WO2017169394A1 - Système de transmission sans fil - Google Patents

Système de transmission sans fil Download PDF

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Publication number
WO2017169394A1
WO2017169394A1 PCT/JP2017/007134 JP2017007134W WO2017169394A1 WO 2017169394 A1 WO2017169394 A1 WO 2017169394A1 JP 2017007134 W JP2017007134 W JP 2017007134W WO 2017169394 A1 WO2017169394 A1 WO 2017169394A1
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WO
WIPO (PCT)
Prior art keywords
signal
circuit
unit
antenna
transmission system
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PCT/JP2017/007134
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English (en)
Japanese (ja)
Inventor
哲也 楠本
齋藤　隆
高岡　彰
善一 古田
Original Assignee
株式会社デンソー
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Publication of WO2017169394A1 publication Critical patent/WO2017169394A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks

Definitions

  • This disclosure relates to a wireless transmission system.
  • Patent Literature 1 discloses a system that includes a power receiving element that receives power transmitted from a power supply apparatus and supplies power corresponding to the received power to a load.
  • the technique described in Patent Document 1 is designed to maintain a sharpness Q, which is the sharpness of resonance with high power, in at least one of the power propagation path to the resonance element of the power feeding device and the power reception power propagation path of the power receiving device.
  • This is a technique that includes a frequency characteristic correction circuit that expands the characteristic to broaden the band.
  • the sharpness Q may be increased to improve the characteristics of the resonator.
  • transmission is increased accordingly.
  • the bandwidth of the frequency at which the characteristics can be regarded as flat becomes narrow. Therefore, the inventor considers a system that can achieve high transmission efficiency by flexibly changing the bandwidth of the frequency at which signals such as power and data are transmitted or received.
  • the bandwidth is fixedly set, and, for example, an operating device for mechanically moving the position of the resonator is required.
  • An object of the present disclosure is to provide a wireless transmission system in which a frequency bandwidth can be flexibly changed.
  • One aspect of the present disclosure provides a wireless transmission system including a transmission device and a reception device.
  • the transmission device includes a signal generation unit and a transmission antenna that transmits a signal generated by the signal generation unit.
  • the receiving device includes a receiving antenna that receives a signal transmitted from the transmitting antenna of the transmitting device, and a signal processing unit that processes a signal received through the receiving antenna.
  • a band limiting circuit is provided in at least one of the signal propagation path from the reception antenna to the signal processing unit of the reception apparatus or the signal propagation path from the transmission antenna to the signal generation unit of the transmission apparatus.
  • the band limiting circuit includes a first capacitor connected in series or in parallel to at least one of the transmission antenna and the reception antenna.
  • the first capacitor unit constitutes a first resonance circuit that resonates in a predetermined frequency band together with the transmission antenna or the reception antenna.
  • the band limiting circuit includes a second resonance circuit that is connected in series to the first resonance circuit, and in which the inductive unit and the second capacitor unit are connected in series or in parallel to resonate in a frequency band that is the same as or close to a predetermined frequency band;
  • An inductive characteristic unit connected between the first resonant circuit and the second resonant circuit and configured such that the inductive characteristic in the operating frequency band is variable. Then, the inductive characteristic unit can change the connectivity between the first resonance circuit and the second resonance circuit.
  • the changing unit changes the inductive characteristic of the inductive characteristic unit of the band limiting circuit, it can change the connectivity between the first resonant circuit and the second resonant circuit, and at the time of signal transmission or signal reception
  • the frequency bandwidth can be changed flexibly.
  • FIG. 1 is a diagram schematically illustrating a wireless transmission system according to the first embodiment.
  • FIG. 2 is a diagram showing a simulation result of frequency characteristics of transmission efficiency according to a change in inductance value.
  • FIG. 3 is a diagram schematically illustrating a wireless transmission system according to the second embodiment.
  • FIG. 4 is a diagram schematically illustrating a wireless transmission system according to the third embodiment.
  • FIG. 5 is a diagram schematically illustrating a wireless transmission system according to the fourth embodiment.
  • FIG. 6 is a diagram schematically illustrating a wireless transmission system according to the fifth embodiment.
  • FIG. 1 is a diagram schematically illustrating a wireless transmission system according to the first embodiment.
  • FIG. 2 is a diagram showing a simulation result of frequency characteristics of transmission efficiency according to a change in inductance value.
  • FIG. 3 is a diagram schematically illustrating a wireless transmission system according to the second embodiment.
  • FIG. 4 is a diagram schematically illustrating a wireless transmission system according to the third embodiment.
  • FIG. 7 is a diagram schematically illustrating a wireless transmission system according to the sixth embodiment.
  • FIG. 8 is a sequence diagram of channel setting processing.
  • FIG. 9 is a diagram schematically illustrating a wireless transmission system according to the seventh embodiment.
  • FIG. 10 is an electrical configuration diagram of the first resonance circuit in the eighth embodiment.
  • FIG. 11 is a first diagram of an electrical configuration of the second resonance circuit in the eighth embodiment.
  • FIG. 12 is part 2 of the electrical configuration diagram of the second resonance circuit in the eighth embodiment.
  • FIG. 13 is a diagram schematically illustrating a wireless transmission system according to the ninth embodiment.
  • FIG. 14 is an explanatory diagram of a substrate mounting example of the receiving device according to the tenth embodiment.
