KR101830734B1 - Wireless power transmission method and apparatus - Google Patents

Abstract

A wireless power transmission apparatus according to the present invention includes: a resonance power generation unit that generates resonance power at a predetermined resonance frequency; An induction power generation unit generating a predetermined induction power; A power supply unit for supplying power to at least one of the resonance power generation unit and the induction power generation unit; And a control unit for controlling the resonance power generation unit and the induction power generation unit so that power is generated in at least one of the resonance power generation unit and the induction power generation unit.

Description

[0001] WIRELESS POWER TRANSMISSION METHOD AND APPARATUS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmission method and apparatus, and more particularly, to a wireless power transmission method and apparatus capable of selectively transmitting resonant power according to inductive coupling and resonant coupling schemes according to an inductive coupling scheme.

Almost all household appliances, portable and office appliances and industrial appliances used in everyday life use electric energy supplied by electric power from the power plant. However, the development and widespread use of various portable devices in recent years has shown that the wired power supply is not a suitable power source for portable devices. In the case of a cell phone that has become a necessity for everyday life, it is difficult to charge it easily anywhere when the battery is exhausted, and the use of a LAP TOP computer also increases the capacity and weight of the battery. It is a fact that it is getting attention. Therefore, if energy transfer can be done wirelessly in the office or in the industry, it can be expected that there will be a revolutionary change in economic and industrial aspects.

The wireless power transmission apparatus according to the present invention is intended to be able to charge the wireless power regardless of the type of wireless power if the wireless power receiving apparatus is capable of receiving and charging the wireless power.

According to an aspect of the present invention, there is provided a wireless power transmission apparatus for wirelessly transmitting power according to the present invention, comprising: a resonance power generation unit for generating resonance power at a predetermined resonance frequency; An induction power generation unit generating a predetermined induction power; A power supply unit for supplying power to at least one of the resonance power generation unit and the induction power generation unit; And a control unit for controlling the resonant power generating unit and the inductive power generating unit so that power is generated in at least one of the resonant power generating unit and the inductive power generating unit.

The controller may further include a selection unit that selects one of the resonance power generation unit and the inductive power generation unit, and the control unit may control the selection unit to select any one of the resonance power generation unit and the inductive power generation unit have. The controller determines whether the predetermined external device is capable of charging by the power of the induction power or the resonance power, and selects either the resonance power generation unit or the induction power generation unit So that either the inductive power or the resonant power can be controlled to be transmitted to the external device.

The resonance frequency changing unit may further include a resonance frequency changing unit for changing the resonance frequency of the resonance power generating unit, and the controller may control the resonance frequency changing unit to change the value of the resonance frequency. When the external device is charged with the resonance power, the controller determines a resonance frequency value required for charging the external device, and controls the resonance frequency changing unit according to a result of the determination, And the resonance power generation unit may be controlled to generate the resonance power.

The induction power generation unit may be driven by the resonance power generated by the resonance power generation unit.

The induction power generation unit and the resonance power generation unit may be separately powered by the power supply unit.

The control unit may further include a communication unit for communicating with the external device, wherein the control unit controls the communication unit to output a request signal for identifying whether there is an external device that requires charging periodically, The control unit controls the communication unit to further output a charge request signal for requesting charge related information necessary for charging the external device when a response signal to the external device is received, It is possible to control at least one of the induction power generation unit and the resonance power generation unit based on the received signal. Wherein the communication unit for communicating with the external device is included in the resonance coil of the resonance power generation unit and the induction coil of the induction power generation unit and the control unit outputs a request signal for identifying whether there is an external device periodically required to be charged The control unit controls the communication unit to further output a charging request signal for requesting charging related information necessary for charging the external device when a response signal to the request signal is received from the external device, And a controller for controlling at least one of the inductive power generating unit and the resonant power generating unit based on the received signal when the signal for the charging related information is received from the external apparatus.

According to another aspect of the present invention, there is provided a wireless power transmission method for wirelessly transmitting power according to the present invention, comprising the steps of: determining whether to generate either resonant power or inductive power; Generating at least one of the resonance power and the induction power according to a determination result; And outputting at least one of the generated resonant power and the induced power.

Here, the method may further include outputting an identification request signal for identifying whether there is an external device that requires periodic charging. The method further includes outputting a type request signal for requesting a type of power for charging the external device when a response signal for the identification request signal is received from the external device, The resonant power and the induced power.

