JP2014061831A - Ground communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide ground communication equipment capable of efficiently receiving an electric power wave sent from moving onboard communication equipment.SOLUTION: Included are an electric power wave receiving unit that receives an electric power wave, a driving voltage production unit that produces a driving voltage from the electric power wave received by the electric power receiving unit, a voltage regulation unit that includes a resistive component which works on the driving voltage produced by the driving voltage production unit, an action voltage production unit that produces an action voltage from the driving voltage outputted from the voltage regulation unit, a signal wave production unit that produces a signal wave using the action voltage, which is produced by the action voltage production unit, as an electric power source, and a signal wave radiation unit that radiates the signal wave produced by the signal wave production unit. When the driving voltage inputted to the voltage regulation unit gets higher, the resistive component of the voltage regulation unit gives a larger resistance.

Description

  The present invention relates to a ground communication device.

  As background art of this technical field, there is JP-A-8-183454 (Patent Document 1). In this publication, “present information and transmission information for each direction condition are set in the ground element 7. The signal controller sends the control condition of the transmission information indicating the present information and the direction condition to the ground element 7. The ground unit 7 selects the transmission information set by driving the relay circuit according to the transmitted control conditions, and the train is traveling while constantly transmitting the ground unit driving power wave from the vehicle top unit. When 1 approaches the ground unit 7, the transmission unit 13 of the ground unit 7 receives the ground unit driving power wave transmitted by the approaching train, and transmits the transmission information selected by using the received power wave as the power input. It is converted to a transmission message and sent to the train. "

  Moreover, there exists Unexamined-Japanese-Patent No. 2010-130800 (patent document 2) as background art of the technical field which transmits electric power non-contact. This publication describes, as a problem, “widening the range of distance that allows good power transmission while minimizing a decrease in power transmission efficiency”. As a means for solving the problem, “a signal that generates an AC signal S1”. Supply to the battery 4 based on the induction unit V, the power transmission device 2 having the transmission antenna 12 that receives the supply of the AC signal S1 to generate the electromagnetic field, the reception antenna 21 that generates the induction voltage V1 by the electromagnetic field, and the induction voltage V1. The power transmission device 2 includes a rectifying unit 23 that generates a voltage Vo to be transmitted. The power transmission device 2 includes a first matching unit 13 and a first matching unit disposed between the signal generation unit 11 and the transmission antenna 12. 13 includes a first processing unit 15 that performs a first process of matching the signal generation unit 11 and the transmission antenna 12 with each other, and the power receiving device 3 includes a reception antenna 21, a rectification unit 23, The second matching unit 22 disposed between the second matching unit 22 and the second processing unit 25 that controls the second matching unit 22 to perform the second process of matching the receiving antenna 21 and the rectifying unit 23 are provided. " It is described.

JP-A-8-183454 JP 2010-130800 A

  In order to increase the efficiency of power transmission, it is conceivable to apply the conventional technique described in Patent Document 2 to a ground communication device. However, since the on-board communication device passes through the overhead of the ground communication device at high speed, the impedance of the reception antenna of the ground communication device is analyzed and the procedure of matching the reception antenna and the rectifying unit is taken. The time for transmitting the signal wave to the on-board communication device is under pressure.

  It is also conceivable that the distance between the transmitting antenna of the on-board communication device and the receiving antenna of the ground communication device is constant (for example, 200 mm) so that the impedance of each antenna does not fluctuate. In addition, it is difficult to keep the distance between the two antennas strictly constant due to an error in the mounting position of the antennas.

  An object of the present invention is to provide a ground communication device capable of efficiently receiving a power wave from a moving on-vehicle communication device in consideration of such a problem.

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

  The present application includes a plurality of means for solving the above-described problems. For example, a power wave receiving unit that receives a power wave, and a drive voltage is generated from the power wave received by the power wave receiving unit. A driving voltage generating unit; a voltage adjusting unit having a resistance component with respect to the driving voltage generated by the driving voltage generating unit; an operating voltage generating unit generating an operating voltage from the driving voltage output by the voltage adjusting unit; Using the operating voltage generated by the operating voltage generation unit as a power source, a signal wave generation unit that generates a signal wave, and a signal wave emission unit that radiates the signal wave generated by the signal wave generation unit, When the driving voltage input to the voltage adjustment unit is increased, the resistance component of the voltage adjustment unit is increased.

  According to the present invention, it is possible to provide a ground communication device that can efficiently receive a power wave from a moving on-vehicle communication device.

