Resonant capacitor module, non-contact power transmission system, and vehicle

Abstract

The invention provides a resonant capacitor module capable of suppressing magnetic radiation, a non-contact power transmission system, and a vehicle. A resonant capacitor module is provided with: a coil unit; a substrate portion electrically connected to the coil portion; and a power conversion unit electrically connected to the substrate unit, the substrate unit including: a first conductor unit on which a first resonant capacitor bank is mounted; and a second conductor part to which a second resonant capacitor bank is mounted, the second conductor part being disposed adjacent to the first conductor part and having a current flowing in the opposite direction to the first conductor part.

Description

Technical Field

[0001] The present invention relates to a resonant capacitor module, a contactless power transmission system, and a vehicle. Background Art

[0002] In recent years, research and development of secondary batteries that contribute to energy efficiency has been underway to ensure that more people have access to affordable, reliable, sustainable, and advanced energy.

[0003] Japanese Patent Application Laid-Open No. 2019-87593 discloses a wireless power transmission system for charging a storage battery (secondary battery) mounted on an electric vehicle, such as an electric car. This wireless power transmission system includes two resonators that use magnetic field resonance for wireless power transmission. Each resonator has a resonant circuit consisting of a coil and a capacitor. Summary of the Invention

[0004] Problems to be solved by the invention

[0005] Since the resonator handles high-voltage and high-frequency power, magnetic radiation, which is a source of electromagnetic interference, becomes a problem.

[0006] To solve the above-mentioned problems, the present invention aims to provide a resonant capacitor module, a contactless power transmission system, and a vehicle that can suppress magnetic radiation, and further contribute to improving energy efficiency.

[0007] In order to solve the above-mentioned problems and achieve the object, the present invention adopts the following aspects.

[0008] (1): A resonant capacitor module according to one embodiment of the present invention comprises: a coil portion; a substrate portion electrically connected to the coil portion; and a power conversion portion electrically connected to the substrate portion, wherein the substrate portion comprises: a first conductor portion on which a first resonant capacitor group is mounted; and a second conductor portion on which a second resonant capacitor group is mounted, wherein the second conductor portion is arranged adjacent to the first conductor portion and current flows in a direction opposite to that of the first conductor portion.

[0009] (2): In the above-mentioned aspect (1), the coil portion may include: one end portion electrically connected to the first conductor portion; and another end portion arranged adjacent to the one end portion, extending parallel to the one end portion, and electrically connected to the second conductor portion.

[0010] (3): In the above-mentioned scheme (1) or (2), the power conversion unit may include: a first switch unit electrically connected to the first conductor unit; and a second switch unit arranged adjacent to the first switch unit and electrically connected to the second conductor unit.

[0011] (4): In the above aspects (1) to (3), the first conductor portion including the first resonant capacitor group and the second conductor portion including the second resonant capacitor group may be provided on both surfaces of the substrate portion.

[0012] (5): In the above aspect (1), the substrate may include a third conductor portion that electrically connects the first conductor portion and the second conductor portion.

[0013] (6): In the above-mentioned scheme (5), it is possible that the substrate portion includes a first substrate portion and a second substrate portion, the first substrate portion is electrically connected to one end portion of the coil portion and includes the first conductor portion, the second conductor portion and the third conductor portion, and the second substrate portion is electrically connected to the other end portion of the coil portion and includes the first conductor portion, the second conductor portion and the third conductor portion.

[0014] (7): A contactless power transmission system according to one aspect of the present invention includes the resonant capacitor module according to any one of the aspects (1) to (6).

[0015] (8): A vehicle according to one aspect of the present invention includes the resonant capacitor module according to any one of the aspects (1) to (6).

[0016] According to the above embodiment, the first conductor portion, on which the first resonant capacitor group is mounted, and the second conductor portion, on which the second resonant capacitor group is mounted, are arranged adjacent to each other, and currents flow in opposite directions. Therefore, the magnetic field generated by the first conductor portion and the magnetic field generated by the second conductor portion cancel each other out. Consequently, magnetic radiation from the resonant capacitor module can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a plan view of the resonant capacitor module according to the first embodiment.

[0018] Figure 2 It is a cross-sectional view of the resonant capacitor module according to the first embodiment.

[0019] Figure 3 This is a circuit diagram of the resonant capacitor module according to the first embodiment.

