KR101325549B1 - wireless power transfer apparatus having magnetic field shielding function using transformer - Google Patents

wireless power transfer apparatus having magnetic field shielding function using transformer Download PDF

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Publication number
KR101325549B1
KR101325549B1 KR1020110139658A KR20110139658A KR101325549B1 KR 101325549 B1 KR101325549 B1 KR 101325549B1 KR 1020110139658 A KR1020110139658 A KR 1020110139658A KR 20110139658 A KR20110139658 A KR 20110139658A KR 101325549 B1 KR101325549 B1 KR 101325549B1
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KR
South Korea
Prior art keywords
coil
current collector
current
magnetic field
offset
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KR1020110139658A
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Korean (ko)
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KR20130072284A (en
Inventor
조정구
민병덕
문용기
송두익
손호섭
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(주)그린파워
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Priority to KR1020110139658A priority Critical patent/KR101325549B1/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
    • H02J50/70Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00Variable transformers or inductances not covered by group H01F21/00
    • H01F29/08Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators
    • H01F29/12Variable transformers or inductances not covered by group H01F21/00 with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators having movable coil, winding, or part thereof; having movable shield
    • 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
    • H01F38/20Instruments transformers
    • H01F38/22Instruments transformers for single phase ac
    • H01F38/28Current transformers
    • 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

Abstract

Wireless power transmission device having a device capable of adjusting the electromagnetic shielding strength according to the present invention shields the magnetic field (EMF) generated between the feed coil and the current collector coil to block the harmful effects on the human body. In order to solve this problem, the present invention is disposed at a distance from the current collector coil at a predetermined distance from the outside of the current collector coil, and extends one end of the current collector coil to wind in a direction opposite to the current collector coil to form a magnetic field in a reverse direction outside the current collector coil. By offsetting the magnetic field outside the current collector coil, by installing a current transformer may apply a current to the offset coil or change the applied current.

Description

Wireless power transfer apparatus with current transformer-based electromagnetic shielding device {wireless power transfer apparatus having magnetic field shielding function using transformer}

A wireless power transmission device that transmits power by magnetic induction has a problem in that a magnetic field (EMF) generated between a feed coil and a current collector coil is emitted to the outside and affects the human body. The present invention relates to a method of attenuating the above magnetic field (EMF) to solve this problem.

The present invention relates to a wireless power transmission apparatus for wirelessly transferring electric power by magnetic induction to an electric railway vehicle moving along a predetermined track or an electric vehicle parked and stopped at a designated place.

In the case of existing railroad cars, monorail cars, and trolley buses moving along a defined track, mechanical or electrical means are used to provide the energy required for the propulsion of the vehicle. Existing electric railroads are energized by means of contact through the upper wires, damaging the aesthetics of the city, and causing an accident such as electric shocks due to maintenance and exposure of roads on high-voltage lines. In the case of an electric vehicle that stores and uses electricity in a battery instead of a general engine vehicle, a process of connecting a connector of a cable for supplying electric energy to the connector of the electric vehicle is very troublesome. In order to solve the power supply problem of the railway vehicle and the charging of the electric vehicle, electric power is wirelessly transmitted by using magnetic induction to an electric railway vehicle moving along a predetermined track or an electric vehicle parked or stopped at a designated place without making electrical contact. There is a growing interest in wireless power transmission schemes.

However, the wireless power transmission device has a problem in that a magnetic field generated between the power supply coil and the current collector coil that receives power by magnetic induction leaks to the outside and thus has a harmful effect on the human body.

The present invention has been proposed in view of the above problems, and the present invention is provided with an apparatus capable of adjusting electromagnetic shielding strength that can offset the external outflow of the magnetic field generated between the power supply coil and the current collecting coil that receives electric power by magnetic induction. In one aspect, there is provided a wireless power transmission apparatus.