1 is a block diagram of a ground communication apparatus according to Embodiment 1. FIG. 1 is a circuit diagram of a ground communication apparatus according to Embodiment 1. FIG. It is another example of the circuit diagram of the ground communication apparatus which concerns on Example 1. FIG. It is another example of the circuit diagram of the ground communication apparatus which concerns on Example 1. FIG. It is a figure which shows the relationship between the received power wave and generated voltage of the ground communication apparatus which concerns on Example 1. FIG. It is a block diagram of the ground communication apparatus which concerns on Example 2. FIG. It is a block diagram of the ground communication apparatus which concerns on Example 3. FIG. It is a block diagram of the ground communication apparatus which concerns on Example 4. FIG. FIG. 10 is a block diagram of a ground communication apparatus according to a fifth embodiment. It is another example of the block diagram of the ground communication apparatus which concerns on Example 5. FIG. It is a block diagram of the mobile body control system which concerns on each Example.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In this embodiment, an example in which the present invention is applied to a mobile control system will be described.

  FIG. 11 is a configuration diagram of the mobile control system 1 according to the present embodiment. The moving body control system 1 includes a ground communication device 10 installed on a route along which the vehicle body 2 travels, and an on-vehicle communication device 11 and an on-vehicle device 12 attached to the vehicle body 2. The ground communication device 10 transmits information such as its installation position to the on-vehicle communication device 11 as a signal wave. The on-board communication device 11 transmits the information received from the ground communication device 10 to the on-board device 12, and the on-board device 12 performs traveling control of the vehicle body 2 based on the information.

  The ground communication device 10 is a power receiving device that does not have a power supply and operates by receiving a power wave transmitted from the on-vehicle communication device 11. Since the on-board communication device 11 moves at a high speed, the ground communication device 10 needs to quickly generate a signal wave and transmit the signal wave to the on-board communication device 11 while the vehicle body 2 travels overhead.

  FIG. 1 is a block diagram of the ground communication device 10. The ground communication device 10 includes a reception antenna 100, a power distribution unit 101, a power wave rectification unit 102, a control rectification unit 103, a voltage control unit 104, an operating voltage generation unit 105, a signal wave generation amplification unit 106, a matching unit 107, and a transmission. An antenna 108 is provided. The signal wave generation and amplification unit 106 includes a message storage unit 109, a control unit 110, a modulation unit 111, and a signal wave amplification unit 112.

  The receiving antenna 100 is configured by a loop antenna or the like, and receives a power wave transmitted from the on-vehicle communication device 11. In order to improve the efficiency of power transmission, it is desirable that the receiving antenna 100 be matched with, for example, the power distribution unit 101 and the power wave rectification unit 102 in the subsequent stage. The receiving antenna 100 is an example of a power wave receiving unit.

  The power distribution unit 101 outputs 20% of the power wave received by the receiving antenna 100 to the control rectification unit 103 and outputs all remaining power waves to the power wave rectification unit 102. The control rectification unit 103 rectifies the power wave distributed by the power distribution unit 101, generates a voltage, and outputs the voltage to the voltage control unit 104 (hereinafter, this voltage is referred to as “control voltage”). The control voltage is limited to, for example, a rated voltage of a subsequent circuit by a voltage limiting element (described later). The power wave rectification unit 102 also rectifies the power wave distributed by the power distribution unit 101, generates a voltage, and outputs the voltage to the voltage control unit 104 (hereinafter, this voltage is referred to as “drive voltage”). The power wave rectification unit 102 is an example of a drive voltage generation unit, and the control rectification unit is an example of a 103 control voltage generation unit.

  The voltage control unit 104 has a voltage limiting element, compares the control voltage with a predetermined voltage (hereinafter referred to as “reference voltage”), and limits the control voltage below the reference voltage when the control voltage exceeds the reference voltage. To do. When the control voltage is lower than the reference voltage, the control voltage is output as it is. For example, the maximum rated voltage of the operating voltage generation unit 105 is applied as the reference voltage here. Further, the voltage control unit 104 compares the drive voltage with the control voltage, and outputs the drive voltage to the operation voltage generation unit 105 at the subsequent stage only when the potential difference exceeds the threshold value and the drive voltage is lower than the control voltage. Thereafter, when the drive voltage rises and approaches the control voltage, the voltage control unit 104 increases the resistance component and adjusts the drive voltage. Further, when the potential difference between the drive voltage and the control voltage falls below the threshold value, or the drive voltage exceeds the control voltage, the voltage control unit 104 drives the drive voltage (in other words, the operation voltage generation unit 105). Power) output is stopped.

