KR20120133573A - Core assembly for wireless power transmission, power supplying apparatus for wireless power transmission having the same, and method for manufacturing core assembly for wireless power transmission - Google Patents

Abstract

PURPOSE: A core assembly for wireless power communication, a power supply device for wireless power communication including the same, and a manufacturing method of the core assembly are provided to minimize the leakage of magnetic flux generated in a coil through a core. CONSTITUTION: A core assembly includes a plurality of coils(110), a plate core(120), and a circuit board(130). The coil is wound. Recess parts(122,123) are formed on the front of the core to receive the coil. The recess part is limited by a protruded side wall(126) surrounding the recess part. Multiple extension grooves(124a,124b,125a,125b) are formed to connect the recess part of the side wall to the outside.

Description

CORE ASSEMBLY FOR WIRELESS POWER TRANSMISSION, POWER SUPPLYING APPARATUS FOR WIRELESS POWER TRANSMISSION HAVING THE SAME, AND METHOD FOR MANUFACTURING CORE ASSEMBLY FOR WIRELESS POWER TRANSMISSION}

The present invention relates to a core assembly for wireless power communication, a power supply for wireless power communication having the same, and a method for manufacturing a core assembly for wireless power communication.

Generally, portable electronic devices such as mobile communication terminals, PDAs (Personal Digital Assistants), and the like are equipped with rechargeable secondary batteries as batteries. In order to charge the battery, a separate charging device for providing electrical energy to the battery of the portable electronic device using a domestic commercial power source is required.

Typically, a separate contact terminal is configured on the outside of the charging device and the battery, thereby electrically connecting the charging device and the battery by connecting the two contact terminals to each other. However, if the contact terminal protrudes to the outside as described above, the appearance is not good, and the contact terminal is contaminated with foreign matter, and the contact state is easily deteriorated easily. In addition, when the battery is inadvertently shorted or exposed to moisture, the charging energy may be easily lost.

As an alternative to the contact charging method, a wireless power communication system has been proposed in which power transmission is wireless so that the battery is charged in such a manner that the contact terminals of the charging device and the battery do not contact each other.

An object of the present invention is to provide a core assembly for wireless power communication, a power supply for wireless power communication having the same, and a method for manufacturing a core assembly for wireless power communication, which can minimize leakage of magnetic flux generated in a coil through a core. .

Core assembly for a wireless power communication according to an embodiment of the present invention for realizing the above object, the core is formed of a magnetic body, a plurality of extension grooves are formed in the side wall defining the recess; A plurality of wound coils accommodated in the concave portion and disposed such that respective portions overlap each other; And a circuit board disposed to face the rear surface of the core, wherein both ends of each of the plurality of coils extend out of the core through the plurality of extension grooves.

Here, the recessed portion, the first recessed portion having a first depth; And a second recess formed in communication with the first recess and having a second depth smaller than the first depth.

Here, the concave portion may be formed to have a closed curve outline, and the contour of the first concave portion may be formed to form another closed curve inscribed to a portion of the contour of the concave portion.

Here, the part which meets the said 2nd recessed part of a said 1st recessed part may be a 1st contour wall; And a second contour wall extending from the first contour wall and formed to have a radius larger than that of the first contour wall.

Here, the contour lines may be formed to form an ellipse, respectively.

Here, the concave portion may be formed in a size such that the outer circumference formed by the plurality of overlapping coils contacts the inner surface of the side wall.

Here, the plurality of coils may be an elliptical coil having a hollow part.

Here, the plurality of coils may include first and second coils having the same outer size, and the hollow portion of the first coil may be larger than the hollow portion of the second coil.

Here, two supports protruding from the recess are further provided, and the first support inserted into the hollow portion of the first coil has a larger cross-sectional area than the second support inserted into the hollow portion of the second coil. Can be formed.

Here, at least one section of the cross section of the support may be formed in a curved shape so as to contact one section of the inner circumferential surface of the hollow part of the coil.

