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WO2025009280A1 - Système d'alimentation électrique sans fil et dispositif de transmission de puissance - Google Patents

Système d'alimentation électrique sans fil et dispositif de transmission de puissance Download PDF

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Publication number
WO2025009280A1
WO2025009280A1 PCT/JP2024/018770 JP2024018770W WO2025009280A1 WO 2025009280 A1 WO2025009280 A1 WO 2025009280A1 JP 2024018770 W JP2024018770 W JP 2024018770W WO 2025009280 A1 WO2025009280 A1 WO 2025009280A1
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WO
WIPO (PCT)
Prior art keywords
housing
power receiving
power
receiving device
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/018770
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English (en)
Japanese (ja)
Inventor
航陽 貝和
達也 細谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
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Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Publication of WO2025009280A1 publication Critical patent/WO2025009280A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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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
    • H02J50/10—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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception

Definitions

  • the present invention relates to a wireless power supply technology that is not adversely affected by the complex external shape of the power receiving device.
  • At least one of the multiple power transmission coils is arranged to have a coil plane that intersects with the coil planes of the other power transmission coils. Current is selectively supplied to the multiple power transmission coils and the power transmission resonator.
  • Patent No. 6767119
  • Patent Document 1 uses multiple power transmission coils whose coil surfaces intersect with each other, which results in a large device.
  • small electronic devices such as in-the-ear hearing aids have complex external shapes, and in some cases the external shapes are customized to fit the user's body.
  • the power transmitting device it has not been easy to place them on the power transmitting device with a high degree of freedom in placement, regardless of the placement orientation on the power transmitting device, and to increase the coupling between the power transmitting coil and the power receiving coil so that the power receiving device can obtain large amounts of power.
  • the object of the present invention is therefore to provide a wireless power transfer technology that can suppress the adverse effects of the complex external shape of the power receiving device, allow the power receiving device to be placed on the power transmitting device with a high degree of freedom in placement, and increase the electromagnetic field coupling between the power transmitting coil and the power receiving coil.
  • the wireless power supply system of the present invention comprises a power transmitting device having a wireless power transmitting circuit including a power transmitting coil configured using a first annular conductor, and a power receiving device having a wireless power receiving circuit including a power receiving coil configured using a second annular conductor, and performs resonant wireless power supply by forming electromagnetic resonance coupling between the power transmitting coil and the power receiving coil.
  • the power receiving device has an outer shape with more than eight vertices, and comprises a power receiving device housing in which the power receiving coil is disposed.
  • the power transmitting device comprises a power transmitting device housing in which a recessed housing portion large enough to accommodate the power receiving device housing is formed.
  • the recessed housing portion has a bottom surface and a side surface extending upright from the bottom surface.
  • the power receiving device housing has point or line contact at two or more locations on the side surface in a first direction that is normal to the bottom surface in a plurality of positions, or at one or more locations on each of the bottom surface and side surface.
  • the first annular conductor is a convoluted shape having a first opening, and is positioned at a position where the concave accommodating portion is positioned within the first opening, and is positioned between the top end of the power receiving device housing in the accommodated state, or the top end of the concave accommodating portion that is closer to the bottom surface, and the bottom surface.
  • the power receiving device housing is accommodated in the concave accommodating portion.
  • the housing of the power receiving device has a complex external shape, the effect of the state of accommodation in the recessed accommodation portion of the power receiving device is suppressed, and the second annular conductor is placed in a stable position relative to the recessed accommodation portion of the power transmitting device.
  • the first annular conductor is then placed in a position where their openings overlap with the second annular conductor, which is placed in a stable position.
  • FIG. 1 is a functional block diagram of a wireless power supply system according to an embodiment of the present invention.
  • FIG. 2A is a perspective view of a power receiving device according to an embodiment of the present invention
  • FIG. 2B is a first side view of the power receiving device
  • FIG. 2C is a second side view of the power receiving device.
  • FIG. 3A is a perspective view showing a part of a power transmission device according to an embodiment of the present invention
  • FIG. 3B is a side cross-sectional view of the power transmission device.
  • FIG. 4A is a perspective view showing a state in which a power receiving device according to an embodiment of the present invention is disposed on a power transmitting device
  • FIG. 4B is a side cross-sectional view of this state.
  • FIG. 5 is a diagram showing an example of a method of arranging a power receiving device in a power transmitting device according to an embodiment of the present invention.
  • FIG. 6 is a perspective view of a power transmitting device capable of wirelessly supplying power to a plurality of power receiving devices at the same time.