In order to achieve the above object, a wireless power transmission device having a device capable of adjusting electromagnetic shielding strength according to the present invention is buried in a road or installed on the floor of a fixed place by a high frequency alternating current by high frequency alternating current supplied from the outside. A wireless power transmission device having a device capable of adjusting electromagnetic field shielding strength, which receives electric power from a feeding coil that generates power, by magnetic induction, wherein the wireless power transmission device has a spatial distance from the feeding coil and is disposed in parallel with the feeding coil, A current collecting coil which receives electric power wirelessly from the feeding coil; An offset coil wound around the current collector coil at a predetermined number of turns at a predetermined distance from the current collector coil to form a magnetic field in a direction opposite to the direction of the magnetic field generated in the current collector coil to offset the magnetic field generated from the current collector coil; A current transformer wound around the current collector coil at a predetermined number of turns so as to be insulated from the current collector coil, to apply a current to the offset coil from the current collector coil, and to change a current flowing in the offset coil according to the number of turns wound on the current collector coil. do.
The current collector coil and a predetermined distance are disposed parallel to the feed coil having a spatial distance from the feed coil and the feed coil which generate a high frequency magnetic flux by a high frequency alternating current and receive electric power by magnetic induction. A magnetic field offset coil is disposed to be spaced apart from each other and extends one end of the current collector coil to a predetermined number of turns in a direction opposite to the current collector coil to form a reverse magnetic field outside the current collector coil to offset the magnetic field outside the current collector coil. It is configured by.

The offset coil of the present invention may be configured without a magnetic core, or may have a magnetic core on the coil upper surface.

In addition, the offset coil of the present invention is preferably wound different distances from the current collector coil in order to adjust the magnetic field shielding strength in the front and rear (Y axis), left and right (X axis) direction of the current collector coil.

When the current flowing through the offset coil of the present invention requires an arbitrary current that is not an integer multiple of the current flowing through the current collector coil, the offset coil is configured through a separate transformer at one end of the current collector coil instead of using the current collector to extend the current collector. It is desirable to.

Wireless power transmission apparatus having a device capable of adjusting the electromagnetic shielding strength according to the present invention, has an effect of preventing the external leakage of the magnetic field generated between the power supply coil and the current collector coil receives the power when the power is delivered by magnetic induction have.

1 is a general configuration of a wireless power transmission device,
2 is an electromagnetic shielding configuration using the lower shielding plate,
3 is an electromagnetic shielding configuration using the side shield plate,
4 is a configuration diagram of an electromagnetic shielding device of the present invention;
5 is a configuration diagram to which the electromagnetic shielding device of the present invention is applied;
6 is a configuration diagram of the present invention applied to a circular coil winding,
7 is a configuration diagram of the present invention applied to a rectangular coil winding,
8 is a configuration diagram of the current transformer of the present invention applied to a circular coil winding;
9 is a configuration diagram of the current transformer of the present invention applied to a rectangular coil winding;
10 is a graph comparing the electromagnetic field strength before and after the application of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment not limiting the present invention.

1 shows a general configuration diagram of a wireless power transmission apparatus. The feed coil 3, which is embedded in the road or installed on the ground, is disposed in parallel with the feed coil, and includes a current collector coil 2 and a current collector core 1 that receive electric power by magnetic induction.
The high frequency magnetic flux generated by the high frequency current flowing through the feed coil 3 returns to the feed coil 3 via the current collector core 1, which is a magnetic body on the upper surface of the current collector coil. The magnetic flux of the feed coil 3 becomes weaker when it is moved away from the feed coil 3, but due to the current collector core 1 located on the top surface of the current coil 2, the magnetic flux of the feed coil 3 is separated from the current coil 2. The amount of exchange will increase. In other words, the current collector core 1 has the effect of increasing the magnetic flux coupling between the power supply coil 3 and the current collector coil 2, but also serves to widen the influence of the magnetic field by the magnetic flux.
As shown in FIG. 1, the magnetic flux shows the magnetic flux (F) distribution spreading on both sides of the feed coil and the collector coil. The spacing between the magnetic flux lines indicates the strength of the magnetic flux. If the magnetic flux is densely displayed, the magnetic flux density is high. In FIG. 1, it can be seen that the magnetic flux between the feed coil and the collector coil flows out to a wide range. Conventionally, the method of [FIG. 2] or [FIG. 3] was used to shield the leakage of the magnetic field generated between the feed coil and the collector coil.

