KR20130087455A - Wireless power transfer apparatus and method the same - Google Patents

Abstract

PURPOSE: A wireless power transmitting device and a method thereof are provided to always transmit power in an optimal state by supplying power to the power receiving device at a power transmitting coil. CONSTITUTION: A core assembly transmits power to a power receiving device. A power transmitting unit transmits the power to the power receiving device through a power transmitting coil. A power transmission control unit (121) controls the power transmission. A driver (122) generates a driving signal according to the control of the power transmission control unit. A serial resonant converter (123) generates first power and second power. [Reference numerals] (110) Alternating/direct current converter; (121) Power transmission control unit; (122) Driver; (123) Serial resonant converter; (124) Side coil driving unit; (127) Signal receiving unit; (220) Charging circuit; (230) Battery cell module; (240) Power receiving control unit; (250) Signal transmitting unit

Description

Wireless power transfer apparatus and method {Wireless power transfer apparatus and method the same}

According to an embodiment of the present invention, at least one coil is selected from among a central coil disposed at the center of the core and two side coils disposed at both the left and right sides of the core, depending on the position of the power receiving device. A wireless power transmitter and method for wirelessly transmitting power to a device.

In general, various portable terminals such as mobile phones and PDAs (Personal Digital Assistants) are equipped with a power receiving device intended to supply operating power.

The power receiving device charges the power supplied from an external charging device, and supplies the charged power to the portable terminal as operating power to operate the battery cell module for charging power from the external charging device. And a charge / discharge circuit for inputting the supplied power to charge the battery cell module and discharging the power charged to the battery cell module to supply the operating power to the portable terminal.

In a method of electrically connecting the charging device and the water receiving device, a terminal connection method is known in which a terminal through which electric power is output from the charging device and a terminal through which power is inputted from the water receiving device are directly connected through a cable and a connector have.

In the terminal connection method, the terminals of the charging device and the terminals of the power receiving device have different potential differences.

Therefore, instantaneous discharge occurs when the terminals of the charging device and the terminals of the power receiving device are connected to or separated from each other.

This instantaneous discharge phenomenon wastes the terminals of the charging device and the terminals of the water receiving device. Also, when foreign substances are piled up on the terminals of the charging device and the terminals of the water receiving apparatus, heat may be generated from the foreign matter by the instantaneous discharge phenomenon, and safety accidents such as fire may occur.

The electric power charged in the battery cell module of the water receiving apparatus due to moisture or the like is naturally discharged to the outside through the terminal of the water receiving apparatus, thereby shortening the useful life of the water receiving apparatus, there was.

In recent years, a wireless power transmission apparatus for wirelessly transmitting power to a receiving apparatus has been proposed in order to solve various problems of the terminal connection system.

The wireless power transmission apparatus wirelessly transmits power using, for example, an electromagnetic induction method. The power reception device receives the power transmitted by the wireless power transmission device wirelessly and charges the battery cell module with the received power.

The wireless power transmitter is wirelessly stable and transmits power with high efficiency. In addition, the power receiver is capable of receiving the maximum power transmitted by the wireless power transmitter to charge the battery cell module. Efforts have been made.

Since the wireless power transmitter has no coupling between terminals with the power receiver, it is required that the power receiver be placed at a proper position of the charging station provided in the wireless power transmitter.

However, the user frequently does not place the power receiver in the charging station. In addition, even when the user places the power receiver in the charging station, the position of the power receiver is moved when vibration occurs due to a call signal or the like on the portable terminal equipped with the power receiver while charging power. Frequent departures occur frequently.

The problem to be solved by the present invention is to provide a wireless power transmission apparatus and method capable of optimally transmitting power irrespective of the position of the power receiving device.

In addition, the problem to be solved by the present invention is a wireless power transmission device that can optimally transmit power even when the position of the power receiving device is moved to the vibration of the portable terminal in the state of charging power to the power receiving device mounted on the portable terminal and Provide a method.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. There will be.

The wireless power transmitter of the present invention includes a core assembly having one central coil and two side coils for transmitting power to a power receiving device, and each of the one central coil and the two side coils transmits power. Determine the amount of power received by the power receiving device, and select one of the central coil and the two side coils as a power transmission coil or simultaneously with the one central coil according to the determined amount of received power. And a power transmission unit for selecting one of the two side coils as a power transmission coil and transmitting power to the power receiving device through the selected power transmission coil.

The power transmission unit may include a power transmission control unit controlling power transmission, a driving driver generating a driving signal under the control of the power transmission control unit, and switching DC power according to the driving signal to generate first and second power. And a series resonant converter for generating the first power to the central coil, and selectively generating a first side coil driving signal and a second side coil driving signal under the control of the power transmission controller. And a side coil driver configured to be applied to the first side coil and the second side coil, and a signal receiver configured to receive a received power amount signal and a charge completion signal transmitted from the power receiver, and provide the received power signal to the power transmission controller.

In addition, the wireless power transmitter of the present invention selectively connects the second power to the first side coil and the second side coil while being selectively connected according to the first side coil driving signal and the second side coil driving signal. It includes a first and second switching unit.

The first power applied to the central coil and the second power applied to the first side coil or the second side coil have a phase difference of 180 °.

The wireless power transmitter of the present invention generates the driving signal and the second power for the driving driver to generate the first power when the series resonant converter generates both the first power and the second power. The phase difference of the driving signal is 180 ° so that the first power applied to the central coil and the second power applied to the first side coil and the second side coil have a 180 ° phase difference.

The core assembly may include a central coil installed at a position of a first level, a second coil different from the first level, and a portion of each of the first side coil and the second side disposed to overlap the central coil. And a coil, a central coil, and a core of a magnetic body formed to receive the first side coil and the second side coil.

The central coil is formed to have a different size from each of the first side coil and the second side coil.

The width along the first direction of the central coil is smaller than the width along the first direction of each of the first side coil and the second side coils.

The width along the first direction of the central coil is smaller than the width along the first direction of each of the first side coil and the second side coils.

The width along the first direction of the central coil is 30 to 50% of the sum of the widths along the first direction of each of the first side coil and the second side coils.

The width along the second direction of the central coil is equal to the width along the second direction of each of the first side coil and the second side coils.

The central coil is disposed above the first side coil and the second side coil.

The first side coil and the second side coil are formed to have the same size.

The first side coil and the second side coil are first conductive patterns and second conductive patterns formed in a pattern on a base which is an insulator disposed below the central coil.

