JP6460405B2 - Non-contact power feeding device - Google Patents

Description

  The present invention includes a power transmission side pad having a winding and a power reception side pad having a winding, and after the relative position of the power reception side pad with respect to the power transmission side pad is determined, at least one of the power transmission side pad and the power reception side pad It is related with the non-contact electric power feeder which adjusts the coupling coefficient of the coil | winding of a power transmission side pad, and the coil | winding of a power receiving side pad.

  Conventionally, a power transmission side pad having a winding and a power reception side pad having a winding are provided, and after the relative position of the power reception side pad with respect to the power transmission side pad is determined, at least one of the power transmission side pad and the power reception side pad is displaced. As a non-contact power feeding device that adjusts the coupling coefficient between the winding of the power transmission side pad and the winding of the power receiving side pad, for example, there is a non-contact power transmission device disclosed in Patent Document 1 shown below.

  This non-contact power transmission device is a device that transmits power from a high-frequency power source outside the vehicle to a vehicle battery mounted on the vehicle in a non-contact manner and charges the vehicle battery. The non-contact power transmission device includes a high-frequency power source, a power transmitter, a power receiver, and a rectifier.

  The high frequency power supply is a circuit that supplies high frequency alternating current to a power transmitter. A power transmitter is a device that is installed at a predetermined position in a parking space and generates magnetic flux when AC is supplied from a high-frequency power source. The power transmitter includes a primary coil and a primary capacitor. The primary coil is a member that generates magnetic flux when AC is supplied from a high-frequency power source. The primary side capacitor is an element that forms a resonance circuit together with the primary side coil. The primary side capacitor is connected in parallel to the primary side coil. The power receiver is a device that is installed at the bottom of the vehicle, generates alternating current by interlinking with the magnetic flux generated by the power transmitter, and supplies the alternating current to the rectifier. The power receiver includes a secondary coil and a secondary capacitor. The secondary coil is a member that generates alternating current by interlinking with the magnetic flux generated by the power transmitter. The secondary capacitor is an element that forms a resonance circuit together with the secondary coil. The secondary capacitor is connected in parallel to the secondary coil. The rectifier is a circuit that converts alternating current supplied from the power receiver into direct current and supplies it to the vehicle battery.

  The non-contact power transmission apparatus is configured so that the axial direction of the primary coil and the axial direction of the secondary coil are parallel after the vehicle is parked in the parking space and the relative position of the power receiver with respect to the power transmitter is determined. Rotate the power transmitter. As a result, in a state where the relative position of the power receiver with respect to the power transmitter is determined, the coupling coefficient between the primary side coil and the secondary side coil can be maximized.

  Here, the primary side coil and the secondary side coil correspond to the windings of the power transmission side pad and the power reception side pad.

JP 2013-121258 A

  In the non-contact power transmission apparatus described above, the coupling coefficient between the primary side coil and the secondary side coil varies depending on the difference in the parking position of the vehicle in the parking space. That is, it changes depending on the relative position of the power receiver with respect to the power transmitter. The coupling coefficient increases as the transmitter and receiver are closer, and decreases as the transmitter is farther away. When the coupling coefficient changes with a change in the relative position of the power receiver with respect to the power transmitter, the input impedance of the subsequent circuit of the high-frequency power source supplied with alternating current from the high-frequency power source changes. For example, if the coupling coefficient changes with the change in the relative position of the power receiver with respect to the power transmitter, and the input impedance of the subsequent circuit of the high-frequency power source decreases, the current supplied from the high-frequency power source to the subsequent circuit increases, causing loss Will increase. Further, the phase difference between the current and voltage supplied from the high frequency power source to the subsequent circuit increases, and the loss of the high frequency power source increases. Therefore, the circuit must be configured to cope with such a change in loss, and the apparatus becomes large.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a non-contact power feeding device that can suppress a change in loss even if the relative position of the power receiving side pad with respect to the power transmitting side pad changes. And

A first invention made to solve the above problems is a power transmission side pad having a core that forms a magnetic path, a winding that generates a magnetic flux when supplied with an alternating current, and a core that forms a magnetic path. And a power receiving side pad having a winding that generates alternating current by interlinking magnetic flux generated by the power transmitting side pad, and a power transmission circuit that is connected to the winding of the power transmitting side pad and supplies alternating current to the winding. The power receiving circuit connected to the winding of the power receiving side pad and the power feeding target, the alternating current supplied from the winding converted into direct current and supplied to the power feeding target, and the relative position of the power receiving side pad with respect to the power transmitting side pad are determined In a non-contact power feeding apparatus including a coupling coefficient adjusting unit that displaces at least one of a power transmission side pad and a power reception side pad and adjusts a coupling coefficient between a winding of the power transmission side pad and a winding of the power reception side pad. , the minimum value of the coupling coefficient When the power transmission side pad and the power reception side pad are within a predetermined range, the power transmission side pad and the power reception side pad can be adjusted by displacing at least one of the power transmission side pad and the power reception side pad in a state where the power transmission side pad and the power reception side pad are farthest apart. This is the maximum value of the coupling coefficient . At least one of the power transmission side pad and the power reception side pad is displaced so as to be.
According to this configuration, the input impedance of the subsequent circuit of the power transmission circuit that has a correspondence relationship with the coupling coefficient and changes with the coupling coefficient can be within the allowable range. Therefore, it is possible to suppress a change in loss that occurs with a change in input impedance. Thereby, it is not necessary to configure a circuit so as to cope with a change in loss, and the apparatus can be miniaturized.

A second invention made to solve the above problems is a power transmission side pad having a core that forms a magnetic path, a winding that generates a magnetic flux when supplied with an alternating current, and a core that forms a magnetic path. And a power receiving side pad having a winding that generates alternating current by interlinking magnetic flux generated by the power transmitting side pad, and a power transmission circuit that is connected to the winding of the power transmitting side pad and supplies alternating current to the winding. The power receiving circuit connected to the winding of the power receiving side pad and the power feeding target, the alternating current supplied from the winding converted into direct current and supplied to the power feeding target, and the relative position of the power receiving side pad with respect to the power transmitting side pad are determined In a non-contact power feeding apparatus including a coupling coefficient adjusting unit that displaces at least one of a power transmission side pad and a power reception side pad and adjusts a coupling coefficient between a winding of the power transmission side pad and a winding of the power reception side pad. , Coupling coefficient adjustment means The input impedance of the subsequent circuit of the power transmission circuit is obtained, and the coupling coefficient is within the allowable range even if the relative position of the power receiving side pad changes with respect to the power transmission side pad based on the comparison result of the input impedance target value and the obtained input impedance. At least one of the power transmission side pad and the power reception side pad is displaced so as to be.
According to this configuration, the input impedance of the subsequent circuit of the power transmission circuit that has a correspondence relationship with the coupling coefficient and changes with the coupling coefficient can be within the allowable range. Therefore, it is possible to suppress a change in loss that occurs with a change in input impedance. Thereby, it is not necessary to configure a circuit so as to cope with a change in loss, and the apparatus can be miniaturized.

