KR20190076517A - Wireless Charging Apparatus With Enhanced Quality Factor - Google Patents

Abstract

The present invention relates to a wireless charging apparatus having an improved quality factor. A wireless power transmitter according to an embodiment of the present invention includes a primary coil unit for transmitting a wireless power signal, a first shielding unit made of ferrite, and a shielding unit disposed between the first shielding unit and the primary coil unit and including a second shielding unit made of nanocrystal material. The thickness of the second shielding unit can be 0.2 mm or more. The thickness of the first shielding unit can be 1.0 mm or more. Therefore, the present invention has an advantage of providing a wireless charging device with improved foreign matter detection capability.

Description

Technical Field [0001] The present invention relates to a wireless charging apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission technology, and more particularly, to a wireless charging device having an improved quality factor value.

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

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

The wireless power transmission technology (wireless power transmission or wireless energy transfer) is a technology to transmit electric energy from the transmitter to the receiver wirelessly using the induction principle of the magnetic field. In the 1800s, electric motor or transformer And thereafter, a method of transmitting electrical energy by radiating electromagnetic waves such as high frequency, microwave, and laser has also been attempted.

Our electric toothbrushes and some wireless shavers are actually charged with electromagnetic induction.

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

In the magnetic induction method, when two coils are adjacent to each other and a current is supplied to one coil, a magnetic flux generated at this time causes an electromotive force to the other coils. As a technology, .

The magnetic induction method has the disadvantage that it can transmit power of up to several hundred kilowatts (kW) and the efficiency is high, but the maximum transmission distance is 1 centimeter (cm) or less, so it is usually adjacent to the charger or the floor.

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

Short wavelength wireless power transmission - simply, RF transmission - takes advantage of the fact that energy can be transmitted and received directly in radio wave form.

This technology is a RF power transmission system using a rectenna. Rectena is a combination of an antenna and a rectifier, which means a device that converts RF power directly into direct current power.

That is, the RF method is a technique of converting an AC radio wave into DC and using it. Recently, as the efficiency has improved, commercialization has been actively researched.

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

2. Description of the Related Art [0002] As wireless charging apparatuses are applied to devices in various fields, a wireless power transmission apparatus capable of simultaneously charging a plurality of wireless power receivers, a wireless power transmission apparatus equipped with an NFC (Near Field Communication) Research on devices is also actively under way.

In wireless charging, the Quality Factor value can be used to determine whether a foreign substance is present on the charging area.

The wireless power transmission apparatus compares a quality factor threshold determined based on a reference quality factor value received from the wireless power receiving apparatus with a measured quality factor value before entering the power transmission stage It is possible to judge whether or not there is foreign matter on the interface surface.

However, when the quality factor value measured in accordance with the wireless power receiver disposed on the interface surface is too low, it is not easy to detect foreign matter using the quality factor threshold.

It is an object of the present invention to provide wireless charging devices with improved quality factor values.

Another object of the present invention is to provide a radio power transmission apparatus with improved foreign matter detection capability.

Another object of the present invention is to provide a wireless power receiving apparatus having an improved quality factor value.

It is still another object of the present invention to provide a wireless power transmitting apparatus capable of detecting foreign matter even when a wireless power receiver provided with a composite type coil unit is disposed on an interface surface.

It is still another object of the present invention to provide a wireless power transmission apparatus capable of detecting foreign matter even when a wireless power receiver equipped with a high capacity battery is disposed on an interface surface.

It is still another object of the present invention to provide a radio power transmission apparatus with improved foreign matter detection capability.

It is another object of the present invention to provide a wireless charging system with improved foreign matter detection capability.

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

The present invention can provide wireless charging devices with improved quality factor values.

A wireless power transmitter according to an embodiment of the present invention includes a primary coil unit for transmitting a wireless power signal, a first shielding unit made of a ferrite material, a first shielding unit made of a nano-crystal material Wherein the thickness of the second shielding unit is 0.2 mm or more, and the thickness of the first shielding unit is 1.0 mm or more.

Here, the second shielding unit may be a plurality of the nano-crystal alloy sheets.

The material and thickness of the first shielding unit and the second shielding unit may be the same as the capacity of the battery of the wireless power receiver and the capacity of the battery of the wireless power receiver. May be determined based on at least one of the antenna configurations of the secondary coil unit being deployed.

Here, the antenna configuration may include a single type configuration including only a wireless charging antenna, and a complex type configuration including the wireless charging antenna and the short-range wireless communication antenna.

The wireless power transmitter may further include a metal sheet disposed on the opposite side of the first shielding unit to the second shielding unit.

Here, the metal sheet may be made of aluminum.

Effects of the method, apparatus and system according to the present invention will be described as follows.

The present invention has the advantage of providing wireless charging devices with improved quality factor values.

In addition, the present invention has an advantage of providing a radio power transmission apparatus with improved foreign matter detection capability.

Further, the present invention is advantageous in providing a wireless power receiving apparatus having an improved quality factor value.

The present invention is also advantageous in that it provides a wireless power transmission device capable of detecting foreign matter even if a wireless power receiver equipped with a composite type coil unit is disposed on the interface surface.

In addition, the present invention has an advantage of providing a radio power transmission apparatus with improved foreign matter detection capability.

Further, the present invention is advantageous in that it provides a wireless power transmission apparatus capable of detecting foreign matter even if a wireless power receiver equipped with a high capacity battery is disposed on the interface surface.

In addition, the present invention has an advantage of providing a wireless charging system with improved foreign matter detection capability.

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

1 is a block diagram illustrating a wireless charging system according to an embodiment of the present invention.
2 is a block diagram illustrating a wireless charging system according to another embodiment of the present invention.
3 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment of the present invention.
4 is a block diagram illustrating a structure of a wireless power receiver interworking with the wireless power transmitter of FIG.
5 is a state transition diagram for explaining a wireless power transmission procedure according to an embodiment of the present invention.
6 to 10B are views for explaining a stacking structure of a transceiver for quality factor measurement in a wireless charging system according to an embodiment of the present invention.
11 to 14C are experimental result tables showing the change in the quality factor value according to various configurations of the transceiver.
15 is a diagram for explaining a method of measuring a quality factor value in a wireless power transmitter according to an embodiment of the present invention.

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

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

In the description of the embodiments, an apparatus equipped with a function of transmitting wireless power on a wireless charging system includes a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a wireless power transmitter, a transmitter, a transmitter, , A transmitting side, a wireless power transmission device, a wireless power transmitter, and the like are used in combination. Further, for the sake of convenience of explanation, it is to be understood that a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a wireless power receiving apparatus, a receiving terminal, a receiving side, A receiver, a receiver, and the like can be used in combination.

The transmitter according to the present invention may be configured as a pad type, a cradle type, an access point (AP) type, a small base type, a stand type, a ceiling embedded type, a wall type, Power can also be transmitted.

To this end, the transmitter may comprise at least one radio power transmission means.

Here, the radio power transmitting means may be various non-electric power transmission standards based on an electromagnetic induction method in which a magnetic field is generated in a power transmitting terminal coil and charged using an electromagnetic induction principle in which electricity is induced in a receiving terminal coil under the influence of the magnetic field.

Here, the wireless power transmission means may include an electromagnetic induction wireless charging technique defined by Wireless Power Consortium (WPC) and Power Matters Alliance (PMA), which are standard wireless charging technologies.

Also, a receiver according to an embodiment of the present invention may include at least one wireless power receiving means, and may receive wireless power from two or more transmitters at the same time.

Here, the wireless power receiving means may include an electromagnetic induction wireless charging technique defined in a Wireless Power Consortium (WPC) Qi standard and a Power Matters Alliance (PMA) standard, which are standard wireless charging technologies.

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

A receiver according to an embodiment of the present invention may be provided with an NFC device, for example, an NFC tag (Tag).

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

Referring to FIG. 1, the wireless charging system includes a wireless power transmission terminal 10 for wirelessly transmitting power, a wireless power receiving terminal 20 for receiving the transmitted power, and an electronic device 30 Lt; / RTI >

For example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 can perform in-band communication in which information is exchanged using the same frequency band as that used for wireless power transmission.

