KR100734676B1 - Apparatus for wireless charging having multi-charge cell and Method for controlling the same - Google Patents

Abstract

The present invention discloses a wireless charging device having a plurality of charging cells and a control method thereof. The wireless charging device according to the present invention includes a plurality of weight sensing means for outputting a weight sensing signal by a pressure applied by a battery when the battery is mounted, and a primary coil for generating a magnetic field by application of a high frequency alternating current. A charging station including a charging cell; And wireless charging means for transmitting a wireless charging power to a battery by applying a high frequency alternating current to the primary coil of the charging cell which outputs the weight sensing signal. According to the present invention, it is possible to minimize the leakage of the magnetic field to maximize the charging efficiency.

Description

Apparatus for wireless charging having multi-charge cell and Method for controlling the same}

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 is a schematic block diagram of a conventional wireless charging device.

2 is a perspective view showing a state of charging a battery using a conventional wireless charging device.

3 is a top plan view of a wireless charging station in accordance with a preferred embodiment of the present invention.

4 is a cross-sectional view taken along line AA ′ of FIG. 3.

FIG. 5 is a top plan view illustrating a state in which a battery is mounted in the charging station of FIG. 3.

6 is a device configuration diagram of a wireless charging device and a battery charged by the device according to a preferred embodiment of the present invention.

The present invention relates to a charging device for charging a battery wirelessly, and more particularly to a charging device having a plurality of charging cells and a control method thereof.

Personal portable devices such as mobile phones, PDAs, notebooks, etc., are powered by rechargeable batteries. When the user of the personal portable device falls below a predetermined level, the user of the portable device charges the battery using a charger and then uses the battery again.

A battery of a general personal portable device has an externally exposed connection terminal to be electrically connected to a charging terminal provided in a charger. When the battery is charged, the charging terminal of the charger and the connection terminal of the battery are connected to each other to maintain an electrically connected state.

However, since the charging terminal and the connection terminal are exposed to the outside for mutual connection, they are easily contaminated by foreign substances, and wear occurs due to friction between both terminals in the process of connecting the charging terminal and the connection terminal, and moisture in the air. This causes a problem that the connection between the charging terminal and the connection terminal becomes poor due to corrosion of the charging terminal and the connection terminal. If moisture penetrates into the battery through the minute gap of the connection terminal during the use of the battery, a fatal problem of completely discharging the battery is caused by a short circuit of the internal circuit.

In order to solve this problem, a wireless charging technology has recently been proposed in which a battery of a personal portable device can be charged while being coupled with a charger in a contactless manner by an electromagnetic induction phenomenon. Wireless charging technology is now widely used in everyday products such as electric toothbrushes and electric shavers.

1 schematically shows the configuration of a wireless charging device and a battery according to the prior art.

Referring to FIG. 1, the wireless charging device 10 receives power from a commercial AC power source 20 and outputs a high frequency AC current, and a high frequency AC from the high frequency power driving means 30. It is provided with a primary coil 40 for receiving a current to form a magnetic field (M).

In addition, the battery 50 may include a battery cell 60 in which electrical energy is charged, a secondary side coil 70 in which a high frequency alternating current is induced according to a linkage of the magnetic field M generated in the primary side coil 40, and a secondary side. A rectifier 80 converts the high frequency AC current induced by the coil 70 into a DC current, and a constant voltage / constant current supply 90 that applies the DC current rectified by the rectifier 80 to the battery cell 60.

Here, the constant voltage / constant current supply unit 90 is a known circuit element widely used in a battery charging device. The constant voltage / constant current supply unit 90 supplies a constant current to the battery cell 60 at the beginning of charging, but gradually decreases the supply of current when the charging voltage of the battery cell 60 gradually increases and exceeds a specific reference value. It performs a function of keeping the voltage constant until the cell 60 becomes full.

