KR102121987B1 - WIRELESS POWER TRANSMITTING APPARATUS, WIRELESS CHARGING SYSTEM and CONTROL METHOD THEREOF - Google Patents

Abstract

A wireless power transmission apparatus according to an embodiment of the present invention, when an external material enters a coil part formed to transmit wireless power and a space where a flux linkage is formed by the coil part, a signal sensed from the coil part When the is out of the predetermined inductance or impedance range, it includes a control unit formed to adjust the current supplied to the coil unit.

Description

Wireless Power Transceiver, Wireless Charging System and Control Method of Wireless Charging System {WIRELESS POWER TRANSMITTING APPARATUS, WIRELESS CHARGING SYSTEM and CONTROL METHOD THEREOF}

Embodiments of the present invention relate to wireless power transmission. More specifically, it relates to the operation of the wireless charging system when foreign substances are introduced into the space where the flux linkage is formed.

Instead of traditionally supplying electrical energy by wire to wireless power receivers, a method of supplying electrical energy wirelessly without contact has been recently used. A wireless power receiver that wirelessly receives energy may be driven directly by the received wireless power, or may be driven by charging the battery and charging the battery using the received wireless power.

The Wireless Power Consortium, which deals with technology for magnetically induced wireless power transmission, described the wireless power transmission system manual, Volume 1, on April 12, 2010, regarding interoperability in wireless power transmission. The standard document "Low Power, Part 1: Interface Definition, Version 1.00 RC1 (System Description Wireless Power Transfer, Volume 1, Low Power, Part 1: Interface Definition, Version 1.00 Release Candidate 1)" has been released. The standard document of the wireless power council describes a method of transmitting power from one wireless power transmitter to one wireless power receiver by a magnetic induction method.

One object of the present invention is to provide a wireless charging system capable of maintaining efficiency and performance when foreign substances are introduced into a space where a flux linkage is formed.

In order to achieve the above-described problems of the present invention, a wireless power transmission apparatus according to an embodiment of the present invention includes a coil part formed to transmit wireless power, and an external space within a space where a flux linkage is formed by the coil part. When the material enters, the control unit is configured to adjust the current supplied to the coil unit when the signal sensed from the coil unit is outside a predetermined inductance or impedance range.

According to an example related to the present invention, the wireless power transmission device may further include a detection unit formed to sense a change in inductance or impedance of the transmission coil provided in the coil unit.

According to an example related to the present invention, the control unit, in a state of charging preparation before the wireless power is transmitted, cuts off the current supplied to the transmission coil, and can measure the inductance or impedance of the transmission coil through the detection unit. have.

According to an example related to the present invention, the control unit may supply a small amount of current to the transmission coil in a state of preparation for charging before wireless power is transmitted, and measure inductance or impedance of the transmission coil through the sensing unit. have.

According to an example related to the present invention, the control unit measures the inductance or impedance of the transmission coil through the sensing unit while blocking the current supplied to the transmission coil at a predetermined period in a charging state in which wireless power is transmitted. Can.

According to an example related to the present invention, the control unit may measure inductance or impedance of the transmission coil through the sensing unit while supplying a small amount of current to the transmission coil at a predetermined cycle in a charging state in which wireless power is transmitted. have.

According to an example related to the present invention, the wireless power transmission device further includes an alarm unit for outputting a signal for notifying the occurrence of an event, and the control unit is preset through the alarm unit before adjusting the current supplied to the coil unit. You can output a signal.

In addition, another embodiment of the present invention, to realize the above problems, is provided with a first coil portion, a transmission device formed to transmit wireless power, and a second coil portion, the wireless power from the transmission device When a foreign material enters a space formed by a receiving device formed to receive and the transmitting device or the receiving device, and where a flux linkage is formed by the coil parts, a signal sensed from any one of the coil parts is preset. Disclosed is a wireless charging system including a control unit configured to adjust a current supplied to the first coil unit when it is outside an inductance or impedance range.

According to an example related to the present invention, the transmitting device or the receiving device may further include a sensing unit configured to sense a change in inductance or impedance of the coil.

According to an example related to the present invention, the control unit blocks the current supplied to the transmission coil of the first coil unit in a state of preparation for charging before the wireless power is transmitted, and inductance of the transmission coil through the sensing unit Impedance can be measured.

According to an example related to the present invention, the control unit supplies a small amount of current to the transmission coil of the first coil unit in a state of preparation for charging before the wireless power is transmitted, and inductance of the transmission coil through the sensing unit Impedance can be measured.

According to an example related to the present invention, in the charging state in which wireless power is transmitted, while blocking the current supplied to the transmission coil of the first coil unit at a predetermined period, the inductance of the transmission coil through the detection unit B Impedance can be measured.

According to an example related to the present invention, the control unit may measure inductance or impedance of the transmission coil through the sensing unit while supplying a small amount of current to the transmission coil at a predetermined cycle in a charging state in which wireless power is transmitted. have.

In addition, another embodiment of the present invention in order to realize the above object, the standby step of receiving a signal to switch from the charging ready state to the charging state, and when receiving the switching signal, cut off the current supplied to the transmission coil or Measuring step of measuring the inductance or impedance of the transmitting coil or the receiving coil through the sensing unit while supplying a small amount of current to the transmitting coil and comparing whether the measured inductance or impedance value is within a predetermined range, and comparing the predetermined range Wireless control including a step of switching to a charging state for supplying current to the transmission coil so as to cut off the current supplied to the transmission coil and waits in a ready state for charging if not out of the predetermined range, wireless power is transmitted. Disclosed is a control method of a charging system.

According to an example related to the present invention, the control step may further include an output step of outputting a signal for notifying the occurrence of an event to the alarm unit when the measured value of the inductance or impedance is outside a preset range.

In addition, another embodiment of the present invention, in order to realize the above problems, while blocking the current supplied to the transmitting coil at a predetermined period in the charging state or supplying a small amount of current to the transmitting coil, the transmitting coil or the receiving coil through the sensing unit The measurement step of measuring the inductance or impedance of the and compares whether the measured value of the inductance or impedance is within a preset range, and if it is out of the preset range, cuts off the current supplied to the transmission coil and waits for charging. In addition, a control step of maintaining a state of charge for supplying current to the transmission coil may be performed so that wireless power is transmitted unless it is within a predetermined range.

According to an example related to the present invention, the control step may further include an output step of outputting a signal for notifying the occurrence of an event to the alarm unit when the value of the measured inductance or impedance is outside a preset range.

The control method of the wireless power transmission/reception device, the wireless charging system, and the wireless charging system according to at least one embodiment of the present invention configured as described above, when a signal sensed from the coil part is out of a predetermined inductance or impedance range, the coil part By adjusting the supplied current, even if the external material is disposed in a space where the flux linkage is formed, it is possible to prevent the efficiency and performance of the wireless charging system from deteriorating or the foreign material being heated by the flux linkage.

1 is an exemplary diagram conceptually illustrating a wireless power transmission device and an electronic device according to embodiments of the present invention.
2A and 2B are block diagrams exemplarily illustrating configurations of the wireless power transmitter 100 and the electronic device 200 employable in the embodiments disclosed herein.
3 illustrates a concept in which power is wirelessly transmitted from a wireless power transmitter to an electronic device according to an inductive coupling method.
FIG. 4 is a block diagram showing a part of the configuration of the electromagnetic induction type wireless power transmitter 100 and the electronic device 200 employable in the embodiments disclosed herein.
5 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils to receive power according to the inductive coupling method employable in the embodiments disclosed herein.
6 is a conceptual diagram illustrating a concept in which power is wirelessly transmitted from a wireless power transmitter to an electronic device according to a resonance coupling method.
7 is a block diagram illustrating a part of the configuration of the wireless power transmitter 100 and the electronic device 200 of a resonance method employable in the embodiments disclosed herein.
8 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils that receive power according to a resonant coupling scheme employable in embodiments disclosed herein.
9 is a block diagram showing a wireless power transmission apparatus further including an additional configuration in addition to the configuration shown in (a) of FIG. 2.
10 is a diagram illustrating a configuration when the electronic device 200 according to the embodiments disclosed herein is implemented in the form of a mobile terminal.
11 is a front perspective view of a charger related to an embodiment of the present invention.
12 is a front perspective view of a mobile terminal related to an embodiment of the present invention.
13 is a rear perspective view of the mobile terminal shown in FIG. 12;
14A is a conceptual diagram of a wireless charging system related to an embodiment of the present invention, and FIG. 14B is a diagram illustrating an example in which foreign substances are introduced into a space in which a flux linkage is formed.
15 is a block diagram of a wireless charging system related to an embodiment of the present invention.
FIG. 16 shows a change in inductance according to the magnitude of the current supplied to the load and the alignment between the wireless power transmitter and the wireless power receiver, respectively, in the case where there is no foreign material in the space where the flux linkage is formed and when there is an external material. One drawing.
FIG. 17 shows the change in impedance according to the magnitude of the current supplied to the load and the alignment between the wireless power transmitter and the wireless power receiver in the case where there is no foreign material and when there is no foreign material in the space where the flux linkage is formed. One drawing.
FIG. 18 is a view showing a change in inductance according to the magnitude of current supplied to a load and an alignment state between the wireless power transmitter and the wireless power receiver.
19 is a flowchart illustrating an example of a control method of a wireless charging system in a state of being ready for charging.
20 is a flowchart illustrating an example of a control method of a wireless charging system in a charging state.

The technology disclosed herein applies to contactless power transfer. However, the technology disclosed herein is not limited to this, and may be applied to all power transmission systems and methods, wireless charging circuits and methods, and other methods and devices using power transmitted wirelessly to which the technical spirit of the technology may be applied. .

It should be noted that the technical terms used in this specification are only used to describe specific embodiments, and are not intended to limit the spirit of the technology disclosed herein. In addition, technical terms used in this specification should be interpreted as meanings generally understood by a person having ordinary knowledge in the field to which the technology disclosed in this specification belongs, unless defined otherwise. It should not be interpreted as a comprehensive meaning or an excessively reduced meaning. In addition, when the technical term used in this specification is a wrong technical term that does not accurately represent the spirit of the technology disclosed in this specification, it should be understood as being replaced by a technical term that can be correctly understood by those skilled in the art. In addition, the general terms used in this specification should be interpreted as defined in the dictionary or in context before and after, and should not be interpreted as an excessively reduced meaning.

In addition, a singular expression used in this specification includes a plural expression unless the context clearly indicates otherwise. In this specification, the terms "consisting of" or "comprising" should not be construed as including all of the various components, or various steps described in the specification, among which some components or some steps It may not be included, or it should be construed to further include additional components or steps.

In addition, the suffixes "module" and "part" for the components used in the present specification are given or mixed only by considering the ease of writing the specification, and do not have a meaning or a role distinguished from each other in itself.

Further, terms including ordinal numbers such as first and second used in the present specification may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component.

Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings, but the same or similar elements are assigned the same reference numbers regardless of the reference numerals, and overlapping descriptions thereof will be omitted.

In addition, in the description of the technology disclosed in the present specification, when it is determined that the detailed description of the related known technology may obscure the gist of the technology disclosed herein, the detailed description will be omitted. In addition, it should be noted that the accompanying drawings are only for easily understanding the spirit of the technology disclosed in the present specification, and should not be interpreted as limiting the spirit of the technology by the accompanying drawings.

1-Concept diagram of a wireless power transmission device and an electronic device

1 is an exemplary diagram conceptually illustrating a wireless power transmission apparatus and an electronic device according to embodiments disclosed herein.

As can be seen with reference to FIG. 1, the wireless power transmitter 100 may be a power transmission device that wirelessly delivers power required to the electronic device 200 (or wireless power receiver).

Also, the wireless power transmitter 100 may be a wireless charging device that charges the battery of the electronic device 200 by wirelessly transmitting power. An embodiment implemented with the wireless power transmitter 100 will be described later with reference to FIG. 9.

