WO2018074803A1

WO2018074803A1 - Wireless power transmission device

Info

Publication number: WO2018074803A1
Application number: PCT/KR2017/011427
Authority: WO
Inventors: 임성현
Original assignee: 엘지이노텍 주식회사
Priority date: 2016-10-18
Filing date: 2017-10-17
Publication date: 2018-04-26
Also published as: KR20180042578A

Abstract

A wireless power transmission device, according to the present embodiment, comprises: a substrate; a first coil formed on the substrate; and a second coil formed so as to correspond to the first coil, wherein the first coil and the second coil are different types of coils having different resistance values and are connected in parallel.

Description

Wireless power transmitter

The present embodiment relates to wireless power transmission, and more particularly, to a wireless power transmission apparatus.

Recently, with the rapid development of information and communication technology, a ubiquitous society based on information and communication technology is being made.

In order for telecommunications devices to be connected anytime and anywhere, sensors incorporating computer chips with communication functions must be installed in all social facilities. Therefore, the problem of power supply of these devices and sensors is a new problem. In addition, as the number of mobile devices such as Bluetooth handsets and music players such as iPods has increased rapidly, charging a battery has required users time and effort. In recent years, wireless power transmission technology has been attracting attention as a way to solve this problem.

Wireless power transmission or wireless energy transfer is a technology that transmits electrical energy wirelessly from a transmitter to a receiver using the principle of induction of magnetic field, which is already used by electric motors or transformers using the electromagnetic induction principle in the 1800s. Since then, there have been attempts to transmit electrical energy by radiating electromagnetic waves such as high frequency, microwaves, and lasers. Electric toothbrushes and some wireless razors that we commonly use are actually charged with the principle of electromagnetic induction.

To date, energy transmission using wireless may be classified into magnetic induction, electromagnetic resonance, and RF transmission using short wavelength radio frequency.

The magnetic induction method uses the phenomenon that magnetic flux generated at this time causes electromotive force to other coils when two coils are adjacent to each other and current flows to one coil, and is rapidly commercialized in small devices such as mobile phones. Is going on. Magnetic induction is capable of transmitting power of up to several hundred kilowatts (kW) and has high efficiency, but the maximum transmission distance is less than 1 centimeter (cm).

The magnetic resonance method is characterized by using an electric or magnetic field instead of using electromagnetic waves or current. Since the magnetic resonance method is hardly affected by the electromagnetic wave problem, it has the advantage of being safe for other electronic devices or the human body. On the other hand, it can be utilized only in limited distances and spaces, and has a disadvantage in that energy transmission efficiency is rather low.

In order to increase the efficiency of wireless charging in wireless power transmission by various methods, various coil types for power transmission in a wireless power transmission apparatus have been proposed. However, in the case of the conventional coil type, various types of coil structures implemented to reduce the resistance value have a high manufacturing cost including a material cost and a processing cost, while the charging efficiency is not high.

Therefore, in order to increase the efficiency of wireless charging, it is important to reduce the manufacturing cost of the coil and minimize the internal resistance value.

The present embodiment is to solve the problems of the prior art described above, an object of the present embodiment is to provide a wireless power transmission device for wireless charging.

Another object of the present embodiment is to provide a wireless power transmission apparatus for reducing the internal resistance of the wireless power transmission apparatus and thereby maximizing wireless charging efficiency.

Another object of the present embodiment is to provide a wireless power transmission apparatus that reduces the manufacturing cost of the wireless power transmission apparatus and increases the operation efficiency of the apparatus.

Technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

Wireless power transmission apparatus according to the present embodiment includes a substrate; A first coil formed on the substrate; And a second coil formed to correspond to the first coil, wherein the first coil and the second coil are connected in parallel with different types of coils having different resistance values.

The effects on the apparatus according to the present embodiment will be described below.

The present embodiment may have the effect of reducing the resistance value by configuring the coil as a heterogeneous coil in the wireless power transmission apparatus.

This embodiment may have an effect of reducing the manufacturing cost of the wireless power transmission apparatus by the coil configuration.

This embodiment may have the effect of increasing the charging efficiency by using a plurality of coils without a separate configuration.

Effects obtained in the present embodiment are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are provided to facilitate understanding of the present invention, and provide embodiments of the present invention together with the detailed description. However, 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 describing a detection signal transmission procedure in a wireless charging system according to one embodiment.

4 is a state transition diagram for explaining a power transmission procedure by a magnetic induction method.

5 is a state transition diagram for explaining a wireless power transmission procedure by a magnetic resonance method.

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

FIG. 7 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 6.

8 is an equivalent circuit diagram of a coil unit of the wireless power transmitter according to the present embodiment.

9 is a top view of the transmitting coil unit according to the present embodiment.

10 is an exploded perspective view of the transmitting coil unit according to the present embodiment.

11 is a top view and a side view of a transmitting coil unit according to the present embodiment.

12 is a graph showing performance varied by the transmitting coil unit configured according to the present embodiment.

13 is a perspective view of a transmission coil unit according to another exemplary embodiment.

