KR20130119585A - Wireless power transmitting/receiving apparatus - Google Patents

Abstract

The present invention relates to a wireless power transmitting and receiving device. The purpose of the present invention is to provide a wireless power transmitting device harmless to a user by minimizing the influence of electromagnetic fields generated from a coil in wireless power transmission. The wireless power transmitting and receiving device according to the present invention comprises a wireless power transmission unit having a primary coil to generate electromagnetic fields; and a wireless power receiving unit having a secondary coil in which an induction current is generated by the electromagnetic fields generated in the primary coil. Multiple unit coils are arranged on at least one among the primary coil and the secondary coil to form an electromagnetic wave in a desired shape for each of the unit coils by independently controlling a current supplied to each of the unit coils.

Description

Wireless power transceiver {WIRELESS POWER TRANSMITTING / RECEIVING APPARATUS}

The present invention relates to power transfer, and more particularly to wireless power transfer.

As mobile devices such as smartphones, tablets, and laptops have increased in popularity, charging issues of such mobile devices have emerged as an important issue. Mobile devices use batteries because of their characteristics. In order to charge such a battery, a battery is generally charged by receiving power from a commercial power source for home use, but a separate charger has been used until now. The mobile device and the charger are provided with contact terminals exposed to the outside, respectively, so that the two contact terminals electrically contact each other to charge the battery of the mobile device.

However, such a charging method by electrical contact may be easily contaminated with foreign matters because the contact terminals are exposed to the outside, and there is a problem in that charging is not smoothly performed due to poor contact. In order to solve this problem, research and development for charging a battery of a mobile device in a non-contact manner without a contact terminal has recently been conducted.

One of the proposed contactless charging methods is inductive coupling. Inductive coupling installs the primary circuit of a high frequency transformer in the charging matrix and the secondary circuit in a mobile device. During charging, energy is transferred from the charging mother to the portable device by magnetic coupling between the primary and secondary circuits. However, it is necessary to suppress the electromagnetic field around the coil because the electromagnetic field generated by the inductive coupling method may have a harmful effect on the human body.

According to an aspect, an object of the present invention is to provide a wireless power transmission device that is harmless to a user by minimizing the influence of an electromagnetic field formed in a coil in wireless power transmission.

In accordance with another aspect of the present invention, there is provided a wireless power transmission / reception apparatus comprising: a wireless power transmitter having a primary coil for generating an electromagnetic field; A wireless power receiver having a secondary coil in which induced current is generated by an electromagnetic field generated in the primary coil; At least one of the primary coil and the secondary coil has a plurality of unit coils arranged, and the current supplied to each of the plurality of unit coils is independently controlled to form electromagnetic waves of a desired type in each of the plurality of unit coils. Can be done.

In addition, in the above-described wireless power transmission and reception apparatus, the independent control of the current may be to independently control at least one of the magnitude, direction, and phase of the current supplied to each of the plurality of unit coils.

In addition, in the above-described wireless power transceiver, a plurality of unit coils may be made of a conductive wire.

In addition, in the above-described wireless power transceiver, a plurality of unit coils may be made in a pattern form on a printed circuit board.

In addition, in the above-described wireless power transceiver, a plurality of unit coils may be arranged to form a row and a column.

In addition, in the above-described wireless power transmission and reception apparatus, a plurality of unit coils may be arranged to form a square.

In addition, in the above-described wireless power transmission and reception apparatus, a plurality of unit coils may be made to have the same shape.

In addition, in the above-described wireless power transmission and reception apparatus, the plurality of unit coils may all be made to have a different shape.

In addition, in the above-described wireless power transceiver, the plurality of unit coils may be at least one of a rectangle, a circle, and a spiral.

According to one aspect, the wireless power transmission to provide a wireless power transmission device harmless to the user by minimizing the influence of the electromagnetic field formed in the coil.

1 is a view showing an application example of a wireless power transceiver of a multi-coil structure according to an embodiment of the present invention.
2 is a diagram illustrating a control system of a wireless power transceiver according to an exemplary embodiment of the present invention.
3 is a view showing the configuration of a multi-coil unit according to a first embodiment of the present invention.
4 is a diagram showing the cancellation of the electromagnetic field through the control of the current direction in the multi-coil structure shown in FIG.
5 is a view showing a second embodiment of the multi-coil unit according to the present invention.

