HK1206481B - Contactless electrical-power-supplying transformer for moving body - Google Patents

Description

Non-contact power supply transformer for mobile body

Technical Field

The present invention relates to a contactless power supply transformer for a mobile body that supplies power to a mobile body such as an electric vehicle in a contactless manner, and more particularly, to a transformer that can avoid the influence on health and the like due to exposure to a magnetic field, can easily achieve a large capacity, and has compatibility with different types of contactless power supply transformers.

Background

As a system for charging a battery of an electric vehicle or a plug-in hybrid vehicle, a system has been developed in which a secondary side coil (power receiving coil) 20 of a non-contact power feeding transformer is mounted on a floor surface of a vehicle, and power is fed in a non-contact manner from a primary side coil (power transmission coil) 10 provided on the upper side of the ground by electromagnetic induction, as shown in fig. 18.

Patent document 1 listed below discloses a coil in which a wire is spirally and flatly wound around one surface of a flat ferrite core 21, 31 as shown in fig. 19A and 19B, as a power transmission coil and a power reception coil of a non-contact power transmission transformer used in the system. Since the windings 22 and 32 are wound around only one side of the ferrite cores 21 and 31, the coil of this type is referred to as a "one-side wound coil". Fig. 19A is a cross-sectional view of the power transmission coil and the power reception coil, and fig. 19B is a plan view of the power transmission coil or the power reception coil.

In the case of a non-contact power transmission transformer using a one-side wound coil, power transmission efficiency is significantly reduced when the parking position of the vehicle is shifted and the power transmission coil and the power receiving coil are not aligned with each other or the gap between the power transmission coil and the power receiving coil is varied. If the allowable amount for such a positional deviation or gap variation is increased, the sizes of the power transmission coil and the power reception coil need to be increased.

Patent document 2 discloses a contactless power supply transformer that has a large allowable amount of displacement and gap variation and can be configured to be small. As shown in fig. 20A and 20B, in the contactless power transformer, a power transmission coil and a power reception coil are formed by winding windings 62 and 64 around ferrite cores 61 and 63. This coil is referred to as a "double-side-winding coil". Here, as shown in fig. 20B, "square cores" are used as the ferrite cores 61, 63. Fig. 20A is a cross-sectional view of the power transmission coil and the power reception coil, and fig. 20B is a plan view of the power transmission coil or the power reception coil.

In the contactless power supply transformer, a main magnetic flux 67 that travels through the magnetic pole portions of the ferrite cores 61 and 63 is generated. At the same time, leakage magnetic fluxes 68 and 69 detouring on the non-opposing surfaces of the power transmission coil and the power reception coil are generated. When the leakage magnetic fluxes 68 and 69 enter an iron plate or the like on the floor of the vehicle body, an induced current flows to heat the iron plate, thereby reducing the power supply efficiency. In order to avoid this, in the non-contact power feeding transformer using the both-side wound coils, it is necessary to arrange good non-magnetic conductors 65 and 66 such as aluminum plates on the back surfaces of the power transmission coil and the power reception coil to magnetically shield leakage fluxes 68 and 69.

Patent document 3 discloses a power transmission coil and a power reception coil in which a ferrite core 40 is formed in an H-shape, parallel portions 41 and 42 on both sides of the H-shape are magnetic pole portions, and a winding 50 is wound around a portion 43 corresponding to a horizontal bar of the H-shape (a portion connecting between the magnetic pole portions, also referred to as a wound portion) in order to achieve further reduction in size and weight of a double-sided wound coil, as shown in fig. 21A to 21F. Fig. 21A shows a state in which the winding 50 is wound around the ferrite core 40, and fig. 21D shows a state in which the winding 50 is not wound around the ferrite core 40. Fig. 21B is a sectional view taken along line a-a of fig. 21A, and fig. 21C is a sectional view taken along line B-B of fig. 21A. Similarly, FIG. 21E is a sectional view taken along the line A-A of FIG. 21D, and FIG. 21F is a sectional view taken along the line B-B of FIG. 21D.

When power transmission coils and power reception coils, each including a pair of side-wound coils using the H-shaped core, were opposed to each other at an interval of a standard gap length of 70mm and power was supplied at 3kW, power supply characteristics were obtained in which the transformer efficiency was 95%, the allowable amount of positional deviation in the left-right direction (y direction in fig. 21A) was ± 150mm, the allowable amount of positional deviation in the front-rear direction (x direction in fig. 21A) was ± 60mm, and the efficiency when the standard gap length was increased to 100mm was 92%.

Patent document 1, Japanese patent laid-open No. 2008-87733

Patent document 2 Japanese laid-open patent publication No. 2010-172084

Patent document 3, Japanese patent application laid-open No. 2011-

In contactless power feeding of a moving body, rapid charging that can feed power in a short time, power feeding for a large-sized electric vehicle, and the like are desired. Therefore, the capacity of the contactless power supply transformer needs to be increased, but when the capacity is increased, the influence of the leakage magnetic field on the human body and the like need to be considered.

In the case of a non-contact power feeding transformer using coils wound on both sides, when the allowable amount for the positional deviation or the gap variation between the power transmission coil and the power reception coil is large, the magnetic field (leakage field) that diverges to the surroundings is larger than that of a coil wound on one side when viewed from a different angle.

