KR20170068164A - Transmitting Coil Module Of Wireless Power Transmitter, And Method Of Manufacturing The Same - Google Patents

Abstract

The present invention relates to a wireless power transmission technology, and a transmission coil module of a wireless power transmitter according to an embodiment of the present invention includes a transmission coil for transmitting wireless power, and a transmission coil for preventing contact between adjacent transmission lines of the transmission coil And a coil receiving portion for receiving the at least one coil guide and the transmitting coil.

Description

Technical Field [0001] The present invention relates to a transmission coil module for a wireless power transmitter,

The present invention relates to wireless power transmission technology, and more particularly, to a transmission coil module of a wireless power transmitter and a method of fabricating the same.

Recently, as the information and communication technology rapidly develops, a ubiquitous society based on information and communication technology is being made.

In order for information communication devices to be connected anytime and anywhere, sensors equipped with a computer chip having a communication function must be installed in all facilities of the society. Therefore, power supply problems of these devices and sensors are becoming a new challenge. In addition, mobile devices such as Bluetooth handsets and iPods, as well as mobile phones, have been rapidly increasing in number, and charging the battery has required users time and effort. As a way to solve this problem, wireless power transmission technology has recently attracted attention.

The wireless power transmission technology (wireless power transmission or wireless energy transfer) is a technology to transmit electric energy from the transmitter to the receiver wirelessly using the induction principle of the magnetic field. In the 1800s, electric motor or transformer Thereafter, a method of transmitting electric energy by radiating an electromagnetic wave such as a radio wave or a laser was tried. Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.

Up to the present, energy transmission using radio may be roughly classified into a magnetic induction method, an electromagnetic resonance method, and an RF transmission method using a short wavelength radio frequency.

In the magnetic induction method, when two coils are adjacent to each other and a current is supplied to one coil, a magnetic flux generated at this time causes an electromotive force to the other coils. As a technology, . The magnetic induction method has the disadvantage that it can transmit power of up to several hundred kilowatts (kW) and the efficiency is high, but the maximum transmission distance is 1 centimeter (cm) or less, so it is usually adjacent to the charger or the floor.

The self-resonance method is characterized by using an electric field or a magnetic field instead of using electromagnetic waves or currents. The self-resonance method is advantageous in that it is safe to other electronic devices or human body since it is hardly influenced by the electromagnetic wave problem. On the other hand, it can be used only at a limited distance and space, and has a disadvantage that energy transfer efficiency is somewhat low.

Short wavelength wireless power transmission - simply, RF transmission - takes advantage of the fact that energy can be transmitted and received directly in radio wave form. This technology is a RF power transmission system using a rectenna. Rectena is a combination of an antenna and a rectifier, which means a device that converts RF power directly into direct current power. That is, the RF method is a technique of converting an AC radio wave into DC and using it. Recently, as the efficiency has improved, commercialization has been actively researched.

Wireless power transmission technology can be applied not only to mobile, but also to various industries such as IT, railroad, and household appliance industry.

Recently, wireless power transmitters with a plurality of coils have been introduced to increase the recognition rate of a wireless power receiver placed on a charging bed. Further, in order to increase the power transmission efficiency of the wireless power transmitter, it is required that the size of each of the plurality of coils and the thickness of the conductor constituting the coil are increased.

However, if the conductor thickness of the coil is increased, it is difficult to attach the film (PI film) for maintaining the shape of the coil, so that a short phenomenon in which adjacent conductors come into contact with each other may occur.

On the other hand, when it is difficult to attach the film to the coil for holding the shape, and when the coil is manufactured while being exposed to the outside, the possibility of contamination by foreign substances also increases.

It is an object of the present invention to provide a transmission coil module of a wireless power transmitter and a method of manufacturing the same.

Another object of the present invention is to provide a transmission coil module of a wireless power transmitter capable of preventing a short-circuit phenomenon and contamination by a foreign substance, and a method of manufacturing the same.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

A transmission coil module of a wireless power transmitter according to an embodiment of the present invention includes: a transmission coil for transmitting wireless power; And a guide board including at least one coil guide for preventing contact between adjacent ones of the transmission coils, and a coil receiving portion for receiving the transmission coil.

