KR20130076067A - Mobile capable of operating wireless charge and near field communication - Google Patents

Abstract

PURPOSE: A mobile communication terminal performing near filed communication and contactless charging is provided to minimize an increase in the size of the mobile communication terminal. CONSTITUTION: A first shielding object (40) for contact charging touches a side of a first coil (20) to be laminated on a battery (7). The first shielding object is formed through a possessed space of the first coil. The first shielding object has magnetic permeability blocking the distortion of the electromagnetic induction of the first coil. A second shielding object (50) for near field communication touches a side of a second coil (30) to be laminated on the battery. The second shielding object is formed on the same surface as the first shielding object's through a possessed space of the second coil. The second shielding object has magnetic permeability blocking the distortion of the electromagnetic induction of the second coil.

Description

Mobile terminal capable of contactless charging and short-range wireless communication {Mobile Capable of Operating Wireless Charge and Near Field Communication}

The present invention relates to a mobile communication terminal, and more particularly to a mobile communication terminal capable of contactless charging and short-range wireless communication.

In order to operate a mobile communication terminal represented by a mobile phone, a power supply is required, and a battery must be installed for this purpose. As a battery of a mobile phone, a multi-use rechargeable battery is widely used.

Wired (contact) charging has traditionally been widely used for charging batteries for mobile communication terminals, but recently contactless (wireless) charging has been introduced and used, and its application is gradually being expanded.

As a conventional technology related to contactless charging of a mobile communication terminal including a mobile phone, Korean Patent Publication No. 10-1995-0005819 (published on May 31, 1995) discloses a 'contactless charging system for a wireless telephone' and a Korean Patent Publication. 'Mobile phone wireless charging system' of No. 10-2002-0063050 (published Aug. 01, 2002), 'Mobile for wireless charging' of Korean Patent Publication No. 10-2004-0019164 (published Mar. 05. 2004) Battery and charger of communication terminal ',' wireless charging system and method for mobile communication terminal and its mobile communication terminal 'of Republic of Korea Patent Publication No. 10-2004-0107110 (published Dec. 20, 2004), Republic of Korea 'Mobile communication terminal and wireless charging device' of 10-2007-0033166 (published on March 26, 2007), and radio frequency of RDF reader of Korean Patent No. 10-0867405 (registered on October 31, 2008) Battery charging device for mobile communication terminal using 'Korean Registered Utility Model No. 20-021 'Wireless charging device' of 7303 (registered on Jan. 08, 2001), 'Mobile phone battery using wireless high-frequency power as charging power' of Korea Utility Model Registration No. 20-0400534 (registered on Oct. 31, 2005) Etc.

The most common principle of contactless charging is electromagnetic induction. When the secondary coil (cell phone) on the battery side to be charged is placed on the primary coil installed in the transmitter (charger, charging pad) supplied with AC power, the primary coil An induced electromotive force is generated between the secondary coil and the secondary coil, thereby charging the battery with the induced electromotive force.

6 is a schematic diagram of a contactless charging system by general electromagnetic induction.

As shown, the contactless charging system 100 is composed of a transmitter 110 (oscillator, charging pad) and the receiver 120 (charger). The transmitter 110 includes a transmission circuit 112 that operates by receiving AC power 111 and a primary coil 113 for electromagnetic induction, and the receiver 120 includes a primary coil 113 of the transmitter 110. And a secondary coil 121 and a charging circuit 122 to induce electromagnetic induction, and connect the battery 130 to the charging circuit 122 and the secondary coil 121 to the primary coil 113. ), The battery is charged by electromagnetic induction.

Contactless charging of mobile phones, a representative mobile communication terminal, is being standardized through the Wireless Power Consortium (WPC), which uses frequencies in the range of 110 kHz to 210 kHz for power transmission by electromagnetic induction. It is standardized to charge within the transmission distance. In addition, WPC is divided into several types according to the implementation method of the charging pad, and one of them (type A1) uses a magnet in the center of the primary coil of the charging pad to fix the secondary coil to the primary coil. It is prescribed.