In another example, the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 perform out-of-band communication in which information is exchanged using a different frequency band different from the operating frequency used for wireless power transmission .

For example, information exchanged between the wireless power transmitting terminal 10 and the wireless power receiving terminal 20 may include control information as well as status information of each other. Here, the status information and the control information exchanged between the transmitting and receiving end will become more apparent through the description of the embodiments to be described later.

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

 For example, the unidirectional communication may be that the wireless power receiving terminal 20 transmits information only to the wireless power transmitting terminal 10, but the present invention is not limited thereto, and the wireless power transmitting terminal 10 may transmit information Lt; / RTI >

In the half duplex communication mode, bidirectional communication is possible between the wireless power receiving terminal 20 and the wireless power transmitting terminal 10, but information can be transmitted only by any one device at any time.

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

In particular, the wireless power transmitting terminal 10 according to an embodiment of the present invention can transmit a predetermined packet indicating whether or not to support fast charging to the wireless power receiving terminal 20.

The wireless power receiving terminal 20 can inform the electronic device 30 of the connected wireless power transmitting terminal 10 when it is confirmed that it supports the fast charging mode. The electronic device 30 may indicate that fast charging is possible through a predetermined display means, which may be, for example, a liquid crystal display.

Also, the user of the electronic device 30 may select the predetermined fast charge request button displayed on the liquid crystal display means to control the wireless power transmitting terminal 10 to operate in the fast charge mode.

In this case, the electronic device 30 can transmit a predetermined fast charge request signal to the wireless power receiving terminal 20 when the quick charge request button is selected by the user.

The wireless power receiving terminal 20 may generate a charging mode packet corresponding to the received fast charging request signal and transmit the same to the wireless power transmitting terminal 10 to switch the general low power charging mode to the fast charging mode.

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

For example, as shown in 200a, the wireless power receiving terminal 20 may include a plurality of wireless power receiving devices, and a plurality of wireless power receiving devices may be connected to one wireless power transmitting terminal 10, Charging may also be performed.

Here, the wireless power transmitting terminal 10 can distribute power to a plurality of wireless power receiving apparatuses in a time division manner, but it is not limited thereto. In another example, the wireless power transmitting terminal 10 can distribute power to a plurality of wireless power receiving apparatuses using different frequency bands allocated to the wireless power receiving apparatuses.

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

As another example, as shown in 200b, the wireless power transmitting terminal 10 may be composed of a plurality of wireless power transmitting apparatuses.

In this case, the wireless power receiving terminal 20 may be connected to a plurality of wireless power transmission apparatuses at the same time, and may simultaneously receive power from connected wireless power transmission apparatuses to perform charging.

At this time, the number of wireless power transmission devices connected to the wireless power receiving terminal 20 is adaptively set based on the required power of the wireless power receiving terminal 20, the battery charging state, the power consumption amount of the electronic device, Can be determined.

3 is a block diagram illustrating a structure of a wireless power transmitter according to an embodiment of the present invention.

3, the wireless power transmitter 300 may include a power conversion unit 310, a power transmission unit 320, a communication unit 330, a control unit 340, and a sensing unit 350 . It should be noted that the configuration of the wireless power transmitter 300 described above is not necessarily an essential configuration, but may be configured to include more or less components.

3, when the DC power is supplied from the power supply unit 360, the power converting unit 310 may convert the DC power into AC power of a predetermined intensity.

The power converter 310 may include a DC / DC converter 311, an inverter 312, and a frequency generator 313.

Here, the inverter 312 may be a half bridge inverter or a full bridge inverter. However, the present invention is not limited thereto, and a circuit configuration capable of converting DC power into AC power having a specific operating frequency is sufficient.

The DC / DC converting unit 311 may convert DC power supplied from the power supply unit 350 into DC power having a specific intensity according to a control signal of the controller 340.

At this time, the sensing unit 350 may measure the voltage / current of the DC-converted power and provide the measured voltage / current to the control unit 340.

In addition, the sensing unit 350 may measure the internal temperature of the wireless power transmitter 300 and may provide the measurement result to the controller 340 to determine whether overheating occurs.

For example, the control unit 340 may adaptively cut off the power supply from the power supply unit 350 or block the supply of power to the inverter 312 based on the voltage / current value measured by the sensing unit 350 .

To this end, a power cutoff circuit for shutting off the power supplied from the power supply unit 350 or cutting off the power supplied to the inverter 312 may be further provided at one side of the power conversion unit 310.

The inverter 312 may convert the DC / DC converted DC power into AC power based on a reference AC signal generated by the frequency generator 313, e.g., a pulse width modulated signal. At this time, the frequency of the reference AC signal may be changed dynamically according to the control signal of the controller 340.

The wireless power transmitter 300 according to an exemplary embodiment of the present invention may adjust the operating frequency to adjust the intensity of the transmitted power.

For example, the control unit 340 may receive the power reception state information and / or the power control signal of the wireless power receiver through the communication unit 330 and may receive the power control information based on the received power reception state information or (and) So that the intensity of the transmitted power can be adjusted.

For example, the power reception status information may include, but is not limited to, the intensity information of the rectifier output voltage, the intensity information of the current applied to the reception coil, and the like. The power control signal may include a signal for requesting power increase, a signal for requesting power reduction, and the like.

The power transmitting unit 320 may be configured to include a multiplexer 321 (or a multiplexer), a transmitting coil unit 322, and the like. Here, the transmission coil section 322 may be composed of first to n-th transmission coils.

In addition, the power transmitting unit 320 may further include a carrier generator (not shown) for generating a specific carrier frequency for power transmission. In this case, the carrier generator may generate a specific carrier frequency for mixing with the output AC power of the inverter 312 transmitted via the multiplexer 321.

It should be noted that one embodiment of the present invention may have different frequencies of AC power delivered to each transmit coil.

In 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 controlling LC resonance characteristics for different transmission coils.

The multiplexer 321 may perform a switch function to transmit AC power to the transmission coil selected by the controller 340. [ The controller 340 may select a transmission coil to be used for power transmission to the corresponding wireless power receiver based on a predetermined signal strength indicator received from the wireless power receiver for each transmission coil.

The controller 340 according to an embodiment of the present invention may transmit power by time division multiplexing for each transmission coil when a plurality of wireless power receivers are connected.

For example, if three wireless power receivers-i. E., The first through third wireless power receivers-are each identified through three different transmit coils-i. E., First through third transmit coils-in the wireless power transmitter 300 , The control unit 340 may control the multiplexer 321 to control the AC power to be transmitted only through a specific transmission coil in a specific time slot.

At this time, the amount of power transmitted to the corresponding wireless power receiver can be controlled according to the length of the time slot allocated for each transmission coil, but this is only one embodiment. DC power of the DC / DC converter 311 to control the transmission power of each wireless power receiver.

The control unit 340 may control the multiplexer 321 so that the detection signals may be sequentially transmitted through the first to n-th transmission coils 322 during the first detection signal transmission procedure.

At this time, the control unit 340 can identify the time when the detection signal is transmitted using the timer 355. When the detection signal transmission time arrives, the control unit 340 controls the multiplexer 321 to output the detection signal through the corresponding transmission coil It can be controlled to be transmitted.

For example, the timer 350 can transmit a specific event signal to the control unit 340 at predetermined intervals during the step of transmitting the detection signal. The controller 340 controls the multiplexer 321 So that a specific sensing signal can be transmitted through the corresponding transmission coil.

In addition, the control unit 340 may receive a predetermined transmission coil identifier for identifying a signal strength indicator (Signal Strength Indicator) through a transmission coil from the demodulation unit 332 during the first detection signal transmission procedure, Lt; / RTI > received signal strength indicator.

The control unit 340 controls the multiplexer 321 to transmit the detection signal only through the transmission coil (s) on which the signal strength indicator is received during the first detection signal transmission procedure You may.