  • the wireless transmission system 101 includes a transmission device 2 and a reception device 3, and the transmission device 2 transmits a signal to the reception device 3 wirelessly.
  • a battery power source serving as a power supply source is connected to the transmission device 2.
  • the transmission device 2 transmits a signal to the reception device 3 wirelessly according to the power of the battery power source.
  • the receiving device 3 operates by using the electric power coupled from the transmitting device 2 by the magnetic field resonance method and transmitted from the transmitting device 2.
  • FIG. 1 mainly shows a characteristic part related to the signal transmission system which is a characteristic of the present embodiment.
  • the transmission device 2 includes a signal generation unit 4 and a transmission antenna 5.
  • the transmission antenna 5 is configured by, for example, a looped conductive wire.
  • the signal generation unit 4 is configured by, for example, a microcomputer, generates a carrier wave signal by a given power supply, for example, modulates the carrier wave signal by a predetermined modulation method, and transmits the data modulation signal to the reception device 3 through the transmission antenna 5. To do.
  • the transmitter 2 generates a large number of carrier signals in the several hundred MHz band as subcarriers, modulates the subcarriers with data using an OFDM (orthogonal frequency-division multiplexing) modulation scheme,
  • the data modulation signal is transmitted as a transmission signal to the reception device 3 through the transmission antenna 5.
  • the receiving device 3 includes a receiving antenna 6, a band limiting circuit 7, and a signal processing unit 8 as a changing unit.
  • the receiving antenna 6 is constituted by, for example, a looped conductive line.
  • the reception antenna 6 is installed in the near field of the transmission antenna 5, and the reception device 3 receives a signal transmitted from the transmission antenna 5 of the transmission device 2 through the reception antenna 6.
  • the receiving device 3 inputs the received signal from the receiving antenna 6 to the signal processing unit 8 through the band limiting circuit 7.
  • the signal processing unit 8 is configured by, for example, a microcomputer and demodulates a data modulation signal received through the receiving antenna 6 and the band limiting circuit 7.
  • the OFDM modulated signal is adjusted so that the aforementioned subcarriers are orthogonal to each other. Therefore, the signal processing unit 8 separates the subcarriers from each other using a fast Fourier transform algorithm, and demodulates the data modulated on the subcarriers.
  • the transmission device 2 can transmit data to the reception device 3.
  • a band limiting circuit 7 is provided between the receiving antenna 6 and the signal processing unit 8.
  • the band limiting circuit 7 is configured by a linear circuit including, for example, variable capacitance diodes (hereinafter abbreviated as diodes) 9 to 11, an inductor 12 as an induction unit, and an inductor 13.
  • the band limiting circuit 7 is a circuit that passes a signal received by the receiving antenna 6 and transmits the signal to the signal processing unit 8.
  • the band limiting circuit 7 passes the transmission signal of the transmission device 2 and has a frequency other than the passing frequency band of the transmission signal. It is composed of a bandpass filter that limits the band.
  • the band limiting circuit 7 is configured by connecting in series between the cathode and anode of the diode 11 and between the anode and cathode of the inductor 12 and the diode 9 between one end of the receiving antenna 6 and the input end of the signal processing unit 8. Yes.
  • the anode of the diode 11 and the inductor 12 are directly connected at the node N1.
  • the capacitance values of the variable capacitance diodes 9 to 11 can be adjusted according to the control of the signal processing unit 8, respectively.
  • the first resonance circuit 14 is configured by the receiving antenna 6 and the diode 11
  • the second resonance circuit 15 is configured by the inductor 12 and the diode 9.
  • An induction characteristic unit 16 is configured between the node N1 and the node N2.
  • the inductive characteristic unit 16 is configured by connecting a diode 10 and an inductor 13 in parallel. This inductive characteristic unit 16 exhibits an inductive characteristic in a band including the frequency of the transmission signal (that is, a used frequency band).
  • the receiving device 3 includes a first resonance circuit 14 that resonates due to the capacitive characteristics of the receiving antenna 6 and the diode 11, and further includes an inductor 12 and a diode 9 connected in series, and the capacitive characteristics of the inductor 12 and the diode 9.
  • the second resonance circuit 15 that resonates is provided.
  • Each element constituting the first and second resonance circuits 14 and 15 is set to a circuit constant having a resonance frequency in a frequency band that is typically the same as the predetermined frequency band or close to the predetermined frequency band within a predetermined range.
  • the resonance frequency can be changed by adjusting the capacitance of the diodes 9 and 11.
  • the predetermined frequency band shown here is the same as or close to the target bandwidth (for example, about 100 MHz) of the band limiting circuit 7.
  • the separation frequency width of the resonance frequencies of the first and second resonance circuits 14 and 15 may be set in accordance with the target bandwidth.
  • the transmission device 2 transmits the data modulation signal to the reception device 3 as a transmission signal. Increasing the data transmission rate requires a wider bandwidth.
  • a first resonance circuit 14 and a second resonance circuit 15 are connected to a signal propagation path between the transmission device 2 and the signal processing unit 8.
  • the sharpness Q of the transmission device 2 viewed from the first resonance circuit 14 is Q1
  • the sharpness Q of the signal processing unit 8 viewed from the second resonance circuit 15 is Q2.
