KR20210013946A - Wireless power transfer apparatus and system including the same - Google Patents

Abstract

The present invention relates to a wireless power transmission apparatus and a wireless power transmission including the same. The wireless power transmission apparatus according to an embodiment of the present invention comprises: at least one transmission coil; a first shielding member disposed at one surface of the at least one transmission coil; and a second shielding member disposed at an opposite surface of the at least one transmission coil. The first shielding member includes: a first protrusion surface to surround an outer perimeter of the at least one transmission coil; and a second protrusion surface to surround an inner perimeter of the at least one transmission coil. The second shielding member makes contact with the second protrusion surface to cover a part of opposite surfaces of the at least one transmission coil. Therefore, the present invention can improve a quality factor of the wireless power transmission apparatus and improve power transmitting/receiving efficiency between wireless power transmission apparatuses. Various other embodiments are possible.

Description

Wireless power transmission device and wireless power system including the same TECHNICAL FIELD [WIRELESS POWER TRANSFER APPARATUS AND SYSTEM INCLUDING THE SAME}

The present invention relates to a wireless power transmission device and a wireless power system including the same, and more particularly, to a wireless power transmission device capable of improving the efficiency of power transmission, and a wireless power system including the same.

In general, when power is supplied to an electronic device, a terminal supply method of supplying commercial power by connecting a physical cable or wire to the electronic device is used. In such a terminal supply method, cables or wires occupy considerable space, are not easy to arrange, and there is a risk of disconnection.

In recent years, in order to solve this problem, research on a wireless power transmission method has been discussed.

The wireless power transmission system may include a wireless power transmission device that supplies power through a single coil or multiple coils, and a wireless power reception device that receives and uses power wirelessly supplied from the wireless power transmission device.

As a wireless power supply method, an inductive coupling method is mainly used, and this method changes the magnetic field by the current when the intensity of the current flowing through the primary coil among two adjacent coils is changed. , As a result, the magnetic flux passing through the secondary coil is changed, and an induced electromotive force is generated on the secondary coil side. That is, according to this method, when only the current of the primary coil is changed while the two coils are spaced apart without spatially moving the two conductors, induced electromotive force is generated.

On the other hand, in the case of wirelessly transmitting and receiving power through such a method, various methods for increasing charging efficiency in power transmission and reception have been proposed.

The present invention is to provide a wireless power transmission apparatus capable of improving transmission efficiency in wirelessly transmitting power and a system including the same.

In order to achieve the above object, a wireless power transmission device according to an embodiment of the present invention includes at least one transmitting coil, a first shielding member disposed on one surface of the at least one transmitting coil, and the other surface of the at least one transmitting coil. And a second shielding member disposed, wherein the first shielding member includes a first protruding surface formed to surround an outer circumference of at least one transmitting coil and a second formed to be surrounded by an inner circumference of at least one transmitting coil The second shielding member may include a protruding surface, and may be disposed so as to contact the second protruding surface and cover a portion of the other surface of the at least one transmitting coil.

In order to achieve the above object, the wireless power system according to an embodiment of the present invention includes at least one transmitting coil, a first shielding member disposed on one surface of the at least one transmitting coil, and a second surface of the at least one transmitting coil. And a second shielding member, wherein the first shielding member includes a first protruding surface formed to surround an outer circumference of at least one transmitting coil and a second protruding formed to be wrapped by an inner circumference of at least one transmitting coil Including a surface, the second shielding member may include an electroless power transmission device disposed to be in contact with the second protruding surface and to cover a portion of the other surface of the at least one transmission coil.

According to various embodiments of the present disclosure, a quality factor of a wireless power transmission device may be improved, and thus power transmission/reception efficiency between the wireless power transmission device and the wireless power reception device may be improved.

