KR20180037540A - Wireless power transmitter - Google Patents

Abstract

A wireless power transmitter according to an embodiment includes: a plurality of transmission coils; a plurality of resonance circuits corresponding to the plurality of transmission coils; a drive circuit connected to the plurality of resonant circuits; a plurality of switches connecting the plurality of resonance coils and the drive circuit; and a plurality of shielding materials disposed in the lower part of the plurality of transmission coils and having different magnetic permeability. At least one of the plurality of transmission coils is disposed at a different height from the at least one transmission coil except the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials may have a permeability different from that of at least one shielding material except the at least one shielding material. It is possible to control the plurality of transmission coils with only one circuit.

Description

[0001] WIRELESS POWER TRANSMITTER [0002]

The present invention relates to a wireless power transmitter.

Portable terminals, such as mobile phones and laptops, include a battery for storing power and a circuit for charging and discharging the battery. In order for the battery of such a terminal to be charged, power must be supplied from an external charger.

2. Description of the Related Art [0002] Generally, as an example of an electrical connection between a charging device and a battery for charging electric power of a battery, a commercial electric power is supplied to a terminal for converting electric power into voltage and current corresponding to the battery, Supply method. This type of terminal supply is accompanied by the use of physical cables or wires. Therefore, when handling a lot of terminal-supplied equipment, many cables occupy considerable work space, are difficult to organize, and are not well apparent. Also, the terminal supply method may cause problems such as instantaneous discharge due to different potential difference between terminals, burnout due to foreign substances, fire, natural discharge, battery life and deterioration of performance.

In order to solve such a problem, a charging system (hereinafter referred to as a "wireless charging system") and a control method using a method of transmitting power wirelessly are proposed. In addition, since the wireless charging system has not been installed in some portable terminals in the past and the consumer has to purchase a separate wireless charging receiver accessory, the demand for the wireless charging system is low, but the wireless charging user is expected to increase rapidly. Wireless charging function is expected to be equipped basically.

Generally, a wireless charging system comprises a wireless power transmitter for supplying electric energy in a wireless power transmission mode and a wireless power receiver for receiving electric energy supplied from a wireless power transmitter to charge the battery.

Such a wireless charging system may transmit power by at least one wireless power transmission scheme (e.g., electromagnetic induction scheme, electromagnetic resonance scheme, RF wireless power transmission scheme, etc.).

For example, the wireless power transmission scheme may be based on a variety of wireless power transmission standards based on an electromagnetic induction scheme in which a magnetic field is generated in a power transmitter coil and charged using an electromagnetic induction principle in which electricity is induced in a receiver coil under the influence of its magnetic field . Here, the electromagnetic induction type wireless power transmission standard may include an electromagnetic induction wireless charging technique defined in a Wireless Power Consortium (WPC) or a Power Matters Alliance (PMA).

In another example, the wireless power transmission scheme may employ an electromagnetic resonance scheme in which the magnetic field generated by the transmission coil of the wireless power transmitter is tuned to a specific resonance frequency to transmit power to a nearby wireless power receiver . Here, the electromagnetic resonance method may include a resonance-type wireless charging technique defined in the Alliance for Wireless Power (A4WP) standard mechanism, a wireless charging technology standard mechanism.

In another example, a wireless power transmission scheme may use an RF wireless power transmission scheme that transmits power to a wireless power receiver located at a remote location by applying low-power energy to the RF signal.

On the other hand, the wireless power transmitter may include a plurality of transmit coils. The wireless power transmitter can expand the charging area by using more than one transmitting coil when it includes a single transmitting coil.

Each of the plurality of transmit coils included in the wireless power transmitter can be made to have the same physical characteristics. However, depending on the arrangement of the transmission coil, an area overlapping between the coils may occur, and the inductance may vary depending on the distance from the shielding material that affects the magnetic field generated in the transmission coil.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shield for a wireless power transmitter including a plurality of transmission coils.

The present invention can control the plurality of transmission coils with only one circuit by using a plurality of shielding materials having different permeability to equalize the inductance values of the plurality of transmission coils having different inductances.

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 wireless power transmitter according to an embodiment includes: a plurality of transmission coils; A plurality of resonant circuits corresponding to the plurality of transmission coils; One drive circuit connected to the plurality of resonant circuits; A plurality of switches connecting the plurality of resonant coils and the one drive circuit; And a plurality of shielding materials disposed at a lower portion of the plurality of transmission coils and having different magnetic permeability, wherein at least one of the plurality of transmission coils is different from at least one transmission coil except for the at least one transmission coil And at least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials may have a permeability different from that of at least one shielding material except the at least one shielding material.

Effects of the wireless power transmitter and the shielding material including a plurality of coils according to the embodiment will be described as follows.

First, the embodiment can have a wider charging area by using a plurality of transmission coils, thereby improving user convenience.

Second, in the embodiment, only one of the same circuits can be used, so that the size of the wireless power transmitter itself can be reduced, and the parts used are reduced, thereby reducing the cost.

Third, embodiments may utilize component elements defined in the published wireless power transmission standard, and may be in accordance with predefined standards.

The effects obtained in the embodiments are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below 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 block diagram illustrating a wireless charging system according to an embodiment.
2 is a block diagram illustrating a wireless charging system according to another embodiment.
3 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment.
4 is a state transition diagram for explaining the wireless power transmission procedure defined in the WPC standard.
5 is a state transition diagram for explaining the wireless power transmission procedure defined in the PMA standard.
6 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment.
7 is a diagram for explaining a packet format according to an electromagnetic induction wireless power transmission procedure according to an embodiment.
FIG. 8 is a diagram for explaining the types of packets that the wireless power receiving apparatus according to the electromagnetic induction-type wireless power transmission procedure according to one embodiment can transmit in the ping stage.
9 is a diagram for explaining a message format of an identification packet according to an electromagnetic induction wireless power transmission procedure according to an embodiment.
10 is a diagram for explaining a message format of a configuration packet and a power control hold packet according to an electromagnetic induction wireless power transmission procedure according to an embodiment.
11 is a diagram for explaining a type of a packet that can be transmitted in a power transmission step and a message format thereof by a wireless power receiving apparatus according to an electromagnetic induction wireless power transmission procedure according to an embodiment.
12 is a view for explaining the arrangement of a plurality of transmission coils and the distance to a shielding member according to an embodiment.
13 shows a wireless power transmitter including a plurality of shielding members according to an embodiment.
14 shows a wireless power transmitter including a plurality of shielding members according to another embodiment.
FIG. 15 illustrates a wireless power transmitter including a plurality of shielding members according to another embodiment.
16 illustrates a wireless power transmitter including a plurality of shielding members according to yet another embodiment.
17 illustrates a wireless power transmitter including a plurality of shielding members according to yet another embodiment.
18 shows a wireless power transmitter including a plurality of shielding members according to yet another embodiment.
19 shows a wireless power transmitter including a plurality of shielding materials having different permeability according to another embodiment.
20 illustrates a wireless power transmitter including a plurality of shielding materials having different permeability according to yet another embodiment.
FIG. 21 illustrates a wireless power transmitter including a plurality of shielding materials having different permeability according to another embodiment.
22 is a plurality of shielding materials having different shapes or areas according to the embodiment.
23 is a plurality of shielding materials having different shapes or areas according to another embodiment.
24 is a plurality of shielding materials having different shapes or areas according to still another embodiment.
25 is a view for explaining three drive circuits including a full-bridge inverter in a wireless power transmitter including a plurality of coils according to an embodiment.
26 is a view for explaining a wireless power transmitter including a plurality of coils including one drive circuit according to an embodiment.
27 is a view for explaining a drive circuit including a full-bridge inverter according to an embodiment.
28 is a view for explaining a plurality of switches for connecting any one of a plurality of transmission coils to a drive circuit according to an embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which the embodiments 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.

The present invention is not necessarily limited to these embodiments, as long as all of the constituent elements of the embodiment are described as being combined or operated together. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art. Such a computer program may be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing embodiments. As the storage medium of the computer program, a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.

In the description of the embodiment, in the case of being described as being formed on the "upper or lower", "before" or "after" of each component, (Lower) " and " front or rear " encompass both that the two components are in direct contact with each other or that one or more other components are disposed between the two components.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the description of the embodiments, an apparatus for transmitting wireless power on a wireless power charging 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, a wireless charging device, and the like. For the sake of convenience, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a wireless power receiving device, a receiving terminal, a receiving side, a receiving device, a receiver Terminals and the like can be used in combination.

The wireless charging device according to the embodiment 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 may be transmitted to the device.

As an example, a wireless power transmitter can be used not only on a desk or on a table, but also developed for automobiles and used in a vehicle. A wireless power transmitter installed in a vehicle can be provided in a form of a stand that can be easily and stably fixed and mounted.

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, an MP3 player, (Hereinafter referred to as a " device ") capable of charging a battery by mounting a wireless power receiving means according to the present invention, but not limited thereto, can be used for a small electronic device such as a toothbrush, an electronic tag, Quot;), and the term terminal or device may be used in combination. The wireless power receiver according to another embodiment may be mounted on a vehicle, an unmanned aerial vehicle, an air drone or the like.

A wireless power receiver according to an exemplary embodiment may be equipped with at least one wireless power transmission scheme and may simultaneously receive wireless power from two or more wireless power transmitters. Here, the wireless power transmission scheme may include at least one of the electromagnetic induction scheme, the electromagnetic resonance scheme, and the RF wireless power transmission scheme. In particular, the wireless power receiving means for supporting the electromagnetic induction method may include an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA).

Generally, a wireless power transmitter and a wireless power receiver that constitute a wireless power system can exchange control signals or information through in-band communication or Bluetooth low energy (BLE) communication. Here, the in-band communication and the BLE communication can be performed by a pulse width modulation method, a frequency modulation method, a phase modulation method, an amplitude modulation method, an amplitude and phase modulation method, and the like. For example, the wireless power receiver can transmit various control signals and information to the wireless power transmitter by generating a feedback signal by switching on / off the current induced through the reception coil in a predetermined pattern. The information transmitted by the wireless power receiver may include various status information including received power intensity information. At this time, the wireless power transmitter can calculate the charging efficiency or the power transmission efficiency based on the received power intensity information.

1 is a block diagram illustrating a wireless charging system according to an embodiment.

Referring to FIG. 1, the wireless charging system includes a wireless power transmitter 10 for wirelessly transmitting power, a wireless power receiver 20 for receiving the transmitted power, and an electronic device 20 Lt; / RTI >

For example, the wireless power transmitter 10 and the wireless power receiver 20 may perform in-band communication in which information is exchanged using the same frequency band as that used for wireless power transmission. In another example, the wireless power transmitter 10 and the wireless power receiver 20 may use out-of-band communication to exchange information using a separate frequency band that is different from the operating frequency used for wireless power transmission .

