field resonates with the relay coil 43. For example, the power receiving coil 63 is arranged so that the central axis of the loop-shaped portion thereof substantially coincides with the central axis of the loop-shaped portion of the relay coil 43. The diameter of the power receiving coil 63 is not particularly limited, but may be less than or equal to the diameter of the relay coil 43. As a result, it is possible to suppress a decrease in power transmission efficiency when the position of the power receiving coil 63 is displaced with respect to the relay coil 43.

The capacitor element 62 is connected to the power receiving coil 63 and forms a resonance circuit together with the power receiving coil 63. The capacitance of the capacitor element 62 is set so that the resonance frequency of the resonance circuit formed with the power receiving coil 63 is about the same as the frequency of the voltage output from the high frequency power supply 21. The capacitor element 62 and the above-mentioned capacitor elements 22 and 42 may be, for example, an element such as a chip capacitor or a stray capacitance.

The rectifier circuit 66 is a circuit that rectifies the high frequency power received by the power receiving coil 63. The rectifier circuit includes, for example, a diode bridge.

The DC-DC converter 67 is a circuit that converts and outputs the voltage of the DC power output from the rectifier circuit 66. The DC-DC converter 67 outputs a voltage suitable for the light source 68.

The light source 68 emits illumination light using the electric power transmitted from the power feeding device 20. In the present embodiment, the light source 68 is a light emitting module having an LED (Light Emitting Diode). The light source 68 is configured to emit, for example, white light.

[1-1-4. Kasabe]
The cap 50 shown in FIG. 2 is a member arranged between the power feeding device 20 and the power receiving device 60 and in which the relay resonator 40 is arranged. In the present embodiment, the relay resonator 40 is arranged inside the cap 50. In this way, since the relay resonator 40 is covered with the shade portion 50, the relay resonator 40 can be protected. The cap 50 is made of, for example, a non-metallic and non-magnetic material. The cap portion 50 may be formed of, for example, an electrically insulating resin.

As shown in FIG. 2, the shade portion 50 is located on the upper side in the vertical direction in the installed state of the luminaire 10, and has an inclined surface 52 inclined downward in the vertical direction. In the present embodiment, the cap portion 50 has a conical shape, and the side surface of the conical portion corresponds to the inclined surface 52. As a result, even if some foreign matter is placed on the cap 50, the foreign matter can be dropped along the inclined surface 52. For example, when a metal piece is placed on the cap 50, electric power is lost because an eddy current is generated in the metal piece by a high frequency magnetic field. In addition, the cap 50 may be damaged by heat generated by the eddy current of the metal piece. In the present embodiment, since the cap portion 50 has the inclined surface 52, the occurrence of such a problem can be suppressed.

Further, the shade portion 50 may have a function of reflecting the illumination light emitted from the light source 68 downward, for example. For example, by forming the cap portion 50 with a white resin, the cap portion 50 can reflect the illumination light.

[1-1-5. Light emitting part]
The light emitting unit 70 is a member in which the power receiving coil 63 and the light source 68 are arranged. In the present embodiment, the light emitting unit 70 is a housing that houses the power receiving coil 63. Although omitted in FIG. 2, a capacitor element 62, a rectifier circuit 66, and a DC-DC converter 67 may be arranged in the light emitting unit 70. Further, in the present embodiment, the light source 68 is arranged on the surface located on the lower side in the vertical direction in the installed state of the light emitting unit 70. As a result, the illuminating light can be emitted downward from the luminaire 10 in the vertical direction. The light emitting portion 70 is formed of, for example, a non-metal and non-magnetic material. The light emitting portion 70 may be formed of, for example, an electrically insulating resin.

[1-1-6. cover]
The cover 72 is a member that covers the light source 68. In this embodiment, the cover 72 is arranged in the light emitting unit 70. The cover 72 is made of a translucent material such as glass or resin. Further, the cover 72 may have a light diffusion function.

