JP5682446B2 - Secondary coil unit and power transmission system - Google Patents

Description

  The present invention relates to a secondary coil unit and a power transmission system.

  In recent years, attention has been focused on hybrid vehicles, electric vehicles, and the like that drive wheels using electric power such as a battery in consideration of the environment.

  Particularly in recent years, attention has been focused on wireless charging capable of charging a battery in a non-contact manner without using a plug or the like in an electric vehicle equipped with the battery as described above.

  For example, JP 2010-268660 A (Patent Document 1), JP 2010-284011 A (Patent Document 2), and International Publication No. 2010/041321 (Patent Document 3) utilize electromagnetic resonance. A non-contact power transmission system that transmits and receives power is disclosed.

JP 2010-268660 A JP 2010-284011 A International Publication No. 2010/041321

  In power transmission and reception using the contactless power transmission system described above, a primary coil unit on the power transmission side and a secondary coil unit on the power reception side are used. Moreover, it is preferable that the space for installing or mounting each coil unit is small. In particular, it can be said that the coil unit mounted on the vehicle side is preferably smaller because the mounting space is limited.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a secondary coil unit and a power transmission system that can reduce the space for installation or mounting. There is.

  In the secondary coil unit according to the present invention, a secondary resonance coil that is disposed at an interval from the primary resonance coil provided outside and performs electromagnetic resonance coupling with the primary resonance coil, and the secondary resonance coil A capacitor connected to the secondary resonance coil, an electromagnetic induction coil that performs electromagnetic induction coupling with the secondary resonance coil, a rectifier connected to the electromagnetic induction coil, the secondary resonance coil, the capacitor, the electromagnetic induction coil, and the rectifier And a housing that accommodates.

  The housing includes a refrigerant path for passing a refrigerant that cools the secondary resonance coil, the capacitor, the electromagnetic induction coil, and the rectifier, and the rectifier is connected to the capacitor when viewed from the direction of the refrigerant flow. It is arranged downstream.

  Preferably, the refrigerant passage includes the rectifier and the capacitor, the first refrigerant passage through which the refrigerant that cools the rectifier and the capacitor passes, the secondary resonance coil, and the electromagnetic induction coil. A secondary resonance coil and a second refrigerant passage through which a refrigerant for cooling the electromagnetic induction coil passes.

  Preferably, the casing has a cylindrical bobbin, the capacitor and the rectifier are arranged on an inner peripheral surface side of the bobbin, and the secondary resonance coil and the electromagnetic induction coil are arranged on an outer periphery of the bobbin. The first refrigerant passage is provided on the inner peripheral surface side of the bobbin, and the second refrigerant passage is provided on the outer peripheral surface side of the bobbin.

  Preferably, the secondary resonance coil and the electromagnetic induction coil are arranged on the downstream side of the rectifier as viewed from the direction of the refrigerant flow.

  Preferably, the housing has a cylindrical bobbin, the secondary resonance coil and the electromagnetic induction coil are mounted on an outer peripheral surface of the bobbin, and the capacitor and the rectifier are connected to an inner peripheral surface of the bobbin. The bobbin has a through hole in its side wall, and the refrigerant introduced to the inner peripheral surface side of the bobbin is sent out to the outer peripheral side of the bobbin through the through hole as the refrigerant passage. Is formed.

  Preferably, the rectifier includes a device and a rectifier housing that accommodates the device and has a ventilation hole, and the rectifier is disposed in the refrigerant passage so that the ventilation hole faces in the direction of the refrigerant flow. A housing is arranged.

  In the power transmission system according to the present invention, the secondary coil unit according to any one of the above and the secondary resonance coil are disposed at a distance from each other, and electromagnetic resonance coupling is performed with the secondary resonance coil. A primary coil unit including a primary resonance coil.

  According to the secondary coil unit and the power transmission system of the present invention, it is possible to reduce the space for installation or mounting.

