Contactless power supply device

Abstract

To provide a non-contact power-feeding device capable of effectively feeding power.SOLUTION: According to the embodiment, a non-contact power-feeding device comprises a primary side transformer, a phase capacitor, a secondary side transformer, a detection sensor, and a processor. The primary side transformer generates a magnetic flux. The phase capacitor changes a phase of AC current supplied to the primary side transformer. The secondary side transformer receives power supplied by the magnetic flux. The detection sensor detects leakage inductance of the magnetic flux. The processor acquires a detection value of the leakage inductance using the detection sensor, and identifies a displacement of the secondary side transformer based on the detection value to control the phase capacitor based on the displacement.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a contactless power supply device. [Background technology]

[0002] There is a device that uses a transformer to supply power contactlessly. When the device is configured as a slip ring that supplies power to a rotating body, the position or inclination of the rotating body may change due to the weight of an object placed on the rotating body.

[0003] When the position or inclination of the rotor changes, the distance and inclination between the primary transformer and the secondary transformer change, which causes the leakage inductance to change, increasing or decreasing the amount of change in the phase difference between the voltage and current flowing through the primary or secondary transformer. As a result, the efficiency of power supply by the contactless power supply device may decrease. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-174453 Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the above problems, a contactless power supply device capable of supplying power effectively is provided. [Means for solving the problem]

[0006] According to an embodiment, a contactless power supply device includes a primary transformer, a phase capacitor, a secondary transformer, a detection sensor, and a processor. The primary transformer generates a magnetic flux. The phase capacitor changes the phase of an AC current supplied to the primary transformer. The secondary transformer receives power from the magnetic flux. The detection sensor detects leakage inductance of the magnetic flux. The processor acquires a detected value of the leakage inductance using the detection sensor, identifies a displacement of the secondary transformer based on the detected value, and controls the phase capacitor based on the displacement. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view showing an example of the structure of a contactless power supply device according to the first embodiment. [Figure 2] FIG. 2 is a block diagram showing an example of the configuration of a control system of the contactless power supply device according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view showing an example in which the secondary transformer according to the first embodiment is displaced. [Figure 4] FIG. 4 is a cross-sectional view showing another example in which the secondary transformer according to the first embodiment is displaced. [Figure 5] FIG. 5 is a top view showing an example of the structure of a contactless power supply device according to the second embodiment. [Figure 6] FIG. 6 is a cross-sectional view taken along line F6-F6 in FIG. 5 according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments will be described with reference to the drawings. (First embodiment) First, the first embodiment will be described. The contactless power transfer device according to the first embodiment is a slip ring that supplies power to a rotating body. The contactless power transfer device contactlessly supplies power from a primary transformer to a secondary transformer included in the rotating body. With the above-described structure, the contactless power transfer device can supply power to the rotating body while rotating the rotating body. A load device that consumes power is installed on the rotating body. For example, a radar or the like is installed as a load device on the rotating body. Note that the load device installed on the rotating body of the contactless power transfer device is not limited to a specific configuration.

[0009] Fig. 1 is a cross-sectional view showing an example of the structure of a contactless power supply device 1 according to an embodiment. As shown in Fig. 1, the contactless power supply device 1 is configured with a contactless transformer that includes two disk-shaped transformers, also called doughnut-shaped transformers, a primary transformer 11 and a secondary transformer 12.

[0010] The primary transformer 11 generates a magnetic flux for supplying electric power. The primary transformer 11 has a ring-shaped case 11A with a U-shaped cross section and an opening at the top, and a flat cap 11B is disposed to cover the opening. Two concentric coils 11C are disposed near the secondary transformer 12 within the ring-shaped space enclosed by the case 11A and cap 11B. A ferrite core 11D is disposed within the space to fix the position of the coils 11C. In other words, the ferrite core 11D is disposed within the space formed by the case 11A and cap 11B, and the two coils 11C are disposed so as to fit into two concentric ring-shaped grooves formed on the top surface of the ferrite core 11D.

[0011] The secondary transformer 12 receives power from the magnetic flux generated by the primary transformer 11. The secondary transformer 12 is installed on top of and facing the primary transformer 11. The secondary transformer 12 includes a case 12A, a cap 12B, two coils 12C, and a ferrite core 12D, which are arranged symmetrically with the primary transformer 11 above and below.

[0012] Furthermore, leakage inductance occurs between the primary transformer 11 and the secondary transformer 12 .

