JP2013115939A - Non contact power transmission apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non contact power transmission apparatus which allows a user to grasp abnormality of one device with the other device in a primary side device and a secondary side device.SOLUTION: A non contact power transmission apparatus 10 includes: a ground side device 11 provided on the ground; and a vehicle side device 21 mounted on a vehicle. The ground side device 11 is provided with a high frequency power source 12, a primary side coil 13a, and a ground side controller 15 controlling the ground side device 11. The vehicle side device 21 is provided with a secondary side coil 23a which receives alternating current power from the primary side coil 13a and a vehicle side controller 26 controlling the vehicle side device 21. The respective controllers 15, 26 are communicable through two systems, i.e., a first communication system and a second communication system. When abnormality occurs in the vehicle side device 21, abnormality information is sent to the ground side controller 15 by the second communication system.

Description

  The present invention relates to a non-contact power transmission apparatus.

  2. Description of the Related Art Conventionally, a non-contact power transmission device that performs power transmission in a non-contact manner from a primary device having a power source to a secondary device as a power receiving device without using a power cord or a power transmission cable is known. For example, as shown in Patent Document 1, a system that controls power transmission by connecting a primary side device and a secondary side device via a power supply line and a communication line and exchanging information using the communication line. It has been known.

JP 2008-182858 A

  When an abnormality occurs in one device in the primary device and the secondary device, there is a case where it is desired to grasp the abnormality early in the other device. At this time, if an abnormality occurs in the communication line, the other device cannot grasp the abnormality of one device. For this reason, there is a possibility that power transmission is performed in a state where there is an abnormality, or the other device is adversely affected.

  An object of the present invention is made in view of the above-described circumstances, and in a primary side device and a secondary side device, a non-contact power transmission apparatus capable of grasping an abnormality of one device by the other device. Is to provide.

  In order to achieve the above object, the invention described in claim 1 is a primary side device having an AC power source that outputs AC power, and a secondary that can receive the AC power from the primary side device in a contactless manner. In the non-contact power transmission device including the side device, the primary side device controls the primary side coil to which the AC power is input from the AC power source and the primary side device. And a secondary side coil capable of receiving the AC power from the primary side coil, and a secondary side control unit that controls the secondary side device. Communication is performed between the secondary side control means and the secondary side control means, and is used to exchange information relating to power transmission between the primary side control means and the secondary side control means. When an abnormality occurs in one communication means and the primary device A first abnormality communication unit for transmitting abnormality information from the primary side control means to the secondary side control means, and when the abnormality occurs in the secondary side device, from the secondary side control means to the first And second communication means having at least one of second abnormality communication units for transmitting abnormality information to the secondary control means.

  According to this invention, for example, when the second communication unit has the second abnormality communication unit, when abnormality occurs in the secondary side device, the abnormality information is transmitted to the primary side control unit. . As a result, even if there is an abnormality in the first communication means used for exchanging information related to power transmission, the secondary-side device in the primary-side control means is abnormal. I can grasp it. Therefore, even when the first communication unit is abnormal, the primary side control unit can perform processing corresponding to the abnormality of the secondary side device, which is suitable for the abnormality of the secondary side device. It can correspond to. Note that the first abnormality communication unit also has the same operational effects except that the primary device and the secondary device are reversed.

  According to a second aspect of the present invention, the first communication unit is provided in the primary side device, and can communicate with the primary side control unit via a first communication path. It is provided in the secondary side device, can communicate with the primary side communication unit via the second communication path, and can communicate with the secondary side control means via the third communication path. A secondary communication unit, wherein the second communication unit includes at least the second abnormal communication unit, and the second abnormal communication unit is configured to perform the secondary communication when an abnormality occurs in the third communication path. The abnormality information is transmitted from the side control means to the primary side control means.

  According to this invention, when an abnormality occurs in the third communication path, the abnormality information is transmitted to the primary side control means by the second communication means. Thereby, the primary side control means can grasp the abnormality of the third communication path in the secondary side device.

  Here, since the third communication path is not directly connected to the primary side control means, an abnormality in the third communication path is difficult to be grasped by the primary side control means. Further, when an abnormality occurs in the secondary side communication unit or an abnormality occurs in the third communication path, the abnormality information is transmitted from the secondary side control means to the primary side control means using the first communication means. I can't. In this regard, according to the above-described invention, since the second abnormality communication unit is provided, the abnormality in the third communication path can be grasped by the primary side control means, which is suitable for the abnormality in the third communication path. It can correspond to.