  • the power receiving resonant circuit is electrically connected to the input terminal of the rectifying smoothing circuit 24.
  • the output terminal of the rectifying smoothing circuit 24 is electrically connected to the input terminal of the charging control circuit 25.
  • the output terminal of the charging control circuit 25 is electrically connected to the secondary battery 26.
  • the secondary battery 26 is electrically connected to the load circuit 27.
  • the power transmission device 30 includes a power transmission control circuit 31, a switching circuit 32, a power transmission resonant capacitor 33, and a power transmission coil 34.
  • the power transmission control circuit 31 is electrically connected to a direct current power source DC and is electrically connected to a control signal input terminal of the switching circuit 32.
  • the power input terminal of the switching circuit 32 is electrically connected to the direct current power source DC.
  • the control signal input terminal of the switching circuit 32 is electrically connected to the power transmission control circuit 31.
  • the output terminal of the switching circuit 32 is connected to a series circuit of the power transmission resonant capacitor 33 and the power transmission coil 34.
  • the series circuit of the power transmission resonant capacitor 33 and the power transmission coil 34 constitutes a power transmission resonant circuit.
  • the circuit configuration of the power receiving device 20 and the power transmitting device 30 described above is an example, and the power receiving coil 22 and the power receiving resonant capacitor 23 of the power receiving device 20 may be configured to be connected in parallel. Furthermore, the power receiving device 20 and the power transmitting device 30 need only have at least the configuration described above, and may also have other circuit configurations.
  • the power transmission control circuit 31 is realized by an MPU or the like.
  • the power transmission control circuit 31 is driven by DC power supplied from a DC power source DC.
  • the power transmission control circuit 31 generates a control signal for performing switching control at a predetermined switching frequency in the switching circuit 32, and outputs the control signal to the switching circuit 32.
  • the switching circuit 32 is configured using power semiconductor switching elements and the like.
  • the switching circuit 32 receives a control signal and performs on/off control (switching control) of the power semiconductor switching elements.
  • the DC voltage supplied to the switching circuit 32 from the DC power source DC is converted into an AC voltage of a switching frequency, and this AC current is supplied to the power transmission resonant circuit of the power transmission resonant capacitor 33 and the power transmission coil 34.
  • the resonant frequency of the power transmission resonant circuit is set to be approximately the same as the switching frequency.
  • the power transmission coil 34 excites an alternating magnetic field by an alternating current. This alternating magnetic field generates an external magnetic field by the power transmission coil 34.
  • the resonant frequency of the power receiving resonant circuit formed by the power receiving coil 22 and the power receiving resonant capacitor 23 is set to be approximately the same as the resonant frequency and switching frequency of the power transmitting resonant circuit.
  • the power receiving coil 22 and the power transmitting coil 34 form an electromagnetic resonant field, and DC resonant electromagnetic coupling (electromagnetic resonant coupling) is realized.
  • DC resonant electromagnetic coupling electromagnet resonance
  • the rectifying and smoothing circuit 24 is realized by various rectifying circuits using switching elements and smoothing capacitors.
  • the rectifying and smoothing circuit 24 converts the AC receiving current input from the receiving resonant circuit into DC power, smoothes it, and outputs a DC voltage (DC current) to the charging control circuit 25.
  • the charging control circuit 25 is realized by a voltage conversion circuit such as a DC-DC converter.
  • the charging control circuit 25 converts the input DC voltage into an output DC voltage for charging the secondary battery 26 and outputs it to the secondary battery 26.
  • the secondary battery 26 is charged by the input voltage (input current) from the charging control circuit 25.
  • Load circuit 27 receives a supply of load driving power from secondary battery 26 and performs the desired signal processing, etc.
  • load circuit 27 includes a microphone, a signal processing circuit such as a filter, an amplifier circuit, and a speaker.
  • Load circuit 27 receives a supply of load driving power, filters and amplifies the sound signal picked up by the microphone, and emits the sound from the speaker.
  • the power receiving device 20 includes a power receiving device housing 200, a power receiving coil 22, and a circuit module (not shown) of the power receiving device 20.
  • the power receiving device housing 200 includes a first housing section 201 and a second housing section 202.
  • the first housing unit 201 and the second housing unit 202 are aligned in the extension direction of the power receiving device housing 200 (longitudinal direction: z20 axis direction) and are physically connected to each other.
  • the end of the power receiving device housing 200 on the first housing unit 201 side is the first end E1 of the power receiving device housing 200
  • the end of the power receiving device housing 200 on the second housing unit 202 side is the second end E2 of the power receiving device housing 200.
