KR20180128371A - Apparatus and method for controlling wireless power transmission - Google Patents

Abstract

The present invention relates to a wireless charging device, which comprises: a contactless short-range wireless communication unit for performing a contactless short-range wireless communication for wireless charging with a wireless power transmitter through a contactless short-range wireless communication antenna to perform a wireless charging authentication; a wireless power receiving unit for receiving supplied power from the wireless power transmitter using a resonator resonating at the same resonance frequency of the wireless power transmitter as the wireless charging authentication is performed; a charging control unit for performing the wireless charging using power received by the wireless power receiving unit; and at least one switch for performing switching, which performs any one of connection of the contactless short-range wireless communication antenna and the contactless short-range wireless communication unit, and connection of the wireless power receiving unit and the charging control unit. According to the present invention, the number of required connection terminals is reduced and a circuit configuration can be simplified by performing connection using a small number of connection terminals, such as a pair of connection terminals in case of using a method that a part of components for the wireless charging is physically divided to be connected by connection terminals.

Description

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

The present invention relates to a wireless charging apparatus and method, and more particularly, to a wireless charging apparatus and method for controlling wireless power transmission through a contactless short-range wireless communication channel.

With the development of IT technology and the increasing availability and spread of various portable electronic products, a variety of technologies are being developed to provide electric power for portable electronic products. In particular, in the past, a technique of receiving power using a power line has been mainly used, but in recent years, wireless power transmission technology capable of supplying power wirelessly has been actively developed.

Wireless power transmission technology is a technology that transfers electric energy in the form of electromagnetic wave, electromagnetic induction or electromagnetic resonance. It is a technology that can supply electric power anytime and anywhere wirelessly without power line such as electric wire. This wireless power transmission technology is a core technology for wireless charging of electronic devices, wireless power supply for electric vehicles, wireless charging, remote wireless power supply, ubiquitous wireless sensor power supply, etc., and replaces power supply and charging method through existing wires It is attracting attention as a technology that can be done.

In a case where the wireless power transmission technique described above is used in a wireless charging device, for example, the wireless charging device may comprise a wireless power transmitter for supplying power and a wireless power receiver for charging the battery with power have. The wireless power transmitter measures the change value of the load or the change of the resonance frequency in the wireless charging waiting state and detects whether the object is placed on the source resonance part. Then, when an object is detected, the power transmitter transmits electric power required for charging to supply electric power to the object, and confirms whether the object for wireless charging is another metallic object through an authentication process such as object and ID exchange. When the authentication is successful, the wireless power transmitter determines the object placed in the source resonance part as a wireless rechargeable charger, i.e., a wireless power receiver, to negotiate the power transmission. And the wireless power transmitter then checks whether the wireless power receiver is buffered and stops transmitting power to the wireless power receiver when the buffer is full.

The wireless power transmitter and the wireless power receiver perform the wireless power transmission control through communication, and the communication method uses an in-band communication method or an out-of-band communication method . The in-band communication scheme is a scheme for performing wireless power transmission control using a power supply frequency band and a communication frequency band as the same frequency band between a wireless power transmitter and a wireless power receiver. Out-of- And the power supply frequency band and the communication frequency band are used as different frequency bands among the power receiving devices to perform wireless power transmission control.

Such a wireless charging apparatus has been recently applied to portable electronic apparatuses, and various components and circuit arrangements have been used in order to reduce the size of components and increase the performance thereof.

For example, a wireless charging device is applied to a portable terminal that receives power from the charging pad to perform battery charging, and the portable terminal is configured to reduce the size of components for wireless charging, Some of the components for the portable terminal may be disposed inside the portable terminal and the remaining components may be connected to the external terminal through the connection terminal.

For example, FIG. 1 shows a portable terminal to which a wireless charging device is applied according to the prior art. Referring to FIG. 1, reference numeral 10 denotes a main body of the portable terminal, and reference numeral 20 denotes an external battery cover of the portable terminal. When the wireless charging device is applied to a portable terminal, some components (not shown) for wireless charging are included in the main body 10 and the remaining components 22 for wireless charging are connected to the external battery cover 20 And the wireless charging device component located at the body 10 and the wireless charging device component located at the battery cover 20 are connected to each other via wireless charging connection terminals such as 11 and 21, .

In addition to the components for wireless charging, components for other functions may be separately disposed in the main body 10 and the battery cover 20 in the portable terminal. For example, the components 26 for noncontact local area communication are separately arranged in the main body 10 and in a part of the outer battery cover 20, and connection terminals for noncontact local communication such as 15 and 25 There may be cases where components for non-contact short-range communication are made to operate.

