JP2002246250A - Electromagnetic coupling coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic coupling coil that can induce voltage at pluralities of reception coils existing in a wide range, and at the same time can reduce electric field strength without increasing the opening area of a transmission coil. SOLUTION: In this electromagnetic coupling coil, the transmission and reception coils 102 and 101 are provided, power is fed to the transmission coil 102, and voltage induced at the reception coil 101 for electromagnetic coupling for taking out the voltage. In this case, the transmission coil 102 has the same number of coil-shaped portions 102a as the reception coil 101 where the voltage is induced, and the coil-shaped portion 102a is connected by a parallel wire so that the direction where current flows is reversed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic coupling coil having a transmission coil and a reception coil, supplying power to the transmission coil, and extracting voltage by inducing a voltage in the reception coil. .

[0002]

2. Description of the Related Art Conventionally, electromagnetic coupling coils are disclosed in
What is described in 000-215282 is known.

FIG. 6A is a configuration diagram showing a conventional electromagnetic coupling coil, and FIG. 6B is a configuration diagram showing another example of a conventional electromagnetic coupling coil.

In FIG. 6, reference numerals 36 and 37 denote electromagnetic coupling coils, 36a and 37a denote transmission coils, 36b, 37b and 3
7c is an electric field reduction coil. Note that the receiving coil is not shown.

The electromagnetic coupling coil 36 shown in FIG. 6 (a) is an electric field reduction coil 3 supplied with electric power having a phase opposite to that of the transmission coil 36a so as to cancel the electric field of the transmission coil 36a.
6b, which is characterized in that the total electric power is reduced by canceling out the electric field generated by the transmission coil 36a. However, since the transmission coil 36a for canceling the electric field and the electric field reduction coil 36b are arranged adjacent to each other, if a plurality of reception coils receiving the induction of voltage are arranged at distant positions, one transmission coil is used. However, since a voltage cannot be induced at the same time, a plurality of power transmitting transmission coils are required (that is, it is necessary to increase the opening area of the transmission coil), and as a result, the electric field intensity increases. .

The electromagnetic coupling coil 37 shown in FIG.
Is composed of a transmission coil 37a and electric field reduction coils 37b and 37c supplied with electric power of opposite phase to the transmission coil 37a so as to cancel the electric field. The total electric power is reduced by canceling the electric field generated by the transmission coil 37a. It is characterized by things. However, there was the same problem as in FIG.

[0007]

As described above, in the conventional electromagnetic coupling coil, it is possible to simultaneously induce voltages in a plurality of reception coils located at distant positions by increasing the opening area of the transmission coil. However, there is a problem that the electric field intensity is increased by increasing the opening area.

[0008] In this electromagnetic coupling coil, there is even a demand for reducing the electric field intensity while inducing a voltage in a plurality of reception coils existing in a wide range without increasing the opening area of the transmission coil.

According to the present invention, in order to satisfy this demand, it is possible to induce a voltage in a plurality of reception coils existing in a wide range and to reduce an electric field intensity without increasing an opening area of a transmission coil. It is an object to provide a coupling coil.

[0010]

In order to solve this problem, an electromagnetic coupling coil according to the present invention has a transmission coil and a reception coil, supplies power to the transmission coil, and induces a voltage in the reception coil. In the electromagnetic coupling coil that performs electromagnetic coupling, the transmission coil has the same number of coil-shaped portions as the reception coil from which voltage is induced, and the coil-shaped portions are parallel wires so that the direction of current flow is reversed. It is provided with the configuration connected by.

Thus, it is possible to obtain an electromagnetic coupling coil that can induce a voltage in a plurality of reception coils existing in a wide range and reduce the electric field strength without increasing the opening area of the transmission coil.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electromagnetic coupling coil according to a first aspect of the present invention has a transmission coil and a reception coil, supplies power to the transmission coil, and extracts voltage by inducing a voltage in the reception coil. In the electromagnetic coupling coil that performs coupling, the transmitting coil has the same number of coil-shaped portions as the receiving coil from which a voltage is induced, and the coil-shaped portions are connected by parallel wires so as to reverse the direction of current flow. It is what you have decided.

With this configuration, the direction of current flow is alternately reversed in the plurality of coil-shaped portions of the transmitting coil, each of which corresponds to the plurality of receiving coils. When present in a position, a voltage can be induced in a plurality of receiving coils existing in a wide range, and an electric field strength is reduced by generating electric fields that cancel each other.

