KR20170105467A - Method for wireless transmitting power - Google Patents

Abstract

The embodiment relates to a method for transmitting wireless power. The method for transmitting wireless power according to the present embodiment includes a first sensing step of transmitting a first sensing signal for sensing a first power transmission mode and sensing a first response signal corresponding to the first sensing signal for a first predetermined time; a second sensing step of transmitting a second sensing signal for sensing a second power transmission mode and sensing a second response signal corresponding to the second sensing signal for a predetermined second time; a step of determining a power transmission mode for a wireless power receiving apparatus based on a first received signal which is one of the first response signal and the second response signal; and a step of transmitting power according to the determined power transmission method. The sensing operation and the power transmission operation of another power transmission mode are inactivated when power transmission is performed in the determined power transmission mode. It is possible to provide a wireless power transmission device having improved performance.

Description

[0001] METHOD FOR WIRELESS TRANSMITTING POWER [0002]

The present invention relates to a wireless power transmission apparatus and method

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 may be replaced and charged again. Here, in order to charge the battery, the electronic apparatus has a contact terminal for contacting the external charging apparatus. 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 charging system has been proposed. The wireless power charging system includes a wireless power transmission device and a wireless power reception device. Here, the electronic device is implemented as a wireless power receiving device. At this time, the wireless power transmission apparatus transmits power through the wireless transmission unit, and the wireless power reception apparatus receives power through the wireless reception unit.

As a method of implementing a wireless power charging system, there are typically a magnetic induction type and a magnetic 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 through the magnetic flux generated thereby.

The self-resonance method is a magnetic resonance technology that uses only electric field or magnetic field without using electromagnetic wave or current. It is characterized by using a band of several tens of MHz because the distance of power transmission is several meters or more.

In the case of configuring a wireless power transmission device according to each charging method or constructing a complex device, the magnetic fields generated in the coils may interfere with each other, so that the two charging mode may not operate normally. In addition, there is a problem that the cost and the deterioration of each part may be caused by installing and setting each hardware and software by taking an independent charging method.

Accordingly, the present invention provides a wireless power transmission apparatus with improved performance.

The present invention provides a wireless power transmission apparatus capable of various wireless power transmission schemes.

The wireless power transmission method according to the present exemplary embodiment includes transmitting a first sensing signal for sensing a first power transmission mode, sensing a first response signal corresponding to the first sensing signal for a first predetermined time, Sensing step; A second sensing step of transmitting a second sensing signal for sensing a second power transmission mode and sensing a second response signal corresponding to the second sensing signal for a predetermined second time; Determining a power transmission mode for the wireless power receiving apparatus based on the first response signal and the second response signal; And transmitting power according to the determined power transmission scheme, wherein the sensing operation and the power transmission operation of the other power transmission mode are inactivated when the power transmission is performed in the determined power transmission mode.

A wireless power transmission apparatus according to the present invention is a hybrid wireless power transmission apparatus that supports an inductive and a resonant mode and can provide various types of maximum power according to a minimum configuration, You can have an effect.

1 is a magnetic induction equivalent circuit.
2 is a self-resonant-type equivalent circuit.
3 is a block diagram showing a transmitter as one of subsystems constituting a wireless power transmission system.
4 is a block diagram illustrating a receiving unit as one of the subsystems constituting the wireless power transmission system.
5 is a block diagram of a wireless power transmission apparatus according to an embodiment of the present invention.
6 is a flowchart of a wireless power transmission operation according to an embodiment of the present invention.

Hereinafter, a detailed description will be given with reference to the drawings of a wireless power transmission system according to an embodiment of the present invention. 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 use a variety of frequency bands from low frequency (50 kHz) to high frequency (15 MHz) selectively for wireless power transmission, and it is necessary to support a communication system capable of exchanging 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 transmit coils that provide the device.

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 power receivers of multiple devices within a magnetic field area and manages the entire system.

Wireless Power Transfer System-Deivce: 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.

Scattering parameter: The S parameter is the ratio of the input port to the output port in terms of the input voltage to the output voltage on the frequency distribution (Transmission S21) or the self reflection value of each input / output port, Reflection (S11, S22) of the reflected output.