It is a figure which shows typically the electric power transmission system containing the electric vehicle in Embodiment 1, the external electric power feeder which supplies electric power to an electric vehicle, and an electric vehicle and an external electric power feeder. It is a schematic diagram for demonstrating the principle of power transmission and power reception by a resonance method. It is the figure which showed the relationship between the distance from an electric current source (magnetic current source), and the intensity | strength of an electromagnetic field. FIG. 3 is a longitudinal sectional view showing the structure of the vehicle side coil unit in the first embodiment. It is a cross-sectional view along the VV arrow cross section in FIG. It is a perspective view which shows schematic structure of a rectifier. FIG. 5 is a longitudinal sectional view showing a structure of a vehicle side coil unit in a second embodiment. It is a cross-sectional view along the VIII-VIII arrow line cross section in FIG. FIG. 10 is a transverse sectional view showing the structure of the secondary coil unit in the third embodiment. It is the figure seen from the arrow X direction in FIG. It is a cross-sectional view along the XI-XI line arrow cross section in FIG.

  The secondary coil unit and the power transmission system according to the present invention will be described below with reference to the drawings. In each embodiment described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. The same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated. In addition, it is planned from the beginning to use the structures in the embodiments in appropriate combinations.

(Embodiment 1)
A vehicle according to the first embodiment, an external power feeding device, and a power transmission system including the vehicle and the external power feeding device will be described with reference to FIGS. 1 to 6.

  FIG. 1 is a diagram schematically illustrating an electric power transmission system including an electric vehicle 10 and an external power supply device 20.

  The power transmission system according to the present embodiment includes an electric vehicle 10 and an external power feeding device 20. The electric vehicle 10 stops at a predetermined position of the parking space 42 where the external power feeding device 20 is provided, and mainly receives power from the external power feeding device 20. The electric vehicle 10 can also supply power to the external power supply device 20.

  The parking space 42 is provided with a wheel stop and a line so that the electric vehicle 10 stops at a predetermined position.

  The external power supply device 20 includes a high-frequency power driver 22 connected to an AC power source 21, a control unit 26 that controls driving of the high-frequency power driver 22, and a facility-side coil unit 41 connected to the high-frequency power driver 22. Including. The equipment-side coil unit 41 mainly functions as a non-contact power transmission device, and the equipment-side coil unit 41 includes the equipment-side resonance coil 24, the equipment-side capacitor 25 connected to the equipment-side resonance coil 24, and the equipment side. A facility-side electromagnetic induction coil 23 that is electrically connected to the resonance coil 24 is included.

  AC power supply 21 is a power supply external to the vehicle, for example, a system power supply. The high frequency power driver 22 converts power received from the AC power source 21 into high frequency power, and supplies the converted high frequency power to the facility-side electromagnetic induction coil 23. Note that the frequency of the high-frequency power generated by the high-frequency power driver 22 is, for example, 1 M to several tens of MHz.

  By supplying the high-frequency power to the facility-side electromagnetic induction coil 23, the amount of magnetic flux generated from the facility-side electromagnetic induction coil 23 changes with time.

  The facility-side resonance coil 24 is electromagnetically coupled to the facility-side electromagnetic induction coil 23. When the amount of magnetic flux from the facility-side resonance coil 24 changes, a high-frequency current is also supplied to the facility-side resonance coil 24 by electromagnetic induction. Flowing.

  At this time, the facility-side electromagnetic induction coil is set so that the frequency of the high-frequency current flowing through the facility-side resonance coil 24 substantially matches the resonance frequency determined by the reluctance of the facility-side electromagnetic induction coil 23 and the capacity of the facility-side capacitor 25. 23 is supplied with current. The equipment side resonance coil 24 and the equipment side capacitor 25 function as a series LC resonator.

  An electric field and a magnetic field having substantially the same frequency as the resonance frequency are formed around the equipment-side resonance coil 24. In this manner, an electromagnetic field (electromagnetic field) having a predetermined frequency is formed around the equipment-side resonance coil 24.

  The electric vehicle 10 includes a series LC resonator having the same resonance frequency as the series LC resonator formed by the equipment-side resonance coil 24 and the equipment-side capacitor 25, and the LC resonator and the equipment-side resonance coil. 24 and the LC resonator formed by the facility-side capacitor 25 are electromagnetically resonantly coupled, so that electric power is transmitted from the external power feeding device 20 to the electric vehicle 10.