1 is a block diagram illustrating a wireless power system according to an embodiment of the present invention.
2 is an internal block diagram of an apparatus for transmitting power wirelessly according to an embodiment of the present invention.
3 is an internal block diagram of an apparatus for receiving wireless power according to an embodiment of the present invention.
Figure 4a is an exploded perspective view of a power transmission unit according to an embodiment of the present invention, Figure 4b is a perspective view of the power transmission unit according to an embodiment of the present invention, and Figure 4c is, according to an embodiment of the present invention, It is a cross-sectional view of the power transmission unit.
5A is an exploded perspective view of a power transmission unit according to another embodiment of the present invention, and FIG. 5B is a perspective view of a power transmission unit according to another embodiment of the present invention.
6 is a diagram illustrating a graph of a performance index of a power transmission unit and an inductance according to an area of a second shielding member according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. In the drawings, in order to clearly and briefly describe the present invention, the illustration of parts not related to the description is omitted, and the same reference numerals are used for identical or extremely similar parts throughout the specification.

The suffixes "module" and "unit" for the constituent elements used in the following description are given in consideration of only the ease of writing in the present specification, and do not impart a particularly important meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably with each other.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or additional possibility of additions or numbers, steps, actions, components, parts, or combinations thereof, is not preliminarily excluded.

In addition, in this specification, terms such as first and second may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

1 is a block diagram illustrating a wireless power system according to an embodiment of the present invention.

Referring to FIG. 1, the wireless power system 10 may include, for example, a wireless power transmission device 100 for wirelessly transmitting power and a wireless power receiving device 200 for receiving transmitted power. .

The wireless power transmission device 100 is a magnetic induction phenomenon in which a current is induced in the coil 281 provided in the wireless power receiving device 200 according to a change in a magnetic field due to a current flowing through the coil 181 By using, power may be wirelessly transmitted to the wireless power receiving apparatus 200. In this case, the wireless power transmission device 100 and the wireless power receiving device 200 may use, for example, a wireless charging method of an electromagnetic induction method defined by a Wireless Power Consortium (WPC) or a Power Matters Alliance (PMA). . Alternatively, the wireless power transmission device 100 and the wireless power reception device 200 may use a magnetic resonance wireless charging method defined in the Alliance for Wireless Power (A4WP), for example.

Hereinafter, in order to distinguish between the coil 181 provided in the wireless power transmission device 100 and the coil 281 provided in the wireless power receiving device 200, the coil 181 provided in the wireless power transmission device 100 ) May be referred to as a transmitting coil, and the coil 281 provided in the wireless power receiving apparatus 200 may be referred to as a receiving coil.

According to an embodiment, one wireless power transmission device 100 may transmit power to a plurality of wireless power reception devices 200. In this case, the wireless power transmission device 100 may transmit power to the plurality of wireless power reception devices 200 according to, for example, a time division method, but the present invention is not limited thereto, and a plurality of wireless power reception devices (200) Power may be transmitted to the plurality of wireless power receiving apparatuses 200 using different frequency bands allocated to each.

Meanwhile, the number of wireless power receiving devices 200 capable of receiving power from one wireless power transmitting device 100 is, for example, the required amount of power and wireless power transmission of each of the plurality of wireless power receiving devices 200. It may be adaptively determined in consideration of the amount of available power of the device 100.

According to another embodiment, a plurality of wireless power transmission devices 100 may transmit power to at least one wireless power reception device 200. In this case, the at least one wireless power receiving device 200 may be simultaneously connected with the plurality of wireless power transmitting devices 100, for example, and may simultaneously receive power from the connected wireless power transmitting device 100. .

Meanwhile, the number of wireless power transmission devices 100 may be adaptively determined in consideration of, for example, the amount of power required for each of the at least one wireless power receiving device 200 and the amount of available power of the wireless power transmission device 100. I can.

The apparatus 200 for receiving power wirelessly may receive power transmitted from the apparatus 100 for transmitting power wirelessly, for example.

For example, the wireless power receiving apparatus 200 includes wearable devices such as a mobile phone, a laptop computer, and a smart watch, personal digital assistants (PDAs), and portable multimedia players (PMPs). , Navigation, MP3 player, electric toothbrush, lighting device, may be an electronic device such as a remote control, but the present invention is not limited thereto, and any electronic device capable of charging a battery is sufficient.