In the wireless power transmission method of the present invention, the power transmission control unit selects one central coil and two side coils one by one to apply power to determine the amount of received power received by the power receiving device while transmitting power to the power receiving device; The power transmission controller selects one coil from one central coil and the two side coils according to the determined amount of received power, or selects one central coil and simultaneously selects one of the two side coils. Selecting one side coil, and applying power to the selected coil to transmit power to the power receiving device.

Determining whether the amount of received power received by the power receiver is reduced after applying power to the selected coil to transmit power to the power receiver; and when the amount of received power is reduced, the power transmission controller. Determining power received by the power receiving device while sequentially applying power to one central coil and two side coils to transmit power to the power receiving device, and according to the received power amount determined by the power transmission controller. Select one of the coils of the central coil and the two side coils of the, or at least one of the side coils of the two side coils at the same time as the selection of the central coil, the power to the selected coil Repeatedly repeat the step of applying power to the power receiving device.

In the wireless power transmitter and method of the present invention, by applying power to one central coil and two side coils sequentially, the power receiving device determines the amount of power received by the power receiving device, and according to the determined amount of received power. One or more coils among the one central coil and the two side coils are selected as a power transmission coil, and power is supplied to the selected power transmission coil to be transmitted to the power receiver.

Therefore, the power receiver can transmit power in an optimal state wherever the charging station is placed.

In addition, when the power is transmitted to the power receiving device and charged in the battery cell module, vibration occurs in the portable terminal equipped with the power receiving device. The power is sequentially applied to the two side coils again to transmit power to the power receiving device to determine the received power received by the crystal device, and according to the determined received power, one of the one central coil and the two side coils. The above coil is selected as the power transmission coil, and the electric power is supplied to the selected power transmission coil and transmitted to the power receiver.

Therefore, even when the position of the power receiving device is moved in the state of transmitting power to the power receiving device to charge the battery cell module, it is always possible to transmit power in an optimal state.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, which do not limit the present invention, and like reference numerals designate like elements in some drawings.
1 is a view showing the overall configuration of a wireless power transmission system including a wireless power transmission apparatus of the present invention;
2 is a signal flow diagram showing the operation of the power transmission control unit of the wireless power transmission apparatus according to the present invention,
3 is a diagram illustrating a coil selected as a power transmission coil from one central coil and two side coils in the wireless power transmitter of the present invention;
Figure 4 is a circuit diagram showing a detailed configuration of the side coil drive unit in the wireless power transmission device of the present invention,
5 is a circuit diagram illustrating a detailed configuration of a series resonant converter, a first switching unit, and a second switching unit in the wireless power transmitter of the present invention;
Figure 6 is an exploded perspective view showing the main components of the core assembly in the wireless power transmission device of the present invention,
Figure 7 is an assembled perspective view showing the main configuration of the core assembly in the wireless power transmission device of the present invention,
8A to 8C are cross-sectional views illustrating an arrangement state of two side coils provided in a core assembly in the wireless power transmitter of the present invention;
9 is a plan view for explaining the concept of the central coil and two side coils provided in the core assembly in the wireless power transmission apparatus of the present invention;
10 is a view for explaining an operation of transmitting power by selecting the central coil and the first side coil provided in the core assembly as a power transmission coil in the wireless power transmission apparatus of the present invention;
11 is an exploded perspective view showing the configuration of another embodiment of the core assembly in the wireless power transmission device of the present invention, and
12 is an exploded perspective view showing the configuration of another embodiment of a core assembly in a wireless power transmission device of the present invention.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, it is not intended to provide a more detailed structure than is necessary for a basic understanding of the present invention, but it should be understood by those skilled in the art that various forms that can be practiced in the present invention are illustrated in the drawings.

1 is a view showing the overall configuration of a wireless power transmission system including a wireless power transmission apparatus of the present invention. The wireless power transmission system is a wireless power transmission apparatus 100 of the present invention for wirelessly transmitting power, and receiving and charging and charging the power transmitted by the wireless power transmission apparatus 100, the portable terminal (in the drawing) It may include a power receiving device 200 for supplying the operating power to (not shown).

The wireless power transmitter 100 may include an AC / DC converter 110, a power transmission unit 120, and a core assembly 130.

The AC / DC converter 110 converts commercial AC power input from the outside into DC power, and supplies the converted DC power to the power transmission unit 120 as operating power.

Here, the AC / DC converter 110 is described as an example that is integrally provided in the wireless power transmitter 100, in the embodiment of the present invention, the AC / DC converter 110 is the wireless power transmitter. It may be provided separately to the outside of the 100 to supply the DC power to the power transmission unit 120.

The core assembly 130 includes a core 400 to be described later, one central coil 131 positioned at the center of the core 400, and two side coils positioned at both left and right sides of the core 400. 133 and 135, that is, the first side coil 133 and the second side coil 135 may be included.

The power transmission unit 120 generates a first AC power and a second AC power by switching the DC power converted by the AC / DC converter 110, and generates the generated first AC power to the core assembly 130. It is supplied to one central coil 131 provided, and selectively supplies the generated second AC power to the first side coil 133 and the second side coil 135 to transmit power wirelessly.

The power transmission unit 120 includes a power transmission control unit 121, a driving driver 122, a series resonant converter 123, a side coil driving unit 124, a first switching unit 125, and a second switching unit 126. ) And a signal receiver 127.

The power transmission control unit 121 determines the amount of power received by the power receiving device 200 when each of the central coil 131 and the two side coils 133 and 135 transmits power. At least one of the central coil 131 and the two side coils 133 and 135 is selected as a power transmission coil according to the determined amount of received power, and the power receiver 200 is selected through the selected power transmission coil. Control transfer of power.

The driving driver 122 may drive driving signals A11 to A14 and two to transmit power to the power receiving device 200 through the central coil 131 under the control of the power transmission control unit 121. The side coils 133 and 135 are selectively used to generate driving signals A21 to A24 for transmitting power to the power receiving device 200.

The series resonant converter 123 switches the DC power output from the AC / DC converter 110 according to the driving signals A11 to A14 (A21 to A24) generated by the driving driver 122 to the First AC power to be transmitted through the central coil 131 and second AC power to be transmitted are selectively generated using the two side coils 133 and 135.

The side coil driving unit 124 may include a first side coil driving signal S1 for selectively supplying the second AC power to the two side coils 133 and 135 under the control of the power transmission control unit 121. The second side coil driving signal S2 is selectively generated.