It is a circuit diagram of the non-contact electric power feeder in 1st Embodiment. It is a top view of the power transmission side pad shown in FIG. It is a front view of the power transmission side pad shown in FIG. It is a side view of the power transmission side pad shown in FIG. It is explanatory drawing for demonstrating the installation state of the power transmission side pad and power receiving side pad which are shown in FIG. It is explanatory drawing for demonstrating the installation state of the power transmission side pad shown in FIG. It is a bottom view of the power receiving side pad shown in FIG. FIG. 3 is a front view of the power receiving side pad shown in FIG. 1. It is a side view of the power receiving side pad shown in FIG. It is a block diagram of the power transmission side control circuit shown in FIG. It is a graph which shows the relationship between the coupling coefficient k with respect to the distance of a power transmission side pad and a power receiving side pad, and input impedance Zin. It is a flowchart for demonstrating operation | movement of the non-contact electric power feeder in 1st Embodiment. It is explanatory drawing which looked at the power transmission side pad and power receiving side pad for demonstrating the relationship between the distance of a power transmission side pad and a power receiving side pad, and the rotation state of a power transmission side pad. It is another explanatory view which looked at the power transmission side pad and power receiving side pad for demonstrating the relationship between the distance of a power transmission side pad and a power receiving side pad, and the rotation state of a power transmission side pad. It is another explanatory view which looked at the power transmission side pad and power receiving side pad for demonstrating the relationship between the distance of a power transmission side pad and a power receiving side pad, and the rotation state of a power transmission side pad. It is a graph for demonstrating the relationship of the coupling coefficient k with respect to the distance of a power transmission side pad and a power receiving side pad. It is a circuit diagram of the non-contact electric power feeder in 2nd Embodiment. It is a block diagram of the power transmission side control circuit shown in FIG. It is a flowchart for demonstrating operation | movement of the non-contact electric power feeder in 2nd Embodiment. It is a graph for demonstrating the relationship of the coupling coefficient k with respect to the distance of the power transmission side pad and power receiving side pad in a deformation | transformation form. It is a top view of the 1st modification of a power transmission side pad. It is a top view of the 2nd modification of a power transmission side pad. It is a top view of the 3rd modification of a power transmission side pad. It is a top view of the 4th modification of a power transmission side pad. It is a front view of the 4th modification of a power transmission side pad. It is a top view of the 5th modification of a power transmission side pad. It is a top view of the 6th modification of a power transmission side pad. It is a top view of the 7th modification of a power transmission side pad.

  Next, the present invention will be described in more detail with reference to embodiments. In this embodiment, the example which applied the non-contact electric power feeder which concerns on this invention to the non-contact electric power feeder which transmits non-contact to the vehicle-mounted battery mounted in the electric vehicle or the 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.

  A non-contact power supply device 1 shown in FIG. 1 is a device that charges a vehicle battery B1 by transmitting power from a commercial power supply AC1 outside the vehicle to a vehicle battery B1 (power supply target) mounted on the vehicle in a contactless manner. The non-contact power feeding device 1 includes a power transmission circuit 10, a power transmission side pad 11, a power transmission side resonance capacitor 12, a power reception side pad 13, a power reception side resonance capacitor 14, a power reception circuit 15, and a drive device 16 (coupled). Coefficient adjusting means) and a control circuit 17 (coupling coefficient adjusting means).

  The power transmission circuit 10 is a circuit that converts alternating current supplied from the commercial power supply AC1 into high-frequency alternating current and supplies the alternating current to the power transmission side pad 11 and the power transmission side resonance capacitor 12. The power transmission circuit 10 is provided outside the vehicle. The input end of the power transmission circuit 10 is connected to the commercial power supply AC1, and the output end is connected to the power transmission side pad 11 and the power transmission side resonance capacitor 12.

  The power transmission side pad 11 is a device that generates alternating magnetic flux when AC is supplied from the power transmission circuit 10. As shown in FIGS. 2 to 4, the power transmission side pad 11 includes a power transmission core 110 (core), a power transmission winding 111 (winding), and a shield plate 112.

  The power transmission core 110 is made of a magnetic material and is a rectangular plate member that forms a magnetic path.

  The power transmission winding 111 is a member having a rectangular shape as viewed from the axial direction, which generates an alternating magnetic flux when AC is supplied from the power transmission circuit 10. The power transmission winding 111 is configured by winding a conductive wire around the power transmission core 110 in a rectangular shape. As shown in FIG. 1, one end and the other end of the power transmission winding 111 are respectively connected to the output end of the power transmission circuit 10.

  The shield plate 112 shown in FIGS. 2 to 4 is made of a conductive material and is a rectangular plate-like member that shields leakage magnetic flux toward the ground surface. The shield plate 112 is provided on the ground surface side of the power transmission winding 111.

  As shown in FIG.5 and FIG.6, the power transmission side pad 11 is installed in the predetermined position in a parking space in the state exposed from the ground surface.

  The power transmission side resonance capacitor 12 shown in FIG. 1 is an element that forms a resonance circuit together with the power transmission winding 111. The power transmission side resonance capacitor 12 is provided in the vicinity of the power transmission winding 111 outside the vehicle. The power transmission resonance capacitor 12 is connected in parallel to the power transmission winding 111.

  The power receiving side pad 13 is a device that generates alternating current by electromagnetic induction by interlinking with the alternating magnetic flux generated by the power transmitting side pad 11 and supplies it to the power receiving circuit 15. As shown in FIGS. 7 to 9, the power receiving side pad 13 includes a power receiving core 130 (core), a power receiving winding 131 (winding), and a shield plate 132.

  The power receiving core 130 is a rectangular plate-shaped member that is made of a magnetic material and forms a magnetic path.

  The power receiving winding 131 is a member having a rectangular shape as viewed from the axial direction, which generates alternating current by electromagnetic induction by interlinking with the alternating magnetic flux generated by the power transmitting winding 111. The power receiving winding 131 is configured by winding a conductive wire around the power receiving core 130 in a rectangular shape. As shown in FIG. 1, one end and the other end of the power receiving winding 131 are connected to the power receiving circuit 15, respectively.

  The shield plate 132 is made of a conductive material and is a rectangular plate-like member that shields leakage magnetic flux to the vehicle side. The shield plate 132 is provided on the vehicle side of the power receiving winding 131.

  As shown in FIG. 5, the power receiving side pad 13 is installed at the bottom of the vehicle.

  The power reception-side resonance capacitor 14 shown in FIG. 1 is an element that forms a resonance circuit together with the power reception winding 131. The power receiving resonance capacitor 14 is provided in the vicinity of the power receiving winding 131 at the bottom of the vehicle. The power reception side resonance capacitor 14 is connected in parallel to the power reception winding 131.

  The power receiving circuit 15 is a circuit that converts the alternating current supplied from the power receiving winding 131 connected to the power receiving side resonance capacitor 14 into a direct current, supplies the direct current to the in-vehicle battery B1, and charges the in-vehicle battery B1. The power receiving circuit 15 is provided in the vehicle. The input end of the power receiving circuit 15 is connected to one end and the other end of the power receiving winding 131 to which the power receiving side resonance capacitor 14 is connected, and the output end is connected to the in-vehicle battery B1.