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 a noncontact energy transfer technique in which an electromotive force is generated in the load inductor Ll via a magnetic flux generated when the source inductor Ls and the load inductor L1 are brought close to each other and a current is supplied to one of the source inductors Ls . The self-resonance method combines two resonators to generate self-resonance due to the inherent frequency between two resonators, resonating at the same frequency and utilizing resonance techniques to form an electric field and a magnetic field in the same wavelength range. Transmission technology.

1 is a magnetic induction equivalent circuit.

Referring to FIG. 1, in a magnetic induction equivalent circuit, a transmitter includes a source voltage Vs, a source resistance Rs, a source capacitor Cs for impedance matching, and a magnetic coupling with a receiving unit, And a load coil Rl for an impedance matching and a load coil Ll for magnetic coupling with a transmitting unit. The load coil Rl may be implemented as a source coil Ls for impedance matching, And the degree of magnetic coupling between the source coil Ls and the load coil Ll can be expressed by mutual inductance Msl.

In FIG. 1, the ratio S21 of the input voltage to the output voltage is obtained from the magnetic induction equivalent circuit consisting only of the coil without the source capacitor Cs and the load capacitor Cl for impedance matching, The power transmission condition satisfies Equation (1) below.

Equation 1

Ls / Rs = L1 / R1

The maximum power transmission is possible when the ratio of the inductance of the transmission coil Ls to the source resistance Rs and the ratio of the inductance of the load coil Ll to the load resistance Rl are equal to each other. Since there is no capacitor that can compensate for reactance in a system with only an inductance, the value of the self reflection value S11 of the input / output port can not be zero at the point where the maximum power transfer occurs, and the mutual inductance Msl), the power transmission efficiency may vary greatly. Thus, the source capacitor Cs may be added to the transmitter as a compensation capacitor for impedance matching, and the load capacitor Cl may be added to the receiver. The compensation capacitors Cs and Cl may be connected in series or in parallel to the receiving coil Ls and the load coil Ll, respectively. 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 the self-resonant type equivalent circuit, a transmitter includes a source coil constituting a closed circuit by a series connection of a source voltage Vs, a source resistor Rs and a source inductor Ls, Side resonant coil constituting a closed circuit by a series connection of the transmission line L1 and the transmission-side resonance capacitor C1, and the reception unit is realized by a series connection of the load resistance Rl and the load inductor Ll, Side resonance coil constituting a closed circuit by a series connection of a load coil constituting a receiving side resonance inductor L2 and a receiving side resonance capacitor C2 and a receiving side resonance coil constituting a closed circuit constituted by a source inductor Ls and a transmitting side inductor L1 are magnetically coupled to each other by a coupling coefficient of K01 and the load inductor L1 and the load side resonance inductor L2 are magnetically coupled to each other by a coupling coefficient of K23 and the transmission side resonance inductor L1 and the reception side resonance inductor L2, (L2) is the coupling coefficient of L12, .

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.

3 is a block diagram showing a transmitter as one of subsystems constituting a wireless power transmission system.

3, the wireless power transmission system may include a transmitting unit 1000 and a receiving unit 2000 receiving radio power from the transmitting unit 1000, and the transmitting unit 1000 may include a transmitting side AC / A transmission side DC / AC conversion unit 1200, a transmission side impedance matching unit 1300, a transmission 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. 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. 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. In the case where 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 change the distance between metallic foreign matter, 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, etc., and as a correction method thereof, a multi-matching method using a capacitor, a matching method using a multi- 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 as subsystems. 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 Bluetooth system as an example of a communication system. 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.

Meanwhile, the transmitting unit 1000 may be configured with hardware different from the transmitting-side communication unit 1520, and the transmitting unit 1000 may be communicated in an out-band format. The transmitting unit 1000 and the transmitting-side communication unit 1520 may be implemented in one piece of hardware, and the transmitting unit 1000 may perform communication in an in-band format. The transmission side communication unit 1520 may be configured to be separate 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 .

