JP6820756B2 - Power supply system and power supply method - Google Patents

Description

The present invention relates to a power feeding system and a power feeding method.

In recent years, the development of a non-contact power transmission system that transmits power from a power transmission device to a power receiving device in a non-contact manner has been promoted. Some non-contact power transmission systems use a feeder for the power transmission device and transmit power from the feeder to the power receiving device in a non-contact manner (see, for example, Patent Documents 1 and 2 and Non-Patent Document 1 below). ).

In such a non-contact power transmission system, if the impedance at the end of the feeder does not match the impedance of the feeder, a reflected wave is generated at the end of the feeder. When a reflected wave is generated, a standing wave is generated in the feeder line due to the reflected wave and the traveling wave toward the end of the feeder line. In the standing wave, the waveform does not move and the antinode and the node of the wave are fixed, so that power cannot be supplied in the portion close to the node of the standing wave. As a technique for improving such a situation, for example, there are techniques disclosed in Patent Documents 1 and 2 and Non-Patent Document 1.

Patent Document 1 discloses a technique for suppressing the generation of a standing wave by matching the impedance on the end side of the feeder line with the impedance on the feeder line side. In Patent Document 2, the standing wave generated in the feeding line includes two types of standing waves, a standing wave due to an electric field and a standing wave due to a magnetic field, and these standing waves are due to an electric field. It is disclosed that the standing wave due to the magnetic field becomes an antinode at the position where the standing wave becomes a node, and the standing wave due to the magnetic field becomes an antinode at the position where the standing wave due to the electric field becomes an antinode. Patent Document 2 discloses a technique for receiving power by selecting whichever is higher, the electric field level or the magnetic field level, by utilizing such a relationship.

In Non-Patent Document 1, two feeders are prepared, and two feeders are provided so that the antinode of the standing wave generated in the other feeder appears at the position of the node of the standing wave generated in one feeder. Discloses a technique for mitigating power fluctuations due to standing waves by arranging and synthesizing the power received from both feeders.

Japanese Unexamined Patent Publication No. 2013-162625 Japanese Unexamined Patent Publication No. 2005-455326

Takuya Maekawa, "Stabilization of Power Received in Parallel Two-Wire Wireless Power Supply", Master's Thesis, NAIST-IS-MT1451094, Nara Institute of Science and Technology, February 4, 2016

However, the technique described in Patent Document 1 requires a power regenerator to be provided at the end of the feeder line, and the technique described in Patent Document 2 has two types of coupling, an electric field coupler and a magnetic field coupler, for each carrier. It is necessary to provide a device, and in the technique described in Non-Patent Document 1, it is necessary to provide two feeding lines. Therefore, the configuration of each technology becomes complicated, which causes an increase in cost.

Therefore, an object of the present invention is to provide a power supply system and a power supply method capable of supplying stable power with a simple configuration using a power supply line.

The feeding system according to one aspect of the present invention is formed in a loop shape, and a feeding line that supplies power to the power receiving device in a non-contact manner and a plurality of high-frequency power supplies that generate a traveling wave for supplying power to the feeding line. It is provided with a traveling wave generator having the above.

According to this aspect, by forming the feeder in a loop shape, it is possible to suppress the generation of a standing wave due to the reflected wave and then generate a traveling wave for power supply in the feeder by a plurality of high-frequency power supplies. Therefore, it is possible to uniformly supply electric power along the feeder line.

In the above aspect, the positions of the plurality of high frequency power supplies may be determined so that the phases of the high frequencies output from the respective high frequency power supplies are synchronized.

According to this aspect, in the loop-shaped feeder, the phases of the high frequencies output from the respective high-frequency power supplies can be synchronized, so that the generation of standing waves can be suppressed more reliably.

In the above embodiment, the positions of the plurality of high frequency power supplies are determined so that the phase of the high frequency output from each high frequency power supply is synchronized with one of the two waves traveling in opposite directions on the feeder. It may be.

