KR101305142B1 - Table with wireless charging device using battery power - Google Patents

Table with wireless charging device using battery power Download PDF

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Publication number
KR101305142B1
KR101305142B1 KR1020130020936A KR20130020936A KR101305142B1 KR 101305142 B1 KR101305142 B1 KR 101305142B1 KR 1020130020936 A KR1020130020936 A KR 1020130020936A KR 20130020936 A KR20130020936 A KR 20130020936A KR 101305142 B1 KR101305142 B1 KR 101305142B1
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KR
South Korea
Prior art keywords
battery
unit
charging power
power generation
signal
Prior art date
Application number
KR1020130020936A
Other languages
Korean (ko)
Inventor
김익언
최영석
정두원
이승희
Original Assignee
주식회사 엘트로닉스
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Filing date
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Application filed by 주식회사 엘트로닉스 filed Critical 주식회사 엘트로닉스
Priority to KR1020130020936A priority Critical patent/KR101305142B1/en
Application granted granted Critical
Publication of KR101305142B1 publication Critical patent/KR101305142B1/en

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B13/00—Details of tables or desks
    • A47B13/08—Table tops; Rims therefor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2200/00—General construction of tables or desks
    • A47B2200/008—Tables or desks having means for applying electronic or electric devices

Abstract

PURPOSE: A table with a wireless charging device is provided to be used regardless of a place and to prevent a space from being messy. CONSTITUTION: A table with a wireless charging device comprises an upper plate (141) and a support unit (144) for supporting the upper plate. An antenna unit is arranged on the upper surface of the upper plate. A charging power generating unit is provided with DC power from a battery detachable from the upper plate, generates high frequency alternating currents, and electrically connects to the antenna unit through a connector. The support unit supports the upper plate from the bottom of the upper plate. The charging power generating unit comprises a battery voltage detection unit and an auxiliary power source unit.

Description

Table with battery-powered wireless charging unit {TABLE WITH WIRELESS CHARGING DEVICE USING BATTERY POWER}

An embodiment of the present invention relates to a table, and more particularly, to a table provided with a wireless charging device using battery power.

Recently, a variety of portable devices, such as a mobile phone, a portable multimedia player (PMP), an MP3 player, a digital camera, a laptop, and the like, which satisfy a user's demand for mobility and portability, have been used. In general, mobile devices have a built-in battery and recharge the battery when the battery is discharged. Here, a technology for wirelessly charging a battery has been developed to maximize the convenience of battery charging.

1 is a view schematically showing a conventional wireless charging system.

Referring to FIG. 1, a conventional wireless charging system includes a transmitter 12 and a receiver 14. The transmitter 12 is connected by wire to the outlet 10 installed in the building. At this time, the transmitter 12 receives the commercial power (AC power such as 220V or 110V) through the outlet (10). The transmitter 12 converts the supplied commercial power (AC power such as 220V or 110V) into a predetermined DC voltage, generates high frequency AC power using the converted DC voltage, and radiates high frequency AC power into the air. . The receiver 14 receives the high frequency AC power radiated by the transmitter 12 into the air by electromagnetic induction. The receiving device 14 rectifies the received high frequency AC power to charge the battery of the receiving device 14.

According to the conventional wireless charging system, since the transmitter 12 receives power from commercial power (AC power such as 220V or 110V), it is inconvenient to be electrically connected to the commercial power through the connection line and the outlet 10. have. In this case, when a wireless charging service for a mobile device is to be provided at an agency that sells a mobile phone or tablet PC, a break room in a company, and a coffee shop, an outlet 10 may be connected to each transmitter 12 mounted on a table through a connection line. ) Must be connected. At this time, the outlet 10 is installed in a specific place, and since the length of the connection line is limited, place restrictions are placed on arranging the table. In addition, as each transmitter 12 is connected to the outlet 10 through a connection line, there is a problem in that the appearance of a plurality of connection lines to harm the appearance. In this case, a user or an administrator may need to arrange the connection lines separately.