The plurality of extension grooves may include a pair of first extension grooves corresponding to both ends of the first coil; And a pair of second extension grooves corresponding to both ends of the second coil, wherein the circuit board includes the first coil and the second coil at a position corresponding to the first extension groove and the second extension groove. Four through holes into which both ends of each coil are inserted may be formed.

Here, the circuit board may have a rectangular shape having a pair of long sides, and the four through holes may be disposed in pairs along each of the pair of long sides of the circuit board.

Here, a plurality of connection parts may be further provided to correspond to the number of both ends on the opposite side of the surface facing the core of the circuit board so that both ends of each of the coils are connected.

Here, a groove may be further provided on the bottom of the recess to accommodate a portion in contact with the bottom of the coil.

In accordance with another aspect of the present invention, there is provided a wireless power communication power supply apparatus including: a core assembly for wireless power communication configured as described above and having a charging power supply circuit formed on the circuit board; And a housing formed to surround the core assembly.

In accordance with still another aspect of the present invention, there is provided a method for manufacturing a core assembly for wireless power communication, the method including: forming a mixture by adding a binder to a magnetic powder; Inserting the mixture into a mold and pressing the mold to form a core having a recess formed on one surface thereof and a plurality of extension grooves formed on a side wall defining the recess; Sintering the shaped core; Disposing portions of the plurality of coils wound on the concave portions of the sintered core so as to overlap each other; And drawing both ends of each of the coils out of the core through the plurality of extension grooves and connecting them to the circuit board.

Here, the powder may include manganese-zinc.

Here, the step of sintering the molded core may include maintaining a sintering temperature at 60 ℃ to 80 ℃.

According to the wireless power communication core assembly, the wireless power communication power supply apparatus having the same, and the wireless power communication core assembly manufacturing method according to the present invention configured as described above, the magnetic flux generated in the coil for the extension of both ends of the coil of the core Minimize leakage through the structure. This makes it possible to lower the possibility that the wireless power communication efficiency of the core assembly for wireless power communication (and the power supply for wireless power communication) is lowered. In addition, since the magnetic flux generated in the coil leaks to reduce the possibility of affecting the circuit board, the possibility of stable operation of the control circuit formed on the circuit board is increased.

1 is a schematic perspective view of a wireless power communication system in accordance with the present invention.
2 is an internal functional block diagram of the wireless power communication system of FIG.
3 is an assembled perspective view of the core assembly for wireless power communication according to an embodiment of the present invention viewed from the front.
4 is an assembled perspective view of the wireless power communication assembly of FIG.
5 is an exploded perspective view of the assembly for wireless power communication of FIG. 3.
FIG. 6 is a perspective view illustrating the core 120 ′ according to a modification of the core 120 of FIG. 3.
FIG. 7 is a partial conceptual view illustrating a state in which the coil 111 is seated on the core 120 ′ of FIG. 6.
8 is a flowchart illustrating a manufacturing method for a core assembly for wireless power communication according to another embodiment of the present invention.

Hereinafter, a wireless power communication core assembly according to a preferred embodiment of the present invention, a wireless power communication power supply apparatus having the same, and a method for manufacturing the wireless power communication core assembly will be described in detail with reference to the accompanying drawings. In the present specification, different embodiments are given the same or similar reference numerals for the same or similar configurations, and the description is replaced with the first description.

1 is a schematic perspective view of a wireless power communication system in accordance with the present invention.

As shown in the figure, the wireless power communication system includes a power supply device 100 and a power receiver 200 that is wirelessly powered from the power supply device 100 to charge the battery.

The power supply device 100 receives electric energy from an external power source and generates charging power to be supplied to the power receiver 200. The power supply device 100 may be formed in a pad shape so that the power receiving device 200 can be easily seated. As an external power source supplied to the power supply device 100, a commercial AC power source (60 Hz, 220 V / 100 V) or a DC power source may be employed.

The power receiver 200 includes a battery pack in which a battery is built or a portable electronic device in which a battery is built. In addition, the power receiver 200 may be a part of a portable electronic device connected to the battery, or may be a member connected to the battery separately from the portable electronic device. Examples of portable electronic devices include cellular phones, PDAs, and MP3 players. The battery may include a lithium ion battery, a lithium polymer battery, or the like as a rechargeable battery cell.

