JP6164490B2 - Non-contact power feeding device - Google Patents

Description

  The present invention includes a power supply pad and a filter circuit having an inductor coil and connected to the power supply pad. The power supply pads are opposed to each other, and power is supplied from one power supply pad to the other power supply pad in a contactless manner. The present invention relates to a contact power supply device.

  Conventionally, a power supply pad and a filter circuit having an inductor coil connected to the power supply pad are provided, the power supply pads are opposed to each other, and power is supplied from one power supply pad to the other power supply pad in a contactless manner. As an apparatus, there exists an inductively coupled electric power transmission system currently disclosed by patent document 1 shown below, for example.

  This inductively coupled power transmission system includes a transformer, a loop conductor, and a pickup coil. A filter circuit is configured using the leakage inductance of the transformer. The transformer insulates the alternating current supplied to the loop conductor and converts it into a predetermined voltage. The filter circuit removes a predetermined frequency component contained in the isolated alternating current. When the pickup coil is opposed to the loop conductor, the pickup coil and the loop conductor are magnetically coupled. As a result, electric power can be supplied from the loop conductor to the pickup coil in a non-contact manner. Here, the loop conductor and the pickup coil correspond to the power supply pad. The leakage inductance of the transformer corresponds to the inductance of the inductor coil.

Special table 2009-528812

  By the way, when using a filter circuit in a non-contact power feeding device, an inductor coil having a core is generally used.

  On the other hand, in the inductively coupled power transmission system described above, a filter circuit is configured by using the leakage inductance of the transformer. Therefore, it is not necessary to separately provide an inductor coil having a core for the filter circuit, and the apparatus can be miniaturized.

  However, it can only be applied to devices with a transformer. Moreover, when the inductance required for the filter circuit is large, the leakage inductance of the transformer must be increased, and the efficiency of the transformer is reduced.

  The present invention has been made in view of such circumstances, and can be applied even when a transformer is not provided, and can be reduced in size as compared with a case where an inductor coil having a core is separately provided. An object is to provide an apparatus.

  The present invention made in order to solve the above-described problems includes a power supply pad including a power supply core made of a magnetic material, a power supply coil provided on the power supply core and using the power supply core as a magnetic path, and an inductor coil. And a filter circuit connected to the power supply pad, the power supply pads connected to the filter circuit facing each other, and supplying power from one power supply pad to the other power supply pad in a contactless manner The at least one inductor coil of the filter circuit is provided in a power feeding core of a power feeding pad to which the filter circuit is connected, and the power feeding core is used as a magnetic path.

  According to this configuration, the power feeding core of the power feeding pad is used as the core constituting the magnetic path of the inductor coil. Therefore, it is applicable even when a transformer is not provided. In addition, the non-contact power feeding device can be downsized as compared with the case where an inductor coil having a core is separately provided.

It is a circuit diagram of the non-contact electric power feeder in 1st Embodiment. It is a top view of a power transmission side pad. It is AA arrow sectional drawing of FIG. It is explanatory drawing corresponding to FIG. 2 for demonstrating the flow of the electric current of a power transmission side pad. It is explanatory drawing corresponding to FIG. 3 for demonstrating the flow of the magnetic flux of a power transmission side pad. FIG. 2 is a circuit diagram of a power transmission circuit and a power reception circuit shown in FIG. 1. It is a top view of the core of the power transmission side pad for demonstrating arrangement | positioning of an inductor coil. It is a rear view of the core of the power transmission side pad for demonstrating arrangement | positioning of an inductor coil. It is BB arrow sectional drawing of FIG. It is explanatory drawing for demonstrating the flow of the magnetic flux of a power transmission side pad and an inductor coil. It is a top view of the core for demonstrating arrangement | positioning of the inductor coil of the non-contact electric power supply in 2nd Embodiment. It is CC sectional view taken on the line of FIG. It is explanatory drawing for demonstrating the flow of the magnetic flux of a power transmission side pad and an inductor coil. It is a circuit diagram of the power transmission circuit and power receiving circuit of the non-contact electric power feeder in 3rd Embodiment. It is a top view of the core for demonstrating arrangement | positioning of an inductor coil. It is a rear view of the core for demonstrating arrangement | positioning of an inductor coil. It is DD sectional view taken on the line of FIG. It is explanatory drawing corresponding to FIG. 16 for demonstrating the flow of the electric current of an inductor coil. It is explanatory drawing corresponding to FIG. 17 for demonstrating the flow of the magnetic flux of an inductor coil. It is explanatory drawing for demonstrating the flow of the magnetic flux of a power transmission side pad and an inductor coil. It is a top view of the core for demonstrating arrangement | positioning of the inductor coil of the non-contact electric power supply in 4th Embodiment. It is EE arrow sectional drawing of FIG. It is explanatory drawing corresponding to FIG. 21 for demonstrating the flow of the electric current of an inductor coil. It is explanatory drawing corresponding to FIG. 22 for demonstrating the flow of the magnetic flux of an inductor coil. It is explanatory drawing for demonstrating the flow of the magnetic flux of a power transmission side pad and an inductor coil. It is a top view of the power transmission side pad of the non-contact electric power feeder in 5th Embodiment. It is a rear view of a power transmission side pad. It is FF arrow sectional drawing of FIG. It is explanatory drawing corresponding to FIG. 26 for demonstrating the flow of the electric current of a power transmission side pad. It is explanatory drawing corresponding to FIG. 27 for demonstrating the flow of the electric current of a power transmission side pad. It is explanatory drawing corresponding to FIG. 28 for demonstrating the flow of the magnetic flux of a power transmission side pad. It is a top view of the power transmission side pad of the non-contact electric power supply in 6th Embodiment. It is GG arrow sectional drawing of FIG. It is explanatory drawing corresponding to FIG. 32 for demonstrating the flow of the electric current of a power transmission side pad. It is explanatory drawing corresponding to FIG. 33 for demonstrating the flow of the magnetic flux of a power transmission side pad. It is sectional drawing of the core for demonstrating the deformation | transformation form of an inductor coil. It is a top view of the core for demonstrating the deformation | transformation form of a core and an inductor coil. It is HH arrow sectional drawing of FIG.

