JP5116858B2 - Non-contact transmission device and induction heating cooker - Google Patents

Description

  The present invention relates to a non-contact transmission device that transmits electric power and data between two electric circuits in a non-contact manner using electromagnetic induction, and an induction heating cooker including the non-contact transmission device.

  In a conventional system for transmitting motion on a rotating object or straight animal body by electrode contact or wiring such as slipping, the reliability could not be improved due to the problem of deterioration of aged characteristics due to adverse environment or repeated mechanical stress. As a device for transmitting power and information to a rotating or linearly moving object by high-frequency electromagnetic induction without contact, a transmission device in which a pair of high-frequency pot cores are respectively wound for power and information transmission The configuration and structure are disclosed (see Patent Document 1).

  In the wireless power transmission device, the assembling of the fixed coupler and the operating coupler is poor, the waterproofness and heat dissipation cannot be secured, and long-term insulation cannot be maintained, and water and oil are scattered. In order to solve the problem that it is difficult to use in the environment, it is easy to assemble, and the resin mold ensures waterproofness and heat dissipation, as well as maintaining long-term insulation. As a wireless power transmission device that can be used in an environment in which air scatters, a technique of using an assembly having a power transmission coil and a signal transmission coil and a ferrite core is disclosed (see Patent Document 2).

Japanese Patent Laid-Open No. 8-222259 (pages 3 to 6, FIG. 1 and FIG. 2) Japanese Patent Laid-Open No. 9-83414

  The prior art described in Patent Document 1 is intended for power transmission and information transmission (hereinafter also referred to as data transmission or data communication) to a rotating body, but the structure described here is for power transmission. A coil is arranged inside a pair of pot cores, and a coil for information transmission is arranged inside another pair of small pot cores. That is, the power transmission coil and the information transmission coil are not integrated, but are two completely independent structures. Moreover, in this prior art, the distance between the information transmission coil and the information reception coil cannot be changed due to the structural constraints as described above. For this reason, it is structurally difficult to transmit power and information signals in a non-contact manner from a device that is somewhat distant from the device.

  Moreover, in the prior art described in Patent Document 2, power transmission and data communication are properly performed only when the power transmission and reception coils and the data communication coil are opposed to each other and the facing interval is 5 to 10 mm. is there. That is, when the facing distance is 0 to 5 mm, power transmission and data communication are not properly performed. Furthermore, since the opposing coils are fixed with a resin mold, there is a problem in that power transmission and data communication are not appropriately performed when the opposing coils are misaligned. Therefore, it is difficult to apply to a device in which the facing distance constantly changes and a slight deviation occurs between the coils.

  In the prior art described in Patent Document 1, since it is not assumed that the transmitting side and the receiving side of the opposing power transmission coils are separated, a data communication coil is installed above the pair of opposing power transmission coils. The coil for power transmission and the coil for data communication are structurally separated. For this reason, there is a great limitation in the degree of freedom of installation, such as the distance between the power transmission reception side and the transmission side cannot be separated, and removal is impossible. In Patent Document 2, power transmission and data communication are possible only when the distance between the opposing transmission coils is 5 to 10 mm, but there is a problem that transmission is impossible in the proximity range of 0 to 5 mm.

  The present invention has been made in order to solve the above-described conventional problems, and aims to reduce the size of the power transmission coil and the data communication coil, and the opposing distance between the primary side coil and the secondary side coil. Is intended to provide a non-contact transmission device and an induction heating cooker that can transmit with high efficiency in the range of 0 to 10 mm.

