JP5788816B2 - Non-contact charger - Google Patents

Description

  The present invention relates to a non-contact charging device that charges a charged device in a non-contact manner.

  2. Description of the Related Art Conventionally, there is a non-contact charging system that charges a device to be charged by transmitting power from the charging device to the device to be charged in a non-contact manner (see, for example, Patent Document 1). Specifically, the charging device is provided with a primary coil, and the charged device is provided with a secondary coil. A power transmission pad on which the device to be charged is installed is formed on the upper surface of the charging device. The primary coil emits a low-frequency radio wave (electromagnetic wave) when excited. Electric power is induced in the secondary coil by this radio wave. This electric power is charged in a battery built in the device to be charged.

  In the future, the spread of charging devices in accordance with the WPC (Wireless Power Consortium) standard, which is an industry group of contactless charging systems, is expected. In this standard, the frequency of radio waves from the primary coil is specified as 100 kHz to 200 kHz.

  On the other hand, an electronic key system that enables locking / unlocking of a vehicle door and starting of an engine through wireless communication between the electronic key and the vehicle is mounted on the vehicle (see, for example, Patent Document 2). In this electronic key system, radio waves in the LF band (typically 134 kHz or 125 kHz) are transmitted from the vehicle to the electronic key.

JP 2008-5573 A JP 2004-92071 A

  When the charging device is mounted on a vehicle, radio frequency interference may occur because the frequencies used between the non-contact charging system and the electronic key system overlap. Specifically, when the charging device is used in a vehicle, the radio wave becomes noise for the electronic key system. As a result, there is a possibility that wireless communication between the electronic key and the vehicle, and thus the engine start, etc., may be disabled. For this reason, when mounting a non-contact charging device on the vehicle, it is required to suppress the influence on the communication of the electronic key system in order to ensure user convenience.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a non-contact charging apparatus in which the influence on communication of the electronic key system is suppressed.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
The invention according to claim 1 is provided in a vehicle having an in-vehicle device that authenticates whether or not it is a legitimate electronic key through a series of communication with the electronic key, and an alternating current is supplied to the primary coil. In the non-contact charging device that transmits power to the charged device in a non-contact manner, a detection unit that detects a start of a series of communication between the in-vehicle device and the electronic key, and a start of a series of communication through the detection unit When detected, the primary coil over the first power supply suppression time set based on the time required for the series of communications and the second power supply suppression time that starts when the first power supply suppression time has elapsed. And when the start of a new series of communications is detected through the detection means during the elapse of the second power feeding suppression time, until after the new series of communications is completed. And gist that and a power supply restricting means for extending the electric suppression time.

  According to this configuration, when the start of a series of communications is detected, the alternating current supplied to the primary coil is suppressed over the first power feeding suppression time set based on the time required for the series of communications. . Further, the alternating current supplied to the primary coil is suppressed over the second power supply suppression time that starts when the first power supply suppression time has elapsed. If a new series of communication between the electronic key and the in-vehicle device is detected during the second power supply suppression time, the power supply suppression time is extended until after the new series of communication ends. As a result, electromagnetic waves from the non-contact charging device in a mode that obstructs communication between the in-vehicle device and the electronic key are suppressed.

  According to a second aspect of the present invention, the in-vehicle device wirelessly transmits a wake signal over a plurality of times every first time until the response of the electronic key is received, and when there is a response, And authenticating whether or not it is a legitimate electronic key through a series of communications between the device and the detection means detects a series of communications between the in-vehicle device and the electronic key through the detection of the wake signal. In the first power supply suppression time, a series of communications triggered by the second wake signal is completed after the start of the series of communications is detected by detecting the first wake signal through the detection means. The gist is that it is set based on the time until time.

  According to this configuration, the first power supply suppression time is the time when the start of a series of communications is detected through the detection means by the detection of the first wake signal, and the series of communications triggered by the second wake signal is completed. It is set based on the time until. That is, the first power supply suppression time is set to a time when it is determined that a series of communications cannot be performed with the first wake signal used for detecting the start of communication. Thereby, the electromagnetic wave from the non-contact charging device of the aspect which obstructs communication between a vehicle-mounted apparatus and an electronic key is suppressed more reliably.

  According to a third aspect of the present invention, in the non-contact charging device according to the second aspect, after the authentication that the in-vehicle device is the regular electronic key through a series of communications with the electronic key, The electronic key is authenticated through a series of communications with the electronic key multiple times per time, and the power supply suppression means is provided in the current supply path to the primary coil and suppresses power supply A power supply suppression element that suppresses a supply current to the primary coil based on a command signal to the effect, and a first and a second that output the command signal to the power supply suppression element over the first and second power supply suppression times. 2 timers and timer control means for controlling the first and second timers, the timer control means from when the wake signal is detected through the detection means to the first timer through the first timer. The command signal is output to the power supply suppression element over the power supply suppression time of the first time, and the power supply suppression is performed over the second power supply suppression time through the second timer from when the first power supply suppression time has elapsed. When the command signal is output to the element and the wake signal is detected through the detection means during the elapse of the second power supply suppression time, the second timer is reset and the second timer is again passed through the first timer. The gist is to output the command signal to the power supply suppression element over one power supply suppression time.

