WO2018021687A1

WO2018021687A1 - Wireless power transmitter and wireless power receiver

Info

Publication number: WO2018021687A1
Application number: PCT/KR2017/006347
Authority: WO
Inventors: 임성현
Original assignee: 엘지이노텍(주)
Priority date: 2016-07-28
Filing date: 2017-06-16
Publication date: 2018-02-01
Also published as: KR20180013088A

Abstract

The present invention relates to a wireless power transmission technology and, more specifically, to a method for removing noise of a coil for transmitting and receiving wireless power. A wireless power transmitter according to one embodiment of the present invention comprises: a transmission coil for wirelessly transmitting power; a connector for electrically connecting a circuit board, which controls the transmission coil, with the coil; and a noise removal circuit inserted into a lead line of the transmission coil between the transmission coil and the connector and removing high-frequency noise.

Description

Wireless power transmitter and wireless power receiver

The present invention relates to a wireless power transmission technology, and more particularly, to a method of removing noise of a coil for transmitting and receiving wireless power.

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 radio waves 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.

The short wavelength wireless power transmission scheme—simply, the RF transmission scheme— takes advantage of the fact that energy can be transmitted and received directly in the form of RadioWave. This technology is a wireless power transmission method of the RF method using a rectenna, a compound word of an antenna and a rectifier (rectifier) refers to a device that converts RF power directly into direct current power. In other words, the RF method is a technology that converts AC radio waves to DC and uses them. Recently, research on commercialization has been actively conducted as efficiency is improved.

Wireless power transfer technology can be used in various industries, such as the mobile, IT, railroad and consumer electronics industries.

Recently, a wireless power transmitter equipped with a plurality of coils has been introduced to increase the recognition rate of the wireless power receiver placed in the charging bed. Each of the plurality of coils may transmit a wireless power signal and various signals, or may receive various signals from a wireless power receiver. In this case, high-frequency noise as well as the wireless power signal and various control signals may also be introduced into the plurality of coils. The high-frequency noise may cause a decrease in wireless power reception efficiency and an error in recognition of the control signal. It can have a big impact.

The present invention has been devised to solve the above-mentioned problems of the prior art, and an object of the present invention is to effectively remove high-frequency noise present in a coil for transmitting and receiving a wireless power signal or various control signals, and a wireless power transmitter and a wireless power receiver. To provide.

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 transmitter according to an embodiment of the present invention includes a transmission coil for transmitting power wirelessly; A connector to electrically connect the circuit board controlling the transmitting coil and the transmitting coil; And a noise removing circuit inserted between a lead coil of the transmitting coil and the high frequency noise between the transmitting coil and the connector.

In some embodiments, the noise canceling circuit is a bead connected in series with a lead of the transmitting coil.

In some embodiments, the bead includes an inductor and a resistor connected in parallel to each other, and when the signal applied to the transmitting coil is a high frequency, the resistor may absorb the signal to remove high frequency noise.

According to an embodiment, the connector comprises: a substrate; And at least one pin inserted on the substrate, wherein the at least one pin includes: an upper connection part connected to a lead wire of the transmission coil; And a lower connection part connected to the circuit board such that the circuit board and the transmitting coil are electrically connected to each other.

A wireless power transmitter according to another embodiment of the present invention, a transmission coil for transmitting power wirelessly; And a connector for electrically connecting the circuit board controlling the transmitting coil and the transmitting coil, wherein the connector is connected to a pin to which the first lead of the transmitting coil is connected and the second lead of the transmitting coil is connected. It may include a noise cancellation circuit connected between the pins to remove high frequency noise.

A wireless power receiver according to an embodiment of the present invention, the receiving coil for receiving power wirelessly; A connector for electrically connecting the circuit board controlling the receiving coil and the receiving coil; And a noise removing circuit inserted between the receiving coil and the connector and inserted into a lead wire of the receiving coil to remove high frequency noise.

In accordance with another aspect of the present invention, a wireless power receiver includes: a receiving coil for wirelessly receiving power; And a connector for electrically connecting the circuit board for controlling the receiving coil and the receiving coil, wherein the connector includes a pin connected to a first lead of the receiving coil and a second lead of the receiving coil. It may include a noise cancellation circuit connected between the pins to remove high frequency noise.

The above aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected will be described in detail below by those skilled in the art. Can be derived and understood.

The effects on the apparatus according to the present invention are described as follows.

According to the wireless power transmitter and the wireless power receiver according to an embodiment of the present invention, by implementing a circuit capable of removing high frequency noise on the transmitting coil side, it is possible to more effectively remove the high frequency noise.

The effects obtainable in the present invention 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. 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 new embodiments.

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

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

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

4 is a block diagram illustrating a structure of an induction transmitter according to an embodiment of the present invention.

FIG. 5 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter according to FIG. 4.

6 is a diagram for describing a transmitting coil module according to an exemplary embodiment of the present invention.

