KR101390746B1 - Induction coil for cordless energy charging and data transfer - Google Patents

Abstract

Disclosed is an induction coil for non-contact charging and data transmission that charges a battery or uses an inductive coupling of a battery charger and a battery to transmit data without electrical contact. Wherein the induction coil is formed by stacking two or more printed circuit boards on which a predetermined circuit pattern is formed and a first end located outside the circuit pattern is electrically connected to the first end by a first connecting portion formed through the first end And a second end located inside the circuit pattern is electrically connected by a second connection formed through the second end.

Induction coil, charger, inductive coupling, printed circuit board, parallel connection

Description

[0001] Induction coils for non-contact charging and data transmission [0002]

The present invention relates to an induction coil for non-contact charging and data transmission, and more particularly, to an induction coil for non-contact charging and data transmission, which is used for charging a battery or transferring data using inductive coupling of a charger and a battery, Coil.

2. Description of the Related Art In recent years, as a portable electronic device such as a mobile phone or a digital camera, as well as various wireless electronic devices such as a robot cleaner and a wireless keyboard have been developed and popularized, the use of a battery pack serving as a power source in these products is increasing. A battery pack applied to such a product is composed of a built-in battery cell and an input / output terminal, and is charged by electrically contacting the battery pack to a special charger provided separately. However, since the size and the shape of the battery pack and the charger differ according to products or manufacturers, it is necessary not only to provide a dedicated charger corresponding to each battery pack, but also to prevent a contact failure between the battery pack and the charger, there is a problem in that a problem such as a malfunction due to a short is generated.

In order to solve this problem, a method of non-contact charging of a battery using inductive coupling between a charger and a battery has been researched. In the non-contact charging method, a primary winding of a transformer operating at a high frequency is installed in a charger, and a secondary winding of a transformer is installed in a portable mobile device such as a battery pack, Thus, the energy of the charger is supplied to the battery pack of the portable mobile device. However, the use of coils and magnetic core as inductive coupling media, such as conventional transformers, has the disadvantage that their manufacture is complicated and the bulk and weight of the charger and handheld device are increased. Accordingly, Korean Unexamined Patent Application Publication No. 2002-57469 and Registered Utility Model No. 0357251 disclose a non-contact type charging device in which the primary and secondary windings of a transformer are formed in the form of a printed circuit board (PCB). In particular, in Japanese Unexamined Patent Application Publication No. 2002-57469, there is disclosed a non-contact type charging apparatus using a pair of PCBs on which a wire-like circuit pattern is formed as a transmitting side and a receiving side of a transformer. In the registration utility model No. 0357251, Contact type charging apparatus in which a plurality of PCBs are formed by stacking a plurality of PCBs each having a plurality of PCBs formed thereon and serially connected to each other to be used as a transmitting side or a receiving side. When a plurality of the wire-like circuit patterns PCB are connected in series, the intensity of the generated magnetic field is increased, so that the amount of current to be transmitted can be increased to some extent. However, since the resistance value of the circuit pattern increases, In addition, a relatively large amount of heat and electromagnetic waves are generated to reduce the lifespan of the device, which has an undesirable effect on the human body, and the serial connection process of the PCB is complicated.

Accordingly, an object of the present invention is to provide an induction coil for noncontact charging and data transmission having an excellent power transmission efficiency and a high transmission speed. It is another object of the present invention to provide an induction coil for non-contact charging and data transmission that is easy to manufacture and mass-produce. Still another object of the present invention is to provide an induction coil for non-contact charging and data transmission which is easy to be thinned. The induction coil according to the present invention is excellent in uniformity of production quality and can be manufactured in a parallel manner rather than in series and can be made of various metal materials such as aluminum and copper, zinc, silver, gold, platinum and tin But it can be manufactured by various methods such as an etching method, a sputtering method, and a printing method.

In order to achieve the above object, the present invention provides a printed circuit board comprising a printed circuit board on which a predetermined circuit pattern is formed, wherein at least two printed circuit boards are stacked, and a first end located outside the circuit pattern is formed And the second end located inside the circuit pattern is electrically connected by a second connecting portion formed through the second end. The induction coil according to claim 1, wherein the first end of the circuit pattern is electrically connected to the second end of the circuit pattern.