  According to a third aspect of the present invention, the secondary device includes a rectifying unit that rectifies AC power received by the secondary coil into DC power, and a load to which the DC power is input. The second communication unit includes at least the second abnormality communication unit, and the primary control unit reduces or stops the output of the AC power when the abnormality information is received by the second abnormality communication unit. The AC power supply is controlled so as to be controlled.

  When an abnormality occurs in the secondary side device such as an abnormality in the rectifying unit or load, the input impedance viewed from the output of the AC power supply may change. In this case, the reflected power to the AC power supply increases and the burden on the AC power supply increases.

  On the other hand, according to the present invention, when an abnormality occurs in the secondary side device, abnormality information is transmitted from the secondary side control means to the primary side control means, and the output of AC power is reduced or stopped. To do. Thereby, the reflected power to the AC power supply is reduced. Thus, the burden on the AC power supply can be reduced.

  According to this invention, in the primary side device and the secondary side device, an abnormality of one device can be grasped by the other device.

The block diagram which shows the electrical constitution of the non-contact electric power transmission apparatus which concerns on this invention.

Hereinafter, an embodiment of a non-contact power transmission apparatus embodying the present invention will be described with reference to FIG.
As shown in FIG. 1, the non-contact power transmission apparatus 10 includes a ground side device 11 provided on the ground and a vehicle side device 21 mounted on the vehicle. The ground side device 11 corresponds to a primary side (power feeding side) device, and the vehicle side device 21 corresponds to a secondary side (power receiving side) device.

  The ground side device 11 includes a high frequency power source 12 (AC power source) capable of outputting predetermined high frequency power as AC power. The high-frequency power source 12 is configured to convert the power input from the system power source E as the infrastructure into high-frequency power and to output the converted high-frequency power.

  The ground-side device 11 includes a power transmitter 13 to which high-frequency power is input from a high-frequency power source 12 through a matching unit 14. The vehicle-side device 21 includes a battery 22 and a power receiver 23 that can receive high-frequency power from the power transmitter 13.

  The power transmitter 13 and the power receiver 23 are configured to be capable of magnetic field resonance. The power transmitter 13 is composed of a resonant circuit including a primary coil 13a and a primary capacitor 13b connected in parallel. The power receiver 23 is composed of a resonance circuit including a secondary coil 23a and a secondary capacitor 23b connected in parallel. Both resonance frequencies are set to be the same.

  The vehicle side device 21 is provided with a rectifier 24 (rectifying unit). The rectifier 24 rectifies the high frequency power received by the power receiver 23 into DC power. The battery 22 is electrically connected to the rectifier 24 via the relay 25, and DC power is input to the battery 22 when the relay 25 is on.

  The matching unit 14 provided between the high-frequency power source 12 and the power transmitter 13 is composed of one matching coil 14a and two variable capacitors 14b. The matching unit 14 performs impedance matching by changing the capacitance of the variable capacitor 14b according to the input impedance from the output of the high-frequency power source 12 to the battery 22. However, the present invention is not limited to this, and the specific configuration of the matching unit 14 is arbitrary as long as impedance matching is possible. For example, a configuration including a variable coil may be adopted.

  The ground side device 11 is provided with a ground side controller 15 that controls the ground side device 11. The ground-side controller 15 confirms the state of the power transmitter 13 and confirms and controls the states of the high-frequency power source 12 and the matching unit 14. Specifically, the ground-side controller 15 performs on / off control of the output of the high-frequency power and variable control of the magnitude thereof, and also performs variable control of the capacitance in the variable capacitor 14b of the matching unit 14. The high frequency power supply 12, the matching unit 14, and the power transmission unit 13 are configured to output a signal for notifying the abnormality to the ground-side controller 15 when an abnormality occurs in itself. For this reason, the ground-side controller 15 can detect an abnormality in the high-frequency power source 12, the matching unit 14, and the power transmitter 13.