[0020] Figure 4 This is a diagram for explaining the operation of the resonant capacitor module according to the first embodiment.

[0021] Figure 5 It is a cross-sectional view of a resonant capacitor module according to the second embodiment.

[0022] Figure 6 It is a plan view of a resonant capacitor module according to a third embodiment.

[0023] Figure 7 It is a cross-sectional view of a resonance capacitor module according to a third embodiment.

[0024] Figure 8 It is a schematic configuration diagram of a contactless power transmission system according to a fourth embodiment. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0026] (First embodiment)

[0027] Figure 1 It is a plan view of the resonant capacitor module 10 according to the first embodiment. Figure 2 It is a cross-sectional view of the resonant capacitor module 10 according to the first embodiment. Figure 3 1 is a circuit diagram of the resonant capacitor module 10 according to the first embodiment.

[0028] As shown in these figures, the resonant capacitor module 10 includes a coil unit 20 , a substrate unit 30 electrically connected to the coil unit 20 , and a power conversion unit 40 electrically connected to the substrate unit 30 .

[0029] In the following description, an XYZ orthogonal coordinate system is sometimes used, and the positional relationships of various components are described with reference to this XYZ orthogonal coordinate system. The X-axis direction is the first horizontal direction. The Y-axis direction is the second horizontal direction orthogonal to the first horizontal direction. The Z-axis direction is the vertical direction orthogonal to the first and second horizontal directions.

[0030] like Figure 2 As shown, the substrate unit 30 and the power conversion unit 40 are housed within a metal housing 50. The metal housing 50 includes a bottom housing 51 and an upper cover 52. The bottom housing 51 is shaped like a box with a bottom and an open top. The upper cover 52 is shaped like a flat plate that closes the upper opening of the bottom housing 51 and is screwed to the upper opening edge of the bottom housing 51.

[0031] The power conversion unit 40 is disposed at the bottom of the bottom housing 51. A heat dissipation structure 53 is mounted on the lower surface of the power conversion unit 40. The heat dissipation structure 53 has a plurality of fins protruding outward from the metal housing 50. The heat dissipation structure 53 is screwed into the bottom opening of the bottom housing 51.

[0032] The substrate portion 30 is supported in a horizontal position inside the metal housing 50. The substrate portion 30 is mounted on a base provided at the bottom of the bottom housing 51. The substrate portion 30 is, for example, a printed circuit board and has a substantially rectangular shape extending in the X-axis direction. Figure 1 As shown, a first conductor portion 31A and a second conductor portion 31B are formed on the upper surface 30 a of the substrate portion 30 .

[0033] The first conductor portion 31A is a conductor pattern extending in the X-axis direction, and is mounted with the first resonant capacitor group 32A. Specifically, the first conductor portion 31A has a first portion whose end on the +X side is electrically connected to the coil unit 20, a second portion whose end on the -X side is connected to the power conversion unit 40, and a third portion connecting the first and second portions.

[0034] The third section is composed of multiple conductor patterns extending parallel to the X-axis and spaced apart in the Y-axis direction. Multiple resonant capacitors (first resonant capacitor group 32A) are mounted on each of these conductor patterns. The first and second sections function as busbars that distribute power to the first resonant capacitor group 32A.

[0035] The second conductor portion 31B is arranged adjacent to the first conductor portion 31A in the Y-axis direction and extends parallel to the first conductor portion 31A in the X-axis direction. The second conductor portion 31B is a conductor pattern extending in the X-axis direction and is mounted with a second resonant capacitor bank 32B. Specifically, the second conductor portion 31B has a first portion electrically connected to the coil portion 20 at its +X end, a second portion connected to the power converter 40 at its -X end, and a third portion connecting the first and second portions.

[0036] The third section is composed of multiple conductor patterns extending parallel to the X-axis and spaced apart in the Y-axis direction. Multiple resonant capacitors (second resonant capacitor group 32B) are mounted on each of these conductor patterns. The first and second sections function as busbars that distribute power to the second resonant capacitor group 32B.

[0037] The coil unit 20 is provided with Figure 1 and Figure 2 The winding body (not shown) and the one end portion 21 and the other end portion 22 extending from the winding body are electrically connected to the first portion of the first conductor portion 31A on the +X side via the contact member 61. The other end portion 22 of the coil portion 20 is electrically connected to the first portion of the second conductor portion 31B on the +X side via the contact member 62.