[1-1-7. First holding member]
The first holding member 31 is a member that holds the relay resonator 40. As a result, the relay resonator 40 can be arranged at a desired position. In the present embodiment, the first holding member 31 is a filamentous member that holds the relay resonator 40 via the cap 50. One end of the first holding member 31 is fixed to the power feeding device 20 or its periphery, and the other end is fixed to the cap portion 50. As a result, the relay resonator 40 is suspended by the first holding member 31. Therefore, the relay resonator 40 can be suspended from a construction material 90 such as a ceiling plate. In the present embodiment, one end of the first holding member 31 is fixed to the interval adjuster 25 described later.

The first holding member 31 is made of, for example, a non-metal and non-magnetic material. Further, at least a part of the first holding member 31 may be transparent or translucent. For example, a transparent or translucent material such as fishing line may be used as the first holding member 31. As a result, the first holding member 31 becomes inconspicuous. Further, in the lighting fixture 10, since there is no wiring for feeding between the power feeding device 20 and the relay resonator 40, the relay resonator 40 can be made to appear as if it is floating in the air. As described above, the lighting fixture 10 having a characteristic appearance can be realized.

Further, the first holding member 31 may be expandable and contractible. This makes it possible to improve the degree of freedom in arranging the relay resonator 40. The means for adjusting the length of the first holding member 31 is not particularly limited, but in the present embodiment, the length is adjusted by the interval adjuster 25 described later.

[1-1-8. Second holding member]
The second holding member 32 is a member that holds the power receiving device 60. As a result, the power receiving device 60 can be arranged at a desired position. In the present embodiment, the second holding member 32 is a filamentous member that holds the power receiving device 60 via the light emitting unit 70. One end of the second holding member 32 is fixed to the relay resonator 40, and the other end is fixed to the light emitting unit 70. As a result, the power receiving device 60 is suspended by the second holding member 32 via the light emitting unit 70. Therefore, the power receiving device 60 can be suspended from a building material 90 such as a ceiling board.

The second holding member 32 is made of the same material as the first holding member 31. Further, at least a part of the second holding member 32 may be transparent or translucent. As a result, the second holding member 32 can also have the same effect as the first holding member 31.

Further, the second holding member 32 may be expandable and contractible like the first holding member. This makes it possible to improve the degree of freedom in arranging the power receiving device 60. The length of the second holding member 32 is not particularly limited, but in the present embodiment, it may be adjusted by the same adjusting means as the interval adjuster 25 described later.

[1-1-9. Interval adjuster]
The interval adjuster 25 is a device that adjusts the interval between the power transmission coil 23 and the power reception coil 63. In the present embodiment, the interval adjuster 25 expands and contracts the first holding member 31. The configuration of the interval adjuster 25 is not particularly limited, but for example, the interval adjuster 25 is a reel capable of winding the thread-like first holding member 31. By adjusting the winding amount of the first holding member 31 by the interval adjuster 25, the first holding member 31 can be expanded and contracted. In the example shown in FIG. 2, the interval adjuster 25 is arranged in the vicinity of the power feeding device 20 to expand and contract the first holding member 31, but the arrangement of the interval adjuster 25 is not particularly limited. For example, the interval adjuster 25 may be arranged at the cap 50 (or near the relay resonator 40).

Further, the interval adjuster 25 may be arranged in the shade portion 50 (or near the relay resonator 40) or the light emitting portion 70 (or near the power receiving device 60) to expand and contract the second holding member 32. Further, two interval adjusters 25 may be arranged on the luminaire 10 to expand and contract each of the first holding member 31 and the second holding member 32.

[1-2. motion]
Next, the operation of the lighting fixture 10 according to the present embodiment will be described.

In the luminaire 10, first, a high frequency voltage is applied to the power transmission coil 23 by the high frequency power source 21 of the power feeding device 20. As a result, a high-frequency electromagnetic field is generated in the power transmission coil 23. Here, the relay resonator 40 is arranged at a position where it can resonate with the high frequency electromagnetic field in a magnetic field, and the resonance frequency of the relay resonator 40 is set to the frequency of the high frequency electromagnetic field to the extent that the magnetic field can resonate with the high frequency electromagnetic field. near. Therefore, power is transmitted from the power feeding device 20 to the relay resonator 40 by using the magnetic field resonance between the transmission coil 23 and the relay coil 43.