  The vehicle-side device 21 is provided with a vehicle-side controller 26 that controls the vehicle-side device 21. The vehicle-side controller 26 confirms the state of the power receiver 23 and confirms and controls the states of the rectifier 24, the relay 25, and the battery 22. Specifically, the vehicle-side controller 26 grasps the power storage status of the battery 22, performs on / off control of the relay 25 according to the power storage status, and turns on / off the relay 25 according to the operation status of the power receiver 23 and the rectifier 24. Take control. Further, the power receiver 23, the rectifier 24, and the battery 22 are provided with a monitoring circuit that monitors their own abnormality, and when an abnormality occurs in itself, a signal for notifying the abnormality is output to the vehicle-side controller 26. Has been. For this reason, the vehicle-side controller 26 can detect an abnormality in the power receiver 23, the rectifier 24, and the battery 22.

Each of the controllers 15 and 26 includes two communication systems, and is configured so that information can be exchanged individually in each communication system.
First, the first communication system (first communication means) will be described. The first wireless communication device 16 (primary communication unit) is electrically connected to the ground controller 11 by wire to the ground device 11. Is provided. The vehicle-side device 21 is provided with a second wireless communication device 27 (secondary communication unit) capable of wireless communication with the first wireless communication device 16. The second wireless communication device 27 is electrically connected to the vehicle-side controller 26 by wire.

  In the following description, communication between the ground controller 15 and the first wireless communication device 16 is communication 1 (first communication path), and communication between the first wireless communication device 16 and the second wireless communication device 27 is performed. 2 (second communication path) and communication between the vehicle-side controller 26 and the second wireless communication device 27 is referred to as communication 3 (third communication path). That is, the ground-side controller 15 and the vehicle-side controller 26 can exchange information via communication 1 to communication 3.

  The vehicle-side controller 26 is provided when the vehicle is arranged at a chargeable position, specifically, at a position where the power transmitter 13 (primary side coil 13a) and the power receiver 23 (secondary side coil 23a) can magnetically resonate. The relay 25 is turned on, and a chargeable signal is transmitted to the ground-side controller 15. Then, a chargeable signal is transmitted to the ground side controller 15 via communication 3-> communication 2-> communication 1. When the chargeable signal is received, the ground-side controller 15 performs impedance matching using the matching unit 14, and then controls the high-frequency power source 12 so that high-frequency power is output. As a result, the power transmitter 13 (primary coil 13 a) and the power receiver 23 (secondary coil 23 a) magnetically resonate, and high frequency power is transmitted to the power receiver 23. That is, the power receiver 23 receives high frequency power from the power transmitter 13. The received high frequency power is rectified by the rectifier 24 and input to the battery 22. Thereby, the battery 22 is charged.

  Thereafter, when the charging of the battery 22 is completed (terminated), the vehicle-side controller 26 transmits a charging completion signal (charging end signal). The charge completion signal is transmitted to the ground-side controller 15 via communication 3 → communication 2 → communication 1. When the ground-side controller 15 receives the charging completion signal, the ground-side controller 15 controls the high-frequency power supply 12 to stop the output of the high-frequency power and transmits a relay-off signal. The relay-off signal is transmitted to the vehicle-side controller 26 via communication 1 → communication 2 → communication 3. The vehicle-side controller 26 turns off the relay 25 based on the reception of the relay-off signal. Thus, a series of operations related to charging is completed. A chargeable signal, a charge completion signal, and the like correspond to information related to power transmission.

  The timing for turning off the relay 25 is not limited to the reception timing of the relay off signal. For example, a time longer than the time required to stop the output of the high-frequency power may be counted from the timing at which the charging completion signal is transmitted, and the relay 25 may be turned off at the timing when the counting is completed. In this case, there is no need to exchange relay-off signals.

  Next, the second communication system (second communication means) will be described. The ground side device 11 is provided with a third wireless communication device 17 electrically connected to the ground side controller 15 by wire. The vehicle-side device 21 is provided with a fourth wireless communication device 28 capable of wireless communication with the third wireless communication device 17. The fourth wireless communication device 28 is electrically connected to the vehicle-side controller 26 by wire.

  In the following description, the communication between the ground-side controller 15 and the third wireless communication device 17 is the communication 4, the communication between the third wireless communication device 17 and the fourth wireless communication device 28 is the communication 5, and the vehicle-side controller. Communication between 26 and the fourth wireless communication device 28 is referred to as communication 6. That is, the ground controller 15 and the vehicle controller 26 can exchange information via the communication 4 to the communication 6.