According to an embodiment, the at least one coil guide comprises a plurality of guide structures arranged perpendicular to the direction of the concentric circle of the transmitting coil, each of the plurality of guide structures being located between adjacent ones of the conductors .

According to an embodiment, the number of the plurality of guide structures may be equal to the number of times the transmission coil is wound.

According to an embodiment, an interval between adjacent guide structures of the plurality of guide structures may be equal to a diameter of a lead of the transmission coil.

According to an embodiment, the height of the coil receiving portion may be the same as the diameter of the lead wire of the transmitting coil.

The apparatus may further include a shielding member attached to a lower portion of the guide substrate to shield the magnetic field of the transmission coil.

A method of fabricating a transmit coil module of a wireless power transmitter according to an embodiment of the present invention includes at least one coil guide for preventing contact between adjacent conductors of a transmit coil for transmitting wireless power, Forming a guide substrate including a coil receiving portion to which a coil is inserted; And inserting the transmission coil into the coil receiving portion such that a lead of the transmission coil is inserted into the at least one coil guide.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And can be understood and understood.

The effect of the device according to the present invention will be described as follows.

According to the transmission coil module and the method for fabricating the same according to the embodiment of the present invention, a short circuit phenomenon can be prevented between the inner conductor and the outer conductor adjacent to each other of the transmission coil.

Further, the guide substrate protects the transmission coil, thereby preventing foreign matter from entering from the outside and contaminating the transmission coil.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 is a diagram for explaining a sensing signal transmission procedure in a wireless power transmitter according to an embodiment of the present invention.
2 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.
3 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard;
4 is a diagram for explaining an electromagnetic induction type wireless charging system according to an embodiment of the present invention.
5 is a front view of a transmission coil according to an embodiment of the present invention.
Fig. 6 is a view showing a guide substrate for receiving the transmission coil of Fig. 5;
7 is a view showing a state in which the transmission coil is mounted on the guide board of Fig.
8 is a view showing a coupling structure in which a transmission coil is mounted on the guide board shown in FIG. 7 in more detail.
9 is a cross-sectional view of the coupling structure shown in Fig.
10 is a view showing an embodiment of a transmission coil module having a shielding agent attached to a cross section of the coupling structure shown in FIG.
11 is a view showing another embodiment of a transmission coil module with a shielding agent attached to the end surface of the coupling structure shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

In the description of the embodiment, in the case where it is described as being formed "above" or "below" each element, the upper or lower (lower) And that at least one further component is formed and arranged between the two components. Also, in the case of "upper (upper) or lower (lower)", it may include not only an upward direction but also a downward direction based on one component.

In the description of the embodiments, an apparatus for transmitting wireless power on a wireless power system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmission device, a wireless power transmitter, and the like are used in combination. Also, for the sake of convenience of explanation, it is to be understood that a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a receiving terminal, a receiving side, a receiving apparatus, Etc. may be used in combination.

The transmitter according to the present invention may be configured as a pad type, a cradle type, an access point (AP) type, a small base type, a stand type, a ceiling embedded type, a wall type, Power can also be transmitted. To this end, the transmitter may comprise at least one radio power transmission means. Here, the radio power transmitting means may be various non-electric power transmission standards based on an electromagnetic induction method in which a magnetic field is generated in a power transmitting terminal coil and charged using an electromagnetic induction principle in which electricity is induced in a receiving terminal coil under the influence of the magnetic field. Here, the wireless power transmission means may include an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA), which are standard wireless charging technologies.

Also, a receiver according to an embodiment of the present invention may include at least one wireless power receiving means, and may receive wireless power from two or more transmitters at the same time. Here, the wireless power receiving means may include an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA), which are standard wireless charging technologies.

The receiver according to the present invention may be used in a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation device, A portable electronic device such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing rod, a smart watch, etc. However, the present invention is not limited thereto. It suffices.

