SAME

BACKGROUND OF THE INVENTION

1. Field of the Invention

[0001] The invention relates to an electric power receiving apparatus and a vehicle provided with this electric power receiving apparatus. More particularly, the invention relates to an electric power receiving apparatus that receives electric power from an electric power feeding apparatus outside the vehicle without contact by resonating an electric power transmitting coil provided in the electric power feeding apparatus and an electric power receiving coil mounted in the vehicle, via an electromagnetic field, as well as to a vehicle provided with this electric power receiving apparatus.

2. Description of the Related Art

[0002] Vehicles such as electric vehicles and hybrid vehicles are receiving a lot of attention as environmentally f iendly vehicles. These vehicles are provided with an electric motor that generates driving force for running, and a rechargeable power storage device that stores electric power to be supplied to that electric motor. Incidentally, some hybrid vehicles, for example, are provided with an internal combustion engine as well as an electric motor as a power source, and some are provided with a fuel cell as well as an electric power storage device as a DC (direct current) power supply for driving the vehicle.

[0003] One known hybrid vehicle has an onboard power storage device that can be charged from a power supply outside the vehicle, similar to an electric vehicle. For example, a so-called plug-in hybrid vehicle is known in which an electric power storage device can be charged from a power supply of a typical home by connecting a charging inlet of the vehicle to an electrical outlet of a house, for example.

[0004] Meanwhile, wireless electric power transmission that does not use a power cord or an electric power transmitting cable has attracted attention in recent years as a way to transmit electric power. Three leading technologies for such wireless electric power transmission are electric power transmission using electromagnetic induction, electric power transmission using microwaves, and electric power transmission according to a resonance method.

[0005] Of these, the resonance method is a noncontact electric power transmission technology that transmits electric power via an electromagnetic field by resonating a pair of resonators (such as a pair of self-resonating coils) in the electromagnetic field (a near field). A large amount of electric power, i.e., several kilowatts, can also be transmitted over a relatively long distance (such as several meters).

[0006] An electric vehicle and an electric power feeding apparatus for a vehicle described in Japanese Patent Application Publication No. 2009-106136 (JP-A-2009- 106136), for example, are known regarding an electric power feeding apparatus and an electric power receiving apparatus using this resonance method.

[0007] la an electric power feed system using the resonance method, the electric power receiving characteristic changes according to the distance between the electric power feeding apparatus and the electric power receiving apparatus. Therefore, an electric power transmission test is performed by the electric power feeding apparatus, and the distance between the electric power feeding apparatus and the electric power receiving apparatus onboard the vehicle can be estimated by measuring the receiving voltage at that time.

[0008] However, if a detecting device that detects the receiving voltage is provided in an electric power receiving path of a high voltage portion, the control apparatus must be insulated from the detecting device by providing a photo coupler or the like between the detecting device and the control apparatus so that high voltage is not applied to the control apparatus that receives a detection signal from the detecting device. Also, high voltage may also be applied to the detecting device, so the detecting device must also be voltage-resistant No particular consideration is given to this in JP-A-2009-106136.

SUMMARY OF THE INVENTION

[0009] The invention provides an electric power receiving apparatus capable of detecting receiving voltage without providing a detecting device in an electric power receiving path of a high voltage portion, as well as a vehicle provided with this electric power receiving apparatus.

[0010] A first aspect of the invention relates to an electric power receiving apparatus provided in a vehicle. This electric power receiving apparatus includes: an electric power receiving coil that receives electric power without contacting an electric power transmitting coil included in an electric power feeding apparatus outside the vehicle by resonating with the electric power trarisnu ^' tting coil via an electromagnetic field; an electromagnetic induction coil that takes, by electromagnetic induction, the electric power received by die electric power receiving coil and outputs the electric power to an electrical system of the vehicle; and a detecting coil that takes, by electromagnetic induction, the electric power received by the electric power receiving coil, and that is configured such that a degree of electromagnetic coupling with the electric power receiving coil is smaller than the degree of electromagnetic coupling with the electromagnetic induction coil.