In addition, the wireless power transmitter 100 may be embodied as various types of devices that transmit power to the electronic device 200 in need of power while not in contact.

The electronic device 200 is a device capable of operating by receiving power wirelessly from the wireless power transmitter 100. Also, the electronic device 200 may charge the battery using the received wireless power.

On the other hand, electronic devices that receive power wirelessly as described herein include all portable electronic devices, such as input/output devices such as a keyboard, mouse, auxiliary output device for video or audio, mobile phones, cellular phones, and smart phones ( It should be interpreted as encompassing smart phones, PDAs (Personal Digital Assistants), PMPs (Portable Multimedia Players), and tablets or multimedia devices.

The electronic device 200 may be a mobile communication terminal (for example, a mobile phone, a cellular phone, or a tablet) or a multimedia device, as described later. An embodiment in which the electronic device 200 is implemented as a mobile terminal will be described later with reference to FIG. 10.

Meanwhile, the wireless power transmitter 100 may use one or more wireless power delivery methods to wirelessly transmit power to the electronic device 200 without mutual contact. That is, the wireless power transmission apparatus 100 has an inductive coupling method based on an electromagnetic induction phenomenon generated by the wireless power signal and a resonance coupling based on an electromagnetic resonance phenomenon generated by a wireless power signal of a specific frequency. (Electromagnetic Resonance Coupling) can transmit power using one or more of the methods.

Wireless power transmission by the inductive coupling method is a technique of transmitting power wirelessly using a primary coil and a secondary coil, and a current is applied to the other coil by a changing magnetic field generated by electromagnetic induction in one coil. It means that power is transmitted by being induced.

In the wireless power transmission by the resonance coupling method, electromagnetic resonance occurs in the electronic device 200 by the wireless power signal transmitted from the wireless power transmitter 100, and the wireless power is transmitted by the resonance phenomenon It means that power is transferred from the device 100 to the electronic device 200.

Hereinafter, embodiments of the wireless power transmission apparatus 100 and the electronic device 200 disclosed in this specification will be described in detail. Reference numerals added to the components of each drawing below are used for the same components as much as possible, even if indicated on different drawings.

2 is a block diagram illustrating the configuration of a wireless power transmitter 100 and an electronic device 200 employable in the embodiments disclosed herein.

2A-Wireless power transmitter

Referring to Figure 2A, the wireless power transmission device 100 is configured to include a power transmission unit (Power Transmission Unit) (110). The power transmission unit 110 may include a power conversion unit 111 and a power transmission control unit 112.

The power conversion unit 111 converts the power supplied from the transmission-side power supply unit 190 into a wireless power signal and transmits it to the electronic device 200. The wireless power signal transmitted by the power converter 111 is formed in the form of a magnetic field or an electro-magnetic field having oscillation characteristics. To this end, the power conversion unit 111 may be configured to include a coil generating the wireless power signal.

The power converter 111 may include components for forming different types of wireless power signals according to each power transmission method.

In some embodiments, the power converter 111 may be configured to include a primary coil that forms a changing magnetic field to induce a current in the secondary coil of the electronic device 200 according to an inductive coupling method. . In addition, in some embodiments, the power converter 111 is configured to include a coil (or antenna) that forms a magnetic field having a specific resonance frequency in order to generate a resonance phenomenon in the electronic device 200 according to a resonance coupling method. Can be.

In addition, in some embodiments, the power converter 111 may transmit power using one or more of the above-described inductive coupling method and resonant coupling method.

4A, 4B and 5 for those that follow the inductive coupling method among the components included in the power conversion unit 111, and 7A, 7B and 8 for those that follow the resonance coupling method. It will be described later with reference to.

On the other hand, the power converter 111 may be configured to further include a circuit that can adjust the characteristics of the frequency, applied voltage, current, etc. used to form the wireless power signal.

The power transmission control unit 112 controls each component included in the power transmission unit 110. In some embodiments, the power transmission control unit 112 may be implemented to be integrated with another control unit (not shown) that controls the wireless power supply device 100.

Meanwhile, an area in which the wireless power signal can reach can be divided into two types. First, an active area refers to an area through which a wireless power signal that transmits power to the electronic device 200 passes. Next, a semi-active area refers to an area of interest in which the wireless power transmitter 100 can detect the presence of the electronic device 200. Here, the power transmission control unit 112 may detect whether the electronic device 200 is placed or removed in the active area or the sensing area. Specifically, the power transmission control unit 112 uses the wireless power signal formed in the power conversion unit 111, or whether the electronic device 200 is disposed in the active area or the detection area by a separately provided sensor. Whether it can be detected. For example, the power transmission control unit 112 is affected by the wireless power signal due to the electronic device 200 existing in the detection area, thereby generating power for the wireless power signal of the power conversion unit 111. The presence of the electronic device 200 may be detected by monitoring whether or not the characteristic of the device changes. However, the active area and the sensing area may be different depending on a wireless power transmission method such as an inductive coupling method and a resonance coupling method.

The power transmission control unit 112 may perform a process of identifying the electronic device 200 or determine whether to start wireless power transmission according to a result of detecting the presence of the electronic device 200.

In addition, the power transmission control unit 112 may determine one or more characteristics of the frequency, voltage, and current of the power conversion unit 111 for forming the wireless power signal. The determination of the characteristics may be made according to the conditions of the wireless power transmitter 100 side or the conditions of the electronic device 200 side. In some embodiments, the power transmission control unit 112 may determine the characteristic based on device identification information of the electronic device 200. In some embodiments, the power transmission control unit 112 may determine the characteristic based on the requested power information of the electronic device 200 or profile information about the requested power. The power transmission control unit 112 may receive a power control message from the electronic device 200. The power transmission control unit 112 may determine one or more characteristics of the frequency, voltage, and current of the power conversion unit 111 based on the received power control message, and other control based on the power control message. You can perform the operation.

For example, the power transmission control unit 112 is used to form the wireless power signal according to a power control message including one or more of rectified power amount information, charging state information, and identification information of the electronic device 200 It is possible to determine the characteristics of one or more of the frequency, current, and voltage.

In addition, as another control operation using the power control message, the wireless power transmitter 100 may perform a general control operation related to wireless power transmission based on the power control message. For example, the wireless power transmitter 100 may receive information to be output audibly or visually related to the electronic device 200 through the power control message, or may receive information necessary for authentication between devices. .

In some embodiments, the power transmission control unit 112 may receive the power control message through the wireless power signal. In some embodiments, the power transmission control unit 112 may receive the power control message through a method of receiving user data.

In order to receive the power control message, the wireless power transmitter 100 may be further configured to further include a power communication modulation/demodulation unit 113 that is electrically connected to the power conversion unit 111. . The modulation/demodulation unit 113 may be used to demodulate the wireless power signal modulated by the electronic device 200 to receive the power control message. A method for the power conversion unit 111 to receive a power control message using a wireless power signal will be described later with reference to FIGS. 11A to 13.

In addition, the power transmission control unit 112 may obtain a power control message by receiving user data including a power control message by a communication means (not shown) included in the wireless power transmission device 100. have.

According to an embodiment disclosed in the present specification, the wireless power transmitter 100 may supply power to a plurality of electronic devices (or wireless power receivers). In this case, wireless power signals modulated by the plurality of electronic devices may collide. Therefore, the components included in the wireless power transmitter 100 may perform various operations to avoid collision of the modulated wireless power signals.

According to an embodiment, the power conversion unit 111 may convert the power supplied from the transmission-side power supply unit 190 into a wireless power signal to transmit the wireless power signal to a plurality of electronic devices. . For example, the plurality of electronic devices may be two electronic devices, the first electronic device and the second electronic device.

In addition, the power converter 111 may form a wireless power signal for power transmission, and receive a first response signal and a second response signal corresponding to the wireless power signal.

The power transmission control unit 112 determines whether the first response signal and the second response signal collide, and transmits the power when the first response signal and the second response signal collide based on the determination result. Can be reset.

The first response signal and the second response signal may be generated by modulating the wireless power signal by the first device and the second device, respectively.

In addition, the power transmission control unit 112 may control the power conversion unit 111 such that the first response signal and the second response signal formed so as not to collide with each other as a result of resetting the power transmission are sequentially received.

The sequential reception may include receiving the first response signal after a first time interval within a predetermined response period, and receiving the second response signal after a second time interval. The second time interval may be determined based on a value generated by generating random numbers.

The predetermined response period (Tping interval) may be determined after a time period that may include both the first response signal and the second response signal, and may be determined after resetting the power transmission.

According to an embodiment, the determination of whether a collision has occurred may be made according to whether the first response signal and the second response signal are decoded using a predetermined format, and the predetermined format is a preamble and a header. And a message, when determining whether the first response signal and the second response signal collide, at least one of the preamble, header, and message has an error due to a collision, so that the first response signal and the first 2 It may be judged based on whether or not the response signal cannot be restored.

Further, according to an embodiment, the power converter 111 periodically receives a response signal of the first device that does not collide with the response signal of the second device within a first response period (Tping interval_1), and the The power transmission control unit decodes the first response signal and the second response signal using a predetermined format, and whether the first response signal and the second response signal collide based on whether the decoding is performed or not. It may be to judge. Here, the first response signal and the second response signal are periodically received within a second response period (Tping interval_2), and the second response period (Tping interval_2) includes both the first response signal and the second response signal. It may be determined to be longer than the time that can be included and may be determined after resetting the power transmission.

Figure 2B-Electronic devices

Referring to FIG. 2B, the electronic device 200 is configured to include a power supply unit 290. The power supply unit 290 supplies power required for the operation of the electronic device 200. The power supply unit 290 may include a power receiving unit 291 and a power receiving control unit 292.

The power receiver 291 receives power wirelessly transmitted from the wireless power transmitter 100.

The power receiver 291 may include components necessary for receiving the wireless power signal according to a wireless power transmission method. In addition, the power receiving unit 291 may receive power according to one or more wireless power transmission schemes, and in this case, the power receiving units 291 may include components required for each other according to each scheme.

First, the power receiving unit 291 may be configured to include a coil for receiving a wireless power signal transmitted in the form of a magnetic or electromagnetic field having vibrating characteristics.

For example, in some embodiments, the power receiver 291 may include a secondary coil in which current is induced by a changing magnetic field as a component according to an inductive coupling method. In addition, in some embodiments, the power receiving unit 291 may include a coil and a resonance forming circuit in which resonance occurs by a magnetic field having a specific resonance frequency as a component according to the resonance coupling method.

However, in some embodiments, the power receiving unit 291 may receive power according to one or more wireless power transmission methods, in which case the power receiving unit 291 is implemented to receive using one coil, or each It may be implemented to receive using a coil formed differently according to the power transmission method.

4A or 4B for embodiments that follow the inductive coupling method among the components included in the power receiving unit 291, and for embodiments that follow the resonance coupling method will be described later with reference to FIGS. 7A or 7B. .

Meanwhile, the power receiving unit 291 may further include a rectifier and a regulator for converting the wireless power signal into direct current. In addition, the power receiving unit 291 may further include a circuit to prevent overvoltage or overcurrent from being generated by the received power signal.

The power receiving control unit 292 controls each component included in the power supply unit 290.

Specifically, the power reception control unit 292 may transmit a power control message to the wireless power transmission device 100. The power control message may indicate to the wireless power transmitter 100 to start or end the transmission of the wireless power signal. Also, the power control message may indicate to the wireless power transmitter 100 to adjust the characteristics of the wireless power signal.

In some embodiments, the power reception control unit 292 may transmit the power control message through the wireless power signal. Further, in some embodiments, the power control control unit 292 may transmit the power control message through a method of transmitting through user data.