The first switching unit 125 and the second switching unit 126 are selectively connected according to the first side coil driving signal S1 and the second side coil driving signal S2, and the series resonant converter The second AC power generated by 123 is selectively supplied to the first side coil 133 and the second side coil 135.

The signal receiving unit 127 receives various signals including a received power amount signal and a charging completion signal transmitted from the power receiving device 200 and provides them to the power transmission control unit 121.

The power receiving device 200 may include a power receiving coil 210, a charging circuit 220, a battery cell module 230, a power receiving control unit 240, and a signal transmitting unit 250.

The power receiving coil 210 receives the AC power transmitted by the wireless power transmitter 100 through the core assembly 130.

The charging circuit 220 converts the AC power received by the power receiving coil 210 into DC power.

The battery cell module 230 charges the DC power converted by the charging circuit 220.

The power receiving control unit 240 controls the charging circuit 220 to charge the battery cell module 230, and the amount of received power received by the power receiving coil 210 and the battery cell module 230. Determine various charges including the received power amount signal and the charge completion signal, and control the transmission of the generated various signals to the wireless power transmitter 100 through the power receiving coil 210. .

The signal transmitting unit 250 generates various signals including the received power amount signal and the charging completion signal under the control of the power receiving control unit 240 to transmit the wireless power through the power receiving coil 210. To the device 100.

In the drawing description of FIG. 1, reference numerals C1 and C2 and L1 and L2 selectively supply first AC power and second AC power to the central coil 131 and the two side coils 133 and 135. In the case of transmitting power to the power receiving device 200, the central coil 131 and the two side coils 133 and 135 are connected in series, respectively, and the central coil 131 and the two side coils 133, 135 capacitors and coils that cause series resonance to occur.

In the wireless power transmission system having such a configuration, as shown in FIG. 2, the power transmission control unit 121 has a power receiving device 200 placed on a charging stand (not shown) where the core assembly 130 is installed. It is determined whether there is (S300).

Here, the core assembly 130 is provided at the lower portion of the charging stand, and the power receiving device 200 is installed in the charging stand using the central coil 131 and the two side coils 133 and 135 of the core assembly 130. The operation of determining whether or not) is placed is a general operation and a detailed operation is omitted.

When it is determined in step S300 that the power receiving device 200 is placed on the charging station, the power transmission control unit 121 has one central coil 131 and two side coils 133 and 135, respectively. Supplying power while sequentially selecting one by one to transmit power to the power receiving device 200 (S302).

That is, the power transfer control unit 121 controls the drive driver 122 to generate the drive signals A11 to A14, and the series resonant converter 123 is connected to the AC / AC according to the generated drive signals A11 to A14. The DC power output from the DC converter 110 is switched to generate first AC power. Then, the first AC power generated by the series resonant converter 123 is applied to the one central coil 131 through the capacitor C1 and the coil L1 to generate resonance in the central coil 131. While transmitting power wirelessly to the power receiving device 200.

After the power is supplied to the central coil 131 to transmit power to the power receiving device 200, the power transmission control unit 121 controls the driving driver 122 to generate driving signals A21 to A24. The series resonant converter 123 switches the DC power output from the AC / DC converter 110 to generate the second AC power according to the generated driving signals A21 to A24. The power transmission control unit 121 controls the side coil driving unit 124 to generate the first side coil driving signal S1, and the generated first side coil driving signal S1 is the first switching unit 125. Is applied to and connected. Then, the second AC power generated by the series resonant converter 123 is applied to the first side coil 133 through the capacitor C2, the coil L2, and the first switching unit 125, thereby providing the first side surface. Resonance occurs in the coil 133 to wirelessly transmit power to the power receiving device 200.

After power is supplied to the first side coil 133 to transmit power to the power receiving device 200, the power transmission control unit 121 controls the driving driver 122 to continue driving signals A21 to A24. And the series resonant converter 123 switches the DC power output from the AC / DC converter 110 according to the generated driving signals A21 to A24 to generate the second AC power. The power transmission controller 121 controls the side coil driver 124 to generate the second side coil driving signal S2, and the generated second side coil driving signal S2 is the second switching unit 126. Is applied to and connected. Then, the second AC power generated by the series resonant converter 123 is applied to the second side coil 135 through the capacitor C2, the coil L2, and the second switching unit 126, so that the second side power is generated. Resonance occurs in the coil 135 to wirelessly transmit power to the power receiver 200.

Here, the power transmission controller 210 sequentially selects the central coil 131, the first side coil 133, and the second side coil 135 to transmit power to the power receiving device 200. For example, in implementing the wireless power transmitter 100 of the present invention, the power receiver 200 is provided through the central coil 131, the first side coil 133, and the second side coil 135. The order of transmitting power in () can be arbitrarily changed.

In the state in which the central coil 131, the first side coil 133 and the second side coil 135 are sequentially selected to transmit power to the power receiving device 200, the power transmission control unit 121 When the power is transmitted using the central coil 131 and each of the two side coils 133 and 135, the power receiver 200 determines the received power amount (S304).

That is, power is transmitted by the power receiver 200 when power is transmitted to the power receiver 200 by sequentially using each of the central coil 131 and the two side coils 133 and 135. The coil 210 receives and converts the received power into DC power and charges the battery cell module 230.

In this case, the power receiving control unit 240 of the power receiving device 200 determines the amount of power received by the power receiving coil 210 as the power charged by the charging circuit 220 to the battery cell module 230. .

The power reception control unit 240 controls the signal transmission unit 250 according to the determined amount of received power to generate a received power signal, and the generated received power signal is received through the power reception coil 210 to the central coil 131. ) And the two side coils 133 and 135. The received power amount signal induced by the central coil 131 and the two side coils 133 and 135 is received by the signal receiver 127 and provided to the power transmission controller 121. The power transmission control unit 121 inputs a received power amount signal output from the signal receiving unit 127 to transmit power using the central coil 131 and each of the two side coils 133 and 135. When the power receiving device 200 determines the amount of received power.

* When the received amount of power is determined, the power transmission control unit 121 uses the determined amount of received power to transmit the received power to the power receiving device 200 among the central coil 131 and the two side coils 133 and 135. At least one coil capable of transmitting power in an optimal state is selected as a power transmission coil to transmit power (S306).

For example, in the present invention, as shown in FIG. 3, the power receiving device 200 may be positioned above the first side coil 133 to transmit power in an optimal state using only the first side coil 133. If it is determined that the power transmission control unit 121 selects only the first side coil 133 as a power transmission coil.

When it is determined that the power receiving device 200 is located above the central coil 131 and can transmit power in an optimal state only by the central coil 131, the power transmission controller 121 controls the central coil ( Only 131 is selected as the power transmission coil.