As an example of applying a contactless charging system to a mobile phone, a 'charger cover' equipped with a receiver having a secondary coil and a charging circuit is manufactured separately from the mobile phone, and the battery of the mobile phone is connected to a connector or a cable. In the state of being electrically connected to the 'charge cover', a product has been developed to charge the battery by placing the 'charge cover' on the charging pad which is a transmitter.

However, when using a separate charging cover, it is inconvenient to have a separate charging cover for contactless charging of the mobile phone, so that the battery cover (a plastic synthetic resin that opens and closes the rear of the mobile phone to replace the battery) The receiver (secondary coil and charging circuit, in which case the charging circuit may be installed in the main body of the cellular phone) is embedded in, for example, attached or in-mold injection into the rear cover of the injection molding, thereby eliminating the need for a separate charging cover. A structure has been developed that allows for the implementation of contactless charging on its own.

7 is a schematic cross-sectional view of a conventional contactless charging system applied to a mobile phone.

As shown, the conventional contactless charging system 200 is largely composed of a charging pad 210 as a transmitter and a battery cover 220 of a mobile phone as a receiver.

The charging pad 210 (transmitter) is a case 211 made of a plastic synthetic resin, etc., built in the configuration of the transmitter, the circuit board 212 is laid on the bottom of the case 211 and the ferrite 213 thereon After raising, the primary coil 214 is attached on the ferrite 213, and then the permanent magnet 215 in the center of the primary coil 214 (eg, magnetic field strength of 1,000 gauss, thickness 2.6 mm, diameter 15.5 mm). Disc-shaped permanent magnets) are attached and covered with a case 211.

The battery cover 220 (receiver) is manufactured by embedding the ferrite 222 and the secondary coil 223 in the plastic injection molding 221, the ferrite 222 is buried between the battery 230 on the top, The secondary coil 223 is attached to the bottom of the ferrite 222 downward.

In general, the secondary coil 223 was manufactured by winding a plurality of coated copper wires having a diameter of about 0.3 mm, and the ferrite 222 was not less than 0.6 mm thick.

In the case of contactless charging by electromagnetic induction, the maximum charging efficiency is achieved when the primary coil center point and the secondary coil center point coincide with each other up and down, and as the center point of the secondary coil moves away from the primary coil center point in the horizontal direction When the power transmission is gradually reduced and heat is generated, and the distance is greater than a certain distance (for example, ㅁ 10mm), the electromagnetic field formed in the primary coil is not transmitted to the secondary coil, and thus charging is not performed.

In the WPC standard, the charging frequency is automatically changed in the range of 110 kHz to 210 kHz to compensate for the charging efficiency within a certain range of the charging range when the secondary coil moves horizontally away from the center point of the primary coil. Even if the charging efficiency is improved by changing the charging frequency, the efficiency is inevitably lowered by more than 20% of the maximum efficiency at the outermost position of the coil.

In FIG. 7, the permanent magnet 215 applied to the charging pad 210 has a ferrite 222 applied to the magnetic force of the permanent magnet 215 when the mobile phone (ie, the battery cover 220) is placed on the charging pad 210. Is attached so that the secondary coil is fixed in place on the primary coil. Permanent magnets are also attached to the center of the secondary coil 223 so that the two coils are fixed in position by the attraction force between the permanent magnets of both.

In FIG. 7, the ferrite 222 applied to the battery cover 220 is distorted in the electromagnetic field of the primary coil 214 by applying the permanent magnet 215 to the charging pad 210 to fix the secondary coil in position. And, to prevent the metal component, such as aluminum or iron contained in the battery 230 to interfere with the electromagnetic induction in the secondary coil, in general, the battery cover to use a ferrite 222 of 0.6mm or more thick electromagnetic The interference of the induction could be blocked to the desired degree, which adversely affects the miniaturization and light weight of the mobile phone.