The wireless power transmission apparatus 100 and the wireless power reception apparatus 200 may communicate with each other, for example. Depending on the embodiment, the wireless power transmission apparatus 100 and the wireless power reception apparatus 200 may perform one-way communication or half-duplex communication.

In this case, the communication method may be an in-band communication method using the same frequency band and/or an out-of-band communication method using different frequency bands.

On the other hand, the data transmitted and received between the wireless power transmission device 100 and the wireless power receiving device 200 is data related to the state of the device, data on power consumption, data on battery charging, the output voltage of the battery, and / Alternatively, it may include data related to the output current and data related to a control command.

2 is an internal block diagram of an apparatus for transmitting power wirelessly according to an embodiment of the present invention.

Referring to FIG. 2, the wireless power transmission device 100 includes, for example, a control unit 160 for controlling each component provided in the wireless power transmission device 100, and a wireless power driver for converting DC power into AC power. 170 and a power transmission unit 180 for wirelessly transmitting power using the converted AC power.

In addition, the wireless power transmission device 100 includes, for example, a converter 110 that converts the commercial AC power source 405 into a DC power source, a memory storing a control program for driving the wireless power transmission device 100, and the like. (120), a sensing unit 130 that senses a current and/or voltage input to a configuration provided in the power transmission unit 180, and/or communicates with the wireless power receiving device 200 according to a predetermined communication method The first and second communication units 140 and 150 may be further included.

The converter 110 may rectify and output the input AC power to DC power, for example. In this case, the AC power may be, for example, a single-phase AC power or a three-phase AC power. For example, each component included in the wireless power transmission apparatus 100 may be operated by DC power output from the converter 110.

In the drawings, the commercial AC power source 405 is shown as a single-phase AC power source, but the present invention is not limited thereto, and may be a three-phase AC power source. Meanwhile, the internal structure of the converter 110 may also vary according to the type of the commercial AC power source 405.

The converter 110 may include, for example, a bridge diode. For example, a pair of upper-arm diode elements and lower-arm diode elements, each connected in series with each other, may be a pair, and a total of two or three pairs of upper-arm diode elements may be connected in parallel with each other. Meanwhile, the converter 110 may further include a plurality of switching elements, for example.

The memory 120 may store various data for the overall operation of the wireless power transmission apparatus 100, such as, for example, a program for processing or controlling the controller 160.

The sensing unit 130 may sense, for example, a current, a voltage, and a temperature of the transmission coil 181 input to the power transmission unit 180. For example, when the power transmission unit 180 includes a transmission coil 181 and a capacitor connected to the transmission coil 181, the sensing unit 130 may have a voltage V1 applied to both ends of the coil and the capacitor. ) And the voltage V2 applied to both ends of the coil can be detected.

The first and second communication units 140 and 150 may communicate with, for example, the wireless power receiving apparatus 200.

The first communication unit 140 may communicate with, for example, a first communication method. The first communication unit 140 may transmit a signal including, for example, data on the state of the device, data on power usage, and the like to the wireless power receiving device 200, and from the wireless power receiving device 200 A signal including data on the state of the device, data on power usage, data on battery charging, and the like may be received.

The second communication unit 150 may communicate with the wireless power receiving apparatus 200 through a second communication method different from the first communication method. The second communication unit 150 may transmit a signal including, for example, data on the state of the device, data on power usage, and the like to the wireless power receiving device 200, and from the wireless power receiving device 200 A signal including data on the state of the device, data on power usage, data on battery charging, and the like may be received.

The first and second communication units 140 and 150 are, for example, for modulating/demodulation of a signal transmitted from the wireless power transmission device 100 and a signal received from the wireless power receiving device 200, It may further include a modem unit (not shown).

The first and second communication units 140 and 150 may further include, for example, a filter unit (not shown) for filtering a signal received from the wireless power receiving apparatus 200. In this case, the filter unit may include, for example, a band pass filter (BPF).

Meanwhile, the first communication method may be, for example, an in-band communication method using the same frequency band as the wireless power receiving apparatus 200. In addition, the second communication method may be, for example, an out-of-band communication method using a frequency band different from that of the wireless power receiving apparatus 200.