When it is determined that the power receiving device 200 is positioned above the second side coil 131 and can transmit power in an optimal state using only the second side coil 131, the power transmission control unit 121 is Only the second side coil 135 is selected as the power transmission coil.

In addition, according to the present invention, the power receiving device 200 is positioned above the first side coil 133 and the central coil 131 to be optimal through the first side coil 133 and the central coil 131. When it is determined that power can be transmitted in a state, the power transmission control unit 121 selects the first side coil 133 and the central coil 131 as a power transmission coil.

The power receiving device 200 is positioned above the central coil 131 and the second side coil 135 to transmit power in an optimal state through the central coil 131 and the second side coil 135. If it can be determined that the power transmission control unit 121 selects the central coil 131 and the second side coil 135 as a power transmission coil.

When the power transmission coil to transmit power is selected in this way, the power transmission control unit 121 controls the driving driver 122 and the side coil driving unit 124 to select the central coil 131 selected as the selected power transmission coil. And selectively supply the first AC power and the second AC power to the two side coils 133 and 135, and transmit the supplied AC power to the power receiving device 200 (S308).

In this state, the power transmission control unit 121 inputs a signal received by the signal receiving unit 129 to determine whether a charging completion signal is received from the power receiver 200 (S310), and the charging is completed. When the signal is not received, it is determined whether the received power amount received by the power receiver 200 is reduced using the received power amount signal received by the signal receiver 129 (S312).

As a result of the determination, when the charging completion signal is not received and the amount of received power is not reduced, the power transmission control unit 121 returns to step S308 and the power receiving device 200 through the selected power transmission coil. The power is transmitted to the controller and the input signal is received by the signal receiver 129 to repeatedly determine whether the charging completion signal is received and whether the amount of the received power is reduced.

In this state, when the position of the portable terminal equipped with the power receiver 200 is vibrated and the position is moved, the amount of power received by the power receiver 200 is reduced.

Then, the power receiving control unit 240 of the power receiving device 200 controls the signal transmitting unit 250 to generate a received power amount signal indicating that the received power amount is reduced, the generated received power amount signal is the wireless power transmitter 100 Is sent to.

The power transmission controller 121 of the wireless power transmitter 100 determines whether the received power amount of the power receiver 200 is reduced by inputting the received power amount signal received by the signal receiver 129, and the received power amount is reduced. When it is decreased, the process returns to the step S302, and as described above, the received power amount is transmitted while transmitting power to the power receiver 200 through the central coil 131 and the two side coils 133 and 135, respectively. The power transmission coil selects one or more coils capable of transmitting power to the power receiving device 200 in an optimal state according to the determined amount of received power, and the driving driver 122 and the side coil driving unit according to the selected power transmission coil. By selectively controlling 124, the operation of repeatedly transmitting power to the power receiver 200 in an optimal state is repeatedly performed.

In this way, when the battery cell module 230 is fully charged in a state where power is transmitted to the power receiver 200 in an optimal state, the power reception controller 240 controls the signal transmitter 250. The charging completion signal is generated, and the generated charging completion signal is transmitted to the wireless power transmitter 100 through the power reception coil 210.

The power transmission controller 121 of the wireless power transmitter 100 determines whether a charge completion signal is received by inputting a signal from the signal receiver 129, and transmits power when the charge completion signal is received. It stops (S314).

4 is a circuit diagram illustrating a detailed configuration of the side coil driver 124 in the wireless power transmitter 100 of the present invention. Referring to FIG. 4, in the side coil driver 124 of the present invention, an output terminal from which the control signal is output from the power transmission control unit 121 is connected to the resistor R3 and the transistor Q1 through the resistor R1. The output terminal from which the control signal is output from the power transmission control unit 121 is connected to the resistor R4 and the transistor Q2 through the inverter INV and the resistor R2.

The power supply terminal Vcc is connected to the emitters of the transistors Q3 and Q4, and is connected to the bases of the transistors Q3 and Q4 through the resistors R5 and R6, respectively. R6 and each connection point of the transistors Q3 and Q4 are connected to the collectors of the transistors Q1 and Q2 via resistors R7 and R8, respectively.

In addition, capacitors C3 and C4 are connected to the collectors of the transistors Q3 and Q4, respectively, and resistors R9 at the connection points of the collectors of the transistors Q3 and Q4 and the capacitors C3 and C4. The first side coil driving signal S1 and the second side coil driving signal S2 are output to the first switching unit 125 and the second switching unit 126 through R10.

The side coil drive unit 124 of the present invention configured as described above has the high potential signal when the power transmission controller 121 outputs a high potential signal of logic 1 as a control signal while operating power is applied to the power terminal Vcc. Is applied to the base of transistor Q1 through resistor R1.

Then, the transistor Q1 is turned on, the operating power of the power supply terminal Vcc flows to ground through the resistors R5 and R7 and the transistor Q1, and the transistor Q3 is turned on, and the power supply terminal Vcc is turned on. After the operation power of the noise is removed by the capacitor (C3) through the transistor (Q3) is output as the first side coil driving signal (S1) through the resistor (R9) to the first switching unit 125 is connected It becomes (on) state.

In this case, since the high potential signal of logic 1 output from the power transmission control unit 121 is converted into a low potential signal of logic 0 through the inverter INV, the transistor Q2 is applied to the base of the transistor Q2. As the transistor Q2 is turned off, the transistor Q4 is also turned off so that the second side coil driving signal S2 is not output, and the second switching unit 126 is turned off.

When the power transfer control unit 121 outputs a low potential signal of logic 0 as a control signal, the transistor Q1 is turned off because the transistor Q1 is applied to the base of the transistor Q1. Q3 is also turned off so that the first switching signal S1 is not output, and the first switching unit 125 is turned off (off).

In this case, since the low potential signal of logic 0 output from the power transmission controller 121 is converted into a high potential signal of logic 1 through an inverter INV, the transistor Q2 is applied to the base of the transistor Q2. On, the transistor Q4 is turned on and the second switching signal S2 is output as the transistor Q2 is turned on, and the second switching unit 126 is switched to a connected (on) state.