[0013] A shaft 3 is formed at the center of the primary transformer 11 and the secondary transformer 12. The shaft 3 passes through a central hole of the primary transformer 11 and a central hole of the secondary transformer 12.

[0014] The primary transformer 11 is fixed to the shaft 3 . The secondary transformer 12 is rotatable around the shaft 3. The secondary transformer 12 is rotated around the shaft 3 by a drive mechanism (not shown) or the like.

[0015] A plurality of detection sensors 2 (detection sensors 2a to 2f) are formed near the outer periphery of the primary side transformer 11 and the secondary side transformer 12. Here, the detection sensors 2a to 2c form one set, and the detection sensors 2d to 2f form another set.

[0016] The detection sensors 2a to 2c are formed side by side in the height direction (Z-axis direction in FIG. 1). That is, one set is made up of a plurality of detection sensors 2 formed side by side in the Z-axis direction.

[0017] The detection sensor 2a is formed at a position closer to the secondary side transformer 12 (closer to the upper side). The detection sensor 2b is formed at the center of the primary transformer 11 and the secondary transformer 12.

[0018] The detection sensor 2c is formed at a position closer to (lower than) the primary side transformer 11. The detection sensor 2c is formed at a position facing the detection sensor 2a with the detection sensor 2b at the center.

[0019] The detection sensors 2d to 2f are formed at positions facing the detection sensors 2a to 2c, respectively, with the shaft 3 at the center.

[0020] The detection sensor 2 detects leakage inductance leaking from between the primary transformer 11 and the secondary transformer 12. For example, the detection sensor 2 is configured with a coil or the like that generates an electromotive force due to the leakage inductance.

[0021] In the state shown in FIG. 1, the detection sensors 2b and 2e are formed at the center of the primary transformer 11 and the secondary transformer 12, and therefore detect a stronger leakage inductance than the detection sensors 2a, 2c, 2d, and 2f.

[0022] Here, the detection sensor 2 and the secondary transformer 12 are assumed to be fixed. The primary transformer 11 is assumed to be displaced relative to the detection sensor 2 and the secondary transformer 12 due to the weight of the load device 19, etc. In other words, the primary transformer 11 moves or tilts relative to the detection sensor 2 and the secondary transformer 12.

[0023] Next, the control system of the contactless power supply device 1 will be described. Fig. 2 is a block diagram showing an example of the configuration of a control system of the contactless power supply device 1. As shown in Fig. 2, the contactless power supply device 1 includes a detection sensor 2, a primary-side transformer 11, a secondary-side transformer 12, a primary-side input power supply 15, a switching element 16, a phase capacitor 17, a smoothing circuit 18, a load device 19, and a switching control circuit 20.

[0024] A primary side input power supply 15 supplies a DC voltage of a predetermined voltage to a switching element 16 . The switching element 16 converts the DC voltage supplied from the primary side input power supply 15 into an AC voltage and supplies it to the phase capacitor 17 . The phase capacitor 17 changes the phase of the AC current under the control of the switching control circuit 20. That is, the phase capacitor 17 changes the phase of the AC current generated by the AC voltage from the switching element 16.

[0025] For example, the phase capacitor 17 is made up of a plurality of capacitors connected in parallel. The switching control circuit 20 controls the connection of each capacitor to be on or off, thereby changing the phase of the AC current.

[0026] The phase capacitor 17 changes the phase of the AC current and supplies the AC voltage and AC current to the coil 11C of the primary transformer 11.

[0027] Smoothing circuit 18 is connected to coil 12C of secondary transformer 12. Smoothing circuit 18 converts the electromotive force generated in coil 12C by the magnetic flux from primary transformer 11 into a DC voltage and smoothes it. Smoothing circuit 18 supplies the smoothed DC voltage to load device 19. For example, the smoothing circuit 18 is composed of a capacitor, a coil, a diode, and the like.

[0028] The load device 19 is a device that is installed on the case 12A of the secondary transformer 12. That is, the load device 19 rotates in accordance with the rotation of the secondary transformer 12. The load device 19 is driven by power from the smoothing circuit 18. For example, the load device 19 is a radar. The configuration of the load device 19 is not limited to a specific configuration.

[0029] The switching control circuit 20 is connected to the detection sensor 2. The switching control circuit 20 acquires the detection value of the leakage inductance detected by the detection sensor 2. The switching control circuit 20 controls the phase capacitor 17 in accordance with the acquired detection value. That is, the switching control circuit 20 changes the phase of the AC current supplied to the primary transformer 11 based on the leakage inductance. The operation of the switching control circuit 20 will be described in detail later.