4 is a block diagram illustrating a receiving unit as one of the subsystems constituting the wireless power transmission system.

4, the wireless power transmission system may include a transmitting unit 1000 and a receiving unit 2000 receiving radio power from the transmitting unit 1000. The receiving unit 2000 includes a receiving coil unit 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 provided with a near field communication 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 the 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 the radio power transmission of the magnetic induction type, the transmission side AC / DC conversion unit 1100 in the transmission unit 1000 converts the AC signal of 60 Hz to 110 V to 220 V And the transmission side DC / AC conversion unit 1200 can receive the DC signal and output the AC signal of 125 KHz. The receiving side AC / DC converting unit 2300 of the receiving unit 2000 receives the 125 KHz AC signal and converts it into a DC signal of 10 V to 20 V, and the receiving side DC / DC converting unit 2400 converts the DC For example, a 5V direct current signal to 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 receives the alternating current signal of 60 Hz from 110 V to 220 V and converts it into a DC signal of 10 V to 20 V, And the transmission side DC / AC conversion unit 1200 can receive the DC signal and output an AC signal of 6.78 MHz. The receiving AC / DC converting unit 2300 of the receiving unit 2000 receives the AC signal of 6.78 MHz and converts it into a receiving DC signal of 10 V to 20 V, and the DC / DC converting unit 2400 A direct current signal of, for example, 5V suitable for the load 2500 can be output to the load 2500.

5 is a block diagram of a wireless power transmission apparatus according to an embodiment of the present invention.

5, a wireless power transmission apparatus according to an embodiment of the present invention includes an AC-DC converting unit 3100, a transforming unit 3200, a main control unit 3300, a transmission control unit 3400, a switch unit 3500, A power conversion unit 3600, a matching unit 3700, and a coil unit 3800. [

The AC-DC converter 3100 can generate AC voltage received from the power supply 30 as a DC voltage.

The transforming unit 3200 can adjust the level of the DC power outputted from the AC-DC converting unit 3100 based on the control signal. The transforming unit 3200 can adjust the level of the DC power output from the AC-DC converting unit 3100 based on the control signal of the transmission control unit activated under the control of the main control unit 3700.

The transformer 3200 is referred to as a switched mode power supply (SPMS), a DC-DC transformer, or a DC-DC converter because it is based on a conversion from a DC input to a DC output.

The transforming unit 3200 may be configured as one of three types: a buck converter whose output voltage is lower than the input voltage, a boost converter whose output voltage is higher than the input voltage, and a buck-boost converter having both characteristics.

The control unit may include a main control unit 3300 and a transmission control unit 3400.

The main control unit 3300 can control the magnitude of the DC voltage output from the transforming unit 3200 in consideration of the maximum power transmission efficiency, the power demand of the receiving apparatus, and the present charging amount of the receiving apparatus.

Also, the main control unit 3300 can control the transmission control unit 3400 according to a power transmission scheme. The main control unit 3300 can acquire information on the charging mode from the receiver and control the transmission control unit 3400 according to the acquired charging mode.

The transmission control unit 3400 may include a first transmission control unit 3410 and a second transmission control unit 3420.

The first transmission control unit 3410 and the second transmission control unit 3420 can perform an operation for controlling the corresponding power transmission according to the power transmission scheme, respectively.