On the other hand, the conventional wireless charging device having the above-described configuration has a problem that the charging efficiency varies depending on the position of the battery to be charged. This is because the intensity of the magnetic field generated in the primary coil 40 varies with position. For example, when the primary coil 40 is circular, the strength of the magnetic field is relatively low in the center of the primary coil.

2 is a perspective view illustrating a state where a battery is placed on a conventional wireless charging device 10 and charged.

Referring to FIG. 2, the conventional wireless charging device 10 includes a charging station 100 on which a charging target battery 50 is seated. Inside the charging station 100, as shown by the dotted line, the primary coil 40 is built around the periphery.

The primary coil 40 has a winding form repeatedly wound N times and is driven by the application of an alternating current to generate a magnetic field externally. However, the inner surface area of the primary coil 40 is larger than the battery 50. Therefore, a considerable amount of the magnetic field generated in the primary coil 40 leaks without being bridged with the secondary coil provided on the battery side.

Therefore, the conventional wireless charging device 10 has the advantage of being able to charge in a wireless manner, but has the disadvantage of consuming a lot of energy compared to the wired charging method.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a wireless charging device and a control method thereof capable of maximizing charging efficiency by minimizing leakage of a magnetic field.

The wireless charging device for achieving the above technical problem, has a weight sensing means for outputting a weight sensing signal by the pressure applied by the battery when mounting the battery and a primary coil for generating a magnetic field by the application of a high frequency alternating current A charging station including a plurality of charging cells; And wireless charging means for applying a high frequency alternating current to the primary coil of the charging cell that outputs the weight sensing signal to transfer wireless charging power to the battery.

Preferably, the wireless charging means, the multiple switching unit for switching the turn on and off for the primary coil of the charging cell; A high frequency power driver for applying a high frequency AC current to the multiple switching unit; And identifying the charging cell outputting the weight sensing signal, controlling the multiple switching unit to turn on the primary side coil of the identified charging cell, and controlling the high frequency power driver to turn on the primary side coil turned on through the multiple switching unit. It includes; a microprocessor for applying a high frequency alternating current to.

Preferably, the wireless charging means, the sensor signal receiving unit for outputting the identification data of each of the charging cells for receiving the weight detection signal and output the weight detection signal to the microprocessor.

According to an aspect of the invention, the wireless charging means, the antenna for receiving a response signal from the battery; And a wireless receiver configured to demodulate a response signal received from the antenna and output the demodulated signal to a microprocessor, wherein the microprocessor applies a high frequency AC current for checking battery response to the primary coil for each of the identified charging cells. After that, when a battery response signal is output from the wireless receiver, the corresponding charging cell is designated as an operation target charging cell, and wireless charging is performed by applying a high frequency AC current for wireless charging only to the designated charging cell.

According to another aspect of the invention, the wireless charging means, the antenna for receiving a response signal from the battery; And a wireless receiver configured to demodulate a response signal received from the antenna and output the demodulated signal to a microprocessor, wherein the microprocessor applies a high frequency AC current for checking battery response to the primary coil to the identified charging cell. After checking whether the battery response signal is output from the wireless receiver, if the battery response signal is output, the object mounted in the charging station is regarded as a battery and wireless charging is performed by applying a high frequency AC current to the identified charging cell.

According to another aspect of the invention, the wireless charging means, the antenna for receiving a response signal from the battery; And a wireless receiver configured to demodulate a response signal and a DC current strength value received from the antenna and output the demodulated signal to a microprocessor, wherein the microprocessor is configured to check a battery response in a primary coil for each of the identified charging cells. When the battery response signal and the DC current intensity value are output from the wireless receiver after applying the current, the corresponding charging cell is designated as the operation charging cell only when the DC current intensity value exceeds a predetermined level, and the wireless charging is performed only for the designated charging cell. Wireless charging is performed by applying high frequency AC current.

Preferably, the weight sensing means is a piezoelectric sensor.

Alternatively, the weight sensing means may comprise: a top plate having a predetermined surface area; A spring member supporting the upper plate and elastically biased according to the downward movement of the upper plate; And a switch which is turned on according to the downward movement of the upper plate and outputs a weight sensing signal.

