KR20170142678A - A wireless power transmitter and a wireless power receiver - Google Patents

Abstract

A wireless power receiver comprises: a sensor to detect the wireless power receiver; a plurality of receiving coils to receive an alternating current from a transmitting coil of a wireless power transmitter; a converter to convert the alternating current power into a direct current; a battery charged by the direct current; and a controller to use the sensor to sense a size of the transmitting coil and select at least one coil among the plurality of receiving coils based on the sensed size. The sensor may be one among a geomagnetic sensor and a digital compass.

Description

[0001] A WIRELESS POWER TRANSMITTER AND A WIRELESS POWER RECEIVER [0002]

The present invention relates to a wireless power transmitter and a wireless power receiver.

2. Description of the Related Art Generally, various electronic apparatuses are equipped with a battery and are driven by using electric power charged in the battery. At this time, in the electronic device, the battery can be replaced and recharged again. To this end, the electronic device has a contact terminal for contact with an external charging device. That is, the electronic device is electrically connected to the charging device through the contact terminal. However, as the contact terminal is exposed to the outside in the electronic device, it may be contaminated by foreign substances or short-circuited by moisture. In this case, there is a problem that a contact failure occurs between the contact terminal and the charging device, and the battery is not charged by the electronic device.

In order to solve the above problems, a wireless power transfer (WPT) for charging an electronic device wirelessly has been proposed. The wireless power transmission system is a technology that transfers power without a line through space and maximizes the convenience of power supply to mobile devices and digital home appliances. The wireless power transmission system has advantages such as saving energy through real-time power usage control, overcoming space limit of power supply, and reducing waste battery discharge by battery recharging.

As a method of implementing a wireless power transmission system, there are typically a magnetic induction type and a self resonance type. The magnetic induction method is a noncontact energy transmission technique in which two coils are brought close to each other, a current is supplied to one coil, and an electromotive force is generated in the other coil via the magnetic flux generated thereby. The self-resonance method is a magnetic resonance technique that uses only electric fields or magnetic fields without using electromagnetic waves or currents, and the distance capable of power transmission is several meters or more, and a band of several MHz can be used.

The wireless power transmission system includes a transmitting device that transmits power wirelessly and a receiving device that receives power to charge a load such as a battery. At this time, a charging method of a receiving apparatus, that is, a charging method of either a magnetic induction method or a self-resonance method can be adopted, and a transmitting apparatus capable of transmitting power wirelessly corresponding to a charging method of a receiving apparatus has been developed.

A wireless power transmitter having a plurality of transmit coils according to an embodiment of the present invention detects the size of a receive coil of a wireless power receiver using a geomagnetic sensor or a digital compass and, based on the detection result, One of the transmission coils is selected.

A wireless power receiver having a plurality of receiving coils according to an embodiment of the present invention detects the size of a transmitting coil of a wireless power transmitter using a geomagnetic sensor or a digital compass and, based on the detection result, One of the receiving coils is selected.

A wireless power receiver according to an embodiment of the present invention includes: a sensor (seosor) for detecting the wireless power receiver; A plurality of receiving coils for receiving an alternating current from a transmitting coil of a wireless power transmitter; A converter for converting the AC power into a DC current; A battery charged with the direct current; And a controller for sensing the size of the transmitting coil using the sensor and for selecting at least one coil of the plurality of receiving coils based on the sensed magnitude, wherein the sensor is a geomagnetic sensor Or a digital compass.

A wireless power transmitter according to an embodiment of the present invention includes: a sensor (seosor) for detecting the wireless power receiver; A power converter for converting AC power received from a power source into transmission power; A plurality of transmit coils transmitting the transmit power to a receive coil of the wireless power receiver; And a controller for sensing the size of the receiving coil using the sensor and selecting at least one coil of the plurality of transmitting coils based on the sensed size, wherein the sensor is a geomagnetic sensor or Or a digital compass.

A method of operating a wireless power transmitter in accordance with an embodiment of the present invention includes: detecting at least one wireless power receiver; Transmitting and receiving a setup signal for transmitting wireless power to the at least one wireless power receiver; Transmitting the wireless power to the at least one wireless power receiver; And terminating the wireless power transmission to the at least one wireless power receiver, wherein detecting the at least one wireless power receiver comprises: sensing the at least one wireless power < RTI ID = 0.0 > Wherein terminating the wireless power transmission comprises detecting a change in position of the wireless power transmitter or a change in position of the at least one wireless power receiver using the geomagnetic sensor of the wireless power transmitter And determining whether to terminate the wireless power transmission.

A method of operating a wireless power receiver in accordance with an embodiment of the present invention includes: detecting a wireless power transmitter; Transmitting and receiving a setup signal for receiving wireless power with the wireless power transmitter; Receiving the wireless power from the wireless power transmitter; And terminating the wireless power reception with the wireless power transmitter, wherein detecting the wireless power transmitter includes detecting the wireless power transmitter using a geomagnetic sensor of the wireless power receiver, Wherein terminating the wireless power reception comprises determining whether the wireless power reception is terminated by detecting a change in position of the wireless power receiver or a change in position of the wireless power transmitter using the geomagnetic sensor of the wireless power receiver .

A wireless power transmitter having a plurality of receiving coils according to an embodiment of the present invention detects a size of a transmitting coil of a wireless power transmitter and selects one receiving coil of the plurality of receiving coils based on the detection result And by receiving the wireless power, the wireless power receiving efficiency can be maximized.

A wireless power receiver having a plurality of receiving coils according to an embodiment of the present invention detects the size of a transmitting coil of a wireless power transmitter using a geomagnetic sensor or a digital compass and, based on the detection result, The receiving power of the wireless power can be maximized by selecting one of the receiving coils and receiving the wireless power.

The wireless power transmitter having a plurality of transmission coils according to an embodiment of the present invention can detect the size of the reception coil of the wireless power receiver by using the installed geomagnetic sensor or the digital compass without any additional device, It is possible to reduce the manufacturing cost of the apparatus.

A wireless power receiver having a plurality of transmit coils according to an embodiment of the present invention detects the size of a receive coil of a wireless power receiver using a pre-installed geomagnetic sensor or a digital compass without a separate additional device, It is possible to reduce the manufacturing cost of the apparatus.

A wireless power transmitter or receiver in accordance with embodiments of the present invention may not use a ping signal or a beacon to detect a receiver or transmitter by detecting a receiver or transmitter through a geomagnetism or digital compass, The power consumption can be reduced.

A wireless power transmitter or receiver in accordance with an embodiment of the present invention may detect the receiver or transmitter via a geomagnetism or digital compass, thereby avoiding impedance measurements to detect the receiver or transmitter and thereby reduce power consumption.

1 is a magnetic induction equivalent circuit.
2 is a self-resonant-type equivalent circuit.
3A and 3B are block diagrams showing a transmitting apparatus as one of the subsystems constituting a wireless power transmission system.
4A and 4B are block diagrams showing a receiver as one of the subsystems constituting the wireless power transmission system.
5 is a flowchart illustrating an operation of the wireless power transmission system, and is a flowchart illustrating the operation of the wireless power transmission apparatus.
6A to 6D are top views of a transmitting coil part or a receiving coil part according to an embodiment of the present invention.
7A to 7C are side views of a transmitting coil part and a receiving coil part according to an embodiment of the present invention.
8A to 8D are a top view and a side view of a transmitting coil part or a receiving coil part according to an embodiment of the present invention.
9A to 9D are top views of a transmitting coil part 1400 or a receiving coil part 2100 according to another embodiment of the present invention.
10A to 10C are side views of a transmitting coil part and a receiving coil part according to another embodiment of the present invention.
11A to 11C are apparatus diagrams of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.
FIG. 12 is a flow chart illustrating an operation procedure and a signal flow of a wireless power transmitter and receiver according to an embodiment of the present invention.
FIG. 13 is a flowchart illustrating an operation procedure and a signal flow of a wireless power transmitter and receiver according to another embodiment of the present invention.