  According to this configuration, the power feeding suppression time can be extended with a simple configuration using two general timers as long as a series of communications is repeated. Also, the power supply to the primary coil is restored faster than when only one timer is used. This is because when one timer is used, the timer is reset at any time of the first power supply suppression time and the second power supply suppression time, so both power supply suppression times are added from the last bit in a series of communications. Suppressing power supply over the combined time. In that respect, when two timers are used as in the above configuration, the reset is not performed during the first power supply suppression time, so power supply is suppressed over the time obtained by adding both power supply suppression times from the beginning of the wake signal. Is done. Therefore, the power supply return to the primary coil can be accelerated.

  In addition, since the time for resetting the timer can be limited to the second power feeding suppression time, the number of resets can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the influence with respect to communication of an electronic key system can be suppressed in a non-contact charging device.

The block diagram which shows the structure of the vehicle in one Embodiment of this invention, an electronic key, and a portable terminal. The timing chart regarding a series of communication between the vehicle-mounted apparatus and electronic key in one Embodiment of this invention. The perspective view of the non-contact charging device with which the portable terminal in one Embodiment of this invention was installed in the power transmission pad. The block diagram which shows the structure of the interference suppression part etc. in one Embodiment of this invention. The timing chart regarding the electric power supply stop time of the non-contact charging device in one Embodiment of this invention, and the radio signal from a vehicle-mounted apparatus. The timing chart regarding the electric power supply stop time of the non-contact charging device in one Embodiment of this invention, and the radio signal from a vehicle-mounted apparatus. (A) in one embodiment of the present invention is a timing chart showing a setting mode of power supply stop time when there is one timer, (b) is an enlarged view of (a), and (c) is when there are two timers The timing chart which showed the setting aspect of the electric power supply stop time. The block diagram which showed a part of structure of the non-contact charging device and vehicle equipment in other embodiment.

Hereinafter, an embodiment of a non-contact charging device according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the vehicle includes a non-contact charging device 40 and an in-vehicle device 20. This in-vehicle device 20 permits the start of the engine through mutual communication with the electronic key 10 possessed by the user. The non-contact charging device 40 is configured to be able to charge the mobile terminal 50 possessed by the user in a non-contact manner. Hereinafter, specific configurations of the electronic key 10, the in-vehicle device 20, the non-contact charging device 40, and the portable terminal 50 will be described.

<Electronic key>
The electronic key 10 includes an electronic key control unit 11 configured by a computer unit including a CPU. The electronic key control unit 11 is connected to an LF receiving unit 12 that receives a radio signal in the LF (Low Frequency) band and a UHF transmission unit 13 that transmits a radio signal in the UHF (Ultra High Frequency) band. . The electronic key control unit 11 includes a memory 11a, and a vehicle ID code, a key ID code, and an encryption key are stored in the memory 11a.

  As shown in FIG. 2, the LF receiver 12 receives an LF band wake signal from the in-vehicle device 20 through the reception antenna 12a. Then, the LF receiver 12 demodulates the wake signal into a pulse signal and outputs it to the electronic key controller 11.

  When the electronic key control unit 11 recognizes the wake signal, the electronic key control unit 11 generates an ACK signal and outputs it to the UHF transmission unit 13. The UHF transmission unit 13 modulates the ACK signal and transmits it as a radio signal in the UHF band via its transmission antenna 13a.

  When receiving the vehicle signal via the receiving antenna 12a, the LF receiving unit 12 demodulates the vehicle signal into a pulse signal and outputs the pulse signal to the electronic key control unit 11. When the electronic key control unit 11 recognizes the vehicle signal, the electronic key control unit 11 collates the vehicle ID code included in the signal with the vehicle ID code stored in the memory 11a (vehicle ID collation). When the electronic key control unit 11 determines that vehicle ID code verification has been established, the electronic key control unit 11 wirelessly transmits an ACK signal in the same manner as described above.

  When the LF receiving unit 12 receives the challenge signal via the receiving antenna 12a, the LF receiving unit 12 demodulates the challenge signal into a pulse signal and outputs the pulse signal to the electronic key control unit 11. When the electronic key control unit 11 recognizes the challenge signal, the electronic key control unit 11 generates a response code by encrypting the challenge code included in the challenge signal using the encryption key stored in the memory 11a. Then, the electronic key control unit 11 generates a response signal including the generated response code and the key ID code stored in the memory 11a, and outputs the generated response signal to the UHF transmission unit 13. The UHF transmission unit 13 modulates the response signal and transmits it as a UHF band radio signal via its own transmission antenna 13a.