  • the first housing part 201 and the second housing part 202 both have an internal space.
  • the internal space of the first housing part 201 and the internal space of the second housing part 202 are connected to each other.
  • the first housing unit 201 is generally cubic in shape with rounded corners.
  • the second housing unit 202 is generally cylindrical in shape with rounded corners.
  • the shape of the first housing unit 201 may be generally rectangular, generally spherical, etc.
  • the extension direction of the second housing unit 202 does not have to be parallel to the direction in which the first housing unit 201 and the second housing unit 202 are aligned.
  • the extension direction of the second housing unit 202 may have a predetermined angle (not 0°) with respect to the direction in which the first housing unit 201 and the second housing unit 202 are aligned, based on the shape of the wearer's ear canal, etc.
  • the second housing unit 202 may be curved or bent at a position midway in the extension direction.
  • the first housing unit 201 has a housing orthogonal cross-sectional area S201 of the first housing unit 201 as the maximum cross-sectional area in the cross-sectional area perpendicular to the direction in which the first housing unit 201 and the second housing unit 202 are arranged.
  • the second housing part 202 has a housing orthogonal cross-sectional area S202 of the second housing part 202 as the maximum cross-sectional area in the cross-sectional area perpendicular to the direction in which the first housing part 201 and the second housing part 202 are arranged.
  • the orthogonal cross-sectional area S201 of the first housing part 201 is larger than the orthogonal cross-sectional area S202 of the second housing part 202.
  • the power receiving device housing 200 has at least a number of corners CN11, CN12, CN13, CN14, CN21, CN22, CN23, CN24, CN31, CN32, CN41, CN42, CN43, and CN44. Note that in the power receiving device housing 200, these corners are chamfered to be rounded, but the shape of the corners is not limited to this.
  • the power receiving device housing 200 has a complex shape with more than eight vertices.
  • the receiving coil 22 is constructed using a spiral annular conductor (second annular conductor) having an opening (second opening).
  • the second annular conductor is disposed inside the first housing part 201.
  • the second annular conductor is disposed at a predetermined position between the first end part E1 of the first housing part 201 and the connection end to the second housing part 202.
  • the axial direction of the second annular conductor (axial direction of the swirling shape: direction perpendicular to the second opening surface) is approximately parallel to the direction in which the first housing part 201 and the second housing part 202 are aligned (z20 axis direction).
  • the circuit module of the power receiving device 20 includes the power receiving resonant capacitor 23, the charge control circuit 25, the secondary battery 26, and the load circuit 27 shown in FIG. 1.
  • the circuit module of the power receiving device 20 is divided into at least two parts.
  • the first part including the power receiving resonant capacitor 23, the charge control circuit 25, and the secondary battery 26 is disposed inside the first housing unit 201. More specifically, the first part is disposed inside the first housing unit 201 and on the inside of the second annular conductor when viewed in a direction perpendicular to the first end E1.
  • the second part including the load circuit 27 is disposed inside the second housing unit 202.
  • FIG. 3A is a perspective view showing a part of a power transmission device according to an embodiment of the present invention
  • FIG. 3B is a side cross-sectional view of the power transmission device.
  • the power transmission device 30 includes a power transmission device housing H30, a power transmission coil 34, and a circuit module (not shown) of the power transmission device 30.
  • the power transmission device housing H30 has a top surface F30 and a recess 300.
  • the recess 300 corresponds to the recessed housing portion.
  • the recess 300 is recessed from the top surface F30 of the power transmission device housing H30.
  • the recess 300 includes a first storage section 301 and a second storage section 302.
  • the first storage section 301 and the second storage section 302 are in communication with each other.
  • the first housing portion 301 is cylindrical and has a constant diameter ⁇ 301.
  • the axial direction of the cylinder (the direction in which the dashed line in FIG. 3(B) extends) is perpendicular to the top surface F30 of the power transmission device housing H30.
  • One end of the cylinder in the axial direction opens from the top surface F30 to the outside. This opening becomes the opening OP300 of the recess 300.
  • the first storage section 301 has a side surface F301.
  • the side surface F301 is approximately parallel to the depth direction of the recess 300.
  • the second storage section 302 is generally conical in shape, with a circular tip of a given area.
  • the second storage section 302 is connected to the first storage section 301 at the bottom of the generally conical shape.
  • the diameter of the second storage section 302 at this part is equal to the diameter of the first storage section 301.
  • the diameter of the second storage section 302 becomes smaller the further away from the first storage section 301 it is in the height direction of the approximately conical shape, in other words, in the depth direction of the recess 300.