Further, the power receiving device 60 is arranged at a position where the magnetic field can resonate with the high frequency electromagnetic field resonating in the relay resonator 40, and the resonance frequency of the power receiving device 60 is such that the high frequency electromagnetic field can resonate with the high frequency electromagnetic field. It is close to the frequency of. Therefore, power is transmitted from the relay resonator 40 to the power receiving device 60 by using the magnetic field resonance between the relay coil 43 and the power receiving coil 63.

Subsequently, in the power receiving device 60, the received high frequency power is rectified by the rectifier circuit 66. The voltage of the DC power output from the rectifier circuit 66 is converted by the DC-DC converter 67. Then, the DC voltage output from the DC-DC converter 67 is applied to the light source 68, so that the light source 68 emits illumination light.

As described above, in the lighting fixture 10, since the power transmission coil 23 and the power receiving coil 63 are transmitted using magnetic field resonance, the power transmission efficiency between the coils is higher than that in the case of power transmission using the induced power transfer. high. Further, even when the distance between the coils is increased, the decrease in power transmission efficiency can be suppressed. Further, in the lighting fixture 10, the distance between the power transmission coil 23 and the power reception coil 63 can be further increased by relaying the power transmission from the power transmission coil 23 to the power reception coil 63 by the relay coil 43.

[1-3. Summary]
As described above, the luminaire 10 according to the present embodiment includes a high-frequency power supply 21 and a power feeding device 20 having a power transmission coil 23 connected to the high-frequency power supply 21. The lighting fixture 10 further has a relay coil 43 and a capacitor element 42 connected to the relay coil 43, and transmits power from the power supply device 20 using magnetic field resonance between the power transmission coil 23 and the relay coil 43. The relay resonator 40 is provided. The luminaire 10 further has a power receiving coil 63 and a light source 68 connected to the power receiving coil 63, and relay resonance from the power feeding device 20 using the magnetic field resonance between the relay coil 43 and the power receiving coil 63. A power receiving device 60 for receiving power via the device 40 is provided.

As described above, in the lighting fixture 10, since the power transmission coil 23 and the power receiving coil 63 are transmitted using magnetic field resonance, the power transmission efficiency between the coils is higher than that in the case of power transmission using the induced power transfer. high. Further, even when the distance between the coils is increased, the decrease in power transmission efficiency can be suppressed. Further, in the lighting fixture 10, the distance between the power transmission coil 23 and the power reception coil 63 can be further increased by relaying the power transmission from the power transmission coil 23 to the power reception coil 63 by the relay coil 43.

Further, the luminaire 10 may further include a cap 50 which is arranged between the power feeding device 20 and the power receiving device 60 and in which the relay resonator 40 is arranged.

Thereby, for example, when the relay resonator 40 is covered with the cap portion 50, the relay resonator 40 can be protected by the cap portion 50.

Further, in the luminaire 10, the shade portion 50 has an inclined surface 52 that is located on the upper side in the vertical direction and is inclined downward in the vertical direction in the installed state of the luminaire 10.

As a result, even if some foreign matter is placed on the cap 50, the foreign matter can be dropped along the inclined surface 52.

Further, the luminaire 10 may further include a first holding member 31 for holding the relay resonator 40 and a second holding member 32 for holding the power receiving device 60.

As a result, the relay resonator 40 and the power receiving device 60 can be arranged at desired positions.

Further, in the luminaire 10, the relay resonator 40 and the power receiving device 60 may be suspended by the first holding member 31 and the second holding member 32, respectively.

As a result, the relay resonator 40 and the power receiving device 60 can be suspended from a building material 90 such as a ceiling plate.

Further, in the luminaire 10, at least a part of the first holding member 31 and the second holding member 32 may be transparent.

As a result, at least one of the first holding member 31 and the second holding member 32 becomes inconspicuous. Further, in the lighting fixture 10, since there is no wiring for feeding between the power feeding device 20, the relay resonator 40, and the power receiving device 60, at least one of the relay resonator 40 and the power receiving device 60 floats in the air. You can make it look as if it were. As described above, the lighting fixture 10 having a characteristic appearance can be realized.