<In-vehicle device>
As shown in FIG. 1, the in-vehicle device 20 includes an ECU 21 configured by a computer unit. The ECU 21 is connected to a UHF receiver 24 that receives a radio signal in the UHF band and an LF transmitter 23 that transmits a radio signal in the LF band. The LF transmission antenna 23 a is connected to the LF transmission unit 23 via an interference suppression unit 43 that constitutes the non-contact charging device 40. The configuration and operation of the interference suppression unit 43 will be described in detail later.

  Further, as shown in FIG. 1, an engine switch 33 and a courtesy switch 34 are connected to the ECU 21. The courtesy switch 34 detects the open / closed state of the vehicle door, and outputs the detection result to the ECU 21. The engine switch 33 is provided in the vicinity of the driver's seat so that it can be pushed. When the engine switch 33 is pushed, an operation signal to that effect is output to the ECU 21.

The ECU 21 includes a non-volatile memory 21a, in which the same key ID code and vehicle ID code as the electronic key 10 and an encryption key are stored.
For example, when the ECU 21 determines that the vehicle door has been opened and closed through the courtesy switch 34 after the engine is stopped, the ECU 21 generates a wake signal to detect whether the electronic key 10 is taken out of the vehicle, and the generated wake signal is transmitted to the LF transmission unit. To 23. The LF transmission unit 23 modulates the wake signal from the ECU 21 and transmits the modulated wake signal into the vehicle via the LF transmission antenna 23a.

  The UHF receiver 24 receives an ACK signal for the wake signal via the reception antenna 24a, demodulates the received signal into a pulse signal, and outputs the pulse signal to the ECU 21. When the ECU 21 recognizes this ACK signal, the ECU 21 generates a vehicle signal including a vehicle ID code stored in the memory 21 a and outputs the generated vehicle signal to the LF transmission unit 23. The LF transmission unit 23 modulates the vehicle signal and transmits the modulated vehicle signal as an LF band radio signal via its own LF transmission antenna 23a.

  As shown in FIG. 5, when the ECU 21 cannot recognize the ACK signal from the electronic key 10 after the first transmission of the wake signal, the ECU 21 transmits the wake signal again after a predetermined time T1 has elapsed since the completion of the transmission of the wake signal. . This retransmission of the wake signal is performed a plurality of times.

  The UHF receiving unit 24 receives an ACK signal for the vehicle signal via the receiving antenna 24a, demodulates the received signal into a pulse signal, and outputs the pulse signal to the ECU 21. When the ECU 21 recognizes the ACK signal, the ECU 21 generates a challenge signal including the challenge code and outputs it to the LF transmitter 23. The LF transmission unit 23 modulates the challenge signal and transmits the modulated challenge signal as an LF band radio signal via its own LF transmission antenna 23a. At this time, the ECU 21 generates a response code by encrypting the challenge code using the encryption key stored in the memory 21a.

  The UHF receiver 24 demodulates the response signal received via the receiving antenna 24a and outputs the demodulated signal to the ECU 21. When the ECU 21 recognizes the response signal, the ECU 21 collates the key ID code included in the response signal with the key ID code stored in the memory 21a (key ID collation). Further, the ECU 21 collates the response code included in the response signal with the response code generated by itself (response collation). When the ECU 21 determines that the key ID collation and the response collation are established, the collation is established. The transmission / reception of the wake signal, the ACK signal, the vehicle signal, the challenge signal, and the response signal between the electronic key 10 and the in-vehicle device 20 described above is referred to as “a series of communications”. As shown in FIG. 2, this series of communications requires a communication time T3. These signals are composed of a combination of a number of Hi bits and Lo bits.

  Further, the ECU 21 transmits the wake signal, the vehicle signal, or the challenge signal again when there is no response to the wake signal, the vehicle signal, or the challenge signal due to the influence of ambient noise or the like. The challenge signal or the response signal is retransmitted a plurality of times. Therefore, the communication time T3 required for a series of communications varies depending on the number of transmissions of the wake signal, challenge signal, and response signal.

  Here, the number of times the above collation (a series of communications) is performed varies depending on the vehicle condition. For example, when the ECU 21 determines that the vehicle door has been opened and closed through the courtesy switch 34 after the engine is stopped when the user gets off, the ECU 21 performs both of the above verifications only once to determine whether or not the electronic key 10 has been taken out of the passenger compartment. A series of communications). When the ECU 21 determines that both of the above verifications are established, the ECU 21 prohibits the locking of the vehicle door on the assumption that the electronic key 10 exists in the vehicle interior. If the ECU 21 determines that both of the above verifications are not established, the ECU 21 permits the vehicle door to be locked, assuming that the electronic key 10 does not exist in the vehicle interior. Thereby, confinement of the electronic key 10 in the vehicle interior can be suppressed. In this way, collating using any event (in this example, opening and closing of the vehicle door after the engine is stopped) as a trigger is referred to as event collation.