  • the second storage section 302 has a side surface F302.
  • the side surface F302 has a predetermined angle with respect to the depth direction of the recess 300, and the distance to the central axis becomes shorter the farther away from the first storage section 301.
  • the second storage section 302 has a bottom surface BT300.
  • the bottom surface BT300 is circular when viewed in a direction parallel to the central axis, and has a diameter ⁇ 309.
  • the recess 300 opens with a diameter ⁇ 301 at the top surface F30
  • the first storage section 301 also has a diameter ⁇ 301
  • the diameter gradually decreases from diameter ⁇ 301 at the second storage section 302, and becomes a diameter ⁇ 309 ( ⁇ 301) at the bottom surface BT300.
  • the power transmission coil 34 is constructed using a spiral-shaped annular conductor (first annular conductor) having an opening (first opening).
  • the first annular conductor is disposed inside the power transmission device housing H30. More specifically, the first annular conductor is disposed at a position where the first housing 301 is disposed inside the first opening, between the upper end of the first housing 301 (position of the opening OP300) and the connection part to the second housing 302 (the deepest part of the first housing 301).
  • the axial direction of the first annular conductor (the axial direction of the convoluted shape) is approximately parallel to the axial direction of the first accommodating section 301, in other words, the depth direction of the recess 300.
  • the circuit module of the power transmission device 30 includes at least the power transmission control circuit 31, the switching circuit 32, and the power transmission resonant capacitor 33 shown in FIG. 1.
  • the circuit module of the power transmission device 30 is disposed in a position that does not block the magnetic field generated by the power transmission coil 34 (first annular conductor).
  • FIG. 4A is a perspective view showing a state in which a power receiving device according to an embodiment of the present invention is disposed on a power transmitting device
  • FIG. 4B is a side cross-sectional view of this state.
  • the diameter ⁇ 301 of the first housing portion 301 in the recess 300 of the power transmitting device 30 is larger than the diameter of the surface of the housing orthogonal cross-sectional area S201 of the first housing portion 201 of the power receiving device 20 (referred to as the maximum diameter of the first housing portion 201). Note that the diameter ⁇ 301 is not significantly larger than the maximum diameter of the first housing portion 201, but is approximately the same as and larger.
  • the diameter ⁇ 309 of the bottom surface of the second housing portion 302 is at least twice the distance between the tip of the second end E2 of the second housing portion 202 of the power receiving device housing 200 and the central axis Ax20 of the power receiving device housing 200 when the power receiving device housing 200 is housed in the recess 300.
  • the central axis Ax20 of the power receiving device housing 200 is approximately parallel to the direction in which the first housing part 201 and the second housing part 202 in the power receiving device housing 200 are aligned, as shown primarily in FIG. 2(B), and is a straight line located at a position where the maximum distance L2011 and the maximum distance L2012 of the surfaces facing each other across the central axis Ax20 in the first housing part 201 coincide.
  • the power receiving device housing 200 is accommodated in the recess 300 so that the second housing section 202 is inserted at a deeper position than the first housing section 201. More specifically, the power receiving device housing 200 has the first housing section 201 disposed in the first housing section 301 and at least a portion of the second housing section 202 disposed in the second housing section 302.
  • the central axis of the recess 300 and the central axis Ax20 of the power receiving device housing 200 are approximately parallel to each other and are arranged at approximately the same position. Since the shape of the first housing section 301 and the shape of the first housing section 201 are in the above-mentioned relationship, and the shape of the second housing section 302 and the shape of the second housing section 202 are in the above-mentioned relationship, the housing section orthogonal cross-sectional area of the first housing section 301 is larger than the housing orthogonal cross-sectional area of the first housing section 201 at any position in the direction in which each central axis extends. Furthermore, the housing section orthogonal cross-sectional area of the second housing section 302 is larger than the housing orthogonal cross-sectional area of the second housing section 202 at any position in the direction in which each central axis extends.
  • the power receiving device housing 200 makes point or line contact with the recess 300 at two or more locations on the side F301 and the side F302 in a first direction that is the normal direction of the bottom surface BT300 of the second accommodation section 302 of the recess 300 in a plurality of postures.
  • the power receiving device housing 200 contacts the side surface F301 of the first housing section 301 at a first position PCH that is furthest away in a direction perpendicular to the central axis on one end side of the central axis of the first housing section 201, and at a second position PCL that is furthest away in a direction perpendicular to the central axis on the other end side.