  The operating voltage generation unit 105 is configured by a regulator or the like. When the driving voltage output from the voltage control unit 104 (in other words, current based on the driving voltage) is input, the operating voltage generation unit 105 generates a constant voltage and generates a signal wave generation amplification unit. 106 (hereinafter, this voltage is referred to as “operating voltage”).

  The signal wave generation / amplification unit 106 operates using an operating voltage as a power source (operation source), and generates a signal wave having predetermined information.

  Specifically, digital information pre-recorded in a message storage unit 109 constituted by a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) or a flash memory is converted into PLD (Programmable Logic Device) or Asic ( The control unit 110 configured by Application Specific Integrated Circuit) reads out. The modulation unit 111 modulates the digital information based on a modulation scheme such as FSK (Frequency-shift Keying) to generate an analog signal wave, and the signal wave amplification unit 112 configured by an amplifier or the like Amplify. The signal wave generation / amplification unit 106 is an example of a signal wave generation unit.

  In addition, although the message | telegram memory | storage part 109, the control part 110, and the modulation | alteration part 111 were each comprised independently, you may make it implement | achieve each function collectively by one element, such as PLD. In this case, the entire signal wave generation and amplification unit 106 may save power.

  The signal wave generated by the signal wave generating / amplifying unit 106 is matched in frequency by the matching unit 107 and radiated to the outside by the transmission antenna 108, thereby being transmitted to the on-board communication device 11. The transmission antenna 108 is an example of a signal wave radiating unit.

  The on-board communication device 11 transmits a power wave to the ground communication device 10 (so-called power transmission device) and receives a signal wave transmitted from the ground communication device 10. In order to achieve these functions, the on-board communication device 11 includes a power supply, a transmission antenna including a loop antenna, a reception antenna that receives a signal wave, a demodulation circuit that demodulates the received signal wave, and acquired digital information. A communication circuit for transmitting to the on-vehicle device 12 and a control circuit for controlling them are provided.

  FIG. 2 is a circuit diagram of the power distribution unit 101, the power wave rectification unit 102, the control rectification unit 103, and the voltage control unit 104.

  The power distribution unit 101 includes capacitors 101a to 101e. The power wave received by the receiving antenna 100 is distributed in proportion to the capacitance values of the capacitors 101a to 101e. In the present embodiment, the capacitance values of the capacitors 101a to 101e are the same, and the power wave is evenly distributed. Note that the capacitor 101a is also an element constituting the control rectification unit 103 in the subsequent stage, and is also used when generating a control voltage. By sharing such a capacitor, the number of parts can be reduced.

  The electric charge stored in the capacitor 101 a, that is, a part of the power wave received by the receiving antenna 100 is output to the control rectifier 103. The control rectifier 103 includes a voltage doubler rectifier circuit, and generates a control voltage that rises faster than the drive voltage. Not only the voltage doubler rectifier circuit but also a voltage tripler rectifier circuit or other rectifier circuit may be applied. However, a cockcroft type circuit whose voltage rise is fast so that the voltage control unit 104 in the subsequent stage is immediately turned on. It is desirable to apply. Thereby, speeding up of starting of the ground communication apparatus 10 is realizable.

  Further, most of the electric charge stored in the capacitors 101 b to 101 e, that is, the most of the electric wave received by the receiving antenna 100 is output to the electric wave rectifying unit 102. The power wave rectification unit 102 is configured by arranging bridge diodes 102a to 102b in parallel, and generates a DC drive voltage. Various configurations can be applied to the rectifier circuit of the power wave rectifier 102. However, when the bridge diodes 102a to 102b are arranged in parallel, the rectification efficiency can be improved and the withstand voltage performance can be ensured. it can.

  As shown in FIG. 3, the power wave rectifying unit 102 may be configured by a series arrangement circuit of bridge diodes 102 a to 102 b in order to improve the breakdown voltage performance. Further, as shown in FIG. 4, a parallel arrangement circuit of two diode series bridges may be applied. Furthermore, a power wave rectification unit destruction prevention circuit 500 formed of a Zener diode may be inserted immediately after the power wave rectification unit 102. In this case, the Zener voltage of the Zener diode applied to the power wave rectifier destruction prevention circuit 500 is set to be larger than the maximum value that can be taken by the reference voltage so as not to affect the operation of the voltage control unit 104 in the subsequent stage. Is preferred.