  • the first resonance circuit 14 and the second resonance If the degree of coupling with the circuit 15 is defined as k, k ⁇ SQRT (Q1 ⁇ Q2)> 1 (1) By satisfying the above condition, it can be considered that the bandwidth can be widened.
  • the element values of the components of the band limiting circuit 7, the appropriate distance range between the transmission device 2 and the reception device 3, and the inductances of the transmission antenna 5 and the reception antenna 6 By setting the value or the like, it is possible to increase the bandwidth based on the interaction of each circuit.
  • the transmission apparatus 2 and the reception apparatus 3 perform transmission / reception processing by selecting predetermined one or a plurality of channels from a multi-channel frequency band (for example, several hundred MHz) in a predetermined subcarrier frequency band It is desirable that the frequency bandwidth can be dynamically adjusted using the band limiting circuit 7.
  • the signal transmission efficiency can be improved by increasing the Q value of the frequency band, but if the sharpness Q is increased, the frequency bandwidth tends to become narrower, and conversely, the sharpness Q of the frequency band is lowered. This is because the signal transmission efficiency deteriorates although it is easy to make the frequency bandwidth wide. For this reason, it is desirable to dynamically change the frequency band in order to secure a desired frequency bandwidth, for example, for one channel while increasing the signal transmission efficiency within the frequency band.
  • the band limiting circuit 7 of this embodiment is provided with an inductive characteristic unit 16 in which a diode 10 and an inductor 13 are connected in parallel between nodes N1 and N2.
  • the degree of coupling k in equation (1) is determined according to the capacitance value of these diodes 10 and the inductance value Lm of the inductor 13, and if the inductance value Lm of the inductor 13 is a fixed value, The coupling degree k can be adjusted by changing and controlling the capacitance value.
  • FIG. 2 shows the simulation result of the frequency characteristic of the transmission efficiency according to the change in the inductance value Lm of the inductor 13 when the capacitance value of the diode 10 is a fixed value.
  • the inventor changed the inductive characteristic of the inductive characteristic unit 16 by changing the inductance value Lm of the inductor 13 in the circuit configuration of FIG. 1, and observed the change in the characteristic of the transmission efficiency by simulation.
  • the characteristic shown in FIG. 2 is that the receiving antenna 6 and the inductor 12 have an inductance value of 100 nH, the capacitance values of the diodes 9 and 11 are 5 pF, and the resonance frequencies of the first resonance circuit 14 and the second resonance circuit 15 are the same frequency.
  • the inductance value of the transmission antenna 5 is 20 nH, the coupling coefficient k0 between the transmission antenna 5 and the reception antenna 6 is 0.9, the output impedance Z0 of the signal generation unit 4 is 50 ⁇ , the input impedance Zi of the signal processing unit 8 is 100 ⁇ , Under the conditions, the simulation result is obtained by changing the inductance value Lm of the inductor 13.
  • the frequency band can be made wider by increasing the inductance value Lm of the inductor 13 to, for example, about 60 nH, and the frequency band can be narrowed by reducing the inductance value Lm of the inductor 13 to, for example, about 30 nH. There was found. For this reason, the signal processing unit 8 can adjust the frequency characteristic of the transmission efficiency dynamically by adjusting the inductive characteristic of the inductive characteristic unit 16 in the band limiting circuit 7.
  • the inductive characteristic of the inductive characteristic unit 16 can be adjusted by changing the capacitance value of the diode 10 in the inductive characteristic unit 16, and thereby the frequency characteristic of the transmission efficiency shown in FIG.
  • the bandwidth can be limited similarly to the above.
  • the inductive characteristic unit 16 configured so that the inductive characteristic in the use frequency band can be varied is provided between the first resonant circuit 14 and the second resonant circuit 15. .
  • the degree of coupling k between the first resonance circuit 14 and the second resonance circuit 15 can be changed, and the frequency characteristic of the transmission efficiency can be dynamically changed as shown in FIG.
  • the inductive characteristic unit 16 is preferably configured using the variable capacitance diode 10, and in particular, the inductive characteristic unit 16 may be configured by connecting the inductor 13 and the variable capacitance diode 10 in parallel. At this time, by adjusting the capacitance value of the variable capacitance diode 10 by the signal processing unit 8, the inductance value of the induction characteristic unit 16 in the used frequency band can be easily changed. As a result, the connectivity k between the first resonance circuit 14 and the second resonance circuit 15 can be easily changed.
  • the signal processing unit 8 When the signal processing unit 8 is set so that the connectivity k is high and the sharpness Q is low, the signal processing unit 8 can have a wide band and can have a flat characteristic as much as possible within the band. 8 can adjust the signal transmission efficiency in a frequency selective manner when the connectivity k is set low and the sharpness Q is set high. In particular, even when the band limiting circuit 7 is set to a wide band, it is possible to transmit a signal while increasing the signal transmission efficiency as much as possible. Therefore, it is not necessary to provide an amplifier circuit for amplifying the signal in the subsequent stage. An amplifier circuit may be provided at the subsequent stage of the band limiting circuit 7 in accordance with the required gain.
  • variable capacitance diode 11 is used as the first capacitance section of the first resonance circuit 14, and the variable capacitance diode 9 is used as the second capacitance section of the second resonance circuit 15.
  • the signal processing unit 8 can change the resonance value of the first resonance circuit 14 and the second resonance circuit 15 by changing the capacitance value of the variable capacitance diode 9 or 11, and the frequency characteristic band of the transmission efficiency.