  A non-contact transmission device according to the present invention includes a transmission unit and a reception unit arranged in a non-contact manner with the transmission unit. The transmission unit includes a first functional unit that supplies power and data, and a first unit. And a first magnetic body that is interposed between the first inner coil and the first outer coil and separates both magnetic fields in a single structure. A coil structure, a second inner coil, a second outer coil, and a second magnetic body that is interposed between the second inner coil and the second outer coil and separates both magnetic fields. A second coil structure having an integral structure; a power supply unit that receives power output from the first functional unit and outputs the power to the first coil structure and the second coil structure; Modulating transmission data output from the functional unit of the first coil structure and second coil structure One of the first inner coil and the first outer coil is connected to the power supply unit according to the distance between the first communication unit to be output and the transmission unit and the reception unit, and the other is connected to the first communication unit. Or a first switching unit that connects either the second inner coil or the second outer coil to the power supply unit and connects the other to the first communication unit. A second functional unit that operates based on data from the first functional unit, a third inner coil, a third outer coil, and a third inner coil and a third outer coil. And a third magnetic body that separates both magnetic fields, and one of the third inner coil and the third outer coil receives power from the transmitter by electromagnetic induction and 1 current is generated, and the other receives a data signal by electromagnetic induction from the transmitter and receives a second current. A third coil structure produced, a fourth inner coil, a fourth outer coil, and a fourth inner coil interposed between the fourth inner coil and the fourth outer coil to separate both magnetic fields. One of the fourth inner coil and the fourth outer coil receives electric power from the transmitter by electromagnetic induction to generate a third current, and the other is the transmitter. A fourth coil structure that receives a data signal by electromagnetic induction and generates a fourth current; a power receiving unit that extracts power from the first current or the third current and supplies the power to the second functional unit; The data signal is extracted from the second current or the fourth current, demodulated to reproduce the data, and synchronized with the connection switching operation of the first switching unit and the second communication unit that supplies the data to the second function unit Then, the first current is sent to the power receiving unit, and the second current is sent to the second communication unit. In addition, either one of the third inner coil and the third outer coil is connected to the power receiving unit, and the other is connected to the second communication unit, or a third current is sent to the power receiving unit. A second switching unit that connects one of the fourth inner coil and the fourth outer coil to the power receiving unit and connects the other to the second communication unit so as to send current to the second communication unit; , With.

  According to the present invention, the non-contact transmission device includes a transmission unit and a reception unit arranged in non-contact with the transmission unit, and the transmission unit includes a first functional unit that supplies power and data, A first inner coil, a first outer coil, and a first magnetic body that is interposed between the first inner coil and the first outer coil and separates both magnetic fields in an integrated structure. A first coil structure, a second inner coil, a second outer coil, and a second magnetic body that is interposed between the second inner coil and the second outer coil and separates both magnetic fields. , And a power source unit that receives power output from the first functional unit and outputs this power to the first coil structure and the second coil structure, The transmission data output from the first functional unit is modulated to convert the data signal into the first coil structure and the second coil structure. One of the first inner coil and the first outer coil is connected to the power supply unit according to the distance between the first communication unit that outputs to the body, the transmission unit, and the reception unit, and the other is the first communication. Or a first switching unit that connects one of the second inner coil and the second outer coil to the power supply unit and connects the other to the first communication unit. The unit includes a second functional unit that operates based on data from the first functional unit, a third inner coil, a third outer coil, and a third inner coil and a third outer coil. And a third magnetic body that separates both magnetic fields in an integrated structure, and one of the third inner coil and the third outer coil receives power from the transmitter by electromagnetic induction. The first current is generated, and the other receives the data signal from the transmitter by electromagnetic induction and receives the second current. A third coil structure for generating a fourth coil, a fourth inner coil, a fourth outer coil, and a fourth coil that is interposed between the fourth inner coil and the fourth outer coil to separate both magnetic fields. The magnetic body is integrated with one another, and either the fourth inner coil or the fourth outer coil receives power from the transmitter by electromagnetic induction to generate a third current, and the other transmits. A fourth coil structure that receives a data signal by electromagnetic induction from the unit and generates a fourth current, and a power receiving unit that extracts power from the first current or the third current and supplies the power to the second functional unit And a connection switching operation between the first switching unit and the second communication unit that extracts the data signal from the second current or the fourth current, demodulates and reproduces the data, and supplies the data to the second functional unit Synchronously, the first current is sent to the power receiving unit, and the second current is sent to the second communication unit. As described above, either one of the third inner coil and the third outer coil is connected to the power receiving unit and the other is connected to the second communication unit, or a third current is sent to the power receiving unit. The second switching unit connects one of the fourth inner coil and the fourth outer coil to the power receiving unit and connects the other to the second communication unit so as to send the current to the second communication unit. Therefore, the interference between the power supply and the data communication signal can be suppressed, and the power transmission / data communication can be performed over the facing distance of 0 (non-contact) to 10 mm. In addition, since the power transmission coil and the data communication coil have an integrated structure, the size can be reduced, and the degree of freedom in installation is improved. Furthermore, since transmission is performed in a non-contact manner, high reliability can be maintained.