As an example, information exchanged between the wireless power transmitter 10 and the wireless power receiver 20 may include control information as well as status information of each other. Here, the status information and control information exchanged between the transceivers will become more apparent through the description of the embodiments to be described later.

The in-band communication and the out-of-band communication may provide bidirectional communication, but the present invention is not limited thereto. In another embodiment, the in-band communication and the out-of-band communication may be provided.

 In one example, the unidirectional communication may be that the wireless power receiver 20 only transmits information to the wireless power transmitter 10, but the wireless power transmitter 10 is not limited to this, Lt; / RTI >

In the half duplex communication mode, bi-directional communication is possible between the wireless power receiver 20 and the wireless power transmitter 10, but information can be transmitted only by any one device at any time.

The wireless power receiver 20 according to one embodiment may obtain various status information of the electronic device 30. [ For example, the status information of the electronic device 30 may include current power usage information, information for identifying a running application, CPU usage information, battery charge status information, battery output voltage / current information, And is information obtainable from the electronic device 30 and available for wireless power control.

In particular, the wireless power transmitter 10 according to one embodiment may transmit a predetermined packet to the wireless power receiver 20 indicating whether to support fast charging. The wireless power receiver 20 can notify the electronic device 30 if the connected wireless power transmitter 10 is determined to support the fast charge mode. The electronic device 30 may indicate that fast charging is possible through a predetermined display means, which may be, for example, a liquid crystal display.

In addition, the user of the electronic device 30 may select a predetermined fast charge request button displayed on the liquid crystal display means to control the wireless power transmitter 10 to operate in the fast charge mode. In this case, the electronic device 30 may transmit a predetermined fast charge request signal to the wireless power receiver 20 when the quick charge request button is selected by the user. The wireless power receiver 20 can generate a charging mode packet corresponding to the received fast charging request signal and send it to the wireless power transmitter 10 to switch the normal low power charging mode to the fast charging mode.

2 is a block diagram illustrating a wireless charging system according to another embodiment.

For example, as shown in 200a, the wireless power receiver 20 may be configured with a plurality of wireless power receiving devices, wherein a plurality of wireless power receiving devices are connected to one wireless power transmitter 10, Charging may also be performed. In this case, the wireless power transmitter 10 may distribute power to a plurality of wireless power receiving apparatuses in a time division manner, but the present invention is not limited thereto. For example, the wireless power transmitter 10 may transmit Power can be distributed and transmitted to a plurality of wireless power receiving apparatuses using different allocated frequency bands.

At this time, the number of wireless power receiving apparatuses connectable to one wireless power transmitting apparatus 10 is set to at least one of the required power amount for each wireless power receiving apparatus, the battery charging state, the power consumption amount of the electronic apparatus, Can be determined adaptively based on

As another example, as shown in FIG. 200B, the wireless power transmitter 10 may be composed of a plurality of wireless power transmission devices. In this case, the wireless power receiver 20 may be coupled to a plurality of wireless power transmission devices at the same time, and may receive power from the connected wireless power transmission devices at the same time to perform charging. At this time, the number of wireless power transmission apparatuses connected to the wireless power receiver 20 may be adaptively calculated based on the required power amount of the wireless power receiver 20, the battery charging status, the power consumption amount of the electronic apparatus, Can be determined.

3 is a diagram for explaining a sensing signal transmission procedure in a wireless charging system according to an embodiment.

As an example, the wireless power transmitter may be equipped with three transmit coils 111, 112, 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. 3, the wireless power transmitter sequentially transmits the detection signal 117 through the primary sensing signal transmission procedure shown in reference numeral 110, and receives a signal strength indicator (Signal Strength Indicator 116 (or signal strength packet) may be received. Subsequently, the wireless power transmitter sequentially transmits the detection signal 127 through the secondary detection signal transmission procedure shown in the reference numeral 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. 3, 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 aforementioned numerals 110 and 120 of FIG. 3, Selects a transmission coil having the best alignment based on the received signal strength indicator 126 in each of the first transmission coil 111 and the second transmission coil 112 and performs wireless charging using the selected transmission coil .

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

Referring to FIG. 4, power transmission from a transmitter to a receiver according to the WPC standard is largely divided into a selection phase 410, a ping phase 420, an identification and configuration phase 430, And a power transfer phase (step 440).

The selection step 410 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 410, 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 420 (S401). In the selection step 410, 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 420, the transmitter activates the receiver when an object is sensed, and transmits a digital ping to identify whether the receiver is a WPC compliant receiver. If the transmitter does not receive a response signal for the digital ping (e.g., a signal strength indicator) from the receiver in step 420, then the transmitter may transition back to the selection step 410 (S402). Also, in step 420, the transmitter may transition to a selection step 410 when receiving a signal indicating completion of power transmission from the receiver, i.e., a charging completion signal (S403).

Once the ping stage 420 is complete, the transmitter may transition to an identification and configuration step 430 to collect receiver identification and receiver configuration and status information (S404).

In the identifying and configuring step 430, the sender may determine whether the packet is unexpected, whether a desired packet is received during 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 410 (S405).

Once the identification and configuration for the receiver is complete, the transmitter may transition to power transfer step 440, which transmits the wireless power (S406).

In the power transfer step 440, the transmitter determines whether an unexpected packet is received, a desired packet is received for a predefined period of time (time out), a violation of a predetermined power transmission contract occurs transfer contract violation, and if the charging is completed, the selection step 410 can be performed (S407).

In addition, in the power transfer step 440, if the transmitter needs to reconfigure the power transfer contract according to changes in the transmitter state, etc., it may transition to the identification and configuration step 430 (S408).

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.

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

Referring to FIG. 5, power transmission from a transmitter to a receiver according to the PMA standard is largely divided into a standby phase 510, a digital ping phase 520, an identification phase 530, A Power Transfer Phase 540, and an End of Charge Phase 550. FIG.

The waiting step 510 may be a step of performing a receiver identification procedure for power transmission or transitioning to a specific error or a specific event while sensing a power transmission. Here, the specific error and the specific event will become clear through the following description. Also, at a standby step 510, 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 switching may proceed to step 520 (S501). Here, RXID is a unique identifier assigned to a PMA compatible receiver. At the standby step 510, 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 pinging step 520 sends a digital finger signal to identify whether the sensed object is a PMA compatible receiver. When sufficient power is supplied to the receiver by the digital ping signal transmitted by the transmitter, the receiver can modulate the received digital ping 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 520, the receiver can transition to the identification step 530 if a valid response signal is received (S502).

If the response signal is not received or it is determined that it is not a PMA compliant receiver, i.e., it is a Foreign Object Detection (FOD), at step 520, the transmitter can transition to the wait step 510 (S503). As an example, a foreign object (FO) may be a metallic object including coins, keys, and the like.

In the identifying step 530, the transmitter may transition to the wait step 510 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 S504).

If the transmitter succeeds in identifying the receiver, the transmitter may transition from the identifying step 530 to the power transfer step 540 and start charging (S505).

In the power transfer step 540, the transmitter determines if the desired signal is not received within a predetermined time (Time Out), an FO is detected, or if the voltage of the transmit coil exceeds a predefined reference value, (S506).

Also, in the power transmission step 540, if the temperature sensed by the temperature sensor provided inside the transmitter exceeds a predetermined reference value, the transmitter may transition to the completion of charging step 550 (S507).

In the charge completion step 550, if the transmitter is confirmed that the receiver has been removed from the charging surface, the transmitter can transition to the standby state 510 (S509).

If the measured temperature drops below the reference value in the over temperature state, the transmitter may transition from the charging completion step 550 to the digital charging step 520 in step S510.

In the digital ping phase 520 or the power transfer phase 540, the transmitter may transition to the charge completion phase 550 (S508 and S511) when an End Of Charge (EOC) request is received from the receiver.

6 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment.

6, the wireless power transmitter 600 may include a power conversion unit 610, a power transmission unit 620, a communication unit 630, a control unit 640, and a sensing unit 650 . It should be noted that the configuration of the wireless power transmitter 600 described above is not necessarily an essential configuration, and may be configured to include more or less components.

As shown in FIG. 6, when power is supplied from the power supply unit 660, the power conversion unit 610 may convert the power to a predetermined intensity.

For this, the power conversion unit 610 may include a DC / DC conversion unit 611 and an amplifier 612.

The DC / DC converting unit 611 may convert DC power supplied from the power supply unit 650 into DC power having a specific intensity according to a control signal of the controller 640. [

At this time, the sensing unit 650 may measure the voltage / current of the DC-converted power and provide the measured voltage / current to the controller 640. In addition, the sensing unit 650 may measure the internal temperature of the wireless power transmitter 600 and may provide the measurement result to the controller 640 in order to determine whether overheating occurs. For example, the control unit 640 may adaptively cut off the power supply from the power supply unit 650 or block the supply of power to the amplifier 612 based on the voltage / current value measured by the sensing unit 650 . To this end, a power cutoff circuit may be further provided at one side of the power conversion unit 610 to cut off power supplied from the power supply unit 650 or to cut off power supplied to the amplifier 612.

The amplifier 612 can adjust the intensity of the DC / DC-converted power according to the control signal of the controller 640. For example, the control unit 640 may receive the power reception status information and / or the power control signal of the wireless power receiver through the communication unit 630 and may receive the power control information based on the received power reception status information and / So that the amplification factor of the amplifier 612 can be dynamically adjusted. For example, the power reception status information may include, but is not limited to, the intensity information of the rectifier output voltage, the intensity information of the current applied to the reception coil, and the like. The power control signal may include a signal for requesting power increase, a signal for requesting power reduction, and the like.

The power transmitting unit 620 may be configured to include a multiplexer 621 (or a multiplexer), a transmitting coil 622, and the like. In addition, the power transmitting unit 620 may further include a carrier generator (not shown) for generating a specific operating frequency for power transmission.

The carrier generator may generate a specific frequency for converting the output DC power of the amplifier 612 delivered via the multiplexer 621 to AC power having a specific frequency. In the above description, the AC signal generated by the carrier generator is mixed with the output of the multiplexer 621 to generate AC power. However, this is only an example, It should be noted that they may be mixed only or later.

The frequency of the AC power transmitted to each of the transmission coils according to an embodiment may be different from each other, and another embodiment may use a predetermined frequency controller having a function of adjusting the LC resonance characteristic for each transmission coil differently, It is also possible to set different resonance frequencies for the respective transmission coils.

However, when the resonant frequencies generated in each of the plurality of transmission coils are different, a separate frequency controller for controlling the resonant frequencies is required, which may increase the size of the wireless power transmitter. Accordingly, in one embodiment, The case where power is transmitted using the same resonance frequency will be described with reference to FIG. 14 to FIG.