1 is a view showing an application example of a wireless power transceiver of a multi-coil structure according to an embodiment of the present invention. As shown in Fig. 1A, in order to supply power to the television 102, the set top box 104, etc., multiple coils are installed on the wall behind the television 102 instead of using the existing power line. The wireless power transmitters 108a and 108b of the structure may be wirelessly supplied with power. The wireless power transmitters 108a and 108b are composed of a multiple coil unit 108a and a power supply unit 108b. The multi-coil unit (not shown) is provided inside the television 102, and when electric power is supplied from the power supply unit 108b to the multi-coil unit 108a, the multi-coil unit 108a on the wall may be used. Power is wirelessly transmitted to the multiple coil unit by an action such as electromagnetic induction or frequency resonance. At this time, the multiple coil unit 108a on the wall becomes a wireless power transmitter, and the multiple coil unit inside the television 102 becomes a wireless power receiver. Through such a structure, it is possible to simultaneously wirelessly supply power to two or more electric devices (for example, the television 102 and the set top box 104) through one wireless power transmitter 108a.

In FIG. 1B, an application example of charging a battery of a wireless communication terminal (such as a cellular phone or a smart phone) 112 through wireless power transmission is illustrated. In the charging of the wireless communication terminal 112, the power may be wirelessly transmitted through the charging pad 118 having a separate multi-coil structure without using a conventional wired charger to charge the battery. The multi-coil unit (not shown) is provided inside the wireless communication terminal 112, and when the power is supplied to the multi-coil unit 118a of the charging pad 118, the multi-coil unit 118a performs the wireless communication terminal 112. Power is wirelessly transmitted to the internal multiple coil parts by the action of electromagnetic induction or frequency resonance. At this time, the multiple coil unit 118a of the charging pad 118 becomes a wireless power transmitter, and the multiple coil unit inside the wireless communication terminal 112 becomes a wireless power receiver. The multiple coil units 118a of the charging pad 118 may have a constant width to simultaneously charge the plurality of wireless communication terminals 112.

2 is a diagram illustrating a control system of a wireless power transceiver according to an exemplary embodiment of the present invention. As shown in FIG. 2, the apparatus for transmitting and receiving wireless power includes a wireless power transmitter 200 and a wireless power receiver 250. The wireless power transmitter 200, which is a transmitter that transmits power, includes a first rectifier 202, a first regulator 204, a high frequency generator 206, and a primary coil 208. The wireless power receiver 250, which receives power, includes a secondary coil 252, a second rectifier 254, a second regulator 256, and a battery 258.

First, the wireless power transmitter 200 receives electric power from the external power source 210 to generate an electromagnetic field in the primary coil 208. The external power source 210 supplied to the wireless power transmitter 200 is mainly commercial AC power, but may be DC power in some cases. The first rectifier 202 of the wireless power transmitter 200 converts an AC current supplied from the external power source 210 into a DC current. The first regulator 204 stabilizes the voltage of the DC current converted by the first rectifier 202. The high frequency generator 206 receives a DC current from the first regulator 204 and converts the DC current into a high frequency AC current. The primary coil 208 receives an alternating current of the high frequency generator 206 to generate an electromagnetic field. If the external power supply 210 supplying power to the wireless power transmitter 200 is a DC power supply suitable for driving the high frequency generator 206, the DC current supplied from the external power supply 210 is a high frequency generator ( 206 may be provided. In this case, the first rectifier 202 and the first regulator 204 are unnecessary.

When an electromagnetic field is generated in the primary coil 208 of the wireless power transmitter 200, an induced current is generated by the electromagnetic field generated in the primary coil 208 in the secondary coil 252 of the wireless power receiver 250. The second rectifier 254 converts the induced current generated by the secondary coil 252 into a direct current, and the second regulator 256 stabilizes the voltage of the direct current converted by the second rectifier 254. The battery 258 is charged by a DC current output from the second regulator 256.

At least one of the primary coil 208 and the secondary coil 252 (preferably both the primary coil 208 and the secondary coil 252) is composed of a plurality of unit coils, the plurality of units At least one of the magnitude, direction, and phase of the current supplied to each of the coils is independently controlled to form electromagnetic waves of a desired shape in each of the plurality of unit coils.

As described above, in the wireless charging method according to the embodiment of the present invention, an induced current is generated in the secondary coil 252 of the wireless power receiver 250 by the electromagnetic field generated in the primary coil 208 of the wireless power transmitter 200. The battery 258 is charged by this induced current. When the wireless power transmitter 200 and the wireless power receiver 250 of FIG. 2 are applied to the charging pad 118 and the wireless communication terminal 112 of FIG. 1, the wireless power transmitter 200 is provided in the charging pad 118. The wireless power receiver 250 may be a charging system and a battery provided in the wireless communication terminal 112. If applied to the television 102 of FIG. 1, the battery 258 may not be necessary.