FIG. 7 illustrates an embodiment of the bead shown in FIG. 6 in more detail.

8 is a view schematically showing a connector according to another embodiment of the present invention.

FIG. 9 is a diagram illustrating an embodiment of an embedded circuit illustrated in FIG. 8.

A wireless power transmitter according to a first embodiment of the present invention includes a transmission coil for transmitting power wirelessly; A connector to electrically connect the circuit board controlling the transmitting coil and the transmitting coil; And a noise removing circuit inserted between a lead coil of the transmitting coil and the high frequency noise between the transmitting coil and the connector.

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, where it is 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, the apparatus for transmitting wireless power on the wireless power system is a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, a transmitter, a transmitter, A wireless power transmitter, a wireless power transmitter, and the like will be used interchangeably. In addition, as a representation of a device for receiving wireless power from a 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, a receiver, a receiver Or the like can be used in combination.

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 an 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.

Referring to FIG. 1, 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. 1, the wireless power transmitter sequentially transmits a sensing signal 117 through a primary sensing signal transmitting procedure shown 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. 1, 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 in the first transmitting coil 111 and the second transmitting coil 112, as shown in

reference numerals

110 and 120 of FIG. 1, 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. 2, power transmission from a transmitter to a receiver according to the WPC standard can be divided into a selection phase 210, a ping phase 220, an identification and configuration phase 230, It may be divided into a power transfer phase 240.

The selection step 210 may be a step of transitioning when a specific error or a specific event is detected while starting or maintaining power transmission. Here, specific errors and specific events will be apparent from the following description. In addition, in the selection step 210, 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, the transmitter may transition to the ping step 220 (S201). In the selection step 210, the transmitter transmits an analog ping signal of a very short pulse, and detects 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 220, 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 to the digital ping (eg, signal strength indicator) from the receiver in the ping step 220, it may transition back to the selection step 210 (S202). In addition, in the ping step 220, when the transmitter receives a signal indicating that the power transmission is completed, that is, the charging completion signal, the transmitter may transition to the selection step 210 (S203).

When the ping step 220 is completed, the transmitter may transition to the identification and configuration step 230 for collecting receiver identification and receiver configuration and status information (S204).

In the identification and configuration step 230, 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 210 (S205).

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 (S206).

In the power transmission step 240, the transmitter receives an unexpected packet, an outgoing desired packet for a predefined time, or a violation of a preset power transmission contract. transfer contract violation), if the filling is completed, the transition to the selection step (210) (S207).

In addition, in the power transmission step 240, 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 230 (S208).

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. 3, power transmission from a transmitter to a receiver according to the PMA standard is divided into a standby phase (310), a digital ping phase (320), an identification phase (330), and a power transmission. The operation may be divided into a power transfer phase 340 and an end of charge phase 350.

The waiting step 310 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 310, 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 320 (S301). Here, RXID is a unique identifier assigned to a PMA compatible receiver. In the standby phase 310, 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 the digital ping step 320 sends a digital ping signal to identify whether the detected object is a PMA compatible receiver. When sufficient power is supplied to the receiving end 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 320, if a valid response signal is received, the receiver may transition to the identification step 330 (S302).

If, at the digital ping step 320, no response signal is received or it is determined that the PMA compatible receiver is not—that is, Foreign Object Detection (FOD) —the transmitter may transition to the standby step 310. (S303). For example, the Foreign Object (FO) may be a metallic object including coins, keys, and the like.

In the identification step 330, the transmitter may transition to the waiting step 310 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 ( S304).

If the transmitter succeeds in identifying the receiver, the transmitter transitions from the identification step 330 to the power transmission step 340 to start charging (S305).

In power transmission step 340, the transmitter goes to standby step 310 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 reference value. It may transition (S306).

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

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

In addition, when the temperature measured after the lapse of a predetermined time has fallen below the reference value in the over temperature state, the transmitter may transition from the charging completion step 350 to the digital ping step 320 (S310).

In the digital ping step 320 or the power transfer step 340, when the transmitter receives an end of charge (EOC) request from the receiver, the transmitter may transition to the charging completion step 350 (S308 and S311).

Referring to FIG. 4, the wireless power transmitter 400 may be largely configured to include a power converter 410, a power transmitter 420, a communicator 430, a controller 440, and a sensor 450. have. It should be noted that the configuration of the wireless power transmitter 400 is not necessarily required, and may include more or fewer components.

As shown in FIG. 4, when power is supplied from the power supply unit 460, the power converter 410 may perform a function of converting the power into power of a predetermined intensity.

To this end, the power converter 410 may include a DC / DC converter 411 and an amplifier 412.

The DC / DC converter 411 may perform a function of converting DC power supplied from the power supply unit 450 into DC power having a specific intensity according to a control signal of the controller 440.