  The driving device 16 is controlled by the control circuit 17, and after the relative position of the power receiving side pad 13 with respect to the power transmitting side pad 11 is determined, the power transmitting side pad 11 is displaced, and the coupling coefficient k between the power transmitting winding 111 and the power receiving winding 131 is determined. It is a device that adjusts. Specifically, even if the relative position of the power receiving side pad 13 with respect to the power transmitting side pad 11 changes due to the difference in the parking position of the vehicle in the parking space, the power transmitting side pad 11 is rotated so that the coupling coefficient k is constant. Device. The drive device 16 includes a turntable 160, a motor 161, and a drive circuit 162.

  The turntable 160 is a device that rotates the power transmission side pad 11. As shown in FIG.5 and FIG.6, the turntable 160 is installed in the state which exposed the surface from the ground surface in the predetermined position of the parking space.

  The motor 161 is a device that is driven by the drive circuit 162 and generates a driving force for rotating the turntable 160. The motor 161 is installed in the ground at a predetermined position in the parking space, and is connected to the rotation shaft of the turntable 160. And as shown in FIG. 1, it is connected to the drive circuit 162.

  The drive circuit 162 is a circuit that is controlled by the control circuit 17 and drives the motor 161. The drive circuit 162 is provided outside the vehicle. The drive circuit 162 is connected to the control circuit 17 and the motor 161, respectively.

  The control circuit 17 is a circuit that controls the power transmission circuit 10 and the power reception circuit 15 based on the output power target value input from the vehicle control device E1 and the detection result detected by itself. The control circuit 17 includes a power transmission side current sensor 170, a power transmission side control circuit 171, a power reception side current sensor 172, and a power reception side control circuit 173.

  The power transmission side current sensor 170 is an element that detects the output current I1 of the power transmission circuit 10 and outputs the detection result. The power transmission side current sensor 170 is provided so as to clamp the wiring to the wiring connecting the power transmission circuit 10 and the power transmission side resonance capacitor 12. The output end of the power transmission side current sensor 170 is connected to the power transmission side control circuit 171.

  The power transmission side control circuit 171 uses the output voltage V1 of the power transmission circuit 10 detected by itself, the output current I1 of the power transmission circuit 10 detected by the power transmission side current sensor 170, and information received from the power reception side control circuit 173 by wireless communication. Based on this, the power transmission circuit 10 and the drive circuit 162 are controlled. The power transmission side control circuit 171 is provided outside the vehicle. The power transmission side control circuit 171 is connected to the output end of the power transmission side current sensor 170 and the output end of the power transmission circuit 10. Further, the power transmission circuit 10 and the drive circuit 162 are connected to each other. As shown in FIG. 10, the power transmission side control circuit 171 includes a coupling coefficient calculation unit 171a and a drive command calculation unit 171b.

  The coupling coefficient calculator 171a is a block that calculates and outputs the coupling coefficient k by a known method based on the output voltage V1 and the output current I1 of the power transmission circuit 10.

  The drive command calculation unit 171b is a block that calculates and outputs a drive command based on a comparison result between the preset coupling coefficient target value k * and the coupling coefficient k output from the coupling coefficient calculation unit 171a. Specifically, this is a block that performs proportional and integral calculations on the deviation between the coupling coefficient target value k * and the coupling coefficient k and outputs it as a drive command. As shown in FIG. 11, the coupling coefficient k increases as the power transmission side pad 11 and the power reception side pad 13 are closer, and decreases as the distance is longer. When the vehicle is parked in the parking space, the position of the power receiving side pad 13 changes depending on the parking position. As a result, the power transmission side pad 11 and the power reception side pad 13 are disposed within a predetermined range. The coupling coefficient target value k * is determined when the vehicle is parked in the parking space and the power transmission side pad 11 and the power reception side pad have the smallest coupling coefficient k when the power transmission side pad 11 and the power reception side pad 13 are within a predetermined range. 13 is set to the maximum value of the coupling coefficient k that can be adjusted by rotating the power transmission side pad 11 with the furthest away state.

  The power receiving side current sensor 172 shown in FIG. 1 is an element that detects the output current I2 of the power receiving circuit 15 and outputs the detection result. The power receiving side current sensor 172 is provided to clamp the wiring to the wiring connecting the power receiving circuit 15 and the in-vehicle battery B1. The output end of the power receiving side current sensor 172 is connected to the power receiving side control circuit 173.

  The power receiving side control circuit 173 wirelessly outputs the output power target value input from the vehicle control device E1, the output voltage V2 of the power receiving circuit 15 detected by itself, and the output current I2 of the power receiving circuit 15 detected by the power receiving side current sensor 172. This is a circuit that transmits to the power transmission side control circuit 171 by communication and controls the power reception circuit 15 based on information received from the power transmission side control circuit 171. The power receiving side control circuit 173 is provided in the vehicle. The power receiving side control circuit 173 is connected to the output terminal of the power receiving side current sensor 172 and the output terminal of the power receiving circuit 15. Moreover, it is connected to the vehicle control device E1 and the power receiving circuit 15, respectively.

  Next, the operation of the non-contact power feeding apparatus according to the first embodiment will be described with reference to FIGS. 1 and 10 to 16.

  When the vehicle is parked in the parking space, the relative position of the power receiving side pad 13 with respect to the power transmitting side pad 11 shown in FIG. 1 is determined. The power transmission winding 111 and the power reception winding 131 are opposed to 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 non-contact power feeding device 1 starts operation.

  As shown in FIG. 12, the power transmission side control circuit 171 determines whether or not a charge completion command for the in-vehicle battery B1 is input from the outside (S100).

  If it is determined in step S100 that the charging completion command has been input, the power transmission side control circuit 171 ends the charging of the in-vehicle battery B1. On the other hand, if it is determined in step S100 that the charging completion command has not been input, the power transmission side control circuit 171 calculates the coupling coefficient k (S101). Then, it is determined whether or not the calculated coupling coefficient k matches a preset coupling coefficient target value k * (S102).

  If it is determined in step S102 that the coupling coefficient k does not match the coupling coefficient target value k *, the power transmission side control circuit 171 outputs a drive command and rotates the power transmission side pad 11 (S103). On the other hand, when it is determined in step S102 that the coupling coefficient k matches the coupling coefficient target value k *, and after the execution of step S103, the process returns to step S100.

  The power transmission side control circuit 171 and the power reception side control circuit 173 shown in FIG. 1 control the power transmission circuit 10 and the power reception circuit 15 under preset conditions in order to obtain the coupling coefficient k. The power transmission circuit 10 converts alternating current supplied from the commercial power supply AC1 into high-frequency alternating current and supplies the high-frequency alternating current to the power transmission winding 111 to which the power transmission side resonance capacitor 12 is connected.

  The output voltage V1 and the output current I1 of the power transmission circuit 10 change according to the coupling coefficient k. 10 calculates and outputs the coupling coefficient k based on the output voltage V1 and the output current I1 of the power transmission circuit 10. The coupling coefficient calculation unit 171a illustrated in FIG.

  The drive command calculation unit 171b shown in FIG. 10 performs a proportional and integral calculation on the deviation between the preset coupling coefficient target value k * and the coupling coefficient k, and outputs it as a drive command. The drive circuit 162 shown in FIG. 1 rotates the motor 161 based on the drive command input from the power transmission side control circuit 171. When the motor 161 rotates, the turntable 160 rotates, and the power transmission side pad 11 rotates accordingly. As a result, the coupling coefficient k changes.