The power supply device 100 and the power receiver 200 may include a primary coil 110 and a secondary coil 210 corresponding to each other. The primary and secondary coils 110 and 210 are magnetically coupled to each other by inductive coupling. Thus, as the secondary coil 210 is juxtaposed over the primary coil 110, the magnetic field generated by the primary coil 110 induces an induced current in the secondary coil 210.

The power supply device 100 includes a charging power supply circuit 150 (see FIG. 2) for driving the primary coil 110 to generate a magnetic field. The power receiver 200 includes a charging circuit 250 (see FIG. 2) for charging a battery by using induced electromotive force induced by the secondary coil 210.

Hereinafter, referring to FIG. 2, a detailed configuration of the charging power supply circuit 150 and the charging circuit 250 will be described. 2 is an internal functional block diagram of the wireless power communication system of FIG.

Referring to this figure, the charging power supply circuit 150 embedded in the power supply device 100, the primary coil 110, the rectifier 152, the drive circuit 153, the controller 155, the wireless receiving module 156 may include.

The rectifier 152 rectifies the AC voltage from the commercial AC power supply 151 to DC, and then transfers the rectified voltage to the driving circuit 153. The driving circuit 153 generates a high frequency AC voltage pulse of a commercial frequency or more using the DC voltage rectified by the rectifier 152, and applies the same to the primary coil 110 to generate a magnetic field.

The driving circuit 153 may include a power driver 154a and a pulse width modulation (PWM) signal generator 154b. The power driver 154a converts a DC voltage of a predetermined level to apply a high frequency oscillation circuit oscillating a high frequency AC voltage of a commercial frequency or higher, and applies a pulse width modulated high frequency AC voltage pulse to the primary coil 110 by 1. It may include a drive circuit for driving the difference coil 110. The PWM signal generator 154b performs pulse width modulation (PWM) on the high frequency AC voltage. As a result, the output signal discharged through the output terminal of the power driver 153 becomes a high frequency AC voltage pulse. This high frequency AC voltage pulse becomes a pulse train, and the pulse width of the pulse train can be adjusted by the controller 155. As the above driving circuit 153, for example, a switching mode power supply (SMPS) may be adopted.

The controller 155 adjusts the pulse width of the pulse-width modulated high frequency AC voltage pulse based on the charging state information of the battery fed back via the wireless transmission and reception modules 156 and 256. For example, when the response signal fed back from the charging circuit 250 is the charging start signal, the controller 155 switches the driving mode of the primary coil 110 from the standby mode to the charging mode. In addition, as a result of analyzing the charging state information fed back from the charging circuit 250, if it is determined that the battery is fully charged, the driving mode of the primary coil 110 is switched from the charging mode to the buffer mode. When there is no response signal fed back from the charging circuit 250, the controller 155 maintains the driving mode of the primary coil 110 in the standby mode.

The wireless reception module 156 demodulates the feedback response signal as the coil 110 receives a feedback response signal transmitted from the wireless transmission module 256 of the charging circuit 250 to charge state information of the battery 262. Receiving unit 156, such as a demodulator to restore the. The wireless reception module 156 may include an antenna for receiving a feedback response signal transmitted from the wireless transmission module 256 of the charging circuit 250 separately from the coil 110.

The charging power supply circuit 150 may further include an overvoltage filter circuit for protecting the circuit from overvoltage or a constant voltage circuit for maintaining the DC voltage rectified by the rectifier at a predetermined level. The overvoltage filter circuit may be disposed between the commercial AC power supply 151 and the rectifier 152, and the constant voltage circuit may be disposed between the rectifier 152 and the driving circuit 153.

Next, the charging circuit 250 that receives power from the charging power supply circuit 150 and charges the battery 262 will be described. The charging circuit 250 is built in the power receiver 200.

The charging circuit 250 may include a secondary coil 210, a rectifier 251, a constant voltage / constant current circuit 252, a polling detector 253, a controller 255, and a wireless transmission module 256.