Wireless charging control method according to an aspect of the present invention for achieving the above technical problem, the magnetic field by the application of a high-frequency alternating current and weight sensing means for outputting a weight sensing signal by the pressure applied by the battery when the battery is mounted A wireless charging control method using a charging station including a plurality of charging cells having a primary coil for generating a, comprising: (a) receiving a weight sensing signal from a weight sensing means of at least one or more charging cells; (b) identifying a charging cell that has received the weight sensing signal; And (c) wirelessly transmitting charging power by applying a high frequency alternating current to the primary coil of the identified charging cell.

Alternatively, in the step (c), for each of the identified charging cells, a high frequency current for battery response checking may be applied to the primary coil, waiting for the battery to be responded, and a response if the battery response signal is received through the antenna. Designating a charging cell receiving the signal as an operation target charging cell; And wirelessly transmitting charging power by applying a high frequency alternating current to the primary coil of the charging cell designated as the operation target charging cell.

Alternatively, in step (c), for each of the identified charging cells, a high frequency current for battery response checking may be applied to the primary coil, and whether the response signal is received from the battery through the antenna may be determined. Terminating the process of checking whether a response signal has been received for the remaining charging cells when the reception is first confirmed; And wirelessly transmitting charging power by applying a high frequency alternating current to the primary coil of the identified charging cell.

Alternatively, in step (c), for each of the identified charging cells, a high frequency current for acknowledging battery response may be applied to a primary coil, and a response signal and a DC current strength value are received from a battery through an antenna, and Designating a corresponding charging cell as an operation target charging cell only when the DC current intensity value is equal to or greater than a predetermined level; And wirelessly transmitting charging power by applying a high frequency alternating current to the primary coil of the designated charging cell.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

3 is a plan view of a charging station included in the wireless charging apparatus according to the preferred embodiment of the present invention, Figure 4 is a cross-sectional view of the charging station along the line AA 'of FIG.

3 and 4, the charging station 200 included in the wireless charging device includes a plurality of charging cells # 1 to # 15 that individually generate magnetic fields. Each of the charging cells # 1 to # 15 is formed of a winding 210 in which coils are repeatedly wound by a predetermined number, and are embedded at a point spaced a predetermined distance from an upper surface of the charging station 200. The shape of the charging cells # 1 to # 15 is not limited to the rectangle as shown in the drawing. Therefore, it may be configured in various shapes such as a circle, a polygon.

The weight sensing unit 220 is provided on the top of each of the charging cells # 1 to # 15. Preferably, the weight sensing means 220 is a piezoelectric sensor that outputs an electrical signal by recognizing the pressure of the object mounted on the charging station 200.

When the battery is mounted in the charging station 200, the weight sensing signal is output from the weight sensing means 200 to which pressure is applied by the contact of the battery. In addition, the present invention selectively operates only a charging cell outputting a weight sensing signal to wirelessly charge a battery. Here, operating the charging cell means applying a high frequency alternating current to the charging cell. When a high frequency AC current is applied to the charging cell, a magnetic field is generated in the primary coil constituting the charging cell.

For example, as shown in FIG. 5, when the electric station E equipped with a battery, for example, a mobile phone, is mounted in the charging station 200, the charging cells # 7, # 8, # 9, # that are in contact with the mobile phone are mounted. Operate only 12, # 13, # 14 to charge the battery in the phone.

6 is a block diagram illustrating a circuit configuration of a wireless charging device and a battery according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the wireless charging device C according to the present invention includes a weight sensing unit 220, a primary coil 230, and a high frequency power driver 240 provided in each of the charging cells # 1 to # n. , A multiple switching unit 250, a sensor signal receiving unit 260, an antenna 270, a wireless receiving unit 280, a microprocessor 290, and a power supply unit 300.

The weight sensing means 200 outputs a weight sensing signal to the sensor signal receiving unit 260 when the charging target battery B is mounted on the charging station and makes a contact. Preferably, the weight sensing means 200 is a piezoelectric sensor.