  In addition, as shown in FIG. 6, when the ECU 21 determines that the vehicle door is opened and closed through the courtesy switch 34 after unlocking the vehicle door with the user's boarding, is the regular electronic key 10 present in the vehicle interior? In order to determine whether or not, the series of communication (collation) is performed a plurality of times. The ECU 21 performs a series of communications (collation) at regular time intervals T2 in a state where the collation is established. As long as collation is established for each series of communications, a series of communications is not performed for a certain time T2. If the ECU 21 determines that the predetermined collation is not established, the ECU 21 performs a series of communications (collation) after a certain time shorter than the certain time T2.

  When the ECU 21 recognizes that the engine switch 33 has been operated in a state where the above two verifications are established, the ECU 21 is started. Such verification in advance of user operation is called prior verification.

<Non-contact charging device and portable terminal>
As shown in FIG. 3, the non-contact charging device 40 has a power transmission pad 40 a on which the portable terminal 50 can be installed. The non-contact charging device 40 is attached to the vehicle interior with the power transmission pad 40a exposed. The user can charge the portable terminal 50 simply by placing the portable terminal 50 on the power transmission pad 40a.

As shown in FIG. 1, in addition to the interference suppression unit 43 described above, the non-contact charging device 40 includes a charging control device 41, a plurality of excitation circuits 42, and the same number of primary coils L1.
The portable terminal 50 includes a secondary coil L2, a rectifier circuit 52, a converter 53, a battery 54, and a load modulation circuit 55.

  Each primary coil L1 is provided along the power transmission pad 40a inside the apparatus. The primary coil L1 is a spiral coil. Each primary coil L <b> 1 is connected to each excitation circuit 42. Each excitation circuit 42 is connected between the power supply and the ground.

  The charging control device 41 supplies an alternating current to the primary coil L1 through the excitation circuit 42. Thereby, the primary coil L1 is excited and emits radio waves (electromagnetic waves). As described in the background art, the frequency of the radio wave is specified as 100 kHz to 200 kHz in the WPC standard. The charge control device 41 monitors the current supplied to the primary coil L1.

  In a state where the portable terminal 50 is installed on the power transmission pad 40a, the axis of the secondary coil L2 is orthogonal to the surface of the power transmission pad 40a. The secondary coil L2 induces a current by electromagnetic waves from the primary coil L1 (electromagnetic induction). The rectifier circuit 52 converts the induced alternating current into a direct current, and outputs the converted current to the converter 53. Converter 53 steps down or boosts the power and supplies the power to battery 54. Thereby, the battery 54 is charged.

  The charging control device 41 performs polling to determine whether or not the mobile terminal 50 is installed on the power transmission pad 40a. Specifically, the charging control device 41 excites the primary coil L1 by intermittently supplying an alternating current to the primary coil L1. As a result, a polling signal (radio wave) is transmitted from the primary coil L1.

  The load modulation circuit 55 of the portable terminal 50 performs load modulation when receiving a polling signal through the secondary coil L2. Specifically, when receiving a polling signal, the load modulation circuit 55 switches between a connection state in which a load (not shown) is connected to the secondary coil L2 and a non-connection state in which no load is connected to the secondary coil L2. . When in this connected state, the impedance viewed from the primary coil L1 magnetically coupled to the secondary coil L2 changes from the disconnected state. Therefore, the current supplied to the primary coil L1 changes. The charging control device 41 determines that the portable terminal 50 is installed on the power transmission pad 40a through this change in current, and when it is determined to do so, the primary coil L1 is continuously excited to actually activate the portable terminal 50. Charge the battery.

  A drain terminal and a source terminal of an FET (Field Effect Transistor) 49 are connected between each excitation circuit 42 and the power source. Normally, the FET 49 is in a conductive state (on state) between the drain terminal and the source terminal, and power from the power source is supplied to each excitation circuit 42. When a voltage equal to or higher than a certain value is applied to the base terminal of the FET 49 by the interference suppressing unit 43, the drain terminal and the source terminal of the FET 49 are in a non-conductive state (off state). Therefore, power supply from the power source to each excitation circuit 42 is interrupted.

Next, the interference suppression unit 43 will be described.
As shown in FIG. 4, the interference suppression unit 43 senses the current value of the wake signal (alternating current) sent from the LF transmission unit 23 to the LF transmission antenna 23 a, and based on the detection result of the sensor 44, A processing circuit 45 for controlling the gate voltage and a substrate 47 on which these are disposed are provided.

