KR100976061B1 - Non-contact electric power supply device - Google Patents

Non-contact electric power supply device Download PDF

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Publication number
KR100976061B1
KR100976061B1 KR1020070099708A KR20070099708A KR100976061B1 KR 100976061 B1 KR100976061 B1 KR 100976061B1 KR 1020070099708 A KR1020070099708 A KR 1020070099708A KR 20070099708 A KR20070099708 A KR 20070099708A KR 100976061 B1 KR100976061 B1 KR 100976061B1
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South Korea
Prior art keywords
coil
primary
secondary
non
primary coil
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KR1020070099708A
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Korean (ko)
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KR20080031795A (en
Inventor
히데토시 마쯔키
다케시 사토
후미히로 사토
요시오 스즈키
기타오 야마모토
Original Assignee
고쿠리츠다이가쿠호진 도호쿠다이가쿠
쇼와 히코키 고교 가부시키가이샤
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Priority to JP2006273933A priority Critical patent/JP4356844B2/en
Priority to JPJP-P-2006-00273933 priority
Application filed by 고쿠리츠다이가쿠호진 도호쿠다이가쿠, 쇼와 히코키 고교 가부시키가이샤 filed Critical 고쿠리츠다이가쿠호진 도호쿠다이가쿠
Publication of KR20080031795A publication Critical patent/KR20080031795A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14Inductive couplings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12Inductive energy transfer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30Constructional details of charging stations
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/02Casings
    • H01F27/022Encapsulation
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/2871Pancake coils
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/34Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36Electric or magnetic shields or screens
    • H01F27/365Magnetic shields or screens
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00Coils
    • H01F5/003Printed circuit coils
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2270/00Problem solutions or means not otherwise provided for
    • B60L2270/10Emission reduction
    • B60L2270/14Emission reduction of noise
    • B60L2270/147Emission reduction of noise electro magnetic [EMI]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility
    • Y02T10/7005Batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage for electromobility
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y02T10/7088Charging stations
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/12Electric charging stations
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/12Electric charging stations
    • Y02T90/122Electric charging stations by inductive energy transmission
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies related to electric vehicle charging
    • Y02T90/14Plug-in electric vehicles

Abstract

SUMMARY OF THE INVENTION The present invention aims to propose a non-contact power feeding device that firstly improves charging efficiency, secondly realizes large gap, improves ease of use, and thirdly realizes miniaturization and weight reduction.
Further, the non-contact power supply device 6 of the present invention is used for charging a battery of an electric vehicle, for example, and based on the mutual induction action of electromagnetic induction, that is, the secondary side from the primary coil 7 on the power supply side, That is, electric power is supplied to the secondary coil 8 on the power receiving side. The primary coil 7 and the secondary coil 8 each have a set of parallel conductors of a plurality of strands, and have a structure wound in a spiral shape flat on the same plane, and are twisted at a constant pitch along the way. The primary magnetic core 13 and the secondary magnetic core 14, on which the primary coil 7 and the secondary coil 8 are disposed, are made of ferrite or the like to form a flat plate. Then, the surfaces of the primary coil 7 and the primary magnetic core 13 and the outer surfaces of the secondary coil 8 and the secondary magnetic core 14 are covered with the mold resin 17 and fixed, respectively. The foaming material 18 is mixed in the resin 17.

Description

Non-contact electric power supply device

The present invention relates to a non-contact power feeding device. That is, the present invention relates to a non-contact power feeding device based on the mutual induction action of electromagnetic induction. For example, the present invention relates to a non-contact power feeding device that charges a battery of an electric vehicle from outside without contact.

Technical background

Fig. 4 (1) is a perspective explanatory view for explaining the basic principle of the contactless power supply device of this kind conventional example. Regarding this basic principle, the conventional example and the present invention are common.

As shown in the figure, a non-contact power supply device 3 for supplying electric power from the primary coil 1 to the secondary coil 2 on the basis of the mutual induction action of electromagnetic induction is known in the art, for example, electric vehicles It is used to charge the battery.

That is, in the non-contact power feeding device, the primary coil 1 wound on the primary magnetic core 4 is disposed in a non-contact manner to the secondary coil 2 wound on the secondary magnetic core 5. Then, induction electromotive force is generated and supplied to the secondary coil 2 by the formation of magnetic flux in the primary coil 1.

《Leading Technology Literature Information》

As such a non-contact power feeding device 3, what was shown by following patent document 1, 2, 3 is mentioned, for example.

