JP5608026B2 - Contactless power transmission and communication system - Google Patents

Description

  The present invention relates to contactless power transmission and a communication system that perform data transfer while charging a portable electronic device such as a portable terminal.

  A power receiving device that receives power and a signal transmitted from a power transmitting device in a contactless manner has come to be widely used, and various devices are known in the prior art.

  As this kind of non-contact power transmission and communication system, for example, Patent Document 1 is known. In the non-contact power transmission device disclosed in Patent Document 1, the power transmission winding and the signal transmission winding are wound around one core to reduce the size and cost. FIG. 4 is a configuration diagram of a coil of a conventional non-contact power transmission device. As shown in FIG. 4, a power transmission primary winding 62 and a signal transmission secondary winding 63 incorporated in a housing 61 of a power supply device 60 are wound around one C-type core 64, and the housing of the load device 70 is wound. A power transmission secondary winding 72 and a signal transmission primary winding 73 incorporated in 71 are wound around one C-type core 74.

  Moreover, in patent document 2, the switching part for switching the connection between several antenna coils and the connection between these several antenna coils in series and parallel, and the control means which controls this switching are provided, and several By appropriately switching the connection between the antenna coils, the IC card and the power feeding device that are adjusted so as to obtain the optimum voltage and current can be separated from devices that transmit power using wireless transmission at a longer distance. Even in the case of communication, the communication is possible.

  Furthermore, in Patent Document 3, an interrogator having a transmission circuit that switches and supplies first and second carrier waves having different frequencies to the antenna coil according to power transmission data, and performs signal processing according to instructions from the interrogator and transmits In a data carrier system including a transponder having a signal processing circuit that supplies a signal to a transmission / reception coil, the interrogator switches and supplies a carrier wave, and the transponder obtains power using the carrier wave. .

Japanese Patent Laid-Open No. 10-271713 JP 2004-135455 A Japanese Patent Laid-Open No. 11-88241

  However, the following problems have occurred in the prior art.

  In the non-contact power transmission device described in Patent Document 1, since each transmission coil is used for one common core for power transmission and signal transmission, there is a limit to downsizing, and 1 Since one core is used, a filter circuit for separating signals for signal transmission is required.

  Further, the IC card and the power supply device described in Patent Document 2 have a problem of a complicated configuration of the IC card and a large cost due to an increase in size of the power supply device.

  Furthermore, since the data carrier system described in Patent Document 3 switches the carrier wave with one antenna coil, the frequency divider circuit is placed on the interrogator side, and the data is placed on the carrier wave. A demodulator / modulator circuit was required, and miniaturization was difficult.

  SUMMARY OF THE INVENTION The present invention is directed to a non-contact power transmission and communication system in which transmission signal quality is improved by switching between power transmission and signal transmission at a low cost and in a small size.

  In order to solve the above-described problems, the present invention provides a non-contact power transmission and communication system according to the present invention in which a first coil and a second coil of a power transmission coil and a power receiving coil are used during power transmission and signal transmission. A configuration in which the connection between the first coil and the second coil is switched by the switching unit is used.

That is, according to the present invention, the power transmission apparatus includes a power transmission apparatus having a power transmission coil and a power reception apparatus provided with a power reception coil that is electromagnetically coupled to the power transmission coil. A non-contact power transmission and a communication system for performing non-contact power transmission from the power transmission device to the power reception device and data communication between the power transmission device and the power reception device via electromagnetic coupling with the power reception coil. Each of the power transmission coil and the power reception coil is composed of one coil formed on a substrate, and a first coil part and a second coil part connected to one end part of the first coil part, a first adjustment circuit which is connected to the connection portion of the second coil portion as one end portion of the first coil portion, not connected with the first coil portion before Symbol of the second coil portion second end portion Connect with Composed of a second adjustment circuit comprises an FET, a switching unit for switching the power transmission and the signal transmission by the circuits, by the FET on or off, when the power transmission, the first 2 adjustment circuits are connected to adjust the impedances of the first coil portion and the second coil portion of the power transmission coil and the impedances of the first coil portion and the second coil portion of the power receiving coil, and the signal transmission And the first adjustment circuit is connected to adjust the impedance of the first coil portion of the power transmission coil and the impedance of the first coil portion of the power receiving coil. Transmission and communication systems are obtained.

  In addition, according to the present invention, the contactless power transmission and communication system described above are characterized in that contactless power transmission and communication are started after performing ID authentication by the power transmission coil and the power reception coil.