Hereinafter, a wireless power transmission system including a transmitter having a function of transmitting power wirelessly and a receiver receiving power wirelessly according to an embodiment of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

Embodiments may include a communication system that selectively uses various types of frequency bands from a low frequency (50 kHz) to a high frequency (15 MHz) for wireless power transmission and can exchange data and control signals for system control .

The embodiments can be applied to various industrial fields such as a mobile terminal industry using a battery or an electronic device required, a smart clock industry, a computer and notebook industry, a household appliance industry, an electric car industry, a medical device industry, and a robot industry .

Embodiments may consider a system capable of power transmission to one or more multiple devices using one or more transmission coils.

According to the embodiment, it is possible to solve the battery shortage problem in a mobile device such as a smart phone and a notebook. For example, when a wireless charging pad is placed on a table and a smart phone or a notebook is used on the table, the battery is automatically charged and can be used for a long time . In addition, by installing wireless charging pads in public places such as cafes, airports, taxis, offices, restaurants, etc., mobile devices manufacturers can charge various mobile devices regardless of charging terminals. In addition, when wireless power transmission technology is applied to household electrical appliances such as cleaners, electric fans, etc., there is no need to look for power cables and complex wires can be eliminated in the home, which can reduce wiring in buildings and increase the space utilization. In addition, it takes a lot of time to charge the electric car with the current household power, but if the high power is transmitted through the wireless power transmission technology, the charging time can be reduced. If the wireless charging facility is installed at the bottom of the parking lot, It is possible to solve the inconvenience of having to prepare.

The terms and abbreviations used in the examples are as follows.

Wireless Power Transfer System: A system that provides wireless power transmission within a magnetic field region

Wireless Power Transfer System-Charger: A device that provides wireless power transmission to a power receiver within a magnetic field area and manages the entire system.

Wireless Power Transfer System-Device: A device that is provided with a wireless power transmission from a power transmitter within a magnetic field area.

Charging Area: A region where actual wireless power transmission occurs within the magnetic field region, and may vary depending on the size, required power, and operating frequency of the application product.

S parameter (Scattering parameter): S parameter is the ratio of input voltage to output voltage input port-output port, the ratio of the frequency distribution; in its reflectance value, i.e. their type of (Transmission S ₂₁₎ or each I / O port (Reflection (S ₁₁ , S ₂₂ )).

Quality factor Q: The value of Q in resonance means the quality of frequency selection. The higher the Q value, the better the resonance characteristics. The Q value is expressed as the ratio of the energy stored in the resonator to the energy lost.

The principles of wireless power transmission include magnetic induction and self-resonance.

The magnetic induction method is that the electromotive force to generate a source inductor (L _s) and a load inductor (L _ℓ) to the close proximity to each other the magnetic flux to the load inductor as a medium (L _ℓ) generated spill the current source inductor (L _s) of the one side Contact energy transfer technology. The self-resonance method combines two resonators to generate self-resonance by the natural frequency between the two resonators. By resonating at the same frequency and using the resonance technique to form an electric field and a magnetic field in the same wavelength range, Technology.

1 is a magnetic induction equivalent circuit.

1, in a magnetic induction equivalent circuit, a transmitter includes a source voltage V _s , a source resistance R _s , a source capacitor C _s for impedance matching, It may be implemented as a coupling source coil (L _s) for, receiving a load for the magnetic coupling of the load capacitors (C _ℓ) and the transmission unit for the load resistance (R _ℓ) equivalent resistance of the receiver, impedance matching magnetic coupling of the coils may be implemented in (L _ℓ), the source coil (L _s) and a load coil (L _ℓ) degree may be represented by a mutual inductance (M _sℓ).

In FIG. 1, the ratio (S ₂₁ ) of the input voltage to the output voltage is obtained from a magnetic induction equivalent circuit consisting solely of a coil without a source capacitor C _s and a load capacitor C _l for impedance matching, The maximum power transmission condition satisfies Equation (1) below.

Equation 1

L _s / R _s = L _ℓ / R _ℓ

Maximum power transmission is possible when the ratio of the inductance of the transmission coil L _s to the source resistance R _s and the ratio of the inductance of the load coil L _L to the load resistance R _L are equal to each other. Since there is no capacitor capable of compensating reactance in a system having only inductance, the value of the self reflection value (S ₁₁ ) of the input / output port can not be zero at the point where the maximum power transfer occurs, The power transmission efficiency may vary greatly depending on the value (M _s ). Thus, the source capacitor C _s can be added to the transmitter as a compensation capacitor for impedance matching, and the load capacitor C _l can be added to the receiver. The compensation capacitors C _s , C _l may be connected in series or in parallel to the receiving coil L _s and the load coil L _l , respectively, for example. For impedance matching, a passive element such as an additional capacitor and an inductor may be added to each of the transmitter and the receiver as well as the compensation capacitor.

2 is a self-resonant-type equivalent circuit.

2, in a self-resonant-type equivalent circuit, a transmitter includes a source coil constituting a closed circuit by a series connection of a source voltage V _s , a source resistance R _s and a source inductor L _s , side of the resonance inductor (L1) and is implemented in the transmission side resonance coil (resonant coil) constituting a closed circuit in series connection of the transmission side resonance capacitor (C1), receiving a load resistance (R _ℓ) and a load inductor (L _ℓ) Side resonant coil constituting a closed circuit by a series connection of a load coil constituting a closed circuit in series connection, a resonant inductor L2 on the reception side and a resonant capacitor C2 on the reception side, and the source inductor L _s And the transmission side resonance inductor L1 are magnetically coupled with the coupling coefficient of K01 and the load inductor L _? And the load side resonance inductor L2 are magnetically coupled with the coupling coefficient of K23, (L1) and the reception-side resonance inductor (L2) Channels are magnetically coupled. In the equivalent circuit of another embodiment, the source coil and / or the load coil may be omitted, and only the transmission-side resonance coil and the reception-side resonance coil may be formed.

When the two resonators have the same resonance frequency, most of the energy of the resonator of the transmitter is transmitted to the resonator of the receiver so that the power transfer efficiency can be improved, and the efficiency in the self resonance method satisfies Equation When it gets better.

Equation 2

k / Γ >> 1 (k is the coupling coefficient, Γ attenuation factor)

In order to increase the efficiency in the self-resonant mode, an element for impedance matching can be added, and the impedance matching element can be a passive element such as an inductor and a capacitor.

Based on such a wireless power transmission principle, a wireless power transmission system for transmitting power by a magnetic induction method or a self resonance method will be described.

<Transmitter>

FIGS. 3A and 3B are block diagrams showing a transmitter as one of subsystems configuring a wireless power transmission system.

Referring to FIG. 3A, a wireless power transmission system according to an embodiment of the present invention may include a transmitter 1000 and a receiver 2000 that receives power wirelessly from the transmitter 1000. FIG. The transmission unit 1000 includes a power conversion unit 101 for converting an input AC signal into an AC signal and outputting the AC signal as an AC signal, a transmission unit 101 for generating a magnetic field based on the AC signal output from the power conversion unit 101, The power conversion unit 101 and the power conversion unit 101. The resonance circuit unit 102 and the power conversion unit 101 are connected to the power conversion unit 101 and the power conversion unit 101, And a control unit 103 for sensing impedance, voltage and current information from the power conversion unit 101 and the resonant circuit unit 102 and wirelessly communicating with the receiving unit 2000 can do. The power conversion unit 101 may include at least one of a power conversion unit that converts an AC signal to DC, a power conversion unit that outputs a DC by varying the level of the DC, and a power conversion unit that converts DC into AC . The resonance circuit unit 102 may include a coil and an impedance matching unit capable of resonating with the coil. The control unit 103 may include a sensing unit and a wireless communication unit for sensing impedance, voltage, and current information.

