KR102675983B1 - Wireless power transmission apparatus - Google Patents

Abstract

The present invention detects a charging module including first, second, and third transmission coils that transmit wireless power to a wireless power receiving device located on the charging pad, and a foreign object located on the charging pad. and a foreign matter detection module, wherein the foreign matter detection module includes a first detection coil portion disposed at the first center of the first transmission coil and the second transmission coil, the third transmission coil, and the second transmission coil. When transmitting the wireless power and the second sensing coil portion disposed at the second center, the foreign material position signal that detects the location of the foreign material is charged based on the organic voltages induced by each of the first and second sensing coil portions. A wireless power transmission device including a foreign matter detection unit that outputs output to a module is provided.

Description

{Wireless power transmission apparatus}

The present invention relates to a wireless power transmission device that can easily detect foreign objects.

Wireless power transmission (or wireless energy transfer), which uses the principle of magnetic field induction, is a technology that wirelessly transmits electrical energy from a transmitter to a receiver.

Wireless power transmission technology began using electric motors and transformers using the principle of electromagnetic induction as early as the 1800s, and since then, methods of transmitting electrical energy by radiating electromagnetic waves such as high frequency, microwave, and laser have also been attempted.

The electric toothbrushes and some cordless razors that we commonly use are actually charged using the principle of electromagnetic induction.

To date, energy transfer methods using wireless can be largely divided into magnetic induction, electromagnetic resonance, and RF transmission using short-wavelength radio frequencies.

Wireless power transmission technology can be used in a variety of industries, including not only mobile but also IT, railway, and home appliance industries.

If a conductor other than a wireless power receiver - that is, a foreign object (FO) - exists in the wireless charging area, the electromagnetic signal transmitted from the wireless power transmitter may be induced in the foreign object (FO), causing the temperature to rise. As an example, foreign matter (FO) may include coins, clips, pins, ballpoint pens, etc.

If a foreign object (FO) exists between the wireless power receiver and the wireless power transmitter, not only will the wireless charging efficiency be significantly reduced, but the temperature of the wireless power receiver and wireless power transmitter will also increase due to the temperature increase around the foreign object (FO). You can. If foreign matter (FO) located in the charging area is not removed, not only may power be wasted, but it may also cause damage to the wireless power transmitter and wireless power receiver due to overheating.

US Patent Publication No. 2015-0276965 (published on October 1, 2015), which is a prior art, discloses a metal foreign matter detection system for an inductive transmission system.

1 is a diagram showing a coil of a detection system according to a foreign matter detection system according to the prior art.

Referring to FIG. 1, each of the coils (LA, LB) of the detection system has one coil arranged in a zigzag pattern, and the coils (LA, LB) of the detection system may be arranged to cross each other.

At this time, when a foreign substance (FO) is placed, the coils (LA, LB) of the detection system become inductance. Here, the detection system connected to both ends of the coils (LA, LB) of the detection system can detect foreign matter (FO) according to the amount of change in inductance. However, although the prior art can detect foreign matter (FO), it is difficult to detect the location of the foreign matter (FO).

Recently, accurately detecting the location of foreign objects (FO) has emerged as an important issue in the field of wireless charging technology, and research is in progress.

The purpose of the present invention is to provide a wireless power transmission device that detects the location of a foreign object.

Additionally, the purpose of the present invention is to provide a wireless power transmission device that detects the location of a foreign substance using an induced voltage derived from wireless power transmitted from a transmission coil.

Additionally, the purpose of the present invention is to provide a wireless power transmission device that detects the location of a foreign substance by applying wiring differently depending on the number of sensing coils.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention that are not mentioned can be understood by the following description and will be more clearly understood by the examples of the present invention. Additionally, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof indicated in the patent claims.

The wireless power transmission device according to the present invention generates organic voltages induced in the first and second sensing coil parts by wireless power sequentially transmitted to the first and third transmission coils among the first to third transmission coils. Based on this, the location of foreign substances can be detected.

In addition, the wireless power transmission device according to the present invention can detect the location of a foreign substance by arranging at least two of the plurality of sensing coils included in each of the first and second sensing coil units to cross each other.

In addition, in the wireless power transmission device according to the present invention, the first and second sensing coil parts are arranged symmetrically to each other, so that power is not lost between the first and second sensing coil parts.

The wireless power transmission device according to the present invention transmits wireless power to a transmission coil to detect the position of a foreign substance on the charging pad, thereby reducing manufacturing costs and reducing circuit power by not using a separate power source when detecting the position of a foreign substance. It has the advantage of being simple to configure.