In order to transmit the power control message, the electronic device 200 may be further configured to further include a power communication modulation/demodulation unit 293 electrically connected to the power receiving unit 291. The modulation/demodulation unit 293 may be used to transmit the power control message through the wireless power signal, as in the case of the wireless power transmitter 100 described above. The modulation/demodulation unit 293 may be used as a means for adjusting the current and/or voltage flowing through the power conversion unit 111 of the wireless power transmission apparatus 100. Hereinafter, a method in which the respective modulation/demodulation units 113 and 293 of the wireless power transmission apparatus 100 side and the electronic device 200 side are used for transmission and reception of a power control message through a wireless power signal will be described.

The wireless power signal formed by the power conversion unit 111 is received by the power reception unit 291. At this time, the power receiving control unit 292 controls the modulation/demodulation unit 293 on the electronic device 200 side to modulate the wireless power signal. For example, the power reception control unit 292 may perform a modulation process such that the amount of power received from the wireless power signal changes accordingly by changing the reactance of the modulation/demodulation unit 293 connected to the power reception unit 291. have. The change in the amount of power received from the wireless power signal causes a change in the current and/or voltage of the power converter 111 forming the wireless power signal. At this time, the modulation/demodulation unit 113 on the wireless power transmitter 100 side detects a change in the current and/or voltage of the power conversion unit 111 and performs a demodulation process.

That is, the power receiving control unit 292 generates a packet including a power control message to be transmitted to the wireless power transmitter 100, modulates the wireless power signal to include the packet, and modulates the power. The transmission control unit 112 may obtain the power control message included in the packet by decoding the packet based on a result of performing the demodulation process of the modulation/demodulation unit 113. A detailed method for the wireless power transmitter 100 to obtain the power control message will be described later with reference to FIGS. 11A to 13.

In addition, in some embodiments, the power reception control unit 292 transmits a power control message by transmitting user data including a power control message by a communication means (not shown) included in the electronic device 200. It may be transmitted to the wireless power transmission device 100.

In addition, the power supply unit 290 may be configured to further include a charging unit 298 and a battery 299.

The electronic device 200 receiving power for operation from the power supply unit 290 operates by the power transmitted from the wireless power transmitter 100 or the battery 299 using the delivered power After charging ), the battery 299 may be operated by the electric power charged. At this time, the power receiving control unit 292 may control the charging unit 298 to perform charging using the transmitted power.

According to an embodiment disclosed in the present specification, a plurality of electronic devices may be supplied with power from the wireless power transmitter 100. In this case, wireless power signals modulated by the plurality of electronic devices may collide. Therefore, the components included in the electronic device 200 may perform various operations to avoid collision of the modulated wireless power signals.

According to an embodiment, the power receiver 291 may receive a wireless power signal for power transmission from a wireless power transmitter.

In this case, the power reception control unit 292 allows the power reception unit 291 to transmit a third response signal corresponding to the wireless power signal after a time interval set as a first time within a first response period (Tping interval_1). Can be controlled.

In addition, according to an embodiment, the power reception control unit 292 determines whether power transmission of the wireless power transmission apparatus 100 is reset due to collision of the modulated wireless power signals, and based on the determination result, the When the power transmission is reset, the time interval may be set as the second time.

Also, according to an embodiment, the power reception control unit 292 sets the fourth response signal corresponding to the wireless power signal by the power reception unit 291 to the second time within a second response period (Tping interval_2). It may be controlled to transmit after a time interval, and the second time may be determined based on a value generated by generating a random number.

Hereinafter, wireless power transmitters and electronic devices applicable to the embodiments disclosed herein will be described.

First, referring to FIGS. 3 to 5, according to embodiments supporting an inductive coupling method, a method of transmitting power to the electronic device by the wireless power transmitter is disclosed.

Figure 3-Inductive coupling method

3 illustrates a concept in which power is wirelessly transmitted from a wireless power transmitter to an electronic device according to embodiments supporting the inductive coupling method.

When the power transmission of the wireless power transmission device 100 follows an inductive coupling method, when the intensity of the current flowing in the primary coil in the power transmission unit 110 changes, the primary coil is applied by the current. The passing magnetic field changes. The magnetic field changed as described above generates an induced electromotive force on the secondary coil side of the electronic device 200.

According to this method, the power conversion unit 111 of the wireless power transmission device 100 is configured to include a transmission coil (Tx coil) 1111a that operates as a primary coil in magnetic induction. In addition, the power receiving unit 291 of the electronic device 200 is configured to include a receiving coil (Rx coil) 2911a acting as a secondary coil in magnetic induction.

First, the wireless power transmitter 100 and the electronic device 200 are disposed such that the transmitting coil 1111a on the wireless power transmitter 100 side and the receiving coil on the electronic device 200 side are close. Thereafter, when the power transmission control unit 112 controls the current of the transmission coil 1111a to change, the power reception unit 291 uses the electromotive force induced in the reception coil 2911a to generate the electronic device 200. It is controlled to supply power.

The efficiency of wireless power transmission by the inductive coupling method has less influence due to frequency characteristics, but the alignment and distance between the wireless power transmission device 100 and each electronic device 200 including each coil. (distance).

On the other hand, for wireless power transmission by an inductive coupling method, the wireless power transmission device 100 may be configured to include an interface surface (not shown) in the form of a flat surface. One or more electronic devices may be placed on the upper surface of the interface, and the transmission coil 1111a may be mounted on the lower surface of the interface. In this case, the vertical spacing between the transmitting coil 1111a mounted on the lower portion of the interface surface and the receiving coil 2911a of the electronic device 200 located on the upper portion of the interface surface is formed so that the coil is small. The distance between them is sufficiently small so that wireless power transfer by an inductive coupling method can be efficiently performed.

In addition, an array indicating unit (not shown) indicating the position where the electronic device 200 is to be placed may be formed on an upper portion of the interface surface. The arrangement indicating unit indicates the position of the electronic device 200 in which the arrangement between the transmitting coil 1111a mounted on the lower surface of the interface and the receiving coil 2911a can be suitably performed. In some embodiments, the arrangement indicator may be simple marks. In some embodiments, the arrangement indicator may be formed in the form of a protruding structure that guides the position of the electronic device 200. In addition, in some embodiments, the arrangement indicator is formed in the form of a magnetic material such as a magnet mounted on the lower portion of the interface surface, and the coil is formed by attraction of the magnetic material of another pole mounted inside the electronic device 200. You can also guide them to form a suitable arrangement.

Meanwhile, the wireless power transmission apparatus 100 may be formed to include one or more transmission coils. The wireless power transmitter 100 may selectively increase a power transmission efficiency by selectively using a portion of the coils that are suitably arranged with the receiving coil 2911a of the electronic device 200 among the one or more transmitting coils. The wireless power transmitter 100 including the one or more transmission coils will be described later with reference to FIG. 5.

Hereinafter, a configuration of an inductively coupled wireless power transmitter and electronic device applicable to the embodiments disclosed herein will be described in detail.

4A and 4B-Inductively coupled wireless power transmitter and electronic device

4A and 4B are block diagrams exemplarily showing a part of the configuration of the electromagnetic induction type wireless power transmitter 100 and the electronic device 200 employable in the embodiments disclosed herein. The configuration of the power transmission unit 110 included in the wireless power transmitter 100 will be described with reference to FIG. 4A, and the power supply unit 290 included in the electronic device 200 will be described with reference to FIG. 4B. The configuration of the will be described.

Referring to FIG. 4A, the power conversion unit 111 of the wireless power transmission apparatus 100 may be configured to include a transmission coil (Tx coil) 1111a and an inverter 1112.

As described above, the transmission coil 1111a forms a magnetic field corresponding to the wireless power signal according to a change in current. In some embodiments, the transmission coil 1111a may be implemented in a planar spiral type. In addition, in some embodiments, the transmission coil 1111a may be implemented in a cylindrical solenoid type.

The inverter 1112 transforms a DC input obtained from the power supply unit 190 into an AC waveform. The alternating current transformed by the inverter 1112 drives a resonant circuit including the transfer coil 1111a and a capacitor (not shown) so that a magnetic field is formed in the transfer coil 1111a. .

In addition, the power conversion unit 111 may be configured to further include a positioning unit (Positioning Unit) 1114.

The positioning unit 1114 may move or rotate the transmission coil 1111a to increase the efficiency of wireless power transmission by the inductive coupling method. This, as described above, the power transmission by the inductive coupling method is the alignment and distance (distance) between the wireless power transmission apparatus 100 and the electronic device 200 including the primary and secondary coils Because it is affected by. In particular, the location determining unit 1114 may be used when the electronic device 200 does not exist in the active area of the wireless power transmitter 100.

Therefore, the distance between the center of the transmitting coil 1111a of the wireless power transmitter 100 and the receiving coil 2911a of the electronic device 200 is a certain range of the positioning unit 1114. It is configured to include a driving unit (not shown) that moves the transmission coil 1111a so as to be within or rotates the transmission coil 1111a so that the centers of the transmission coil 1111a and the reception coil 2911a overlap. Can be.

To this end, the wireless power transmitter 100 may further include a position detection unit (not shown) made of a sensor that detects the position of the electronic device 200, and the power transmission control unit 112 ) May control the positioning unit 1114 based on the location information of the electronic device 200 received from the location sensor.

In addition, for this purpose, the power transmission control unit 112 receives control information on the arrangement or distance to the electronic device 200 through the modulation/demodulation unit 113, and based on the control information on the received arrangement or distance. The positioning unit 1114 can be controlled.

If the power conversion unit 111 is configured to include a plurality of transmission coils, the positioning unit 1114 may determine which of the plurality of transmission coils will be used for power transmission. The configuration of the wireless power transmission apparatus 100 including the plurality of transmission coils will be described later with reference to FIG. 5.

Meanwhile, the power conversion unit 111 may be configured to further include a power sensing unit 1115. The power sensing unit 1115 on the wireless power transmission device 100 side monitors the current or voltage flowing through the transmission coil 1111a. The power sensing unit 1115 is for checking whether the wireless power transmitter 100 is operating normally, and detects the voltage or current of the power supplied from the outside, and determines whether the detected voltage or current exceeds a threshold value. Can be confirmed. The power sensing unit 1115, although not shown, compares a resistor for detecting the voltage or current of a power source supplied from the outside with a voltage value or a current value of the detected power source and a threshold value and outputs the comparison result A comparator. Based on the check result of the power sensing unit 1115, the power transmission control unit 112 may control a switching unit (not shown) to cut off power applied to the transmission coil 1111a.

Referring to FIG. 4B, the power supply unit 290 of the electronic device 200 may be configured to include a receiving coil (Rx coil) 2911a and a rectifying circuit 2913.

A current is induced in the receiving coil 2911a by a change in the magnetic field formed from the transmitting coil 1111a. The implementation form of the receiving coil 2911a may be in the form of a flat helix or a cylindrical solenoid, according to embodiments as in the case of the transmitting coil 1111a.

In addition, serial/parallel capacitors may be configured to be connected to the receiving coil 2911a for increasing the reception efficiency of wireless power or for resonant detection.

The receiving coil 2911a may be in the form of a single coil or a plurality of coils.

The rectifying circuit 2913 performs full-wave rectification of the current in order to convert AC to DC. The rectifying circuit 2913 may be implemented as, for example, a full bridge rectifying circuit composed of four diodes, or a circuit using active components.

In addition, the rectifying circuit 2913 may further include a regulator that makes the rectified current a flat and stable direct current. In addition, the output power of the rectifying circuit 2913 is supplied to each component of the power supply unit 290. In addition, the rectifying circuit 2913 converts the DC power output to a suitable voltage to match the power required for each component of the power supply unit 290 (for example, a circuit such as the charging unit 298) to a DC-DC converter. (DC-DC converter) may be further included.