[0011] In this aspect, the detecting coil may be configured such that when the electric power is received by the electric power receiving coil, an output voltage of the detecting coil is lower than a predetermined voltage.

[0012] In the structure described above, the electric power receiving apparatus may also include: a detecting device that detects an output voltage of the detecting coil; and a control apparatus that receives the detected value of the output voltage from the detecting device without using an insulated circuit

[0013] In the structure described above, a coil diameter of the detecting coil may be different from a coil diameter of the electromagnetic induction coil, and the detecting coil may be arranged substantially coplanar with the electromagnetic induction coil. Also, in the structure described above, the coil diameter of the detecting coil may be smaller than the coil diameter of the electromagnetic induction coil.

[0014] In the structure described above, the detecting coil may be arranged offset from a central axis of the electric power receiving coil and the electromagnetic induction coil, and substantially coplanar with the electromagnetic induction coil.

[0015] In the structure described above, the electric power receiving coil, the electromagnetic induction coil, and the detecting coil may be arranged on substantially the same axis.

[0016] In the structure described above, a coil diameter of the detecting coil may be equal to a coil diameter of the electromagnetic induction coil, and the detecting coil may be arranged such that a distance between the detecting coil and the electric power receiving coil is different from the distance between the electromagnetic induction coil and the electric power receiving coil.

[0017] In this structure, the electric power receiving coil, the electromagnetic induction coil, and the detecting coil may be arranged on substantially the same axis.

[0018] In the structure described above, the electric power receiving apparatus may also include a bobbin for winding the electric power receiving coil, and the electromagnetic induction coil and the detecting coil may be wound around the bobbin.

[0019] A second aspect of the invention relates to a vehicle that includes the electric power receiving apparatus described above, and an electrical system that receives the electric power output from the electromagnetic induction coil included in the electric power receiving apparatus.

[0020] According to these aspects, a detecting coil that takes, by electromagnetic induction, the electric power received by the electric power receiving coil, and that is structured such that the degree of electromagnetic coupling with the electric power receiving coil is smaller than it is with the electromagnetic induction coil, is provided. Therefore, a detecting device mat is insulated from the electric power receiving path of the high voltage portion can be provided, and moreover, high voltage will not be applied to the detecting coil.

[0021] Thus, according to these aspects, the interlace between the detecting coil and a control apparatus or the like of a low voltage portion can be simplified. Also, cost reduction can be achieved through a reduction in the voltage resistance of the detection circuit that detects the voltage of the detecting coil and the like.

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The foregoing and further objects, features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings, wherein like numerals are used to represent like elements and wherein:

FIG 1 is a functional block diagram of the overall structure of a vehicular electric power feed system according to a first example embodiment of the invention;

FIG 2 is a view illustrating the principle of electric power transmission according to a resonance method

FIG 3 is a graph of the relationship between the electromagnetic field and the distance from a direct current (DC) source (i.e., a magnetic current source);

FIG 4 is a view of another structure of a detecting coil of the vehicle;

FIG 5 is a view of the structure of a detecting coil of a vehicle according to a second example embodiment of the invention;

FIG 6 is a view of the structure of a detecting coil according to a modified example of the second example embodiment; and

FIG 7 is a view of coils of a vehicle according to a third example embodiment of the invention.

DETAILED DESCRIPTION OF EMBODIMENTS

[0023] Example embodiments of the present invention will be described in greater detail below with reference to the accompanying drawings. Incidentally, like or corresponding parts in the drawings will be denoted by like reference characters and descriptions of those parts will not be repeated.

[0024] FIG 1 is a functional block diagram of the overall structure of a vehicular electric power feed system according to a first example embodiment of the invention. Referring to FIG 1, this vehicular electric power feed system includes an electric power feeding apparatus 100 and a vehicle 200.