  Here, the first communication system and the second communication system are independent of each other. Specifically, the wiring of communication 1 and the wiring of communication 4 are provided independently, and the wiring of communication 3 and the wiring of communication 6 are provided independently. Thereby, even if an abnormality occurs in the first communication system, the second communication system is hardly affected.

  The first communication system is configured to detect whether or not an abnormality has occurred in communication 1 to communication 3 at a predetermined frequency. This will be described in detail below. In addition, since the configuration related to the abnormality detection of each of the communication 1 to communication 3 is basically the same, the configuration related to the abnormality detection of the communication 3 is basically described, and the description of the communication 1 and the communication 2 is omitted. To do.

  The communication protocol of both the vehicle-side controller 26 and the second wireless communication device 27 is equipped with an acknowledge (ACK) function. Specifically, in the vehicle-side controller 26 and the second wireless communication device 27, information is transmitted from the transmitting side to the receiving side, and if the information is correctly received on the receiving side, an acknowledge (ACK ) Transmit the signal from the receiving side to the transmitting side. Thereby, when the acknowledge signal is not received on the transmission side, it can be determined whether or not the communication state between the two is normal by determining that an abnormality has occurred.

  In addition, the vehicle-side controller 26 and the second wireless communication device 27 are configured to perform regular communication at a predetermined cycle. In this case, it is determined that an abnormality has occurred when a signal related to regular communication is not received despite the timing for performing regular communication.

From the above, the abnormality of the communication 3 can be detected in both the vehicle-side controller 26 and the second wireless communication device 27.
When an abnormality occurs in the communication 2, the first wireless communication device 16 transmits the abnormality information of the communication 2 to the ground-side controller 15 via the communication 1, and the second wireless communication device 27 transmits the communication 3. Then, the abnormality information of communication 2 is transmitted to the vehicle-side controller 26. Thereby, it is possible to detect that an abnormality has occurred in the communication 2 in each of the controllers 15 and 26.

Next, control when an abnormality occurs in the vehicle-side device 21 will be described.
As already described, the vehicle-side controller 26 can detect an abnormality in the power receiver 23, the rectifier 24, the relay 25, and the battery 22, and can detect an abnormality in the communication 2 and the communication 3. The vehicle-side controller 26 immediately turns off the relay 25 when any of these abnormalities is detected during charging of the battery 22, and uses the second communication system to control the ground-side controller. 15, the abnormality information indicating that an abnormality has occurred in the vehicle-side device 21 is transmitted. Specifically, the vehicle-side controller 26 transmits abnormality information to the ground-side controller 15 via communication 6 → communication 5 → communication 4. The ground-side controller 15 controls the high frequency power supply 12 so that the output of the high frequency power is stopped when the abnormality information is received.

  Further, when an abnormality occurs in the communication 3, the vehicle-side controller 26 transmits the abnormality information of the communication 3 using the second communication system. Then, the second wireless communication device 27 transmits the abnormality information of the communication 3 to the first wireless communication device 16 via the communication 2, and the first wireless communication device 16 communicates to the ground-side controller 15 via the communication 1. 3 abnormal information is transmitted. The ground-side controller 15 determines that the communication 3 is abnormal when the abnormality information of the communication 3 is received from both the communication 1 and the communication 4.

Next, the operation of the non-contact power transmission apparatus 10 of this embodiment will be described.
When an abnormality occurs in the vehicle-side device 21 during charging of the battery 22, that is, in a situation where high-frequency power is being output from the high-frequency power source 12, the relay 25 is turned off and the abnormality information uses the second communication system. To the ground controller 15. Then, the output of the high frequency power is stopped based on the abnormality information received by the ground controller 15. As a result, the state in which high-frequency power is being output in a situation where an abnormality has occurred in the vehicle-side device 21 is not continued. Therefore, a state in which a load is applied to the high-frequency power source 12 is not continued.