The modulation/demodulation unit 293 is connected to the power receiving unit 291, and may be composed of a resistive element having a resistance change for DC current, and a capacitive element having a change in reactance for AC current. Can be. The power reception control unit 292 may modulate the wireless power signal received by the power reception unit 291 by changing the resistance or reactance of the modulation/demodulation unit 293.

Meanwhile, the power supply unit 290 may be configured to further include a power sensing unit 2914. The power sensing unit 2914 on the electronic device 200 side monitors the voltage and/or current of the power rectified by the rectifying circuit 2913, and as a result of the monitoring, the voltage and/or current of the rectified power is When the threshold value is exceeded, the power reception control unit 292 transmits a power control message to the wireless power transmission device 100 to deliver appropriate power.

Figure 5-A wireless power transmission device comprising one or more transmission coils

5 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils that receive power according to an inductive coupling method employable in the embodiments disclosed herein.

Referring to FIG. 5, the power converter 111 of the wireless power transmitter 100 according to the embodiments disclosed herein may be composed of one or more transmission coils 1111a-1 to 1111a-n. The one or more transmission coils 1111a-1 to 1111a-n may be an array of partly overlapping primary coils. An active region may be determined by some of the one or more transmission coils.

The one or more transmission coils 1111a-1 to 1111a-n may be mounted under the interface surface. Further, the power converter 111 may further include a multiplexer 1113 that establishes and releases connection of some of the one or more of the transmission coils 1111a-1 to 1111a-n. .

When the position of the electronic device 200 placed on the upper surface of the interface is sensed, the power transmission control unit 112 considers the sensed position of the electronic device 200 and the one or more transmission coils 1111a-1 to Among the 1111a-n), the multiplexer 1113 may be controlled such that coils that may be in an inductive coupling relationship with the receiving coil 2911a of the electronic device 200 may be connected.

To this end, the power transmission control unit 112 may acquire location information of the electronic device 200. In some embodiments, the power transmission control unit 112 may acquire the position of the electronic device 200 on the interface surface by the position detection unit (not shown) provided in the wireless power transmission device 100. have. In still other embodiments, the power transmission control unit 112 uses the one or more transmission coils 1111a-1 to 1111a-n, respectively, to indicate a power control message indicating the strength of a wireless power signal from an object on the interface surface, or Position information of the electronic device 200 may be obtained by receiving a power control message indicating the identification information of the object and determining which of the one or more transmitting coils is close to the position based on the received result have.

Meanwhile, the active area is a part of the interface surface, and may mean a portion through which a high-efficiency magnetic field can pass when the wireless power transmitter 100 wirelessly transmits power to the electronic device 200. . At this time, a single transmission coil or a combination of one or more transmission coils that form a magnetic field passing through the active region may be referred to as a primary cell. Accordingly, the power transmission control unit 112 determines an active area based on the sensed position of the electronic device 200, and establishes a connection of a main cell corresponding to the active area to receive the electronic device 200 The multiplexer 1113 can be controlled so that the coils 2911a and the coils belonging to the main cell can be placed in an inductive coupling relationship.

Meanwhile, when one or more electronic devices 200 are disposed on the interface surface of the wireless power transmitter 100 configured to include the one or more transmission coils 1111a-1 to 1111a-n, the power transmission control unit ( 112) may control the multiplexer 1113 so that the coils belonging to the main cell corresponding to the location of each electronic device are placed in an inductive coupling relationship, respectively. Accordingly, the wireless power transmitter 100 may wirelessly transmit power to one or more electronic devices by forming wireless power signals using different coils.

In addition, the power transmission control unit 112 may be configured to supply power having different characteristics to coils corresponding to the electronic devices. In this case, the wireless power transmitter 100 may transmit power by setting a different power transmission method, efficiency, and characteristics for each electronic device. Power delivery for one or more electronic devices will be described below with reference to FIG. 28.

Meanwhile, the power converter 111 may further include an impedance matching unit (not shown) that adjusts impedance to form a resonant circuit with the connected coils.

Hereinafter, a method of transmitting power by a wireless power transmitter according to embodiments supporting a resonance coupling method will be disclosed with reference to FIGS. 6 to 8.

Fig. 6-Resonance coupling method

6 illustrates a concept in which power is wirelessly transmitted from a wireless power transmitter to an electronic device according to embodiments supporting a resonance coupling method.

First, a brief description of resonance (or resonance) is as follows. Resonance refers to a phenomenon in which an oscillating system periodically receives an external force having a frequency equal to its natural frequency, and the amplitude increases remarkably. Resonance is a phenomenon that occurs in all vibrations, such as mechanical and electrical vibrations. In general, when a force capable of vibrating the vibrating system is applied from the outside, if the natural frequency of the vibrating system and the frequency of the force applied from the outside are the same, the vibration becomes severe and the amplitude increases.

In the same principle, when a plurality of vibrating bodies that are separated within a certain distance vibrate at the same frequency with each other, the plurality of vibrating bodies resonate with each other, and in this case, resistance between the plurality of vibrating bodies is reduced. In electrical circuits, inductors and capacitors can be used to make resonant circuits.

When the power transmission of the wireless power transmission apparatus 100 follows a resonance coupling method, a magnetic field having a specific vibration frequency is formed by the AC power in the power transmission unit 110. When a resonance phenomenon occurs in the electronic device 200 by the formed magnetic field, power is generated by the resonance phenomenon in the electronic device 200.

As described above, when a plurality of vibrating bodies are electromagnetically resonant with each other, power transmission efficiency may be very high because they are not affected by surrounding objects other than the plurality of vibrating bodies. In this way, an energy tunnel may be generated between a plurality of vibrating bodies that resonate with each other electromagnetically. This is also called energy coupling or energy tail.

The resonance coupling method disclosed herein may use electromagnetic waves having a low frequency. When power is transmitted using electromagnetic waves having a low frequency, only a magnetic field is affected in an area located within a single wavelength of the electromagnetic wave. do. This can be referred to as magnetic coupling or magnetic resonance. The magnetic resonance may occur when the wireless power transmitter 100 and the electronic device 200 are located within a single wavelength of the electromagnetic wave having the low frequency.

In this case, an energy tail due to the resonance phenomenon is formed, so that the power transmission type is non-radiative. For this reason, a radiative problem that can be frequently generated by transmitting power by transmitting using electromagnetic waves can be solved.

The resonance coupling method may be a method of transmitting power using electromagnetic waves having a low frequency as described above. Therefore, in principle, the transmission coil 1111b of the wireless power transmission apparatus 100 may form a magnetic field or an electromagnetic wave for transmitting power, but in the following description, for a resonance coupling method, a magnetic resonance side, that is, a magnetic field It will be described in terms of power transmission by.

The resonance frequency may be determined by, for example, Equation 1 below.

Here, the resonance frequency f is determined by the inductance L and the capacitance C in the circuit. In a circuit for forming a magnetic field using a coil, the inductance may be determined by the number of revolutions of the coil, etc., and the capacitance may be determined by an interval, area, or the like between the coils. In addition to the coil, a capacitive resonance forming circuit may be connected to determine the resonance frequency.

Referring to FIG. 6, in embodiments in which power is wirelessly transmitted according to a resonance coupling method, the power conversion unit 111 of the wireless power transmission apparatus 100 may include a transmission coil in which a magnetic field is formed (Tx coil) ( 1111b) and the transmission coil 1111b, and may be configured to include a resonance forming circuit 1116 for determining a specific vibration frequency. The resonance forming circuit 1116 may be implemented using capacitors, and the specific vibration frequency is determined based on the inductance of the transmission coil 1111b and the capacitance of the resonance forming circuit 1116. .

The configuration of the circuit elements of the resonance forming circuit 1116 may be formed in various forms so that the power converter 111 may form a magnetic field, and is connected in parallel with the transmission coil 1111b as shown in FIG. 6. It is not limited to.

In addition, the power receiving unit 291 of the electronic device 200 includes a resonance forming circuit 2912 and a receiving coil (Rx coil) configured to cause a resonance phenomenon by a magnetic field formed in the wireless power transmitter 100 ( 2911b). That is, the resonance forming circuit 2912 may also be implemented using a capacitive circuit, and the resonance forming circuit 2912 is based on the inductance of the receiving coil 2911b and the capacitance of the resonance forming circuit 2912. The resonance frequency determined by is configured to be the same as the resonance frequency of the formed magnetic field.

The structure of the circuit element of the resonance forming circuit 2912 may be formed in various forms so that the power receiving unit 291 can be resonated by the magnetic field, and is connected in series with the receiving coil 2911b as shown in FIG. It is not limited to the form.

The specific vibration frequency in the wireless power transmitter 100 may be obtained by using Equation 1 with LTx and CTx. Here, when the result of substituting LRX and CRX of the electronic device 200 into Equation 1 is the same as the specific vibration frequency, resonance occurs in the electronic device 200.

According to embodiments that support the wireless power transmission method by resonant coupling, when the wireless power transmission device 100 and the electronic device 200 resonate at the same frequency, electromagnetic waves are transmitted through a short-range electromagnetic field, so that the frequency If is different, there is no energy transfer between the devices.

Therefore, while the efficiency of wireless power transmission by the resonance coupling method has a large influence on frequency characteristics, the arrangement and distance between the wireless power transmission device 100 and each electronic device 200 including each coil are determined. The effect is relatively small compared to the inductive coupling method.

Hereinafter, a configuration of a wireless power transmission device and an electronic device of a resonance coupling method applicable to the embodiments disclosed herein will be described in detail.

7A and 7B-Resonant coupling type wireless power transmitter

7A and 7B are block diagrams exemplarily showing a part of the configuration of the wireless power transmitter 100 and the electronic device 200 of a resonance method employable in the embodiments disclosed herein.

The configuration of the power transmission unit 110 included in the wireless power transmission device 100 will be described with reference to FIG. 7A.

The power conversion unit 111 of the wireless power transmission apparatus 100 may be configured to include a transmission coil (Tx coil) 1111b, an inverter 1112, and a resonance forming circuit 1116. The inverter 1112 may be configured to be connected to the transmission coil 1111b and the resonance forming circuit 1116.

The transmitting coil 1111b may be mounted separately from the transmitting coil 1111a for transmitting power according to the inductive coupling method, but may also transmit power in an inductive coupling method and a resonance coupling method using a single coil.

The transmission coil 1111b forms a magnetic field for transmitting electric power, as described above. When the AC power is applied to the transmission coil 1111b and the resonance forming circuit 1116, vibration may occur. At this time, vibration is generated based on the inductance of the transmission coil 1111b and the capacitance of the resonance forming circuit 1116. The frequency can be determined.

To this end, the inverter 1112 transforms the DC input obtained from the power supply unit 190 into an AC waveform, and the modified AC current is applied to the transmission coil 1111b and the resonance forming circuit 1116.

In addition, the power conversion unit 111 may be configured to further include a frequency adjustment unit 1117 for changing the resonance frequency value of the power conversion unit 111. Since the resonance frequency of the power conversion unit 111 is determined based on inductance and capacitance in the circuit constituting the power conversion unit 111 according to Equation 1, the power transmission control unit 112 may transmit the inductance and/or The resonance frequency of the power conversion unit 111 may be determined by controlling the frequency adjustment unit 1117 so that the capacitance is changed.

In some embodiments, the frequency adjusting unit 1117 may be configured to include a motor capable of changing capacitance by adjusting a distance between capacitors included in the resonance forming circuit 1116. In addition, in some embodiments, the frequency adjustment unit 1117 may be configured to include a motor capable of changing inductance by adjusting the number or turns of the transmission coil 1111b. Further, in some embodiments, the frequency adjusting unit 1117 may be configured to include active elements for determining the capacitance and/or inductance.

Meanwhile, the power conversion unit 111 may be configured to further include a power sensing unit 1115. The operation of the power sensing unit 1115 is the same as described above.