Therefore, in the non-contact power supply transformer using the both-side wound coil, it is particularly necessary to consider the leakage magnetic field.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a contactless power supply transformer for a moving body, which can suppress a leakage magnetic field and can increase a capacity.

The present invention is a contactless power feeding transformer for a mobile body, which is configured by a power transmission coil and a power receiving coil, the power receiving coil being provided at an installation position on a bottom lower surface of the mobile body (for example, as shown in fig. 18), and the mobile body being moved to a power feeding position where the power receiving coil faces the power transmission coil to perform contactless power feeding, wherein at least one of the power transmission coil and the power receiving coil is configured by a combined double-sided winding coil in which a plurality of single double-sided winding coils each having a winding wound around a wound portion between magnetic pole portions of a core are combined, and the combined double-sided winding coils are combined as follows: the method includes the steps of linearly arranging wound sections of a plurality of single double-side wound coils, connecting magnetic pole sections of adjacent single double-side wound coils to each other, and setting the number of single double-side wound coils combined into a combined double-side wound coil so that the product of the power supply capacity and the number of the selected single double-side wound coils satisfies the power supply capacity of the non-contact power supply transformer, wherein the directions of magnetic fluxes in the vertical direction from the connected magnetic pole sections toward the target coil are the same, and the leakage magnetic fluxes around the moving body when the combined double-side wound coil including 2 single double-side wound coils is provided at the installation position of the moving body do not exceed a predetermined value.

In the case of a combined double-sided winding coil composed of 2 single double-sided winding coils, the leakage magnetic fields generated from the single double-sided winding coils constituting the combined double-sided winding coil cancel each other at positions sufficiently separated from each other, and therefore the magnitude of the leakage magnetic field is greatly reduced. This is considered to be the same principle as that in the case of the one-side wound coil of fig. 19, the attenuation characteristic of the leakage magnetic field is good. Therefore, when a single both-side winding coil constituting the combined both-side winding coil is selected, the combined both-side winding coil constituted by 2 single both-side winding coils is placed at the set position, and the single both-side winding coil satisfying the condition of the leakage magnetic field is selected. In order to reduce the leakage magnetic flux, it is preferable that the number of single both-side-winding coils used for the combined both-side-winding coils is even, but in the case where the leakage magnetic field does not cause a problem, the combined both-side-winding coils may be configured by odd numbers of single both-side-winding coils.

In the contactless power feeding transformer for a moving body according to the present invention, the power receiving coil formed of the coupled both-side winding coils may be provided at an installation position on the lower surface of the moving body so that the arrangement direction of a single one of the coupled both-side winding coils coincides with the front-rear direction of the moving body.

In the both-side-winding coil, the allowance of the positional deviation in the direction orthogonal to the pair of magnetic pole portions (i.e., the arrangement direction of the single both-side-winding coil) is smaller than the direction parallel to the pair of magnetic pole portions, and therefore, the front-rear direction of the moving body in which the prevention measure of the positional deviation (such as the stoppage of the tire) is easy to take may be made to correspond to the direction in which the allowance of the positional deviation is smaller.

In the contactless power feeding transformer for a moving body according to the present invention, the single bilateral wound coil may have an H-shaped core in which a wound portion is disposed in an intermediate portion between a pair of magnetic pole portions arranged in parallel.

By using the H-shaped core, the amount of ferrite used can be reduced, and weight reduction, size reduction, and cost reduction can be achieved. Further, the allowable amount of displacement and gap variation can be increased by increasing only the length of the magnetic pole portion (the length in the vertical direction of the H-shape).

In the contactless power transformer for a moving body according to the present invention, when the total width of the connected magnetic pole portions of the coupled double-side wound coils (the width in the arrangement direction of the single double-side wound coil) is D1 and the width of the magnetic pole portion located at the end of the coupled double-side wound coil is D2, D1 < 2 × D2 may be used to shorten the length in the arrangement direction of the coupled double-side wound coils.

In the adjacent position of the single two-side winding coil, the magnetic pole parts of the two single two-side winding coils are connected to have 2 times of width, so that the width of one magnetic pole part can be narrowed.

In the contactless power feeding transformer for a mobile object of the present invention, each of the power transmission coil and the power reception coil may be constituted by a combined double-sided winding coil in which 2 single double-sided winding coils are combined, and in the combined double-sided winding coil of one of the power transmission coil and the power reception coil, the windings of the 2 single double-sided winding coils are electrically connected in series, and in the combined double-sided winding coil of the other of the power transmission coil and the power reception coil, the windings of the 2 single double-sided winding coils are electrically connected in parallel.

When the windings of the plurality of single double-side winding coils constituting the power transmission coil and the power reception coil are connected only in series, the currents flowing through the windings connected in series are the same, and therefore, even if a positional deviation occurs between the power transmission coil and the power reception coil, it is difficult to generate an imbalance in the power supply of each single double-side winding coil, but the voltage becomes high and it is difficult to cope with this. On the other hand, when the windings of the plurality of single double-side-winding coils are connected only in parallel, the voltage is low, but when a positional deviation occurs, imbalance in the power supply to each single double-side-winding coil is likely to occur. By combining the series connection and the parallel connection, a rise in voltage can be suppressed, and balance of current can be obtained.