3 is a block diagram illustrating a configuration example of a contactless transmission apparatus according to Embodiment 1. FIG. It is a figure which shows the structure of the coil structure in Embodiment 1 and Embodiment 2 of this invention. It is a figure which shows the flow of the magnetic flux when the pot core type ferrite core is interposed between the inner coil and the outer coil in the first embodiment and the second embodiment of the present invention. A graph showing the relationship between the opposing distance of the power transmission coil and the coupling coefficient when the inner coil is used as the power transmission coil, and the relationship between the opposing distance of the power transmission coil and the coupling coefficient when the outer coil is used as the power transmission coil. It is a graph to show. It is a graph which shows the relationship between the opposing distance according to size of a coil structure ferrite core, and a coupling coefficient. It is the graph which added the value of the coupling coefficient calculated with respect to the opposing distance of a power transmission coil and a data communication coil at the time of using an outer coil as a power transmission coil, and using an inner coil as a data communication coil. It is a block diagram which shows the structural example of the non-contact transmission apparatus in Embodiment 2 of this invention. It is a figure which shows the example of mounting of the non-contact transmission apparatus which concerns on this invention.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a contactless transmission apparatus including a coil structure according to the present invention.
As shown in FIG. 1, the non-contact transmission device 1 includes a transmission unit 2a and a reception unit 2b.
The transmission unit 2a includes a functional unit 3a, a communication unit 4a, a power supply unit 5a, a switching unit 6a, and a coil structure 7a that houses a primary coil.
The receiving unit 2b includes a functional unit 3b, a communication unit 4b, a power receiving unit 5b, a switching unit 6b, and a coil structure 7b that houses a secondary coil.
Next, the configuration of the transmission unit 2a will be described.
FIG. 2 is a structural diagram showing the configuration of the coil structure 7a or 7b in FIG.
As shown in FIG. 2, the coil structure 7a includes a pot-type ferrite core 71a, an inner coil 72a, and an outer coil 73a. The ferrite core 71a is made of a magnetic material having a cylindrical shape, and has a groove 711a formed concentrically. Further, the inner coil 72a is formed in a hollow cylindrical shape, and is attached so as to be fitted into the groove portion 711a of the ferrite core 71a. The outer coil 73a is formed in a hollow cylindrical shape having the same height as the ferrite core 71a. The outer coil 73a is disposed outside the ferrite core 71a so that the ferrite core 71a is fitted in the hollow portion of the outer coil 73a. It is attached.
The switching unit 6a switches the connection destination of the inner coil 72a and the outer coil 73a to the communication unit 4a and the power supply unit 5a, and uses the inner coil 72a and the outer coil 73a as a power transmission coil and a data communication coil, respectively. The state to be used is switched to the state to be used as the data communication coil and the power transmission coil, or vice versa.
The functional unit 3a generates transmission data and control signals, and includes a CPU and DSP that perform arithmetic processing and control, a storage unit that stores various data, a ROM that stores programs, and the like.
The data communication unit 4a modulates the transmission data sent from the functional unit 3a and transmits it to the receiving unit 2b via the switching unit 6a and the coil structure 7a.
The power supply unit 5a is a power supply that supplies power from the transmission unit 2a to the reception unit 2b.

Next, the configuration of the receiving unit 2b will be described.
As shown in FIG. 2, the coil structure 7b includes a pot-type ferrite core 71b, an inner coil 72b, and an outer coil 73b. The ferrite core 71b is made of a magnetic material having a cylindrical shape, and has a groove 711b concentrically. Further, the inner coil 72b is formed in a hollow cylindrical shape, and is attached so as to fit into the groove portion 711b of the ferrite core 71b. The outer coil 73b is formed in a hollow cylindrical shape having the same height as the ferrite core 71b. The outer coil 73b is disposed outside the ferrite core 71b so that the ferrite core 71b fits into the hollow portion of the outer coil 73b. It is attached.
The switching unit 6b switches the connection destination of the inner coil 72b and the outer coil 73b to the communication unit 4b and the power supply unit 5b, and uses the inner coil 72b and the outer coil 73b as a power transmission coil and a data communication coil, respectively. The state to be used is switched to the state to be used as the data communication coil and the power transmission coil, or vice versa.
The function unit 3b generates a control signal, and includes a CPU and DSP that perform arithmetic processing and control, a storage unit that stores various data, a ROM that stores programs, and the like.
The modulation data sent from the transmission unit 2a is received via the coil structure 7b and the switching unit 6b, and the data communication unit 4b demodulates the received modulation data into baseband data and transmits it to the function unit 3b.
The power reception unit 5b receives the power supplied from the transmission unit 2a and supplies it to each component of the reception unit 2b.
Further, the contactless transmission is performed between the coil structure 7a and the coil structure 7b. When an actual device is assumed, the coil structure 7a which is the primary coil is fixed. Therefore, the coil structure 7b, which is a secondary coil, is attached to the movable part. Therefore, the device including the coil structure 7b rotates with respect to the coil structure 7a on the opposite side with the axis passing through both centers as a rotation center, or is separated or close in the axial direction.