  Specifically, impedance matching is performed by the matching unit 14 at the start of charging. In this case, the input impedance to be subjected to impedance matching includes the impedance of each component from the output of the high frequency power supply 12 to the battery 22. When the relay 25 is turned off in the situation where the impedance matching is performed, the input impedance changes by an amount corresponding to the impedance of the battery 22. For this reason, impedance matching cannot be achieved, and the reflected power increases. Therefore, the burden on the high frequency power supply 12 is increased. On the other hand, since the output of the high-frequency power is stopped immediately after the relay 25 is turned off, the output state of the high-frequency power in the state where the reflected power is large is not continued for a long time.

  Further, even if an abnormality of the second wireless communication device 27 or an abnormality of the communication 3 occurs in the vehicle-side device 21, the abnormality information is transmitted to the ground-side controller 15 using the second communication system. Sent to. As a result, the ground-side controller 15 can grasp the abnormality of the vehicle-side device 21 regardless of the abnormality of the first communication system.

  In particular, when an abnormality occurs in the communication 3, the abnormality information of the communication 3 is transmitted to the ground side controller 15 using the second communication system, and the abnormality information of the communication 3 is transmitted via the communication 2 → communication 1. Sent. When the abnormality information of the communication 3 is received from both the communication 1 and the communication 4 to the ground controller 15, it is determined that the communication 3 is abnormal.

According to the embodiment described in detail above, the following excellent effects are obtained.
(1) When abnormality occurs in the vehicle-side device 21, the abnormality information for notifying the abnormality is transmitted to the ground-side controller 15 through the second communication system (communications 4 to 6). . Thereby, even if an abnormality occurs in the first communication system (communications 1 to 3), the ground-side controller 15 can grasp the abnormality of the vehicle-side device 21. Therefore, regardless of the state of the first communication system, the ground-side controller 15 can execute processing corresponding to the abnormality of the vehicle-side device 21.

  In particular, when an abnormality of the communication 3 or an abnormality of the second wireless communication device 27 occurs as an abnormality of the vehicle side device 21, the abnormality of the vehicle side device 21 cannot be transmitted to the ground side controller 15. On the other hand, according to the present embodiment, even if an abnormality occurs in the second wireless communication device 27 or the communication 3, the abnormality of the vehicle side device 21 is detected using the second communication system. 15 can tell. As a result, even if an abnormality occurs in the second wireless communication device 27 or the communication 3, the ground-side controller 15 can grasp the abnormality of the vehicle-side device 21 at an early stage, and the abnormality of the vehicle-side device 21 Can be handled early.

  (2) When an abnormality occurs in the communication 3, the abnormality information of the communication 3 is transmitted to the ground-side controller 15 using the second communication system. Thereby, in the ground side controller 15, it can grasp | ascertain that abnormality has generate | occur | produced in the communication 3 which is a communication path in the vehicle side apparatus 21 in a 1st communication system.

  In particular, the communication 3 is a communication path in the vehicle-side device 21 and is not directly connected to the ground-side controller 15. For this reason, it is assumed that the abnormality of the communication 3 is not easily grasped by the ground side controller 15, and even if it can be grasped, it takes a predetermined time to grasp. Further, when an abnormality occurs in the communication 3, the abnormality information cannot be transmitted from the vehicle-side controller 26 to the ground-side controller 15 using the first communication system.

  On the other hand, according to the present embodiment, by transmitting the abnormality information of the communication 3 using the second communication system, the ground-side controller 15 can grasp the abnormality of the communication 3, and the communication 3 It is possible to cope with such abnormalities.

  (3) When an abnormality occurs in the vehicle-side device 21 while the battery 22 is being charged, the relay 25 is turned off and the abnormality information is transmitted to the ground-side controller 15. And the ground side controller 15 was set as the structure which controls the high frequency power supply 12 so that the output of high frequency electric power may be stopped, when abnormality information is received. Thereby, when the relay 25 is turned off, the output of the high frequency power of the high frequency power supply 12 is immediately stopped. Therefore, even if the input impedance from the output of the high frequency power supply 12 to the battery 22 changes due to the occurrence of an abnormality in the vehicle side device 21 (the relay 25 is turned off), the connection to the high frequency power supply 12 Reflected power is reduced. Therefore, the burden on the high frequency power supply 12 can be reduced.