  The drive voltage and the control voltage obtained by the power wave rectification unit 102 and the control rectification unit 103 are input to the voltage control unit 104 configured by the field effect transistor 104a and the Zener diode 104b.

  The field effect transistor 104 a is arranged so that the drain terminal is connected to the power wave rectifying unit 102 side, the source terminal is connected to the operation voltage generating unit 105 side in the subsequent stage, and the gate terminal is connected to the control rectifying unit 103. When the potential difference between the drive voltage (including a voltage drop due to a field effect transistor or the like) serving as the source voltage and the control voltage serving as the gate voltage is equal to or lower than the threshold voltage of the field effect transistor 104a, the current between the drain and source is Although the current does not flow, when the potential difference between the drive voltage and the control voltage exceeds the threshold voltage of the field effect transistor 104a, the drain-source becomes conductive, and the drive voltage from the voltage control unit 104 is changed to the operation voltage generation unit at the subsequent stage. 105 is output. As the drive voltage increases, the resistance component to the voltage flowing between the source and drain increases.

  When the potential difference between the drive voltage and the control voltage approaches the threshold voltage of the field effect transistor 104a after the drain-source is rendered conductive, the resistance value between the drain and the source increases and a voltage drop of the drive voltage occurs ( Current is absorbed). In other words, the field effect transistor 104a operates to maintain a drain-source conduction state. This utilizes the property of the field effect transistor 104a that the resistance component between the source and the drain increases as the potential difference between the gate and the source decreases.

  Note that while the potential difference between the drive voltage and the control voltage is lower than the threshold voltage of the field effect transistor 104a, almost no current flows between the drain and the source, so the ground communication device 10 has an extremely high impedance. Can do.

  The reference voltage needs to be set higher than at least the operating voltage so that the operating voltage does not fluctuate due to a voltage drop of the drive voltage between the drain and source. In addition, when the magnitude of the power wave received by the receiving antenna 100 is near the specified minimum level, the voltage control unit 104 is configured so that the potential difference between the drive voltage and the control voltage exceeds the threshold voltage of the field effect transistor 104a. It is necessary to adjust the resistance.

  The Zener diode 104b limits the maximum value of the control voltage applied to the gate of the field effect transistor 104a. A reference voltage is applied to the Zener voltage of the Zener diode 104b. By mounting this Zener diode 104b, an excessive power wave is received, and even when a drive voltage exceeding the rated voltage of the operating voltage generating unit 105 is rectified by the power wave rectifying unit 102, it is output to the operating voltage generating unit 105. The maximum value of the drive voltage to be generated can be suppressed to a voltage approximately equal to or lower than a value obtained by subtracting the threshold voltage of the field effect transistor from the Zener voltage of the Zener diode. Concomitantly, the gate voltage of the field effect transistor 104a is limited to a reference voltage or lower, so that the current output from the voltage limiting unit 104 can be suppressed to a predetermined value or lower. The field effect transistor 104a is an example of a voltage adjustment unit, and the Zener diode 104b is an example of a voltage limiting unit.

  Note that the Zener diode 104b may be replaced with a circuit that generates a constant voltage by a combination of a transistor and a thyristor or the like when there is a margin in power. Further, instead of the field effect transistor 104a, a photo MOS (Metal-Oxide-Semiconductor) relay may be used. In this embodiment, in order to improve the breakdown voltage performance, the field effect transistors 104a are connected in two stages in series as shown in FIG. 2, but the number of field effect transistors 104a may be one.

  FIG. 5 is a diagram illustrating the relationship between the power wave and the voltage in the ground communication device 10.

  The control voltage is adjusted by the voltage doubler rectifier circuit so that the voltage increase rate is higher than the drive voltage. When the potential difference between the control voltage and the drive voltage exceeds the threshold voltage of the field effect transistor 104a, the field effect transistor 104a is turned on, and output of the drive voltage to the operating voltage generation unit 105 is started. While the potential difference between the control voltage and the drive voltage exceeds the threshold voltage of the field effect transistor 104a, the drive voltage increases according to the input amount of the power wave.

  Thereafter, the control voltage reaches a reference voltage according to the Zener voltage of the Zener diode 104b. When the drive voltage further increases and the potential difference approaches the threshold voltage of the field effect transistor 104a to about 1 V, the resistance component between the drain and the source increases, and the amount of input current to the voltage control unit 104 also increases. A voltage drop of the drive voltage occurs (saturation region). In other words, the field effect register 104a behaves so that the potential difference between the reference voltage and the drive voltage does not exceed the threshold voltage.

