JP2013258873A - Non-contact power transmission system and charge/discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission system that allows a user to favorably know the amount of charge of a power storage device in a situation in which the power storage device automatically discharges, and to provide a charge/discharge device.SOLUTION: A non-contact power transmission system 10 includes: a ground-based device 11 that is provided on the ground; and a vehicle-based device 21 that is mounted on a vehicle. Magnetic field resonance between a primary resonator 13 provided in the ground-based device 11 and a secondary resonator 23 provided in the vehicle-based device 21 allows bidirectional non-contact power transmission between the ground-based device 11 and the vehicle-based device 21. In a situation in which an on-vehicle battery 25 automatically discharges, notification is made as to the amount of charge of the on-vehicle battery 25.

Description

  The present invention relates to a non-contact power transmission system and a charge / discharge device.

  Conventionally, as a non-contact power transmission system that does not use a power cord or a power transmission cable, for example, a system using magnetic field resonance is known. For example, the non-contact power transmission system of Patent Document 1 includes a primary device provided with an AC power source and a primary resonance coil to which AC power is input from the AC power source. The non-contact power transmission system includes a secondary side resonance coil capable of magnetic field resonance with a primary side resonance coil, and includes a secondary side device (charge / discharge device) mounted on the vehicle. Then, AC power is transmitted from the primary device to the secondary device due to magnetic field resonance between the primary resonance coil and the secondary resonance coil. The AC power is used for charging a vehicle-mounted battery provided in the secondary device.

JP 2009-106136 A

  Here, there is a case where the vehicle is required to be used as a power source, for example, an electric device other than the vehicle is driven using an in-vehicle battery. In order to meet this requirement, a non-contact power transmission system capable of transmitting electric power related to the discharge of the in-vehicle battery from the vehicle to the primary device, that is, between the primary device and the secondary device (vehicle). A contactless power transmission system capable of bidirectional power transmission is conceivable.

  In the non-contact power transmission system as described above, it may be possible to improve convenience by automatically determining charging / discharging of the in-vehicle battery according to, for example, lifestyle. In this case, for example, it is conceivable that the discharge of the in-vehicle battery is automatically terminated according to the charge amount of the in-vehicle battery. However, in a special situation such as an emergency, the user may want to perform direct discharge control. . In this case, the user may want to grasp the charge amount of the in-vehicle battery for the determination.

  The situation described above is not limited to the non-contact power transmission using magnetic field resonance, and the same applies to the case of using electromagnetic induction. In addition, the same applies to other devices in which the power storage device is mounted, without being limited to the vehicle in which the in-vehicle battery is mounted.

  The present invention has been made in view of the above-described circumstances, and in a non-contact power transmission system capable of charging and discharging a power storage device, the charge amount of the power storage device in a situation where the power storage device is automatically discharged. It is an object of the present invention to provide a non-contact power transmission system and a charge / discharge device that can appropriately grasp the above.

  In order to achieve the above object, the invention according to claim 1 is capable of receiving the AC power in a non-contact manner from the primary side device having a primary side coil to which AC power is input and the primary side coil. A secondary side device having a secondary side coil and a power storage device that is charged by the AC power received by the secondary side coil, and the power discharged from the power storage device is transferred from the secondary side device to the secondary side device. A non-contact power transmission system capable of transmitting to a primary device, wherein a notification regarding a charge amount of the power storage device is performed in a situation where the power storage device is automatically discharged.

  According to this invention, in a non-contact power transmission system capable of transmitting power without performing an operation of connecting a plug by a user, a notification regarding the charge amount of the power storage device when the power storage device is automatically discharged. Is done. Thus, the user can grasp the charge amount of the power storage device in a situation where the power storage device is automatically discharged. Therefore, in a special situation, the user can take measures according to the special situation based on the notification. Therefore, in the configuration in which the power storage device is discharged regardless of the user's operation (will), the user's will can be suitably reflected.

  The invention according to claim 2 is characterized in that the notification is performed when a charge amount of the power storage device becomes a predetermined specific charge amount in a state where the power storage device is discharged. To do. According to this invention, notification is performed when the charge amount of the power storage device becomes the specific charge amount. Thereby, it can be grasped that the charge amount of the power storage device has become the specific charge amount. Therefore, the user's will can be reflected with the specific charge amount as an opportunity.