[0030] The switching control circuit 20 includes a processor 21, a memory 22, and the like. The processor 21 and the memory 22 are connected to each other via an interface, a data bus, or the like.

[0031] The processor 21 controls the overall operation of the switching control circuit 20. For example, the processor 21 is configured with a CPU or the like. The processor 21 may also be configured with an ASIC (Application Specific Integrated Circuit) or the like. The processor 21 may also be configured with an FPGA (Field Programmable Gate Array) or the like.

[0032] The memory 22 stores various data. For example, the memory 22 functions as a ROM, a RAM, and an NVM. For example, the memory 22 stores a control program, control data, etc. The control program and control data are pre-installed according to the specifications of the switching control circuit 20. For example, the control program is a program that supports functions realized by the switching control circuit 20.

[0033] The memory 22 also temporarily stores data being processed by the processor 21. The memory 22 may also store data necessary for executing an application program, execution results of the application program, and the like.

[0034] Next, a description will be given of an example of the operation of the switching control circuit 20. The operation of the switching control circuit 20 is realized by the processor 21 executing a program stored in the internal memory, the memory 22, or the like.

[0035] First, the processor 21 detects leakage inductance leaking from the primary side transformer 11 and the secondary side transformer 12 using the detection sensor 2.

[0036] For example, the processor 21 measures the electromotive force generated in each detection sensor 2 through the detection sensor 2. When the electromotive force is measured, the processor 21 calculates the leakage inductance generated in each detection sensor 2 based on the electromotive force. Here, the processor 21 calculates detection values ​​(detection values ​​La to Lf) indicating the amount of leakage inductance based on the electromotive forces generated in the detection sensors 2a to 2f, respectively.

[0037] When the leakage inductance is detected, the processor 21 determines, based on the leakage inductance, the displacement of the secondary transformer 12. Here, the processor 21 determines, as the displacement, the tilt of the secondary transformer 12 and its position in the Z-axis direction.

[0038] For example, the processor 21 subtracts the detection value Lb of the central detection sensor 2b from the detection value La of the uppermost detection sensor 2a. That is, the processor 21 calculates the detection value La-detection value Lb.

[0039] Furthermore, the processor 21 subtracts the detection value Lb of the central detection sensor 2b from the detection value Lc of the lower-end detection sensor 2c. That is, the processor 21 calculates the detection value Lc-detection value Lb.

[0040] Similarly, the processor 21 calculates the detected value Le−the detected value Ld and the detected value Lf−the detected value Ld.

[0041] The processor 21 identifies the tilt and position of the secondary side transformer 12 based on the detected value La-detected value Lb, the detected value Lc-detected value Lb, the detected value Le-detected value Ld, and the detected value Lf-detected value Ld.

[0042] 1, the detected value Lb and the detected value Le are the largest, so the detected value La-detected value Lb, the detected value Lc-detected value Lb, the detected value Le-detected value Ld, and the detected value Lf-detected value Ld are all negative.

[0043] First, a case where the secondary transformer 12 is tilted will be described. 3 shows the secondary transformer 12 tilted to the left around the Y axis. As shown in FIG. 3, the distance between the primary transformer 11 and the secondary transformer 12 narrows at the left end. The distance between the primary transformer 11 and the secondary transformer 12 widens at the right end.

[0044] As the left end narrows, the detected value Lb decreases. Also, the detected value Lc increases. Therefore, the detected value Lc minus the detected value Lb increases. Also, the detected value La decreases further than the detected value Lb. Therefore, the detected value La minus the detected value Lb decreases.

[0045] Furthermore, as the right end widens, the detected value Ld increases. Also, the detected value Le decreases. Therefore, the detected value Ld minus the detected value Le increases. Also, the detected value Lf decreases further than the detected value Le. Therefore, the detected value Lf minus the detected value Le decreases.

[0046] The processor 21 uses the above characteristics to detect that the secondary transformer 12 has tilted to the left. For example, when the processor 21 detects an increase in the (detection value Lc - detection value Lb) and an increase in the (detection value Ld - detection value Le), the processor 21 detects that the secondary transformer 12 has tilted to the left. The processor 21 also calculates the angle of tilt of the secondary transformer 12 based on the increase in the (detection value Lc - detection value Lb) and the increase in the (detection value Ld - detection value Le), etc. Similarly, the processor 21 detects that the secondary transformer 12 has tilted to the right.