  Next, the present invention will be described in more detail with reference to embodiments. In the present embodiment, an example in which the non-contact power feeding device according to the present invention is applied to a non-contact power feeding device that transmits power in a non-contact manner to a main battery mounted on an electric vehicle or a hybrid vehicle is shown.

(First embodiment)
First, the configuration of the non-contact power feeding device according to the first embodiment will be described with reference to FIGS. In addition, the front-back direction, the left-right direction, and the up-down direction in a figure show the direction in a vehicle.

  As shown in FIG. 1, an electric vehicle or a hybrid vehicle includes a motor generator MG, a main battery B1, an inverter circuit INV, an auxiliary machine S, an auxiliary battery B2, a DC / DC converter circuit CNV, and a controller. CNT.

  The motor generator MG is a device that operates as a motor by supplying three-phase alternating current and generates a driving force for traveling of the vehicle. Further, when the vehicle is decelerated, it is a device that operates as a generator by rotating with an external driving force and generates a three-phase alternating current.

  The main battery B1 is a chargeable / dischargeable power source that outputs a DC high voltage.

  The inverter circuit INV is a circuit that converts the direct current output from the main battery B1 into a three-phase alternating current and supplies it to the motor generator MG when the motor generator MG operates as a motor. Further, when the motor generator MG operates as a generator, it is also a circuit that converts the three-phase alternating current output from the motor generator MG into a direct current and supplies it to the main battery B1.

  The auxiliary machine S is a peripheral device such as a wiper device or an electric power steering device that operates by supplying a DC low voltage.

  The auxiliary battery B2 is a chargeable / dischargeable power source that outputs a DC low voltage.

  The DC / DC converter circuit CNV is a circuit that converts the DC high voltage output from the main battery B1 into a DC low voltage and supplies the converted voltage to the auxiliary battery B2 and the auxiliary machine S.

  The controller CNT is a device that controls the inverter circuit INV, the DC / DC converter circuit CNV, and the auxiliary machine S based on information on the main battery B1, the auxiliary battery B2, and the motor generator MG.

  The non-contact power supply device 1 is a device that supplies power to the main battery B1 mounted on the vehicle in a non-contact manner from an external power source PS installed outside the vehicle, and charges the main battery B1. The non-contact power supply device 1 includes a power transmission side pad 10 (power supply pad), a power transmission circuit 11, a power reception side pad 12, and a power reception circuit 13.

  The power transmission side pad 10 is installed at a predetermined position on the ground surface in the parking space facing the power receiving side pad 12 installed at the bottom of the vehicle when the vehicle is parked in the parking space. It is a device that generates. As shown in FIGS. 2 and 3, the power transmission side pad 10 includes a core 100 (power feeding core) and coils 101 and 102 (power feeding coils).

  The core 100 is a rectangular parallelepiped member made of a magnetic material and constituting a magnetic path. Specifically, it is a member made of ferrite or a dust core.