  • the first position PCH and the second position PCL are different in position in a direction parallel to the central axis (depth direction of the recess 300: first direction). In the first direction, the first position PCH is closer to the opening OP300 at the upper end of the recess 300 than the second position PCL.
  • the power receiving device housing 200 When the power receiving device housing 200 is accommodated in the recess 300 in this manner, the power receiving device housing 200 rotates about the central axis and assumes multiple positions, but always comes into contact with the sides of the recess 300 at multiple positions between the top end (opening OP300) of the recess 300 in the first direction and the bottom surface BT300, ensuring a stable position.
  • the power receiving device housing 200 may be in point contact or line contact with the bottom surface BT300 and the side surface F301 and side surface F302 at one or more points in each of the recessed portion 300 in a plurality of positions.
  • the power receiving device housing 200 is accommodated in the recessed portion 300 so that the second end E2 of the second housing part 202 contacts the bottom surface BT300 of the recessed portion 300 (contact at the bottom surface position PCB) and contacts at least one point corresponding to the first position PCH and the second position PCL.
  • the power receiving device housing 200 rotates around the central axis and assumes a plurality of positions, it always contacts at multiple positions between the upper end (opening OP300) of the recessed portion 300 in the first direction and the bottom surface BT300, and on the bottom surface BT300, and the position is stable.
  • the power receiving device housing 200 is housed in the recess 300 so that the central axis (first central axis) of the power transmitting coil 34 (first annular conductor) passes through the opening (second opening) of the power receiving coil 22 (second annular conductor).
  • the wireless power supply system 10 can increase the magnitude of the electromagnetic field coupling between the power transmission coil 34 and the power receiving coil 22 regardless of the position of the power receiving device 20 relative to the power transmission device 30.
  • the wireless power supply system 10 can supply power from the power transmission device 30 to the power receiving device 20 with low loss and high efficiency, even if the power receiving device 20 has a complex external shape.
  • the wireless power supply system 10 suppresses the adverse effects of the complex external shape of the power receiving device 20, allows the power receiving device 20 to be placed on the power transmission device 30 with high freedom of placement, and can increase the electromagnetic field coupling between the power transmission coil 34 and the power receiving coil 22, allowing large power to be supplied.
  • the power transmission coil 34 (first annular conductor) is disposed between the top contact portion (first position PCH in the figure) that is the farthest from the bottom surface BT300 among the two or more contact portions, and the bottom surface BT300.
  • the power receiving coil 22 (second annular conductor) is disposed between the position closest to the second end E2 of the power receiving device housing 200 (position closest to the bottom surface BT300) and the top contact portion (first position PCH in the figure) (including the top contact portion).
  • the power transmission coil 34 (first annular conductor) and the power receiving coil 22 (second annular conductor) are positioned close to each other in the depth direction of the recess 300. Therefore, the magnetic flux loop created by the power transmission coil 34 (first annular conductor) is even more greatly linked to the power receiving coil 22 (second annular conductor).
  • the power transmission coil 34 (first annular conductor) is disposed at a position closer to the first position PCH than the bottom surface BT300 in the depth direction (first direction) of the recess 300.
  • the power receiving coil 22 (second annular conductor) is disposed at a position closer to the upper end (first end E1) than the lower end (second end E2) when the power receiving device housing 200 is accommodated in the recess 300.
  • the power transmission coil 34 (first annular conductor) and the power receiving coil 22 (second annular conductor) are positioned close to each other in the depth direction of the recess 300. Therefore, the magnetic flux loop created by the power transmission coil 34 (first annular conductor) is even more greatly linked to the power receiving coil 22 (second annular conductor).
  • the power transmission coil 34 (first annular conductor) and the power receiving coil 22 (second annular conductor) overlap in the depth direction (first direction) of the recess 300.
  • the power receiving device housing 200 is housed in the recess 300 so that the central axis (first central axis) of the power transmitting coil 34 (first annular conductor) and the central axis (second central axis) of the power receiving coil 22 (second annular conductor) are parallel.
  • the first end E1 of the power receiving device housing 200 protrudes outward beyond the upper end (opening OP300) of the recess 300.
  • the recess 300 may be shaped so that the entire power receiving device housing 200 is housed therein.
  • the recess 300 may be shaped so that when the power receiving device housing 200 is housed in the recess 300, the first end E1 of the power receiving device housing 200 is located closer to the bottom surface BT300 than the upper end (opening OP300) of the recess 300.
  • the power transmission coil 34 (first annular conductor) is located between the first end E1 and the bottom surface BT300 when the power receiving device housing 200 is housed in the recess 300. This ensures that the power transmission coil 34 (first annular conductor) and the power receiving coil 22 (second annular conductor) are positioned closer to each other in the depth direction of the recess 300.