2 is an electromagnetic shielding configuration diagram using a lower shield plate, and FIG. 3 is an electromagnetic shielding configuration diagram using a side shield plate.
In FIG. 2, a power supply coil 3 and a current collector are mounted on a lower portion of the electric vehicle 5 by mounting a shield plate 4 having a curved end in a downward direction in the form of a flat plate recessed upward by a predetermined width to the upper portion of the electric vehicle. The influence of the magnetic flux by the coil 2 was shielded.
In FIG. 2, the high-frequency magnetic flux of the feeding coil installed on the ground spreads laterally among the magnetic fluxes returning through the current-collecting coil returns to the curved end of the shielding plate facing downward of the shielding plate made of non-ferrous metal. Due to this leakage of magnetic flux is shielded, but there is a problem in that the lower portion of the electric vehicle (5) for application.
In FIG. 3, the shielding plate 4a is attached to the side of the electric vehicle to block the leakage of the magnetic field in the vicinity of the electric vehicle, in which the leakage of the magnetic field actually generated during wireless power transmission is a problem. When the side shield plate applied to [Fig. 3] is attached to the vehicle and operated, various problems occur during the operation, and there is a problem that a separate mechanism is required to enable the side shield plate to move up and down.


4 is a configuration diagram of the electromagnetic shielding device of the present invention, and FIG. 5 is a configuration diagram to which the electromagnetic shielding device of the present invention is applied.
Referring to FIGS. 4 and 5, the present invention is magnetically induced from a feed coil 3 that is embedded in a road or installed on the bottom surface of a predetermined place to generate high frequency magnetic flux by high frequency AC current supplied from the outside. It is a wireless power transmission device having a current collector coil (2) receiving power by. In particular, the offset coil 8 and the current transformer 14 are configured to cancel the magnetic field of the current collector coil 2.
The current collector coil 2 is disposed in parallel with the power supply coil 3 at a spatial distance from the power supply coil 3 and wirelessly receives power from the power supply coil 3 by magnetic induction.
The offset coil 8 is wound around the current collector coil 2 at a predetermined number of turns at a predetermined distance from the current collector coil 2 to form a magnetic field in a direction opposite to the direction of the magnetic field generated in the current collector coil 2. The magnetic field generated from the coil 2 is canceled out.
The current transformer 14 is wound at a predetermined number of turns on one end of the current collector coil 2 so as to be insulated from the current collector coil 2, and applies a current induced from the current collector coil 2 to the offset coil 8. The current transformer 14 applies a current in a direction opposite to the current collector coil 2 to the offset coil 8 so that the offset coil 8 forms a magnetic field in a direction opposite to the direction of the magnetic field generated in the current collector coil 2. It is composed.
Thus, the shielding structure as shown in Figs. 4 and 5 effectively shields the magnetic field leakage caused by the feed coil 3 and the current collector coil 2.
The high frequency magnetic flux caused by the high frequency current flowing through the feed coil 3 passes through the current collecting core 1 and returns to the feed coil 3 again, and the magnetic flux is bridged with the current collector coil 2 wound in a closed manner.
The structure of the offset coil 8 shown in FIGS. 4 and 5 is a predetermined distance d1 and d2 from the current collector coil 2 outside the current collector coil 2, as shown in FIG. Spaced apart and extending one end of the current collector coil (2) using the offset coil (8) wound in the opposite direction to the current collector coil (2) to form a magnetic field in the reverse direction to the outside of the current collector coil (2) (2) Offset the outer magnetic field.
As shown in FIG. 4, the electromagnetic shielding apparatus of the present invention has a current collector core 1 in a state in which a current collector core 1 having magnetic properties is stacked on an upper surface of the current collector core 1 and a magnetic current collector core 2 wound around the current collector coil 2. 1) an insulating pad 10 which is insulated from the outside and discharges heat generated from the current collector core 1 and the current collector coil 2 to the outside and a non-ferrous metal aluminum fixing plate laminated on the top surface of the insulating pad 10 (9). ) And an offset coil 8 disposed at a distance apart from the current collector coil 2 at a distance from the current collector coil 2.

In FIG. 4, the current direction of the offset coil 8 is opposite to the current direction of the current collector coil 2. As a result, a magnetic field in a direction opposite to that of the magnetic field collected by the current collector coil 2 is formed, and the middle of the current collector coil 2 and the offset coil 8 increases in magnetic flux density than before, but at a side away from the current collector coil 2. The magnetic flux density is rapidly attenuated.