In another example, when there are a plurality of transmit coils in which the signal strength indicator is received during the first differential sense signal transmission procedure, the control unit 340 transmits the transmit coil, which receives the signal strength indicator having the largest value, In the procedure, the detection signal may be determined as a transmission coil to be transmitted first, and the multiplexer 321 may be controlled according to the determination result.

The communication unit 330 may include at least one of a modulation unit 331 and a demodulation unit 332.

The modulator 331 may modulate the control signal generated by the controller 340 and transmit the modulated control signal to the multiplexer 321. Here, the modulation scheme for modulating the control signal includes a frequency shift keying (FSK) modulation scheme, a Manchester coding modulation scheme, a phase shift keying (PSK) modulation scheme, a pulse width modulation scheme, A differential bi-phase modulation method, and the like.

When a specific signal is detected through the transmission coil, the demodulation unit 332 can demodulate the detected signal and transmit the demodulated signal to the control unit 340. Here, the demodulated signal may include a signal strength indicator, an error correction (EC) indicator for power control during wireless power transmission, an end of charge indicator (EOC), an overvoltage / overcurrent / overheat indicator, But is not limited to, various status information for identifying the status of the wireless power receiver.

In addition, the demodulator 332 can identify which of the transmit coils the demodulated signal is received, and provide the controller 340 with a predetermined transmit coil identifier corresponding to the identified transmit coil.

 The demodulation unit 332 can demodulate the signal received through the transmission coil 323 and transmit the demodulated signal to the control unit 340. In one example, the demodulated signal may include, but is not limited to, a signal strength indicator, and the demodulated signal may include various status information of the wireless power receiver.

In one example, the wireless power transmitter 300 may acquire the signal strength indicator via in-band communication that uses the same frequency used for wireless power transmission to communicate with the wireless power receiver.

In addition, the wireless power transmitter 300 may transmit wireless power using the transmit coil portion 322, as well as exchange various control signals and status information with the wireless power receiver through the transmit coil portion 322 . As another example, a separate coil corresponding to each of the first to n-th transmission coils of the transmission coil part 322 may be additionally provided in the wireless power transmitter 300, and wireless power It should be noted that it may also perform in-band communication with the receiver.

In the description of FIG. 3, the wireless power transmitter 300 and the wireless power receiver perform in-band communication. However, the wireless power transmitter 300 is only one embodiment, Directional communication through different frequency bands.

For example, the near-end bi-directional communication may be any one of low-power Bluetooth communication, RFID communication, UWB communication, and Zigbee communication.

3, the power transmission unit 320 of the wireless power transmitter 300 includes a multiplexer 321 and a plurality of transmission coils 322, but this is merely one embodiment, It should be noted that the power transmission unit 320 according to the embodiment may be composed of one transmission coil.

In this case, the power transfer section 320 may not include a multiplexer 321 or a coil selection circuit (not shown) for selecting a transmission coil.

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

4, the wireless power receiver 400 includes a receiving coil 410, a rectifier 420, a DC / DC converter 430, a load 440, a sensing unit 450, 460, and a main control unit 470. Here, the communication unit 460 may include at least one of a demodulation unit 461 and a modulation unit 462.

Although the wireless power receiver 400 shown in the example of FIG. 4 is shown as being capable of exchanging information with the wireless power transmitter 300 through in-band communication, this is only one embodiment, The communication unit 460 according to another embodiment of the present invention may provide short-range bidirectional communication through a frequency band different from the frequency band used for wireless power signal transmission.

The AC power received through the receive coil 410 may be delivered to the rectifier 420. The rectifier 420 may convert the AC power to DC power and transmit it to the DC / DC converter 430. The DC / DC converter 430 may convert the intensity of the rectifier output DC power to a specific intensity required by the load 440 and then forward it to the load 440.

The sensing unit 450 may measure the intensity of the DC power output from the rectifier 420 and may provide the measured DC power to the main control unit 470. In addition, the sensing unit 450 may measure the intensity of the current applied to the reception coil 410 according to the wireless power reception, and may transmit the measurement result to the main control unit 470. The sensing unit 450 may measure the internal temperature of the wireless power receiver 400 and provide the measured temperature value to the main control unit 470.

For example, the main control unit 470 may compare the measured rectifier output DC power with a predetermined reference value to determine whether an overvoltage is generated. As a result of the determination, if an overvoltage is generated, a predetermined packet indicating that an overvoltage has occurred can be generated and transmitted to the modulator 462.

Here, the signal modulated by the modulator 462 may be transmitted to the wireless power transmitter 300 through the receiving coil 410 or a separate coil (not shown).

The main control unit 470 can determine that the detection signal has been received when the intensity of the rectifier output DC power is equal to or greater than a predetermined reference value and when the signal strength indicator corresponding to the detection signal is received by the modulation unit 462 To be transmitted to the wireless power transmitter 300 via the wireless network.

The demodulation unit 761 demodulates the AC power signal between the reception coil 410 and the rectifier 420 or the DC power signal output from the rectifier 420 to identify whether or not the detection signal is received, (470). ≪ / RTI >

At this time, the main control unit 470 may control the signal intensity indicator corresponding to the detection signal to be transmitted through the modulation unit 462. [

5 is a state transition diagram for explaining a wireless power transmission procedure in a wireless power transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 5, a wireless power transmission procedure for wireless charging includes a selection phase 510, a ping phase 520, an identification and configuration phase 530, a negotiation phase A Negotiation Phase 540, a Calibration Phase 550, a Power Transfer Phase 560, and a Renegotiation Phase 570.

If the transmitter detects a specific error or a specific event in any of the steps except the selection step 510 among the steps included in the wireless power transmission procedure, the transmitter may return to the selection step 510. Here, the specific error and the specific event will become clear through the following description.

Also, in a selection step 510, the transmitter may monitor whether an object is present on the interface surface-for example, a charging area or a filling bed.

If the transmitter detects that an object has been placed on the interface surface, it may transition to a ping step 520. In the selection step 510, the transmitter transmits an analog ping signal of a very short pulse and, based on the current change of the transmission coil or the primary coil, It is possible to detect whether or not there is an error.

At step 520, the transmitter activates the receiver when an object is detected, and transmits a digital ping to identify whether the receiver is a WPC compliant receiver.

If the transmitter does not receive a response signal to the digital ping (e. G., A signal strength packet) from the receiver in step 520, then the receiver may transition back to step 510 again. Also, in the step of the ping 520, the transmitter may transition to the selection step 510 upon receiving a signal indicating that the power transmission has been completed from the receiver, that is, the charge completion packet.

Once the ping step 520 is complete, the transmitter may transition to an identification and configuration step 530 for identifying the receiver and collecting receiver configuration and status information.

In the identifying and configuring step 530, the transmitter determines whether a packet is received (unexpected packet), a desired packet is not received during a predefined period of time (time out), a packet transmission error, (No power transfer contract) can be made to the selection step 510.

The transmitter may determine whether an entry to the negotiation step 540 is required based on the negotiation field value of the configuration packet that was made in the identification and configuration step 530. [

If it is determined that negotiation is required, the transmitter may enter negotiation step 540 and perform a predetermined FOD detection procedure.

On the other hand, if it is determined that negotiation is not required, the transmitter may immediately enter the power transmission step 560.

At negotiation step 540, the transmitter may receive a Foreign Object Detection (FOD) status packet including a reference quality factor value. At this time, the transmitter can determine a threshold for FO detection based on the reference quality factor value.

The transmitter can detect whether the FO exists in the charging area using the determined threshold value for FO detection and the currently measured quality factor value, and can control the power transmission according to the FO detection result. As an example, if FO is detected, power transmission may be interrupted, but is not limited to this.

If FO is detected, the transmitter may return to selection step 510. If, on the other hand, no FO is detected, the transmitter may enter power transfer step 560 via calibration step 550.

In detail, if the FO is not detected, the transmitter determines the strength of the power received at the receiving end in the correcting step 550 and determines the power loss at the receiving end and the transmitting end to determine the strength of the power transmitted at the transmitting end Can be measured.