  In addition, the electric vehicle 10 and the external power supply device 20 mainly use a near field (evanescent field) out of an electromagnetic field formed by the equipment-side resonance coil 24 and the equipment-side capacitor 25 from the external power supply device 20 side. Electric power is supplied to the electric vehicle 10. The details of the wireless power transmission / reception method using the electromagnetic resonance method will be described later.

  The electric vehicle 10 includes a vehicle side coil unit 40 that mainly functions as a non-contact power receiving device, a DC / DC converter 14 connected to the vehicle side coil unit 40, and a battery 15 connected to the DC / DC converter 14. A power control unit (PCU (Power Control Unit)) 16, a motor unit 17 connected to the power control unit 16, a DC / DC converter 14 and a power control unit 16 and the like. Control Unit) 18. Note that the DC / DC converter 14 may be omitted.

  Electric vehicle 10 according to the present embodiment is a hybrid vehicle including an engine (not shown), but the present invention can be applied to an electric vehicle and a fuel cell vehicle as long as the vehicle is driven by a motor. it can.

  The vehicle side coil unit 40 includes a vehicle side resonance coil 11, a vehicle side capacitor 19 connected to the vehicle side resonance coil 11, a vehicle side electromagnetic induction coil 12 coupled to the vehicle side resonance coil 11 by electromagnetic induction, And a rectifier 13 connected to the side electromagnetic induction coil 12. The detailed configuration of the vehicle side coil unit 40 will be described later.

  The vehicle-side resonance coil 11 and the vehicle-side capacitor 19 constitute a series LC resonator. The resonance frequency of the series LC resonator formed by the vehicle-side resonance coil 11 and the vehicle-side capacitor 19 and the equipment-side resonance coil 24. The resonance frequency of the series LC resonator formed by the facility-side capacitor 25 substantially matches the resonance frequency.

  Here, when a high-frequency current having the same frequency as the resonance frequency of the LC resonator is supplied to the facility-side resonance coil 24, an electromagnetic field (electromagnetic field) having the resonance frequency is generated.

  And if the vehicle side resonance coil 11 is arrange | positioned from the equipment side resonance coil 24, for example in the range of about several m or less, LC resonator formed by the vehicle side resonance coil 11 and the vehicle side capacitor 19 will resonate. Thus, a current flows through the vehicle-side resonance coil 11. Thus, the vehicle-side resonance coil 11 and the facility-side resonance coil 24 are electromagnetically resonantly coupled.

  The vehicle-side electromagnetic induction coil 12 is electromagnetically coupled to the vehicle-side resonance coil 11 and takes out the electric power received by the vehicle-side resonance coil 11. When the vehicle-side electromagnetic induction coil 12 sequentially extracts power from the vehicle-side resonance coil 11, power is sequentially supplied from the equipment-side resonance coil 24 to the vehicle-side resonance coil 11 via the electromagnetic field. Thus, the vehicle-side coil unit 40 and the facility-side coil unit 41 employ a so-called electromagnetic resonance wireless transmission / reception system.

  The rectifier 13 is connected to the vehicle-side electromagnetic induction coil 12, converts an alternating current supplied from the vehicle-side electromagnetic induction coil 12 into a direct current, and supplies the direct current to the DC / DC converter 14.

  The DC / DC converter 14 adjusts the voltage of the direct current supplied from the rectifier 13 and supplies it to the battery 15.

  The power control unit 16 includes a converter connected to the battery 15 and an inverter connected to the converter, and the converter adjusts (boosts) a direct current supplied from the battery 15 and supplies it to the inverter. The inverter converts the direct current supplied from the converter into an alternating current and supplies it to the motor unit 17.

  The motor unit 17 employs, for example, a three-phase AC motor and is driven by an AC current supplied from an inverter of the power control unit 16.

  When the electric vehicle 10 is a hybrid vehicle, the electric vehicle 10 further includes an engine and a power split mechanism, and the motor unit 17 mainly functions as a motor generator that functions mainly as a generator and an electric motor. Including a motor generator.