The present invention also relates to a power supply device comprising: a current transmitter connected to a power source and including a primary side transmission winding for transmitting a current output from the power source; And a current receiver including a secondary-side receiving winding that is inductively coupled to the primary-side transmission winding to receive a current and charge the battery with the received current, the non-contact charging apparatus comprising: a primary- At least one winding selected from the group consisting of windings is formed by stacking two or more printed circuit boards on which a predetermined circuit pattern is formed and a first end located outside the circuit pattern passes through the first end And a second end located inside the circuit pattern is electrically connected by a second connection formed through the second end, wherein the first end of the circuit pattern is electrically connected to the second end of the circuit pattern, do.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining a configuration and a use state of a non-contact type charging apparatus according to an embodiment of the present invention. 1, a non-contact type charging apparatus according to the present invention includes a current transmitter (not shown) including a primary transmission coil 22 connected to a power source 10 for transmitting a current output from the power source 10 20); And a current receiving section 30 including a secondary receiving coil 32 for receiving the current inductively coupled to the primary transmission winding 22 and charging the battery 12 with the received current. The current receiver 30 may be integrally formed with the battery 12 to be charged or may be installed in the wireless device 14 in which the battery 12 is mounted and may be connected to the wireless device 14 As shown in Fig. Also, it is preferable that the current transmitter 20 has a pad-type structure. The current transmitter 20 and the current receiver 30 convert the commercial power source 10 to be suitable for charging the battery 12 and include various conventional electronic devices required for charging the battery 12. [ That is, the current transmitter 20 may include a conventional diode rectifier, a free volt converter, an AC / DC converter, a DC / DC converter, an inverter, And capacitors. The configuration of these elements is disclosed in detail in, for example, Japanese Unexamined Patent Application Publication No. 2002-57469, Registered Utility Model No. 0357251, and the like.

2 is an exploded perspective view for explaining a configuration of a primary side transmission winding 22 and / or a secondary side reception winding 32 in which an induction coil for non-contact charging and data transmission according to an embodiment of the present invention is used. 3a, 3b and 3c are a front view, a rear view, and an AA line side sectional view of the windings 22 and 32 used in the non-contact type charging apparatus according to the embodiment of the present invention, respectively. As shown in FIGS. 2, 3A to 3C, the windings 22 and 32 used in the non-contact type charging apparatus according to the present invention are formed by stacking two or more printed circuit boards 50, A predetermined circuit pattern 52, preferably a helical circular circuit pattern 52 or a helical rectangular circuit pattern is formed in the same shape. A first end 54 located at an outer side of both ends of the circuit pattern 52 is electrically connected by a first connecting portion 54a formed to penetrate the first end 54, The second end 56 located inside the second end portion 52 is electrically connected by the second connection portion 56a formed through the second end 56. [ The first connecting portion 54a and the second connecting portion 56a are connected to the first and second terminals 54b and 56b respectively and are connected to the power source 10 via a normal charging element as required, And is connected to the battery 12 (see Fig. 1). If the primary side transmission winding 22 and the secondary side reception winding 32 have the same shape, the power transmission efficiency is improved, which is preferable.

The primary-side transmission winding 22 and / or the secondary-side reception winding 32 are mounted on a device side that transmits data and a device that receives data, respectively, in a form similar to that shown in FIG. 1, And can be used as a drag induction coil. That is, the primary-side transmission winding 22 and / or the secondary-side reception winding 32 can be used not only for power transmission but also as an induction coil for data transmission. For example, in a method of supplying a power source having a signal interval or signal strength corresponding to predetermined data to the primary side transmission winding 22 and receiving it at the secondary side reception winding 32, (Secondary side) receiving data from the primary side (primary side). A third connecting portion 55 electrically connected to the circuit pattern 52 may be further formed in addition to the first connecting portion 54a and the second connecting portion 56a as shown in FIG. The data signal applied to the third connection section 55 is added to the currents applied to the first connection section 54a and the second connection section 56a to generate the secondary reception current 32 . Therefore, the secondary-side reception winding 32 can receive data by separating the data signal from the received current. As described above, by using three terminals including the third connection section 55, data can be transmitted more efficiently while minimizing the additional circuit. Such a data transfer function may be performed together with a charging function.