  Then, by repeating these operations, the coupling coefficient k is finally adjusted to the coupling coefficient target value k *. That is, when the vehicle is parked in the parking space, the coupling coefficient k that can be adjusted by rotating the power transmission side pad 11 with the power transmission side pad 11 and the power reception side pad 13 being the farthest away from each other. Is adjusted to the maximum value. Even if the relative position of the power receiving side pad 13 with respect to the power transmitting side pad 11 changes due to the difference in the parking position of the vehicle in the parking space, the coupling coefficient k is similarly adjusted to the coupling coefficient target value k *.

  When the vehicle is parked in the parking space, the position of the power receiving pad changes depending on the parking position. As a result, the power transmission side pad and the power reception side pad are arranged within a predetermined range. When the power transmission side pad 11 and the power reception side pad 13 are in the most distant state, as shown in FIG. 13, the power transmission side pad 11 rotates, the axial direction of the power transmission winding 111 of the power transmission side pad 11 and the power reception side pad 13. The angle formed by the axial direction of the power receiving winding 131 is 0 deg, that is, the axial direction of the power transmitting winding 111 is parallel to the axial direction of the power receiving winding 131. When the power transmission side pad 11 and the power reception side pad 13 are in a state closer to the above-described state, the power transmission side pad 11 rotates and the axial direction of the power transmission winding 111 of the power transmission side pad 11 and the power reception as shown in FIG. The angle formed by the axial direction of the power receiving winding 131 of the side pad 13 is θ1 (> 0 deg). When the state is closer to the state described above, as shown in FIG. 15, the power transmission side pad 11 rotates, the axial direction of the power transmission winding 111 of the power transmission side pad 11 and the power reception winding 131 of the power reception side pad 13. The angle formed by the axial direction is θ2 (> θ1).

  As a result, as shown in FIG. 16, except for the state where the power transmission side pad 11 and the power reception side pad 13 are farthest apart, the coupling coefficient k is lower than when the power transmission side pad 11 is not rotated, and the minimum coupling coefficient k is obtained. The ratio of the maximum value kmax to the value kmin is 1, that is, the coupling coefficient k is constant. Even if the relative position of the power receiving side pad 13 with respect to the power transmitting side pad 11 changes, the coupling coefficient k that can be adjusted by rotating the power transmitting side pad 11 in a state where the power transmitting side pad 11 and the power receiving side pad 13 are farthest from each other. It becomes the maximum value.

  Incidentally, as shown in FIG. 11, when the power transmission side resonance capacitor 12 and the power reception side resonance capacitor 14 are connected in series to the power transmission winding 111 and the power reception winding 131, the input impedance Zin of the subsequent circuit of the power transmission circuit 10. Is proportional to the square of the coupling coefficient k. On the other hand, when the power transmission side resonance capacitor 12 and the power reception side resonance capacitor 14 are connected in parallel to the power transmission winding 111 and the power reception winding 131, the input impedance Zin is inversely proportional to the coupling coefficient k, and the power transmission side pad 11 and power reception are received. The closer the side pad 13 is, the smaller it becomes, and the farther the side pad 13 becomes, the larger it becomes. Therefore, when the coupling coefficient k is adjusted to be the coupling coefficient target value k *, the power transmission side resonance capacitor 12 and the power reception side resonance capacitor 14 are connected in parallel to the power transmission winding 111 and the power reception winding 131. In the case, the input impedance Zin is larger than that in the case of serial connection. Therefore, compared with the case where the power transmission side resonance capacitor 12 and the power reception side resonance capacitor 14 are connected in series to the power transmission winding 111 and the power reception winding 131, the current supplied from the power transmission circuit 10 to the subsequent circuit is reduced. Loss can be suppressed.

  Thereafter, the non-contact power feeding device 1 starts an operation for transmitting power from the commercial power source AC1 to the in-vehicle battery B1.

  The power reception side control circuit 173 transmits the output power target value, the output voltage V2 of the power reception circuit 15 and the output current I2 to the power transmission side control circuit 171 by wireless communication. The power transmission side control circuit 171 transmits power based on the output voltage V1 and output current I1 of the power transmission circuit 10, the output power target value received from the power reception side control circuit 173 by wireless communication, the output voltage V2 and output current I2 of the power reception circuit 15. The circuit 10 is controlled. In addition, information necessary for controlling the power receiving circuit 15 is transmitted to the power receiving side control circuit 173 by wireless communication.

  The power transmission circuit 10 converts alternating current supplied from the commercial power supply AC1 into high-frequency alternating current and supplies the high-frequency alternating current to the power transmission winding 111 to which the power transmission side resonance capacitor 12 is connected. When alternating current is supplied, the power transmission winding 111 generates an alternating magnetic flux.

  The power receiving winding 131 generates an alternating current by electromagnetic induction by interlinking with the alternating magnetic flux generated by the power transmitting winding 111. The power reception side control circuit 173 controls the power reception circuit 15 based on information received from the power transmission side control circuit 171 by wireless communication. The power receiving circuit 15 converts the alternating current supplied from the power receiving winding 131 connected to the power receiving resonance capacitor 14 into a direct current and supplies it to the in-vehicle battery B1 to charge the in-vehicle battery B1.

  In this way, power can be transmitted from the commercial power supply AC1 to the in-vehicle battery B1 in a contactless manner.

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

  According to the first embodiment, the driving device 16 is controlled by the power transmission side control circuit 171, and even if the relative position of the power reception side pad 13 with respect to the power transmission side pad 11 changes due to the difference in the parking position of the vehicle in the parking space. The power transmission side pad 11 is displaced so that the coupling coefficient k is within an allowable range, specifically, constant. Therefore, there is a correspondence relationship with the coupling coefficient k, and the input impedance Zin that varies with the coupling coefficient k can be made constant. Therefore, it is possible to suppress a change in loss that occurs with a change in the input impedance Zin. Thereby, it is not necessary to configure the power transmission circuit 10 and the power reception circuit 15 so as to cope with a change in loss, and the apparatus can be miniaturized.

  According to the first embodiment, the coupling coefficient target value k * is the smallest when the vehicle is parked in the parking space and the power transmission side pad 11 and the power reception side pad 13 are within the predetermined range. The coupling coefficient k is set to the maximum value that can be adjusted by rotating the power transmission side pad 11 with the power transmission side pad 11 and the power reception side pad 13 being farthest apart. Therefore, the power transmission side pad 11 is displaced so that the ratio of the maximum value to the minimum value of the coupling coefficient k is 1, that is, constant. Therefore, even if the relative position of the power receiving side pad 13 with respect to the power transmitting side pad 11 changes due to the difference in the parking position of the vehicle in the parking space, the coupling coefficient k can be kept constant as much as possible.

  According to the first embodiment, the power transmission side control circuit 171 obtains the coupling coefficient k, and calculates and outputs a drive command based on the comparison result between the coupling coefficient target value k * and the obtained coupling coefficient k. The drive device 16 displaces the power transmission side pad 11 based on the drive command input from the power transmission side control circuit 171. Therefore, even if the relative position of the power receiving side pad 13 with respect to the power transmitting side pad 11 changes due to the difference in the parking position of the vehicle in the parking space, the power transmitting side pad 11 is surely displaced so that the coupling coefficient k is constant. Can do.