And outputting a signal for requesting charging related information for charging the external device when a response signal for the identification request signal is received from the external device, And the step of controlling the resonance power to correspond to the resonance frequency value.

The wireless power transmission apparatus according to the present invention selectively transmits resonant power according to inductive coupling and resonant coupling schemes according to an inductive coupling scheme to a wireless power receiving apparatus, Regardless of whether it is an inductive coupling method or a resonant coupling method.

FIG. 1A is a block diagram of a wireless power transmission apparatus according to an embodiment of the present invention.
1B is a block diagram of a wireless power transmission apparatus according to an embodiment of the present invention.
2 is a block diagram of a wireless power transmission apparatus and a wireless power reception apparatus for receiving wireless power from a wireless power transmission apparatus according to an embodiment of the present invention.
3 is a simplified circuit diagram of a resonant power generating unit and a power supply unit of a wireless power transmission apparatus according to the present invention and a simplified circuit diagram of a wireless power receiving apparatus that receives a resonant power supply.
4A and 4B are views showing a resonance coil and an induction coil according to an embodiment of the present invention.
5 is a simplified control flowchart of a wireless power transmission apparatus according to an embodiment of the present invention.
6 is a flowchart illustrating a control flow between a wireless power transmission apparatus and a wireless power reception apparatus according to an embodiment of the present invention.
7 is a diagram illustrating an embodiment in which a wireless power transmission apparatus according to the present invention is used as a power repeater.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

Although the terms used in the present invention are selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in specific cases. In this case, since the meaning is described in detail in the description part of the present invention, The present invention should be grasped as a meaning of the term.

Hereinafter, embodiments of a power transmission apparatus for transmitting power wirelessly constituting the present invention will be described in detail. In the drawings, the same reference numerals as possible are used to denote the same or similar components, even if they are shown in different drawings.

A wireless power transmission system (Wilreless Power Transmission System) according to an embodiment of the present invention is a system that can supply power wirelessly between devices that are not connected to a line for directly supplying power, A method of generating power and a method of generating resonance power by a resonance coupling method.

According to the inductive coupling method, when the intensity of the current flowing through the primary coil of two adjacent coils is changed, the magnetic field is changed by the current, so that the magnetic flux passing through the secondary coil is changed, Induced electromotive force is generated. That is, according to this method, inducing electromotive force is generated when only the current of the primary coil is changed while keeping the two coils close to each other without moving the two conductors spatially. In this case, the frequency characteristics are not greatly affected, but the power efficiency is affected by the alignment and the distance between the power transmission apparatuses including the coils and the power reception apparatuses.

On the other hand, according to the resonance coupling method, a resonance frequency is applied to the primary coil of the two coils, and a part of the generated magnetic field variation is applied to the secondary coil having the same resonance frequency to induce an induced electromotive force in the secondary coil do. That is, according to this method, when the transmitting / receiving apparatus resonates at the same frequency, the electromagnetic waves are transmitted through the near-field electromagnetic field. In this case, the frequency characteristics are greatly affected, but the arrangement and distance between the transmitting device and the receiving device including each coil have a less influence on the power efficiency as compared with the inductive coupling method.

Hereinafter, a method for efficiently transmitting wireless power in a wireless power transmission system according to a resonant coupling scheme will be described in detail. In particular, as shown in Equation 1 below, according to the resonance coupling method, inductance (L) determined by the interval d, the length, and the number of rotations of the coils constituting the transmitting apparatus and the receiving apparatus of the wireless power transmission system The resonance frequency f is determined according to the value of the capacitance C determined by the distance between the coil and the coil and the area of the coil.

FIG. 1A is a block diagram of a wireless power transmission apparatus 100 according to an embodiment of the present invention.

1A, the wireless power transmission apparatus 100 may include a resonance power generation unit 130, an inductive power generation unit 150, a power supply unit 110, and a control unit 170.

The resonance power generation unit 130 may generate resonance power having a predetermined resonance frequency, output the generated resonance power to an external power reception device, and charge the external power reception device by resonance power. The resonance power generating unit 130 generates a resonance power having a predetermined resonance frequency by the above-described resonance coupling method, and includes a resonance coil and a resonance capacitor not shown for this purpose. Then, the resonance coil can operate as the primary coil.

The inductive power generation unit 150 generates inductive power and outputs the generated inductive power to an external power receiving apparatus. Therefore, the external power receiving apparatus can be charged by the inductive power. The induction power generating unit 150 generates induction power by the above-described inductively coupled method and thus includes an induction coil. Here, the induction coil operates as the above-mentioned primary coil, and the external wireless power receiving device to be charged by the induced electromotive force also includes a coil, which operates as the above-described secondary coil.