In this case, the sensing unit 450 may measure the voltage / current of the DC-converted power and provide the same to the controller 440. In addition, the sensing unit 450 may measure the internal temperature of the wireless power transmitter 400 to determine whether overheating occurs, and provide the measurement result to the controller 440. For example, the controller 440 may adaptively block power supply from the power supply unit 450 or block power from being supplied to the amplifier 412 based on the voltage / current value measured by the sensing unit 450. Can be. To this end, one side of the power converter 410 may be further provided with a predetermined power cut-off circuit for cutting off the power supplied from the power source 450, or cut off the power supplied to the amplifier 412.

The amplifier 412 may adjust the intensity of the DC / DC converted power according to the control signal of the controller 440. For example, the controller 440 may receive power reception state information and / or power control signal of the wireless power receiver through the communication unit 430, and may be based on the received power reception state information or (and) power control signal. The amplification factor of the amplifier 412 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 420 may include a multiplexer 421 (or multiplexer) and a transmission coil 422. In addition, the power transmitter 420 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 412 received through the multiplexer 421 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 421 to generate AC power. However, this is only one embodiment, and the other example is before the amplifier 412. Note that it may be mixed in stages or later.

It should be noted that the frequencies of AC power delivered to each transmitting coil in accordance with one embodiment of the present invention may be different from each other. According to another embodiment of the present invention, the resonance frequency of each transmission coil may be set differently by using a predetermined frequency controller having a function of differently adjusting the LC resonance characteristics for each transmission coil.

The power transmitter 420 includes a multiplexer 421 and a plurality of transmit coils 422—that is, first to nth transmit coils—for controlling the output power of the amplifier 412 to be transmitted to the transmit coil. Can be configured.

When a plurality of wireless power receivers are connected, the controller 440 according to an embodiment of the present invention may transmit power through time division multiplexing for each transmission coil. For example, in the wireless power transmitter 400, 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 440 may control the multiplexer 421 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 412 of the wireless power receiver can also control the transmission power.

The controller 440 may control the multiplexer 421 to sequentially transmit the sensing signals through the first to nth transmitting coils 422 during the first sensing signal transmission procedure. In this case, the controller 440 may identify a time point at which the detection signal is transmitted by using the timer 455. When the detection signal transmission time arrives, the control unit 440 controls the multiplexer 421 to detect the detection signal through the corresponding transmission coil. Can be controlled to be sent. For example, the timer 450 may transmit a specific event signal to the controller 440 at a predetermined period during the ping transmission step. When the corresponding event signal is detected, the controller 440 controls the multiplexer 421 to transmit the specific event signal. The digital ping can be sent through the coil.

In addition, the control unit 440 may identify a predetermined transmission coil identifier and a corresponding transmission coil for identifying which transmission coil has received a signal strength indicator from the demodulator 432 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 440 controls the multiplexer 421 so that the detection signal is transmitted only through the transmission coil (s) in which the signal strength indicator is received during the first detection signal transmission procedure. You may. As another example, when there are a plurality of transmitting coils receiving the signal strength indicator during the first sensing signal transmitting procedure, the controller 440 sends the second sensing signal to the transmitting coil in which the signal strength indicator having the largest value is received. In the procedure, the detection signal may be determined as the transmission coil to be transmitted first, and the multiplexer 421 may be controlled according to the determination result.

The modulator 431 may modulate the control signal generated by the controller 440 and transmit the modulated control signal to the multiplexer 421. 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 432 may demodulate the detected signal and transmit the demodulated signal to the controller 440. 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 432 may identify from which transmission coil the demodulated signal is received, and may provide the control unit 440 with a predetermined transmission coil identifier corresponding to the identified transmission coil.

In addition, the demodulator 432 may demodulate a signal received through the transmission coil 422 and transmit the demodulated signal to the controller 440. For example, the demodulated signal may include a signal strength indicator, but is not limited thereto. The demodulated signal may include various state information of the wireless power receiver.

For example, the wireless power transmitter 400 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 400 may transmit wireless power using the transmission coil 422 and may exchange various information with the wireless power receiver through the transmission coil 422. As another example, the wireless power transmitter 400 further includes a separate coil corresponding to each of the transmission coils 422 (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. 4, the wireless power transmitter 400 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.

Referring to FIG. 5, the wireless power receiver 500 includes a receiving coil 510, a rectifier 520, a DC / DC converter 530, a load 540, a sensing unit 550, and a communication unit ( 560, the controller 570 may be configured to be included. Here, the communication unit 560 may include a demodulator 561 and a modulator 562.

Although the wireless power receiver 500 illustrated in the example of FIG. 5 is illustrated as being capable of exchanging information with the wireless power transmitter 500 through in-band communication, this is only one embodiment. The communication unit 560 according to another 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 510 may be transferred to the rectifier 520. The rectifier 520 may convert AC power into DC power and transmit the DC power to the DC / DC converter 530. The DC / DC converter 530 may convert the strength of the rectifier output DC power into a specific strength required by the load 540 and then transfer the power to the load 540.