5 shows a configuration diagram to which the shielding device of the present invention is applied. FIG. 5 illustrates a current collector core 1 having magnetic properties in a flat plate shape in which a current collector coil 2 is wound, and a current collector core 1 in a state of being stacked on an upper surface of the current collector core 1. And an insulating pad 10 that insulates the outside and the heat generated from the current collector core 1 and the current collector coil 2 to the outside.
In addition, in the present embodiment, the core 11 having a flat plate magnetic shape in which the offset coil 8 is wound, the insulating pad 10 and the current collector coil which insulate the core from the outside in a state of being laminated on the upper surface of the core ( An aluminum fixing plate 9 made of a non-ferrous metal material laminated on the upper surface of the insulating pad 10 of 2) and the insulating pad 10 of the offset coil 8 is provided.
In addition, in the present embodiment, the offset coil 8, the core 11, and the insulating pad 10 are disposed to be spaced apart from the current collector coil 2 by a predetermined distance, and the offset coil 8 and the core 11 sequentially stacked. ), A case in which the outer surface of the current collector coil 2, the current collector core 1, and the insulating pad 10 that are sequentially stacked with the insulating pad 10 is enclosed, and the edge is engaged with the bottom edge of the fixing plate. Not).

In FIG. 5, the current direction of the offset coil 8 is opposite to the current direction of the current collector coil 20. As a result, a magnetic field in a direction opposite to that of the magnetic field collected by the current collector coil 2 is formed, and the middle of the current collector coil 2 and the offset coil 8 increases in magnetic flux density than before, but at a side away from the current collector coil 2. It can be seen that the magnetic flux density is rapidly attenuated. In addition, in FIG. 5, magnetic flux leakage is concentrated by stacking a non-ferrous metal aluminum fixing plate to leak magnetic flux concentrated between the current collector coil 2 and the offset coil 8.

FIG. 6 is a configuration diagram applying the present invention to a circular coil winding and FIG. 7 to a square coil winding. 6 shows the arrangement of the offset coil 8 when the current collector coil 2 is wound in a circular shape.
The current direction 13a of the offset coil 8 extends one end of the current collector coil 2 so as to be reverse to the current direction 13b of the current collector coil 2, and is wound in a direction opposite to the winding direction of the current collector coil 2. do.
In order to adjust the shielding strength of the magnetic field in the front-rear (Y-axis) and left-right (X-axis) directions, the distance d1 and d2 of the outline of the current collector coil 2 and the offset coil 8 are adjusted and wound. Winding d1 wider than d2 increases the magnetic shielding strength in the left and right (X-axis) directions. On the contrary, winding d2 wider than d1 increases the magnetic shielding strength in the front-rear (Y-axis) direction.
This effect is the same in the rectangular coil winding structure of FIG. 7. The operation is as follows. Winding w1 wider than w2 results in an increase in magnetic field shielding strength in the left and right (X-axis) directions. On the contrary, winding w2 wider than w1 increases the magnetic shielding strength in the front-rear (Y-axis) direction.

8 is a configuration diagram of the current transformer of the present invention applied to a circular coil winding, and FIG. 9 is a diagram of the configuration of the current transformer of the present invention applied to a square coil winding. As shown in FIG. 6 and FIG. 7, the magnitude of the current flowing through the offset coil 8 is given by an integer multiple of the magnitude of the current of the current collector coil 2.
The offset coil 8, in which a current of any size flows, rather than an integer multiple of the current flowing in the current coil 2, is supplied to a separate current transformer 14 at one end of the current coil 2. ) Is configured.
As shown in FIGS. 8 and 9, a plurality of windings are wound in the form of a circular coil insulated at one end of the current collector coil 2 to the current flowing through the current collector coil 2 and the number of windings of the current transformer 14. The current determined by the current flows through the offset coil 8. The contents of the magnetic field shielding strength adjustment according to the arrangement of the offset coils 8 using the current transformer 14 are the same as those of FIGS. 6 and 7.