In the contactless power supply transformer for a mobile unit according to the present invention, each of the power transmission coil and the power reception coil may be constituted by a combined double-sided winding coil in which m groups (m is a natural number) of 2 single double-sided winding coils are combined, and in the combined double-sided winding coil of one of the power transmission coil and the power reception coil, the windings of the 2 single double-sided winding coils in each group are electrically connected in series, and the windings of the m groups of single double-sided winding coils are electrically connected in parallel, and in the combined double-sided winding coil of the other of the power transmission coil and the power reception coil, the windings of the 2 single double-sided winding coils in each group are electrically connected in parallel, and the windings of the m groups of single double-sided winding coils are electrically connected in parallel.

A series connection can be embedded among the parallel connections to obtain current balance.

In the contactless power feeding transformer for a mobile object according to the present invention, the power transmission coil and the power reception coil may be each configured by a combined double-side winding coil in which m sets (m is a natural number) of 2 single double-side winding coils are combined, and the power transmission coil and the power reception coil may be each configured by: the windings of the 2 single two-side-wound coils within each group are respectively electrically connected in series, and the windings of the m groups of single two-side-wound coils are electrically connected in parallel.

A series connection can be embedded among the parallel connections to obtain current balance.

In the contactless power feeding transformer for a moving object according to the present invention, one of the power transmission coil and the power reception coil may be a combined double-side winding coil in which 2 single double-side winding coils are combined, and the other of the power transmission coil and the power reception coil may be a single-side winding coil in which an electric wire is wound flatly on one surface of a flat ferrite core.

As described above, the combined both-side winding coil in which 2 single both-side winding coils are combined can supply power not only to the combined both-side winding coil of the same type but also to the one-side winding coil.

The present invention provides a mobile body non-contact power supply transformer capable of suppressing a leakage magnetic field and easily realizing a large capacity. Further, power can be supplied not only to both side-winding coils of the same type but also to one side-winding coils of different types, and compatibility with the one side-winding coil can be provided.

Drawings

Fig. 1A is a diagram showing a state in which single bilateral wound coils having opposite winding directions are connected in series in a contactless power supply transformer according to an embodiment.

Fig. 1B is a diagram showing a state in which single bilateral wound coils having the same winding direction are connected in series in the contactless power supply transformer according to the embodiment.

Fig. 2 is a diagram showing main magnetic fluxes of the non-contact power supply transformer according to the embodiment.

Fig. 3A is a diagram showing a state in which single bilateral winding coils having opposite winding directions are connected in parallel in the contactless power supply transformer according to the embodiment.

Fig. 3B is a diagram showing a state in which single bilateral winding coils having the same winding direction are connected in parallel in the contactless power supply transformer according to the embodiment.

Fig. 4 is a view showing a mounting direction of the power receiving coil according to the embodiment to the vehicle.

Fig. 5 is a diagram showing the distribution of magnetic lines of force in conjunction with the both-side-winding coils in the non-contact power supply transformer according to the embodiment.

Fig. 6 is a diagram showing the distribution of magnetic lines of force of a single double-side-wound coil unit.

Fig. 7A is a plan view showing a structure of a single both-side-wound coil.

Fig. 7B is a side view in the case where a single double-side wound coil is disposed to face each other.

Fig. 7C is a diagram illustrating a case where a single double-sided winding coil is arranged to face each other, and is a diagram illustrating only the single double-sided winding coil arranged to face each other in a cross-sectional view.

Fig. 8 is a diagram illustrating a state in which the supply power is not increased even if a single both-side-winding coil is connected.

Fig. 9A is a diagram showing a configuration of a combined both-side wound coil in the non-contact power feeding transformer according to the embodiment for measuring the leakage magnetic flux density.

Fig. 9B is a graph showing the measurement result of the leakage magnetic flux density of the combined both-side-winding coil of fig. 9A.

Fig. 10A is a diagram showing a structure of a single double-side-wound coil unit for measuring the leakage magnetic flux density.

Fig. 10B is a graph showing the measurement result of the leakage magnetic flux density in the single double-side-wound coil unit of fig. 10A.

Fig. 11 is a graph comparing the measurement results of fig. 9B and 10B.

Fig. 12 is a diagram showing a formula representing an approximate curve of a change in magnetic flux density of fig. 11.

Fig. 13A is a diagram showing characteristic changes associated with positional shifts in the x direction in the contactless power supply transformer according to the embodiment.

Fig. 13B is a diagram showing characteristic changes associated with a positional shift in the y direction in the contactless power supply transformer according to the embodiment.

Fig. 13C is a diagram showing characteristic changes accompanying the variation in gap length in the contactless power supply transformer according to the embodiment.

Fig. 14A is a diagram showing an electrical connection method of a combined double-side wound coil configured by "2 × 2 sets" of single double-side wound coils.

Fig. 14B is a diagram showing another example of an electrical connection method of a combined double-wound coil configured by "2 × 2 sets" of single double-wound coils.

Fig. 15A is a diagram showing another electrical connection method of a combined double-wound coil configured by "2 × 2 sets" of single double-wound coils.

Fig. 15B is a diagram showing another electrical connection method of a combined double-wound coil configured by "2 × 2 sets" of single double-wound coils.

Fig. 16 is a diagram showing a modification example in which the width of the magnetic pole portion connected to the both-side wound coil is narrowed.