 3B, the transmitting unit 1000 includes a transmitting side AC / DC converting unit 1100, a transmitting side DC / AC converting unit 1200, a transmitting side impedance matching unit 1300, a transmitting coil unit 1400 And a transmission side communication and control unit 1500. [

The transmitting side AC / DC converting unit 1100 is a power converting unit for converting an AC signal provided from the outside under the control of the transmitting side communication and control unit 1500 to a DC signal. The transmitting side AC / DC converting unit 1100 includes: May include a rectifier 1110 and a transmission side DC / DC converter 1120 as a subsystem. The rectifier 1110 converts a supplied AC signal into a DC signal. The rectifier 1110 may be a diode rectifier having a relatively high efficiency in high-frequency operation, a synchronous rectifier capable of one-chip operation, And a hybrid rectifier capable of saving space and having a high degree of freedom in dead time. However, the present invention is not limited to this, and can be applied to a system that converts AC to DC. The transmitting side DC / DC converting unit 1120 adjusts the level of the DC signal provided from the rectifier 1110 under the control of the transmitting side communication and control unit 1500. As an example of implementing the DC signal, A buck converter, a boost converter that boosts the level of the input signal, a buck-boost converter or a Cuk converter that can raise or lower the level of the input signal. Also, the transmission side DC / DC converter 1120 includes a switch element that performs a power conversion control function, an inductor and a capacitor that perform a power conversion medium function or an output voltage smoothing function, a voltage gain control function or an electrical isolation function (insulation function) And may have a function of removing a ripple component or a ripple component (AC component included in the DC signal) included in the input DC signal. The error between the command value of the output signal of the transmitting side DC / DC converting unit 1120 and the actual output value can be adjusted through the feedback method and can be performed by the transmitting side communication and control unit 1500 .

The transmission side DC / AC conversion unit 1200 converts the DC signal output from the transmission side AC / DC conversion unit 1100 into an AC signal under the control of the transmission side communication and control unit 1500 and outputs the converted AC signal frequency A half bridge inverter or a full bridge inverter is an example of implementing this system. In the wireless power transmission system, various amplifiers for converting direct current to alternating current can be applied. For example, class A, class B, class AB, class C, class E class F amplifier. The transmission side DC / AC conversion unit 1200 may include an oscillator for generating a frequency of an output signal and a power amplifier for amplifying an output signal.

The transmission-side impedance matching unit 1300 minimizes the reflected waves at points having different impedances to improve the signal flow. Since the two coils of the transmitting unit 1000 and the receiving unit 2000 are spatially separated and the leakage of the magnetic field is large, the impedance difference between the two connecting ends of the transmitting unit 1000 and the receiving unit 2000 is corrected, . The impedance matching unit 1300 may include an inductor, a capacitor, and a resistor. Under the control of the communication and control unit 1500, the inductance of the inductor, the capacitance of the capacitor, The impedance value can be adjusted. When the wireless power transmission system transmits power in a self-induction manner, the transmission-side impedance matching unit 1300 may have a series resonance structure or a parallel resonance structure, and may have an inductive coupling between the transmission unit 1000 and the reception unit 2000 The energy loss can be minimized by increasing the coefficient. When the wireless power transmission system transmits power in a self-resonant manner, the transmission-side impedance matching unit 1300 may change the separation distance between the transmission unit 1000 and the reception unit 2000, or may change a foreign object (FO) It is possible to perform real-time correction of the impedance matching according to the change of the matching impedance on the energy transmission line due to the change of the characteristics of the coil due to the mutual influence by the device of the capacitor, A matching method, a method using a multi-loop, and the like.

The transmitting coil 1400 may be implemented as a plurality of coils or a plurality of coils. If a plurality of transmitting coils 1400 are provided, they may be spaced apart from each other, The overlapping area can be determined in consideration of the deviation of the magnetic flux density. Also, when the transmission coil 1400 is manufactured, it can be manufactured in consideration of the internal resistance and the radiation resistance. If the resistance component is small, the quality factor can be increased and the transmission efficiency can be increased.

The communication and control unit 1500 may include a transmission side control unit 1510 and a transmission side communication unit 1520. The transmission-side controller 1510 may control the output voltage of the transmission-side AC / DC converter 1100 in consideration of the power demand of the receiver 2000, the current charge amount, and the wireless power scheme. The frequency and switching waveforms for driving the transmission side DC / AC conversion unit 1200 may be generated in consideration of the maximum power transmission efficiency to control power to be transmitted. Also, the overall operation of the receiver 2000 can be controlled by using an algorithm, a program, or an application required for the control read from the storage unit (not shown) of the receiver 2000. Meanwhile, the transmission-side controller 1510 may be referred to as a microprocessor, a microcontroller unit, or a microcomputer. The transmission-side communication unit 1520 can perform communication with the reception-side communication unit 2620, and can use a short-distance communication scheme such as Bluetooth, NFC, Zigbee, etc. as a communication scheme. The transmission side communication unit 1520 and the reception side communication unit 2620 can transmit and receive the charging status information and the charging control command to each other. The charging status information may include the number of the receiving unit 2000, the remaining battery level, the number of times of charging, the amount of usage, the battery capacity, the battery ratio, and the transmission power amount of the transmission unit 1000. Side communication unit 1520 can transmit a charging function control signal for controlling the charging function of the receiving unit 2000 and the charging function control signal controls the receiving unit 2000 to enable or disable the charging function And may be a control signal for disabling the control signal.

As described above, the transmitting-side communication unit 1520 may be communicated in an out-of-band format, which is a separate module, but the present invention is not limited thereto. And may perform communication in an in-band format using a feedback signal to be transmitted to a transmitter. For example, the receiver may modulate the feedback signal to transmit information such as start of charge, end of charge, battery condition, etc. to the transmitter through a feedback signal. The transmission side communication unit 1520 may be configured separately from the transmission side control unit 1510 and the reception side communication unit 2620 may be included in the control unit 2610 of the reception device or separately have.

In addition, the transmission unit 1000 of the wireless power transmission system according to the embodiment may further include a detection unit 107.

The detection unit 107 detects an input signal of the transmitting side AC / DC converting unit 1100, an output signal of the transmitting side AC / DC converting unit 1100, an input signal of the transmitting side DC / AC converting unit 1200, The input signal of the transmission side impedance matching unit 1300, the output signal of the transmission side impedance matching unit 1300, the input signal of the transmission side coil 1400, or the transmission side coil 1400). &Lt; / RTI &gt; The detected signal is fed back to the communication and control unit 1500 and the communication and control unit 1500 controls the transmission side AC / DC conversion unit 1100, the transmission side DC / AC conversion unit 1200, the transmission side impedance matching The control unit 1300 can be controlled. Also, the communication and control unit 1500 can perform a foreign object detection (FOD) based on the detection result of the detection unit 1600. And the detected signal may be at least one of a voltage and a current. On the other hand, the detection unit 107 may be configured by hardware different from the communication and control unit 1500, or may be implemented by one hardware.

4A and 4B are block diagrams illustrating a wireless power receiving apparatus as one of subsystems constituting a wireless power transmission system.

In accordance with an embodiment of the present invention, the wireless power receiving apparatus 2000 may be referred to as a wireless power receiver or receiver or receiver.