6, the power transmission unit 620 includes a multiplexer 621 and a plurality of transmission coils 622 for controlling the output power of the amplifier 612 to be transmitted to the transmission coil, that is, Th to n < th > transmit coils.

The controller 640 according to an embodiment may transmit power by time division multiplexing for each transmission coil when a plurality of wireless power receivers are connected. For example, if the wireless power transmitter 600 has three wireless power receivers-i. E., The first through third wireless power receivers, respectively, identified through three different transmit coils, i. E., First through third transmit coils , The controller 640 controls the multiplexer 621 so that power can be transmitted through a specific transmission coil in a specific time slot. At this time, the amount of power to be transmitted to the corresponding wireless power receiver may be controlled according to the length of the time slot allocated for each transmission coil, but this is only one embodiment. The amplification factor of the amplifier 612 may be controlled to control the transmission power of each wireless power receiver.

The control unit 640 may control the multiplexer 621 so that the detection signals may be sequentially transmitted through the first through n'th transmission coils 622 during the first detection signal transmission procedure. At this time, the control unit 640 can identify the time at which the sensing signal is transmitted using the timer 655. When the sensing signal transmission time arrives, the control unit 640 controls the multiplexer 621 to output a sensing signal It can be controlled to be transmitted. For example, the timer 650 can send a specific event signal to the control unit 640 at predetermined intervals during the ping transmission step. When the event signal is detected, the control unit 640 controls the multiplexer 621 to transmit the corresponding event signal It is possible to control the digital ping to be transmitted through the coil.

In addition, the control unit 640 may transmit a predetermined transmission coil identifier for identifying a signal strength indicator (Signal Strength Indicator) through a transmission coil from the demodulation unit 632 during the first detection signal transmission procedure, Lt; / RTI > received signal strength indicator. In the second sensing signal sending process, the controller 640 controls the multiplexer 621 so that the sensing signal can be transmitted only through the transmitting coil (s) on which the signal strength indicator is received during the first sensing signal sending procedure You may. In another example, when there are a plurality of transmit coils in which the signal strength indicator is received during the first differential sense signal transmission procedure, the control unit 640 transmits the received transmit coil with the signal strength indicator having the largest value as the second differential sense signal In the procedure, the detection signal may be determined as a transmission coil to be transmitted first, and the multiplexer 621 may be controlled according to the determination result.

The modulator 631 may modulate the control signal generated by the controller 640 and transmit the modulated control signal to the multiplexer 621. Here, the modulation scheme for modulating the control signal includes a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a phase shift keying (PSK) modulation scheme, a pulse width modulation scheme, A differential bi-phase modulation method, and the like.

The demodulator 632 can demodulate the detected signal and transmit the demodulated signal to the controller 640 when a signal received through the transmission coil is detected. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge indicator (EOC), an overvoltage / overcurrent / overheat indicator, But is not limited to, various status information for identifying the status of the wireless power receiver.

Also, the demodulator 632 can identify which of the transmit coils the demodulated signal is received, and provide the control unit 640 with a predetermined transmit coil identifier corresponding to the identified transmit coil.

 The demodulation unit 632 can demodulate the signal received through the transmission coil 623 and transmit the demodulated signal to the control unit 640. In one example, the demodulated signal may include, but is not limited to, a signal strength indicator, and the demodulated signal may include various status information of the wireless power receiver.

In one example, the wireless power transmitter 600 may obtain the signal strength indicator through in-band communication that uses the same frequency used for wireless power transmission to communicate with the wireless power receiver.

In addition, the wireless power transmitter 600 can transmit wireless power using the transmit coil 622, as well as exchange various information with the wireless power receiver via the transmit coil 622. As another example, the wireless power transmitter 600 may further include a separate coil corresponding to each of the transmission coils 622 (i.e., the first to n < th > transmission coils) It should be noted that it may also perform in-band communication with the receiver.

Although the wireless power transmitter 600 and the wireless power receiver perform in-band communication in the description of FIG. 6, this is merely an example, and the frequency band used for the wireless power signal transmission Directional communication through different frequency bands. For example, the near-end bi-directional communication may be any one of low-power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.

In particular, the wireless power transmitter 600 according to one embodiment may adaptively provide a fast charge mode and a general low power charge mode at the request of the wireless power receiver.

The wireless power transmitter 600 can transmit a signal of a predetermined pattern, which is called a first packet for convenience of explanation, when the fast charge mode is supported. The wireless power receiver 600 may identify that the wireless power transmitter 600 being connected is capable of fast charge when the first packet is received.

In particular, the wireless power receiver may send a first response packet to the wireless power transmitter 600 requesting fast charging if fast charging is required.

In particular, the wireless power transmitter 600 may automatically switch to the fast charge mode and initiate fast charge when a predetermined time has elapsed after the first response packet is received.

For example, when the control unit 640 of the wireless power transmitter 600 transits to the power transmission step 440 or 540 of FIGS. 4 through 5, the control unit 640 controls the first packet to be transmitted through the transmission coil 622 However, this is only one example, and another example of the present invention may be the first packet sent out in the identification and configuration step 430 of FIG. 4 or the identifying step 530 of FIG.

It should be noted that another embodiment may transmit encoded information that can identify whether or not fast charge support is available to the digital ping signal transmitted by the wireless power transmitter 600. [

The wireless power receiver may send a predetermined charge mode packet to the wireless power transmitter 600 where the charge mode is set to fast charge if a fast charge is needed at any point in the power transfer phase. Here, the details of the configuration of the charge mode packet will be clarified through the description of FIGS. 7 to 11 to be described later. Of course, the wireless power transmitter 600 and the wireless power receiver can control the internal operation so that power corresponding to the fast charge mode can be sent and received when the charge mode is changed to the fast charge mode. For example, when the charging mode is changed from the normal low-power charging mode to the fast-charging mode, the overvoltage determination criterion, the over temperature criterion, the low-voltage / high- Level (Optimum Voltage Level), power control offset, and the like can be changed and set.

For example, when the charging mode is changed from the normal low-power charging mode to the fast-charging mode, the threshold voltage for determining the overvoltage may be set to be high enough to enable fast charging. As another example, the critical temperature for determining whether overheating occurs may be set high considering the temperature rise due to fast charging. As another example, the power control offset value, which means the minimum level at which the power at the transmitter is controlled, may be set to a larger value than the general low-power charging mode so that it can converge quickly to the desired target power level in the fast-charge mode.

7 is a diagram for explaining a packet format according to an electromagnetic induction wireless power transmission procedure according to an embodiment.

Referring to FIG. 7, a packet format 700 used for information exchange between a wireless power transmitter and a wireless power receiver includes a preamble (preamble) 710 for acquiring synchronization for demodulating the packet and identifying an accurate start bit of the packet, A header field 720 for identifying a type of a message included in the packet, a message 730 field for transmitting the contents of the packet (or payload) And a checksum (740) field for identifying whether or not an error has occurred.

As shown in FIG. 7, the packet receiver may identify the size of the message 730 included in the packet based on the header 720 value.

In addition, the header 720 may be defined for each step of the wireless power transmission procedure, and some values of the header 720 may be defined at different steps. For example, referring to FIG. 7, it should be noted that the header value corresponding to the end power transfer in the ping phase and the power transfer termination in the power transfer phase may be equal to 0x02.

The message 730 includes data to be transmitted at the transmitter of the packet. For example, the data contained in the message 730 field may be, but is not limited to, a report, a request, or a response to the other party.

The packet 700 according to another embodiment may further include at least one of transmitter identification information for identifying a transmitter that transmitted the packet and receiver identification information for identifying a receiver to receive the packet. Here, the transmitter identification information and the receiver identification information may include IP address information, MAC address information, product identification information, and the like. However, the present invention is not limited thereto, and information that can distinguish the receiver and the transmitter on the wireless charging system is sufficient.

The packet 700 according to another embodiment may further include predetermined group identification information for identifying a corresponding receiving group when the packet is to be received by a plurality of apparatuses.

FIG. 8 is a diagram for explaining the types of packets that the wireless power receiving apparatus according to the electromagnetic induction-type wireless power transmission procedure according to one embodiment can transmit in the ping stage.

8, the wireless power receiving apparatus can transmit a signal strength packet or a power transmission stop packet in the short-ranging step.

Referring to reference numeral 801 in FIG. 8, a message format of a signal strength packet according to an exemplary embodiment may include a signal strength value having a size of 1 byte. The signal strength value may indicate the degree of coupling between the transmitting coil and the receiving coil and may be calculated based on the rectifier output voltage in the digital ping section, the open circuit voltage measured in the output blocking switch, Lt; / RTI > The signal strength value may range from a minimum of 0 to a maximum of 255 and may have a value of 255 if the actual measured value for a particular variable is equal to the maximum value of that variable (Umax).

For example, the signal strength value may be calculated as U / Umax * 256.

Referring to FIG. 8, the message format of the power transmission stop packet according to an exemplary embodiment may include an end power transfer code having a size of 1 byte.

The reasons why the wireless power receiving apparatus requests the wireless power transmitter to stop the power transmission include charging completion, internal fault, overtemperature, overvoltage, overcurrent, battery But is not limited to, Battery Failure, Reconfigure, and No Response. It should be noted that the power transmission interruption code may be further defined in response to each new power transmission interruption reason.

Charging complete can be used to indicate that the charging of the receiver battery is complete. Internal errors can be used when a software or logical error in the internal operation of the receiver is detected.

Overheating / overvoltage / overcurrent can be used when the measured temperature / voltage / current value at the receiver exceeds the defined threshold for each.

Battery damage can be used if it is determined that there is a problem with the receiver battery.

Reconfiguration can be used when renegotiation is required for power transmission conditions. No response can be used if the transmitter's response to the control error packet - meaning increasing or decreasing the strength of the power - is judged to be unhealthy.

9 is a diagram for explaining a message format of an identification packet according to an electromagnetic induction wireless power transmission procedure according to an embodiment.

9, the message format of the identification packet includes a Version Information field, a Manufacturer Information field, an Extension Indicator field, and a Basic Device Identification Information field Lt; / RTI >

In the version information field, revision version information of a standard applied to the wireless power receiving apparatus can be recorded.

In the manufacturer information field, a predetermined identification code for identifying the manufacturer of the wireless power receiving apparatus may be recorded.

The extension indicator field may be an indicator for identifying whether an extended identification packet including the extended device identification information exists. For example, if the value of the extension indicator is 0, it means that there is no extension identification packet, and if the extension indicator value is 1, it means that the extension identification packet exists after the identification packet.

Referring to reference numerals 901 to 902, if the extension indicator value is 0, the device identifier for the corresponding wireless power receiver may be a combination of manufacturer information and basic device identification information. On the other hand, if the extension indicator value is 1, the device identifier for the wireless power receiver may be a combination of manufacturer information, basic device identification information, and extended device identification information.