  (4) When an abnormality occurs in the communication 3, the second wireless communication device 27 transmits the abnormality information of the communication 3 to the first wireless communication device 16 via the communication 2, and the first wireless communication device 16 Is configured to transmit the abnormality information to the ground-side controller 15 via the communication 1. As a result, the ground controller 15 receives the abnormality information of the communication 3 from both the communication 1 and the communication 4. Therefore, the ground controller 15 can suppress erroneous detection of the communication 3 abnormality by determining the communication 3 abnormality based on receiving the communication 3 abnormality information from both the communication 1 and the communication 4. .

In addition, you may change the said embodiment as follows.
In the embodiment, when abnormality occurs in the vehicle-side device 21, the configuration is such that the abnormality information is transmitted to the ground-side controller 15 using the second communication system. When an abnormality occurs at, abnormal information indicating that an abnormality has occurred in the ground-side device 11 may be transmitted to the vehicle-side controller 26 using the second communication system. Specifically, as described in the embodiment, the ground-side controller 15 can detect abnormalities in the high-frequency power source 12, the matching unit 14, and the power transmitter 13, and can detect abnormalities in the communication 1 and the communication 2. Can do. Then, if any of these abnormalities is detected during charging of the battery 22, the ground-side controller 15 stops the output of the high-frequency power and outputs abnormality information using the second communication system. It transmits to the vehicle side controller 26. Further, when an abnormality occurs in communication 1, first wireless communication device 16 transmits abnormality information of communication 1 to second wireless communication device 27 via communication 2, and second wireless communication device 27 communicates. 3, the abnormality information of communication 1 is transmitted to the vehicle-side controller 26. And the vehicle side controller 26 turns OFF the relay 25, when abnormality information is received. Thereby, it is possible to prevent the state in which the DC power flows backward by continuing the relay 25 in the state where the output of the high-frequency power is stopped.

  In short, the function (first abnormality communication unit) that transmits the abnormality of the ground side device 11 to the vehicle side controller 26 using the second communication system and the abnormality of the vehicle side device 21 using the second communication system are grounded. What is necessary is just to provide at least one with the function (2nd abnormality communication part) to tell the side controller 15. However, as described above, it is preferable that the period between the timing when the relay 25 is turned off and the output stop timing of the high-frequency power is as short as possible. If attention is paid to this point, it is better to have at least a function of transmitting the abnormality of the vehicle side device 21 to the ground side controller 15 so that the abnormality can be grasped early regardless of the abnormality of the first communication system. Good.

  If the abnormal information transmitted from the vehicle-side controller 26 can be grasped by the ground-side controller 15, the specific data configuration is arbitrary. In addition, in the configuration in which the abnormality information is bidirectionally communicated between the controllers 15 and 26 as described above, common abnormality information may be used between the two controllers, or the ground side controller 15 may transmit to the vehicle side controller 26. The data configuration may be different between the transmitted abnormality information and the abnormal information transmitted from the vehicle-side controller 26 to the ground-side controller 15.

  In the embodiment, the ground-side controller 15 is configured to control the high-frequency power source 12 so as to stop the output of the high-frequency power when the abnormality information is received while the battery 22 is being charged. For example, the high frequency power may be reduced. Even in this case, the burden on the high frequency power supply 12 can be reduced.

  ○ In order to detect abnormalities in communication 1 to communication 3, an acknowledge function and a function to perform regular communication are provided. However, the present invention is not limited to this, and a specific configuration is optional as long as an abnormality can be detected. is there.

  ○ As an abnormality of the ground side device 11, for example, when the high frequency power output from the high frequency power supply 12 is out of a predetermined allowable range, or when the current flowing through the power transmitter 13 is out of the predetermined allowable range When the transmission efficiency is lower than a predetermined threshold, the temperature of the power transmitter 13 may be outside the allowable range. Moreover, as abnormality of the vehicle side apparatus 21, when the alternating current power received with the power receiver 23 is lower than a threshold value, for example, when the temperature of the battery 22 becomes larger than a threshold value, the power loss in the rectifier 24 is more than a threshold value. May be large. In short, a state where trouble may occur in power transmission is regarded as abnormal.

  In the embodiment, when an abnormality occurs in the communication 3, the abnormality information of the communication 3 is transmitted by two systems of the second communication system (communication 6 → communication 5 → communication 4) and communication 2 → communication 1. Although it was set as the structure, it is not restricted to this, It is good also as a structure which does not transmit the abnormality information of the communication 3 via the communication 2-> communication 1. FIG.