[0038] One end portion 21 of the coil portion 20 extends in the Y-axis direction and is disposed on the lower surface 30b side of the substrate portion 30 (see FIG. Figure 2 The other end portion 22 of the coil portion 20 is also disposed on the lower surface 30b side of the substrate portion 30. Figure 1 As shown, the other end portion 22 of the coil portion 20 is arranged adjacent to the one end portion 21 in the X-axis direction and extends in parallel with the one end portion 21 in the Y-axis direction. The contact members 61 and 62 are arranged offset in the X-axis direction.

[0039] The power converter 40 includes a first switch 41 and a second switch 42. The first switch 41 is electrically connected to the second portion of the first conductor 31A on the -X side via a pair of contact members 63. The first switch 41 includes a pair of DC connection terminals 41a.

[0040] The second switch unit 42 is electrically connected to the second portion of the second conductor portion 31B on the −X side via a pair of contact members 64. The second switch unit 42 includes a pair of DC connection terminals 42a and is arranged adjacent to the first switch unit 41 in the Y-axis direction.

[0041] like Figure 3 As shown, the first switching unit 41 and the second switching unit 42 include switching elements (power semiconductors) and freewheeling diodes on the upper and lower arms, respectively. The power converter 40 includes the first switching unit 41, the second switching unit 42, and a smoothing capacitor 43, forming an inverter circuit that converts DC power to AC power. The power converter 40 can form a converter circuit that converts AC power to DC power, or it can further include a switching unit to form both an inverter circuit and a converter circuit.

[0042] When AC power is supplied from the power conversion unit 40 to the coil unit 20, as shown in FIG. Figure 1 As shown, currents flow in opposite directions in one end portion 21 of the coil portion 20, the first conductor portion 31A, and the first switch portion 41 and in the other end portion 22 of the coil portion 20, the second conductor portion 31B, and the second switch portion 42. Figure 1 , a current A1 flows from the −X side to the +X side of the first conductor portion 31A, and a current A2 flows from the +X side to the −X side of the second conductor portion 31B. The directions of the currents A1 and A2 are alternately switched.

[0043] Figure 4 This is a diagram for explaining the operation of the resonant capacitor module 10 according to the first embodiment.

[0044] like Figure 4 As shown, one end 21 of the coil 20, the first conductor 31A, and the first switch 41 are positioned adjacent to the other end 22 of the coil 20, the second conductor 31B, and the second switch 42, allowing current to flow in opposite directions. Consequently, the magnetic field generated by the one end 21 of the coil 20, the first conductor 31A, and the first switch 41 and the magnetic field generated by the other end 22 of the coil 20, the second conductor 31B, and the second switch 42 cancel each other out. Consequently, magnetic radiation from the resonant capacitor module 10 can be suppressed.

[0045] Thus, the resonant capacitor module 10 described above includes a coil portion 20, a substrate portion 30 electrically connected to the coil portion 20, and a power conversion portion 40 electrically connected to the substrate portion 30. The substrate portion 30 includes a first conductor portion 31A on which a first resonant capacitor bank 32A is mounted, and a second conductor portion 31B on which a second resonant capacitor bank 32B is mounted. The second conductor portion 31B is positioned adjacent to the first conductor portion 31A and allows current to flow in a direction opposite to that of the first conductor portion 31A. This configuration cancels out the magnetic field generated by the first conductor portion 31A and the magnetic field generated by the second conductor portion 31B, thereby suppressing magnetic radiation from the resonant capacitor module 10.

[0046] In this embodiment, the coil portion 20 includes one end portion 21 electrically connected to the first conductor portion 31A, and another end portion 22 disposed adjacent to and extending parallel to the one end portion 21 and electrically connected to the second conductor portion 31B. This configuration cancels out the magnetic field generated by the one end portion 21 of the coil portion 20 and the magnetic field generated by the other end portion 22 of the coil portion 20, thereby suppressing magnetic radiation from the resonant capacitor module 10.

[0047] In this embodiment, the power converter 40 includes a first switch section 41 electrically connected to the first conductor section 31A, and a second switch section 42 disposed adjacent to the first switch section 41 and electrically connected to the second conductor section 31B. This configuration cancels out the magnetic field generated by the first switch section 41 and the magnetic field generated by the second switch section 42, thereby suppressing magnetic radiation from the resonant capacitor module 10.