1 is a diagram for explaining a sensing signal transmission procedure in a wireless power transmitter according to an embodiment of the present invention.

Referring to FIG. 1, the wireless power transmitter may be equipped with three transmission coils 111, 112, and 113. Each transmit coil may overlap a portion of the transmit coil with a different transmit coil, and the wireless power transmitter may include a predetermined sense signal 117, 127 for sensing the presence of the wireless power receiver through each transmit coil - And sequentially transmits digital ping signals in a predefined order.

As shown in FIG. 1, the wireless power transmitter sequentially transmits a sensing signal 117 through a primary sensing signal transmission procedure shown in a reference numeral 110, and outputs a signal strength indicator (Signal Strength Indicator 116 may identify the received transmit coil 111, 112. Subsequently, the wireless power transmitter sequentially transmits the sensing signal 127 through the secondary sensing signal transmission procedure shown at 120, and the signal strength indicator 126 is transmitted to the transmission coils 111 and 112 It is possible to control the efficiency (or charging efficiency) - that is, the state of alignment between the transmitting coil and the receiving coil - to identify a good transmitting coil and to allow power to be delivered through the identified transmitting coil, .

As shown in FIG. 1, the reason why the wireless power transmitter performs the two detection signal transmission procedures is to more accurately identify to which transmission coil the reception coil of the wireless power receiver is well aligned.

If the signal strength indicators 116 and 126 are received at the first transmission coil 111 and the second transmission coil 112 as shown in the reference numerals 110 and 120 of FIG. 1, Selects a transmission coil having the best alignment based on the signal strength indicator 126 received in each of the first transmission coil 111 and the second transmission coil 112 and performs wireless charging using the selected transmission coil .

2 is a state transition diagram for explaining a wireless power transmission procedure defined in the WPC standard.

Referring to FIG. 2, power transmission from a transmitter to a receiver according to the WPC standard is largely divided into a selection phase 210, a ping phase 220, an identification and configuration phase 230, And a power transfer phase (240).

The selection step 210 may be a phase transition when a specific error or a specific event is detected while initiating a power transmission or maintaining a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, in a selection step 210, the transmitter may monitor whether an object is present on the interface surface. If the transmitter detects that an object is placed on the interface surface, it can transition to the step 220 (S201). In the selection step 210, the transmitter transmits an analog ping signal of a very short pulse and can detect whether an object exists in the active area of the interface surface based on the current change of the transmission coil.

In step 220, the transmitter activates the receiver when an object is detected, and transmits a digital ping to identify whether the receiver is a WPC compliant receiver. If the transmitter does not receive a response signal to the digital ping (e.g., a signal strength indicator) from the receiver in step 220, the process may transit to the selection step 210 again (step S202). In addition, in the step 220, when the transmitter receives a signal indicating completion of power transmission from the receiver, that is, a charge completion signal, the transmitter may transition to the selection step 210 (S203).

Once the ping step 220 is complete, the transmitter may transition to an identification and configuration step 230 to collect receiver identification and receiver configuration and status information (S204).

In the identifying and configuring step 230, the transmitter determines whether a packet is received or unexpected, a desired packet is not received for a predefined period of time (time out), a packet transmission error (transmission error) (No power transfer contract), the process can be shifted to the selection step 210 (S205).

Once the identification and configuration for the receiver is complete, the transmitter may transition to power transfer step 240, which transmits wireless power (S206).

In a power transfer step 240, the sender may send an unexpected packet, a desired packet is not received for a predefined time (time out), a violation of a predetermined power transmission contract occurs transfer contract violation, and if the charging is completed, the selection step 210 can be transited (S207).

Also, in power transfer step 240, if the transmitter needs to reconfigure a power transfer contract based on transmitter state changes, etc., it may transition to identification and configuration step 230 (S208).

The power transmission contract may be set based on the status and characteristic information of the transmitter and the receiver. For example, the transmitter status information may include information on the maximum amount of transmittable power, information on the maximum number of receivable receivers, and the receiver status information may include information on the requested power and the like.