Fig. 17A is a sectional view showing a contactless power supply transformer in which both side-winding coils and one side-winding coil are opposed to each other.

Fig. 17B is a top view of fig. 17A.

Fig. 18 is a diagram showing a contactless power supply system to a vehicle.

Fig. 19A is a cross-sectional view showing a conventional one-side-wound coil.

Fig. 19B is a top view of fig. 19A.

Fig. 20A is a cross-sectional view showing a conventional double-side-wound coil using a square core.

Fig. 20B is a top view of fig. 20A.

Fig. 21A is a diagram illustrating a conventional double-side-wound coil using an H-shaped core, and shows a state in which a winding is wound.

Fig. 21B is a sectional view taken along line a-a of fig. 21A.

Fig. 21C is a sectional view taken along line B-B of fig. 21A.

Fig. 21D is a diagram illustrating a conventional double-side-wound coil using an H-shaped core, and shows a state in which no winding is wound.

Fig. 21E is a cross-sectional view taken along line a-a of fig. 21D.

Fig. 21F is a cross-sectional view taken along line B-B of fig. 21D.

Detailed Description

Fig. 1A and 1B schematically show a power transmission coil of a mobile body non-contact power feeding transformer according to an embodiment of the present invention. The power receiving coil has the same structure.

The power transmission coil is formed of a combined both-side-wound coil in which 2 single both-side-wound coils 100 and 200 are combined.

The single double-sided wound coils 100 and 200 are formed by winding litz wire around the wound portion of an H-shaped core, and specifically, as shown in fig. 7A and 7B, the H-shaped core is formed of a pair of parallel magnetic pole cores 80 and a winding core 81 perpendicular to the magnetic pole cores 80. The magnetic pole core 80 and the winding core 81 are ferrite cores.

The winding core 81 has a winding portion 50 around which an electric wire is wound at the center thereof, and ferrite plates protruding from both sides of the winding portion 50 have both ends connected to the pole core 80 via lower ferrite plates 82.

As shown in fig. 7C, a lower ferrite plate 82 is laminated on the side facing the target coil so as to raise the height of the uppermost magnetic pole core 80 to be equal to the height of the winding portion 50 or higher than the height of the winding portion 50, and the magnetic pole core 80 is disposed on the lower ferrite plate 82.

By providing the magnetic pole core 80 of the magnetic pole portion with the "legs" formed by the lower ferrite plate 82 in this manner, the magnetic gap length G2 can be made equal to the gap length G1 of the winding portion 50 or can be made shorter than the gap length G1 of the winding portion 50. As described above, when the magnetic gap length is shortened, the coupling coefficient between the coils increases, and the power feeding efficiency and the maximum power feeding power increase.

As shown in fig. 1A and 1B, 2 single both-side-winding coils 100 and 200 are combined: magnetic pole core 180 of single double-wound coil 100 is connected to magnetic pole core 280 of adjacent single double-wound coil 200, and winding core 181 of single double-wound coil 100 and winding core 281 of adjacent single double-wound coil 200 are linearly arranged.

Fig. 2 shows a main magnetic flux between a power transmission coil 10 and a power reception coil 20, each of which is formed of a combined double-side winding coil in which 2 single double-side winding coils are combined. In each of the power transmission coil 10 and the power reception coil 20, in the 2 windings 150 and 250 each having a single double-side wound coil, a current is passed so that the direction of the main flux passing through the winding core 181 is opposite to the direction of the main flux passing through the winding core 281, and the direction of the main flux perpendicularly directed from each of the magnetic pole cores 180 and 280 disposed in connection to the opposing coil is the same.

In this way, by aligning the vertical directions of the main magnetic fluxes heading toward the target coil from the magnetic pole cores 180 and 280 disposed in series, the magnetic field acting between the power transmission coil 10 and the power reception coil 20 is increased, and the power supply power is increased. The power supply power of the combined both-side winding coil combining a plurality of single both-side winding coils increases in proportion to the number of single both-side winding coils.

On the other hand, in the combined double-sided winding coil in which 2 single double-sided winding coils are combined, the leakage magnetic fields independently generated from the single double-sided winding coils cancel each other at positions sufficiently separated, so that the magnitude of the leakage magnetic field is greatly reduced.

However, as shown in fig. 8, if the vertical direction of the main flux from the magnetic pole core 180 toward the target coil is opposite to the vertical direction of the main flux from the magnetic pole core 280 toward the target coil, the main flux in the vertical direction is cancelled, and therefore, even if a plurality of single both-side winding coils are combined, the power supply cannot be increased.

Fig. 1A shows a case where 2 single both-side-winding coils 100 and 200 are connected in series with the winding directions of the coils reversed, and the power supply of the combined both-side-winding coil is increased to 2 times the power supply of the single both-side-winding coil. Fig. 1B shows a case where 2 single double-side-winding coils are wound in the same direction, and the windings are connected in series so that the power supply of the combined double-side-winding coil is increased to 2 times the power supply of the single double-side-winding coil.

Fig. 3A shows a case where 2 single bilateral winding coils 100 and 200 are connected in parallel with the winding directions of the coils reversed, and the power supply of the combined bilateral winding coils is increased to 2 times the power supply of the single bilateral winding coil. Fig. 3B shows a case where 2 single both-side-winding coils 100 and 200 are connected in parallel with the same winding direction, and the power supply of the combined both-side-winding coil is increased to 2 times the power supply of the single both-side-winding coil.