The configuration of the power supply unit 290 included in the electronic device 200 will be described with reference to FIG. 7B. The power supply unit 290, as described above, may be configured to include the receiving coil (Rx coil) 2911b and the resonance forming circuit 2912.

In addition, the power receiving unit 291 of the power supply unit 290 may be further configured to further include a rectifying circuit 2913 that converts AC current generated by a resonance phenomenon into direct current. The rectifying circuit 2913 may be configured in the same manner as described above.

In addition, the power receiving unit 291 may be further configured to further include a power sensing unit 2914 that monitors the voltage and/or current of the rectified power source. The power sensing unit 2914 may be configured in the same manner as described above.

Figure 8-A wireless power transmitter comprising one or more transmitting coils

8 is a block diagram of a wireless power transmitter configured to have one or more transmitting coils that receive power according to embodiments supporting a resonant coupling scheme.

Referring to FIG. 8, the power converter 111 of the wireless power transmitter 100 according to embodiments disclosed herein is connected to one or more transmission coils 1111b-1 to 1111b-n and respective transmission coils It may be configured to include the resonance forming circuit (1116-1 to 1116-n). Further, the power converter 111 may further include a multiplexer 1113 that establishes and releases connection of some of the one or more of the transmission coils 1111b-1 to 1111b-n. .

The one or more transmission coils 1111b-1 to 1111b-n may be set to have the same resonance frequency. In some embodiments, some of the one or more transmission coils 1111b-1 to 1111b-n may be set to have different resonant frequencies, which are the one or more transmission coils 1111b-1 to 1111b-n And the resonant forming circuits 1116-1 to 1116-n respectively connected are determined according to what inductance and/or capacitance.

Meanwhile, when one or more electronic devices 200 are disposed in an active area or a sensing area of the wireless power transmitter 100 configured to include the one or more transmission coils 1111b-1 to 1111b-n, the power transmission The control unit 112 may control the multiplexer 1113 to be in a different resonance coupling relationship for each electronic device. Accordingly, the wireless power transmitter 100 may wirelessly transmit power to one or more electronic devices by forming wireless power signals using different coils.

In addition, the power transmission control unit 112 may be configured to supply power having different characteristics to coils corresponding to the electronic devices. In this case, the wireless power transmitter 100 may transmit power by setting a different power transmission method, resonance frequency, efficiency, characteristics, and the like for each electronic device. Power delivery for one or more electronic devices will be described below with reference to FIG. 28.

To this end, the frequency adjusting unit 1117 changes the inductance and/or capacitance of the resonance forming circuits 1116-1 to 1116-n, respectively connected to the one or more transmission coils 1111b-1 to 1111b-n. It can be configured to allow.

Figure 9-Wireless power transmitter implemented as a charger

Meanwhile, an example of the wireless power transmission device implemented in the form of a wireless charger will be described below.

9 is a block diagram illustrating a wireless power transmission apparatus further including an additional configuration in addition to the configuration shown in FIG. 2A.

As can be seen with reference to Figure 9, the wireless power transmission device 100, in addition to the power transmission unit 110 and the power supply unit 190 supporting one or more of the inductive coupling method and the resonance coupling method described above, The sensor unit 120, the communication unit 130, the output unit 140, the memory 150 and the control unit 180 may be further included.

The control unit 180 controls the power conversion unit 110, the sensor unit 120, the communication unit 130, the output unit 140, the memory 150 and the power supply unit 190.

The control unit 180 may be implemented as a separate module or a single module from the power transmission control unit 112 in the power conversion unit 110 described with reference to FIG. 2A or 2B.

The sensor unit 120 may be configured to include a sensor that detects the location of the electronic device 200. The location information sensed by the sensor unit 120 may be used so that the power conversion unit 110 can efficiently transmit power.

For example, in the case of wireless power transfer according to embodiments that support the inductive coupling method, the sensor unit 120 may operate as a position detection unit, and the position information detected by the sensor unit 120 may be It may be used to move or rotate the transmission coil 1111a in the power converter 110.

In addition, for example, the wireless power transmitter 100 according to embodiments including one or more of the transmission coils described above may be the electronic device among the one or more transmission coils based on the location information of the electronic device 200. Coils that may be placed in an inductive coupling relationship or a resonance coupling relationship with the receiving coil of 200 may be determined.

On the other hand, the sensor unit 120 may be configured to monitor whether the electronic device 200 is approaching a charging area. The function of detecting whether the sensor unit 120 is approaching may be performed separately or in combination with a function of the power transmission control unit 112 in the power transmission unit 110 detecting whether the electronic device 200 is approaching or not. .

The communication unit 130 performs wired and wireless data communication with the electronic device 200. The communication unit 130 may include electronic components for any one or more of BluetoothTM, Zigbee, Ultra Wide Band (UWB), Wireless USB, Near Field Communication (NFC), and Wireless LAN.

The output unit 140 includes at least one of a display unit 141 and an audio output unit 142. The display unit 141 includes a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), and a flexible display ( flexible display), and a 3D display. The display unit 141 may display a charging state under the control of the control unit 180.

The memory 150 is a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory, etc.), Random Access Memory (RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), magnetic memory, It may include a storage medium of at least one of a magnetic disk and an optical disk. The wireless power transmission apparatus 100 may operate in connection with a web storage performing a storage function of the memory 150 on the Internet. In the memory 150, programs or commands for performing the above-described functions of the wireless power transmitter 100 may be stored. The controller 180 may execute programs or commands stored in the memory 150 to transmit power wirelessly. Other components (for example, the controller 180) included in the wireless power transmitter 100 may use a memory controller (not shown) to access the memory 150.

The configuration of the wireless power transmission device according to the embodiment disclosed in the present disclosure disclosed above is also applicable to devices such as a docking station, a terminal cradle device, and other electronic devices, except when applicable only to a wireless charger. It will be readily apparent to those skilled in the art that this is possible.

Figure 10-Wireless power receiving device implemented as a mobile terminal

10 illustrates a configuration in the case where the electronic device 200 according to the embodiments disclosed herein is implemented in the form of a mobile terminal.

The mobile communication terminal 200 includes a power supply unit 290 shown in FIGS. 2A, 2B, 4A, 4B, 7A, or 7B.

In addition, the terminal 200 includes a wireless communication unit 210, an audio/video (A/V) input unit 220, a user input unit 230, a sensing unit 240, an output unit 250, a memory 260, The interface unit 270 and the control unit 280 may be further included. Since the components shown in FIG. 10 are not essential, a terminal having more or fewer components may be implemented.

Hereinafter, the components will be described in turn.

The wireless communication unit 210 enables wireless communication between the terminal 200 and the wireless communication system, between the terminal 200 and the network where the terminal 200 is located, or between the terminal 200 and the wireless power transmitter 100. It can include one or more modules that allow you to do so. For example, the wireless communication unit 210 may include a broadcast reception module 211, a mobile communication module 212, a wireless Internet module 213, a short-range communication module 214, and a location information module 215. .

The broadcast receiving module 211 receives a broadcast signal and/or broadcast-related information from an external broadcast center through a broadcast channel.

The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast center may refer to a server that generates and transmits broadcast signals and/or broadcast-related information or a server that receives previously generated broadcast signals and/or broadcast-related information and transmits them to a terminal. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, and a data broadcast signal, and may also include a TV broadcast signal or a radio broadcast signal combined with a data broadcast signal.

The broadcast-related information may mean information related to a broadcast channel, a broadcast program, or a broadcast service provider. The broadcast-related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 212.

The broadcast-related information may exist in various forms. For example, it may exist in the form of an Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB) or an Electronic Service Guide (ESG) of Digital Video Broadcast-Handheld (DVB-H).

The broadcast receiving module 211 includes, for example, DMB-T (Digital Multimedia Broadcasting-Terrestrial), DMB-S (Digital Multimedia Broadcasting-Satellite), MediaFLO (Media Forward Link Only), DVB-H (Digital Video Broadcast) Digital broadcasting signals can be received using digital broadcasting systems such as -Handheld) and ISDB-T (Integrated Services Digital Broadcast-Terrestrial). Of course, the broadcast receiving module 211 may be configured to be suitable for other broadcasting systems as well as the digital broadcasting system described above.

The broadcast signal and/or broadcast-related information received through the broadcast receiving module 211 may be stored in the memory 260.

The mobile communication module 212 transmits and receives a radio signal to and from at least one of a base station, an external terminal, and a server on a mobile communication network. The radio signal may include various types of data according to transmission and reception of a voice call signal, a video call signal, or a text/multimedia message.

The wireless Internet module 213 refers to a module for wireless Internet access, and may be built in or external to the terminal 200. Wireless Internet technology (Wireless LAN) (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) may be used.

The short-range communication module 214 refers to a module for short-range communication. Bluetooth (Bluetooth®), Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee®, etc. may be used as a wireless short range communication technology. On the other hand, USB (Universal Serial Bus), IEEE 1394, Thunderbolt (ThunderboltTM), etc. may be used for wired short-range communication.

The wireless Internet module 213 or the short-range communication module 214 may establish a data communication connection with the wireless power transmitter 100.

Through the established data communication, the wireless Internet module 213 or the short-range communication module 214 transmits power wirelessly, and when there is an audio signal to be output, the audio signal is transmitted through the short-range communication module. It can be transmitted to the wireless power transmission device 100. In addition, through the established data communication, the wireless Internet module 213 or the short-range communication module 214 may transmit the information to the wireless power transmitter 100 when there is information to display. Alternatively, through the established data communication, the wireless Internet module 213 or the short-range communication module 214 may receive an audio signal input through a microphone embedded in the wireless power transmitter 100. In addition, the wireless Internet module 213 or the short-range communication module 214 uses the wireless power through the established data communication to identify the identification information (eg, a phone number or a device name in the case of a mobile phone) of the mobile terminal 200. It can be transmitted to the transmission device 100.

The location information module 215 is a module for acquiring the location of the terminal, for example, a Global Position System (GPS) module.

Referring to FIG. 10, the A/V (Audio/Video) input unit 220 is for inputting an audio signal or a video signal, and may include a camera 221 and a microphone 222. The camera 221 processes image frames such as still images or moving images obtained by an image sensor in a video call mode or a shooting mode. The processed image frame may be displayed on the display unit 251.

The image frames processed by the camera 221 may be stored in the memory 260 or transmitted to the outside through the wireless communication unit 210. Two or more cameras 221 may be provided according to the use environment.

The microphone 222 receives an external sound signal by a microphone in a call mode, a recording mode, or a voice recognition mode, and processes it as electrical voice data. The processed voice data may be converted into a form transmittable to a mobile communication base station through the mobile communication module 212 and output. Various noise reduction algorithms for removing noise generated in the process of receiving an external sound signal may be implemented in the microphone 222.

The user input unit 230 generates input data for the user to control the operation of the terminal. The user input unit 230 may be configured with a key pad dome switch, a touch pad (static pressure/power outage), a jog wheel, a jog switch, or the like.

The sensing unit 240 may include a proximity sensor 241, a pressure sensor 242, and a motion sensor 243. The proximity sensor 241 enables the presence or absence of an object approaching the mobile terminal 200 or an object existing in the vicinity of the mobile terminal 200 to be detected without mechanical contact. The proximity sensor 241 may detect a proximity object using a change in an alternating magnetic field, a change in a static magnetic field, or a rate of change in capacitance. Two or more proximity sensors 241 may be provided according to a configuration aspect.

The pressure sensor 242 may detect whether pressure is applied to the mobile terminal 200 and the magnitude of the pressure. The pressure sensor 242 may be installed at a portion where pressure is detected in the mobile terminal 200 according to the use environment. If, when the pressure sensor 242 is installed on the display unit 251, according to the signal output from the pressure sensor 242, the touch input through the display unit 251, and greater pressure than the touch input The applied pressure touch input can be identified. In addition, according to a signal output from the pressure sensor 242, it is also possible to know the magnitude of the pressure applied to the display unit 251 when a pressure touch is input.