  According to the first embodiment, the non-contact power feeding device 1 includes the power transmission side resonance capacitor 12 and the power reception side resonance capacitor 14. The power transmission side resonance capacitor 12 and the power reception side resonance capacitor 14 are connected in parallel to the power transmission winding 111 and the power reception winding 131. Therefore, the input impedance Zin of the subsequent circuit of the power transmission circuit 10 is inversely proportional to the coupling coefficient k, and decreases as the power transmission side pad 11 and the power reception side pad 13 are closer, and increases as the distance is longer. Therefore, when the coupling coefficient k is adjusted to be the coupling coefficient target value k *, the power transmission side resonance capacitor 12 and the power reception side resonance capacitor 14 are connected in series to the power transmission winding 111 and the power reception winding 131. Compared to the case, the input impedance Zin becomes large. As a result, compared to the case where the power transmission side resonance capacitor 12 and the power reception side resonance capacitor 14 are connected in series to the power transmission winding 111 and the power reception winding 131, the current supplied from the power transmission circuit 10 to the subsequent circuit is reduced. , Can reduce the loss.

  According to the first embodiment, the driving device 16 is controlled by the power transmission side control circuit 171 to rotate the power transmission side pad 11. Therefore, the coupling coefficient k can be adjusted reliably.

  According to the first embodiment, the power transmission winding 111 and the power reception winding 131 are rectangular when viewed from the axial direction. Therefore, the power transmission winding 111 and the power reception winding 131 can be stably arranged.

(Second Embodiment)
Next, the non-contact power feeding device of the second embodiment will be described. In the non-contact power feeding device of the second embodiment, the non-contact power feeding device of the first embodiment obtains a drive command based on the coupling coefficient target value and the coupling coefficient, whereas the input impedance target value of the subsequent circuit of the power transmission circuit The drive command is obtained based on the input impedance. Further, the non-contact power feeding device of the first embodiment has the power transmission side resonance capacitor and the power reception side resonance capacitor connected in parallel to the power transmission winding and the power reception winding, whereas the power transmission side resonance capacitor and the power reception side. A resonance capacitor is connected in series to a power transmission winding and a power reception winding, and a power transmission side immittance conversion circuit and a power reception side immittance conversion circuit are provided.

  First, with reference to FIG.17 and FIG.18, the structure of the non-contact electric power feeder of 2nd Embodiment is demonstrated.

  The non-contact power supply device 2 shown in FIG. 17 is a device that transmits power from the commercial power supply AC2 outside the vehicle to the in-vehicle battery B2 (power supply target) mounted on the vehicle in a non-contact manner and charges the in-vehicle battery B2. The non-contact power feeding device 2 includes a power transmission circuit 20, a power transmission side pad 21, a power transmission side resonance capacitor 22, a power reception side pad 23, a power reception side resonance capacitor 24, a power reception circuit 25, and a driving device 26 (coupled). Coefficient adjusting means) and a control circuit 27 (coupling coefficient adjusting means). Furthermore, a power transmission side immittance conversion circuit 28 and a power reception side immittance conversion circuit 29 are provided.

  The power transmission circuit 20 is the same circuit as the power transmission circuit 10 of the first embodiment. The input end of the power transmission circuit 20 is connected to the commercial power supply AC2, and the output end is connected to the power transmission side immittance conversion circuit 28.

  The power transmission side pad 21 is the same device as the power transmission side pad 11 of the first embodiment, and includes the same power transmission winding 211 as the power transmission winding 111.

  The power transmission side resonance capacitor 22 is an element having the same function as the power transmission side resonance capacitor 12 of the first embodiment, and is provided in the vicinity of the power transmission winding 211 outside the vehicle, similarly to the power transmission side resonance capacitor 12. It has been. Unlike the power transmission side resonance capacitor 12, the power transmission side resonance capacitor 22 is connected in series to the power transmission winding 211. Specifically, one end of the power transmission side resonance capacitor 22 is connected to one end of the power transmission winding 211.

  The power transmission side immittance conversion circuit 28 is a circuit that performs immittance conversion. Specifically, it is a circuit in which the impedance viewed from one terminal pair is proportional to the admittance of the circuit connected to the other terminal pair. The power transmission side immittance conversion circuit 28 includes reactors 280 and 281 and a capacitor 282. Reactors 280 and 281 are connected in series. One end of the reactor 280 is connected to one output end of the power transmission circuit 20, and one end of the reactor 281 is connected to the other end of the power transmission side resonance capacitor 22. One end of the capacitor 282 is connected to the series connection point of the reactors 280 and 281, and the other end is connected to the other output end of the power transmission circuit 20 and the other end of the power transmission winding 211.

  The power receiving side pad 23 is the same device as the power receiving side pad 13 of the first embodiment, and includes the same power receiving winding 231 as the power receiving winding 131.

  The power reception side resonance capacitor 24 is an element having the same function as the power reception side resonance capacitor 14 of the first embodiment, and is provided in the vicinity of the power reception winding 231 at the bottom of the vehicle, similarly to the power reception side resonance capacitor 14. It has been. Unlike the power receiving side resonance capacitor 14, the power receiving side resonance capacitor 24 is connected in series to the power receiving winding 231. Specifically, one end of the power receiving resonance capacitor 24 is connected to one end of the power receiving winding 231.

  The power receiving side immittance conversion circuit 29 is a circuit that performs immittance conversion. Specifically, it is a circuit in which the impedance viewed from one terminal pair is proportional to the admittance of the circuit connected to the other terminal pair. The power receiving side immittance conversion circuit 29 includes reactors 290 and 291 and a capacitor 292. Reactors 290 and 291 are connected in series. One end of the reactor 290 is connected to the other end of the power receiving side resonance capacitor 24, and one end of the reactor 291 is connected to the power receiving circuit 25. One end of the capacitor 292 is connected to the series connection point of the reactors 290 and 291, and the other end is connected to the other end of the power receiving winding 231 and the power receiving circuit 25.

  The power receiving circuit 25 is the same circuit as the power receiving circuit 15 of the first embodiment. One input end of the power receiving circuit 25 is connected to one end of the reactor 291, the other input end is connected to the other end of the capacitor 292, and the output end is connected to the in-vehicle battery B <b> 2.

  The drive device 26 is the same device as the drive device 16 of the first embodiment, and includes the same turntable 260, motor 261, and drive circuit 262 as the turntable 160, motor 161, and drive circuit 162, and the same wiring. Has been made.

  The control circuit 27 is a circuit having the same function as the control circuit 17 of the first embodiment, and includes a power transmission side current sensor 270, a power transmission side control circuit 271, a power reception side current sensor 272, and a power reception side control circuit 273. It has. The power transmission side current sensor 270, the power reception side current sensor 272, and the power reception side control circuit 273 are the same circuits as the power transmission side current sensor 170, the power reception side current sensor 172, and the power reception side control circuit 173 of the first embodiment. Wiring is made.