  In addition, according to the present invention, it is possible to obtain the contactless power transmission and communication system described above, wherein transmission frequencies at the time of power transmission and signal transmission are different.

  In the present application, the first coil and the second coil are used for power transmission, and the first coil is used for signal transmission. However, the first coil is used for power transmission, and the first coil is used for signal transmission. Obviously, even if the configuration is changed according to the transmission, such as the configuration of the coil and the second coil, the same means can be used.

  The non-contact transmission system according to the present invention is a conventional power transmission coil and a power receiving coil main coil used for power transmission and signal transmission by switching the connection between the first coil and the second coil by a switching unit. By constructing a transmission coil suitable for power transmission and signal transmission by saving resources by sharing the first coil for both signal transmission and signal transmission by sharing the coils provided for signal transmission respectively. A non-contact power transmission and communication system in which transmission signal quality is improved by switching between power transmission and signal transmission at low cost and in small size can be obtained.

It is a block diagram of the coil at the time of the electric power transmission which concerns on this invention. It is a block diagram of the coil at the time of signal transmission which concerns on this invention. It is a circuit diagram in the case of comprising a switching part by FET which concerns on this invention. It is a block diagram of the coil of the conventional non-contact electric power transmission apparatus.

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

  The non-contact power transmission and communication system of the present invention comprises a first coil, a second coil, and a second adjustment circuit that adjusts impedance when power is transmitted, and the first coil when signal is transmitted. And a first adjustment circuit that adjusts impedance, and a switching unit that switches between power transmission and signal transmission, and a non-contact power transmission and communication system.

  FIG. 1 is a configuration diagram of a coil during power transmission according to the present invention. FIG. 2 is a configuration diagram of a coil during signal transmission according to the present invention. The power transmission coil and the power reception coil are provided so as to be easily arranged close to each other. In FIGS. 1 and 2, only the coil to be used is represented by hatching.

  The non-contact power transmission and communication system of the present invention includes a power transmission device 1 having a power transmission coil 2 and a power reception device 21 provided with a power reception coil 22 that is electromagnetically coupled to the power transmission coil 2, and the power transmission device 1 and the power reception device 21 are close to each other. By disposing, via the electromagnetic coupling between the power transmission coil 2 and the power reception coil 22, non-contact power transmission from the power transmission device 1 to the power reception device 21 and non-contact signal transmission between the power transmission device 1 and the power reception device 21 are performed. . When the power transmission device 1 and the power reception device 21 are arranged close to each other, the power transmission device 1 recognizes the power reception device 21, and therefore performs ID authentication by data communication, and starts power transmission after the ID authentication is established. Therefore, until ID authentication is established, the power transmission coil 2 and the power reception coil 22 are configured to perform signal transmission, and when ID authentication is established and data communication is completed, the switching units 5 and 25 are switched. Thus, the power transmission coil 2 and the power reception coil 22 are configured to transmit power.

  As shown in FIG. 1, the power transmission device during power transmission connects the power transmission coil 2 to the second adjustment circuit 7 on the substrate 10 of the power transmission device 1 by switching the switching unit 5. Is not connected to the first coil unit 3, the second coil unit 4, and the second adjustment circuit 7, so that it can be configured as one coil. The end portion of the first coil portion 3 that is not connected to the second coil portion 4 is connected to the opposite side of the substrate 10 formed by the power transmission coil 2 by the through hole 9, and is designated by a jumper 8 or the like. Connect to the terminal. The second adjustment circuit is connected on the opposite side of the substrate 10 formed by the power transmission coil 2 by the second coil portion 4 and the through hole 9, connected to the switching portion 5, and then connected to the designated connection terminal. To do.

  Similarly, as shown in FIG. 1, the power receiving device at the time of power transmission connects the power receiving coil 22 to the second adjustment circuit 27 by switching the switching unit 25 on the substrate 30 of the power receiving device 21. By not connecting to the circuit 26, the first coil unit 23, the second coil unit 24, and the second adjustment circuit 27 can be configured as one coil. The end portion of the first coil portion 23 that is not connected to the second coil portion 24 is connected to the opposite side of the substrate 30 formed by the power receiving coil 22 by the through hole 29 and is designated by a jumper 28 or the like. Connect to the terminal. The second adjustment circuit is connected to the opposite side of the substrate 30 formed by the power receiving coil 22 by the second coil portion 24 and the through hole 29, connected to the switching portion 25, and then connected to a designated connection terminal. To do. Although the power transmission coil 2 and the power reception coil 22 of the present application are configured as planar coils that can be easily electromagnetically coupled using the jumpers 8 and 28 and the through holes 9 and 29, the presence or absence of the through holes or the jumpers is not limited.