[0025] The electric power feeding apparatus 100 includes a high f equency electric power supply 110, a coaxial cable 120, an electromagnetic induction coil 130, and a resonance coil 140. In addition, the electric power feeding apparatus 100 also includes a communication antenna 150, a communication device 160, and an ECU (Electronic Control Unit) 170.

[0026] The high frequency electric power supply 110 converts system power received from a power plug 350 that is connected to a system power supply to a predetermined high frequency electric power, and outputs this high frequency electric power to the coaxial cable 120. Incidentally, the frequency of the high f equency electric power generated by the high frequency electric power supply 110 is set to a predetermined value within a range from 1 MHz to over 10 MHz.

[0027] The electromagnetic induction coil 130 is arranged on substantially the same axis as the resonance coil 1 0, a predetermined distance from the resonance coil 140. The electromagnetic induction coil 130 is able to be magnetically coupled to the resonance coil 140 by electromagnetic induction, and feeds the high frequency electric power that is supplied from the high frequency electric power supply 110 via the coaxial cable 120 to the resonance coil 140 by electromagnetic induction.

[0028] The resonance coil 140 is an LC resonance coil that receives a supply of electric power from the electromagnetic induction coil 130 by electromagnetic induction. Then the resonance coil 140 transmits the electric power without contact to the vehicle 200 by resonating with an electric power receiving resonance coil 210 onboard the vehicle 200 via an electromagnetic field. Incidentally, with the resonance coil 140, the coil diameter and number of windings are set appropriately so that a Q value (e.g., Q > 100) and a degree of coupling κ and the like become larger, based on the resonance frequency and the distance from the resonance coil 210 of the vehicle 200 and the like.

[0029] The communication antenna 150 is connected to the communication device 160. The communication device 160 is a communication interface for communicating with a communication device 310 of the vehicle 200. This communication device 160 receives information output from the communication device 310 of the vehicle 200 and outputs this information to the ECU 70. Incidentally, the information output from the communication device 310 of the vehicle 200 to the communication device 160 includes such information as the receiving power of the vehicle 200 and an electric power transmission request command.

[0030] The ECU 170 controls the operation of the high frequency electric power supply 110. More specifically, when an electric power transmission request command is received by the communication device 160, the ECU 170 controls the high frequency electric power supply 110 to generate a predetermined high frequency electric power.

[0031] Meanwhile, the vehicle 200 includes the resonance coil 210, an electromagnetic induction coil 220, a rectifier circuit 230, a charger 240, an electric power storage device 250, and an power outputting system 260. In addition, the vehicle 200 also includes a detecting coil 270, a detecting device 280, an ECU 290, an insulated circuit 300, the communication device 10, and a communication antenna 320.

[0032] The resonance coil 210 is an LC resonance coil that receives electric power without contact from the electric power feeding apparatus 100 by resonating with the electric power transrnitting resonance coil 140 included in the electric power feeding apparatus 100 via an electromagnetic field. Incidentally, with this resonance coil 210 as well, the coil diameter and number of windings are set appropriately so that a Q value (e.g., Q > 100) and a degree of coupling κ and the like become larger, based on the resonance frequency and the distance from the resonance coil 140 of the electric power feeding apparatus 100 and the like.

[0033] The electromagnetic induction coil 220 is arranged on substantially the same axis as the resonance coil 210, a predetermined distance from the resonance coil 210. The electromagnetic induction coil 220 is able to magnetically couple to the resonance coil 210 by electromagnetic induction. This electromagnetic induction coil 220 takes, by electromagnetic induction, the electric power received by the resonance coil 210 and outputs this electric power to the rectifier circuit 230.

[0034] The rectifier circuit 230 rectifies the electric power (alternating current) taken from the resonance coil 210 using the electromagnetic induction coil 220, and outputs the rectified power to the charger 240. The charger 240 converts the electric power rectified by the rectifier circuit 230 into charging voltage for the electric power storage device 250 and outputs ft to the electric power storage device 250.