The first transmission control unit 3410 may be a control unit for controlling the electromagnetic induction type power transmission in the first charging mode. That is, the first transmission control unit 3410 can control an operation for transmitting power to the wireless power receiving apparatus by an electromagnetic induction method among the power transmission methods. The first transmission control unit 3410 may preferably be a Wireless Power Consortium (WPC) controller. The WPC controller can control operation to power nearby wireless power receiving devices using magnetic resonance techniques. The WPC controller can also control to transmit power to the wireless power receiving apparatus when the wireless power receiving apparatus is detected within a critical distance. The frequency for transmitting the power may be in the range of 110 to 205 KHz. Also, the second transmission control unit 3420 may be a control unit for controlling the power transmission of the resonance method in the second charging mode. That is, the second transmission control unit 3420 can control an operation for transmitting power to the wireless power receiving apparatus in the resonance mode among the power transmission modes. The second transmission control unit 3420 may preferably be an Alliance for Wireless Power (A4WP) controller. The A4WP controller can be controlled to transmit power to a remote wireless power receiver in preparation for the WPC controller. In addition, the A4WP controller can be configured with a Bluetooth (BLU: Bluetooth) controller (A4WP BLU controller). Accordingly, the A4WP Bluetooth controller can generate and transmit a magnetic resonance type power to perform Bluetooth communication with the wireless power receiving apparatus upon transmission to the wireless power receiving apparatus. In other words. Acquires wireless charging information and state information of the wireless power receiving apparatus through the Bluetooth communication, and controls the wireless power receiving apparatus to transmit an operation control signal. The A4WP Bluetooth controller can set a frequency for power transmission and a frequency for performing Bluetooth communication differently. Preferably, the frequency band for transmitting power is 6.78 MHz, and the frequency band for performing Bluetooth communication may be 2.4 GHz. The first transmission control section 3410 and the second transmission control section 3420 are not limited.

The first transmission control section 3410 can be enabled or disabled for sensing power of the wireless power receiver or controlling power transmission to the wireless power receiver based on the control of the main control section 3300. [

The first transmission control section 3410 may be activated prior to the second transmission control section 3420 based on the control of the main control section 3300. [ The first transmission control unit 3410 can detect the wireless power receiving apparatus in the active state and check whether the detected wireless power receiving apparatus is a wirelessly charged apparatus by the first charging scheme. The first transmission control unit 3410 confirms the charging mode of the wireless power receiving apparatus and transmits power to the wireless power receiving apparatus under the control of the first transmission control unit 3410 in the case of the apparatus to which the first charging mode is applied . Alternatively, the first transmission control section 3410 may operate based on the information on the charging mode acquired from the receiver based on the control of the main control section 3300. [

On the other hand, if the sensed charging mode is not the first charging mode, the first transmission control unit 3410 can disable the enabled first transmission control unit 3410 based on the control of the main control unit 3300 .

Also, the second transmission control section 3420 can be enabled in a state in which the first transmission control section 3410 is disabled based on the control of the main control section 3300. [ That is, the second transmission control unit 3420 is enabled in a state where the first transmission control unit 3410 is disabled, and can detect the charging mode of the wireless power receiving apparatus based on the control of the main control unit 3300. [ The second transmission control unit 3420 can perform power transmission to the wireless power receiving apparatus under the control of the second transmission control unit 3420 when the wireless power receiving apparatus is a device to which the second charging scheme is applied. Or the second transmission control section 3420 can operate based on the charging mode information acquired from the receiver based on the control of the main control section 3300. [

The first transmission control unit 3410 is first activated based on the control of the main control unit 3300 and the second transmission control unit 3420 is activated when the first transmission control unit 3410 is inactivated The first transmission control unit 3410 and the second transmission control unit 3420 may operate alternately.

The switch unit 3500 is connected to the transforming unit 3200 according to the charging method of the wireless power receiving apparatus based on the operation of the first transmission control unit 3410 and the second transmission control unit 3420 based on the control of the main control unit 3300. [ So that the generated power can be transmitted to either the resonance coil or the induction coil.

The switch unit 3500 can be switched so that the power output from the transforming unit 3200 is output to the first power converting unit 3610 when the power is transmitted in an induction manner based on the control signal of the main control unit 3300 . Also, when the power is transmitted in the self-resonance mode based on the control signal of the main control unit 3300, the switch unit 3500 is switched so that the power output from the transforming unit 3200 is output to the second power converting unit 3620 .

The switch unit 3500 may include any one of an analog switch, a MOSFET, and a transistor to perform a switching operation. The switch unit 3500 is not limited to the switch unit 3500. The switch unit 3500 may be variously applied to the apparatus for enabling the path setting by the switching operation.

