KR20190010314A - Pad type wireless charger for electric device - Google Patents

Abstract

The present invention relates to a pad type wireless charger wirelessly charging an electric device such as a laptop. More specifically, the present invention relates to the pad type wireless charger which can charge the electric device while using the electric device freely at a desired location on the transmission pad portion by selecting a power transmission coil unit lined with a power receiving coil of the electric device among a plurality of the power transmission coil units on the power transmission pad portion and rapidly and exactly search for the transmission coil unit to transmit power from a transmission coil unit adjacent to a transmission coil unit having a searching signal strength value more than a set value. The pad type wireless charger comprises: a power transmission portion in which a plurality of power transmission coil units are arranged; a searching signal providing portion providing the searching signal in a consecutive order to the plurality of power transmission coil units; a coil unit selection portion selecting a selection coil unit among the plurality of power transmission coil units; and a charging control portion charging the electric device by supplying an electric power through the selection coil unit.

Description

[0001] The present invention relates to a pad type wireless charger for an electronic device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pad-type wireless charging apparatus for wirelessly charging an electronic device such as a notebook computer, and more particularly, to a power- The electronic device can be charged while freely using the electronic device at a desired position in the transmission pad unit, and sequentially transmit the search signals from the plurality of transmission coil units, and, in response to the search signal, The present invention relates to a pad-type wireless charging apparatus capable of quickly and accurately searching a transmission coil unit for transmitting power from among transmission coil units adjacent to a transmission coil unit.

The recharging method of the electronic device battery can be divided into a wired charging method which is connected to the power source by wire, and a wireless charging method by which electromagnetic induction is not performed directly.

In the case of the wire charging system, a charging adapter is connected to a charging terminal formed on one side or lower side of the electronic apparatus, and a cord of the adapter is connected to a power outlet.

In order to solve the inconvenience of the wired charging method, a wireless charging method has been developed. In the wireless charging method according to the related art, when the electronic device in which the battery to be charged is placed is placed on the primary coil of the charger, the charging is performed by the secondary coil of the battery. That is, the secondary coil is charged with the electric power induced by the induced electromotive force by the magnetic field generated in the primary coil.

Korean Patent No. 10-1055280 (entitled " Wireless charging system using short range wireless communication and wireless charging case) " has been disclosed as an example of a wireless charging apparatus employing such a technique. This technology is composed of a base station (corresponding to the above-described charging pad) for transmitting a signal by using a near field communication system and a cellular phone case for converting and outputting the signal into a charging power source.

However, in the case of a conventional charging pad using a wireless charging method, in order to charge the electronic device with high efficiency, the transmission coil of the charging pad and the position of the receiving coil of the electronic device must be accurately aligned. It is difficult to precisely align the positions of the power receiving coils provided inside the electronic device. In order to align the positions of the power transmission coils and the power receiving coils while the user puts the electronic device at a desired position among the charging pads and uses them, It is difficult to charge the battery.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power supply apparatus and a power supply apparatus for a power supply apparatus, The present invention provides a pad type wireless recharging apparatus capable of performing the above-described operations.

It is another object of the present invention to provide a power transmission apparatus and a power transmission apparatus which can select a power transmission coil unit that is aligned with power receiving coils of an electronic device among a plurality of power transmission coil units provided in a power transmission pad unit, The present invention provides a pad-type wireless charging device capable of charging a pad-type wireless charging device.

It is another object of the present invention to provide a transmission coil unit which transmits a search signal sequentially from a plurality of transmission coil units provided in a transmission pad unit and which has a search signal strength value higher than a predetermined value in response to a search signal, Type wireless charging apparatus that can quickly and accurately search a transmission coil unit for transmitting power from among units.

It is a further object of the present invention to provide a transmission coil unit in which a plurality of transmission coil units and a plurality of pressure sensors are disposed together in a transmission pad unit so that a transmission coil unit, And to provide a padded wireless charging device capable of searching quickly.