  The board 47 is provided with first and second connectors 47a and 47b. The first connector 47a is connected to a second connector 25a provided at the tip of a harness (conductor) 25 for sending a request signal from the LF transmitter 23 to the LF transmission antenna 23a. The second connector 47b is provided on the LF transmission antenna 23a and is connected to the first connector 23b for receiving a request signal. The first connectors 23b and 47a are the same, and the second connectors 25a and 47b are the same. That is, in the configuration without the interference suppression unit 43, the first connector 23b can be connected to the second connector 25a.

  The processing circuit 45 includes two timers 48a and 48b and a comparator 46b. When the current value detected through the sensor 44 based on the wake signal from the LF transmitter 23 becomes equal to or greater than the threshold value, the comparator 46b outputs a trigger signal to the first timer 48a assuming that a series of communications is started. When receiving the trigger signal, the first timer 48a starts counting the first power supply stop time Ts1, and outputs a Hi signal to the base terminal of the FET 49 and the comparator 46b over the first power supply stop time Ts1. The FET 49 is turned off through this Hi signal. Note that the first timer 48a is not reset during the elapse of the first power supply stop time Ts1.

  When the Hi signal from the first timer 48a cannot be detected due to the elapse of the first power supply stop time Ts1, a trigger signal is input to the second timer 48b, and the second timer 48b Counting of the time Ts2 is started, and a Hi signal is output to the base terminal of the FET 49 over the second power supply stop time Ts2. Thereby, the OFF state of the FET 49 is maintained for at least the second power supply stop time Ts2 even after the first power supply stop time Ts1 has elapsed. Accordingly, the total power supply stop time Ta is set to be equal to or longer than the sum of the first power supply stop time Ts1 and the second power supply stop time Ts2.

  Further, when the current value detected through the sensor 44 based on the wake signal from the LF transmitter 23 becomes equal to or greater than the threshold during the output of the Hi signal in the second timer 48b, the second timer 48b is reset. The trigger signal is again output to the first timer 48a. When receiving the trigger signal again, the first timer 48a starts counting the first power supply stop time Ts1, and outputs the Hi signal to the base terminal of the FET 49 and the comparator 46b over the first power supply stop time Ts1. To do. Similarly to the above, the second timer 48b starts counting the second power supply stop time Ts2 after the first power supply stop time Ts1 has elapsed, and the base of the FET 49 over the second power supply stop time Ts2. A Hi signal is output to the terminal. That is, in the case of prior verification, the total power supply stop time Ta can be extended by resetting the first power supply stop time Ts1 and the second power supply stop time Ts2.

The first power supply stop time Ts1 and the second power supply stop time Ts2 are set from the following viewpoints.
As shown in FIG. 5, the interference suppression unit 43 stops power supply to each excitation circuit 42 through the first detection of the wake signal. For this reason, the first wake signal and the electromagnetic wave from the non-contact charging device 40 are simultaneously output for the delay time Td. Therefore, the electronic key control unit 11 cannot recognize the first wake signal via the LF reception unit 12 or the like and cannot return an ACK signal. When the ECU 21 cannot receive the ACK signal, the ECU 21 transmits the second wake signal after a predetermined time T1 has elapsed from the completion of the transmission of the first wake signal, and performs a series of communications through the wake signal.

The first power supply stop time Ts1 is set to a time obtained by subtracting the delay time Td from the series of communication times T3. The series of communication times T3 here is the longest time required for a series of communications.
Since the first timer 48a is not reset through detection of the second wake signal or the like during the elapse of the first power supply stop time Ts1, the first timer 48a performs the first communication through a series of communications through the second wake signal. The power supply stop time Ts1 is not reset.

  The second power supply stop time Ts2 is set to a time obtained by adding a minute time Te to a series of communication cycles (predetermined time T2) in the prior verification. The minute time Te is set so that at least a part of the next wake signal can be received. As a result, as shown in FIG. 6, the third wake signal can be detected within the second power supply stop time Ts2.

Next, with reference to FIG. 6, an extension mode of the power supply stop time in the case of prior verification as an operation of the interference suppression unit 43 will be described.
The comparator 46b stops power supply to the primary coil L1 through the first timer 48a for the first power supply stop time Ts1 from when the first wake signal is detected through the sensor 44. Then, the comparator 46b stops power supply to the primary coil L1 through the second timer 48b for the second power supply stop time Ts2 after the first power supply stop time Ts1 has elapsed. Here, when the third wake signal is detected through the sensor 44 at time t1 during which the second power supply stop time Ts2 has elapsed, the comparator 46b again returns to the first power supply stop time through the first timer 48a. Power supply is stopped over Ts1, and after the first power supply stop time Ts1 has elapsed, power supply is stopped over the second power supply stop time Ts2 through the second timer 48b. Thus, as long as a series of communications is repeated in the prior verification, the total power supply stop time Ta is extended. Therefore, the electromagnetic waves from the non-contact charging device 40 in a mode that obstructs communication between the in-vehicle device 20 and the electronic key 10 are suppressed.

