JP2001309501A - Noncontact power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noncontact power supply device in which a region for performing power supply operation is enlarged. SOLUTION: An arm 3b stretching to the outside from both ends of a primary core 3 whose longitudinal section is formed in a C-shape is installed, so that the transversal width of a power supply head 1 is constituted to be wide. As a result, magnetic flux can be interlinked with a secondary core 4 in a continuous and wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a power supply apparatus for supplying electric power to electric equipment or the like in a non-contact manner by electromagnetic induction.

[0002]

2. Description of the Related Art A transfer device is well known as an electric device using a contact-type power supply device. As the contact power supply device used in the transport device, for example, a trolley wire is routed to a power supply side (primary side), and a brush provided on a power receiving side (secondary side) on which an object is mounted and moves is mounted on the trolley. Power was supplied from the primary side to the secondary side by contacting the wires.

However, in such a contact power supply device, when the trolley wire and the brush come into contact with each other, the carbon powder is scattered into the atmosphere, so that it is used in a clean room or means for transporting food, so-called clean and sanitary. It was very difficult to use it in places where it was necessary to secure the condition.

Further, since the trolley wire and the brush are worn due to contact, it is extremely uneconomical, for example, frequent maintenance and replacement of parts are required to continue good power supply operation.

In order to solve the above-mentioned problem, various non-contact power supply devices have been developed.
As a non-contact power supply device used for current transport equipment,
A litz wire (electric wire for reducing the skin effect of high-frequency current) is connected to a high-frequency current source installed on the primary side, and a current is caused to flow through this litz wire to induce a magnetic flux. A current transformer type in which power is supplied to a load on the secondary side by linking is generally used.

In such a non-contact power supply device of the current transformer type, the high-frequency current source and the litz wire on the primary side are very expensive.
The litz wire had to be routed with high precision so as not to come into contact with the core on the secondary side, which required much labor and time and was troublesome.

In view of this, the present inventor has disclosed in the specification of Japanese Patent Application No. 2000-073423, which has already filed a patent application, an inexpensive and simple configuration without using an expensive high-frequency current source or litz wire. A contact power supply was proposed.

[0008]

However, the above-mentioned Japanese Patent Application No.
The non-contact power supply device described in the specification of 00-073423 performs a power supply operation at a fixed position on a factory line (a power supply operation performed in a state where the power supply side and the power reception side are stopped (fixed) without relatively moving). Is very useful for, for example,
As in the case of the transfer device, the power supply operation to the power receiving side that moves relatively to the power supply side cannot be performed.

Therefore, the present invention has been made in view of the above-mentioned problems,
On the receiving side that moves relatively to the feeding side, in a continuous state,
In addition, a contactless power supply device capable of supplying electric power without contact is provided.

[0010]

According to a first aspect of the present invention, there is provided a contactless power supply device, wherein a main body of a primary core of a coupling transformer is formed in a C shape, and the main body formed in the C shape and a leg of the main body are formed. The primary core was constituted by arms extending outward from both ends of the core.

According to a second aspect of the present invention, the main body of the secondary core of the coupling transformer is formed in a C-shape, and the main body formed in the C-shape and extending outward from both ends of the legs of the main body. A secondary core was constituted by the protruding arms.

According to a third aspect of the present invention, there is provided a non-contact power supply device according to the first and second aspects, wherein a primary core and a primary winding are provided on a primary side of the coupling transformer;
Further, a plurality of power supply circuits for supplying a high-frequency alternating current to the primary winding are provided.

According to a fourth aspect of the present invention, there is provided the non-contact power supply device according to the third aspect, wherein power is supplied to the primary side of the coupling transformer such that the alternating current flowing through the plurality of primary windings is synchronized. An oscillator circuit for controlling the circuit was provided.

According to a fifth aspect of the present invention, there is provided the non-contact power supply device according to the first to fourth aspects, further comprising a power receiving head having a secondary core and a secondary winding on a secondary side of the coupling transformer. Multiple power receiving circuits were installed.

According to a sixth aspect of the present invention, there is provided the contactless power supply device according to any one of the first to fifth aspects, wherein the power receiving head provided on the secondary side of the coupling transformer is connected to the plurality of power supply heads provided on the primary side. In a state where the armatures extend outward from both ends of the legs of the primary core, the armatures are configured to move in parallel in the same direction with the arm portions extending outward from both ends of the primary core. Continuous power can be supplied to the next side.