10 is a diagram for explaining a message format of a configuration packet and a power control hold packet according to an electromagnetic induction wireless power transmission procedure according to an embodiment.

10, the message format of the configuration packet may have a length of 5 bytes, and may include a power class field, a maximum power field, a power control field, A count field, a window size field, a window offset field, and the like.

The power rating field may record the power rating assigned to the wireless power receiver.

The maximum power field may record the intensity value of the maximum power that can be provided at the rectifier output of the wireless power receiver.

For example, when the power level is a and the maximum power is b, the maximum power amount Pmax desired to be provided at the rectifier output of the wireless power receiving apparatus can be calculated as (b / 2) * 10a.

The power control field can be used to indicate which algorithm should be used to control the power in the wireless power transmitter. For example, if the power control field value is 0, it implies applying the power control algorithm defined in the standard, and if the power control field value is 1, it means that the power control is performed according to the algorithm defined by the manufacturer.

The count field may be used to record the number of option configuration packets that the wireless power receiving device will send in the identification and configuration phase.

The window size field may be used to record the window size for calculating the average received power. As an example, the window size may be a positive integer value that is greater than zero and has a unit of 4 ms.

In the window offset field, information for identifying the time from the end of the average reception power calculation window to the transmission start point of the next received power packet may be recorded. In one example, the window offset may be a positive integer value greater than zero and in units of 4 ms.

Referring to reference numeral 1002, the message format of the power control hold packet may be configured to include a power control hold time (T_delay). A plurality of power control hold packets may be transmitted during the identification and configuration phase. For example, up to seven power control pending packets may be transmitted. The power control hold time (T_delay) may have a value between a predefined power control hold minimum time (T_min: 5 ms) and a power control hold maximum time (T_max: 205 ms). The wireless power transmission apparatus can perform power control using the power control retention time of the power control retention packet last received in the identification and configuration step. Also, the wireless power transmission apparatus can use the T_min value as the T_delay value when the power control hold packet is not received in the identification and configuration step.

The power control retention time may refer to the time that the wireless power transmission apparatus should wait without performing the power control before performing the actual power control after receiving the latest control error packet.

11 is a diagram for explaining a type of a packet that can be transmitted in a power transmission step and a message format thereof by a wireless power receiving apparatus according to an electromagnetic induction wireless power transmission procedure according to an embodiment.

Referring to FIG. 11, in the power transmission step, a packet that can be transmitted by the wireless power receiving apparatus includes a control error packet, an end power transfer packet, a received power packet, A packet (Charge Status Packet), a packet defined by a manufacturer, and the like.

Reference numeral 1101 denotes a message format of a control error packet composed of a 1-byte control error value. Here, the control error value may be an integer value ranging from -128 to +127. If the control error value is negative, the transmission power of the radio power transmission apparatus decreases, and if it is positive, the transmission power of the radio power transmission apparatus can be increased.

Reference numeral 1102 denotes a message format of a control error packet composed of a 1-byte end power transfer code.

Reference numeral 1103 denotes a message format of a received power packet including a 1-byte received power value. Here, the received power value may correspond to the average rectifier received power value calculated during a predetermined period. The actual received power amount Preceived can be calculated based on the maximum power and the power class included in the configuration packet 1001. [ As an example, the actual amount of power received can be calculated by (received power value / 128) * (maximum power / 2) * (10 power rating).

Reference numeral 1104 denotes a message format of a Charge Status Packet consisting of a 1-byte Charge Status Value. The charge state value may indicate the battery charge amount of the wireless power receiving device. For example, the charge state value 0 means a completely discharged state, the charge state value 50 may mean a 50% charge state, and the charge state value 100 may mean a full charge state. If the wireless power receiving device does not include a rechargeable battery or can not provide charge state information, the charge state value may be set to OxFF.

12 is a view for explaining the arrangement of a plurality of transmission coils and the distance to a shielding member according to an embodiment.

Referring to FIG. 12, three transmission coils can be arranged. At least one of the plurality of transmission coils may be disposed in an overlapped manner in order to perform a uniform power transmission within a constant sized charging area. 12, the first coil 1210 and the second coil 1220 are disposed on the first layer side by side at a predetermined interval on the shielding member 1240, and the third coil 1230 is disposed on the first coil and the second coil And can be superimposed on the second layer.

The first coil 1210, the second coil 1220 and the third coil 1230 may be manufactured according to the specifications of the coils defined in WPC or PMA and may be manufactured to the same extent can do.

For example, the transmit coil may have the specifications shown in Table 1 below.

parameter symbol value The outer length dol 53.2 ± 0.5 mm Inner length language 27.5 ± 0.5 mm The outer width dow 45.2 ± 0.5 mm Inner width diw 19.5 ± 0.5 mm Thickness dc 1.5 ± 0.5 mm Number of turns per layer N 12 turns Number of layers One

The first coil 1210, the second coil 1220, and the third coil 1230 correspond to the outer length defined in Table 1, Length, outer width, inner width, thickness, and width. Of course, the first coil 1210, the second coil 1220, and the third coil 1230 may have the same physical characteristics within an error range by the same manufacturing process.

12, each of the first coil 1210, the second coil 1220, and the third coil 1230 may have different values of inductance measured depending on positions where the first coil 1210, the second coil 1220, and the third coil 1230 are disposed in relation to the shielding material.

For example, the first coil 1210 and the second coil 1220 satisfy the specifications of Table 1 and have an inductance of 12.5 uH. The third coil 1230 is spaced apart from the shielding member by a distance May have an inductance that is less than 12.5 uH different from the first coil 1210 and the second coil 1220.

For example, the first coil 1210 and the second coil 1220 are disposed in contact with the shielding material, while the third coil 1230 may be disposed apart from the shielding material by a predetermined height.

In one embodiment, an adhesive may be disposed between the first coil 1210, the second coil 1220, or the third coil 1230 and the shielding material.

Therefore, in an embodiment, the third coil 1230 may have a larger number of turns than the turns of the first coil 1210 and the second coil 1220 to have the same inductance as the first coil 1210 and the second coil 1220, (For example, 0.5 times or 1 time or 2 times).

In one embodiment, the third coil 1230 may have 12.5 times or 13 times or 14 times of turns.

In one embodiment, when the third coil 1230 has several more turns than the first coil 1230 and the second coil 1220, the outer length, outer width, and thickness are the same, The width can be different.

In one embodiment, when the third coil 1230 has several more turns than the first coil 1230 and the second coil 1220, the inner length, inner width, and thickness are the same, The width can be different.

In one embodiment, when the third coil 1230 has several more turns than the first coil 1230 and the second coil 1220, the outer length, outer width, inner width, The length can be different.

In one embodiment, when the third coil 1230 has several more turns than the first coil 1230 and the second coil 1220, the outer length, outer width, inner length, The width can be different.

In one embodiment, when the third coil 1230 has several more turns than the first coil 1230 and the second coil 1220, the outer width, inner length, inner width, The length can be different.

In one embodiment, in the case where the third coil 1230 has several more turns than the first coil 1230 and the second coil 1220, the outer length, the inner length, the inner width, The width can be different.

In other words, the centrally located third coil 1230 is located farther from the shield than the first coil 1210 and the second coil 1220, and the measured inductance is greater than the inductance of the first coil 1210 and the second coil 1220 And the length of the conductor constituting the third coil 1230 may be made longer than that of the first coil 1210 and the second coil 1220 to adjust the inductance to be the same.

The length of the wire constituting the third coil 1230 is made slightly longer than that of the first coil 1210 and the second coil 1220 so that the third coil 1230 is connected to the first coil 1230, The inductance of the three coils may be equal to 12.5uH, although they are located farther from the shield than the second coil 1220. In one embodiment, the coils' inductance is equal to an error within +/- 0.5uH Range. ≪ / RTI >

As the distance from the shielding material to the shielding coils increases, the measured inductance of the transmission coil overlaps with the shielding material. The longer the distance to the shielding material, the longer the length of the transmission coil to increase the inductance.

When the inductances of the first coil 1210, the second coil 1220 and the third coil 1230 are different from each other, a resonance circuit including capacitors different from each other depending on inductances and a resonance circuit May be required for each drive circuit.

13 shows a wireless power transmitter including a plurality of shielding members according to an embodiment.

Referring to FIG. 13, the wireless power transmitter may include a plurality of transmission coils 1301 to 1303. For example, the wireless power transmitter may include a first transmit coil 1301, a second transmit coil 1302, and a third transmit coil 1303. The distance between the second transmission coil 1302 and the plurality of shielding materials 1304 to 1306 and the distance between the first transmission coil 1301 and the third transmission coil 1303 and the plurality of shielding materials 1304 to 1306 The distance may vary. The inductance value of the second transmission coil 1302 may be smaller than the inductance value of the first transmission coil 1301 and the third transmission coil 1303 due to the difference in the separation distance. In order to compensate for the difference in inductance value between the plurality of transmission coils 1301 to 1303, the wireless power transmitter may include a plurality of shielding materials 1304 to 1306 having different magnetic permeability.

The plurality of shielding members 1304 to 1306 according to the embodiment may be disposed below the plurality of transmission coils 1301 to 1303. Alternatively, the plurality of shielding materials 1304 to 1306 may be disposed closely to the lower surfaces of the plurality of transmission coils 1301 to 1303. At least one transmission coil of the plurality of transmission coils 1301 to 1303 may have an inductance value different from at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 1304 to 1306 may have a permeability corresponding to the inductance value.

The first transmission coil 1301 and the third transmission coil 1903 may be disposed on the upper surface or the upper surface of the plurality of shielding materials 1304 to 1306 on the same plane. The second transmission coil 1302 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 1302 and a portion of the upper surface or the upper portion of the third transmission coil 1303. [

The plurality of shielding materials may include a first shielding material 1304, a second shielding material 1305, and a third shielding material 1306 disposed on the same plane. The second shielding member 1305 may be disposed between the first shielding member 1304 and the third shielding member 1306. The first transmission coil 1301 may be disposed on a part of the upper surface of the first shielding material 1304 and a part of the upper surface or the upper surface of the second shielding material 1305. The third transmission coil 1303 may be disposed on a portion of the upper surface or the upper portion of the second shielding material 1305 and a portion of the upper surface or the upper portion of the third shielding material 1306. The magnetic permeability of the first shielding material 1304 and the third shielding material 1306 may be the same. The permeability of the second shielding material 1305 may exceed the permeability of the first shielding material 1304 and the third shielding material 1306.

The inductive induction coefficient (inductance) of the second transmission coil 1302 and the plurality of shielding materials is determined by the self induction coefficient (inductance) of the first transmission coil 1301 and the plurality of shielding materials, Can be the same. The self induction coefficient (inductance) of the second transmission coil 1302 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 1303 and the plurality of shielding materials.