Meanwhile, the communication method used in the wireless power transmission apparatus 100 may be changed to at least one of the first and second communication methods, based on, for example, data on the wireless power reception apparatus 200.

The control unit 160 may be connected, for example, to each component provided in the wireless power transmission device 100, and the control unit 160 may include, for example, each component provided in the wireless power transmission device 100 Signals can be transmitted and received with each other, and the overall operation of each component can be controlled.

The controller 160 may communicate with the wireless power receiving apparatus 200 through at least one of the first and second communication units 140 and 150, for example.

The control unit 160 generates a driving signal Sic based on, for example, a PWM generator 160a that generates a signal of a pulse width modulation (PWM) and a PWM signal to generate a wireless power driver. A driver 160b outputting to 170 may be provided.

The wireless power driver 170 may include at least one switching element (not shown) for converting DC power into AC power, for example. For example, when the switching element is an insulated gate bipolar transistor (IGBT), the driving signal Sic output from the driver 160b may be input to the gate terminal of the switching element.

Meanwhile, the switching element provided in the wireless power driver 170 may perform a switching operation according to, for example, a driving signal Sic, and DC power is converted into AC power by the switching operation of the switching element. , May be output to the power transmission unit 180.

The wireless power driver 170 may include, for example, an inverter (not shown) including a plurality of switching elements.

The power transmission unit 180 may include, for example, a transmission coil 181. The power transmission unit 180 may include, for example, a plurality of identical/similar coils (not shown).

The transmission coil 181 may include, for example, a circular shape, a polygonal shape such as a triangle or a square, but is not limited thereto.

On the other hand, the transmission coil 181, for example, is spaced apart from the reception coil 281 provided in the wireless power reception device 200, the leakage inductance is high, the coupling factor (coupling factor) is low, so transmission efficiency is It can be low.

In order to solve this problem, the power transmission unit 180 provided in the wireless power transmission apparatus 100 according to various embodiments of the present invention includes, for example, a capacitor element connected to the transmission coil 181 (not shown). ) May be further included, and a resonance circuit with the receiving coil 281 provided in the wireless power receiving apparatus 200 may be formed.

The capacitor element connected to the transmission coil 181 may be connected in series to the transmission coil 181, for example. Depending on the embodiment, it may be connected in parallel to the transmission coil 181 to form a resonance circuit.

The power transmission unit 180 may determine, for example, a resonant frequency of power transmission.

The power transmission unit 180 may further include, for example, a shielding material (not shown) disposed on one side of the transmission coil 181 to shield a leaking magnetic field.

The shielding material may include, for example, a first shielding member (not shown) disposed on one side of the transmission coil 181 and a second shielding member (not shown) disposed on the other side of the transmission coil 181. .

The first and second shielding members are, for example, one or two or more selected from the group consisting of cobalt (Co), iron (Fe), nickel (Ni), boron (B), silicon (Si), etc. It may contain ferrite made of a combination of elements.

The first and second shielding members may be made of a soft magnetic material that is easy to demagnetize and has a low hysteresis loss.

The area of the first shielding member may be larger than an area in which the transmitting coil 181 is disposed so that, for example, the leakage magnetic field is reduced and the directionality of the magnetic field is maximized.

The first shielding member may include, for example, a first protruding surface (not shown) formed to surround the outer periphery of the transmission coil 181. For example, the transmission coil 181 may be disposed in an inner space surrounded by the first protruding surface.

The first shielding member may include, for example, a second protruding surface (not shown) formed to be wrapped around the inner circumference of the transmission coil 181. For example, the second protruding surface may be disposed to protrude by being inserted into a blank area at the center of the transmitting coil 181.

The transmission coil 181 may be disposed between, for example, a first protruding surface and a second protruding surface of the first shielding member.

The second shielding member may be disposed to cover a part of the other surface of the transmission coil 181, for example. The area of the second shielding member may be, for example, smaller than the area in which the transmission coil 181 is disposed.