The number of the printed circuit boards 50 on which the circuit patterns 52 are formed is two or more, preferably three to fifteen, more preferably three to ten, and the number of stacks of the printed circuit boards 50 is If it is too small, the power transmission efficiency and the transmission speed may not be sufficiently improved, and even if the number of stacked layers is too large, the power transmission efficiency may be lowered. In the spiral circuit pattern 52 formed on the printed circuit board 50, the number of windings of the pattern 52 is preferably 5 to 50, more preferably 10 to 30, Is preferably 10 to 200 mm, and more preferably 20 to 80 mm. If the number of times of winding and the diameter of the pattern 52 are out of the above range, the circuit width is narrow and the impedance is increased, or the circuit width is excessively widened, thereby lowering the power transmission efficiency. The shape of the circuit pattern 52 may be a circular shape as shown in FIG. 3A, but may be formed as a square as shown in FIG. 3E, and may be a triangle, a trapezoid, a diamond And the like.

3B and 3C, on the rear surface of the lowermost printed circuit board 50 of the windings 22 and 32, a second connecting portion (not shown) for connecting the second ends 56 of the plurality of helical circuit patterns 52 And the lead wires 57 may be formed on the printed circuit board 50. The lead wires 57 may be formed on the printed circuit board 50 through the third connecting portions 58 And is connected to a second terminal 56b formed on an upper portion of the uppermost printed circuit board 50 among the plurality of the printed circuit boards 50. [ As described above, the second connecting portion 56a connected to the second end 56 of the plurality of helical circuit patterns 52 and the first connecting portion 54a connected to the first end 54 are positioned on the same plane The printed circuit board 50 can be efficiently disposed in the current transmitting section 20 and the current receiving section 30. [ 4, instead of forming the lead wires 57 on the back surface of the lowermost printed circuit board 50, a separate printed circuit board 59 on which the lead wires 57 are formed is manufactured, It may be bonded to the back surface of the lowermost printed circuit board 50 on which the second connecting portion 56a and the third connecting portion 58 are formed.

The printed circuit boards 50 and 59 used in the present invention are formed by forming a pattern of a predetermined circuit pattern 52 or lead lines 57 on a substrate made of an insulating material by a normal photo- A heat-resistant plastic film such as a flexible polyester film or a polyimide film, such as a flexible printed circuit (FPC) or a flexible copper clad laminate, It is also possible to form a pattern of the circuit pattern 52 or the lead wire 57 by a conductive material such as aluminum, platinum, nickel, zinc, silver, gold, tin or a conductive polymer. The use of the flexible copper-clad laminated film in this manner is preferable because these laminated films, that is, the printed circuit boards 50 and 59 can be easily bonded or physically laminated with an insulating adhesive. The printed circuit boards 50 and 59 used in the present invention may be formed by sputtering a conductive material on a substrate such as a heat resistant film or by evaporating a paste containing a conductive material on a substrate such as a heat resistant film Or may be produced by forming a layer of conductive material on a substrate and etching it into a predetermined shape. In this case, the conductive material included in the paste is preferably nano-sized particles. The shape of the circuit pattern can be freely configured in this manner, and the thickness of the circuit pattern can be adjusted according to the use. By controlling the circuit pattern and the circuit thickness in this way, the amount of heat generated from the printed circuit boards 50 and 59 can be controlled. In addition, it is preferable to coat a conductive material such as Si, Ag, Fe or the like on an insulating substrate such as the heat resistant film in paste form (in this case, it is preferable not to come into contact with the circuit pattern) A shielding effect may be given.

The first to third connecting portions 54a, 56a and 58 may be formed by passing through the printed circuit board 50 with a small drill or the like and filling a conductive material such as a conductive polymer or copper into the through hole .

The spiral circuit pattern 52 formed on the plurality of the printed circuit boards 50 is disposed between the first connecting portion 54a and the second connecting portion 56a, that is, between the pair of terminals 54b, 56b, respectively. All the starting points of the helical circuit pattern 52 formed on the printed circuit board 50 are connected by the first connecting portion 54a and all the end points of the helical circuit pattern 52 are connected by the second connecting portion 56a And are connected in parallel with each other. Since the helical circuit patterns 52 are connected in parallel, the resistance of the entire circuit is remarkably reduced and the power transmission efficiency is improved as compared with the case where all the helical circuit patterns 52 are connected in series. In addition, when all of the helical circuit patterns 52 are connected in series, the current flows in opposite directions on the printed circuit board 50 of the adjacent layer, whereas, as in the present invention, the helical circuit pattern 52 When all are connected in parallel, the currents move in the same direction and locus in the adjacent printed circuit board 50, so that the intensity of the current is amplified and the current transmission efficiency is improved. In the present invention, all of the printed circuit boards 50 of the same type are used, and the first connecting portions 54a, the second connecting portions 56a, Since the third connection part 58 is formed according to the first embodiment, the manufacturing process is simple and mass production is easy. In the present invention, both the primary-side transmission winding 22 and the secondary-side reception winding 32 may be formed of a laminated printed circuit board 50. However, if necessary, the primary-side transmission winding 22 and the secondary- Only one of the receiving windings 32 may be formed of the printed circuit board 50 laminated.