The power supply unit 110 supplies power to the resonance power generation unit 130 and the induction power generation unit 150, respectively. It is needless to say that a separate power supply unit 110 may be provided to supply power to the resonance power generation unit 130 and the induction power generation unit 150 although the power supply unit 110 is shown as one unit.

The controller 170 controls each component included in the wireless power transmission apparatus 100.

1B is a block diagram of a wireless power transmission apparatus 100 according to another embodiment of the present invention.

1B, the wireless power transmission apparatus 100 may include a resonant power generation unit 130, an inductive power generation unit 150, a power supply unit 110, and a control unit 170. The resonance power generation unit 130 and the induction power generation unit 150 have the same functions as those in FIG. 1A, and a description thereof will be omitted.

However, the power supply unit 110 supplies power to the resonance power generation unit 130 only. The induction power generation unit 150 can receive power from the resonance coil of the resonance power generation unit 130. For example, an induced electromotive force may be generated in the primary coil of the induction power generating unit 150, that is, the induction coil, depending on the change of the magnetic flux of the resonance coil. Based on the induced electromotive force, Power can be generated to generate an induced electromotive force in an external secondary coil. Alternatively, when the resonance frequency between the coil and the capacitor is equal to the resonance frequency of the resonance coil, the induced power generating unit 150 applies the resonance power to the induced power generating unit 150, Accordingly, power is applied to the primary coil of the inductive power generating unit 150, so that the secondary coil and the induced electromotive force can be generated.

In addition, according to an embodiment of the present invention, the coil of the inductive power generation unit 150 may be disposed so as to be at least partially surrounded by the resonance coil as shown in FIGS. 4A and 4B, Can be supplied. Here, the coil of the inductive power generating unit 150 for receiving power by the resonant coil may be a primary coil for transmitting an induced electromotive force to an external secondary coil. However, it is needless to say that the induction power generation unit 150 may further include a separate coil for receiving power by the resonance coil.

2 is a block diagram of a wireless power transmission apparatus 100 and a wireless power reception apparatus for receiving wireless power from a wireless power transmission apparatus 100 according to an embodiment of the present invention.

The wireless power transmission apparatus 100 includes a resonance power generation unit 130, an inductive power generation unit 150, a power supply unit 110, and a control unit 170, as described with reference to FIGS. 1A and 1B. The wireless power transmission apparatus 100 further includes a selection unit 120 for selecting one of the resonance power generation unit 130 and the induction power generation unit 150. [

The resonance power generation unit 130 includes a resonance power generation unit 135 including a resonance capacitor and a resonance coil and a first resonance power generation unit 135 for modulating and demodulating a signal applied to the resonance power generation unit 135, And a signal processing unit 131. Here, the first signal processing unit 131 may further include a resonance frequency changing unit for changing the resonance frequency value of the resonance power generating unit 135.

The induction power generation unit 150 includes an induction power generation unit 155 including an induction coil. The induction power generation unit 150 may further include a second signal processing unit 151 for processing a signal, such as modulating / demodulating a signal applied to the induction power generation unit 155.

The controller 170 controls each component included in the wireless power transmission apparatus 100. That is, the control unit 170 may control the resonance power generation unit 130 and / or the inductive power generation unit 150 to generate the resonance power and / or the induction power, respectively. The control unit 170 may control the selection unit 120 to select either the resonance power generation unit 130 or the inductive power generation unit 150. That is, the control unit 170 can select the selection unit 120 to supply power only to the resonance power generation unit 130 and the induction power generation unit 150 in the power supply unit 110 as shown in FIG. The control unit 170 determines whether a predetermined external device can be charged by the inductive power or the resonant power and outputs the generated power to the resonant power generation unit 130 or the inductive power generation unit 150 So that either the inductive power or the resonant power can be controlled to be transmitted to the external device. In addition, the controller 170 can control the resonance frequency changing unit to change the value of the resonance frequency. Here, the control unit 170 may include at least one of a microcomputer and a digital seeker processor for controlling each component of the wireless power transmission apparatus 100.