[0035] The electric power storage device 250 is a direct current (DC) power supply capable of being recharged, and is formed by a secondary battery such as lithium-ion or nickel hydrogen secondary battery, for example. In addition to storing electric power supplied from the charger 240, the electric power storage device 250 also stores regenerated electric power generated by the power outputting system 260. The electric power storage device 250 also supplies this stored electric power to the power outputting system 260. Incidentally, a large capacity capacitor may also be used as the electric power storage device 250. The electric power storage device 250 may be any one of a variety of devices as long as it is an electric power buffer capable of temporarily storing electric power supplied from the electric power feeding apparatus 100 and regenerated electric power f om the power outputting system 260, and supplying this stored electric power to the power outputting system 260.

[0036] The power outputting system 260 generates driving force for running the vehicle 200 using the electric power stored in the electric power storage device 250. Although not specifically shown, the power outputting system 260 includes an inverter that receives the electric power output from the electric power storage device 250, an electric motor that is driven by the inverter, and driving wheels that receive the driving force from the electric motor, and the like. Incidentally, the power outputting system 260 may also include an engine that can be driven by a generator for charging the electric power storage device 250.

[0037] The detecting coil 270 is able to be magnetically coupled to the resonance coil 210 by electromagnetic induction. This detecting coil 270 takes, by electromagnetic induction, the electric power received by the resonance coil 210, and is configured such that the degree of electromagnetic coupling with the resonance coil 210 is less than it is with the electromagnetic induction coil 220. More specifically, the detecting coil 270 is configured such that, when the power receiving coil 210 receives electric power from the electric power feeding apparatus 100, the output voltage of the detecting coil 270 is lower than a predetermined voltage (such as an upper limit value of an auxiliary voltage of the vehicle 200). In this first example embodiment, the coil diameter of the detecting coil 270 is smaller than the coil diameter of the electromagnetic induction coil 220, and the detecting coil 270 is arranged on substantially the same axis as the resonance coil 210 and the electromagnetic induction coil 220, and substantially coplanar with the electromagnetic induction coil 220.

[0038] This detecting coil 270 is provided separate from the electromagnetic induction coil 220 in order to detect the electric power received by the resonance coil 210. That is, for example, when aligning the resonance coil 210 of the vehicle 200 with the resonance coil 140 of the electric power feeding apparatus 100, a very small amount of electricity is output from the resonance coil 140 of the electric power feeding apparatus 100, and the distance between the resonance coil 140 and the resonance coil 210 can be estimated according to the amount of electricity detected in the electric power receiving path of the vehicle 200 (such as in front and in back of the rectifier circuit 230). However, if the detection circuit that detects the receiving voltage is provided in the electric power receiving path of a high voltage portion, the ECU 290 must be insulated from the detection circuit by, for example, providing a photo coupler or the like between the detection circuit and the ECU 290 so that high vo age is not applied to the ECU 290 that receives the detection signal from the detection circuit Also, high voltage may also be applied to the detection circuit, so the detection circuit must also be voltage-resistant Therefore, in this first example embodiment, the detecting coil 270 configured such that the degree of electromagnetic coupling with the resonance coil 210 is smaller than it is with the electromagnetic induction coil 220 is provided separate from the electromagnetic induction coil 220, and the electric power received by the resonance coil 210 is detected using this detecting coil 270.

[0039] The detecting device 280 is connected to the detecting coil 270 and detects the output voltage of the detecting coil 270. Alternatively, the detecting device 280 may, when necessary, measure the waveform of the output voltage of the detecting coil 270 or detect the envelope of the output voltage. Then, the detecting device 280 outputs the detection value of the output voltage of the detecting coil 270 to the ECU 290.

[0040] The ECU 290 outputs an electric power transmission request command to request the transmission of electric power from the electric power feeding apparatus 100 to the vehicle 200, to the communication device 310. Then, when electric power is feed from the electric power feeding apparatus 100 to the vehicle 200, the ECU 290 controls the operation of the charger 240. More specifically, the ECU 290 controls the charger 240 such that the electric power output from the rectifier circuit 230 is converted to charging voltage for the electric power storage device 250. Also, when aligning the resonance coil 210 of the vehicle 200 with the resonance coil 140 of the electric power feeding apparatus 100, for example, the ECU 290 receives the detection value of the output voltage of the detecting coil 270 from the detecting device 280 and performs the alignment by measuring the distance between the resonance coil 140 and the resonance coil 210 based on the received detection value.

[0041] The insulated circuit 300 is provided in a signal line between the ECU 290 and the charger 240, and insulates the ECU 290 from the charger 240 of the high voltage portion. The insulated circuit 300 is formed by a photo coupler or the like, for example.

[0042] The communication device 310 is a communication interface for communicating with the communication device 160 of the electric power feeding apparatus 100, and outputs information such as the electric power transmission request command received from the ECU 290 and the detection value of the receiving power and the like to the communication device 160 of the electric power feeding apparatus 100. The communication antenna 320 is connected to the communication device 310.

[0043] FIG 2 is a view illustrating the principle of electric power transmission according to the resonance method. Referring to FIG 2, with this resonance method, two LC resonance coils (resonance coils) are resonated in an electromagnetic field (near field), similar to resonating two tuning forks, such that electric power is transmitted from one coil to the other coil via the electromagnetic field.

[0044] More specifically, the electromagnetic induction coil 130 is connected to the high frequency electric power supply 110, and high frequency electric power is fed from the electromagnetic induction coil 130 to the resonance coil 140 that is magnetically coupled to the electromagnetic induction coil 130 by electromagnetic inductioa The resonance coil 140 is an LC resonance coil that resonates with the resonance coil 210 of the vehicle 200 via the electromagnetic field (near field). When this happens, energy (i.e., electric power) moves from the resonance coil 140 to the resonance coil 210 via the electromagnetic field. The energy (i.e., electric power) that has moved to the resonance coil 210 is taken from the resonance coil 210 by the electromagnetic induction coil 220 that is magnetically coupled to the resonance coil 210 by electromagnetic induction, and supplied to a load 330 (that represents the entire electrical system after the rectifier circuit 230).

[0045] FIG 3 is a graph showing the relationship between the intensity of the electromagnetic field and the distance from the current source (i.e., the magnetic current source). Referring to FIG 3, the electromagnetic field has three components, i.e., curve kl, curve k2, and curve k3. Curve kl is a component that is inversely proportionate to the distance from the wave source and is referred to as a radiated electromagnetic field. Curve k2 is a component that is inversely proportionate to the square of the distance from the wave source and is referred to as an induced electromagnetic field. Curve k3 is a component that is inversely proportionate to the cube of the distance from the wave source and is referred to as a static electromagnetic field.

[0046] Even in these, there is a region where the intensity of the electromagnetic waves suddenly decreases with the distance from the wave source, but with the resonance method, energy (i.e., electric power) is transmitted using this near field (i.e., an evanescent field). That is, by resonating a pair of resonators (such as the pair of LC resonance coils), energy (i.e., electric power) is transmitted from one resonator (e.g., the resonance coil 140 of the electric power feeding apparatus 100) to the other resonator (e.g., the resonance coil 210 of the vehicle 200) using the near field. This near field does not transmit energy (i.e., electric power) far away, so the resonance method is able to transmit electric power with less energy loss than the electromagnetic waves mat transmit energy (i.e., electric power) by a radiated electromagnetic field that transmits energy far away.

[0047] Referring back to FIG 1, in mis vehicular electric power feed system, high frequency electric power having a predetermined f equency is generated by the high f equency electric power supply 110. Then the high frequency electric power is supplied from the high frequency electric power supply 110 to the electromagnetic induction coil 130 via the coaxial cable 120, and the electric power is supplied from the electromagnetic induction coil 130 to the resonance coil 140 by electromagnetic induction.