The non-contact type charging apparatus according to the present invention is advantageous in that it has excellent power transmission efficiency and transmission speed, and is easy to manufacture and mass-produce. In addition, the non-contact type charging apparatus according to the present invention is manufactured in the form of a thin film of pad or the like and can be applied to various battery type wireless devices. For example, the non-contact type charging apparatus can be used as a portable phone, MP3 player, PDA, Such as portable medical equipment, robots, robot cleaners, toy robots, small electric trains or automobiles, automatic vacuum cleaners, electric razors, and wireless keyboards, as well as portable electronic devices such as portable game machines and portable media players The present invention can be effectively applied to all wired / wireless devices requiring recharging by a secondary battery. In addition, it can be used for applications such as a mouse and a mouse pad that can be instantaneously charged using an instantaneous induction current.

Hereinafter, the present invention will be described in more detail with reference to specific examples. The following examples are intended to further illustrate the present invention, and the scope of the present invention is not limited by the following examples.

[Example 1]

(Circuit width) of the pattern was 0.65 mm, and the spacing distance between the patterns was 18 μm (turn), the outer diameter was 42 mm, and the thickness of the polyimide film A spiral circuit pattern having a thickness of 0.2 mm is formed and laminated in eight layers and used as a primary transmission coil of a pad-type current transmitter. On the upper part of the polyimide film having a thickness of 10 占 퐉, copper was used, the number of times of winding the pattern was 18 turns, the outer diameter was 30mm, the pattern thickness (circuit width) was 0.54mm, A helical circuit pattern having a space distance of 0.2 mm was formed and laminated in four layers to use as a secondary transmission coil of a pad type current receiving section. As a result of measuring the voltage and current output from the secondary-side reception winding while supplying the current of 0.151 A and 4.62 V to the primary-side transmission winding, the current of 0.112 A and 3.81 V was detected , And the power transmission efficiency was 61%. Here, the transmission efficiency is calculated as the% of the secondary side current x voltage value with respect to the primary side current x voltage value.

[Example 2]

The primary-side transmission coil of the pad-type current transmitter was the same as that used in the first embodiment. As the secondary-side transmission coil of the pad-type current receiving unit, a copper film was used for the upper part of the polyimide film having a thickness of 10 占 퐉, the number of times of winding the pattern was 18 turns, the outer diameter was 35mm, A spiral circuit having a thickness (circuit width) of 0.67 mm and a spatial distance between patterns of 0.2 mm Patterns are formed, and these are laminated in five layers Respectively. As a result of measuring the voltage and current output from the secondary-side reception winding while supplying the current of 0.151 A and 4.62 V to the primary-side transmission winding, the current of 0.115 A and 3.85 V was detected , And the power transmission efficiency was 63%.

[Example 3]

The primary-side transmission coil of the pad-type current transmitter was the same as that used in the first embodiment. As the secondary-side transmission coil of the pad-type current receiving portion, a copper film was used for the upper portion of the polyimide film having a thickness of 10 占 퐉, the number of times of winding the pattern was 16 turns, the outer diameter was 34mm, A rectangular circuit pattern having a thickness (circuit width) of 0.75 mm and a space distance of 0.2 mm between the patterns was formed, and these were laminated in six layers Respectively. As a result of measuring the voltage and current output from the secondary-side reception winding while supplying the current of 0.151 A and 4.62 V to the primary-side transmission winding, the current of 0.119 A and 3.88 V was detected , And the power transmission efficiency was 66%.