3 is a state transition diagram for explaining a wireless power transmission procedure defined in the PMA standard;

Referring to FIG. 3, the power transmission from the transmitter to the receiver according to the PMA standard is largely divided into a standby phase 310, a digital ping phase 320, an identification phase 330, A Power Transfer Phase 340, and an End of Charge Phase 350.

The waiting step 310 may be a step of performing a receiver identification procedure for power transmission or a transition if a specific error or a specific event is detected while maintaining a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, at the standby step 310, the transmitter may monitor whether an object is present on the Charging Surface. If the transmitter detects that an object has been placed on the charging surface, or if an RXID retry is in progress, the digital pinging step 320 may proceed (S301). Here, RXID is a unique identifier assigned to a PMA compatible receiver. At the standby step 310, the transmitter transmits an analog ping of a very short pulse and, based on the change in current of the transmitting coil, causes the object to move to the active surface of the interface surface-for example, It can be detected whether or not it exists.

The transmitter transited to the digital ping stage 320 sends a digital finger signal to identify whether the sensed object is a PMA compatible receiver. When sufficient power is supplied to the receiving end by the digital ding signal transmitted by the transmitter, the receiver can modulate the received digital ding signal according to the PMA communication protocol and transmit a predetermined response signal to the transmitter. Here, the response signal may include a signal strength indicator indicating the strength of the power received at the receiver. At step 320, the receiver may transition to an identification step 330 if a valid response signal is received (S302).

If the response signal is not received or it is determined that it is not a PMA compatible receiver, i.e., it is a Foreign Object Detection (FOD), at step 310, the transmitter may transition to the wait step 310 (S303). As an example, a foreign object (FO) may be a metallic object including coins, keys, and the like.

In the identifying step 330, the transmitter may transition to the waiting step 310 if the receiver identification procedure fails or the receiver identification procedure must be re-performed and the receiver identification procedure has not been completed for a predefined period of time S304).

If the transmitter succeeds in identifying the receiver, the transmitter may transition to power transfer step 340 in the identification step 330 and initiate charging (S305).

In a power transfer step 340, if the desired signal is not received within a predetermined time (Time Out), a foreign object (FO) is detected, or the voltage of the transmit coil exceeds a predefined reference value, (S306). ≪ / RTI >

In addition, in the power transmission step 340, if the temperature sensed by the temperature sensor provided inside the transmitter exceeds a predetermined reference value, the transmitter may transition to the charging completion step 350 (S307).

In the charge completion step 350, if the transmitter is confirmed that the receiver has been removed from the charging surface, the transmitter may transition to the standby state 310 (S309).

Also, if the measured temperature drops below the reference value in the over temperature state, the transmitter may transition from the charging completion step 350 to the digital charging step 320 (S310).

In the digital ping phase 320 or power transmit phase 340, the transmitter may transition to the charge completion phase 350 (S308 and S311) when an End Of Charge (EOC) request is received from the receiver.

4 is a diagram for explaining an electromagnetic induction type wireless charging system according to an embodiment of the present invention.

Referring to FIG. 4, an electromagnetic induction wireless charging system includes a wireless power transmitter 400 and a wireless power receiver 450. The wireless power transmitter 400 and the wireless power receiver 450 are substantially identical to the wireless power transmitter and wireless power receiver described in FIG.

Placing the electronic device including the wireless power receiver 450 on the wireless power transmitter 400 allows the coils of the wireless power transmitter 400 and the wireless power receiver 450 to be coupled together by an electromagnetic field.

The wireless power transmitter 400 can modulate the power signal and change the frequency to create an electromagnetic field for power transmission. The wireless power receiver 450 receives the power by demodulating the electromagnetic signal according to the protocol set for the wireless communication environment and controls the power of the wireless power transmitter 400 based on the received power And transmit the feedback signal to the wireless power transmitter 400 via in-band communication. For example, the wireless power transmitter 400 may control the operating frequency according to a control signal for power control to increase or decrease the transmitted power.

