JP2016226236A - Non-contact power supply device and non-contact power reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide non-contact power supply and power reception devices capable of detecting, only at one side, mutual approach or positional displacement of the non-contact power supply and power reception devices.SOLUTION: Within a plane of a central cross-sectional face including a central axis of a power supply coil, a detection coil is provided of which the winding shaft is disposed in a direction vertical to the central cross-sectional face. The detection coil is disposed so as to include the power supply coil within a coil loop of the detection coil and comprises: electromotive force detection means for detecting a strength of an electromotive voltage that is generated in the detection coil; phase difference detection means for detecting a phase difference between a phase of a voltage supplied to the power supply coil and a phase of the electromotive voltage generated in the detection coil; positional displacement detection means which makes a threshold determination on the strength of the electromotive voltage detected by the electromotive force detection means, and discriminates the presence/absence of the positional displacement of a power reception coil; and positional displacement direction detection means for detecting a positional displacement direction in a direction of a central axis of the detection coil from the phase difference.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a non-contact power feeding device and a non-contact power receiving device used in a non-contact power feeding system that performs wireless power feeding by electromagnetic coupling, and in particular, proximity and position between the non-contact power feeding device and the non-contact power receiving device. The present invention relates to a non-contact power feeding device and a non-contact power receiving device capable of detecting a shift.

  As a foreign matter detection technique such as a metallic foreign matter in the non-contact power feeding system, for example, those described in Patent Documents 1 and 2 are known.

  In the wireless power transmission device described in Patent Document 1 (see FIGS. 3 to 8 of Non-Patent Document 1, Claim 1, Paragraphs [0046]-[0080]), both sides of the feeding coil (first self-resonant coil) are provided. The foreign substance detection first self-resonance coil and the foreign substance detection second self-resonance coil are arranged in the same direction as the power supply coil, and the foreign substance detection second self The high frequency energy E1 having a resonance frequency that resonates with the resonance coil is supplied, and the energy E2 of the alternating current induced in the second self-resonance coil for foreign matter detection is detected to obtain the energy transmission efficiency P1 = E2 / E1 between the two. When the transmission efficiency P1 is equal to or less than a predetermined threshold, foreign matter detection is performed by determining that foreign matter is present.

  In the non-contact power transmission system described in Patent Document 2 (see paragraphs [0036]-[0037] of Patent Document 2, FIGS. 5 and 6), a power supply coil (primary coil), a cover that covers the power supply coil, And a sensor coil for detecting an object existing around the cover, and the winding axis of the sensor coil is arranged so as to be substantially orthogonal to the winding axis of the power feeding coil. The sensor coil is arranged such that the magnetic flux generated by the power supply coil and the magnetic flux generated by the sensor coil are orthogonal to each other so as to wind the power supply coil and the core of the power supply coil. In this configuration, when foreign matter is present on the cover, the impedance around the sensor coil changes, and the resonance frequency of the sensor coil shifts. Therefore, foreign matter detection is performed by detecting a shift in the resonance frequency of the sensor coil. In addition, since the winding axis of the sensor coil is substantially orthogonal to the winding axis of the power feeding coil, interference between both the coils is suppressed and the accuracy of foreign object detection is improved.

  On the other hand, in the non-contact power supply system, for example, the techniques described in Patent Documents 3 and 4 are known as techniques for detecting the proximity and displacement of the non-contact power supply apparatus and the non-contact power reception apparatus.

  Patent Document 3 (see claims 1, FIG. 1, FIG. 17, paragraphs [0039], [0044]-[0046] of Patent Document 3) describes a feeding coil (1), a receiving coil (7), and a receiving capacitor. (8) A wireless power feeding device that supplies power to a wireless power receiving device having a power receiving resonance circuit in a contactless manner, and includes a power feeding coil (1) and a resonance current detector that detects a resonance current of the power receiving resonance circuit ( 6) and by supplying an alternating current to the feeding coil (1), power is supplied from the feeding coil (1) to the receiving coil (7) based on the magnetic resonance phenomenon between the feeding coil (1) and the receiving coil (7). And a control circuit (111) for associating the frequency of the alternating current with the frequency of the resonant current detected by the resonant current detector, wherein the feeding coil (1) is substantially resonant. circuit Without being configured, the resonance current detector (6) has a detection resonance circuit including a detection coil (6a) and a detection capacitor (6c), and a magnetic field resonance phenomenon between the detection coil (6a) and the power reception coil (7). And the winding region of the detection coil (6a) is smaller than the winding region of the feeding coil (1), and the winding center axis of the detection coil (6a) is the feeding coil. There is described a wireless power supply apparatus arranged to form an angle of 80 ° to 100 ° with respect to the magnetic field vector generated by (1). When the power receiving coil (7) approaches the power feeding coil (1), a resonance current is induced in the power receiving coil (7). At this time, the detection resonance circuit including the detection coil (6a) and the detection capacitor (6c) resonates due to the resonance current, and the resonance current induced in the detection resonance circuit is detected. The approach of the coil (7) can be detected.

  Patent Document 4 (see FIGS. 1-3 and paragraphs [0040]-[0049] of Patent Document 4) includes a power receiving device (20) having a power receiving coil (103) installed in a moving body, and a power receiving coil (103). A power transmission device (10) having a power transmission coil (102) for supplying power in a non-contact manner, and a plurality of loop antenna elements that are arranged in the vicinity of the power transmission coil (102) and whose loop axes are orthogonal to each other. A first antenna (301) and a second antenna having a plurality of loop antenna elements (near the receiving coil (102)) and having a plurality of loop antenna elements in which the coil axis directions of the receiving coil (102) substantially coincide with each other. 304) and the reception magnetic field by the plurality of loop antenna elements of the first antenna (301), the relative relationship between the power transmission coil (102) and the power reception coil (103) Wireless power transmission system and a position calculating means for obtaining a location relationship (308) is described.

JP2012-75200A JP 2013-215073 A Japanese Patent No. 5522271 JP 2012-5308 A

  In the non-contact power feeding systems described in Patent Literatures 1, 2, and 3, it is possible to detect the approach of a foreign object or a power receiving coil, but has the non-contact power receiving device approached a predetermined position for power feeding? It is not possible to detect whether or not.