  When an excessive power wave is input such that the potential difference between the reference voltage and the drive voltage is equal to or lower than the threshold voltage of the field effect transistor 104a due to the voltage drop between the drain and source, the drain and source of the field effect transistor 104a The source is cut off, the output of the driving voltage is stopped, and the generation of the operating voltage is also finished.

  Note that the graph shown in FIG. 5 and the voltage range in which the resistance between the drain and the source rises are examples for explaining the operation of the terrestrial communication device 10, and the accurate values are based on the actual design. Based.

  As described above, according to the present embodiment, since the resistance component of the voltage control unit 104 increases when the received power wave increases, the ground communication device 10 can maintain a high impedance of, for example, 30 to 40Ω. The power wave from the on-vehicle communication device 11 can be efficiently received. In particular, when the potential difference between the control voltage and the drive voltage is in the vicinity of the threshold voltage of the field effect transistor 104a, the resistance component between the drain and source of the field effect transistor 104a further increases in an attempt to maintain this state. The impedance of the communication device 10 can be made higher.

  Further, when the received power wave is small, the resistance component of the voltage control unit 104 is low, so that power loss can be prevented as much as possible. As a result, the ground communication device 10 can operate with low power and can transmit a signal wave in a short period of time.

  Furthermore, even when a power wave exceeding the rated voltage of the operating voltage generation unit 105 is received from the receiving antenna 100, the drive voltage is suppressed to a reference voltage or less by the voltage control unit 104. It can prevent destruction. Furthermore, since the configuration is simple, it is possible to carry out from reception of the power wave to transmission of the signal wave in a short period of about 200 us or less.

  Furthermore, according to the present embodiment, when the reflected power to the on-board device 12 is not a problem, when it is determined that the input power is an excessive input that deviates from the expected range, the bridge in the power wave rectifying unit 102 By varying the junction capacitance of the diode 102a, it is possible to reduce the power acquired by shifting the resonance frequency of the receiving antenna 100, and to prevent the ground communication device 10 from being destroyed. As the magnitude of the received power wave increases, the voltage applied to the power wave rectifying unit 102 by the voltage limiting unit 104 increases. By utilizing the characteristics of the diode in which the magnitude of the junction capacitance varies depending on the voltage rise of the voltage limiting unit 104 and the magnitude of the reverse voltage, the junction capacitance variation of the bridge diode 102a that affects the resonance of the receiving antenna 100 causes When the input power is excessive, the degree of coupling between the ground communication device 10 and the on-board communication device 11 and thus the acquired power can be reduced.

  For example, the specifications of the ground communication device and the on-vehicle communication device may differ depending on the route in which they are used. If a mobile unit enters a route with different specifications such as the ground communication device, the ground communication device is excessive. May receive excessive power. Such a situation can also occur when there is a difference in performance of a ground communication device or the like between manufacturers. In order to contribute to smooth transportation by a mobile object, the ground communication device is required not to break down even when excessive power is received. As a contrivance for this, it is conceivable to simply mount a voltage limiting element such as a Zener diode via the ground immediately after the rectifier circuit, but in this case, most of the power flows to the ground and approaches a short circuit state. Therefore, the input impedance of the ground communication device (when viewed from the transmitting antenna of the on-board communication device, the load antenna of the ground communication device and the total load such as the rectifier circuit connected to this is equivalently shown) is reduced. End up. In this case, the power wave that the on-board communication device can output to the ground communication device decreases, or the impedance of the on-board communication device is drawn into the input impedance of the ground communication device, and the impedance of the on-board communication device viewed from the on-board device decreases. However, there is a problem that the reflected power wave to the on-board device increases. The change in the impedance of the on-board communication device increases as the degree of coupling between the two increases, such as when the on-board communication device and the ground communication device are close to each other.

  However, according to the present embodiment, it is possible to achieve both the protection of the circuit from an excessive power wave and the maintenance of a high ground communication device input impedance. Furthermore, since it is not necessary to add to the receiving antenna 100 Zener diodes having different capacitance values depending on the input voltage, there is an advantage that the receiving antenna 100 can be easily matched. Moreover, since the ground communication apparatus 10 does not need to detect the fluctuation | variation of the impedance of the receiving antenna 100, it can also avoid the increase in power consumption.

  Even when an excessive power wave is received, the rectified power that flows directly to the ground via the Zener diode 104b, that is, the component that appears to be a short circuit is about 20% of the received power wave. Since it is suppressed, power loss can be suppressed as much as possible.

