Resonant capacitor modules, contactless power transmission systems, and vehicles

Abstract

To provide a resonant capacitor module, a contactless power transfer system, and a vehicle that can suppress magnetic radiation, thereby contributing to energy efficiency.SOLUTION: A resonant capacitor module includes a coil portion, a substrate portion electrically connected to the coil portion, and a power conversion portion electrically connected to the substrate portion, and the substrate portion includes a first conductor portion on which a first group of resonant capacitors is mounted, and a second conductor portion on which a second group of resonant capacitors is mounted, the second conductor portion is positioned adjacent to the first conductor portion and through which current flows in the opposite direction to that of the first conductor portion.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a resonant capacitor module, a non-contact power transmission system, and a vehicle.

Background Art

[0002] In recent years, in order to enable more people to access energy that is affordable, reliable, sustainable, and advanced, research and development have been conducted on secondary batteries that contribute to energy efficiency. Patent Document 1 below discloses a wireless power transmission system that charges a battery (secondary battery) mounted on an electric vehicle such as an electric car. This wireless power transmission system includes two resonators that perform wireless power transmission using the magnetic field resonance method, and each resonator includes a resonance circuit including a coil and a capacitor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above resonator, since it handles high-voltage and high-frequency power, magnetic radiation that can be an electromagnetic interference source has become a problem.

[0005] The present application aims to provide a resonant capacitor module, a non-contact power transmission system, and a vehicle that can suppress magnetic radiation in order to solve the above problems. And by extension, it contributes to energy efficiency.

Means for Solving the Problems

[0006] The resonant capacitor module, contactless power transmission system, and vehicle according to this invention employ the following configuration. (1) A resonant capacitor module according to one aspect 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 group of resonant capacitors is mounted, and a second conductor portion on which a second group of resonant capacitors is mounted, is arranged adjacent to the first conductor portion, and current flows in the opposite direction to the first conductor portion.

[0007] (2) In the embodiment of (1) above, the coil portion may include one end electrically connected to the first conductor portion and another end that is positioned adjacent to the one end and extends parallel to the one end, and is electrically connected to the second conductor portion.

[0008] (3) In the embodiment of (1) or (2) above, 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.

[0009] (4) In the embodiments of (1) to (3) above, 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 sides of the substrate portion.

[0010] (5) In the embodiment of (1) above, the substrate portion may include a third conductor portion that electrically connects the first conductor portion and the second conductor portion.

[0011] (6) In the embodiment of (5) above, the substrate portion may include a first substrate portion electrically connected to one end of the coil portion and including the first conductor portion, the second conductor portion and the third conductor portion, and a second substrate portion electrically connected to the other end of the coil portion and including the first conductor portion, the second conductor portion and the third conductor portion.

[0012] (7): A contactless power transmission system according to one aspect of the present invention comprises a resonant capacitor module according to the aspects of (1) to (6) described above.

[0013] (8): A vehicle according to one aspect of this invention is equipped with a resonant capacitor module according to the aspects of (1) to (6) described above. [Effects of the Invention]

[0014] According to the above embodiment, the first conductor section on which the first resonant capacitor group is mounted and the second conductor section on which the second resonant capacitor group is mounted are arranged adjacent to each other and current flows in opposite directions, so that the magnetic field generated in the first conductor section and the magnetic field generated in the second conductor section cancel each other out. Therefore, magnetic radiation from the resonant capacitor module can be suppressed. [Brief explanation of the drawing]

[0015] [Figure 1] This is a plan view of a resonant capacitor module according to the first embodiment. [Figure 2] This is a cross-sectional view of a resonant capacitor module according to the first embodiment. [Figure 3] This is a circuit diagram of a resonant capacitor module according to the first embodiment. [Figure 4] This diagram illustrates the operation of the resonant capacitor module according to the first embodiment. [Figure 5] This is a cross-sectional view of a resonant capacitor module according to the second embodiment. [Figure 6] This is a plan view of a resonant capacitor module according to the third embodiment. [Figure 7] This is a cross-sectional view of a resonant capacitor module according to the third embodiment. [Figure 8] This is a schematic diagram of the contactless power transmission system according to the fourth embodiment. [Modes for carrying out the invention]

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0017] (First Embodiment) FIG. 1 is a plan view of a resonant capacitor module 10 according to the first embodiment. FIG. 2 is a cross-sectional view of the resonant capacitor module 10 according to the first embodiment. FIG. 3 is a circuit diagram of the resonant capacitor module 10 according to the first embodiment. As shown in these figures, the resonant capacitor module 10 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.