The amount of power transmitted (or increased / decreased) may be controlled using a feedback signal transmitted from the wireless power receiver 450 to the wireless power transmitter 400. The communication between the wireless power receiver 450 and the wireless power transmitter 400 is not limited to the in-band communication using the feedback signal described above, -of-band communication. For example, short-range wireless communication modules such as Bluetooth, Bluetooth Low Energy (BLE), NFC, and Zigbee may be used.

In the electromagnetic induction method, a frequency modulation scheme may be used as a protocol for exchanging state information and control signals between the wireless power transmitter 400 and the wireless power receiver 450. Device identification information, charge status information, power control signals, etc. may be exchanged through the protocol.

As shown in FIG. 4, the wireless power transmitter 400 according to an embodiment of the present invention includes a signal generator 420 for generating a power signal, a controller 420 for detecting a feedback signal transmitted from the wireless power receiver 450, A coil L1 and capacitors C1 and C2 located between the power supply terminals V_Bus and GND and switches SW1 and SW2 whose operation is controlled by the signal generator 420. [ The signal generator 420 includes a demodulator 424 for demodulating the feedback signal transmitted through the coil L1, a frequency driver 426 for changing frequency, a control unit 424 for controlling the frequency driver 426, And a transmission control unit 422 for controlling the transmission. The feedback signal transmitted through the coil L1 is demodulated by the demodulation unit 424 and then input to the transmission control unit 422. The transmission control unit 422 controls the frequency driving unit 426 based on the demodulated signal The frequency of the power signal transmitted to the coil L1 can be changed.

The wireless power receiver 450 includes a modulator 452 for transmitting a feedback signal through a coil L2, a rectifier 454 for converting an AC signal received via the coil L2 into a DC signal, And a receiving controller 460 for controlling the modulating unit 452 and the rectifying unit 454. The receive controller 460 includes a power supply 462 for supplying power necessary for operation of the rectifier 454 and other wireless power receivers 450 and a rectifier 454 for outputting the output DC voltage to the charge object A DC-DC converting unit 464 for changing to a DC voltage meeting the charging requirement, a load 468 for outputting the converted power, and a receiving power state and a charging target state to the wireless power transmitter 400 And a feedback communication unit 466 for generating a feedback signal for the feedback signal.

In FIG. 4, the coil L1 included in the wireless power transmitter 400 refers to the three transmission coils 111, 112 and 113 shown in FIG. 1, and the switch L1 connected to the transmission coils 111, SW1 and SW2 and the capacitors C1 and C2 may be provided independently for each of the transmission coils 111, 112 and 113, but the scope of the present invention is not limited thereto.

5 is a front view of a transmission coil according to an embodiment of the present invention.

Referring to FIG. 5, the transmission coil 500 is illustrated as a helical structure close to a concentric circle, but the scope of the present invention is not limited thereto. For example, it can be realized as a spiral structure close to a circle, and any shape can be deformed if a conductor is integrally wound.

The transmission coil 500 can be fabricated by patterning both surfaces of a copper plate formed of copper (Cu) into the shape of the transmission coil 500 and by a symmetrical etching process for both surfaces. The etching process for both surfaces may be performed sequentially or simultaneously.

As described above, the transmission coil 500 manufactured by the etching process may be referred to as etching copper. The wire of the transmission coil 500 may have a relatively large diameter (for example, 500 .mu.m) . In the meantime, the transmission coil 500 manufactured by the etching process can be attached to a PCB (Printed Circuit Board) without attaching the film (PI film) ) Is difficult to hold, and there is a possibility that a short phenomenon occurs in which adjacent conductors come into contact with each other. In addition, the transmission coil 500 may be exposed to the outside and contamination by foreign matter may occur.