  In the embodiment, the communication 3 and the communication 6 are made independent by separating the wiring related to the communication 3 and the wiring related to the communication 6. However, the present invention is not limited to this, and a part may be shared. Thereby, simplification of a structure can be achieved. However, considering the influence on the other when an abnormality occurs in one, it is preferable that both are provided independently. The same applies to communication 1 and communication 4.

  In the embodiment, when an abnormality occurs in the vehicle-side device 21, the abnormality information is uniformly transmitted using the second communication system. However, the present invention is not limited to this. For example, when an abnormality occurs in a device other than the first communication system in the vehicle-side device 21 in a situation where the first communication system is normal (communicable), the first communication system (and the second communication system). ) Is used to transmit the abnormality information, and when an abnormality occurs in the first communication system, the abnormality information may be transmitted using the second communication system.

  In addition, when an abnormality occurs in the first communication system, the information transmission system related to power transmission may be switched from the first communication system to the second communication system. In this case, power transmission can be performed even when an abnormality occurs in the first communication system.

  In the embodiment, when an abnormality occurs in the vehicle-side device 21, the output of the high-frequency power from the high-frequency power source 12 is stopped after turning off the relay 25, but is not limited thereto. For example, the relay 25 may be turned off after the output of the high-frequency power from the high-frequency power source 12 is stopped. Specifically, when an abnormality occurs in the vehicle-side device 21, the vehicle-side controller 26 transmits abnormality information while maintaining the relay 25 on. The ground side controller 15 stops the output of the high frequency power based on the reception of the abnormality information, and transmits a relay-off signal. Then, the vehicle-side controller 26 turns off the relay 25 based on the reception of the relay-off signal. In this case, it is possible to avoid a situation in which the reflected power to the high-frequency power source 12 increases due to the change in input impedance when the relay 25 is turned off, so that the reflected power to the high-frequency power source 12 is further reduced. Can be planned.

  In the embodiment, when an abnormality occurs in the vehicle-side device 21, the input impedance is changed by turning off the relay 25. However, the present invention is not limited to this. For example, the input impedance from the output of the high-frequency power source 12 to the battery 22 also changes when a path related to power transmission is disconnected or when an abnormality occurs in a device on the path, such as the rectifier 24 or the battery 22. That is, when an abnormality occurs in the vehicle-side device 21, the input impedance may change.

  In such a configuration, according to the embodiment, the increase in the burden on the high-frequency power source 12 based on the abnormality of the vehicle-side device 21 is suppressed by synchronizing the timing at which the relay 25 is turned off and the output stop timing of the high-frequency power. can do.

  In the embodiment, the matching unit 14 is provided in the ground device 11, but is not limited thereto, and may be provided in the vehicle device 21, and is provided in both the ground device 11 and the vehicle device 21. It may be. In short, the matching unit 14 may be provided in at least one of the ground side device 11 and the vehicle side device 21.

  In addition, the matching unit 14 may be omitted. In this case, the input impedance from the output of the high-frequency power source 12 to the battery 22 is known in advance, and the high-frequency power source 12 may be adjusted to match the input impedance. However, if attention is paid to the fact that the input impedance varies depending on the distance between the coils 13 a and 23 a and the state of storage of the battery 22, it is better to provide the matching unit 14.

  The power transmitter 13 may be separately provided with a primary coupling coil that is coupled with a resonance circuit including the primary coil 13a and the primary capacitor 13b by electromagnetic induction. In this case, the primary side coupling coil and the high frequency power source 12 are connected, and the resonance circuit is configured to receive high frequency power from the primary side coupling coil by electromagnetic induction. Similarly, the power receiver 23 is provided with a secondary side coupling coil that is coupled by electromagnetic induction to a resonance circuit including the secondary side coil 23a and the secondary side capacitor 23b, and the resonance of the power receiver 23 is performed using the secondary side coupling coil. Power may be extracted from the circuit.

O The waveform of the AC voltage output from the high-frequency power source 12 is arbitrary, such as a pulse waveform or a sine wave.
O Although the high frequency power supply 12 which outputs high frequency electric power was provided, it is not restricted to this. In short, any AC power source that outputs AC power of a predetermined frequency (for example, 10 kHz to 10 MHz) may be used, and the frequency of the output AC power may be appropriately set in relation to the resonance frequency or the like.