According to a seventh aspect of the present invention, there is provided the non-contact power supply device according to any one of the first to sixth aspects, wherein a leakage magnetic flux interlinking between the legs of the primary core of the coupling transformer is generated by eddy current. A leak magnetic flux adjusting function element made of a non-magnetic metal to be reduced by was inserted.

According to an eighth aspect of the present invention, in the non-contact power supply device according to the seventh aspect, the thickness of the magnetic flux adjusting function element is set to 1 mm or more.

According to a ninth aspect of the present invention, the power supply head provided on the primary side of the coupling transformer has a surface facing the secondary core, and The power supply head is provided with a casing formed of a nonmagnetic metal except for the surface adjacent to the power supply heads.

According to a tenth aspect of the present invention, there is provided the non-contact power feeding device according to the first to ninth aspects, wherein the power receiving head provided on the secondary side of the coupling transformer is located outside both ends of the legs of the secondary core. The casing was provided with a casing formed of a nonmagnetic metal except for the end face of the extending arm and the face facing the primary core.

In the contactless power supply device of the present invention, the primary core and the secondary core of the coupling transformer extend outwardly from both ends of a main body having a C-shaped longitudinal section and legs of the main body. By configuring the arm, the magnetic flux induced in the primary core can be linked to the secondary core in a wide range.

Further, the non-contact power supply device of the present invention is provided with a plurality of primary cores and a plurality of power supply circuits for supplying a high-frequency alternating current, so that the power supply circuits are operated synchronously. The power supply operation can be performed satisfactorily in the continuous range of.

Further, the non-contact power supply device of the present invention has a plurality of secondary cores and a plurality of power receiving circuits, so that
If the secondary core and the power receiving circuit are moved in parallel while facing the secondary core, power can be sequentially and continuously supplied from the primary side to a plurality of loads on the secondary side, which is convenient. It is.

Further, in the contactless power supply device of the present invention, a magnetic flux adjusting function element made of a nonmagnetic metal is installed between the legs of the primary core, and the casing on the primary side of the coupling transformer is connected to the secondary side. Except for the surface facing the core and the surface on which the primary sides of the plurality of coupling transformers are adjacent to each other, the casing on the secondary side of the coupling transformer is formed of a leg of the secondary core. The magnetic flux induced on the primary side of the coupling transformer can be efficiently reduced by constructing the end face of the arm extending outside from both ends and the face other than the face facing the primary core with a nonmagnetic metal. Can link to the next side.

[0024]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a diagram showing a state in which a power supply head 1 and a power reception head 2 constituting a non-contact power supply device of the present invention are arranged facing each other. FIGS. 2 and 3 are front views showing the power supply head 1 and the power reception head 2, respectively. It is.

In FIGS. 1, 2, and 3, reference numerals 3a and 4a denote main bodies constituting the primary core 3 and the secondary core 4 of the coupling transformer, and have a C-shaped longitudinal section. 3b, 4b
Are arms extending outward from both ends of the legs of the main bodies 3a, 4a of the primary core 3 and the secondary core 4. The arms extend from the primary side to the secondary side in order to realize a wide range of power supply operation. The range of interlinkage of magnetic flux to is expanded.

2 and 3, the length of the arm 4b of the secondary core 4 is shorter than that of the arm 3b of the primary core 3 because the secondary side is a movable body. And weight.

However, the length of the arm 3b of the primary core 3 should be longer than a predetermined length due to limitations on the size of the core, the method of manufacturing the core, the yield of the core, and the like. Of course, this is not possible, and it is necessary to provide a plurality of the power supply heads 1 in order to configure a required power supply range.

Further, 5, 6 shown in FIGS.
Are the primary and secondary windings of the coupling transformer, and 7, 8
Is a bobbin attached to the yoke of the primary core 3 and the secondary core 4 for winding the primary winding 5 and the secondary winding 6. Reference numeral 9 denotes a leakage flux adjusting function element (hereinafter, referred to as a flux barrier) attached to the primary core 3, which reduces the leakage flux by using an eddy current induced by the leakage flux. An example is shown.

As shown in FIG. 4, the flux barrier 9 has a C-shaped longitudinal section, and an insertion hole 10 through which a leg of the main body 3a of the primary core 3 is inserted at the center in the longitudinal direction. Are formed, and the material is made of a non-magnetic metal.