The length 1305-1 of the second shielding member 1305 in the lateral direction may be equal to the length dol of the width of the second transmission coil 1302 in the lateral direction. That is, the length 1305-1 of the second shielding member 1305 in the transverse direction is equal to the length 1304-1 of the first shielding member 1304 in the transverse direction and the length 1304-1 in the transverse direction of the third shielding member 1306 May be greater than the length 1306-1 of width.

The length of the second shielding member 1305 in the vertical direction may be the same as the length dow in the vertical direction of the second transmission coil 1302. The length of the longitudinal width of the first shielding member 1304 or the length of the longitudinal direction of the third shielding member 1306 is determined by the length dow of the outer longitudinal width of the first transmission coil 1301, May be the same as the length (dow) of the outer longitudinal width of the third transmission coil 1303.

The length of the second shielding member 1305 in the vertical direction is determined by the length dow in the vertical direction of the first shielding member 1304 and the length dow in the vertical direction of the second shielding member 1306, ). ≪ / RTI >

14 shows a wireless power transmitter including a plurality of shielding members according to another embodiment.

Referring to FIG. 14, the wireless power transmitter may include a plurality of transmission coils 1401 to 1403. For example, the wireless power transmitter may include a first transmit coil 1401, a second transmit coil 1402, and a third transmit coil 1403. The distance between the second transmission coil 1402 and the plurality of shielding materials 1404 to 1406 and the distance between the first transmission coil 1401 and the third transmission coil 1403 and the plurality of shielding materials 1404 to 1406 The distance may vary. The inductance value of the second transmission coil 1402 may be smaller than the inductance value of the first transmission coil 1401 and the third transmission coil 1403 due to the difference in the separation distance. In order to compensate for the difference in inductance value between the plurality of transmission coils 1401 to 1403, the wireless power transmitter may include a plurality of shielding materials 1404 to 1406 having different magnetic permeability.

The plurality of shielding members 1404 to 1406 according to the embodiment may be disposed below the plurality of transmission coils 1401 to 1403. Alternatively, the plurality of shielding members 1404 to 1406 may be disposed closely to the lower surfaces of the plurality of transmission coils 1401 to 1403. At least one transmission coil of the plurality of transmission coils 1401 to 1403 may have an inductance value different from at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 1404 to 1406 may have a permeability corresponding to the inductance value.

The first transmission coil 1401 and the third transmission coil 1403 may be disposed on the upper surface or the upper surface of the plurality of shielding materials 1404 to 1406 on the same plane. The second transmission coil 1402 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 1402 and a portion of the upper surface or the upper portion of the third transmission coil 1403. [

The plurality of shielding materials may include a first shielding material 1404, a second shielding material 1405, and a third shielding material 1406 disposed on the same plane. The second shielding material 1405 may be disposed between the first shielding material 1404 and the third shielding material 1406. The first transmission coil 1401 may be disposed on a part of the upper surface of the first shielding material 1404 and a part of the upper surface or the upper surface of the second shielding material 1405. The third transmission coil 1403 may be disposed on a portion of the upper surface or the upper portion of the second shielding material 1405 and a portion of the upper surface or the upper portion of the third shielding material 1406. The magnetic permeability of the first shielding material 1404 and the third shielding material 1406 may be the same. The permeability of the second shielding material 1405 may exceed the permeability of the first shielding material 1404 and the third shielding material 1406. [

The inductive induction coefficient (inductance) of the second transmission coil 1402 and the plurality of shielding materials is determined by the self-induction coefficient (inductance) of the first transmission coil 1401 and the plurality of shielding materials, Can be the same. In addition, the self-induction coefficient (inductance) of the second transmission coil 1402 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 1403 and the plurality of shielding materials.

The length 1405-1 of the second shielding member 1405 in the transverse direction may exceed the length dol of the width of the second transmission coil 1402 in the transverse direction. The length 1404-1 of the first shielding member 1404 in the transverse direction or the length 1406-1 of the width of the third shielding member 1406 in the transverse direction may be longer than the length 1404-1 of the first transmission coil 1401 May be less than the length (dol) of the transverse direction width or the length (dol) of the outer transverse direction width of the third transmission coil 1403. That is, the length 1405-1 of the second shielding material 1405 in the transverse direction is equal to the length 1404-1 in the transverse direction of the first shielding material 1404 and the length 1404-1 in the transverse direction of the second shielding material 1406 May be greater than the length 1405-1 of the width.

In addition, the length 1405-1 of the second shielding member 1405 in the longitudinal direction may exceed the length dol of the width of the outside of the second transmission coil 1402 in the longitudinal direction. The length of the first shielding member 1404 or the third shielding member 1406 in the vertical direction may be equal to the length dow of the outer longitudinal width of the first transmission coil 1301 or the length dow of the third transmission coil 1303 (Dow) of the outer widthwise width of the outer side of the outer side of the outer side.

The length of the second shielding member 1405 in the longitudinal direction may be less than the length of the first shielding member 1404 in the longitudinal direction and the length in the longitudinal direction of the second shielding member 1406.

FIG. 15 illustrates a wireless power transmitter including a plurality of shielding members according to another embodiment.

Referring to FIG. 15, the wireless power transmitter may include a plurality of transmission coils 1501 to 1503. For example, the wireless power transmitter may include a first transmit coil 1501, a second transmit coil 1502, and a third transmit coil 1503. The distance between the second transmission coil 1502 and the plurality of shielding materials 1504 to 1506 and the distance between the first transmission coil 1501 and the third transmission coil 1503 and the plurality of shielding materials 1504 to 1506 The distance may vary. The inductance value of the second transmission coil 1502 may be smaller than the inductance value of the first transmission coil 1501 and the third transmission coil 1503 due to the difference in the separation distance. In order to compensate for the difference in inductance value between the plurality of transmission coils 1501 to 1503, the wireless power transmitter may include a plurality of shielding materials 1504 to 1506 having different magnetic permeability.

The plurality of shielding members 1504 to 1506 according to the embodiment may be disposed below the plurality of transmission coils 1501 to 1503. Alternatively, the plurality of shielding members 1504 to 1506 may be disposed closely to the lower surfaces of the plurality of transmission coils 1501 to 1503. At least one of the plurality of transmission coils 1501 to 1503 may have an inductance value different from that of at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 1504 to 1506 may have a permeability corresponding to the inductance value.

The first transmission coil 1501 and the third transmission coil 1503 may be disposed on the upper surface or the upper surface of the plurality of shielding materials 1504 to 1506 on the same plane. The second transmission coil 1502 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 1502 and a portion of the upper surface or the upper portion of the third transmission coil 1503.

The plurality of shielding materials may include a first shielding material 1504, a second shielding material 1505, and a third shielding material 1506 disposed on the same plane. The second shielding member 1505 may be disposed between the first shielding member 1504 and the third shielding member 1506. The first transmission coil 1501 may be disposed on a portion of the upper surface of the first shielding material 1504 and a portion of the upper surface or the upper portion of the second shielding material 1505. The third transmission coil 1503 may be disposed on an upper surface or a portion of the second shielding material 1505 and a portion of the upper surface or the upper surface of the third shielding material 1506. The magnetic permeability of the first shielding material 1504 and the third shielding material 1506 may be the same. The magnetic permeability of the second shielding material 1505 may exceed the magnetic permeability of the first shielding material 1504 and the third shielding material 1506.

The inductive induction coefficient (inductance) of the second transmission coil 1502 and the plurality of shielding materials is determined by the first transmission coil 1501 and the self induction coefficient (inductance) of the plurality of shielding materials Can be the same. In addition, the self induction coefficient (inductance) of the second transmission coil 1502 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 1303 and the plurality of shielding materials.

The second shielding member 1505 according to the embodiment has a width 1505-1 in the transverse direction of the outer side of the inner side coil of the right end section of the cross section of the first transmission coil 1501, 1503 of the left end face of the coil.

The first shielding member 1504 may be disposed such that the width 1504-1 of the first shielding member 1504 is less than the outer periphery of the coil of the right end section of the first transmission coil 1501. [ The third shielding member 1506 according to the embodiment may be disposed such that the width 1506-1 in the lateral direction is less than the outer periphery of the inner side coil of the left end face of the third transmission coil 1503 have.

16 illustrates a wireless power transmitter including a plurality of shielding members according to yet another embodiment.

Referring to FIG. 16, the wireless power transmitter may include a plurality of transmission coils 1601 to 1603. For example, the wireless power transmitter may include a first transmit coil 1601, a second transmit coil 1602, and a third transmit coil 1603. A distance between the second transmission coil 1602 and the plurality of shielding materials 1604 to 1606 and a distance between the first transmission coil 1601 and the third transmission coil 1603 and the plurality of shielding materials 1604 to 1606 The distance may vary. The inductance value of the second transmission coil 1602 may be smaller than the inductance value of the first transmission coil 1601 and the third transmission coil 1603 due to the difference in the separation distance. In order to compensate for the difference in inductance value between the plurality of transmission coils 1601 to 1603, the wireless power transmitter may include a plurality of shielding materials 1604 to 1606 having different magnetic permeability.

The plurality of shielding members 1604 to 1606 according to the embodiment may be disposed below the plurality of transmission coils 1601 to 1603. Alternatively, the plurality of shielding members 1604 to 1606 may be disposed closely to the lower surfaces of the plurality of transmission coils 1601 to 1603. At least one of the plurality of transmission coils 1601 to 1603 may have an inductance value different from the at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 1604 to 1606 may have a permeability corresponding to the inductance value.

The first transmission coil 1601 and the third transmission coil 1603 may be disposed on the upper surface or the upper surface of the plurality of shielding materials 1604 to 1606 on the same plane. The second transmission coil 1602 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 1602 and a portion of the upper surface or the upper portion of the third transmission coil 1603.

The plurality of shielding materials may include a first shielding material 1604, a second shielding material 1605, and a third shielding material 1606 disposed on the same plane. The second shielding material 1605 may be disposed between the first shielding material 1604 and the third shielding material 1606. The first transmission coil 1601 may be disposed on a portion of the upper surface of the first shielding material 1604 and a portion of the upper surface or the upper portion of the second shielding material 1605. The third transmission coil 1603 may be disposed on a portion of the upper surface or the upper portion of the second shielding material 1605 and a portion of the upper surface or the upper portion of the third shielding material 1606. The magnetic permeability of the first shielding material 1604 and the third shielding material 1606 may be the same. The permeability of the second shielding material 1605 may exceed the permeability of the first shielding material 1604 and the third shielding material 1606.