14 is an exploded perspective view of a transmitting coil unit according to another exemplary embodiment.

15 is an exploded perspective view of a transmitting coil unit according to another exemplary embodiment.

Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in more detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other.

In the description of the embodiments, when described as being formed on the "top" or "bottom" of each component, the top (bottom) or the bottom (bottom) is the two components are in direct contact with each other or One or more other components are all included disposed between the two components. In addition, when expressed as "up (up) or down (down)" may include the meaning of the down direction as well as the up direction based on one component.

In the description of the embodiment, a device equipped with a function for transmitting wireless power on the wireless charging system is a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter for convenience of description. , A transmitter side, a wireless power transmitter, a wireless power transmitter, and the like will be used interchangeably. In addition, as a representation of a device equipped with a function for receiving wireless power from the wireless power transmitter, for convenience of description, a wireless power receiver, a wireless power receiver, a wireless power receiver, a wireless power receiver, a receiver terminal, a receiver, Receivers, receivers and the like can be used interchangeably.

The transmitter according to the present invention may be configured in a pad form, a cradle form, an access point (AP) form, a small base station form, a stand form, a ceiling buried form, a wall hanging form, and the like. You can also transfer power. To this end, the transmitter may comprise at least one wireless power transmission means. Herein, the wireless power transmission means may use various wireless power transmission standards based on an electromagnetic induction method that generates a magnetic field in the power transmitter coil and charges using the electromagnetic induction principle in which electricity is induced in the receiver coil under the influence of the magnetic field. Here, the wireless power transmission means may include a wireless charging technology of the electromagnetic induction method defined by the Wireless Power Consortium (WPC) and the Power Matters Alliance (PMA) which is a wireless charging technology standard apparatus.

In addition, the receiver according to the embodiment of the present invention may be provided with at least one wireless power receiving means, and may simultaneously receive wireless power from two or more transmitters. Here, the wireless power receiving means may include an electromagnetic induction wireless charging technology defined by the Wireless Power Consortium (WPC) and the Power Matters Alliance (PMA), which are wireless charging technology standard organizations.

The receiver according to the present invention is a mobile phone, smart phone, laptop computer, digital broadcasting terminal, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), navigation, MP3 player, electric It may be used in a small electronic device such as a toothbrush, an electronic tag, a lighting device, a remote control, a fishing bobber, a wearable device such as a smart watch, but is not limited thereto. If the device is equipped with a wireless power receiver according to the present invention, the battery can be charged. It is enough.

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

Referring to FIG. 1, a wireless charging system includes a wireless power transmitter 10 that largely transmits power wirelessly, a wireless power receiver 20 that receives the transmitted power, and an electronic device 20 that receives the received power. Can be configured.

For example, the wireless power transmitter 10 and the wireless power receiver 20 may perform in-band communication for exchanging information using the same frequency band as the operating frequency used for wireless power transmission. In another example, the wireless power transmitter 10 and the wireless power receiver 20 perform out-of-band communication for exchanging information using a separate frequency band different from an operating frequency used for wireless power transmission. It can also be done.

For example, the 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 transmitting and receiving end will be more clear 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 are not limited thereto. In another embodiment, the in-band communication and the out-of-band communication may provide one-way communication or half-duplex communication.

For example, the unidirectional communication may be performed by the wireless power receiver 20 only transmitting information to the wireless power transmitter 10, but is not limited thereto. The wireless power transmitter 10 may transmit information to the wireless power receiver 20. It may be to transmit.

In the half-duplex communication method, bidirectional communication between the wireless power receiver 20 and the wireless power transmitter 10 is possible, but at one time, only one device may transmit information.

The wireless power receiver 20 according to an embodiment of the present disclosure may obtain various state information of the electronic device 30. For example, the state 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 the like. The information may be obtained from the electronic device 30 and may be utilized for wireless power control.

In particular, the wireless power transmitter 10 according to an embodiment of the present invention may transmit a predetermined packet indicating whether to support fast charging to the wireless power receiver 20. The wireless power receiver 20 may notify the electronic device 30 when it is determined that the connected wireless power transmitter 10 supports the fast charging mode. The electronic device 30 may indicate that fast charging is possible through predetermined display means provided, for example, it may be a liquid crystal display.

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

2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.

For example, as illustrated by reference numeral 200a, the wireless power receiver 20 may be configured with a plurality of wireless power receivers, and a plurality of wireless power receivers are connected to one wireless power transmitter 10 so that the wireless Charging may also be performed. In this case, the wireless power transmitter 10 may distribute and transmit power to the plurality of wireless power receivers in a time division manner, but is not limited thereto. As another example, the wireless power transmitter 10 may distribute and transmit power to a plurality of wireless power receivers by using different frequency bands allocated for each wireless power receiver.