The reason why the switching unit 6 is provided is that depending on the facing distance between the coil structure 7a and the coil structure 7b, the coupling coefficient between the primary side inner coil and the secondary side inner coil and the primary side outer coil This is because the power transmission efficiency changes due to a change in the coupling coefficient of the outer coil on the secondary side, so that stable power transmission cannot be obtained. By providing this switching unit, the facing distance between the coil structure 7a and the coil structure 7b changes. When the distance reaches a predetermined distance, the switching unit switches the connection destination of the inner coil and the connection destination of the outer coil. That is, if the connection destination of the inner coil has been the power supply unit (or power reception unit) and the connection destination of the outer coil has been the communication unit, the switching unit switches the connection destination of the inner coil to the communication unit. Is switched to the power supply unit (or the power receiving unit). If the connection destination of the inner coil has been the communication unit and the connection destination of the outer coil has been the power supply unit (or power reception unit), the switching unit switches the connection destination of the inner coil to the communication unit, and the outer coil Is switched to the power supply unit (or the power receiving unit).
This switching always provides stable power transmission characteristics.

FIG. 4 is a graph showing the relationship between the coupling distance and the opposing distance of the power transmission coil when the inner coil 72 is used as the power transmission coil, and the opposing distance of the power transmission coil when the outer coil 73 is used as the power transmission coil. It is a graph which shows the relationship of a coupling coefficient.
In FIG. 4, a graph with rhombuses attached to the lines is a graph showing the relationship between the facing distance of the power transmission coil and the coupling coefficient when the inner coil 72 is used as the power transmission coil. The graph shown is a graph showing the relationship between the facing distance between the primary coil and the secondary coil of the power transmission coil and the coupling coefficient when the outer coil 73 is used as the power transmission coil. From FIG. 4, when the opposing distance between the coil structure 7a on the transmission side (primary side) and the coil structure 7b on the reception side (secondary side) becomes large, the primary side coil when the inner coil 72 is used as a power transmission coil. Coupling coefficient between the inner coil 72a and the inner coil 72b as the secondary coil, and the outer coil 73a as the primary coil and the outer coil as the secondary coil when the outer coil 73 is used as a power transmission coil It can be seen that the coupling coefficient between 73b decreases. In the proximity distance (0 to Xmm), when the inner coil 72 is used as a power transmission coil (the graph shown with diamonds in the line in the figure), the outer coil 73 is used as a power transmission coil. The coupling coefficient between the primary side coil and the secondary side coil is larger than (a graph shown with a square added to the line in the figure). When the outer coil 73 is used as a power transmission coil when the outer coil 73 is used as a power transmission coil (a graph shown by adding a square to the line in the drawing), the inner coil 72 is used as a power transmission coil. The coupling coefficient of the primary side coil and the secondary side coil is larger than the graph (diamonds attached to the middle line). That is, when the distance between the opposing coil structures is 0 to Xmm, the inner coil 72 is used as a power transmission coil (in this case, the outer coil 73 is used for data communication). Using the coil 73 as a power transmission coil (in this case, the inner coil 72 is used for data communication) enables power transmission with high efficiency.

  When the inner coil 72 is used as a power transmission coil, a graph showing the relationship between the facing distance between the primary coil and the secondary coil and the coupling coefficient and the primary coil and the second coil when the outer coil 73 is used as a power transmission coil. In the graph showing the relationship between the facing distance to the secondary coil and the coupling coefficient, the value of the facing distance X at which the coupling coefficient of the coil is reversed differs depending on the size of the ferrite core 71. FIG. 5 shows a graph of the coupling coefficient change and the facing distance depending on the ferrite core size. The smaller the diameter of the ferrite core, the smaller the coupling coefficient, and the value of X becomes a closer value. This value can be derived from parameters such as the diameter and effective permeability of the ferrite core.

Next, the coupling coefficient with respect to the facing distance between the power transmission coil and the data communication coil when the outer coil 73 was used as the power transmission coil and the inner coil 72 was used as the data communication coil was calculated. FIG. 6 is a graph in which the value of the coupling coefficient calculated with respect to the opposing distance between the power transmission coil and the data communication coil when the outer coil 73 is used as the power transmission coil and the inner coil 72 is used as the data communication coil. is there. The calculated coupling coefficient value is a numerical value of the influence of the power transmission signal on the data communication signal. If the coupling coefficient is small, it can be said that the influence is small.
In FIG. 6, when the value of the coupling coefficient between the power transmission coil and the data communication coil is compared with the value of the coupling coefficient of each of the outer winding and the inner winding, it can be confirmed that the former value is sufficiently smaller than the latter value. Therefore, it can be said that the data communication signal is hardly affected by the power transmission signal.