The sensing unit 550 may measure the intensity of the rectifier 520 output DC power and provide the same to the controller 570. In addition, the sensing unit 550 may measure the strength of the current applied to the receiving coil 510 according to the wireless power reception, and transmit the measurement result to the control unit 570. In addition, the sensing unit 550 may measure the internal temperature of the wireless power receiver 500 and provide the measured temperature value to the controller 570.

As an example, the controller 570 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 562. Here, the signal modulated by the modulator 562 may be transmitted to the wireless power transmitter 400 through the receiving coil 510 or a separate coil (not shown). In addition, the control unit 570 may determine that a detection signal is received when the intensity of the rectifier output DC power is greater than or equal to a predetermined reference value. When the detection signal is received, a signal strength indicator corresponding to the detection signal is modulated by the modulator 562. In another example, the demodulator 561 may control an AC power signal or a rectifier 520 output DC between the receiving coil 510 and the rectifier 520. After demodulating the power signal to identify whether the detection signal is received, the identification result may be provided to the controller 570. In this case, the controller 570 may control the signal strength indicator corresponding to the detection signal to be transmitted through the modulator 561.

According to another embodiment of the present invention, the controller 570 may change the charging mode based on at least one of a battery charge rate, an internal temperature, a strength of the rectifier output voltage, a CPU usage rate installed in the electronic device, and a user menu selection. It may be determined whether it is necessary, and as a result of the determination, if it is necessary to change the charging mode, a charging mode packet including the changed charging mode value may be generated and transmitted to the wireless power transmitter.

Referring to FIG. 6, the transmitting coil module 600 is equipped with a plurality of coils 422 illustrated in FIG. 4, such that the power converter 410, the communication unit 430, the control unit 440, and the sensing unit 450 are installed. It refers to a device that is modularized to be connected to a control circuit board including components for controlling the operation of the wireless power transmitter 400, such as). It is assumed that the plurality of coils mounted on the transmitting coil module 600 is composed of three transmitting

coils

111, 112, and 113 shown in FIG. 1.

Coils mounted on the transmitting coil module 600 may have various specifications (eg, certified coils according to the WPC standard, certified coils according to the PMA standard), and the shape, size, temperature characteristics, and power transmission of coils having various specifications. Efficiency, connection characteristics, etc. may differ from specification to specification. Therefore, the transmission coil module 600 may be customized to be suitable for the coils that are targeted among coils having various specifications.

In the present specification, a method in which the transmitting coil module 600 is manufactured so that three coils may be mounted to overlap each other will be described. However, the scope of the present invention is not limited thereto, and any number (for example, one or two) is described. , Four, etc.) may be disposed at any position.

The transmitting coil module 600 includes a first coil 610, a coil frame 620, a second coil 630, a third coil 640, a shield 650, a metal sheet 660, and a connector. 670 may include.

The first coil 610 may correspond to any one of the three transmitting

coils

111, 112, and 113 (eg, the transmitting coil 112) illustrated in FIG. 1. The first coil 610 may be implemented in the form of a spiral wound wire, the cross section of the wire may include a conductive material (for example, copper (Cu)) and an insulating material surrounding the conductive material.

The first coil 610 may be inserted into a space corresponding to the first coil 610 in the coil frame 620. When the first coil 610 is inserted into the coil frame 620, a method by a separate adhesive sheet (for example, a double-sided tape), a coating method (bonding method) of a synthetic resin having an adhesive force and an insulating property, and the like Although used, the scope of the present invention is not limited thereto.

The coil frame 620 may provide a frame for mounting the remaining components of the transmitting coil module 600, including the first coil 610, the second coil 630, and the third coil 640. The coil frame 620 may be implemented with reinforced plastics, but the scope of the present invention is not limited thereto. When the coil frame 620 is made of reinforced plastic, the overall weight of the transmitting coil module 600 may be reduced while protecting the

coils

610, 630, and 640 from external impact and damage.

The coil frame 620 may include receiving parts, a fixing hole 621, a function hole 622, and a lead wire insertion terminal 623.

The coil frame 620 may include a first accommodating part into which one transmitting coil 610 may be inserted into an upper part, and a second accommodating part into which two transmitting

coils

630 and 640 may be inserted into a lower part and a third accommodating part. A receptacle can be provided. At least a portion of each of the first accommodating portion, the second accommodating portion, and the third accommodating portion may overlap each other. The scope of the present invention is not limited thereto, and may be implemented such that two transmitting coils may be inserted at the top and one transmitting coil may be inserted at the bottom.

The first accommodating part may include an area overlapping with each of the second accommodating part and the third accommodating part, and the overlapping area may be implemented to be 50% or more of the entire area of the first accommodating part.

The fixing holes 621 are each corner of the coil frame 620 so that the fixing means (for example, bolts or nuts) can be inserted into the other components of the wireless power transmitter (for example, the control circuit board). It is prepared every time. That is, the transmitting coil module 600 may be bound with other components through the fixing hole 621.