Further, in the luminaire 10, at least one of the first holding member 31 and the second holding member 32 may be expandable and contractible.

This makes it possible to improve the degree of freedom in arranging at least one of the relay resonator 40 and the power receiving device 60.

Further, in the lighting fixture 10, the diameter of the relay coil 43 may be smaller than the diameter of the power transmission coil 23, and the diameter of the power receiving coil 63 may be smaller than the diameter of the relay coil 43.

As a result, it is possible to suppress a decrease in power transmission efficiency when the positions of the relay coil 43 and the power receiving coil 63 are displaced with respect to the power transmission coil 23.

(Embodiment 2)
Next, the lighting equipment according to the second embodiment will be described. The luminaire according to the first embodiment is different from the luminaire 10 according to the first embodiment in that the relay resonator has an auxiliary light source. Hereinafter, the luminaire according to the present embodiment will be described with reference to the drawings, focusing on the differences from the luminaire 10 according to the first embodiment.

FIG. 3 is a schematic circuit diagram showing a circuit configuration of the luminaire 110 according to the present embodiment. In FIG. 3, the circuit diagram of the power feeding device 20 and the power receiving device 60 having the same configuration as the lighting fixture 10 according to the first embodiment is omitted. FIG. 4 is a schematic cross-sectional view showing a schematic structure of the luminaire 110 according to the present embodiment.

As shown in FIG. 3, the luminaire 110 according to the present embodiment includes a power feeding device 20, a relay resonator 140, and a power receiving device 60, similarly to the luminaire 10 according to the first embodiment.

The relay resonator 140 according to the present embodiment has a relay coil 43 and a capacitor element 42, similarly to the relay resonator 40 according to the first embodiment. The relay resonator 140 further includes a rectifier circuit 46, a DC-DC converter 47, and an auxiliary light source 48.

The rectifier circuit 46 is a circuit that rectifies the high-frequency power received by the relay coil 43. The rectifier circuit includes, for example, a diode bridge.

The DC-DC converter 47 is a circuit that converts and outputs the voltage and current of the DC power output from the rectifier circuit 46. The DC-DC converter 47 outputs a DC voltage having a voltage suitable for the auxiliary light source 48.

The auxiliary light source 48 emits illumination light using the electric power transmitted from the power feeding device 20. In this embodiment, the auxiliary light source 48 is a light emitting module having an LED. The auxiliary light source 48 is configured to emit, for example, white light. The auxiliary light source 48 may emit illumination light having a color temperature (or light color) different from that of the illumination light emitted from the light source 68.

The auxiliary light source 48 may be arranged inside the cap 50 as shown in FIG. 4, for example. In this case, by forming at least a part of the cap portion 50 with a translucent member, the illumination light from the auxiliary light source 48 can be emitted to the outside of the cap portion 50. The arrangement of the auxiliary light source 48 is not limited to this. The auxiliary light source 48 may be exposed to the outside of the shade portion 50, for example. In this case, the cap portion 50 can be formed of a non-transmissive member. Therefore, the relay coil 43 or the like arranged inside the cap 50 can be made difficult to see from the outside. Therefore, it is possible to realize a lighting fixture 110 having an excellent design.

As described above, the luminaire 110 according to the present embodiment has an auxiliary light source 48 connected to the relay coil 43 in addition to each component of the relay resonator 40 according to the first embodiment.

As a result, in the luminaire 110, the illumination light can be emitted not only from the light emitting unit 70 but also from the shade unit 50. Therefore, it is possible to improve the degree of freedom in the emission position and intensity distribution of the illumination light. Further, by adjusting each color temperature (or light color) of the light source 68 and the auxiliary light source 48, the degree of freedom of the color temperature (or light color) distribution of the illumination light can be improved.

(Embodiment 3)
Next, the lighting equipment according to the third embodiment will be described. The luminaire according to the first embodiment is the luminaire according to the first embodiment in that the intensity of the electric power transmitted from the power feeding device is adjusted based on the distance between the power transmission coil and the power receiving coil. Different from 10. Hereinafter, the luminaire according to the present embodiment will be described with reference to the drawings, focusing on the differences from the luminaire 10 according to the first embodiment.