5 is a circuit diagram showing the detailed configuration of the series resonant converter 123, the first switching unit 125 and the second switching unit 126 in the wireless power transmission apparatus of the present invention. Referring to FIG. 5, the series resonant converter 123 of the present invention includes PMOS and NMOS transistors PM1 and NM1 (PM2 and NM2) (PM3 and NM3) (PM4) between a power supply terminal Vcc and ground. And NM4 are connected in series, and diodes D1 to D8 are respectively connected between the source and the drain of the PMOS transistors PM1 to PM4 and the NMOS transistors NM1 to NM4, respectively. The first power is output at the connection point of the MOS transistors PM1 and NM1 (PM2 and NM2), and the second power is output at the connection point of the PMOS and NMOS transistors PM3 and NM3 (PM4 and NM4). 131 is configured to be applied.

In addition, each of the first and second side coil driving signals S1 and S2 of the first and second switching units 125 and 126 of the present invention is connected to the NMOS transistors NM5 and NM6 of NM7 and NM8. In addition to being connected to the gate, the connection point is commonly connected to the sources of the NMOS transistors NM5 and NM6 (NM7 and NM8) via resistors R11 and R12, respectively, and the NMOS transistors NM5 to NM8. The diodes D9 to D12 are respectively connected between the source and the drain.

In addition, the drains of the NMOS transistors NM5 and NM8 are connected to each other, and the first side coil 133 and the second side coil 135 are connected in series between the drains of the NMOS transistors NM6 and NM7. Second power output from the series resonant converter 123 at a connection point of a drain of the NMOS transistors NM5 and NM8 and a connection point of the first side coil 133 and the second side coil 135. It is configured to be applied.

According to the present invention configured as described above, when the first side coil driving signal S1 is output from the side coil driving unit 124, both of the NMOS transistors NM5 and NM6 of the first switching unit 125 are turned on. The switching section 125 is brought into a connected state.

In addition, when the second side coil driving signal S2 is output from the side coil driver 124, the NMOS transistors NM7 and NM8 of the second switching unit 126 are turned on, so that the second switching unit 126 is turned on. Becomes the connected state.

Here, the side coil driving unit 124 selectively outputs the first side coil driving signal S1 and the second side coil driving signal S2, so that the first switching unit 125 and the second switching unit 126 is not simultaneously connected or disconnected, and when one is connected, the other is blocked.

The PMOS transistor PM3 and the NMOS transistor NM4 of the series resonant converter 123 are turned on according to the drive signals A21 to A24 output by the drive driver 123, and the PMOS transistor PM4 is turned on. ) And the operating power of the power supply terminal Vcc is the PMOS transistor PM3, the capacitor C1, the coil L1, the central coil 131, and the NMOS transistor when the NMOS transistor NM3 is turned off. NM4 flows sequentially. In addition, the PMOS transistor PM3 and the NMOS transistor NM4 of the series resonant converter 123 are turned off in response to the driving signals A21 to A24 output by the driving driver 123, and the PMOS transistor ( When the PM4 and the NMOS transistor NM3 are turned on, the operating power of the power supply terminal Vcc is the PMOS transistor PM4, the central coil 131, the coil L1, the capacitor C1, and the NMOS. The transistor NM3 flows sequentially.

As described above, the PMOS transistor PM3 and the NMOS transistor NM4 are turned on, and the PMOS transistor PM4 and the NMOS transistor NM3 are turned on to repeat the series resonance. The type converter 123 generates first power that is AC power, and the generated first power is applied to the central coil 131 to transmit power to the power receiving device 200.

At this time, immediately after the PMOS transistor PM3 and the NMOS transistor NM4 are switched from the on state to the off state, the PMOS transistor PM4 and the NMOS transistor NM3 are turned from the off state to the on state. When switching, the PMOS transistor PM3 and the NMOS transistor NM3 may be turned on at the same time, or the PMOS transistor PM4 and the NMOS transistor NM4 may be turned on at the same time and may be damaged. .

Therefore, in the present invention, the PMOS transistor PM3 and the NMOS transistor NM4 are turned off and then the PMOS transistor PM4 and the NMOS transistor NM3 are turned on or the PMOS transistor PM3 and the NMOS transistor NM4 are turned off. Dead time preset when the PMOS transistor PM3 and the NMOS transistor NM4 are turned on after the MOS transistor PM4 and the NMOS transistor NM3 are turned off. ), It is preferable to prevent the PMOS transistor PM3 and the NMOS transistor NM3 from turning on at the same time or the PMOS transistor PM4 and the NMOS transistor NM4 from turning on at the same time. Do.

The PMOS transistor PM1 and the NMOS transistor NM2 of the series resonant converter 123 are turned on according to the drive signals A11 to A14 output from the drive driver 123, and the PMOS transistor PM2 is turned on. ) And when the NMOS transistor NM1 is turned off, the operating power of the power supply terminal Vcc is the PMOS transistor PM1, the capacitor C2, the coil L2, the first switching unit 125, and the first switching unit 125. The first side coil 133 and the NMOS transistor NM2 flow sequentially. In addition, the PMOS transistor PM1 and the NMOS transistor NM2 of the series resonant converter 123 are turned off in response to the driving signals A11 to A14 output by the driving driver 123, and the PMOS transistor ( When the PM2 and the NMOS transistor NM1 are turned on, the operating power of the power supply terminal Vcc is the PMOS transistor PM2, the first side coil 133, the first switching unit 125, and the coil ( L2), the capacitor C2, and the NMOS transistor NM2 flow sequentially.

As described above, the PMOS transistor PM1 and the NMOS transistor NM2 are turned on, and the PMOS transistor PM2 and the NMOS transistor NM1 are turned on to repeat the series resonance. The type converter 123 generates a second power that is AC power, and the generated second power is applied to the first side coil 133 to transmit power to the power receiver 200.

Here, the above operation is described on the assumption that the first switching unit 125 is in a connected state, and the second switching unit 126 is in a blocking state. The first switching unit 125 is in a blocking state, and the first switching unit 125 is in a blocking state. When the second switching unit 126 is in a connected state, second power is applied to the second side coil 135 instead of the first side coil 133 to transmit power to the power receiver 200.

As described above, in transmitting power to the power receiving device 200, the central coil 131 and the first side coil 133 may be selected to transmit power to the power receiving device 200.

In this case, it is preferable that the central coil 131 and the first side coil 133 transmit power with a phase difference of 180 ° between each other.

To this end, when the driving driver 122 generates all of the driving signals A11 to A14 (A21 to A24), the driving signals A11 to A14 and the driving signals A21 to A24 have a phase difference of 180 ° between each other. And the central coil 131 and the first side coil 133 transmit power having a phase difference of 180 ° to each other.