In addition, the coil frame 620 additionally provides an extra space for connecting the lead wires of each coil to the lead wire insertion terminal 623 while the

coils

610, 630, and 640 are inserted into the coil frame 620. can do.

The function hole 622 may be provided to obtain additional information related to the

coils

610, 630, and 640. For example, a thermistor for outputting an electrical signal corresponding to the temperature of each

coil

610, 630, and 640 may be included in the lower control circuit board. Each thermistor may be configured through each of the coils through the function hole 622. The

temperatures

610, 630, and 640 may be sensed.

According to another embodiment, each thermistor may be implemented in the function hole 622.

The lead wire insertion terminal 623 may be provided so that a total of six lead wires of the

coils

610, 630, and 640 may be fitted thereto. Lead wires may be formed at the inner end of each of the

coils

610, 630, and 640 implemented in a helical shape (which extends from the inner end to a position adjacent to the outer end as shown in FIG. 6) and the outer end, respectively. The lead wires correspond to both ends of the

coils

610, 630, and 640, and may be connected to the control circuit board through the connector 670.

Each of the second coil 630 and the third coil 640 may correspond to any one of the three transmitting

coils

111, 112, and 113 (eg, the transmitting coil 111 or 113) illustrated in FIG. 1. . Each of the second coil 630 and the third coil 640 may be implemented in the form of a spiral wound with wires, and a cross section of the wire may include a conductive material (eg, copper) and an insulating material surrounding the conductive material. It may include.

In the relationship with the first coil 610, the second coil 630 and the third coil 640 are completely separated from each other so that a dead spot, which is an area where charging is impossible, does not occur. It may be disposed overlapped and spaced apart from each other on the same plane.

When each of the second coil 630 and the third coil 640 is inserted into the coil frame 620, a method by a separate adhesive sheet (for example, a double-sided tape), a coating method of a synthetic resin having adhesive strength and insulation ( Bonding method) and the like, but the scope of the present invention is not limited thereto.

The shielding material 650 may shield the magnetic field generated from the

coils

610, 630, and 640 to block the magnetic field from being transmitted to the lower control circuit board. The shielding material 650 may be implemented as a ferrite sheet, but the scope of the present invention is not limited thereto.

The shielding material 650 may be attached to a space corresponding to the shielding material 650 of the lower portion of the coil frame 620 in the coil frame 520b in which the second coil 630 and the third coil 640 are mounted. The shield 650 may be embodied in an area and a shape corresponding to an area of a plane where the

coils

610, 630, and 640 are disposed. For example, the shield 650 may be embodied in an area that is somewhat larger than the area of the plane in which the

coils

610, 630, and 640 are disposed, and has a shape similar to the plane. , 640 to shield the magnetic field radiated from.

When the shielding material 650 is attached to the coil frame 620, a method such as a separate adhesive sheet (for example, a double-sided tape) may be used, but the scope of the present invention is not limited thereto.

In addition, the shielding member 650 may be provided with a function hole having the same function at a position corresponding to the function hole 622.

The metal sheet 660 may function as a heat sink to maintain the shape of the transmission coil module 600 and to discharge heat generated from the coil to the outside. The metal sheet 660 may be implemented to include aluminum (Al), but the scope of the present invention is not limited thereto.

The metal sheet 660 may be attached to a space corresponding to the metal sheet 660 below the coil frame 620 in the coil frame 620 on which the shielding material 650 is mounted. The metal sheet 660 may be embodied in the same area and shape as that of the planar area of the coil frame 620 except the area to which the fixing hole 621 and the connector 670 are attached.

When the metal sheet 660 is attached to the coil frame 620, a method such as a separate adhesive sheet (for example, a double-sided tape) may be used, but the scope of the present invention is not limited thereto.

In addition, the metal sheet 660 may be provided with a function hole having a same function at a position corresponding to the function hole 622.

The shield 650 and the metal sheet 660 may be disposed in the coil frame 620. That is, the area of the storage space corresponding to the shield 650 and the metal sheet 660 of the coil frame 620 may be at least larger than the area of each of the shield 650 and the metal sheet 660.

The connector 670 allows the

coils

610, 630, 640 to be connected to an external control circuit board through the coil frame 620. The connector 670 may be implemented as a printed circuit board (PCB), but the scope of the present invention is not limited thereto.

The connector 670 may be attached to a space corresponding to the connector 670 below the coil frame 620 in the coil frame 620 on which the metal sheet 660 is mounted. The planar area of the connector 670 may be equal to the area to which the connector 670 described in the metal sheet 660 will be attached.

One side of the coil frame 620 is inserted (or recessed) inward, and the connector 670 may be disposed on the inserted side. The lead wire insertion terminal 623 is also formed on the inserted side surface.