A first terminal 510 may be formed at the outer end of the transmission coil 500 and a second terminal 520 may be formed at the inner end of the transmission coil 500. The first terminal 510 and the second terminal 520 correspond to both ends of the coil L1 shown in FIG. 4 and can be connected to the control circuit board. The control circuit board corresponds to the substrate including the configurations for controlling the operation of the wireless power transmitter 400 such as the switches SW1 and SW2 and the signal generator 420. [

Fig. 6 is a view showing a guide substrate for receiving the transmission coil of Fig. 5;

Referring to FIG. 6, the guide substrate 600 can maintain the shape of the transmission coil 500 and prevent the transmission coil 500 from being short-circuited.

The support substrate 600 may include first to fourth coil guides 610-1 to 610-4, a coil outer guide 620, a coil receiving portion 630, and a first terminal receiving portion 640 .

Each of the first to fourth coil guides 610-1 to 610-4 may be arranged in a line in any one of the upper, lower, left, and right directions of the guide substrate 600. [ Each of the first through fourth coil guides 610-1 through 610-4 is formed so as to prevent contact between the inner conductor and the outer conductor adjacent to each other of the spiral wound transmission coil 500, And may include a guide structure positioned between the conductors.

The number of the guide structures included in each of the first to fourth coil guides 610-1 to 610-4 may be equal to the number of times (N (N is an integer of 1 or more)) of the transmission coil 500 wound, The scope of the invention is not limited thereto. If the number of the guide structures is equal to the number of times N of the transmission coil 500 is wound, all of the conductors from the innermost conductor to the outermost conductor of the transmission coil 500 may not be in contact with each other have.

The arrangement of the guide structures included in each of the first through fourth coil guides 610-1 through 610-4 may be perpendicular to the direction of the concentric circles of the transmission coil 500.

The spacing between adjacent guide structures included in each of the first through fourth coil guides 610-1 through 610-4 may be greater than or equal to the diameter of the conductor of the transmission coil 500, The scope is not limited thereto.

In this specification, the first through fourth coil guides 610-1 through 610-4 are arranged in a line in any one of the upper, lower, left, and right directions of the guide board 600, However, the scope of the present invention is not limited thereto.

That is, the present invention relates to a structure for preventing contact between adjacent conductors of the transmission coil 500. The position or number of the coil guides and the positions or the numbers of the guide structures included in the respective coil guides can be deformed Do.

For example, other coil guides may be formed not only in the upper, lower, left, and right sides of the guide substrate 600 but also in the directions of the upper, upper, lower, and upper sides.

Depending on the embodiment, the number and thickness of the coil guides may be determined in consideration of the characteristics of the transmission coil 500. That is, when the stiffness of the transmission coil 500 is low or the deformation due to temperature rise is large, the number and thickness of the coil guides can be increased.

The coil outer guide 620 may have a shape corresponding to the outer shape of the transmission coil 500 and may support the outer side of the transmission coil 500 so that the outer shape of the transmission coil 500 is maintained. The heights of the top surfaces of the coil outer guide 620 and the first to fourth coil guides 610-1 to 610-4 may be the same.

The coil accommodating portion 630 is provided on the upper side of the coil outer guide 620 and the first to fourth coil guides 610-1 to 610-4 so that the transmission coil 500 can be accommodated in the guide substrate 600. [ And may have a height that is less than the height of the face. The height may be greater than or equal to the diameter of the conductor of the transmission coil 500, but the scope of the present invention is not limited thereto.

The first terminal accommodating portion 640 refers to a space for accommodating the first terminal 510 of the transmission coil 500 in the coil outer guide 620 and the coil accommodating portion 630.

The guide substrate 600 can be manufactured by pressing a substrate made of acrylic or plastic, but the scope of the present invention is not limited thereto.

7 is a view showing a state in which the transmission coil is mounted on the guide board of Fig.

7, the transmission coil 500 is mounted on the coil receiving portion 630 of the guide substrate 600, and the first to fourth coil guides 610-1 to 610- 610-4 prevent contact between the adjacent inner and outer conductors of the spiral wound coil. 8 and 9, the coupling structure A in which the transmission coil 500 is mounted on the guide substrate 600 and the cross-section B of the coupling structure A will be described in more detail.