As shown in fig. 4, the power receiving coil formed by coupling the both-side wound coils is disposed at the installation position on the lower surface of the floor of the vehicle such that the arrangement direction of the single both-side wound coil coincides with the front-rear direction of the vehicle.

Fig. 5 shows the magnetic field line distribution of a combined two-side-wound coil combining 2 single two-side-wound coils, which was investigated using magnetic field resolution software (JMAG-Designer ver.11.0). Here, a magnetic flux distribution of a combined both-side-wound coil in which 2 single both-side-wound coils having a power supply capacity of 12.5kW are combined to perform power supply of 25kW is shown. For comparison, fig. 6 shows the flux distribution of a single double side wound coil unit powered at 12.5 kW. 65. 66 is an aluminum plate for magnetic shielding.

In the combined both-side winding coil in which 2 single both-side winding coils are combined, leakage magnetic fields of the same degree as the single both-side winding coil are generated from the magnetic pole cores at both ends. However, the leakage magnetic field from the positions of the connected pole cores is small because the leakage magnetic fields independently generated from the single both-side wound coil cancel each other at the positions sufficiently separated.

Therefore, the combined two-side winding coil combined with 2 single two-side winding coils has a power supply capacity 2 times that of the single two-side winding coil, and generates a leakage magnetic field of the same degree as that of the single two-side winding coil from the magnetic pole core at the end portion.

Therefore, if a single two-side-winding coil of a small capacity is used as a single two-side-winding coil used in the combined two-side-winding coil and an even number of the single two-side-winding coils are combined, the leakage magnetic field of the combined two-side-winding coil can be reduced. In addition, even in the case of using a single both-side-winding coil of a small capacity, by increasing the number of combined single both-side-winding coils, the capacity of the combined both-side-winding coil can be increased in proportion to the number of coils.

Fig. 9A and 9B show the results of measuring the leakage magnetic field of a combined double-side-wound coil (single double-side-wound coil having a power supply capacity of 6.25kW alone) in which 2 single double-side-wound coils were combined to supply 12.5kW of power. In this measurement, as shown in fig. 9A, the relationship between the distance from the reference point in the x direction and the y direction and the leakage magnetic flux density (μ T) was obtained with the center of 2 single both-side-wound coils combined as the reference point, and the result thereof is shown in fig. 9B.

For comparison, fig. 10A and 10B show the results of measuring the leakage magnetic field of a single bilateral winding coil unit supplied with 10kW of power. In this measurement, as shown in fig. 10A, the relationship between the distance from the reference point in the x direction and the y direction and the leakage magnetic flux density (μ T) is obtained with the center of the single both-side-wound coil as the reference point, and the result is shown in fig. 10B.

In fig. 11, the measurement results of fig. 9B and 10B are collected in a graph.

As can be seen from fig. 11, the combined double-side-winding coil in which 2 single double-side-winding coils are combined has a larger power supply than the single double-side-winding coil that supplies power of 10kW, but has a lower leakage flux than the single double-side-winding coil. The reduction ratio of the leakage magnetic flux in the coils wound on both sides becomes significant when the leakage magnetic flux is separated from the reference point (the center of the transformer) by 500mm or more.

The reason why the leakage flux is less by combining the both-side winding coils is that the power supply capability of the single both-side winding coil constituting the both-side winding coil is lower than that of the single both-side winding coil having the power supply capability of 10kW, and the leakage flux of 2 single both-side winding coils is cancelled. In addition, the supply power combining the both-side winding coils is large because the power supply capability of the single both-side winding coil of small capacity is enlarged by 2 times to exceed 10 kW.

Fig. 12 shows an equation of an approximate curve of the change in the magnetic flux density in the range of 500mm or more from the center of the transformer in fig. 11. The reduction of the leakage flux by the both-side winding coils is not only exhibited in the x direction, which is the arrangement direction of 2 single both-side winding coils, but also exhibited in the y direction, and is reduced to about 4 th power of the distance from the reference point.

For example, the international non-ionizing radiation protection committee (ICNIRP) publication "reference level (2010) for public exposure to time-varying electric and magnetic fields", which shows 2.7 × 10^-5The value of T is defined as the magnetic flux density in the frequency range of 3kHz to 10 MHz.

Such a standard, a stricter predetermined value of the leakage magnetic field determined in the company, and a non-contact power feeding transformer having a required capacity can be manufactured by the following procedure.

When a combined double-side-winding coil in which 2 single double-side-winding coils are combined is disposed at a position where the lower surface of the vehicle is disposed, a single double-side-winding coil in which the leakage flux around the vehicle does not exceed a predetermined value is selected. Next, the required number of the single both-side winding coils is obtained by dividing the required capacity of the non-contact power supply transformer by the capacity of the selected 1 single both-side winding coils, and the combined both-side winding coils are manufactured by combining the single both-side winding coils of the number.

In this case, it is very important to set the number of single double-side-winding coils combined into a combined double-side-winding coil to an even number in order to reduce the leakage magnetic flux. In addition, when the leakage magnetic field does not cause a problem, the combined double-side winding coil may be configured by an odd number (3 or more) of single double-side winding coils. Even when the number of single both-side-winding coils is an odd number of 3 or more, the leakage magnetic fields cancel each other out by the even number of single both-side-winding coils continuously provided inside the coil, and therefore, the increase of the leakage magnetic fields can be suppressed to some extent.