The transmitter can predict the power loss based on the difference between the transmit power of the transmitting end and the received power of the receiving end in the correcting step 550. [ A transmitter according to one embodiment may compensate the threshold for FOD detection by reflecting the predicted power loss.

In the power transfer step 540, the transmitter determines whether an undesired packet is received (unexpected packet), a desired packet is received during a predefined period of time (time out), a violation of a predetermined power transmission contract occurs transfer contract violation, and if the charging is completed, the selection step 510 can be performed.

Also, in the power transfer step 440, the transmitter may transition to the renegotiation step 570 if it is necessary to reconfigure the power transfer contract according to the transmitter state change or the like. At this time, if the renegotiation is normally completed, the transmitter may return to power transfer step 560. [

The power transmission contract may be set based on the status and characteristic information of the transmitter and the receiver. In one example, the transmitter status information may include information on the maximum transmittable power, information on available power, information on the maximum acceptable number of receivers, and the receiver status information may include information on the required power, have.

Here, the receiver can determine the required power based on the information about the available power of the transmitter and the currently received power.

If an object is sensed in the selection step 510, the wireless power transmitter may measure the quality factor of the wireless power resonant circuit (e.g., power transfer coil and / or resonant capacitor).

In one embodiment of the present invention, if an object is sensed in a selection step 510, a quality factor may be measured to determine whether a wireless power receiver is placed with the foreign object in the charging area-that is, to detect FO.

The coil included in the wireless power transmitter can be reduced in inductance and / or series resistance component in the coil due to environmental changes, thereby reducing the quality factor value. In order to determine the presence of a foreign object using the measured quality factor value, the wireless power transmitter may receive a pre-measured reference quality factor value from the wireless power receiver without any foreign matter placed in the charging area.

In the negotiation step 540, the reference quality factor value received and the measured quality factor value may be compared to determine whether a foreign substance is present. However, in the case of a radio power receiver with a low reference quality factor value, for example, a particular radio power receiver may have a low reference quality factor value depending on the type, use and characteristics of the radio power receiver, There is no large difference between the quality factor value and the reference quality factor value, so that it is difficult to determine whether or not the foreign substance exists.

In order to solve the above problems, it is important to provide a wireless power receiver having a high reference quality factor value.

FIG. 6 is a view for explaining a stacking structure of a transceiver for quality factor measurement in a wireless charging system according to an embodiment of the present invention. Referring to FIG.

6, the wireless power transmitter 610 includes a primary coil unit 611 and a first shielding unit 612, and the wireless power receiver 620 includes a secondary coil unit 621 and a battery 622 ).

As shown in FIG. 6, the primary coil unit 611 and the secondary coil unit 621 may be arranged to be spaced apart from each other by a predetermined distance dz. For this purpose, an acrylic plate 630 having a thickness dz may be disposed between the primary coil unit 611 and the secondary coil unit 621. Here, dz can be determined differently according to a standard standard applied to the system. In one example, dz can be 2.9 mm.

In an actual implementation, the acrylic plate 630 and the acrylic plate described in the following figures may be used in a charging bed provided in a wireless power transmitter and an external cover, e.g., a battery Such as, but not limited to, a housing back side of an integrated smartphone or a battery cover of a battery detachable smartphone.

The primary coil unit 611 and the secondary coil unit 621 according to an embodiment may be formed of a coil using a Litz wire, but this is only an example and may be applied to a printed circuit board A pattern printed pattern coil or an etching coil etching a copper plate or the like may be used.

The primary coil unit and the secondary coil unit described in the embodiment of FIG. 6 and the drawings described later include at least one of an antenna for wireless charging, an antenna for short-range wireless communication, and an antenna for mobile payment, Lt; / RTI >

In one example, the primary coil unit 611 is composed of a single antenna including an antenna for transmitting radio power, that is, a transmitting coil, and the secondary coil unit 621 is an antenna for receiving radio power, And an antenna for short-range wireless communication, for example, an NFC (Near Field Communication) antenna.

In another example, the primary coil unit 611 and the secondary coil unit 621 may be configured as a single type antenna including a transmitting coil and a receiving coil, respectively.

In another example, the primary coil unit 611 is composed of a complex type antenna including a wireless charging antenna and an antenna for short-range wireless communication, and the secondary coil unit 621 is a single type antenna ≪ / RTI >

In another example, at least one of the primary coil unit 611 and the secondary coil unit 621 may further include a mobile payment antenna for mobile settlement.

The primary coil unit 611 may be configured to include a plurality of transmission coils for wireless charging.

The first shielding unit 612 may be made of a ferrite material, an amorphous material, a nano crystal material, a sandstrut material, or the like.

Preferably, the first shielding unit 612 may be formed of a ferrite material. Here, the thickness of the ferrite may be about 1 mm, but is not limited thereto, and may be implemented to have different thicknesses depending on the type and detailed configuration of the wireless power transmitter 610 and the wireless power receiver 620.

For example, if the secondary coil unit 621 of the wireless power receiver 620 is a hybrid type including a wireless charging antenna and a short-range communication antenna, then the secondary coil unit 621 may be compared to a single type comprising only a wireless charging antenna The thickness of the first shielding unit 612 can be increased.

7 is a view for explaining a lamination structure of a transceiver for quality factor measurement in a wireless charging system according to another embodiment of the present invention.

7, the wireless power transmitter 710 includes a primary coil unit 711 and a first shielding unit 712, and the wireless power receiver 720 includes a secondary coil unit 721, A unit 722 and a battery 723. [

The primary coil unit 711 and the secondary coil unit 721 according to an embodiment may be formed of a coil using a Litz wire, but this is only an example and may be applied to a printed circuit board A pattern printed pattern coil or an etching coil etching a copper plate or the like may be used.

Here, the second shielding unit 722 may be disposed on the opposite surface of the secondary coil unit 721 of the battery 723. [

The size and thickness of the second shielding unit 722 may be determined based on the size or (and) capacity of the battery 723.

As the material of the second shielding unit 722, for example, a ferrite material, an amorphous material, a nano crystal material, a sandstrut material, or the like may be used.

Preferably, the second shielding unit 722 may be formed of a nano-crystal alloy in the form of a ribbon, a sheet, a core, or the like.

In particular, nano-crystal alloys have high magnetic permeability, high saturation magnetic flux density, and low coercive force.

In addition, the nanocrystalline core has a merit of having a minimum circular eddy current loss characteristic since an ultra-thin ribbon is wound to form a cylindrical core and then heat-treated.

In addition, the nanocrystalline alloy has advantages of low power loss, high temperature stability, abrasion resistance and corrosion resistance.

The nano-crystal alloy may be an Fe-based or a crystal alloy composed of a small amount of Cu, Mo, Nb, Ni and Co mixed with Fe, Si and B. Nanocrystalline alloys are superior to the Co-based amorphous alloys of the same performance in terms of magnetic properties and high price competitiveness.

The wireless power receiver 720 according to the present invention can have a high quality factor value by having the second shielding unit 722 between the secondary coil unit 721 and the battery 723. [

Further, the second shielding unit 722 may be attached to one surface of the battery 723 using a specific adhesive member.

The second shielding unit 722 according to one embodiment may have the form of a flat sheet composed of a nano-crystal alloy and may have a thickness of about 0.1 mm, but the present invention is not limited thereto, And may have different thicknesses depending on the thickness.

7, the primary coil unit 711 and the secondary coil unit 721 can be arranged to be spaced apart from each other by a predetermined distance dz. To this end, an acrylic plate 730 having a thickness dz may be disposed between the primary coil unit 711 and the secondary coil unit 721. Here, dz can be determined differently according to a standard standard applied to the system. In one example, dz can be 2.9 mm.

The first shielding unit 712 may be made of a ferrite material, an amorphous material, a nano crystal material, a sandstrut material, or the like.

Preferably, the first shielding unit 712 may be formed of a ferrite material. Here, the thickness of the ferrite may be about 1.6 mm, but is not limited thereto. The thickness of the ferrite used in the first shielding unit 712 according to the type and detailed configuration of the wireless power transmitter 710 and the wireless power receiver 720 The ferrite may be implemented to have a different thickness.