The secondary coil 210 is magnetically coupled to the primary coil 110 to generate induced electromotive force. As described above, since the power signal applied to the primary coil 110 is a pulse width modulation signal, the organic electromotive force induced in the secondary coil 210 is also an AC voltage pulse train. In addition, the AC voltage pulse induced in the secondary coil 210 according to the driving mode of the primary coil 110 may also follow any one of a standby mode, a charging mode, and a buffer mode.

The rectifier 251 is connected to the output terminal of the secondary coil 210 to flatten the AC voltage pulse induced by the secondary coil 210 to a constant level of direct current. The constant voltage / constant current circuit 252 generates a constant voltage and a constant current to charge the battery 262 using a DC voltage of a predetermined level. Specifically, while maintaining the constant current mode at the time of initial charging of the battery 262, when the charging voltage of the battery 262 is saturated, it switches to the constant voltage mode.

The polling detector 253 is a device for detecting a falling time, that is, a falling time of the AC voltage pulse induced by the secondary coil 210. The polling detection signal is input to the controller 255.

The controller 255 is a kind of microprocessor and receives a monitoring signal such as a polling detection signal, a charging current, a charging voltage, and the like, and controls the constant voltage / constant current circuit 252 and the wireless transmission module 256 based on the monitoring signal. For example, the controller 255 grasps the falling time point of the pulse based on the polling detection signal input from the polling detector 253, and determines the transmission time of the feedback response signal to be transmitted to the charging power supply circuit 150. Synchronize at the time of descent. The controller 255 monitors the charging current and the charging voltage of the battery 262 and temporarily stores this monitoring value in an internal memory (not shown). The memory, not shown, may store battery 262 specification information (product code, rating, etc.) as well as battery 262 state of charge information such as monitored charge current and charge voltage.

In addition, the controller 255 appropriately selects and switches the constant voltage mode and the constant current mode according to the state of charge of the battery 262. The controller 255 monitors whether an excessive voltage is applied across the constant voltage / constant current circuit 252, and generates an adjustment request signal for charging power when the excessive voltage is applied. The adjustment request signal is fed back to the charging power supply circuit 150 on the power supply device 100 via the wireless transmission module 256.

The monitoring operation for the voltage across the constant voltage / constant current circuit 252 is performed by measuring the front end voltage and the back end voltage of the constant voltage / constant current circuit 252 and checking whether the difference exceeds the reference value. The wireless transmission module 256 transmits a feedback response signal (charging start signal, charging state signal, adjustment request signal) to be transmitted to the charging power supply circuit 150 by the coil 210, and a baseband signal such as charging state information. And a transmitter 256 to modulate the to generate a feedback response signal. The wireless reception module 256 may include an antenna for transmitting a feedback response signal to be transmitted to the charging power supply circuit 150 separately from the coil 210.

A protective circuit (PCM) 261 is disposed between the constant voltage / constant current circuit 252 and the battery 262 to prevent the application of overvoltage or overcurrent to the battery 262. The protection circuit 261 and the battery 262 may constitute one battery unit 260.

Hereinafter, the power supply device 100 will be described in more detail.

3 is an assembled perspective view of the core assembly for wireless power communication according to an embodiment of the present invention viewed from the front.

The power supply device 100 according to an embodiment of the present invention includes a core assembly to be described with reference to the drawings and the like, and a housing (see FIG. 1) surrounding the core assembly to form an exterior.

The core assembly may include a plurality of coils 110, a plate-shaped core 120, and a circuit board 130.

The coil 110 has two free ends and is formed in a wound form. The coil 110 is also provided in plurality. Adjacent coils 110 among the plurality of coils are disposed such that portions overlap each other. In this embodiment, the form in which the two coils 110 are partially overlapped is illustrated.