In this way, the system of winding the coils on both sides of the single stage array required for the combination can reduce the leakage magnetic flux, and can easily realize a large capacity by the number of combinations. Therefore, the production operability can be improved, and the production cost can be reduced.

In addition, when the coils wound on both sides in combination used for measuring the leakage magnetic field in fig. 9B are disposed at the installation position in the center of the vehicle bottom, the reference level of ICNIRP is sufficiently clarified in the leakage magnetic field at the outer periphery of the vehicle.

Fig. 13A to 13C show characteristic changes associated with positional shifts and gap fluctuations between the power transmission coil and the power receiving coil having the coupled double-sided winding coils. Fig. 13A shows changes in the power supply Power (PD), the power supply efficiency (η), the input Voltage (VIN), the coupling coefficient (k), and the output voltage (V2) when the range of ± 60mm changes in the x direction, fig. 13B shows changes in the values when the range of ± 150mm changes in the y direction, and fig. 13C shows changes in the values when the gap length is changed between 40mm and 90 mm. Here, the input Voltage (VIN) is adjusted in such a way that PD is fixed.

As is apparent from fig. 13A to 13C, the tolerance for the positional deviation and the gap variation of the contactless power supply transformer is large.

In the combined double-side-winding coil, the windings of the plurality of single double-side-winding coils can be connected in series or in parallel as shown in fig. 1A, 1B, 3A, and 3B, but in the case where the windings of the single double-side-winding coils 100 and 200 are connected in series as shown in fig. 1A and 1B, the same current flows through the windings, and therefore, even if the power transmission coil and the power reception coil including the combined double-side-winding coil are displaced, imbalance in the currents in the single double-side-winding coils 100 and 200 does not occur. However, when the windings are connected in series, the voltage between the terminals increases.

On the other hand, when the windings of the single double-wound coils 100 and 200 are connected in parallel as shown in fig. 3A and 3B, the voltage between the terminals is reduced to 1/2 when the coils are connected in series, which makes the operation easy, but when the power transmission coil and the power reception coil provided with the combined double-wound coils are displaced, there is a possibility that the currents flowing through the single double-wound coils 100 and 200 become unbalanced.

Therefore, even when the windings of the 2 single double-side-winding coils are connected in parallel in one of the transmission coil and the reception coil, it is preferable that the windings of the 2 single double-side-winding coils are connected in series in the other to obtain a balance of the current.

In addition, it is also possible: as shown in fig. 14A and 14B, 2 sets of 2 single bilateral winding coils are combined to form a combined bilateral winding coil, one of the transmission coil and the reception coil is, as shown in fig. 14A, connected in series with the windings of the 2 single bilateral winding coils of each set, and the windings of the 2 sets of single bilateral winding coils are connected in parallel, and the other of the transmission coil and the reception coil is, as shown in fig. 14B, connected in parallel with the windings of the 2 single bilateral winding coils of each set, and the windings of the 2 sets of single bilateral winding coils are connected in parallel. In this case, the series connection is also embedded in the parallel connection to obtain current balance.

As shown in fig. 15A and 15B, 2 single double-wound coils of 2 sets may be combined to form a combined double-wound coil. That is, as shown in fig. 15A and 15B, in both the transmission coil and the reception coil, the windings of the 2 single both-side-wound coils of each group are connected in series, and the windings of the 2 single both-side-wound coils of each group are connected in parallel. In this case, the series connection is also embedded in the parallel connection to obtain current balance.

In fig. 14A, 14B, 15A, and 15B, 2 single double-side-winding coil groups are shown as 2 groups, but 2 or more (m groups: m is a natural number) groups may be used.

In the coupled double-side wound coil, as shown in fig. 16, when the total width of the magnetic pole portions to be connected (the width in the arrangement direction of the single double-side wound coil) is D1 and the width of the magnetic pole portion positioned at the end of the coupled double-side wound coil is D2, D1 < 2 × D2 may be used.

In the position where the single both-side winding coil is adjacent to each other, the magnetic pole portions of the two single both-side winding coils are connected to each other to have a width 2 times as large, so that even if the width of each of the magnetic pole portions to be connected is narrowed to achieve weight reduction of the single both-side winding coil and shortening of the both-side winding coil, no trouble occurs.

In addition, even in the case where the coupled bilateral winding coil in which 2 single bilateral winding coils 100 and 200 are combined as shown in fig. 17A and 17B is opposed to the unilateral winding coil in which the wire 22 is wound flatly on one surface of the flat ferrite core 21, as shown in fig. 17A, a main magnetic flux circulating between the two is formed, and therefore, efficient non-contact power supply can be realized between the two. Therefore, the combined double-side-winding coil in which the single double-side-winding coils 100 and 200 are combined has interchangeability not only with respect to the combined double-side-winding coil having the same structure but also with respect to the single-side-winding coil. Fig. 17B is a top view of fig. 17A.

Note that, although the case where the single double-side-winding coil includes the H-shaped core is described here, the single double-side-winding coil may be a double-side-winding coil including a square core as shown in fig. 20B.