  The coils 101 and 102 are substantially rectangular annular members that are formed by winding conductive wires and generate magnetic flux when current flows. The coils 101 and 102 are arranged on the upper surface of the core 100 so as to be adjacent to each other in the front-rear direction with the axial direction of the core 101 being the vertical direction, and the core 100 is used as a magnetic path. Here, the axial direction of the coils 101 and 102 is a normal direction to the inner plane that passes through the axial centers of the annular coils 101 and 102 and is surrounded by the annular coils 101 and 102. The axial direction passes through the center of gravity of the annular coils 101 and 102. As indicated by arrows in FIG. 4, when current flows through the coils 101 and 102, magnetic flux is generated as indicated by arrows in FIG. When a reverse current flows, a reverse magnetic flux is generated.

  The power transmission circuit 11 illustrated in FIG. 1 transmits and receives information to and from the power reception circuit 13 through wireless communication, converts the output of the external power source PS into high-frequency alternating current based on the received information, and supplies the high-frequency alternating current to the power transmission side pad 10. Circuit. As shown in FIG. 6, the power transmission circuit 11 includes a power conversion circuit 110, a filter circuit 111, and a resonance capacitor 112, and is installed outside the vehicle.

  The power conversion circuit 110 is a circuit that converts the output of the external power source PS into a high-frequency alternating current and outputs the alternating current. The input end of the power conversion circuit 110 is connected to the external power source PS, and the output end is connected to the filter circuit 111 and the power transmission side pad 10.

  The filter circuit 111 is a circuit that removes a predetermined frequency component included in the alternating current supplied from the power conversion circuit 110. The filter circuit 111 includes an inductor coil 1110 and a capacitor 1111.

  As shown in FIGS. 7 to 9, the inductor coil 1110 is a substantially rectangular annular element configured by winding a conducting wire. The inductor coil 1110 is provided in the core 100 of the power transmission side pad 10 and uses the core 100 as a magnetic path. The inductor coil 1110 is provided such that the coupling coefficient with the coils 101 and 102 of the power transmission side pad 10 is substantially zero. Here, the coupling coefficient of approximately 0 indicates that the coupling coefficient is within an allowable range that is close to 0 including 0. The inductor coil 1110 is embedded in the vicinity of the center of the core 100 in the front-rear direction, the left-right direction, and the up-down direction, with its own axial direction being the front-rear direction. Then, the magnetic permeability of the quadrangular columnar axial center portion 1110 a is configured to be lower than the magnetic permeability of the core 100. Specifically, the shaft center part 1110a is constituted by an air layer. Here, the axial direction is a normal direction to the inner plane that passes through the axial center of the annular inductor coil 1110 and is surrounded by the annular inductor coil 1110. The axial direction passes through the center of gravity of the annular inductor coil 1110. The axial center portion 1110a is an inner portion surrounded by the annular inductor coil 1110 and is a columnar portion extending in the axial direction.

  Therefore, when current flows through the coils 101 and 102 as shown by arrows in FIG. 4 and magnetic flux is generated as shown by arrows in FIG. 5, magnetic flux is generated inside and around the core 100 as shown in FIG. The magnetic flux hardly flows through the axial center part 1110a of the inductor coil 1110. That is, the magnetic flux hardly links the inductor coil 1110. Therefore, the influence of the magnetic flux generated by the coils 101 and 102 can be suppressed as much as possible.

  As shown in FIG. 6, the inductor coil 1110 and the capacitor 1111 are connected in series. One end of the inductor coil 1110 is connected to the output end of the power conversion circuit 110, and one end of the capacitor 1111 is connected to the power transmission side pad 10.

  The resonance capacitor 112 is a circuit that forms a resonance circuit together with the coils 101 and 102 of the power transmission side pad 10. The resonance capacitor 112 is connected in parallel to the power transmission side pad 10.

  The power receiving side pad 12 shown in FIG. 1 is installed at the bottom of the vehicle, and when the vehicle is parked in the parking space, the power receiving side pad 12 is disposed to face the power transmitting side pad 10 with an interval in the vertical direction. It is a device that generates alternating current by electromagnetic induction when the generated alternating magnetic flux is interlinked. The power receiving side pad 12 includes a core and a coil. The power reception side pad 12 has the same configuration as the power transmission side pad 10 and is installed upside down.