FIG. 5 is a schematic circuit diagram showing a circuit configuration of the lighting fixture 210 according to the present embodiment. FIG. 6 is a schematic cross-sectional view showing a schematic structure of the luminaire 210 according to the present embodiment.

As shown in FIG. 5, the luminaire 210 according to the present embodiment includes a power feeding device 220, a relay resonator 40, and a power receiving device 60, similarly to the luminaire 10 according to the first embodiment.

The power feeding device 220 according to the present embodiment has a high frequency power supply 21, a power transmission coil 23, and a capacitor element 22, similarly to the power feeding device 20 according to the first embodiment. The power feeding device 220 further includes a control circuit 26 and a distance measuring sensor 27.

The distance measuring sensor 27 is a sensor that measures the distance between the power transmission coil 23 and the power receiving coil 63. The distance measuring sensor 27 outputs a signal corresponding to the measured distance to the control circuit 26. The distance measuring sensor 27 does not necessarily have to measure the distance itself between the power transmission coil 23 and the power receiving coil 63, and may measure the distance corresponding to the distance. For example, in the present embodiment, as the distance corresponding to the distance, the distance measuring sensor 27 determines the distance between the power feeding device 220 having the power transmission coil 23 and the light emitting unit 70 in which the power receiving coil 63 is arranged. measure. The sensor used as the distance measuring sensor 27 is not particularly limited. For example, as the distance measuring sensor 27, a sensor that measures a distance based on the flight time of an optical pulse may be used. Further, the distance may be measured by measuring the amount of change in the lengths of the first holding member 31 and the second holding member 32 in the interval adjuster 25. That is, the interval adjuster 25 may be used as the distance measuring sensor.

The control circuit 26 adjusts the intensity of the electric power transmitted from the power transmission coil 23 based on the distance measured by the distance measuring sensor 27. In the present embodiment, the control circuit 26 adjusts the strength of the electric power by adjusting at least one of the output voltage and the output frequency of the high frequency power supply 21. In this way, by controlling the output voltage of the high-frequency power supply 21, the strength of the high-frequency electromagnetic field output from the power transmission coil 23 can be controlled, so that the strength of the power received by the power receiving coil 63 can be adjusted. Further, by controlling the output frequency of the high-frequency power supply 21, the matching between the output frequency and the power transmission coil 23, the relay coil 43, and the power receiving coil 63 can be controlled, so that the power received by the power receiving coil 63 can be controlled. The strength can be adjusted.

The control circuit 26 is not particularly limited as long as it is a circuit capable of adjusting at least one of the output voltage and the output frequency of the high frequency power supply 21 based on the above distance. For example, the control circuit 26 may be realized by a microcomputer (MCU; Micro-Controller Unit) or the like. A microcomputer is a one-chip semiconductor having a ROM in which a program is stored, a RAM, a processor (CPU; Central Processing Unit) for executing the program, a timer, an input / output circuit including an A / D converter and a D / A converter, and the like. It is an integrated circuit.

In this way, in the lighting equipment 210, the distance measuring sensor 27 that measures the distance between the power transmission coil 23 and the power receiving coil 63 and the intensity of the electric power transmitted from the power transmission coil 23 are adjusted based on the distance. It has a control circuit 26 for the operation.

As a result, in the lighting fixture 210, when the distance between the power transmission coil 23 and the power reception coil 63 is changed and the power transmission efficiency from the power transmission coil 23 to the power reception coil 63 is changed, the power transmission efficiency is increased. The intensity of the power transmitted from the power transmission coil can be adjusted according to the change. For example, in the lighting fixture 210, the control circuit 26 may increase the intensity of the electric power transmitted from the power transmitting coil 23 as the distance between the power transmitting coil 23 and the power receiving coil 63 increases. When the distance increases, the power transmission efficiency decreases, but as described above, by increasing the strength of the power transmitted from the power transmission coil 23, the power transmitted to the power receiving coil 63 The change in strength can be reduced.