Then, the flux barrier 9 covers the arms 3b of the primary core 3 in the concave grooves 9a so as to cover the end faces of the arms 3b and the faces other than the faces facing the secondary core. Accommodating.

Numeral 11 denotes a box-shaped casing which accommodates the primary side (primary core 3, flux barrier 9, primary winding 5, bobbin 7) of the coupling transformer and has an open front and side surfaces. This is a casing having the same structure as the casing 11, which accommodates the secondary side of the transformer (primary core 4, secondary winding 6, bobbin 8).

The two casings 11 and 12 have a surface on which the open sides of the casings 12 and 11 are located opposite to each other, and a surface on which a plurality of power supply heads 1 are adjacent to each other. Is 2
The surface other than the surface parallel to the end surface of the arm portion 4b of the next core 4 is formed of a nonmagnetic metal.

It should be noted that the surface of the casing 11 where the plurality of power feeding heads 1 provided adjacent to each other are adjacent to each other
The reason why the surface parallel to the end surface of the arm portion 4b of the secondary core 4 is not formed of a nonmagnetic metal is that the power feeding head 1 and the power receiving head 2
This is because the magnetic flux can be interlinked from other than the surfaces facing each other.

The power feeding head 1 and the power receiving head 2 configured as described above are arranged as shown in FIG. 5 (a plurality of power feeding heads 1 are provided side by side, and the power receiving heads 2 pass in front of the power feeding heads 1 provided together. ), The magnetic flux induced in the primary core 3 of the power supply head 1 is favorably linked to the secondary core 4 of the moving power receiving head 2, and the electric power is supplied in a non-contact manner by the electromagnetic induction action. Can be supplied.

At this time, the magnetic flux induced in the primary core 3 of the power supply head 1 passes through the flux barrier 9 and the casing 11 and leaks in a direction connecting the outside and the legs of the primary core 3. Since a part of the flux barrier 9 and the casing 11 are formed of a non-magnetic metal, when the magnetic flux passes through the flux barrier 9 and the casing 11, the flux barrier 9
An eddy current is generated in the casing 11 and in a direction obstructing the leakage magnetic flux (see FIG. 6).

The generation of the eddy current induces a magnetic flux in a direction opposite to the leakage magnetic flux in the flux barrier 9 and the casing 11, so that the magnetic flux leaks out of the casing 11 and the space between the legs of the primary core 3. Can reduce the interlinking magnetic flux. As a result, the magnetic flux induced in the primary core 3 is efficiently transferred to the secondary core 4 as shown in FIG.
And the power can be satisfactorily supplied to the power receiving side.

FIG. 8 shows a power supply unit 13 connected to the plurality of power supply heads 1 and a power reception unit 14 connected to the moving power reception head 2. The power supply unit 13 is a primary winding shown in FIG. The same number (three in FIG. 8) of power supply circuits 15 as the number of power supply heads 1 for supplying a high-frequency alternating current to the wire 5 and the high-frequency alternating current are synchronized between the primary windings 5 constituting each power supply head 1. It comprises an oscillation circuit 16 and is connected to an AC power supply 17.

On the other hand, the power receiving unit 14 is connected between the power receiving head 2 disposed with a gap between the power receiving head 2 and the load 18 and includes, for example, a resonance capacitor (not shown) and an overvoltage protection circuit. Have been. In FIG. 8, the power receiving head 2, the power receiving unit 14, and the load 1
8 (hereinafter, collectively referred to as secondary units) has been described, but the present invention may be configured to include a plurality of the secondary units.

Next, the configuration of the power supply unit 13 will be described in detail with reference to FIG. FIG. 9 shows an example of the configuration of the power supply unit 13, which is a so-called push-pull system. The power supply unit 13 shown in FIG. 9 shows a state in which two power supply circuits 15 are provided side by side. .

As shown in FIG. 9, the power supply unit 13
Is provided with a center tap on the primary winding 5 and a DC power supply 19
Of the primary winding 5 are connected to switching elements (transistors in FIG. 9) 20, 2
1 and the emitters of the transistors 20 and 21 are connected to the ground side of the DC power supply 19.

The output of the oscillation circuit 16 shown in FIG. 9 is connected to the input of the flip-flop 22, while the flip-flop 22 has its output terminals Q ₁ , Q ₂ (Q
₁ and Q ₂ are output terminals having opposite phases) to the bases of the transistors 20 and 21 respectively.
The power supply unit 13 is configured.