In addition, even when the central coil 131 and the second side coil 135 are selected to transmit power to the power receiver 200, the central coil 131 and the second side coil 135 are also 180 ° from each other. It is desirable to transmit power with a phase difference of

FIG. 6 is an exploded perspective view showing main components of the core assembly 130 in the wireless power transmitter 100 of the present invention, and FIG. 7 is an assembly of the core assembly 130 in the wireless power transmitter 100 of the present invention. Perspective view. 6 and 7, the core assembly 130 of the present invention includes one central coil 131 and two side coils 133 and 135, a core 400, and a circuit board 410. do.

The one central coil 131 and the two side coils 133 and 135 are wound in the same direction. 6 and 7 illustrate that one central coil 131 and two side coils 133 and 135 are entirely wound in a track shape (square), the central coil 131 and The two side coils 133 and 135 may be wound in an elliptical form.

Although not shown in the drawing, even when the first side coil 133 and the second side coil 135 are wound in a rectangular shape, the central coil 131 may be wound in a track shape. . In this case, the central coil 131 wound in a track shape increases the positional freedom of the power receiving device 200.

The central coil 131, the first side coil 133, and the second side coil 135 may have a Litz type, USTC wire, or UEW (poly-Urethane) in which a plurality of strands of wires are twisted. Various types of wires can be used, including enamelled wire (PEW), polyurethane enamelled wire (PEW), and triple insulated wire (TIW).

Looking at the positional relationship between the one central coil 131 and the two side coils 133, 135, the first side coil 133 and the second side coil 135 is disposed below, the central coil 131 is positioned above the first side coil 133 and the second side coil 135. Accordingly, when the central coil 131 is located at the first level, the first side coil 133 and the second side coil 135 are different from the first level, specifically, the first level. Rather, it can be said to be located at a lower second level. According to this arrangement, a portion of each of the first side coil 133 and the second side coil 135 overlaps with the central coil 131 so as not to be exposed to the outside.

The core 400 has a magnetic material, and accommodates the one central coil 131 and the two side coils 133 and 135. The core 400 may be formed in a plate shape in shape. In an embodiment of the invention, the core 40O is illustrated as forming a generally cuboid. Specifically, the core 400 is formed in a rectangular parallelepiped shape, and four corners form a rounded shape.

The circuit board 410 is disposed below the core 40O to face the bottom of the core 40O. In addition, the circuit board 410 has an area larger than that of the core 400, and a portion 411 of the circuit board 410 supports the core 40O from below. In addition, the other portion 413 (see FIG. 6) of the circuit board 410 is configured to supply power to the central coil 131, the first side coil 133, and the second side coil 135. Components of the power transmission unit 120 may be arranged.

In addition, one or more shielding or insulating layers (not shown) may be provided between the circuit board 410 and the core 400. The shielding layer or the insulating layer is formed by the magnetic field generated by the central coil 131, the first side coil 133, and the second side coil 135, and is disposed on the circuit board 410. The transmission unit 120 is reduced to be affected.

The configuration of the core assembly 130 of the present invention will be described in more detail.

The core assembly 130 of the present invention includes one central coil 131 and two side coils 133 and 135 having different sizes (areas) from the central coil 131. In the embodiment of the present invention, the one central coil 131 has a smaller size than each of the first side coil 133 and the second side coil 135, and is disposed on top of the side coils 133 and 135. Located. In addition, the one central coil 131 may have the same size as or larger than each of the first side coil 133 and the second side coil 135 as necessary.

The central coil 131 has two ends 131a and 131b, and each of the first side coil 133 and the second side coil 135 has two ends 133a and 133b and 135a, respectively. , 135b).

A concave recess 401 is formed on a main surface of the core 400 provided in the core assembly 130 to accommodate the central coil 131 and the side coils 133 and 135. The recess 401 is defined by sidewalls 401a protruding upward along the outer circumference of the core 400.

In addition, a plurality of extension grooves 405a, 405b, 407a, 407b, 409a, 409b are formed in the sidewall 401a to communicate the recess 401 with the outside. Both ends 131a and 131b of the central coil 131 extend outside through the extension grooves 405a and 405b and the first side coil 133 through the extension grooves 407a and 407b. Both ends 133a and 133b extend outwardly, and both ends 135a and 135b of the second side coil 135 extend outside through the extension grooves 409a and 409b.

The core 400 is formed of a magnetic material, and includes a power receiving device among magnetic fields generated by electric power supplied to the central coil 131 and the two side coils 133 and 135 accommodated in the recess 401. The magnetic field deviating from the direction toward 200 is shielded.

The recess 401 is recessed to have a closed curve, specifically, a rectangular or elliptical outline. In addition, the size of the concave portion 401 may be such that the outer circumference formed by the central coil 131 and the two side coils 133 and 135 disposed together with each other is somewhat tightly received.

Accordingly, the first side coil 133 and the second side coil 135 may be accommodated in the concave portion 401 of the core 400. It can be fixed at the position set in.

The side wall 401a has a height corresponding to the depth at which the recess 401 is recessed. In addition, the side wall 401a has a height corresponding to the thickness of the sum of the central coil 131 and the two side coils 133 and 135, and the central coil 131 and the two side coils 133 and 135. It can be formed to block or mitigate the magnetic field generated by the power applied to the leakage in the direction toward the side wall (401a).

In addition, as described above, the inner surface of the side wall 401a is in contact with the outer circumferences of the central coil 131 and the two side coils 133 and 135 that are tightly received, so that the central coil 131 and the The two side coils 133 and 135 may be fixed at a fixed position.

Two supports 403a and 403b may protrude from the bottom surface of the recess 401. Each of the two supports 403a and 403b is formed at a position that can be inserted into a hollow provided in the center of the first side coil 133 and the second side coil 135. Accordingly, the two supports 403a and 403b allow the first side coil 133 and the second side coil 135 to be separated from the set position, and the arrangement relationship therebetween can be fixed as set.

The shapes of the supports 403a and 403b may correspond to the shapes of the inner circumferential surfaces of the hollow parts of the side coils 133 and 135. In the embodiment of the present invention, the outer circumference of the support (403a, 403b) has a curved section, corresponding to the inner peripheral surface of the curved hollow portion. Unlike the first side coil 133 and the second side coil 135, the position of the central coil 131 is located above the first side coil 133 and the second side coil 135. It may be determined in a manner that is attached using a double-sided tape.