[0048] When this happens, the resonance coil 140 of the electric power feeding apparatus 100 and the resonance coil 210 of the vehicle 200 resonate via the electromagnetic field, such that electric power is transmitted from the resonance coil 140 to the resonance coil 210. The electric power received by the resonance coil 210 in the vehicle 200 is taken from the resonance coil 210 by the electromagnetic induction coil 220 and supplied to the electric power storage device 250 via the rectifier circuit 230 and the charger 240.

[0049] Here, the detecting coil 270 for detecting the received electric power is provided in the vehicle 200 on the electric power receiving side. This detecting coil 270 is used to detect the amount of electric power received in the vehicle 200 when aligning the resonance coil 210 of the vehicle 200 with the resonance coil 140 of the electric power feeding apparatus 100, for example. The detecting coil 270 is configured such that the degree of electromagnetic coupling with the resonance coil 210 is smaller than it is with the electromagnetic induction coil 220, and the output voltage comes to match a predetermined voltage (such as an upper limit value of an auxiliary voltage of the vehicle 200). In this first example embodiment, the coil diameter of the detecting coil 270 is smaller than the coil diameter of the electromagnetic induction coil 220. This kind of structure enables the detection circuit formed by the detecting coil 270 and the detecting device 280 to be provided away from the electric power receiving path of the high voltage portion.

[0050] Incidentally, in the description above, the detecting coil 270 is arranged on substantially the same axis as the resonance coil 210 and the electromagnetic induction coil 220, and substantially coplanar with the electromagnetic induction coil 220. Alternatively, however, the detecting coil 270 may be arranged offset from the central axis of the resonance coil 210 and the electromagnetic induction coil 220, and substantially coplanar with the electromagnetic induction coil 220, as shown in FIG 4.

[0051] As described above, in this first example embodiment, the vehicle 200 is provided with the detecting coil 270 that takes, by electromagnetic induction, the electric power received by the resonance coil 210, and is configured such that the degree of electromagnetic coupling with the resonance coil 210 is smaller than it is with the electromagnetic induction coil 220. Therefore, a detecting device that is insulated from the electric power receiving path of the high voltage portion can be provided, and moreover, high voltage will not be applied to the detecting coil 270. Thus, according to this first example embodiment, the interface between the detecting coil 270 and the ECU 290 or the like of a low voltage portion can be simplified. Also, cost reduction can be achieved through a reduction in the voltage resistance of the detecting device 280 that detects the voltage of the detecting coil 270.

[0052] Further, according to this first example embodiment, the detecting coil 270 in which the degree of electromagnetic coupling with the resonance coil 210 is smaller than it is with the electromagnetic induction coil 220 has a smaller the coil diameter than the coil diameter of the electromagnetic induction coil 220, and is arranged substantially coplanar with the electromagnetic induction coil 220. As a result, the space needed to arrange the detecting coil 270 can be minimized

[0053] Next, a second example embodiment of the invention will be described. The second example embodiment differs f om the first example embodiment with respect to the structure of the detecting coil 270 of the vehicle 200.

[0054] FIG 5 is a view of the structure of the detecting coil 270 of the vehicle 200 according to the second example embodiment Referring to FIG 5, the detecting coil 270 is arranged on substantially the same axis as the resonance coil 210 and the electromagnetic induction coil 220, and in a position farmer away than the electromagnetic induction coil 220 when viewed from the resonance coil 210. The coil diameter of the detecting coil 270 is substantially the same as the coil diameter of the electromagnetic induction coil 220.

[0055] Incidentally, the detecting coil 270 does not have to be provided on substantially the same axis as the resonance coil 210 and the electromagnetic induction coil 220, and the coil diameter of the detecting coil 270 may be different from the coil diameter of the electromagnetic induction coil 220. However, providing the detecting coil 270 on substantially the same axis as the resonance coil 210 and the electromagnetic induction coil 220 makes it easier to ensure space in which to arrange the detecting coil 270. Also, having the coil diameter of the detecting coil 270 be substantially the same as the coil diameter of the electromagnetic induction coil 220 enables the detecting coil 270 to be manufactured by the same process as that of the electromagnetic induction coil 220, and thus enables nianufacturing costs to be reduced.