In this case, the number of wireless power receivers that can be connected to one wireless power transmitter 10 may include at least one of required power for each wireless power receiver, a state of charge of a battery, power consumption of an electronic device, and available power of the wireless power transmitter. Can be adaptively determined based on the

As another example, as shown at 200b, the wireless power transmitter 10 may be configured with a plurality of wireless power transmitters. In this case, the wireless power receiver 20 may be connected to a plurality of wireless power transmitters at the same time, and may simultaneously receive power from the connected wireless power transmitters and perform charging. In this case, the number of wireless power transmitters connected to the wireless power receiver 20 is adaptively based on the required power of the wireless power receiver 20, the state of charge of the battery, the power consumption of the electronic device, the available power of the wireless power transmitter, and the like. Can be determined.

3 is a view for explaining a detection signal transmission procedure in a wireless charging system according to an embodiment of the present invention.

For example, the wireless power transmitter may be equipped with three transmitting

coils

111, 112, and 113. Each transmission coil may overlap some other area with another transmission coil, and the wireless power transmitter may detect a

predetermined detection signal

117, 127 for detecting the presence of the wireless power receiver through each transmission coil, for example, Digital ping signals are sent sequentially in a predefined order.

As shown in FIG. 3, the wireless power transmitter sequentially transmits the detection signal 117 through the primary detection signal transmission procedure illustrated in FIG. 110, and receives a signal strength indicator from the wireless power receiver 115. The strength indicator 116 can identify the received

transmission coils

111, 112. Subsequently, the wireless power transmitter sequentially transmits the detection signal 127 through the secondary detection signal transmission procedure shown in FIG. 120, and transmits power among the transmission coils 111 and 112 where the signal strength indicator 126 is received. The efficiency (or charging efficiency)-that is, the alignment between the transmitting coil and the receiving coil-can identify a good transmitting coil and control that power can be sent through the identified transmitting coil-i.e. wireless charging is made. .

As shown in FIG. 3, the reason why the wireless power transmitter performs two sensing signal transmission procedures is to more accurately identify which transmitting coil is well aligned with the receiving coil of the wireless power receiver.

If the

signal strength indicators

116 and 126 are received at the first transmission coil 111 and the second transmission coil 112, as shown in the

reference numerals

110 and 120 of FIG. 3, the wireless power transmitter. Based on the signal strength indicator 126 received at each of the first transmitting coil 111 and the second transmitting coil 112 selects the best-aligned transmitting coil and performs wireless charging using the selected transmitting coil. .

Referring to FIG. 4, power transmission from a transmitter to a receiver according to a magnetic induction method is largely selected as a selection phase 410, a ping phase 420, an identification and configuration phase 430, It may be divided into a power transfer phase 440.

The selection step 410 may be a step of transitioning when a specific error or a specific event is detected while starting or maintaining the power transmission. Here, specific errors and specific events will be apparent from the following description. In addition, in the selection step 410, the transmitter may monitor whether an object exists on the interface surface. If the transmitter detects that an object is placed on the interface surface, it may transition to the ping step 420 (S401). In the selection step 410, the transmitter transmits a very short pulse of an analog ping signal, and may detect whether an object exists in an active area of the interface surface based on a change in current of a transmitting coil.

In ping step 420, when an object is detected, the transmitter activates the receiver and sends a digital ping to identify whether the receiver is a receiver that is compliant with the WPC standard. If the transmitter does not receive a response signal (for example, a signal strength indicator) from the receiver in response to the digital ping in step 420, it may transition back to the selection step 410 (S402). In addition, in the ping step 420, when the transmitter receives a signal indicating that power transmission is completed, that is, a charging completion signal, from the receiver, the transmitter may transition to the selection step 410 (S403).

When the ping step 420 is completed, the transmitter may transition to the identification and configuration step 430 for collecting receiver identification and receiver configuration and status information (S404).

In the identification and configuration step 430, the transmitter receives an unexpected packet, a desired packet has not been received for a predefined time, a packet transmission error, or a power transmission contract. If this is not set (no power transfer contract) it may transition to the selection step (410) (S405).

When the identification and configuration of the receiver is completed, the transmitter may transition to the power transmission step 240 for transmitting the wireless power (S406).

In the power transfer step 440, the transmitter receives an unexpected packet, the desired packet has not been received for a predefined time, or a violation of a preset power transfer contract occurs. transfer contract violation), if the filling is completed, the transition to the selection step (410) (S407).

In addition, in the power transmission step 440, if it is necessary to reconfigure the power transmission contract in accordance with the change in the transmitter state, the transmitter may transition to the identification and configuration step 430 (S408).

The power transmission contract may be set based on state and characteristic information of the transmitter and the receiver. For example, the transmitter state information may include information about the maximum amount of power that can be transmitted, information about the maximum number of receivers that can be accommodated, and the receiver state information may include information about required power.

Referring to FIG. 5, power transmission from a transmitter to a receiver according to a magnetic resonance method may include a standby phase (510), a digital ping phase (520), an identification phase (530), and a power transmission. It may be divided into a power transfer phase 540 and an end of charge phase 550.