For example, if the secondary coil unit 721 of the wireless power receiver 720 is a hybrid type including a wireless charging antenna and a short-range communication antenna, then the secondary coil unit 621 is compared to a single type comprising only a wireless charging antenna The thickness of the first shielding unit 612 can be increased.

It should be noted that the acrylic plate 730 according to the embodiment of FIG. 7 is an experimental condition for measuring the reference quality factor and is not used in an actual wireless charging system. For example, in an actual wireless charging system, an interface surface may be disposed between the primary coil unit 711 and the secondary coil unit 721. [ Here, the interface surface may be configured on one side of the wireless power transmitter as a charging bed configured to allow the wireless power receiver to be placed in the charging area.

The number of the second shielding units disposed on one side of the battery of the wireless power receiver and / or the thickness of the second shielding unit may be determined according to the internal configuration of the secondary coil unit in this embodiment and the following embodiments.

For example, when the secondary coil unit is a composite antenna, the number of the second shielding units disposed on one side of the battery may be increased or the thickness of the second shielding unit may be increased as compared with a single antenna.

In the present embodiment and the following embodiments, the internal configuration of the secondary coil unit is considered, so that at least one of the material, the number, and the thickness of the first shielding unit disposed in the wireless power transmitter may be determined.

For example, if the secondary coil unit is a single antenna, a ferrite material is used as the material of the first shielding unit, and if the secondary coil unit is a composite antenna, a nano-crystal alloy material may be used as the material of the second shielding unit.

8 is a view for explaining a lamination structure of a transceiver for quality factor measurement in a wireless charging system according to another embodiment of the present invention.

8, the wireless power transmitter 810 includes a primary coil unit 811 and a first shielding unit 812, and the wireless power receiver 820 includes a secondary coil unit 821, A unit 822, a battery 823, and a second metal sheet 824. As shown in Fig.

The primary coil unit 811 and the secondary coil unit 821 according to an embodiment may be formed of a coil using a Litz wire, but this is only an example, A pattern printed pattern coil or an etching coil etching a copper plate or the like may be used.

Here, the second shielding unit 822 may be disposed on the opposite surface of the secondary coil unit 821 of the battery 823. [ For example, the second shielding unit 822 may be made of a ferrite material, an amorphous material, a nano crystal material, a sandstrut material, or the like.

The second shielding unit 822 may be formed of a nano-crystal ribbon, a sheet, a core, or the like.

In particular, nano-crystal alloys have high magnetic permeability, high saturation magnetic flux density, and low coercive force.

In addition, the nanocrystalline core has a merit of having a minimum circular eddy current loss characteristic since an ultra-thin ribbon is wound to form a cylindrical core and then heat-treated. In addition, the nanocrystalline alloy has advantages of low power loss, high temperature stability, abrasion resistance and corrosion resistance.

The nano-crystal alloy may be an Fe-based or a crystal alloy composed of a small amount of Cu, Mo, Nb, Ni and Co mixed with Fe, Si and B. Nanocrystalline alloys are superior to the Co-based amorphous alloys of the same performance in terms of magnetic properties and high price competitiveness.

The wireless power receiver 820 according to the present invention has the second shielding unit 822 disposed on one side of the battery 823 and the second metal sheet 824 disposed on the other side of the battery 823, Lt; / RTI >

The first shielding unit 812 may be made of a ferrite material, an amorphous material, a nano crystal material, a sandstrut material, or the like.

Preferably, the first shielding unit 812 may be implemented as a ferrite material. Here, the thickness of the ferrite may be about 1 mm, but is not limited thereto, and may be implemented to have a different thickness depending on the type and configuration of the wireless power transmitter 810.

In one example, if the secondary coil unit 821 of the wireless power receiver 820 is a hybrid type including a wireless charging antenna and a short-range communication antenna, then the secondary coil unit 821 is compared to a single type comprising only a wireless charging antenna The thickness of the first shielding unit 812 can be increased.

Pure aluminum or an aluminum alloy may be used for the second metal sheet 824, and the thickness of the second metal sheet 824 may be about 0.5 mm.

As shown in FIG. 8, the quality factor value can be measured after the primary coil unit 811 and the secondary coil unit 821 are disposed apart from each other by a predetermined distance dz. For this purpose, an acrylic plate 830 having a thickness dz may be disposed between the primary coil unit 811 and the secondary coil unit 821. Here, dz can be determined differently according to a standard standard applied to the system. In one example, dz can be 2.9 mm.

It should be noted that the acrylic plate 830 according to the embodiment of FIG. 8 is an experimental condition for measuring the reference quality factor and is not used in an actual wireless charging system. For example, in an actual wireless charging system, an interface surface may be disposed between the primary coil unit 811 and the secondary coil unit 821. [ Here, the interface surface may be configured on one side of the wireless power transmitter as a charging bed configured to allow the wireless power receiver to be placed in the charging area.

9 is a view for explaining a lamination structure of a transceiver for quality factor measurement in a wireless charging system according to another embodiment of the present invention.

9, the wireless power transmitter 910 includes a primary coil unit 911, a first shielding unit 912, and a first metal sheet 913, and the wireless power receiver 920 includes a secondary coil A unit 921 and a second shielding unit 922, a battery 923 and a second metal sheet 924. [

Although a coiled Litz Wire constituting the primary coil unit 911 and the secondary coil unit 921 according to the embodiment may be used, this is only one embodiment, A printed pattern coil or an etching coil etched with a copper plate may be used.

Here, the second shielding unit 922 may be disposed on the surface of the battery 923 opposite to the secondary coil unit 921. For example, as the material of the second shielding unit 922, a ferrite material, an amorphous material, a nano crystal material, a sandstrut material, or the like can be used.

Preferably, the second shielding unit 922 can be used after the nano crystal alloy is formed in a ribbon shape, a sheet shape, a core shape, or the like.

For example, nano-crystal) alloys have high magnetic permeability, high saturation magnetic flux density, and low coercive force. For example, the nanocrystalline core can be made by winding a thin ribbon into a cylindrical core, then heat treating the core, and fabricating the nanocrystalline core to have a minimum ring eddy current loss characteristic.

In addition, the nanocrystalline alloy has advantages of low power loss, high temperature stability, abrasion resistance and corrosion resistance.

The nano-crystal alloy may be an Fe-based or a crystal alloy composed of a small amount of Cu, Mo, Nb, Ni and Co mixed with Fe, Si and B. Nanocrystalline alloys are superior to the Co-based amorphous alloys of the same performance in terms of magnetic properties and high price competitiveness.

The wireless power receiver 920 according to the present invention has a structure in which the second shielding unit 922 is disposed on one side of the battery 923 and the second metal sheet 924 is disposed on the other side of the battery 923, Lt; / RTI >

Further, the wireless power transmitter 910 according to the present invention further includes the first metal sheet 913 in addition to the first shielding unit 912 as well as the embodiments of Figs. 6 to 8 described above, Can have a high quality factor value.

For example, pure aluminum or aluminum alloy may be used for the second metal sheet 924, and the thickness of the second metal sheet 824 may be about 0.5 mm.

9, the quality factor value can be measured after the primary coil unit 911 and the secondary coil unit 921 are arranged to be spaced apart from each other by a predetermined distance dz. For this purpose, an acrylic plate 930 having a thickness dz may be disposed between the primary coil unit 911 and the secondary coil unit 921. Here, dz can be determined differently according to a standard standard applied to the system. In one example, dz can be 2.9 mm.

It should be noted that the acrylic plate 930 according to the embodiment of FIG. 9 is an experimental condition for measuring the reference quality factor and is not used in an actual wireless charging system. In an actual wireless charging system, for example, an interface surface may be disposed between the primary coil unit 911 and the secondary coil unit 921. [ Here, the interface surface may be configured on one side of the wireless power transmitter as a charging bed configured to allow the wireless power receiver to be placed in the charging area.