  • (Method of Arranging Power Receiving Device 20 on Power Transmitting Device 30) 5 is a diagram showing an example of a method of arranging a power receiving device in a power transmitting device according to an embodiment of the present invention.
  • the power receiving device 20 is a device to be worn on an ear, such as a hearing aid.
  • the user When using the power receiving device 20, the user wears the power receiving device 20 on the ear. At this time, the user wears the power receiving device 20 so that the second housing part 202 is housed in the ear canal. In this case, the first housing part 201 is exposed to the outside from the ear.
  • the user When placing the power receiving device 20 on the power transmitting device 30 in this state in order to charge the secondary battery 26 of the power receiving device 20, the user typically pinches the first housing part 201 exposed to the outside from the ear and removes the power receiving device 20 from the ear.
  • the user holds the first housing part 201 and places it in the recess 300 of the power transmission device 30.
  • the power receiving device housing 200 of the power receiving device 20 is placed in the recess 300 of the power transmission device 30 and fixed as described above.
  • the user does not need to change hands to accommodate the power receiving device 20 in the power transmitting device 30.
  • the user can easily accommodate the power receiving device 20 in the power transmitting device 30 with a natural removal action.
  • the power receiving device 20 is accommodated in the power transmitting device 30 in a state that allows for increased electromagnetic field coupling between the power transmitting coil 34 and the power receiving coil 22. Therefore, the wireless power supply system 10 can supply large power from the power transmitting device 30 to the power receiving device 20.
  • FIG. 6 is a perspective view of a power transmission device capable of wirelessly supplying power to multiple power receiving devices simultaneously.
  • the power transmission device 30A includes a power transmission device housing H30A, a recess 3001, a recess 3002, a power transmission coil 341, and a power transmission coil 342.
  • a circuit module on the power transmission device side that supplies AC voltage (AC current) for power supply to the power transmission coil 341 and the power transmission coil 342 is housed inside the power transmission device housing H30A.
  • the recesses 3001 and 3002 are recessed from the top surface F30 of the power transmission device housing H30A.
  • the shapes of the recesses 3001 and 3002 are the same as the recess 300 described above.
  • the recesses 3001 and 3002 are disposed at a distance from each other.
  • the recess 3001 has an opening OP3001 on the upper surface F30.
  • the recess 3002 has an opening OP3002 on the upper surface F30.
  • the power transmission coil 341 and the power transmission coil 342 are constructed using a wound annular conductor having an opening.
  • the annular conductors constituting the power transmission coil 341 and the power transmission coil 342 have the same configuration as the first annular conductor constituting the power transmission coil 34.
  • the arrangement of the annular conductor constituting the power transmission coil 341 in the recess 3001 and the arrangement of the annular conductor constituting the power transmission coil 342 in the recess 3002 are the same as the arrangement of the first annular conductor constituting the power transmission coil 34 in the recess 300.
  • Multiple power receiving devices are respectively accommodated in recesses 3001 and 3002.
  • the state in which the multiple power receiving devices are accommodated in recesses 3001 and 3002 is the same as the state in which power receiving device 20 is accommodated in recess 300 described above.
  • the power transmission device 30A can wirelessly supply power to multiple power receiving devices simultaneously.
  • the power transmission device 30A can increase the electromagnetic field coupling between the power receiving coil of the power receiving device housed in the recess 3001 and the power transmission coil 341, and can increase the electromagnetic field coupling between the power receiving coil of the power receiving device housed in the recess 3002 and the power transmission coil 342. This allows the power transmission device 30A to supply power to multiple power receiving devices with low loss and high efficiency.
  • recesses 3001 and 3002 have the same shape. However, recesses 3001 and 3002 may have different shapes according to the shape of the power receiving device housing of the power receiving device to be accommodated therein, in accordance with the shape of recess 300 described above.
  • the power transmission device 30A may have three or more recesses.