Connector 670 may include a substrate and at least one pin (eg, twelve pins) inserted into the substrate. An inner portion of the substrate may be attached to the lower portion of the coil frame 620. At least one pin is inserted into an outer portion of the substrate, and each of the at least one pin includes an upper connection portion (or an upper terminal) connected to a lead wire of the

coils

610, 630, and 640, and a control circuit board and a

coil

610, 630. , 640 may include a lower connection part (or lower terminal) connected to the control circuit board to be electrically connected.

An inner portion of the connector 670 may be attached to overlap with at least a portion of the lead wire insertion terminal 623 of the coil frame 620. For this reason, the lead wires of the

coils

610, 630, and 640 inserted into the lead wire insertion terminal 623 may be fixed.

The upper terminal of the connector 670 may be connected to the lead wire of each of the

coils

610, 630, and 640 mounted on the coil frame 620, and the lower terminal of the connector 670 may be connected to the corresponding terminal of the control circuit board. have. In detail, the upper terminal and the lower terminal of the connector 670 may be implemented with a total of 12 pins corresponding to each other. A total of 6 lead wires of each of the

coils

610, 630, and 640 may correspond to one of the 12 pins. It may be connected to two adjacent pins of the position respectively. Accordingly, twelve pins of the lower terminal may be connected to one of the six lead wires adjacent to each other to connect the

coils

610, 630, and 640 to the control circuit board.

In this case, the lead wire and the two pins may be connected by a laser solder method, but the scope of the present invention is not limited thereto.

In addition, when the connector 670 is attached to the coil frame 620, a method such as a separate adhesive sheet (for example, a double-sided tape) may be used, but the scope of the present invention is not limited thereto.

In the present specification, the upper portion may mean a side relatively close to the interface surface on which the wireless power receiver can be placed.

Beads

615, 635, and 645 may be inserted into each lead of each

coil

610, 630, and 640. The

beads

615, 635, and 645 remove a high frequency noise flowing into each lead. can do.

Since the

beads

615, 635, and 645 are inserted into the respective lead wires, the cross section of each lead wire includes a conductive material and an insulating material surrounding the conductive material, thereby beading the insulating material and the

conductive material

615, 635, 645. ), But may be a method in which

beads

615, 635, and 645 are inserted and connected to the removed area, but the scope of the present invention is not limited thereto.

FIG. 7 illustrates an embodiment of the bead shown in FIG. 6 in more detail.

Referring to FIG. 7, the

beads

615, 635, and 645 of FIG. 6 may be inserted in a circuit to remove high frequency noise. In general, since the noise is higher in frequency than the signal (wireless power signal or various control signals), the

beads

615, 635, and 645 may be included to effectively remove the noise having a high frequency.

7 shows a bead 700 that simplifies any of the

beads

615, 635, 645. Bead 700 may be coupled between

coils

610, 630, 640 and connector 670.

The bead 700 may include an inductor L and a resistor R connected in parallel. Here, the resistance value of the resistor R has a sufficiently large value (it is difficult for a low frequency signal to pass) and the inductor L has an impedance proportional to the frequency.

Therefore, when the signal transmitted between the

coils

610, 630, 640 and the connector 670 is a low frequency component, the signal passes through the inductor L having an impedance lower than the resistance R.

On the contrary, when the signal transmitted between the

coils

610, 630, 640 and the connector 670 is a high frequency component, the signal passes through the resistor R rather than the inductor L having a high impedance in proportion to the frequency. do. However, the high frequency signal is absorbed and released as heat through the resistor R having a sufficiently large resistance value.

In conclusion, the bead 700 may remove high frequency noise passing through each lead of the

coils

610, 630, and 640.

Referring to FIG. 8, the connector 800 may be implemented as a PCB, and further includes an embedded circuit 820 capable of performing the functions of the

beads

615, 635, and 645 in the embodiment of FIG. 6. can do. That is, when the connector 800 is included instead of the connector 670 of FIG. 6, the

beads

615, 635, and 645 may be excluded from the transmission coil module 600.

According to an embodiment, although the connector 800 is included instead of the connector 670 of FIG. 6, the

beads

615, 635, 645 are included in the transmission coil module 600 to perform the removal of high frequency noise with higher efficiency. It may be.

Beads

615, 635, 645 or embedded circuit 820 may be defined as noise cancellation circuits.

Connector 800 may include pin 810 and embedded circuit 820.

The pins 810 may include first pins 1 to 12 pins 12, and each of the first pins 1 to 12 pins 12 may include an upper terminal and a lower terminal described with reference to FIG. 6. Can be. That is, a total of six lead wires of each of the

coils

610, 630, and 640 may be connected to two adjacent pins of corresponding positions among the first pins 1 to 12 pins 12, respectively.

For example, one of the lead wires of the second coil 630 may be connected to the first pin 1 and the second pin 2, and the other may be connected to the third pin 3 and the fourth pin 4. One of the lead wires of the first coil 610 may be connected to the fifth pin 5 and the sixth pin 6, and the other may be connected to the seventh pin 7 and the eighth pin 8. One of the lead wires of the coil 640 may be connected to the ninth pin 9 and the tenth pin 10, and the other may be connected to the eleventh pin 11 and the twelfth pin 12. This is only an example, and the pins connected to specific leads of a specific coil may be changed.