  In the embodiment, the capacitors 13b and 23b are provided, but these may be omitted. In this case, it is preferable to employ a configuration in which magnetic field resonance is performed using the parasitic capacitances of the coils 13a and 23a.

In the embodiment, magnetic field resonance is used in order to realize non-contact power transmission. However, the present invention is not limited to this, and electromagnetic induction may be used.
In the embodiment, the charging target is the battery 22 provided in the vehicle, but is not limited thereto, and may be a battery of a mobile phone, for example.

  In the embodiment, the DC power rectified by the rectifier 24 is used to charge the battery 22. However, the present invention is not limited to this, for example, to drive other electronic devices provided in the vehicle. It may be used.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) The secondary communication unit transmits the abnormality information to the primary communication unit via the second communication path when an abnormality occurs in the third communication path. The contactless power transmission device according to claim 2.

(B) the first communication means includes:
A primary side communication unit provided in the primary side device and capable of communicating with the primary side control means via a first communication path;
Provided in the secondary side device, capable of wireless communication with the primary side communication unit via a second communication path and communicating with the secondary side control means via a third communication path Possible secondary side communication part;
With
The second communication means includes at least the first abnormal communication unit,
The first abnormality communication unit is configured to transmit the abnormality information from the primary side control unit to the secondary side control unit when an abnormality occurs in the first communication path. The non-contact electric power transmission apparatus as described in any one of 1-3.

  (C) The primary side communication unit transmits the abnormality information to the secondary side communication unit via the second communication path when an abnormality occurs in the first communication path. A non-contact power transmission device according to the technical concept (b).

  (D) The first communication means includes means for periodically determining whether or not there is an abnormality in each of the communication paths, or technical ideas (a) to (c). The non-contact electric power transmission apparatus as described in any one of these.

  DESCRIPTION OF SYMBOLS 10 ... Non-contact electric power transmission apparatus, 11 ... Ground side apparatus, 12 ... High frequency power supply, 13a ... Primary side coil, 15 ... Ground side controller, 16 ... 1st wireless communication device, 17 ... 3rd wireless communication device, 21 ... Vehicle side device, 22 ... battery, 26 ... vehicle side controller, 27 ... second wireless communication device, 28 ... fourth wireless communication device.

Claims (3)

A primary side device having an AC power source for outputting AC power;
A secondary side device capable of receiving the AC power in a non-contact manner from the primary side device;
In a non-contact power transmission device comprising:
The primary device includes a primary coil to which the AC power is input from the AC power source, and primary control means for controlling the primary device,
The secondary device includes a secondary coil capable of receiving the AC power from the primary coil, and secondary control means for controlling the secondary device,
It communicates between the primary side control means and the secondary side control means, and is used for exchanging information related to power transmission between the primary side control means and the secondary side control means. First communication means,
When an abnormality occurs in the primary device, an abnormality occurs in the first abnormality communication unit that transmits abnormality information from the primary control unit to the secondary control unit, and in the secondary device A second communication unit having at least one of a second abnormal communication unit for transmitting abnormality information from the secondary side control unit to the primary side control unit when
A non-contact power transmission device comprising: The first communication means includes
A primary side communication unit provided in the primary side device and capable of communicating with the primary side control means via a first communication path;
Provided in the secondary side device, capable of wireless communication with the primary side communication unit via a second communication path and communicating with the secondary side control means via a third communication path Possible secondary side communication part;
With
The second communication means includes at least the second abnormal communication unit,
The said 2nd abnormality communication part transmits the said abnormality information to the said primary side control means from the said secondary side control means, when abnormality has generate | occur | produced in the said 3rd communication path | route. Non-contact power transmission device. The secondary device is
A rectifier that rectifies AC power received by the secondary coil into DC power;
A load to which the DC power is input;
With
The second communication means includes at least the second abnormal communication unit,
The said primary side control means controls the said alternating current power supply so that the output of the said alternating current power may be made small or stopped, when the said abnormality information is received by the said 2nd abnormality communication part. The non-contact electric power transmission apparatus of Claim 1 or Claim 2.