  • a power transmitting device including a wireless power transmitting circuit including a power transmitting coil configured using a first annular conductor; a power receiving device including a wireless power receiving circuit including a power receiving coil configured using a second annular conductor;
  • a resonant wireless power supply system that performs wireless power supply by forming electromagnetic resonance coupling between the power transmitting coil and the power receiving coil, the power receiving device has an outer shape having more than eight vertices, and includes a power receiving device housing in which the power receiving coil is disposed;
  • the power transmission device includes a power transmission device housing having a recessed housing portion large enough to accommodate the power reception device housing, The recessed housing portion has a bottom surface and a side surface extending upright from the bottom surface, the power receiving device housing is in point contact or line contact at two or more points on the side surface or at one or more points on each of the bottom surface and the side surface in a first direction that is a normal line to the bottom surface in a plurality of postures; the first annular conductor is a convolute
  • the second annular conductor has a convoluted shape having a second opening and is disposed within the housing of the power receiving device;
  • the wireless power supply system of ⁇ 1> wherein the power receiving device housing is accommodated in the concave accommodation portion so that a first central axis of the first annular conductor passes through the second opening of the second annular conductor.
  • the power transmitting device includes a power transmitting resonant capacitor that configures a resonant circuit together with the power transmitting coil
  • the power receiving device includes a power receiving resonant capacitor that configures a resonant circuit together with the power receiving coil
  • the wireless power supply system according to ⁇ 1> or ⁇ 2>, wherein the electromagnetic resonance coupling is formed by the power transmitting coil, the power transmitting resonant capacitor, and the power receiving coil and the power receiving resonant capacitor to supply power wirelessly.
  • the power transmission coil is disposed between the bottom surface and an upper end contact portion, which is farthest from the bottom surface among the two or more contact portions;
  • the power transmitting coil is disposed at a position closer to the upper end contact portion than the bottom surface in the first direction
  • ⁇ 6> A wireless power supply system according to any one of ⁇ 1> to ⁇ 5>, in which the power receiving device housing is accommodated in the recessed housing so that the first central axis of the first annular conductor and the second central axis of the second annular conductor are parallel.
  • the recessed housing portion is a cylindrical first housing portion including the upper end and having a constant orthogonal cross-sectional area regardless of a position in the first direction; a cone-shaped second housing portion that is connected to the first housing portion, has a bottom surface, and has a housing portion orthogonal cross-sectional area perpendicular to the first direction that increases as the housing portion approaches the top end from the bottom surface in the first direction; Equipped with
  • the power receiving device housing includes: a first housing portion having a large housing orthogonal cross-sectional area perpendicular to an extension direction of the power receiving device housing; A second housing portion having a smaller cross-sectional area in the orthogonal direction of the housing; Equipped with the power receiving device housing is accommodated in the recessed housing portion such that at least a portion of the first housing portion is accommodated inside the first housing portion; When the power receiving device housing is accommodated in the recessed housing, At any position in the first direction, A housing orthogonal cross-sectional area of the first housing portion is larger than a housing
  • the power transmitting coil is disposed at a position corresponding to the first housing portion in the first direction,
  • a wireless power supply system according to any one of ⁇ 1> to ⁇ 8>, in which the position of the first annular conductor and the position of the second annular conductor in the first direction overlap.
  • a wireless power transmission circuit including a power transmission coil formed using a first annular conductor, A power transmitting device of a wireless power feeding system that wirelessly feeds power by coupling an electromagnetic field excited by a power transmitting coil to a power receiving coil housed in a power receiving device housing having an external shape having more than eight vertices, a power transmission device housing having a recessed housing portion large enough to accommodate the power reception device housing, the recessed housing portion has a bottom surface and a side surface extending upright from the bottom surface, and the power receiving device housing has a shape in which the power receiving device housing is in point contact or line contact at two or more points on the side surface or at one or more points on each of the bottom surface and the side surface in a first direction that is a normal line to the bottom surface in a plurality of postures; A power transmission device, wherein the first annular conductor is a convoluted conductor having a first opening, and is positioned at a position where the recessed accommodating portion is disposed within the first opening and between an
  • the recessed housing portion is a first storage portion having a bottom surface and a cross-sectional area perpendicular to the first direction that increases as the cross-sectional area approaches the top end from the bottom surface in the first direction; a cylindrical second housing portion that is in communication with the first housing portion, includes the upper end, and has a constant cross-sectional area perpendicular to the first direction regardless of a position in the first direction;
  • the first storage portion has a truncated cone shape
  • a wireless power supply system according to any one of ⁇ 1> to ⁇ 9>, in which the frequency of the magnetic field that generates the electromagnetic resonance coupling is in the 6.78 MHz band or the 13.56 MHz band of the ISM band.
  • ⁇ 16> The wireless power supply system according to any one of ⁇ 1> to ⁇ 9> and ⁇ 15>, wherein the power receiving device includes a secondary battery in the power receiving device housing that is electrically connected to the wireless power receiving circuit.
  • ⁇ 18> The wireless power supply system of ⁇ 16> or ⁇ 17>, wherein the power receiving device includes a power receiving circuit that is electrically connected to the wireless power receiving circuit and the secondary battery.
