KR20190018460A - Wireless power receiving apparatus and wireless power transmitting system comprising the same - Google Patents

Abstract

The present invention provides a wireless power receiving apparatus and a wireless power transmitting system including the same. According to an embodiment of the present invention, the wireless power receiving apparatus, which is wirelessly charged with power, comprises: a substrate; a soft magnetic layer laminated on the substrate and having a plurality of patterns including at least three lines radiated from a predetermined point; and a coil laminated on the soft magnetic layer and receiving electromagnetic energy radiated from the wireless power transmitting system.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power receiving apparatus and a wireless power transmission system including the wireless power receiving apparatus.

The present invention relates to wireless charging, and more particularly, to a wireless power receiving apparatus and a wireless power transmission system including the same.

Wireless power transmission and reception technology is a technology for wirelessly supplying power to electronic devices. In order to increase the power transmission / reception efficiency, it is necessary to minimize the energy loss between the wireless power transmission apparatus and the wireless power reception apparatus. To this end, a soft magnetic material may be disposed around the transmitting and receiving antennas so that the electromagnetic energy emitted by the transmitting antenna can be focused in the direction of the receiving antenna. When the soft magnetic layer is a sheet containing a ferrite material, the permeability is good, but the thickness is limited due to the limitation of high-temperature baking and magnetic flux density. Further, when the soft magnetic layer is a composite sheet including a metal powder and a polymer resin, there is a problem that the permeability is lowered.

On the other hand, when the soft magnetic layer is a metal ribbon, a high permeability and magnetic flux density can be obtained with a thin thickness. Therefore, a technique for applying the metal ribbon to the soft magnetic layer is needed.

SUMMARY OF THE INVENTION The present invention provides a wireless power receiving apparatus and a wireless power transmission system including the wireless power receiving apparatus.

A wireless power receiving apparatus for wirelessly charging power according to an embodiment of the present invention includes a substrate, a soft magnetic layer stacked on the substrate and having a plurality of patterns including three or more lines radiating from a predetermined point, And a coil stacked on the soft magnetic layer and receiving electromagnetic energy radiated from the wireless power transmission device.

The pattern may further comprise a border surrounding three or more lines radiating from the predetermined point.

The rim may surround six or more lines radiating from the predetermined point.

The pattern may further include a border surrounding at least two lines of three or more lines emitted from the predetermined point.

One pattern may be arranged to be enclosed by another three to eight patterns.

The pattern may be formed as a crack.

The soft magnetic layer may be a metal ribbon containing Fe.

A frequency band of 100 kHz to 200 kHz can be used.

The average diameter of the pattern may be between 50 μm and 600 μm.

A wireless power transmission system in accordance with an embodiment of the present invention includes a wireless power transmission device including a soft magnetic core and a transmission coil formed on the soft magnetic core and a substrate, A reception coil which is stacked on the soft magnetic layer and receives electromagnetic energy radiated from the wireless power transmission device, a reception coil connected to the reception coil and configured to receive the electromagnetic energy And a wireless power receiving apparatus including a circuit unit for converting the electric energy into electric energy, and a storage unit for storing the electric energy.

According to the embodiment of the present invention, a metal ribbon having a high effective permeability within a frequency range used for wireless charging can be obtained. As a result, a wireless power transmission system that is slim but has high power transmission efficiency can be obtained.

1 is a magnetic induction equivalent circuit.
FIG. 2 is a block diagram illustrating a transmitter as one of the sub-systems constituting the wireless power transmission system.
FIG. 3 is a block diagram illustrating a receiver as one of subsystems constituting a wireless power transmission system.
4 is a diagram illustrating a portion of a wireless power transmission apparatus according to an embodiment of the present invention.
5 is a diagram illustrating a portion of a wireless power receiving apparatus according to an embodiment of the present invention.
FIG. 6 is a graph comparing the actual permeability per frequency before and after the formation of cracks in the metal ribbon.
7 to 9 show a top view of a soft magnetic layer according to an embodiment of the present invention.
10 to 11 are top views of a soft magnetic layer according to another embodiment of the present invention.
12 shows a top view of a soft magnetic layer according to another embodiment of the present invention.
13 shows the metal ribbon used in Comparative Example 1. Fig.
14 shows the metal ribbon used in Example 1. Fig.
Fig. 15 shows the metal ribbon used in Example 2. Fig.
16 shows the metal ribbon used in Example 3. Fig.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

Hereinafter, a detailed description will be given with reference to the drawings of a wireless power transmission system according to an embodiment of the present invention. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

Embodiments use a variety of frequency bands from low frequency (50 kHz) to high frequency (15 MHz) selectively for wireless power transmission, and it is necessary to support a communication system capable of exchanging data and control signals for system control .