As a result, in the conventional contactless charging system shown in FIG. 7, the second coil made of coated copper wire having a thickness of about 0.3 mm as an inevitable measure according to applying a permanent magnet 215 for fixing the two coils in place. 223 and the ferrite 222 having a thickness of 0.6 mm or more were inevitably applied, and thus, the second coil 223 and the ferrite 222 added up to the adhesive film, and the total thickness reached 1 mm. Since the thickness of the entire battery cover 220 plus up to 221 is increased to about 3 mm, the size of the battery cover 220 does not correspond to the miniaturization and light weight of the mobile phone.

In accordance with the above technical background, the present inventor proposed a "contactless charging system of a mobile phone" of the Republic of Korea Patent Application No. 10-2011-0109248 (2011.10.25 application). This system is an invention to meet the weight reduction and miniaturization of the mobile phone by minimizing the thickness of the secondary coil and ferrite applied to the battery cover.

In addition to the contactless charging environment, the wireless communication environment of RFID (Radio Frequency Identification (RFID)) is widely applied to a mobile communication terminal. For example, NFC, which realizes near field communication (NFC) in a mobile phone, is realized. When a chip (circuit) is installed and it is approached to an external RF reader, the NFC chip of the mobile phone is read by the RF reader and recorded the necessary information by near field communication, for example, such as an electronic money function. Function is realized.

At this time, the information exchange between the NFC chip and the RF reader, for driving the NFC chip by the induced electromotive force at 13.56MHz between the primary coil installed in the RF reader and the coil (secondary coil) of the NFC chip installed in the mobile phone. By supplying power.

In addition, the NFC chip installed in the mobile phone has been developed to operate as an RFID reader to read information recorded in an external RFID tag. When the NFC chip operates as an RF reader, a coil connected to the NFC chip acts as a primary coil to transmit power, and induction electromotive force is generated from a secondary coil installed in an external RFID tag so that wireless communication can be realized. do.

That is, in order to apply the RFID system (NFC) to the mobile communication terminal, a coil capable of generating induced electromotive force is required, and such a coil for NFC may be installed in the main body of the mobile communication terminal, but is also installed in the battery cover.

As a result, two coils for generating induced electromotive force are required to mount both a contactless charging function and a near field wireless communication function in a mobile communication terminal represented by a mobile phone.

8 is a schematic diagram of coil connection between contactless charging and short-range wireless communication applied to a mobile telephone.

As shown, the battery cover 300 is provided with a contactless charging coil 310 (WPC) and the NFC chip coil 320, both ends of the two coils in the mobile phone base charging circuit 330 is installed And to connect to the NFC chip 340, there are a total of four terminals, respectively, two coil terminals (WC +, WC-) for WPC-based contactless charging and two coil terminals (NFC +, NFC-) for NFC. Reference numeral 301 denotes a contactless charger.

SUMMARY OF THE INVENTION An object of the present invention relates to a mobile communication terminal equipped with a contactless charging (e.g., WPC) and near field communication (e.g., NFC), a coil for contactless charging, a coil for short-range wireless communication, and electromagnetic induction of these coils. In applying a shield (eg, ferrite sheet) to minimize the distortion in the mobile communication terminal, it is intended to minimize the increase in the size (thickness) of the mobile communication terminal due to their application, and to improve the shielding effect of the shield.

According to the present invention, a mobile communication terminal capable of contactless charging and short-range wireless communication is provided.

The mobile communication terminal of the present invention includes a battery cover, a first coil, a second coil, a first shield, and a second shield.

The battery cover is opened and closed to replace the battery of the mobile communication terminal, and is molded into a shape corresponding to the mobile communication terminal.

The first coil is a contactless charging coil wound many times in a circular ring shape to perform contactless charging with the coil of the charging pad and electromagnetic induction.

The second coil performs short-range wireless communication with the coil of the external short-range wireless communication device with electromagnetic induction, and is wound on the same plane as the first coil and wound a plurality of times in a rectangular annular shape surrounding the first coil. Coil for wireless communication.

The first shielding body is stacked between the battery in contact with one side of the first coil and is formed over an occupied space of the first coil, and has a permeability for blocking distortion of electromagnetic induction of the first coil. A branch is a shield for non-contact charging.