  Thus, in the coil structure 7a of the transmitter 2a and the coil structure 7b of the receiver 3a, the ferrite core 71 is used and the inner coil 72 and the outer coil 73 are separated as shown in FIG. Thus, the magnetic flux 74 composed of the inner coils 72a and 72b is constrained within a narrow range around the inner coils 72a and 72b by the ferrite core 71 to suppress outward expansion, and is composed of the outer coils 73a and 73b. Since the magnetic flux 75 is restrained by the ferrite core 71 within a narrow range around the outer coils 73a and 73b and restrains the expansion to the inside, it is difficult for the magnetic flux lines to be transmitted to the other side by the ferrite core. Both are less affected by the opponent. Conventionally, the magnetic flux of the power transmission coil and the magnetic flux of the data communication coil affect each other. Therefore, to avoid this effect as much as possible, it is necessary to separate the power transmission coil from the data communication coil to some extent. However, by utilizing the ferrite core 71, it is possible to perform power transmission and data communication as one integrated structure.

Next, specifications of the power transmission / reception coil and the data transmission / reception coil will be described.
In FIG. 1, a litz wire is used for the power transmission coil of the coil structure 7a. The number of turns of the coil at this time is 10 to 30 turns. Similarly, a litz wire is also used for the power receiving coil of the coil structure 7b. The number of turns of the power receiving coil is set to 10 to 30 turns as in the coil structure 7a. The Litz wire or copper wire having 10 to 30 turns is also used for the data transmission coil of the coil structure 7a. The data receiving coil of the coil structure 7b has the same specifications.

  The operation of the contactless transmission apparatus 1 of the present invention will be described with reference to FIG. In the transmission unit 2a, the power source unit 5a receives AC power from the connected functional unit 3a, and supplies AC power having a relatively low frequency to the coil structure 7a via the switching unit 6a, thereby allowing the power source unit 5a to be connected to the outer side of the inner coil 72a. An electromagnetic field is emitted to the space through the coil 73a connected to the power supply unit 5a. In the receiving unit 2b, when the one connected to the power receiving unit 5b of the inner coil 72b and the outer coil 73b receives an electromagnetic field from the transmitting unit 2a through the space, the receiving unit 2b is induced by the electromagnetic field to generate AC power. The AC power is supplied to the power receiving unit 5b via the switching unit 6b. The power receiving unit 5b rectifies the received AC power, converts it into DC power, converts it to a predetermined voltage, and supplies it to each unit including the functional unit 3b and the communication unit 4b of the receiving unit 2b. Thereby, the function part 3b and the communication part 4b operate | move.

  When the function unit 3a of the transmission unit 2a transmits data to the function unit 3b of the reception unit 2b, when the communication unit 4a receives data from the function unit 3a, the communication unit 4a modulates the data to generate a high frequency with a frequency different from the above power. Convert to signal. Then, by supplying a high frequency signal to the coil structure 7a via the switching unit 6a, a frequency different from the above power is supplied to the space via the one connected to the data communication unit 4a of the inner coil 72a and the outer coil 73a. Fire the electromagnetic field. In the receiving unit 2b, when the one connected to the communication unit 4b among the inner coil 72b and the outer coil 73b receives an electromagnetic field from the transmitting unit 2a through the space, the receiving unit 2b is induced by the electromagnetic field to generate an AC signal. When the switching unit 6b receives this AC signal, it is discriminated by the frequency of this signal and sent to the communication unit 4b. When the communication unit 4b receives an AC signal from the coil structure 7b via the switching unit 6b, the communication unit 4b performs demodulation to reproduce the data, and passes the reproduced data to the function unit 3b.

  Similarly, when the functional unit 3b of the receiving unit 2b transmits data to the functional unit 3a of the transmitting unit 2a, when the communication unit 4b receives data from the functional unit 3b, the frequency is different from the above power by modulating the data. To high frequency signal. Then, by supplying a high-frequency signal to the coil structure 7b via the switching unit 6b, a frequency different from the above power is supplied to the space via the one connected to the data communication unit 4b of the inner coil 72a and the outer coil 73a. Fire the electromagnetic field. In the transmission unit 2a, when the one connected to the communication unit 4a among the inner coil 72a and the outer coil 73a receives an electromagnetic field from the reception unit 2b through the space, the transmission unit 2a is induced by the electromagnetic field to generate an AC signal. When the switching unit 6a receives this AC signal, it is discriminated by the frequency of this signal and sent to the communication unit 4a. When the communication unit 4a receives an AC signal from the coil structure 7a via the switching unit 6a, the communication unit 4a performs demodulation to reproduce data, and passes the reproduced data to the function unit 3a.