In the case where the connection terminals 11, 21, 15, and 25 for performing the wireless charging and performing the non-contact short distance communication exist respectively in the portable terminal, a large number of connection terminals are required in manufacturing the portable terminal.

Also, when the communication components for the wireless power transmission and the components for the non-contact short distance communication exist in a redundant manner, a plurality of communication components are required, which may result in inefficient and wasted resources.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a wireless charging device and a wireless charging device that enable wireless charging and noncontact local communication through a pair of connection terminals using switches when a plurality of connection terminals for performing wireless charging and performing non- Method.

It is another object of the present invention to provide a wireless charging apparatus and method that does not require a separate communication module for performing wireless charging by performing wireless power transmission control for wireless charging using noncontact local area communication.

According to another aspect of the present invention, there is provided a wireless charging apparatus including a contactless short-range wireless communication unit performing wireless contactless short-range wireless communication with a wireless power transmitter through a non-contact short- A wireless power receiving unit that receives supply power from the wireless power transmitter using a resonator resonating at the same resonance frequency of the wireless power transmitter as the wireless charging authentication is performed; And at least one switch for performing a connection between the contactless short-range wireless communication antenna and the contactless short-range wireless communication unit and the connection between the wireless power-receiving unit and the charge control unit To do And a gong.

 The present invention also provides a wireless charging method including the steps of transmitting identification information to a wireless power transmitter and requesting authentication in a state in which a contactless short distance wireless communication unit and a non-contact short distance wireless communication antenna are connected, Performing a switching so that a wireless power receiving unit for receiving power and a charging control unit for performing charging using the received wireless power are connected to each other and performing charging using wireless power received through the wireless power receiving unit, .

According to the present invention, when a component for wireless charging is disposed inside a wireless power receiving apparatus and the remaining components are connected through a connection terminal outside the wireless power receiving apparatus, components for wireless charging The other components for performing noncontact local communication are connected by using a pair of connection terminals, so that it is possible to reduce the number of necessary connection terminals and simplify the circuit configuration.

In addition, according to the present invention, wireless power transmission control for wireless charging using noncontact local area communication is performed, so that it is not necessary to provide a separate communication module for performing wireless charging, thereby reducing the implementation cost.

1 shows a portable terminal to which a wireless charging device is applied in the prior art
2 is a block diagram of a wireless charging apparatus according to an embodiment of the present invention.
3 is a flowchart of a wireless charging method according to an embodiment of the present invention.
4 is a diagram illustrating a state in which a charge control unit disposed in a main body and a wireless power receiving unit disposed in a battery cover are connected to each other in a portable terminal according to an embodiment of the present invention;
5 is a view illustrating a state in which a first non-contact short-range wireless communication unit disposed in a main body and a first non-contact short-range wireless communication antenna disposed in a battery cover are connected to each other in a portable terminal according to an embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be appreciated that those skilled in the art will readily observe that certain changes in form and detail may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims. To those of ordinary skill in the art. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The present invention relates to a wireless communication system for performing communication for wireless power transmission control using a non-contact short distance communication between a wireless power transmitter for supplying wireless power and a wireless power receiver for receiving wireless power and performing charging, Disclosed is a wireless charging apparatus and method for connecting some components for charging and remaining components for wireless charging disposed outside by using a pair of connection terminals. Particularly, in the present invention, a non-contact short-range wireless communication method using an NFC (Near Field Communication) communication method will be described as an example. However, the non-contact short-range wireless communication method according to the present invention can use other short-range wireless communication methods such as ZigBee communication, Bluetooth communication, infrared communication, etc. in addition to the NFC method.

Further, the wireless charging apparatus of the present invention can be applied to wireless charging of electronic devices, wireless power supply and charging of electric vehicles, remote wireless power supply, ubiquitous wireless sensor power supply, etc., and performs wireless power transmission and receives wireless power Any device that performs charging by itself can be applied.

In order to facilitate understanding of the present invention, a description will be made of an embodiment in which the wireless power transmission control device is applied to a portable terminal including a main body and a battery cover, and a charging pad.

FIG. 2 is a block diagram of a wireless charging apparatus according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 2, the wireless charging apparatus according to an embodiment of the present invention may include a portable terminal 100 corresponding to a wireless power receiver and a charging pad 200 corresponding to a wireless power transmitter.