In addition, the wireless power transmission device according to the present invention has the advantage of minimizing the number of sensing coils and applying wiring differently depending on the number of sensing coils, making it easy to detect the location of foreign substances.

Additionally, the wireless power transmitting device according to the present invention has the advantage of being able to detect the location of foreign substances while transmitting wireless power to the wireless power receiving device located on the charging pad.

In addition, the wireless power transmission device according to the present invention blocks the driving power supplied to the transmitting coil where the foreign material is located when detecting the position of the foreign material and emits LED light corresponding to the transmitting coil, thereby preventing ignition by the foreign material during charging. There are benefits to doing this.

In addition to the above-described effects, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

1 is a diagram showing a coil of a detection system according to a foreign matter detection system according to the prior art.
Figure 2 is a control block diagram showing the control configuration of the wireless power transmission device according to the present invention.
FIG. 3 is a structural diagram showing the arrangement of the transmission coil shown in FIG. 2.
Figures 4 and 5 are structural diagrams showing various embodiments of the arrangement structure of the sensing coil shown in Figure 2.
Figure 6 is an operation diagram for explaining the operation of the wireless power transmission device according to the present invention.

The above-described objects, features, and advantages will be described in detail later with reference to the attached drawings, so that those skilled in the art will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. In the drawings, identical reference numerals are used to indicate identical or similar components.

Below, a wireless power transmission device according to an embodiment will be described.

Figure 2 is a control block diagram showing the control configuration of the wireless power transmission device according to the present invention.

Referring to FIG. 2, the wireless power transmission device may include a charging module 110 and a foreign matter detection module 150.

The charging module 110 may include a rectifier circuit 122, an inverter 124, and a transmitter 126.

First, the rectifier circuit unit 122 may rectify AC input power (Vin) input from an external power source (not shown) into direct current power (Vdc). At this time, the rectifier circuit unit 122 may include at least one diode. For example, the rectifier circuit unit 122 may be implemented as one of a half-wave rectifier circuit, a full-wave rectifier circuit, a bridge full-wave rectifier circuit, and a power factor correction (PFC) circuit.

In an embodiment, the rectifier circuit unit 122 may not be used when direct current input power (Vin) is input.

The inverter unit 124 may convert direct current power (Vdc) into alternating current (AC) type driving power (Vac). That is, the inverter unit 124 may include at least one switching element. Additionally, the at least one switching element may repeatedly perform turn-on and turn-off operations according to a predetermined driving frequency. For example, the at least one switching device may include an IGBT device or a FET device.

When driving power (Vac) is input, the transmitter 126 may transmit wireless power (Fo) to the wireless power receiver 130 disposed on the charging pad.

To transmit wireless power Fo, the transmitter 126 may include first to third transmission coils L1, L2, and L3 and first to third capacitors C1, C2, and C3.

At this time, each of the first to third transmission coils (L1, L2, L3) and the first to third capacitors (C1, C2, C3) may be implemented as one of a series resonance circuit, a parallel resonance circuit, and a series-parallel resonance circuit. there is.

Here, the first to third transmission coils (L1, L2, L3) each transmit wireless power (Fo) defined by alternating current power (Vac) and the capacitance of the first to third capacitors (C1, C2, C3). do.

The foreign matter detection module 150 may include first and second detection coil units 160 and 170 and a foreign matter detection unit 180.

The first sensing coil unit 160 is disposed at the first center of the first transmitting coil (L1) and the second transmitting coil (L2), and the second sensing coil portion 170 is located at the third transmitting coil (L3) and the second transmitting coil (L2). 2 It may be placed at the second center of the transmitting coil (L2).

The foreign matter detection unit 180 detects the location of the foreign matter located on the charging pad based on the induced voltages induced by each of the first and second sensing coil units 160 and 170, and charges the foreign matter detection signal S1. It can be transmitted to module 110.

Here, foreign substances containing magnetic materials may vary the inductance values of each of the first and second sensing coil units 160 and 170.

At this time, the foreign matter detection unit 180 can detect the location of the foreign matter by receiving the organic voltages induced in each of the first and second sensing coil units 160 and 170 and calculating the amount of change.

At this time, the charging module 110 confirms the location of the foreign material according to the foreign material detection signal S1, and at least one transmitting coil among the first to third transmitting coils L1, L2, and L3 corresponding to the location of the foreign material. The driving power (Vac) supplied to can be blocked.