  On the other hand, in the non-contact power feeding system described in Patent Document 4, the first antenna (301) on the non-contact power feeding apparatus side and the second antenna (304) on the non-contact power receiving apparatus side are used. Since the position of the contact power receiving device can be specified, it is possible to detect whether or not the non-contact power receiving device has approached a predetermined position for power feeding. However, the precondition is that the non-contact power receiving device side is provided with the second antenna (304), and the detection mechanism is not closed on one side of the non-contact power feeding device or the non-contact power receiving device. . Therefore, there is a problem of lack of versatility.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a non-contact power feeding device capable of detecting the proximity of the non-contact power feeding device and the non-contact power receiving device and the positional displacement of each other only on one side of the non-contact power feeding device or the non-contact power receiving device. And providing a non-contact power receiving apparatus.

A first configuration of a non-contact power feeding device according to the present invention includes a non-contact power feeding device including a power feeding coil to which AC power is fed, and a detachably attached to the power feeding coil, and resonates with the power feeding coil. A non-contact power feeding device used in a non-contact power feeding system including a non-contact power receiving device including a power receiving coil that receives power supply from the power feeding coil,
A first detection coil having a winding axis disposed in a direction perpendicular to the first central cross section in a plane of a first central cross section that is a plane including the central axis of the power supply coil; ,
The first detection coil is disposed so as to enclose the feeding coil in a coil ring of the first detection coil,
First electromotive force detection means for detecting the intensity of an electromotive voltage or an electromotive current generated in the first detection coil;
First phase difference detection means for detecting a phase difference between the phase of the voltage or current supplied to the power supply coil and the phase of the electromotive voltage or current generated in the first detection coil;
A displacement detection means for determining the presence or absence of displacement of the power receiving coil with respect to the power feeding coil by determining a threshold value of the intensity of the electromotive voltage or current detected by the first electromotive force detection means;
First misalignment direction detecting means for detecting the misalignment direction of the first detection coil in the central axis direction (hereinafter referred to as “x-axis direction”) based on the phase difference detected by the first phase difference detecting means. And.

  According to this configuration, when the power receiving coil is in the vicinity of the power feeding coil and is coaxial with the power feeding coil (hereinafter, this position is referred to as “directly above position”), an electromotive voltage generated in the first detection coil (or (Electromotive current) is minimum (substantially zero). When the position of the power receiving coil is shifted from the position directly above the power feeding coil in the x-axis direction, an electromotive voltage (or electromotive current) is generated in the first detection coil. At this time, the phase of the electromotive voltage (or electromotive current) generated in the first detection coil is shifted by 90 degrees with respect to the phase of the voltage (or current) supplied to the power feeding coil. Further, whether the phase of the electromotive voltage (or electromotive current) is advanced by 90 degrees or delayed by 90 degrees is determined depending on whether it is shifted in the positive direction or the negative direction in the x-axis direction. Accordingly, the magnitude of the electromotive voltage (or electromotive current) is detected by the first electromotive force detection means, and the position deviation detection means determines the threshold value to determine whether or not the power reception coil is misaligned with respect to the power feeding coil. Can be determined. Further, the first phase difference detecting means detects the phase difference of the phase of the electromotive voltage (or electromotive current) with respect to the phase of the voltage (or current) supplied to the power supply coil, and the first position shift direction detecting means By detecting the misalignment direction based on whether the phase difference is positive or negative, it is possible to detect the occurrence of misalignment and the misalignment direction along the x-axis.

A second configuration of the non-contact power feeding device according to the present invention is the second center in the first configuration, which includes a central axis of the feeding coil and is a plane perpendicular to the first central cross section. A second detection coil disposed in a plane of the cross section in a direction in which the winding axis is perpendicular to the second central cross section;
The second detection coil is disposed so as to enclose the feeding coil in a coil ring of the second detection coil,
Second electromotive force detection means for detecting the intensity of an electromotive voltage or an electromotive current generated in the second detection coil;
Second phase difference detection means for detecting a phase difference between the phase of the voltage or current supplied to the power supply coil and the phase of the electromotive voltage or current generated in the second detection coil;
A displacement detection means for determining the presence / absence of displacement of the power receiving coil with respect to the power feeding coil by determining a threshold value of the intensity of the electromotive voltage or current detected by the second electromotive force detection means;
Second misalignment direction detecting means for detecting the misalignment direction of the second detection coil in the central axis direction (hereinafter referred to as “y-axis direction”) based on the phase difference detected by the second phase difference detecting means. And.

  As a result, it is possible to generate a positional shift in both the x-axis direction and the y-axis direction and detect the direction in the two-dimensional plane.

A third configuration of the non-contact power feeding device according to the present invention is the configuration of the first or second configuration, in which the winding shaft is not close to the side of the power feeding coil and the power receiving coil is not close to the power feeding coil. A third detection coil disposed in a direction perpendicular to the magnetic flux produced by the feeding coil in a state;
Third phase difference detection means for detecting a phase difference between the phase of the voltage or current supplied to the feeding coil and the phase of the electromotive voltage or current generated in the third detection coil;
Resonance frequency control means for controlling the frequency of the voltage or current supplied to the power supply coil so that the phase difference detected by the third phase difference detection means becomes a predetermined value. And

  According to this configuration, when there is no power receiving coil in the vicinity of the power supply coil, the induced voltage (or induced current) generated in the third detection coil when the alternating current is supplied to the power supply coil is substantially zero. . On the other hand, when the power receiving coil approaches the vicinity of the power feeding coil, an induced voltage (or induced current) is generated in the third detection coil. At this time, when the frequency of the alternating current applied to the power supply coil matches the resonance frequency between the power supply coil and the power receiving coil, the phase of the alternating voltage (or alternating current) applied to the power supply coil and the third detection are detected. The phase difference from the phase of the induced voltage (or induced current) induced in the coil is 90 degrees. However, when the frequency of the alternating voltage (or alternating current) energized in the power supply coil is slightly deviated from the resonance frequency, the phase difference is shifted from 90 degrees according to the amount of deviation. Accordingly, the phase of the induced voltage (or induced current) is detected by the third phase difference detection means, and the power is fed so that the phase difference becomes a predetermined value (absolute value is 90 degrees) by the resonance frequency control means. By controlling the frequency of the voltage or current supplied to the coil, it is possible to automatically match the frequency of the alternating voltage (or alternating current) energized to the power supply coil to the resonance frequency and maximize the power transmission efficiency. .

According to a fourth configuration of the non-contact power feeding device of the present invention, in the third configuration, a third electromotive force detecting means for detecting an intensity of an electromotive voltage or an electromotive current generated in the third detection coil. When,
Presence / absence detecting means for determining whether or not the power receiving coil is present in the vicinity of the power supply coil by determining a threshold value of the intensity of the electromotive voltage or electromotive current detected by the third electromotive force detecting means. It is characterized by that.