  As described above, between the vehicle side coil unit 40 and the facility side coil unit 41 according to the first embodiment is a wireless power transmission / reception system, and a resonance method using an electromagnetic field is employed.

  FIG. 2 is a schematic diagram for explaining the principle of power transmission and power reception by the resonance method. The principle of power transmission and power reception by the resonance method will be described with reference to FIG.

  Referring to FIG. 2, in this resonance method, in the same way as two tuning forks resonate, two LC resonance coils having the same natural frequency resonate in an electromagnetic field (near field), and thereby, from one coil. Electric power is transmitted to the other coil via an electromagnetic field.

  Specifically, the primary coil 32 is connected to the high-frequency power source 31, and high-frequency power of 1 M to several tens of MHz is supplied to the primary resonance coil 33 that is magnetically coupled to the primary coil 32 by electromagnetic induction. The primary resonance coil 33 is an LC resonator based on the inductance of the coil itself and stray capacitance (including the capacitance of the capacitor when a capacitor is connected to the coil), and has the same resonance frequency as the primary resonance coil 33. Resonates with the next resonance coil 34 via an electromagnetic field (near field).

  Then, energy (electric power) moves from the primary resonance coil 33 to the secondary resonance coil 34 via the electromagnetic field. The energy (electric power) moved to the secondary resonance coil 34 is taken out by the secondary coil 35 magnetically coupled to the secondary resonance coil 34 by electromagnetic induction and supplied to the load 36. The power transmission by the resonance method is realized when the Q value indicating the resonance intensity between the primary resonance coil 33 and the secondary resonance coil 34 is larger than 10, for example.

  2 and the configuration shown in FIG. 1, the AC power supply 21 and the high-frequency power driver 22 shown in FIG. 1 correspond to the high-frequency power supply 31 shown in FIG. The facility-side electromagnetic induction coil 23 shown in FIG. 1 corresponds to the primary coil 32 of FIG. Further, the facility-side resonance coil 24 and the facility-side capacitor 25 shown in FIG. 1 correspond to the stray capacitance of the primary resonance coil 33 and the primary resonance coil 33 in FIG.

  The vehicle-side resonance coil 11 and the vehicle-side capacitor 19 shown in FIG. 1 correspond to the stray capacitance of the secondary resonance coil 34 and the secondary resonance coil 34 shown in FIG.

  The vehicle-side electromagnetic induction coil 12 shown in FIG. 1 corresponds to the secondary coil 35 of FIG. The rectifier 13, the DC / DC converter 14 and the battery 15 shown in FIG. 1 correspond to the load 36 shown in FIG.

  Furthermore, the wireless power transmission / reception system according to the first embodiment uses a near field (evanescent field) in which the “electrostatic field” of the electromagnetic field is dominant to improve power transmission and power reception efficiency.

  FIG. 3 is a diagram showing the relationship between the distance from the current source (magnetic current source) and the intensity of the electromagnetic field. Referring to FIG. 3, the electromagnetic field is composed of three components. A curve k1 is a component inversely proportional to the distance from the wave source, and is referred to as a “radiating electric field”. A curve k2 is a component inversely proportional to the square of the distance from the wave source, and is referred to as an “induced electric field”. The curve k3 is a component that is inversely proportional to the cube of the distance from the wave source, and is referred to as an “electrostatic field”.

  The “electrostatic field” is a region where the intensity of the electromagnetic wave suddenly decreases with the distance from the wave source. In the resonance method, energy (electric power) is utilized using the near field (evanescent field) in which this “electrostatic field” is dominant. Is transmitted. That is, by resonating a pair of resonators having the same natural frequency (for example, a pair of LC resonance coils) in a near field where the “electrostatic field” is dominant, the resonance from one resonator (primary resonance coil) to the other Energy (electric power) is transmitted to the resonator (secondary resonance coil). Since this “electrostatic field” does not propagate energy far away, the resonance method can transmit power with less energy loss than electromagnetic waves that transmit energy (electric power) by “radiant electric field” that propagates energy far away. it can.