According to another aspect of the present invention, there is provided an electromagnetic coupling coil having a transmitting coil and a plurality of receiving coils, supplying power to the transmitting coil, and performing electromagnetic coupling for extracting a voltage by inducing a voltage in the receiving coil. In the coil, each of the plurality of receiving coils is disposed at a position apart from the transmitting coil, the transmitting coil is disposed at a position facing the receiving coil, and has a coil-shaped portion having a greater number of coil shapes than the plurality of receiving coils, The coil-shaped portions are made of wires parallel to each other. Half of the coil-shaped portions are connected so that current flows in the forward direction, and half of the coil-shaped portions are connected so that current flows in the reverse direction.

According to this configuration, a current flows in the forward direction in half of the coil-shaped portions, and a current flows in the reverse direction in half of the coil-shaped portions, so that a voltage can be induced in a plurality of receiving coils existing in a wide range. In addition, it has the effect that the intensity of the electric field generated by the transmission coil is reduced.

According to a third aspect of the present invention, there is provided the electromagnetic coupling coil according to the second aspect, wherein each of the plurality of receiving coils is arranged in a plane at a remote position, and the number of the receiving coils is larger than the number of the plurality of receiving coils. The transmitting coils having the coil-shaped portions are connected in series and in a plane.

With this configuration, even if the receiving coil exists in a plane, the intensity of the electric field generated by the transmitting coil is reduced,
Since a voltage is induced in the receiving coil, there is an effect that the relationship between the optimal voltage induction and the reduced electric field strength is realized.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG.

(Embodiment 1) FIG. 1A is a configuration diagram showing a receiving coil constituting an electromagnetic coupling coil according to Embodiment 1 of the present invention, and FIG. 1B is an embodiment of the present invention. 1 is a positional relationship diagram showing a positional relationship between a reception coil and a transmission coil in the electromagnetic coupling coil according to Embodiment 1, and FIG. 1C is a configuration diagram showing a transmission coil constituting the electromagnetic coupling coil according to Embodiment 1 of the present invention.

1A to 1C, reference numeral 101 denotes a plurality of receiving coils, and 102 denotes a plurality of coil-shaped portions 102.
a and a plurality of linear portions 102b.

The arrangement, operation, and the like of the thus-configured electromagnetic coupling coil will be described.

In FIG. 1, a receiving coil 101 has a plurality of independent coils, which are arranged in a line.
A voltage is generated across a resistor connected to the coil. The transmission coil 102 is made of a single wire, and the reception coil 10
The coil-shaped portions 102a are connected so as to be supplied with power while reversing the flow of current to more than one coil-shaped portion 102a. The transmission coil 102 is characterized in that the electric field intensity in a distant place is canceled without changing the intensity of the magnetic field generated in the coil-shaped portion 102a. As a result, even when the plurality of receiving coils 101 are located apart from each other, it is possible to maintain the same voltage induction characteristics as in the case where the number of the receiving coils 101 is one, without increasing the electric field strength.

FIG. 2 is a configuration diagram showing a case where the electromagnetic coupling coil of FIG. 1 is used in a non-contact tag system.

In FIG. 2, 101 is a receiving coil similar to that of FIG. 1, 102 is a transmitting coil similar to that of FIG. 1, 201 is a non-contact tag chip describing the ID of an object to which a tag is attached, and 202 is a lead. A matching circuit for matching the write circuit 203 and the transmission coil 102, 204 is a tag, and 205 is a reader / writer.

As shown in FIG. 2, the receiving coil 10 shown in FIG.
1 is replaced with a non-contact tag chip 201, and the transmission coil 102 is connected to the read / write circuit 203 via the matching circuit 202, so that the reader / writer 205 does not have an antenna changeover switch.
Minimize the strength of the electric field created by the transmitting coil 102,
It is possible to recognize the contents of the tags 204 that are apart from each other, and a non-contact tag system can be configured.

FIG. 3 is a block diagram showing a contactless tag chip used in the contactless tag system.

In FIG. 3, 201 is a contactless tag chip, 301 is a memory, 302 is a control unit for controlling the whole,
Reference numeral 303 denotes a modulation / demodulation unit that performs a modulation / demodulation operation, and 304 denotes a rectification unit that converts a received radio wave into electric power.

The operation and the like of the non-contact tag chip thus configured will be described.

The non-contact tag chip 201 shown in FIG. 3 receives a radio wave transmitted from a reader / writer via the receiving coil 101. The received radio wave is converted into electric power in the rectifier 304, and drives the memory 301, the controller 302, and the modem 303. The driven modulation / demodulation unit 303 demodulates the signal from the reader / writer and outputs the signal to the control unit 302. When the demodulated signal is input to the control unit 302,
The control unit 302 recognizes that the received signal is a reader / writer signal, and inputs data such as the ID of the non-contact tag chip 201 in the memory 301 to the modulation / demodulation unit 303 via the control unit 302 to perform modulation. , Receiving coil 1
01 is sent back to the reader / writer.