  As shown in FIG. 2, the power transmission device at the time of signal transmission connects the power transmission coil 2 to the first adjustment circuit 6 on the substrate 10 of the power transmission device 1 by switching the switching unit 5, and the second adjustment circuit 7. By not connecting, the first coil unit 3 and the first adjustment circuit 6 can be configured as one coil. The end portion of the first coil portion 3 that is not connected to the first adjustment circuit 6 is connected to the opposite side of the substrate 10 formed by the power transmission coil 2 by the through hole 9 and is designated by a jumper 8 or the like. Connect to the terminal. The first adjustment circuit 6 is connected to the opposite side of the substrate 10 formed by the power transmission coil 2 by the first coil portion 3 and the through-hole 9, connected to the switching portion 5, and then connected to a designated connection terminal. Connecting.

  Similarly, as shown in FIG. 2, the power receiving device at the time of signal transmission is connected to the first adjustment circuit 26 on the substrate 30 of the power reception device 21 by switching the switching unit 25, and the second adjustment circuit. 27, the first coil unit 23 and the first adjustment circuit 26 can be configured as one coil. The end portion of the first coil portion 23 that is not connected to the first adjustment circuit 26 is connected to the opposite side of the substrate 30 formed by the power transmission coil 22 by the through hole 29 and is designated by a jumper 28 or the like. Connect to the terminal. The first adjustment circuit 26 is connected to the opposite side of the substrate 30 formed by the power receiving coil 22 by the first coil portion 23 and the through hole 29, is connected to the switching portion 25, and then is connected to a designated connection terminal. Connecting. The power transmission coil 2 and the power reception coil 22 of the present application are configured as planar coils that can be easily electromagnetically coupled using the jumpers 8 and 28 and the through holes 9 and 29, but the presence or absence of the through holes or the jumpers is not limited.

  The switching units 5 and 25 are switched by a control program or a circuit, and the configuration of power transmission and signal transmission is switched.

  The frequency at the time of power transmission and the frequency at the time of signal transmission may be different. For example, the frequency at the time of signal transmission is 13.56 MHz, and the frequency at the time of power transmission is driven at a frequency lower than 13.56 MHz, Power transmission can be performed efficiently. This is because, as a general characteristic of the power transistor, when the switching frequency is low, the switching loss due to the operating frequency is reduced.

  The case where the switching part which switches the electric power transmission of the non-contact transmission system of this invention and signal transmission is comprised by the control program is demonstrated.

  In order to describe the switching unit of the power transmission device and the power receiving device, the configuration of the switching unit of the power transmission device during power transmission will be described as an example. The switching unit 5 of the power transmission device 1 illustrated in FIG. 1 is configured by components such as a relay that can switch signals by an external control signal. When ID authentication is first established, the switching unit 5 is switched by switching the switching unit 5 by outputting a switching signal of the power transmission coil 2 during power transmission by a control program such as a microcomputer built in the power transmission device. The coil unit 3, the second coil 4, and the second adjustment circuit 7 are switched. Similarly, the switching unit 25 of the power receiving device 21 is also configured by components such as a relay that can switch signals by an external control signal. When the first ID authentication is established, the switching unit 25 is switched to the power receiving device. A switching program of the power receiving coil 22 at the time of power transmission is output by switching a switching unit 25 by a control program such as a microcomputer built in the first coil unit 23, a second coil unit 24, and a second coil. It switches so that the adjustment circuit 27 may be connected.

  Switching between power transmission and signal transmission is performed by a control program such as a microcomputer in the power transmission device 1 and the power reception device 21 by switching at a predetermined interval or adjusting the switching interval as necessary by signal transmission. .

  A case where an FET is used will be described as an example in which a switching unit that switches between power transmission and signal transmission of the contactless transmission system of the present invention is configured by a circuit. FIG. 3 is a circuit diagram in the case where the switching unit is configured by the FET according to the present invention.