[0056] Incidentally, the other structure of the vehicle 200 in this second example embodiment is the same as the structure of the vehicle 200 in the first example embodiment shown FIG 1. Also, the structure of the electric power feeding apparatus 100 in the second example embodiment is the same as the structure of the electric power feeding apparatus 100 in the first example embodiment shown in FIG 1.

[0057] As described above, in this second example embodiment as well, the interface between the detecting coil 270 and the ECU 290 or the like can be simplified, and cost reduction can be achieved through a reduction in the voltage resistance of the detecting device 280, just as in the first example embodiment

[0058] Moreover, in this second example embodiment, the coil diameter of the detecting coil 270 is substantially the same as the coil diameter of the resonance coil 210 and the electromagnetic induction coil 220, so the manufacturing cost of the detecting coil 270 can be reduced.

[0059] With the second example embodiment described above, the detecting coil 270 is arranged in a position farther away than the electromagnetic induction coil 220 when viewed from the resonance coil 210, but the detecting coil 270 may alternatively be arranged between the resonance coil 210 and the electromagnetic induction coil 220, as shown in FIG 6.

[0060] Also, in this case, the detecting coil 270 does not have to be provided on substantially the same axis as the resonance coil 210 and the electromagnetic induction coil 220, and the coil diameter of the detecting coil 270 may be different from the coil diameter of the electromagnetic induction coil 220.

[0061] Next, a third example embodiment of the invention will be described. In this third example embodiment, the resonance coil 210, the electromagnetic induction coil 220, and the detecting coil 270 are mounted on a common (i.e., the same) bobbin in the vehicle 200.

[0062] FIG 7 is a view of the coils of the vehicle 200 according to the third example embodiment Referring to FIG 7, in the vehicle 200, the resonance coil 210, the electromagnetic induction coil 220, and the detecting coil 270 are wound around the outer periphery of a common bobbin 340. Incidentally, in FIG 7, the detecting coil 270 is arranged in a position farther away from the electromagnetic induction coil 220 when viewed from the resonance coil 210, but the detecting coil 270 may alternatively be provided between the resonance coil 210 and the electromagnetic induction coil 220 (this arrangement is not shown).

[0063] Incidentally, the other structure of the vehicle 200 in the third example embodiment is the same as the structure of the vehicle 200 in the first example embodiment shown in FIG 1. Also, the structure of the electric power feeding apparatus 100 in the third example embodiment is the same as the structure of the electric power feeding apparatus 100 in the first example embodiment shown in FIG 1. Similarly, the second embodiment can also be applied to this third example embodiment

[0064] As described above, in mis third example embodiment as well, the interface between the detecting coil 270 and the ECU 290 or the like can be simplified, and cost reduction can be achieved through a reduction in the voltage resistance of the detecting device 280, just as in the first example embodiment

[0065] Moreover, according to this third example embodiment, the resonance coil 210, the electromagnetic induction coil 220, and the detecting coil 270 are mounted on the common bobbin 340. This facilitates the manufacture of the electric power receiving portion formed by the resonance coil 210, the electromagnetic induction coil 220, and the detecting coil 270, and well as enables the manufacturing cost to be reduced.

[0066] Incidentally, in the example embodiments described above, the resonance coil 140 may correspond to the electric power transmitting coil of the invention, and the resonance coil 210 may correspond to the electric power receiving coil of the invention.

[0067] While the invention has been described with reference to example embodiments thereof, it is to be understood that the invention is not limited to the described embodiments or constructions. To the contrary, the invention is intended to cover various modifications and equivalent arrangements. In addition, while the various elements of the disclosed invention are shown in various example combinations and configurations, other combinations and configurations, including more, less or only a single element, are also within the scope of the appended claims.