4A, a wireless power transmission system according to an exemplary embodiment of the present invention may include a transmitting apparatus 1000 and a receiving apparatus 2000 receiving power wirelessly from a transmitting apparatus 1000. FIG. The receiving apparatus 2000 includes a receiving-side resonant circuit section 201 for receiving an AC signal transmitted from the transmitting apparatus 1000, a receiving-side power circuit for converting AC power from the receiving-side resonant circuit section 201 into a DC signal, A load 2500 to be charged by receiving the DC signal outputted from the converting unit 202 and the receiving side power converting unit 202 and the current voltage of the receiving side resonant circuit unit 201 or the receiving side resonant circuit unit 201 Or adjusts the level of the output signal of the receiving-side power converting section 202 or controls the output power of the receiving-side power converting section 202 by controlling the power conversion of the receiving-side power converting section 202, Side control unit 203 that can sense the output voltage or current, control whether the output signal of the reception-side power conversion unit 202 is supplied to the load 2500, or communicate with the transmission device 1000 can do. The receiving-side power converting section 202 may include a power converting section for converting the AC signal into DC, a power converting section for varying the level of the DC to output the DC, and a power converting section for converting the DC to AC.

4B, the wireless power transmission system may include a transmitter 1000 and a receiver 2000 that receives power wirelessly from the transmitter 1000. The receiver 2000 includes a receiver coil 2100 A receiving side AC / DC converting unit 2300, a DC / DC converting unit 2400, a load 2500, and a receiving side communication and controlling unit 2600. The receiving side AC / DC converting unit 2300 includes a receiving side impedance matching unit 2200,

The receiving side coil part 2100 can receive power through a magnetic induction method or a self resonance method. As described above, at least one of the induction coil and the resonance coil may be included according to the power reception scheme. The receiving side coil part 2100 may be equipped with a near field communication (NFC) antenna. The receiving side coil part 2100 may be the same as the transmitting side coil part 1400 and the dimensions of the receiving antenna may be changed according to the electrical characteristics of the receiving part 200. [

The receiving-side impedance matching unit 2200 performs impedance matching between the transmitter 1000 and the receiver 2000.

The receiving-side AC / DC converter 2300 rectifies an AC signal output from the receiving-side coil part 2100 to generate a DC signal.

The receiving-side DC / DC converting section 2400 can adjust the level of the DC signal output from the receiving-side AC / DC converting section 2300 to the capacity of the load 2500.

The load 2500 may include a battery, a display, a voice output circuit, a main processor, and various sensors.

The receiving side communication and control unit 2600 can be activated by the wake-up power from the transmitting side communication and control unit 1500 and performs communication with the transmitting side communication and control unit 1500, The operation of the system can be controlled.

The receiving unit 2000 includes a single or a plurality of receiving units 2000, and can simultaneously receive energy from the transmitting unit 1000 wirelessly. That is, in the self-resonant wireless power transmission system, a plurality of target receivers 2000 can receive power from one transmitter 1000. At this time, the transmitter matching unit 1300 of the transmitter 1000 may adaptively perform impedance matching between the plurality of receivers 2000. This can be equally applied to a case where a plurality of reception side coil portions independent from each other in the magnetic induction system are provided.

When the receiving unit 2000 includes a plurality of units, the power receiving systems may be the same system or different types of systems. In this case, the transmitting unit 1000 may be a system for transmitting power by a magnetic induction system or a self-resonance system, or a system for mixing both systems.

Meanwhile, in the case of a wireless power transmission of a magnetic induction type, the transmission side AC / DC conversion unit 1100 in the transmission unit 1000 may transmit power of several tens or several hundreds V (for example, (For example, 10 V to 20 V) and can output a DC signal of several V to several tens V and several hundred V (for example, 10 V to 20 V) by receiving an AC signal of several tens or several hundred Hz Side DC / AC converting unit 1200 can receive an AC signal and output an AC signal of KHz band (for example, 125 KHz). The receiving AC / DC converting unit 2300 of the receiving unit 2000 receives AC signals of KHz band (for example, 125KHz) and receives DC signals of several V to several tens V, several hundred V (for example, 10V to 20V) And the receiving side DC / DC converting section 2400 can output a DC signal of, for example, 5V suitable for the load 2500 and transmit the DC signal to the load 2500. In the case of the wireless power transmission of the self-resonance type, the transmitting side AC / DC converting unit 1100 in the transmitting unit 1000 may transmit power of several tens or several hundreds Hz (for example, 110 V to 220 V) And the transmission side DC / AC conversion unit 1200 converts the DC signal into a DC signal of several V to several tens V and several hundred V (for example, 10V to 20V) And can output an AC signal of MHz band (for example, 6.78 MHz). The receiving AC / DC converting unit 2300 of the receiving unit 2000 receives AC signals of MHz (for example, 6.78 MHz) and receives AC signals of several V to several tens V, several hundred V (for example, 10 V to 20 V) DC converter 2400 can output a DC signal of, for example, 5V suitable for the load 2500 and transmit it to the load 2500. The DC /

&Lt; Operation state of the transmitter &

5 is a flowchart illustrating an operation of the wireless power transmission system, and is a flowchart illustrating an operation of the wireless power transmission system.

5, a transmitter according to an embodiment may have at least 1) a standby state, 2) a digital ping state, 3) an authentication state, 4) a power transmission state, and 5) a charge end state.

[Standby]

(1) When the transmitter 1000 is powered from the outside and the transmitter 1000 is started, the transmitter 1000 may be in a standby state. The transmitting unit 1000 in the standby state can detect the presence of an object (for example, the receiving unit 2000 or metallic foreign matter FO) disposed in the charging area. Also, the transmitter 1000 can detect whether or not the object is removed from the charging area.

(2) As a method of detecting the presence of an object in the charging area, the transmitter 1000 may monitor the object by monitoring the change of the magnetic flux, the change in capacitance or inductance between the object and the transmitter 1000, But is not limited thereto.

(3) If the transmitter 1000 detects an object that is the receiver 2000 in the charging area, the digital ping state can be shifted to the next step.

(4) The transmitter 1000 can detect the FO such as metallic foreign matter in the charged area.

(5) On the other hand, if the transmitter 1000 does not acquire enough information to distinguish between the receiver 2000 and the FO in the waiting state, the receiver goes to the digital ping state or goes to the authentication state, .

[Digital ping]

(1) In the digital ping state, the transmission unit 1000 is connected to the chargeable reception unit 2000, and confirms that it is an effective reception unit 2000 that can be charged with radio power provided from the transmission unit 1000. [ The transmission unit 1000 may generate and output a digital ping having a predetermined frequency and timing to be connected to the chargeable reception unit 2000.

(2) If a sufficient power signal for digital ping is transmitted to the receiving unit 2000, the receiving unit 2000 can respond to the digital ping by modulating the power signal according to a communication protocol. If the transmitting unit 1000 receives a valid signal from the receiving unit 2000, the receiving unit 2000 can proceed to the authentication state without removing the power signal. If the EOC request is received from the receiving unit 2000, the transmitting unit 1000 may proceed to the charging end state.

(3) When the effective receiving unit 2000 is not detected or the response time of the object for the digital ping exceeds a preset time, the transmitting unit 1000 can return to the standby state by removing the power signal. Therefore, if the FO is placed in the charging area, the transmitter 1000 can return to the standby state because the FO can not make any response.

[Identification]

(1) When the response of the receiving unit 2000 according to the digital ping of the transmitting unit 1000 is completed, the transmitting unit 1000 transmits the transmitting unit authentication information to the receiving unit 2000 to check compatibility between the transmitting and receiving units 1000 and 2000 . When the compatibility is confirmed, the receiving unit 2000 can transmit the authentication information to the transmitting unit 1000. [ The transmitting unit 1000 can confirm the receiving unit authentication information of the receiving unit 2000.

(2) When the mutual authentication is completed, the transmitter 1000 proceeds to the power transmission state. If the authentication fails, or the authentication time exceeds the predetermined authentication time, the transmitter 1000 can return to the standby state.

[Power Transfer State]

(1) The communication and control unit 1500 of the transmission unit 1000 can provide charging power to the reception unit 2000 by controlling the transmission unit 1000 based on the control data provided from the reception unit 2000.

(2) Further, the transmitter 1000 can verify that the proper operation range is not exceeded or that the stability according to the FOD is not problematic.