The sensor signal receiving unit 260 receives the weight sensing signal output from the weight sensing unit 220, and according to whether or not the weight sensing signal is received (1 is operation, 0 is Non-operation) into the microprocessor 290.

The microprocessor 290 receives a data value related to the operation of each sensor from the sensor signal receiver 260 and then identifies the charging cell that outputs the weight detection signal. Then, the multi-switching unit 250 is controlled to turn on the charging cell having the fastest order among the identified charging cells. Then, the high frequency power driver 240 is controlled to apply a high frequency alternating current (battery response checking current) to the multiple switching unit 250 for a predetermined time and wait for the reception of the response signal from the battery B. The high frequency AC current is applied to determine whether the object sensed by the weight sensing unit 220 is a battery. When a current for checking battery response is applied, a magnetic field is generated in the primary coil 230 for a predetermined time. If the object mounted on the charging station fits the battery, the battery transmits a response signal corresponding to the magnetic field to the charging device.

In detail, the battery B includes a secondary coil 310, a rectifier 320, a constant voltage / constant current supply unit 330, a microprocessor 340, a wireless transmitter 350, an antenna 360, and a battery cell 370. ).

The secondary coil 310 generates a high frequency induction current corresponding to the magnetic field generated by the battery response confirmation current. Here, the intensity of the high frequency induction current is proportional to the degree of linkage of the magnetic field. The high frequency induction current generated by the secondary coil 310 is applied to the rectifier 320 side.

The rectifier 320 smoothes the high frequency induction current induced by the secondary coil 310 to convert it into a DC current, and then applies a part of the rectifier 320 to the microprocessor 340. Then, the microprocessor 340 is driven and initialized. When the initialization is completed, the microprocessor 340 outputs a pre-defined response signal to the wireless transmitter 350. Then, the wireless transmitter 350 modulates the response signal and transmits the modulated response signal to the wireless charging device C through the antenna 360. Preferably, the frequency band for the modulation of the response signal is 10 ~ 15MHz.

The response signal is received by the antenna 270 of the wireless charging device C and input to the wireless receiver 280. Then, the wireless receiver 280 demodulates the response signal and inputs it to the microprocessor 290. In response, the microprocessor 290 designates an identification code of the charging cell to which the battery response checking current is applied as the operation target charging cell and stores the identification code in the memory.

On the other hand, if the response signal is not received despite waiting for a predetermined time, the microprocessor 290 determines that the object mounted on the charging stage is not the battery and does not proceed any further process. Preferably, the wireless charging device (C) may be provided with a warning light, the microprocessor 290 may notify the user by turning on the warning light when it is determined that the object mounted on the charging stage is heterogeneous. .

The above-described application of the battery response checking current, the reception of the response signal from the battery B, and the designation of the corresponding charging cell as the operation target charging cell are repeated for all the charging cells that output the weight detection signal. In the example shown in FIG. 5, the process is repeated for all of the charging cells corresponding to # 7, # 8, # 9, # 12, # 13, and 14 #.

Alternatively, if at least one charging cell receiving the response signal from the battery B is identified among the charging cells outputting the weight sensing signal, no further response signal receiving process may be performed. The presence of a charging cell that has received a response signal means that the object mounted in the charging station is a battery.

When the designated process of the operation target charging cell is completed for all the charging cells that output the weight sensing signal, the microprocessor 290 controls the multiple switching unit 250 to turn on all the charging cells designated as the operation target charging cells. In the example shown in FIG. 5, the charging cells corresponding to # 7, # 8, # 9, # 12, # 13, and 14 # are turned on. In this state, the microprocessor 290 controls the high frequency power driver 240 to apply a high frequency AC current for transmitting charge power to the battery to the multiple switching unit 250. Preferably, the frequency band of the high frequency alternating current is several tens of KHz, for example 80 KHz. Then, the high frequency AC current is applied only to the primary coil 230 of the charging cell turned on by the multiple switching unit 250, and the high frequency AC current is not applied to the primary coil 230 of the remaining charging cells. That is, the high frequency AC current is applied only to the charging cell in contact with the battery B.