In addition, a plurality of extension grooves 405a, 405b, 407a, 407b, 409a, 409b are formed in the sidewall 401a to communicate the recess 401 with the outside. The pair of extension grooves 405a and 405b are formed at positions corresponding to both ends 131a and 131b of the central coil 131, and the pair of extension grooves 407a and 407b are formed on the first side surface. It is formed at positions corresponding to both ends 133a and 133b of the coil 133, and the pair of extension grooves 409a and 409b correspond to both ends 135a and 135b of the second side coil 135. It is formed at the position.

The upper surface of the circuit board 410 is disposed to face the lower surface of the core 40O. In addition, six through holes 415 corresponding to the extension grooves 405a, 405b, 407a, 407b, 409a, and 409b are formed along the long side of the circuit board 410. ) Both ends 131a and 131b of the central coil 131 and both ends 133a and 133b of the first side coil 133 and both ends 135a and 135b of the second side coil 135. Each of them is connected to a circuit pattern (not shown in the figure) formed on the bottom surface of the circuit board 170, respectively.

The first side coil 133 and the second side coil 135 may be configured to be in contact with each other as shown in FIG. 8A.

In addition, the first side coil 133 and the second side coil 135 may be spaced apart from each other with a predetermined interval as shown in Figure 8b.

When the first side coil 133 and the second side coil 135 are spaced apart from each other by a predetermined interval between the first side coil 133 and the second side coil 135 The core 400 may be formed to protrude.

In addition, a portion of the first side coil 133 and the second side coil 135 may be disposed to overlap each other as illustrated in FIG. 8C. When a part of the first side coil 133 and the second side coil 135 are disposed to overlap, the core 400 has a stepped portion so that the first side coil 133 and the second side coil ( 135 can be configured to accommodate.

Here, in FIG. 8C, a portion of the first side coil 133 overlaps with the second side coil 135, but the second side coil 133 is overlaid. A portion of the 135 may be configured to overlap.

Next, a relationship between the central coil 131, the first side coil 133, and the second side coil 135 will be described with reference to FIGS. 9 and 10.

9 is a plan view for explaining the concept of the central coil and the side coil provided in the core assembly in the wireless power transmission apparatus of the present invention, Figure 10 is an operation of transmitting power to the power receiving device through the cross-sectional view AA line of FIG. A diagram for explaining. Here, in the drawings of FIGS. 9 and 10, the first side coil 133 and the second side coil 135 are illustrated to be in contact with each other as illustrated in FIG. 8A.

9 and 10, the central coil 131 may be disposed in the transverse direction rather than each of the first side coil 133 and the second side coil 135 along the first direction W ₁ . Have a small width The central coil 131 has the same width as the first side coil 133 and the second side coil 135 along the first direction W ₂ .

Accordingly, portions of the first side coil 133 and the second side coils 135, which are out of the central coil 131, are exposed upward.

Here, the width along the first direction W ₁ of the central coil 131 may be 30 to 50% of the sum of the widths of the first side coil 133 and the second side coil 135.

Unlike the difference in size along the first direction W ₁ , the width of the central coil 131 is along the first side coil 133 and the second side coil along the second direction W ₂ . It may be equal to the width of (135). Furthermore, the first side coil 133 and the second side coil 135 may have the same size. Here, the first direction W ₁ is substantially orthogonal to the second direction W ₂ , and the central coil 131, the first side coil 133, and the second side coils 135 Each may have a generally rectangular shape.

In addition, the side surfaces of the first side coil 133 and the second side coil 135 facing each other may meet each other at a line R passing through the center C of the central coil 131.

According to this configuration, the central coil 131 may be set as a basic coil for transmitting power while being located at the center of the core assembly 130. Accordingly, when the user places the power receiver 200 in the center of the charging station, the power by the central coil 131 may be transmitted to charge the battery cell module 230. When the power receiving device 230 is out of the center of the charging station, the first side coil 133 or the second side coil 135 may assist the central coil 131 to transmit power.

Here, the first side coil 133 and the second side coil 135 are both located at a level just below the central coil 131, whereby the first side coil 133 and the second side coil 135 are located together. All of the side coils 135 are not far from the power receiving device 200. This may reduce the deterioration of the transmission efficiency of power to the power receiving device 200 by the excessively spaced coils.

In addition, when the central coil 131 transmits power to the power receiving device 200 under the control of the power transmission control unit 121 of the present invention, the first side coil 133 and the second side coil 135. At least one of the power supplies may be supplied to transmit power together with the power receiving device 200.

At this time, the magnetic field generated by the first side coil 133 or the second side coil 135 to transmit power reinforces the magnetic field generated by the central coil 131.

Therefore, the power receiving device 200 can receive power uniformly by a uniform magnetic field.

Specifically, FIG. 10 illustrates that the first side coil 133 is supplied with power to supply power to the central coil 131 to transmit power to the power receiving device 200, and thus the first side along with the central coil 131. The coil 133 illustrates a situation in which power is transmitted to the power receiver 200.

The magnetic field density M1 of the central coil 131 decreases from the center C of the central coil 131 toward the end portion thereof. The magnetic field density M2 of the first side coil 133 is also similar to the magnetic field density M2 of the central coil 131.

However, as the magnetic field due to the central coil 131 and the magnetic field due to the first side coil 133 are reinforced with each other, the portion where the central coil 131 and the first side coil 133 overlap with each other is higher. The magnetic field density M3 of the level is satisfied.

In this case, the wireless power transmitter 100 may transfer power to the center coil 131 and the first side coil 133 by 1/2 to transmit power to the power receiving device 200. Thermal stress of the coil 131 and the first side coil 133 may be lowered, and power loss may be reduced.

Next, another modified example of the core assembly 130 will be described with reference to FIG. 11. 11 is an exploded perspective view showing the configuration of another embodiment of the core assembly 130 in the wireless power transmitter 100 of the present invention. Referring to FIG. 11, another embodiment of the present invention is substantially similar to the core assembly 130 of the above-described embodiment, but the first side coil 133 and the second side coil 135 are formed in different shapes. The point is different.

Specifically, a base 500 which is an insulator is further provided below the central coil 131, and each of the first side coil 133 and the second side coils 135 is patterned on the base 500. The first conductive pattern 133-1 and the second conductive pattern 135-1 may be formed. The first conductive pattern 133-1 and the second conductive pattern 135-1 are formed in a planar shape in which a metal strip extends helically.

The first conductive pattern 133-1 and the second conductive pattern 135-1 may be formed at one time through an etching process after a metal plate, for example, copper plate is attached to the base 500. The process of assembling the core assembly 130 can be simplified by forming the first conductive pattern 133-1 and the second conductive pattern 135-1 as a single member using the base 500 as a medium. have. In addition, the core 400 may not require the support 403a, 403b (see FIG. 6).