  The invention according to claim 3 is provided with a selection means capable of manually selecting whether or not to perform the discharge when the notification is performed, and when the end of the discharge is selected by the selection means. Terminates the discharge. According to this invention, the user can manually select whether or not to perform discharge based on the notification. Thereby, it is possible to determine whether or not the user performs the discharge himself / herself in a situation where the discharge is automatically performed regardless of the operation of the user. Therefore, it is possible to achieve both the improvement of convenience by automatically discharging and the flexibility of controlling the discharge at the user's will.

  According to a fourth aspect of the present invention, a secondary coil that can receive the AC power in a non-contact manner from a primary device having a primary coil to which AC power is input, and the secondary coil receive power. A charging / discharging device capable of transmitting the electric power discharged from the power storage device to the primary device in a non-contact manner, and automatically discharging the power storage device. If the end of the discharge of the power storage device is instructed after the notification indicating that the charge amount of the power storage device has reached a predetermined specific charge amount in a situation where it is being performed, the discharge ends. It is characterized by doing.

  According to this invention, notification is performed when the charge amount of the power storage device becomes the specific charge amount. Thereby, it can be grasped that the charge amount of the power storage device has become the specific charge amount. Then, when the end of discharge is instructed thereafter, the discharge ends. Therefore, in the configuration in which the power storage device is discharged regardless of the user's operation (will), the user's will can be suitably reflected.

  According to the present invention, it is possible to appropriately grasp the charge amount of the power storage device in a situation where the power storage device is automatically discharged.

The block diagram of the non-contact electric power transmission system which concerns on this invention. The flowchart which shows the process in charge performed by the vehicle side controller.

An embodiment in which a non-contact power transmission system (non-contact power transmission device) according to the present invention is applied to a vehicle will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the non-contact power transmission system 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 the primary side device, and the vehicle side device 21 corresponds to the secondary side device.

  The non-contact power transmission system 10 includes a first power transmission path EL1 as a path for performing power transmission from the ground side device 11 to the vehicle side device 21, and a path for performing power transmission from the vehicle side device 21 to the ground side device 11. As a second power transmission path EL2.

  First, the configuration related to the first power transmission path EL1 will be described. The ground-side device 11 includes a primary-side high-frequency power source 12 (AC power source) that can output high-frequency power (AC power) having a predetermined frequency. The primary side high frequency power source 12 converts low frequency power input from a system power source as infrastructure into high frequency power.

  Specifically, the primary-side high-frequency power source 12 includes a rectifier that rectifies the low-frequency power of the system power source to DC power, and a DC / DC converter that has a switching element and converts DC power rectified by the rectifier. Yes. Further, the primary side high frequency power source 12 is constituted by a class D amplifier, and includes a DC / RF converter and a filter circuit for converting into high frequency power. That is, the primary side high frequency power supply 12 is a switching power supply that obtains high frequency power by the switching operation of the switching element, and its power efficiency is close to 100%.

The specific configuration of the primary side high frequency power supply 12 is not limited to this, and for example, a class E amplifier may be used instead of the class D amplifier.
The high-frequency power output from the primary-side high-frequency power source 12 is transmitted to the vehicle-side device 21 in a non-contact manner, and input to the secondary-side load 22 provided in the vehicle-side device 21. Specifically, the non-contact power transmission system 10 is configured to perform power transmission between the ground side device 11 and the vehicle side device 21, and the primary side resonator 13 (primary side resonance) provided in the ground side device 11. And a secondary side resonator 23 (secondary side resonator) provided in the vehicle-side device 21.

  The primary side resonator 13 and the secondary side resonator 23 have the same configuration, and both are configured to be capable of magnetic field resonance. Specifically, the primary side resonator 13 is comprised from the primary side coil 13a and the primary side capacitor | condenser 13b which were connected in parallel. The secondary side resonator 23 includes a secondary side coil 23a and a secondary side capacitor 23b connected in parallel. Both resonance frequencies are set to be the same.

  According to this configuration, when high frequency power is input to the primary side resonator 13, the primary side resonator 13 (primary side coil 13a) and the secondary side resonator 23 (secondary side coil 23a) are connected. Magnetic field resonance. As a result, the secondary resonator 23 receives a part of the energy of the primary resonator 13. That is, the secondary resonator 23 receives high frequency power from the primary resonator 13.