The waiting step 510 may be a step of transitioning when a specific error or a specific event is detected while performing a receiver identification procedure for power transmission or maintaining power transmission. Here, specific errors and specific events will be apparent from the following description. In addition, in the waiting step 510, the transmitter may monitor whether an object exists on a charging surface. If the transmitter detects that an object is placed on the charging surface or the RXID retry is in progress, the transmitter may transition to the digital ping step 520 (S501). Here, RXID is a unique identifier assigned to a PMA compatible receiver. In the standby stage 510, the transmitter transmits a very short pulse of analog ping, and an object is placed on the active surface of the interface surface-for example, the charging bed-based on the current change of the transmitting coil. You can detect if it exists.

The transmitter transitioned to digital ping step 520 sends a digital ping signal to identify whether the detected 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 may modulate the received digital ping signal according to the PMA communication protocol to 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 by the receiver. In the digital ping step 520, if a valid response signal is received, the transmitter may transition to the identification step 530 (S502).

If, at the digital ping step 520, no response signal is received or is determined to be not a PMA compatible receiver, i.e., Foreign Object Detection (FOD), the transmitter may transition to the standby step 510. (S503). For example, the Foreign Object (FO) may be a metallic object including coins, keys, and the like.

In the identification step 530, the transmitter may transition to the waiting step 510 if the receiver identification procedure fails or the receiver identification procedure needs to be re-executed and if the receiver identification procedure has not been completed for a predefined time ( S504).

If the transmitter succeeds in identifying the receiver, the transmitter transitions to the power transmission step 540 in the identification step 530 and starts charging (S505).

In power transmission step 540, the transmitter goes to standby step 510 if the desired signal is not received within a predetermined time (Time Out), or if the FO is detected or the voltage of the transmitting coil exceeds a predefined threshold. It may transition (S506).

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

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

In addition, when the temperature measured after a predetermined time elapses below the reference value in the over temperature state, the transmitter may transition from the charging completion step 550 to the digital ping step 520 (S510).

In the digital pinging step 520 or the power transmission step 540, when the transmitter receives an end of charge (EOC) request from the receiver, the transmitter may transition to the charging completion step 550 (S508 and S511).

Referring to FIG. 6, the wireless power transmitter 600 may include a power converter 610, a power transmitter 620, a communicator 630, a controller 640, and a sensor 650. It should be noted that the configuration of the wireless power transmitter 600 is not necessarily an essential configuration, and may include more or fewer components.

As shown in FIG. 6, when power is supplied from the power supply unit 660, the power converter 610 may perform a function of converting the power into power of a predetermined intensity.

To this end, the power converter 610 may include a DC / DC converter 611 and an amplifier 612.

The DC / DC converter 611 may perform a function of converting DC power supplied from the power supply unit 660 into DC power having a specific intensity according to a control signal of the controller 640.

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

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

The power transmitter 620 may include a multiplexer 621 (or a multiplexer) and a transmission coil 622. In addition, the power transmitter 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 received through the multiplexer 621 into AC power having a specific frequency. In the above description, the AC signal generated by the carrier generator is mixed with the output terminal of the multiplexer 621 to generate AC power. However, this is only one embodiment, and the other example is before the amplifier 612. Note that it may be mixed in stages or later.

Frequency of AC power delivered to each transmission coil according to one embodiment may be different from each other, and another embodiment each using a predetermined frequency controller with a function to adjust the LC resonance characteristics differently for each transmission coil It is also possible to set different resonant frequencies for each transmission coil.

However, when the resonant frequencies generated in each of the plurality of transmission coils are different, a separate frequency controller for controlling the same may be required, thereby increasing the size of the wireless power transmitter. Thus, in one embodiment, the wireless power transmitter may include the plurality of transmission coils. Even if including the power can be transmitted using the same resonance frequency.

As shown in FIG. 6, the power transmitter 620 includes a multiplexer 621 and a plurality of transmit coils 622—that is, a first to control the output power of the amplifier 612 to be transmitted to the transmit coil. To n-th transmission coils.

When a plurality of wireless power receivers are connected, the controller 640 according to an embodiment may transmit power through time division multiplexing for each transmission coil. For example, in the wireless power transmitter 600, three wireless power receivers, i.e., the first to third wireless power receivers, are each identified through three different transmitting coils, i.e., the first to third transmitting coils. The controller 640 may control the multiplexer 621 to control power to be transmitted through a specific transmission coil in a specific time slot. In this case, the amount of power transmitted to the corresponding wireless power receiver may be controlled according to the length of the time slot allocated to each transmitting coil, but this is only one embodiment. By controlling the amplification factor of the amplifier 612 of the wireless power receiver may be controlled to transmit power.

The controller 640 may control the multiplexer 621 to sequentially transmit the sensing signals through the first to nth transmitting coils 622 during the first sensing signal transmission procedure. In this case, the controller 640 may identify a time point at which the detection signal is transmitted by using the timer 655. When the detection signal transmission time arrives, the control unit 640 controls the multiplexer 621 to detect the detection signal through the corresponding transmission coil. Can be controlled to be sent. For example, the timer 650 may transmit a specific event signal to the controller 640 at a predetermined period during the ping transmission step. When the corresponding event signal is detected, the controller 640 controls the multiplexer 621 to transmit the specific event signal. The digital ping can be sent through the coil.