The second shield is stacked between the battery and in contact with one side of the second coil, and is formed on the same plane as the first shield over the space occupied by the second coil. It is a shield for short-range wireless communication, which has a permeability to block distortion of electromagnetic induction.

Preferably, the first coil, the second coil, the first shield and the second shield are embedded in the battery cover or attached to an inner surface of the battery cover.

Preferably, the first coil, the second coil, the first shield, and the second shield are attached to the battery.

Preferably, the first shield for contactless charging is sheet-like ferrite having a permeability of 300 or more, and the second shield for short-range wireless communication is sheet-shaped ferrite having a permeability of 100 to 160.

According to the mobile communication terminal according to the present invention, in an environment in which contactless charging and short-range wireless communication are mounted on a mobile communication terminal, a coil for contactless charging, a coil for short-range wireless communication, a shield for a contactless charging coil, and a short-range wireless communication coil The shield can be installed on the battery cover or battery with a minimum thickness. Also, in applying the shield to the coil for contactless charging and the coil for short-range wireless communication, the shielding effect of the shield is applied by applying a shield that is separately tailored to the characteristics of each coil. It can be maximized.

1 is a schematic diagram of an exemplary mobile communication terminal in accordance with the present invention;
2 is a schematic cross-sectional view of a battery cover applied to a mobile communication terminal of the present invention;
3 is a schematic cross-sectional view of a battery applied to a mobile communication terminal of the present invention;
4 is a layout view of a coil applied to a mobile communication terminal of the present invention;
5 is a layout view of a shield applied to a mobile communication terminal of the present invention;
6 is a schematic diagram of a contactless charging system by general electromagnetic induction,
7 is a schematic cross-sectional view of a conventional contactless charging system applied to a mobile phone,
Figure 8 is a schematic diagram of a general coil connection of contactless charging and short-range wireless communication applied to a mobile phone.

Hereinafter, a battery cover for a mobile communication terminal according to the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

The mobile communication terminal 1 (eg, a mobile phone) according to the present invention is a terminal capable of performing contactless charging and short-range wireless communication. In the mobile communication terminal 1 of the present invention, as shown in FIG. 1, a battery 7 for power supply is mounted, and a charging circuit 8 (the charging circuit may be mounted on a battery cover) and an NFC chip. (9) is provided.

According to a feature of the present invention, the mobile communication terminal 1 of the present invention includes a battery cover 10, a first coil 20, a second coil 30, a first shield 40 and a second shield 50. It includes.

The battery cover 10, like the well-known battery cover for the mobile communication terminal, is normally opened and closed on the rear of the mobile communication terminal for the replacement of the battery 7, mainly to match the design of the mobile communication terminal (1). Molded from plastic synthetic resin.

The first coil 20, the second coil 30, the first shield 40 and the second shield 50 may be attached to the inner surface of the battery cover 10 (surface in contact with the battery), When the battery cover 10 is injection molded into a plastic synthetic resin, the battery cover 10 may be embedded in the battery cover 10 by in-mold molding, or may be attached to the battery 7 toward the battery cover 10.

2 is an example in which the coils 20 and 30 and the shields 40 and 50 are embedded in the battery cover 10, and FIG. 3 is an example attached to the battery 7.

The first coil 20 is a non-contact charging coil, the secondary for performing contactless charging with electromagnetic induction between the coil (4: primary coil) of the charging pad 3 shown in FIG. It is a coil, and as shown in FIG. 4, for example, it is the shape which wound the conductive thin film (copper foil) many times in circular ring shape.

For example, the first coil 20 may have an outermost diameter R1 of approximately 37 mm, a width W of each of the patterns wound several times, approximately 1 mm, and an innermost diameter R2 of approximately 16 mm or less. It can be formed in the shape wound up to within.