The motion sensor 243 detects the position or movement of the mobile terminal 200 using an acceleration sensor, a gyro sensor, or the like. The acceleration sensor that can be used in the motion sensor 243 is a device that converts an acceleration change in one direction into an electrical signal. The acceleration sensor is usually constructed by mounting two or three axes in one package, and depending on the environment of use, only one axis of the Z axis may be required. Therefore, if for some reason an acceleration sensor in the X-axis or Y-axis direction should be used instead of the Z-axis direction, the acceleration sensor may be mounted on the main board by using a separate engraving substrate. In addition, the gyro sensor is a sensor that measures the angular velocity of the mobile terminal 200 that rotates, and can sense a rotated angle with respect to each reference direction. For example, the gyro sensor may sense respective rotation angles based on axes in three directions, that is, azimuth, pitch, and roll.

The output unit 250 is for generating output related to vision, hearing, or tactile sense, and includes a display unit 251, an audio output module 252, an alarm unit 253, and a haptic module 254. Can.

The display unit 251 displays (outputs) information processed by the terminal 200. For example, when the terminal is in a call mode, a UI (User Interface) or a GUI (Graphic User Interface) related to the call is displayed. When the terminal 200 is in a video call mode or a photographing mode, it displays a photographed or/and received video, UI, or GUI.

The display unit 251 includes a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), and a flexible display (flexible) display) and a 3D display.

Some of these displays may be of a transparent type or a light transmissive type so that the outside can be seen through them. This may be called a transparent display, and a typical example of the transparent display is TOLED (Transparent OLED). The rear structure of the display unit 251 may also be configured as a light transmissive structure. With this structure, the user can see an object located behind the terminal body through an area occupied by the display unit 251 of the terminal body.

Two or more display units 251 may be present depending on the implementation form of the terminal 200. For example, a plurality of display units may be spaced apart from one surface or integrally disposed in the terminal 200, or may be respectively disposed on different surfaces.

When the display unit 251 and a sensor detecting a touch operation (hereinafter, referred to as a “touch sensor”) form a mutual layer structure (hereinafter, referred to as a “touch screen”), the display unit 251 may be used in addition to an output device. It can also be used as an input device. The touch sensor may have, for example, a form of a touch film, a touch sheet, and a touch pad.

The touch sensor may be configured to convert a change in pressure applied to a specific portion of the display unit 251 or a capacitance generated in a specific portion of the display unit 251 into an electrical input signal. The touch sensor may be configured to detect not only the touched position and area, but also the pressure at the time of touch.

If there is a touch input to the touch sensor, the corresponding signal(s) is sent to the touch controller. The touch controller processes the signal(s) and then transmits corresponding data to the control unit 280. Accordingly, the control unit 280 can know which area of the display unit 251 has been touched, and the like.

A proximity sensor 241 may be disposed in an inner region of the terminal surrounded by the touch screen or near the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or an object in the vicinity using mechanical force or infrared light without mechanical contact. Proximity sensors have a longer lifespan and higher utilization than contact sensors.

Examples of the proximity sensor include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive type proximity sensor, a magnetic type proximity sensor, and an infrared proximity sensor. When the touch screen is capacitive, it is configured to detect the proximity of the pointer due to a change in electric field according to the proximity of the pointer. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

Hereinafter, for convenience of description, an action of causing the pointer to be recognized as being located on the touch screen without touching the pointer on the touch screen is referred to as “proximity touch”, and the touch The act of actually touching the pointer on the screen is referred to as "contact touch". The location on the touch screen that is a proximity touch with a pointer means a location where the pointer is perpendicular to the touch screen when the pointer is touched close.

The proximity sensor detects a proximity touch and a proximity touch pattern (eg, proximity touch distance, proximity touch direction, proximity touch speed, proximity touch time, proximity touch position, proximity touch movement state, etc.). Information corresponding to the sensed proximity touch operation and proximity touch pattern may be output on the touch screen.

The audio output module 252 may output audio data received from the wireless communication unit 210 or stored in the memory 260 in a call signal reception, call mode or recording mode, voice recognition mode, broadcast reception mode, and the like. The sound output module 252 may also output sound signals related to functions (for example, call signal reception sound, message reception sound, etc.) performed by the terminal 200. The sound output module 252 may include a receiver, a speaker, and a buzzer.

The alarm unit 253 outputs a signal for notifying the occurrence of the event of the terminal 200. Examples of events generated in the terminal include call signal reception, message reception, key signal input, and touch input. The alarm unit 253 may also output a signal for notifying the occurrence of an event in a form other than a video signal or an audio signal, for example, vibration. The video signal or the audio signal may also be output through the display unit 251 or the audio output module 252, so that they 251 and 252 may be classified as part of the alarm unit 253.

The haptic module 254 generates various tactile effects that the user can feel. A typical example of the tactile effect generated by the haptic module 254 is vibration. The intensity and pattern of vibration generated by the haptic module 254 is controllable. For example, different vibrations may be synthesized and output or sequentially output.

In addition to vibration, the haptic module 254 is used for stimulation such as a pin arrangement that vertically moves with respect to the contact skin surface, a jet or suction force of air through a jet or intake, a grazing on the skin surface, contact with an electrode, and electrostatic force. Various tactile effects can be generated, such as an effect caused by an effect and an effect of reproducing a feeling of cold and warm using an element capable of absorbing heat or generating heat.

The haptic module 254 may not only deliver the tactile effect through direct contact, but may also be implemented so that the user can feel the tactile effect through muscle sensations such as fingers or arms. Two or more haptic modules 254 may be provided according to a configuration aspect of the terminal 200.

The memory 260 may store a program for the operation of the control unit 280, and may temporarily store input/output data (eg, a phone book, a message, a still image, a video, etc.). The memory 260 may store data related to various patterns of vibration and sound output when a touch is input on the touch screen.

In some embodiments, an operating system (not shown) in the memory 260, a module performing a function of the wireless communication unit 210, a module operating together with the user input unit 230, and an A/V input unit 220 Software components including a module operating together with a module operating together with an output unit 250 may be stored. The operating system (e.g., LINUX, UNIX, OS X, WINDOWS, Chrome, Symbian, iOS, Android, VxWorks or other embedded operating system) is a variety of software to control system tasks such as memory management, power management, etc. Components and/or drivers.

In addition, the memory 260 may store a setup program related to wireless power transmission or wireless charging. The setting program may be executed by the control unit 280.

In addition, the memory 260 may store an application related to wireless power transmission (or wireless charging) downloaded from an application providing server (eg, an app store). The wireless power transmission-related application is a program for controlling wireless power transmission, and the electronic device 200 receives power wirelessly from the wireless power transmission device 100 through the corresponding program or the wireless power transmission device 100 ) And establish a connection for data communication.

The memory 260 is a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or xD memory, etc.), RAM (Random Access Memory, RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), magnetic memory, magnetic It may include a storage medium of at least one type of disk, optical disk. The terminal 200 may operate in connection with a web storage that performs a storage function of the memory 260 on the Internet.

The interface unit 270 serves as a passage with all external devices connected to the terminal 200. The interface unit 270 receives data from an external device, receives power, transfers it to each component inside the terminal 200, or allows data inside the terminal 200 to be transmitted to the external device. For example, wired/wireless headset port, external charger port, wired/wireless data port, memory card port, port for connecting devices equipped with an identification module, audio input/output (I/O) port, A video input/output (I/O) port, an earphone port, and the like may be included in the interface unit 270.

The identification module is a chip that stores various information for authenticating the usage rights of the terminal 200, a user identification module (UIM), a subscriber identity module (SIM), and a universal user authentication module (Universal) Subscriber Identity Module, USIM). The device equipped with the identification module (hereinafter referred to as'identification device') may be manufactured in a smart card format. Therefore, the identification device may be connected to the terminal 200 through a port.

When the terminal 200 is connected to an external cradle, the interface unit becomes a passage through which power from the cradle is supplied to the terminal 200, or various command signals input from the cradle by a user are transmitted to the terminal It can be a passage. Various command signals or power inputted from the cradle may be operated as signals for recognizing that the terminal is correctly mounted on the cradle.

The control unit (controller 280) usually controls the overall operation of the terminal. For example, it performs related control and processing for voice calls, data communication, video calls, and the like. The control unit 280 may include a multimedia module 281 for multimedia playback. The multimedia module 281 may be implemented in the control unit 280, or may be implemented separately from the control unit 280. In addition, the control unit 180 may be implemented as a separate module or a single module from the power reception control unit 292 in the power supply unit 290 described with reference to FIG. 2A or 2B.

The control unit 280 may perform a pattern recognition process capable of recognizing handwriting input or picture drawing input performed on the touch screen as text and images, respectively.

The control unit 280 performs wired charging or wireless charging according to a user input or an internal input. Here, the internal input is a signal informing that the induced current generated by the secondary coil inside the terminal has been detected.

As described above, the power reception control unit 292 in the power supply unit 290 may be implemented by being included in the control unit 280, and the operation by the power reception control unit 292 herein is the control unit 280. ) Can be understood as performing.

The power supply unit 290 receives external power and/or internal power under the control of the controller 280 and supplies power required for the operation of each component.

The power supply unit 290 includes a battery 299 that supplies power to each component of the terminal 200, and may include a charging unit 298 for charging the battery 299 by wire or wirelessly.

Although this specification discloses a mobile terminal as an apparatus for receiving power wirelessly as an example, the configuration according to the embodiment described in this specification is also applied to a fixed terminal such as a digital TV, desktop computer, etc., except when applicable only to the mobile terminal It will be readily apparent to those skilled in the art that it may be applied.

11 is a front perspective view of a charger according to an embodiment of the present invention.

The body 303 of the charger 300 includes a case (casing, housing, cover, etc.) forming an exterior. In this embodiment, the case may be divided into a front case 301 and a rear case 302. Various electronic components are embedded in a space formed between the front case 301 and the rear case 302. At least one intermediate case may be additionally disposed between the front case 301 and the rear case 302.

The cases may be formed by injecting synthetic resin or may be formed to have a metal material, for example, a metal material such as stainless steel (STS) or titanium (Ti).

The body may include an output unit such as a display unit or an audio output unit, a user input unit, a socket 389 formed to supply power to the body, or an interface (not shown) in which external devices are coupled.

The display unit 341 may be formed on the upper surface of the front case 301. The user input unit 360 and the socket 389 may be disposed on the side surfaces of the front case 301 and the rear case 302.

The user input unit 360 is operated to receive a command for controlling the operation of the mobile terminal 100, and may include a plurality of operation units 361 and 362. The operation units 361 and 362 may also be collectively referred to as a manipulation portion, and any method may be employed as long as the user operates with a tactile feeling.

Contents input by the first or second operation units 361 and 362 may be variously set. For example, the first operation unit 361 may receive a command such as start or end of charging, and the second operation unit 362 may adjust or display the volume of sound output from the sound output unit 342. A command such as brightness adjustment of 341 may be input.

In addition, a seating surface 301a on which the electronic device 200 to be charged is placed is formed on the upper surface of the body 303. When the electronic device 200 is placed on the seating surface 301a, the sensing sensor included in the body 303 may detect this and wireless charging may start.

12 is a perspective view of an example of a mobile terminal related to the present invention as viewed from the front, and FIG. 13 is a rear perspective view of the mobile terminal shown in FIG. 12.

12 and 13, the mobile terminal 400 includes a bar-shaped terminal body 404. However, the present invention is not limited to this, and can be applied to various structures such as a slide type, a folder type, and a swing type in which two or more bodies are movably coupled. Further, the mobile terminal described herein is any portable electronic device having a camera and a flash, for example, a mobile phone, a smart phone, a notebook computer, a terminal for digital broadcasting, and PDAs (Personal Digital Assistants). ), PMO (Portable Multimedia Player).