In addition, the control unit 640 stores a predetermined transmission coil identifier and a corresponding transmission coil for identifying which transmission coil has received a signal strength indicator from the demodulator 632 during the first detection signal transmission procedure. Signal strength indicator received through the can be received. Subsequently, in the second detection signal transmission procedure, the control unit 640 controls the multiplexer 621 so that the detection signal may be transmitted only through the transmission coil (s) in which the signal strength indicator was received during the first detection signal transmission procedure. You may. As another example, the controller 640 transmits the second sensed signal to the transmit coil in which the signal strength indicator having the largest value is received when there are a plurality of transmit coils in which the signal intensity indicator is received during the first sensed signal transmit procedure. In the procedure, the sensing signal may be determined as the transmitting 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 is a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a PSK (Phase Shift Keying) modulation scheme, a pulse width modulation scheme, a differential 2 Differential bi-phase modulation schemes may be included, but is not limited thereto.

When a signal received through the transmitting coil is detected, the demodulator 632 may demodulate the detected signal and transmit the demodulated signal to the controller 640. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for controlling power during wireless power transmission, an end of charge (EOC) indicator, an overvoltage / overcurrent / overheat indicator, and the like. However, the present invention is not limited thereto, and may include various state information for identifying a state of the wireless power receiver.

In addition, the demodulator 632 may identify from which transmission coil the demodulated signal is received, and may provide the control unit 640 with a predetermined transmission coil identifier corresponding to the identified transmission coil.

For example, the wireless power transmitter 600 may obtain the signal strength indicator through in-band communication that communicates with the wireless power receiver using the same frequency used for wireless power transmission.

In addition, the wireless power transmitter 600 may not only transmit wireless power using the transmission coil 622 but also exchange various information with the wireless power receiver through the transmission coil 622. As another example, the wireless power transmitter 600 further includes a separate coil corresponding to each of the transmission coils 622 (that is, the first to nth transmission coils), and wireless power using the separate coils provided. Note that in-band communication with the receiver may also be performed.

In the description of FIG. 6, the wireless power transmitter 600 and the wireless power receiver perform in-band communication by way of example. However, this is only one embodiment, and is a frequency band used for wireless power signal transmission. Short-range bidirectional communication may be performed through a frequency band different from that of FIG. For example, the short-range bidirectional 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 an embodiment of the present invention may adaptively provide a fast charging mode and a general low power charging mode according to a request of the wireless power receiver.

When the fast charging mode is supported, the wireless power transmitter 600 may transmit a signal of a predetermined pattern-a business card called a first packet-for convenience of description. When the first packet is received, the wireless power receiver 600 may identify that the wireless power transmitter 600 being connected is capable of fast charging.

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

In particular, when a predetermined time elapses after the first response packet is received, the wireless power transmitter 600 may automatically switch to the fast charging mode and start fast charging.

For example, when the control unit 640 of the wireless power transmitter 600 transitions to the

power transmission step

440 or 540 of FIGS. 4 to 5, the first packet is transmitted through the transmission coil 622. However, this is only one embodiment, and in another embodiment of the present invention, the first packet may be sent in the identification and configuration step 430 of FIG. 4 or the identification step 530 of FIG. 5.

In another embodiment, it should be noted that information for identifying whether fast charging is supported may be encoded and transmitted in the digital ping signal transmitted by the wireless power transmitter 600.

If the wireless power receiver needs fast charging at any point in the power transmission step, the wireless power receiver may transmit a predetermined charging mode packet to the wireless power transmitter 600 in which the charging mode is set to fast charging. Here, the detailed configuration of the charging mode packet to be more clearly through the description of Figures 7 to 11 to be described later. Of course, when the charging mode is changed to the fast charging mode, the wireless power transmitter 600 and the wireless power receiver may control an internal operation so that power corresponding to the fast charging mode may be transmitted and received. For example, when the charging mode is changed from the normal low power charging mode to the fast charging mode, the over voltage judgment criteria, the over temperature judgment criteria, the low voltage / high voltage judgment criteria, the optimum voltage Values such as level (Optimum Voltage Level), power control offset, etc. may 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 to enable fast charging. As another example, the threshold temperature may be set to be high in consideration of the temperature rise due to the fast charging. As another example, the power control offset value, which means the minimum level at which power is controlled in the transmitter, may be set to a larger value than the general low power charging mode so that the power control offset value may quickly converge to a desired target power level in the fast charging mode.

Referring to FIG. 7, the wireless power receiver 700 includes a receiving coil 710, a rectifier 720, a DC / DC converter 730, a load 740, a sensing unit 750, and a communication unit ( 760), and may include a main controller 770. Herein, the communication unit 760 may include at least one of a demodulator 761 and a modulator 762.

Although the wireless power receiver 700 illustrated in the example of FIG. 7 is illustrated as being capable of exchanging information with the wireless power transmitter 600 through in-band communication, this is only one embodiment. The communication unit 760 according to the embodiment may provide short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.