According to this aspect, the phase of the high frequency output from each high frequency power source can be synchronized with one of the two traveling waves in opposite directions on the feeder line, and the traveling wave is generated in a desired direction. It becomes possible.

In the above embodiment, when the plurality of high frequency power supplies are a plurality of voltage sources or a plurality of current sources, the adjacent high frequency power supplies have a positional relationship of 1/4 wavelength of the high frequency on the feeder, or a high frequency. It may be connected to the feeder so that the positional relationship is such that the wavelength of 1/4 of the high frequency is added to the positive integral multiple of the wavelength of.

According to this aspect, since the proportional division ratio of each magnetic field generated by each high-frequency power source can be seamlessly changed, the magnetic field can always be generated at all points on the feeding line, and a standing wave can be generated. Can be suppressed more reliably.

In the above embodiment, when the plurality of high frequency power sources are one voltage source and one current source, the voltage source and the current source may be connected to the same position on the feeder line.

According to this aspect, since the proportional division ratio of each magnetic field generated by each high-frequency power source can be seamlessly changed, the magnetic field can always be generated at all points on the feeding line, and a standing wave can be generated. Can be suppressed more reliably.

In the above aspect, the length of the loop-shaped portion of the feeder line may be a positive integer multiple of the wavelength of the high frequency output from the high frequency power supply.

According to this aspect, the phase of the high frequency output from the high frequency power supply and the phase of the high frequency returning around the feeder line can be more reliably matched, and the phase can be seamlessly connected. The generation of standing waves can be suppressed.

In the above aspect, the traveling wave generator may further include at least a control unit that controls the phase of the high frequency output from the high frequency power supply.

According to this aspect, it is possible to integrate and control the phases of high frequencies output from a plurality of high frequency power supplies by a command from the control unit.

In the above aspect, the feeder line may be a parallel two-wire transmission line.

According to this aspect, power can be supplied in a non-contact manner using a parallel two-wire transmission line. By adopting a parallel two-wire transmission line, for example, the feeder line can be easily extended, which is effective when it is necessary to provide the feeder line over a wide range or a long distance.

The power feeding method according to another aspect of the present invention is a power feeding method for supplying power to a power receiving device in a non-contact manner using a feeding line, and is a plurality of power feeding methods connected to a feeding line formed in a loop shape. A step of generating a traveling wave for supplying electric power on a feeder line by using a high frequency power source is included.

According to this aspect, by forming the feeder in a loop shape, it is possible to suppress the generation of a standing wave due to the reflected wave and then generate a traveling wave for power supply in the feeder by a plurality of high-frequency power supplies. Therefore, it is possible to uniformly supply electric power along the feeder line.

According to the present invention, it is possible to provide a power supply system and a power supply method capable of supplying stable power with a simple configuration by using a power supply line.

It is a block diagram which shows typically the structure of the power supply system in 1st Embodiment. It is a figure which showed typically the state of the electric field generated in the feed line when a single voltage source is used as a high frequency power source. It is a figure which showed typically the state of the electric field generated in the feed line when a single current source is used as a high frequency power source. It is a graph for demonstrating the spatial and temporal change of the magnetic field generated by the voltage source of FIG. 2 and the current source of FIG. It is a block diagram which shows typically the structure of the power supply system in 2nd Embodiment. It is a figure which showed typically the traveling wave generated by the two voltage sources of FIG. It is a figure which showed typically the state of the electric field generated in the feed line when the two voltage sources of FIG. 5 are used. It is a figure which showed typically the traveling wave generated by three voltage sources in the modification 3.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a block diagram schematically showing a configuration of a power supply system according to the first embodiment. As shown in the figure, the power feeding system 100 includes a feeding line 1 and a traveling wave generator 2. The traveling wave generator 2 includes a control unit 21, a voltage source 22 and a current source 23, which are high-frequency power supplies. Among the components in the figure, the components excluding the power receiving device 200 constitute the power supply system 100.