Specifically, the controller 170 of the wireless power transmission apparatus 100 can transmit an inquiry signal periodically or non-periodically to determine whether there is a wireless power receiving apparatus that requires external charging. In this case, when the wireless power receiving apparatus transmits a response signal to the request signal, the controller 170 determines whether the wireless power receiving apparatus is a device that is charged by resonance power or a device that is charged by induced power The control unit 170 may request the wireless power receiving apparatus to determine the ID of the wireless power receiving apparatus based on the ID information received from the wireless power receiving apparatus, And determines which of the generating units 150 is to be driven. The control unit 170 may control the selection unit 120 according to the result. Here, the ID information means information necessary for charging the wireless power receiving apparatus. That is, the identity information includes information on the type of wireless power that can charge the wireless power receiving device, and the type of wireless power includes at least the resonant power and the induced power. The ID information may include an ID of the wireless power receiving apparatus, a resonance frequency value required when the antenna is charged with the resonance power, an amount of power required to be charged, and the like.

In an embodiment of the present invention, the wireless power transmission apparatus 100 according to the present invention includes a separate communication unit 180 to transmit the request signal and the ID information request signal to the wireless power receiving apparatus, It is possible to receive the ID information, the response signal, and the like from the apparatus. Here, the communication unit 180 may transmit and receive a signal by using the Bluetooth communication protocol including the Bluetooth unit.

In another embodiment of the present invention, the wireless power transmission apparatus 100 according to the present invention does not include a separate communication unit 180 and includes a request signal and an ID information request signal in the above-described inductive power signal and the resonant power signal The inductive power generating unit 150 and the resonant power generating unit 130 to the wireless power receiving apparatus. Here, the request signal, the ID information request signal, and the like may be modulated in the first signal processing unit 131 and the second signal processing unit 151. The inductive power generating unit 150 and the resonant power generating unit 130 may receive the ID information and the response signal from the wireless power receiving apparatus and may include the first signal processing unit 131 and the second signal processing unit 151, And transmits the demodulated signals to the control unit 170. [0050] FIG. That is, the resonance coil of the resonance power generation unit 135 and the induction coil of the induction power generation unit 155 can receive signals from the wireless power reception apparatus, respectively. In this case, the communication unit 180 of FIG. 2 does not need to be included in the wireless power transmission apparatus 100.

3 is a simplified circuit diagram of the resonance power generation unit 130 and the power supply unit 110 of the wireless power transmission apparatus 100 according to the present invention and a simplified circuit diagram of a wireless power reception apparatus that receives the resonance power.

값을 갖고 공진 커패시터가

값을 갖는 경우 이를 수학식 1에 대입하면 공진주파수 값을 구할 수 있다. 또한, 공진전력수신장치(200)의 공진코일 및 공진커패시터에 의한 공진주파수 값 역시 동일한 경우 공진전력전송장치의 공진코일과 공진전력수신장치(200)의 공진코일의 거리가 유도전력에 따른 1차코일 및 2차코일에 비하여 거리가 멀고 배열이 어긋나 있어도 공진전력이 전송될 수 있다.The resonance frequency is determined according to the values of the resonance coil and the resonance capacitor of the resonance power generation unit 135 as described above. Therefore,

Value and the resonant capacitor

Value, it is possible to obtain the resonance frequency value by substituting it into the equation (1). When the resonance frequency of the resonance power receiving apparatus 200 is also equal to the resonance frequency of the resonance coil, the resonance coil of the resonance power transmitting apparatus and the resonance coil of the resonance power receiving apparatus 200 are spaced apart from each other, The resonance power can be transmitted even if the distance is long and the arrangement is shifted as compared with the coil and the secondary coil.

4A and 4B are views showing a resonance coil and an induction coil according to an embodiment of the present invention. 4A and 4B, the resonance coil according to the present invention may be arranged on the outer periphery of the induction coil to surround the induction coil, thereby reducing the space occupied by the coils. Also, the induction coil according to the present invention may be replaced by other components if the magnetic flux can be collected, not by a coil. For example, the induction coil may comprise ferrite.

The near magnetic field between the coils can be controlled by implementing a shield composed of a material having a high magnetic permeability or a non-conductive material around at least one coil.

The control unit 170 according to the present invention can change the value of the resonance frequency by controlling the resonance frequency changing unit to change the interval of the coils. According to an embodiment of the present invention, the resonance frequency changing unit may include a motor for rotating or moving the coil. That is, the rotation motor located at the center of the resonance coil may be rotated clockwise or counterclockwise, or the linear motor located at the end of the resonance coil may be moved in balance to change the interval of the coils.

5 is a simplified control flow diagram of a wireless power transmission apparatus 100 according to an embodiment of the present invention.