  The vehicle-side device 21 is provided with a secondary-side rectifier 24a that rectifies high-frequency power received by the secondary-side resonator 23 into DC power. The DC power rectified by the secondary rectifier 24 a is converted into a voltage suitable for charging by the secondary DC / DC converter 24 b provided in the vehicle-side device 21, and the power storage device provided in the vehicle-side device 21. Is input to the in-vehicle battery 25. Thereby, the vehicle-mounted battery 25 is charged. The secondary side rectifier 24 a, the secondary side DC / DC converter 24 b, the detection sensor 25 b, and the in-vehicle battery 25 constitute the secondary side load 22. The electric power charged in the in-vehicle battery 25 is used to drive a traveling motor (not shown) provided in the vehicle.

  Between the secondary side DC / DC converter 24b and the in-vehicle battery 25, a switch 25a for connecting or disconnecting the in-vehicle battery 25 and other devices and a detection sensor 25b for detecting the charging state of the in-vehicle battery 25 are provided. ing.

  As described above, the high frequency power output from the primary side high frequency power supply 12 is input to the secondary side load 22 via the primary side resonator 13 and the secondary side resonator 23. That is, it can be said that the first power transmission path EL1 is a path for transmitting the primary side high frequency power source 12 → the primary side resonator 13 → the secondary side resonator 23 → the secondary side load 22.

  Incidentally, if attention is paid to the fact that the first power transmission path EL1 is a path related to the charging of the in-vehicle battery 25, it can be said that the first power transmission path EL1 is the charging path EL1. In the case of performing power transmission using the charging path EL1, the primary side resonator 13 functions as a power transmitter, and the secondary side resonator 23 functions as a power receiver.

Next, a configuration related to the second power transmission path EL2 will be described.
The vehicle-side device 21 is provided with a converter 26 that converts DC power charged in the vehicle-mounted battery 25 into high-frequency power that can be transmitted by the resonators 13 and 23. The converter 26 is provided between the in-vehicle battery 25 (specifically, the switch 25a) and the secondary side resonator 23, and is parallel to the secondary side rectifier 24a and the secondary side DC / DC converter 24b. Is provided.

  The converter 26 converts the DC power voltage charged in the in-vehicle battery 25 into a voltage suitable for power transmission, and the DC power converted by the DC / DC converter 26a. A DC / RF converter 26b that converts the power into a high-frequency power having the same frequency as the resonance frequency of each of the resonators 13, 23 is provided.

  According to such a configuration, the DC power of the in-vehicle battery 25 is converted into high frequency power by the converter 26 and input to the secondary resonator 23. Then, the secondary-side resonator 23 and the primary-side resonator 13 perform magnetic field resonance, so that the primary-side resonator 13 receives high-frequency power from the secondary-side resonator 23.

  In addition, the ground side device 11 is provided with a primary side load 14 to which high frequency power received by the primary side resonator 13 is input. The primary side load 14 is provided between the primary side resonator 13 and the external load X, and is provided in parallel to the primary side high frequency power supply 12.

  The primary side load 14 includes a primary side rectifier 14a that rectifies the high-frequency power into DC power, and a primary side DC / DC converter 14b that converts the voltage of the DC power into a voltage having a predetermined magnitude. ing. The DC power converted by the primary side DC / DC converter 14b is input to the external load X. Thereby, it is possible to use the direct-current power of the vehicle-mounted battery 25 for purposes other than those related to the vehicle.

  As described above, the DC power of the in-vehicle battery 25 is transmitted to the primary load 14 via the converter 26, the secondary resonator 23, and the primary resonator 13, and is transmitted to the external load X. That is, the second power transmission path EL2 is connected to the secondary high-frequency power source 27 including the in-vehicle battery 25 and the converter 26 → the secondary resonator 23 → the primary resonator 13 → the primary load 14 (→ external load X). ).

  Incidentally, if attention is paid to the fact that the second power transmission path EL2 is a path related to the discharge of the in-vehicle battery 25, it can be said that the second power transmission path EL2 is the discharge path EL2. Further, in the case of performing power transmission using the discharge path EL2, the secondary side resonator 23 functions as a power transmitter, and the primary side resonator 13 functions as a power receiver.