The embodiments can be applied to various industrial fields such as a mobile terminal industry using a battery or an electronic device required, a smart clock industry, a computer and notebook industry, a household appliance industry, an electric car industry, a medical device industry, and a robot industry .

Embodiments may consider a system capable of power transmission to one or more multiple devices using one or more transmit coils that provide the device.

According to the embodiment, it is possible to solve the battery shortage problem in a mobile device such as a smart phone and a notebook. For example, when a wireless charging pad is placed on a table and a smart phone or a notebook is used on the table, the battery is automatically charged and can be used for a long time . Also, by installing wireless charging pads in public places such as cafes, airports, taxis, offices, restaurants, etc., it is possible to charge various mobile devices irrespective of charging terminals depending on mobile device manufacturers. In addition, when wireless power transmission technology is applied to household electrical appliances such as cleaners, electric fans, etc., there is no need to look for power cables and complex wires can be eliminated in the home, which can reduce wiring in buildings and increase the space utilization. In addition, it takes a lot of time to charge the electric car with the current household power, but if the high power is transmitted through the wireless power transmission technology, the charging time can be reduced. If the wireless charging facility is installed at the bottom of the parking lot, It is possible to solve the inconvenience of having to prepare.

The terms and abbreviations used in the examples are as follows.

Wireless Power Transfer System: A system that provides wireless power transmission within a magnetic field region

Wireless Power Transfer System-Charger: A device that provides wireless power transmission to power receivers of multiple devices within a magnetic field area and manages the entire system.

Wireless Power Transfer System-Deivce: A device that is provided with a wireless power transmission from a power transmitter within a magnetic field area.

Charging Area: A region where actual wireless power transmission occurs within the magnetic field region, and may vary depending on the size, required power, and operating frequency of the application product.

Scattering parameter: The S parameter is the ratio of the input port to the output port in terms of the input voltage to the output voltage on the frequency distribution (Transmission S21) or the self reflection value of each input / output port, Reflection (S11, S22) of the reflected output.

Quality factor Q: The value of Q in resonance means the quality of frequency selection. The higher the Q value, the better the resonance characteristics. The Q value is expressed as the ratio of the energy stored in the resonator to the energy lost.

One of the principles of wireless power transmission is magnetic induction.

The magnetic induction method is a noncontact energy transfer technique in which an electromotive force is generated in the load inductor Ll via a magnetic flux generated when the source inductor Ls and the load inductor L1 are brought close to each other and a current is supplied to one of the source inductors Ls .

1 is a magnetic induction equivalent circuit.

Referring to FIG. 1, in a magnetic induction equivalent circuit, a transmitter includes a source voltage Vs, a source resistance Rs, a source capacitor Cs for impedance matching, and a magnetic coupling with a receiving unit, And a load coil Rl for an impedance matching and a load coil Ll for magnetic coupling with a transmitting unit. The load coil Rl may be implemented as a source coil Ls for impedance matching, And the degree of magnetic coupling between the source coil Ls and the load coil Ll can be expressed by mutual inductance Msl.

In FIG. 1, the ratio S21 of the input voltage to the output voltage is obtained from the magnetic induction equivalent circuit consisting only of the coil only without the source capacitor Cs for impedance matching and the load capacitor Cl, The power transmission condition satisfies Equation (1) below.

Equation 1

Ls / Rs = L1 / R1

The maximum power transmission is possible when the ratio of the inductance of the transmission coil Ls to the source resistance Rs and the ratio of the inductance of the load coil Ll to the load resistance Rl are equal to each other. Since there is no capacitor capable of compensating for reactance in a system having only inductance, the self reflection value S11 of the input / output port can not be zero at the point where the maximum power transfer is made, and the mutual inductance Msl, The power transfer efficiency can vary greatly depending on the value. Thus, the source capacitor Cs may be added to the transmitter as a compensation capacitor for impedance matching, and the load capacitor Cl may be added to the receiver. The compensation capacitors Cs and Cl may be connected in series or in parallel to the receiving coil Ls and the load coil Ll, respectively. For impedance matching, a passive element such as an additional capacitor and an inductor may be added to each of the transmitter and the receiver as well as the compensation capacitor.

Based on such a wireless power transmission principle, a wireless power transmission system for transmitting power by a magnetic induction method or a self resonance method will be described.

FIG. 2 is a block diagram illustrating a transmitter as one of the sub-systems constituting the wireless power transmission system.

2, the wireless power transmission system may include a transmitting unit 1000 and a receiving unit 2000 for receiving power wirelessly from the transmitting unit 1000. The transmitting unit 1000 may include a transmitting side AC / A transmission side DC / AC conversion unit 1200, a transmission side impedance matching unit 1300, a transmission coil unit 1400, and a transmission side communication and control unit 1500. In this specification, the transmission unit 1000 can be mixed with a wireless power transmission apparatus.