3 is a diagram illustrating a configuration of a multiple coil unit according to a first embodiment of the present invention. The multiple coil unit 300 illustrated in FIG. 3 may be a primary coil and a secondary coil illustrated in FIG. 2. As shown in FIG. 3, in the multi-coil unit 300 according to an exemplary embodiment, a plurality of unit coils 302a, 302b, 302c, and 302d are arranged, and the plurality of unit coils 302a are arranged. The current supplied to each of 302b, 302c, and 302d is independently controlled so that electromagnetic waves of a desired type are formed in each of the plurality of unit coils 302a, 302b, 302c, and 302d. For example, in Fig. 3, four unit coils 302a, 302b, 302c and 302d having the same number of windings are arranged in rows and columns (specifically in a 2x2 square). (300) is shown. The plurality of unit coils 302a, 302b, 302c, and 302d of the multiple coil unit 300 may independently control at least one of the magnitude, direction, and phase of the current supplied to each of the plurality of unit coils 302a, 302b, 302c, and 302d.

FIG. 4 is a diagram illustrating the cancellation of electromagnetic fields through the control of the current direction in the multi-coil structure shown in FIG. 3. In the multiple coil part 300 of FIG. 4, the plurality of unit coils 302a, 302b, 302c, and 302d are schematically illustrated to simplify the winding form in order to express the direction of the current and the direction of the electromagnetic field.

표시는 4개의 단위 코일(302a)(302b)(302c)(302d) 각각의 주변에 형성되는 전자기장의 방향을 나타낸 것이다. 도 4의 (A)와 같은 코일 배치 구조에서,

는 4개의 단위 코일(302a)(302b)(302c)(302d)의 아래쪽에서 위쪽으로 향하는 전자기장의 방향을 의미하고,

는 4개의 단위 코일(302a)(302b)(302c)(302d)의 위쪽에서 아래쪽으로 향하는 전자기장의 방향을 의미한다.First, as shown in FIG. 4A, among the four unit coils 302a, 302b, 302c, and 302d arranged in a square of 2x2 form, two unit coils 302a and 302d disposed in a diagonal direction. ) Are supplied in the same direction to each other, and the other two unit coils 302b and 302c are also supplied in the same direction to each other. However, the current directions of the aforementioned two unit coils 302a and 302d and the two unit coils 302b and 302c mentioned later are opposite to each other. For example, when the current directions of the two unit coils 302a and 302d mentioned above are counterclockwise (CCW), the current direction of the two unit coils 302b and 302c mentioned later is clockwise ( CW). Conversely, when the current directions of the two unit coils 302a and 302d mentioned above are clockwise CW, the current direction of the two unit coils 302b and 302c mentioned later is a counterclockwise CCW. Can be. In FIG. 4A, the current directions of the two unit coils 302a and 302d mentioned above are counterclockwise (CCW), and the current directions of the two unit coils 302b and 302c mentioned later are clockwise. The case of the direction CW is shown. Shown in Fig. 4A

The mark shows the direction of the electromagnetic field formed around each of the four unit coils 302a, 302b, 302c and 302d. In the coil arrangement structure as shown in Fig. 4A,

Means the direction of the electromagnetic field from the bottom of the four unit coils 302a, 302b, 302c, 302d upwards,

Denotes the direction of the electromagnetic field from the top to the bottom of the four unit coils 302a, 302b, 302c and 302d.

)은 전류의 방향이 시계 방향(CW)일 때의 전자기장의 방향이고, 점선으로 표시된 방향(

)은 전류의 방향이 반시계 방향(CCW)일 때의 전자기장의 방향이다. 즉, 2개의 단위 코일(302a)(302d)의 주변에는 점선으로 표시된 방향의 전자기장이 형성되고, 다른 2개의 단위 코일(302b)(302c)의 주변에는 실선으로 표시된 방향의 전자기장이 형성된다. 또한, 4개의 단위 코일(302a)(302b)(302c)(302d) 각각의 중심에도 전류의 방향에 따라 그 방향이 결정되는 전자기장이 형성된다. 다만, 4개의 단위 코일(302a)(302b)(302c)(302d) 각각의 중심에 형성되는 전자기장은 유도 전류의 생성에 관여하지만, 4개의 단위 코일(302a)(302b)(302c)(302d) 각각의 주변에 형성되는 전자기장은 이웃한 다른 단위 코일의 주변에 형성되는 전자기장과 서로 상쇄되어 소멸될 수 있다.When the current direction is the same, an electromagnetic field is formed inside and outside each of the four unit coils 302a, 302b, 302c, and 302d according to the direction of the current. In FIG. 4B, directions of electromagnetic fields formed around each of the four unit coils 302a, 302b, 302c, and 302d are shown. References to those directions are shown in FIG. same. For reference, in FIG. 4B, the direction indicated by the solid line (