An embodiment of the present invention is to provide a table that can provide a wireless charging service without being connected to a commercial power source.

Table according to an embodiment of the present invention, the antenna is disposed on the upper surface, the lower surface or the upper plate is provided with a charging power generator for generating a high frequency AC power on the upper surface; And at least one support part supporting the top plate at the bottom of the top plate, wherein the charging power generation unit receives DC power from a battery that is detachably coupled and is electrically connected to the antenna unit through a connection unit.

Table according to another embodiment of the present invention, the top plate is disposed on the antenna unit; And at least one support part supporting the upper plate from a lower portion of the upper plate, the charging power generating unit generating high frequency AC power, wherein the charging power generating unit is supplied with DC power from a battery that is detachably coupled to the charging plate. It is electrically connected to the antenna through the connecting portion.

According to the embodiment of the present invention, the wireless charging device mounted on the table is supplied with power through the battery, so that it is not necessary to be connected to the commercial power source (AC power such as 220V or 110V) by wire. As a result, when using the wireless charging device mounted on a table, it is possible to solve the space limitation due to the connection line and the outlet, to prevent the messy space caused by the multiple connection lines, and the trouble of the user to arrange the connection line. Can be eliminated.

1 is a view showing a conventional wireless charging system.
2 is a diagram showing a table provided with a wireless charging device using battery power according to an embodiment of the present invention.
3 is a view showing a wireless charging device mounted to a table according to an embodiment of the present invention.
4 is a block diagram showing a configuration of a charging power generation unit in a table according to an embodiment of the present invention.
5 is a view showing an antenna unit in a table according to an embodiment of the present invention.

Hereinafter, a specific embodiment of a table provided with a wireless charging device using a battery power source of the present invention will be described with reference to FIGS. 2 to 5. However, this is an exemplary embodiment only and the present invention is not limited thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The technical idea of the present invention is determined by the claims, and the following embodiments are merely a means for efficiently describing the technical idea of the present invention to a person having ordinary skill in the art to which the present invention belongs.

2 is a diagram illustrating a table provided with a wireless charging device using battery power according to an embodiment of the present invention.

Referring to FIGS. 2A and 2B, the table 140 includes a top plate 141 and at least one support 144 supporting the top plate 141. An antenna unit 106 may be disposed on an upper surface of the upper plate 141, and a charging power generation unit 104 including a battery may be mounted on a lower surface of the upper plate 141. At this time, the antenna unit 106 disposed on the upper surface of the upper plate 141 and the charging power generating unit 104 installed on the lower surface of the upper plate 141 are electrically connected through the connection unit 110. Here, the charging power generating unit 104 is shown as being installed on the lower surface of the upper plate 141, but is not limited thereto, the charging power generating unit 104 is to be installed on the upper surface or the support portion 144 of the upper plate 141. It may be. When the charging power generating unit 104 is installed on the upper surface of the upper plate 141, the antenna unit 106 may be disposed on the upper portion of the charging power generating unit 104, but is not limited thereto. 104 and the antenna unit 106 may be disposed spaced apart from each other on the upper surface of the top plate (141). In addition, although four support parts 144 are formed below the upper plate 141, the number of the support parts 144 is not limited thereto.

The charging power generation unit 104, the antenna unit 106, and the connection unit 110 coupled with the battery form a wireless charging device. Here, the wireless charging device may be installed for each table 140. That is, when a plurality of tables 140 are arranged in a predetermined room, a wireless charging device may be installed in each table 140. The charging power generating unit 104 receives power from the battery to generate high frequency AC power. The antenna unit 106 radiates high frequency AC power generated by the charging power generation unit 104 into the air. Here, when the mobile device is placed on the upper portion of the antenna unit 106 disposed on the upper plate 141 of the table 140, the mobile device receives the high frequency AC power to charge the battery of the mobile device.