[Comparative Example]

The primary-side transmission coil of the pad-type current transmitter was the same as that used in the first embodiment. As the secondary-side transmission coil of the pad-type current receiving portion, a copper wire was used for the upper portion of the polyimide film having a thickness of 10 占 퐉, the number of times of winding the pattern was 16 turns, the outer diameter was 30mm, A helical circuit pattern having a thickness (circuit width) of 0.54 mm and a space distance of 0.2 mm between the patterns was formed and used as a single layer without performing the lamination step. As a result of measuring the voltage and current output from the secondary-side reception winding while supplying the current of 0.151 A and 4.62 V to the primary-side transmission winding, the current of 0.072 A and 3.10 V was detected , And the power transmission efficiency was 32%.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining the configuration and use state of an inductive coil for data transmission and non-contact charging according to an embodiment of the present invention; FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an induction coil for non-contact charging and data transmission, and more particularly,

Figures 3a, 3b and 3c are a front view, a rear view and a side cross-sectional view, respectively, of a winding used in an induction coil for non-contact charging and data transmission according to an embodiment of the present invention;

FIG. 3D is a front view of a winding used in an induction coil for data transmission according to another embodiment of the present invention. FIG.

3E is a front view of a winding used in an induction coil for non-contact charging and data transmission according to another embodiment of the present invention.

4 is a side cross-sectional view of a winding used in an induction coil for non-contact charging and data transmission according to another embodiment of the present invention.

Claims (15)

Wherein a first end located outside the circuit pattern is electrically connected by a first connection portion formed through the first end, and a second end located outside the circuit pattern is electrically connected to the second end of the printed circuit board, And a second end located inside the circuit pattern is electrically connected by a second connection portion formed through the second end. The printed circuit board according to claim 1, wherein the number of layers of the printed circuit board on which the circuit pattern is formed is 2 to 15 layers, the number of times of winding of the helical circuit pattern is 5 to 50, the outermost diameter of the helical circuit pattern is 10 to 200 mm / RTI > The induction coil according to claim 1, wherein the circuit pattern is selected from the group consisting of a spiral circular circuit pattern and a spiral rectangular circuit pattern. The printed circuit board according to claim 1, wherein the printed circuit board is formed of a conductive material selected from the group consisting of copper, aluminum, platinum, nickel, zinc, silver, gold, tin and conductive polymer, Inductive coil. [5] The method of claim 4, wherein the circuit pattern includes a method of sputtering a conductive material on a substrate by vapor deposition, a method of printing a paste containing a conductive material on a substrate, a method of forming a conductive material layer on a substrate, ≪ / RTI > is formed by at least one method selected from the group consisting of < RTI ID = 0.0 > 5. The induction coil of claim 4, wherein the printed circuit board is formed by a photolithography process. The induction coil according to claim 1, wherein the printed circuit board is a flexible copper clad laminated film. The induction coil according to claim 1, wherein the induction coil is used for data transmission. The induction coil according to claim 8, further comprising a data transfer connection portion electrically connected to the circuit pattern. A current transmitter connected to a power source and including a primary side transmission winding for transmitting a current output from the power source; And And a current receiving portion including a secondary-side receiving coil for receiving the current inductively coupled to the primary-side transmitting coil and for charging the battery with the received current, the non-contact- Wherein at least one winding selected from the group consisting of the primary side transmission winding and the secondary side reception winding is formed by stacking two or more printed circuit boards on which a helical circuit pattern is formed, And a second end of the circuit pattern is electrically connected to the first end of the circuit pattern by a second connection portion formed through the second end, Is connected to the non-contact type charging device. 11. The non-contact type charging apparatus according to claim 10, wherein the current transmission unit has a pad-type structure, and the current receiving unit is formed integrally with a battery to be charged. The printed circuit board according to claim 10, wherein the first connecting portion is connected to a first terminal formed on an uppermost printed circuit board among the plurality of printed circuit boards, and a second connecting portion connecting the second ends of the plurality of circuit patterns A lead wire for drawing out the winding is formed on the rear surface of the lowermost printed circuit board of the winding, and the lead wire is connected to a third connecting portion formed through the plurality of printed circuit boards, Is connected to a second terminal formed in the non-contact type charging device. 13. The non-contact charging apparatus according to claim 12, wherein the lead wire is formed on a separate printed circuit board, and then the second connecting portion and the third connecting portion are bonded to the back surface of the lowermost printed circuit board. [10] The apparatus as claimed in claim 10, wherein the non-contact type charging device is capable of performing data transfer, and is capable of performing data transfer, such as a mobile phone, an MP3 player, a PDA, a notebook PC, a digital camera, a camcorder, a portable game machine, , Which is used in an apparatus requiring charging with at least one secondary battery selected from the group consisting of a robot cleaner, a toy robot, a small electric railcar or an automobile, an automatic vacuum cleaner, an electric razor, a wireless keyboard, . 11. The non-contact type charging apparatus according to claim 10, wherein the primary side transmission winding and the secondary side reception winding have the same shape.

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