The mobile terminal 400 according to the present invention includes a terminal body 404 constituting its appearance.

The case (casing, housing, cover, etc.) forming the exterior of the terminal body 404 is formed by the front case 401, the rear case 402, and the battery case 403. The battery case 403 is formed to cover the rear surface of the rear case 402.

Various electronic components are embedded in the space formed between the front case 401 and the rear case 402. The cases may be formed by injecting synthetic resin or may be formed to have a metal material, for example, a metal material such as stainless steel (STS) or titanium (Ti).

The front surface of the terminal body 404 includes a display unit 410, a first sound output unit 411, a front camera unit 416, a side key 414, an interface unit 415, and a signal input unit 417. .

The display unit 410 includes a liquid crystal display (LCD) module that visually expresses information, an organic light emitting diodes (OLED) module, and e-paper. The display unit 410 may include touch sensing means for input by a touch method. Hereinafter, the display unit 410 including the touch sensing means will be referred to as a'touch screen'. If there is a touch on any one location on the touch screen 410, content corresponding to the touched location is input. The content input by the touch method may be a letter or a number, or an instruction or designable menu item in various modes. The touch sensing means is formed to be transparent so that the display unit can be seen, and a structure for increasing the visibility of the touch screen in a bright place may be included. According to FIG. 2, the touch screen 410 occupies most of the front surface of the front case 401.

The first sound output unit 411 may be implemented in the form of a receiver that transmits a call sound to a user's ear or a loud speaker that outputs various alarm sounds or multimedia playback sounds.

The front camera unit 416 processes a video frame such as a still image or video obtained by an image sensor in a video call mode or a shooting mode. The processed image frame may be displayed on the display unit 410.

The image frames processed by the front camera 416 may be stored in the memory 160 or transmitted to the outside through the wireless communication unit 110. Two or more front cameras 416 may be provided according to the use environment.

The signal input unit 417 is operated to receive a command for controlling the operation of the mobile terminal 400, and may include a plurality of input keys. The input keys may also be collectively referred to as a manipulating portion, and any method may be employed as long as the user has a tactile feeling and operates the tactile manner.

For example, a dome switch or a touch screen that can receive a command or information by a user's push or touch operation, a touch pad, or a wheel or jog that rotates a key or a method that operates with a joystick. Can. Contents input by the signal input unit 417 may be variously set. For example, it may be for inputting start, end, scroll, and the like.

A side key 414, an interface unit 415, and an audio input unit 413 are disposed on the side surface of the front case 401.

The side key 414 may be collectively referred to as an operation unit, and is capable of receiving a command for controlling the operation of the mobile terminal 400. The side key 414 may be employed in any manner as long as the user operates it while having a tactile feeling. Content inputted by the side key 414 may be variously set. For example, by the side key 414, such as control of the image input unit 416, 221, the size of the sound output from the sound output unit 411, or the display unit 410 to switch to the touch recognition mode, etc. Commands can be entered.

The sound input unit 413 may be implemented in the form of a microphone, for example, in order to receive a user's voice, other sounds, and the like.

The interface unit 415 serves as a path through which the mobile terminal 400 related to the present invention can exchange data with an external device. For example, the interface unit 415 is wired or wireless, a connection terminal for connecting with an earphone, a port for short-range communication (for example, an infrared port (IrDA Port), a Bluetooth port, a wireless LAN port ( Wireless LAN Port), etc., or at least one of power supply terminals for supplying power to the mobile terminal 400. The interface unit 415 may be implemented in the form of a socket that accommodates an external card such as a subscriber identification module (SIM) or a user identity module (UIM), a memory card for storing information.

A power supply unit 440 and a rear camera unit 421 are disposed on the rear surface of the terminal body 404.

A flash 422 and a mirror (not shown) may be disposed adjacent to the rear camera unit 421. The flash illuminates toward the subject when photographing the subject with the rear camera unit 421.

The mirror allows the user to see his/her face or the like when the user wants to photograph (self-photograph) himself using the rear camera unit 421.

The rear camera portion 421 has a shooting direction substantially opposite to the front camera portion 416 disposed on the front side, and may be a camera having different pixels from the front camera portion 416.

For example, the front camera unit 416 has a low pixel so that it is easy to take a user's face in the case of a video call and transmit it to the other party, and the rear camera unit 421 photographs a general subject and immediately transmits it. Since it is often not done, it is preferable to have a high pixel. The front and rear camera units 416 and 221 may be installed on the terminal body 404 to be rotatable or pop-up.

The battery 440 supplies power to the mobile terminal 400. The battery 440 may be built in the terminal body 404, or may be configured to be detachable directly from the outside of the terminal body 404.

14A is a conceptual diagram of a wireless charging system related to an embodiment of the present invention, and FIG. 14B is a diagram illustrating an example in which foreign materials (FO) are introduced into a space in which a flux linkage is formed, and FIG. 15 is It is a block diagram of a wireless charging system related to an embodiment of the present invention.

14A, the wireless charging system 10 may include wireless power transmitters 100 and 300 and wireless power receivers 200 and 400. The wireless power receivers 200 and 400 may be, for example, the mobile terminal 400, and the wireless power transmitters 100 and 300 may be, for example, the charger 300 in which the mobile terminal can be disposed on the upper surface. have.

The charger includes a transmission coil (Tx Coil) for transmitting wireless power, and the mobile terminal may include a reception coil (Rx Coil) for receiving power from the transmission coil (Tx Coil). In FIG. 14A, lines 1 and 2 are center lines passing through the transmission coil (Tx Coil) and the reception coil (Rx Coil), respectively, and when line 1 and line 2 coincide, charging efficiency may increase during wireless charging. That is, charging efficiency may be affected by the arrangement of the mobile terminal placed on one side of the charger.

Referring to FIG. 14B, when an external material enters a space in which a flux linkage is formed by a transmitting coil (Tx Coil) and a receiving coil (Rx Coil), the efficiency and performance of the wireless charging system 10 decreases, and the external material It can be heated by the flux linkage. Such an external material may be, for example, a conductor such as a coin, and the external material may be heated to a temperature higher than a certain level, resulting in a user's burn, and wireless power transmitters 100 and 300 constituting the wireless charging system 10 Alternatively, the wireless power receivers 200 and 400 may be damaged by heat.

15, the wireless charging system 10 related to an embodiment of the present invention will be described in more detail. The wireless charging system 10 includes wireless power transmitters 100 and 300 and wireless power receivers 200 and 400. ).

The wireless power transmitters 100 and 300 may include a power transmission unit 110 and a power supply unit 190. The power transmission unit may include a transmission control unit 112 and a power conversion unit (first coil unit 111). In addition, the first coil unit may include a transmission coil (Tx Coil) formed to transmit wireless power.

The wireless power transmitters 100 and 300 may include a transmitting communication unit 117b, which is a means for transmitting and receiving data wirelessly with the receiving communication unit 217b of the wireless power receiving devices 200 and 400. Data can be transmitted and received wirelessly using a communication method.

The transmission control unit is a microcomputer that controls the wireless power transmission devices 100 and 300 as a whole, and can control the wireless power transmission devices 100 and 300 according to a preset process, and transmits data transmitted from the transmission communication unit. Based on this, it is possible to control the wireless power transmitters 100 and 300. Also, the transmission control unit may control the wireless power transmission devices 100 and 300 based on the signal detected by the detection unit.

Meanwhile, the wireless power receivers 200 and 400 may include a power supply unit 290 and a battery (LOAD) 299. The power supply unit may include a reception control unit 292 and a power reception unit (second coil unit, 291). In addition, the second coil unit may include a receiving coil (Rx Coil) formed to receive wireless power.

The wireless power transmission devices 100 and 300 may include a reception communication unit, and the reception communication unit is a means for transmitting and receiving data wirelessly with the transmission communication units of the wireless power transmission devices 100 and 300, and wirelessly using various communication methods. Can send and receive data.

The reception control unit is a kind of microcomputer that controls the wireless power receiving devices 200 and 400 as a whole or only a part related to power, and can control the wireless power receiving devices 200 and 400 according to a preset process. The wireless power receivers 200 and 400 may be controlled based on data transmitted from the communication unit. In addition, the reception control unit may control the wireless power transmission devices 100 and 300 based on the signals detected by the detection units 117a and 217a.

In addition, either one of the wireless power receivers 200 and 400 or the wireless power transmitters 100 and 300 may further include an alarm unit (not shown). The alarm unit is formed to output a signal for notifying the occurrence of an event. The transmitting or receiving control unit may output a preset signal through the alarm unit before adjusting the current supplied to the coil unit.

Referring back to FIGS. 14B and 15, when a foreign material enters a space in which a flux linkage is formed, a transmission control unit of the wireless power transmitters 100 and 300 has a predetermined inductance or impedance when a signal sensed from the first coil unit is set. When out of range, the current supplied to the first coil unit can be adjusted. Adjusting the current means that the current supplied to the first coil part is cut off or a small amount of current is supplied to the first coil part.

To this end, the sensing unit may detect an inductance or impedance change of the transmission coil (Tx Coil) and transmit the detected result to the transmission control unit.

The sensing unit may measure inductance or impedance in various ways, but may be measured by the following method, for example.

First, a digital signal processor (DSP) can be used. That is, the inductance value of the coil can be sensed through calculation by applying a sine wave current having a certain frequency and a certain peak value to the coil using a DSP and sensing the peak value of the voltage applied at this time. Equation 2 is a relational expression of inductance, voltage, and current.

That is, by knowing the peak value of the voltage applied when a current having a constant peak value and a period is applied to the coil, the inductance value of the coil can be easily calculated.

The second method is to directly detect the inductance value or impedance value of a transmitting coil (Tx Coil) or a receiving coil (Rx Coil) using a transistor and an ammeter.

In the wireless charging system 10, the sensing unit may be formed on the wireless charging receiving device, and the sensing unit formed on the wireless charging receiving device may measure the inductance or impedance of the receiving coil (Rx Coil) of the second coil unit.

For example, the wireless charging system 10 may adjust the current supplied to the first coil unit when the signal sensed from the second coil unit as well as the first coil unit is outside a predetermined inductance or impedance range. This is because when the inductance or the impedance of one coil part changes due to the mutual induction effect by an electric or magnetic field, the inductance or impedance of the other coil part also changes.

That is, when the wireless power transmitters 100 and 300 have a first coil portion and the wireless power receivers 200 and 400 have a second coil portion, the inductance or impedance of the first coil portion is measured, or After measuring the inductance or impedance of the second coil unit, a current supplied to the first coil unit may be cut off or a small amount of current may be supplied to the first coil unit according to the measured result.

For example, when a change in inductance or impedance of the second coil unit is detected, the sensed data is transmitted to the reception control unit, and the reception control unit may transmit the data through the transmission communication unit to the transmission control unit through the reception communication unit. At this time, the transmission control unit may block the current to the first coil unit based on the transmitted data or supply a small amount of current to the first coil unit.

In the wireless charging system 10, it is also possible to adjust the current supplied to the first coil unit by detecting only the inductance or impedance change of the first coil unit.

In addition, any one of the reception control unit and the transmission control unit may control the current supplied to the first coil unit. When the reception control unit controls, a signal related to the control may be transmitted to the transmission control unit through the communication units.

As described above, the wireless power transmission apparatus 100 or 300 or the wireless charging system 10 according to an embodiment of the present invention is supplied to the first coil unit when a signal sensed from the coil unit is outside a predetermined inductance or impedance range. Even if the external material is disposed in the space where the flux linkage is formed by adjusting the current, the efficiency and performance of the wireless charging system 10 may be deteriorated, or the foreign material may be prevented from being heated by the flux linkage.