   Another object of the present invention is to periodically receive a charging signal strength value from an electronic device while charging an electronic device through a selected transmission coil unit and to re-search the transmission coil unit when the charging signal strength value is less than a set value And it is an object of the present invention to provide a padded wireless charging device capable of wirelessly charging an electronic device with high efficiency.

In order to accomplish the object of the present invention, a pad type wireless charging apparatus according to the present invention includes a transmission pad unit in which a plurality of transmission coil units are arranged, and a search signal supplier for sequentially providing search signals to a plurality of transmission coil units. A coil unit selection unit for selecting a selection coil unit among the plurality of transmission coil units based on a search signal intensity value received from the charging electronic device in response to a search signal transmitted to the plurality of transmission coil units, And a charging control unit for supplying power to the charging electronic device through the charging control unit.

Here, the coil unit selection unit selects the transmission coil unit having the largest search signal intensity value as the selection coil unit based on the search signal strength value received from the charging electronic device in response to the search signal transmitted from the plurality of transmission coil units .

Preferably, the coil unit selection unit according to the present invention searches for a candidate transmission coil unit in which a search signal strength value received from a charging electronic device in response to a search signal transmitted from a plurality of transmission coil units is first detected above a first threshold value An adjacent coil determination unit for determining a predetermined number of adjacent transmission coil units positioned adjacent to the candidate transmission coil unit; and a determination unit for determining, based on the search signal among the candidate transmission coil unit and the adjacent transmission coil unit, And a selection unit which selects the transmission coil unit having the largest search signal strength value received from the transmission coil unit as the selection coil unit.

Preferably, the pad-type wireless charging apparatus according to the present invention further comprises a plurality of pressure sensors disposed between the plurality of power transmission coil units.

The coil unit selection unit according to the present invention is characterized in that a plurality of transmission coil units adjacent to a pressure sensor in which a pressure change is detected among a plurality of pressure sensors are successively controlled to transmit a search signal to select a selected coil unit.

Here, the plurality of power transmission coil units according to the present invention are formed by stacking at least two power transmission coil layers in which the power transmission coil units are arranged in a matrix, and the power transmission coil units of the power transmission coil layers are arranged so as to cross each other .

Here, the coil unit selection unit according to the present invention compares the charging signal intensity value periodically received from the charging electronic device with the second threshold value while the charging electronic device is being charged by the selection coil unit, The selection coil unit is rediscovered and determined.

The pad type wireless charging apparatus according to the present invention has the following various effects.

First, the pad type wireless charging apparatus according to the present invention can wirelessly charge electronic equipment with high efficiency by aligning the power transmission coil unit provided in the transmission pad unit and the power receiving coil of the electronic equipment.

Second, the pad-type wireless charging apparatus according to the present invention searches for and selects a transmission coil unit that is aligned with the reception coils of the electronic equipment among a plurality of transmission coil units provided in the transmission pad unit, You can use it freely in position and charge electronic devices.

Third, the pad-type wireless charging apparatus according to the present invention transmits a search signal sequentially from a plurality of transmission coil units provided in a transmission pad unit, and transmits a search signal to a power transmission coil unit It is possible to quickly and accurately select the transmission coil unit to be transmitted by a plurality of transmission coil units by searching the transmission coil unit for transmission of power among the adjacent transmission coil units.

Fourth, in the pad type wireless charging apparatus according to the present invention, a plurality of pressure sensors are disposed in the transmission pad unit together with a plurality of transmission coil units, and a power transmission coil unit It is possible to quickly and accurately select the transmission coil unit to be transmitted in the plurality of transmission coil units.

Fifth, the pad type wireless charging apparatus according to the present invention periodically receives the charging signal strength value from the electronic equipment while charging the electronic equipment through the selected transmission coil unit, and when the charging signal strength value is equal to or less than the set value, It is possible to wirelessly charge the electronic device with high efficiency by changing the transmission coil unit which is aligned with the receiving coils of the electronic equipment even if the electronic equipment is moved during charging of the electronic equipment.