[Patent Document 1] Japanese Patent No. 3630452 (Japanese Patent Publication No. 6-256505)

[Patent Document 2] PCT International Publication No. 92/17929

[Patent Document 3] PCT International Publication No. 99/08359

《Private Technology》

Fig. 3 provides a description of this kind of conventional example, in which Fig. 1 is a plane on the primary side, that is, a view from above (also a plane on the secondary side, that is, a view from above), and Fig. 2 is on the primary side and on the second side. It is the front view of a vehicle side, ie, the view seen from the front, and drawing (3) is sectional drawing seen from the side surface, ie, the side of a primary side and a secondary side.

First, in this kind of non-contact power feeding device 3, the primary side A and the secondary side B form a symmetrical structure. In the non-contact power feeding device 3 of this type conventional example, the primary magnetic core 4 on the primary side A and the secondary magnetic core 5 on the secondary side B are each substantially U-shaped, for example. In addition, while forming the roughly E-shaped uneven | corrugated shape, many were arrange | positioned at the same plane at predetermined mutual space | interval, respectively. And for these primary magnetic core 4 and the secondary magnetic core 5, the primary coil 1 and the secondary coil 2 between the concave portions, respectively, as shown in FIG. It was wound in a square or round together.

And a pair of such primary side A and secondary side B are mutually arrange | positioned via the air gap C. Then, an induced electromotive force is generated in the secondary coil 2 by the formation of the magnetic flux D by excitating current to the primary coil 1, whereby the power is generated from the primary side A to the secondary side B. Was supplied to the battery, and the battery connected to the secondary side B was thereby charged.

By the way, the following problem was pointed out about the non-contact power feeding device 3 of such a conventional example.

First problem

First, for the non-contact power feeding device 3 of this type conventional example, further efficiency, that is, improvement in charging efficiency has been desired.

For example, since the primary and secondary magnetic cores 4 and 5 having irregularities are used in this type of conventional example, the magnetic flux D distribution is shown in the front explanatory diagram of FIG. 2 in FIG. 2. do. That is, in this type conventional example, the magnetic flux D in the air gap C between the primary side A and the secondary side B, which are disposed at the time of power feeding, is distributed so as to concentrate while bending toward the pole. Therefore, the magnetic flux D density becomes very high near the pole. Since the magnetic flux (D) density in the air and its magneto- motive force are proportional to each other, the magnetic flux (D) needs to have a large magnetic force due to its high density, so that a larger excitation current for the primary coil (1) As a result, the Joule heat loss has also increased, which is one of the causes of the decrease in the charging efficiency.

In addition, Joule heat loss due to the generation of eddy current has also been pointed out as a factor of lowering the charging efficiency. That is, an alternating magnetic flux D formed in a direction perpendicular to the ground passes through the primary coil 1 or the secondary coil 2 wound in a square. Thereby, since the loop current L which is a kind of eddy current flows between the coil wires (refer also to FIG. 2 of FIG. 2 mentioned later), Joule heat loss generate | occur | produced by that much.

For these two reasons, the non-contact power feeding device 3 of this kind of conventional example has a charge efficiency of about 86%, and thus energy saving has been demanded.

Second Problem

Second, more large-sized gaps are desired for the non-contact power feeding device 3 of this type conventional example.

That is, in this type of conventional example, as described above with reference to Fig. 3 in Fig. 2, since the magnetic flux D density in the air gap C is high, a large Joule heat loss is required by requiring such a large excitation current. There is a difficulty to cause. On the other hand, in order to improve the ease of use, in order to further widen the air gap C, an excessive excitation current is required.

As a result, in this type of prior art example in which the magnetic flux D is high, the air gap C is limited to about 50 mm, and a large gap is urgently desired.

That is, the primary side A and the secondary side B which are disposed at the time of power feeding are easy to use, so that the positioning operation for power feeding becomes easier, so that the air gap C between them is wider. On the other hand, as in this type of conventional example, the operation is cumbersome, such as the need to consider the collision avoidance between the primary side A and the secondary side B at the time of setup for power feeding. Accordingly, there has been a demand for large-sized gaps and further improvement in ease of use.

Third Problem

Third, further miniaturization and weight reduction are desired for the non-contact power feeding device 3 of this type conventional example.

Particularly, the secondary side B, also referred to as pickup, has been desperately desired to be miniaturized and lightweight in consideration of being always onboard for battery charging of electric vehicles such as a microbus. On the other hand, the thing of this kind conventional example was about 70 kg in weight, for example.