Further, the first conductive pattern 133-1 and the second conductive pattern 135-1 may be thinner than the first side coil 133 and the second side coil 135.

Therefore, the distance from the center of the thickness direction of the first conductive pattern 133-1 and the second conductive pattern 135-1 to the power receiving device 200 is the first side coil 133 and the second side coil described above. Closer to (135). This has the advantage that the efficiency of the wireless power transmission to the power receiving device 200 is further improved.

Finally, another modified example of the core assembly 130 of the present invention will be described with reference to FIG. 12.

12 is an exploded perspective view showing the configuration of another embodiment of the core assembly 130 in the wireless power transmission apparatus 100 of the present invention. Referring to FIG. 12, another embodiment of the core assembly 130 of the present invention is generally similar to the embodiment shown in FIG. 11, but the central coil 131 may have the first conductive pattern 133-1. And a point disposed below the base 500 on which the second conductive pattern 135-1 is formed.

In this case, since the first conductive pattern 133-1 and the second conductive pattern 135-1 are formed as a pattern on the base 500, the thickness is very thin.

Therefore, when the power receiving device 200 is placed on a charging stand, the distance between the central coil 131 and the power receiving coils 210 of the power receiving device 200 is within an effective distance for transmitting power wirelessly. Can be

The support 403c protrudes from the bottom of the core 400 in correspondence with the central coil 131 disposed under the first conductive pattern 133-1 and the second conductive pattern 135-1. Can be. The support 403c may have a shape corresponding to the hollow portion of the central coil 111 and may be formed at the center of the bottom surface of the recess 410.

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. Will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

100: wireless power transmitter 110: AC / DC converter
120: power transmission unit 121: power transmission control unit
123: drive driver 125: series resonant converter
127: demultiplexer 129: signal receiver
130: core assembly 131: central coil
131a, 131b: end of central coil 133, 135: side coil
133a, 133b, 135a, 135b: end portions of the side coils 133-1, 135-1: conductive pattern
200: power receiving device 210: power receiving coil
220: charging circuit 230: battery cell module
240: power receiving control unit 250: signal transmission unit
400: core 401: recess
401a: side walls 403a, 403b: support
405a, 405b, 407a, 407b, 409a, 409b: extension groove
410: circuit board 500: base
SW1: first switch SW2: second switch

Claims (16)

A core assembly having one central coil and two side coils for transmitting power to the power receiving device; And
When each of the one central coil and the two side coils transmits power, the reception power received by the power receiving device is determined, and which one of the central coil and the two side coils is determined according to the determined received power. One coil is selected as the power transmission coil, or one of the two side coils is selected as the power transmission coil at the same time as the central coil, and power is transmitted to the power receiver through the selected power transmission coil. And a power transmission unit.
The apparatus of claim 1, wherein the power transfer unit comprises:
A power transmission control unit controlling power transmission;
A driving driver generating a driving signal under the control of the power transmission control unit;
A series resonant converter for generating a first power and a second power by switching DC power according to the driving signal, and applying the first power to the central coil;
A side coil driver configured to selectively generate a first side coil driving signal and a second side coil driving signal under the control of the power transmission control unit so that the second power is applied to the first side coil and the second side coil; And
And a signal receiving unit receiving the received power amount signal and the charging completion signal transmitted from the power receiving device, and providing the received power amount signal to the power transmission control unit.
3. The method of claim 2,
First and second switching units selectively connecting the second power to the first side coil and the second side coil while being selectively connected according to the first side coil driving signal and the second side coil driving signal; Wireless power transmission device further comprising.
3. The power supply of claim 2, wherein the first power applied to the central coil and the second power applied to the first side coil or the second side coil;
Wireless power transmitter having a phase difference of 180 ° between each other.
The method of claim 4, wherein
When the series resonant converter generates both the first power and the second power, the phase difference between the driving signal generated by the driving driver and the driving signal for generating the second power is 180 °. Wireless power transmission apparatus so that the first power applied to the central coil and the second power applied to the first side coil and the second side coil have a phase difference of 180 degrees between each other.
The method of claim 1, wherein the core assembly;
A central coil installed at a position of the first level;
A first side coil and a second side coil installed at a second level different from the first level, each part of which is disposed to overlap the central coil; And
And a core of a magnetic material formed to receive the central coil, the first side coil, and the second side coil.
The method of claim 6, wherein the central coil;
The wireless power transmission apparatus is formed to have a different size than each of the first side coil and the second side coil.
8. The method of claim 7, wherein the width along the first direction of the central coil is;
Wireless power transmission apparatus is formed smaller than the width along the first direction of each of the first side coil and the second side coil.
The method of claim 8, wherein the width along the first direction of the central coil;
The wireless power transmission device smaller than the width along the first direction of each of the first side coil and the second side coil.
10. The method of claim 9, wherein the width along the first direction of the central coil is;
And a 30-50% sum of a width along the first direction of each of the first and second side coils.
The method of claim 8, wherein the width along the second direction of the central coil;
And a width equal to a width along the second direction of each of the first and second side coils.
The method of claim 5, wherein the central coil comprises: a central coil;
Wireless power transmission device disposed on the first side coil and the second side coil.
The method of claim 12, wherein the first side coil and the second side coil;
Wireless power transmitter is formed to have the same size.
The method of claim 6, wherein the first side coil and the second side coil;
And a first conductive pattern and a second conductive pattern formed in a pattern on a base which is an insulator disposed below the central coil.
Determining, by the power transmission control unit, one central coil and two side coils one by one and applying power to transmit power to the power receiving device while determining the amount of received power received by the power receiving device; And
The power transmission controller selects any one coil from among one central coil and the two side coils or the one of the two side coils at the same time according to the determined amount of received power. Selecting a side coil of the, and applying power to the selected coil to transmit power to the power receiving device; Wireless power transmission method comprising a.
16. The method of claim 15, further comprising: applying power to the selected coil to transfer power to the power receiving device;
Determining whether the amount of received power received by the power receiving device is reduced;
Determining, by the power transmission controller, power received by the power receiving device while transmitting power to the power receiving device by sequentially applying power to one central coil and two side coils when the amount of received power decreases; And
The power transmission controller selects any one coil from among one central coil and the two side coils or the one of the two side coils at the same time according to the determined amount of received power. Selecting a side coil of the, and transmitting power to the power receiving device by applying power to the selected coil; Wireless power transmission method repeatedly performed.

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