The transmitting side AC / DC converting unit 1100 is a power converting unit for converting an AC signal provided from the outside under the control of the transmitting side communication and control unit 1500 to a DC signal. The transmitting side AC / DC converting unit 1100 includes: May include a rectifier 1110 and a transmission side DC / DC converter 1120 as a subsystem. The rectifier 1110 converts a supplied AC signal into a DC signal. The rectifier 1110 may be a diode rectifier having a relatively high efficiency in high-frequency operation, a synchronous rectifier capable of one-chip operation, And a hybrid rectifier capable of saving space and having a high degree of freedom in dead time. The transmitting side DC / DC converting unit 1120 adjusts the level of the DC signal provided from the rectifier 1110 under the control of the transmitting side communication and control unit 1500. As an example of implementing the DC signal, A buck converter, a boost converter that boosts the level of the input signal, a buck-boost converter or a Cuk converter that can raise or lower the level of the input signal. Also, the transmission side DC / DC converter 1120 includes a switch element that performs a power conversion control function, an inductor and a capacitor that perform a power conversion medium function or an output voltage smoothing function, a voltage gain control function or an electrical isolation function (insulation function) And may have a function of removing a ripple component or a ripple component (AC component included in the DC signal) included in the input DC signal. The error between the command value of the output signal of the transmitting side DC / DC converting unit 1120 and the actual output value can be adjusted through the feedback method and can be performed by the transmitting side communication and control unit 1500 .

The transmission side DC / AC conversion unit 1200 converts the DC signal output from the transmission side AC / DC conversion unit 1100 into an AC signal under the control of the transmission side communication and control unit 1500 and outputs the converted AC signal frequency A half bridge inverter or a full bridge inverter is an example of implementing this system. The transmission side DC / AC conversion unit 1200 may include an oscillator for generating a frequency of an output signal and a power amplifier for amplifying an output signal.

The transmission-side impedance matching unit 1300 minimizes the reflected waves at points having different impedances to improve the signal flow. Since the two coils of the transmitting unit 1000 and the receiving unit 2000 are spatially separated and the leakage of the magnetic field is large, the impedance difference between the two connecting ends of the transmitting unit 1000 and the receiving unit 2000 is corrected, . The impedance matching unit 1300 may include an inductor, a capacitor, and a resistor. Under the control of the communication and control unit 1500, the inductance of the inductor, the capacitance of the capacitor, The impedance value can be adjusted. The transmission impedance matching unit 1300 may have a series resonance structure or a parallel resonance structure when the magnetic induction type wireless power transmission system transmits electric power and the inductive coupling unit between the transmission unit 1000 and the reception unit 2000 The energy loss can be minimized by increasing the coefficient.

The transmitting coil 1400 may be implemented as a plurality of coils or a plurality of coils. If a plurality of transmitting coils 1400 are provided, they may be spaced apart from each other, The overlapping area can be determined in consideration of the deviation of the magnetic flux density. Also, when the transmission coil 1400 is manufactured, it can be manufactured in consideration of the internal resistance and the radiation resistance. If the resistance component is small, the quality factor can be increased and the transmission efficiency can be increased.

The communication and control unit 1500 may include a transmission side control unit 1510 and a transmission side communication unit 1520 as subsystems. The transmission-side controller 1510 may control the output voltage of the transmission-side AC / DC converter 1100 in consideration of the power demand of the receiver 2000, the current charge amount, and the wireless power scheme. The frequency and switching waveforms for driving the transmission side DC / AC conversion unit 1200 may be generated in consideration of the maximum power transmission efficiency to control power to be transmitted. Also, the overall operation of the receiver 2000 can be controlled by using an algorithm, a program, or an application required for the control read from the storage unit (not shown) of the receiver 2000. Meanwhile, the transmission-side controller 1510 may be referred to as a microprocessor, a microcontroller unit, or a microcomputer. The transmission-side communication unit 1520 can perform communication with the reception-side communication unit 2620, and can use a Bluetooth system as an example of a communication system. The transmission side communication unit 1520 and the reception side communication unit 2620 can transmit and receive the charging status information and the charging control command to each other. The charging status information may include the number of the receiving unit 2000, the remaining battery level, the number of times of charging, the amount of usage, the battery capacity, the battery ratio, and the transmission power amount of the transmission unit 1000. Side communication unit 1520 can transmit a charging function control signal for controlling the charging function of the receiving unit 2000 and the charging function control signal controls the receiving unit 2000 to enable or disable the charging function And may be a control signal for disabling the control signal.