As described above, in the present embodiment, the transmitting coil 102 has the same number of coil-shaped portions 102a as the receiving coil 101 from which a voltage is induced, and
02a is connected by parallel wires so as to reverse the direction in which the current flows, so that the current flowing direction alternates in the plurality of coil-shaped portions 102a of the transmitting coil 102 corresponding to the plurality of receiving coils 101, respectively. Since the inversion is performed, when each of the plurality of receiving coils 101 for which a voltage is induced is present at a distant position, a voltage can be induced on the plurality of receiving coils 101 existing in a wide range, and the electric field cancels each other. , The electric field strength can be reduced.

Each of the plurality of receiving coils 101 is arranged linearly or in a plane at a distance from each other, and the transmitting coil 102 is arranged at a position facing the receiving coil 101. The coil-shaped portions 102a are made of wires parallel to each other. Half of the coil-shaped portions 102a are connected so that current flows in the forward direction, and half of the coil-shaped portions 102a are connected so that current flows in the opposite direction. As a result, a current flows in the forward direction in half of the coil-shaped portions 102a, and a current flows in the reverse direction in half of the coil-shaped portions 102a.
Voltage can be induced in a plurality of receiving coils 101 existing in a wide range, and the intensity of the electric field generated by the transmitting coil 102 can be reduced.

(Embodiment 2) FIG. 4 (a) is a configuration diagram showing a receiving coil constituting an electromagnetic coupling coil according to Embodiment 2 of the present invention, and FIG. 4 (b) is an embodiment of the present invention. FIG. 2 is a configuration diagram illustrating a transmission coil constituting an electromagnetic coupling coil according to a second embodiment.

In FIG. 4, reference numeral 101 denotes a receiving coil similar to FIG. 1, reference numeral 102 denotes a transmitting coil similar to FIG. 1, and reference numeral 201 denotes a non-contact tag chip similar to FIGS.

The configuration, operation, and the like of the thus-configured electromagnetic coupling coil will be described.

FIG. 4A shows a case where a plurality of receiving coils 101 and non-contact tag chips 201 are arranged in a plane, and FIG. 4B shows a case where a plurality of transmitting coils 102 of FIG. -Contact tag chips 2 connected in a plane and arranged in a plane
The case where the coil-shaped portion 102a (see FIG. 1) of the transmission coil 102 is arranged at a position corresponding to 01 is shown. These form an electromagnetic coupling coil according to the present embodiment. By supplying power to the transmission coil 102, the contents of the plurality of non-contact tag chips 201 can be simultaneously recognized at one power supply point. The transmission coil 102
Has a configuration similar to that of the transmission coil 102 in FIG. 1, and thus enables tag chip recognition in a state in which an increase in power is kept to a minimum.

FIG. 5 is a block diagram showing a non-contact tag system using the electromagnetic coupling coil of FIG.

In FIG. 5, reference numeral 205 denotes a reader / writer similar to that of FIG. 2, reference numeral 501 denotes a belt conveyor, reference numeral 102 denotes a transmission coil similar to that of FIG. 4, and reference numeral 503 denotes a reception coil 101 and a non-contact tag chip 201 of FIG. It is a product.

From the reader / writer 205 to the transmission coil 102
When power and information are transmitted to the product 503 flowing at a constant interval on the belt conveyor 501 via the
The tag affixed above receives power and information. Then, when the reader / writer 205 receives the ID in the non-contact tag chip 201 via the transmission coil 102, the contents of the product 503 can be recognized with a minimum electric field.

In this embodiment, the case where the electromagnetic coupling coil shown in FIG. 4 is used for a non-contact tag system has been described.
The application of the electromagnetic coupling coil according to the present invention is not limited to this, and other systems can be similarly applied as long as power transmission is performed using magnetic field coupling.

As described above, in the present embodiment, each of the plurality of receiving coils 101 is arranged in a plane at a position apart from each other, and the transmitting coil 102 having a larger number of coil-shaped portions 102a than the plurality of receiving coils 101 is formed. By being connected in series and in a plane, even if the reception coil 101 exists in a plane, the intensity of the electric field generated by the transmission coil 102 can be reduced, and a voltage can be induced in the reception coil 101. An optimal relationship between the induction of a voltage and the reduced electric field strength can be realized.