In this case, the wireless charging device mounted on the table 140 receives power from the battery, so that the wireless charging device does not need to be connected to a commercial power source (AC power such as 220V or 110V) in a wired manner. Therefore, when providing a wireless charging service in mobile phones and tablet PC stores, coffee shops, libraries and the like, it is possible to freely arrange the table 140 equipped with a wireless charging device without limiting the location. In addition, the space can be prevented from being messy due to a plurality of connection lines, to avoid the need for the user to arrange the connection line, it is possible to easily charge the device. Hereinafter, a detailed description of the wireless charging device mounted on the table 140 will be described later with reference to FIGS. 3 to 5.

3 is a view showing a wireless charging device mounted on a table according to an embodiment of the present invention. Referring to FIG. 3, the wireless charging device 100 includes a battery 102, a charging power generating unit 104, and an antenna unit 106.

The battery 102 supplies DC power to the charging power generation unit 104. The battery 102 has a constant thickness and may be formed in a rectangular shape. However, the present invention is not limited thereto and may be formed in various shapes other than the above. The battery 102 is detachably coupled with the charging power generator 104. For example, the battery 102 is coupled to the charging power generation unit 104 while being drawn into the charging power generation unit 104, and is drawn out of the charging power generation unit 104 while being charged to the charging power generation unit 104. ) Can be separated. When the battery 102 is combined with the charging power generator 104, the battery 102 is also electrically connected to the charging power generator 104.

The charging power generator 104 receives a DC power from the battery 102 to generate a high frequency AC current. In this case, the charging power generator 104 does not need to be electrically connected to a commercial power source (AC power such as 220V or 110V) by using a DC power source of the battery 102. The charging power generator 104 may include a space corresponding to the shape of the battery 102 so that the battery 102 may be retracted. Here, the battery 102 may be drawn out of the charging power generation unit 104 or drawn into the charging power generation unit 104 through a pressing method. For example, when the battery 102 is drawn into the internal space of the charging power generator 104, an elastic member (not shown) installed inside the charging power generator 104 is contracted by the battery 102. It can be stored in combination with the locking device (not shown) in a state. And, when the user withdraws the battery 102, pressing the button 108 mounted on one surface of the charging power generating unit 104 releases the locking device (not shown), the original elastic member (not shown) In this case, the battery 102 may be extended to the outside of the battery 102.

However, the manner in which the battery 102 is drawn in or drawn out is not limited thereto, and various other methods may be applied. For example, the battery 102 may be drawn in or drawn out in a slide manner. In this case, the battery 102 is slide coupled with the charging power generation unit 104. Here, a detailed configuration regarding the battery 102 being drawn in or drawn out through the pressing method or the sliding method is not shown since it is a known technology.

The detailed configuration of the charging power generating unit 104 will be described with reference to FIG. 4. 4 is a block diagram showing a configuration of a charging power generation unit in a table according to an embodiment of the present invention. Referring to FIG. 4, the charging power generating unit 104 may include a switch unit 120, a battery voltage detector 122, a notification unit 124, a communication unit 126, an auxiliary power supply unit 128, and a control unit 129. Include.

The switch unit 120 generates a high frequency AC current (for example, several tens of KHz) by switching the DC voltage supplied from the battery 102 at high speed according to the pulse control signal generated by the controller 129. In this case, the high frequency AC current is applied to the antenna unit 106 through the connection unit 110.

The battery voltage detector 122 detects a voltage state of the battery 102 under the control of the controller 129. In this case, the battery voltage detector 122 may periodically detect the voltage state of the battery 102. The battery voltage detector 122 generates a battery replacement signal to the controller 129 when the voltage level of the battery 102 is equal to or less than a predetermined reference value. That is, in the embodiment of the present invention, since the charging power generator 104 is supplied with power from the battery 102, the battery 102 by frequently checking whether the voltage state of the battery 102 falls below a reference value. Needs to be replaced. The battery voltage detector 122 generates a battery detachment signal to the controller 129 when the voltage level of the battery 102 becomes zero immediately. When the voltage level of the battery 102 becomes zero instantaneously, the battery 102 is separated from the charging power generation unit 104. For example, when someone maliciously violently removes the battery 102 coupled to the charging power generator 104, the voltage level of the battery 102 may be instantaneously zero. In this case, the battery voltage detector 122 generates a battery detachment signal to the controller 129. In this case, it is possible to quickly cope with the theft accident of the battery 102.