The power supply system 100 connects to the power receiving device 200 (connects to the power receiving device) by, for example, transmitting high frequency power of several kHz to several hundred MHz generated by the high frequency power supply to the power receiving device 200 in a non-contact manner via the feeding line 1. Power is supplied to (including load).

Illustratively, the feeder line 1 is laid along a production line such as a factory, and the power receiving device 200 is an automatic guided vehicle (hereinafter referred to as "AGV") that automatically travels by using electromagnetic induction by the feeder line 1. Also called.). The power receiving device 200 includes a coil for receiving power and a capacitor for resonance that generate a voltage by combining with a magnetic field generated in the vicinity of the feeder line 1. As a result, the power receiving device 200 can receive power from the feeder line 1 in a non-contact manner.

The feeder line 1 is, for example, a parallel two-wire transmission line, and is composed of two lead wires. The feeder line 1 is formed in a loop so that a traveling wave is generated. By forming the feeder line 1 in a loop shape, it is possible to avoid the generation of the reflected wave generated at the end portion, so that the generation of the standing wave due to the reflected wave can be suppressed.

The length of the loop-shaped portion of the feeder line 1 is set to a positive integer multiple of the high-frequency wavelength output from the voltage source 22 and the current source 23, which are high-frequency power supplies. As a result, when the high frequency output from the high frequency power supply goes around the feeder line 1 and returns to the same location, the phase of the returned high frequency and the phase of the high frequency output from the high frequency power supply are more reliably matched. It can be made to (synchronize), and high frequencies can be seamlessly connected.

The voltage source 22 and the current source 23 of the traveling wave generator 2 generate a traveling wave on the feeder line 1 for supplying electric power to the power receiving device 200. The voltage source 22 and the current source 23 are connected to the same location P of the loop-shaped feeder line 1. Illustratively, the voltage source 22 can be connected between the two conductors that make up the feeder line 1. On the other hand, the current source 23 can be connected in series with the loop-shaped feeder line 1 by, for example, trans-coupling with an annular ferrite core. With such a configuration, each high frequency output from the voltage source 22 and the current source 23 starts from the connection point P with the loop-shaped feeder line 1 and is in two directions, clockwise and counterclockwise, respectively. proceed.

The control unit 21 of the traveling wave generator 2 controls so that the phases of the high frequencies output from the voltage source 22 and the current source 23 are synchronized with each other. This makes it possible to more reliably suppress the generation of standing waves. When controlling the phases to be synchronized with each other, the control unit 21 may be able to control so as to synchronize with one of the two waves traveling in opposite directions on the feeder line 1. As a result, the phase of the high frequency output from each high frequency power source can be synchronized with one of the two traveling waves in opposite directions, and the traveling wave can be generated in a desired direction.

By configuring the feeding system 100 in this way, it is possible to generate a traveling wave that orbits the loop-shaped feeding line 1. This makes it possible to uniformly supply electric power along the feeder line 1. In the present embodiment, a high frequency that travels on the feeder line 1 by controlling the high frequency generated in both directions of the loop-shaped feeder line 1 by using a plurality of high frequency power supplies is called a traveling wave.

Here, the principle that a traveling wave is generated in the loop-shaped feeder line 1 by connecting the voltage source 22 and the current source 23 to the same location of the feeder line 1 will be described below.

First, FIG. 2 illustrates the state of the electric field generated in the feeder line 1 when a single voltage source 22 is used as the high-frequency power source. In the figure, the darker the color, the greater the electric field strength. Further, in the figure, for convenience of explanation, the length of the feeder line 1 is set to three times the high frequency wavelength. In this case, the high frequency output from the voltage source 22 travels separately from the connection point P with the feeding line 1 to the left and right, and returns to the connection point P again. Since the length of the feeder line 1 is set to an integral multiple of the wavelength of the high frequency, the phase of the high frequency returning to the connection point P and the phase of the high frequency output from the voltage source 22 match. Waves that travel separately from the connection point P to the left and right are seamlessly connected.