AC power received through the receiving coil 710 may be transferred to the rectifier 720. The rectifier 720 may convert AC power into DC power and transmit the DC power to the DC / DC converter 730. The DC / DC converter 730 may convert the strength of the rectifier output DC power into a specific intensity required by the load 740 and then transfer it to the load 740. In addition, the receiving coil 710 may include a plurality of receiving coils (not shown), that is, the first to nth receiving coils. Frequency of AC power delivered to each receiving coil (not shown) according to one embodiment may be different from each other, another embodiment is a predetermined frequency controller with a function to adjust the LC resonance characteristics differently for each receiving coil It is also possible to set a different resonant frequency for each receiving coil by using a.

The sensing unit 750 may measure the intensity of the rectifier 720 output DC power and provide the same to the main controller 770. In addition, the sensing unit 750 may measure the strength of the current applied to the receiving coil 710 according to the wireless power reception, and may transmit the measurement result to the main controller 770. In addition, the sensing unit 750 may measure the internal temperature of the wireless power receiver 700 and provide the measured temperature value to the main controller 770.

As an example, the main controller 770 may determine whether the overvoltage is generated by comparing the measured intensity of the rectifier output DC power with a predetermined reference value. As a result of the determination, when the overvoltage is generated, a predetermined packet indicating that the overvoltage has occurred may be generated and transmitted to the modulator 762. Here, the signal modulated by the modulator 762 may be transmitted to the wireless power transmitter 600 through the receiving coil 710 or a separate coil (not shown). In addition, when the intensity of the rectifier output DC power is greater than or equal to a predetermined reference value, the main controller 770 may determine that a sensing signal has been received. When the sensing signal is received, a signal strength indicator corresponding to the sensing signal may be modulated. ) To be transmitted to the wireless power transmitter 600. As another example, the demodulator 761 demodulates an AC power signal or a rectifier 720 output DC power signal between the receiving coil 710 and the rectifier 720 to identify whether a detection signal is received, and then, the main subject of the identification result. It may be provided to the unit 770. In this case, the main controller 770 may control the signal strength indicator corresponding to the sensing signal to be transmitted through the modulator 762.

8 is an equivalent circuit diagram of a coil unit of the wireless power transmitter according to the present embodiment, FIG. 9 is a top view of the transmitting coil unit according to the present embodiment, FIG. 10 is an exploded perspective view of the transmitting coil unit according to the present embodiment, 11 is a top view and a side view of a transmitting coil unit according to the present embodiment.

8 to 11, the transmission coil unit according to the present embodiment includes a plurality of transmission coils 810 and 820 of different types. For example, the transmitting coil unit includes a first coil 810 formed of a pattern coil formed on a flexible printed circuit board (FPCB) and a second coil 820 formed to be wound in correspondence with the first coil. In this case, the second coil may include a crimped coil that compresses and attaches the material wound in the form of a copper winding coil or a coil. That is, the first coil and the second coil each include a coil having a heterogeneous material or form.

As shown in FIG. 8, the first coil 810 and the second coil 820 are connected in parallel to each other. In this case, the first coil 810 and the second coil 820 have different resistance values. In detail, the second coil 820 has a low resistance value compared to the first coil 810. Since the first coil 810 is formed on the flexible circuit board, and the second coil 820 has a form of a wound copper coil, the first coil 810 and the second coil 820 constitute a material of the coil. And the second coil 820 has a lower resistance value than the first coil 810 by the characteristics.

Inductances of the first coil 810 and the second coil 820 may be the same. Alternatively, inductances of the first coil 810 and the second coil 820 may be different. In this case, the inductance of the second coil 820 may be lower than the inductance of the first coil 810.

9 and 10, the first coil 810 is disposed in an outer region of the substrate 800, and the second coil 820 is formed of the substrate 800 on which the first coil 810 is not disposed. It may be disposed in the inner region. In this case, the first coil 810 and the second coil 820 may be formed on the same layer of the substrate 800.

Also, in the present exemplary embodiment, a structure in which the first coil 810 and the second coil 820 are disposed on the same layer as the upper surface of the substrate 800 is described, but is not limited thereto. The first coil 810 and the second coil 820 may be formed.

The first coil 810 is a pattern coil and may be configured in the form of a circle or a polygon having a predetermined angle. The first coil 810 is formed on the substrate 800 by a laminating process and an etching process. The first coil 810 may include a first terminal 811 formed at one end and a second terminal 812 formed at the other end of the first coil 810.

The second coil 820 may be disposed on the substrate 800. The second coil 820 is composed of a winding coil. The second coil 820 may be configured in a circular or polygonal shape having a predetermined angle. The second coil 820 may include a first terminal 821 formed at one end and a second terminal 822 formed at the other end of the second coil 820. At this time, the first terminal 811 of the first coil 810 and the first terminal 821 of the second coil 820 are connected, and the second terminal 821 of the first coil 810 and the second coil ( The second terminal 822 of 820 is connected.