  According to this configuration, the third electromotive force detection means detects the intensity of the electromotive voltage or electromotive current generated in the third detection coil, and the presence / absence detection means determines the threshold value so that the vicinity of the feeding coil It is possible to detect whether or not there is a power receiving coil.

A first configuration of a contactless power receiving device according to the present invention includes a contactless power supply device including a power supply coil to which AC power is supplied, and a detachable attachment to the power supply coil, and resonates with the power supply coil. A non-contact power receiving device used in a non-contact power feeding system including a non-contact power receiving device including a power receiving coil that receives power supply from the power feeding coil,
A first detection coil having a winding axis disposed in a direction perpendicular to the first central cross section in a plane of a first central cross section that is a plane including the central axis of the power receiving coil; ,
The first detection coil is disposed so as to enclose the power receiving coil in a coil ring of the first detection coil,
First electromotive force detection means for detecting the intensity of an electromotive voltage or an electromotive current generated in the first detection coil;
First phase difference detection for detecting a phase difference between a phase of voltage or current induced in the power receiving coil by an alternating magnetic field generated by the power feeding coil and a phase of electromotive voltage or current generated in the first detection coil Means,
A first misalignment detecting means for determining the presence or absence of misalignment of the power receiving coil with respect to the power feeding coil by determining a threshold value of the intensity of the electromotive voltage or current detected by the first electromotive force detecting means;
A first position for detecting a displacement direction and a displacement amount in a central axis direction (hereinafter referred to as “x-axis direction”) of the first detection coil based on a phase difference detected by the first phase difference detection unit. And a deviation direction detecting means.

  With this configuration, it is possible to detect the occurrence of misalignment between the power feeding coil and the power receiving coil and the direction of misalignment along the x axis on the non-contact power receiving device side.

A second configuration of the non-contact power receiving device according to the present invention is the second center in the first configuration, which includes a central axis of the power receiving coil and is a plane perpendicular to the first central cross section. A second detection coil disposed in a plane of the cross section in a direction in which the winding axis is perpendicular to the second central cross section;
The second detection coil is disposed so as to enclose the power receiving coil in a coil ring of the second detection coil,
Second electromotive force detection means for detecting the intensity of an electromotive voltage or an electromotive current generated in the second detection coil;
Second phase difference detection for detecting a phase difference between the phase of the voltage or current induced in the power receiving coil by the alternating magnetic field generated by the power feeding coil and the phase of the electromotive voltage or current generated in the second detection coil. Means,
A second misalignment detecting means for determining whether or not the power receiving coil is misaligned with respect to the power feeding coil by determining a threshold value of the intensity of the electromotive voltage or electromotive current detected by the second electromotive force detecting means;
A second position for detecting a displacement direction and a displacement amount in the central axis direction (hereinafter referred to as “y-axis direction”) of the second detection coil based on the phase difference detected by the second phase difference detection unit. And a deviation amount detecting means.

  With this configuration, it is possible to detect the occurrence of misalignment between the power feeding coil and the power receiving coil and the direction of misalignment along the x axis and the y axis on the non-contact power receiving device side.

  As described above, according to the non-contact power feeding device according to the present invention, even if no detection mechanism is particularly provided on the non-contact power receiving device side, only the non-contact power feeding device side can contact the non-contact power receiving device near the power feeding coil. It is possible to detect whether or not the power receiving coil of the apparatus has approached, and to detect the position shift and the position shift direction. Further, by providing the third phase difference detection means and the resonance frequency control means, even if the resonance frequency changes due to aging deterioration of the power supply coil or the power reception coil, the alternating current that energizes the power supply coil following the change. The frequency of the current is automatically adjusted to the resonance frequency, and the power transmission efficiency can be maximized.

  Moreover, according to the non-contact power receiving device according to the present invention, even if the detection mechanism is not particularly provided on the non-contact power feeding device side, the positional deviation and position of the power receiving coil with respect to the power feeding coil can be provided only from the non-contact power receiving device side. It is possible to detect the shift direction.

It is a block diagram showing the structure of the non-contact electric power feeding system which concerns on Example 1 of this invention. It is a schematic diagram which shows the feed coil assembly 6 in FIG. FIG. 3 is a diagram illustrating an example of a magnetic field created around the feeding coil 3 when the feeding coil 3 is energized in a state where the receiving coil 30 is not in the vicinity of the feeding coil 3. FIG. 4 is a schematic diagram illustrating changes in magnetic fields formed in the vicinity of both coils when the power receiving coil 30 of the non-contact power receiving device 2 approaches the power feeding coil 3 of the non-contact power feeding device 1. It is a perspective view of the feeding coil assembly 6 used in the measurement experiment of the electromotive voltage. It is a figure showing the positional relationship of the feeding coil assembly 6 and the receiving coil 30 in the measurement experiment of an electromotive voltage. 6 shows voltage waveforms of the feeding coil 3, the receiving coil 30, and the detection coil 4 at the measurement positions B and C in FIG. 3 is a flowchart illustrating a positional deviation correction control operation of a movement control circuit 17 of the non-contact power feeding device 1 of FIG. It is a block diagram showing the structure of the non-contact electric power feeding system which concerns on Example 2 of this invention. FIG. 10 is a schematic diagram showing a feeding coil assembly 6 in FIG. 9. It is a figure showing the example of a concrete structure of the feed coil 3 and detection coil 4a, 4b of FIG. It is a block diagram showing the structure of the non-contact electric power feeding system which concerns on Example 3 of this invention. It is a schematic diagram which shows the feed coil assembly 6 in FIG. 13 is a flowchart showing a positional deviation correction control operation of a movement control circuit 17 of the contactless power supply device 1 of FIG. 12 and an energization mode switching operation of an energization control circuit 12. It is a block diagram showing the structure of the non-contact electric power feeding system which concerns on Example 4 of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration of a non-contact power feeding system according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing the arrangement of the feeding coil 3 and the detection coil 4 in FIG. The non-contact power feeding system of this embodiment includes a non-contact power feeding device 1 and a non-contact power receiving device 2.

  The non-contact power supply apparatus 1 includes a power supply coil assembly 6 including a power supply coil 3 and a detection coil 4, a motor 7, a power supply circuit 10, an oscillation circuit 11, an energization control circuit 12, an electromotive force detection circuit 13, a misregistration detection circuit 16, A movement control circuit 17, a phase difference detection circuit 18, and a positional deviation direction detection circuit 19 are provided.