) Is the direction of the electromagnetic field when the current direction is clockwise (CW), and the direction indicated by the dotted line (

) Is the direction of the electromagnetic field when the direction of the current is counterclockwise (CCW). That is, electromagnetic fields in the direction indicated by the dotted lines are formed around the two unit coils 302a and 302d, and electromagnetic fields in the direction indicated by the solid line are formed around the other two unit coils 302b and 302c. In addition, an electromagnetic field is also formed in the center of each of the four unit coils 302a, 302b, 302c, and 302d depending on the direction of the current. However, the electromagnetic field formed at the center of each of the four unit coils 302a, 302b, 302c and 302d is involved in the generation of the induced current, but the four unit coils 302a, 302b, 302c and 302d The electromagnetic fields formed around each other may be canceled out by canceling each other with the electromagnetic fields formed around the neighboring unit coils.

In FIG. 4B, the electromagnetic field 410 indicated by the dotted line is generated by the unit coils 302a and 302d, and is compared to the unit coils 302a and 302d in comparison with other electromagnetic fields of the unit coils 302a and 302d. Is an electromagnetic field that is formed at a relatively greater distance from In addition, the electromagnetic field 420 is generated by the unit coils 302b and 320c, and is formed at a relatively longer distance from the unit coils 302b and 302c than other electromagnetic fields of the unit coils 302b and 302c. Is the electromagnetic field. Likewise, electromagnetic fields formed at relatively long distances by each of the four unit coils 302a, 302b, 302c, and 302d are also formed around each of the four unit coils 302a, 302b, 302c, and 302d. Of course, it can be offset to some extent the other electromagnetic field.

In the structure of the multiple coil unit 300 shown in Figs. 3 and 4, if the phase of each of the unit coils 302a, 302b, 302c and 302d is independently controlled, the unit coils 302a and 302b are controlled. It is possible to control the direction of the electromagnetic field formed by each of the 302c and 302d. Through the direction control of the electromagnetic field, the shape of the electromagnetic field formed in the multi-coil unit 300 may be implemented in a desired form.

5 is a view showing a second embodiment of the multi-coil unit according to the present invention. First, as shown in FIG. 5A, a single coil may be configured by arranging square coils or circular coils in rows and columns. In addition, as shown in Fig. 5B, a square spiral coil or a circular spiral coil may be arranged in a row and a column to form one multiple coil part. In addition, as shown in FIG. 5C, a plurality of coil units may be configured by combining unit coils having various shapes other than the same shape in an appropriate size. In addition, such a multi-coil unit may be made using a conductive wire, or may be manufactured in a pattern form on a printed circuit board (PCB).

102: television
104: set top box
108a, 118a, 300: multiple coil part
108b: power supply
112: wireless communication terminal
118: charging pad
200: wireless power transmitter
202, 254: rectifier
204, 256: regulator
206: high frequency generation circuit
208: primary coil
250: wireless power receiver
252: secondary coil
258: battery
302a, 302b, 302c, 302d: plural unit coils

Claims (9)

A wireless power transmitter having a primary coil for generating an electromagnetic field;
A wireless power receiver having a secondary coil in which an induced current is generated by an electromagnetic field generated in the primary coil;
At least one of the primary coil and the secondary coil,
A plurality of unit coils are arranged, the current supplied to each of the plurality of unit coils is independently controlled so that the electromagnetic wave of the desired type to form each of the plurality of unit coils. The method of claim 1,
The independent control of the current, the wireless power transmission and reception device that independently controls at least one of the magnitude, direction, and phase of the current supplied to each of the plurality of unit coils. The method of claim 1,
The wireless power transceiver of the plurality of unit coils are made of a conductive wire. The method of claim 1,
And a plurality of unit coils are formed in a pattern on a printed circuit board. The method of claim 1,
And a plurality of unit coils arranged in rows and columns. The method of claim 1,
And a plurality of unit coils arranged in a square shape. The method of claim 1,
Wireless power transmitting and receiving device formed such that the plurality of unit coils all have the same shape. The method of claim 1,
Wireless power transmitting and receiving device formed such that the plurality of unit coils all have a different shape. The method of claim 1,
And a plurality of unit coils are at least one of a rectangle, a circle, and a spiral.

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