  The power receiving circuit 13 is a circuit that transmits and receives information to and from the power transmitting circuit 11 by wireless communication, converts the alternating current supplied from the power receiving side pad 12 to direct current based on the received information, and charges the main battery B1. . As shown in FIG. 6, the power receiving circuit 13 includes a resonance capacitor 130, a filter circuit 131, and a power conversion circuit 132.

The resonance capacitor 130 is a circuit that forms a resonance circuit together with the coil of the power receiving side pad 12. The resonance capacitor 130 is connected in parallel to the power receiving side pad 12.

  The filter circuit 131 is a circuit that removes a predetermined frequency component included in the alternating current supplied from the power receiving side pad 12 to which the resonance capacitor 130 is connected. The filter circuit 131 includes a capacitor 1310 and an inductor coil 1311.

  The inductor coil 1311 has the same configuration as the inductor coil 1110, is provided in the core of the power receiving side pad 12, and uses the core as a magnetic path. Therefore, similarly to the inductor coil 1110, the influence of the magnetic flux generated by the coil of the power receiving side pad 12 can be suppressed as much as possible.

  The capacitor 1310 and the inductor coil 1311 are connected in series. One end of the capacitor 1310 is connected to the power receiving side pad 12, and one end of the inductor coil 1311 is connected to the power conversion circuit 132.

  The power conversion circuit 132 is a circuit that converts alternating current supplied via the filter circuit 131 into direct current and supplies the direct current to the main battery B1. The input end of the power conversion circuit 132 is connected to the filter circuit 131 and the power receiving side pad 12, and the output end is connected to the main battery B1.

  Next, the operation of the non-contact power feeding device will be described with reference to FIGS.

  As shown in FIG. 1, when a vehicle is parked in the parking space, the power transmission side pad 10 and the power reception side pad 12 face each other with a predetermined interval in the vertical direction. In this state, when a charge start button (not shown) is pressed and the start of charging is instructed, the power transmission circuit 11 and the power reception circuit 13 transmit and receive information by wireless communication.

  The power conversion circuit 110 shown in FIG. 6 converts the output of the external power source PS into a high-frequency alternating current and outputs it. The filter circuit 111 removes a predetermined frequency component included in the alternating current supplied from the power conversion circuit 110. The power transmission side pad 10 to which the resonance capacitor 112 is connected generates alternating magnetic flux when AC is supplied through the filter circuit 111.

  The magnetic flux generated by the power transmission side pad 10 flows inside and around the core 100 as indicated by arrows in FIG. The inductor coil 1110 is embedded in the core 100 as shown in FIGS. And as shown in FIG. 9, the axial center part 1110a of the inductor coil 1110 is comprised by the air layer. Therefore, as shown in FIG. 10, the magnetic flux hardly flows through the axial center portion 1110a of the inductor coil 1110. That is, the magnetic flux hardly links the inductor coil 1110. Therefore, the influence of the magnetic flux generated by the coils 101 and 102 can be suppressed as much as possible. Thereby, the characteristics of the filter circuit 111 can be ensured.

  The power receiving side pad 12 connected to the resonance capacitor 130 is linked to the alternating magnetic flux generated by the power transmitting side pad 10 to generate an alternating current by electromagnetic induction. The filter circuit 131 removes a predetermined frequency component included in the alternating current supplied from the power receiving side pad 12 to which the resonance capacitor 130 is connected.

  The magnetic flux generated by the power receiving side pad 12 flows inside and around the core. However, the inductor coil 1311 has the same configuration as the inductor coil 1110. Therefore, the magnetic flux hardly links the inductor coil 1311. Therefore, the influence of the magnetic flux generated by the coil of the power receiving side pad 12 can be suppressed as much as possible. Thereby, the characteristics of the filter circuit 131 can be ensured.

  The power conversion circuit 132 converts alternating current supplied via the filter circuit 131 into direct current and supplies the direct current to the main battery B1. In this way, power can be supplied from the external power source PS to the main battery B1 in a non-contact manner to charge the main battery B1.

  Next, the effect of the non-contact power feeding device of the first embodiment will be described.

  According to the first embodiment, the inductor coil 1110 of the filter circuit 11 is provided in the core 100 of the power transmission side pad 10 to which the filter circuit 11 is connected, and the core 100 is used as a magnetic path. In other words, the core 100 of the power transmission side pad 10 is used as the core constituting the magnetic path of the inductor coil 1110. Therefore, it is applicable even when a transformer is not provided. Moreover, the non-contact electric power feeder 1 can be reduced in size compared with the case where the inductor coil which has a core is provided separately.