The foreign matter detection module 150 according to the embodiment will be described in detail in FIG. 4 described later.

FIG. 3 is a structural diagram showing the arrangement of the transmission coil shown in FIG. 2.

Figure 3(a) shows first to third transmission coils (L1, L2, L3) wound in a circular shape, and Figure 3(b) shows first to third transmission coils (L1, L2, L3) wound in a square shape. ).

Referring to FIGS. 3(a) and 3(b), the second transmission coil (L2) may be disposed to overlap the first transmission coil (L1) and the third transmission coil (L3).

That is, the first area a1 of the second transmission coil L2 overlaps the first transmission coil L1, and the second area part a2 of the second transmission coil L2 overlaps the third transmission coil (L2). May overlap with L3).

The arrangement structure of the transmitting coil shown in FIG. 3 is only an example and is not limited thereto.

Figures 4 and 5 are structural diagrams showing various embodiments of the arrangement structure of the sensing coil shown in Figure 2.

Referring to FIG. 4, the first sensing coil unit 160 may include first to third sensing coils 162, 164, and 166.

First, one side of the first to third sensing coils 162, 164, and 166 is commonly connected to ground (G). Additionally, the other side of the first to third detection coils 162, 164, and 166 may be connected to the foreign matter detection unit 180.

The first transmission coil (L1) can be divided into first divided areas in the direction of the central vertical axis, that is, from the top to the bottom. The first divided areas represent areas where foreign substances are detected by the first to third detection coils 162, 164, and 166, and correspond to the detection areas of the first to third detection coils 162, 164, and 166. It could be an area.

At this time, the first to third sensing coils 162, 164, and 166 may be disposed in the first divided areas.

That is, the first sensing coil 162 is disposed in the first and fifth areas among the first divided areas. At this time, the first sensing coil 162 may generate a first induced voltage (Vref1) induced by the wireless power (Fo) transmitted from the first transmitting coil (L1).

The second sensing coil 164 is disposed in the second and fourth areas of the first divided areas. Here, the second sensing coil 164 may generate a second induced voltage (Vref2) induced by the wireless power (Fo) transmitted from the first transmitting coil (L1).

The third sensing coil 166 is disposed in the third area of the first divided areas. Here, the third sensing coil 166 may generate a third induced voltage (Vref3) induced by the wireless power (Fo) transmitted from the first transmitting coil (L1).

The second sensing coil unit 170 may include first to third sensing coils 172, 174, and 176.

First, one side of the fourth to sixth sensing coils 172, 174, and 176 is commonly connected to ground (G). Additionally, the other side of the fourth to sixth sensing coils 172, 174, and 176 may be connected to the foreign matter detection unit 180.

Additionally, the third transmission coil L3 can be divided into second divided areas in the direction of the central vertical axis, that is, from the top to the bottom.

At this time, the fourth to sixth sensing coils 172, 174, and 176 may be disposed in the second divided areas.

That is, the fourth sensing coil 172 is disposed in the 6th and 10th areas of the second divided areas. At this time, the fourth sensing coil 172 may generate a fourth induced voltage (Vref4) induced by the wireless power (Fo) transmitted from the third transmission coil (L3).

The fifth sensing coil 174 is disposed in the 7th and 9th areas of the second divided areas. Here, the fifth sensing coil 174 may generate a fifth induced voltage (Vref5) induced by the wireless power (Fo) transmitted from the third transmission coil (L3).

The sixth sensing coil 176 is disposed in the eighth region among the second divided regions. Here, the sixth sensing coil 176 may generate a sixth induced voltage (Vref6) induced by the wireless power (Fo) transmitted from the third transmission coil (L3).

Here, the first and second sensing coils 162 and 164 and the fourth and fifth sensing coils 172 and 174 may be arranged to cross each other.

That is, the first and second sensing coils 162 and 164 and the third and fourth sensing coils 172 and 174 respectively face each other with respect to the third and sixth sensing coils 166 and 164. First and second induced voltages (Vref1, Vref2) and third and fourth induced voltages (Vref3, Vref4) that detect foreign substances located in the sixth region and the seventh and tenth regions may be generated.

In addition, the third and sixth detection coils 166 and 176 each detect foreign substances located in the center of the first and third transmission coils L1 and L3, that is, the third and eighth regions. Induced voltages (Vref3, Vref6) can be generated.