[0041]

As described above, the electromagnetic coupling coil according to the first aspect of the present invention has a transmission coil and a reception coil, supplies power to the transmission coil, and induces a voltage in the reception coil. In the electromagnetic coupling coil that performs electromagnetic coupling that extracts a voltage, the transmitting coil has the same number of coil-shaped portions as the receiving coil from which the voltage is induced, and the coil-shaped portions are parallel so as to reverse the direction of current flow. Since the direction of current flow is alternately reversed in the plurality of coil-shaped portions of the transmitting coil corresponding to the plurality of receiving coils by being connected by a simple wire, the plurality of receiving coils which are induced with a voltage respectively. Can be induced in a plurality of receiving coils located in a wide area, and an electric field that cancels each other is generated when is located at a distance. Advantageous effect that it is possible to reduce the electric field strength can be obtained by the.

According to the second aspect of the present invention, the electromagnetic coupling coil includes a transmission coil and a plurality of reception coils, supplies power to the transmission coil, and induces a voltage in the reception coil to perform electromagnetic coupling for extracting a voltage. In the electromagnetic coupling coil,
Each of the plurality of receiving coils is arranged at a position away from the transmitting coil, and the transmitting coil is arranged at a position facing the receiving coil, and has a coil-shaped portion having a larger number of coil-shaped portions than the plurality of receiving coils. Are composed of wires parallel to each other, half of the coil-shaped parts are connected so that current flows in the positive direction, and half of the coil-shaped parts are connected so that current flows in the opposite direction. Since current flows and half of the coil-shaped portion conducts current in the opposite direction, it is possible to induce a voltage in a plurality of receiving coils existing over a wide range and reduce the intensity of the electric field generated by the transmitting coil. An advantageous effect is obtained.

According to the electromagnetic coupling coil according to the third aspect, in the electromagnetic coupling coil according to the second aspect, each of the plurality of receiving coils is arranged in a plane at a remote position,
Since the transmission coils having a larger number of coil-shaped portions than the plurality of reception coils are connected in series and in a plane, the intensity of the electric field generated by the transmission coil can be reduced even if the reception coils exist in a plane. Since a voltage can be induced in the receiving coil, an advantageous effect that an optimal relationship between the induced voltage and the reduced electric field strength can be realized can be obtained.

[Brief description of the drawings]

FIG. 1 (a) is a configuration diagram showing a reception coil constituting an electromagnetic coupling coil according to a first embodiment of the present invention. (B) Positions of a reception coil and a transmission coil in the electromagnetic coupling coil according to the first embodiment of the present invention. (C) Structural diagram showing a transmission coil constituting an electromagnetic coupling coil according to the first embodiment of the present invention

FIG. 2 is a configuration diagram showing a case where the electromagnetic coupling coil of FIG. 1 is used in a non-contact tag system.

FIG. 3 is a block diagram showing a contactless tag chip used in the contactless tag system.

FIG. 4A is a configuration diagram showing a reception coil forming an electromagnetic coupling coil according to a second embodiment of the present invention; and FIG. 4B is a configuration diagram showing a transmission coil forming an electromagnetic coupling coil according to the second embodiment of the present invention.

FIG. 5 is a configuration diagram showing a non-contact tag system using the electromagnetic coupling coil of FIG.

6A is a configuration diagram showing a conventional electromagnetic coupling coil. FIG. 6B is a configuration diagram showing another example of a conventional electromagnetic coupling coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Receiving coil 102 Transmitting coil 201 Non-contact tag chip 202 Matching circuit 203 Reader / writer circuit 204 Tag 205 Reader / writer 301 Memory 302 Control unit 303 Modulation / demodulation unit 304 Rectification unit 501 Belt conveyor 503 Product

Claims (3)

[Claims] 1. An electromagnetic coupling coil having a transmission coil and a reception coil for supplying power to the transmission coil and inducing a voltage in the reception coil to extract a voltage, wherein the transmission coil comprises: An electromagnetic coupling coil having the same number of coil-shaped portions as receiving coils from which a voltage is induced, wherein the coil-shaped portions are connected by parallel wires so as to reverse the direction of current flow. A transmission coil and a plurality of reception coils;
An electromagnetic coupling coil that supplies power to the transmission coil and performs electromagnetic coupling to extract a voltage by inducing a voltage in the reception coil, wherein each of the plurality of reception coils is disposed at a position separated from the transmission coil; The transmitting coil is disposed at a position facing the receiving coil, has a greater number of coil-shaped portions than the plurality of receiving coils, the coil-shaped portions are made of wires parallel to each other, and half of the coil-shaped portions are An electromagnetic coupling coil, wherein a current flows in a forward direction, and half of the coil-shaped portions are connected so that a current flows in a reverse direction. 3. Each of the plurality of receiving coils is arranged in a plane at a distance from each other, and the transmitting coils having a larger number of coil-shaped portions than the plurality of receiving coils are connected in series and in a plane. The electromagnetic coupling coil according to claim 2, wherein: