WO2012029179A1 - 無線送電装置 - Google Patents
無線送電装置 Download PDFInfo
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- WO2012029179A1 WO2012029179A1 PCT/JP2010/065167 JP2010065167W WO2012029179A1 WO 2012029179 A1 WO2012029179 A1 WO 2012029179A1 JP 2010065167 W JP2010065167 W JP 2010065167W WO 2012029179 A1 WO2012029179 A1 WO 2012029179A1
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- coil
- power transmission
- electromagnetic wave
- power
- transmission device
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 159
- 238000009826 distribution Methods 0.000 claims abstract description 65
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 12
- 239000006185 dispersion Substances 0.000 description 9
- 230000005674 electromagnetic induction Effects 0.000 description 8
- 230000002411 adverse Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/346—Preventing or reducing leakage fields
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
- H04B5/26—Inductive coupling using coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
Definitions
- the present invention relates to a power transmission device.
- wireless power transmission technology an electromagnetic wave is radiated from a coil inside the power transmission device toward a coil inside the power reception device, and electric power is wirelessly transmitted via the radiated electromagnetic wave.
- a power transmission device is provided with a mechanism for fixing the arrangement of the power reception device (cradle mechanism), and the power reception device is disposed to perform wireless power transmission.
- leakage electromagnetic waves electromagnetic waves leaking into the space
- an electromagnetic wave having a certain intensity or more adversely affects the human body.
- a technique is known in which a leakage magnetic flux detection coil is provided on the power receiving device side, the detection result is fed back to the power transmission device side, and the leakage magnetic flux is reduced on the power transmission device side.
- the electromagnetic wave having a strength that adversely affects the human body is not absorbed by the human body.
- the conventional technology described above has a problem that the influence of electromagnetic waves on the surroundings cannot be sufficiently suppressed. Specifically, in the conventional technique for adjusting the position of the power receiving device, if the power receiving device is slightly deviated from the marking position, the leakage electromagnetic wave becomes larger than the reference value, which affects the surrounding electronic equipment or the human body. There is a risk of affecting.
- the disclosed technology has been made to solve the above-described problems of the prior art, and an object thereof is to provide a power transmission device that can sufficiently suppress the influence of electromagnetic waves on the surroundings.
- the power transmission device disclosed in the present application includes a first coil that radiates a first electromagnetic wave toward an external coil.
- the power transmission device is arranged at a position where the central axis of the first coil and the central axis of the first coil are different from each other, and are arranged close to the first coil, so that the intensity distribution has a polarity opposite to that of the first electromagnetic wave.
- a second coil that emits a second electromagnetic wave is provided.
- FIG. 1 is a diagram illustrating an overview configuration of a power transmission / reception system including a power transmission device according to a first embodiment.
- FIG. 2 is a plan view of the power transmission coil viewed from the power reception coil side.
- FIG. 3 is a plan view of the power receiving coil viewed from the power transmitting coil side.
- FIG. 4 is a diagram for explaining an example (part 1) of change in the electromagnetic wave intensity distribution caused by the arrangement of the correction coil.
- FIG. 5 is an enlarged view of a portion P in FIG.
- FIG. 6 is a diagram for explaining an example (part 2) of the change in the electromagnetic wave intensity distribution caused by the arrangement of the correction coil.
- FIG. 7 is an enlarged view of a portion Q in FIG. FIG.
- FIG. 8 is a diagram for explaining an example (part 3) of the change in the electromagnetic wave intensity distribution caused by the arrangement of the correction coil.
- FIG. 9 is an enlarged view of a portion R in FIG.
- FIG. 10 is a plan view showing a first arrangement example of the correction coil.
- FIG. 11 is a side view of FIG.
- FIG. 12 is a plan view showing a second arrangement example of the correction coil.
- FIG. 13 is a side view of FIG.
- FIG. 14 is a diagram illustrating an overview configuration of a power transmission / reception system including a power transmission device according to the second embodiment.
- FIG. 15 is a diagram for explaining an example of a change in the electromagnetic wave intensity distribution caused by the arrangement of the correction coil.
- FIG. 16 is an enlarged view of a portion S in FIG.
- FIG. 17 is a plan view showing a first example of the arrangement of the correction coil.
- FIG. 18 is a plan view showing a second arrangement example of the correction coil.
- FIG. 1 is a diagram illustrating an overview configuration of a power transmission / reception system including a power transmission device according to a first embodiment.
- the power transmission / reception system 1 illustrated in FIG. 1 includes a power transmission device 3 and a power reception device 5.
- power is transmitted as electromagnetic energy from the power transmission device 3 to the power reception device 5.
- electromagnetic energy is sometimes referred to as “electromagnetic wave”.
- the power transmission device 3 includes therein an oscillator 31, a power source 32, a power transmission coil 33, power sources 34-1 to 34-n, correction coils 35-1 to 35-n, and a phase adjustment circuit 36.
- the power receiving device 5 includes a power receiving coil 51 and a load circuit 52 therein.
- the oscillator 31 oscillates a signal of a predetermined frequency, and inputs the oscillated frequency signal to the power supply 32 and the power supplies 34-1 to 34-n.
- the power supply 32 outputs an alternating current having a frequency corresponding to the frequency signal input from the oscillator 31 to the power transmission coil 33.
- the power supplies 34-1 to 34-n output alternating currents having frequencies corresponding to the frequency signals input from the oscillator 31 to the correction coils 35-1 to 35-n, respectively.
- the power transmission coil 33 is a coil that radiates electromagnetic waves toward the power reception coil 51.
- a configuration example of the power transmission coil 33 is shown in FIG. FIG. 2 is a plan view of the power transmission coil 33 viewed from the power reception coil 51 side.
- the power transmission coil 33 includes a magnetic field resonance coil 33a and a power supply coil 33b.
- the magnetic field resonance coil 33a is an LC resonance circuit and functions as a magnetic field resonance coil that generates magnetic field resonance with the magnetic field resonance coil 51a described later of the power receiving coil 51.
- the capacitor component of the LC resonance circuit may be realized by an element, or may be realized by a stray capacitance with both ends of the coil being opened.
- the power supply coil 33b is a power transmission / reception unit that is connected to the power supply 32 and supplies the power obtained from the power supply 32 to the magnetic resonance coil 33a by electromagnetic induction.
- the arrangement of the power supply coil 33b and the magnetic field resonance coil 33a is a distance and an arrangement that can generate electromagnetic induction.
- the power receiving coil 51 is a coil that receives an electromagnetic wave radiated from the power transmitting coil 33.
- a configuration example of the power receiving coil 51 is shown in FIG. FIG. 3 is a plan view of the power reception coil 51 as viewed from the power transmission coil 33 side.
- the power receiving coil 51 includes a magnetic field resonance coil 51a and a power extraction coil 51b.
- the magnetic field resonance coil 51a is an LC resonance circuit and functions as a magnetic field resonance coil that generates magnetic field resonance with the magnetic field resonance coil 33a.
- the capacitor component of the LC resonance circuit may be realized by an element, or may be realized by a stray capacitance with both ends of the coil being opened.
- the power extraction coil 51b is disposed at a position where electromagnetic induction occurs between the magnetic field resonance coil 51a.
- the power extraction coil 51b is electrically connected to the load circuit 52, and the energy transferred to the power extraction coil 51b by electromagnetic induction is provided to the load circuit 52 as electric power.
- the load circuit 52 any circuit can be used, for example, a battery.
- the power of the power supply 32 is radiated from the power transmission coil 33 to the power reception coil 51 as an electromagnetic wave and is finally supplied to the load circuit 52.
- Electromagnetic waves leaking into the space may adversely affect surrounding electronic devices and human bodies.
- the detection result is fed back to the power transmission device side, and the leakage magnetic flux is reduced on the power transmission device side, application to the coil is detected after detecting an increase in the strength of the magnetic flux.
- Leakage electromagnetic waves are generated during the period until the voltage adjustment is completed, which may affect surrounding electronic devices and human bodies.
- the power transmission device 3 reduces the leakage electromagnetic waves by arranging the correction coils 35-1 to 35-n in the power transmission coil 33 at predetermined positions.
- the description of the correction coils 35-1 to 35-n will be continued.
- the correction coils 35-1 to 35-n are simply referred to as “correction coils 35”.
- the correction coil 35 is disposed on the power transmission coil 33 so that the central axis of the power transmission coil 33 and its own central axis do not overlap.
- the correction coil 35 is an electromagnetic wave radiated from the power transmission coil 33 toward the power receiving coil 51 (hereinafter referred to as “first electromagnetic wave”) based on the current input from the power sources 34-1 to 34-n.
- first electromagnetic wave an electromagnetic wave radiated from the power transmission coil 33 toward the power receiving coil 51
- second electromagnetic wave having an intensity distribution of opposite polarity.
- FIG. 4 is a view for explaining an example (No. 1) of change in the electromagnetic wave intensity distribution caused by the arrangement of the correction coil 35.
- the horizontal axis in FIG. 4 indicates the distance from the central axis “0” of the power transmission coil 33, and the vertical axis in FIG. 4 indicates the electromagnetic wave intensity. Further, the horizontal axis shows the value after normalization with the radius of the power transmission coil 33 as 1. In this embodiment, the radius of the power transmission coil 33 is 25 mm. In the present embodiment, the radius of the correction coil 35 is assumed to be 25 mm, but it is not necessary to have the same diameter as the power transmission coil 33.
- the electromagnetic wave intensity indicates the magnetic field intensity. This is because the direction in which wireless power feeding is performed on the power receiving device is the direction that penetrates the power transmission coil 33, but the magnetic field strength is dominant in this direction, and the electric field strength can be ignored.
- FIG. 5 is an enlarged view of a portion P in FIG.
- the intensity distribution 101 of the first electromagnetic wave radiated from the power transmission coil 33 has a peak value at the central axis “0” of the power transmission coil 33 and is away from the central axis “0” of the power transmission coil 33.
- the correction coil 35 corresponds to ⁇ 1 ⁇ ⁇ from the central axis “0” of the power transmission coil 33 so that the central axis “0” of the power transmission coil 33 and the central axis of the correction coil 35 do not overlap. Place it at a distance.
- the arrangement position of the correction coil 35 is not limited to the position where the correction coil 35 is separated from the central axis “0” of the power transmission coil 33 by a distance corresponding to ⁇ 1 ⁇ ⁇ . It is sufficient that the central axis “0” of the power transmission coil 33 and the central axis of the correction coil 35 are in positions that do not overlap each other.
- the correction coil 35 radiates the second electromagnetic wave having intensity distributions 102 and 103 having opposite polarities with respect to the intensity distribution 101 of the first electromagnetic wave.
- the correction coil 35 radiates the intensity distribution of the reverse polarity, so that a part of the first electromagnetic wave is canceled by the second electromagnetic wave, and as shown in FIG.
- a range exceeding a predetermined reference value in the distance direction from the central axis of the power transmission coil 33 is reduced as compared with the intensity distribution 101 of the first electromagnetic wave. . That is, the power transmission device 3 can reduce the leaked electromagnetic wave exceeding the predetermined reference value by an amount corresponding to the intensity distribution 101, the curve 104, and the region 105 sandwiched between the reference values.
- the correction coil 35 if there is no power receiving device serving as an electromagnetic wave shield in the range from ⁇ 2 to 2 in the distance direction from the central axis of the power transmission coil 33, the reference is performed by wireless power transmission. An electromagnetic wave exceeding the value is radiated to the space.
- the correction coil 35 is provided, as shown in FIG. 5, if there is a power receiving device in the range from ⁇ 1.5 to 1.5 in the distance direction from the central axis of the power transmission coil 33, the reference value is exceeded. Electromagnetic waves are no longer emitted into space. Therefore, even if wireless power feeding is performed in a state where no power receiving device exists between ⁇ 2 to ⁇ 1.5 or 1.5 to 2, leaked electromagnetic waves exceeding the reference value are not radiated.
- wireless power feeding can be performed in a state where there is no power receiving device between 0.5 mm and 6 mm on the horizontal axis.
- FIG. 6 is a diagram for explaining an example (part 2) of change in the electromagnetic wave intensity distribution caused by the arrangement of the correction coil 35.
- FIG. 7 is an enlarged view of a portion Q in FIG.
- Reference numeral 204 in FIG. 6 represents a normalized distribution so that the maximum value of the electromagnetic wave intensity is “1”.
- the output of the power transmission coil is the same, the output of the correction coil is adjusted as appropriate so that the expected combined electromagnetic wave intensity can be obtained. Further, the output (voltage, current) to each coil has the same value as in FIG.
- the correction coil 35 corresponds to ⁇ 1 ⁇ ⁇ from the central axis “0” of the power transmission coil 33 so that the central axis “0” of the power transmission coil 33 and the central axis of the correction coil 35 do not overlap. Place it at a distance.
- the correction coil 35 emits the second electromagnetic wave having intensity distributions 202 and 203 having opposite polarities with respect to the intensity distribution 201 of the first electromagnetic wave.
- a part of the first electromagnetic wave is canceled by the second electromagnetic wave, and the width of the intensity distribution 201 of the first electromagnetic wave is reduced to the width of the curve 204 as shown in FIG.
- the power transmission apparatus 3 can reduce the leakage electromagnetic wave exceeding a predetermined reference value by an amount corresponding to the intensity distribution 201, the curve 204, and the region 205 sandwiched between the reference values.
- FIG. 8 is a diagram for explaining a change example (No. 3) of the electromagnetic wave intensity distribution caused by the arrangement of the correction coil 35.
- FIG. 9 is an enlarged view of a portion R in FIG.
- FIG. 8 shows an example in which the dispersion value ⁇ 2 of the second electromagnetic wave intensity distribution is changed to 2 when the dispersion value ⁇ 2 of the intensity distribution of the second electromagnetic wave in FIG.
- Reference numeral 304 in FIG. 8 represents a distribution that is normalized so that the maximum value of the electromagnetic wave intensity is “1”.
- the output of the power transmission coil is the same, the output of the correction coil is adjusted as appropriate so that the expected combined electromagnetic wave intensity can be obtained. Further, the output (voltage, current) to each coil has the same value as in the case of FIGS.
- the correction coil 35 corresponds to ⁇ 1 ⁇ ⁇ from the central axis “0” of the power transmission coil 33 so that the central axis “0” of the power transmission coil 33 and the central axis of the correction coil 35 do not overlap. Place it at a distance.
- the arrangement position of the correction coil 35 is not limited to the position where the correction coil 35 is separated from the central axis “0” of the power transmission coil 33 by a distance corresponding to ⁇ 1 ⁇ ⁇ . It is sufficient that the central axis “0” of the power transmission coil 33 and the central axis of the correction coil 35 are in positions that do not overlap each other.
- the correction coil 35 radiates second electromagnetic waves having intensity distributions 302 and 303 having opposite polarities to the first electromagnetic wave intensity distribution 301.
- the correction coil 35 radiates the intensity distribution having the reverse polarity, so that a part of the first electromagnetic wave is canceled by the second electromagnetic wave, and as shown in FIG.
- the power transmission device 3 can reduce the leakage electromagnetic wave exceeding a predetermined reference value by an amount corresponding to the region 305 smaller than the region 105 in FIG.
- the phase adjustment circuit 36 adjusts the current flowing through the power transmission coil 33 and the current flowing through the correction coil 35 so that they are in opposite phases. Specifically, the phase adjustment circuit 36 inverts the phase of the alternating current output from the power sources 34-1 to 34-n by 180 ° with respect to the phase of the alternating current output from the power source 32, so that these 2 The two alternating currents are adjusted so as to have opposite phases. The currents from the power sources 34-1 to 34-n inverted by 180 ° are provided to the correction coils 35-1 to 35-n, respectively. The correction coils 35-1 to 35-n are based on the provided currents. The second electromagnetic wave having an intensity distribution opposite in polarity to the first electromagnetic wave is emitted. Even if the 180 ° phase is not different, the phase of the current flowing through the correction coil may be a phase that creates an electromagnetic wave that weakens the electromagnetic wave generated by the power transmission coil. *
- the correction coil 35 is arranged in the power transmission coil 33 so that the central axis of the power transmission coil 33 and its central axis do not overlap.
- FIG. 10 is a plan view showing an arrangement example 1 of the correction coil 35.
- FIG. 11 is a side view of FIG.
- the two correction coils 35 are arranged close to the power transmission coil 33 so that the peripheral edge of the power transmission coil 33 and its own central axis overlap.
- the two correction coils 35 radiate a second electromagnetic wave having an intensity distribution opposite in polarity to the first electromagnetic wave radiated from the power transmission coil 33.
- two parts located in the vicinity of the overlapping part of the periphery of the power transmission coil 33 and the center axis of the two correction coils 35 in the first electromagnetic wave are canceled by the second electromagnetic wave.
- FIG. 12 is a plan view showing an arrangement example 2 of the correction coil 35.
- FIG. 13 is a side view of FIG.
- the four correction coils 35 are arranged close to the power transmission coil 33 so that the peripheral edge of the power transmission coil 33 and the central axis of the four correction coils 35 overlap each other.
- the four correction coils 35 radiate the second electromagnetic wave having an intensity distribution opposite to the first electromagnetic wave radiated from the power transmission coil 33. Thereby, among the first electromagnetic wave, in particular, the four portions located near the overlapping portion of the periphery of the power transmission coil 33 and the central axis of the four correction coils 35 are canceled by the second electromagnetic wave.
- the power transmission device 3 includes the power transmission coil 33 that radiates the first electromagnetic wave toward the power reception coil 51 of the power reception device 5, and the second intensity distribution having a polarity opposite to that of the first electromagnetic wave.
- the correction coils 35 that radiate the electromagnetic waves are arranged close to each other with their center axes shifted. For this reason, according to Example 1, since a part of 1st electromagnetic wave can be canceled by the 2nd electromagnetic wave, a leakage electromagnetic wave can be reduced. As a result, the influence of electromagnetic waves on surrounding electronic devices and human bodies can be reduced.
- the phase adjustment circuit 36 adjusts the current flowing through the power transmission coil 33 and the current flowing through the correction coil 35 so that the phases are opposite to each other. A second electromagnetic wave is emitted based on the subsequent current. For this reason, according to Example 1, the 2nd electromagnetic wave used as intensity distribution of a reverse polarity with respect to a 1st electromagnetic wave can be produced
- the correction coil 35 is disposed close to the power transmission coil 33 so that the peripheral edge of the power transmission coil 33 and its own central axis overlap. For this reason, according to the first embodiment, a portion of the first electromagnetic wave located in the vicinity of the overlapping portion between the periphery of the power transmission coil 33 and the central axis of the correction coil 35 can be canceled by the second electromagnetic wave.
- the current flowing through the power transmission coil 33 and the current flowing through the correction coil 35 are adjusted so as to have opposite phases, thereby generating a second electromagnetic wave having an intensity distribution opposite to that of the first electromagnetic wave.
- the method of generating the second electromagnetic wave is not limited to this.
- the power transmission coil 33 and the correction coil 35 can be reversely wound to generate a second electromagnetic wave.
- the phase adjustment circuit 36 shown in FIG. 1 is omitted.
- the second electromagnetic wave can be generated by separately providing an adjusting means for adjusting the direction of the current so that the direction of the current flowing through the power transmission coil 33 and the direction of the current flowing through the correction coil 35 are different from each other.
- FIG. 14 is a diagram illustrating an overview configuration of a power transmission / reception system including the power transmission device according to the second embodiment.
- the power transmission / reception system 2 illustrated in FIG. 14 includes a power transmission device 3 a and a power reception device 5.
- each of the power transmission coils 43-1 to 43-n has the same configuration as that of the power transmission coil 33.
- the power transmission coils 43-1 to 43-n are simply referred to as “power transmission coil 43”.
- the correction coil 35 is disposed close to the outer coil so that the outer peripheral edge of the plurality of power transmission coils 43 and the center axis of the outer coil overlap each other.
- the correction coil 35 receives current from the power sources 34-1 to 34-n, the correction coil 35 has a second intensity distribution having a polarity opposite to that of the first electromagnetic wave radiated from the power transmission coil 43 toward the power reception coil 51. Radiates electromagnetic waves.
- FIG. 15 is a diagram for explaining an example of a change in the electromagnetic wave intensity distribution caused by the arrangement of the correction coil 35.
- the horizontal axis in FIG. 15 indicates the distances from the central axes “0”, “ ⁇ 2”, and “ ⁇ 4” of the five power transmission coils 43, and the vertical axis in FIG. 15 indicates the electromagnetic wave intensity. Further, the horizontal axis shows the value after normalization with the radius of the power transmission coil 33 as 1. In the present embodiment, the radius of the correction coil 35 is assumed to be 25 mm, but it is not necessary to have the same diameter as the power transmission coil 33.
- the electromagnetic wave intensity indicates the magnetic field intensity. This is because the direction in which wireless power feeding is performed on the power receiving device is the direction that penetrates the power transmission coil 33, but the magnetic field strength is dominant in this direction, and the electric field strength can be ignored.
- FIG. 16 is an enlarged view of a portion S in FIG.
- the first electromagnetic wave intensity distribution 401 obtained by combining the electromagnetic wave intensity distributions 401 a to 401 e radiated from the five power transmission coils 43 is symmetric with respect to the central axis “0” of the central power transmission coil 43. It becomes a trapezoidal distribution.