  According to the first embodiment, the inductor coil 1110 is provided so that the coupling coefficient with the coils 101 and 102 of the power transmission side pad 10 is substantially zero. Therefore, the influence of the magnetic flux generated by the coils 101 and 102 can be suppressed as much as possible. Thereby, the characteristics of the filter circuit 111 can be ensured.

  According to the first embodiment, the inductor coil 1110 is embedded in the core 100. Therefore, the magnetic flux generated by the inductor coil 1110 is difficult to leak out of the core 100. That is, the magnetic flux generated by the inductor coil 1110 hardly links the coils 101 and 102 disposed on the upper surface of the core 100. Therefore, the influence of the magnetic flux generated by the inductor coil 1110 can be suppressed as much as possible.

  According to the first embodiment, the inductor coil 1110 has a substantially rectangular ring shape, and is configured such that the magnetic permeability of the axial center portion 1110 a is lower than the magnetic permeability of the core 100. Therefore, when a current flows through the coils 101 and 102 as shown by arrows in FIG. 4 and a magnetic flux is generated as shown by arrows in FIG. 5, as shown by arrows in FIG. The magnetic flux flows, and the magnetic flux hardly flows through the axial center portion 1110a of the inductor coil 1110. That is, the magnetic flux hardly links the inductor coil 1110. Therefore, the coupling coefficient between the inductor coil 1110 and the coils 101 and 102 of the power transmission side pad 10 can be surely made substantially zero.

  According to 1st Embodiment, the axial center part 1110a of the inductor coil 1110 is comprised by the air layer. Therefore, the magnetic permeability of the axial center portion 1110a can be surely made lower than the magnetic permeability of the core 100.

(Second Embodiment)
Next, the non-contact power feeding device of the second embodiment will be described. The non-contact power supply device of the second embodiment is obtained by changing only the arrangement of the inductor coil with respect to the non-contact power supply device of the first embodiment. Except for the inductor coil, the contactless power supply device of the first embodiment is the same. Therefore, only the configuration of the inductor coil will be described with reference to FIGS. 11 to 13 and the description of the operation will be omitted. In addition, the same component as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  The inductor coil 1110 shown in FIGS. 11 and 12 is a substantially rectangular annular element configured by winding a conducting wire. The inductor coil 1110 is embedded in the vicinity of the central portion of the core 100 in the front-rear direction, the left-right direction, and the up-down direction, with its own axial direction set in the up-down direction. And the quadratic prism-shaped axial center part 1110a is comprised by the air layer. When a current flows through the coils 101 and 102 and a magnetic flux is generated, the magnetic flux flows in and around the core 100 as shown by arrows in FIG. 13, and the magnetic flux hardly flows through the axial center portion 1110a of the inductor coil 1110. .

  Next, the effect of the non-contact power feeding device of the second embodiment will be described. According to the second embodiment, the same effect as that of the first embodiment can be obtained.

(Third embodiment)
Next, the non-contact electric power feeder of 3rd Embodiment is demonstrated. The contactless power supply device of the third embodiment is obtained by changing the configuration of the filter circuit and the configuration of the inductor coil in accordance with the contactless power supply device of the first embodiment. Except for the filter circuit and the inductor coil, the contactless power supply device of the first embodiment is the same. Therefore, only the configuration of the filter circuit and the configuration of the inductor coil will be described with reference to FIGS. 14 to 20, and description of the operation will be omitted. In addition, the same component as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  As shown in FIG. 14, the filter circuit 111 includes inductor coils 1110 and 1112 and capacitors 1111 and 1113.

  As shown in FIGS. 15 to 17, the inductor coils 1110 and 1112 are substantially rectangular annular elements configured by winding a conductive wire. The inductor coils 1110 and 1112 are adjacent to the vertical direction perpendicular to the axial direction with the axial direction of their own axes being the front-rear direction, and are embedded in the vicinity of the center of the core 100 in the front-rear direction, the left-right direction, and the vertical direction. Yes. And the quadratic prism-shaped axial center part 1110a, 1112a is comprised by the air layer.