(3) If the transmitter 1000 receives a charge completion signal from the receiver 2000 or if it exceeds the preset limit temperature, the transmitter 1000 can stop the power transmission and proceed to the charging completion state .

(4) In the case of a situation where the power is not suitable for transmission, the power signal can be removed and returned to the standby state. If the receiving unit 2000 enters the charging area again after the receiving unit 2000 is removed, the above-described cycle can be performed again.

(5) It is also possible to return to the authenticated state in accordance with the charged state of the load 2500 of the receiving unit 2000, and to provide the adjusted charging power to the receiving unit 2000 based on the state information of the load 2500.

[End of Charge (EOC))

(1) The transmitter 1000 can receive the information that the charging is completed from the receiver 2000 or can go to the charging completion state when receiving information that the receiver 2000 has risen above a predetermined temperature.

(2) When the transmitting unit 1000 receives the charging completion information from the receiving unit 2000, the transmitting unit can stop the power transmission and wait for a predetermined time. After a predetermined time has elapsed, the transmitter 1000 may enter the digital ping state to be connected to the receiver 2000 disposed in the charging area.

(3) When the transmitter 1000 receives information that the preset temperature has been exceeded from the receiver 2000, it can wait for a predetermined time. After a predetermined time elapses, the transmitter 1000 may enter the digital ping state to be connected to the receiver 2000 disposed in the charge area.

(4) The transmitter 1000 can monitor whether the receiver 2000 is removed from the charging area for a predetermined time, and can return to the standby state when the receiver 2000 is removed from the charging area.

6A to 6D are top views of a transmitting coil part or a receiving coil part according to an embodiment of the present invention.

Referring to FIG. 6A, the transmitting coil section 1400 includes a plurality of transmitting coils 1410, 1420, 1430, and 1440. The plurality of transmit coils 1410, 1420, 1430 and 1440 may be circular. For example, a first transmission coil 1410 is disposed at the center of the transmission coil section 1400. The transmit coil section 1400 includes a second transmit coil 1420 that surrounds the first transmit coil 1410. The transmit coil portion 1400 includes a third transmit coil 1430 that surrounds the second transmit coil 1420. The transmitting coil section 1400 includes a fourth transmitting coil 1440 surrounding the third transmitting coil 1430. According to an embodiment of the present invention, the plurality of transmission coils 1410, 1420, 1430 and 1440 are electrically connected.

According to another embodiment of the present invention, the transmit coil section 1400 may include a switch for controlling the electrical connection to the connection section of each of the plurality of transmit coils 1410, 1420, 1430 and 1440, respectively.

The receiving coil section 2100 includes a plurality of receiving coils 2110, 2120, 2130 and 2140. For example, a first receiving coil 2110 is disposed at the center of the receiving coil section 2100. The receiving coil portion 2100 includes a second receiving coil 2120 surrounding the first receiving coil 2110. The receiving coil portion 2100 includes a third receiving coil 2130 surrounding the second receiving coil 2120. The receiving coil section 2100 includes a fourth receiving coil 2140 surrounding the third receiving coil 2130. According to an embodiment of the present invention, the plurality of reception coils 2110, 2120, 2130, and 2140 are electrically connected.

According to another embodiment of the present invention, the receiving coil section 2100 may include a switch for controlling an electrical connection to a connecting portion of each of the plurality of receiving coils 2110, 2120, 2130 and 2140, respectively.

6B, the plurality of transmit coils 1410, 1420, 1430, and 1440 may be square. In addition, the plurality of receiving coils 2110, 2120, 2130, and 2140 may be square.

Referring to FIG. 6C, the plurality of transmit coils 1410, 1420, 1430, and 1440 may be horizontally long rectangles. Also, the plurality of receiving coils 2110, 2120, 2130, and 2140 may be horizontally long rectangular.

6D, the plurality of transmit coils 1410, 1420, 1430, and 1440 may be vertically long rectangles. Also, the plurality of receiving coils 2110, 2120, 2130, and 2140 may be vertically long rectangles.

7A to 7C are side views of a transmitting coil part and a receiving coil part according to an embodiment of the present invention.

Referring to FIG. 7A, a plurality of transmission coils 1410, 1420, 1430, and 1440 of the transmission coil section 1400 are arranged horizontally on the same single plane. At this time, the receiving coil part 2100 may be composed of one receiving coil.

Referring to FIG. 7B, the plurality of receiving coils 2110, 2120, 2130 and 2140 of the receiving coil part 2100 are arranged in the horizontal direction on the same one side. At this time, the transmitting coil part 1400 may be composed of one receiving coil.

Referring to FIG. 7C, the plurality of transmitting coils 1410, 1420, 1430 and 1440 of the transmitting coil part 1400 are arranged in the horizontal direction on the same one side. Further, the plurality of receiving coils 2110, 2120, 2130, and 2140 of the receiving coil part 2100 are arranged in the horizontal direction on the same one side.

8A to 8D are a top view and a side view of a transmitting coil part or a receiving coil part according to an embodiment of the present invention.

Referring to FIG. 8A, the transmission coil section 1400 according to the embodiment of the present invention includes a plurality of transmission coils 1410 and 1420 of different sizes. For example, the transmit coil section 1400 includes a first transmit coil 1410 and a second transmit coil 1420 in a circular form. At this time, the size of the first transmission coil 1410 may be smaller than that of the second transmission coil 1420. The transmit coil section 1400 includes a printed circuit board 1450 disposed between the plurality of transmit coils 1410 and 1420. The size of the printed circuit board 1450 may exceed the size of the plurality of transmit coils 1410 and 1420. In accordance with another embodiment of the present invention, the plurality of transmit coils 1410 and 1420 may be arranged to be stacked vertically on one side of the printed circuit board 1450.

Referring to FIG. 8A, the receiving coil section 2100 according to the embodiment of the present invention includes a plurality of receiving coils 2110 and 2120 of different sizes. For example, the receiving coil section 2100 includes a first receiving coil 2110 and a second receiving coil 2120 in a circular form. At this time, the size of the first receiving coil 2110 may be smaller than that of the second receiving coil 2120. The receiving coil section 2100 includes a printed circuit board 2150 disposed between the plurality of receiving coils 2110 and 2120. The size of the printed circuit board 2150 may exceed the size of the plurality of receiving coils 2110 and 2120.

8B, according to another embodiment of the present invention, the plurality of transmit coils 1410 and 1420 may be rectangular. In addition, the plurality of receiving coils 2110 and 2120 may be rectangular.

9A to 9D are top views of a transmitting coil part 1400 or a receiving coil part 2100 according to another embodiment of the present invention.

9A to 9D, a transmitting coil section 1400 according to another embodiment of the present invention includes a plurality of transmitting coils 1410 and 1420 having different sizes and different shapes. Similarly, the receiving coil section 2100 includes a plurality of receiving coils 2110 and 2120 of different sizes and different shapes.

For example, referring to FIG. 9A, the transmitting coil section 1400 includes a first transmitting coil 1410 having a long rectangular shape and a second transmitting coil 1420 having a long rectangular shape. In addition, the receiving coil section 2100 includes a first receiving coil 2110 having a long rectangular shape and a second receiving coil 2120 having a long rectangular shape.

9B, the transmitting coil section 1400 includes a first transmitting coil 1410 having a circular shape and a second transmitting coil 1420 having a rectangular shape. The diameter of the second transmission coil 1420 may exceed the length of one side of the first transmission coil 1410. According to another embodiment of the present invention, the diameter of the second transmission coil 1420 may be less than the length of one side of the first transmission coil 1410.

In addition, the receiving coil section 2100 includes a first receiving coil 2110 having a circular shape and a second receiving coil 2120 having a rectangular shape. The diameter of the second receiving coil 2120 may exceed the length of one side of the first receiving coil 2110. According to another embodiment of the present invention, the diameter of the second receiving coil 2120 may be less than the length of one side of the first receiving coil 2110.