  As shown in FIG. 2, the power supply coil assembly 6 includes a power supply coil 3 and a detection coil 4 that are integrated. The power feeding coil 3 is a coil that is fed with an alternating current and performs non-contact power transmission to the non-contact power receiving device 2. Usually, a cored coil as shown in FIG. In FIG. 2, the feeding coil 3 is a cylindrical coil and the feeding coil core 3a is a cylindrical core for the sake of clarity, but in the present invention, the feeding coil 3 and the feeding coil core are used. The shape of 3a is not limited to this, For example, you may use a square cylinder type coil. As will be described later, in order to facilitate the detection of the displacement amount of the non-contact power receiving device 2, the shapes of the feeding coil 3 and the core 3a of the feeding coil are symmetrical with respect to a plane passing through the central axis. The shape is preferable.

  Here, as shown in FIG. 2, the central axis of the feeding coil 3 is L0, one plane including the central axis L0 passes through the first central cross section S1, the central point O of the feeding coil 3, and the first center. A coordinate axis perpendicular to the cross section S1 is an x axis, and a coordinate axis passing through the center point O of the feeding coil 3 and in the plane of the first central cross section S1 is a y axis.

  The detection coil 4 is a coil that is disposed so as to enclose the power feeding coil 3 in the coil ring, and detects the approach and displacement direction and the displacement amount of the non-contact power receiving device 2. The detection coil 4 is disposed at a position where the induced current is minimized when there is no power receiving coil 30 (described later) of the non-contact power receiving device 2. Specifically, for example, when the feeding coil 3 is a cylindrical coil as shown in FIG. 2, the detection coil 4 is disposed in the first central cross section S1, and the winding axis thereof is the first central cross section S1. Are arranged so as to be perpendicular to (x-axis direction).

  FIG. 3 is a diagram illustrating an example of a magnetic field created around the power feeding coil 3 when the power feeding coil 3 is energized in a state where the power receiving coil 30 is not in the vicinity of the power feeding coil 3. FIG. 3 is an explanatory diagram. In FIG. 3, the feeding coil 3 is a cored cylindrical coil, and an object (a casing or the like) around the feeding coil 3 is ignored. A magnetic flux (line of magnetic force) generated by the feeding coil 3 is indicated by a dotted line. In the case of FIG. 3, the magnetic flux generated by the feeding coil is plane-symmetric with respect to the xy plane and rotationally symmetric with respect to the central axis L <b> 0, so that the winding axis of the detection coil 4 is coaxial with the x-axis. Is placed in the first central cross section S1, the current induced in the detection coil 4 is minimized (0 in an ideal case as shown in FIG. 3). In an actual case, the ideal magnetic field distribution as shown in FIG. 3 is not obtained due to the shape of the power supply coil 3 and the influence of an object (casing or the like) arranged around the power supply coil 3, so the orientation of the detection coil 4 is determined. In this case, the induced current may be measured while changing the inclination of the detection coil 4 while the feeding coil 3 is energized, and the angle at which the induced current is minimized may be determined.

  In this embodiment, the non-contact power feeding device 1 includes a slider mechanism (not shown) that translates the power feeding coil assembly 6 in the x-axis direction (left-right direction), and the motor 7 uses the slider mechanism. By driving, the feeding coil assembly 6 is moved in the x-axis direction. The motor 7 is a normal stepping motor.

  The power supply circuit 10 is a direct current stabilized power supply for supplying power to be supplied to the power supply coil 3, power for driving the motor 7, and power for driving other circuits. The oscillation circuit 11 is a circuit that generates an AC voltage having a frequency f when the power feeding coil 3 is energized. The energization control circuit 12 is a circuit that generates an energization current to be supplied to the power feeding coil 3 by modulating a DC current supplied from the power supply circuit 10 with an AC voltage generated by the oscillation circuit 11.

  The electromotive force detection circuit 13 is a circuit that detects the intensity of the electromotive voltage (or electromotive current) generated in the detection coil 4. Since the electromotive voltage (or electromotive current) generated in the detection coil 4 is alternating current, the electromotive force detection circuit 13 includes a rectifier circuit that rectifies the electromotive force detection circuit 13, and the intensity of the electromotive voltage (or electromotive current) of the detection coil 4 is The detected voltage value after rectification (or a voltage value obtained by amplifying it) is output as V4. The positional deviation detection circuit 16 is a circuit that detects the positional deviation amount Δx of the power receiving coil 30 with respect to the power feeding coil 3 from the detection voltage value V4 detected by the electromotive force detection circuit 13.

  The phase difference detection circuit 18 has a phase difference Δφ43 between the phase φ3 of the voltage (or current) output from the energization control circuit 12 to the feeding coil 3 and the phase φ4 of the electromotive voltage (or electromotive current) generated in the detection coil 4. Is a circuit for detecting The positional deviation direction detection circuit 19 is a circuit that determines the positional deviation direction of the power receiving coil 30 with respect to the power feeding coil 3 based on whether the phase difference detected by the phase difference detection circuit 18 is positive or negative.

  The movement control circuit 17 performs drive control of the motor 7 so that the positional deviation amount is minimized based on the positional deviation amount detected by the positional deviation detection circuit 16 and the positional deviation direction detected by the positional deviation direction detection circuit 19. Circuit. The movement control circuit 17 can be configured using a microcomputer or the like.

  On the other hand, the non-contact power receiving device 2 includes a power receiving coil 30, a rectifier circuit 31, and a secondary battery 32. The power receiving coil 30 is a coil that receives magnetic power from the power feeding coil by magnetic resonance with the power feeding coil 2 when the non-contact power feeding device 2 approaches the non-contact power feeding device 1. The rectifier circuit 31 is a circuit that rectifies the induced current generated in the power receiving coil 30. The secondary battery 32 is a battery that is charged by a direct current output from the rectifier circuit 31.

  The operation of the non-contact power feeding system according to the present embodiment configured as described above will be described below.

(1) Relationship between position shift amount / direction of power receiving coil and induced voltage (current) of detection coil FIG. 4 shows the case where the power receiving coil 30 of the non-contact power receiving device 2 approaches the power feeding coil 3 of the non-contact power feeding device 1. It is the schematic diagram showing the change of the magnetic field formed in both coil vicinity. In FIG. 4, the magnetic flux is indicated by a dotted line. In FIG. 4, the power receiving coil 30 is sequentially approaching the power feeding coil 3 in the order of (d), (c), (b), and (a), and FIG. This represents a state of complete resonance. Note that FIG. 4 is an approximation of a DC magnetic field. Actually, the feeding coil 3 and the receiving coil 30 are alternating currents because they are energized with alternating current, and have a magnetic field line distribution slightly different from that in FIG.