[0018] In the following description, an XYZ orthogonal coordinate system may be set, and the positional relationship of each member may be described while referring 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 horizontal direction and the second horizontal direction.

[0019] As shown in FIG. 2, the substrate portion 30 and the power conversion portion 40 are housed inside a metal case 50. The metal case 50 includes a bottom case 51 and an upper cover 52. The bottom case 51 is formed in a bottomed box shape with an open upper portion. The upper cover 52 is formed in a flat plate shape for closing the upper opening of the bottom case 51, and is screwed to the upper opening edge of the bottom case 51.

[0020] The power conversion portion 40 is disposed at the bottom of the bottom case 51. A heat dissipation structure 53 is attached to the lower surface of the power conversion portion 40. A plurality of heat dissipation fins protruding outside the metal case 50 are formed on the heat dissipation structure 53. The heat dissipation structure 53 is screwed to the bottom opening of the bottom case 51.

[0021] The substrate portion 30 is supported horizontally inside the metal case 50. The substrate portion 30 is attached to a base provided at the bottom of the bottom case 51. The substrate portion 30 is, for example, a printed circuit board and has a substantially rectangular shape extending in the X-axis direction. As shown in Figure 1, a first conductor portion 31A and a second conductor portion 31B are formed on the upper surface 30a of the substrate portion 30.

[0022] The first conductor section 31A is a conductor pattern extending in the X-axis direction, on which the first resonant capacitor group 32A is mounted. Specifically, the first conductor section 31A has a first portion electrically connected to the coil section 20 at its +X end, a second portion connected to the power conversion section 40 at its -X end, and a third portion connecting the first and second portions.

[0023] The third section consists of multiple conductor patterns spaced apart in the Y-axis direction and extending parallel to the X-axis direction, with multiple resonant capacitors (first resonant capacitor group 32A) mounted on each of these conductor patterns. The first and second sections act as busbars that distribute power to the first resonant capacitor group 32A.

[0024] The second conductor section 31B is positioned adjacent to the first conductor section 31A in the Y-axis direction and extends parallel to the first conductor section 31A in the X-axis direction. The second conductor section 31B is a conductor pattern extending in the X-axis direction, on which the second resonant capacitor group 32B is mounted. Specifically, the second conductor section 31B has a first portion electrically connected to the coil section 20 at its +X end, a second portion connected to the power conversion section 40 at its -X end, and a third portion connecting the first and second portions.

[0025] The third section consists of multiple conductor patterns spaced apart in the Y-axis direction and extending parallel to the X-axis direction, with multiple resonant capacitors (second resonant capacitor group 32B) mounted on each of these conductor patterns. The first and second sections act as busbars that distribute power to the second resonant capacitor group 32B.

[0026] The coil section 20 comprises a winding body (not shown in Figures 1 and 2) and one end 21 and the other end 22 extending from the winding body. The one end 21 of the coil section 20 is electrically connected to the first portion on the +X side of the first conductor section 31A via a contact member 61. The other end 22 of the coil section 20 is electrically connected to the first portion on the +X side of the second conductor section 31B via a contact member 62.

[0027] One end 21 of the coil portion 20 extends in the Y-axis direction and is positioned on the lower surface 30b side of the substrate portion 30 (see Figure 2). The other end 22 of the coil portion 20 is also positioned on the lower surface 30b side of the substrate portion 30. As shown in Figure 1, the other end 22 of the coil portion 20 is positioned adjacent to the one end 21 in the X-axis direction and extends parallel to the one end 21 in the Y-axis direction. The contact members 61 and 62 are positioned offset in the X-axis direction.