The non-contact power supply transformer according to the present invention can suppress a leakage magnetic field to a low level and can achieve a large capacity, and can be widely used for non-contact power supply of various moving bodies such as electric vehicles and plug-in hybrid vehicles.

Description of reference numerals:

10 … power transmission coil; 20 … power receiving coil; 21 … ferrite core; 31 … ferrite core; a 40 … H-shaped ferrite core; 41 … magnetic pole portion; 42 … pole piece; 43 … wound portion; a 50 … winding portion; 61 … square ferrite core; 62 … windings; 63 … a square ferrite core; 64 … windings; 65 … aluminum plate; 66 … aluminum plate; 67 … main magnetic flux; 68 … leakage flux; 69 … leakage flux; 80 … pole core; 81 … winding core; 82 … a lower ferrite plate; 100 … single two-sided wound coil; 150 … windings; 180 … pole core; 181 … winding core; 200 … single two-sided wound coil; 250 … winding; 280 … pole core; 281 … winding the core.

Claims (11)

1. A contactless power supply transformer for a mobile body, wherein,

the power transmission device is provided with a power transmission coil and a power receiving coil, wherein the power receiving coil is arranged at an installation position of a moving body, the moving body moves to a power supply position where the power receiving coil faces the power transmission coil to perform non-contact power supply,

at least one of the power transmission coil and the power reception coil is formed of a combined double-side winding coil in which a plurality of single double-side winding coils are combined, the single double-side winding coil having a winding wound around a wound portion between magnetic pole portions of the core,

the combined two-sided winding coil combines the single two-sided winding coil as follows: the wound portions of the plurality of single double-wound coils are arranged linearly, the magnetic pole portions of the adjacent single double-wound coils are connected to each other, and the directions of magnetic fluxes in the vertical direction from the connected magnetic pole portions toward the target coil are the same,

selecting a single double-sided winding coil in which leakage magnetic flux around the moving body does not exceed a predetermined value when a combined double-sided winding coil including 2 single double-sided winding coils is disposed at the installation position of the moving body,

the number of the single both-side winding coils combined into the combined both-side winding coil is set in such a manner that the product of the power supply capacity of 1 selected single both-side winding coil and the number satisfies the power supply capacity of the non-contact power supply transformer,

the single double-side-wound coil includes an H-shaped core in which the wound portion is disposed in a middle portion of the pair of magnetic pole portions arranged in parallel.

2. The contactless power supply transformer for a moving body according to claim 1, wherein,

the power receiving coil including the combined double-sided winding coil is provided at an installation position on a lower surface of the movable body such that an arrangement direction of the single double-sided winding coil of the combined double-sided winding coil coincides with a front-rear direction of the movable body.

3. The contactless power supply transformer for a moving body according to claim 1, wherein,

when the total width of the magnetic pole portions connected in the arrangement direction of the single double-side wound coil of the combined double-side wound coil is D1 and the width of the magnetic pole portion located at the end of the combined double-side wound coil is D2, D1 < 2 × D2.

4. A contactless power supply transformer for a mobile body, wherein,

the power transmission device is provided with a power transmission coil and a power receiving coil, wherein the power receiving coil is arranged at an installation position of a moving body, the moving body moves to a power supply position where the power receiving coil faces the power transmission coil to perform non-contact power supply,

at least one of the power transmission coil and the power reception coil is formed of a combined double-side winding coil in which a plurality of single double-side winding coils are combined, the single double-side winding coil having a winding wound around a wound portion between magnetic pole portions of the core,

the combined two-sided winding coil combines the single two-sided winding coil as follows: the wound portions of the plurality of single double-wound coils are arranged linearly, the magnetic pole portions of the adjacent single double-wound coils are connected to each other, and the directions of magnetic fluxes in the vertical direction from the connected magnetic pole portions toward the target coil are the same,

selecting a single double-sided winding coil in which leakage magnetic flux around the moving body does not exceed a predetermined value when a combined double-sided winding coil including 2 single double-sided winding coils is disposed at the installation position of the moving body,

the number of the single both-side winding coils combined into the combined both-side winding coil is set in such a manner that the product of the power supply capacity of 1 selected single both-side winding coil and the number satisfies the power supply capacity of the non-contact power supply transformer,

the power transmission coil and the power reception coil are each constituted by the combined double-side winding coil in which 2 single double-side winding coils are combined, the windings of the 2 single double-side winding coils are electrically connected in series in the combined double-side winding coil of one of the power transmission coil and the power reception coil, and the windings of the 2 single double-side winding coils are electrically connected in parallel in the combined double-side winding coil of the other of the power transmission coil and the power reception coil.

5. The contactless power supply transformer for a moving body according to claim 4, wherein,

the power receiving coil including the combined double-sided winding coil is provided at an installation position on a lower surface of the movable body such that an arrangement direction of the single double-sided winding coil of the combined double-sided winding coil coincides with a front-rear direction of the movable body.