The core 120 may be formed in a plate shape. In this embodiment, the core 120 is illustrated as forming a generally cuboid. Specifically, four corners of a rectangular parallelepiped form a rounded shape. In the wide surface of the core 120, that is, the front surface 121 of the main surface, concave portions 122 and 123 for accommodating the coil 110 are formed. Concave portions 122 and 123 are defined by sidewalls 126 that protrude to surround them. The side wall 126 is formed with a plurality of extension grooves 124a, 124b, 125a, and 125b for communicating the recesses 122 and 123 with the outside. Both ends of the coil 110 extend through the extension grooves 124a, 124b, 125a, and 125b, respectively. The core 120 is formed of a magnetic material, thereby reducing the possibility of the magnetic field caused by the current flowing in the coil 110 accommodated in the concave portions 122 and 123 deviating from the direction toward the power receiver 200 (FIG. 1).

The circuit board 130 is positioned below the core 120 so as to face the back surface of the core 120 (the surface opposite to the front surface 121). A portion of the circuit board 130 supports the core 120 from below. Another part of the circuit board 130 includes a circuit for controlling the application of power to the coil 110. The control circuit includes the charging power control circuit 150 (FIG. 2) described above.

4 is an assembled perspective view of the wireless power communication assembly of FIG.

Referring to this drawing, both ends of each of the coils 110 extend through the circuit board 130 through the extension grooves 124a, 124b, 125a, and 125b to the outside of the core 12O (see FIG. 3 above). Done. In detail, both ends of the coil 110 pass through the through holes 134 and 135 formed in the circuit board 130. Here, both ends of the coil 110 are connected to the connection portions 138 adjacent to the through holes 134 and 135, and are formed to surround the through holes 134 and 135 in this drawing. In the above description, the through holes 134 and 135 penetrate from the upper surface 131 to the lower surface 132 of the circuit board 130, and the connection part 138 is formed on the lower surface 132.

A plurality of conductive patterns 139 are formed on the bottom surface 132 of the circuit board 130. The conductive pattern 139 is formed to extend from one portion 130b of the circuit board 130 toward the other portion 130a. One connection portion 138 is connected to one conductive pattern 139. As a result, the charging power control circuit 150 (FIG. 2) formed in the other portion 130a is electrically connected to the coil 110 to control the coil 110.

The circuit board 130 is formed in a generally rectangular shape and has a pair of long sides 132a and 132b. In this case, the pair of through holes 134 are placed in the lower region with respect to the center line of the circuit board 130. The other pair of through holes 135 is placed in the upper region with respect to the center line. In other words, the pair of through holes 135 is disposed along one long side 132a and the other pair of through holes 134 is disposed along another long side 132b. As a result, the conductive patterns 139 connected to the connection part 138 may also be formed in different regions.

5 is an exploded perspective view of the assembly of FIG. 3.

Referring to this figure, the coil 110 may be composed of a pair of coils, that is, the first coil 111 and the second coil 112.

The first coil 111 and the second coil 112 may be formed in an elliptical shape. This is to maximize the area where the first coil 111 and the second coil 112 overlap, but also to maximize the length of the longitudinal direction occupied by the overlapping first coil 111 and the second coil 112.

The first coil 111 and the second coil 112 may be wound to have substantially the same outer size. The first coil 111 and the second coil 112 are wound to form one plane, respectively. Planes formed by the first coil 111 and the second coil 112 may be disposed in parallel to each other (see FIG. 3).

Hollow portions 111 ′ and 112 ′ may be formed in the first coil 111 and the second coil 112, respectively. The areas of the hollow parts 111 ′ and 112 ′ may be adjusted by the degree of winding of the coils 111 and 112.

In this embodiment, the hollow part 111 ′ of the first coil 111 is larger than the hollow part 112 ′ of the second coil 112. The larger hollow portion 111 ′ of the first coil 111 means that the number of turns of the first coil 111 is smaller than the number of turns of the second coil 112. This affects the inductance of the first coil 111, and as a result, the resonance frequency (resonance frequency of the first coil 111 and the second coil 112 located at different heights, respectively, is inversely proportional to the square root of the inductance. Is associated with the same. By making the resonant frequencies of both coils 111 and 112 the same, there is an advantage that the control of the coils 111 and 112 becomes easier.