16 shows the magnitude of the current supplied to the load and the wireless power transmitters 100 and 300 and the wireless power receivers 200 and 400, respectively, when there is no foreign material in the space where the flux linkage is formed and when there is an external material. It is a diagram showing a change in inductance or impedance according to the alignment state of the liver. And, Figure 17 is the size of the current supplied to the load in the case where there is no foreign material and when there is no foreign material in the space where the flux linkage is formed, and the wireless power transmitters 100 and 300 and the wireless power receiver 200, 400) is a diagram showing a change in inductance or impedance according to the alignment state. FIG. 17 shows a case in which the current supplied to the load in FIG. 16 is cut off or is very small. In the figure, the center, left, or right indicates that the line 2 is spaced apart by the intervals indicated by the center, left or right based on line 1 of the wireless power receivers 200 and 400.

Referring to FIG. 16, it can be confirmed that the inductance or impedance value calculated when there is no foreign substance generally has a value between 4.8 uH and 7.8 uH and when there is an external substance, it has a value between 3.9 uH and 4.7 uH. . That is, when there are foreign substances, inductance or impedance values may be classified as being located above the graph when there are no foreign substances.

In addition, referring to FIG. 17 as a case where the current supplied to the load is cut off or has a small amount, the inductance or impedance value shows a difference of 3 uH with and without foreign substances, and is clearly divided into upper and lower regions of the graph. Able to know. That is, it can be confirmed that the difference between the value that can be distinguished in the case where the current supplied to the load is cut off or is very small when there is or is not a foreign substance. As described above, after blocking the current supplied to the load or supplying only a small amount, the inductance or impedance of the coil part is measured, and it is checked whether the value is out of the predetermined range, and foreign substances in the space where the flux linkage is formed You can check whether it has flowed.

18 is a view showing a change in inductance according to the magnitude of the current supplied to the load and the alignment state between the wireless power transmitters 100 and 300 and the wireless power receivers 200 and 400.

Even when the arrangement state between the transmitting coil and the receiving coil (Rx Coil) is more distorted, the control method according to the embodiment of the present invention can check whether the foreign material is introduced.

Referring to FIG. 18, even when the arrangement between the transmitting coil and the receiving coil (Rx Coil) is shifted to the left or right by 15 mm, a low load (10mA to 50mA) is supplied only with a no-load or a small amount of current that blocks the current supplied to the load. ), the value of inductance or impedance is similar, and it can be confirmed that convergence to one point makes it possible to distinguish it from the value when foreign substances are introduced.

That is, the detection method according to the present invention can detect the inflow of foreign substances when there is no load or low load (10mA to 50mA) even in a situation in which the arrangement between the transmitting coil and the receiving coil (Rx Coil) is much different.

19 is a flowchart illustrating an example of a control method of the wireless charging system 10 in a state of preparing for charging.

The charging ready state is a state in which the wireless power receiving devices 200 and 400 are not yet started to transmit wireless power after being disposed close to the wireless power transmitting devices 100 and 300. When a signal to switch from a charging ready state to a charging state is input, wireless power may be transmitted from the first coil unit. However, since the foreign material may be in a space where a flux linkage is formed, the control method of the wireless charging system 10 according to the present invention may include detecting the foreign material before being switched from the ready to charge state to the charged state. Can.

Referring to FIG. 19, the control method of the wireless charging system 10 may include a standby step, a measurement step, and a control step.

The standby step is a step in which the control unit receives a signal for switching from a charging ready state to a charging state. It can be switched manually by the user's input, and when placed in the wireless power receiving device (200, 400) in close proximity to the wireless power transmitting device (100, 300), the wireless power receiving device (200, 400) It detects the state of charge of the battery, and the wireless power transmitters 100 and 300 may automatically switch to the state of charge according to the state of charge.

When the control unit receives a signal to switch, it cuts the current supplied to the transmission coil (Tx Coil) or supplies a small amount of current to the transmission coil (Tx Coil) while transmitting the transmission coil (Tx Coil) or the reception coil ( Rx Coil) to measure the inductance or impedance.

Then, the control unit executes the control step. The control unit compares whether the measured inductance or impedance value is within a predetermined range, cuts off the current supplied to the transmission coil (Tx Coil) if it is outside the preset range, and switches the wireless power transmitters (100, 300). Wait for charging. However, if it does not exceed a predetermined range, the control unit switches the wireless power transmitters 100 and 300 to a charging state that supplies current to the transmission coil (Tx Coil) so that wireless power is transmitted. At this time, the control step may further include an output step, the control unit may output a signal for notifying the occurrence of an event to the alarm unit when the measured value of the inductance or impedance is outside a predetermined range.

As described above, the control unit cuts off the current supplied to the transmission coil (Tx Coil) or supplies a small amount of current to the transmission coil (Tx Coil) in the ready state for charging before the wireless power is transmitted, and transmits it through the sensing unit The inductance or impedance of the coil (Tx Coil) can be measured.

20 is a flowchart illustrating an example of a control method of the wireless charging system 10 in a charging state.

In the charged state, foreign substances may be introduced into the space where the flux linkage is formed. Therefore, the control method of the wireless charging system 10 according to the present invention includes the step of sensing foreign substances in a charged state.

20, the control method of the wireless charging system 10 according to the present invention may include a measurement step and a control step.

In the measurement step, the control unit cuts off the current supplied to the transmission coil (Tx Coil) at a predetermined cycle or supplies a small amount of current to the transmission coil (Tx Coil), and transmits the transmission coil (Tx Coil) or the reception coil (Rx) through the sensing unit. Coil) inductance or impedance.

And, compares whether the measured value of the inductance or impedance is within a predetermined range, cuts the current supplied to the transmission coil (Tx Coil) outside the predetermined range, and the wireless power transmitter (100, 300) Wait for charging. However, if it does not exceed a predetermined range, the controller maintains a charging state in which the wireless power transmitters 100 and 300 supply current to the transmission coil (Tx Coil) so that wireless power is transmitted. At this time, the control step may further include an output step, the control unit may output a signal for notifying the occurrence of an event to the alarm unit when the measured value of the inductance or impedance is outside a predetermined range.

As described above, the controller blocks the current supplied to the transmission coil (Tx Coil) at a predetermined period or charges a small amount of current to the transmission coil (Tx Coil) while charging the wireless power. The inductance or impedance of the transmission coil (Tx Coil) may be measured through the unit.

According to the hardware implementation, the methods described so far include application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors ( It can be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and electrical units for performing other functions. It may be implemented in the control unit 180 of the power transmission device 100 or the power transmission control unit 112.

According to the software implementation, embodiments such as procedures and functions described herein may be implemented as separate software modules. Each of the software modules may perform one or more functions and operations described herein. Software code can be implemented in a software application written in an appropriate programming language. The software code is stored in the memory 150 of the wireless power transmitter 100 and may be executed by the controller 180 or the power transmitter controller 112.

The configuration of the wireless power transmission device according to the embodiment disclosed in the present disclosure disclosed above is also applicable to devices such as a docking station, a terminal cradle device, and other electronic devices, except when applicable only to a wireless charger. It will be readily apparent to those skilled in the art that this is possible.

The scope of the present invention is not limited to the embodiments disclosed herein, and the present invention can be modified, changed, or improved in various forms within the scope described in the spirit and claims of the present invention.

100: wireless power transmitter 200: wireless power receiver

Claims (17)

A coil unit formed to transmit wireless power; And,
When the signal sensed by the coil unit is outside a predetermined inductance or impedance range, it is determined that foreign material has been introduced into the power transmission space formed between the coil unit and the wireless power receiving device receiving the wireless power. It includes a control unit formed to control the current supplied as a part,
The predetermined inductance or impedance range,
In the state in which the current supplied to the coil part is cut off, it is a range according to a difference in inductance or impedance value when there is or is not a foreign substance in the power transmission space,
The control unit,
In a state in which the current supplied to the coil part is cut off, it is determined whether the inductance or impedance measured by the coil part is outside the preset inductance or impedance range,
It is formed to adjust the current supplied to the coil unit according to the sensed data transmitted from the wireless power receiving device for receiving the wireless power,
The detection data,
A wireless power transmission device characterized in that the inductance or impedance sensed by the wireless power reception device is transmitted from the wireless power reception device to the control unit when it is out of a preset range. According to claim 1,
(The wireless power transmission device) is a wireless power transmission device characterized in that it further comprises a detection unit formed to sense the inductance or impedance change of the transmission coil provided in the coil unit. According to claim 2,
The control unit,
Wireless power transmission device, characterized in that in the ready state of charge before the wireless power is transmitted, cut off the current supplied to the transmission coil, and measure the inductance or impedance of the transmission coil through the sensing unit. According to claim 2,
The control unit,
In a state of preparation for charging before the wireless power is transmitted, a small amount of current is supplied to the transmitting coil, and the inductance or impedance of the transmitting coil is measured through the sensing unit,
The trace current is,
Wireless power transmission device characterized in that the current within 10 ~ 50mA. According to claim 2,
The control unit,
In a charging state in which wireless power is transmitted, a wireless power transmission device characterized in that measuring the inductance or impedance of the transmission coil through the sensing unit while blocking the current supplied to the transmission coil at a predetermined period. According to claim 2,
The control unit,
In a charging state in which wireless power is transmitted, while supplying a small amount of current to the transmission coil at a predetermined cycle, a wireless power transmission device characterized in that it measures the inductance or impedance of the transmission coil through the sensing unit. According to claim 1,
The wireless power transmission device further includes an alarm unit for outputting a signal for notifying the occurrence of an event,
The control unit,
Wireless power transmission device, characterized in that for outputting a predetermined signal through the alarm unit before adjusting the current supplied to the coil unit. A transmission device having a first coil unit and a transmission communication unit, and configured to transmit wireless power;
A receiving device having a second coil part and a receiving communication part, and configured to receive wireless power from the transmitting device; And,
A transmission control unit embedded in the transmission device and configured to adjust a current supplied to the first coil unit according to whether external materials enter the power transmission space in which the flux linkage is formed by the coil units;
It includes; a receiving control unit for determining whether the signal sensed from the second coil unit is outside a predetermined inductance or impedance, and transmitting the determination result to the transmitting communication unit through the receiving communication unit.
The predetermined inductance or impedance range,
In the state in which the current supplied to the first coil part is cut off, it is a range according to the difference in inductance or impedance value when there is and without foreign material in the power transmission space,
The transmission control unit,
In the state in which the current supply to the first coil part is cut off, foreign substances flow into the power transmission space formed between the first coil part and the second coil part, based on the determination result received through the transmission communication part. Wireless charging system, characterized in that to determine whether or not to adjust the current supplied to the first coil unit according to the determination result. delete delete delete delete delete In the control method of the wireless charging system including a wireless power transmission device and a wireless power receiving device to block the current supplied to the transmission coil for transmitting wireless power or a predetermined fine current to the transmission coil,
Blocking step of the wireless power transmission device, to block the current supplied to the transmission coil for transmitting wireless power or to supply a predetermined fine current to the transmission coil;
A measurement step of the wireless power receiving device measuring an inductance or impedance of the transmitting coil or the receiving coil before the wireless power is transmitted through the sensing unit;
Comparing, by the wireless power receiving apparatus, whether the measured value of inductance or impedance is within a preset range;
Transmitting, by the wireless power receiving device, the sensed data to the wireless power transmitting device when the measured inductance or impedance value is outside a preset range; And,
The wireless power transmission apparatus that has received the detection data cuts the current supplied to the transmission coil based on the detection data and waits for charging, or transmits the wireless power to the transmission coil so that the wireless power is transmitted. It includes a control step of switching to a charging state that supplies a current for the
The fine current,
10~50mA or less,
The preset range occurs when the current supplied to the transmission coil is cut off or when the fine current is supplied, when there is or is not a foreign substance in the power transmission space formed between the transmission coil and the reception coil. Control method of a wireless charging system, characterized in that the range according to the difference in inductance or impedance value. delete delete delete

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