  When there is no power receiving coil 30 in the vicinity of the power feeding coil 3, as shown in FIG. 3, the number of flux linkages linked to the detection coil 4 is substantially zero. Therefore, no induced current is generated in the detection coil 4. When the power receiving coil 30 approaches the power feeding coil 3, the magnetic field around the power feeding coil 3 is disturbed by the power receiving coil 30. As shown in FIG. 4, when the power receiving coil 30 approaches the power feeding coil 3, the magnetic field around the power feeding coil 3 is disturbed by the induced current induced in the power receiving coil 30 and the influence of the core of the power receiving coil 30. When the power receiving coil 30 is not coaxial with the power feeding coil 3, the number of interlinkage magnetic fluxes linking the detection coil 4 increases due to magnetic field disturbance by the power receiving coil 30 (FIGS. 4D and 4C). b)). As a result, an induced current is generated in the detection coil 4. When the power receiving coil 30 has a positional relationship that is coaxial with the power feeding coil 3 (FIG. 4A), the magnetic field around the power feeding coil 3 is symmetric with respect to the central axis L0. Accordingly, the number of interlinkage magnetic fluxes interlinking the detection coil 4 is substantially zero, and the induced current generated in the detection coil 4 is also substantially zero. Therefore, by detecting the magnitude of the induced current generated in the detection coil 4, it is possible to detect the amount of displacement of the power receiving coil 30 with respect to the power feeding coil 3.

  Actually, an alternating current was input to the feeding coil 3, and a measurement experiment on the relationship between the position of the power receiving coil 30 and the electromotive voltage of the detection coil 4 was performed. FIG. 5 is a perspective view of the feeding coil assembly 6 used in the experiment. In the experiment, the feeding coil 3 was a cylindrical coil in which a coil wire 3b was wound around the cylinder. The coil core 3a of the feeding coil 3 has a rectangular plate-like bottom plate portion connected to the lower end of a cylindrical central shaft portion that penetrates the coil wire 3b, and further surrounds both sides of the coil wire 3b at the left and right ends of the bottom plate portion. The surrounding wall portion is formed in a protruding shape. FIG. 6 is a diagram (plan view) illustrating a positional relationship between the feeding coil assembly 6 and the receiving coil 30 in an electromotive voltage measurement experiment. 6A shows a state where the power receiving coil 30 is positioned directly above the power feeding coil 3 (coaxial with the central axis L0), and FIG. 6B shows a state where the power receiving coil 30 is positioned shifted to the right side of the power feeding coil 3. FIG. 6C shows a state where the power receiving coil 30 is shifted to the left side of the power feeding coil 3.

  FIG. 7 shows voltage waveforms of the feeding coil 3, the receiving coil 30, and the detection coil 4 at the measurement positions B and C in FIG. 7A shows the voltage waveform when the power receiving coil 30 is placed at the relative position A (FIG. 6A), and FIG. 7B shows the voltage waveform when the power receiving coil 30 is placed at the relative position B (FIG. 6B). FIG. 7C shows the voltage waveform when the power receiving coil 30 is placed at the relative position C (FIG. 6C). 7A to 7C, the waveform of the channel 1 (bottom) is induced in the power supply coil 3, and the waveform of the channel 2 (second from the bottom) is induced in the power receiving coil 30. The voltage waveform and the waveform of the channel 4 (uppermost part) are voltage waveforms induced in the detection coil 4.

  As shown in FIG. 7, when the power receiving coil 30 is coaxial with the power feeding coil 3, no induction voltage is generated in the detection coil 4 (FIG. 7 (a)). That is, the intensity of the induced voltage waveform is minimized. When the power receiving coil 30 is shifted to the left in the x-axis direction, an induced voltage whose phase is advanced by 90 degrees with respect to the voltage waveform input to the power feeding coil 3 is generated in the detection coil 4. Conversely, when the power receiving coil 30 is shifted to the right in the x-axis direction, an induced voltage whose phase is delayed by 90 degrees with respect to the voltage waveform input to the power feeding coil 3 is generated in the detection coil 4. Therefore, by detecting whether the phase of the induced voltage induced in the detection coil 4 with respect to the voltage waveform input to the power supply coil 3 is positive or negative, it is possible to detect the position shift direction of the power reception coil 30 with respect to the power supply coil 3. I understand that.

  Whether the phase of the induced voltage waveform of the detection coil 4 advances or delays with respect to the shift direction of the power receiving coil 30 depends on the winding direction of the power feeding coil 3 and the power receiving coil 30.

(2) Operation of Non-Contact Power Supply Device 1 Next, a specific operation of the positional deviation correction control will be described for the non-contact power supply device 1 of FIG. FIG. 8 is a flowchart showing the positional deviation correction control operation of the movement control circuit 17 of the non-contact power feeding apparatus 1. Here, it is assumed that when the power receiving coil 30 is shifted to the left in the x-axis direction with respect to the power feeding coil 3, an induced voltage whose phase is advanced by 90 degrees is generated in the detection coil 4.

  First, in step S1, the movement control circuit 17 determines whether or not the positional deviation amount Δx detected by the positional deviation detection circuit 16 is larger than a predetermined threshold value ε. If Δx ≦ ε, the determination operation in step S1 is repeated. If Δx> ε, the process proceeds to the next step S2.

  Next, in step S2, the movement control circuit 17 determines whether the phase difference Δφ43 detected by the phase difference detection circuit 18 is positive or negative. Here, when Δφ43 is positive, the movement control circuit 17 rotates the motor 7 by one step in the rotation direction in which the feeding coil assembly 6 moves rightward (S3), and when Δφ43 is negative, the movement control circuit 17 moves. The control circuit 17 rotates the motor 7 by one step in the rotation direction in which the feeding coil assembly 6 moves to the left (S4). And it returns to step S1 again.

  By this operation, the feeding coil assembly 6 is controlled to follow the position of the power receiving coil 30 so that the power feeding coil 3 is positioned immediately below the power receiving coil 30.

  In this embodiment, it is assumed that the deviation in the y direction among the deviations of the power receiving coil 30 with respect to the feeding coil 3 can be ignored. This assumes, for example, the case where the contactless power supply system of the present embodiment is applied to a charger for an electric wheelchair and the electric wheelchair wheel is set on a predetermined rail during charging. In this case, the direction along the rail is taken as the x-axis, and only the positional deviation in the x-axis direction needs to be considered.

  Further, the energization control circuit 12 intermittently energizes the power feeding coil 3 to detect misalignment while adjusting misalignment, and the misalignment amount Δx detected by the misalignment detection circuit 16 is Δx. When ≦ ε, it may be configured to switch to continuously energize.