As described above, when a high frequency alternating current is applied only to the charging cells contacted by the battery B, a magnetic field is generated in each of the charging cells. And, the magnetic field generated in this way is chained to the secondary coil 310 of the battery (B). Accordingly, the secondary coil 310 generates a high frequency induction current proportional to the strength of the bridged magnetic field and is applied to the rectifier 320. Then, the rectifier 320 rectifies and smoothes the AC current to convert the DC current, and applies the converted current to the constant voltage / constant current supply unit 330, while a part of the converted current is a power source of the microprocessor 340. To supply.

When the current converted into direct current is applied to the constant voltage / constant current supply unit 330, the charging of the battery cell 370 is gradually performed, and the voltage of both ends of the battery cell 300 increases until it is fully charged.

The microprocessor 340 controls the constant voltage / constant current supply unit 330 to charge the battery cell 370 in the constant current mode until the charging voltage of the battery cell increases to a certain level, and then the voltage of the battery cell 370 is at a predetermined level. If more than this, the battery cell 370 is charged in the constant voltage mode.

Meanwhile, the front end voltage V _pp and the rear end voltage V _ch of the constant voltage / constant current supply unit 330 are measured and periodically input to the microprocessor 340 by a voltage detector not shown. Then, the microprocessor 340 determines whether the battery cell 370 is full due to the voltage difference between the both ends of the constant voltage / constant current supply unit 330. If it is determined that the battery cell 370 is full, the microprocessor 340 outputs a charge end request signal to the wireless transmitter 350. Then, the wireless transmitter 350 modulates the charge termination request signal and transmits the modulated charge termination request signal to the wireless charging device C through the antenna 360. Here, the carrier frequency band for the modulation of the charge termination request signal is 10 ~ 15MHz.

The charge end request signal is received through the antenna 270 of the wireless charging device (C) is input to the wireless receiver 280. Then, the wireless receiver 280 demodulates the charge end request signal and is input to the microprocessor 290. In response, the microprocessor 240 stops the transmission of the charging power via the magnetic field by stopping the operation of the high frequency power driver 240. Then, the magnetic field is no longer generated in the charging cell in contact with the battery B.

On the other hand, in the above-described embodiment, the charging was performed using all of the charging cells output the weight detection signal by the weight sensing means 220. That is, referring to FIG. 5, charging is performed using all # 7, # 8, # 9, # 12, # 13, and # 14 cells.

However, from the viewpoint of charging efficiency, it is preferable to select a charging cell having a relatively large contact area with the battery B and proceed with charging. To this end, in an alternative embodiment of the present invention, the process of selecting a charge cell having a large contact area with the battery (B) of the charging cell sensed the weight of the battery (B) is further proceeded.

That is, as described above, when the magnetic field corresponding to the current for checking the battery response is connected to the secondary coil 310 of the battery B, a high frequency induction current is generated and applied to the rectifier 320. In this case, the intensity of the smoothed DC current is measured at the output terminal of the rectifier 320 by using the current measuring unit, which is not shown, and the value is input to the microprocessor 340. Then, the microprocessor 340 outputs the strength value of the DC current to the wireless transmitter 350 together with the response signal. Then, the wireless transmitter 350 modulates the strength of the response signal and the DC current, and transmits the modulated signal to the wireless charging device C through the antenna 360. Here, the carrier frequency band for modulating the intensity value of the response signal and the direct current is 10 ~ 15MHz.

The response value of the wirelessly transmitted signal and the intensity value of the DC current are received by the wireless receiver 280 through the antenna 270. Then, the wireless receiver 280 demodulates the response signal and the intensity value of the direct current, and is input to the microprocessor 290. Then, the microprocessor 290 stores the identification code of the charging cell in which the response signal is received and the strength value of the DC current induced by the cell in the memory.