As described above, the core 120 has a generally rectangular parallelepiped shape. The front surface 121 of the core 120 is formed with recesses 122 and 123 for receiving the coil 110. The recesses 122 and 123 may include a first recess 122 recessed to a first depth and a second recess 123 recessed to a second depth. In the present embodiment, the first coil 111 is accommodated in the first recess 122 and the second coil 112 is received in the second recess 123. At this time, since the first coil 111 is located below the second coil 112, the first depth is deeper than the second depth.

Referring to the drawing again, the recesses 122 and 123 are recessed and formed to have a closed curve, specifically, an elliptical outline. If all of the recesses 122 and 123 form a large elliptical contour, the first recess 122 will form a contour such as a small ellipse inscribed in the large ellipse. As a result, if the first concave portion 122 forms an intact ellipse shape as a whole, the second concave portion 123 generally has a crescent like shape.

Contour walls 122 ′ and 122 ″ are formed at portions where the first recess 122 and the second recess 123 meet. Contour walls 122 ′ and 122 ″ generally have an arc shape. Compared to the first contour wall 122 ', the second contour wall 122 " is formed to have a larger radius. In this case, the radius of the first contour wall 122' and the second contour wall 122 " One end 122b of the second coil 112 is disposed in the corresponding region 129 '. This causes the end 122b to pass below and not above the wound portion of the second coil 112 such that the overall thickness of the core assembly is not increased by the end 122b. Here, the upper region 129 ′ may be formed to be recessed to the same depth as the first recess 122.

The sizes of the recesses 122 and 123 may be such that the outer circumference of the assembly in which the first coil 111 and the second coil 112 partially overlapped with each other is formed to be somewhat tightly received. As a result, the first coil 111 and the second coil 112 may be maintained at a predetermined position in the power supply device 100 only by being accommodated in the recesses 122 and 123. The recesses 122 and 123 have sidewalls 126 and a bottom 129 in shape thereof.

The side walls 126 have a height corresponding to the depth in which the recesses 122 and 123 are recessed. The side wall 126 may have a size corresponding to the thickness of the coil 110, and may be formed to block or mitigate leakage of the magnetic field generated in the coil 110 in the direction toward the side wall 126. As described above, the inner surface of the side wall 126 is in contact with the outer circumference of the coil 110 that is tightly received so that the coil 110 may be seated at a predetermined position. In addition, the side walls 126 are formed with a plurality of extension grooves 124a, 124b, 125a, and 125b for communicating the concave portions 122 and 123 with the outside. The pair of extension grooves 124a and 124b are formed at positions corresponding to both ends 111a and 11b of the first coil 111, and the other pair of extension grooves 125a and 125b are the second coil 112. Are formed at positions corresponding to both ends 112a and 112b.

Supports 127 and 128 may protrude from the bottom 129 of the recesses 122 and 123. The supports 127 and 128 are respectively formed at positions that can be inserted into the hollow portions 111 ′ of the first coil 111 or inserted into the hollow portions 112 ′ of the second coil 112. Thereby, the supports 127 and 128 are not separated from the set position of the first coil 111 or the second coil 112, so that the arrangement relationship therebetween can be maintained as set.

The shapes of the supports 127 and 128 may correspond to the shapes of the inner circumferential surfaces of the hollow parts 111 ′ and 112 ′ of the coil 110. In this embodiment, the outer circumference of the supports 127 and 128 has a curved section, corresponding to the inner circumferential surfaces of the curved hollow portions 111 'and 112'. Opposite sides of the curved sections of the supports 127 and 128 may be treated as straight sections to secure space for avoiding interference with the outer circumference of the coil 110. Thereby, the supports 127 and 128 can be projections extending with a semi-circular cross section as a whole. In this case, the cross-sectional area of the first support 127 inserted into the first hollow part 111 ′ may be larger than the cross-sectional area of the second support 128 inserted into the second hollow part 112 ′.

The upper surface 131 of the circuit board 130 is disposed to face the back surface (opposite surface of the front surface 121) of the core 120. The through holes 134 and 135 corresponding to the extension grooves 124a, 124b, 125a and 125b are formed along the long sides 132a and 132b of the circuit board 130.