  FIG. 9 is a block diagram illustrating the configuration of the non-contact power feeding system according to the second embodiment of the present invention. FIG. 10 is a schematic diagram showing the arrangement of the feeding coil 3 and the detection coils 4a and 4b in FIG. FIG. 11 is a diagram illustrating a specific configuration example of the feeding coil 3 and the detection coils 4a and 4b in FIG.

  In the non-contact power feeding system of the present embodiment, compared to the first embodiment, the detection coil 4, the electromotive force detection circuit 13, the misalignment detection circuit 16, the phase difference detection circuit 18, and the misalignment direction detection circuit 19 shown in FIG. Are provided in two (detection coils 4a and 4b, electromotive force detection circuits 13a and 13b, misregistration detection circuits 16a and 16b, phase difference detection circuits 18a and 18b, and misregistration direction detection circuits 19a and 19b in FIG. 9). The detection coils 4a and 4b are arranged orthogonally to each other, and a slider mechanism (not shown) for driving the feeding coil assembly 6 enables parallel movement in the y-axis direction in addition to the x-axis. As the motor 7 for driving the slider mechanism, a motor 7a in the x-axis direction and a motor 7b in the y-axis direction are provided, and the movement control circuit 17 has a positional deviation detection circuit 16 and a positional deviation direction detection. The difference is that the drive control of the two motors 7a and 7b is performed so that the positional deviation amount is minimized based on the positional deviation amount detected by the circuits 19a and 19b and the positional deviation direction in the x-axis and y-axis directions. . The rest is the same as in the first embodiment.

  As shown in FIGS. 10 and 11, the feeding coil assembly 6 of the present embodiment has the feeding coil 3 and the detection coils 4a and 4b integrated therein. As shown in FIG. 10, the feeding coil 3 has a central axis L0, a plane including the central axis L0 as a first central cross section S1, and a plane including the central axis L0 and perpendicular to the first central cross section S1. The second central cross section S2, the coordinate axis passing through the central point O of the feeding coil 3 and perpendicular to the first central transverse section S1, the x axis, the central axis O of the feeding coil 3 and the second central cross section S2 The coordinate axis perpendicular to is the y axis.

  The detection coils 4a and 4b are arranged orthogonally to each other so as to enclose the power feeding coil 3 in the coil ring, and the induction current is minimum when there is no power receiving coil 30 (described later) of the non-contact power receiving device 2. It is arranged at the position. Specifically, when the feeding coil 3 is a cylindrical coil as shown in FIG. 10, the detection coil 4a is arranged in the first central cross section S1 as in the case of the detection coil 4 of the first embodiment, and its winding The axes are oriented so that they are oriented perpendicular to the first central cross section S1 (x-axis direction). The detection coil 4b is disposed in the second central cross section S2, and is oriented so that its winding axis is in a direction (y-axis direction) perpendicular to the second central cross section S2.

  In the present invention, the shape of the feeding coil 3 and the core 3a of the feeding coil is not limited to this, and for example, a square tube coil or the like may be used. As will be described later, in order to facilitate the detection of the displacement amount of the non-contact power receiving device 2, the shapes of the feeding coil 3 and the core 3a of the feeding coil are symmetrical with respect to a plane passing through the central axis. The shape is preferable.

  Thus, in the non-contact power feeding system of the present embodiment, the two detection coils 4a and 4b that are orthogonal to each other are provided, so that the x-axis direction component of the positional deviation of the power receiving coil 30 with respect to the power feeding coil 3 and the y-axis direction. The component can be detected. Then, based on the positional deviation amounts and directions in the two directions (x-axis direction and y-axis direction) detected by the positional deviation detection circuits 16a and 16b and the positional deviation direction detection circuits 19a and 19b, the movement control circuit 17 operates the motors 7a and 7b. To control the position of the feeding coil assembly 6 in two directions, and the feeding coil 3 can be moved to an optimum position to feed power. The control operation of the movement control circuit 17 is performed independently in each of the x-axis direction and the y-axis direction, and may be performed in the same process as that described in FIG. .

  FIG. 12 is a block diagram illustrating a configuration of a non-contact power feeding system according to Embodiment 3 of the present invention. FIG. 13 is a schematic diagram showing the feeding coil assembly 6 in FIG. In the present embodiment, the configuration of the non-contact power receiving device 2 is the same as in the first and second embodiments. Moreover, about the non-contact electric power feeder 1, the same code | symbol is attached | subjected about the part similar to Example 2. FIG. Compared with the second embodiment, the non-contact power feeding device 1 according to the present embodiment is different in that it includes a detection coil 5, an electromotive force detection circuit 13c, a phase difference detection circuit 18c, and a resonance frequency control circuit 20.

  As shown in FIG. 13, the power supply coil assembly 6 of the present embodiment is arranged close to the side of the power supply coil 3 in addition to the two detection coils 4 a and 4 b arranged orthogonally described in the second embodiment. The detection coil 5 is coaxial with the detection coil 4b. Here, the winding axis of the detection coil 5 is oriented in a direction perpendicular to the magnetic flux generated by the power supply coil 3 in the state where the power reception coil 30 does not exist in the vicinity of the power supply coil 3. Therefore, when there is no power receiving coil 30 in the vicinity of the power feeding coil 3, the number of magnetic fluxes interlinking the detection coil 5 out of the magnetic flux generated by the power feeding coil 3 is substantially 0, and the detection coil 5 has an electromotive voltage (or (Electromotive current) does not occur.

  On the other hand, when the power receiving coil 30 approaches the vicinity of the power feeding coil 3, the magnetic field around the power feeding coil 3 is disturbed by the influence of the power receiving coil 30 (see FIG. 4), so the number of magnetic fluxes interlinking the detection coil 5 is zero. Is not. Therefore, an electromotive voltage (or electromotive current) is generated in the detection coil 5. When the power receiving coil 30 approaches a position that is coaxial with the power feeding coil 3 directly above the power feeding coil 3, as described in the first and second embodiments, the electromotive voltages (or electromotive currents) of the detection coils 4a and 4b are substantially 0. It becomes. On the other hand, since the detection coil 5 is offset from the center O of the power feeding coil 3, the number of magnetic fluxes interlinking the detection coil 5 is not 0, and an electromotive voltage (or electromotive current) is generated. The phase φ5 of this electromotive voltage (or electromotive current) is energized to the feeding coil 3 in an ideal case (when the energizing frequency of the feeding coil 3 matches the resonance frequency between the feeding coil 3 and the receiving coil 30). The phase is just 90 degrees shifted from the phase φ3 of the current to be generated.