[0047] Next, a case where the secondary transformer 12 is displaced in the Z-axis direction will be described. Fig. 4 is a diagram showing the secondary transformer 12 displaced in the Z-axis direction. In the example shown in Fig. 4, the secondary transformer 12 displaces in a direction approaching the primary transformer 11. In other words, the distance between the primary transformer 11 and the secondary transformer 12 narrows at both ends.

[0048] As both ends narrow, the detected value Lb decreases. Also, the detected value Lc increases. Therefore, the detected value Lc minus the detected value Lb increases. Also, the detected value La decreases further than the detected value Lb. Therefore, the detected value La minus the detected value Lb decreases.

[0049] Similarly, the detected value Le decreases. Also, the detected value Lf increases. Therefore, the detected value Lf minus the detected value Le increases. Also, the detected value Ld decreases further than the detected value Le. Therefore, the detected value Ld minus the detected value Le decreases.

[0050] Using the above characteristics, the processor 21 detects that the secondary transformer 12 has been displaced in the Z-axis direction toward the primary transformer 11. For example, when the processor 21 detects an increase in the (detection value Lc - detection value Lb) and an increase in the (detection value Lf - detection value Le), the processor 21 detects that the secondary transformer 12 has been displaced in the Z-axis direction toward the primary transformer 11. The processor 21 also calculates the position to which the secondary transformer 12 has been displaced based on the increase in the (detection value Lc - detection value Lb) and the increase in the (detection value Lf - detection value Le), etc. Similarly, the processor 21 detects that the secondary transformer 12 has been displaced in a direction away from the primary transformer 11 .

[0051] Once the displacement of the secondary transformer 12 is identified, the processor 21 calculates the coupling coefficient (or mutual inductance) between the primary transformer 11 and the secondary transformer 12 based on the displacement of the secondary transformer 12. For example, the processor 21 calculates the coupling coefficient by substituting parameters related to the displacement, such as the tilt or position of the secondary transformer 12, into a predetermined formula. The method by which the processor 21 calculates the coupling coefficient is not limited to a specific method.

[0052] After calculating the coupling coefficient, the processor 21 adjusts, based on the coupling coefficient, the phase of the AC current flowing through the primary transformer 11. That is, the processor 21 adjusts, based on the coupling coefficient, the phase of the AC current so as to reduce the phase difference between the AC voltage and the AC current in the primary transformer 11.

[0053] For example, the memory 22 stores in advance a table in which the coupling coefficients are associated with switching information indicating the connection relationship of each capacitor in the phase capacitor 17.

[0054] The processor 21 refers to the table and acquires switching information corresponding to the calculated coupling coefficient. After acquiring the switching information, the processor 21 controls the phase capacitor 17 based on the switching information. That is, the processor 21 controls the on / off of the connection of each capacitor constituting the phase capacitor 17 based on the switching information.

[0055] For example, the processor 21 controls the phase capacitor 17 by PWM (Pulse Width Modulation).

[0056] The processor 21 repeats the above operation to compensate for the fluctuation in the coupling coefficient between the primary side transformer 11 and the secondary side transformer 12.

[0057] The processor 21 may generate the switching information from the coupling coefficients in accordance with a predetermined algorithm. Furthermore, the secondary transformer 12 does not have to be a rotating one.

[0058] The contactless power supply device configured as described above identifies the displacement of the secondary transformer based on the leakage inductance and calculates a coupling coefficient based on the identified displacement. The contactless power supply device controls the phase of the AC current supplied to the primary transformer based on the calculated coupling coefficient. As a result, the contactless power supply device can effectively supply power to the secondary transformer even when the secondary transformer is displaced.

[0059] Furthermore, the contactless power supply device identifies the displacement of the secondary transformer based on the difference between the detection values ​​of the multiple detection sensors. As a result, the contactless power supply device can effectively identify the displacement of the secondary transformer even when the detection value increases or decreases due to an increase or decrease in the power supplied from the primary transformer. (Second embodiment) Next, a second embodiment will be described. The contactless power supply device according to the second embodiment differs from the contactless power supply device 1 according to the first embodiment in that it includes six sets of detection sensors. Therefore, the other features are denoted by the same reference numerals and detailed description thereof will be omitted.

[0060] Fig. 5 is a top view of a contactless power supply device 1' according to the second embodiment. Fig. 6 is a cross-sectional view taken along line F6-F6.

[0061] As shown in FIGS. 5 and 6, the contactless power supply device 1′ includes a detection sensor 2, a shaft 3, a primary side transformer 11, a secondary side transformer 12, and the like.