1 is a view for explaining an example of using a pad type wireless charging apparatus according to the present invention.
2 is a view for explaining an example of a pad-type wireless charging apparatus according to the present invention.
3 is a view for explaining another example of the pad-type wireless charging apparatus according to the present invention.
4 shows an example of the internal construction of the transmission pad according to the present invention.
5 is a functional block diagram for explaining an example of a control panel according to the present invention.
6 is a view for explaining an example of a coil unit selecting unit according to the present invention.
7 is a diagram for explaining an example of a method of determining a selected transmission coil unit from a candidate transmission coil unit.
8 is a view for explaining an example of the arrangement of the power transmission coil units disposed on the power transmission pads according to the present invention.

It is noted that the technical terms used in the present invention are used only to describe specific embodiments and are not intended to limit the present invention. In addition, the technical terms used in the present invention should be construed in a sense generally understood by a person having ordinary skill in the art to which the present invention belongs, unless otherwise defined in the present invention, Should not be construed to mean, or be interpreted in an excessively reduced sense. In addition, when a technical term used in the present invention is an erroneous technical term that does not accurately express the concept of the present invention, it should be understood that technical terms can be understood by those skilled in the art.

Furthermore, the singular expressions used in the present invention include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as "comprising" or "comprising" and the like should not be construed as encompassing various elements or various steps of the invention, Or may further include additional components or steps.

It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

Hereinafter, a padded wireless charging apparatus according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a view for explaining an example of using a pad type wireless charging apparatus according to the present invention.

1, the pad-type wireless charging device 10 is located on a top surface of a table or a desk, and a user places electronic equipment such as a notebook computer 31 or a PDA 33 on a table or a desk, It is placed on the wireless charging device 10 and is used while using or charging electronic equipment.

The pad type wireless charging apparatus 10 determines the position where the electronic apparatuses 31 and 33 are placed and is disposed inside the pad type wireless charging apparatus 10 aligned with the position where the electronic apparatuses 31 and 33 are placed Power is supplied to the power transmission coil unit, and the electronic devices 31 and 33 are wirelessly charged through the power transmission coil unit and the power reception coils of the electromagnetic equipment.

Here, in addition to the notebook computer 31 and the PDA 33, the electronic device includes a power transmission coil unit and an electromagnetically-induced power reception coil. Various types of electronic equipment for charging the battery with power supplied from the power reception coil may be used.

2 is a view for explaining an example of a pad-type wireless charging apparatus according to the present invention.

2, the pad type wireless charging device includes a transmission pad 100 and a control panel 200. [

A plurality of transmission coil units 110 are arranged in the transmission pad 100. The plurality of transmission coil units 110 are arranged in a matrix with a predetermined spacing from each other.

On the other hand, the control panel 200 sequentially applies a search signal to the transmission coil unit 110 or receives a search signal strength value from an electronic device in response to a search signal to charge the electronic devices among the plurality of transmission coil units 110 And a module for periodically controlling the transmission coil unit when the position of the electronic equipment is changed or stopping the charging of the electronic equipment by receiving the charging signal intensity value periodically from the electronic equipment during charging of the electronic equipment Respectively.

The transmission pad 100 and the control panel 200 may be integrally formed according to the field to which the present invention is applied, but preferably the transmission pad 100 and the control panel 200 may be detachably coupled to each other. The transmission pad 100 is damaged or aged relatively quickly as compared with the control panel 200 by frequent contact with the electronic device or the user's skin. By detachably separating the transmission pad 100 and the control panel 200 from each other, The control panel 200 can be economically saved by replacing only the transmission pad 100 having a relatively short life span as compared with the control panel 200 or using either the transmission pad 100 or the control panel 200 If it fails, you can replace the failed part.