[0048] (Second embodiment)

[0049] Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and their descriptions will be simplified or omitted.

[0050] Figure 5 It is a cross-sectional view of a resonant capacitor module 10 according to the second embodiment.

[0051] like Figure 5 As shown, in the second embodiment, a first conductor portion 31A including a second resonant capacitor group 32B and a second conductor portion 31B including a second resonant capacitor group 32B are provided on both the upper surface 30a and the lower surface 30b of the substrate portion 30. This structure can suppress magnetic radiation and increase the integration density of the multiple resonant capacitors on the substrate portion 30. In other words, the area of ​​the substrate portion 30 can be reduced or the capacitance of the resonant capacitors can be increased.

[0052] (Third embodiment)

[0053] Next, a third embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and their descriptions will be simplified or omitted.

[0054] Figure 6 It is a plan view of the resonant capacitor module 10 according to the third embodiment. Figure 7 It is a cross-sectional view of a resonant capacitor module 10 according to the third embodiment.

[0055] As shown in these drawings, in the third embodiment, a first substrate portion 30A and a second substrate portion 30B are provided as the substrate portion 30 .

[0056] The first substrate portion 30A includes a first conductor portion 31A having a first resonant capacitor group 32A mounted thereon; a second conductor portion 31B having a second resonant capacitor group 32B mounted thereon, which is disposed adjacent to the first conductor portion 31A and allows current to flow in a direction opposite to that of the first conductor portion 31A; and a third conductor portion 31C electrically connecting the first conductor portion 31A and the second conductor portion 31B.

[0057] In the first substrate portion 30A, the first conductor portion 31A extends in the X-axis direction. The +X-side end of the first conductor portion 31A is electrically connected to the one end portion 21 of the coil portion 20 via the contact member 61. In the first substrate portion 30A, the second conductor portion 31B is arranged adjacent to the first conductor portion 31A in the Y-axis direction and extends in the X-axis direction parallel to the first conductor portion 31A.

[0058] The third conductor portion 31C extends in the Y-axis direction and electrically connects the -X side end of the first conductor portion 31A to the -X side end of the second conductor portion 31B. That is, the conductor pattern of the first substrate portion 30A is formed in a U-shape (roughly U-shaped) when viewed from above. Figure 7 As shown, the +X-side end portion of the second conductor portion 31B is electrically connected to the first switch portion 41 disposed below the first substrate portion 30A via the contact member 63 .

[0059] like Figure 6 As shown, the second substrate portion 30B has a symmetrical structure with the first substrate portion 30A. The second substrate portion 30B includes a first conductor portion 31A, which is mounted with a first resonant capacitor group 32A; a second conductor portion 31B, which is mounted with a second resonant capacitor group 32B and is located adjacent to the first conductor portion 31A and allows current to flow in the opposite direction to the first conductor portion 31A; and a third conductor portion 31C, which electrically connects the first conductor portion 31A and the second conductor portion 31B.

[0060] In the second substrate portion 30B, the first conductor portion 31A extends in the X-axis direction. The -X-side end of the first conductor portion 31A is electrically connected to the other end portion 22 of the coil portion 20 via the contact member 62. In the second substrate portion 30B, the second conductor portion 31B is arranged adjacent to the first conductor portion 31A in the Y-axis direction and extends in the X-axis direction parallel to the first conductor portion 31A.

[0061] The third conductor portion 31C extends in the Y-axis direction and electrically connects the +X-side end of the first conductor portion 31A to the +X-side end of the second conductor portion 31B. That is, the conductor pattern of the second substrate portion 30B is formed in a U-shape (roughly U-shaped) when viewed from above. Figure 7 As shown, the −X side end portion of the second conductor portion 31B is electrically connected to the second switch portion 42 disposed below the second substrate portion 30B via the contact member 64 .

[0062] According to the above configuration, in each of the first substrate portion 30A and the second substrate portion 30B, the first conductor portion 31A and the second conductor portion 31B are adjacent to each other and currents flow in opposite directions. Therefore, the magnetic field generated by the first conductor portion 31A and the magnetic field generated by the second conductor portion 31B cancel each other out, thereby suppressing magnetic radiation from the resonant capacitor module 10.