  The non-contact power transmission system 10 includes a primary side relay 15 and a secondary side relay 28 as a pair of switching means for switching between the charging path EL1 and the discharging path EL2. The primary side relay 15 is provided in the ground side device 11 and switches the connection destination of the primary side resonator 13 to either the primary side high frequency power source 12 or the primary side load 14. The secondary side relay 28 is provided in the vehicle side device 21 and switches the connection destination of the secondary side resonator 23 to either the secondary side load 22 or the secondary side high frequency power source 27.

  According to this configuration, the primary side resonator 13 is connected to the primary side high frequency power source 12 by the primary side relay 15, and the secondary side resonator 23 is connected to the secondary side load 22 by the secondary side relay 28. The charging path EL1 is formed.

  On the other hand, when the primary side resonator 13 is connected to the primary side load 14 by the primary side relay 15, and the secondary side resonator 23 is connected to the secondary side high frequency power source 27 by the secondary side relay 28, A discharge path EL2 is formed.

  The ground side device 11 is provided with a power source side controller 16 for controlling the primary side high frequency power source 12 and the primary side relay 15. The vehicle-side device 21 is provided with a vehicle-side controller 29 that receives the detection result of the detection sensor 25b and controls the switch 25a and the secondary-side relay 28. Each controller 16 and 29 is configured to be capable of wireless communication. The controllers 16 and 29 can switch the power transmission path by controlling the relays 15 and 28 while exchanging information with each other. Thereby, switching of charging / discharging of the vehicle-mounted battery 25 is attained. The vehicle-side controller 29 can end (interrupt) the discharge of the in-vehicle battery 25 by turning off the switch 25a. Further, the power supply side controller 16 can terminate the charging of the in-vehicle battery 25 by controlling the primary high frequency power supply 12 so that the output of the high frequency power from the primary high frequency power supply 12 is stopped. In this case, the vehicle-side controller 29 turns off the switch 25a after the output of the high-frequency power from the primary-side high-frequency power source 12 is stopped.

  The vehicle-side device 21 is provided with an alarm sound generator 31 that can generate an alarm sound. The vehicle-side controller 29 is configured to be able to control the alarm sound generator 31 and can generate an alarm sound at a predetermined timing.

  Further, the vehicle-side device 21 is provided with an input unit 32 that can input information from the user. The input unit 32 is configured by a touch panel type input terminal, for example, and configured to be able to transmit input information to the vehicle-side controller 29. Thereby, the vehicle side controller 29 can grasp | ascertain the information input from the user in the input part 32. FIG. The input unit 32 and the vehicle-side controller 29 correspond to selection means.

  Here, a real-time clock (RTC) 29a is mounted on the vehicle-side controller 29, and the vehicle-side controller 29 is configured to be able to grasp the time. And the vehicle side controller 29 controls charge / discharge of the vehicle-mounted battery 25 etc. based on time. Specifically, the vehicle-side controller 29 periodically grasps the time, and determines whether the grasped time is a charge corresponding time (for example, midnight) or a discharge corresponding time (for example, daytime). And the vehicle side controller 29 controls the secondary side relay 28 based on the determination result. Specifically, the vehicle-side controller 29 switches the secondary-side relay 28 so that the vehicle-mounted battery 25 is charged when the vehicle-mounted battery 25 is discharged when it is a charging-compatible time, A switching signal is transmitted to the side controller 16. And the power supply side controller 16 switches the primary side relay 15 based on having received the said switching signal. Similarly, the controllers 16 and 29 switch the relays 15 and 28 so that the in-vehicle battery 25 is discharged when the in-vehicle battery 25 is being charged at the discharge corresponding time. Each of the relays 15 and 28 corresponds to a “discharge unit”, and each of the controllers 16 and 29 corresponds to a “control unit”.

The vehicle-side controller 29 periodically executes the discharging process when discharging is performed at the discharge corresponding time. The discharge process will be described with reference to FIG.
First, in step S101, the current charge amount of the in-vehicle battery 25 is grasped. Thereafter, the process proceeds to step S102, and it is determined whether or not a forced continuation flag is stored in a predetermined storage area (for example, RAM) of the vehicle-side controller 29. The forced continuation flag is a flag that is set when it is determined that the discharge is manually forced.