Meanwhile, the transmitting unit 1000 may be configured with hardware different from the transmitting-side communication unit 1520, and the transmitting unit 1000 may be communicated in an out-band format. The transmitting unit 1000 and the transmitting-side communication unit 1520 may be implemented in one piece of hardware, and the transmitting unit 1000 may perform communication in an in-band format. The transmission side communication unit 1520 may be configured to be separate from the transmission side control unit 1510 and the reception side communication unit 2620 may be included in the control unit 2610 of the reception device .

FIG. 3 is a block diagram illustrating a receiver as one of subsystems constituting a wireless power transmission system.

3, the wireless power transmission system may include a transmitting unit 1000 and a receiving unit 2000 for wirelessly transmitting power from the transmitting unit 1000. The receiving unit 2000 includes a receiving coil unit 2100 A receiving side AC / DC converting unit 2300, a receiving side DC / DC converting unit 2400, a load unit 2500, and a receiving side communication and controlling unit 2600 have. In this specification, the receiving unit 2000 can be mixed with a wireless power receiving apparatus.

The receiving side coil part 2100 can receive electric power through a magnetic induction method, and one or a plurality of induction coils can be provided. The receiving side coil part 2100 may be provided with a near field communication antenna. The receiving side coil part 2100 may be the same as the transmitting side coil part 1400 and the dimensions of the receiving antenna may be changed according to the electrical characteristics of the receiving part 200. [

The receiving side matching unit 2200 performs impedance matching between the transmitter 1000 and the receiver 2000. [

The receiving-side AC / DC converter 2300 rectifies the AC signal output from the receiving-side coil part 2100 to generate a DC signal.

The receiving-side DC / DC converting section 2400 can adjust the level of the DC signal output from the receiving-side AC / DC converting section 2300 to match the capacity of the load section 2500.

The load unit 2500 may include a battery, a display, a sound output circuit, a main processor, and various sensors.

The receiving side communication and control unit 2600 can be activated by the wake-up power from the transmitting side communication and control unit 1500 and performs communication with the transmitting side communication and control unit 1500, The operation of the system can be controlled.

The receiving unit 2000 includes a single or a plurality of receiving units 2000, and can simultaneously receive energy from the transmitting unit 1000 wirelessly. That is, a plurality of target reception coil sections are independent from each other in the magnetic induction method, and a plurality of target reception sections 2000 can receive power from one transmission section 1000. At this time, the transmitter matching unit 1300 of the transmitter 1000 may adaptively perform impedance matching between the plurality of receivers 2000.

Further, if the receiving unit 2000 is composed of a plurality of units, the same type of system or different types of systems may be used.

Meanwhile, in the case of the radio power transmission of the magnetic induction type, the transmission side AC / DC conversion unit 1100 in the transmission unit 1000 converts the AC signal of 60 Hz to 110 V to 220 V And the transmission side DC / AC conversion unit 1200 can receive the DC signal and output the AC signal of 125 KHz. The receiving side AC / DC converting unit 2300 of the receiving unit 2000 receives the 125 KHz AC signal and converts it into a DC signal of 10 V to 20 V, and the receiving side DC / DC converting unit 2400 converts the DC For example, a 5V DC signal to the load unit 2500 and output it to the load unit 2500.

FIG. 4 is a diagram illustrating a portion of a wireless power transmission apparatus according to an exemplary embodiment of the present invention, and FIG. 5 is a diagram illustrating a portion of a wireless power reception apparatus according to an exemplary embodiment of the present invention. Here, the wireless power transmission apparatus may be a part of the configuration of the transmission unit 1000 of FIG. 2, and the wireless power reception apparatus may be a part of the configuration of the reception unit 2000 of FIG.

4, the wireless power transmission apparatus 100 includes a transmission circuit (not shown), a soft magnetic core 110, a transmission coil 120, and a permanent magnet 130.

The soft magnetic core 110 may be made of a soft magnetic material having a thickness of several mm. The permanent magnet 130 may be surrounded by the transmission coil 120. Here, the permanent magnet 130 is not an essential constitution, and may be omitted according to the specification.

5, the wireless power receiving apparatus 200 includes a receiving circuit (not shown), a soft magnetic layer 210, and a receiving coil 220. The soft magnetic layer 210 may be laminated on a substrate (not shown). The substrate may be composed of multiple layers of fixed sheets and may be bonded to the soft magnetic layer 210 to fix the soft magnetic layer 210.

The soft magnetic layer 210 concentrates the electromagnetic energy radiated from the transmitting coil 120 of the wireless power transmission apparatus 100.