The controller 170 of the wireless power transmission apparatus 100 determines whether it is necessary to generate wireless power (S110). At this time, the determination as to whether or not the wireless power needs to be generated is determined through communication with an external wireless power receiving apparatus, which will be described in detail with reference to FIG. If it is determined that the wireless power needs to be generated, the controller 170 determines whether the required wireless power is resonance power or induced power (S130). If it is determined that the resonant power is required (S130), the controller 170 controls the resonant power generator 130 to generate the resonant power (S155). At this time, the controller 170 may control the selection unit 120 to supply only the resonance power generation unit 130 with power. The control unit 170 controls the resonance frequency of the resonance power generating unit 130 and the resonance frequency of the resonance frequency of the resonance power generating unit 130 according to the present invention. The value of the frequency is further determined (S151). The controller 170 adjusts the resonance frequency changing unit to have a required resonance frequency value (S153), generates resonance power of the adjusted resonance frequency, and controls the resonance power generating unit 130 to output the resonance power to the wireless power receiving apparatus S155).

If it is determined in step S130 that the inductive power is required, the controller 170 controls the inductive power generator 150 to generate and output inductive power to the inductive power receiver 300 (step S170) . At this time, the controller 170 may control the selection unit 120 to supply only the inductive power generation unit 150 with power.

6 is a flowchart illustrating a control flow between a wireless power transmission apparatus 100 and a wireless power reception apparatus according to an embodiment of the present invention.

The wireless power transmission apparatus 100 according to the present invention outputs a request signal to search for whether there is a wireless power receiving apparatus that requires external charging periodically or aperiodically (S210). At this time, when receiving the request signal, the wireless power receiving apparatus outputs a response signal to the wireless power transmission apparatus 100 in response to the request signal (S310). The wireless power transmission apparatus 100 determines whether the wireless power transmission apparatus 100 needs to be charged when a response signal is received, and determines the type of wireless power that can charge the wireless power reception apparatus, that is, And requests the wireless power receiving apparatus for information necessary for charging, such as whether the required resonance frequency value is required when it is charged with electric power. Hereinafter, the information necessary for charging is collectively referred to as " ID information ". That is, the wireless power transmission apparatus 100 transmits an ID information request signal to the wireless power receiving apparatus (S230). Then, the wireless power receiving apparatus transmits the ID information requested by the ID information request signal to the wireless power transmission apparatus 100 (S330). The controller 170 of the wireless power transmission apparatus 100 determines whether to generate wireless power based on the ID information. If it is determined that wireless power needs to be generated, the controller 170 of the wireless power transmission apparatus 100 generates the resonance power generation unit 130 and the inductive power generation (150) to be driven. If it is determined that it is necessary to generate the resonance power to charge the wireless power receiving apparatus (S250), the controller 170 generates the resonance power by driving the resonance power generation unit 130 (S271) So that the resonant power is transmitted to the wireless power receiving apparatus (S273). If it is determined that it is necessary to generate inductive power to charge the wireless power receiving apparatus (S250), the controller 170 generates the inductive power by driving the inductive power generating unit 150 (S281) So that the induced power is transmitted to the wireless power receiving apparatus (S283). When at least one of the inductive power and the resonant power is received, the wireless power receiving apparatus starts charging by the received wireless power (S350). When charging of the wireless power receiving apparatus is completed (S370), the wireless power receiving apparatus transmits a notification signal to the wireless power transmitting apparatus 100 indicating that the charging is completed (S390). When the notification signal is received, the wireless power transmission apparatus 100 terminates the operation of the resonance power generation unit 130 or the induction power generation unit 150 (S290).

7 is a diagram illustrating an embodiment in which the wireless power transmission apparatus 100 according to the present invention is used as a power repeater.

According to an embodiment of the present invention, the first wireless power transmission apparatus 100a may include only one of the resonant power generation unit 130 and the inductive power generation unit 150. [ For example, the first wireless power transmission apparatus 100a includes a resonant power generation unit 130 and outputs resonance power according to resonance coupling. The wireless power reception apparatus 500 is a device that can be charged Device. In this case, the second wireless power transmission apparatus 100b may convert the resonant power received from the first wireless power transmission apparatus 100a into inductive power and transmit the inductive power to the wireless power receiving apparatus 500. [ That is, when the resonance coil of the second wireless power transmission apparatus 100b receives the resonance power from the first wireless power transmission apparatus 100a, that is, the resonance magnetic field, and resonance occurs in the resonance coil according to the resonance power, Power is received in the coil so that the induction coil operates as the first coil as described above and the coil of the wireless power receiving apparatus 500 operates as the second coil to generate induced electromotive force. Here, it is preferable that resonant power is received from the first wireless power transmission apparatus 100a to the resonant coil, but a separate receiving coil may be provided.