9, the wireless power receiver 920 includes a secondary coil unit 921, a second shielding unit 922 and a battery 923, and the wireless power transmitter 910 includes a primary coil 921, A unit 911, a first shielding unit 912, and a first metal sheet 913. [ 9, the wireless power receiver 920 may not include the second metal sheet 924. In this embodiment,

FIG. 10A is a view illustrating a stacked structure of a transceiver for quality factor measurement in a wireless charging system according to another embodiment of the present invention. FIG.

The wireless charging system 1000 according to FIG. 10A may be configured to include a wireless power transmitter 1010 and a wireless power receiver 1020.

10A, a wireless power transmitter 1010 includes a primary coil unit 1011, a first transmission shield unit 1012, a second transmission shield unit 1013, and a first metal sheet 1014, The wireless power receiver 1020 may be configured to include a secondary coil unit 1021 and a receive shield unit 1022, a battery 1023, and a second metal sheet 1024.

Although a coiled Litz Wire constituting the primary coil unit 1011 and the secondary coil unit 1021 according to the embodiment may be used, A printed pattern coil or an etching coil etched with a copper plate may be used.

Here, the second shielding unit 1022 may be disposed on the opposite side of the secondary coil unit 1021 of the battery 1023. As the material of the second shielding unit 1022, for example, a ferrite material, an amorphous material, a nano crystal material, a sandstrut material, or the like may be used.

Preferably, the material of the second shielding unit 1022 may be a nano crystal alloy material.

The wireless power receiver 1020 according to the present invention may be configured such that the second shielding unit 1022 is disposed on one side of the battery 1023 opposite to the secondary coil unit 1021 and the second shielding unit 1022 is disposed on the other side of the battery 1023. [ Gt; 1024 < / RTI >

The wireless power transmitter 1010 according to the present invention may be configured such that the first transmission shielding unit 1012 and the second transmission shielding unit 1013 are disposed between the primary coil unit 1011 and the first metal sheet 1014, Structure.

For example, the material of the first transmission shield unit 1012 may be a nano-crystal alloy, and the material of the second transmission shield unit 1012 may be ferrite.

Here, the first transmission shielding unit 1012 may be composed of a single sheet of nano-crystal alloy material. At this time, the thickness of the nano-crystal sheet may be 0.2 mm or more.

The second transmission shielding unit 1013 may be composed of a single ferrite sheet having a thickness of 1 mm or more and 1.6 mm or less.

For example, the first metal sheet 1014 and the second metal sheet 1024 may be made of pure aluminum or aluminum alloy, and the thickness of the first metal sheet 1014 and the second metal sheet 1024 may be 0.5 mm Or more.

As shown in FIG. 10A, the quality factor value may be measured after the primary coil unit 1011 and the secondary coil unit 1021 are arranged to be spaced apart by a predetermined distance dz. To this end, an acrylic plate 1030 having a thickness dz may be disposed between the primary coil unit 1011 and the secondary coil unit 1021. Here, dz can be determined differently according to a standard standard applied to the system. In one example, dz can be 2.9 mm.

10B is a view for explaining a lamination structure of a transceiver for quality factor measurement in a wireless charging system according to another embodiment of the present invention.

The wireless charging system 1100 according to FIG. 10B may comprise a wireless power transmitter 1110 and a wireless power receiver 1120.

10B, a wireless power transmitter 1110 includes a primary coil unit 1111, a first transmit shield unit 1112, a second transmit shield unit 1113, and a metal sheet 1114, The receiver 1120 may be configured to include a secondary coil unit 1121, a receiving shield unit 1122, and a battery 1123. That is, the second metal sheet 1024 may be configured to be removed as compared to the wireless power receiver 1020 according to FIG. 10A.

The primary coil unit 1111 according to one embodiment may be a composite type antenna, and the secondary coil unit 1121 may be a single type multi-coil antenna. Here, the coil used for the primary coil unit 1111 and the secondary coil unit 1121 may be a Litz wire, but this is merely an example, and the pattern printed on the printed circuit board An etching coil or the like in which a coil or a copper plate is etched may be used.

The composite type antenna according to the embodiment may include a coil-type wireless recharging antenna and an NFC antenna.

The composite type antenna according to another embodiment may be configured to include a wireless charging antenna in the form of a coil, an NFC antenna, and a security payment antenna for wireless settlement.

The second shielding unit 1122 may be disposed on the opposite side of the secondary coil unit 1121 of the battery 1123. For example, as the material of the second shielding unit 1122, a ferrite material, an amorphous material, a nano crystal material, a sandstrut material, or the like can be used.

Preferably, the material of the second shielding unit 1122 may be a nano crystal alloy material. For example, the second shielding unit 1122 may be a Nano Crystal alloy sheet having a thickness of 0.1 mm or more.

A wireless power transmitter 1110 according to the present invention includes a first shielding unit 1112 and a second transmission shielding unit 1113 disposed between a primary coil unit 1111 and a first metal sheet 1114, Structure.

For example, the first transmission shield unit 1112 may be made of a nano-crystal alloy material, and the second transmission shield unit 1012 may be made of a ferrite material. In particular, the first transmission shielding unit 1112 according to this embodiment can be composed of two sheets of nano-crystal sheets.

Here, each nanocrystal sheet may have a thickness of about 0.1 mm.

Further, the second transmission shielding unit 1012 may be composed of a ferrite sheet having a thickness of 1.0 mm or more.

In one example, the metal sheet 1114 may be composed of pure aluminum or an aluminum alloy. In one example, the thickness of the metal sheet 1114 may be 0.5 mm or more.

As shown in FIG. 10B, the quality factor value can be measured after the primary coil unit 1111 and the secondary coil unit 1121 are arranged to be spaced apart by a predetermined distance dz. For this purpose, an acrylic plate 1130 having a thickness dz may be disposed between the primary coil unit 1111 and the secondary coil unit 1121.

Here, dz can be determined differently according to a standard standard applied to the system. In one example, dz can be 2.9 mm.

11 is a table of experimental results showing changes in quality factor values according to various configurations of a transceiver according to an embodiment of the present invention.

Referring to reference numeral 1101, a wireless power receiver according to arrangement type 1 1103 and arrangement type 2 1104 includes a battery and a secondary coil unit, and the wireless power transmitter includes a primary coil unit and a first shielding unit And the like.

At this time, the material of the first shielding unit of the arrangement type 1 (1103) is ferrite and the material of the first shielding unit of the arrangement type 2 (1104) is amorphous.

In this experiment, a coil composed of a Litz wire was used for the primary coil unit and the secondary coil unit. In particular, the primary coil unit has a multi-coil structure including three transmission coils.

As shown in the drawing 1101, the quality factor values of the batch type 1 1103 and the batch type 2 1104 measured without the receiver placed on the interface surface are 100 and 81.72, respectively.

The quality factor values of the placement type 1 1103 and the placement type 2 1104 measured while the receiver is disposed on the interface surface are determined based on the measured quality factor values Which is 33.45 and 30.42, respectively.

That is, it can be seen that the wireless power transmitter has a high quality factor value when the first shielding unit made of ferrite material is disposed rather than the amorphous material.

Referring to reference numeral 1102, a wireless power receiver according to arrangement type 3 1105 and arrangement type 4 1106 includes a second metal sheet, a battery, a second shielding unit and a secondary coil unit, A primary coil unit, a first shielding unit, and a second metal sheet.

At this time, the material of the second shielding unit of the arrangement type 3 1105 is amorphous, and the material of the second shielding unit of the arrangement type 4 1106 is nano-crystal.

All of the first shielding units used in the arrangement type 3 1105 and the arrangement type 4 1106 are made of a ferrite material.

As shown in the drawing 1102, the quality factor values of the placement type 3 1105 and the placement type 4 1106 measured when the receiver is not disposed on the interface surface are 104 and 105.17, respectively.

The quality factor values of the placement type 3 1105 and the placement type 4 1106 measured with the receiver placed on the interface surface are as shown in Fig. 15 and the description thereof, Respectively, which are 48.13 and 52.96, respectively.