9C, the transmitting coil section 1400 includes a first transmitting coil 1410 having a circular shape, a second transmitting coil 1420 having a long rectangular shape, and a third transmitting coil 1430 having a vertically long rectangular shape. The receiving coil section 2100 includes a first receiving coil 2110 of a circular shape, a second receiving coil 2120 of a laterally long rectangular shape, and a third receiving coil 2130 of a vertically long rectangular shape. According to another embodiment of the present invention, the sizes of the plurality of transmission coils 1410, 1420 and 1430 may be varied. Also, the sizes of the plurality of receiving coils 2110, 2120, and 2130 may be different.

10A to 10C are side views of a transmitting coil part and a receiving coil part according to another embodiment of the present invention.

Referring to FIG. 10A, in an embodiment of the present invention, the transmit coil section 1400 includes a plurality of transmit coils 1410, 1420, 1430 and 1440. At this time, the receiving coil part 2100 may be composed of one coil. According to another embodiment of the present invention, the shape, size, and arrangement order of the plurality of transmission coils 1410, 1420, 1430, and 1440 may be changed.

Referring to FIG. 10B, in an embodiment of the present invention, the receiving coil section 2100 includes a plurality of receiving coils 2110, 2120, 2130 and 2140. At this time, the transmitting coil part 1400 may be composed of one coil. According to another embodiment of the present invention, the shape, size, and arrangement order of the plurality of reception coils 2110, 2120, 2130, and 2140 may be changed.

Referring to FIG. 10C, in an embodiment of the present invention, the transmit coil section 1400 includes a plurality of transmit coils 1410, 1420, 1430 and 1440. In addition, the receiving coil section 2100 includes a plurality of receiving coils 2110, 2120, 2130 and 2140. According to another embodiment of the present invention, the shape, size, and arrangement order of the plurality of transmission coils 1410, 1420, 1430, and 1440 may be changed. Also, the shape, size, and arrangement order of the plurality of reception coils 2110, 2120, 2130, and 2140 may be different.

11A to 11C are apparatus diagrams of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

Referring to FIG. 11A, a wireless power transmitter 1000 may include a plurality of transmit coils 1400, a control and communication unit 1500, and a geomagnetic sensor 1600. The wireless power receiver 2000 may include a receive coil 2100. The wireless power transmitter 1000 can sense the size of the wireless power receiver 2000 and the receiving coil 2100 using the geomagnetic sensor 1600. [ The wireless power transmitter 1000 can select one of the plurality of transmission coils 1400 through the control and communication unit 1500 based on the result of sensing by the geomagnetic sensor 1600. [

According to another embodiment of the present invention, the wireless power transmitter 1000 may be a wireless communication terminal. For example, the wireless power transmitter 1000 may be a smart phone, a cellular phone, or a smart pad. At this time, the wireless power transmitter 1000 may further include a communication circuit (not shown) for communicating with the base station.

Referring to FIG. 11B, the wireless power receiver 2000 may include a plurality of receiving coils 2100, a control and communication unit 2600, and a geomagnetic sensor 2700. The wireless power transmitter 1000 may include a transmit coil 1400. The wireless power receiver 2000 can sense the size of the wireless power transmitter 1000 and the transmit coil 1400 using the geomagnetic sensor 2700. [ The wireless power receiver 2000 can select one of the plurality of receiving coils 2100 through the control and communication unit 2600 based on the result of sensing by the geomagnetic sensor 2700. [

According to another embodiment of the present invention, the wireless power receiver 2000 may be a wireless communication terminal. For example, the wireless power receiver 2000 may be a smart phone, a cellular phone, or a smart pad. At this time, the wireless power receiver 2000 may further include a communication circuit (not shown) for communicating with the base station.

Referring to FIG. 11C, the wireless power transmitter 1000 may include a plurality of transmit coils 1400, a control and communication unit 1500, and a geomagnetic sensor 1600. The wireless power receiver 2000 may include a receive coil 2100. In addition, the wireless power receiver 2000 may include a plurality of receive coils 2100, a control and communication unit 2600, and a geomagnetic sensor 2700. The wireless power transmitter 1000 may include a transmit coil 1400.

 The wireless power transmitter 1000 can sense the size of the receiving coil 2100 using the geomagnetic sensor 1600. [ The wireless power transmitter 1000 can select one of the plurality of transmission coils 1400 through the control and communication unit 1500 based on the result of sensing by the geomagnetic sensor 1600. [ In addition, the wireless power receiver 2000 can sense the size of the transmit coil 1400 using the geomagnetic sensor 2700. The wireless power receiver 2000 can select one of the plurality of receiving coils 2100 through the control and communication unit 2600 based on the result of sensing by the geomagnetic sensor 2700. [

According to another embodiment of the present invention, the wireless power transmitter 1000 or the wireless power receiver 2000 may be a wireless communication terminal. For example, the wireless power transmitter 1000 or wireless power receiver 2000 may be a smart phone, a cellular phone, or a smart pad. At this time, the wireless power transmitter 1000 or the wireless power receiver 2000 may further include a communication circuit (not shown) for communicating with the base station.

A wireless power receiver according to an embodiment of the present invention includes: a sensor (seosor) for detecting the wireless power receiver; a plurality of receiving coils for receiving an alternating current from a transmitting coil of the wireless power transmitter; A converter for converting; And a controller for sensing the size of the transmission coil using the sensor and selecting at least one coil of the plurality of reception coils based on the sensed size, The sensor may be one of a geomagnetic sensor or a digital compass.

A wireless power transmitter according to an embodiment of the present invention includes a sensor (seosor) for detecting the wireless power receiver, a power converter for converting AC power received from a power source into transmission power, And a controller for sensing the size of the receive coil using the sensor and selecting at least one coil of the plurality of transmit coils based on the sensed size, , The sensor may be one of a geomagnetic sensor or a digital compass.

A wireless power receiver 2000 according to an embodiment of the present invention receives coordinate information of a wireless power transmitter 1000 from a wireless power transmitter 1000 through a control and communication unit 2600 and generates wireless power The transmitter 1000 can be detected.

A wireless power transmitter 1000 according to an embodiment of the present invention receives coordinate information of a wireless power receiver 2000 from a wireless power receiver 2000 through a control and communication unit 1500 and generates wireless power The receiver 2000 can be detected.

FIG. 12 is a flow chart illustrating an operation procedure and a signal flow of a wireless power transmitter and receiver according to an embodiment of the present invention.

Referring to FIG. 12, the wireless power transmitter 1201 may transmit wireless power to at least one of the first wireless power receiver 1203 and the second wireless power receiver 1205. In accordance with various embodiments of the present invention, the number of wireless power receivers may be one or more than two.

The wireless power transmitter 1201 may enter a setting step (S1207) for transmitting wireless power. The wireless power transmitter 1201 may enter the power-save step (S1209) when the setup for transmitting wireless power is complete. Wireless power transmitter 1201 may store power for transmitting wireless power. At this point, the wireless power transmitter 1201 may send a beacon signal to at least one wireless power receiver. For example, the wireless power transmitter 1201 may transmit a beacon signal to the first wireless power receiver 1203 (S1211).

The wireless power transmitter 1201 may enter the low power step S1213. The wireless power transmitter 1201 may send and receive signals to detect at least one wireless power receiver in the low power stage (S1215). For example, the wireless power transmitter 1201 may receive a signal for detecting the wireless power transmitter 1201 from the first wireless power receiver 1203. The wireless power transmitter 1201 may transmit a response signal to the detection signal to the first wireless power receiver 1203. [ The wireless power transmitter 1201 may transmit wireless power to the first wireless power receiver 1203 based on the detection result.