  Note that the ratio of the power wave distributed by the power distribution unit 101 is such that the voltage control unit 104 starts outputting the drive voltage at the time when the power wave of the lowest level specified in advance is input, and the highest level specified in advance. It is desirable to adjust so that the voltage control unit 104 can stop the output of the drive voltage when a power wave exceeding 1 is input. The more power is distributed to the control rectifier 103, the faster the conduction between the drain and source of the field effect transistor 104a, and the time required to transmit the signal wave can be shortened. On the other hand, the more power that is distributed to the power wave rectifying unit 102, the more the power that flows to the ground via the Zener diode 104b can be suppressed, and the decrease in the impedance of the ground communication device 10 can be suppressed as much as possible.

  Moreover, although the control rectifier 103 is configured by a voltage doubler rectifier circuit, a general rectifier circuit may be applied. In this case, the distribution ratio output from the power distribution unit 101 to the control rectification unit 103 is made larger than the distribution ratio output to the power wave rectification unit 102.

  Next, Example 2 of the present invention will be described. The configuration, effects, and the like in this example are the same as those in Example 1 unless otherwise specified. For this reason, the differences between the present embodiment and the first embodiment will be mainly described below, and the description of the common points will be omitted as much as possible in order to avoid duplication.

  FIG. 6 is a block diagram of the ground communication device 10 according to the present embodiment. The ground communication device 10 includes a communication unit 201 that includes a communication control circuit, a relay, and the like in order to exchange information with an external device 200 such as a signal device. Information from the external device 200 is converted into a signal wave by the modulation unit 111 and transmitted to the on-vehicle communication device 11 via the transmission antenna 108 and the like. For example, the external device 200 can centrally control the operation of each vehicle body 2.

  Note that a receiving antenna and a receiving circuit for receiving a signal wave from the on-vehicle communication device 11 may be further provided, and information based on the signal wave may be transmitted to the external device 200. The external device 200 can monitor the operation status of each vehicle body 2 based on the collected information, for example.

  Further, it has a modulated wave detection antenna 202 having a diameter smaller than that of the receiving antenna 100 and a modulated wave detection unit 203 that detects an envelope of the power wave, and ASK (Amplitude Shift) of the power wave received from the on-board communication device 11. Keying) may be detected. In this case, the control unit 110 has an ASK demodulation function and the like, and may stop transmission of a signal wave or rewrite the message storage unit 109 according to demodulated data.

  According to the present embodiment, the ground communication device 10 is a relay device that transmits information from the on-board communication device 11 to the external device 200 or transmits information from the external device 200 to the on-board communication device 11. Can work.

  Next, Embodiment 3 of the present invention will be described. Since the configuration, effects, and the like in the present embodiment are the same as those in the first embodiment unless otherwise specified, differences between the present embodiment and the first embodiment will be mainly described below.

  FIG. 7 is a block diagram of the ground communication device 10 according to the present embodiment. The ground communication device 10 includes a transmission / reception antenna 700 instead of the reception antenna 100 and the transmission antenna 108. The transmission / reception antenna 700 is connected to a two-frequency matching unit 701 that is adjusted to achieve matching at two transmission / reception frequencies defined in advance. The power wave received from the on-board communication device 11 and the signal wave transmitted to the on-board communication device 11 are separated by the duplexer 702. The power wave received from the on-vehicle communication device 11 is sent to the power distribution unit 101 by the duplexer 702. The signal wave generated by the signal wave generation / amplification unit 106 of the ground communication device 10 is input to the duplexer 702 and transmitted to the on-vehicle communication device 11 through the two-frequency matching unit 701 and the transmission / reception antenna 700 as it is.

  Note that an insulating transformer may be inserted between the two-frequency matching unit 701 and the duplexer 702 to insulate the antenna portion from the circuit portion.

  According to the present embodiment, although it is necessary to add a new device by using one antenna, the electromagnetic coupling between the receiving antenna 100 and the transmitting antenna 108 is eliminated, and the radiation efficiency can be improved. . Further, since the influence of the capacity of the rectifier diode of the power distribution unit 101 on the two-frequency matching unit 701 is reduced by passing the duplexer 702, there is an advantage that the matching of the transmission / reception antenna 700 can be easily performed.

  Next, a fourth embodiment of the present invention will be described. Since the configuration, effects, and the like in the present embodiment are the same as those in the first embodiment unless otherwise specified, differences between the present embodiment and the first embodiment will be mainly described below.