10 is a graph comparing electromagnetic field strengths before and after application of the present invention. The result of measuring the electromagnetic field of the wireless power transmitter with a measurement distance of 175cm is as follows.
In the absence of the offset coil 8, the rated height is 170 mG when the measured height is 30 cm (h1) and 141 mG when the 50 cm (h2) is used. In the absence of the offset coil 8, when the load increases, the strength of the magnetic field leaking between the feed coil and the collector coil 2 exceeds the EMF standard (62.5 mG).
In the case of the electromagnetic shielding device of the present invention, the measured height is 30 mG at 30 cm (h1) and 12 mG at 50 cm (h2) under the rated load conditions. The reverse magnetic field generated by the current flowing through 8) has the effect of shielding the magnetic fields by the feed coil 3 and the current collector coil 2.

1: current collector core 2: current collector coil
3: feed coil 4, 4a: shield plate
5: electric vehicle
8: offset coil 9: fixed plate
10: insulation pad 11: core
13a, 13b: current direction 14: current transformer
15 current collector 16 power supply unit
F: magnetic flux r, r1, r2: measuring distance
h1, h2: measuring height R: circular coil diameter
d1, d2, w1, w2, d1a, d2a, w1a, w2a: distance between current collector and offset coil

Claims (4)

  1. A wireless power transmission device having electric current shielding based on a current transformer and receiving electric power from a feeding coil 3 buried in a road or installed on a floor of a predetermined place to generate high frequency magnetic flux by magnetic induction,
    A current collecting coil (2) spaced apart from the feeding coil and arranged in parallel with the feeding coil and receiving power wirelessly from the feeding coil by magnetic induction;
    An offset coil wound around the current collector coil at a predetermined number of turns at a predetermined distance from the current collector coil to offset a magnetic field generated from the current collector coil by forming a magnetic field in a direction opposite to the direction of the magnetic field generated in the current collector coil ( 8);
    A current transformer 14 wound around one end of the current collector coil to be insulated from the current collector coil to induce current in a direction opposite to the current collector coil from the current collector coil and to apply the current to the offset coil;
    Wireless power transmission device having a current transformer-based electromagnetic shielding device configured to include.
  2. The method according to claim 1,
    The offset coil (8) is a wireless power transmission device having an electromagnetic shielding device based on the current transformer, characterized in that the winding on the lower surface of the core (11) having a magnetic plate shape.
  3. delete
  4. delete
KR1020110139658A 2011-12-22 2011-12-22 wireless power transfer apparatus having magnetic field shielding function using transformer KR101325549B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107210126A (en) * 2014-09-11 2017-09-26 奥克兰联合服务有限公司 The magnetic flux coupled structure offset with controlled magnetic flux

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US9431473B2 (en) 2012-11-21 2016-08-30 Qualcomm Incorporated Hybrid transformer structure on semiconductor devices
US10002700B2 (en) 2013-02-27 2018-06-19 Qualcomm Incorporated Vertical-coupling transformer with an air-gap structure
US9634645B2 (en) 2013-03-14 2017-04-25 Qualcomm Incorporated Integration of a replica circuit and a transformer above a dielectric substrate
US9449753B2 (en) 2013-08-30 2016-09-20 Qualcomm Incorporated Varying thickness inductor
US9906318B2 (en) 2014-04-18 2018-02-27 Qualcomm Incorporated Frequency multiplexer
US9889754B2 (en) 2014-09-09 2018-02-13 Qualcomm Incorporated System and method for reducing leakage flux in wireless electric vehicle charging systems
US9923406B2 (en) 2015-09-04 2018-03-20 Qualcomm Incorporated System and method for reducing leakage flux in wireless charging systems
KR20170126735A (en) * 2016-05-10 2017-11-20 삼성전자주식회사 Apparatus and method for transmitting a magnetic strip data
KR20170134018A (en) 2016-05-27 2017-12-06 삼성전자주식회사 Wireless power receiver and method thereof
KR20180002999A (en) * 2016-06-30 2018-01-09 엘지이노텍 주식회사 Wireless power transmission coil arranging method and the coil
KR101897489B1 (en) * 2016-12-30 2018-09-13 한국전기안전공사 Electromagnetic inductive effect avoidance cable

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KR101038759B1 (en) * 2009-12-21 2011-06-03 한국과학기술원 Collector device for electric vehicle with active cancellation of emf

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KR101038759B1 (en) * 2009-12-21 2011-06-03 한국과학기술원 Collector device for electric vehicle with active cancellation of emf

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107210126A (en) * 2014-09-11 2017-09-26 奥克兰联合服务有限公司 The magnetic flux coupled structure offset with controlled magnetic flux

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