On both ends of the first coil 20, terminal connection portions 21 for electrically connecting with the charging circuit 8 installed in the main body of the mobile communication terminal are formed, respectively, and thus the battery cover 10: ) Or a battery (in the case of the embodiment of FIG. 3) to the mobile communication terminal 1 of the present invention, both ends of the first coil 20 are electrically connected to the charging circuit 8 so that the coil of the charging pad 3 The battery 7 can be charged by the induced electromotive force generated between (4: primary coil).

As shown in FIG. 1, the second coil 30 is short-range wireless communication by electromagnetic induction between the coil 6 and the coil 6 included in the external short-range wireless communication device 5 such as an RF reader or an RF tag. Coil to run.

As shown in FIG. 4, the second coil 30 has a rectangular annular shape surrounding the first coil 20 to form a conductive thin film (copper foil) with a first coil 20 having an outermost diameter R1 of 37 mm. 45mm * 45mm on the outer shell, and the width can be formed by winding within 4 times within 0.7mm.

If the external short-range wireless communication device 5 is for example an RF reader and the NFC chip 9 of the mobile communication terminal 1 of the present invention is electromagnetically induced by the RF reader, the coil 6 of the RF reader is the primary coil. And the second coil 30 becomes a secondary coil. When the RF tag is electromagnetically induced by the NFC chip 9 as an RF tag, for example, the external short-range wireless communication device 5 becomes the primary coil, the coil installed in the RF tag. (6) becomes a secondary coil.

Terminal connectors 31 for electrically connecting the NFC chip 9 are also formed at both ends of the second coil 30, and thus, the battery cover 10 (in the embodiment of FIG. 2) or the battery (in FIG. In the case of the specific embodiment), the both ends of the second coil 30 are electrically connected to the NFC chip 9 when the mobile communication terminal 1 of the present invention is connected to, for example, the coil 6 of the RF reader 5. Induction electromotive force is generated between the NFC chip 9 and the RF reader can perform short-range wireless communication.

The first coil 20 and the second coil 30 are disposed on the same plane (first plane). That is, as shown in FIGS. 1 to 4, a circular annular first coil 20 is disposed at the center, and a quadrangular annular second coil 30 is connected to the first coil 20. It is disposed to surround the circumference of the first coil 20 in the same plane.

Although two coils 20 and 30 are installed in the mobile communication terminal 1 of the present invention, the thicknesses of the coils can be minimized as these coils are disposed on the same plane (first plane).

The first coil 20 and the second coil 30 are formed of a conductive thin film (for example, 0.0175 mm (0.5 oz.) To 0.070 mm (2 oz.) Thick in a base thin film (0.025 mm or less in thickness) such as a polyimide film. Copper foil) may be integrally formed by etching the conductive thin film in a coil pattern of the first coil 20 and the second coil 30.

As described above, the coils 20 and 30 applied to the mobile communication terminal 1 of the present invention induce electromagnetic radiation between the charging pad 3 and the external short range wireless communication device 5 such as an RF reader. In addition, the application of a shield to prevent the electromagnetic induction (interference) due to the metal component included in the battery (7) or the permanent magnet applied to the charging pad (3), the mobile communication terminal (1) of the present invention Rather than applying a shield having a single characteristic to the first coil 20 and the second coil 30, the second coil 30 and the second coil 30 have different characteristics to suit the respective characteristics of the first coil 20 and the second coil 30. Apply a shield of.

First, as shown in FIG. 5, the first shield 40 for contactless charging corresponding to the first coil 20 for contactless charging is in contact with the first coil 20 and between the battery 7. They are stacked and installed over the occupied space (ie, circular) of the first coil 20.

According to the experiments of the present inventors, when the sheet-shaped ferrite having a permeability of 300 or more is applied as the first shielding body 40, the distortion of the electromagnetic induction of the first coil 20 can be effectively blocked.

Next, the second shielding body 50 for short-range wireless communication corresponding to the second coil 30 for short-range wireless communication is laminated between the battery 7 and the second coil 30 in contact with the second coil 30, as shown in FIG. The second coil 30 is provided over the space occupied by the space occupied by the center (that is, the rectangle penetrated circularly).