The second shielding member may be disposed to contact the second protruding surface of the first shielding member, for example. For example, the second shielding member may be disposed so as to contact the second protruding surface derived from the center of the transmission coil 181 and to cover a portion of the other surface of the transmission coil 181.

The shape of the first shielding member and/or the second shielding member may correspond to, for example, the shape of the transmitting coil 181. For example, when the shape of the transmission coil 181 is circular, the shape of the first shielding member and/or the second shielding member may also be circular.

Meanwhile, the height of the first protruding surface may be determined based on a coupling coefficient (k) between the transmitting coil 181 and the receiving coil 281 of the wireless power receiving apparatus 200. Here, the coupling coefficient k may mean, for example, an index indicating the degree of electronic coupling between two coils.

On the other hand, the figure of merit, which means power transmission/reception efficiency between the wireless power transmission device 100 and the wireless power reception device 200, is, for example, as shown in Equation 1 below, with the transmission coil 181 It may be determined through a coupling coefficient k between the receiving coils 281 of the wireless power receiving apparatus 200 and a quality factor Q of the transmitting coil 181. Here, the quality factor Q may mean, for example, an index of energy that can be accumulated in the vicinity of the wireless power transmission device 100 or the wireless power reception device 200.

More specifically, the quality factor (Q) of the transmitting coil 181 is proportional to the inductance of the transmitting coil 181 and inversely proportional to the resistance, that is, the amount of power loss generated by the transmitting coil 181. .

At this time, by the first protruding surface formed to surround the outer circumference of the transmitting coil 181 and the second protruding surface formed to be wrapped by the inner circumference of the transmitting coil 181, the receiving from the transmitting coil 181 The magnetic flux leaking without going to the coil 281 decreases, and the magnetic flux from the transmitting coil 181 to the receiving coil 281 increases, and as a result, the inductance of the transmitting coil 181 increases. , The quality factor Q of the transmission coil 181 is increased.

In addition, magnetic flux from the transmitting coil 181 to the receiving coil 281 is further increased by the second shielding member that contacts the second protruding surface and covers a part of the transmitting coil 181, so that the transmitting coil The quality factor Q of (181) becomes higher.

Therefore, as described above, according to various embodiments of the present invention, the quality factor (Q) of the transmitting coil 181 can be increased due to the first protruding surface, the second protruding surface, and the second shielding member of the first shielding member. In addition, power transmission/reception efficiency can be improved through this.

At this time, the higher the height of the first protruding surface, the second protruding surface and/or the second shielding member, the higher the quality factor Q of the transmitting coil 181 may be, but the transmitting coil 181 and the receiving coil 281 The coupling coefficient k between) may decrease. Accordingly, the heights of the first protruding surface, the second protruding surface, and/or the second shielding member may be determined in consideration of power transmission/reception efficiency.

The controller 160 may transmit and receive signals through, for example, a transmission coil 181 provided in the power transmission unit 180.

The control unit 160, for example, through the transmission coil 181, to determine the existence of the object located in the charging area, to output the object detection signal, each component provided in the wireless power transmission device 100 Can be controlled. The object detection signal may be, for example, a very short pulsed analog ping (AP) signal.

The controller 160 may determine whether an object exists in the charging area based on, for example, a change amount of the current flowing through the transmission coil 181 according to the output of the object detection signal.

The control unit 160 is provided in the wireless power transmission device 100 so that a reception device detection signal is output for awakening the wireless power reception device 200, for example, through the transmission coil 181. Each configuration can be controlled. The reception device detection signal may be, for example, a digital ping (DP) signal.

The digital ping (DP) signal may have a higher duty than the analog ping (AP) signal in order to attempt to establish communication with the wireless power receiving apparatus 200, for example.

Meanwhile, the controller 160 may receive, for example, a response signal to a reception device detection signal output from the wireless power reception device 200 through the transmission coil 181. For example, the wireless power receiver 200 may modulate a digital ping (DP) signal and transmit the modulated digital ping (DP) signal to the wireless power transmission device 100 as a response signal. have.