In detail, the first coil 810 and the second coil 820 may have a parallel connection structure in which the

first terminals

811 and 821 and the

second terminals

812 and 822 are connected. At this time, the first terminal 811 of the first coil 810 and the first terminal 821 of the second coil 820 and the second terminal 812 and the second coil 820 of the first coil 820. The second terminal 822 may be directly connected. Or by connecting

portions

833 and 834.

The connecting parts 830: 831, 832, 833, and 834 may be conductive patterns. The conductive pattern may be formed on the substrate 800 by a laminating process and an etching process.

The contact part 840 is in electrical contact with the terminal device, and the first coil 810 and the second coil 820 are connected in parallel, and are connected to the connection part 830 connected in parallel.

The contact 840 includes a first contact 841 and a second contact 842. The first contact part 841 is connected to a first connection part 831 connected to a first terminal 811 of the first coil 810 and a second terminal 821 of the second coil 820. The second contact portion 842 is connected to a second connection portion 832 to which the second terminal 812 of the first coil 810 and the second terminal 822 of the second coil 820 are connected.

In detail, the first connection part 831, which is drawn out from the first terminal 811 of the first coil 810, is connected to the first contact part 841, and is drawn out from the second terminal 812 of the first coil 810. The second connection portion 832 is connected to the second contact portion 842.

As illustrated in FIG. 11, a first coil 810 may be formed on the substrate 800, and a second coil 820 may be disposed inside the substrate 800.

In an embodiment, the first coil 810 is disposed in an outer region of the substrate 800, and the second coil 820 is disposed in an inner region of the substrate 800 such that the first coil 810 and the second coil ( The structure in which 820 is connected in parallel without overlapping has been described. However, the present invention is not limited thereto and may have a structure in which the first coil 810 and the second coil 820 may be disposed to be stacked in the vertical direction. In addition to the various embodiments will be described later.

As described above, since the first coil 810 and the second coil 820 have different resistance values and are connected in parallel with each other, the first coil 810 and the second coil 820 may have an effect of reducing the resistance value compared to the case where the coils having the same resistance value are configured. have. Hereinafter, with reference to FIG. 12, the amount of change in inductance and the amount of change in resistance according to the configuration of the coil to be applied to the present embodiment will be described.

Referring to FIG. 12, (a) an exemplary view is a graph showing a change in inductance value 1211 for each frequency according to a conventional coil configuration and a change in inductance value 1212 for each frequency according to a coil configuration applied in the present embodiment. (b) An exemplary diagram is a graph showing a change in resistance value 1221 for each frequency according to a conventional coil configuration and a resistance value 1222 for each frequency according to a coil configuration applied in the present embodiment.

Referring to the graph (a), the inductance value 1211 when the same coil having the same resistance value is conventionally disposed on both sides of the substrate and the coil having the different resistance value according to the present embodiment are the same surface or stacked on the substrate. The difference and change in inductance value 1212 when connected in parallel are kept constant for each frequency, and the difference does not appear large. On the other hand, referring to the graph (b), the resistance value 1222 according to the coil configuration according to the present embodiment is compared with the resistance value 1221 according to the conventional coil configuration while maintaining the inductance value as shown in the graph (a). ) Decreases. That is, when one coil has a lower resistance value than the other coil compared with the conventional configuration of the coil having the same resistance value, the synthetic resistance value is reduced by the coil having the low resistance value.

Therefore, in the case where a plurality of coils having different resistance values are arranged, the inductance may be kept constant compared to the conventional method of forming the same coil on both sides, and thus the resistance value may be reduced.

In an embodiment, the structure in which the first coil 810 and the second coil 820 are directly contacted or connected by one connection part has been described. Hereinafter, another connection structure of the first coil 810 and the second coil 820 will be described with reference to FIGS. 13 and 14.

13 is a perspective view of a transmission coil unit according to another embodiment, and FIG. 14 is an exploded perspective view of a transmission coil unit according to another embodiment.

13 and 14, the first coil 810 is disposed in the outer region of the substrate 800, and the second coil 820 is inside the substrate 800 in which the first coil 810 is not disposed. May be placed in the area. In this case, the first coil 810 and the second coil 820 may be formed on the same layer of the substrate 800. In addition, in the present exemplary embodiment, a structure in which the first coil 810 and the second coil 820 are disposed on the same layer as the upper surface of the substrate 800 has been described, but is not limited thereto. The coil 810 and the second coil 9820 may be formed in a structure in which the coil 810 and the second coil 9820 are disposed.

The first coil 810 is a pattern coil and may be configured in a circular or polygonal shape having a predetermined angle. The first coil 810 is formed on the substrate 800 by a laminating process and an etching process. The first coil 810 may include a first terminal 811 formed at one end and a second terminal 812 formed at the other end of the second coil 810.

The second coil 820 may be disposed on the substrate 800. The second coil 820 is composed of a winding coil. The second coil 820 may be configured in a circular or polygonal shape having a predetermined angle. The second coil 820 may include a first terminal 8721 formed at one end and a second terminal 822 formed at the other end of the second coil 820.