One reason for this is that in this type of conventional example, as described above, the uneven primary and secondary magnetic core cores 4 and 5 are used. As shown in Fig. 3 (2) and Fig. 3 (3), the thickness increased by the unevenness, which caused one of the increase in size and the increase in weight.

In addition, the secondary coil 2 and the secondary magnetic core 5 of the secondary side B, such as the primary coil 1 and the primary magnetic core 4 of the primary side A, are respectively radiated or positioned. It was covered with a mold resin for crystal fixation and fixed (see Fig. 2 in Fig. 1 to be described later). For this reason, the viscosity in which the weight of this mold resin becomes large has become one cause of weight increase.

<< about this invention >>

The non-contact power feeding device of the present invention has been made to solve the problems of the conventional example in view of such a situation of this kind of conventional example.

In addition, the present invention aims first to propose a non-contact power feeding device in which charging efficiency is improved, and secondly, large gap is realized, ease of use is improved, and third, miniaturization and light weight are also realized.

<< about each embodiment >>

Technical means of the present invention to solve the first, second, and third problems as described above are as follows. The first aspect is as follows.

The non-contact power feeding device of the first aspect is a device for supplying electric power from a primary coil to a secondary coil based on mutual inductive action of electromagnetic induction. The primary coil and the secondary coil may each have a structure wound in a spiral shape in the same plane, and the core core in which the primary coil is disposed and the core core in which the secondary coil is disposed may form a flat plate. It is done.

The second aspect is as follows. In the non-contact power feeding device of the second aspect, in the first aspect, the outer surface of the primary coil and the magnetic core thereof and the outer surface of the secondary coil and the magnetic core thereof are each covered and fixed with a mold resin. In the mold resin, a foaming material is mixed.

The third aspect is as follows. In the non-contact power feeding device of the third aspect, in the first aspect, the primary coil and the secondary coil are alternately arranged through an air gap at the time of power supply, and have the same symmetrical structure,

A magnetic path is formed in parallel between the primary coil and the secondary coil by the magnetic flux formation in the primary coil, and power is supplied from the primary coil to the secondary coil by induction electromotive force generated in the secondary coil. It is characterized by.

The fourth aspect is as follows. In the third aspect, the non-contact power feeding device of the fourth aspect is characterized in that the primary coil and the secondary coil are each wound a plurality of times spirally with a circular center as a circular space, and at the same time, form a thin flat shape. Non-contact feeder.

The fifth aspect is as follows. In the fourth aspect, the non-contact power feeding device of the fifth aspect is characterized in that, in the primary coil and the secondary coil, parallel conductors paralleled in plural strands are respectively wound in a spiral form.

The sixth aspect is as follows. In the fifth embodiment, the non-contact power feeding device of the sixth aspect is characterized in that the ratio between the outer diameter and the inner diameter is set to about 2: 1, respectively.

The seventh aspect is as follows. In the fifth embodiment, the non-contact power feeding device of the seventh aspect is characterized in that the primary coil and the secondary coil are each twisted at regular pitch intervals while keeping the parallel conductors of the plurality of strands wound flat.

The eighth aspect is as follows. In the third aspect, the non-contact power feeding device of the eighth aspect is characterized in that the primary coil is connected to a power source on the ground side, and the secondary coil is connected to an onboard battery.

<< about action >>

The action and the like of the present invention are as follows (1) to (9).

(1) In this non-contact power feeding device, the primary side and the secondary side are alternately arranged via the air gap during power feeding.

(2) Then, an excitation current flows in the primary coil, and as a result, a magnetic flux is formed, and thus an electromotive force is generated in the secondary coil because a magnetic path is formed between the primary coil and the secondary coil.

(3) As in (2), electric power is supplied from the primary side to the secondary side by mutual induction action of electromagnetic induction.

(4) On the other hand, in this non-contact power feeding device, a combination of a flat magnetic core and a flat spiral coil is employed. Therefore, the magnetic flux is parallel, evenly and coarsely distributed in the air gap at the time of power feeding, so that the magnetic flux density is lowered, so that the magnetic force for forming magnetic flux and the excitation current are small, and as a result, the Joule heat loss is also reduced.

(5) In addition, if the coil is twisted by a predetermined pitch in the middle, the electromotive force of the loop current, which is a kind of eddy current, cancels out, thereby reducing loop current and Joule heat loss.

(6) This non-contact power feeding device has a low magnetic flux density as described in (4), so that the magnetomotive force and the excitation current are small, and as a result, the air gap can be set as wide as that.