When the battery replacement signal or the battery detachment signal is generated from the battery voltage detection unit 122, the notification unit 124 may control the voltage state of the battery 102 under the control of the controller 129 (eg, when the battery needs to be replaced). Status or battery removed). In this case, the alarm unit 124 may generate a warning sound or flash an indicator to inform the user or administrator of the fact that the battery 102 needs to be replaced or the battery 102 has been removed. Here, when generating a warning sound, the notification unit 124 may include a speaker. However, the method of notifying the voltage state of the battery 102 by the notification unit 124 is not limited thereto, and various other methods may be applied.

When the battery replacement signal or the battery detachment signal is generated from the battery voltage detector 122, the communication unit 126 transmits the battery replacement signal or the battery detachment signal to the battery state collection device 160 under the control of the controller 129. . The battery state collecting device 160 is installed in a room where at least one table 140 is disposed. The battery state collecting device 160 collects information about the state of the battery 102 of the wireless charging device 100 installed in each table 140. For example, the battery state collecting device 160 may be installed at a counter installed indoors or at a table of an administrator. The communication unit 126 may transmit a battery replacement signal or a battery detachment signal to the battery state collecting device 160 using short range wireless communication (eg, WLAN, Bluetooth, Zigbee, UWB, etc.). In this case, the communication unit 126 may transmit the battery replacement signal or the battery detachment signal including identification information for identifying the corresponding wireless charging device 100. In this case, the administrator may know whether the battery 102 of which wireless charging device 100 needs to be replaced or whether the battery 102 of which wireless charging device 100 has been removed from the charging power generator 104. Therefore, it is possible to respond quickly to such a situation.

The auxiliary power supply 128 serves to supply power to the charging power generator 104 when the battery detachment signal is generated from the battery voltage detector 122. When the battery 102 is separated from the charging power generation unit 104, since the power to the charging power generation unit 104 is stopped, the power supply to the charging power generation unit 104 is temporarily supplied through the auxiliary power supply 128. To supply. The auxiliary power supply 128 may be, for example, a small battery. However, the present invention is not limited thereto, and a capacitor may be used as the auxiliary power supply 128.

The controller 129 controls the operation of the overall charging power generator 104. Specifically, the controller 129 generates a pulse control signal to the switch unit 120 and controls the switch unit 120 to generate a high frequency AC current (for example, several tens of KHz). In this case, the controller 129 may generate a pulse control signal according to a charging start signal input from a user or an administrator. In addition, the controller 129 controls the battery voltage detector 122 to detect a voltage state of the battery 102. When the battery replacement signal or the battery detachment signal is generated by the battery voltage detector 122, the controller 129 controls the notification unit 124 to replace the battery 102 or that the battery 102 has been detached. You can tell the user or administrator the facts.

In addition, when the battery replacement signal or the battery detachment signal is generated by the battery voltage detector 122, the controller 129 collects a battery replacement signal or a battery detachment signal including the identification information of the corresponding wireless charging device 100. The communication unit 126 may be controlled to transmit to the 160. Herein, when the battery replacement signal or the battery detachment signal is generated by the battery voltage detector 122, the controller 129 may notify the voltage state of the battery 102 through the notification unit 124 according to a user's setting. The battery replacement signal or the battery detachment signal may be transmitted to the battery state collecting device 160 through the communication unit 126. In addition, while notifying the voltage state of the battery 102 through the notification unit 124, the battery replacement signal or the battery detachment signal may be transmitted to the battery state collecting device 160 through the communication unit 126. The controller 129 controls the auxiliary power supply 128 to supply power to the charging power generator 104 when the battery detachment signal is generated by the battery voltage detector 122.