The first terminal 811, the second terminal 812 of the first coil 810, and the first terminal 821 and the second terminal 822 of the second coil 820 are connected to the connecting portions 830: 831, 832, 833, and 834, respectively. By contact 840: 841,842,843,844.

The contact part 840 is a first contact part 841 connected to the first connection part 831 of the first coil 810, and a second contact part 842 connected to the second connection part 832 of the first coil 810. The third contact part 843 is connected to the first connection part 833 of the second coil 820, and the fourth contact part 834 is connected to the second connection part 834 of the second coil 820.

In this case, in order to connect the first terminal 811 of the first coil 810 and the first terminal 821 of the second coil 820 in parallel, the first contact part 841 and the third contact part 843 are connected to each other. The connection lead 851 is connected. Also, in order for the first coil 810 to connect the second terminal 812 and the second terminal 822 of the second coil 820 in parallel, the second contact part 842 and the fourth contact part 844 have a second contact point. The connection lead 852 is connected. Therefore, the contact portion 840 is connected, so that the first coil 810 and the second coil 820 may be connected in parallel.

The first coil 810 and the second coil 820 are disposed on the same layer as the upper or lower surface of the substrate 800, and the second coil 820 is inside the substrate 800. It can be formed by being bonded to the adhesive member on,

In one embodiment and another embodiment, a structure in which the first coil 810 and the second coil 820 are disposed on the same plane of the substrate so as not to overlap the outer region and the inner region has been described. Hereinafter, a structure in which the first coil 810 and the second coil 820 are stacked in the vertical direction and connected in parallel will be described in detail with reference to FIG. 15.

Referring to FIG. 15, the first coil 810 is disposed on the substrate 800. In this case, the first coil 810 is a pattern coil, and may be configured in the form of a circle or a polygon having a predetermined angle. The first coil 810 is formed on the substrate 800 by a laminating process and an etching process. The first coil 810 may include a first terminal 811 formed at one end and a second terminal 812 formed at the other end of the first coil 810.

The second coil 890 is formed to have a corresponding size of the first coil 810. Specifically, the second coil 890 is stacked in the vertical direction of the first coil 810 and connected in parallel. Preferably, the second coil 890 may be disposed on the upper surface of the second coil 890 in a size corresponding to that of the first coil 810 so as to be connected in parallel.

The second coil 890 may be configured in a circular or polygonal shape having a predetermined angle to correspond to the first coil 810. The second coil 890 may include a first terminal 891 formed at one end and a second terminal 892 formed at the other end of the second coil 890. At this time, the first terminal 811 of the first coil 810 and the first terminal 891 of the second coil 890 are connected, and the second terminal 812 of the first coil 810 and the second coil ( The second terminal 821 of 890 is connected.

In detail, the first coil 810 and the second coil 890 may have a parallel connection structure in which the first terminals 811 and 891 and the second terminals 812 and 892 are connected. At this time, the first terminal 811 of the first coil 810 and the first terminal 891 of the second coil 890 and the second terminal 812 and the second coil 890 of the first coil 820. The second terminal 892 of may be directly connected. Or by a connection.

As described above, in another exemplary embodiment, the structure in which the first coil 810 and the second coil 890 are stacked in the vertical direction at a corresponding size and position is disposed on the substrate 800. However, the present invention is not limited thereto, and when the first coil 810 is disposed on the lower surface of the substrate 800, the second coil 890 may be disposed below the vertical direction of the first coil 810.

Therefore, in the present embodiment, by configuring a plurality of coils having different resistance values in parallel, the manufacturing process may be simplified and the cost may be reduced.

In addition, according to the present embodiment, it is possible to reduce the resistance value and increase the efficiency of power transmission.

The foregoing detailed description should not be construed as limiting in all respects, but should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims

Board;

A first coil formed on the substrate;

A second coil formed corresponding to the first coil,

The first coil and the second coil is a wireless power transmission apparatus in which heterogeneous coils having different resistance values are connected in parallel.
The method of claim 1,

The first coil is a pattern coil,

The second coil is a wireless power transmitter including a winding coil.
In accordance with claim 1

The first coil is a pattern coil,

The second coil is a wireless power transmission apparatus including a compression coil formed by pressing a winding coil.
The method of claim 1,

And the first coil and the second coil are disposed on the same layer.
The method of claim 1,

The first coil and the second coil is a wireless power transmitter having the same inductance value.
The method of claim 1,

The first coil is disposed in the outer region of the substrate,

And the second coil is disposed in an inner region of the substrate.
The method of claim 6,

The first coil includes a first terminal at one end and a second terminal at the other end,

The second coil includes a first terminal at one end and a second terminal at the other end,

And a first terminal of the first coil is connected to a first terminal of the second coil, and a second terminal of the first coil is connected to a second terminal of the second coil.
The method of claim 1,

The second coil is a wireless power transmission device disposed in a vertical stack of the first coil.
The method of claim 7, wherein

Wireless power transmitter is the same size as the size of the first coil and the second coil.
The method of claim 7, wherein

The second coil is formed smaller than the first coil wireless power transmitter.