First, the charging pad 200 includes a second non-contact short range wireless communication antenna 222, a second non-contact short range wireless communication unit 224, a wireless power transmission unit 226, and a TX resonance unit 228.

The wireless power transmitting unit 226 generates various messages required for wireless power transmission and transmits the generated messages to the portable terminal 100 through the second non-contact short range wireless communication unit 224 and transmits a message received from the portable terminal 100 to the second non- And receives it through the short-range wireless communication unit 224. The wireless power transmission unit 226 calculates the amount of power to be supplied through the TX resonance unit 228 based on the information received from the portable terminal 100 and outputs the calculated amount of power to be transmitted through the TX resonance unit 228 do.

The TX resonance unit 228 includes a resonance coil and resonates at the same frequency as the TX resonance unit 128 of the portable terminal 100 to transmit power to the portable terminal 100 side.

The second non-contact short range wireless communication unit 224 performs non-contact short distance communication with the portable terminal 100 through the second non-contact short range wireless communication antenna 222, for example, NFC communication. The second non-contact local area wireless communication unit 224 transmits a message received from the portable terminal 100 to the wireless power transmitting unit 226 and transmits a message to be transmitted to the wireless terminal 100 from the wireless power transmitting unit 226. [

The portable terminal 100 is a wireless power receiver that wirelessly receives power from the charging pad 200 and charges the portable terminal 100. The portable terminal 100 is physically connected to a main body 110, And a battery cover 120 corresponding to a second area physically separated from the first area.

The main body 110 is provided with a first non-contact short-range wireless communication unit 112, a charge control unit 114, a battery 116, a first switch 111 and a first terminal 119. The battery cover 120 is provided with a first non-contact short range wireless communication antenna 122, a wireless power receiving unit 126, an RX resonance unit 128, a second switch 121 and a second terminal 129.

The first components 112, 114, 116 and 111 for wireless charging arranged in the main body 110 and the second components 122, 126, 128, 121 are connected to each other through the first and second terminals 119, 229 according to the operation of the first switch 111 and the second switch 121, respectively.

Specifically, the first non-contact short range wireless communication unit 112 and the first non-contact short range wireless communication antenna 122 are connected and operated through the first and second terminals 119 and 229 according to the operation of the first switch 111 . The wireless power receiving unit 126 and the charge control unit 114 are connected to each other through the first and second terminals 119 and 229 according to the operation of the second switch 121. At this time, in the initial state (or the idle state), the first and second switches 111 and 121 maintain the state where the first non-contact short range wireless communication unit 112 and the first non-contact short range wireless communication antenna 122 are connected.

The first non-contact short-range wireless communication unit 112 is connected to a first switch (not shown) for communication for wireless charging control, The first non-contact short-range wireless communication unit 112 and the first non-contact short-range wireless communication antenna 122 are connected to each other. The first switch 111 performs a switching operation so that the first non-contact short-range wireless communication unit 112 is connected to the first terminal 119 under the control of the first non-contact local area wireless communication unit 112. The first switch 111 has a first terminal 119 and has one side connected to the non-contact short-distance wireless communication unit 112 and the charging control unit 114, and the other side connected to the first terminal 1119 Contact short range wireless communication unit 112 and the charge control unit 114 and the first terminal 119 in accordance with the control signal of the non-contact short-range wireless communication unit 112. The non-contact short-

The first non-contact short-range wireless communication unit 112 is connected to the first non-contact short-range wireless communication antenna according to the connection of the first terminal 119 and the second terminal 129. The first non-contact short-distance wireless communication unit 112 performs non-contact short-range communication, for example, NFC communication with the charging pad 200 while being connected to the first non-contact short- The first non-contact wireless local area communication unit 112 transmits a message received from the charging pad 200 to the charging control unit 114 and transmits a message to be transmitted from the charging control unit 114 to the charging pad 200. [

 The RX resonance unit 128 resonates at the same frequency as the TX resonance unit 228 of the charging pad 200 including the resonance coil. The wireless power receiving unit 126 controls the second switch 121 so that the wireless power receiving unit 126 and the charge control unit 114 are connected when the power is received through the TX resonance unit 228. [ The second switch 121 performs a switching operation so that the wireless power receiving unit 126 is connected to the second terminal 129 under the control of the wireless power receiving unit 126.