Referring back to FIG. 3, the antenna unit 106 radiates high frequency AC current generated by the charging power generator 104 into the space. At this time, the induced electromotive force is generated by the electromagnetic induction phenomenon and the battery of the mobile device adjacent to the antenna unit 106 is charged wirelessly. The portable device may be, for example, a smartphone, a mobile phone, a tablet PC, a portable multimedia player (PMP), an MP3, a camera, a vibrating toothbrush, or the like. However, the present invention is not limited thereto, and various other mobile devices may be applied. The antenna unit 106 is electrically connected to the charging power generation unit 104 through the connection unit 110. The detailed configuration of the antenna unit 106 will be described with reference to FIG. 5.

5 is a view showing an antenna unit in a table according to an embodiment of the present invention. The antenna unit 106 includes a base layer 130, a radiator 132, and an anti-slip layer 134. The antenna unit 106 may be, for example, formed in a pad shape to facilitate placement on the table 140. However, the shape of the antenna unit 106 is not limited thereto.

The base layer 130 may be formed of, for example, an insulator in the form of a plate. The base layer 130 is in contact with the top plate of the table 140 or the charging power generator 104.

The radiator 132 is formed on the base layer 130. One end of the radiator 132 is electrically connected to the connection unit 110. The radiator 132 receives a high frequency alternating current from the charging power generating unit 104 to radiate into the space. The radiator 132 may be formed in various forms such as a spiral form, a meander form, and a loop form.

The anti-slip layer 134 is formed to surround the radiator 132 on the base layer 130. The anti-slip layer 134 serves to prevent the mobile device from slipping when the mobile device to be charged is placed on the antenna unit 106. That is, since the portable device is charged in a state where the floor is flat, such as the table 140, the anti-slip layer 134 having a predetermined level of frictional force is formed in the antenna unit 106 so that the portable device does not slip. The anti-slip layer 134 may be formed to have an uneven surface in order to increase friction with the portable device to be charged. The anti-slip layer 134 may be made of a rubber material, but is not limited thereto. In addition, the anti-slip layer 134 serves to protect the radiator 132 from the outside.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: wireless charging device 102: battery
104: charging power generation unit 106: antenna unit
108: button 110: connection
120: switch unit 122: battery voltage detection unit
124: notification unit 126: communication unit
128: auxiliary power supply unit 129: control unit
130: base layer 132: radiator
134: anti-slip layer 140: table
141: top plate 144: support portion
160: battery state collection device

Claims (7)

An upper plate having an antenna unit disposed on an upper surface thereof, receiving a DC power from a battery detachably coupled to the lower surface or the upper surface to generate high frequency AC power, and a charging power generation unit electrically connected to the antenna unit through a connecting unit; And
At least one support for supporting the top plate in the lower portion of the top plate,
The charging power generation unit,
A battery voltage detector configured to detect a voltage state of the battery and generate at least one of a battery replacement signal and a battery detachment signal according to the detected voltage state of the battery; And
And a sub power unit for supplying power to the charging power generation unit when the battery detachment signal is generated.
An upper plate on which an antenna unit is disposed; And
At least one support part which supports the top plate from the bottom of the top plate, receives a DC power from a battery which is detachably coupled to generate high frequency AC power, and a charging power generation unit electrically connected to the antenna unit through a connection unit. Including;
The charging power generation unit,
A battery voltage detector configured to detect a voltage state of the battery and generate at least one of a battery replacement signal and a battery detachment signal according to the detected voltage state of the battery; And
And a sub power unit for supplying power to the charging power generation unit when the battery detachment signal is generated.
delete 3. The method according to claim 1 or 2,
The charging power generation unit,
When the battery replacement signal or the battery removal signal is generated, the table further comprises a notification unit for notifying the voltage state of the battery through at least one of a beep and an indicator.
3. The method according to claim 1 or 2,
The charging power generation unit,
When the battery replacement signal or the battery detachment signal is generated, the battery replacement signal or the battery removal signal further comprises a communication unit for transmitting to the battery state collection device including the identification information of the table.
delete 3. The method according to claim 1 or 2,
The antenna unit,
Base layer;
A radiator formed on the base layer; And
And a non-slip layer formed surrounding the radiator on an upper portion of the base layer.
KR1020130020936A 2013-02-27 2013-02-27 Table with wireless charging device using battery power KR101305142B1 (en)