The DC power supply 19 in the power supply unit 13 is a power supply obtained by rectifying and smoothing the AC power supply 17 shown in FIG. 8, and when the DC power supply 19 is connected to the power supply unit 13, the oscillation circuit 16 Is output to the bases of the transistors 20 and 21 via the flip-flop 22, and a high-frequency alternating current can flow through the primary winding 5.

The oscillation circuit 16 includes a flip-flop 2
2 and further connected to a plurality of power supply circuits 15 (two in FIG. 9), so that each of the power supply circuits 15 is driven synchronously, and the primary circuit connected to each of the power supply circuits 15 is connected. A current also flows through the winding 5 in synchronization.

As a result, the magnetic flux induced in each of the power supply heads 15 is also synchronized, and the magnetic flux in the portion where the plurality of power supply heads 13 are adjacent to each other has the same frequency and the same phase for each of the power supply heads 13. The magnetic flux induced by the feeding head 1 is linked to the receiving head 2 through the gap without canceling each other, and a current flows through the secondary winding 6.

Since the power receiving unit 14 connected to the power receiving head 2 has a resonance circuit formed by a resonance capacitor, the impedance decreases at the resonance frequency, and a current having the same frequency as the resonance frequency is supplied to the load 18. The flow and the load 18 can be operated well.

As described above, when a plurality of power supply heads 1 are provided in parallel, the power supply unit 13 is provided to synchronize the magnetic flux induced in the power supply heads 1 so that the power reception heads 2 face the power supply heads 1. Even when moving, the magnetic flux can be satisfactorily linked to the power receiving head 2, and the load 18 connected to the power receiving side can be reliably operated.

In the above-described embodiment, an example has been described in which the vertical cross-sectional shape of the main body portions 3a and 4a of the primary core 3 and the secondary core 4 of the contactless power feeding device is C-shaped. However, the present invention is not limited to this, and as long as a magnetic flux can be linked from the primary side to the secondary side, it goes without saying that a core having any shape may be used.

As for the shape of the flux barrier 9, an example in which the longitudinal cross-sectional shape is formed in a C-shape and the insertion hole 10 is formed in the center in the longitudinal direction has been described.
Without being limited to this shape, as long as it is possible to reduce the leakage magnetic flux interlinking between the legs of the primary core 3, the shape and the installation location of the flux barrier 9 may be appropriately changed. is there.

Further, the circuit in the power supply unit 13 is not limited to the one shown in FIG. 9, and any circuit structure that can apply a high-frequency alternating current to the primary winding 5 can be used. Good.

As described above, the non-contact power feeding device of the present invention can perform a power feeding operation in a wide range. Therefore, even when the secondary side is moving with respect to the primary side of the coupling transformer, the above-described operation is possible. Power can be supplied from the primary side to the secondary side in a good contactless manner. For example, power can be supplied to a conveyor for transporting moving objects, which is very convenient.

Further, the non-contact power supply device of the present invention does not generate carbon powder at all, unlike the conventional case where power is supplied by contacting a power supply terminal with a power receiving brush. Not only is the working environment safe and sanitary, but also maintenance of the brushes worn by contact is not required, so that the working environment can be improved satisfactorily.

Further, the contactless power supply device of the present invention does not use an expensive litz wire or a high-frequency current source, and it is not necessary to wire the litz wire with high accuracy so as not to contact the secondary core. There is also an advantage that the economic burden can be reduced.

[0053]

According to the non-contact power supply device of the present invention, the power supply head is formed to be wide, and when a plurality of the power supply heads are provided, control can be performed so that the magnetic flux induced in the power supply heads is synchronized. The power supply operation can be continuously performed over a wide range. Even when the power receiving head is moving with respect to the power supply head, the power can be continuously supplied without interruption.
In addition, it can be conveniently supplied in a non-contact state, which is convenient.

Further, the non-contact power feeding device of the present invention includes a magnetic flux adjusting function element made of a non-magnetic metal between legs of the core, and a part of the primary side and the secondary side casing is non-conductive. By using a magnetic metal, leakage magnetic flux and the like can be reduced, the magnetic flux can be efficiently linked to the secondary side, and the power supply efficiency can be improved satisfactorily.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a power supply head and a power reception head constituting a non-contact power supply device of the present invention are arranged to face each other.