Regarding the switching operation, as described above, when the outer coil 73 is used as a power transmission coil, the magnitude of the coupling coefficient between the primary side coil and the secondary side coil is larger than the inner coil 72 as the power transmission coil. In this case, since the facing distance that is larger than the coupling coefficient between the primary side coil and the secondary side coil is X mm, when the facing distance between the coil structure 7a and the coil structure 7b changes during power transmission, During the proximity distance (0 to Xmm), the inner coil 72 is used as a power transmission coil (that is, the inner coil 72a is connected to the power supply unit 5a, and the inner coil 72b is connected to the power reception unit 5b). When the distance increases, the switching unit 6 operates and the outer coil 73 is used as a power transmission coil (that is, the outer coil 73a is connected to the power supply unit 5a, Side coil 73b is connected to the power receiving portion 5b).
The switching operation in this case will be described.
Whether the inner coil 72 is used as a power transmission coil or the outer coil 73 is used as a power transmission coil, the function unit 3b monitors the voltage of the power induced in the coil structure 7b, and is below a certain voltage value. In the case of, the switching unit 6b is operated via the communication unit 4b to automatically switch from the inner coil 72b connected to the power receiving unit 5b to the outer coil 73b (or from the outer coil 73b to the inner coil 72b), A switching signal is transmitted to the transmission side 2a. When the functional unit 3a receives the switching signal from the receiving unit 2b, the switching unit 6a is operated via the communication unit 4a to connect from the inner coil 72b to the outer coil 73b (or from the outer coil 73b to the inner coil 72b). To) switch automatically.

  In the above description, the switching means automatically switches according to the operating distance. However, in the non-contact transmission device 1, when the distance between the coil structures 7a and 7b facing each other is fixed in advance. The power transmission coil and the data communication coil may be manually switched using means such as a switch. Further, the switching means may be fixed in advance by soldering at the time of shipment.

  As for the frequency used in the present invention, the frequency band used for power transmission is several tens of kHz, and the frequency of the carrier wave used for data communication uses the MHz band. It supports high-speed communication by shifting power and communication bandwidth.

  As described above, according to the first embodiment, the contactless transmission apparatus includes the transmission unit and the reception unit arranged in contact with the transmission unit, and the transmission unit supplies the power and the transmission data. A functional part, a first inner coil, a first outer coil, and a first magnetic body that is interposed between the first inner coil and the first outer coil and separates both magnetic fields. A first coil structure having an integral structure, a power supply unit that receives power output from the first function unit and outputs power to the first coil structure, and data output from the first function unit The first communication unit that modulates the signal and outputs it to the first coil structure, and either the first inner coil or the first outer coil to the power source unit according to the distance between the transmission unit and the reception unit Connect and connect the other to the first communication unit, or connect the first inner coil and the first outer coil A first switching unit for switching, the receiving unit is configured to operate based on data from the first functional unit, a second functional unit, a second inner coil, and a second outer coil; A second magnetic body that is interposed between the second inner coil and the second outer coil and separates both magnetic fields, and has a single structure, and the second inner coil and the second outer coil A second coil structure in which either one receives power from the transmitter by electromagnetic induction to generate a first current, and the other receives data from the transmitter by electromagnetic induction to generate a second current; In synchronism with the connection switching operation of the first switching unit, the second inner coil and the second outer side are sent so that the first current is sent to the power receiving unit and the second current is sent to the second communication unit. Either one of the coils is connected to the power receiving unit and the other is connected to the second communication unit, or the second A second switching unit that reversely switches the connection destination of the inner coil and the second outer coil, a power receiving unit that extracts power from the first current and supplies it to the second functional unit, and a data signal from the second current And a second data communication unit that demodulates and reproduces data and supplies it to the second functional unit, so that interference between the power supply and the communication signal can be suppressed, and the integrated structure Miniaturization and cost reduction can be achieved. Further, since transmission is performed in a non-contact manner, high reliability can be maintained.

Embodiment 2. FIG.
FIG. 7 is a block diagram showing a configuration example of a contactless transmission apparatus according to Embodiment 2 of the present invention. In FIG. 7, the non-contact transmission apparatus 1 is substantially the same as the configuration shown in FIG. The difference between FIG. 7 and FIG. 1 is that the number of coil structures connected to each of the transmitter 2a and the receiver 2b is two instead of one. Since the non-contact transmission device 1 according to the first embodiment is configured by a set of coil structures, the coil structure 7 of the transmission unit 2a is only the coil structure 7a, and the coil structure 7 of the reception unit 2b. Was only the coil structure 7b. In the non-contact transmission device 1 according to the second embodiment of the present invention, the coil structure 7 is divided into two.