- the correction coil 35 is moved from the center axis “ ⁇ 4” of the outer coil such that the outer peripheral edge of the five power transmission coils 43 overlaps with the center axis of the correction coil 35. They are arranged at positions separated by a distance corresponding to ⁇ 1 ⁇ ⁇ .
- the arrangement position of the correction coil 35 is not limited to the position where the correction coil 35 is separated from the central axis “ ⁇ 4” of the power transmission coil 33 by a distance corresponding to ⁇ 1 ⁇ ⁇ . It is sufficient that the central axis “ ⁇ ” of the power transmission coil 33 and the central axis of the correction coil 35 are positions where they do not overlap each other.
- the correction coil 35 radiates second electromagnetic waves having intensity distributions 402 and 403 having opposite polarities to the first electromagnetic wave intensity distribution 401. It is assumed that the intensity distributions 401a to 401e of the electromagnetic waves emitted from the power transmission coil 43 and the intensity distributions 402 and 403 of the second electromagnetic waves emitted from the correction coil 35 have the same Gaussian distribution.
- the correction coil 35 radiates the intensity distribution having the opposite polarity, a part of the first electromagnetic wave is canceled by the second electromagnetic wave, and as shown in FIG.
- the range exceeding a predetermined reference value in the distance direction from the central axis of the power transmission coil 33 is reduced as compared with the first electromagnetic wave intensity distribution 401. . That is, the power transmission device 3a can reduce the leakage electromagnetic wave exceeding the predetermined reference value by an amount corresponding to the region 405.
- the correction coil 35 is disposed close to the outer coil such that the outer peripheral edge of the outermost coil among the plurality of power transmission coils 43 overlaps with the central axis thereof.
- FIG. 17 is a plan view showing an arrangement example 1 of the correction coil 35.
- the four correction coils 35 are arranged so that the peripheral edges of the power transmission coils 43 a to 43 d located on the outermost side among the nine power transmission coils 43 arranged in a cross shape overlap with the central axis of the four correction coils 35.
- the power transmission coils 43a to 43d are arranged close to each other.
- the four correction coils 35 radiate the second electromagnetic wave having an intensity distribution opposite in polarity to the first electromagnetic wave radiated from the power transmission coil 43.
- the portion of the first electromagnetic wave that is located near the overlapping portion between the periphery of the power transmission coils 43a and 43b and the central axis of the correction coil 35 is canceled by the second electromagnetic wave.
- FIG. 18 is a plan view showing an arrangement example 2 of the correction coil 35.
- twelve correction coils 35 are arranged close to the power transmission coil 43 so that the peripheral edges of the five power transmission coils 43 arranged in a single letter shape overlap with the center axis of the twelve correction coils 35.
- all of the five power transmission coils 43 arranged in a single character are located on the outermost side, so all of the five power transmission coils 43 correspond to the outer coils.
- the twelve correction coils 35 radiate the second electromagnetic wave having an intensity distribution opposite in polarity to the first electromagnetic wave radiated from the power transmission coil 43. Thereby, the part located in the vicinity of the overlapping part of the periphery of the power transmission coil 43 and the center axis of the correction coil 35 in the first electromagnetic wave is canceled by the second electromagnetic wave.
- the power transmission device 3a according to the second embodiment is disposed close to the outer coil such that the outer periphery of the outermost coil among the plurality of power transmission coils 43 and the center axis thereof overlap. Yes.
- a portion of the first electromagnetic wave located in the vicinity of the overlapping portion between the peripheral edge of the outer coil and the central axis of the correction coil 35 can be canceled by the second electromagnetic wave.
- the influence of electromagnetic waves on surrounding electronic devices and human bodies can be reduced.