According to this structure, the 1st coil 111 is put in the 1st recessed part 122 with the hollow part 111 'fitted in the 1st support 127. As shown in FIG. Similarly, the second coil 12 is placed in the second recess 123 with its hollow portion 112 ′ fitted in the second support 128. As a result, the first coil 111 and the second coil 112 are in a state where they partially overlap each other.

Both ends 111a and 111b of the first coil 111 extend out of the core 12O through the extension grooves 124a and 124b, respectively, and are inserted into the through holes 134 to surround the through holes 134 ( 138). At this time, one end 111a of the first coil 111 extends over the remaining wound portion of the first coil 111, but the depth of the first recess 122 is deeper than the first recess 123. Does not increase the overall thickness of the core assembly. The other end 111b extends horizontally into the groove 124b at the edge of the wound portion of the coil.

Both ends 112a and 112b of the second coil 112 extend out of the core 12O through the extension grooves 125a and 125b, respectively, and are inserted into the through holes 135 to surround the through holes 135. 138). At this time, one end 112a of the second coil 112 extends horizontally from the edge of the wound portion of the coil to the extension groove 125a. In addition, the other end 112b extends overlapping the wound portion of the coil, but extends through the recessed region 129 'to have the same depth as the first recess 122 to extend the extension groove 125b. As it exits through, it does not increase the overall thickness of the core assembly.

As described above, the coil 110 is placed in the concave portions 122 and 123, and their ends 111a, 111b, 112a, and 112b also face the sidewall 126 through the extension grooves 124a, 124b, 125a, and 125b. Since it is extended, the leakage of the magnetic flux generated in the coil 110 can be minimized.

6 is a perspective view illustrating a core 120 ′ according to a modified example of the core 120 of FIG. 3, and FIG. 7 is a partial conceptual view illustrating a coil 111 seated on the core 120 ′ of FIG. 6. to be.

Referring to FIG. 6, grooves 120a may be formed in the recesses 122 and 123 along the winding direction of the coils 111 and 112 (see FIG. 3) in the core 120 ′. In this drawing, not only the first recess 122 but also the second recess 123 is provided with a groove 120a. However, the grooves 120a may not necessarily be formed in all the recesses 122 and 123.

Referring to FIG. 7, coils 111 and 112 may be seated in the groove 120a. Thereby, the groove 120a, along with the supports 127 and 128 (FIG. 5), can help maintain the coils 111 and 112 in position.

In addition, since the coils 111 and 112 are seated on the grooves 120a, copper losses of the coils 111 and 112 may be reduced.

8 is a flowchart illustrating a method of manufacturing a core assembly for wireless power communication according to another embodiment of the present invention.

Referring to this figure, the above-described method for manufacturing a core assembly for wireless power communication may require fabrication of cores 120 and 120 '. In order to manufacture the cores 120 and 120 ', a powder and a binder are mixed to form a mixture (S1). In this case, the powder includes a material capable of making the cores 120 and 120 'magnetic. To this end, in this embodiment, the powder may comprise a manganese-zinc component.

The mixture should be shaped to have the form of cores 120, 120 '(S2). To this end, the mixture may be put into a mold and pressed to form a core (120, 120 '). By this pressing, the cores 120, 120 'will be shaped to have recesses 122, 123, sidewalls 126 having extension grooves 124a, 124b, 125a, 125b, and supports 127, 128.

The molded cores 120 and 120 'undergo a sintering process (S3). In the sintering process, the manganese-zinc powder may be kept at a low temperature, for example, 60 ° C. to 80 ° C.

Coils 110 are disposed in the recesses 122 and 123 of the sintered cores 120 and 120 '(S4).

Both ends of the coil 110 are connected to the bottom surface of the circuit board 130 via the extension grooves 124a, 124b, 125a, and 125b of the cores 12O and 120 'and through holes 134 and 135 of the circuit board 130. 138) (S5).