Accordingly, each of the lower terminals of the first pin 1 to the twelfth pin 12 is connected to any one of the six lead wires adjacent to each other so that the

coils

610, 630, and 640 are electrically connected to the control circuit board. Can be connected.

In addition, the pin 810 may include additional pins other than the first pin 1 to the twelfth pin 12, and may electrically connect the thermistor of the transmission coil module 600 to the lower control circuit board.

The embedded circuit 820 may include embedded circuits EC1, EC2, and EC3 corresponding to each coil. Like the bead 700 of FIG. 7, the embedded circuit 820 may remove high frequency noise. An operation related thereto will be described later with reference to FIG. 9.

The embedded circuit 820 may be disposed on the bottom surface of the connector 800 relatively far from the interface surface on which the wireless power receiver can be placed, but the scope of the present invention is not limited thereto.

For example, the first embedded circuit EC1 corresponds to the first coil 610, the second embedded circuit EC2 corresponds to the second coil 630, and the third embedded circuit EC3 corresponds to the third coil ( 640 may correspond.

In addition, each of the first to third embedded circuits EC1 to EC3 may be connected to both ends of a lead wire of a corresponding coil. To this end, each of the first to third embedded circuits EC1 to EC3 may be electrically connected to a pin corresponding to the lead wire on the connector 800.

For example, the first embedded circuit EC1 is connected to the fifth pin 5 and the sixth pin 6 so as to be connected to both ends of the lead wire of the first coil 610, and the seventh pin 7 and the seventh pin. It may be connected to the 8 pin (8).

The electrical connection between the embedded circuit 820 itself and the embedded circuit 820 and the pins 810 may be simply implemented on the connector 800 implemented as a PCB substrate.

Referring to FIG. 9, each of the first embedded circuit EC1 to the third embedded circuit EC3 may be implemented with one capacitor. The capacitor has an impedance that is inversely proportional to frequency.

The first embedded circuit EC1 is connected to the fifth pin 5 and the sixth pin 6, and is connected to the left lead wire of the first coil 610, and the seventh pin 7 and the eighth pin 8. It may be connected to the right lead wire of the first coil 610.

The second embedded circuit EC2 is connected to the first pin 1 and the second pin 2, and is connected to the left lead wire of the second coil 630, and the third pin 3 and the fourth pin 4. May be connected to the right lead wire of the second coil 630.

The third embedded circuit EC3 is connected to the ninth pin 9 and the tenth pin 10, and is connected to the left lead wire of the third coil 640, and the eleventh pin 11 and the twelfth pin 12. May be connected to the right lead wire of the third coil 640.

That is, each of the first embedded circuit EC1 to the third embedded circuit EC3 may be connected and inserted in parallel between both leads of the corresponding coil.

Hereinafter, an operation of each of the first embedded circuit EC1 to the third embedded circuit EC3 implemented as a capacitor will be described.

When the signal transmitted between the

coils

610, 630, 640 and the connector 800 is a low frequency component, the capacitor is open and the signal is transmitted and received regardless of the capacitor.

In contrast, when the signal transmitted between the

coils

610, 630, 640 and the connector 800 is a high frequency component, the capacitor has a low impedance in inverse proportion to the frequency, and the signal flows through the low impedance capacitor. do. The capacitor operates as a resistor having a specific impedance, and the high frequency signal is absorbed by the capacitor and released as heat.

As a result, the first embedded circuit EC1 to the third embedded circuit EC3 may remove high frequency noise passing through each of the leads of the

coils

610, 630, and 640.

According to the wireless power transmitter according to the exemplary embodiment of the present invention, the high frequency noise can be more effectively removed by implementing a circuit capable of removing the high frequency noise on the transmitting coil side.

By providing a noise removing circuit directly on the transmitting coil side rather than the control circuit board, it is possible to remove noise in advance with respect to the signal transmitted from the transmitting coil to the control circuit board, thereby preventing malfunction of the control circuit board, and from the control circuit board. This is because the noise introduced during the transmission of the signal to the transmitting coil can be effectively removed.

In the present specification, the wireless power transmitter has been described, but the scope of the present invention is not limited thereto. The wireless power receiver may include a circuit capable of removing high frequency noise at a receiving coil. In this case, the receiving coil may also be connected to the control circuit board through the connector, and it is natural that the wireless power receiver may include an embedded circuit included in the bead or connector inserted into the lead wire of the receiving coil.

The method according to the embodiment described above may be stored in a computer-readable recording medium that is produced as a program for execution on a computer, and examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape , Floppy disks, optical data storage devices, and the like, and also include those implemented in the form of carrier waves (eg, transmission over the Internet).