When the inductive power is generated in the first wireless power transmission apparatus 100a and the wireless power receiving apparatus 500 can be charged by the resonant power in the same principle, the second wireless power transmission apparatus 100b receives the inductive power Accordingly, the resonant power of the resonant coil of the resonant power generating unit 130 may be generated and transmitted to the wireless power receiving apparatus 500.

Here, the first wireless power transmission apparatus 100a includes only one of the resonant power generation unit 130 and the inductive power generation unit 150. However, the first wireless power transmission apparatus 100a may include the resonant power generation unit 130, It is of course possible to operate in the same manner when both the generating unit 130 and the inductive power generating unit 150 are included.

When the wireless power transmission apparatus 100 according to the present invention plays the role of a repeater, even when the wireless power reception apparatus 500 is located beyond the chargeable distance by the resonance power, the wireless power transmission apparatus 100 There is an effect that a new wireless power transmission apparatus 100 may be further added between the wireless power receiving apparatuses 500 to further widen the chargeable distance. Also, even when the transmission method of the wireless power that can be transmitted from the first wireless power transmission apparatus 100a, that is, the resonant coupling method or the inductive coupling method is different from that of the wireless power receiving apparatus 500, The battery 500 can be charged.

As described above, the wireless power transmission apparatus 100 according to the present invention selectively transmits the inductive power according to the inductive coupling method and the resonant power according to the resonance coupling method to the wireless power receiving apparatus 500 It is possible to charge the wireless power receiving apparatus 500 regardless of whether the charging method of the wireless power receiving apparatus 500 is the inductive coupling method or the resonant coupling method.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

Claims (13)

1. A wireless power transmission apparatus for wirelessly transmitting power,
A resonance power generation unit that generates resonance power at a predetermined resonance frequency;
An induction power generation unit generating a predetermined induction power;
A power supply unit for supplying power to at least one of the resonance power generation unit and the induction power generation unit;
Wherein the control unit controls the resonant power generation unit and the inductive power generation unit to generate power in at least one of the resonant power generation unit and the inductive power generation unit, requests ID information from an external device, And a control unit for receiving the ID information from the device and selectively transmitting either the inductive power or the resonant power to the external device based on the received ID information,
Wherein the ID information includes information on a type of wireless power that the external device can receive. The method according to claim 1,
Further comprising a selection unit for selecting one of the resonance power generation unit and the inductive power generation unit,
Wherein the control unit controls the selection unit to select any one of the resonance power generation unit and the inductive power generation unit. delete 3. The method of claim 2,
Further comprising a resonance frequency changing unit for changing the resonance frequency of the resonance power generating unit,
Wherein the control unit controls the resonance frequency changing unit to change the value of the resonance frequency. 5. The method of claim 4,
Wherein the control unit determines the resonance frequency value necessary for charging the external device when the external device is charged by the resonance power and controls the resonance frequency changing unit according to a result of the determination, And controls the resonant power generation unit to generate power. 3. The method according to claim 1 or 2,
Wherein the induction power generation unit is driven by the resonance power generated by the resonance power generation unit. 3. The method according to claim 1 or 2,
Wherein the induction power generation unit and the resonance power generation unit are separately powered by the power supply unit. The method according to claim 1,
Further comprising a communication unit for communicating with the external device,
Wherein the control unit controls the communication unit to output a request signal to identify whether there is an external device that needs to be periodically charged, and when the response signal to the request signal is received from the external device, Related information from the external device, and controls the communication unit to further output a charging request signal for requesting charging-related information necessary for charging the battery, Generating unit for controlling the power of the wireless power transmission apparatus. 9. The method of claim 8,
Wherein the communication unit for communicating with the external device is included in the resonance coil of the resonance power generation unit and the induction coil of the induction power generation unit,
Wherein the control unit controls the communication unit to output a request signal to identify whether there is an external device that needs to be periodically charged, and when the response signal to the request signal is received from the external device, Related information from the external device, and controls the communication unit to further output a charging request signal for requesting charging-related information necessary for charging the battery, Generating unit for controlling the power of the wireless power transmission apparatus. delete delete delete delete

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