  Accordingly, by determining whether or not the detected voltage value (or a voltage value obtained by amplifying it) V5 detected by the electromotive force detection circuit 13c is equal to or greater than the predetermined threshold value Vth5, the power receiving coil 30 is in the vicinity of the power feeding coil 3. It can be determined whether or not the vehicle has approached.

  In an actual non-contact power supply system, the inductance of the power supply coil 3 and the power reception coil 30 changes during a long time due to deterioration of the power supply coil 3 and the power reception coil 30 with time. Therefore, the resonance frequency between the power feeding coil 3 and the power receiving coil 30 is deviated from the design value as the usage period becomes longer. As the energization frequency of the feeding coil 3 deviates from the resonance frequency, the absolute value of the phase difference Δφ53 = φ5-φ3 of the phase φ5 of the induced current of the detection coil 5 with respect to the phase φ3 of the energizing current of the feeding coil 3 shifts from 90 degrees. . Therefore, by inspecting the phase difference | Δφ53 |, it is possible to detect a shift in the energization frequency of the power feeding coil 3 with respect to the resonance frequency.

  Therefore, the resonant frequency control circuit 20 determines the frequency of the oscillation circuit 11 based on the phase difference detected by the phase difference detection circuit 18c so that the phase difference between the phase of the induced voltage V5 and the phase of the power supply voltage V3 is 90 degrees. Take control. Specifically, the oscillation circuit 11 is a voltage controlled oscillator (VCO), the phase difference detection circuit 18c is a phase comparator (PC) that outputs the phase difference as a voltage, and the resonance frequency control circuit 19 is an output of the phase comparator. Using a low-pass filter (LPF) that generates a control voltage of the voltage controlled oscillator from VCO, PC, and LPF, a frequency negative feedback circuit (Phase Locked Loop: PLL) may be configured.

  FIG. 14 is a flowchart showing the misalignment correction control operation of the movement control circuit 17 and the energization mode switching operation of the energization control circuit 12 of the non-contact power feeding apparatus 1 of FIG. The positional deviation correction control of the movement control circuit 17 is executed independently in the x-axis direction and the y-axis direction, and FIG. 14A shows only the positional deviation correction control in the x-axis direction. The y-axis direction is the same as that in FIG.

  First, in step S10, the electromotive force detection circuit 13c determines whether or not the detection value V5 of the induced voltage of the detection coil 5 is greater than a predetermined threshold value Vth5. Here, the threshold value Vth5 is a threshold value for determining whether or not an induced voltage (induced current) is generated in the detection coil 5, and is set to a sufficiently small value. Actually, since various objects such as a casing are arranged around the power supply coil 3, even when the power reception coil 30 is not present in the vicinity of the power supply coil 3, Current) is not completely zero. The threshold value Vth5 is set in order to prevent erroneous determination due to the induced voltage (induced current) generated like noise. When V5 <Vth5, it is determined that the power receiving coil 30 does not exist in the vicinity of the power supply coil 3, and the power supply control circuit 12 sets the power supply mode to “power supply standby mode” (S11), and returns to step S10. On the other hand, if V5 ≧ Vth5, the process proceeds to the next step S12.

  Here, the energization modes of the energization control circuit 12 include a “power supply standby mode” and a “power supply mode”. The “power supply standby mode” is an energization mode in which the energization control circuit 12 intermittently energizes pulses at regular time intervals (for example, every 5 seconds). In this power supply standby mode, power is supplied only for the purpose of detecting the presence of the power receiving coil 30. On the other hand, the “power supply mode” is an energization mode in which the energization control circuit 12 continuously energizes.

  In step S12, the movement control circuit 17 determines whether or not the positional deviation amount Δx detected by the positional deviation detection circuit 16a is larger than a predetermined threshold value ε. If Δx ≦ ε, a power supply mode transition determination process (FIG. 14B) described later is performed (S13), and then the determination operation returns to step S10. If Δx> ε, the process proceeds to the next step S14.

  Next, in step S14, the movement control circuit 17 determines whether the phase difference Δφ43 detected by the phase difference detection circuit 18a is positive or negative. Here, when Δφ43 is positive, the movement control circuit 17 rotates the motor 7a by one step in the rotation direction in which the feeding coil assembly 6 moves to the right along the x axis (S15), and Δφ43 is negative. In this case, the movement control circuit 17 rotates the motor 7a by one step in the rotation direction in which the feeding coil assembly 6 moves to the left along the x axis (S16). And it returns to step S12 again.

  By this operation, the feed coil assembly 6 is controlled in position so that the feed coil 3 follows the position of the power receiving coil 30 in the x-axis direction and the feed coil 3 is positioned directly below the power receiving coil 30 in the x-axis direction. Also in the y-axis direction, position adjustment is performed in the same manner as in FIG.

  The power supply mode transition determination process in step S13 is executed according to the flow in FIG. First, the energization control circuit 12 determines whether the positional deviation amount Δx detected by the positional deviation detection circuit 16a and the positional deviation amount Δy detected by the positional deviation detection circuit 16b are both equal to or less than a predetermined threshold ε. In the case of (S21) and (Δx ≦ ε∧Δy ≦ ε), the energization control circuit 12 sets the energization mode to “power supply mode”. Otherwise, the “power supply standby mode” is maintained. As a result, power feeding is started when the power feeding coil 3 reaches a position immediately below the power receiving coil 30 in the x-axis direction and the y-axis direction.

  FIG. 15 is a block diagram illustrating a configuration of a non-contact power feeding system according to Embodiment 4 of the present invention. In the present embodiment, the misalignment detection mechanism and the position adjustment mechanism used in the non-contact power feeding apparatus of the second embodiment are applied to the non-contact power receiving apparatus 2 side. Therefore, the same components as those of the second embodiment (see FIG. 9) are denoted by the same reference numerals and description thereof is omitted. Further, the non-contact power feeding device 1 side is omitted because the internal configuration is the same as that of the third embodiment. Note that the non-contact power receiving apparatus 2 side does not transmit power, and therefore does not have the power supply circuit 10, the oscillation circuit 11, and the energization control circuit 12 in FIG. Thus, by applying the same to the non-contact power receiving device 2 side in the same manner, it is possible to detect misalignment and adjust the position on the non-contact power receiving device 2 side.

  In this embodiment, it is assumed that the non-contact power receiving device 2 is applied to an electric vehicle or an electric wheelchair, and a wheel for moving the entire non-contact power receiving device 2 and its driving mechanism (motor driving circuit 33). And a motor 34). The wheels are driven by a motor 34 to adjust the position of the non-contact power receiving device 2.