  In the case of event verification, the interference suppression unit 43 turns on the FET 49 after the first second power supply stop time Ts2 has elapsed, thereby supplying power to the primary coil L1, and thus charging the mobile terminal 50. To resume.

As described above, according to the embodiment described above, the following effects can be obtained.
(1) When the start of a series of communications is detected, the alternating current supplied to the primary coil L1 is suppressed over a first power supply stop time Ts1 set to a time including a series of communications times T3. . Moreover, the alternating current supplied to the primary coil L1 is suppressed over the 2nd electric power feeding stop time Ts2 started when the 1st electric power feeding stop time Ts1 passed. If a new series of communications is detected between the electronic key 10 and the in-vehicle device 20 during the elapse of the second power supply stop time Ts2, the total power supply stop time Ta is extended. Accordingly, the total power supply stop time Ta is set according to the above-described prior verification (repetition of a series of communications). Thereby, the electromagnetic waves from the non-contact charging device 40 in a mode that obstructs communication between the in-vehicle device 20 and the electronic key 10 while minimizing the total power supply stop time Ta are suppressed.

  (2) The first power supply stop time Ts1 is used for authentication between the in-vehicle device 20 and the electronic key 10 triggered by the second wake signal from when the start of communication is detected through the first wake signal. It is set to the time until a series of communication is completed. That is, the first power supply stop time Ts1 is set to a time when it is assumed that a series of communications cannot be performed with the first wake signal used for detecting the start of communication. Thereby, the electromagnetic waves from the non-contact charging device 40 in a mode that obstructs communication between the in-vehicle device 20 and the electronic key 10 are more reliably suppressed.

  (3) The total power supply stop time Ta is extended as long as a series of communications is repeated using the comparator 46b and the two timers 48a and 48b. As described above, the effects (1) and (2) can be achieved with a simple and existing configuration.

  Further, the power supply return to the primary coil L1 can be made faster than when only one timer is used. This is because, as shown in FIG. 7A, when one timer is used, the timer is reset during the elapse of any one of the first power supply suppression time Ts1 and the second power supply suppression time Ts2. For this reason, as shown in an enlarged view in FIG. 7B, power supply is suppressed over a time obtained by adding both power supply suppression times Ts1, Ts2 from the last Hi bit in a series of communications. In this regard, when the two timers 48a and 48b are used, they are not reset during the elapse of the first power supply suppression time Ts1, and therefore, as shown in FIG. 7C, the first Hi of the wake signal in each series of communications. Power supply is suppressed over a time obtained by adding both power supply suppression times Ts1 and Ts2 from the bit. Therefore, the power supply return to the primary coil L1 can be accelerated.

  In addition, by configuring so that only the second timer 48b can be reset, the resettable period can be limited to the second power feeding suppression time Ts2. Thus, the number of resets can be reduced.

  (4) Even in the case of event collation, after the time when the start of communication is detected through the first wake signal and after the addition of both power supply stop times Ts1 and Ts2, elapse of time by the non-contact charging device 40 Charging of the terminal 50 is started. Therefore, it is possible to suppress electromagnetic waves from the non-contact charging device 40 in a mode that obstructs communication between the in-vehicle device 20 and the electronic key 10 while shortening the total power supply stop time Ta as compared with the case of prior verification.

  (5) The board 47 on which various electronic components of the interference suppression unit 43 are provided is provided with first and second connectors 47a and 47b. The first connector 47a is connected to a second connector 25a provided at the tip of a harness (conductor) 25 for sending a request signal from the LF transmitter 23 to the LF transmission antenna 23a. The second connector 47b is connected to the first connector 23b for receiving a request signal from the harness 25 as well as being provided to the LF transmission antenna 23a. Thereby, the interference suppression part 43 can be easily connected between the harness 25 and the LF transmission antenna 23a. In particular, it becomes easy to retrofit the interference suppressing unit 43 to the existing configuration.

  (6) Since the first timer 48a is not reset through the detection of the second wake signal or the like during the elapse of the first power supply stop time Ts1, it is continuously performed by a series of communications through the second wake signal. It is suppressed that the first power supply stop time Ts1 is reset.

  (7) When the ECU 21 determines that the predetermined collation is not established, the ECU 21 performs a series of communications (collation) after a certain time shorter than the certain time T2. Even in this case, since the second timer 48b is reset during the elapse of the predetermined time T2, the both power supply stop times Ts1 and Ts2 are appropriately set.