That is, as shown in FIG. 7, the coil structures 7 connected to the transmitter 2a are coil structures 7a and 7c, and the coil structures 7 connected to the receiver 2b are coil structures 7b and 7d. .
When the distance D between the transmitter 2a and the receiver 2b is 0 (non-contact) to Xmm, the coil structure 7a of the transmitter 2a and the coil structure 7b of the receiver 2b operate. When the distance D between the transmitter 2a and the receiver 2b is X mm, the coil structure 7c of the transmitter 2a and the coil structure 7d of the receiver 2b operate. Whether the coil structures 7a and 7b are operated or whether the coil structures 7c and 7d are operated is determined by monitoring the voltage of the electric power induced in the coil structure 7b by the functional unit 3b and not exceeding a certain voltage value. In this case, the switching unit 6b is operated via the communication unit 4b to automatically switch the coil structure 7 to be used from 7b to 7d and transmit a switching signal to the transmission side 2a. When the functional unit 3a receives the switching signal from the receiving unit 2b, the coil structure 7 to be used is automatically switched from 7a to 7c by operating the switching unit 6a via the communication unit 4a.

  In addition, since the transmission unit 2a and the reception unit 2b can perform power transmission and data communication in a non-contact manner, products mounted on the transmission unit 2a or the reception unit 2b can be frequently attached and detached. Therefore, the coil structures 7a and 7b, and 7c and 7d do not necessarily face each other under the specifications and use conditions of the installed model. That is, depending on the case, the coil structures 7a and 7d and 7b and 7c may be arranged to face each other. Even in such a case, as can be confirmed from FIG. 6, the coupling coefficient between the coils is generally low regardless of the facing distance. Therefore, although the opposing distance that can be transmitted is short, both power transmission and data communication are possible in the proximity state without any problem.

  Since the electronic device according to the second embodiment of the present invention is configured as described above, the coil structures 7 are used in the correct orientation, so that the coil structures 7 constantly move in the opposite distance. However, efficient and stable power transmission is possible. In the first embodiment, since the power transmission coil and the data communication coil are switched and used, each coil is a combination that can be used for either power transmission or data communication. In Embodiment 2, since the inner coil and the outer coil are completely separated by interposing a ferrite core, it is possible to select a combination of coils (such as the number of turns) specialized for power transmission. Therefore, the optimum coil structure can be continuously selected according to the distance and can be individually adjusted, so that high efficiency and energy saving can be realized.

Embodiment 3 FIG.
A mounting example of a non-contact transmission device will be described with respect to the third embodiment of the present invention. FIG. 8 is a diagram showing an example of mounting the non-contact transmission device according to the present invention, and FIG. 8 (a) is a perspective view of an induction heating cooker equipped with the non-contact transmission device of the present invention. As shown in FIG. 8A, the operation unit 22 is provided on the front side of the top plate 21 of the induction heating cooker 20, and the non-contact transmission device 1 is used for controlling the operation unit 22. FIG. 8B is a plan view showing the attachment position of the coil structure 7 on the primary side of the non-contact transmission device 1 and shows a state where the top plate 21 is removed. In FIG. 8 (b), a region where the operation unit 22 is attached is indicated by a dotted line portion 23. The operation unit 22 is operated in two places vertically and horizontally on the main body side of the induction heating cooker 20, that is, below the top plate 21. It can be seen that the part 22 can be attached. Further, as shown in FIG. 8B, the primary coil structures 7a, 7b, 7c, and 7d for transmission are attached to almost both ends of the operation unit 22. Although not shown, the primary side functional unit, communication unit, and power source unit are provided on a substrate in the main body. FIG. 8C is a rear view of the operation unit 22 detachably installed on the dotted line portion 23 in FIG. 8B, and the primary side coil on the rear surface of the operation unit 22 as shown in FIG. Secondary coil structures 7e and 7f for reception are attached at positions facing the structures 7a, 7b, 7c and 7d.

  Since the induction heating cooker according to the third embodiment of the present invention is configured as described above, the operation unit can be easily detached or attached, and the top plate 21 can be kept clean by cleaning. Moreover, since the operation direction can be freely changed by moving the operation unit 22 to any of the four vertical and horizontal positions, the user-friendliness in the island kitchen can be improved.

  In the above example, the possible range of the facing distance is set to 0 to 10 mm. However, by increasing the diameter of the coil, the range of 10 mm to 20 mm may be possible.

  As an application example of the non-contact transmission device in the present invention, an input / output device in household electrical appliances and an input / output device in FA devices can be mentioned.