The second switch 121 has a second terminal 129 physically connected to the first terminal 119 and has one side connected to the contactless short distance wireless communication antenna 122 and the wireless power receiving unit 126 Contact wireless local area communication antenna 222 and the wireless power receiving unit 126 and the second terminal 129 in accordance with the control signal of the wireless power receiving unit 126. The second terminal 129 is connected to the second terminal 129, 129 are connected to each other.

The wireless power receiving unit 126 is connected to the charging control unit 114 according to the connection of the second terminal 129 and the first terminal 119. When the wireless power receiving unit 126 is connected to the charging control unit 114, And transmits the received supply power to the charge control unit 114. [ The charge controller 114 rectifies the supplied power so that the battery 116 is charged.

The first non-contact short-range wireless communication unit 112 controls the first switch 111 for communication for wireless charging control so that the first non-contact short-range wireless communication unit 112 and the first non- do. The first switch 111 performs a switching operation so that the first non-contact short-range wireless communication unit 112 is connected to the first terminal 119 under the control of the first non-contact local area wireless communication unit 112.

The first non-contact short-range wireless communication unit 112 is connected to the first non-contact short-range wireless communication antenna according to the connection of the first terminal 119 and the second terminal 129. The first non-contact short-distance wireless communication unit 112 performs non-contact short-range communication, for example, NFC communication with the charging pad 200 while being connected to the first non-contact short- The first non-contact wireless local area communication unit 112 transmits a message received from the charging pad 200 to the charging control unit 114 and transmits a message to be transmitted from the charging control unit 114 to the charging pad 200. [

Hereinafter, a wireless charging method according to an operation of the wireless charging apparatus according to an embodiment of the present invention will be described.

3 is a flowchart of a wireless charging method according to an embodiment of the present invention. Referring to FIG. 3, in step 302, the portable terminal 100 transmits identification information of the portable terminal 100 to the charging pad 200 for wireless charging, and requests authentication. At this time, when the portable terminal 100 is placed in the charging pad 200 for charging in the initial (idle) state in which the first non-contact short range wireless communication unit 112 and the first non-contact short range wireless communication antenna 122 are connected, Transmits the identification information of the portable terminal 100 to the charging pad 200 through the first non-contact short range wireless communication unit 112 and the first non-contact short range wireless communication antenna 122, and requests authentication. Accordingly, the charging pad 200 performs authentication using the identification information of the portable terminal 100 and transmits an authentication response message according to the authentication result to the portable terminal 100. Upon completion of the authentication, the wireless pad transmission unit 226 And the TX resonance unit 228, as shown in FIG.

The portable terminal 100 receives an authentication response message from the charging pad 200 through the first non-contact proximity proximity wireless communication antenna 122 and the first non-contact proximity wireless communication unit 112 in step 304. When the authentication response message is received The process proceeds to step 306.

The portable terminal 100 is connected to the first switch 111 and the second switch 112 so that the charging controller 114 disposed in the main body 110 and the wireless power receiver 126 disposed in the battery cover 120 are connected at step 306 Lt; RTI ID = 0.0 > 121). ≪ / RTI >

4 is a block diagram of a portable terminal 100 according to an embodiment of the present invention in which a charge control unit 114 disposed in a main body 110 and a wireless power receiving unit 126 disposed in a battery cover 120 are connected Fig.

4, the portable terminal 100 controls the first switch 111 to connect the charge control unit 114 and the first terminal 119 through the first non-contact short-range wireless communication unit 112, And controls the second switch 121 so that the wireless power receiving unit 126 and the second terminal 129 are connected through the receiving unit 126.

The first non-contact short range wireless communication unit 112 may send the control signal 1 to the first switch 111 so that the charge control unit 114 and the first terminal 119 are connected. The wireless power receiving unit 126 may be configured such that the wireless power receiving unit 126 and the second terminal 129 are connected to each other according to a change in current or voltage caused by resonance of the RX resonance unit 128 by the TX resonance unit 228 To the second switch (121).

When the charging control unit 114 and the wireless power receiving unit 126 are connected through the first terminal 119 and the second terminal 129 to enter the charging mode as described above, And receives power supplied from the charging pad 200 through the power receiving unit 126 to charge the battery 116.

In step 310, the portable terminal 100 determines whether charging is completed. If the charging of the battery 116 is completed, the portable terminal 100 transmits the first switch 111 and the second switch 112 so that the first non-contact short range wireless communication unit 112 and the first non- 2 switch 121, as shown in FIG.

5 is a block diagram of a portable terminal 100 according to an embodiment of the present invention. The portable terminal 100 includes a first non-contact short range wireless communication unit 112 disposed in the main body 110 and a second non- And the wireless communication antenna 122 is connected.