(7) Furthermore, when the ratio of the outer diameter to the inner diameter of the wound coil is about 2: 1, a high coupling coefficient is obtained, thereby maintaining strong electromagnetic coupling even when the air gap is widened.

(8) In addition, since this non-contact power feeding device adopts a flat magnetic core core and a flat coil, both the primary side and the secondary side become thinner, which makes them smaller and lighter.

(9) In addition, weight reduction is promoted by mixing a foam material in the mold resins on the primary side and the secondary side.

Therefore, the non-contact power feeding device of the present invention has the following effects.

<< first effect >>

Firstly, charging efficiency is improved. That is, the non-contact power feeding device of the present invention has a low magnetic flux density formed by combining a flat magnetic core and a flat spiral coil.

As a result, the magnetic field forming magnetic force and the excitation current are small, and as a result, the high efficiency is realized by reducing the heat loss.

Since the magnetic flux density is lower than this kind of conventional example described above, that is, the conventional example in which the coil is wound around the uneven magnetic core, the charging efficiency is improved and energy saving is achieved.

Second Effect

Secondly, large gapping is realized and the ease of use is improved. That is, the non-contact power feeding device of the present invention has a low magnetic flux density in the air gap by adopting a flat magnetic core and a flat spiral coil.

And since the magnetic flux density is low, the air gap between the primary side and the secondary side can be set wider for the ease of use. For example, since the magnetic flux density becomes coarse compared with the conventional example in which the coil is wound around the uneven magnetic core, the air gap can be set to that much.

Thus, since the large gap is realized, the positioning operation is easy between the primary side and the secondary side, which are opposed to each other during power feeding, and the ease of use is improved, such as consideration of collision avoidance is reduced.

<< third effect >>

Third, miniaturization and weight reduction are also realized. That is, the non-contact power feeding device of the present invention adopts a flat magnetic core and a flat coil to reduce the thickness and reduce the weight by half compared with the conventional example in which the coil is wound around the uneven magnetic core. In addition, since the foaming material is mixed in the heat dissipation and the positioning fixing mold resin, the weight thereof is also reduced.

By these two points, the weight of the secondary side, that is, the pickup, is about half of that of the conventional example. In addition, the pickup has a significant meaning of miniaturization and light weight, for example, in that it is always mounted as a battery for charging a microbus or other electric vehicle.

As in the first, second, and third, the effects of the present invention are remarkably large, such that all the problems of this kind of prior art are solved.

<< about drawing >>

EMBODIMENT OF THE INVENTION Hereinafter, the non-contact electric power feeding apparatus of this invention is demonstrated in detail based on the best form for implementing invention shown in drawing.

1 and 2 provide a description of the best mode for practicing the present invention. 1 is a plane on the primary side, that is, a cross-sectional view from above (a plane on the secondary side, that is, a cross-sectional view from above), and FIG. Side view, ie from the side).

FIG. 2 is a front explanatory view of the front of the electromagnetic coupling, that is, a front view (side view, that is, a side view), FIG. 2 is a front explanatory view of the magnetic flux distribution, and FIG. 4 is a plane of the eddy current. It is explanatory drawing, Drawing 5 is explanatory drawing of a torsion coil. Fig. 4 (2) is a block diagram of an application example of the non-contact power feeding device of the present invention.

<< summary of the non-contact power supply device 6 >>

First, the non-contact power supply device 6 will be outlined with reference to FIG. 2 (1), FIG. 4 (2), and the like.

In the non-contact power supply device 6, a general configuration for supplying electric power based on mutual induction of electromagnetic induction is commonly known. That is, the magnetic flux D in the primary coil 7 between the primary coil 7 on the primary side F and the secondary coil 8 on the secondary side G, which are approached and replaced at the time of power feeding. It is well-known to send electric power from the primary coil 7 to the secondary coil 8 by the principle of generating the induced electromotive force in the secondary coil 8 by forming ().

And, as shown in the representative application example of FIG. 4 of FIG. The electric power is sent to the side, i.e., to the secondary side G, by alternately arranging the air gap C, which is a space of physical connection or void, at the time of power feeding.

The secondary side G is connected to the onboard battery 10, for example. Therefore, the motor 11 of the car is driven by the battery 10 charged by the power feeding. 12 is a power supply communication control device.