[0028] The power conversion unit 40 includes a first switch unit 41 and a second switch unit 42. The first switch unit 41 is electrically connected to the second portion on the -X side of the first conductor unit 31A via a pair of contact members 63. The first switch unit 41 is equipped with a pair of DC connection terminals 41a.

[0029] The second switch section 42 is electrically connected to the second portion of the second conductor section 31B on the -X side via a pair of contact members 64. The second switch section 42 is equipped with a pair of DC connection terminals 42a. The second switch section 42 is positioned adjacent to the first switch section 41 in the Y-axis direction.

[0030] As shown in Figure 3, the first switch section 41 and the second switch section 42 are equipped with a switching element (power semiconductor) and a freewheeling diode on the upper arm and lower arm, respectively. The power conversion section 40 comprises the first switch section 41, the second switch section 42, and a smoothing capacitor 43, forming an inverter circuit that converts DC power to AC power. The power conversion section 40 may also form a converter circuit that converts AC power to DC power, or it may further include a switch section to form both an inverter circuit and a converter circuit.

[0031] When AC power is supplied from the power conversion unit 40 to the coil unit 20, current flows in opposite directions from one end 21 of the coil unit 20, the first conductor unit 31A, and the first switch unit 41, and from the other end 22 of the coil unit 20, the second conductor unit 31B, and the second switch unit 42, as shown in Figure 1. In Figure 1, current A1 flows from the -X side to the +X side of the first conductor unit 31A, and current A2 flows from the +X side to the -X side of the second conductor unit 31B. The directions of currents A1 and A2 alternate.

[0032] Figure 4 is a diagram illustrating the operation of the resonant capacitor module 10 according to the first embodiment. As shown in Figure 4, one end 21 of the coil section 20, the first conductor section 31A, and the first switch section 41 are positioned adjacent to the other end 22 of the coil section 20, the second conductor section 31B, and the second switch section 42, and current flows in opposite directions. As a result, the magnetic field generated at the one end 21 of the coil section 20, the first conductor section 31A, and the first switch section 41 cancels out the magnetic field generated at the other end 22 of the coil section 20, the second conductor section 31B, and the second switch section 42. Therefore, magnetic radiation from the resonant capacitor module 10 can be suppressed.

[0033] As described above, the resonant capacitor module 10 comprises a coil section 20, a substrate section 30 electrically connected to the coil section 20, and a power conversion section 40 electrically connected to the substrate section 30. The substrate section 30 comprises a first conductor section 31A on which the first resonant capacitor group 32A is mounted, and a second conductor section 31B on which the second resonant capacitor group 32B is mounted, is positioned adjacent to the first conductor section 31A, and current flows in the opposite direction to the first conductor section 31A. With this configuration, the magnetic field generated in the first conductor section 31A and the magnetic field generated in the second conductor section 31B cancel each other out, thereby suppressing magnetic radiation from the resonant capacitor module 10.

[0034] Furthermore, in this embodiment, the coil portion 20 includes one end 21 electrically connected to the first conductor portion 31A, and another end 22 positioned adjacent to the one end 21 and extending parallel to the one end 21, and electrically connected to the second conductor portion 31B. With this configuration, the magnetic field generated at the one end 21 of the coil portion 20 and the magnetic field generated at the other end 22 of the coil portion 20 cancel each other out, thereby suppressing magnetic radiation from the resonant capacitor module 10.

[0035] Furthermore, in this embodiment, the power conversion unit 40 includes a first switch unit 41 electrically connected to the first conductor unit 31A, and a second switch unit 42 arranged adjacent to the first switch unit 41 and electrically connected to the second conductor unit 31B. With this configuration, the magnetic field generated by the first switch unit 41 and the magnetic field generated by the second switch unit 42 cancel each other out, thereby suppressing magnetic radiation from the resonant capacitor module 10.

[0036] (Second Embodiment) Next, a second embodiment of the present invention will be described. In the following description, components identical or equivalent to those in the above-described embodiment will be denoted by the same reference numerals, and their descriptions will be simplified or omitted.