3 is a view for explaining another example of the pad-type wireless charging apparatus according to the present invention.

3, the pad type wireless charging apparatus includes a transmission pad 100 'and a control board 200. In the transmission pad 100', a plurality of transmission coil units 110 are provided. And a plurality of pressure sensors 150 are arranged. The plurality of power transmission coil units 110 are spaced apart from each other at regular intervals and are arranged in a matrix, and the plurality of pressure sensors 150 are spaced apart from each other and arranged in a matrix. Preferably, the plurality of pressure sensors 150 may be spaced apart from each other by a predetermined distance in the space between the power transmission coil units 110.

On the other hand, in the control panel 200, a position of the electronic device is determined through a pressure sensor in which a pressure change is detected among the plurality of pressure sensors 150, and a plurality of transmission coil units 110, Or by selecting a transmission coil unit used for charging an electronic device among a plurality of transmission coil units 110 by receiving search signal strength values from an electronic device in response to a search signal, Modules for periodically receiving a charging signal intensity value from an electronic device during charging and changing a transmission coil unit or stopping charging of the electronic device when the position of the electronic device is changed are disposed.

In the pad type wireless charging apparatus according to one or more embodiments of the present invention described in FIGS. 2 and 3, the transmission pad and the control panel may be fastened to each other with a connection terminal. FIG. As shown in FIG.

4, a plurality of transmission coil units 110 are arranged in the transmission pad, or a plurality of transmission coil units 110 and a plurality of pressure sensors 150 are arranged together.

A pressure sensor arranged in each row among the plurality of pressure sensor 150 arranged in a matrix or in the form of a power transmission coil unit arranged in a line in each row among the plurality of power transmission coil units 100 arranged in a matrix form is connected to the connection line 130 To the connection terminal 140 assigned to each row. For example, the pressure in the first row among the plurality of pressure sensors 150 arranged in a matrix form or the power transmission coil unit arranged in a line in the first row among the plurality of power transmission coil units 100 arranged in a matrix form The sensor is connected to the first connection terminal 140-1 through a connection line.

Here, the connection terminal formed on the transmission pad and the connection terminal formed on the control board may be formed of corresponding female / male connection terminals. For example, when the female connection terminal is formed on the transmission pad, And the connection terminals and the control panel can be fastened to each other through the female / male connection terminals.

A plurality of transmission coil units arranged in two or more rows may be connected to one connection terminal or a plurality of pressure sensors arranged in two or more rows may be connected to one connection terminal in accordance with the field to which the present invention is applied So that connection terminals corresponding to the control panel can be formed.

5 is a functional block diagram for explaining an example of a control panel according to the present invention.

5, the search signal providing unit 210 generates a search signal and sequentially provides the generated search signal to a plurality of transmission coil units disposed in the transmission pad. The search signal providing unit 210 generates search signals at predetermined time intervals and sequentially provides the generated search signals to the plurality of transmission coil units. The transmission / reception unit 230 provides the search signals to the plurality of transmission coil units And receives the search signal strength value from the electronic device every time. That is, when the electronic apparatus is placed on the transmission pad, the search signal strength values induced in the electronic apparatuses according to the degree of electromagnetic induction between the power transmission coil unit and the power reception coils of the electronic apparatus due to the search signals provided to the respective power transmission coil units, Lt; / RTI >

The coil unit selection unit 250 receives the search signal strength value from the electronic device via the transmission / reception unit 230 every time the search coil is provided with the plurality of transmission coil units. The transmission coil unit is selected as the selection coil unit to be charged with the electronic device.