The mutual induction action of the above-mentioned electron induction is as described below. That is, the primary coil 7 on the primary side F and the secondary coil 8 on the secondary side G are disposed in a non-contact manner. Then, when an alternating current is supplied to the primary coil 7 as an excitation current, a magnetic field proportional to the current is generated on the axis so that the magnetic flux D is formed in a ring shape in a right angle direction. The magnetic flux D thus formed and changing passes through the secondary coil 8 and chains to generate an electromotive force in the secondary coil 8.

As described above, both circuits of the primary coil 7 and the secondary coil 8 that form a magnetic field and transmit electric power by using the magnetic field have magnetic paths of the magnetic flux D as shown in FIG. Formed and electronically bonded. The height of the mutual coupling coefficients varies depending on the position, shape, dimensions, distance dimension of the air gap C, leakage amount of the magnetic flux D, and the like of the primary and secondary coils 7 and 8.

The outline of the non-contact power supply device 6 is as described above.

<< structure of primary side (F) and secondary side (G) >>

Next, with reference to the drawing (1) of FIG. 1, FIG. 2, the symmetric structure and internal structure of the primary side F and the secondary side G are demonstrated.

First, as shown in Fig. 2 of FIG. 2, the non-contact power feeding device 6 has the same structure of symmetry such that the primary side F and the secondary side G are up and down at the time of feeding, as in the conventional example. To achieve. In other words, the non-contact power supply device 6 includes a primary side F, a primary coil 7, a primary magnetic core 13, a back board 15, a cover 16, and the like. The secondary side G is equipped with the secondary coil 8, the secondary magnetic core 14, the back board 15, the cover 16, etc.

The primary side F and the secondary side G form the same structure of vertical symmetry, when they are placed upside down, for example, at the time of power feeding. The primary side F and the secondary side G each cover the cover 16, the primary coil 7 (secondary coil 8), and the primary magnetic core 13 (2) from the inner side to the outer side of the symmetry plane. The primary magnetic core 14) and the back board 15 are arranged in this order.

In addition, the internal structure of the primary side F and the secondary side G is as follows. The outer exposed entire outer surface of the primary coil 7 and the primary magnetic core 13 on the primary side F and the outer surfaces of the secondary coil 8 and the secondary magnetic core 14 are each molded resin. It is fixed by covering with (17).

That is, in the example shown to the drawing (2) of FIG. 1, the mold resin 17 is filled between the back board 15 and the cover 16 in both the primary side F and the secondary side G. As shown in FIG. Therefore, the outer surface of the inner primary or secondary coils 7 and 8 and further, the primary or secondary magnetic core cores 13 and 14 is fixed by covering with the mold resin 17.

The mold resin 17 is made of silicone resin, for example. And the mold resin 17 hardens the inside, positioning and fixing the primary and secondary coils 7 and 8, respectively, ensuring the mechanical strength, and also exhibits a heat radiating function. That is, the primary and secondary coils 7 and 8 generate heat by Joule heat as the excitation current flows, but are cooled by heat radiation by the heat conduction of the mold resin 17.

In the mold resin 17, the foam material 18 is mixed and buried. The foam material 18 is made of foamed styrol or other foamed plastic, for example, and is used to reduce the amount of the mold resin 17 to reduce the weight.

In the example shown in FIG. 1, such a foam material 18 is cast in the shape of a round and round circular blade at the inside and the outside of the primary and secondary coils 7, 8. 1 may be mixed in the mold resin 17 without being in accordance with the example shown in FIG. 1.

The structures of the primary side F and the secondary side G are as described above.

<< about primary and secondary coils 7 and 8 and primary and secondary magnetic cores 13 and 14 >>

Next, the primary and secondary coils 7 and 8 and the primary and secondary magnetic core cores 13 and 14 will be described with reference to FIGS. 1 and 2.

The primary coil 7 and the secondary coil 8 each have a structure in which the conductors are wound in a spiral shape in the same plane. The primary magnetic core 13 and the secondary magnetic core 14, on which the primary coil 7 and the secondary coil 8 are disposed, are each flat.

These will be described in more detail. First, the primary and secondary magnetic core cores 13 and 14 are typically made of ferrite, solid iron, and other ferrous materials, and are ferromagnetic materials having a high permeability, and thus have strong magnetic flux (D). Demonstrates speech and guide functions. That is, the primary magnetic core core 13 and the secondary magnetic core core 14 increase the inductance between the primary coil and the secondary coil 8 to enhance the electromagnetic coupling between each other and at the same time induce the formed magnetic flux D. Function to collect, collect, and orient.