  In the present embodiment, a resonance coil is added to the receiving antenna 100 in the first embodiment.

  FIG. 8 is a block diagram of the ground communication device 10 according to the present embodiment. In this embodiment, a resonance coil 80 that operates in combination with the receiving antenna 100 and a resonance circuit unit 801 that resonates at the frequency of the power wave are provided.

  Conventionally, as the degree of coupling between the on-board communication device 11 and the ground communication device 10 increases, the impedance variation of the on-board communication device 11 increases, so that the reception antenna of the ground communication device 10 has an electromagnetic coupling degree. It has been difficult to improve power transmission efficiency by taking measures such as adding the resonance coil 800 to be enhanced. However, by suppressing a decrease in the input impedance of the ground communication device, even if the resonance coil 800 and the resonance circuit unit 801 are mounted, fluctuations in the input impedance of the antenna of the on-vehicle communication device 11 can be suppressed. By adding the resonance coil 800 or the like, the power transmission efficiency can be greatly improved particularly when the received power wave is small. Therefore, it is possible to reduce the power consumption of the terrestrial communication device 10 and thus to reduce the power consumption of the entire system.

  Further, by adding the resonance coil 800 or the resonance coil 800 having the resonance circuit unit 801, the receiving antenna 100 can be matched, so that there is an advantage that it is not necessary to provide a resonance circuit on the antenna side. The capacitance of the diode included in the power rectifying unit 102 or the like is useful because it varies depending on temperature or the like.

  Note that the resonance coil 800 may be adjusted so as to resonate at the frequency of the power wave due to a capacitive component generated by the distance from the receiving antenna 100. Moreover, you may make it add the resonance coil 800 grade | etc., To the ground communication apparatus 10 (refer FIG. 7) which concerns on Example 3. FIG. In this case, the same effect is obtained.

  Next, a fifth embodiment of the present invention will be described. The configuration and effects in the present embodiment are the same as those in the first embodiment unless otherwise specified. However, since the present embodiment has many points in common with the fourth embodiment, differences between the present embodiment and the fourth embodiment will be mainly described below.

  FIG. 9 is a block diagram of the ground communication device 10 according to the present embodiment. The ground communication device 10 includes a control voltage acquisition antenna 900 instead of the power distribution unit 101. The control voltage acquisition antenna 900 is configured by an antenna having a smaller diameter than the receiving antenna 100. The power wave received by the receiving antenna 100 is transmitted to the power wave rectifier 102 as it is to generate a drive voltage. In addition, the power wave received by the control voltage acquisition antenna 900 is transmitted to the control rectification unit 103 to generate a control voltage. The control voltage antenna 900 may be provided with a matching circuit that resonates at a power wave frequency.

  According to the present embodiment, since it is not necessary to distribute the received power wave, it is possible to improve the characteristics when a particularly small power wave is received.

  As shown in FIG. 10, a control voltage acquisition antenna 900 may be added to the ground communication device 10 (see FIG. 7) according to the third embodiment. In this case, the same effects as in the present embodiment are obtained.

  In addition, this invention is not limited to each Example, Various modifications including what was already illustrated can be considered. For example, the ground communication device 10 has the signal wave generation amplification unit 106 and the like to transmit a signal wave to the on-board communication device 11, but instead of this, a power wave from the on-board communication device 11 is used. May be determined that the vehicle body 2 is traveling in the vicinity of the ground communication device 10, and the external device 200 or the like may be notified of this.

  Further, the on-board communication device 11 does not need to be a separate body from the on-board device 12, and may be an integrated type having the functions of the on-board device 12. Further, for example, the present invention may be applied to a non-power-source on-board communication device that operates by receiving a power wave transmitted from a ground communication device. In addition, the present invention may be applied to a communication system using, for example, NFC (Near Field Communication), RFID (Radio Frequency IDentification), non-contact power transmission, or other wireless communication methods. The present invention is particularly effective in the case where high electromagnetic coupling occurs when the transmitting antenna and the receiving antenna are close to each other.

  Each embodiment has been described in detail for the sake of understanding of the present invention, and the present invention does not necessarily have to include all the above-described configurations. A part of one embodiment can be replaced with a part of another embodiment, and a part of one embodiment can be added to another embodiment.

  Furthermore, the control lines and information lines on each drawing are those that are considered necessary for explanation, and not all the control lines and information lines necessary for implementing the present invention are shown. For example, all the configurations may be connected to each other. Conversely, when implementing the present invention, it is not necessary to provide all the control lines and information lines on each drawing.