That is, the high frequency that rotates clockwise and the high frequency that rotates counterclockwise on the feeder 1 become two opposite waves having the same wavelength, period, and amplitude, and these two opposite waves overlap to determine the feeder line 1. A wave is generated. Due to this standing wave, the electric field at the connection point P of the feeder line 1 and each place separated from the connection point P by a positive integer multiple of 1/2 wavelength is maximized, while the magnetic field at those points is 0. Become.

Next, FIG. 3 illustrates the state of the electric field generated in the feeder line 1 when a single current source 23 is used as the high-frequency power source. Similar to FIG. 2, it shows that the electric field strength increases as the color becomes darker, and the length of the feeder line 1 is set to three times the high frequency wavelength. In this case, the high frequency output from the current source 23 travels separately from the connection point P with the feeder line 1 to the left and right, and returns to the connection point P again. Since the length of the feeder line 1 is set to an integral multiple of the wavelength of the high frequency, the phase of the high frequency returning to the connection point P and the phase of the high frequency output from the current source 23 coincide with each other. Waves that travel separately from the connection point P to the left and right are seamlessly connected.

That is, the high frequency that rotates clockwise and the high frequency that rotates counterclockwise on the feeder 1 become two opposite waves having the same wavelength, period, and amplitude, and these two opposite waves overlap to determine the feeder line 1. A wave is generated. Due to this standing wave, the electric field at the connection point P of the feeder line 1 and each place separated by a positive integer multiple of 1/2 wavelength from the connection point P becomes 0, while the magnetic field at those points becomes maximum. Become.

FIG. 4 illustrates a graph for explaining the spatial and temporal changes in the magnetic field generated by the voltage source 22 of FIG. 2 and the current source 23 of FIG. In the figure, x indicates the distance from the connection point P, and t indicates the time. As shown in the figure, the magnetic field 23H generated by the current source 23 exists at the connection point P, while the magnetic field 22H generated by the voltage source 22 does not exist. The magnetic field 23H and the magnetic field 22H are spatially out of phase by a quarter wavelength in the length direction of the feeder line 1, and temporally out of phase by a quarter period (90 degrees). There is a relationship.

As shown in the figure, when moving from the connection point P, the magnetic fields 22H and 23H generated by the voltage source 22 and the current source 23 fluctuate. The respective magnetic fields 22H and 23H can be represented as magnetic field components represented by the following equations (1) and (2) with respect to H, which is a synthetic magnetic field. H in each equation is a synthetic magnetic field generated by the voltage source 22 and the current source 23, x is the distance from the connection point P, and λ is the high frequency wavelength on the feeder line 1.

Magnetic field 22 by voltage source 22: H × sin (2πx / λ)… (1)
Magnetic field 23 by current source 23: H × cos (2πx / λ)… (2)

Since the magnetic field 22H and the magnetic field 23H are in the relationship of equations (1) and (2), when the voltage source 22 and the current source 23 are connected to the same location of the feeder line 1, the connection location is used. With the movement, the proportional division ratio between the magnetic field 22H and the magnetic field 23H changes seamlessly. As an event at this time, when the voltage source 22 bears the power, a current flows from the voltage source 22 (the current does not flow from the voltage source 22 when there is no load), and when the current source 23 bears the power, the current source A voltage is generated at the output end of the 23 (when there is no load, the power supply line seen from the current source 23 is in a short-circuit state, and no voltage is generated). That is, since the magnetic field is always generated at all the locations on the feeder line 1, only the traveling wave is generated without the standing wave being generated on the feeder line 1.

Here, for example, assuming that the frequency of the high frequency power supply is 13.56 MHz, the wavelength of the high frequency is about 22 m. When a standing wave is generated by this high frequency, the length between the nodes of the standing wave is about 11 m (half the wavelength of the high frequency). That is, when a standing wave is generated on the feeder line 1, a node appears every 11 m, and power cannot be supplied at the place where the node appears. If there are places where power cannot be supplied every 11 m, for example, when power is supplied to a moving body that moves at low speed or stops in the middle, such as AGV, the capacity of the power storage device is increased or when power is transmitted. It becomes necessary to increase the peak power, which causes complicated configuration and high cost.