Referring to FIG. 5, the first sensing coil unit 160 may include first to third sensing coils 162, 164, and 166.

First, one side of the first to third sensing coils 162, 164, and 166 is commonly connected to ground (G). Additionally, the other side of the first to third detection coils 162, 164, and 166 may be connected to the foreign matter detection unit 180.

The first transmission coil (L1) can be divided into first divided areas in the direction of the central vertical axis, that is, from the top to the bottom. The first divided areas represent areas where foreign substances are detected by the first to third detection coils 162, 164, and 166, and correspond to the detection areas of the first to third detection coils 162, 164, and 166. It could be an area.

At this time, the first to third sensing coils 162, 164, and 166 may be disposed in the first divided areas.

That is, the first sensing coil 162 is disposed in the first and sixth areas among the first divided areas. At this time, the first sensing coil 162 may generate a first induced voltage (Vref1) induced by the wireless power (Fo) transmitted from the first transmitting coil (L1).

The second sensing coil 164 is disposed in the second and fourth areas of the first divided areas. Here, the second sensing coil 164 may generate a second induced voltage (Vref2) induced by the wireless power (Fo) transmitted from the first transmitting coil (L1).

The third sensing coil 166 is disposed in the third and fifth areas of the first divided areas. Here, the third sensing coil 166 may generate a third induced voltage (Vref3) induced by the wireless power (Fo) transmitted from the first transmitting coil (L1).

The second sensing coil unit 170 may include first to third sensing coils 172, 174, and 176.

First, one side of the fourth to sixth sensing coils 172, 174, and 176 is commonly connected to ground (G). Additionally, the other side of the fourth to sixth sensing coils 172, 174, and 176 may be connected to the foreign matter detection unit 180.

Additionally, the third transmission coil L3 can be divided into second divided areas in the direction of the central vertical axis, that is, from the top to the bottom.

At this time, the fourth to sixth sensing coils 172, 174, and 176 may be disposed in the second divided areas.

That is, the fourth sensing coil 172 is disposed in the 7th and 12th areas among the second divided areas. At this time, the fourth sensing coil 172 may generate a fourth induced voltage (Vref4) induced by the wireless power (Fo) transmitted from the third transmission coil (L3).

The fifth sensing coil 174 is disposed in the 8th and 10th areas of the second divided areas. Here, the fifth sensing coil 174 may generate a fifth induced voltage (Vref5) induced by the wireless power (Fo) transmitted from the third transmission coil (L3).

The sixth sensing coil 176 is disposed in the 9th and 11th areas among the second divided areas. Here, the sixth sensing coil 176 may generate a sixth induced voltage (Vref6) induced by the wireless power (Fo) transmitted from the third transmission coil (L3).

Here, the second and third sensing coils 164 and 166 and the fifth and sixth sensing coils 174 and 176 may be arranged to cross each other.

Figure 6 is an operation diagram for explaining the operation of the wireless power transmission device according to the present invention.

First, before explaining FIG. 6, the operation of the charging module 110 and the foreign matter detection module 180 will be explained first.

The charging module 110 may supply driving power (Vac) to the first transmission coil (L1). At this time, the first transmission coil L1 may transmit wireless power Fo onto the charging pad.

The foreign matter detection module 180 may include a multiplexer 182 and a detection unit 184.

When the charging module 110 supplies the driving power (Vac) to the first transmission coil (L1), the multiplexer 182 is connected to the first to third divided regions of the first transmission coil (L1). Sensing coils 162, 164, and 166 can be connected sequentially.

According to the operation of the multiplexer 182, the sensing unit 184 detects the first to third induced voltages (Vref1, Vref2) induced by the wireless power (Fo) in the first to third sensing coils (162, 164, and 166). , Vref3) can be input sequentially.

The detection unit 184 may determine whether each of the first to third induced voltages Vref1, Vref2, and Vref3 falls within a set reference voltage range.

When each of the first to third induced voltages Vref1, Vref2, and Vref3 falls within the set reference voltage range, the detection unit 184 informs the charging module 110 that the foreign substance Fo is not detected.

Thereafter, the charging module 110 may supply driving power (Vac) to the third transmission coil (L3). At this time, the third transmission coil L3 may transmit wireless power Fo onto the charging pad.

When the charging module 110 supplies the driving power (Vac) to the third transmission coil (L3), the multiplexer 182 is connected to the fourth to sixth divisions disposed in the second divisions of the third transmission coil (L3). Sensing coils 172, 174, and 176 can be connected sequentially.