6. A contactless power supply transformer for a mobile body, wherein,

the power transmission device is provided with a power transmission coil and a power receiving coil, wherein the power receiving coil is arranged at an installation position of a moving body, the moving body moves to a power supply position where the power receiving coil faces the power transmission coil to perform non-contact power supply,

at least one of the power transmission coil and the power reception coil is formed of a combined double-side winding coil in which a plurality of single double-side winding coils are combined, the single double-side winding coil having a winding wound around a wound portion between magnetic pole portions of the core,

the combined two-sided winding coil combines the single two-sided winding coil as follows: the wound portions of the plurality of single double-wound coils are arranged linearly, the magnetic pole portions of the adjacent single double-wound coils are connected to each other, and the directions of magnetic fluxes in the vertical direction from the connected magnetic pole portions toward the target coil are the same,

selecting a single double-sided winding coil in which leakage magnetic flux around the moving body does not exceed a predetermined value when a combined double-sided winding coil including 2 single double-sided winding coils is disposed at the installation position of the moving body,

the number of the single both-side winding coils combined into the combined both-side winding coil is set in such a manner that the product of the power supply capacity of 1 selected single both-side winding coil and the number satisfies the power supply capacity of the non-contact power supply transformer,

the power transmission coil and the power reception coil are each configured by the combined double-sided winding coil in which m sets of 2 single double-sided winding coils are combined, the windings of the 2 single double-sided winding coils of each set are electrically connected in series and the windings of the single double-sided winding coils of the m sets are electrically connected in parallel in the combined double-sided winding coil of one of the power transmission coil and the power reception coil, the windings of the 2 single double-sided winding coils of each set are electrically connected in parallel and the windings of the single double-sided winding coils of the m sets are electrically connected in parallel in the combined double-sided winding coil of the other of the power transmission coil and the power reception coil.

7. The contactless power supply transformer for a moving body according to claim 6, wherein,

the power receiving coil including the combined double-sided winding coil is provided at an installation position on a lower surface of the movable body such that an arrangement direction of the single double-sided winding coil of the combined double-sided winding coil coincides with a front-rear direction of the movable body.

8. A contactless power supply transformer for a mobile body, wherein,

the power transmission device is provided with a power transmission coil and a power receiving coil, wherein the power receiving coil is arranged at an installation position of a moving body, the moving body moves to a power supply position where the power receiving coil faces the power transmission coil to perform non-contact power supply,

at least one of the power transmission coil and the power reception coil is formed of a combined double-side winding coil in which a plurality of single double-side winding coils are combined, the single double-side winding coil having a winding wound around a wound portion between magnetic pole portions of the core,

the combined two-sided winding coil combines the single two-sided winding coil as follows: the wound portions of the plurality of single double-wound coils are arranged linearly, the magnetic pole portions of the adjacent single double-wound coils are connected to each other, and the directions of magnetic fluxes in the vertical direction from the connected magnetic pole portions toward the target coil are the same,

selecting a single double-sided winding coil in which leakage magnetic flux around the moving body does not exceed a predetermined value when a combined double-sided winding coil including 2 single double-sided winding coils is disposed at the installation position of the moving body,

the number of the single both-side winding coils combined into the combined both-side winding coil is set in such a manner that the product of the power supply capacity of 1 selected single both-side winding coil and the number satisfies the power supply capacity of the non-contact power supply transformer,

the power transmission coil and the power reception coil are each constituted by the combined both-side winding coil of 2 single both-side winding coils combined m groups, in the combined both-side winding coil, the windings of the 2 single both-side winding coils of each group are electrically connected in series respectively, and the windings of the m groups single both-side winding coils are electrically connected in parallel.

9. The contactless power supply transformer for a moving body according to claim 8, wherein,

the power receiving coil including the combined double-sided winding coil is provided at an installation position on a lower surface of the movable body such that an arrangement direction of the single double-sided winding coil of the combined double-sided winding coil coincides with a front-rear direction of the movable body.

10. A contactless power supply transformer for a mobile body, wherein,

the power transmission device is provided with a power transmission coil and a power receiving coil, wherein the power receiving coil is arranged at an installation position of a moving body, the moving body moves to a power supply position where the power receiving coil faces the power transmission coil to perform non-contact power supply,

at least one of the power transmission coil and the power reception coil is formed of a combined double-side winding coil in which a plurality of single double-side winding coils are combined, the single double-side winding coil having a winding wound around a wound portion between magnetic pole portions of the core,

the combined two-sided winding coil combines the single two-sided winding coil as follows: the wound portions of the plurality of single double-wound coils are arranged linearly, the magnetic pole portions of the adjacent single double-wound coils are connected to each other, and the directions of magnetic fluxes in the vertical direction from the connected magnetic pole portions toward the target coil are the same,

selecting a single double-sided winding coil in which leakage magnetic flux around the moving body does not exceed a predetermined value when a combined double-sided winding coil including 2 single double-sided winding coils is disposed at the installation position of the moving body,

the number of the single both-side winding coils combined into the combined both-side winding coil is set in such a manner that the product of the power supply capacity of 1 selected single both-side winding coil and the number satisfies the power supply capacity of the non-contact power supply transformer,

one of the power transmission coil and the power receiving coil is constituted by the combined double-side winding coil in which 2 single double-side winding coils are combined, and the other of the power transmission coil and the power receiving coil is constituted by a single-side winding coil in which an electric wire is wound flatly on one surface of a flat ferrite core.

11. The contactless power supply transformer for a moving body according to claim 10, wherein,

the power receiving coil including the combined double-sided winding coil is provided at an installation position on a lower surface of the movable body such that an arrangement direction of the single double-sided winding coil of the combined double-sided winding coil coincides with a front-rear direction of the movable body.