  DESCRIPTION OF SYMBOLS 1 Contactless transmission apparatus, 2a Transmission part, 2b Reception part, 3, 3a, 3b Function part, 4, 4a, 4b Communication part, 5a Power supply part, 5b Power reception part, 6, 6a, 6b Switching part, 7, 7a, 7b, 7c, 7d, 7e, 7f Coil structure, 71, 71a, 71b Ferrite core, 72, 72a, 72b Inner coil, 73, 73a, 73b Outer coil, 74 Inner coil magnetic flux, 75 Outer coil magnetic flux, 20 Induction heating cooker, 21 top plate, 22 operation part, 23 dotted line part, 711a, 711b groove part.

Claims (8)

A transmission unit, and a reception unit arranged in non-contact with the transmission unit,
The transmitter is
A first functional unit for supplying power and data;
A first inner coil, a first outer coil, and a first magnetic body that is interposed between the first inner coil and the first outer coil and separates both magnetic fields from each other, have an integrated structure. A first coil structure comprising:
A second inner coil, a second outer coil, and a second magnetic body that is interposed between the second inner coil and the second outer coil and separates both magnetic fields, are integrated. A second coil structure having
A power supply unit that receives power output from the first functional unit and outputs the power to the first coil structure and the second coil structure;
A first communication unit that modulates transmission data output from the first functional unit and outputs a data signal to the first coil structure and the second coil structure;
Whether one of the first inner coil and the first outer coil is connected to the power supply unit and the other is connected to the first communication unit according to the distance between the transmission unit and the reception unit Or a first switching unit that connects either the second inner coil or the second outer coil to the power supply unit and connects the other to the first communication unit,
The receiver is
A second functional unit that operates based on data from the first functional unit;
A third inner coil, a third outer coil, and a third magnetic body that is interposed between the third inner coil and the third outer coil and separates both magnetic fields from each other are integrated. One of the third inner coil and the third outer coil receives power from the transmitter by electromagnetic induction to generate a first current, and the other from the transmitter by electromagnetic induction. A third coil structure that receives the data signal and generates a second current;
A fourth inner coil, a fourth outer coil, and a fourth magnetic body that is interposed between the fourth inner coil and the fourth outer coil and separates both magnetic fields from each other. One of the fourth inner coil and the fourth outer coil receives electric power from the transmitter by electromagnetic induction to generate a third current, and the other receives electromagnetic power from the transmitter by electromagnetic induction. A fourth coil structure for receiving a data signal and generating a fourth current;
A power receiving unit that extracts power from the first current or the third current and supplies the power to the second function unit;
A second communication unit that extracts a data signal from the second current or the fourth current, demodulates and reproduces the data, and supplies the data to the second function unit;
Synchronously with the connection switching operation of the first switching unit, the third inner coil is configured to send the first current to the power receiving unit and send the second current to the second communication unit. Or the third outer coil is connected to the power receiving unit and the other is connected to the second communication unit, or the third current is sent to the power receiving unit, and the fourth current is In which one of the fourth inner coil and the fourth outer coil is connected to the power receiving unit and the other is connected to the second communication unit so as to be sent to the second communication unit. A non-contact transmission device. The first magnetic body is formed in a columnar shape, has a first groove formed in a concentric shape with which the first inner coil is fitted, and is fitted with the first outer coil at an outer peripheral portion thereof. And
The second magnetic body has a cylindrical shape and has a second groove formed concentrically into which the second inner coil is fitted, and is fitted with the second outer coil at the outer periphery thereof. The contactless transmission apparatus according to claim 1, wherein   The contactless transmission apparatus according to claim 1, wherein the first magnetic body and the second magnetic body are ferrite cores.   The contactless transmission device according to claim 1, wherein the first magnetic body and the second magnetic body are pot-type ferrite cores.   Any one of the first coil structure, the third coil structure, and the fourth coil structure is used in an opposing state, and the second coil structure and the third coil structure are used. The non-contact transmission device according to claim 1, wherein the other of the coil structure and the fourth coil structure is used in a state of being opposed to each other. The second functional unit causes the second switching unit to perform switching when the induced voltage falls below a predetermined value, and transmits a switching signal to the first functional unit,
The non-transitory device according to claim 1, wherein the first functional unit causes the first switching unit to perform switching based on a switching signal from the second functional unit. Contact transmission device. A fixed part and a movable part,
The contactless transmission apparatus according to claim 1, wherein the transmission unit is fixed to the fixed unit, and the reception unit is attached to the movable unit.   An induction heating cooker comprising the non-contact transmission device according to claim 1.

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