  • the width can be changed flexibly.
  • FIG. 3 shows an additional explanatory diagram of the second embodiment.
  • a wireless transmission system 201 illustrated in FIG. 3 includes a reception device 203, and the reception device 203 includes a band limiting circuit 207.
  • the band limiting circuit 207 includes an induction characteristic unit 216.
  • the induction characteristic unit 216 includes an inductor 13 and an inductor adjustment circuit 220 connected in parallel to the inductor 13.
  • the inductor adjustment circuit 220 includes one or a plurality of inductors 21, 23, 25 and switches 22, 24, 26 connected in series thereto.
  • the inductors 21, 23, and 25 are set to the same or different inductance values, and the switches 22, 24, and 26 can be controlled to be turned on / off from the signal generator 8. 25 can be connected / released between the nodes N1 and N2.
  • the signal generating unit 8 can adjust the combined inductance between the nodes N1 and N2 using the inductive characteristic unit 216, and the same characteristics as in the above-described embodiment can be obtained. As a result, the same effect as the first embodiment can be obtained.
  • FIG. 4 shows an additional explanatory diagram of the third embodiment.
  • the wireless transmission system 301 illustrated in FIG. 4 includes a reception device 303, and the reception device 303 includes a first resonance circuit 314 and a second resonance circuit 315.
  • the first resonance circuit 314 includes the receiving antenna 6 and a capacitor 308.
  • the second resonance circuit 315 includes an inductor 12 and a capacitor 309.
  • Capacitors 309 and 311 are provided in place of the diodes 9 and 11 of the first embodiment, and are configured as fixed capacitors. Although the capacitance values of the capacitors 309 and 311 of this embodiment cannot be changed by the signal processing unit 8, the signal processing unit 8 is configured to be able to change the inductance value of the inductive characteristic unit 16 by the diode 10. The bandwidth of the frequency characteristic can be changed flexibly.
  • FIG. 5 shows an additional explanatory diagram of the fourth embodiment.
  • the wireless transmission system 401 includes a communication device 425 that replaces the transmission device 2 and a communication device 426 that replaces the reception device 3.
  • the communication device 425 includes a signal communication unit 27 and a transmission antenna 5.
  • the signal communication unit 27 has both functions as the signal generation unit 4 and the signal processing unit 8a.
  • the communication device 426 includes a receiving antenna 6, a band limiting circuit 7, and a signal communication unit 28 as a changing unit.
  • the signal communication unit 28 also has both functions as the signal generation unit 4 and the signal processing unit 8.
  • the communication device 425 generates a data modulation signal by a predetermined modulation method by the signal generation unit 4 and transmits the data modulation signal to the communication device 426, and the data modulation signal received from the communication device 426 by the signal processing unit 8a. And a function of acquiring data by demodulating.
  • the signal processing unit 8a does not have a function of changing the capacitance characteristics of the diodes 9 to 11. For this reason, the signal processing unit in the communication device 425 is denoted by reference numeral “8a”.
  • the communication device 426 also generates a data modulation signal with a predetermined modulation method by the signal generation unit 4 and transmits the data modulation signal to the communication device 425.
  • the signal processing unit 8 generates a signal of the communication device 425. And a function of demodulating the data modulation signal received from the unit 4 to acquire data.
  • the signal processing unit 8 of the communication device 426 has a function of changing the capacities of the diodes 9 to 11.
  • the band limiting circuit 7 can change the bandwidth characteristic as shown in FIG. 2 in any case of the transmission / reception processing between the communication devices 425 and 426, and in any case of the transmission / reception processing. Applicable. Therefore, even when data modulated signals are transmitted and received with each other as in the present wireless transmission system 401, the bandwidth of the frequency characteristic of transmission efficiency can be flexibly changed. In addition, the same effects as those of the first embodiment can be obtained.
  • FIG. 6 is an additional explanatory diagram of the fifth embodiment.
  • the wireless transmission system 501 includes a transmission device 502 and a reception device 503.
  • the transmission device 502 includes a matching circuit 29 between the signal generation unit 4 and the transmission antenna 5.
  • the matching circuit 29 is a circuit that matches the impedance mismatch between the output impedance of the signal generation unit 4 and the input impedance of the transmission antenna 5.
  • the receiving device 402 includes a matching circuit 30 between the band limiting circuit 7 and the signal processing unit 8.
  • the matching circuit 30 is a circuit that matches impedance mismatch between the output impedance of the band limiting circuit 7 and the input impedance of the signal processing unit 8. In this case, the signal transmission efficiency can be further improved.
  • the matching circuits 29 and 30 may be provided in any one of the transmission device 502 and the reception device 503.
  • the matching circuits 29 and 30 are at least one of a signal propagation path from the reception antenna 6 to the signal processing unit 8 of the reception device 503 or a signal propagation route from the transmission antenna 5 to the signal generation unit 4 of the transmission device 502. What is necessary is just to provide in either one.
  • (Sixth embodiment) 7 and 8 show additional explanatory views of the sixth embodiment.
  • the configuration examples for changing the bandwidth and the like of the band limiting circuits 7, 207, and 307 have been described.
  • a mode for practically setting a transmission / reception channel using a configuration capable of changing the bandwidth will be described.
  • FIG. 7 shows the system configuration diagram.