Therefore, when the power receiving device 200 is mounted on a moving body such as an AGV that moves at a low speed or stops in the middle, the effect obtained by not generating a standing wave on the feeder line 1 is more effective. Increase.

As described above, according to the power supply system 100 in the first embodiment, the power supply line 1 which is formed in a loop and supplies power to the power receiving device 200 in a non-contact manner and a traveling wave for supplying power are provided. A traveling wave generator 2 having a voltage source 22 and a current source 23 for generating on the power supply line 1 is provided, and the voltage source 22 and the current source 23 can be connected to the same location P on the power supply line 1. As a result, a traveling wave traveling in any one direction can be generated for the loop-shaped feeder line 1, and the generation of a standing wave can be suppressed. Therefore, it is possible to uniformly supply electric power along the feeder line 1.

Therefore, according to the power supply system 100 in the first embodiment, it is possible to provide a power supply system capable of supplying stable power with a simple configuration by using the power supply line 1.

[Second Embodiment]
A second embodiment of the present invention will be described. The power supply system 100s in the second embodiment shown in FIG. 5 is different from the power supply system 100 in the first embodiment shown in FIG. 1 described above. In the first embodiment, the voltage source 22 and the current source 23 are used as high frequency power supplies. On the other hand, in the second embodiment, two voltage sources 22a and 22b are used as the high frequency power supply. Other configurations are the same as each configuration of the power supply system in the first embodiment. Therefore, the same reference numerals are given to each component, and the description thereof will be omitted. Hereinafter, the differences from the first embodiment will be mainly described.

As shown in FIG. 5, the traveling wave generator 2s includes a control unit 21s and two voltage sources 22a and 22b which are high-frequency power supplies. The two voltage sources 22a and 22b are the same type of voltage source. The control unit 21s controls so that the voltages output from the two voltage sources 22a and 22b match at a predetermined voltage and the phases of the high frequencies output from the two voltage sources 22a and 22b are synchronized. When the control unit 21s controls the phases to be synchronized with each other, it suffices if the control unit 21s can be controlled so as to synchronize with one of the two waves traveling in opposite directions on the feeder line 1.

Regarding the positional relationship between the connection point Pa of the voltage source 22a and the connection point Pb of the voltage source 22b with respect to the loop-shaped feeder line 1, the distance between the connection point Pa and the connection point Pb is output from the voltage sources 22a and 22b. Set so that the length is 1/4 of the high frequency wavelength. That is, the connection points Pa and Pb are set so that the phase between the high frequency output from the voltage source 22a and the high frequency output from the voltage source 22b is shifted by 90 degrees in time.

By setting the connection points Pa and Pb in this way, the traveling wave W as illustrated in FIG. 6 can be generated. In the figure, for convenience of explanation, the length of the feeder line 1 is set to 6 times the high frequency wavelength. Vpa indicates the voltage at the connection point Pa of the voltage source 22a, and Vpb indicates the voltage at the connection point Pb of the voltage source 22b. As shown in the figure, the output voltage Vpa of the voltage source 22a and the output voltage Vpb of the voltage source 22b are output from the connection points Pa and Pb set at intervals of 1/4 wavelength of the traveling wave W, respectively. ing. In addition, the phases of the waveforms due to the respective output voltages Vpa and Vpb are output so as to be synchronized.

Here, FIG. 6 shows the traveling wave W at a certain time point, and the traveling wave W does not stop with the waveform shown in the figure. The traveling wave W always travels on the feeder line 1 in the counterclockwise direction shown in the figure, for example. The traveling direction of the traveling wave W may be clockwise in the figure.