According to the operation of the multiplexer 182, the detection unit 184 detects the fourth to sixth induced voltages (Vref4, Vref5, Vref6) can be input sequentially.

The detection unit 184 may determine whether each of the fourth to sixth induced voltages Vref4, Vref5, and Vref6 falls within the reference voltage range.

When each of the fourth to sixth induced voltages Vref4, Vref5, and Vref6 falls within the reference voltage range, the detection unit 184 reports to the charging module 110 that the foreign substance Fo is not detected.

Referring to FIG. 6, the operation of detecting the location of the foreign substance Fo will be described.

As described above, when the driving power (Vac) is supplied, the first transmission coil (L1) transmits wireless power (Fo).

At this time, the multiplexer 182 connects the first sensing coil 162 and the sensing unit 184. The sensing unit 184 receives the first induced voltage (Vref1) induced by the first sensing coil 162.

The detection unit 184 determines whether the first induced voltage Vref1 falls within the set reference voltage range. If the first induced voltage (Vref1) falls within the reference voltage range, the sensing unit 184 detects a foreign substance (Fo) in the first and fifth regions where the first sensing coil 162 is disposed among the first divided regions. Confirm that is not located.

Afterwards, the multiplexer 182 blocks the connection between the first detection coil 162 and the detection unit 184 and connects the second detection coil 162 and the detection unit 184.

The sensing unit 184 receives the second induced voltage Vref2 induced by the second sensing coil 164. The detection unit 184 determines whether the second induced voltage Vref2 falls within the reference voltage range.

If the second induced voltage (Vref2) does not fall within the reference voltage range, the sensing unit 184 detects a foreign substance (Fo) in the second and fourth regions where the second sensing coil 164 is disposed among the first divided regions. Confirm that is located.

When it is confirmed that the foreign matter Fo is located in the second and fourth areas, the detection unit 184 outputs a foreign matter position signal S1 corresponding to the location of the foreign matter Fo to the charging module 110.

Afterwards, the multiplexer 182 blocks the connection between the second detection coil 164 and the detection unit 184 and connects the third detection coil 166 and the detection unit 184.

The sensing unit 184 receives the third induced voltage Vref3 induced by the third sensing coil 166. The detection unit 184 determines whether the third induced voltage Vref3 falls within the reference voltage range.

If the third induced voltage Vref3 does not fall within the reference voltage range, the sensing unit 184 determines that the foreign matter Fo is located in the third region where the third sensing coil 166 is disposed among the first divided regions. Confirm.

When it is confirmed that the foreign matter Fo is located in the third area, the detection unit 184 outputs a foreign matter position signal S1 corresponding to the position of the foreign matter Fo to the charging module 110.

That is, as shown in FIG. 6, when a foreign substance Fo is disposed between the second and third sensing coils 164 and 166, the sensing unit 184 detects the first to third induced voltages Vref1, Vref2, and Vref3. After sequentially determining whether it falls within the reference voltage range, a foreign matter location signal (S1) can be output to the charging module 110.

When the foreign matter position signal S1 output from the detection unit 184 is input, the charging module 110 is confirmed to be located between the second and third detection coils 164 and 166. Then, the charging module 110 blocks the driving power (Vac) supplied to the first transmission coil (L1).

Additionally, the charging module 110 may emit LED light corresponding to the first transmission coil L1.

In the same way as the method for detecting the position of a foreign substance (Fo) on the first transmission coil (L1) described above, it is possible to detect whether a foreign substance (Fo) is located on the third transmission coil (L3), and the description is omitted. Do this.

The above-described present invention may be subject to various substitutions, modifications, and changes without departing from the technical spirit of the present invention to those skilled in the art to which the present invention pertains. It is not limited by .