  • the wireless transmission system 601 includes communication devices 625 and 626 that function as both a transmission device and a reception device.
  • the communication device 625 includes a signal communication unit 27.
  • the communication device 626 includes a control unit 32 including a signal communication unit 28 and a channel determination circuit 31 as a changing unit.
  • the channel determination circuit 31 is a circuit that determines which channel the signal transmitted from the communication device 625 is, and the signal in the frequency band of any channel among the frequency bands of all channels (for example, CH1 to CH5). Is received.
  • the control unit 32 adjusts the capacities of the diodes 9 to 11 of the respective units 14 to 16 by the signal processing unit 8 of the signal communication unit 28, thereby selectively selecting the frequency band of 1 to all channels among the all channel frequency bands. Adjust the bandwidth. As a result, signals of 1 to all channels including the channel determined by the channel determination circuit 31 can be received.
  • a communication channel assigned in advance includes a total of 5 channels with a 20 MHz bandwidth, and a bandwidth of all 5 channels is 100 MHz.
  • the communication apparatuses 625 and 626 will be described assuming that communication is performed by appropriately selecting a frequency band with less interference waves, and there is no communication channel change arrangement between the communication apparatuses 625 and 626.
  • the signal generation unit 4 of the communication device 625 sets the default transmission channel CH1 in step S1 in the initial setting state.
  • the communication device 626 enters the single channel reception mode in step T1, and switches the bandwidth to the single channel CH1 in step T2.
  • the control unit 32 of the communication device 626 sets the capacitance values of the diodes 9 to 11 so that the bandpass center frequency of the band limiting circuit 7 is matched with the center frequency of the channel CH1 out of the total frequency band 100 MHz of all the channels CH1 to CH5. And the bandwidth of the single channel CH1 is set to 20 MHz. As a result, the channel can be set to CH1.
  • the signal generator 4 of the communication device 625 generates a data modulation signal of the transmission channel CH1 and transmits it to the communication device 626 in step S2.
  • communication device 626 demodulates the data modulated signal by signal processing unit 8 of signal communication unit 28, determines whether or not reception has been completed normally, and has completed reception normally. If it is determined, the signal generator 4 of the signal communication unit 28 generates a data modulation signal of the channel CH1 and transmits an acknowledgment signal to the communication device 625 in step T4.
  • the signal processing unit 8a of the signal communication unit 27 of the communication device 625 can receive and demodulate the data modulation signal of the channel CH1 in step S3 and receive an acknowledgment signal. Thus, the communication device 625 can determine that the channel CH1 can be used.
  • the signal generation unit 4 of the communication device 625 generates a data modulation signal of the transmission channel CH1 in step S4 and transmits the data modulation signal to the communication device 626.
  • the signal processor 8 cannot receive normally and is determined as a reception error in step T5. In this case, since the signal processing unit 8 of the communication device 626 has received some signal but has not completed reception normally, the signal processing unit 8 does not transmit an acknowledgment signal indicating that reception has been completed normally to the communication device 625.
  • the control unit 32 switches to the all-CH reception mode in step T6.
  • the control unit 32 of the communication device 626 adjusts the bandpass center frequency of the band limiting circuit 7 to the center frequency of all frequency bands 100 MHz of all channels CH1 to CH5 and sets the bandwidth of all channels CH1 to CH5 to 100 MHz.
  • the capacitance values of the diodes 9 to 11 are changed.
  • the signal communication unit 27 of the communication device 625 determines that the time is over in step S5 because the signal communication unit 27 of the communication device 625 cannot receive an acknowledgment signal even after a predetermined time has elapsed after transmitting the data modulation signal in step S4. It is determined that some kind of communication failure has occurred. As a result, the signal communication unit 27 of the communication device 625 switches the transmission channel CH1 to, for example, the channel CH3 in step S6. The signal generation unit 4 of the communication device 625 generates a data modulation signal of the transmission channel CH3 in step S7 and transmits the data modulation signal to the communication device 626.
  • the communication device 626 can receive the data modulated signal of the channel CH3 transmitted from the communication device 625.
  • the signal communication unit 28 of the communication device 626 specifies a subcarrier by performing a fast Fourier transform process on the received signal by the signal processing unit 8 and can normally receive data by demodulating the data modulated on the subcarrier. Explore channels. Then, since the signal processing unit 8 of the communication device 626 can normally receive on the channel CH3, the channel determination circuit 31 can determine that the communication device 625 has transmitted the data modulation signal on the channel CH3.
  • the control unit 32 of the communication device 626 sets the band limiting circuit 7 to the center frequency of the channel CH3 in step T10.
  • the capacitance values of the diodes 9 to 11 are set so that the bandpass center frequencies of the first and second bands are matched and the bandwidth of the single channel CH3 is switched to 20 MHz.
  • the signal communication part 28 of the communication apparatus 626 transmits an acknowledgment signal to the communication apparatus 625 by channel CH3 in step T11. Then, the signal processing unit 8a of the communication device 625 can receive this acknowledgment signal on the channel CH3. By using such a flow, communication processing can be established in the channel CH3 in which no disturbing wave is generated, while avoiding communication processing in the channel CH1 in which the disturbing wave is generated. Thereafter, the communication devices 625 and 626 perform normal communication processing on the channel CH3.
  • a method for searching for a communicable channel by sequentially switching the channels CH1 to CH5 on the transmitting side and the receiving side respectively. In this case, the number of trials must be repeated.