The inductive induction coefficient (inductance) of the second transmission coil 1602 and the plurality of shielding materials is determined by the self induction coefficient (inductance) of the first transmission coil 1601 and the plurality of shielding materials, Can be the same. The self induction coefficient (inductance) of the second transmission coil 1602 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 1603 and the plurality of shielding materials.

The second shielding member 1605 according to the embodiment has a width 1605-1 in the lateral direction of the outer side of the inner coil of the right end section of the cross section of the first transmission coil 1601, 1603 may be arranged so as to correspond to the inner periphery of the coil of the left end face of the end face.

17 illustrates a wireless power transmitter including a plurality of shielding members according to yet another embodiment.

Referring to FIG. 17, the wireless power transmitter may include a plurality of transmission coils 1701 to 1703. For example, the wireless power transmitter may include a first transmit coil 1701, a second transmit coil 1702, and a third transmit coil 1703. The distance between the second transmission coil 1702 and the plurality of shielding materials 1704 to 1706 and the distance between the first transmission coil 1701 and the third transmission coil 1703 and the plurality of shielding materials 1704 to 1706 The distance may vary. The inductance value of the second transmission coil 1702 may be smaller than the inductance value of the first transmission coil 1701 and the third transmission coil 1703 due to the difference in the separation distance. In order to compensate for the difference in inductance value between the plurality of transmission coils 1701 to 1703, the wireless power transmitter may include a plurality of shielding materials 1704 to 1706 having different magnetic permeability.

The plurality of shielding materials 1704 to 1706 according to the embodiment may be disposed below the plurality of transmission coils 1701 to 1703. Alternatively, the plurality of shielding materials 1704 to 1706 may be disposed closely to the lower surfaces of the plurality of transmission coils 1701 to 1703. At least one of the plurality of transmission coils 1701 to 1703 may have an inductance value different from the at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 1704 to 1706 may have a permeability corresponding to the inductance value.

The first transmission coil 1701 and the third transmission coil 1703 may be disposed on the upper surface or the upper surface of the plurality of shielding materials 1704 to 1706 on the same plane. The second transmission coil 1702 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 1702 and a portion of the upper surface or the upper portion of the third transmission coil 1703. [

The plurality of shielding materials may include a first shielding material 1704, a second shielding material 1705, and a third shielding material 1706 disposed on the same plane. The second shielding material 1705 may be disposed between the first shielding material 1704 and the third shielding material 1706. The first transmission coil 1701 may be disposed on a portion of the upper surface of the first shielding material 1704 and a portion of the upper surface or the upper portion of the second shielding material 1705. The third transmission coil 1703 may be disposed on a portion of the upper surface or the upper portion of the second shielding material 1705 and a portion of the upper surface or the upper portion of the third shielding material 1706. The magnetic permeability of the first shielding material 1704 and the third shielding material 1706 may be the same. The permeability of the second shielding material 1705 may exceed the permeability of the first shielding material 1704 and the third shielding material 1706.

The inductive induction coefficient (inductance) of the second transmission coil 1702 and the plurality of shielding materials is determined by the self-induction coefficient (inductance) of the first transmission coil 1701 and the plurality of shielding materials, Can be the same. In addition, the self induction coefficient (inductance) of the second transmission coil 1702 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 1703 and the plurality of shielding materials.

The second shielding material 1705 according to the embodiment may be arranged such that the length 1705-1 of the transverse width corresponds to the inner boundary of the second transmission coil 1702. [ That is, the length 1705-1 of the second shielding material 1705 in the transverse direction is equal to the length 1704-1 in the transverse direction of the first shielding material 1704 and the length 1704-1 in the transverse direction of the third shielding material 1706 May be less than the length 1706-1 of the width.

18 shows a wireless power transmitter including a plurality of shielding members according to yet another embodiment.

Referring to FIG. 18, the wireless power transmitter may include a plurality of transmission coils 1801 to 1803. For example, the wireless power transmitter may include a first transmit coil 1801, a second transmit coil 1802, and a third transmit coil 1803. The distance between the second transmission coil 1802 and the plurality of shielding materials 1804 to 1806 and the distance between the first transmission coil 1801 and the third transmission coil 1803 and the plurality of shielding materials 1804 to 1806 The distance may vary. The inductance value of the second transmission coil 1802 may be smaller than the inductance value of the first transmission coil 1801 and the third transmission coil 1803 due to the difference in the separation distance. In order to compensate for the difference in inductance value between the plurality of transmission coils 1801 to 1803, the wireless power transmitter may include a plurality of shielding materials 1804 to 1806 having different magnetic permeability.

The plurality of shielding members 1804 to 1806 according to the embodiment may be disposed below the plurality of transmission coils 1801 to 1803. Alternatively, the plurality of shielding members 1804 to 1806 may be disposed closely to the lower surfaces of the plurality of transmission coils 1801 to 1803. At least one of the plurality of transmission coils 1801 to 1803 may have an inductance value different from the at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 1804 to 1806 may have a permeability corresponding to the inductance value.

The first transmission coil 1801 and the third transmission coil 1803 may be disposed on the upper surface or the upper surface of the plurality of shielding materials 1804 to 1806 on the same plane. The second transmission coil 1802 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 1802 and a portion of the upper surface or the upper portion of the third transmission coil 1803.

The plurality of shielding materials may include a first shielding material 1804, a second shielding material 1805, and a third shielding material 1806 disposed on the same plane. The second shielding member 1805 may be disposed between the first shielding member 1804 and the third shielding member 1806. The first transmission coil 1801 may be disposed on a part of the upper surface of the first shielding material 1804 and a part of the upper surface or the upper part of the second shielding material 1805. The third transmission coil 1803 may be disposed on a portion of the upper surface or the upper portion of the second shielding material 1805 and a portion of the upper surface or the upper portion of the third shielding material 1806. The magnetic permeability of the first shielding material 1804 and the third shielding material 1806 may be the same. The permeability of the second shielding material 1805 may exceed the permeability of the first shielding material 1804 and the third shielding material 1806.

The inductive induction coefficient (inductance) of the second transmission coil 1802 and the plurality of shielding materials is determined by the self-induction coefficient (inductance) of the first transmission coil 1801 and the plurality of shielding materials, Can be the same. The self-induction coefficient (inductance) of the second transmission coil 1802 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 1803 and the plurality of shielding materials.

The second shielding member 1805 may be disposed such that the length 1805-1 of the transverse width does not exceed the inner boundary of the second transmission coil 1802. [ That is, the length 1805-1 of the horizontal width of the second shielding material 1805 may be smaller than the length between the inner boundaries of the second transmission coil 1802.

19 shows a wireless power transmitter including a plurality of shielding materials having different permeability according to another embodiment.

The plurality of shielding members 1904 to 1906 according to the embodiment may be disposed below the plurality of transmission coils 1901 to 1903. Alternatively, the plurality of shielding members 1904 to 1906 may be disposed closely to the lower surfaces of the plurality of transmission coils 1901 to 1903. At least one of the plurality of transmission coils 1901 to 1903 may have an inductance value different from the at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 1904 to 1906 may have a permeability corresponding to the inductance value.

For example, the plurality of transmit coils may include a first transmit coil 1901, a second transmit coil 1902, and a third transmit coil 1903. The first transmission coil 1901 and the third transmission coil 1903 may be disposed on the upper surface or the upper surface of the plurality of shielding materials 1904 to 1906 on the same plane. The second transmission coil 1902 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 1901 and a portion of the upper surface or the upper portion of the third transmission coil 1903. [

The plurality of shielding materials may include a first shielding material 1904, a second shielding material 1905, and a third shielding material 1906 disposed on the same plane. The second shielding member 1905 may be disposed between the first shielding member 1904 and the third shielding member 1906. The first transmission coil 1901 may be disposed on a portion of the upper surface or the upper portion of the first shielding material 1904 and a portion of the upper surface or the upper portion of the second shielding material 1905. The third transmission coil 1903 may be disposed on a portion of the upper surface or the upper portion of the second shielding material 1905 and a portion of the upper surface or the upper portion of the third shielding material 1906. The magnetic permeability of the first shielding material 1904 and the third shielding material 1906 may be the same. The permeability of the second shielding material 1905 may exceed the permeability of the first shielding material 1904 and the third shielding material 1906.

The plurality of shielding materials according to the embodiment may further include a fourth shielding material 1907 disposed on a lower surface or a lower surface of each of the first shielding material 1904, the second shielding material 1905, and the third shielding material 1906 have. The permeability of the fourth shielding material 1907 may be the same as the permeability of the first shielding material 1904 and the third shielding material 1906.

The magnetic permeability of the fourth shielding material 1907 according to the embodiment may be different from that of the first shielding material 1904, the second shielding material 1905, and the third shielding material 1906.

The inductive induction coefficient (inductance) of the first transmission coil 1901 and the plurality of shielding materials is determined by the second transmission coil 1902, the self induction coefficient (inductance) of the plurality of shielding materials, Can be the same. The self induction coefficient (inductance) of the first transmission coil 1901 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 1903 and the plurality of shielding materials.

20 shows a wireless power transmitter including a plurality of shielding materials having different permeability according to another embodiment.

The plurality of shielding materials 2004 and 2005 according to the embodiment may be disposed below the plurality of transmission coils 2001 to 2003. [ Alternatively, the plurality of shielding materials 2004 and 2005 may be disposed closely to the lower surfaces of the plurality of transmission coils 2001 to 2003. At least one of the plurality of transmission coils 2001 to 2003 may have an inductance value different from the at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 2004 and 2005 may have a magnetic permeability corresponding to the inductance value.

The plurality of transmission coils may include a first transmission coil 2001, a second transmission coil 2002, and a third transmission coil 2003. The second transmission coil 2002 and the third transmission coil 2003 may be disposed on the upper surface or the upper surface of the plurality of shielding materials 2004 and 2005 on the same plane. The second transmission coil 2002 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 2001 and a portion of the upper surface or the upper portion of the third transmission coil 2003. The plurality of shielding materials may include a first shielding material 2004 disposed on a lower surface or a lower surface of the first transmission coil 2001 and the third transmission coil 2003. The plurality of shielding materials may include a second shielding material 2004 disposed between the first transmission coil 2001, the second transmission coil 2002, the third transmission coil 2003 and the first shielding material 2004. ). The second shielding material 2004 may be disposed in an empty space between the first transmission coil 2001, the second transmission coil 2002, the third transmission coil 2003, have.

The magnetic permeability of the first shielding material 2004 and the second shielding material 2005 may be the same. The second shielding material 2005 may be disposed on the upper surface or the upper surface of the first shielding material 2004 on the same plane as the first transmission coil 2001 and the third transmission coil 2003. The height of the second shielding material 2005 may be the same as the height of the first transmission coil 2001 and the third transmission coil 2003.