  As described above, the electric vehicle 10 according to the first embodiment and the external power supply device 20 use the resonance of the near field of the electromagnetic field, and the equipment of the vehicle side coil unit 40 of the electric vehicle 10 and the external power supply device 20. Power is transmitted to and received from the side coil unit 41.

(Vehicle side coil unit 131A)
Next, the vehicle side coil unit 131A in the present embodiment will be described in detail with reference to FIGS. 4 is a longitudinal sectional view showing the structure of the vehicle side coil unit 131A, FIG. 5 is a transverse sectional view taken along the line VV in FIG. 4, and FIG. 6 is a schematic structure of the rectifier 13. FIG.

  This vehicle-side coil unit 131A corresponds to the vehicle-side coil unit 40 in FIG.

  Referring to FIGS. 4 and 5, this vehicle side coil unit 131 </ b> A is arranged with a space from equipment side (primary) resonance coil 24 (see FIG. 1) provided on the equipment side, and equipment side resonance coil 24. Vehicle-side (secondary) resonance coil 11 that performs electromagnetic resonance coupling with the vehicle-side capacitor 19 that is connected to the vehicle-side resonance coil 11, and vehicle-side electromagnetic induction coil that performs electromagnetic induction coupling with the vehicle-side resonance coil 11 12, a rectifier 13 connected to the vehicle-side electromagnetic induction coil 12, a vehicle-side resonance coil 11, a vehicle-side capacitor 19, a vehicle-side electromagnetic induction coil 12, and a housing case 132 that houses the rectifier 13. Yes.

  The housing case 132 houses the vehicle-side resonance coil 11, the vehicle-side capacitor 19, the vehicle-side electromagnetic induction coil 12, and the rectifier 13, and the vehicle-side resonance coil 11, the vehicle-side capacitor 19, the vehicle-side electromagnetic induction coil 12, and A first refrigerant path CR11 and a second refrigerant path CR12 for allowing the refrigerant that cools the rectifier 13 to pass therethrough are included. The housing case 132 is formed using a plate material in which a resin member and a shield member are combined. In addition, you may shape | mold using only a shield member.

  In the present embodiment, the housing case 132 has a hollow cylindrical bobbin 128. The rectifier 13 and the vehicle-side capacitor 19 are disposed on the inner peripheral surface side of the cylindrical bobbin 128, and a first refrigerant passage CR <b> 11 that allows the refrigerant that cools the rectifier 13 and the vehicle-side capacitor 19 to pass through the bobbin 128. Is provided.

  The vehicle-side resonance coil 11 and the vehicle-side electromagnetic induction coil 12 are attached to the outer peripheral surface of the bobbin 128. On the outer peripheral surface side of the bobbin 128, an annular second refrigerant passage CR12 through which refrigerant for cooling the vehicle-side resonance coil 11 and the vehicle-side electromagnetic induction coil 12 passes is provided.

  On one side of the housing case 132, an introduction pipe 133 for introducing refrigerant into the first refrigerant passage CR11 and the second refrigerant passage CR12 is provided. A blower 127 is disposed inside the introduction pipe 133. A discharge pipe 134 is provided on the opposite side of the housing housing 132 from the introduction pipe 133 with the bobbin 128 interposed therebetween.

  Further, the bobbin 128 is provided with an introduction port 135 on the side surface where the introduction tube 133 faces and a discharge port 136 on the side surface where the discharge tube 134 faces. In the present embodiment, the case where cooling air is used as the refrigerant is shown, and the flow of the cooling air is indicated by an arrow F in the drawing.

  A part of the cooling air from the introduction pipe 133 flows into the first refrigerant passage CR11 from the introduction port 135, and cools the rectifier 13 and the vehicle side capacitor 19.

  A part of the cooling air from the introduction pipe 133 flows along the outer peripheral surface of the bobbin 128 in the annular second refrigerant passage CR12 to cool the vehicle-side resonance coil 11 and the vehicle-side electromagnetic induction coil 12.

  The cooling air that has passed through the first refrigerant passage CR11 and the second refrigerant passage CR12 is discharged from the discharge pipe 134 to the outside of the housing case 132.