  The power transmission side control circuit 271 is a circuit having the same function as the power transmission side control circuit 171 of the first embodiment, but has an internal configuration different from that of the power transmission side control circuit 171. As shown in FIG. 18, the power transmission side control circuit 271 includes an input impedance calculation unit 271c, an output impedance calculation unit 271d, an input impedance target value calculation unit 271e, and a drive command calculation unit 271f.

  The input impedance calculation unit 271c is a block that calculates and outputs the input impedance Zin of the subsequent circuit of the power transmission circuit 20 based on the output voltage V1 and the output current I1 of the power transmission circuit 20. The input impedance calculator 271c calculates and outputs the input impedance Zin based on the equation (1).

Zin = V1 / I1 (1)

  The output impedance calculation unit 271d is a block that calculates and outputs the output impedance of the power receiving circuit 25 based on the output voltage V2 and the output current I2 of the power receiving circuit 25 received from the power receiving side control circuit 273. The output impedance calculator 271d calculates and outputs the output impedance Zout based on the equation (2).

Zout = V2 / I2 (2)

  The input impedance target value calculation unit 271e calculates the output impedance Zout output from the output impedance calculation unit 271d, the preset coupling coefficient target value k * between the power transmission winding 211 and the power reception winding 231 and the circuit configuration. This block calculates and outputs an input impedance target value Zin * based on the coefficient α. The input impedance target value calculation unit 271e calculates and outputs the input impedance target value Zin * based on Expression (3).

Zin * = (α / k *) × Zout (3)

Here, the coupling coefficient target value k * is equal to the coupling coefficient k between the power transmission winding 211 and the power reception winding 231 when the vehicle is parked in the parking space (within a predetermined range), as in the first embodiment. It is set to the maximum value of the coupling coefficient k that can be adjusted by rotating the power transmission side pad 21 with the power transmission side pad 21 and the power reception side pad 23 being the farthest apart.

  The drive command calculation unit 271f calculates and outputs a drive command based on the comparison result between the input impedance target value Zin * output from the input impedance target value calculation unit 271e and the input impedance Zin output from the input impedance calculation unit 271c. It is. Specifically, this is a block that performs proportional and integral calculations on the deviation between the input impedance target value Zin * and the input impedance Zin and outputs it as a drive command.

  Next, the operation of the non-contact power feeding device according to the second embodiment will be described with reference to FIGS. Since operations other than the rotation of the power transmission side pad are the same as those in the first embodiment, the description thereof is omitted. The rotation operation of the power transmission side pad will be described.

  When the vehicle is parked in the parking space, the relative position of the power receiving side pad 23 with respect to the power transmitting side pad 21 shown in FIG. 17 is determined. The power transmission winding 211 and the power reception winding 231 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 non-contact power feeding device 2 starts operation.

  As shown in FIG. 19, the power transmission side control circuit 271 determines whether or not a charge completion command for the in-vehicle battery B2 is input from the outside (S200).

  If it is determined in step S200 that a charging completion command has been input, the power transmission side control circuit 271 ends the charging of the in-vehicle battery B2. On the other hand, if it is determined in step S200 that the charging completion command has not been input, the power transmission side control circuit 271 acquires the output voltage V1 and the output current I1 of the power transmission circuit 20 (S201). Then, the input impedance Zin is calculated based on the acquired output voltage V1 and output current I1 (S202).

  Moreover, the power transmission side control circuit 271 acquires the output voltage V2 and the output current I2 of the power receiving circuit 25 (S203). Then, the input impedance target value Zin * is calculated based on the output impedance Zout calculated based on the acquired output voltage V2 and output current I2, the preset coupling coefficient target value k *, and the calculation coefficient α (S204). .

  Thereafter, the power transmission side control circuit 271 determines whether or not the input impedance Zin matches the input impedance target value Zin * (S205).

  If it is determined in step S205 that the input impedance Zin does not match the input impedance target value Zin *, the power transmission side control circuit 271 outputs a drive command and rotates the power transmission side pad 21 (S206). On the other hand, if it is determined in step S205 that the input impedance Zin matches the input impedance target value Zin *, and after step S206 is performed, the process returns to step S200.

  The power transmission side control circuit 271 and the power reception side control circuit 273 illustrated in FIG. 17 control the power transmission circuit 20 and the power reception circuit 25 under preset conditions in order to obtain the input impedance Zin and the output impedance Zout. The power transmission circuit 20 converts alternating current supplied from the commercial power supply AC2 into high-frequency alternating current, and supplies the high-frequency alternating current to the power transmission winding 211 to which the power transmission side immittance conversion circuit 28 and the power transmission side resonance capacitor 22 are connected. The power receiving circuit 25 converts the alternating current supplied from the power receiving winding 231 connected to the power receiving side resonance capacitor 24 via the power receiving side immittance conversion circuit 29 into a direct current and supplies the direct current to the in-vehicle battery B2.

  The input impedance calculator 271c shown in FIG. 18 calculates and outputs the input impedance Zin based on the output voltage V1 and the output current I1 of the power transmission circuit 20. The output impedance calculator 271d calculates and outputs the output impedance Zout of the power receiving circuit 25 based on the output voltage V2 and the output current I2 of the power receiving circuit 25. The input impedance target value calculation unit 271e calculates and outputs the input impedance target value Zin * based on the output impedance Zout, the preset coupling coefficient target value k *, and the calculation coefficient α. The drive command calculation unit 271f performs proportional and integral calculations on the deviation between the input impedance target value Zin * and the input impedance Zin, and outputs it as a drive command.

  The drive circuit 262 shown in FIG. 17 rotates the motor 261 based on the drive command input from the power transmission side control circuit 271. When the motor 261 rotates, the turntable 260 rotates, and the power transmission side pad 21 rotates accordingly. As a result, the coupling coefficient k changes, and the input impedance Zin changes accordingly.

  Then, by repeating these operations, the input impedance Zin is finally adjusted to the input impedance target value Zin *. That is, when the vehicle is parked in the parking space, the coupling coefficient k that can be adjusted by rotating the power transmission side pad 21 with the power transmission side pad 21 and the power reception side pad 23 being the farthest away from each other. It is adjusted to a value corresponding to the maximum value of. Even if the relative position of the power receiving side pad 23 with respect to the power transmitting side pad 21 changes due to the difference in the parking position of the vehicle in the parking space, the input impedance Zin is similarly adjusted to the input impedance target value Zin *.

  By the way, as explained in the first embodiment, when the power transmission side resonance capacitor 22 and the power reception side resonance capacitor 24 are connected in series to the power transmission winding 211 and the power reception winding 231, The input impedance Zin is proportional to the square of the coupling coefficient k, and increases as the power transmission side pad 21 and the power reception side pad 23 are closer, and decreases as they are farther away. However, when the power transmission side immittance conversion circuit 28 and the power reception side immittance conversion circuit 29 are provided, the input impedance Zin is inversely proportional to the coupling coefficient k and the power transmission side pad 21, as in the non-contact power feeding device 1 of the first embodiment. The power receiving side pad 23 becomes smaller as the power receiving side pad 23 is closer, and becomes larger as the power receiving side pad 23 is farther away. Therefore, compared to the case where the power transmission side immittance conversion circuit 28 and the power reception side immittance conversion circuit 29 are not provided, the current supplied from the power transmission circuit 20 to the subsequent circuit can be suppressed. Therefore, the loss of the non-contact power feeding device 2 can be further suppressed.