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
KR101413354B1 (en) 2014-04-30 2014-07-01 김고은 The mini table with multi-charging function
KR20150047949A (en) * 2013-10-25 2015-05-06 주식회사 한림포스텍 Wireless power transmission device for flat furniture and flat furniture having the same
CN105708141A (en) * 2016-04-25 2016-06-29 邓中专 Multi-functional desk
KR20170003850A (en) * 2015-06-30 2017-01-10 주식회사 이랜텍 Wireless electric power transmission device of clip type comprising battery
KR20170111491A (en) * 2016-03-28 2017-10-12 엘지전자 주식회사 Table
KR200485324Y1 (en) * 2016-06-29 2017-12-26 강동연 Cradle and smart phone equipped with aap for free charging and advertising
KR20200136857A (en) * 2013-10-25 2020-12-08 지이 하이브리드 테크놀로지스, 엘엘씨 Wireless power transmission device for flat furniture and flat furniture having the same
KR20220025780A (en) * 2020-11-23 2022-03-03 지이 하이브리드 테크놀로지스, 엘엘씨 Wireless power transmission device for flat furniture and flat furniture having the same

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Cited By (15)

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Publication number Priority date Publication date Assignee Title
KR102184179B1 (en) * 2013-10-25 2020-11-30 지이 하이브리드 테크놀로지스, 엘엘씨 Wireless power transmission device for flat furniture and flat furniture having the same
KR20150047949A (en) * 2013-10-25 2015-05-06 주식회사 한림포스텍 Wireless power transmission device for flat furniture and flat furniture having the same
KR102365975B1 (en) * 2013-10-25 2022-02-22 지이 하이브리드 테크놀로지스, 엘엘씨 Wireless power transmission device for flat furniture and flat furniture having the same
KR20200136857A (en) * 2013-10-25 2020-12-08 지이 하이브리드 테크놀로지스, 엘엘씨 Wireless power transmission device for flat furniture and flat furniture having the same
KR101413354B1 (en) 2014-04-30 2014-07-01 김고은 The mini table with multi-charging function
KR20170003850A (en) * 2015-06-30 2017-01-10 주식회사 이랜텍 Wireless electric power transmission device of clip type comprising battery
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KR20170111491A (en) * 2016-03-28 2017-10-12 엘지전자 주식회사 Table
KR102506518B1 (en) * 2016-03-28 2023-03-03 엘지전자 주식회사 Table
CN105708141A (en) * 2016-04-25 2016-06-29 邓中专 Multi-functional desk
KR200485324Y1 (en) * 2016-06-29 2017-12-26 강동연 Cradle and smart phone equipped with aap for free charging and advertising
KR20220025780A (en) * 2020-11-23 2022-03-03 지이 하이브리드 테크놀로지스, 엘엘씨 Wireless power transmission device for flat furniture and flat furniture having the same
KR102441208B1 (en) 2020-11-23 2022-09-06 지이 하이브리드 테크놀로지스, 엘엘씨 Wireless power transmission device for flat furniture and flat furniture having the same
KR20220126681A (en) * 2020-11-23 2022-09-16 지이 하이브리드 테크놀로지스, 엘엘씨 Wireless power transmission device for flat furniture and flat furniture having the same
KR102581627B1 (en) 2020-11-23 2023-09-21 지이 하이브리드 테크놀로지스, 엘엘씨 Wireless power transmission device for flat furniture and flat furniture having the same

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