  Here, in the housing case 132 in the present embodiment, the vehicle-side capacitor 19 and the rectifier 13 are disposed inside the first refrigerant passage CR11. Conventionally, since the rectifier 13 is a device that is not housed inside the vehicle-side coil unit 131A, the rectifier 13 is disposed in the vacant space that has existed conventionally in the vehicle-side coil unit 131A on the vehicle side. This makes it possible to reduce the space for installation or mounting on the vehicle side.

  Here, the rectifier 13 is a device that generates heat. When the rectifier 13 is disposed inside the vehicle-side coil unit 131A, the internal temperature of the vehicle-side coil unit 131A increases. On the other hand, since the capacity of the vehicle-side capacitor 19 changes due to heat, attention should be paid to the internal temperature of the vehicle-side coil unit 131A, and the temperature of the vehicle-side capacitor 19 itself is preferably stable.

  Therefore, in the vehicle side coil unit 131A according to the present embodiment, the rectifier 13 is disposed on the downstream side of the vehicle side capacitor 19 in the first refrigerant passage CR11 as viewed from the flow direction of the cooling air. Thereby, since the ambient temperature around the vehicle side capacitor 19 can be stabilized, the temperature of the vehicle side capacitor 19 itself can be stabilized even when the rectifier 13 is disposed inside the vehicle side coil unit 131A. Can do.

  It is preferable that the rectifier 13 itself is also efficiently cooled. As shown in FIG. 6, the rectifier 13 includes a semiconductor element substrate 13b and a heat dissipation block 13c as devices accommodated in a rectifier housing 13a. The rectifier housing 13a has ventilation holes 13d and 13e for releasing heat from the heat dissipation block 13c to the rectifier housing 13a.

  Therefore, when the rectifier 13 is arranged inside the second refrigerant passage CR12, the rectifier housing 13a is arranged so that the ventilation holes 13d and 13e face each other in the direction of the cooling air flow, so that the inside of the rectifier 13 is arranged. Thus, the cooling air can be efficiently passed to improve the cooling efficiency.

  As described above, according to the vehicle side coil unit 131A in the present embodiment, since the rectifier 13 is disposed inside the housing case 132, it is possible to reduce the space for installation or mounting on the vehicle side. It becomes.

  Further, the rectifier 13 is disposed on the downstream side of the vehicle-side capacitor 19 in the first refrigerant passage CR11 as seen from the flow direction of the cooling air. Thus, the temperature of the vehicle-side capacitor 19 itself can be stabilized without being affected by the temperature rise of the rectifier 13, and the rectifier 13 can be cooled.

(Embodiment 2)
Next, with reference to FIGS. 7 and 8, the structure of vehicle-side coil unit 131B in the second embodiment will be described. 7 is a longitudinal sectional view showing the structure of the vehicle side coil unit 131B, and FIG. 8 is a transverse sectional view taken along the section VIII-VIII in FIG.

  The difference between the vehicle side coil unit 131B in the present embodiment and the vehicle side coil unit 131A in the first embodiment is in the structure of the refrigerant passage, and the other configurations are the same. Therefore, the same reference numerals are assigned to the same parts and corresponding parts, and duplicate description will not be repeated.

  The structure of the refrigerant passage of the vehicle side coil unit 131B in the present embodiment is provided with an introduction pipe 140 for introducing cooling air from the axial direction of the cylindrical bobbin 128 to the inner peripheral surface side of the bobbin 128. A blower 127 is disposed inside 140. In the present embodiment, the introduction pipe 140 is provided on the upper side of the bobbin 128, but the introduction pipe 140 may be provided on the lower side of the bobbin 128.

  A communication port 135a is provided on the side surface of the bobbin 128, which is substantially opposite to the position where the introduction pipe 140 is provided. As a result, a first refrigerant passage CR21 from the introduction pipe 140 toward the communication port 135a is formed inside the bobbin 128.

  Also in the first refrigerant passage CR21 formed in the bobbin 128, the rectifier 13 is disposed downstream of the vehicle-side capacitor 19 when viewed from the flow direction of the cooling air, as in the first embodiment. Yes.