The receiving coil 220 is stacked on the soft magnetic layer 210. The receiving coil 220 may be wound on the soft magnetic layer 210 in a direction parallel to the soft magnetic layer 210. For example, a receiving antenna applied to a smart phone may be in the form of a spiral coil having an outer diameter of 50 mm or less and an inner diameter of 20 mm or more. The receiving circuit converts the electromagnetic energy received through the receiving coil 220 into electric energy, and charges the battery (not shown) with the converted electric energy.

Although not shown, a heat-radiating layer may be further included between the soft magnetic layer 210 and the receiving coil 220. In this specification, the substrate, soft magnetic layer 210, and receive coil 220 may be referred to as receive antennas.

Meanwhile, when the wireless power receiving apparatus 200 has both the WPC function and the NFC (Near Field Communication) function, the NFC coil 230 may be further stacked on the soft magnetic layer 210. The NFC coil 230 may be formed so as to surround the outside of the receiving coil 220.

Each of the reception coil 220 and the NFC coil 230 may be electrically connected to each other through a terminal 240.

When the soft magnetic layer 210 is a sheet containing ferrite, the permeability is good, but there is a thickness limitation due to the limitation of high-temperature firing and magnetic flux density. In addition, when the soft magnetic layer 210 is a composite sheet including a metal powder and a polymer resin, there is a problem that the permeability is lowered due to the polymer resin. On the contrary, when the soft magnetic layer 210 is a metal ribbon, a high permeability and magnetic flux density can be obtained with a thin thickness. However, the metal ribbon has a problem of large magnetic loss in the frequency region used for wireless charging.

According to one embodiment of the present invention, a metal ribbon is used as the soft magnetic layer 210, and cracks are formed in the metal ribbon to reduce the eddy current loss.

FIG. 6 is a graph comparing the actual permeability per frequency before and after the formation of cracks in the metal ribbon. Here, the difference between the permeability and the permeability loss may mean the actual permeability.

Referring to FIG. 6, it can be seen that the actual permeability after the cracks are formed in the metal ribbon in the frequency region where wireless charging is used, for example, about 150 kHz band, is significantly larger than the actual permeability before cracks are formed.

As used herein, metal ribbon refers to an amorphous or nanocrystalline metal or alloy made of very thin foil through techniques such as atomizers. The thickness of the metal ribbon may be, for example, 0.01 mm to 0.04 mm. In this specification, the metal ribbon may be a metal ribbon containing iron (Fe).

When the metal ribbon is used as the soft magnetic layer 210 of the wireless power receiving apparatus 200, it is possible to reduce the eddy current loss and improve the transmission efficiency by forming a crack in the metal ribbon. However, when a non-uniform crack is formed in the metal ribbon, the effect of improving the transmission efficiency can be reduced by half, and the performance of the soft magnetic layer is uneven, and a reliable result can not be obtained.

According to one embodiment of the present invention, a uniform pattern of cracks is formed on the metal ribbon to improve the transmission efficiency of the soft magnetic layer and to make the performance uniform.

7 to 9 show a top view of a soft magnetic layer according to an embodiment of the present invention.

7 to 9, a pattern 700 including three or more lines 720 emitted from a predetermined point 710 is formed in the soft magnetic layer 210. Here, the pattern may be formed as a crack. At this time, a plurality of patterns 700 may be repeatedly formed in the soft magnetic layer 210, and one pattern 700 may be arranged so as to be surrounded by a plurality of patterns, for example, three to eight patterns 700 .

Thus, when a repetitive pattern is formed in the soft magnetic layer 210, the eddy current loss can be reduced and a uniform and predictable transmission efficiency can be obtained.

At this time, the average diameter of each pattern 700 may be 50 탆 to 600 탆. When the diameter of the pattern 700 is less than 50 mu m, metal particles may excessively occur on the surface of the metal ribbon at the time of crack formation. In the case where metal particles are present on the surface of the soft magnetic layer 210, there is a risk of circuit shorting because metal particles may penetrate into the circuit. On the other hand, when the diameter of the pattern 700 exceeds 600 mu m, the distance between the patterns 700 is large, so that the effect of crack formation, that is, the effect of increasing the actual permeability, may deteriorate.

10 to 11 are top views of a soft magnetic layer according to another embodiment of the present invention.

10 to 11, the soft magnetic layer 210 is formed with a pattern 700 including three or more lines 720 emitted from a predetermined point 710 and a frame 730 surrounding the lines 720. Here, the pattern may be formed as a crack. Here, the rim 730 is not a completely cut crack, a part may be continuous, and a part may mean a broken crack. At this time, a plurality of patterns 700 may be repeatedly formed in the soft magnetic layer 210, and one pattern 700 may be arranged so as to be surrounded by a plurality of patterns, for example, three to eight patterns 700 .