FIG. 2 is a front view of the power supply head.

FIG. 3 is a front view of the power receiving head.

FIG. 4 is a diagram showing a shape of a magnetic flux adjusting function element constituting the power supply head.

FIG. 5 is an explanatory diagram illustrating an implementation state of a non-contact power supply device of the present invention.

FIG. 6 is an explanatory diagram showing a situation in which an eddy current is generated by leakage magnetic flux.

FIG. 7 is an explanatory diagram showing a state of a magnetic flux flowing from the power supply head to the power receiving head.

FIG. 8 is a block diagram illustrating a connection state between a power supply unit and a power receiving unit.

FIG. 9 is a circuit diagram showing a circuit configuration of the power supply unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply head 2 Power receiving head 3 Primary core 4 Secondary core 3a, 4a Body part 3b, 4b Arm part 5 Primary winding 6 Secondary winding 9 Magnetic flux adjustment function element 10 Insertion hole 11, 12 Casing 13 Power supply unit 14 Power receiving unit 15 Power supply circuit 16 Oscillation circuit 17 AC power supply 18 Load 19 DC power supply 20, 21 Transistor 22 Flip-flop

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinji Isaji 1280 Kawanakajimachohara, Nagano City, Nagano Prefecture F-term (reference) in Nagano Aichi Electric Machinery Co., Ltd. 5H105 BB07 CC02 CC19 DD10

Claims (10)

[Claims] 1. A power supply device in which a predetermined gap is provided between a primary side and a secondary side of a coupling transformer so that electric power can be supplied in a non-contact manner by electromagnetic induction.
Non-contact, characterized in that the main body of the secondary core is formed in a C-shape, and the primary core is constituted by the main body formed in the C-shape and the arms extending outward from both ends of the legs of the main body. Power supply. 2. A power supply device in which a predetermined gap is provided between a primary side and a secondary side of a coupling transformer so that electric power can be supplied in a non-contact manner by electromagnetic induction.
Non-contact, characterized in that the main body of the secondary core is formed in a C-shape, and a secondary core is constituted by the main body formed in the C-shape and arms extending outward from both ends of the legs of the main body. Power supply. 3. The non-contact power supply device according to claim 1, wherein a power supply head including a primary core and a primary winding is provided on a primary side of the coupling transformer, and the power supply head includes a primary winding. A non-contact power supply device comprising a plurality of power supply circuits for supplying a high-frequency alternating current. 4. The non-contact power supply device according to claim 3, further comprising an oscillation circuit on the primary side of the coupling transformer for controlling the power supply circuit so that the alternating current flowing through the plurality of primary windings is synchronized. A non-contact power feeding device characterized by comprising. 5. The non-contact power feeding device according to claim 1, wherein a plurality of power receiving heads each including a secondary core and a secondary winding and a plurality of power receiving circuits are provided on a secondary side of the coupling transformer. Characteristic non-contact power supply device. 6. The non-contact power feeding device according to claim 1, wherein the power receiving head provided on the secondary side of the coupling transformer faces the plurality of power feeding heads provided on the primary side. The armature extending outward from both ends of the legs of the core is configured to move in parallel in the same direction, and one of the coupling transformers
A non-contact power supply device capable of continuously supplying power to a secondary side of a coupling transformer in a continuous range on a secondary side. 7. The non-contact power supply device according to claim 1, wherein a non-magnetic metal material is provided between legs of the primary core of the coupling transformer to reduce leakage magnetic flux linked between the legs by eddy current. A non-contact power supply device characterized in that a leakage magnetic flux adjusting function element is inserted. 8. The non-contact power supply device according to claim 7, wherein the magnetic flux adjusting function element has a thickness set to 1 mm or more. 9. The contactless power supply device according to claim 1, wherein a power supply head provided on the primary side of the coupling transformer has a surface facing the secondary core and a plurality of power supply heads adjacent to each other. A non-contact power supply device comprising a casing formed of a non-magnetic metal other than the surface. 10. The non-contact power feeding device according to claim 1, wherein the power receiving head provided on the secondary side of the coupling transformer has an end face of an arm extending outward from both ends of the leg of the secondary core. A non-contact power supply device comprising a casing formed of a non-magnetic metal other than a surface facing the primary core.