  • the control unit 32 controls to change the frequency bandwidth of the band limiting circuit 7 so that the signals of all the plurality of channels CH1 to CH5 can be received, and the channel determination circuit 31 controls the communication device 625. From which channel signal is transmitted. At this time, the communication device 626 can receive by expanding the bandwidth to all the channels CH1 to CH5 using the band limiting circuit 7, so that it is not necessary to search by switching the channels in order as described above.
  • the control unit 32 controls to change the frequency bandwidth of the band limiting circuit 7 to the determined bandwidth of the channel CH3, and the signal communication unit 28 of the communication device 626 switches to the channel CH3 determined by the channel determination circuit 31. By receiving the signal, it is possible to reduce the number of trials and the communication establishment time until communication is established in the channel CH3 where no interference wave is generated.
  • the control unit 32 of the communication device 626 extends the bandwidth of the band limiting circuit 7 to a level exceeding 100 MHz.
  • FIG. 9 shows an additional explanatory diagram of the seventh embodiment.
  • the characteristic part related to the signal transmission system for the transmission device 2 to transmit the data modulation signal to the reception device 3 has been described, but the present invention is also applicable to the case where the main operation power supply power of the reception device 3 is transmitted. it can.
  • FIG. 9 shows a configuration diagram in this case.
  • parts different from the first embodiment will be described.
  • the wireless transmission system 701 includes a power transmission device 702 as a transmission device and a power reception device 703 as a reception device.
  • the power transmission device 702 includes a power signal generation unit 704 and a transmission antenna 5.
  • the power signal generation unit 704 generates AC power in a predetermined frequency band and supplies power to the power receiving device 703 through the transmission antenna 5.
  • the transmission antenna 5 functions as a power transmission antenna.
  • the power receiving device 703 includes a receiving antenna 6, a band limiting circuit 7, a rectifier circuit 33, and a power signal processing unit 708 as a changing unit.
  • the power receiving device 703 includes a rectifier circuit 33 between the band limiting circuit 7 and the signal processing unit 8.
  • the reception antenna 6 receives the AC power generated by the power signal generation unit 704 through the transmission antenna 5, and the band limiting circuit 7 removes the noise superimposed on the received power and outputs it to the rectifier circuit 33.
  • the rectifier circuit 33 outputs the power obtained by rectifying and smoothing the received power to the power signal processing unit 708, and the power signal processing unit 708 supplies this power to the inside of the power receiving device 703.
  • the receiving antenna 6 functions as a power receiving antenna.
  • the power signal processing unit 708 can adjust the capacitance values of the diodes 9 to 11 of the band limiting circuit 7. Therefore, the power signal processing unit 708 can limit the passband width of the AC signal by adjusting the capacitance values of the diodes 9 to 11 of the band limiting circuit 7. In this way, the present invention can also be applied to power transmission. Note that the configuration of the present embodiment can be applied by combining the configurations of the data modulation signals of the first to sixth and eighth to tenth embodiments, for example.
  • FIG. 10 shows additional explanatory views of the eighth embodiment.
  • a modification of the first resonance circuit 14 and the second resonance circuit 15 is shown.
  • the reception antenna 6 and the diode 11 may be connected in parallel between the nodes N1 and N2.
  • the inductor 12 and the variable capacitance diode 9 may be connected in series between the nodes N1 and N2.
  • the diode 9 and the inductor 12 may be connected in parallel between the node N1 and the signal processing unit 8. .
  • the bandpass center frequency or / and the bandwidth of the band limiting circuit 7 can be adjusted in the same manner as in the previous embodiment.
  • the previous embodiment for example, the first embodiment
  • the previous embodiment can be adjusted.
  • similar effects can be obtained.
  • FIG. 13 is an additional explanatory diagram of the eighth embodiment.
  • This embodiment shows a form in which a band limiting circuit 907 is provided in the transmission apparatus 902.
  • the wireless transmission system 901 includes a transmission device 902 and a reception device 903.
  • the transmission device 902 includes a signal generation unit 904, a band limiting circuit 907, and the transmission antenna 5.
  • the receiving device 903 includes a signal processing unit 908 and a receiving antenna 6.
  • the signal processing unit 908 has the same function as the signal processing unit 8 except that the signal processing unit 908 does not include control processing of the capacitance values of the diodes 9 to 11.
  • the transmission device 902 includes a band limiting circuit 907 between the signal generation unit 904 and the transmission antenna 5.
  • the signal generation unit 904 has the same function as the signal generation unit 4, and outputs a data modulation signal to the band limiting circuit 907.
  • the band limiting circuit 907 is configured by a linear circuit including diodes 9 to 11 and inductors 12 and 13, for example.
  • the band limiting circuit 907 is a circuit that passes the data modulation signal generated by the signal generation unit 4 and transmits the data modulation signal to the transmission antenna 5. It is comprised by the band pass filter which restrict
  • the band limiting circuit 907 is configured by connecting in series between the cathode and anode of the diode 9 and between the anode and cathode of the inductor 12 and the diode 11 between the output end of the signal generation unit 904 and one end of the transmission antenna 5. Yes.
  • the inductor 12 and the anode of the diode 11 are directly connected at the node N1.
  • the capacitance values of the diodes 9 to 11 can be adjusted by the signal processing unit 8, respectively.