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Abstract
Description
3、3a 送電装置
5 受電装置
31 発振器
32 電源
33、43 送電コイル
34 電源
35 補正コイル
36 位相調整回路
51 受電コイル
52 負荷回路
Claims (7)
- 受電装置へ無線で電力を送電する送電装置であって、
第一の電磁波を放射する第一のコイルと、
前記第一のコイルの中心軸と自身の中心軸とが互いに異なる位置に配置されるとともに、前記第一の電磁波と逆極性の強度分布となる第二の電磁波を放射する第二のコイルと
を有することを特徴とする送電装置。 - 前記送電装置は、さらに、
前記第一のコイルおよび前記第二のコイルに電力を供給する少なくとも一つの電源部と
前記第二のコイルに出力する電流の位相と前記第一のコイルに出力する電流の位相とに、該第一のコイルが放射する電磁波と、該第二のコイルが放射する電磁波とが逆極性となる位相差を発生させる位相調整回路とを有し、
前記電源装置と前記位相調整回路とが接続されていることを特徴とする請求項1記載の送電装置。 - 前記位相調整回路は、180度の前記位相差を発生させることを特徴とする請求項2記載の送電装置。
- 前記第一のコイルおよび前記第二のコイルに電力を供給する少なくとも一つの電源部を有し、
前記第一のコイルに流れる電流の向きと、前記第二のコイルに流れる電流の向きとが異なることを特徴とする請求項1記載の送電装置。 - 前記第一のコイル及び前記第二のコイルは、互いに逆巻きであることを特徴とする請求項1記載の送電装置。
- 前記第二のコイルは、前記第一のコイルの周縁と自身の中心軸とが重複する位置に配置されることを特徴とする請求項1乃至請求項5のいずれか一つに記載の送電装置。
- 複数の前記第一のコイルを備え、
前記第二のコイルは、複数の前記第一のコイルのうち最も外側に位置する前記第一のコイルである外側コイルの周縁と自身の中心軸とが重複する位置に配置されることを特徴とする請求項1記載の送電装置。
Priority Applications (6)
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PCT/JP2010/065167 WO2012029179A1 (ja) | 2010-09-03 | 2010-09-03 | 無線送電装置 |
JP2012531645A JP5488698B2 (ja) | 2010-09-03 | 2010-09-03 | 無線送電装置 |
CN201080068800.7A CN103081293B (zh) | 2010-09-03 | 2010-09-03 | 无线送电装置 |
EP10856728.0A EP2613424B1 (en) | 2010-09-03 | 2010-09-03 | Wireless power transmission device |
KR1020137005046A KR20130041987A (ko) | 2010-09-03 | 2010-09-03 | 송전 장치 |
US13/763,901 US20130147283A1 (en) | 2010-09-03 | 2013-02-11 | Power transmission device |
Applications Claiming Priority (1)
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PCT/JP2010/065167 WO2012029179A1 (ja) | 2010-09-03 | 2010-09-03 | 無線送電装置 |
Related Child Applications (1)
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US13/763,901 Continuation US20130147283A1 (en) | 2010-09-03 | 2013-02-11 | Power transmission device |
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WO2012029179A1 true WO2012029179A1 (ja) | 2012-03-08 |
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PCT/JP2010/065167 WO2012029179A1 (ja) | 2010-09-03 | 2010-09-03 | 無線送電装置 |
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US (1) | US20130147283A1 (ja) |
EP (1) | EP2613424B1 (ja) |
JP (1) | JP5488698B2 (ja) |
KR (1) | KR20130041987A (ja) |
CN (1) | CN103081293B (ja) |
WO (1) | WO2012029179A1 (ja) |
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JP2014507925A (ja) * | 2011-01-28 | 2014-03-27 | サムスン エレクトロニクス カンパニー リミテッド | 均一な磁場を有するソース共振器を含む無線電力送信装置及びその方法 |
JP2014072968A (ja) * | 2012-09-28 | 2014-04-21 | Tdk Corp | ワイヤレス電力伝送装置 |
KR101413490B1 (ko) * | 2012-07-24 | 2014-07-01 | (주)기술과가치 | 무선전력 전송장치 및 이를 이용한 무선충전공간을 구축하는 방법 |
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JP2015106940A (ja) * | 2013-11-28 | 2015-06-08 | Tdk株式会社 | コイルユニット |
JP2015192505A (ja) * | 2014-03-27 | 2015-11-02 | パナソニックIpマネジメント株式会社 | 非接触給電装置及び非接触給電装置の漏れ磁界測定方法 |
WO2015170510A1 (ja) * | 2014-05-07 | 2015-11-12 | 株式会社エクォス・リサーチ | 電力伝送システム |
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Also Published As
Publication number | Publication date |
---|---|
JP5488698B2 (ja) | 2014-05-14 |
EP2613424B1 (en) | 2016-05-18 |
CN103081293B (zh) | 2016-02-03 |
US20130147283A1 (en) | 2013-06-13 |
EP2613424A1 (en) | 2013-07-10 |
EP2613424A4 (en) | 2014-04-23 |
JPWO2012029179A1 (ja) | 2013-10-28 |
CN103081293A (zh) | 2013-05-01 |
KR20130041987A (ko) | 2013-04-25 |
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