FIG. 7 is a diagram illustrating the state of the electric field generated in the feeder line 1 when two voltage sources 22a and 22b are used as the high-frequency power source. In the figure, the darker the color, the greater the electric field strength. Further, in the figure, for convenience of explanation, the length of the feeder line 1 is set to 8 times the high frequency wavelength. In this case, the magnetic field generated by the voltage source 22a and the magnetic field generated by the voltage source 22b are spatially deviated by 1/4 wavelength in the length direction of the feeder line 1, and are 1/4 in time. The phases are out of phase for four cycles (90 degrees). That is, the relationship is similar to the relationship between the magnetic field 22H and the magnetic field 23H shown in FIG. 4 described above.

Therefore, for example, when moving from the connection point Pa, the proportional division ratio of each magnetic field generated by the voltage sources 22a and 22b changes seamlessly. As an event at this time, at least one of the voltage sources 22a and 22b, or both voltage sources 22a and 22b bear the electric power according to the proportional division ratio, and a current for generating a traveling wave flows through the feeder line 1. It will be. That is, since the magnetic field is always generated at all the locations on the feeder line 1, only the traveling wave is generated without the standing wave being generated on the feeder line 1.

As described above, according to the feeding system 100s of the second embodiment, the feeding line 1 which is formed in a loop shape and supplies power to the power receiving device 200 in a non-contact manner and a traveling wave for supplying power are provided. A traveling wave generator 2s having two voltage sources 22a and 22b generated on the feeder line 1 is provided, and the two voltage sources 22a and 22b are spaced by a high frequency 1/4 wavelength on the feeder line 1. It can be connected to the feeder line 1 so as to have a positional relationship. As a result, a traveling wave traveling in any one direction can be generated for the loop-shaped feeder line 1, and the generation of a standing wave can be suppressed. Therefore, it is possible to uniformly supply electric power along the feeder line 1.

Therefore, according to the power supply system 100s of the second embodiment, it is possible to provide a power supply system capable of supplying stable power with a simple configuration by using the power supply line 1.

[Modification example]
Each of the embodiments described above is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. Each element included in each embodiment and its arrangement, material, condition, shape, size, etc. are not limited to those exemplified, and can be changed as appropriate. In addition, the configurations shown in different embodiments can be partially replaced or combined.

(Modification example 1)
For example, in the second embodiment described above, the distance between the connection point Pa of the voltage source 22a and the connection point Pb of the voltage source 22b is set to 1/4 of the high frequency wavelength output from the voltage sources 22a and 22b. The length is set to be, but it is not limited to this. For example, the distance between the connection point Pa and the connection point Pb may be a length obtained by adding 1/4 wavelength of the same high frequency to a positive integer multiple of the wavelength of the high frequency output from the voltage sources 22a and 22b. ..

(Modification 2)
Further, in the second embodiment described above, the case where two voltage sources 22a and 22b are used as the high frequency power source has been described, but the present invention is not limited to this. For example, three or more voltage sources may be used. In this case, the adjacent voltage sources are located on the feeder line 1 at intervals of 1/4 wavelength of the high frequency output from each voltage source, or a positive integer of the high frequency wavelength output from each voltage source. It may be connected to the feeder line 1 so as to have a positional relationship that is spaced by a length corresponding to the addition of 1/4 wavelength of the same high frequency.

(Modification 3)
Further, when setting the distance between the connection points in the second embodiment and the first and second modifications described above, the high frequency 1/4 wavelength is used, but it does not necessarily have to be the 1/4 wavelength. It suffices if the phases of the high frequencies output from each voltage source can be controlled to be synchronized in consideration of the phase shift caused by arranging the plurality of voltage sources in a dispersed manner and arranging them at different positions.

For example, as illustrated in FIG. 8, a high frequency 1/3 wavelength (120 degrees) may be used. In the figure, the adjacent voltage sources are spaced by the length of the feeder line 1 by adding 1/3 wavelength of the same high frequency to a positive integral multiple of the wavelength of the high frequency output from each voltage source. It is connected to the feeder line 1 so as to have a positional relationship.