The primary and secondary magnetic cores 13 and 14 form a flat flat plate without irregularities, respectively, as shown in FIG. Therefore, as shown in FIG. 2 (2) of FIG. 2, the magnetic flux D distribution of the magnetic path formed by uniformizing as a whole between the primary side F and the secondary side G without being dotted and omnipresent is parallel and even. do. Therefore, the ubiquity and concentration of the magnetic flux D are avoided (compared with the drawing (3) of FIG. 2 concerning this kind of prior art example).

Correspondingly, the primary and secondary coils 7 and 8 are wound spirally in the same plane to form a circular flat shape.

That is, as shown in FIG. 1, the primary and secondary coils 7 and 8 each have a plurality of conductors in parallel to reduce joule heat loss, and at the same time, the insulated parallel conductors are wound in a circular space ( H) is made by winding a number of times in a spiral. Accordingly, the primary coil 7 and the secondary coil 8 each have a round ring flange shape and a thin flat shape. Such primary or secondary coils 7 and 8 are disposed in close proximity to the symmetrical front sides of the corresponding primary or secondary magnetic core cores 13 and 14, respectively. In the example of city, the contact is disposed.

1, the ratio of the outer diameter J and the inner diameter K is about 2: 1 for the primary and secondary coils 7 and 8 wound in this manner, respectively. It is set. By such setting, the coupling coefficient between the primary coil 7 and the secondary coil 8 becomes a high value. This point is also proven by experiments. Thus, the electromagnetic coupling between the primary coil 7 and the secondary coil 8 is strongly maintained even if the air gap C between them is widened.

In addition, the primary and secondary coils 7 and 8 wound in this way are twisted in the middle of each pitch interval. That is, for the wound primary and secondary coils 7 and 8, as shown in FIG. 2 of FIG. 2, the alternating magnetic flux D (change in response to alternating current of an excitation current) in a direction perpendicular to the ground Accompanied alternating magnetic flux (D) is passed through the loop of the loop current (L), which is a kind of eddy current between the coil wire is induced to cause Joule heat loss.

Therefore, in these primary and secondary coils 7 and 8, as shown in FIG. 2 of FIG. 2, the wound coil parallel conducting wires of the multiple strands are twisted at regular pitch intervals while maintaining flatness, respectively. have. That is, twisting is performed to return to the original positional relationship by m twists by converting the positional relationship between the coil wire plural strands m strands one by one in sequence for each torsional point M. The torsion point M is formed in 5-6 pitches, for example per week of winding.

Such twisting cancels the electromotive force of the loop current L, so that the loop current L and the Joule heat loss are greatly reduced.

The primary and secondary coils 7 and 8 and the primary and secondary magnetic core cores 13 and 14 are thus made.

<< action >>

The non-contact power feeding device 6 of the present invention is configured as described above. Therefore, the effect | action of this invention etc. become as follows (1)-(9).

(1) In this non-contact power supply device 6, the power supply side provided with the primary coil 7 and the primary magnetic core 13, etc. at the time of power supply, that is, the primary side F, the secondary coil 8, and the secondary The power receiving side, that is, the secondary side G provided with the magnetic core core 14 and the like, is disposed to be replaced via the air gap C.

(2) Then, when an alternating current is supplied to the primary coil 7 on the primary side F as an exciting current, a magnetic flux D is formed (see FIG. 2 in FIG. 2).

Thus, the magnetic path of the magnetic flux D is formed between the primary coil 7 on the primary side F and the secondary coil 8 on the secondary side G. Due to the formed magnetic path, the primary coil 7 and the secondary coil 8 are electromagnetically coupled between the respective circuits, at the same time a magnetic field is formed between them, and the magnetic flux D penetrates the secondary coil 8. An electromotive force is generated in the difference coil 8.

(3) In this non-contact power supply device 6, electric power is supplied from the primary side F to the secondary side G by the mutual induction action of electromagnetic induction in this manner.

That is, after the electric power is supplied from the external power source 9 and from the primary side F connected to the power source 9, the battery 10 taken out to the secondary side G and connected thereto is charged. (See Figure 2 of FIG. 4).

(4) Thus, in this non-contact power feeding device 6, the following is obtained. First, in this non-contact power supply device 6, the primary and secondary coils 7 and 8 wound in a spiral shape flat with the primary and secondary magnetic core cores 13 and 14 on the plate are employed in combination.

Therefore, in the magnetic path in the air gap C between the primary side F and the secondary side G, which are disposed at the time of feeding, the magnetic flux D becomes parallel, evenly and sparsely distributed, so that the magnetic flux D density is high. It becomes low (the comparison of the drawing (2) of FIG. 2 and the drawing (3) of FIG. 2 concerning this kind conventional example).