The control unit 160 may determine whether the object located in the charging area is the wireless power receiving device 200 based on, for example, a response signal to the receiving device detection signal. For example, the controller 160 may obtain digital data by demodulating the modulated digital ping (DP) signal received as a response signal, and based on the acquired data, the charging area It may be determined whether the positioned object is the wireless power receiver 200.

The control unit 160 may calculate, for example, the quality factor Q of the transmission coil 181.

For example, the control unit 160, through the sensing unit 130, the voltage (V1) applied to the transmission coil 181 and the capacitor connected to the transmission coil 181, both ends of the transmission coil 181 The applied voltage V2 may be detected, and a quality factor of the transmitting coil 181 may be calculated based on this.

Specifically, the control unit 160 may calculate a quality factor of the transmission coil 181 according to Equation 2 below, for example.

In the present invention, in order to calculate the quality factor, the voltage V1 applied to the transmitting coil 181 and the capacitor and the voltage V2 applied to both ends of the transmitting coil 181 are described as being detected. This is not limited thereto, and a quality factor may be calculated by detecting the voltage V2 applied to both ends of the transmission coil 181 and the voltage V3 applied to both ends of the capacitor.

The controller 160 may control each component included in the wireless power transmission device 100, for example, and transmit power to the wireless power reception device 200 through the power transmission unit 180.

When the control unit 160 includes, for example, a plurality of coils, the power transmission unit 180 may be referred to as, for example, a coil unit or a coil unit.

3 is an internal block diagram of an apparatus for receiving wireless power according to an embodiment of the present invention.

Referring to FIG. 3, the wireless power receiver 200 includes, for example, a power receiver 280 for wirelessly receiving power from the wireless power transmitter 100, a rectifier 210 for rectifying the received power, A switching regulator controller 230 may be included to control the switching regulator 220 and/or the switching regulator 220 to stabilize the rectified power to output operating power to the load.

In addition, the apparatus 200 for receiving power wirelessly may further include a first communication unit 240 and a second communication unit 250 for communicating with the wireless power transmission apparatus 100, for example.

The power receiver 280 may receive, for example, power transmitted from the power transmitter 180. To this end, the power receiving unit 280 may include, for example, at least one coil 281.

The receiving coil 281 may generate an induced electromotive force by, for example, a magnetic field generated in the transmitting coil 181. Electric power by the induced electromotive force may be supplied to the load through, for example, the rectifier 210 and the switching regulator 220. For example, when the load is a battery, electric power by induced electromotive force may be used to charge the battery. In the present invention, it is described that the load supplied with power through the rectifier 210 and the switching regulator 220 is a battery, but the present invention is not limited thereto.

The receiving coil 281 may be formed, for example, on a printed circuit board (PCB) in a thin film form of a conductive pattern. The receiving coil 281 may be printed on a pad (not shown) in a closed loop shape, for example. The polarity of the receiving coil 281 may be, for example, a shape wound so as to have polarity in the same direction.

Meanwhile, the wireless power receiving apparatus 200 further includes at least one capacitor (not shown) for forming a resonant circuit with the power transmission unit 180 provided in the wireless power transmission apparatus 100, for example. can do. At this time, the capacitor may be connected in series or parallel to the receiving coil 281, for example.

Meanwhile, the wireless power receiving apparatus 200 may further include, for example, a shielding material (not shown) disposed on one side of the receiving coil 281 to shield a leaked magnetic field. For example, the wireless power receiving apparatus 200 may include a shielding material identical/similar to the shielding material provided in the wireless power transmitting apparatus 100.

The rectifying unit 210 may rectify power received through the receiving coil 281, for example. The rectifying unit 210 may include at least one diode (not shown).

The switching regulator 220 may supply power rectified by the rectifying unit 210 to the battery under the control of the switching regulator controller 230, for example. For example, the switching regulator 220 may output the power rectified by the rectifier 210 to the charging power v supplied to the battery.

The switching regulator controller 230 may control the charging power v to be output to the battery by outputting the regulator control signal Src to the switching regulator 220, for example.