  Further, in this embodiment, an example in which the misalignment detection mechanism and the position adjustment mechanism used in the non-contact power feeding apparatus of Embodiment 2 are applied to the non-contact power receiving apparatus 2 side. The misalignment detection mechanism and the position adjustment mechanism used in the non-contact power feeding apparatus according to the third embodiment can be applied to the power receiving apparatus 2 side.

DESCRIPTION OF SYMBOLS 1 Non-contact electric power feeder 2 Non-contact electric power receiver 3 Feed coil 3a Coil core 3b Coil wire 4, 4a, 4b Detection coil 5 Detection coil 6 Feed coil assembly 7, 7a, 7b Motor 10 Power supply circuit 11 Oscillation circuit 12 Energization control circuit 13, 13a, 13b, 13c Electromotive force detection circuit 16, 16a, 16b Position shift detection circuit 17 Movement control circuit 18, 18a, 18b, 18c Phase difference detection circuit 19, 19a, 19b Position shift direction detection circuit 20 Resonance frequency control circuit 30 Coil 31 Rectifier circuit 32 Secondary battery

Claims (6)

A non-contact power supply device including a power supply coil to which AC power is supplied, and a non-contact power supply device that is detachably attached to the power supply coil and includes a power reception coil that resonates with the power supply coil and receives power supply from the power supply coil. A non-contact power feeding device used in a non-contact power feeding system including a power receiving device,
A first detection coil having a winding axis disposed in a direction perpendicular to the first central cross section in a plane of a first central cross section that is a plane including the central axis of the power supply coil; ,
The first detection coil is disposed so as to enclose the feeding coil in a coil ring of the first detection coil,
First electromotive force detection means for detecting the intensity of an electromotive voltage or an electromotive current generated in the first detection coil;
First phase difference detection means for detecting a phase difference between the phase of the voltage or current supplied to the power supply coil and the phase of the electromotive voltage or current generated in the first detection coil;
A first misalignment detecting means for determining the presence or absence of misalignment of the power receiving coil with respect to the power feeding coil by determining a threshold value of the intensity of the electromotive voltage or current detected by the first electromotive force detecting means;
First misalignment direction detecting means for detecting the misalignment direction of the first detection coil in the central axis direction (hereinafter referred to as “x-axis direction”) based on the phase difference detected by the first phase difference detecting means. And a non-contact power feeding device. The winding axis is in a direction perpendicular to the second central cross section in a plane of the second central cross section that includes the central axis of the feeding coil and is a plane perpendicular to the first central cross section. A second detection coil disposed;
The second detection coil is disposed so as to enclose the feeding coil in a coil ring of the second detection coil,
Second electromotive force detection means for detecting the intensity of an electromotive voltage or an electromotive current generated in the second detection coil;
Second phase difference detection means for detecting a phase difference between the phase of the voltage or current supplied to the power supply coil and the phase of the electromotive voltage or current generated in the second detection coil;
A second misalignment detecting means for determining whether or not the power receiving coil is misaligned with respect to the power feeding coil by determining a threshold value of the intensity of the electromotive voltage or electromotive current detected by the second electromotive force detecting means;
Second misalignment direction detecting means for detecting the misalignment direction of the second detection coil in the central axis direction (hereinafter referred to as “y-axis direction”) based on the phase difference detected by the second phase difference detecting means. And a non-contact power feeding device according to claim 1. A third detection coil is disposed on the side of the power supply coil in a direction perpendicular to the magnetic flux generated by the power supply coil when the winding axis is not close to the power supply coil. When,
Third phase difference detection means for detecting a phase difference between the phase of the voltage or current supplied to the feeding coil and the phase of the electromotive voltage or current generated in the third detection coil;
Resonance frequency control means for controlling the frequency of the voltage or current supplied to the power supply coil so that the phase difference detected by the third phase difference detection means becomes a predetermined value. The contactless power supply device according to claim 1 or 2. A third for detecting the intensity of the electromotive voltage or electromotive current generated in the third detection coil;
Electromotive force detection means,
Presence / absence detecting means for determining whether or not the power receiving coil is present in the vicinity of the power supply coil by determining a threshold value of the intensity of the electromotive voltage or electromotive current detected by the third electromotive force detecting means. The non-contact electric power feeder of Claim 3 characterized by the above-mentioned. A non-contact power supply device including a power supply coil to which AC power is supplied, and a non-contact power supply device that is detachably attached to the power supply coil and includes a power reception coil that resonates with the power supply coil and receives power supply from the power supply coil. A non-contact power receiving device used in a non-contact power feeding system including a power receiving device,
A first detection coil having a winding axis disposed in a direction perpendicular to the first central cross section in a plane of a first central cross section that is a plane including the central axis of the power receiving coil; ,
The first detection coil is disposed so as to enclose the power receiving coil in a coil ring of the first detection coil,
First electromotive force detection means for detecting the intensity of an electromotive voltage or an electromotive current generated in the first detection coil;
First phase difference detection for detecting a phase difference between a phase of voltage or current induced in the power receiving coil by an alternating magnetic field generated by the power feeding coil and a phase of electromotive voltage or current generated in the first detection coil Means,
A first misalignment detecting means for determining the presence or absence of misalignment of the power receiving coil with respect to the power feeding coil by determining a threshold value of the intensity of the electromotive voltage or current detected by the first electromotive force detecting means;
First misalignment direction detecting means for detecting the misalignment direction of the first detection coil in the central axis direction (hereinafter referred to as “x-axis direction”) based on the phase difference detected by the first phase difference detecting means. And a non-contact power receiving device. The winding axis is in a direction perpendicular to the second central cross section in a plane of the second central cross section that includes the central axis of the power receiving coil and is perpendicular to the first central cross section. A second detection coil disposed;
The second detection coil is disposed so as to enclose the power receiving coil in a coil ring of the second detection coil,
Second electromotive force detection means for detecting the intensity of an electromotive voltage or an electromotive current generated in the second detection coil;
Second phase difference detection for detecting a phase difference between the phase of the voltage or current induced in the power receiving coil by the alternating magnetic field generated by the power feeding coil and the phase of the electromotive voltage or current generated in the second detection coil. Means,
A second misalignment detecting means for determining whether or not the power receiving coil is misaligned with respect to the power feeding coil by determining a threshold value of the intensity of the electromotive voltage or electromotive current detected by the second electromotive force detecting means;
Second misalignment direction detecting means for detecting the misalignment direction of the second detection coil in the central axis direction (hereinafter referred to as “y-axis direction”) based on the phase difference detected by the second phase difference detecting means. And a non-contact power receiving device according to claim 5.

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