[0062] Here, the contactless power supply device 1' includes detection sensors 2a to 2l. The detection sensors 2a to 2l are formed near the outer peripheries of the primary side transformer 11 and the secondary side transformer 12. The detection sensors 2a and 2b form one set. The detection sensors 2c and 2d form one set. The detection sensors 2e and 2f form one set. The detection sensors 2g and 2h form one set. The detection sensors 2i and 2j form one set. The detection sensors 2k and 2l form one set.

[0063] The detection sensors 2g and 2h are formed at positions shifted 60 degrees from the detection sensors 2a and 2b around the shaft 3. The detection sensors 2i and 2j are formed at positions shifted 60 degrees from the detection sensors 2g and 2h around the shaft 3.

[0064] Detection sensors 2c and 2d are formed at positions facing detection sensors 2a and 2b, respectively, around shaft 3. Detection sensors 2e and 2f are formed at positions facing detection sensors 2g and 2h, respectively, around shaft 3. Detection sensors 2k and 2l are formed at positions facing detection sensors 2i and 2j, respectively, around shaft 3.

[0065] 6, the detection sensors 2a and 2b are formed side by side in the height direction (the Z-axis direction in FIG. 1). That is, one set is made up of a plurality of detection sensors 2 formed side by side in the Z-axis direction.

[0066] The detection sensor 2a is formed at a position closer to the secondary side transformer 12 (closer to the upper side). The detection sensor 2b is formed at a position closer to (lower than) the primary transformer 11. The detection sensor 2b is formed at a position facing the detection sensor 2a, with the XY plane at the center, midway between the primary transformer 11 and the secondary transformer 12.

[0067] The detection sensors 2c to 2d are formed at positions facing the detection sensors 2a and 2b, respectively, with the shaft 3 at the center. The detection sensors 2e to 2l are formed in the same manner as the detection sensors 2a to 2d, respectively.

[0068] The control system of the contactless power supply device 1' is the same as that of the contactless power supply device 1 according to the first embodiment, and therefore a description thereof will be omitted.

[0069] Next, a description will be given of an example of the operation of the switching control circuit 20. The operation of the switching control circuit 20 is realized by the processor 21 executing a program stored in the internal memory, the memory 22, or the like.

[0070] First, the processor 21 detects leakage inductance leaking from the primary side transformer 11 and the secondary side transformer 12 using the detection sensor 2.

[0071] For example, the processor 21 measures the electromotive force generated in each detection sensor 2 through the detection sensor 2. When the electromotive force is measured, the processor 21 calculates the leakage inductance generated in each detection sensor 2 based on the electromotive force. Here, the processor 21 calculates detection values ​​(detection values ​​La to Lf) indicating the amount of leakage inductance based on the electromotive forces generated in the detection sensors 2a to 2l, respectively.

[0072] When detecting leakage inductance, the processor 21 subtracts the detection value L of the lower-end detection sensor 2 in one set from the detection value of the upper-end detection sensor 2. That is, the processor 21 calculates the detection value La-detection value Lb, the detection value Lc-detection value Ld, the detection value Le-detection value Lf, the detection value Lg-detection value Lh, the detection value Li-detection value Lj, ​​and the detection value Lk-detection value Ll.

[0073] The processor 21 determines the displacement of the primary side transformer 11 and the displacement of the secondary side transformer 12 based on the detection value La-detection value Lb, the detection value Lc-detection value Ld, the detection value Le-detection value Lf, the detection value Lg-detection value Lh, the detection value Li-detection value Lj, ​​and the detection value Lk-detection value Ll.

[0074] For example, the processor 21 identifies the X-axis, Y-axis, and Z-axis positions of the primary transformer 11 and the X-axis, Y-axis, and Z-axis positions of the secondary transformer 12.

[0075] After identifying the displacement of the primary transformer 11 and the displacement of the secondary transformer 12, the processor 21 calculates a coupling coefficient (or mutual inductance) between the primary transformer 11 and the secondary transformer 12 based on the displacement of the primary transformer 11 and the displacement of the secondary transformer 12. For example, the processor 21 calculates the coupling coefficient by substituting a parameter indicating the displacement of the primary transformer 11 and a parameter indicating the displacement of the secondary transformer 12 into a predetermined formula. The method by which the processor 21 calculates the coupling coefficient is not limited to a specific method.