Meanwhile, the switching regulator 220 may perform DC-DC conversion according to, for example, a regulator control signal Src from the switching regulator controller 230 to adjust an output voltage. The switching regulator 220 may output a charging power source v having a voltage of a predetermined size based on, for example, the regulator control signal Src.

On the other hand, in the wireless power receiving apparatus 200, for example, when a separate processor is not included and the rectified charging power supply v is output with a predetermined voltage by the switching regulator 220, The switching regulator 220 may be controlled by the switching regulator controller 230. When the apparatus 200 for receiving power wirelessly does not include a processor, the hardware configuration is simplified and power consumption is reduced.

Figure 4a is an exploded perspective view of a power transmission unit according to an embodiment of the present invention, Figure 4b is a perspective view of the power transmission unit according to an embodiment of the present invention, and Figure 4c is, according to an embodiment of the present invention, It is a cross-sectional view of the power transmission unit.

4A and 4B, the power transmission unit 180 may include a transmission coil 181, a first shielding member 190, and a second shielding member 195.

In this drawing, the shape of the transmitting coil 181 is described in a circular shape, but the present invention is not limited thereto.

When the shape of the transmission coil 181 is circular, the shape of the first shielding member 190 and/or the second shielding member 195 may also be circular.

The first shielding member 190 includes a receiving surface 191 on which the transmitting coil 181 is disposed, a first protruding surface 192 formed to surround the outer circumference of the transmitting coil 181, and the transmitting coil 181. It may include a second protruding surface 193 formed to be wrapped around the inner circumference.

The transmission coil 181 may have one surface disposed on the receiving surface 191 between the first protruding surface 192 and the second protruding surface 193 of the first shielding member 190, and the second protruding surface ( 193 may be inserted and protruded in a blank area at the center of the transmission coil 181.

An area of the first shielding member 190 may be larger than an area in which the transmitting coil 181 is disposed.

The second shielding member 195 may be disposed to contact the second protruding surface 193 derived from the center of the transmission coil 181 and to cover a part of the other surface of the transmission coil 181.

The area of the second shielding member 195 may be smaller than the area in which the transmitting coil 181 is disposed.

Referring to FIG. 4C, the height h1 of the first protruding surface 192 of the first shielding member 190 is the height h2 of the second protruding surface 193 and the height of the second shielding member 195 It may be greater than or equal to the sum of (h3).

5A is an exploded perspective view of a power transmission unit according to another embodiment of the present invention, and FIG. 5B is a perspective view of a power transmission unit according to another embodiment of the present invention.

5A and 5B, the power transmission unit 180 may include a plurality of transmission coils 181a, 181b, 181c, a first shielding member 190, and a second shielding member 195.

In the present drawing, the shape of each of the plurality of transmitting coils 181a, 181b, 181c is described as a circular sector, and the overall shape of the plurality of transmitting coils 181a, 181b, 181c is described as a circular shape, but the present invention is limited thereto. It is not.

The first shielding member 190 includes a receiving surface 191 on which a plurality of transmitting coils 181a, 181b, 181c are disposed, and a first formed to surround the outer circumference of the plurality of transmitting coils 181a, 181b, 181c. It may include a protruding surface 192 and a second protruding surface 193 formed to be wrapped around an inner circumference of each of the plurality of transmitting coils 181a, 181b, 181c.

One surface of the plurality of transmitting coils 181a, 181b, 181c may be disposed on the receiving surface 191 between the first protruding surface 192 and the second protruding surface 193 of the first shielding member 190, and , The second protruding surface 193 may be inserted into a blank area at the center of each of the plurality of transmission coils 181a, 181b, and 181c to protrude.

An area of the first shielding member 190 may be larger than an area in which the plurality of transmission coils 181a, 181b, 181c are disposed.

The second shielding member 195 is in contact with the second protruding surface 193 derived from the center of each of the plurality of transmitting coils 181a, 181b, 181c, and among the other surfaces of the plurality of transmitting coils 181a, 181b, 181c. It can be arranged to cover a part.

The area of the second shielding member 195 may be smaller than the area in which the transmitting coil 181 is disposed.