In addition, the said embodiment can be implemented with the following forms which changed this suitably.
In the above embodiment, the power supply stop times Ts1 and Ts2 are set through the two timers 48a and 48b, respectively. However, one timer may be used. In this case, the power supply stop time is set over a certain time from when the first wake signal is detected. This fixed time may be, for example, the second power supply stop time Ts2. In this configuration, the second power supply stop time Ts2 is continuously reset through detection of the second wake signal, vehicle signal, and challenge signal. This is because the type of wake signal, vehicle signal, and challenge signal cannot be determined from the detection result of the sensor 44. Therefore, the second power supply stop time Ts2 is set immediately before the transmission of the challenge signal is completed, and the same effect as the above embodiment can be obtained.

  In the above embodiment, the comparator 46b is employed as the timer control means. However, for example, a CPU (Central Processing Unit) may be used as long as it is a timer control means. Even in the case of the CPU, it is possible to output trigger signals to the first and second timers 48a and 48b based on the detection result of the sensor 44 and the like, similarly to the comparator 46b.

  In the above embodiment, the interference suppression unit 43 is connected by wire between the harness 25 and the LF transmission antenna 23a. However, as shown in FIG. 8, the interference suppression unit 60 may be configured separately from the LF transmission unit 23 and the LF transmission antenna 23a. The interference suppression unit 60 includes an LF reception antenna 60a, a signal amplification unit 60b, a rectification smoothing unit 60c, a comparator 46b, a first timer 48a, and a second timer 48b.

  When receiving the wake signal, the LF receiving antenna 60a outputs the received signal to the signal amplifying unit 60b. When the signal amplifying unit 60b amplifies the received signal, the amplified signal is output to the rectifying and smoothing unit 60c. The rectifying / smoothing unit 60c outputs a direct current to the comparator 46b by rectifying and smoothing the signal (alternating current) from the signal amplifying unit 60b. The comparator 46b detects the reception of the wake signal based on the signal (alternating current) from the signal amplifier 60b, and controls both timers 48a and 48b as in the above embodiment. Therefore, even if it is a case where the non-contact charging device 40 and the vehicle-mounted apparatus 20 are comprised separately, the effect similar to the said embodiment is obtained.

  In the above embodiment, the connection between the harness 25 and the interference suppression unit 43 and between the interference suppression unit 43 and the LF transmission antenna 23a are not limited to connector connection. For example, connection by soldering may be used.

  In the above embodiment, the interference suppression unit 43 employs the sensor 44 as a sensor (for example, a transformer) that senses the alternating current supplied to the LF transmission antenna 23a by electromagnetic induction. May be. For example, there is a current probe for detecting an alternating current by electromagnetic induction. If a current probe is used, indirect sensing is possible. Further, instead of electromagnetic induction, for example, a shunt resistor may be employed to convert an alternating current into a voltage and sense the presence or absence of a signal.

  In the above-described embodiment, the electromagnetic wave from the non-contact charging device 40 is blocked by turning off the FET 49 that is the power feeding suppression element. However, the configuration is not limited to the above as long as the electromagnetic wave from the non-contact charging device 40 can be blocked. For example, the power supply of the entire contactless charging device 40 may be turned off. According to this configuration, the electromagnetic waves from the non-contact charging device 40 can be blocked more easily.

  Further, for example, a relay circuit may be provided between the excitation circuit 42 and the primary coil L1. This relay circuit has first to third terminals. The first terminal is connected to the excitation circuit 42, the second terminal is connected to the primary coil L1, and the third terminal is connected to the ground. When the movable contact is displaced between the second and third terminals, the primary coil L1 is connected to either the excitation circuit 42 or the ground. When the interference suppression unit 43 determines that the voltage value is equal to or greater than the threshold value, the interference suppression unit 43 connects the primary coil L1 to the ground through a relay circuit for a certain period of time. Thereby, the electromagnetic waves from the non-contact charging device 40 are blocked.

  Moreover, you may suppress the electromagnetic waves from the primary coil L1 by increasing the impedance of the antenna system containing the primary coil L1. Specifically, a matching circuit is provided between the excitation circuit 42 and the primary coil L1. The matching circuit matches the impedance between the primary coil L1 and the power path, thereby suppressing the reflection loss of the electric energy of the antenna system including the primary coil L1. When the interference suppression unit 43 determines that the voltage value is equal to or greater than the threshold value, the interference suppression unit 43 increases the impedance of the antenna system through the matching circuit over a certain period of time. Thereby, the alternating current supplied to the primary coil L1 decreases, and as a result, the electromagnetic waves from the primary coil L1 can be suppressed.