The wireless power transmitter 1201 according to an embodiment of the present invention may not transmit or receive signals for detecting at least one wireless power receiver. For example, the wireless power transmitter 1201 may not transmit the beacon signal to the first wireless power receiver 1203. The wireless power transmitter 1201 may detect at least one wireless power receiver using a geomagnetic sensor. That is, the wireless power transmitter 1201 can detect at least one wireless power receiver using a geomagnetic sensor, without a separate beacon signal.

For example, the wireless power transmitter 1201 may detect a receiver of at least one of the first wireless power receiver 1203 and the second wireless power receiver 1205 using a geomagnetic sensor. For example, the wireless power transmitter 1201 may detect the first one of the first wireless power receiver 1203 and the second wireless power receiver 1205. The wireless power transmitter 1201 can select one of the plurality of transmission coils based on the detection result. The wireless power transmitter 1201 may transmit wireless power to the second wireless power receiver 1205 via the selected transmission coil.

A wireless power receiver according to an embodiment of the present invention can detect a wireless power transmitter using the geomagnetic sensor of the wireless power receiver. For example, the first wireless power receiver 1203 may detect the wireless power transmitter 1201 using the geomagnetic sensor of the first wireless power receiver 1203. The first wireless power receiver 1203 can select one of the plurality of receiving coils based on the detection result. The wireless power receiver 1203 may receive wireless power from the wireless power transmitter 1201 via the selected receiving coil.

The wireless power transmitter 1201 according to an embodiment of the present invention may acquire coordinate information of the wireless power transmitter 1201 using a geomagnetic sensor and transmit the coordinate information to at least one wireless power receiver. For example, the wireless power transmitter 1201 may transmit the coordinate information of the wireless power transmitter 1201 to the first wireless power receiver 1203. The first wireless power receiver 1203 may detect the wireless power transmitter 1201 based on the coordinate information. The first wireless power receiver 1203 can select one of the plurality of receiving coils based on the detection result. The wireless power receiver 1203 may receive wireless power from the wireless power transmitter 1201 via the selected receiving coil.

A wireless power receiver according to an embodiment of the present invention may acquire coordinate information of a wireless power receiver using a geomagnetic sensor and transmit the coordinate information to a wireless power transmitter. For example, the first wireless power receiver 1203 may transmit the coordinate information of the first wireless power receiver 1203 to the wireless power transmitter 1201. The wireless power transmitter 1201 may detect the first wireless power receiver 1203 based on the coordinate information. The wireless power transmitter 1201 can select one of the plurality of transmission coils based on the detection result. The wireless power transmitter 1201 may transmit wireless power to the second wireless power receiver 1205 via the selected transmission coil.

A wireless power transmitter 1201 according to an embodiment of the present invention detects at least one wireless power receiver using a geomagnetic sensor to detect at least one wireless power receiver without any additional signal exchange to detect the at least one wireless power receiver. The power receiver can be detected. Also, the wireless power transmitter 1201 can detect the at least one wireless power receiver without utilizing a separate impedance measurement by detecting at least one wireless power receiver using a geomagnetic sensor. Further, the wireless power transmitter 1201 can detect the position of the wireless power receiver accurately using the coordinate information, by detecting the at least one wireless power receiver using the geomagnetic sensor.

The wireless power transmitter 1201 may receive (1221) status information from the first wireless power receiver 1203. For example, the first wireless power receiver 1203 may send information to the wireless power transmitter 1201 about the wireless power reception state of the first wireless power receiver 1203. [

The wireless power transmitter 1201 may send and receive a signal for detecting the second wireless power receiver 1205 with the second wireless power receiver 1205 (S1223). For example, the second wireless power receiver 1205 may transmit a detection signal to the wireless power transmitter 1201. [ The wireless power transmitter 1201 may transmit a response signal to the detection signal to the second wireless power receiver 1205. [

The wireless power transmitter 1201 according to the embodiment of the present invention may not transmit or receive the detection signal. The wireless power transmitter 1201 may detect at least one wireless power receiver using a geomagnetic sensor.

The wireless power transmitter 1201 may determine the wireless power transmission mode (S1225). For example, the wireless power transmitter 1201 may send a message to at least one wireless power receiver indicating whether the wireless power transmission is enabled or disabled.

The wireless power transmitter 1201 according to the embodiment of the present invention can confirm the change of the position of the wireless power transmitter 1201 or the change of the position of at least one wireless power receiver using the geomagnetic sensor. The wireless power receiver may also use a geomagnetic sensor to confirm the location change of the wireless power receiver or the location change of the wireless power transmitter. That is, the wireless power transmitter or the wireless power receiver can determine whether to transmit or receive wireless power using each geomagnetic sensor.

The wireless power transmitter 1201 according to the embodiment of the present invention can detect at least one wireless power receiver using the geomagnetic sensor, thereby omitting a separate foreign matter detection process.

FIG. 13 is a flowchart illustrating an operation procedure and a signal flow of a wireless power transmitter and receiver according to another embodiment of the present invention.

Referring to FIG. 13, the wireless power transmitter 1301 may transmit wireless power to at least one of the first wireless power receiver 1303 and the second wireless power receiver 1305. In accordance with various embodiments of the present invention, the number of wireless power receivers may be one or more than two.

The wireless power transmitter 1301 may enter an analogue step (S1307) for detecting at least one wireless power receiver. The wireless power transmitter 1301 can send and receive analog ping signals with at least one wireless power receiver.

The wireless power transmitter 1301 may enter a digital-to-digital phase (S1309) for detecting at least one wireless power receiver. The wireless power transmitter 1301 can send and receive digital ping signals with at least one wireless power receiver.

The wireless power transmitter 1301 may identify at least one wireless power receiver and perform a setting to transmit wireless power to the at least one wireless power receiver (S1311). The wireless power transmitter 1301 may enter the power transmission step S313. The wireless power transmitter 1301 may transmit wireless power to at least one identified wireless power receiver (S1315).

The wireless power transmitter 1301 according to an embodiment of the present invention may not transmit or receive signals for detecting at least one wireless power receiver. For example, the wireless power transmitter 1301 may not transmit or receive the analog zip signal or the digital zip signal with at least one wireless power receiver.

The wireless power transmitter 1301 may detect at least one wireless power receiver using a geomagnetic sensor. That is, the wireless power transmitter 1301 can detect at least one wireless power receiver using a geomagnetic sensor, without a separate detection signal.

For example, the wireless power transmitter 1301 may detect a receiver of at least one of the first wireless power receiver 1203 and the second wireless power receiver 1305 using a geomagnetic sensor. For example, the wireless power transmitter 1301 may detect the first wireless power receiver 1303 and the first one of the second wireless power receiver 1305. The wireless power transmitter 1301 can select one of the plurality of transmission coils based on the detection result. The wireless power transmitter 1301 may transmit wireless power to the second wireless power receiver 1305 via the selected transmission coil.

A wireless power receiver according to an embodiment of the present invention can detect a wireless power transmitter using the geomagnetic sensor of the wireless power receiver. For example, the first wireless power receiver 1303 may detect the wireless power transmitter 1301 using the geomagnetic sensor of the first wireless power receiver 1303. The first wireless power receiver 1303 can select one of the plurality of receiving coils based on the detection result. The wireless power receiver 1303 may receive wireless power from the wireless power transmitter 1301 via the selected receiving coil.

The wireless power transmitter 1301 according to an embodiment of the present invention can acquire the coordinate information of the wireless power transmitter 1301 using the geomagnetic sensor and transmit the coordinate information to at least one wireless power receiver. For example, the wireless power transmitter 1301 may transmit the coordinate information of the wireless power transmitter 1301 to the first wireless power receiver 1303. The first wireless power receiver 1303 may detect the wireless power transmitter 1301 based on the coordinate information. The first wireless power receiver 1303 can select one of the plurality of receiving coils based on the detection result. The wireless power receiver 1303 may receive wireless power from the wireless power transmitter 1301 via the selected receiving coil.