Thus, when a repetitive pattern is formed in the soft magnetic layer 210, the eddy current loss can be reduced and a uniform and predictable transmission efficiency can be obtained.

At this time, the average diameter of each pattern 700 may be 50 탆 to 600 탆. If the diameter of the pattern 700 is less than 50 mu m, metal particles may be formed on the surface of the metal ribbon at the time of crack formation. If there is excessive metal particles on the surface of the soft magnetic layer 210, there is a risk of circuit shorting because metal particles may penetrate into the circuit. On the other hand, when the diameter of the pattern 700 exceeds 600 mu m, the distance between the patterns 700 is large, so that the effect of crack formation, that is, the effect of increasing the actual permeability, may deteriorate. When the pattern 700 includes the rim 730, the effect of crack formation is further enhanced, the boundaries between the patterns 700 are clearly distinguished, and the repetitive pattern aspect becomes clear, so that the uniformity of the quality can be further increased.

11, the pattern 700 may include six or more lines 720 emanating from a predetermined point 710 and a rim 730 surrounding it. When six or more lines 720 are formed in the rim 730, the effect of crack formation can be maximized.

12 shows a top view of a soft magnetic layer according to another embodiment of the present invention.

Referring to FIG. 12, a pattern 700 is formed on the soft magnetic layer 210, including three or more lines 720 emitted from a predetermined point 710 and a frame 730 surrounding two or more lines 720. Here, the pattern may be formed as a crack. At this time, a plurality of patterns 700 may be repeatedly formed in the soft magnetic layer 210, and one pattern 700 may be arranged so as to be surrounded by a plurality of patterns, for example, three to eight patterns 700 .

Thus, when a repetitive pattern is formed in the soft magnetic layer 210, the eddy current loss can be reduced and a uniform and predictable transmission efficiency can be obtained.

At this time, the average diameter of each pattern 700 may be 50 탆 to 600 탆. If the diameter of the pattern 700 is less than 50 mu m, metal particles may be formed on the surface of the metal ribbon at the time of crack formation. In the case where metal particles are present on the surface of the soft magnetic layer 210, there is a risk of circuit shorting because metal particles may penetrate into the circuit. On the other hand, when the diameter of the pattern 700 exceeds 600 mu m, the distance between the patterns 700 is large, so that the effect of crack formation, that is, the effect of increasing the actual permeability, may deteriorate.

According to the embodiment of the present invention, it is possible to pressurize by using a urethane roller protruding in a pattern shape in order to form a crack of a uniform pattern on the metal ribbon. The urethane roller can uniformly form a crack pattern as compared with the roller made of a metal material, and the phenomenon that the metal particles remain on the surface of the metal ribbon can be minimized. At this time, the pressing process can be performed at 25 to 200 DEG C under 10 to 3000 Pa for 10 minutes or less.

As described above, by using the metal ribbon in which a repetitive pattern of cracks is formed in the soft magnetic layer of the wireless power receiving apparatus, permeability and saturation magnetization can be increased, and eddy current loss can be reduced. In addition, by forming a uniform pattern of cracks in the metal ribbon, the transmission efficiency can be increased and a uniform and predictable performance can be obtained.

Table 1 is a table comparing the performance of the transmission efficiency of a wireless power transmission system when a metal ribbon in which cracks are randomly formed is used as a soft magnetic layer and a metal ribbon in which a crack is formed in a repetitive pattern is used as a soft magnetic layer. Here, the metal ribbon is a nanocrystalline metal ribbon containing Fe. FIG. 13 shows a metal ribbon having a random crack used in Comparative Example 1, FIG. 14 shows a metal ribbon in which a cross-shaped crack used in Example 1 is repeatedly formed, FIG. FIG. 16 is a view showing a metal ribbon in which cracks repeatedly formed in a star shape (eight lines radiated from a predetermined point) surrounded by the rim used in Example 3 are repeatedly formed, Represents a ribbon.

No. Pattern shape Transmission Efficiency (@ 3W) Transmission Efficiency (@ 5w) Metal particles Comparative Example 1 Random shape 68% 69.9% O Example 1 Cross shape 68% 70.1% X Example 2 Cross shape surrounded by a rim 68.2% 69.9% X Example 3 A star shape surrounded by a rim 69.9% 71.7% X

Referring to Table 1 and FIGS. 13 to 16, it can be seen that the metal ribbon having a crack formed in a regularly repeated pattern has a higher transmission efficiency than a metal ribbon in which a crack is formed in a random shape. Particularly, as in Embodiment 3, it can be seen that the pattern has the highest transmission efficiency when it includes at least six lines radiating from a predetermined point and a border surrounding it, that is, a star shape surrounded by a border. As shown in Table 1, the cracking effect of the repeated pattern can be more advantageous at high power. This is because the intensity of the magnetic field increases with the increase of the amount of current, and the metal ribbon of the receiving part is more affected by the magnetic field as the magnetic field increases.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