  Further, as in the first embodiment, a second refrigerant passage CR22 through which refrigerant for cooling the annular vehicle-side resonance coil 11 and the vehicle-side electromagnetic induction coil 12 passes is provided on the outer peripheral surface side of the bobbin 128. When viewed from the cooling air flow, the first refrigerant passage CR21 to the second refrigerant passage CR22 constitute one refrigerant passage.

  In addition, a discharge pipe 134 communicating with the second refrigerant passage CR22 is provided in the housing case 132 located on the opposite side of the communication port 135a with the introduction pipe 140 interposed therebetween.

  As described above, even in the structure of the vehicle-side coil unit 131B in the present embodiment, the rectifier 13 is disposed inside the housing housing 132, so that the space for installation or mounting on the vehicle side is reduced. It becomes possible.

  Similarly to the first embodiment, the rectifier 13 is disposed on the downstream side of the vehicle-side capacitor 19 in the first refrigerant passage CR21 as seen from the flow direction of the cooling air. As a result, the temperature of the vehicle-side capacitor 19 itself can be stabilized without being affected by the temperature rise of the rectifier 13, and the rectifier 13 can be cooled.

(Embodiment 3)
Next, the structure of the vehicle side coil unit 131C in the third embodiment will be described with reference to FIGS. 9 is a cross-sectional view showing the structure of the vehicle side coil unit 131C in the present embodiment, FIG. 10 is a view seen from the direction of the arrow X in FIG. 9, and FIG. 11 is XI- in FIG. It is a cross-sectional view along the line XI.

  The difference between the vehicle side coil unit 131C in the present embodiment and the vehicle side coil unit 131A in the first embodiment is in the structure of the refrigerant passage. Therefore, the same reference numerals are assigned to the same parts and corresponding parts, and duplicate description will not be repeated.

  The structure of the refrigerant passage of the vehicle side coil unit 131C in the present embodiment is provided with an introduction pipe 133 that penetrates the bobbin 128 from the outside of the housing case 132 along the radial direction. A passage CR31 is formed. A blower 127 is disposed inside the first refrigerant passage CR31.

  In addition, a communication port 135 a that communicates with the first refrigerant passage CR 31 of the introduction pipe 133 is provided on the side surface of the bobbin 128. In the first embodiment, the inside of the cylindrical bobbin 128 constitutes the first refrigerant passage CR31. However, in this embodiment, the inside of the introduction pipe 133 penetrating the inside of the bobbin 128 is the first refrigerant. A passage CR31 is formed.

  The vehicle-side capacitor 19 and the rectifier 13 are disposed inside the first refrigerant passage CR31, and the rectifier 13 is arranged downstream of the vehicle-side capacitor 19 when viewed from the flow direction of the cooling air, as in the first and second embodiments. Arranged on the side.

  Further, similarly to the first embodiment, a second refrigerant passage CR32 through which refrigerant for cooling the annular vehicle-side resonance coil 11 and the vehicle-side electromagnetic induction coil 12 passes is provided on the outer peripheral surface side of the bobbin 128. When viewed from the cooling air flow, the first refrigerant passage CR31 to the second refrigerant passage CR32 constitute one refrigerant passage.

  Further, in the vicinity of the introduction pipe 133 on the outer peripheral surface of the housing case 132, two discharge pipes 134 communicating with the second refrigerant passage CR32 are provided at positions sandwiching the refrigerant introduction port of the introduction pipe 133 from both sides. .

  As described above, even in the structure of the vehicle-side coil unit 131C in the present embodiment, since the rectifier 13 is disposed inside the housing housing 132, the space for installation or mounting on the vehicle side is reduced. It becomes possible.

  As in the case of the first embodiment, the rectifier 13 is disposed on the downstream side of the vehicle-side capacitor 19 in the first refrigerant passage CR31 as seen from the flow direction of the cooling air. As a result, the temperature of the vehicle-side capacitor 19 itself can be stabilized without being affected by the temperature rise of the rectifier 13, and the rectifier 13 can be cooled.