That is, it can be seen that the radio power receiver has a high quality factor value when the second shielding unit made of nano-crystal material is disposed rather than the amorphous material.

Also, when the reference numerals 1101 and 1102 are compared, it can be seen that when the second shielding unit is additionally disposed in at least the wireless power receiver, the quality factor value increases.

In addition, when the reference numerals 1101 and 1102 are compared, if the first metal sheet and the second metal sheet are additionally disposed in each of the wireless power transmitter and the wireless power receiver, and the second shielding unit is further disposed in the wireless power receiver, It can be seen that the quality factor value can be obtained.

12 is an experimental result table showing changes in quality factor values according to various arrangements of a transceiver according to another embodiment of the present invention.

Referring to reference numeral 1201, a wireless power receiver according to arrangement type 5 (1210) is a no-load receiver that does not include a battery, and a wireless power receiver according to arrangement type 6 (1220) may be a receiver including a battery.

The wireless power transmitter may comprise a primary coil unit and a first shielding unit. Here, the material of the first shielding unit corresponding to the arrangement type 5 1210 and the arrangement type 6 1220 may all be ferrite.

In this experiment, the primary coil unit and secondary coil unit consist of Litz Wire. In particular, the primary coil unit has a multi-coil structure including three transmission coils.

As shown in the drawing 1201, the quality factor values of the placement type 5 1210 and placement type 6 1220 measured without the receiver placed on the interface surface are 113.97 and 80.00, respectively. That is, it can be seen that a high quality factor value is measured in a no-load state.

The quality factor values of the arrangement type 5 1210 and the placement type 6 1220 measured with the receiver placed on the interface surface are as shown in FIG. 15 and the description thereof, Which is 72.53 and 34.12, respectively.

That is, it can be seen that a high quality factor value is measured when a no-load receiver is placed than when a receiver including a battery is placed.

Reference numeral 1202 denotes a quality factor value measured according to the material of the first shielding unit of the wireless power transmitter with the wireless power receiver composed of the battery and the secondary coil unit disposed on the acrylic plate.

As shown in the drawing 1202, the materials of the first shielding unit corresponding to the arrangement type 6 (1220), arrangement type 7 (1230) and arrangement type 8 (1240) are respectively ferrite, amorphous and nano-crystal.

According to the results of FIG. 12, it can be seen that the highest quality factor is measured when the first shielding unit is composed of ferrite material among the three materials.

13 is an experimental result table showing changes in quality factor values according to various arrangements of a transceiver according to another embodiment of the present invention.

13 is an experimental result table showing a change in the quality factor value according to the capacity of the battery mounted in the wireless power receiver.

In this experiment, the primary coil unit and secondary coil unit consist of Litz Wire. In particular, the primary coil unit has a multi-coil structure including three transmission coils, and a secondary coil unit including only a wireless charging antenna is used.

13, the battery capacities corresponding to the arrangement type 9 (1310), the arrangement type 10 (1320) and the arrangement type 11 (1330) are respectively 1800 mA / 2600 mA / 3000 mA.

Referring to reference numeral 1301, the quality factor values measured corresponding to the arrangement type 9 (1310), the arrangement type 10 (1320) and the arrangement type 11 (1330) in a state in which the receiver is disposed are 55.03 / 53.5 / 53.3 Show.

That is, it can be seen that the lower the capacity of the battery mounted in the wireless power receiver, the higher the quality factor value is measured.

According to an embodiment of the present invention, the material, thickness (or number of sheets), and the like of the second shielding unit may be determined according to the capacity of the battery mounted in the wireless power receiver.

In one example, the material, thickness, etc. of the second shielding unit can be determined so that the quality factor value measured in the state in which the receiver is placed exceeds at least 50.

In another embodiment of the present invention, the material, the thickness (or the number of sheets) of the first shielding unit and the like may be determined according to the capacity of the battery mounted in the wireless power receiver.

For example, if the battery capacity is 1800 mA, amorphous is used as the material of the first shielding unit, and if the battery capacity is 3000 mA, ferrite may be applied as the material of the first shielding unit.

Yet another embodiment of the present invention is that the wireless power transmitter may be configured to include an additional shielding unit between the primary coil unit and the first shielding unit, depending on the capacity of the battery mounted in the wireless power receiver.

For convenience of explanation, the first shielding unit will be referred to as a first transmission shielding unit, and the shielding unit added between the car coil unit and the first shielding unit will be referred to as a second transmission shielding unit.

For example, if the battery capacity meets a predetermined first reference range, one sheet of nanocrystalline alloy sheet having a first thickness may be additionally disposed between the primary coil unit and the first shielding unit.

In another example, if the battery capacity satisfies a predetermined second reference range, two sheets of nanocrystalline alloy sheets having a first thickness may be additionally disposed between the primary coil unit and the first shielding unit.

Yet another embodiment of the present invention is that when the secondary coil unit disposed in the wireless power receiver is a hybrid type antenna comprising a wireless charging antenna and a short-range wireless communication antenna, the wireless power transmitter comprises a first transmission shield unit and a second transmission And a shielding unit.

Here, the first transmission shielding unit may be made of a ferrite material, and the second transmission shielding unit may be composed of at least two sheets of nano-crystal sheets having a predetermined thickness, for example, 0.1 mm. Of course, in this case, the second shielding unit may be made of a nano-crystal material.

14A is an experimental result table showing changes in quality factor values according to various arrangements of a transceiver according to another embodiment of the present invention.

In detail, FIG. 14A is an experimental result table showing a change in quality factor value according to the antenna configuration of the secondary coil unit disposed in the wireless power receiver.

14A, a wireless power receiver according to arrangement type 12 (1410) is composed of a secondary coil unit including only a wireless charging antenna, and a wireless power receiver according to arrangement type 13 (1420) And a communication antenna, for example, an NFC antenna. Note that, except for the structure of the secondary coil unit, the arrangement of the remaining transceivers of the arrangement type 12 (1410) and the arrangement type 13 (1420) is the same.

Referring to reference numeral 1410, it can be seen that the quality factor value measured corresponding to batch type 12 (1410) is greater than the quality factor value measured corresponding to batch type 13 (1420).

Based on the experimental result of FIG. 14A, the embodiment of the present invention can determine the material and thickness of at least one of the first shielding unit and the second shielding unit based on the antenna configuration of the secondary coil unit.

According to another embodiment of the present invention, an additional shielding unit may be disposed between the primary coil unit and the first shielding unit according to the antenna configuration of the secondary coil unit. At this time, the material and / or the thickness (or the number of sheets) of the additional shielding unit may be determined based on at least one of the battery capacity and the antenna configuration of the secondary coil unit.

FIG. 14B is an experimental result table showing changes in quality factor values according to various arrangements of a transceiver according to another embodiment of the present invention. FIG.

In detail, FIG. 14B shows an experimental result showing the change in the quality factor value according to the thickness of the first transmission shielding unit disposed in the wireless power transmitter when the secondary coil unit of the wireless power receiver is a hybrid type and the battery capacity is 3000 mA Table.

14B, a wireless power receiver according to arrangement type 14 (1430) and arrangement type 15 (1430) comprises a composite type secondary coil unit, a nano-crystal receiving shield unit and a 3000 mA battery.

The wireless power transmitter according to arrangement type 14 (1430) and arrangement type 15 (1430) comprises a three-coil primary coil unit consisting of Litz wire, a first transmission shielding unit made of nanocrystals, a second transmission shielding unit made of ferrite, And a metal sheet. Here, the ferrite thickness of the second transmission shield unit is 1.6 mm, and the thickness of the metal sheet is 0.5 mm.

Particularly, in this experiment, the nano-crystal sheets constituting the first transmission shielding unit of the arrangement type 14 (1430) and the arrangement type 15 (1430) are different from each other as 0, 1, Thickness.

Referring to reference numeral 1442, quality factor values corresponding to placement type 14 (1430) and placement type 15 (1440) when the receiver is placed are measured as 47.21 and 49.58, respectively.