The charge control unit 270 supplies power to the selection coil unit to charge the electronic device. Herein, the charging controller 270 periodically receives the charging signal intensity value from the electronic device through the charging / receiving unit 230 of the electronic device. When the charging signal intensity value is equal to or less than the preset threshold value, It is predicted that the device is not placed on the transmission pad, and control is performed so that a plurality of transmission coil units reselect the transmission coil unit to be charged with the electronic device. In the process of reselecting the transmission coil unit, the transmission coil unit is reselected through the search signal providing unit 210 and the coil unit selection unit 250 in the same manner as described above. When the search signal strength value exceeding the set threshold value is received It is determined that the electronic device is not placed on the transmission pad and the charging operation of the electronic device is stopped.

Meanwhile, the charge control unit 270 periodically transmits a charge amount request message to the electronic device through the charging / receiving unit 230 and receives information on the charge amount from the electronic device in response to the charge amount request message. The charging operation of the electronic device is stopped. The charge control unit 270 restarts the charge operation of the electronic device again when the charge amount of the electronic device received from the electronic device is less than the critical charge amount.

Preferably, the control panel according to the present invention further includes a pressure sensing unit 290 having a plurality of pressure sensors. The pressure sensing unit 290 senses the pressure change and determines the position of the electronic device on the transmission pad do. The coil unit selection unit 250 selects the sensing transmission coil unit located in the pressure sensor in which the pressure change is detected among the entire transmission coil units and provides a search signal to the sensing transmission coil unit through the search signal providing unit 210 Select the transmission coil unit to be charged with the electronic device. Thus, it is possible to quickly and accurately determine the position where the electronic device is placed through the pressure sensing unit 290 and to quickly and accurately determine whether the transmission coil unit to be charged or the electronic device is placed on the transmission pad through the pressure change.

6 is a view for explaining an example of a coil unit selecting unit according to the present invention.

The candidate coil searching unit 251 compares the search signal strength value and the first threshold value sequentially when receiving search signal strength values from the charging electronic device in response to the search signals sequentially transmitted from the plurality of transmission coil units And searches for a candidate transmission coil unit to be detected for the first time above the first threshold value among the search signal intensity values.

The adjacent coil determination unit 253 determines a predetermined number of adjacent transmission coil units positioned adjacent to the candidate transmission coil unit. The selection unit 255 selects one of the adjacent transmission coil units in response to the search signal among the candidate transmission coil unit and the adjacent transmission coil unit. The transmission coil unit having the largest search signal strength value received from the device is selected as the selection coil unit.

There is a transmission coil unit that is aligned with the power reception coil in the periphery of the candidate transmission coil unit where the search signal intensity value is first detected to be equal to or higher than the first threshold value, so that a certain number of transmissions It is possible to select the transmission coil unit to be charged with the electronic device quickly and precisely.

7 is a diagram for explaining an example of a method of determining a selected transmission coil unit from a candidate transmission coil unit.

7, when a search signal strength value equal to or greater than the first threshold value is received for the first time in the first transmission coil unit in the process of sequentially providing search signals to a plurality of transmission coil units, It is determined that the power reception coil 35 of the first power transmission coil unit is located adjacent to the first power transmission coil unit.

The first transmission coil unit is determined as the candidate transmission coil unit, and the number of transmission coil units, for example, three transmission coil units positioned in the right direction from the predetermined number of transmission coil units, for example, from the candidate transmission coil unit, The eight transmission coil units (the second transmission coil unit to the ninth transmission coil unit) constituted by the three transmission coil units are determined as the adjacent transmission coil unit.

The fifth transmission coil unit having the highest search signal intensity value among the candidate transmission coil unit and the adjacent transmission coil unit is selected to charge the electronic equipment.

8 is a view for explaining an example of the arrangement of the power transmission coil units disposed on the power transmission pads according to the present invention.

Referring to FIG. 8, more specifically, a plurality of power transmission coil units provided in the transmission pad are formed of a plurality of layers.

That is, a plurality of power transmission coil units are formed on a virtual coplanar plane and spaced apart at regular intervals to form one power transmission coil layer, and a plurality of power transmission coil layers are stacked on a virtual plane spaced apart from each other, Thereby forming a power transmission coil unit.