(Embodiment 4)
Next, the lighting equipment according to the fourth embodiment will be described. The luminaire according to the present embodiment is different from the luminaire 10 according to the first embodiment in that it includes a plurality of relay resonators. Hereinafter, the luminaire according to the present embodiment will be described with reference to the drawings, focusing on the differences from the luminaire 10 according to the first embodiment.

FIG. 7 is a schematic circuit diagram showing a circuit configuration of the luminaire 310 according to the present embodiment. FIG. 8 is a schematic cross-sectional view showing a schematic structure of the luminaire 310 according to the present embodiment.

As shown in FIG. 7, the luminaire 310 according to the present embodiment includes a power supply device 20 and a power receiving device 60, similarly to the luminaire 10 according to the first embodiment. On the other hand, the luminaire 310 is different from the luminaire 10 according to the first embodiment in that it includes two relay resonators 40a and 40b. Similar to the relay resonator 40 according to the first embodiment, the relay resonator 40a has a relay coil 43a and a capacitor element 42a, and the relay resonator 40b has a relay coil 43b and a capacitor element 42b. ..

Along with this, as shown in FIG. 8, the luminaire 310 includes two cap portions 50a and 50b in which the relay resonators 40a and 40b are arranged, respectively. The configurations of the two caps 50a and 50b are the same as those of the cap 50 according to the first embodiment. The caps 50a and 50b have, for example, the same distance between the power feeding device 20 and the cap 50a, the distance between the cap 50a and the cap 50b, and the distance between the cap 50b and the light emitting portion 70. It may be arranged so as to be.

Further, the luminaire 310 includes first holding members 31a and 31b for holding the relay resonators 40a and 40b, respectively. The configurations of the first holding members 31a and 31b are the same as those of the first holding member 31 according to the first embodiment.

In the present embodiment, the lighting fixture 310 including two relay resonators is shown as an example, but the number of relay resonators may be three or more.

As described above, the luminaire 310 according to the present embodiment includes a plurality of relay resonators. By relaying electric power with a plurality of relay resonators in this way, it is possible to further increase the distance between the power feeding device and the power receiving device while suppressing a decrease in power transmission efficiency.

(Modification example, etc.)
The lighting fixture according to the present invention has been described above based on the embodiment, but the present invention is not limited to the above embodiment.

For example, the cap portion 50 according to each of the above embodiments has shown an example in which the cap portion 50 is formed only of a non-metal and non-magnetic material, but the material of the cap portion 50 is not limited to this. Here, a modified example of the Kasabe 50 will be described with reference to the drawings. FIG. 9 is a cross-sectional view showing a schematic structure of the cap portion 450 according to the modified example. In FIG. 9, the relay coil 43 is also shown together with the shade portion 450. In the cap portion 450 shown in FIG. 9, when viewed from the power feeding device side (viewed from the upper side of FIG. 9), at least the portion 450R overlapping the relay coil 43 may be non-metal and non-magnetic. The other parts do not necessarily have to be non-metal and non-magnetic. Further, the magnetic bodies 44a and 44b may be arranged in a portion other than the portion 450R. As a result, the lines of magnetic force can be concentrated in the vicinity of the relay coil 43, so that the power transmission efficiency can be improved.

Further, in each of the above embodiments, the relay resonator and the power receiving device are held by the thread-shaped first holding member and the second holding member, but these holding members do not have to be thread-shaped. For example, these holding members may be columnar rigid bodies.

Further, in each of the above embodiments, the relay resonator and the power receiving device are suspended from the construction material 90, but the holding configuration of the relay resonator and the power receiving device is not limited to this. For example, it may be held by a first holding member and a second holding member made of a columnar rigid body arranged on a construction material such as a floor board.

Further, in the third embodiment, the control circuit 26 is realized by software by a microcomputer, but the control circuit 26 is composed of an A / D converter, a logic circuit, a gate array, a D / A converter, and the like. It may be realized by hardware by a dedicated electronic circuit.

Further, in each of the above embodiments, LEDs are exemplified as the light source 68 and the auxiliary light source 48, but as the light source and the auxiliary light source, a semiconductor light emitting element such as a semiconductor laser, an organic EL (Electro Luminescence) element, or an inorganic EL element is used. A solid-state light source other than the LED may be used.