  When the forced continuation flag is not set, the process proceeds to step S103, and it is determined whether or not the current charge amount is smaller than a predetermined minimum charge amount. The minimum charge amount is, for example, the minimum charge amount required for the vehicle to travel, and can be arbitrarily set by the user.

  If the current charge amount is equal to or greater than the minimum charge amount, a negative determination is made in step S103, and the present process ends. Thereby, discharge is continued. On the other hand, when the current charge amount is smaller than the minimum charge amount, in steps S104 to S111, the charge amount is notified and the user is prompted to select whether or not to continue the discharge. When there is no request for continuation, a process for automatically terminating the discharge is executed.

  Specifically, the discharge is interrupted in step S104. Specifically, the switch 25a is turned off. Then, it progresses to step S105 and performs the alerting | reporting process which alert | reports that charge amount is the minimum charge amount. Specifically, the alarm sound generator 31 generates an alarm sound.

  In the subsequent manual input request process in step S106, a display (notification) is made to select whether or not to continue (restart) the discharge on the input unit 32, and the input unit 32 is continuously discharged from the user or the discharge is terminated. Make the input possible.

  Thereafter, in step S107, it is determined whether or not the discharge unit has been continuously input to the input unit 32. If it is determined that the discharge continuation input has been made, the forced continuation flag is set in step S108, the discharge is restarted (switch 25a is turned on) in step S109, and the process is terminated.

  On the other hand, if there is no input to continue the discharge, a negative determination is made in step S107, and the process proceeds to step S110. In step S110, it is determined whether an end of discharge has been input or whether a predetermined standby time (interruption time) has elapsed from the execution timing of the process in step S106. If neither condition is satisfied, the process returns to step S107. On the other hand, if any one of the conditions is satisfied, the process proceeds to step S111, and the process proceeds to a discharge end sequence. In the discharge end sequence, the discharge is terminated when the discharge is continued, and is erased when the forced continuation flag is set. Then, this process ends.

  If the forced continuation flag is set in step S102, it means that there has been a request to continue discharging manually when the current charge amount is smaller than the minimum charge amount. In this case, the process proceeds to step S112, and it is determined whether or not the current charge amount is “0”. If the current charge amount is not “0”, the process is terminated as it is. Thereby, charging will be continued. On the other hand, when the current charge amount is “0”, the discharge end sequence in step S111 is executed, and this process is ended.

Next, the effect | action of the non-contact electric power transmission system 10 of this embodiment is demonstrated.
In the non-contact power transmission system 10 configured to be able to charge and discharge the in-vehicle battery 25, the in-vehicle battery 25 is charged and discharged according to time. As a result, for example, it is possible to perform a peak shift in which the vehicle-mounted battery 25 is charged at night when the electricity rate is low and discharged during the day when the electricity rate is high.

  In such a configuration, when the charge amount becomes the minimum charge amount during automatic discharge, a warning sound is generated. Thereby, the user can grasp that the present charge amount became the minimum charge amount. Further, it is possible to select whether to continue or end the discharge manually. Then, when it is selected to end the discharge manually or when the standby time has elapsed, the discharge ends. Thereby, the charge amount of the vehicle-mounted battery 25 does not become smaller than the minimum charge amount.

  On the other hand, when it is selected to continue the discharge manually, the discharge is continued until the charge amount of the in-vehicle battery 25 becomes “0”. Thereby, the electric power charged in the vehicle-mounted battery 25 can be utilized to the maximum extent.

According to the embodiment described in detail above, the following excellent effects are obtained.
(1) In a situation in which the in-vehicle battery 25 is automatically discharged, a notification regarding the charge amount of the in-vehicle battery 25 is made. Specifically, the alarm sound is generated when the charge amount of the in-vehicle battery 25 becomes the minimum charge amount. And it was set as the state which can select whether discharge is continued manually. Thereby, the user can grasp that the charge amount of the in-vehicle battery 25 has reached the minimum charge amount in the situation where the discharge of the in-vehicle battery 25 is automatically performed, and the user can perform the discharge according to the situation. It is possible to determine continuation (resumption) or termination. Therefore, since the user's will can be reflected in the situation where the discharge is automatically performed, it is possible to achieve both the convenience of the automatic and the flexibility of reflecting the user's will.