[0037] Figure 5 is a cross-sectional view of the resonant capacitor module 10 according to the second embodiment. As shown in Figure 5, in the second embodiment, the first conductor portion 31A including the second resonant capacitor group 32B, and the second conductor portion 31B including the second resonant capacitor group 32B are provided on both the upper surface 30a and the lower surface 30b of the substrate portion 30. With this configuration, it is possible to increase the integration density of multiple resonant capacitors on the substrate portion 30 while suppressing magnetic radiation. In other words, the area of ​​the substrate portion 30 can be reduced, or the capacitance of the resonant capacitors can be increased.

[0038] (Third embodiment) Next, a third embodiment of the present invention will be described. In the following description, components identical or equivalent to those in the above-described embodiments will be denoted by the same reference numerals, and their descriptions will be simplified or omitted.

[0039] Figure 6 is a plan view of the resonant capacitor module 10 according to the third embodiment. Figure 7 is a cross-sectional view of the resonant capacitor module 10 according to the third embodiment. As shown in these figures, in the third embodiment, the substrate portion 30 comprises a first substrate portion 30A and a second substrate portion 30B.

[0040] The first substrate section 30A includes a first conductor section 31A on which a first resonant capacitor group 32A is mounted, a second conductor section 31B on which a second resonant capacitor group 32B is mounted and which is arranged adjacent to the first conductor section 31A and through which current flows in the opposite direction to the first conductor section 31A, and a third conductor section 31C which electrically connects the first conductor section 31A and the second conductor section 31B.

[0041] In the first substrate portion 30A, the first conductor portion 31A extends in the X-axis direction. The +X side end of this first conductor portion 31A is electrically connected to one end 21 of the coil portion 20 via a contact member 61. In addition, 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.

[0042] The third conductor portion 31C extends in the Y-axis direction and electrically connects the -X end of the first conductor portion 31A to the -X end of the second conductor portion 31B. In other words, the conductor pattern of the first substrate portion 30A is formed in a U-shape (approximately U-shape) when viewed from above. The +X end of the second conductor portion 31B is electrically connected to the first switch portion 41, which is located below the first substrate portion 30A, via a contact member 63, as shown in Figure 7.

[0043] As shown in Figure 6, the second substrate section 30B has a symmetrical structure with respect to the first substrate section 30A. The second substrate section 30B includes a first conductor section 31A on which the first resonant capacitor group 32A is mounted, a second conductor section 31B on which the second resonant capacitor group 32B is mounted, which is positioned adjacent to the first conductor section 31A and through which current flows in the opposite direction to the first conductor section 31A, and a third conductor section 31C which electrically connects the first conductor section 31A and the second conductor section 31B.

[0044] In the second substrate portion 30B, the first conductor portion 31A extends in the X-axis direction. The -X end of this first conductor portion 31A is electrically connected to the other end 22 of the coil portion 20 via a contact member 62. Also 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.

[0045] 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. In other words, the conductor pattern of the second substrate portion 30B is formed in a U-shape (approximately U-shape) when viewed from above. The -X side end of the second conductor portion 31B is electrically connected to the second switch portion 42, which is located below the second substrate portion 30B, via a contact member 64, as shown in Figure 7.

[0046] With the above configuration, in the first substrate section 30A and the second substrate section 30B, the first conductor section 31A and the second conductor section 31B are adjacent to each other and current flows in opposite directions. As a result, the magnetic field generated in the first conductor section 31A and the magnetic field generated in the second conductor section 31B cancel each other out, and magnetic radiation from the resonant capacitor module 10 can be suppressed.

[0047] As a modification of the third embodiment, even with a single substrate portion 30, magnetic radiation from the resonant capacitor module 10 can be suppressed by forming a conductor pattern in the same U-shape. As a result, as shown in Figure 3, it is not necessary to place resonant capacitors on both sides of the coil portion 20, and the resonant capacitor can be placed on one side of the coil portion 20.

[0048] (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. In the following description, components identical or equivalent to those in the above-described embodiments will be denoted by the same reference numerals, and their descriptions will be simplified or omitted.

[0049] Figure 8 is a schematic diagram of the contactless power transmission system 100 according to the fourth embodiment. As shown in Figure 8, the non-contact power transmission system 100 includes a power receiving device 8 equipped with the resonant capacitor module 10, and a power supply device 9 that supplies power to the power receiving device 8.