  The inductor coils 1110 and 1112 are wired so that magnetic fluxes generated when a current flows through the filter circuit 111 do not cancel each other. Specifically, when a current flows through the filter circuit 111, the magnetic flux in the axial center portion 1110a generated by the inductor coil 1110 and the magnetic flux in the axial center portion 1112a generated by the inductor coil 1112 are wired in opposite directions. ing. More specifically, the inductor coils 1110 and 1112 are wired so that when a current flows through the filter circuit 111, a current as indicated by an arrow in FIG. 18 flows. In this case, as shown in FIG. 19, the magnetic flux in the axial center portion 1110a generated by the inductor coil 1110 and the magnetic flux in the axial center portion 1112a generated by the inductor coil 1112 are in opposite directions. Therefore, the magnetic flux generated by the inductor coil 1110 and the magnetic flux generated by the inductor coil 1112 do not cancel each other. When a current flows through the coils 101 and 102 and a magnetic flux is generated, as indicated by arrows in FIG. 20, the magnetic flux flows in and around the core 100, and the magnetic flux flows through the axial portions 1110a and 1112a of the inductor coils 1110 and 1112. There is hardly anything.

  Next, the effect of the non-contact power feeding device of the third embodiment will be described. According to the third embodiment, the same effect as that of the first embodiment can be obtained.

  According to the third embodiment, two inductor coils 1110 and 1112 are provided in one core 100. Therefore, the non-contact power feeding device 1 can be further downsized as compared with the case where two inductor coils having a core are separately provided.

  According to the third embodiment, the inductor coils 1110 and 1112 are arranged adjacent to each other. Therefore, the situation where the physique of the core 100 becomes large can be suppressed.

  According to the third embodiment, the inductor coils 1110 and 1112 are wired so that magnetic fluxes generated when a current flows through the filter circuit 111 do not cancel each other. Therefore, the characteristics of the filter circuit 111 can be ensured.

(Fourth embodiment)
Next, the non-contact electric power feeder of 4th Embodiment is demonstrated. The contactless power supply device according to the fourth embodiment is obtained by changing only the arrangement of the inductor coils with respect to the contactless power supply device according to the third embodiment. Except for the inductor coil, the contactless power supply apparatus of the third embodiment is the same. Therefore, only the configuration of the inductor coil will be described with reference to FIGS. 21 to 25, and the description of the operation will be omitted. In addition, the same component as 3rd Embodiment attaches the same code | symbol, and abbreviate | omits description.

  As shown in FIGS. 21 and 22, the inductor coils 1110 and 1112 are substantially rectangular annular elements configured by winding conductive wires. Inductor coils 1110 and 1112 are adjacent to the front-rear direction orthogonal to the axial direction with their own axial direction being the vertical direction, and are embedded in the vicinity of the center of the core 100 in the front-rear direction, the left-right direction, and the vertical direction. Yes. And the quadratic prism-shaped axial center part 1110a, 1112a is comprised by the air layer.

  The inductor coils 1110 and 1112 are wired so that magnetic fluxes generated when a current flows through the filter circuit 111 do not cancel each other. Specifically, when a current flows through the filter circuit 111, the magnetic flux in the axial center portion 1110a generated by the inductor coil 1110 and the magnetic flux in the axial center portion 1112a generated by the inductor coil 1112 are wired in opposite directions. ing. More specifically, the inductor coils 1110 and 1112 are wired so that when a current flows through the filter circuit 111, a current as shown by an arrow in FIG. 23 flows. In this case, as shown in FIG. 24, the magnetic flux in the axial center portion 1110a generated by the inductor coil 1110 and the magnetic flux in the axial center portion 1112a generated by the inductor coil 1112 are in opposite directions. Therefore, the magnetic flux generated by the inductor coil 1110 and the magnetic flux generated by the inductor coil 1112 do not cancel each other. When a current flows through the coils 101 and 102 and a magnetic flux is generated, the magnetic flux flows inside and around the core 100 as indicated by arrows in FIG. There is hardly anything.

  Next, the effect of the non-contact power feeding device of the fourth embodiment will be described. According to the fourth embodiment, the same effect as that of the third embodiment can be obtained.

(Fifth embodiment)
Next, the non-contact electric power feeder of 5th Embodiment is demonstrated. The contactless power supply device of the fifth embodiment is obtained by changing only the coil configuration of the power transmission side pad and the power reception side pad with respect to the contactless power supply device of the first embodiment. Except for the coils of the power transmission side pad and the power reception side pad, the contactless power supply apparatus of the first embodiment is the same. Therefore, only the configuration of the coils of the power transmission side pad and the power reception side pad will be described with reference to FIGS. 26 to 31, and description of the operation will be omitted. In addition, the same component as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  As shown in FIGS. 26 to 28, the power transmission side pad 10 includes a core 100 (power feeding core) and a coil 103 (power feeding coil).