  In the first place, the non-contact power transmission system 10 capable of performing non-contact power transmission has a technical value in that no user operation such as connecting a plug is required. In this case, if it is set as the structure which charges / discharges the vehicle-mounted battery 25 manually, the said technical value of the non-contact electric power transmission system 10 may be impaired. In this respect, in the present embodiment, by adopting a configuration in which charging / discharging of the in-vehicle battery 25 is automatically performed, it is possible to achieve an effect such that peak shift can be performed without impairing the technical value. Thus, when charging / discharging of the vehicle-mounted battery 25 is performed automatically, it is not necessary for the user to know the charge amount of the vehicle-mounted battery 25.

  However, in a special situation different from normal, for example, in a situation where the power supply amount of the system power supply is small due to natural disasters, etc., there are cases where it is desired to take special measures such as using all the power of the in-vehicle battery 25. In such a case, the user needs to directly control the discharge of the in-vehicle battery 25. At that time, the user may want to grasp the charge amount of the in-vehicle battery 25 as the determination of the discharge control.

  On the other hand, in the present embodiment, when the current charge amount of the in-vehicle battery 25 becomes the minimum charge amount, an alarm sound is generated, and it is possible to manually select the continuation or end of the discharge. . Thereby, as a user, the present charge amount can be grasped | ascertained and direct discharge control can be performed based on the grasp result and the condition.

  (2) When the charge amount of the in-vehicle battery 25 becomes the minimum charge amount, the discharge of the in-vehicle battery 25 is interrupted. Thereby, it is possible to suppress the discharge from being continued even though the user does not input the discharge. Therefore, the discharge contrary to the user's will can be suppressed.

  (3) Further, when the user inputs discharge continuation, the interruption of discharge of the in-vehicle battery 25 is canceled, and when the user inputs discharge end or when the standby time has elapsed, the in-vehicle battery It was set as the structure which complete | finishes 25 discharges. Thereby, while allowing the user's will to be reflected, the discharge can be automatically terminated when there is no user's intention, and both convenience and reflection of the user's will can be achieved.

In addition, you may change the said embodiment as follows.
In embodiment, charging / discharging of the vehicle-mounted battery 25 was automatically performed based on time, but it is not restricted to this. For example, a configuration in which charging / discharging of the in-vehicle battery 25 is automatically performed according to the power state (for example, the amount of power used in the existing facility or the maximum amount of power that can be used) in the existing facility (home, factory, etc.) Alternatively, it may be configured to automatically discharge at a specific event (for example, at the time of a disaster).

  In the embodiment, the notification is made when the charge amount of the in-vehicle battery 25 reaches the minimum charge amount in a situation where the in-vehicle battery 25 is automatically discharged. In a situation where 25 discharges are automatically performed, a notification regarding the current charge amount may be made when a power outage or power consumption is limited in a system power supply or the like.

  In the embodiment, the vehicle-side controller 29 is adopted as a configuration for performing charge / discharge control based on time, but the present invention is not limited to this, and the subject of control is arbitrary. For example, the power controller 16 may be configured to perform the above control. Moreover, it is good also as a structure which the controller different from each controller 16 and 29 performs determination of charge / discharge. In this case, the other controller may transmit the determination result to the controllers 16 and 29, and the controllers 16 and 29 may control the relays 15 and 28 based on the determination result.

  In the embodiment, the alarm sound of the alarm sound generation device 31 is adopted as the notification when the charge amount of the in-vehicle battery 25 becomes the minimum charge amount, but is not limited thereto, and the notification mode is arbitrary. For example, it is good also as a structure which displays a warning on a display apparatus, and it is good also as a structure which performs both an alarm sound and a warning display.

  In addition, although the notification is made when the charge amount of the in-vehicle battery 25 becomes the minimum charge amount, the notification is not limited to this, and the notification timing, notification time, and notification frequency are arbitrary. For example, it is good also as a structure which alert | reports the charge amount of the vehicle-mounted battery 25 always or intermittently in the condition where charging / discharging of the vehicle-mounted battery 25 is performed automatically.

  In addition, as a notification device, a configuration provided separately or a configuration using an existing configuration may be used. As an existing configuration, for example, when a navigation device is mounted on a vehicle, a configuration may be adopted in which notification is given by a display screen or sound of the navigation device.