The power conversion unit 3600 can generate power by converting a DC voltage of a certain level into an AC voltage by a switching pulse signal in the range of several tens KHz to several tens MHz. The power conversion unit 130 may generate "wakeup-power" or charge power "used in a receiving apparatus that enters the charging region by converting a DC voltage to an AC voltage. The wakeup power may be 0.1 to 1 mWatt The charging power may be the power required to charge the battery of the receiving apparatus or the power consumed in the operation of the receiving apparatus. The charging power may be a power of 1 mWatt to 200 Watt consumed in the load of the receiving apparatus Lt; / RTI >

The power conversion section 3600 may include a power amplifier for amplifying the DC voltage output from the transforming section 3200 based on the switching signal of the switch section 3500. [

The power conversion unit 3600 may be configured as an inverter. The power converting unit 3600 can convert the DC signal output from the transforming unit 3200 into an AC signal and adjust the frequency of the AC signal under the control of the power transmission system and the control unit accordingly. An example of this is a half bridge inverter or a full bridge inverter. 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 power conversion section 3600 is connected to the first power conversion section 3610 and the second power conversion section 3720 according to the charging method of the wireless power receiving apparatus based on the control of the main control section 3300 and the transmission control section 3400 Lt; / RTI >

The first power converting unit 3610 and the second power converting unit 3620 can perform power transmission of different methods.

The first power conversion unit 3610 may supply the power generated by the first transmission control unit 3410 to the induction coil 3810 in order to perform power transmission in a magnetic induction manner. The second power conversion unit 3620 can supply the power generated based on the control of the second transmission control unit 3420 to the resonance coil 3820 in order to perform power transmission in the resonance mode.

The first power conversion unit 3610 and the second power conversion unit 3620 can generate AC signals having different frequencies according to the transmission scheme. The first power conversion unit 3610 may generate an AC signal of 110 to 205 KHz based on the control of the first transmission control unit 3410 according to the first charging mode WPC. Also, the second power conversion section 3620 can generate an AC signal of 6.78 MHz based on the control of the second transmission control section 3420 in accordance with the resonance method (A4WP) of the second charging type.

The matching unit 3700 may include at least one of at least one passive element and at least one active element. The matching unit 3700 can maximize the power transmission efficiency by performing impedance matching between the transmitting apparatus 3000 and the receiving apparatus.

The matching unit 3700 may include a first impedance matching unit 3710 and a second impedance matching unit 3720 according to a transmission scheme. The first impedance matching unit 3710 and the second impedance matching unit 3720 may be connected to the first power conversion unit 3610 and the second power conversion unit 3620 of the power conversion unit 3600, respectively.

The first impedance matching unit 3710 may perform impedance matching with respect to power output from the first DC-AC converting unit 3610 when the power transmission method is the magnetic induction method. Also, the second impedance matching unit 3720 may perform impedance matching with respect to power output from the second DC-AC converting unit 3620 when the power transmission method is the resonance method.

The coil portion 3800 may be composed of a first coil portion 3810 and a second coil portion 3820 according to a power transmission scheme.

The first coil part 3810 is connected to the first impedance matching part 3710 by the first coil part 3810 when the wireless power receiving device is a device to which the first charging method is applied, Can be output to the corresponding wireless power receiving apparatus.

The second coil part 3820 is connected to the second impedance matching part 3720 by the second coil part 3820 when the wireless power receiving device is a device to which the second charging method is applied, Can be output to the corresponding wireless power receiving apparatus.

The first coil portion 3810 and the second coil portion 3820 may be composed of a single coil or a plurality of coils. When the coils of the first coil portion 3810 and the second coil portion 3820 are constituted by a plurality of coils, they can be overlapped with each other, and the overlapping area can be determined in consideration of the magnetic flux density variation and the magnetic field interference phenomenon .

The wireless power transmission apparatus 300 may also include a communication unit (not shown). The communication unit can perform bidirectional communication with the communication unit included in the wireless power receiving apparatus in a predetermined manner. For example, NFC (Near Field Communication), Zigbee communication. Infrared communication, visible light communication, Bluetooth communication, or the like.