5, the portable terminal 100 controls the first switch 111 so that the first non-contact short-range wireless communication unit 112 and the first terminal 119 are connected through the first non-contact short-distance wireless communication unit 112, And controls the second switch 121 so that one non-contact short range wireless communication antenna 122 and the second terminal 129 are connected through the wireless power receiving unit 126.

The first non-contact local area wireless communication unit 112 may send the control signal 3 to the first switch 111 so that the first non-contact local area wireless communication unit 112 and the first terminal 119 are connected. The wireless power receiving unit 126 receives the control signal 4 for connecting one non-contact short range wireless communication antenna 122 and the second terminal 129 in accordance with the current or voltage change due to the completion of the charging of the battery 116, To the second switch (121).

When the first non-contact short range wireless communication unit 112 and the first non-contact short range wireless communication antenna 122 are connected and the non-contact short range wireless communication with the charging pad 200 becomes possible as described above, Contact wireless local area communication unit 112 and the first non-contact short range wireless communication antenna 122 to the charging pad 200. In this case,

According to the wireless charging apparatus and method of the present invention as described above, when a method of physically dividing some components for wireless charging and connecting them through a connection terminal is used, a small number, for example, So that the number of necessary connection terminals can be reduced and the circuit configuration can be simplified.

Further, according to the wireless charging apparatus and method according to the embodiment of the present invention, wireless power transmission control for wireless charging using noncontact local area communication is performed, so that it is not necessary to provide a separate communication module for wireless charging, .

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. For example, in the above description, the NFC communication method is used as the non-contact short-range wireless communication method according to the embodiment of the present invention. However, the present invention is not limited to the ZFC, ZigBee communication, Bluetooth communication, A short-range wireless communication scheme is also available. In addition, although the portable terminal and the charging pad have been described as an example in the embodiment of the present invention, any device can be applied as long as it performs wireless power transmission and performs charging by receiving wireless power. Accordingly, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by equivalents to the scope of the appended claims.

Claims (9)

In an electronic device,
switch;
Local area communication antenna;
A wireless power receiving antenna;
Wherein the electronic device is placed on a wireless power transmitter for wireless charging in an initial state or an idle state and is connected to the short range communication antenna by the switch, A short range communication unit configured to transmit authentication information for a process; And
Wherein when the connection between the local area communication antenna and the local area communication unit is released by the switch after the authentication process and is connected to the wireless power reception antenna, the wireless charging control unit configured to charge the battery of the electronic device using the received wireless power, ≪ / RTI >
The method according to claim 1,
Wherein the short-range communication unit transmits a charge completion signal to the wireless power transmitter through the short-range communication antenna when the charging is completed and the short-range communication antenna and the short-range communication unit are connected by the switch.
The method according to claim 1,
Wherein the short-range communication antenna and the wireless power-receiving antenna are disposed on the inner surface of the housing of the electronic device.
The method according to claim 1,
Wherein the wireless charging antenna is electrically connected to the wireless charging control unit through a plurality of connection terminals of the switch.
The method according to claim 1,
Wherein the short-range communication antenna is electrically connected to the short-range communication unit through a plurality of connection terminals of the switch.
A wireless charging method in an electronic device,
Controlling the switch such that when the electronic device is placed on a wireless power transmitter for wireless charging in an initial state or an idle state, a short range communication antenna and a short range communication section are connected;
Transmitting authentication information for an authentication process of the electronic device to the wireless power transmitter via the short-range communication antenna;
Controlling the switch so that the connection between the local area communication antenna and the local area communication unit is released and the radio power reception antenna is connected to the radio charge control unit after the authentication process;
Receiving wireless power from the wireless power transmitter via the wireless power receive antenna;
Performing charging of the battery of the electronic device using the received wireless power through the wireless charging controller;
Determining whether the charging is completed;
Controlling the switch to connect the short-range communication antenna and the short-range communication unit when the charging is completed; And
And transmitting a charge completion signal to the wireless power transmitter via the short-range communication antenna.
The method according to claim 6,
Wherein the short-range communication antenna and the wireless power receiving antenna are disposed on the inner surface of the housing of the electronic device.
The method according to claim 6,
Wherein the wireless charging antenna is electrically connected to the wireless charging control unit through a plurality of connection terminals of the switch.
The method according to claim 6,
Wherein the short-range communication antenna is electrically connected to the short-range communication unit through a plurality of connection terminals of the switch.

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