The density of magnetic flux (D) in the air and the magnetic force forming the magnetic flux (D) are in proportional relationship. Therefore, due to the low magnetic flux D density, the magnetic field force for forming magnetic flux D and the excitation current are small, and as a result, the Joule heat loss of the circuit is reduced accordingly.

Therefore, for example, when the magnetic flux D of the same density is formed, the magnetomotive force, the excitation current, and the continuation loss of the present invention are much smaller than the above-described conventional examples of this kind.

(5) Furthermore, the reduction of the Joule heat loss is further promoted by twisting the primary and secondary coils 7 and 8 of the non-contact power feeding device 6 at a torsional point M at a constant pitch (Fig. See drawing 5 of 2.

That is, such twisting causes the loop current L and the Joule heat loss to be significantly reduced by canceling the electromotive force of the loop current L (see FIG. 2 in FIG. 2), which is a kind of eddy current.

For example, based on the above aspects of (4) and (5), the non-contact power feeding device 6 is highly efficient up to 92% with respect to 86% of this type of conventional example as described above.

(6) In addition, since this non-contact power feeding device 6 employs a combination of flat primary and secondary magnetic cores 13 and 14 and flat spiral primary and secondary coils 7 and 8, As described above, the magnetic flux D has a low density, and thus the magnetic force and excitation current for forming the magnetic flux D are small.

Therefore, it becomes possible to set the air gap C between the primary and secondary coils 7 and 8 as wide as that. For example, in the case of an excitation current of the same value, the present invention can set the air gap C to be wider than the above-described conventional example of this kind. Therefore, this invention can multiply the air gap C by 100 mm compared with this kind of prior art example in which the air gap C was about 50 mm.

(7) In addition, this point is about 2: 1 ratio of the outer diameter J and the inner diameter K with respect to the primary and secondary coils 7 and 8 of this non-contact power feeding device 6 wound in a spiral shape. It can be realized by doing so.

That is, since a high coupling coefficient is obtained between the primary and secondary coils 7 and 8 by this, strong electromagnetic coupling between both is maintained even if the air gap C is widened.

(8) In addition, since this non-contact power supply device 6 adopts the flat primary and secondary magnetic cores 13 and 14 and the flat primary and secondary coils 7 and 8, the primary side F And both of the secondary side G have a thin thickness E, which is reduced in size and weight. (Comparatively contrasts the drawing (2) of FIG. 1 with the drawing (2) and drawing (3) of FIG. 3 according to this kind of conventional example). ). The thickness E is halved compared with this kind of conventional example described above.

(9) In addition, the weight reduction of the non-contact power feeding device 6 is achieved by mixing the foam material 18 in the mold resin 17 on the primary side F and the secondary side G (see FIG. 1). Further promoted. In other words, the amount of filling of the mold resin 17 is reduced by the amount of the foam material 18 mixed therein, thereby further reducing the weight.

For example, on the basis of the above aspects of (8) and (9), the non-contact power feeding device 6 has a weight of 35 kg for the secondary side B, that is, the weight of the pickup is about 70 kg of this kind of conventional example described above. It is halved enough.

"Etc"

In addition, according to the above description based on the drawing (2) of FIG. 1, FIG. 2, FIG. 4, etc., the primary coil 7 and the secondary coil 8 are all wound in the shape of a spiral wound flat on the same surface. do. At the same time, the primary magnetic core 13 and the secondary magnetic core 14, on which the primary coil 7 and the secondary coil 8 are disposed, had a flat plate structure.

However, the non-contact power supply device 6 can be considered as follows, regardless of the configuration of such a coil or core.

That is, only one of the primary coils 7 and the secondary coils 8, for example, only the primary coils 7 (or the secondary coils 8) are wound in a spiral shape flat in the same plane as described above. Shall be. At the same time, a configuration in which only one primary magnetic core 13 (or secondary magnetic core 14) on which the primary coil 7 (or secondary coil 8) is disposed can be considered to have a flat plate structure. have.

In this case, the other structure in which such a structure and a structure are not employ | adopted is the secondary coil 2 (or primary coil 1) of this kind conventional example mentioned above, and the secondary magnetic core core 5 which forms uneven | corrugated shape (or Primary magnetic core 4) can be used. Other coils and cores can also be used.