6 is a diagram showing a graph of a figure of merit and an inductance of a power transmission unit according to an area of a second shielding member according to an embodiment of the present invention.

Meanwhile, referring to the graph 610 of the inductance of the transmission coil 181 of FIG. 6, it can be seen that the inductance increases as the area of the second shielding member 195 increases.

Meanwhile, referring to a graph 610 for a figure of merit indicating power transmission/reception efficiency between the wireless power transmission device 100 and the wireless power reception device 200 of FIG. 6, the second shielding member 195 It can be seen that as the area of) increases to a certain level, the figure of merit increases.

In this case, when the area of the second shielding member 195 is greater than a certain level and the other surface of the transmitting coil 181 is excessively covered, the figure of merit is rather reduced.

Accordingly, the area of the second shielding member 195 may be determined based on a figure of merit of the wireless power system 10.

The accompanying drawings are only for making it easier to understand the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and scope of the present invention It should be understood to include water or substitutes.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

Claims (10)

At least one transmitting coil;
A first shielding member disposed on one surface of the at least one transmitting coil; And
Including a second shielding member disposed on the other surface of the at least one transmission coil,
The first shielding member,
A first protruding surface formed to surround an outer circumference of the at least one transmitting coil; And
And a second protruding surface formed to be wrapped around an inner circumference of the at least one transmitting coil,
The second shielding member,
In contact with the second protruding surface, the wireless power transmission device, characterized in that arranged to cover a portion of the other surface of the at least one transmission coil. The method of claim 1,
The first and second shielding members are wireless power transmission device, characterized in that made of a soft magnetic material (soft magnetic material). The method of claim 2,
The area of the first shielding member is larger than an area corresponding to the at least one transmitting coil,
The wireless power transmission device, characterized in that the area of the second shielding member is smaller than an area corresponding to the at least one transmission coil. The method of claim 3,
The wireless power transmission device, wherein the height of the first protruding surface is equal to or greater than a sum of the height of the second protruding surface and the height of the second shield member. The method of claim 4,
The at least one transmitting coil includes a plurality of transmitting coils,
The second protruding surface is a wireless power transmission device, characterized in that formed so as to be wrapped around the inner circumference of each of the plurality of transmission coils. The method of claim 5,
The second shielding member is a wireless power transmission device, characterized in that arranged to cover a portion of the other surface of each of the plurality of transmission coils. The method of claim 6,
An inverter having a plurality of switching elements and converting DC power into AC power according to a switching operation of the plurality of switching elements; And
Further comprising a control unit for controlling the inverter,
The control unit,
And controlling the inverter so that currents flowing through the plurality of transmission coils are independently controlled. At least one transmitting coil;
A first shielding member disposed on one surface of the at least one transmitting coil; And
Including a second shielding member disposed on the other surface of the at least one transmission coil,
The first shielding member,
A first protruding surface formed to surround an outer circumference of the at least one transmitting coil; And
And a second protruding surface formed to be wrapped around an inner circumference of the at least one transmitting coil,
The second shielding member,
An electroless power transmission device, which is in contact with the second protruding surface and is disposed to cover a portion of the other surface of the at least one transmission coil; And
A wireless power system comprising a wireless power receiving device comprising at least one receiving coil and receiving power from the wireless power transmitting device. The method of claim 8,
The height of the first protruding surface is,
It is equal to or greater than the sum of the height of the second protruding surface and the height of the second shield member,
The wireless power transmission apparatus, characterized in that it is determined based on a coupling coefficient between the at least one transmission coil and the at least one reception coin. The method of claim 9,
The wireless power receiving device,
A third shielding member disposed on one surface of the at least one receiving coil; And
Further comprising a fourth shielding member disposed on the other surface of the at least one receiving coil,
The third shielding member,
A third protruding surface formed to surround an outer circumference of the at least one receiving coil; And
And a fourth protruding surface formed to be wrapped around an inner circumference of the at least one receiving coil,
The fourth shielding member,
A wireless power system, characterized in that it is disposed to be in contact with the fourth protruding surface and to cover a portion of the other surface of the at least one receiving coil.

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