[0050] The power receiving device 8 is installed in the vehicle 1. The vehicle 1 is, for example, an electric vehicle and is equipped with a drive motor 2. The driving force of the drive motor 2 is transmitted to the left and right drive wheels 4, 4 via gears (not shown). The drive motor 2 is, for example, a DC brushless motor and is electrically connected to the power storage device 6 via a control device (not shown).

[0051] The energy storage device 6 is located under the rear seats or near the floor panel and is electrically connected to the power receiving device 8, which performs contactless charging. The power receiving device 8 is mounted under the floor, such as on the underside of the floor panel, and converts the received AC power into DC power, for example, by a magnetic resonance method, to charge the energy storage device 6.

[0052] The power supply device 9 is installed in a parking lot or similar location and charges the energy storage device 6 by contactless charging. The coil section of the power supply device 9 is embedded, for example, in the ground (road surface) of the parking area. When the power receiving device 8 and the power supply device 9 are positioned opposite each other, and an alternating current is passed through the coil section of the power supply device 9, an alternating current flows through the coil section 20 of the power receiving device 8, and the energy storage device 6 can be charged. According to the non-contact power transmission system 100 and vehicle 1 with the above configuration, since the resonant capacitor module 10 is included, magnetic radiation that could be a source of electromagnetic interference can be suppressed.

[0053] While preferred embodiments of the present invention have been described and explained above, it should be understood that these are illustrative and should not be considered limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the invention. Therefore, the present invention should not be considered limited by the foregoing description, but rather limited by the claims. [Explanation of Symbols]

[0054] 1 vehicle 2. Travel motor 4 drive wheels 6. Energy storage device 8 Power receiving device 9 Power supply device 10 Resonant Capacitor Modules 20 Coil section 21 One end 22 Other end 30 Circuit board section 30a top surface 30A First substrate section 30b Bottom side 30B 2nd board part 31A First Conductor Section 31B Second Conductor Section 31C Third Conductor Section 32A First resonant capacitor group 32B Second resonant capacitor group 40 Power Conversion Unit 41. First switch section 41a DC connection terminal 42 Second Switch Section 42a DC connection terminal 43 Smoothing Capacitor 50 Metal Cases 51 Bottom Case 52 Upper cover 53 Heat dissipation structure 61 Contact Member 62 Contact Member 63 Contact Member 64 Contact Member 100 Contactless Power Transmission Systems A1 current A2 current

Claims

1. The coil section, The coil portion and the substrate portion are electrically connected, The circuit board portion comprises a power conversion unit electrically connected to the circuit board portion, The aforementioned substrate portion is The first conductor section on which the first group of resonant capacitors is mounted, A second group of resonant capacitors is mounted, and the second conductor is positioned adjacent to the first conductor and through which current flows in the opposite direction to the first conductor. Resonant capacitor module.

2. The aforementioned coil section is One end electrically connected to the first conductor portion, It comprises an end portion which is positioned adjacent to the aforementioned end portion and extends parallel to the aforementioned end portion, and is electrically connected to the second conductor portion, The resonant capacitor module according to claim 1.

3. The power conversion unit is The first conductor portion is electrically connected to the first switch portion, The device comprises a second switch section, which is arranged adjacent to the first switch section and electrically connected to the second conductor section, The resonant capacitor module according to claim 1 or 2.

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

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

6. The aforementioned substrate portion is, One end of the coil portion is electrically connected to the first substrate portion which includes the first conductor portion, the second conductor portion, and the third conductor portion, The second substrate portion includes a first conductor portion that is electrically connected to the other end of the coil portion and is different from the first conductor portion included in the first substrate portion, a second conductor portion that is different from the second conductor portion included in the first substrate portion, and a third conductor portion that is different from the third conductor portion included in the first substrate portion. The resonant capacitor module according to claim 5.

7. A contactless power transmission system comprising the resonant capacitor module according to claim 1 or 2.

8. A vehicle comprising the resonant capacitor module according to claim 1 or 2.

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