The process of storing the identification code of the charging cell in which the above-described response signal is received and the strength value of the DC current induced by the cell in the memory are repeated for all the charging cells that output the weight sensing signal.

The microprocessor 290 obtains the induced DC current value for all the charged cells in which the weight is sensed, and then selects only the charge cells whose induced DC current value is greater than or equal to a predetermined level. Then, only the selected charging cells are designated as operation target charging cells to apply high frequency alternating current for charging. That is, only the charging cells whose induced DC current value is higher than or equal to a predetermined level are turned on and the high frequency power driving unit 240 is driven to apply a high frequency AC current for transferring charging power to the primary coils 230 of the respective charging cells. do.

When the charging process proceeds as described above, charging may be performed using a charging cell capable of generating a larger induced current, thereby further increasing charging efficiency.

In the above-described embodiment, the weight sensing means 220 may be replaced by a mechanical mechanism. That is, each charging cell is configured to include an upper plate, an elastic biasing member (for example, a spring) and a switch provided at the lower portion of the upper plate, and the charging cell is configured to open and close the switch by the vertical movement of the upper plate.

In this case, when the battery is mounted in the charging station, the top of the charging cell in contact with the battery is pressed down by the weight of the battery, the charging cell is in an elastic bias state. As a result, the switch is operated so that the weight sensing signal is output to the sensor signal receiver. Then, when the battery is removed from the charging station, the elastic bias state of the charging cell is released while the top plate of the charging cell is restored to its original position.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

According to an aspect of the present invention, since the charging station is composed of a plurality of charging cells and wireless charging is performed using only the charging cells in contact with the battery, the charging efficiency may be improved by minimizing leakage of the magnetic field.

In addition, according to the configuration of the present invention it is possible to charge a plurality of electronic devices.

According to another aspect of the present invention, by charging the charging cells having a high charging efficiency among the charging cells in contact with the battery to proceed with the wireless charging can maximize the charging efficiency.

According to another aspect of the present invention, since wireless charging does not start by sensing the weight, it is not necessary to consider the standby mode when designing the wireless charging device, thereby preventing power consumption according to the standby mode.

Claims (12)