[0076] After calculating the coupling coefficient, the processor 21 adjusts, based on the coupling coefficient, the phase of the AC current flowing through the primary transformer 11. That is, the processor 21 adjusts, based on the coupling coefficient, the phase of the AC current so as to reduce the phase difference between the AC voltage and the AC current in the primary transformer 11.

[0077] For example, the memory 22 stores in advance a table in which the coupling coefficients are associated with switching information indicating the connection relationship of each capacitor in the phase capacitor 17.

[0078] The processor 21 refers to the table and acquires switching information corresponding to the calculated coupling coefficient. After acquiring the switching information, the processor 21 controls the phase capacitor 17 based on the switching information. That is, the processor 21 controls the on / off of the connection of each capacitor constituting the phase capacitor 17 based on the switching information.

[0079] For example, the processor 21 controls the phase capacitor 17 by PWM.

[0080] The processor 21 repeats the above operation to compensate for the fluctuation in the coupling coefficient between the primary side transformer 11 and the secondary side transformer 12.

[0081] The processor 21 may also identify the position in the X-axis direction, the position in the Y-axis direction, the position in the Z-axis direction, the tilt around the X-axis, and the tilt around the Y-axis of the secondary transformer 12. In this case, the processor 21 calculates the coupling coefficient based on the position in the X-axis direction, the position in the Y-axis direction, the position in the Z-axis direction, the tilt around the X-axis, and the tilt around the Y-axis of the secondary transformer 12.

[0082] Furthermore, the processor 21 may subtract the detection value L of the detection sensor 2 at the upper end from the detection value of the detection sensor 2 at the lower end in one set.

[0083] Furthermore, the contactless power supply device 1' may include seven or more sets of detection sensors. The number of sets included in the contactless power supply device 1' is not limited to a specific number. Furthermore, one set of detection sensors 2 may be made up of three or more detection sensors 2.

[0084] The contactless power transfer device configured as described above calculates one difference between the detected values ​​from the six sets. Therefore, the contactless power transfer device can acquire six variables. Therefore, the contactless power transfer device can identify the displacement of the primary side transformer or the secondary side transformer in more detail.

[0085] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0086] 1...contactless power supply device, 1'...contactless power supply device, 2...detection sensor, 2a...detection sensor, 2b...detection sensor, 2c...detection sensor, 2d...detection sensor, 2e...detection sensor, 2f...detection sensor, 2g...detection sensor, 2h...detection sensor, 2i...detection sensor, 2j...detection sensor, 2k...detection sensor, 2l...detection sensor, 3...shaft, 11...primary side transformer, 11A...case, 11B...cap, 11C...coil, 11D...ferrite core, 12...secondary side transformer, 12A...case, 12B...cap, 12C...coil, 12D...ferrite core, 15...primary side input power supply, 16...switching element, 17...phase capacitor, 18...smoothing circuit, 19...load device, 20...switching control circuit, 21...processor, 22...memory

Claims

1. a primary transformer that generates magnetic flux; a phase capacitor that changes the phase of the AC current supplied to the primary side transformer; a secondary transformer that receives power from the magnetic flux; a detection sensor for detecting leakage inductance of the magnetic flux; Using the detection sensor, a detection value of the leakage inductance is obtained; Identifying the position and inclination of the secondary transformer based on the detected value; controlling the phase capacitor based on the position and tilt; a processor; A contactless power supply device comprising:

2. a primary transformer that generates magnetic flux; a phase capacitor that changes the phase of the AC current supplied to the primary side transformer; a secondary transformer that receives power from the magnetic flux; a detection sensor for detecting leakage inductance of the magnetic flux; a set of a plurality of the detection sensors arranged in a direction from the primary transformer toward the secondary transformer; Using the detection sensor, a detection value of the leakage inductance is obtained; determining a displacement of the secondary transformer based on a difference between a detection value of one of the detection sensors and a detection value of another of the detection sensors in the set; controlling the phase capacitor based on the displacement; a processor; A contactless power supply device comprising:

3. the processor identifies the displacement based on a difference between a detection value of the detection sensor at an upper end and a detection value of the detection sensor at a center in the set, and a difference between a detection value of the detection sensor at a lower end and a detection value of the detection sensor at a center in the set. The contactless power supply device according to claim 2 .

4. the processor identifies the displacement based on a difference between a detection value of the detection sensor at an upper end and a detection value of the detection sensor at a lower end in the set. The contactless power supply device according to claim 2 .

5. The secondary side transformer is a rotating body. The contactless power supply device according to any one of claims 1 to 4.

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