1100 Transmitter AC / DC converter section
1110 Rectifier
1120 Transmission side DC / DC converter unit
1200 transmission side DC / AC conversion unit
1300 transmitting side impedance matching unit
1400 transmit coil part
1500 Transmitting side communication and control unit
1510 Transmission side control section
1520 transmission side communication unit
2000 receiver
2100 Receiver side coil part
2200 receiving impedance matching unit
2300 receiving AC / DC converter
2400 receiving side DC / DC converting section
2500 Load section
2600 Receive side communication and control unit
2610 Receiving-
2620 Receiving side communication unit
100 wireless power transmitter
200 wireless power receiver
700 pattern

Claims (26)

Board; And
And a soft magnetic layer disposed on the substrate,
Wherein the soft magnetic layer includes an Fe-based metal ribbon in which a crack pattern is formed,
In the crack pattern,
Center pattern; And
And a plurality of neighboring patterns disposed adjacent to the center pattern,
Wherein each of the center pattern and the plurality of neighboring patterns comprises:
At least six radiation emitted from a given center point; And
And a rim surrounding said radiation,
The central points of the center pattern and the plurality of neighboring patterns are spaced apart from each other by a predetermined rule,
Wherein the plurality of neighboring patterns comprises:
A first pattern and a second pattern arranged along a first direction about the center pattern;
A third pattern and a fourth pattern arranged along a second direction intersecting the first direction about the center pattern; And
A fifth pattern and a sixth pattern formed between the first direction and the second direction around the center pattern and arranged in a third direction intersecting the first direction and the second direction,
The distance between the center point of the center pattern and the center point of the first pattern and the distance between the center point of the center pattern and the center point of the third pattern are smaller than the distance between the center point of the center pattern and the center point of the fifth pattern,
Wherein a part of the rim of the center pattern includes a cut-off section. The method according to claim 1,
The center pattern may be formed,
A first region formed by the first radiation and the second radiation which are adjacent to each other among the plurality of radiation;
A second region formed by the third radiation adjacent to the second radiation;
A third region formed by the fourth radiation adjacent to the third radiation;
A fourth region formed by the fifth radiation adjacent to the fourth radiation; And
A fifth region formed by the sixth radiation adjacent to the fifth radiation;
/ RTI >
The rim portion of the center pattern includes a plurality of frame lines,
Wherein the plurality of frame lines
A first border line surrounding a portion of the first region; And
And a second border line surrounding a portion of the second region and extending from the first border line,
And the cut-off section is formed in the third region. 3. The method of claim 2,
Wherein at least one of the plurality of rays of the central pattern is not connected to the rim of the center pattern. 3. The method of claim 2,
The center pattern
Wherein the first radiation and the neighboring second radiation form an acute angle,
Wherein the third radiation adjacent to the second radiation forms an acute angle,
The fourth radiation adjacent to the third radiation forms an acute angle,
The fifth radiation adjacent to the fourth radiation forms an acute angle,
And the sixth radiation adjacent to the fifth radiation forms an acute angle. The method according to claim 1,
Wherein the rim of the center pattern includes a circular shape. 5. The method of claim 4,
Further comprising a plurality of radial rays emitted from the center point of the center pattern between the fifth region and the first region. The method according to claim 1,
Wherein a distance between two predetermined points facing each other of the rim portion contacting with a virtual straight line passing through the center point of the center pattern is 50 占 퐉 to 600 占 퐉. The method according to claim 1,
Wherein the soft magnetic layer has a thickness of 0.01 mm to 0.04 mm. The method according to claim 1,
Wherein some of the rim portions of the plurality of neighboring patterns include at least one discontinuous section. The method according to claim 1,
And a seventh pattern and an eighth pattern formed between the first direction and the second direction around the center pattern and arranged in a fourth direction intersecting the third direction. 11. The method of claim 10,
Wherein a distance between a center point of the center pattern and a center point of the second pattern and a distance between a center point of the center pattern and a center point of the fourth pattern are smaller than a distance between a center point of the center pattern and a center point of the seventh pattern, . Board; And
And a soft magnetic layer disposed on the substrate,
Wherein the soft magnetic layer includes an Fe-based metal ribbon in which a crack pattern is formed,
In the crack pattern,
Center pattern; And
And a plurality of neighboring patterns disposed adjacent to the center pattern,
Wherein each of the center pattern and the plurality of neighboring patterns comprises:
At least six radiation emitted from a given center point; And
And a rim surrounding said radiation,
The central points of the center pattern and the plurality of neighboring patterns are spaced apart from each other by a predetermined rule,
Wherein the plurality of neighboring patterns comprises:
A first pattern and a second pattern arranged along a first direction about the center pattern;
A third pattern and a fourth pattern arranged along a second direction intersecting the first direction about the center pattern; And