Claims (9)

A charging module including a first transmission coil, a second transmission coil, and a third transmission coil that transmits wireless power to a wireless power receiving device located on the charging pad; and
It includes a foreign object detection module that detects a foreign object located on the charging pad,
The foreign matter detection module is,
a first sensing coil portion disposed at a first center of the first transmission coil and the second transmission coil;
a second sensing coil portion disposed at a second center of the third transmission coil and the second transmission coil; and
When transmitting the wireless power, a foreign substance is located in the sensing coil that generates an organic voltage that does not fall within the reference voltage range among the organic voltages generated by the plurality of sensing coils of each of the first sensing coil portion and the second sensing coil portion. It includes a foreign matter detection unit that determines that the foreign matter is located and outputs a foreign matter position signal regarding the position of the foreign matter to the charging module,
The first sensing coil unit,
A first sensing coil disposed in a first region and a fifth region among first divided regions oriented along the central vertical axis of the first transmission coil, and generating a first induced voltage induced by the transmission of the wireless power. ;
a second sensing coil disposed in the second and fourth areas of the first divided areas and generating a second induced voltage induced by the transmission of the wireless power; and
It is disposed in a third area of the first divided areas and includes a third sensing coil that generates a third induced voltage induced by the transmission of the wireless power,
The second sensing coil unit,
A fourth sensing coil disposed in the sixth and tenth regions of the second divided regions oriented along the central vertical axis of the second transmission coil and generating a fourth induced voltage induced by the transmission of the wireless power. ;
a fifth sensing coil disposed in the seventh and ninth regions of the second divided regions and generating a fifth induced voltage induced by the transmission of the wireless power; and
A sixth sensing coil disposed in an eighth region of the second divided regions and generating a sixth induced voltage induced by transmission of the wireless power,
Wireless power transmission device.
According to claim 1,
The first sensing coil portion and the second sensing coil portion,
Arranged symmetrically with respect to the central axis between the first center and the second center,
Wireless power transmission device.
delete According to claim 1,
The foreign matter detection unit,
A multiplexer sequentially connected to each of the first to sixth sensing coils; and
Determine the location of the foreign substance by determining whether each of the first to sixth induced voltages generated by each of the first to sixth sensing coils sequentially connected in the multiplexer falls within a set reference voltage range; , including a detection unit that outputs the foreign matter location signal,
Wireless power transmission device.
According to claim 4,
The sensing unit,
If at least one of the first to sixth induced voltages does not fall within the reference voltage range, at least one of the first to sixth sensing coils that generates the at least one induced voltage detecting that the foreign matter is located in the sensing coil, and outputting the foreign material position signal corresponding to at least one area in which the at least one sensing coil is disposed among the first to tenth areas,
Wireless power transmission device.
According to claim 1,
The charging module is,
Transmitting the wireless power by sequentially supplying driving power to the first transmission coil and the third transmission coil to check the location of the foreign matter,
Wireless power transmission device.
According to claim 6,
The charging module is,
When the foreign matter location signal is input, the supply of the driving power to at least one of the first to third transmission coils is blocked,
Wireless power transmission device.
According to claim 7,
The charging module is,
When supply of the driving power is cut off, emitting LED light corresponding to the at least one transmission coil,
Wireless power transmission device.
A charging module including a first transmission coil, a second transmission coil, and a third transmission coil that transmits wireless power to a wireless power receiving device located on the charging pad; and
It includes a foreign object detection module that detects a foreign object located on the charging pad,
The foreign matter detection module is,
a first sensing coil portion disposed at a first center of the first transmission coil and the second transmission coil;
a second sensing coil portion disposed at a second center of the third transmission coil and the second transmission coil; and
When transmitting the wireless power, a foreign substance is located in the sensing coil that generates an organic voltage that does not fall within the reference voltage range among the organic voltages generated by the plurality of sensing coils of each of the first sensing coil portion and the second sensing coil portion. It includes a foreign matter detection unit that determines that the foreign matter is located and outputs a foreign matter position signal regarding the position of the foreign matter to the charging module,
The first sensing coil unit,
A first sensing coil disposed in a first region and a sixth region among first divided regions oriented along the central vertical axis of the first transmission coil, and generating a first induced voltage induced by the transmission of the wireless power. ;
a second sensing coil disposed in the second and fourth areas of the first divided areas and generating a second induced voltage induced by the transmission of the wireless power; and
It is disposed in a third area and a fifth area of the first divided areas, and includes a third sensing coil that generates a third induced voltage induced by the transmission of the wireless power,
The second sensing coil unit,
A fourth sensing coil disposed in the seventh and twelfth regions of the second divided regions oriented in the direction of the central vertical axis of the second transmission coil and generating a fourth induced voltage induced by the transmission of the wireless power. ;
a fifth sensing coil disposed in the eighth and tenth regions of the second divided regions and generating a fifth induced voltage induced by the transmission of the wireless power; and
A sixth sensing coil disposed in the ninth and eleventh regions of the second divided regions and generating a sixth induced voltage induced by the transmission of the wireless power,
Wireless power transmission device.

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