8 is a view showing a coupling structure in which a transmission coil is mounted on the guide board shown in FIG. 7 in more detail. 9 is a cross-sectional view of the coupling structure shown in Fig.

Referring to FIG. 8, a coupling structure A in which a transmission coil 500 is mounted on a guide substrate 600 is shown.

The second coil guide 610-2 provides a space in which the respective coils of the coil 500 can be fitted and prevents the inner and outer coils adjacent to each other of the coils 500 from contacting each other. The outermost conductor can be sandwiched between the second coil guide 610-2 and the coil outer guide 620. [

In FIG. 8, the second coil guide 610-2 and the coil outer guide 620 made of the same material are shown with the same hatched pattern for convenience of explanation. The second coil guide 610-2, the coil outer guide 620, The coil receiving portion 630 having a height smaller than the height of the upper surface of the coil receiving portion 630 is shown as having no pattern.

Fig. 9 shows a cross section B of the coupling structure A formed along the vertical line P-P 'shown in Fig.

8, the second coil guide 610-2 and the coil outer guide 620 provide a space in which the transmission coil 500 can be fitted, and the transmission coil 500 is fitted in this space, The lead wire and the outer lead wire can be prevented from coming into contact with each other.

As a result, a short circuit due to the contact between the wires can be prevented, thereby preventing the transmitter coil 500 from operating normally.

10 is a view showing an embodiment of a transmission coil module having a shielding agent attached to a cross section of the coupling structure shown in FIG.

10, the transmission coil module 1000 includes a lower portion of the cross-section B of the coupling structure in which the transmission coil 500 is mounted on the guide substrate 600 (the cross-section shown in FIG. 10 is a cross- And the lower part of FIG. 9 is defined as an upper part). The shielding agent 1050 can block the magnetic field radiated from the transmission coil 500 and perform the function of causing the magnetic field to radiate only to the top without affecting the underlying control circuit board.

Here, the method of attaching the shielding agent 1050 may be a method using a separate adhesive sheet (for example, a double-sided tape) or a coating method (bonding method) of a synthetic resin having an adhesive force and an insulating property. However, It is not limited. Further, the shielding agent 1050 may be a ferrite sheet, but the scope of the present invention is not limited thereto.

The transmission coil module 1000 may have a PCB attached thereto and the transmission coil 500 may be electrically connected to the control circuit board through a connector mounted on the PCB. The shielding agent 1050 may include at least one hole through which the lead wire connected to the first terminal 510 and the second terminal 520 of the transmission coil 500 can pass.

11 is a view showing another embodiment of a transmission coil module with a shielding agent attached to the end surface of the coupling structure shown in FIG.

11, the transmission coil module 1100 is configured such that the shielding agent 1050 is not directly attached to the lower portion of the cross section B of the coupling structure in which the transmission coil 500 is mounted on the guide substrate 600, And an auxiliary PCB 1150 between the end surface (B) and the end surface (B).

The auxiliary PCB 1150 may include a lead pattern connected from the position of the first terminal 510 and the second terminal 520 to the connector mounted on the PCB attached to the lower portion of the transmission coil module 1000. As a result, the auxiliary PCB 1150 can prevent the connection from the first terminal 510 and the second terminal 520 to the connector from being disconnected due to disconnection of the lead wires or the like.

The auxiliary PCB 1150 may have a relatively thin thickness than the PCB attached to the bottom of the transmission coil module 1000. [

The transmission coil modules 1000 and 1100 shown in FIG. 10 or 11 can prevent a short circuit phenomenon between adjacent inner and outer leads of the transmission coil 500, It is possible to prevent a foreign matter from flowing from the outside and influencing the transmission coil 500 by protecting the antenna 500.

Accordingly, the transmission coil modules 1000 and 1100 according to the embodiment of the present invention may include a transmission coil 500, which is an etching copper having a relatively large diameter.

The transmission coil 500, which is an etching copper, may have the following advantages.