  • ⁇ 20> The wireless power supply system according to any one of ⁇ 1> to ⁇ 9> and ⁇ 15> to ⁇ 19>, wherein the power transmission device has a plurality of the recessed housing portions.
  • Wireless power supply system 20 Power receiving device 21: Power receiving circuit 22: Power receiving coil 23: Power receiving resonant capacitor 24: Rectification smoothing circuit 25: Charging control circuit 26: Secondary battery 27: Load circuit 30, 30A: Power transmitting device 31: Power transmission control circuit 32: Switching circuit 33: Power transmitting resonant capacitor 34: Power transmitting coil 200: Power receiving device housing 201: First housing part 202: Second housing part 300: Recess 301: First Housing 302: Second housing 341, 342: Power transmission coil 3001, 3002: Recess Ax20: Central axis BT300: Bottom surface DC: DC power source E1: First end E2: Second end F30: Top surface F301, F302: Side surface H30, H30A: Power transmission device housing OP300, OP3001, OP3002: Openings S201, S202: Housing orthogonal cross-sectional area PCB: Bottom surface position PCH: First position PCL: Second position

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Un système d'alimentation électrique sans fil (10) comprend : un dispositif de transmission de puissance (30) comprenant un circuit de transmission de puissance sans fil comprenant une bobine de transmission de puissance (34) configurée à l'aide d'un premier conducteur annulaire ; et un dispositif de réception de puissance (20) comprenant un circuit de réception de puissance sans fil comprenant une bobine de réception de puissance (22) configurée à l'aide d'un second conducteur annulaire. La bobine de transmission de puissance (34) et la bobine de réception de puissance (22) sont couplées électromagnétiquement pour effectuer une alimentation électrique sans fil. Le dispositif de réception de puissance (20) comprend un boîtier de dispositif de réception de puissance (200) qui présente une forme externe compliquée comportant une pluralité de sommets dépassant huit sommets et dans lequel la bobine de réception de puissance (22) est disposée. Le dispositif de transmission de puissance (30) comprend un boîtier de dispositif de transmission de puissance (H30) dans lequel une partie boîtier évidé (300) ayant une taille apte à recevoir le boîtier de dispositif de réception de puissance (200) est formée. La partie boîtier évidé (300) comprend une surface inférieure (BT300) et une surface latérale (F301) installée verticalement à partir de la surface inférieure (BT300). Le boîtier de dispositif de réception de puissance (200) effectue un contact ponctuel ou un contact en ligne dans une pluralité de postures à au moins deux emplacements sur la surface latérale dans une première direction qui est la normale à la surface inférieure ou à un ou plusieurs emplacements sur la surface inférieure et sur la surface latérale. Le premier conducteur annulaire présente une forme en spirale pourvue d'une première ouverture et est disposé dans une position dans laquelle la partie boîtier évidé (300) est disposée dans la première ouverture, et entre la surface inférieure et le côté de l'extrémité supérieure du boîtier de dispositif de réception de puissance (200) dans l'état logé ou l'extrémité supérieure de la partie boîtier évidé (300) qui est plus proche de la surface inférieure (BT300). Le boîtier de dispositif de réception de puissance (200) est logé dans la partie boîtier évidé (300) de telle manière qu'un premier axe central du premier conducteur annulaire passe à travers une seconde ouverture du second conducteur annulaire.
PCT/JP2024/018770 2023-07-06 2024-05-22 Système d'alimentation électrique sans fil et dispositif de transmission de puissance Pending WO2025009280A1 (fr)

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JP2023-111425 2023-07-06

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015125965A1 (fr) * 2014-02-24 2015-08-27 日東電工株式会社 Dispositif source d'alimentation pour appareil portatif, appareil portatif, et dispositif de charge
JP2019054336A (ja) * 2017-09-13 2019-04-04 株式会社村田製作所 アンテナ装置及び電子機器
JP2019057961A (ja) * 2017-09-19 2019-04-11 パナソニックＩｐマネジメント株式会社 非接触充電装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015125965A1 (fr) * 2014-02-24 2015-08-27 日東電工株式会社 Dispositif source d'alimentation pour appareil portatif, appareil portatif, et dispositif de charge
JP2019054336A (ja) * 2017-09-13 2019-04-04 株式会社村田製作所 アンテナ装置及び電子機器
JP2019057961A (ja) * 2017-09-19 2019-04-11 パナソニックＩｐマネジメント株式会社 非接触充電装置

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