The communication unit can transmit and receive mutual power information with the wireless power receiving apparatus. At this time, the power information may include at least one of a battery capacity, a battery remaining amount, a charging count, an amount of use, and a data rate of the receiving apparatus. Further, the communication unit can transmit a charging function control signal for controlling the charging function of the receiving apparatus based on the power information acquired from the receiving apparatus.

The charging function control signal may be a control signal that controls the receiving device to enable or disable the charging function.

The communication unit may perform communication in an out-band format or in an in-band format.

6, the wireless power transmission operation in the wireless power transmission apparatus according to the embodiment of the present invention will be described in detail with reference to FIG.

6 is a flowchart of a wireless power transmission operation according to an embodiment of the present invention.

6, the main control unit 3300 activates the first transmission control unit 3410 (S602) and outputs a signal for sensing the receiving apparatus (S604)

The main control unit 3300 may determine whether the receiving apparatus is detected by determining whether the receiving apparatus has received an acknowledgment signal for the output signal (S606)

When the main control unit 3300 detects a response signal to the output signal from the receiving apparatus, the main control unit 3300 can determine that the receiving apparatus is the receiving apparatus of the first charging scheme in which power transmission is performed by the first transmission control unit 3410 have. Therefore, the main control unit 3300 can receive the charging information including the charging amount information requested from the receiving apparatus. (S608)

The main control unit 3300 controls the first transmission control unit 3410 based on the charging information to generate electric power in the first charging mode and output the generated electric power to the corresponding receiving device.

In response to activation of the first transmission control unit 3410, the main control unit 3300 deactivates the state of the first transmission control unit 3410 when a response signal is not received from the reception device or the reception device is not detected (S612). ≪ RTI ID = 0.0 >

Thereafter, the main control unit 3300 can transition the state of the second transmission control unit 3420 from the inactive state to the active state (S614)

The main control unit 3300 may output a signal for detecting the receiving apparatus when the second transmission control unit 3420 is activated (S616)

The main control unit 3300 can determine whether the receiving apparatus is detected by determining whether a response signal to the output signal is received from the receiving apparatus (S618)

When the main control unit 3300 detects a response signal to the output signal from the receiving apparatus, the main control unit 3300 can determine that the receiving apparatus is the receiving apparatus of the second charging scheme in which power transmission is performed by the second transmission control unit 3420 have. Therefore, the main control unit 3300 can receive the charging information including the charging amount information requested from the receiving apparatus (S620)

The main control unit 3300 controls the second transmission control unit 3420 based on the charging information to generate electric power in the second charging mode and output the generated electric power to the corresponding receiving device.

In the above-described embodiment, it has been described that the transmission control units are activated / deactivated based on the control of the main control unit 3300 to determine whether the receiving apparatus is detected. However, it is also possible to request the charging method information from the receiving apparatus through the communication unit, obtain the response signal corresponding thereto, and to control the transmission controlling unit based on the charging method information acquired from the receiving apparatus.

Claims (5)

A first sensing step of transmitting a first sensing signal for sensing a first power transmission mode and sensing a first response signal corresponding to the first sensing signal for a first predetermined time;
A second sensing step of transmitting a second sensing signal for sensing a second power transmission mode and sensing a second response signal corresponding to the second sensing signal for a predetermined second time;
Determining a power transmission mode for the wireless power receiving apparatus based on the first response signal and the second response signal; And
And transmitting power according to the determined power transmission scheme,
Wherein the sensing operation and the power transmission operation of the other power transmission mode are deactivated when power is transmitted in the determined power transmission mode. The method according to claim 1,
Wherein the first sensing step or the second sensing step is performed first,
Wherein the control unit confirms whether a response signal corresponding to the sensing signal transmitted for the first time is received for a predetermined time. 3. The method of claim 2,
And if the response signal is not received for the predetermined period of time, transmits a subordinate detection signal. The method according to claim 1,
And when the power transmission is terminated by the determined power transmission method, the sensing step of either the first sensing step or the second sensing step is performed first. The method according to claim 1,
Wherein the first response signal and the second response signal include charge information of the wireless power receiving apparatus.

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