The computer readable recording medium can be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the above-described method may be easily inferred by programmers in the art to which the embodiments belong.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

Accordingly, the above detailed description should not be construed as limiting in all aspects and 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.

The present invention relates to a wireless charging technology, and can be applied to a wireless power transmitter for transmitting power wirelessly and a wireless power receiver for receiving power wirelessly.

Claims

A transmission coil for wirelessly transmitting power;

A connector to electrically connect the circuit board controlling the transmitting coil and the transmitting coil; And

And a noise removing circuit inserted between a lead coil of the transmitting coil and the high frequency noise between the transmitting coil and the connector.
The method of claim 1,

The noise removal circuit is,

And a bead connected in series with a lead of the transmitting coil.
The method of claim 2,

The bead includes an inductor and a resistor connected in parallel with each other,

When the signal applied to the transmitting coil is a high frequency, the resistor absorbs the signal to remove the high frequency noise.
The method of claim 1,

The connector,

Board; And at least one pin inserted on the substrate,

The at least one pin may include an upper connection part connected to a lead wire of the transmission coil; And a lower connection part connected to the circuit board such that the circuit board and the transmitting coil are electrically connected to each other.
The method of claim 1,

A coil frame including an accommodating portion into which the transmitting coil is inserted and a lead wire insertion terminal into which the lead wire is inserted;

A shielding material for shielding a magnetic field generated from the transmitting coil; And

The wireless power transmitter further comprises a metal sheet for dissipating heat generated by the transmitting coil to the outside.
A transmission coil for wirelessly transmitting power; And

A circuit board for controlling the transmitting coil and a connector for electrically connecting the transmitting coil,

The connector includes a noise removing circuit connected between a pin to which the first lead of the transmitting coil is connected and a pin to which the second lead of the transmitting coil is connected to remove high frequency noise.
The method of claim 6,

The noise canceling circuit is a capacitor,

And the capacitor absorbs the signal to remove the high frequency noise when the signal applied to the transmitting coil is a high frequency.
The method of claim 6,

The noise canceling circuit is an embedded circuit mounted on the connector implemented as a printed circuit board (PCB),

And a wireless power transmitter disposed on a bottom surface of the connector relatively far from an interface surface on which a wireless power receiver can be placed.
The method of claim 6,

The connector,

Board; And at least one pin inserted on the substrate,

The at least one pin may include an upper connection part connected to a lead wire of the transmission coil; And a lower connection part connected to the circuit board such that the circuit board and the transmitting coil are electrically connected to each other.
The method of claim 6,

A coil frame including an accommodating portion into which the transmitting coil is inserted and a lead wire insertion terminal into which the lead wire is inserted;

A shielding material for shielding a magnetic field generated from the transmitting coil; And

The wireless power transmitter further comprises a metal sheet for dissipating heat generated by the transmitting coil to the outside.
A receiving coil for wirelessly receiving power;

A connector for electrically connecting the circuit board controlling the receiving coil and the receiving coil; And

And a noise removal circuit inserted between a lead coil of the receiver coil and the high frequency noise between the receiver coil and the connector.
The method of claim 11,

The noise canceling circuit includes an inductor and a resistor connected in series with the lead wire and connected in parallel with each other,

When the signal applied to the receiving coil is a high frequency, the resistor absorbs the signal to remove the high frequency noise.
The method of claim 11,

The connector, the substrate; And at least one pin inserted on the substrate, wherein the at least one pin includes: an upper connection part connected to a lead wire of the receiving coil; And a lower connection part connected to the circuit board such that the circuit board and the receiving coil are electrically connected to each other.

The wireless power receiver may include a coil frame including a receiving part into which the receiving coil is inserted and a lead wire insertion terminal into which the lead wire is inserted;

A shielding material for shielding a magnetic field generated from the receiving coil; And

The wireless power receiver further comprises a metal sheet for dissipating heat generated by the receiving coil to the outside.
A receiving coil for wirelessly receiving power; And

A connector for electrically connecting the circuit board controlling the receiving coil and the receiving coil,

The connector includes a noise removing circuit connected between a pin to which the first lead of the receiving coil is connected and a pin to which the second lead of the receiving coil is connected to remove high frequency noise.
The method of claim 14,

The noise canceling circuit is a capacitor,

When the signal applied to the receiving coil is a high frequency, the capacitor absorbs the signal to remove the high frequency noise,

The connector, the substrate; And at least one pin inserted on the substrate, wherein the at least one pin includes: an upper connection part connected to a lead wire of the receiving coil; And a lower connection part connected to the circuit board such that the circuit board and the receiving coil are electrically connected to each other.

The wireless power receiver may include a coil frame including a receiving part into which the receiving coil is inserted and a lead wire insertion terminal into which the lead wire is inserted;

A shielding material for shielding a magnetic field generated from the receiving coil; And

The wireless power receiver further comprises a metal sheet for dissipating heat generated by the receiving coil to the outside.