According to the experiments of the present inventors, when the sheet-shaped ferrite having a permeability of 100 to 160 is applied as the second shielding body 50, the distortion of the electromagnetic induction of the second coil 30 can be effectively blocked.

As such, the first shielding body 40 and the second shielding body 50 are stacked in contact with each of the first coil 20 and the second coil 30 on the same plane (first plane). As shown in Fig. 3, the first shield 40 and the second shield 50 are also disposed on the same plane (second plane).

The laminated structure of the 1st coil 20, the 2nd coil 30, the 1st shield 40, and the 2nd shield 50 contained in the mobile communication terminal 1 of this invention is a double-sided adhesive sheet, for example. The first coil 20 and the second coil 30 are formed (attached) on one side of the 60, and on the other side of the double-sided adhesive sheet 60 of the thin film at a position corresponding to the first coil 20. The first shield 40 can be formed by attaching the second shield 50 to the position corresponding to the second coil 30, respectively, and the laminated structure thus formed is attached to the inner surface of the battery cover 10. Alternatively, when the battery cover 10 is ejected, the battery cover 10 may be embedded in the battery cover 10 or attached to an outer surface of the battery 7.

The laminated structure of the 1st coil 20, the 2nd coil 30, the 1st shield 40, and the 2nd shield 50 which were formed as mentioned above is a thing of the 1st coil 20 and the 2nd coil 30. As shown in FIG. When the thickness becomes 0.15 mm or less and the thicknesses of the first shield 40 and the second shield 50 become 0.15 mm or less, the coils 20 and 30 and the shield (in the mobile communication terminal 1 of the present invention) ( Since the total thickness occupied by the 40 and 50 becomes 0.3 mm or less, an increase in size (thickness) due to the application of the coils 20 and 30 and the shields 40 and 50 to the battery cover 10 or the battery 7 can be achieved. In addition, in applying the shields 40 and 50 to the coils 20 and 30, the shielding effect of the shield may be improved by separately applying shields tailored to the characteristics of each coil.

1: mobile communication terminal of the present invention
3: charging pad
4: coil of charging pad
5: External short range wireless communication device (e.g. RF reader)
6: coil of external short-range wireless communication device
7: battery
8: charging circuit
9: NFC chip
10: battery cover
20: first coil for contactless charging
21, 31: terminal connection
30: second coil for short range wireless communication
40: first shield for contactless charging
50: second shield for short range wireless communication
60: double sided adhesive sheet

Claims (3)

In a mobile communication terminal capable of contactless charging and short-range wireless communication,
A battery cover 10 opened and closed to replace the battery 7;
A first coil 20 for contactless charging, which performs contactless charging with the coil 4 of the charging pad 3 and electromagnetic induction and is wound a plurality of times in a circular ring shape;
A rectangular ring that performs near field communication with the coil 6 of the external short-range wireless communication device 5 and electromagnetic induction and is coplanar with the first coil 20 and surrounds the first coil 20. A second coil 30 for short-range wireless communication wound several times in a shape;
It is stacked between the battery 7 in contact with one side of the first coil 20, formed over the occupied space of the first coil 20, distortion of the electromagnetic induction of the first coil 20 Contactless charging first shield 40 having a magnetic permeability to block; And
It is stacked between the battery 7 in contact with one side of the second coil 30, is formed on the same plane with the first shield 40 over the occupied space of the second coil 30, A second shield 50 for short-range wireless communication having a permeability to block distortion of electromagnetic induction of the second coil 30;
Mobile communication terminal capable of contactless charging and short-range wireless communication, comprising a. The method of claim 1,
The first coil 20, the second coil 30, the first shield 40 and the second shield 50 are embedded in the battery cover 10 or the battery cover 10. Mobile communication terminal capable of contactless charging and short-range wireless communication, characterized in that attached to the inner surface of the. The method of claim 1,
The first coil 20 and the second coil 30 and the first shield 40 and the second shield 50 is attached to the battery 7, the contactless charging and Mobile communication terminal capable of short range wireless communication.

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