  In order to describe the switching unit of the power transmission device and the power receiving device, the configuration of the switching unit of the power transmission device will be described. As an embodiment in which the switching unit 40 is configured by a circuit, a first selection input terminal 47 to which the first adjustment circuit 6 is connected, a second selection input terminal 48 to which the second adjustment circuit 7 is connected, and a p-type channel FET ( (Hereinafter referred to as “Pch-FET”) 42, n-type channel FET (hereinafter referred to as “Nch-FET”) 41, resistor 44, capacitor 43, diode 45, and magnetic field generated by the coil are detected. A control signal input terminal 46 for inputting a magnetic field sensor output to be selected, and a selection output terminal 49 connected to the selected coil.

  For example, a voltage detected by a sensor having a magnetic field detection function is input to the control signal input terminal 46, half-wave rectified by a diode 45, and smoothed by a resistor 44 and a capacitor 43, Pch-FET 42 and Nch-FET 41. Enter the gate. When the voltage level detected by the magnetic field detection sensor is compared between power transmission and signal transmission, the voltage level is higher during power transmission than during signal transmission. If the threshold value at which the gates of the Pch-FET 42 and the Nch-FET 41 are turned on is set between the voltage level at the time of power transmission and the voltage level at the time of signal transmission, the voltage level smoothed by the resistor 44 and the capacitor 43 is set at the time of power transmission. Therefore, the Nch-FET 41 is turned on, the Pch-FET 42 is turned off, the selection output terminal 49 is connected to the second selection input terminal 48, and the first selection input terminal 47 is open. Become a relationship. At the time of signal transmission, the voltage level smoothed by the resistor 44 and the capacitor 43 is lower than the threshold value for turning on the gate of the FET, so that the Nch-FET 41 is turned off, the Pch-FET 42 is turned on, and the selection output terminal 49 is the first output terminal 49. It is connected to the selection input terminal 47 and is in an open relationship with the second selection input terminal 48.

  Although the configuration of the switching unit 5 of the power transmission device has been described above, the switching unit 25 of the power reception device is similarly controlled.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to these embodiment, Even if there is a design change of the range which does not deviate from the summary of this invention, it is included in this invention. That is, various changes and modifications that can be naturally made by those skilled in the art are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Power transmission apparatus 2 Power transmission coil 3 1st coil part 4 2nd coil part 5 Switching part 6 1st adjustment circuit 7 2nd adjustment circuit 8 Jumper 9 Through hole 10 Board | substrate 21 Power reception apparatus 22 Power reception coil 23 1st Coil unit 24 Second coil unit 25 Switching unit 26 First adjustment circuit 27 Second adjustment circuit 28 Jumper 29 Through hole 30 Substrate 40 Switching unit 41 Nch-FET
42 Pch-FET
43 Capacitor 44 Resistor 45 Diode 46 Control signal input terminal 47 First selection input terminal 48 Second selection input terminal 49 Selection output terminal 60 Power supply 61 Housing 62 Primary winding for power transmission 63 Secondary winding for signal transmission 64 type C Core 70 Load device 71 Housing 72 Secondary winding 73 for power transmission Primary winding 74 for signal transmission C-type core

Claims (3)

A power transmission device having a power transmission coil and a power reception device provided with a power reception coil that is electromagnetically coupled to the power transmission coil, and electromagnetically coupling the power transmission coil and the power reception coil by arranging the power transmission device and the power reception device in proximity to each other A non-contact power transmission from the power transmission device to the power reception device and a non-contact power transmission and communication system for performing data communication between the power transmission device and the power reception device,
Each of the power transmission coil and the power reception coil is formed of a single coil formed on a substrate, and includes a first coil part, a second coil part connected to one end of the first coil part, a first adjustment circuit which is connected to the connection portion of the second coil portion as one end of the first coil portion, and the other end which is not connected to the first coil portion before Symbol of the second coil portion And a connected second adjustment circuit,
It has a FET, a switching unit for switching the power transmission and the signal transmission by the circuits,
By turning the FET on or off,
At the time of the power transmission, the second adjustment circuit is connected, the impedance of the first coil portion and the second coil portion of the power transmission coil, and the impedance of the first coil portion and the second coil portion of the power receiving coil Adjust
In the signal transmission, the first adjustment circuit is connected to adjust the impedance of the first coil portion of the power transmission coil and the impedance of the first coil portion of the power receiving coil. Non-contact power transmission and communication system.   The contactless power transmission and communication system according to claim 1, wherein contactless power transmission and communication are started after performing ID authentication by the power transmission coil and the power reception coil.   The non-contact power transmission and communication system according to claim 1 or 2, wherein transmission frequencies at the time of power transmission and signal transmission are different.

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