A fifth pattern and a sixth pattern formed between the first direction and the second direction around the center pattern and arranged in a third direction intersecting the first direction and the second direction,
The distance between the center point of the center pattern and the center point of the first pattern and the distance between the center point of the center pattern and the center point of the third pattern are smaller than the distance between the center point of the center pattern and the center point of the fifth pattern,
And a region spaced apart from each other between a rim of the center pattern and a rim of the plurality of neighboring patterns,
The rim portion of the center pattern includes a plurality of frame lines,
Wherein at least one of the plurality of edge lines includes an interruption period that is not connected to another adjacent edge line. 13. The method of claim 12,
The center pattern may be formed,
A first region formed by the first radiation and the second radiation which are adjacent to each other among the plurality of radiation;
A second region formed by the third radiation adjacent to the second radiation;
A third region formed by the fourth radiation adjacent to the third radiation;
A fourth region formed by the fifth radiation adjacent to the fourth radiation; And
A fifth region formed by the sixth radiation adjacent to the fifth radiation;
/ RTI >
Wherein a plurality of frame lines of the central pattern
A first edge line surrounding at least a part of the first area and being closest to the center point of the center pattern; And
And a second border line surrounding at least a part of the second region and extending from the first border line and closest to the center point of the center pattern,
And the cut-off section is formed in the third region. 14. The method of claim 13,
A third border line surrounding at least a portion of the third region and being closest to the center point of the center pattern; And
And a fourth border line surrounding at least a part of the fourth region and being closest to the center point of the center pattern. 15. The method of claim 14,
Wherein the third border line extends from the second border line,
And the third edge line and the fourth edge line are spaced apart from each other. 16. The method of claim 15,
An end point of the first frame line and a start point of the second frame line are directly connected to each other,
An end point of the second frame line and a start point of the third frame line are directly connected to each other,
And an end point of the third edge line and a start point of the fourth edge line are spaced apart from each other. 13. The method of claim 12,
Wherein at least one of the plurality of rays of the central pattern is not connected to the rim of the center pattern. 13. The method of claim 12,
Wherein the rim of the center pattern includes a circular shape. 14. The method of claim 13,
Further comprising a plurality of radial rays emitted from the center point of the center pattern between the fifth region and the first region. 14. The method of claim 13,
Wherein a distance between two predetermined points facing each other of the rim portion contacting with a virtual straight line passing through the center point of the center pattern is 50 占 퐉 to 600 占 퐉. 14. The method of claim 13,
Wherein some of the rim portions of the plurality of neighboring patterns include at least one discontinuous section. 13. The method of claim 12,
And a seventh pattern and an eighth pattern formed between the first direction and the second direction around the center pattern and arranged in a fourth direction intersecting the third direction. 23. The method of claim 22,
Wherein a distance between a center point of the center pattern and a center point of the second pattern and a distance between a center point of the center pattern and a center point of the fourth pattern are smaller than a distance between a center point of the center pattern and a center point of the seventh pattern, . Board;
A soft magnetic layer disposed on the substrate; And
And a coil disposed on the soft magnetic layer,
Wherein the soft magnetic layer includes an Fe-based metal ribbon in which a crack pattern is formed,
In the crack pattern,
Center pattern; And
And a plurality of neighboring patterns disposed adjacent to the center pattern,
Wherein each of the center pattern and the plurality of neighboring patterns comprises:
At least six radiation emitted from a given center point; And
And a rim surrounding said radiation,
The central points of the center pattern and the plurality of neighboring patterns are spaced apart from each other by a predetermined rule,
Wherein the plurality of neighboring patterns comprises:
A first pattern and a second pattern arranged along a first direction about the center pattern;
A third pattern and a fourth pattern arranged along a second direction intersecting the first direction about the center pattern; And
A fifth pattern and a sixth pattern formed between the first direction and the second direction around the center pattern and arranged in a third direction intersecting the first direction and the second direction,
The distance between the center point of the center pattern and the center point of the first pattern and the distance between the center point of the center pattern and the center point of the third pattern are smaller than the distance between the center point of the center pattern and the center point of the fifth pattern,
Wherein a part of the rim of the center pattern includes a cut-off period. 25. The method of claim 24,
Wherein:
A first coil; And
And a second coil,
And the second coil is disposed so as to surround the outside of the first coil. 26. The method of claim 25,
Wherein the first coil includes a wireless charging coil,
And the second coil includes a coil for short-range communication.

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