  • the first resonance circuit 914 is configured by the transmission antenna 5 and the diode 11
  • the second resonance circuit 915 is configured by the inductor 12 and the diode 9.
  • the signal generator 904 and the other end of the transmission antenna 5 are directly connected at the node N2.
  • An induction characteristic unit 916 is configured between the node N1 and the node N2.
  • An inductive characteristic unit 916 is configured by connecting the diode 10 and the inductor 13 in parallel. This inductive characteristic unit 916 exhibits inductive characteristics within the above-described frequency band (that is, the used frequency region).
  • the transmission device 902 includes a first resonance circuit 914 that resonates due to the capacitive characteristics of the transmission antenna 5 and the diode 11, and further includes an inductor 12 and a diode 9 connected in series, and the inductor 12 and the diode 9.
  • a second resonance circuit 915 is provided that resonates due to capacitive. Note that each element constituting the first resonance circuit 914 and the second resonance circuit 915 is normally set to a circuit constant having a resonance frequency in the same predetermined frequency band, and the capacitance of the diodes 9 and 11 is set. By adjusting, the resonance frequency can be changed.
  • the band limiting circuits 7 and 907 are provided on the transmission side or the reception side.
  • the signal generation unit 904 can change the capacitance values of the diodes 9 to 11, the frequency bandwidth can be easily changed, and the center frequency can also be changed. For this reason, the unnecessary radiation based on an unnecessary signal among the signals generated by the signal generator 4 can be reduced.
  • the band limiting circuit 907 is included in the transmitting apparatus 902.
  • a signal propagation path from the transmission antenna 5 to the signal generation unit 904 may be provided. That is, the band limiting circuits 7 and 907 may be provided on at least one of the transmission side and the reception side.
  • FIG. 14 is an additional explanatory diagram of the tenth embodiment. This embodiment shows the installation method of the receiver 3.
  • FIG. 14 shows an example of mounting the receiving device 3.
  • the receiving device 3 includes a receiving antenna 6, a band limiting circuit 7, and a signal processing unit 8.
  • the receiving antenna 6, the band limiting circuit 7 and the signal processing unit 8 are mounted on one flat printed wiring board 34.
  • the receiving antenna 6 of the present embodiment is configured by a pattern antenna in which a looped wiring pattern is formed on the wiring surface of the printed wiring board 34.
  • the first resonance circuit 14 is configured by the diode 11 and the reception antenna 6 and communication processing can be performed by the magnetic field resonance method, it is not necessary to configure a resonance antenna that resonates at the frequency of the transmission signal.
  • the receiving antenna 6 can be configured with a wiring pattern, and the receiving antenna 6 can be configured with a reduced size.
  • the band limiting circuit 7 includes diodes 9 to 11 and inductors 12 and 13 formed of discrete components or an integrated circuit, and the signal processing unit 8 includes an integrated circuit such as a microcomputer. Therefore, the receiving antenna 6, the band limiting circuit 7 and the signal processing unit 8 can be mounted compactly on a single printed wiring board 34.
  • the mounting example of the receiving device 3 described in the first embodiment is illustrated, but the same applies to the receiving devices 203, 303, 403, 503, 603, and 703 of the second to seventh embodiments.
  • the first resonance circuit 14 and the second resonance circuit 15 may be replaced with the first resonance circuit 814 and the second resonance circuits 815a and 815b, respectively.
  • the signal generation unit 4, the band limiting circuit 907, and the transmission antenna 5 of the transmission device 902 may be mounted on the printed wiring board 34. At this time, the transmission antenna 5 can be configured by forming a loop-shaped wiring pattern on the conductive surface of the printed wiring board 34.
  • the present invention is not limited to the above-described embodiment, and for example, the following modifications or expansions are possible.
  • the first resonant circuit 314 and the second resonant circuit 315 are each provided with fixed capacitance capacitors 311 and 309.
  • one of these fixed capacitance capacitors 311 and 309 is replaced with a variable capacitance capacitor ( For example, a variable capacitance diode) may be used instead.
  • the transmission antenna 5 is configured by using a loop-shaped coil
  • a configuration in which a core wire at the tip of a twisted pair cable in which a pair of power transmission lines are twisted together by a twisted portion may be configured. Any configuration may be used as long as a signal can be transmitted to the receiving device 3.
  • the receiving antenna 6 may have a linear configuration instead of a loop shape, and if the signal can be received from the transmission device 2, Any configuration may be used.
  • the variable capacitance diode 10 is shown as being connected in parallel to the inductor 13, it may be connected in series to the inductor 13.
  • the inductive characteristic units 16 and 916 include the single inductor 13 and the variable capacitance diode 10 connected in parallel to the inductor 13, a plurality of inductors 13 may be connected in series or / and in parallel.
  • the variable capacitance diode 10 may be connected in series to the one or more inductors 13.
  • the transmission device 2 and the reception device 3 are coupled to each other by the magnetic field resonance method between the transmission antenna 5 and the reception antenna 6, the method is limited to the magnetic field resonance method as long as the electromagnetic coupling method is used. is not.
  • the band limiting circuit 7 is provided between the reception antenna 6 and the signal processing unit 8.
  • the signal generation unit 4 and the transmission antenna are provided.
  • 5 may be provided with a band limiting circuit 7.