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

  According to the second embodiment, by having the same configuration as that of the first embodiment, the same effect as that of the first embodiment corresponding to the same configuration can be obtained.

  According to the second embodiment, the power transmission side control circuit 271 calculates an input impedance Zin, calculates and outputs a drive command based on a comparison result between the input impedance target value Zin * and the calculated input impedance Zin. The drive device 26 displaces the power transmission side pad 21 based on the drive command input from the power transmission side control circuit 271. Therefore, even if the relative position of the power receiving side pad 23 with respect to the power transmitting side pad 21 changes due to the difference in the parking position of the vehicle in the parking space, the power transmission side so that the input impedance Zin corresponding to the coupling coefficient k is constant. The pad 21 can be reliably displaced. That is, the power transmission side pad 21 can be reliably displaced so that the coupling coefficient k is constant.

  According to the second embodiment, the power transmission side control circuit 271 calculates the input impedance Zin based on the expression (1) using the output voltage V1 and the output current I1 of the power transmission circuit 20. Therefore, the input impedance Zin can be obtained reliably.

  According to the second embodiment, the power transmission side control circuit 271 uses the output voltage V2, the output current I2, and the coupling coefficient target value k * of the power receiving circuit 25 to input based on the equations (2) and (3). The impedance target value Zin * is calculated. Therefore, the input impedance target value Zin * can be obtained reliably.

  According to the second embodiment, the non-contact power feeding device 2 includes the power transmission side resonance capacitor 22 and the power reception side resonance capacitor 24. The power transmission side resonance capacitor 22 and the power reception side resonance capacitor 24 are connected in series to the power transmission winding 211 and the power reception winding 231. The power transmission winding 211 connected in series with the power transmission side resonance capacitor 22 and the power reception winding 231 connected in series with the power reception side resonance capacitor 24 do not go through the power transmission side immittance conversion circuit 28 and the power reception side immittance conversion circuit 29. When connected to the power transmission circuit 20 and the power reception circuit 25, the input impedance Zin is proportional to the square of the coupling coefficient k, and decreases as the power transmission side pad 21 and the power reception side pad 23 become closer, and increases as the distance increases. However, the power transmission winding 211 connected in series with the power transmission side resonance capacitor 22 and the power reception winding 231 connected in series with the power reception side resonance capacitor 24 are connected via the power transmission side immittance conversion circuit 28 and the power reception side immittance conversion circuit 29. Are connected to the power transmission circuit 20 and the power reception circuit 25. Therefore, as in the case of the first embodiment, the input impedance Zin is inversely proportional to the coupling coefficient k, and decreases as the power transmission side pad 21 and power reception side pad 23 are closer, and increases as the distance is longer. Therefore, when the input impedance Zin is adjusted so as to become the input impedance target value Zin *, the input impedance Zin increases as in the case of the first embodiment. Thereby, like the case of 1st Embodiment, the electric current supplied to the back | latter stage circuit from the power transmission circuit 20 can reduce, and loss can be suppressed.

  In the first and second embodiments, an example is given in which the ratio of the maximum value to the minimum value of the coupling coefficient k is 1, that is, the power transmission side pad is displaced so that the coupling coefficient is constant. It is not something that can be done. As shown in FIG. 20, the power transmission side pad may be displaced so that the ratio of the maximum value kmax to the minimum value kmin of the coupling coefficient k is less than 2. The power transmission side pad may be displaced so that the coupling coefficient k is within the allowable range.

  In 1st and 2nd embodiment, although the example which adjusts the coupling coefficient k by rotating a power transmission side pad is given, it is not restricted to this. The coupling coefficient k may be adjusted by rotating only the power transmission core, or the coupling coefficient k may be adjusted by rotating only the power transmission winding. Moreover, you may displace to methods other than rotation.

  As shown in FIG. 21, if the power transmission core 110 is formed into a circular shape and the power transmission winding 111 is wound around the power transmission core 110 so as to be relatively rotatable, only the power transmission winding 111 can be rotated. . Therefore, the coupling coefficient k can be adjusted by rotating only the power transmission winding 111. As shown in FIG. 22, if the power transmission core 110 in FIG. 21 is elliptical, only the power transmission core 110 can be rotated, or only the power transmission winding 111 can be rotated. Therefore, the coupling coefficient k can be adjusted by rotating only the power transmission core 110, and the coupling coefficient k can also be adjusted by rotating only the power transmission winding 111. As shown in FIG. 23, if the power transmission winding 111 in FIG. 21 is wound into an elliptical shape, only the power transmission winding 111 can be rotated. Therefore, the coupling coefficient k can be adjusted by rotating only the power transmission winding 111.

  As shown in FIGS. 24 and 25, if a power transmission winding 111 having a square shape when viewed from the axial direction is provided so as to be relatively rotatable along the surface of the square power transmission core 110, only the power transmission core 110 is rotated. It is also possible to rotate only the power transmission winding 111. Therefore, the coupling coefficient k can be adjusted by rotating only the power transmission core 110, and the coupling coefficient k can also be adjusted by rotating only the power transmission winding 111. Since only the power transmission core 110 or only the power transmission winding 111 needs to be rotated, the driving force of the driving device can be reduced. Therefore, the apparatus can be reduced in size. As shown in FIG. 26, the shape of the power transmission winding 111 viewed from the axial direction in FIGS. 24 and 25 may be rectangular, and the shape of the power transmission core 110 may be rectangular. In this case, the change of the coupling coefficient k accompanying the rotation can be increased. Therefore, the adjustment range of the coupling coefficient k can be increased. As shown in FIG. 27, the shape of the power transmission winding 111 viewed from the axial direction in FIGS. 24 and 25 may be a pentagon, and the shape of the power transmission core 110 may be a pentagon. Each shape may be a polygonal shape. As shown in FIG. 28, the shape of the power transmission winding 111 viewed from the axial direction in FIGS. 24 and 25 may be an elliptical shape, and the shape of the power transmission core 110 may be an elliptical shape. In either case, only the power transmission core 110 can be rotated, or only the power transmission winding 111 can be rotated. Therefore, the coupling coefficient k can be adjusted by rotating only the power transmission core 110, and the coupling coefficient k can also be adjusted by rotating only the power transmission winding 111.

  In 1st and 2nd embodiment, although the example which adjusts the coupling coefficient k by rotating a power transmission side pad is given, it is not restricted to this. The coupling coefficient k may be adjusted by rotating the power receiving pad. By making the power receiving side pad the same configuration as the power transmitting side pad described above, the coupling coefficient k can be adjusted by rotating the power receiving side pad. The coupling coefficient k may be adjusted by rotating at least one of the power transmission side pad and the power reception side pad. The coupling coefficient k may be adjusted by displacing at least one of the power transmission side pad and the power reception side pad.

  In 1st and 2nd embodiment, although the example which calculates the coupling coefficient k based on the output voltage V1 and output current I1 of a power transmission circuit is given, it is not restricted to this. The relative position of the power receiving side pad with respect to the power transmitting side pad may be detected, and the coupling coefficient k may be calculated based on the detection result. The coupling coefficient k may be obtained by another known method.

  DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power feeder, 10 ... Power transmission circuit, 11 ... Power transmission side pad, 110 ... Power transmission core (core), 111 ... Power transmission winding (winding), 12 ... Power transmission side resonance capacitor, 13... Power reception side pad, 130... Power reception core (core), 131... Power reception winding (winding), 14. Power receiving circuit, 16 ... Drive device (coupling coefficient adjusting means), 17 ... Control circuit (coupling coefficient adjusting means), 171 ... Power transmission side control circuit, 173 ... Power receiving side control circuit

Claims (16)

A power transmission side pad (11, 21) having a core (110, 210) constituting a magnetic path, and windings (111, 211) that generate magnetic flux when AC is supplied;
A power receiving side pad (13, 23) having a core (130, 230) constituting a magnetic path and a winding (131, 231) that generates an alternating current by interlinking the magnetic flux generated by the power transmitting side pad; ,
A power transmission circuit (10, 20) connected to the winding of the power transmission side pad and supplying alternating current to the winding;
A power receiving circuit (15, 25) that is connected to a winding of the power receiving side pad and a power supply target, converts alternating current supplied from the winding into direct current, and supplies the direct current to the power supply target;
After the relative position of the power receiving side pad with respect to the power transmitting side pad is determined, at least one of the power transmitting side pad and the power receiving side pad is displaced, and the winding of the power transmitting side pad and the winding of the power receiving side pad Coupling coefficient adjusting means (16, 17, 26, 27) for adjusting the coupling coefficient;
In a non-contact power feeding device with
When the power transmission side pad and the power reception side pad are within a predetermined range, the minimum value of the coupling coefficient is the power transmission side pad and the power reception side when the power transmission side pad and the power reception side pad are farthest apart. A maximum value of the coupling coefficient that can be adjusted by displacing at least one of the pads;
The coupling coefficient adjusting means may allow the coupling coefficient to be within an allowable range based on a ratio of the maximum value to the minimum value of the coupling coefficient even if the relative position of the power receiving pad with respect to the power transmitting pad changes. non-contact power feeding device characterized by displacing at least one of the power-transmitting-side pad and the power-receiving-side pad. A power transmission side pad ( 21 ) having a core ( 210 ) constituting a magnetic path and a winding ( 211 ) that generates a magnetic flux by being supplied with an alternating current;
A power receiving side pad ( 23 ) having a core ( 230 ) constituting a magnetic path, and a winding ( 231 ) that generates an alternating current by linking the magnetic flux generated by the power transmitting side pad;
A power transmission circuit ( 20 ) connected to the winding of the power transmission side pad and supplying alternating current to the winding;
A power receiving circuit ( 25 ) connected to the winding of the power receiving side pad and a power supply target, converting alternating current supplied from the winding to direct current and supplying the direct current to the power supply target;
After the relative position of the power receiving side pad with respect to the power transmitting side pad is determined, at least one of the power transmitting side pad and the power receiving side pad is displaced, and the winding of the power transmitting side pad and the winding of the power receiving side pad Coupling coefficient adjusting means ( 26, 27 ) for adjusting the coupling coefficient;
In a non-contact power feeding device with
The coupling coefficient adjusting unit obtains an input impedance of a subsequent circuit of the power transmission circuit, and changes a relative position of the power receiving side pad with respect to the power transmission side pad based on a comparison result between the input impedance target value and the obtained input impedance. Even so, at least one of the power transmission side pad and the power reception side pad is displaced so that the coupling coefficient falls within an allowable range.   2. The coupling coefficient adjusting unit displaces at least one of the power transmission side pad and the power reception side pad so that a ratio of a maximum value to a minimum value of the coupling coefficient is less than 2. The non-contact electric power feeder of description. The said coupling coefficient adjustment means displaces at least any one of the said power transmission side pad and the said power receiving side pad so that ratio of the maximum value with respect to the minimum value of the said coupling coefficient may be set to 1. Non-contact power feeding device. The coupling coefficient adjusting means (16, 17) obtains the coupling coefficient, and displaces at least one of the power transmission side pad and the power receiving side pad based on a comparison result between the coupling coefficient target value and the obtained coupling coefficient. The non-contact electric power feeder of any one of Claims 1, 3, or 4 characterized by the above-mentioned. The coupling coefficient adjusting means (26, 27) calculates an input impedance of a subsequent circuit of the power transmission circuit, and based on a comparison result between the input impedance target value and the calculated input impedance, the power transmission side pad and the power reception side pad. 5. The contactless power supply device according to claim 1, wherein at least one of them is displaced. 6. The contactless power feeding device according to claim 2, wherein the coupling coefficient adjusting unit obtains the input impedance based on an output voltage and an output current of the power transmission circuit. The said coupling coefficient adjustment means calculates | requires the said input impedance target value based on the output voltage of the said receiving circuit, output current, and a coupling coefficient target value, The any one of Claim 2, 6 or 7 characterized by the above-mentioned. The non-contact electric power feeder as described in. A power transmission side resonance capacitor (12) connected in parallel to the winding of the power transmission side pad and forming a resonance circuit together with the winding;
A power-receiving-side resonance capacitor (14) connected to the winding of the power-receiving-side pad and forming a resonance circuit together with the winding;
The contactless power feeding device according to claim 1, wherein the contactless power feeding device is provided. A power transmission side resonance capacitor (22) connected in series to the winding of the power transmission side pad and constituting a resonance circuit together with the winding;
A power-receiving-side resonance capacitor (24) connected in series to the winding of the power-receiving-side pad and constituting a resonance circuit together with the winding;
A power transmission side immittance conversion circuit (28) connected between windings of the power transmission side pad connected in series with the power transmission circuit and the power transmission side resonance capacitor;
A power receiving side immittance conversion circuit (29) connected between the power receiving side winding of the power receiving side resonance capacitor connected in series and the power receiving circuit;
The contactless power feeding device according to claim 1, wherein the contactless power feeding device is provided.   The said coupling coefficient adjustment means adjusts the said coupling coefficient by rotating at least any one of the said power transmission side pad and the said power receiving side pad, The non-requirement of any one of Claims 1-10 characterized by the above-mentioned. Contact power supply device.   The said coupling coefficient adjustment means adjusts the said coupling coefficient by rotating the winding of at least any one of the said power transmission side pad and the said power receiving side pad, The any one of Claims 1-10 characterized by the above-mentioned. The non-contact electric power feeder of description.   The said coupling coefficient adjustment means adjusts the said coupling coefficient by rotating the core of at least any one of the said power transmission side pad and the said power receiving side pad, The Claim 1 characterized by the above-mentioned. Non-contact power feeding device.   14. The contactless power supply device according to claim 12, wherein at least one of the power transmission side pad and the power reception side pad is wound around a core so as to be relatively rotatable.   The contactless power feeding device according to claim 12 or 13, wherein at least one of the windings of the power transmission side pad and the power reception side pad is provided so as to be relatively rotatable along the surface of the core. .   The winding of the power transmission side pad and the power reception side pad has at least one of a circular shape, an elliptical shape, and a polygonal shape as viewed from the axial direction. The non-contact electric power feeder as described in.

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