A wireless power receiver according to an embodiment of the present invention obtains coordinate information of a wireless power receiver using a geomagnetic sensor and transmits the coordinate information to a wireless power transmitter. For example, the first wireless power receiver 1303 may transmit the coordinate information of the first wireless power receiver 1303 to the wireless power transmitter 1301. The wireless power transmitter 1301 may detect the first wireless power receiver 1303 based on the coordinate information. The wireless power transmitter 1301 can select one of the plurality of transmission coils based on the detection result. The wireless power transmitter 1301 may transmit wireless power to the second wireless power receiver 1305 via the selected transmission coil.

A wireless power transmitter 1301 according to an embodiment of the present invention may detect at least one wireless power receiver using a geomagnetic sensor to detect at least one wireless power receiver without any additional signal exchange to detect the at least one wireless power receiver. The power receiver can be detected. In addition, the wireless power transmitter 1301 can detect the at least one wireless power receiver without utilizing a separate impedance measurement by detecting at least one wireless power receiver using a geomagnetic sensor. Further, the wireless power transmitter 1301 can detect the position of the wireless power receiver accurately using the coordinate information by detecting the at least one wireless power receiver using the geomagnetic sensor.

The wireless power transmitter 1301 may receive status information from the first wireless power receiver 1303 (1317). For example, the first wireless power receiver 1303 may send information to the wireless power transmitter 1301 about the wireless power receiving state of the first wireless power receiver 1303. [

The wireless power transmitter 1301 may send and receive a signal for detecting the second wireless power receiver 1305 with the second wireless power receiver 1305 (S1319). For example, the second wireless power receiver 1305 may send a signal strength indicator to the wireless power transmitter 1301. [ The wireless power transmitter 1301 may send a response signal to the second wireless power receiver 1305 for a signal strength indicator.

The wireless power transmitter 1301 may determine the wireless power transmission mode (S1321). For example, the wireless power transmitter 1301 may send a message to at least one wireless power receiver indicating whether the wireless power transmission is enabled or disabled.

The wireless power transmitter 1301 may identify (S1323) the second wireless power receiver 1305 and transmit it to the second wireless power receiver 1305 for transmission. The wireless power transmitter 1301 may transmit wireless power to the second wireless power receiver 1305 (S1325). The second wireless power receiver 1305 may transmit the charging status information to the wireless power transmitter 1301 (S1327). The wireless power transmitter 1301 may determine the wireless power transmission mode (S1329).

The wireless power transmitter 1201 according to the embodiment of the present invention can detect the second wireless power receiver S1305 using a geomagnetic sensor. That is, the wireless power transmitter 1201 can detect the second wireless power receiver 1205 using the geomagnetic sensor without a separate detection signal.

The wireless power transmitter 1201 according to the embodiment of the present invention can confirm the change of the position of the wireless power transmitter 1201 or the change of the position of at least one wireless power receiver using the geomagnetic sensor. The wireless power receiver may also use a geomagnetic sensor to confirm the location change of the wireless power receiver or the location change of the wireless power transmitter. That is, the wireless power transmitter or the wireless power receiver can determine whether to transmit or receive wireless power using each geomagnetic sensor.

The wireless power transmitter 1301 according to the embodiment of the present invention may detect at least one wireless power receiver using the geomagnetic sensor, thereby omitting a separate foreign matter detection process.

A method of operating a wireless power transmitter in accordance with an embodiment of the present invention includes detecting at least one wireless power receiver, transmitting and receiving a configuration signal for transmitting wireless power to the at least one wireless power receiver, Transmitting the wireless power to a wireless power receiver; And terminating the wireless power transmission to the at least one wireless power receiver, wherein detecting the at least one wireless power receiver comprises: using the geomagnetic sensor of the wireless power transmitter to detect the at least one wireless power receiver Wherein terminating the wireless power transmission comprises detecting a change in position of the wireless power transmitter or a change in position of the at least one wireless power receiver using a geomagnetic sensor of the wireless power transmitter, And determining whether to terminate the wireless power transmission.

A method of operating a wireless power receiver in accordance with an embodiment of the present invention includes the steps of detecting a wireless power transmitter, transmitting and receiving a configuration signal to receive wireless power with the wireless power transmitter, Receiving; And terminating the wireless power reception with the wireless power transmitter, wherein detecting the wireless power transmitter includes detecting the wireless power transmitter using a geomagnetic sensor of the wireless power receiver, Wherein terminating the wireless power reception comprises determining whether the wireless power reception is terminated by detecting a change in position of the wireless power receiver or a change in position of the wireless power transmitter using the geomagnetic sensor of the wireless power receiver .

Claims (10)

The wireless power receiver
A sensor (seosor) for detecting the wireless power receiver;
A plurality of receiving coils for receiving an alternating current from a transmitting coil of a wireless power transmitter;
A converter for converting the AC power into a DC current;
A battery charged with the direct current;
And a controller for sensing the size of the transmission coil using the sensor and selecting at least one of the plurality of reception coils based on the sensed size,
Wherein the sensor is one of a geomagnetic sensor or a digital compass. The method according to claim 1,
Wherein the geomagnetic sensor or the digital compass senses the size of the transmitting coil using a hall effect. The method according to claim 1,
Further comprising a transceiver for receiving coordinate information of the wireless power transmitter from the wireless power transmitter,
And the controller detects the wireless power transmitter based on the coordinate information. The wireless power transmitter
A sensor (seosor) for detecting the wireless power receiver;
A power converter for converting AC power received from a power source into transmission power;
A plurality of transmit coils transmitting the transmit power to a receive coil of the wireless power receiver;
And a controller for sensing the size of the receiving coil using the sensor and selecting at least one coil of the plurality of transmitting coils based on the sensed size,
Wherein the sensor is one of a geomagnetic sensor or a digital compass. The method of claim 3,
Wherein the geomagnetic sensor or the digital compass senses the size of the wireless power receiver and the receiving coil using a hall effect. The method of claim 4,
Further comprising a transceiver for receiving coordinate information of the wireless power receiver from the wireless power receiver,
And the controller detects the wireless power receiver based on the coordinate information. A method of operating a wireless power transmitter,
Detecting at least one wireless power receiver;
Transmitting and receiving a setup signal for transmitting wireless power to the at least one wireless power receiver;
Transmitting the wireless power to the at least one wireless power receiver;
And terminating the wireless power transmission to the at least one wireless power receiver,
Wherein detecting the at least one wireless power receiver comprises detecting the at least one wireless power receiver using a geomagnetic sensor of the wireless power transmitter,
Wherein terminating the wireless power transmission comprises detecting a change in position of the wireless power transmitter or a change in position of the at least one wireless power receiver using the geomagnetic sensor of the wireless power transmitter to determine whether to terminate the wireless power transmission The method comprising the steps &lt; RTI ID = 0.0 &gt; of: &lt; / RTI &gt; The method of claim 7,
Wherein detecting the at least one wireless power receiver comprises:
Receiving coordinate information of the wireless power receiver from the wireless power receiver;
And detecting the wireless power receiver based on the coordinate information. A method of operating a wireless power receiver,
Detecting a wireless power transmitter;
Transmitting and receiving a setup signal for receiving wireless power with the wireless power transmitter;
Receiving the wireless power from the wireless power transmitter;
Terminating the wireless power reception with the wireless power transmitter,
Wherein detecting the wireless power transmitter includes detecting the wireless power transmitter using a geomagnetic sensor of the wireless power receiver,
Wherein terminating the wireless power reception comprises determining whether the wireless power reception is terminated by sensing a location change of the wireless power receiver or a location change of the wireless power transmitter using a geomagnetic sensor of the wireless power receiver / RTI &gt; The method of claim 1, The method of claim 9,
Wherein detecting the wireless power transmitter comprises:
Receiving coordinate information of the wireless power transmitter from the wireless power transmitter;
And detecting the wireless power transmitter based on the coordinate information.

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