The inductive induction coefficient (inductance) of the second transmission coil 2002 and the plurality of shielding materials is determined by the first transmission coil 2001 and the self induction coefficient (inductance) of the plurality of shielding materials, Can be the same. The self-induction coefficient (inductance) of the second transmission coil 2002 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 2003 and the plurality of shielding materials.

FIG. 21 illustrates a wireless power transmitter including a plurality of shielding materials having different permeability according to another embodiment.

The plurality of shielding members 2104 and 2105 according to the embodiment may be disposed below or below the plurality of transmission coils 2101 to 2103. For example, the plurality of shielding members 2104 and 2105 may be disposed closely to the lower or lower surface of the plurality of transmission coils 2101 to 2103. At least one transmission coil of the plurality of transmission coils 2101 to 2103 may have an inductance value different from that of at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 2104 and 2105 may have a permeability corresponding to the inductance value.

The plurality of transmission coils may include a first transmission coil 2101, a second transmission coil 2102, and a third transmission coil 2103. The first transmission coil 2101 and the third transmission coil 2103 may be disposed on the upper surface or the upper surface of the plurality of shielding materials 2104 and 2105 on the same plane. The second transmission coil 2102 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 2101 and a portion of the upper surface or the upper portion of the third transmission coil 2103. [ The plurality of shielding materials may include a first shielding material 2104 disposed on a lower surface or a lower surface of the first transmission coil 2101 and the third transmission coil 2103. The plurality of shielding materials may include a second shielding material 2104 disposed between the first transmission coil 2101, the second transmission coil 2102, the third transmission coil 2103 and the first shielding material 2104. ). The second shielding member 2104 may be disposed in a vacant space between the first transmission coil 2101, the second transmission coil 2102, the third transmission coil 2103 and the first shielding member 2104. have.

The second shielding member 2105 may be an adhesive film type shielding material attached to a lower surface or a lower surface of the second transmission coil 2101. The permeability of the second shielding material 2105 may exceed the permeability of the first shielding material 2104. The height of the second shielding material 2105 may be smaller than the height of the first transmission coil 2101 and the third transmission coil 2103.

The inductive induction coefficient (inductance) of the second transmission coil 2102 and the plurality of shielding materials is determined by the first transmission coil 2101 and the self induction coefficient (inductance) of the plurality of shielding materials, Can be the same. The self induction coefficient (inductance) of the second transmission coil 2102 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 2103 and the plurality of shielding materials.

22 is a plurality of shielding materials having different shapes or areas according to the embodiment.

Referring to FIG. 22, a plurality of shielding members 2204 to 2206 according to an embodiment may be disposed on the lower or lower surface of the plurality of transmission coils 2201 to 2203. At this time, the plurality of shielding materials 2204 to 2206 may have a shape and an area corresponding to shapes and areas of the plurality of transmission coils 2201 to 2203.

For example, referring to FIG. 22 (a), the first shielding member 2204 may have an area and a shape corresponding to the area and shape of the first transmission coil 2201. The second shielding member 2205 may have an area and a shape corresponding to the area and shape of the second transmission coil 2202. Similarly, the third shielding member 2205 may have an area and a shape corresponding to the area and shape of the third transmission coil 2203. At this time, referring to FIG. 22B, the plurality of shielding materials 2204 to 2206 may be disposed on the same plane.

The distance between the second transmission coil 2202 and the plurality of shielding materials 2204 to 2206 and the distance between the first transmission coil 2201 and the third transmission coil 2203 and the plurality of shielding materials 2204 to 2206, 2206 may be different. The inductance value of the second transmission coil 2202 may be smaller than the inductance value of the first transmission coil 2201 and the third transmission coil 2203 due to the difference in the separation distance. In order to compensate for the difference in inductance value between the plurality of transmission coils 2201 to 2203, the wireless power transmitter may include a plurality of shielding materials 2204 to 2206 having different magnetic permeability.

The plurality of shielding materials 2204 to 2206 according to the embodiment may be disposed below or below the plurality of transmission coils 2201 to 2203. For example, the plurality of shielding materials 2204 to 2206 may be disposed closely to the lower or lower surface of the plurality of transmission coils 2201 to 2203. At least one transmission coil of the plurality of transmission coils 2201 to 2203 may have an inductance value different from that of at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 2204 to 2206 may have a permeability corresponding to the inductance value.

For example, the plurality of transmission coils may include a first transmission coil 2201, a second transmission coil 2202, and a third transmission coil 2203. The first transmission coil 2201 and the third transmission coil 2203 may be disposed on the upper surface of the plurality of shielding materials 2204 to 2206 on the same plane. The second transmission coil 2202 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 2202 and a portion of the upper surface or the upper portion of the third transmission coil 2203. [

The plurality of shielding materials may include a first shielding material 2204, a second shielding material 2205, and a third shielding material 2206 disposed on the same plane. The second shielding material 2205 may be disposed between the first shielding material 2204 and the third shielding material 2206. The second transmission coil 2201 may be disposed on a part of the upper surface of the first shielding material 2204 and a part of the upper surface or the upper part of the second shielding material 2205. The third transmission coil 2203 may be disposed on a portion of the upper surface or the upper portion of the second shielding material 2205 and a portion of the upper surface or the upper portion of the third shielding material 2206. The magnetic permeability of the first shielding material 2204 and the third shielding material 2206 may be the same. The permeability of the second shielding material 2205 may exceed the permeability of the first shielding material 2204 and the third shielding material 2206.

The inductive induction coefficient (inductance) of the second transmission coil 2202 and the plurality of shielding materials is determined by the self-induction coefficient (inductance) of the first transmission coil 2201 and the plurality of shielding materials, Can be the same. In addition, the self induction coefficient (inductance) of the second transmission coil 2202 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 2203 and the plurality of shielding materials.

23 is a plurality of shielding materials having different shapes or areas according to another embodiment.

Referring to FIG. 23, a plurality of shielding materials 2304 to 2306 according to the embodiment may be disposed on the lower or lower surface of the plurality of transmission coils 2301 to 2303. At this time, the plurality of shielding materials 2304 to 2306 may have a shape and an area corresponding to a shape and an area of the plurality of transmission coils 2301 to 2303.

For example, referring to FIG. 23A, the first shielding member 2304 may have an area and a shape corresponding to the area and shape of the first transmission coil 2301. The second shielding member 2305 may have an area and a shape corresponding to a part of the area and the shape of the second transmission coil 2302. Similarly, the third shielding material 2305 may have an area and a shape corresponding to the area and shape of the third transmission coil 2303. [ For example, the left and right width of the second shielding member 2304 may correspond to an inner boundary line on the right side of the first transmission coil 2301 and an inner boundary line on the left side of the third transmission coil 2303. 23 (b), the plurality of shielding materials 2304 to 2306 may be disposed on the same plane.

The distance between the second transmission coil 2302 and the plurality of shielding materials 2304 to 2306 and the distance between the first transmission coil 2301 and the third transmission coil 2303 and the plurality of shielding materials 2304 to 2306, 2306 may be different. The inductance value of the second transmission coil 2302 may be smaller than the inductance value of the first transmission coil 2301 and the third transmission coil 2303 due to the difference in the separation distance. In order to compensate for the difference in inductance value between the plurality of transmission coils 2301 to 2303, the wireless power transmitter may include a plurality of shielding materials 2304 to 2306 having different magnetic permeability.

The plurality of shielding materials 2304 to 2306 according to the embodiment may be disposed below or below the plurality of transmission coils 2301 to 2303. For example, the plurality of shielding materials 2304 to 2306 may be disposed closely to the lower or the lower surface of the plurality of transmission coils 2301 to 2303. At least one of the plurality of transmission coils 2301 to 2303 may have an inductance value different from the at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 2304 to 2306 may have a permeability corresponding to the inductance value.

For example, the plurality of transmission coils may include a first transmission coil 2301, a second transmission coil 2302, and a third transmission coil 2303. The first transmission coil 2301 and the third transmission coil 2303 may be disposed on the upper surface of the plurality of shielding materials 2304 to 2306 on the same plane. The second transmission coil 2302 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 2302 and a portion of the upper surface or the upper portion of the third transmission coil 2303. [

The plurality of shielding materials may include a first shielding material 2304, a second shielding material 2305, and a third shielding material 2306 disposed on the same plane. The second shielding material 2305 may be disposed between the first shielding material 2304 and the third shielding material 2306. The second transmission coil 2301 may be disposed on a part of the upper surface of the first shielding material 2304 and a part of the upper surface or the upper surface of the second shielding material 2305. The third transmission coil 2303 may be disposed on a portion of the upper surface or the upper portion of the second shielding material 2305 and a portion of the upper surface or the upper portion of the third shielding material 2306. The magnetic permeability of the first shielding material 2304 and the third shielding material 2306 may be the same. The magnetic permeability of the second shielding material 2305 may exceed the magnetic permeability of the first shielding material 2304 and the third shielding material 2306.

The inductive induction coefficient (inductance) of the second transmission coil 2302 and the plurality of shielding materials is determined by the self-induction coefficient (inductance) of the first transmission coil 2301 and the plurality of shielding materials, Can be the same. In addition, the self-induction coefficient (inductance) of the second transmission coil 2302 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 2303 and the plurality of shielding materials.

24 is a plurality of shielding materials having different shapes or areas according to still another embodiment.

Referring to FIG. 24, a plurality of shielding members 2404 to 2406 according to the embodiment may be disposed on the lower or lower surface of the plurality of transmission coils 2401 to 2403. At this time, the plurality of shielding materials 2404 to 2406 may have a shape and an area corresponding to a shape and an area of the plurality of transmission coils 2401 to 2403.

For example, referring to FIG. 24 (a), the first shielding member 2404 may have an area and a shape corresponding to the area and shape of the first transmission coil 2401. The second shielding member 2405 may have an area and a shape corresponding to a part of the area and shape of the second transmission coil 2402. Similarly, the third shielding member 2405 may have an area and a shape corresponding to the area and shape of the third transmission coil 2403. For example, the left and right width of the second shielding member 2404 may correspond to the outer boundary of the right side of the first transmission coil 2401 and the outer boundary of the left side of the third transmission coil 2403. At this time, referring to FIG. 24B, the plurality of shielding materials 2404 to 2406 may be disposed on the same plane.

The distance between the second transmission coil 2402 and the plurality of shielding materials 2404 to 2406 and the distance between the first transmission coil 2401 and the third transmission coil 2403 and the plurality of shielding materials 2404 to 2406, 2406 may be different. The inductance value of the second transmission coil 2402 may be smaller than the inductance value of the first transmission coil 2401 and the third transmission coil 2403 due to the difference in the separation distance. In order to compensate for the difference in inductance value between the plurality of transmission coils 2401 to 2403, the wireless power transmitter may include a plurality of shielding materials 2404 to 2406 having different magnetic permeability.