DESCRIPTION OF SYMBOLS 1 Mobile body control system 2 Car body 10 Ground communication apparatus 11 On-vehicle communication apparatus 12 On-board apparatus 100 Reception antenna 101 Power distribution part 102 Power wave rectification part 103 Control rectification part 104 Voltage control part 105 Operating voltage generation part 106 Signal wave generation amplification Unit 107 matching unit 108 transmission antenna 109 message storage unit 110 control unit 111 modulation unit 112 signal wave amplification unit 200 external device 201 communication unit 202 modulation wave detection antenna 203 modulation wave detection unit 500 power wave rectification unit destruction prevention circuit 700 transmission / reception antenna 701 Two-frequency matching unit 702 duplexer 800 resonance coil 801 resonance circuit unit 900 control voltage acquisition antenna

Claims (12)

A power wave receiver that receives the power wave;
A driving voltage generating unit that generates a driving voltage from the power wave received by the power wave receiving unit;
A voltage adjusting unit having a resistance component with respect to the driving voltage generated by the driving voltage generating unit;
An operating voltage generating unit that generates an operating voltage from the driving voltage output by the voltage adjusting unit;
A signal wave generator that generates a signal wave using the operating voltage generated by the operating voltage generator as a power source;
A signal wave radiation unit that radiates the signal wave generated by the signal wave generation unit,
The ground communication device according to claim 1, wherein when the driving voltage input to the voltage adjustment unit increases, a resistance component of the voltage adjustment unit increases. A control voltage generator that generates a control voltage higher than the drive voltage from the power wave received by the power wave receiver;
The voltage adjustment unit inputs the control voltage generated by the control voltage generation unit,
The ground communication device according to claim 1, wherein a resistance component of the voltage adjustment unit increases as a difference between the drive voltage and the control voltage input to the voltage adjustment unit increases. A control voltage generating unit that generates a control voltage higher than the drive voltage from the power wave received by the power wave receiving unit;
A voltage limiting unit that limits the control voltage to a predetermined voltage or less,
The voltage adjustment unit inputs the control voltage generated by the control voltage generation unit,
The ground communication device according to claim 1, wherein when the difference between the drive voltage and the control voltage input to the voltage adjustment unit is reduced, a resistance component of the voltage adjustment unit is increased.   The ground communication device according to claim 3, wherein the voltage adjustment unit outputs the drive voltage when a difference between the input drive voltage and the control voltage exceeds a threshold value.   The ground communication device according to claim 3, wherein the voltage adjustment unit does not output the drive voltage when a difference between the input drive voltage and the control voltage is equal to or less than a threshold value.   The ground communication apparatus according to claim 3, wherein the voltage limiting unit grounds a control voltage exceeding a predetermined voltage. A communication unit for receiving predetermined information from an external device;
The ground communication apparatus according to claim 1, wherein the signal wave generation unit generates a signal wave having predetermined information received by the communication unit.   2. The ground communication apparatus according to claim 1, wherein the power wave receiving unit and the signal wave radiating unit share one antenna.   The ground communication apparatus according to claim 1, further comprising a resonance unit that resonates at a frequency of a power wave received by the power wave reception unit.   The power wave receiving unit has a plurality of antennas for receiving power waves, generates the drive voltage from a power wave received by one antenna, and generates a control voltage from the power wave received by another antenna. The ground communication apparatus according to claim 2, wherein A receiving antenna for receiving power waves;
An operating voltage generator for generating an operating voltage based on the power wave received by the receiving antenna;
A signal wave generating unit that generates a signal wave with the operating voltage generated by the operating voltage generating unit;
A terrestrial communication device comprising: a transmission antenna that radiates a signal wave generated by the signal wave generation unit;
A plurality of capacitors for distributing a power wave received by the receiving antenna;
A rectifier circuit that rectifies power waves distributed by the plurality of capacitors to generate a drive voltage;
A voltage doubler rectifier circuit that rectifies a power wave distributed by the plurality of capacitors to generate a control voltage;
A field effect transistor having a drain terminal connected to the rectifier circuit side, a source terminal connected to the signal wave generator side, and a gate terminal connected to the voltage doubler rectifier circuit side;
A ground communication apparatus comprising:   The terrestrial communication device according to claim 11, further comprising a Zener diode that limits a control voltage generated by the voltage doubler rectifier circuit to a predetermined voltage or less.

Images