According to the experimental results shown in FIG. 14B, if a quality factor value of at least 50 is measured in a state where a wireless power receiver corresponding to the placement type 14 (1430) and the placement type 15 (1440) It may be desirable that a nanocrystal sheet of at least about 0.2 mm is disposed between the primary coil unit and the second transmission shielding unit.

The hybrid type secondary coil unit is composed of a secondary coil unit including only a wireless charging antenna, and the wireless power receiver according to the arrangement type 13 (1420) is composed of a wireless charging antenna and a short range communication antenna - for example, Of the secondary coil unit. Note that, except for the structure of the secondary coil unit, the arrangement of the remaining transceivers of the arrangement type 12 (1410) and the arrangement type 13 (1420) is the same.

Referring to reference numeral 1410, it can be seen that the quality factor value measured corresponding to batch type 12 (1410) is greater than the quality factor value measured corresponding to batch type 13 (1420).

Based on the experimental results of Fig. 14, the embodiment of the present invention can determine the material and thickness of at least one of the first shielding unit and the second shielding unit based on the antenna configuration of the secondary coil unit.

According to another embodiment of the present invention, an additional shielding unit may be disposed between the primary coil unit and the first shielding unit according to the antenna configuration of the secondary coil unit. At this time, the material and / or the thickness (or the number of sheets) of the additional shielding unit may be determined based on at least one of the battery capacity and the antenna configuration of the secondary coil unit.

FIG. 14C is an experimental result table showing changes in quality factor values according to various configurations of a transceiver according to another embodiment of the present invention. FIG.

In detail, FIG. 14C shows experimental results showing the change in the quality factor value according to the thickness of the first transmission shielding unit disposed in the wireless power transmitter when the secondary coil unit of the wireless power receiver is a hybrid type and the battery capacity is 2600 mA Table.

Referring to FIG. 14C, a wireless power receiver according to arrangement type 15 (1450) and arrangement type 16 (1460) comprises a composite type secondary coil unit, a nano-crystal receive shield unit and a 2600 mA battery.

The wireless power transmitter according to arrangement type 16 (1450) and arrangement type 17 (1460) comprises a three-coil primary coil unit consisting of Litz wire, a first transmission shielding unit made of nano crystal, a second transmission shielding unit made of ferrite, And a metal sheet. Here, the ferrite thickness of the second transmission shield unit is 1.6 mm, and the thickness of the metal sheet is 0.5 mm.

Particularly, in this experiment, the nano-crystal sheets constituting the first transmission shielding unit of the arrangement type 16 (1450) and the arrangement type 17 (1460) are different from each other as 0,1, Thickness.

Referring to reference numeral 1462, quality factor values corresponding to placement type 16 (1450) and placement type 17 (1460) when the receiver is deployed are measured to be 46.61 and 50.03, respectively.

According to the experimental results shown in FIG. 14C, if a quality factor value of at least 50 is measured in a state where a wireless power receiver corresponding to the arrangement type 16 (1450) and the arrangement type 17 (1460) It may be desirable that a nanocrystal sheet of at least about 0.2 mm or more is disposed between the primary coil unit and the second transmission shielding unit.

The hybrid type secondary coil unit is composed of a secondary coil unit including only a wireless charging antenna, and the wireless power receiver according to the arrangement type 13 (1420) is composed of a wireless charging antenna and a short range communication antenna - for example, Of the secondary coil unit. Note that, except for the structure of the secondary coil unit, the arrangement of the remaining transceivers of the arrangement type 12 (1410) and the arrangement type 13 (1420) is the same.

Referring to reference numeral 1410, it can be seen that the quality factor value measured corresponding to batch type 12 (1410) is greater than the quality factor value measured corresponding to batch type 13 (1420).

Based on the experimental results of Fig. 14, the embodiment of the present invention can determine the material and thickness of at least one of the first shielding unit and the second shielding unit based on the antenna configuration of the secondary coil unit.

According to another embodiment of the present invention, an additional shielding unit may be disposed between the primary coil unit and the first shielding unit according to the antenna configuration of the secondary coil unit. At this time, the material and / or the thickness (or the number of sheets) of the additional shielding unit may be determined based on at least one of the battery capacity and the antenna configuration of the secondary coil unit.

15 is a diagram for explaining a method of measuring a quality factor value by a wireless power transmitter for authentication according to an embodiment of the present invention.

15, the wireless power transmitter for authentication - which may be, for example, MP1 - may include a fifth point 1515, which is the center of the interface surface 520, The quality factor can be measured using the LCR METER with the wireless power receiver positioned at the point where the TOP / BOTTOM / LEFT / RIGHT are moved 5mm each.

The LCR meter is an electronic measuring instrument for measuring the inductance (L), capacitance (C) and resistance (R) of an electronic component.

Specifically, the wireless power transmitter for authentication includes a first point 1511 that is moved 5 mm to the right from the center of the interface surface 1520, a second point 1512 that is 5 mm to the left of the center 15 mm, The wireless power receiver 1530 is placed in each of the third point 1513 which is moved, the fourth point 1515 which is moved 5 mm downward from the center and the fifth point 1515 which is the center of the interface surface 1520 At this time, the quality factor value for the reference operating frequency can be measured in the case where the foreign matter is not arranged.

Here, the reference operating frequency used for measuring the quality factor value is 100 KHz, and a small voltage may be applied to the transmitting coil.

For example, the voltage applied to the transmitting coil may be 0.85 +/- 0.25 V rms (root mean square), but is not limited thereto. The voltage applied to the transmitting coil may be any value between 0.5 V and 1, 2 V .

The reference operating frequency used to determine the reference quality factor value using the wireless power transmitter for authentication and the LCR meter is the operating frequency used to measure the quality factor value in commercial wireless power transmitters - Can be different.

The wireless power transmitter may correct the quality factor threshold value in consideration of the frequency difference between the reference operating frequency and the measured operating frequency.

In addition, the quality factor threshold value may be corrected in consideration of the design difference between the wireless power transmitter for authentication and the commercial wireless power transmitter.

The smallest one of the quality factor values measured at each of the first to fifth points 1511 to 1515 may be determined as a reference quality factor value corresponding to the corresponding wireless power receiver.

The wireless power receiver may maintain its reference quality factor value in the internal memory and may transmit the FOD status packet including the reference quality factor value to the wireless power transmitter in the negotiation step 540 of FIG.

A method of detecting a foreign matter before entering the power transmission step is advantageous in that not much energy is absorbed in foreign matter in the detection step and foreign matter can be detected with high accuracy regardless of the power level required by the wireless power receiver have.

However, in the case of a wireless power receiver having a low reference quality factor value, there is a problem that the quality factor drop ratio due to the arrangement of the foreign matter is low, so that the foreign matter detection performance deteriorates.

Therefore, it is very important to configure the wireless power receiver to have a reference quality factor value equal to or higher than a certain level in order for the FOD method before power transfer to operate normally.

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

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

Claims (6)

A primary coil unit for transmitting a wireless power signal; And
A shielding unit comprising a first shielding unit made of a ferrite material and a second shielding unit disposed between the first shielding unit and the primary coil unit and made of nano-
/ RTI >
Wherein the thickness of the second shielding unit is at least 0.2 mm, and the thickness of the first shielding unit is at least 1.0 mm. The method according to claim 1,
Wherein the second shielding unit is an alloy sheet of a plurality of the nanocrystals. The method according to claim 1,
Further comprising a charging bed in which a wireless power receiver is disposed,
Wherein the material and thickness of the first shielding unit and the second shielding unit are determined based on at least one of a capacity of a battery of the wireless power receiver and an antenna configuration of a secondary coil unit disposed in the wireless power receiver, . The method of claim 3,
Wherein the antenna configuration comprises a single type configuration comprising only a wireless charging antenna and a hybrid type configuration comprising the wireless charging antenna and the short range wireless communication antenna. The method according to claim 1,
And a metal sheet disposed on the opposite side of the second shielding unit with respect to the first shielding unit. 6. The method of claim 5,
Wherein the metal sheet is an aluminum material.

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