In addition, it is realized by arbitrarily combining the components and functions in each embodiment within the range obtained by applying various modifications to each embodiment and the gist of the present invention. Forms are also included in the present invention.

For example, the auxiliary light source 48 according to the second embodiment may be applied to each of the lighting fixtures according to the third and fourth embodiments.

10, 110, 210, 310 Lighting equipment 20, 220 Power supply device 21 High frequency power supply 22, 42, 42a, 42b, 62 Capacitor element 23 Transmission coil 26 Control circuit 27 Distance measuring sensor 31, 31a, 31b First holding member 32 (Ii) Holding members 40, 40a, 40b, 140 Relay resonator 43, 43a, 43b Relay coil 48 Auxiliary light source 50, 50a, 50b, 450 Capacitor 52 Inclined surface 60 Power receiving device 63 Power receiving coil 68 Light source

Claims (12)

A high-frequency power supply and a power supply device having a power transmission coil connected to the high-frequency power supply,
A relay resonator having a relay coil and a capacitor element connected to the relay coil and being transmitted from the power feeding device by using the magnetic field resonance between the power transmission coil and the relay coil.
A power receiving device having a power receiving coil and a light source connected to the power receiving coil, and receiving power from the power feeding device via the relay resonator using magnetic field resonance between the relay coil and the power receiving coil. and,
A lighting fixture provided between the power feeding device and the power receiving device and having a cap portion on which the relay resonator is arranged. further,
The first holding member that holds the relay resonator and
The luminaire according to claim 1, further comprising a second holding member for holding the power receiving device. A high-frequency power supply and a power supply device having a power transmission coil connected to the high-frequency power supply,
A relay resonator having a relay coil and a capacitor element connected to the relay coil and being transmitted from the power feeding device by using the magnetic field resonance between the power transmission coil and the relay coil.
A power receiving device having a power receiving coil and a light source connected to the power receiving coil, and receiving power from the power feeding device via the relay resonator using magnetic field resonance between the relay coil and the power receiving coil. and,
The first holding member that holds the relay resonator and
A second holding member for holding the power receiving device is provided.
The relay resonator and the power receiving device are lighting fixtures suspended by the first holding member and the second holding member, respectively. A high-frequency power supply and a power supply device having a power transmission coil connected to the high-frequency power supply,
A relay resonator having a relay coil and a capacitor element connected to the relay coil and being transmitted from the power feeding device by using the magnetic field resonance between the power transmission coil and the relay coil.
A power receiving device having a power receiving coil and a light source connected to the power receiving coil, and receiving power from the power feeding device via the relay resonator using magnetic field resonance between the relay coil and the power receiving coil. and,
The first holding member that holds the relay resonator and
A second holding member for holding the power receiving device is provided.
A luminaire in which at least one of the first holding member and the second holding member is expandable and contractible. The luminaire according to any one of claims 2 to 4, wherein at least a part of the first holding member and the second holding member is transparent. The luminaire according to claim 3 or 4 , further comprising a shade portion that is arranged between the power feeding device and the power receiving device and in which the relay resonator is arranged. The luminaire according to any one of claims 1, 2 and 6, wherein the shade portion is located on the upper side in the vertical direction and has an inclined surface inclined downward in the vertical direction in the installed state of the luminaire. The luminaire according to any one of claims 1 to 7 , wherein the relay resonator further has an auxiliary light source connected to the relay coil. The power feeding device further
A distance measuring sensor that measures the distance between the power transmission coil and the power reception coil,
The luminaire according to any one of claims 1 to 8, further comprising a control circuit for adjusting the intensity of electric power transmitted from the power transmission coil based on the distance. The luminaire according to claim 9, wherein the control circuit adjusts the intensity of the electric power by adjusting at least one of the output voltage and the output frequency of the high frequency power supply. The luminaire according to claim 9 or 10, wherein the control circuit increases the intensity of the electric power as the distance increases. The diameter of the relay coil is smaller than the diameter of the power transmission coil.
The luminaire according to any one of claims 1 to 11, wherein the diameter of the power receiving coil is equal to or less than the diameter of the relay coil.

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