The core assembly for wireless power communication, the power supply apparatus for wireless power communication, and the method for manufacturing the core assembly for wireless power communication including the same are not limited to the configuration and operation of the embodiments described above. The above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.

100: power supply 110: primary coil
111: first coil 112: second coil
120, 120 ': core 122: first recessed portion
123: second recess 124a, 124b, 125a, 125b: extension groove
127,128: support 130: circuit board
134,135: through hole

Claims (18)

A core formed of one side of the magnetic body, and a plurality of extension grooves formed on sidewalls defining the recess;
A plurality of wound coils accommodated in the concave portion and disposed such that respective portions overlap each other; And
And a circuit board disposed to face the rear surface of the core, wherein both ends of each of the plurality of coils extend out of the core through the plurality of extension grooves and are connected to each other.
The method of claim 1,
The concave portion,
A first recess having a first depth; And
And a second recess, the second recess being formed in communication with the first recess and having a second depth smaller than the first depth.
The method of claim 2,
The concave portion is formed to have a closed curve outline,
The contour of the first concave portion is formed to form another closed curve inscribed to a portion of the contour of the concave portion, the core assembly for wireless power communication.
The method of claim 3,
The part which meets the said 2nd recessed part of a said 1st recessed part,
A first contour wall; And
And a second contour wall extending from the first contour wall and formed to have a radius larger than the first contour wall.
The method of claim 3,
The contours are each formed to form an ellipse, the core assembly for wireless power communication.
The method of claim 1,
The recess is formed in a size such that the outer periphery formed by the plurality of overlapping coils are in contact with the inner surface of the side wall, the core assembly for wireless power communication.
The method of claim 1,
The plurality of coils is an elliptical coil having a hollow portion, the core assembly for wireless power communication.
The method of claim 7, wherein
The plurality of coils may include first and second coils having the same outer size.
The hollow part of the first coil is formed larger than the hollow part of the second coil, the core assembly for wireless power communication.
9. The method of claim 8,
It includes two supports protruding from the recess,
The first support inserted into the hollow portion of the first coil is formed to have a larger cross-sectional area than the second support inserted into the hollow portion of the second coil, the core assembly for wireless power communication.
10. The method of claim 9,
At least one section of the cross section of the support is formed in a curved shape so as to be in contact with one section of the inner peripheral surface of the hollow portion of the coil, wireless power communication core assembly.
The method of claim 1,
The plurality of extension grooves,
A pair of first extension grooves corresponding to both ends of the first coil; And
A pair of second extension grooves corresponding to both ends of the second coil;
The circuit board has four through-holes in which both ends of each of the first coil and the second coil are inserted at positions corresponding to the first extension groove and the second extension groove.
The method of claim 11,
The circuit board has a rectangular shape having a pair of long sides,
The four through holes are arranged in pairs along each of the pair of long sides of the circuit board, the core assembly for wireless power communication.
The method of claim 11,
And a plurality of connection parts formed on opposite sides of the surface of the circuit board corresponding to the number of both ends so that both ends of each of the coils are connected to each other.
The method of claim 1,
The bottom surface of the concave portion is formed in the groove along the winding direction of the coil grooves are received, the core assembly for wireless power communication is formed.
The core assembly for wireless power communication according to any one of claims 1 to 14, wherein a charging power supply circuit is formed on the circuit board; And
And a housing formed to surround the core assembly.
Adding a binder to the magnetic powder to form a mixture;
Inserting the mixture into a mold and pressing the mold to form a core having a recess formed on one surface thereof and a plurality of extension grooves formed on a side wall defining the recess;
Sintering the shaped core;
Disposing portions of the plurality of coils wound on the concave portions of the sintered core so as to overlap each other; And
And drawing both ends of each of the coils out of the core through the plurality of extension grooves and connecting them to a circuit board.
The method of claim 16, wherein
Wherein the powder comprises manganese-zinc, wireless power communication core assembly manufacturing method.
18. The method of claim 17,
Sintering the molded core,
A method of manufacturing a core assembly for wireless power communication, the method comprising the step of maintaining a sintering temperature of 60 ℃ to 80 ℃.

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