The plurality of shielding materials 2404 to 2406 according to the embodiment may be disposed on the lower or lower surface of the plurality of transmission coils 2401 to 2403. For example, the plurality of shielding materials 2404 to 2406 may be disposed closely to the lower or lower surface of the plurality of transmission coils 2401 to 2403. At least one of the plurality of transmission coils 2401 to 2403 may have an inductance value different from the at least one transmission coil except for the at least one transmission coil. At least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials 2404 to 2406 may have a permeability corresponding to the inductance value.

For example, the plurality of transmit coils may include a first transmit coil 2401, a second transmit coil 2402, and a third transmit coil 2403. The first transmission coil 2401 and the third transmission coil 2403 may be disposed on the upper surface of the plurality of shielding materials 2404 to 2406 on the same plane. The second transmission coil 2402 may be disposed on a portion of the upper surface or the upper portion of the first transmission coil 2402 and a portion of the upper surface or the upper portion of the third transmission coil 2403. [

The plurality of shielding materials may include a first shielding material 2404, a second shielding material 2405, and a third shielding material 2406 disposed on the same plane. The second shielding material 2405 may be disposed between the first shielding material 2404 and the third shielding material 2406. The second transmission coil 2401 may be disposed on a part of the upper surface of the first shielding material 2404 and a part of the upper surface or the upper part of the second shielding material 2405. The third transmission coil 2403 may be disposed on a portion of the upper surface or the upper portion of the second shielding material 2405 and a portion of the upper surface or the upper portion of the third shielding material 2406. The magnetic permeability of the first shielding material 2404 and the third shielding material 2406 may be the same. The magnetic permeability of the second shielding material 2405 may exceed the magnetic permeability of the first shielding material 2404 and the third shielding material 2406.

The inductive induction coefficient (inductance) of the second transmitting coil 2402 and the plurality of shielding materials is determined by the first transmitting coil 2401 and the self induction coefficient (inductance) of the plurality of shielding materials, Can be the same. The self-induction coefficient (inductance) of the second transmission coil 2402 and the plurality of shielding materials may be the same as the self induction coefficient (inductance) of the third transmission coil 2403 and the plurality of shielding materials.

25 is a view for explaining three drive circuits including a full-bridge inverter in a wireless power transmitter including a plurality of coils according to an embodiment.

25, when three transmit coils included in a wireless power transmitter have different inductances, three drive circuits 2510 connected to each transmit coil and a capacitor for generating the same resonance frequency Three LC resonant circuits 2520 are required.

Although the wireless power transmitter includes a plurality of transmit coils, the resonant frequency that the wireless power transmitter generates to carry out the power transmission should not depend on each of the transmit coils and must conform to the standard resonant frequency supported by the wireless power transmitter.

The resonance frequency generated in the LC resonance circuit 2520 may vary depending on the inductance of the coil and the capacitance of the capacitor.

For example, the resonant frequency (fr) may be 100 KHz, and when the capacitance of the capacitor connected to the transmission coil to generate the resonance frequency is 200 nF, if only one capacitor is used, All should meet 12.5uH. When the inductances of the three transmission coils are different from each other, three capacitors having different capacitances corresponding to each other are required in order to generate a resonance frequency of 100 kHz. In addition, three drive circuits 2510 including an inverter for applying an AC voltage in each LC resonant circuit 2520 are also required.

26 is a view for explaining a wireless power transmitter including a plurality of coils and including one drive circuit according to an embodiment of the present invention.

26, if the inductance of the three transmission coils is the same, the wireless power transmitter may include only one drive circuit 2610, and may include one drive circuit 2610 and three transmit coils, The switch 2630 can be controlled to connect the transmission coil having the highest efficiency.

Compared with FIG. 25, the wireless power transmitter can reduce the area occupied by the components by using only one drive circuit 2610, thereby making it possible to miniaturize the wireless power transmitter itself and reduce the cost of raw materials required for manufacturing .

In one embodiment, the wireless power transmitter may use the signal strength indicator in the ping phase to calculate the power transfer efficiency between the three transmit coils and the receive coils.

Alternatively, the wireless power transmitter may select a transmit coil having a high coupling coefficient by calculating a coupling coefficient between the transmitting and receiving coils.

Alternatively, the wireless power transmitter may calculate a Q factor to control the switch 2630 to identify the high transmit coil of the queue factor and connect it to the drive circuit 2610.

27 is a view for explaining a drive circuit including a full-bridge inverter according to an embodiment of the present invention.

Referring to FIG. 27, a power transmitter included in a wireless power transmitter may generate a specific operating frequency for power transmission. The power transfer section may include an inverter 2710, an input power supply 2720, and an LC resonant circuit 2730.

The inverter 2710 can convert the voltage signal from the input power source and transmit it to the LC resonance circuit 2730. In one embodiment, inverter 2710 may be a full-bridge inverter or a half-bridge inverter.

The power transfer section can use a full bridge inverter for higher output than the output by the half bridge inverter. The full bridge inverter can be applied to the LC resonance circuit 2730 by outputting a voltage twice as high as that of the half bridge inverter by using four switches in the form of adding two switches to the half bridge inverter.

28 is a view for explaining a plurality of switches for connecting any one of a plurality of transmission coils to a drive circuit according to an embodiment of the present invention.

28, the power transmission unit includes a drive circuit 2810 for converting an input voltage, a switch 2820 for connecting the drive circuit 2810 and the LC resonance circuit, a plurality of transmission coils 2830, One capacitor 2840 connected in series and a control unit 2850 for controlling the opening and closing of the switch 2820.

The control unit 2850 can perform control to identify the transmission coil of the plurality of transmission coils 2830 and the transmission coil having the highest power transmission efficiency and to close the switch to connect the identified transmission coil with the drive circuit 2810 .

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.

Claims (16)

A plurality of transmission coils;
A plurality of resonant circuits corresponding to the plurality of transmission coils;
One drive circuit connected to the plurality of resonant circuits;
A plurality of switches connecting the plurality of resonant coils and the one drive circuit;
And a plurality of shielding materials disposed at a lower portion of the plurality of transmission coils and having different magnetic permeability,
Wherein at least one of the plurality of transmission coils is disposed at a different height from the at least one transmission coil except for the at least one transmission coil,
Wherein at least one shielding material disposed at a position corresponding to the at least one transmission coil among the plurality of shielding materials has a permeability different from that of at least one shielding material except the at least one shielding material. The method according to claim 1,
The plurality of transmission coils includes a first transmission coil, a second transmission coil, and a third transmission coil,
The first transmitting coil and the third transmitting coil are disposed on the same plane on the plurality of shielding materials,
The second transmission coil is disposed at a portion of the upper portion of the first transmission coil and a portion of the upper portion of the third transmission coil,
Wherein the plurality of shielding materials include a first shielding material, a second shielding material, and a third shielding material disposed on the same plane,
Wherein the second shielding material is disposed between the first shielding material and the third shielding material,
Wherein the first transmitting coil is disposed at a portion of the upper portion of the first shielding material and a portion of the upper portion of the second shielding material,
The third transmitting coil is disposed at a portion of the upper portion of the second shielding material and a portion of the upper portion of the third shielding material,
Wherein the first shielding material and the third shielding material have the same permeability,
Wherein the permeability of the second shielding material exceeds the permeability of the first shielding material and the third shielding material. 3. The method of claim 2,
Wherein the second shielding material has a width equal to the length of the width of the second transmission coil and a length of the width of the first shielding material and a width of the width of the third shielding material, transmitter. 3. The method of claim 2,
Wherein the second shielding material has a width greater than a length of the width of the second transmission coil and a length of a width of the first shielding material and a width of the width of the third shielding material, transmitter. 3. The method of claim 2,
Wherein the second shielding material is disposed such that the length of the second shielding material is less than the length of the width of the second transmission coil and exceeds the length of the width of the first shielding material and the width of the width of the third shielding material. . 3. The method of claim 2,
The second shielding material is disposed so that the width of the second shielding material corresponds to the outer periphery of the inner side of the coil of the right end section of the cross section of the first transmission coil and the outer periphery of the inner side of the coil of the left end section of the third transmission coil Wireless power transmitter. 3. The method of claim 2,
Wherein the second shielding material is disposed such that the length of the transverse width corresponds to the inner boundary of the second transmission coil. 3. The method of claim 2,
Wherein the second shielding material is disposed such that the length of the transverse width does not exceed an inner boundary of the second transmission coil. 3. The method of claim 2,
The first shielding material has an area and shape corresponding to the area and shape of the first transmission coil,
The second shielding material has an area and a shape corresponding to a part of the area and shape of the second transmission coil,
And the third shielding material has an area and shape corresponding to the area and shape of the third transmitting coil. 10. The method of claim 9,
Wherein the second shielding material is disposed so that the length of the left and right width corresponds to the inner boundary of the right side of the first transmission coil and the inner boundary of the left side of the third transmission coil. 10. The method of claim 9,
Wherein the second shielding material is disposed so that the length of the left and right width corresponds to the outer boundary of the right side of the first transmission coil and the outer boundary of the left side of the third transmission coil. 3. The method of claim 2,
Wherein the plurality of shielding materials further include a fourth shielding material disposed under the first shielding material, the second shielding material, and the third shielding material,
Wherein the permeability of the fourth shielding material is equal to the permeability of the first shielding material and the third shielding material. 3. The method of claim 2,
Wherein the plurality of shielding materials further include a fourth shielding material disposed under the first shielding material, the second shielding material, and the third shielding material,
Wherein the magnetic permeability of the fourth shielding material is different from the magnetic permeability of the first shielding material and the third shielding material. The method according to claim 1,
The plurality of transmission coils includes a first transmission coil, a second transmission coil, and a third transmission coil,
Wherein the first transmitting coil and the third transmitting coil are disposed on the same surface of the plurality of shielding materials,
The second transmission coil is disposed at a portion of the upper portion of the first transmission coil and a portion of the upper portion of the third transmission coil,
The plurality of shielding materials may include: a first shielding material disposed under the first transmission coil and the third transmission coil; And a second shielding material disposed between the first transmission coil, the second transmission coil, the third transmission coil, and the first shielding material. 15. The method of claim 14,
Wherein the first shielding material and the second shielding material have the same permeability,
Wherein the second shielding material is disposed on the first shielding material in the same plane as the first transmitting coil and the third transmitting coil,
Wherein a height of the second shielding material is equal to a height of the first transmission coil and the third transmission coil. 15. The method of claim 14,
Wherein the second shielding material is an adhesive film-like shielding material attached to a lower portion of the first transmission coil in the empty space,
The permeability of the second shielding material exceeds the permeability of the first shielding material,
Wherein a height of the second shielding material is smaller than a height of the first transmission coil and the third transmission coil.

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