  Moreover, although the said embodiment demonstrated the case where the coil unit which has an electromagnetic induction coil was employ | adopted for the vehicle side coil unit and the equipment side coil unit, it is a coil unit which does not have an electromagnetic induction coil. However, it is possible to apply the configuration of the present invention.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be applied to a secondary coil unit and a power transmission system.

  DESCRIPTION OF SYMBOLS 10 Electric vehicle, 11 Vehicle side resonance coil, 12 Vehicle side electromagnetic induction coil, 13 Rectifier, 13a Rectifier housing | casing, 13b Semiconductor element board | substrate, 13c Heat radiation block, 13d, 13e Ventilation hole, 14 Converter, 15 Battery, 16 Power control unit , 17 Motor unit, 19 Vehicle side capacitor, 20 External power supply device, 21 AC power source, 22 High frequency power driver, 23 Equipment side electromagnetic induction coil, 24 Equipment side resonance coil, 25 Equipment side capacitor, 26 Control unit, 31 High frequency power supply, 32 Primary coil, 33 Primary resonance coil, 34 Secondary resonance coil, 35 Secondary coil, 36 Load, 40, 131A, 131B, 131C Vehicle side coil unit, 41 Equipment side coil unit, 42 Parking space, 127 Blower, 128 Bobbin , 32 accommodation housing, 133,140 inlet tube, 134 exhaust pipe, 135 inlet, 135a communicating port, 136 outlet, CR11, CR21, CR31 first refrigerant passage, CR12, CR22, CR32 second refrigerant passage.

Claims (5)

A secondary resonance coil that is disposed at an interval from a primary resonance coil provided outside and performs electromagnetic resonance coupling with the primary resonance coil;
A capacitor connected to the secondary resonance coil;
An electromagnetic induction coil that performs electromagnetic induction coupling with the secondary resonance coil;
A rectifier connected to the electromagnetic induction coil;
A housing that houses the secondary resonance coil, the capacitor, the electromagnetic induction coil, and the rectifier,
The housing includes a refrigerant passage for allowing a refrigerant that cools the secondary resonance coil, the capacitor, the electromagnetic induction coil, and the rectifier to pass therethrough,
When viewed from the direction of the refrigerant flow, the rectifier is disposed downstream of the capacitor ,
The secondary resonance coil and the electromagnetic induction coil are disposed on the downstream side of the rectifier when viewed from the direction of the refrigerant flow,
The housing has a cylindrical bobbin,
The secondary resonance coil and the electromagnetic induction coil are mounted on an outer peripheral surface of the bobbin,
The capacitor and the rectifier are disposed on the inner peripheral surface side of the bobbin,
The bobbin has a through hole on its side wall,
A secondary coil unit in which a passage through which the refrigerant introduced to the inner peripheral surface side of the bobbin is sent to the outer peripheral side of the bobbin through the through hole is formed as the refrigerant passage . The refrigerant passage is
A first refrigerant passage through which a refrigerant for cooling the rectifier and the capacitor is passed;
2. The secondary coil unit according to claim 1 , wherein the secondary resonance coil and the electromagnetic induction coil are arranged, and the secondary coil unit includes a second refrigerant passage that allows a refrigerant that cools the secondary resonance coil and the electromagnetic induction coil to pass therethrough. The housing has a cylindrical bobbin,
The capacitor and the rectifier are disposed on the inner peripheral surface side of the bobbin,
The secondary resonance coil and the electromagnetic induction coil are mounted on an outer peripheral surface of the bobbin,
The first refrigerant passage is provided on the inner peripheral surface side of the bobbin;
The second refrigerant passage is provided on the outer peripheral surface side of the bobbin;
The secondary coil unit according to claim 2 . The rectifier is
Equipment,
A rectifier housing that houses the device and has a vent hole, and
Within said refrigerant passage, said as the vents in the direction of the refrigerant flow are opposite, the rectifier housing are arranged two-Tsugiko yl unit according to any one of claims 1 to 3. The secondary coil unit according to any one of claims 1 to 4 ,
A power transmission system comprising: a primary coil unit including the primary resonance coil that is disposed at a distance from the secondary resonance coil and performs electromagnetic resonance coupling with the secondary resonance coil.

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