  The coil 103 is a substantially rectangular annular member that is formed by winding a conductive wire and generates a magnetic flux when a current flows. The coil 103 is disposed along the outer peripheral surface of the core 100 with its own axial center direction being the front-rear direction, and uses the core 100 as a magnetic path. As shown by arrows in FIGS. 29 and 30, when a current flows through the coil 103, magnetic flux is generated as shown by arrows in FIG. When a reverse current flows, a reverse magnetic flux is generated. As shown by arrows in FIGS. 29 and 30, when a current flows through the coil 103 and a magnetic flux is generated, the magnetic flux flows inside and around the core 100 as shown by arrows in FIG. 31, and the axial center of the inductor coil 1110. Magnetic flux hardly flows through the portion 1110a.

  The power reception side pad 12 has the same configuration as the power transmission side pad 10 and is installed upside down.

  Next, the effect of the non-contact power feeding device of the fifth embodiment will be described. According to the fifth embodiment, the same effect as that of the first embodiment can be obtained.

(Sixth embodiment)
Next, the non-contact electric power feeder of 6th Embodiment is demonstrated. The contactless power supply device of the sixth embodiment is obtained by changing only the coil configuration of the power transmission side pad and the power reception side pad with respect to the contactless power supply device of the first embodiment. Except for the coils of the power transmission side pad and the power reception side pad, the contactless power supply apparatus of the first embodiment is the same. Therefore, only the configuration of the coils of the power transmission side pad and the power reception side pad will be described with reference to FIGS. 32 to 35, and description of the operation will be omitted. In addition, the same component as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  As shown in FIGS. 32 and 33, the power transmission side pad 10 includes a core 100 (power feeding core) and a coil 104 (power feeding coil).

  The coil 104 is a substantially rectangular annular member that is formed by winding a conductive wire and generates a magnetic flux when a current flows. The coil 104 is disposed in the vicinity of the center portion in the front-rear direction and the left-right direction of the upper surface of the core 100 with its own axial direction being the vertical direction, and uses the core 100 as a magnetic path. When an electric current flows through the coil 104 as shown by an arrow in FIG. 34, a magnetic flux is generated as shown by an arrow in FIG. When a reverse current flows, a reverse magnetic flux is generated. As shown by arrows in FIG. 34, when current flows through the coil 104 and magnetic flux is generated, magnetic flux flows in and around the core 100 as shown by arrows in FIG. 35, and the axial center portion 1110a of the inductor coil 1110 is moved. Magnetic flux hardly flows.

  The power reception side pad 12 has the same configuration as the power transmission side pad 10 and is installed upside down.

  Next, effects of the non-contact power feeding device according to the sixth embodiment will be described. According to the sixth embodiment, the same effect as in the first embodiment can be obtained.

  In the first to sixth embodiments, the inductor coil of the filter circuit on the power transmission circuit side uses the core of the power transmission side pad as a magnetic path, and the inductor coil of the filter circuit on the power reception circuit side magnetizes the core of the power reception side pad. Although the example used as a road is given, it is not limited to this. The inductor coil of at least one of the filter circuits may use the core of the pad to which the filter circuit is connected as the magnetic path.

  In the first to sixth embodiments, an example in which the magnetic permeability of the axial center portion of the inductor coil is configured to be lower than the magnetic permeability of the core is described, but the present invention is not limited to this. As illustrated in FIG. 36, the axial center portion 1110 a may have the same magnetic permeability as the core 100, and the magnetic permeability of the end portion 1110 b of the axial center portion 1110 a may be lower than the magnetic permeability of the core 100. It is only necessary that the magnetic permeability of at least one of the axial center portion 1110 a and the end portion 1110 b of the axial center portion 1110 a is lower than the magnetic permeability of the core 100.

  In 1st-6th embodiment, in order to make it lower than the magnetic permeability of a core, the example comprised by an air layer is given, However, It is not restricted to this. You may comprise with a nonmagnetic material.

  In the first to sixth embodiments, an example is described in which the resonance capacitor is connected in parallel to the power transmission side pad and the power reception side pad, but the present invention is not limited to this. The resonance capacitor may be connected in series to the power transmission side pad and the power reception side pad, respectively.

  In the first to sixth embodiments, the filter circuit is configured by an inductor coil and a capacitor connected in series. However, the present invention is not limited to this. The filter circuit may have other configurations. What is necessary is just to have an inductor coil.

  In 1st-6th embodiment, although the coil of a power transmission side pad and a power receiving side pad, and the inductor coil gave the example which is a substantially rectangular ring shape, it is not restricted to this. The coil of the power transmission side pad, the power reception side pad, and the inductor coil may be annular or semi-annular. Any ring shape may be used.