A charging station including a plurality of charging cells having a weight sensing means for outputting a weight sensing signal by a pressure applied by the battery when the battery is mounted, and a primary coil for generating a magnetic field by application of a high frequency alternating current; And And wireless charging means for applying a high frequency alternating current to the primary coil of the charging cell that outputs the weight sensing signal to transfer wireless charging power to the battery. The method of claim 1, wherein the wireless charging means, A multiple switching unit for switching on and off of the primary coil of the charging cell; A high frequency power driver for applying a high frequency AC current to the multiple switching unit; And Identifying a charging cell that outputs the weight detection signal, controlling the multiple switching unit to turn on the primary coil of the identified charging cell, and control the high frequency power driver to the primary coil turned on via the multiple switching unit Wireless charging device comprising a; microprocessor for applying a high frequency alternating current. The method of claim 2, wherein the wireless charging means, And a sensor signal receiving unit configured to receive the weight sensing signal and output identification data of each charging cell that outputs the weight sensing signal to the microprocessor. The method of claim 2, wherein the wireless charging means, An antenna for receiving a response signal from the battery; And And a radio receiver for demodulating the response signal received from the antenna and outputting the demodulated signal to the microprocessor. The microprocessor applies a high frequency alternating current for battery response confirmation to the primary coil for each of the identified charging cells, and when the battery response signal is output from the wireless receiver, designates the corresponding charging cell as an operation target charging cell, and designates the designated charging cell. A wireless charging device characterized by performing a wireless charging by applying a high frequency alternating current for wireless charging only to the cell. The method of claim 2, wherein the wireless charging means, An antenna for receiving a response signal from the battery; And And a radio receiver for demodulating the response signal received from the antenna and outputting the demodulated signal to the microprocessor. The microprocessor applies a high frequency alternating current for battery response confirmation to the primary coil for the identified charging cell and then checks whether the battery response signal is output from the wireless receiver. A wireless charging device, characterized in that the object is a battery and a high frequency alternating current is applied to the identified charging cell to perform wireless charging. The method of claim 2, wherein the wireless charging means, An antenna for receiving a response signal from the battery; And And a radio receiver for demodulating the response signal and the DC current strength value received from the antenna and outputting the demodulated signal to the microprocessor. The microprocessor applies a current to the primary coil to the battery response check current for each of the identified charging cells, and when the battery response signal and the DC current intensity value are output from the wireless receiver, the DC current intensity value exceeds a predetermined level. Only in this case, the charging cell is designated as an operation target charging cell, and the wireless charging device performs wireless charging by applying a high frequency alternating current for wireless charging only to the designated charging cell. The method according to any one of claims 1 to 6, The weight sensing means is a wireless charging device, characterized in that the piezoelectric sensor. The method according to any one of claims 1 to 6, The weight sensing means includes: a top plate having a predetermined surface area; A spring member supporting the upper plate and elastically biased according to the downward movement of the upper plate; And a switch which is turned on according to the movement of the upper plate downward and outputs a weight sensing signal. Using a charging station comprising a plurality of charging cells having a weight sensing means for outputting a weight sensing signal by the pressure applied by the battery when the battery is mounted, and a primary coil for generating a magnetic field by the application of a high frequency alternating current In the wireless charging control method, (a) receiving a weight sensing signal from a weight sensing means of at least one charging cell; (b) identifying a charging cell that has received the weight sensing signal; And (c) wirelessly transmitting charging power by applying a high frequency alternating current to the primary coil of the identified charging cell. Using a charging station comprising a plurality of charging cells having a weight sensing means for outputting a weight sensing signal by the pressure applied by the battery when the battery is mounted, and a primary coil for generating a magnetic field by the application of a high frequency alternating current In the wireless charging control method, (a) receiving a weight sensing signal from a weight sensing means of at least one charging cell; (b) identifying a charging cell that has received the weight sensing signal; (c) For each of the identified charging cells, applying a high frequency current for acknowledging the battery response to the primary coil and waiting for the battery response, when the response signal of the battery is received through the antenna, operates the charging cell receiving the response signal. Designating as a target charging cell; And and (d) wirelessly transmitting charging power by applying a high frequency alternating current to the primary coil of the charging cell designated as the operation target charging cell. Using a charging station comprising a plurality of charging cells having a weight sensing means for outputting a weight sensing signal by the pressure applied by the battery when the battery is mounted, and a primary coil for generating a magnetic field by the application of a high frequency alternating current In the wireless charging control method, (a) receiving a weight sensing signal from a weight sensing means of at least one charging cell; (b) identifying a charging cell that has received the weight sensing signal; (c) For each of the identified charging cells, a high frequency current for battery response checking is applied to the primary coil, and whether the response signal is received from the battery through the antenna is checked. Terminating a process of checking whether a response signal is received for the cell; And (d) wirelessly transmitting charging power by applying a high frequency alternating current to the primary coil of the identified charging cell. Using a charging station comprising a plurality of charging cells having a weight sensing means for outputting a weight sensing signal by the pressure applied by the battery when the battery is mounted, and a primary coil for generating a magnetic field by the application of a high frequency alternating current In the wireless charging control method, (a) receiving a weight sensing signal from a weight sensing means of at least one charging cell; (b) identifying a charging cell that has received the weight sensing signal; (c) For each of the identified charging cells, a high frequency current for battery response checking is applied to the primary coil, and a response signal and a DC current strength value are received from the battery through an antenna, and the DC current strength value is equal to or greater than a predetermined level. In this case, designating the corresponding charging cell as the operation target charging cell; And and (d) wirelessly transmitting charging power by applying a high frequency alternating current to the primary coil of the designated charging cell.

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