Preferably, the power transmission coil units constituting each power transmission coil layer are disposed so as to intersect with the power transmission coil unit of the power transmission coil layer located above or below each other. For example, three power transmission coil layers of a first power transmission coil layer 111, a second power transmission coil layer 113 and a third power transmission coil layer 115 are formed on a power transmission pad. The first power transmission coil layer 111 Is disposed so as to intersect with the power transmission coil unit of the second power transmission coil layer 113 disposed on the first power transmission coil layer 111 and the power transmission coil unit constituting the second power transmission coil layer 113 The power transmission coil unit is disposed so as to intersect with the power transmission coil unit of the third power transmission coil layer 115 disposed on the second power transmission coil layer 113.

As described above, the power transmission coil units are arranged with the plurality of power transmission coil layers spaced apart from each other, and the power transmission coil unit constituting each power transmission coil layer is disposed so as to intersect with the power transmission coil unit of the adjacent power transmission coil layer, The electronic apparatus can be efficiently charged with the power transmission coil unit accurately aligned with the coil.

The above-described embodiments of the present invention can be embodied in a general-purpose digital computer that can be embodied as a program that can be executed by a computer and operates the program using a computer-readable recording medium.

The computer-readable recording medium may be a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.), an optical reading medium (e.g. CD ROM, Lt; / RTI > transmission).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Pad-type wireless charging device 30: Electronic device
100, 100 ': transmission pad 200: control panel
110: power transmission coil unit 140: connection terminal
150: Pressure sensor
210: Search signal supply unit 230: Transmitting /
250: coil unit selection unit 270: charge control unit
290:

Claims (7)

A power transmission pad portion in which a plurality of power transmission coil units are arranged;
A search signal supplier for sequentially providing a search signal to the plurality of power transmission coil units;
A coil unit selector for selecting a selected coil unit among the plurality of power transmission coil units based on a search signal strength value received from the charging electronic device in response to the search signal transmitted to the plurality of power transmission coil units; And
And a charging controller for supplying power to the charging electronic device through the selection coil unit. The apparatus of claim 1, wherein the coil unit selector
And selects the transmission coil unit having the largest search signal intensity value as the selection coil unit based on the search signal strength value received from the charging electronic device in response to the search signal transmitted from the plurality of transmission coil units Gt; < / RTI > 3. The apparatus of claim 2, wherein the coil unit selector
A candidate coil search unit for searching a candidate transmission coil unit in which a search signal strength value received from the charging electronic device is first detected at a first threshold value or more in response to the search signal transmitted from the plurality of transmission coil units;
An adjacent coil determining unit determining a predetermined number of adjacent transmission coil units located adjacent to the candidate transmission coil unit; And
And a selecting unit for selecting a transmission coil unit having the largest search signal strength value received from the charging electronic device in response to a search signal among the candidate transmission coil unit and the adjacent transmission coil unit as a selection coil unit Type wireless charging device. 4. The pad-type wireless charging device according to any one of claims 1 to 3,
And a plurality of pressure sensors disposed between the plurality of power transmission coil units. 5. The apparatus of claim 4, wherein the coil unit selector
Wherein a plurality of transmission coil units adjacent to a pressure sensor in which a pressure change is detected among a plurality of pressure sensors sequentially transmit a search signal to select a selection coil unit. 4. The power transmission unit according to any one of claims 1 to 3, wherein the plurality of power transmission coil units
At least two transmission coil layers in which transmission coil units are arranged in a matrix form,
Wherein the power transmission coil units of the power transmission coil layers which are different from each other are arranged so as to cross each other. 4. The apparatus according to any one of claims 1 to 3, wherein the coil unit selection unit
When the charging electronic device is being charged by the selection coil unit, the charging signal intensity value periodically received from the charging electronic device is compared with a second threshold value, and when the charging signal intensity value is equal to or less than the second threshold value, And determines to re-search the pad-type wireless charging device.

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