[0063] As a modification of the third embodiment, even with a single substrate 30, by forming the conductor pattern into a U-shape, it is possible to suppress magnetic radiation from the resonant capacitor module 10. Figure 3 As shown, it is not necessary to arrange the resonant capacitor on both sides of the coil portion 20 , and the resonant capacitor can be arranged on one side of the coil portion 20 .

[0064] (Fourth embodiment)

[0065] Next, a fourth embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and their descriptions will be simplified or omitted.

[0066] Figure 8 1 is a schematic configuration diagram of a contactless power transmission system 100 according to a fourth embodiment.

[0067] like Figure 8 As shown, the contactless power transmission system 100 includes a power receiving device 8 including the above-described resonant capacitor module 10 , and a power supply device 9 that supplies power to the power receiving device 8 .

[0068] A power receiving device 8 is provided on a vehicle 1. The vehicle 1 is, for example, an electric vehicle and includes a travel motor 2. The driving force of the travel motor 2 is transmitted to the left and right drive wheels 4, 4 via gears (not shown). The travel motor 2 is, for example, a DC brushless motor and is electrically connected to a power storage device 6 via a control device (not shown).

[0069] Power storage device 6 is located under the rear seat, near the floor, and is electrically connected to a contactless charging power receiving device 8. Power receiving device 8 is mounted under the floor, such as on the underside of the floor, and converts AC power received, for example, through magnetic field resonance, into DC power to charge power storage device 6.

[0070] Power supply device 9 is installed in a parking lot, etc., and charges power storage device 6 through contactless charging. The coil portion of power supply device 9 is, for example, embedded in the ground (pavement) of the parking area. When AC current flows through the coil portion of power supply device 9 with power receiving device 8 and power supply device 9 facing each other, the AC current flows through coil portion 20 of power receiving device 8, charging power storage device 6.

[0071] According to the contactless power transmission system 100 and the vehicle 1 having the above-described configuration, since the resonant capacitor module 10 is provided, magnetic radiation that may become a source of electromagnetic interference can be suppressed.

[0072] While preferred embodiments of the present invention have been described and illustrated above, it should be understood that these are merely illustrative embodiments of the present invention and should not be considered limiting. Additions, omissions, substitutions, and other modifications may be made without departing from the scope of the present invention. Therefore, the present invention should not be considered limited by the foregoing description, but rather by the technical solutions.

Claims

1. A resonant capacitor module, wherein: The resonant capacitor module comprises: Coil section; a substrate portion electrically connected to the coil portion; and a power conversion unit electrically connected to the substrate unit, The substrate portion comprises: a first conductor portion having a first resonant capacitor group mounted thereon; as well as The second conductor portion has a second resonant capacitor group mounted thereon. The second conductor portion is disposed adjacent to the first conductor portion and has current flowing in a direction opposite to that of the first conductor portion.

2. The resonant capacitor module according to claim 1, wherein The coil portion includes: an end portion electrically connected to the first conductor portion; and The other end portion is arranged adjacent to the one end portion, extends parallel to the one end portion, and is electrically connected to the second conductor portion.

3. The resonant capacitor module according to claim 1 or 2, wherein: The power conversion unit includes: a first switch portion electrically connected to the first conductor portion; and The second switch portion is arranged adjacent to the first switch portion and is electrically connected to the second conductor portion.

4. The resonant capacitor module according to claim 1 or 2, wherein: The first conductor portion including the first resonant capacitor group and the second conductor portion including the second resonant capacitor group are provided on both surfaces of the substrate portion.

5. The resonant capacitor module according to claim 1, wherein The substrate portion includes a third conductor portion that electrically connects the first conductor portion and the second conductor portion.

6. The resonant capacitor module according to claim 5, wherein: The substrate portion includes a first substrate portion and a second substrate portion. The first substrate portion is electrically connected to one end portion of the coil portion and includes the first conductor portion, the second conductor portion, and the third conductor portion. The second substrate portion is electrically connected to the other end portion of the coil portion, and includes the first conductor portion, the second conductor portion, and the third conductor portion.

7. A contactless power transmission system, wherein: The contactless power transmission system includes the resonant capacitor module according to claim 1 or 2.

8. A vehicle, wherein: The vehicle includes the resonant capacitor module according to claim 1 or 2.

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