As such a structure example, the non-contact power supply apparatus of the structure which employ | adopted as the primary side the primary magnetic core 13 of the structure which forms the plate shape with the primary coil 7 of the structure wound by the spiral shape flatly on the same plane as the primary side. You can think of (6).

In this case, such a primary side can be established and applied as a structure which is independent or independent of a secondary side. For the non-contact power supply device 6 as described above, the functions, functions, effects, and the like thereof are applied mutatis mutandis based on the examples shown.

As such, wider application of the inventive idea is conceivable.

FIG. 1 provides a description of the best mode for carrying out the invention for the non-contact power feeding device of the present invention, and FIG. 1 shows a plane on the primary side, that is, a sectional view from above (a plane on the secondary side, that is, a sectional view from above). 2 is a front view of the primary side (secondary side), that is, a sectional view seen from the front (side, that is, viewed from the side).

Fig. 2 provides a description of the best mode for carrying out the invention, and Fig. 1 is a cross-sectional explanatory view of the front side of the electromagnetic coupling, that is, the front side (the side, ie the side view), and Fig. 2 is the magnetic flux. Front explanatory drawing of distribution, Drawing 4 is a plan explanatory drawing of eddy current, Drawing 5 is a plan explanatory drawing of a torsion coil. 3 is a front explanatory drawing of the magnetic flux distribution of this kind of conventional example.

Fig. 3 provides a description of this kind of conventional example, in which Fig. 1 is a plan view of the primary side (a plan view of the secondary side), Fig. 2 is a front view of the primary side and the secondary side, and Fig. 3 is the primary side. And a side view of the secondary side, that is, a sectional view seen from the side.

Fig. 4 provides a description of the non-contact power feeding device, Fig. 1 is a perspective explanatory diagram of the basic principle, and Fig. 2 is a block diagram of an application example.

Explanation of the sign

1 primary coil (conventional example)

2 secondary coils (conventional example)

3 non-contact power feeding device (conventional example)

4 Primary magnetic core (conventional example)

5 2nd core core (conventional example)

6 non-contact power feeding device (invention)

7 Primary Coil (Invention)

8 secondary coil (invention)

9 power

10 batteries

11 motor

12 Communication Control Device

13 primary magnetic core (invention)

14 Secondary core core (invention)

15 backboard

16 covers

17 mold resin

18 foam

 A Primary side (conventional example)

 B secondary side (conventional example)

 C air gap

 D flux

 E thickness

 F primary side (invention)

 G secondary side (invention)

 H circular space

 J outer diameter

 K bore

 L loop current

 M torsion point

Claims (8)

  1. In the non-contact power supply device for supplying power from the primary coil to the secondary coil based on the mutual induction action of the electromagnetic induction,
    The primary coil and the secondary coil have a structure wound in a flat shape and a spiral in the same plane, respectively, the magnetic core core is the primary coil is excreted and the magnetic core core is the secondary coil is formed of a flat plate,
    The outer surface of the primary coil and its magnetic core and the outer surface of the secondary coil and its magnetic core are covered and fixed inside a mold resin filled between a backboard and a cover, respectively, and a foam material is contained in the mold resin. Mixed,
    The primary coil and the secondary coil are replaced by an air gap at the time of power supply, and have the same symmetrical structure.
    A magnetic path is formed in parallel between the primary coil and the secondary coil by the formation of magnetic flux in the primary coil, and power is supplied from the primary coil to the secondary coil by generating induced electromotive force in the secondary coil. ,
    In the primary coil and the secondary coil, parallel wires paralleled into a plurality of strands are wound in a spiral multiple times with the winding center as a circular space, and the ratio between the outer diameter and the inner diameter is set to 2: 1,
    The primary coil and the secondary coil are each twisted at constant pitch intervals while the coil parallel conductors of the wound multiple strands are flat, and the twist is sequentially performed in the positional relationship between the coil strands and the multiple strands at each twisting point. A non-contact power feeding device, wherein the non-contact power supply unit is configured to return to the original positional relationship by a plurality of twists by converting one by one.
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  7. delete
  8. The non-contact power supply device according to claim 1, wherein the primary coil is connected to a power source on the ground side, and the secondary coil is connected to a vehicle battery.
KR1020070099708A 2006-10-05 2007-10-04 Non-contact electric power supply device KR100976061B1 (en)

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JP2006273933A JP4356844B2 (en) 2006-10-05 2006-10-05 Non-contact power feeding device
JPJP-P-2006-00273933 2006-10-05

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TWI376856B (en) 2012-11-11
CN101179208A (en) 2008-05-14

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