  • 101, 201, 301, 401, 501, 601 and 701 are wireless transmission systems
  • 2, 425 and 502 are transmission devices
  • 625 is a communication device (transmission device)
  • 702 is a power transmission device (transmission device)
  • 3, 203, 303, 426, and 503 are receiving devices
  • 626 is a communication device (receiving device)
  • 703 is a power receiving device (receiving device)
  • 4 904 is a signal generation unit (904 is a changing unit)
  • 704 is a power signal generation.
  • , 5 is a transmitting antenna
  • 6 is a receiving antenna
  • 7, 207 and 307 are band limiting circuits
  • 8 and 8a are signal processing units (8 is a changing unit)
  • 708 is a power signal processing unit (signal processing unit and changing unit).
  • 9 is a variable capacitance diode (second capacitance portion)
  • 309 is a fixed capacitance capacitor (second capacitance portion)
  • 10 is a variable capacitance diode
  • 11 is a variable capacitance diode (first capacitance portion)
  • 311 is a fixed capacitance.
  • Capacitor (first capacitor), 12 an inductor (inductor), 13 an inductor, 14, 814 a first resonance circuit, 15, 815a, 815b a second resonance circuit, 16, 216, 916 an induction characteristic unit, 27 denotes a signal communication unit (signal generation unit) of the transmission device, 28 denotes a signal communication unit (signal processing unit, change unit) of the reception device, 32 denotes a control unit (change unit), and 33 denotes a rectifier circuit.
  • each of the embodiments described above is conceptual, and the functions of one component are distributed to a plurality of components, or the functions of a plurality of components are integrated into one component. May be.
  • at least a part of the configuration of the above-described embodiment may be replaced with a known configuration having a similar function.
  • some or all of the configurations of the two or more embodiments described above may be added in combination with each other or replaced as necessary. Note that the reference numerals in parentheses described in the claims indicate an example of a correspondence relationship with the specific means described in the embodiment described above as one aspect of the present invention, and are technical terms of the present invention. It does not limit the range.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)
  • Details Of Aerials (AREA)
  • Transceivers (AREA)

Abstract

La présente invention concerne un système de transmission sans fil dans lequel un circuit de limitation de bande (7 ; 207 ; 307 ; 907) est équipé d'une première unité de capacité (11 ; 311) branchée en série ou en parallèle à une antenne d'émission (5) et/ou une antenne de réception (6), et est équipé d'un premier circuit de résonance (14 ; 314 ; 814 ; 914) qui résonne dans une bande de fréquences prescrite avec l'antenne d'émission ou l'antenne de réception. Le circuit de limitation de bande est équipé d'un deuxième circuit de résonance (15 ; 315 ; 815a ; 815b ; 915) qui est formé par branchement en série ou en parallèle avec une deuxième unité de capacité (9 ; 309) et une unité d'inductance (12) branchée en série avec le premier circuit de résonance, et qui résonne dans une bande de fréquences identique ou proche de la bande de fréquences prescrite. Une unité caractéristique d'inductance (16 ; 216 ; 916) est reliée entre le premier circuit de résonance et le deuxième circuit de résonance et elle est configurée de telle sorte que la caractéristique d'inductance de la bande de fréquences utilisée peut être modifiée. Une unité de changement (8 ; 28 ; 32 ; 708 ; 904) modifie la caractéristique d'inductance de l'unité caractéristique d'inductance du circuit de limitation de bande.
PCT/JP2017/007134 2016-03-31 2017-02-24 Système de transmission sans fil WO2017169394A1 (fr)

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JP2016-071659 2016-03-31
JP2016071659A JP6564340B2 (ja) 2016-03-31 2016-03-31 無線伝送システム

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WO2017169394A1 true WO2017169394A1 (fr) 2017-10-05

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Publication number Priority date Publication date Assignee Title
JP7043007B2 (ja) * 2018-10-11 2022-03-29 豊田合成株式会社 送電装置、受電装置、および無線給電システム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011130083A (ja) * 2009-12-16 2011-06-30 Mitsubishi Electric Corp 可変フィルタ
WO2014130334A1 (fr) * 2013-02-25 2014-08-28 Qualcomm Incorporated Réseau de transformation d'impédance améliorant la performance d'un circuit d'attaque
WO2014174785A1 (fr) * 2013-04-22 2014-10-30 パナソニックＩｐマネジメント株式会社 Dispositif de transfert de puissance sans fil
WO2015140917A1 (fr) * 2014-03-18 2015-09-24 三菱電機エンジニアリング株式会社 Appareil de transmission de puissance par résonance, dispositif de transmission de puissance côté transmission et appareil de transmission de puissance côté réception

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011130083A (ja) * 2009-12-16 2011-06-30 Mitsubishi Electric Corp 可変フィルタ
WO2014130334A1 (fr) * 2013-02-25 2014-08-28 Qualcomm Incorporated Réseau de transformation d'impédance améliorant la performance d'un circuit d'attaque
WO2014174785A1 (fr) * 2013-04-22 2014-10-30 パナソニックＩｐマネジメント株式会社 Dispositif de transfert de puissance sans fil
WO2015140917A1 (fr) * 2014-03-18 2015-09-24 三菱電機エンジニアリング株式会社 Appareil de transmission de puissance par résonance, dispositif de transmission de puissance côté transmission et appareil de transmission de puissance côté réception

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