  In the first to sixth embodiments, an example in which the core has a rectangular parallelepiped shape is given, but the present invention is not limited to this. The core may be cylindrical. Any shape that can form a magnetic path may be used. You may make it the axial center part of a coil be comprised with the magnetic material of a core.

  In the first to sixth embodiments, an example is described in which the core is formed of a ferrite or a dust core, but the present invention is not limited to this. You may be comprised by laminating a silicon steel plate or plate-shaped amorphous in the thickness direction. In that case, the core may be embedded so that the magnetic flux generated by the inductor coil is orthogonal to the stacking direction. As shown in FIG. 37, a core 100 is formed by laminating plate-like magnetic materials 100a in the thickness direction, and only a portion that generates a magnetic flux perpendicular to the laminating direction when current flows through the inductor coil 1110 is cored. A portion that is embedded in 100 and generates a magnetic flux in the stacking direction may be disposed outside the core 100.

  In the third and fourth embodiments, an example in which the inductor coils 1110 and 1112 are embedded in the core 100 adjacent to the direction orthogonal to the axial direction is described, but the present invention is not limited to this. It may be embedded in the core 100 adjacent to the axial direction. When a current flows through the filter circuit 111, the magnetic flux can be obtained if the magnetic flux in the axial center portion 1110 a generated by the inductor coil 1110 and the magnetic flux in the axial center portion 1112 a generated by the inductor coil 1112 are in the same direction. Do not cancel each other.

  In the third and fourth embodiments, an example is given in which two inductor coils 1110 and 1112 are embedded in the core 100, but the present invention is not limited to this. Three or more inductor coils may be embedded in the core.

  In the third and fourth embodiments, inductor coils 1110 and 1112 are adjacently embedded in the core 100 and are wired so that magnetic fluxes generated when a current flows through the filter circuit 111 do not cancel each other. However, it is not limited to this. Depending on the configuration of the filter circuit, when current flows through the filter circuit, wiring may be possible only so that magnetic fluxes generated by a plurality of inductor coils constituting the filter circuit cancel each other. In that case, a plurality of inductor coils may be arranged apart from each other. The situation where magnetic fluxes cancel each other can be suppressed as much as possible.

  In the fifth and sixth embodiments, an example in which the configuration of the inductor coil is the same as that of the first embodiment is given, but the present invention is not limited to this. The configuration of the inductor coil may be the same as in the second to fourth embodiments. The same effects as those of the second to fourth embodiments can be obtained by combining with any configuration.

DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power feeder, 10 ... Power transmission side pad (power feeding pad), 100 ... Core (core for electric power feeding), 101, 102 ... Coil (coil for electric power feeding), 11 ... Power transmission Circuit 110 110 power conversion circuit 111 filter circuit 1110 inductor coil 1111 capacitor 112 resonance capacitor

Claims (8)

A power supply pad (10) having a power supply core (100) made of a magnetic material and a power supply coil (101, 102, 103, 104) provided on the power supply core and using the power supply core as a magnetic path; ,
A filter circuit (111) having an inductor coil and connected to the power supply pad;
In the non-contact power supply device that supplies the power supply pads from one power supply pad to the other power supply pad in a non-contact manner, the power supply pads connected to the filter circuit are opposed to each other,
The inductor coil (1110, 1112) of at least one of the filter circuits is provided in the power supply core of the power supply pad to which the filter circuit is connected, and the power supply core is used as a magnetic path. A non-contact power feeding device.   The contactless power supply device according to claim 1, wherein the inductor coil provided in the power supply core is provided so that a coupling coefficient with the power supply coil is substantially zero.   The non-contact power feeding device according to claim 2, wherein the inductor coil provided in the power feeding core is embedded in the power feeding core.   The inductor coil provided in the power feeding core is an annular coil, and the magnetic permeability of at least one of the shaft center and the end of the shaft core is lower than the magnetic permeability of the power feeding core. The contactless power supply device according to claim 3.   The contactless power supply device according to claim 4, wherein the inductor coil provided in the power supply core includes at least one of an axial center portion and an end portion of the axial center portion made of an air layer or a nonmagnetic material. .   The non-contact power feeding device according to claim 1, wherein a plurality of the inductor coils are provided in one power feeding core.   The non-contact power feeding apparatus according to claim 6, wherein the plurality of inductor coils provided in one power feeding core are arranged adjacent to each other.   The plurality of inductor coils provided in one power feeding core are wired so that magnetic fluxes generated when a current flows through the filter circuit do not cancel each other. The contactless power supply device according to 7.