  In the above embodiment, when a wake signal is transmitted from the LF transmission antenna 23a into the vehicle, electromagnetic waves from the non-contact charging device 40 are suppressed. However, electromagnetic waves from the non-contact charging device 40 may also be suppressed when a radio signal is transmitted from a transmission antenna provided outside the vehicle (for example, inside the door handle). For example, in the case of event verification, when the lock switch provided on the door handle outside the vehicle is operated, the in-vehicle device 20 transmits a wake signal to the outside of the vehicle. And the vehicle-mounted apparatus 20 switches the locking / unlocking state of a vehicle door, when collation is materialized by a series of communication with the electronic key 10 through the wake signal. In the case of prior verification, the in-vehicle device 20 transmits a wake signal to the outside of the vehicle at regular intervals, and performs verification through a series of communications with the electronic key 10 when the electronic key 10 is located around the vehicle. The in-vehicle device 20 switches the locking / unlocking state of the vehicle door when the lock switch is operated in a state where this verification is established.

In the above embodiment, the non-contact charging device 40 is an electromagnetic induction type, but may be a magnetic resonance type.
In the above embodiment, the interference suppression unit 43 may be provided with a processing circuit for determining whether or not the alternating current supplied to the LF transmission antenna 23a is a wake signal, such as a decoder, a microcomputer, or a memory. .

  In the above embodiment, the longest communication time T3 when setting the power supply stop time Ts1 is used, but the series of communication time T3 when setting the power supply stop time Ts1 is not the longest. May be. For example, in a series of communications, the power supply stop time Ts1 may be set using the minimum communication time T3 when the number of transmissions of the wake signal, vehicle signal, and challenge signal is one each.

  L1 ... primary coil, L2 ... secondary coil, 10 ... electronic key, 11 ... electronic key control unit, 12 ... LF reception unit, 12a ... LF reception antenna, 13 ... UHF transmission unit, 13a ... transmission antenna, 20 ... in-vehicle Equipment: 21 ... ECU, 23 ... LF transmitter, 23a ... LF transmitter antenna, 23b, 47a ... first connector, 24 ... UHF receiver, 24a ... UHF receiver antenna, 25 ... harness, 25a, 47b ... second Connector, 33 ... Engine switch, 34 ... Courtesy switch, 40 ... Non-contact charging device, 41 ... Charge control device, 42 ... Excitation circuit, 43 ... Interference suppression unit as detection means and power feeding suppression means, 44 ... Sensor, 45 ... Processing circuit 46b ... Comparator 47 ... Substrate 48a ... First timer 48b ... Second timer 49 ... FET 50 ... Portable terminal.

Claims (3)

It is provided in a vehicle having an in-vehicle device that authenticates whether or not it is a legitimate electronic key through a series of communications with the electronic key, and is supplied to the primary coil by supplying an alternating current to the non-charged device. In a non-contact charging device that transmits power by contact,
Detecting means for detecting the start of a series of communications between the in-vehicle device and the electronic key;
When the start of a series of communications is detected through the detection means, the first power supply suppression time set based on the time required for the series of communications and the second power supply starting from when the first power supply suppression time has elapsed When the alternating current supplied to the primary coil is suppressed over the power supply suppression time and the start of a new series of communications is detected through the detection means during the elapse of the second power supply suppression time, A non-contact charging apparatus comprising: a power supply suppression unit that extends a power supply suppression time until after a new series of communication ends. The contactless charging device according to claim 1,
The in-vehicle device wirelessly transmits a wake signal over a plurality of times every first time until there is a response from the electronic key, and when there is a response, the vehicle-mounted device is authorized through a series of communications with the electronic key. Authenticating whether the electronic key is
The detection means detects the start of a series of communications between the in-vehicle device and the electronic key through detection of the wake signal,
The first power supply suppression time is from when the start of the series of communications is detected by detecting the first wake signal through the detection means to when the series of communications triggered by the second wake signal is completed. Non-contact charging device set based on the time of. In the non-contact charging device according to claim 2,
The in-vehicle device, after authenticating that the electronic key is genuine through a series of communications with the electronic key, the electronic key through a series of communications with the electronic key multiple times every second time. Authenticate
The power feeding suppression means is
A power supply suppressing element that is provided in a current supply path to the primary coil and that suppresses a supply current to the primary coil based on a command signal for suppressing power supply;
First and second timers for outputting the command signal to the power supply suppression element over the first and second power supply suppression times;
Timer control means for controlling the first and second timers,
The timer control means outputs the command signal to the power supply suppression element over the first power supply suppression time through the first timer from when the wake signal is detected through the detection means, The detection means outputs the command signal to the power supply suppression element over the second power supply suppression time through the second timer from when the power supply suppression time has elapsed, and the detection means during the passage of the second power supply suppression time When the wake signal is detected through the non-contact charging device, the second timer is reset, and the command signal is output to the power feeding suppression element again through the first timer for the first power feeding suppression time. .