Specifically, the distance between the adjacent connection point Pc and the connection point Pd is the length obtained by adding 1/3 wavelength of the high frequency to twice the wavelength of the high frequency, and the adjacent connection point Pd and the connection point Pe. The distance between and is the length obtained by adding 1/3 of the high frequency wavelength to the high frequency wavelength, and the distance between the adjacent connection point Pe and the connection point Pc is twice as high as the high frequency wavelength. It is the length with 1/3 wavelength added.

(Modification example 4)
Further, in the above-described second embodiment and each modification, the case where two voltage sources 22a, 22b, or three or more voltage sources are used as the high frequency power source has been described, but the present invention is not limited thereto. For example, a current source may be used instead of the voltage source. That is, two current sources or three or more current sources may be used in the same manner as when the voltage source described above is used.

1 ... Feed line, 2, 2s ... Traveling wave generator, 21,21s ... Control unit, 22, 22a, 22b ... Voltage source, 23 ... Current source, 100, 100s ... Power supply system, 200 ... Power receiving device

Claims (8)

A feeder that is formed in a loop and supplies power to the power receiving device in a non-contact manner.
A traveling wave generator having a plurality of voltage sources or a plurality of current sources, which is a plurality of high-frequency power sources that generate a traveling wave for supplying the power to the feeder line.
Equipped with a,
The length of the loop-shaped portion of the feeder is a positive integer multiple of the wavelength of the high frequency output from the high frequency power supply.
The length of the adjacent high-frequency power supply on the feeder line with a positional relationship of 1/4 wavelength of the high frequency, or a positive integral multiple of the wavelength of the high frequency plus 1/4 wavelength of the high frequency. It is connected to the feeder so that it has a positional relationship with a minute interval.
Power supply system. A feeder that is formed in a loop and supplies power to the power receiving device in a non-contact manner.
A traveling wave generator having one voltage source and one current source, which are a plurality of high-frequency power sources that generate a traveling wave for supplying the electric power to the feeder line.
With
The length of the loop-shaped portion of the feeder is a positive integer multiple of the wavelength of the high frequency output from the high frequency power supply.
The voltage source and the current source are connected to the same location on the feeder.
Power supply system. The positions of the plurality of high-frequency power supplies are determined so that the phases of the high frequencies output from the respective high-frequency power supplies are synchronized.
The power supply system according to claim 1 or 2 . The positions of the plurality of high frequency power supplies are set so that the phase of the high frequency output from each high frequency power supply is synchronized with one of two waves traveling in opposite directions on the feeder line.
The power supply system according to claim 3 . The traveling wave generator further includes at least a control unit that controls the phase of the high frequency output from the high frequency power supply.
The power supply system according to any one of claims 1 to 4 . The feeder is a parallel two-wire transmission line.
The power supply system according to any one of claims 1 to 5 . It is a power supply method that supplies power to a power receiving device in a non-contact manner using a power supply line.
Using a plurality of voltage sources or a plurality of current sources, which are a plurality of high-frequency power supplies connected to the feeder line formed in a loop shape, a traveling wave for supplying the power is generated in the feeder line. Including the process ,
The length of the loop-shaped portion of the feeder is a positive integer multiple of the wavelength of the high frequency output from the high frequency power supply.
The length of the adjacent high-frequency power supply on the feeder line with a positional relationship of 1/4 wavelength of the high frequency, or a positive integral multiple of the wavelength of the high frequency plus 1/4 wavelength of the high frequency. It is connected to the feeder so that it has a positional relationship with a minute interval.
Power supply method. It is a power supply method that supplies power to a power receiving device in a non-contact manner using a feeding line.
Using one voltage source and one current source, which are a plurality of high-frequency power supplies connected to the feeder line formed in a loop shape, a traveling wave for supplying the power is generated in the feeder line. Including the process,
The length of the loop-shaped portion of the feeder is a positive integer multiple of the wavelength of the high frequency output from the high frequency power supply.
The voltage source and the current source are connected to the same location on the feeder.
Power supply method.