The power transmission efficiency of the wireless power transmitter is changed by the DC resistance (DCR) and the AC resistance (ACR) of the transmission coil 500. The direct current resistance (DCR) and the alternating current resistance (ACR) refer to the resistance of the conductor to the direct current and the alternating current, respectively.

The DC resistance (DCR) and the AC resistance (ACR) can be expressed by the following equations (1) and (2), respectively.

In the equation (1), DC resistance (DCR) can be expressed as a value obtained by dividing the product of the resistivity and the conductor length by the conductor area, where the resistivity is the electrical resistance of the conductor having a length of 1 m and a cross- Is a unique value.

That is, since the conductor of the transmission coil 500, which is an etching copper, has a relatively large diameter, the conductor area becomes large and the DC resistance (DCR) becomes low, have.

In Equation (2), the AC resistance (ACR) can be expressed by a value obtained by dividing the product of the resistivity and the conductor length by the effective area of the coil, where the coil effective area is a unique value determined according to the skin depth. The skin depth means a ratio of an area through which a current per unit area can flow.

That is, since the conductor of the transmission coil 500, which is etching copper, has a relatively large diameter, the skin depth, which is the ratio of the area through which the current per unit area can flow, becomes large and the AC resistance (ACR) So that the power transmission efficiency can be improved.

According to the experimental results, the DC resistance (DCR) of the transmission coil 500, which is an etching copper, exhibits a resistance of about 0.047 ohms, and a typical PCB type (a method of forming a patterned transmission coil on a PCB) The direct current resistance (DCR) exhibits a resistance of about 0.074 to 0.134 ohms, which can lead to a reduction in the resistance component of about 2 to 3 times.

The alternating current (ACR) of the transmission coil 500, which is an etching copper, exhibits a resistance of about 0.080 ohms. The AC resistance of a typical PCB type coil has a resistance of about 0.106 to 0.164 ohms, It is possible to reduce the resistance component by 1.5 to 2 times.

The method according to the above-described embodiments may be implemented as a program to be executed by a computer and stored in a computer-readable recording medium. Examples of the computer-readable recording medium include a ROM, a RAM, a CD- , A floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet).

The computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional program, code, and code segments for implementing the above-described method can be easily inferred by programmers in the technical field to which the embodiment belongs.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

600: Wireless power transmitter
610-1 to 610-4: first to fourth coil guides
620: Coil outer guide
630: coil receiving portion

Claims (9)

A transmit coil for transmitting wireless power; And
At least one coil guide for preventing contact between adjacent ones of the transmission coils, and a coil receiving portion for receiving the transmission coil. The method according to claim 1,
Wherein the at least one coil guide comprises:
And a plurality of guide structures arranged perpendicularly to the direction of the concentric circles of the transmit coil, wherein each of the plurality of guide structures is located between adjacent ones of the conductors. 3. The method of claim 2,
Wherein the number of the plurality of guide structures is equal to the number of times the transmission coil is wound. The method according to claim 1,
Wherein a distance between adjacent guide structures of the plurality of guide structures is equal to a diameter of a lead of the transmission coil. The method according to claim 1,
And the height of the coil receiving portion is equal to the diameter of the lead wire of the transmitting coil. The method according to claim 1,
And a shielding member attached to a lower portion of the guide board to shield a magnetic field of the transmission coil. Forming a guide substrate including at least one coil guide for preventing contact between mutually adjacent conductors of a transmitting coil for transmitting radio power, and a coil receiving portion for receiving the transmitting coil; And
And inserting the transmission coil into the coil receiving portion such that a lead of the transmission coil is inserted into the at least one coil guide. 8. The method of claim 7,
And attaching a shielding agent to the lower portion of the guide substrate to block the magnetic field of the transmission coil. 8. The method of claim 7,
Wherein the at least one coil guide comprises:
A plurality of guide structures arranged perpendicularly to the direction of the concentric circles of the transmit coil, each of the plurality of guide structures being located between adjacent ones of the conductors.

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