  In the embodiment, the alarm sound generation device 31 is mounted on the vehicle-side device 21, but is not limited thereto, and may be mounted on the ground-side device 11, for example, or may be mounted on both. Moreover, it is good also as a structure which provides a alerting | reporting apparatus independently separately from the ground side apparatus 11 and the vehicle side apparatus 21. FIG. In this case, the vehicle-side controller 29 may transmit a signal to the notification device at the notification timing (timing when the charge amount of the in-vehicle battery 25 becomes the minimum charge amount), and the notification device may perform the notification. .

  In the embodiment, when the charge amount of the in-vehicle battery 25 becomes the minimum charge amount, the discharge of the in-vehicle battery 25 is interrupted. However, the present invention is not limited to this. For example, it is good to set it as the structure which compares the said threshold charge amount with the present charge amount by making into a threshold charge amount the charge amount which added the charge amount discharged by waiting time with respect to the minimum charge amount. Thereby, it can avoid that the present charge amount becomes smaller than the minimum charge amount at the elapse timing of the standby time.

  In embodiment, although the input part 32 was provided in the vehicle side apparatus 21 as what receives an input from a user, it is not restricted to this, You may provide in the ground side apparatus 11, the ground side apparatus 11 and the vehicle side apparatus 21 It may be provided separately.

  In addition, an existing configuration may be used as the input unit 32. For example, a navigation device mounted on a vehicle may be configured to function as the input unit 32. When a device that displays the usage status of the system power supply and can be input from the user is provided, the device is input. The unit 32 may function.

  In the embodiment, the notification regarding the charge amount of the in-vehicle battery 25 is performed in a state where discharge is automatically performed. However, the embodiment is not limited thereto, and the charge of the in-vehicle battery 25 is performed in a state where charging is performed automatically. It is good also as a structure which performs alerting | reporting regarding quantity.

  ○ In the above configuration, for example, in a situation where charging is performed automatically, the status of the system power supply (for example, when the maximum amount of power that can be used in the system power supply is limited or the amount of power used is the threshold power It is good also as a structure which performs alerting | reporting regarding the present charge amount based on the case where it increases more than charge. And it is good to set it as the structure which selects whether charging continues. Thereby, a user can judge whether charging of the vehicle-mounted battery 25 is continued in a special situation.

  Specifically, for example, in a situation where the in-vehicle battery 25 is charged using a home system power supply, notification is performed when the amount of power used is greater than the threshold power amount. Thereby, as a user, the charge amount of the vehicle-mounted battery 25 can be grasped, and it can be determined whether or not priority is given to the charge of the vehicle-mounted battery 25 based on the grasped result. Therefore, as a user, for example, if the charge amount of the in-vehicle battery 25 is sufficient, the charging is terminated, and if the charge amount of the in-vehicle battery 25 is insufficient and it is desired to charge immediately, the user uses it at home. You can take measures to refrain from using electrical appliances.

  In the embodiment, the configuration is such that, when the current charge amount becomes the minimum charge amount, it is possible to manually select whether or not to continue discharging. However, the present invention is not limited to this. For example, a mode in which charging / discharging of the in-vehicle battery 25 is manually controlled and a mode in which it is controlled automatically are provided, and in a situation where charging / discharging of the in-vehicle battery 25 is performed, either mode can be selected. Good. In this case, the charge amount of the in-vehicle battery 25 may be notified in the automatic control mode.

  O The external load X is arbitrary as long as it has a predetermined impedance. For example, it may be a battery provided in a factory or a home, or may be a device that converts to system power.

  In the embodiment, the vehicle-side controller 29 stops charging / discharging by turning off the switch 25a. However, the present invention is not limited to this. For example, the switch 25a can be operated by the vehicle-side controller 29 and the user May be configured to be operable. In this case, the user's will can be reflected through the user's direct operation of the switch 25a.

The waveform of the high frequency power output from the primary side high frequency power supply 12 is not limited to a sine wave, and may be a pulse wave, for example.
In the embodiment, the capacitors 13b and 23b are provided, but these may be omitted. In this case, magnetic field resonance may be performed using parasitic capacitances of the coils 13a and 23a.

In the embodiment, the resonance frequencies of the resonators 13 and 23 are set to be the same. However, the present invention is not limited to this, and both may be made different within a range where power transmission is possible.
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 embodiment, although the vehicle side apparatus 21 was mounted in the vehicle, it is not restricted to this, The structure mounted in other apparatuses, such as a mobile telephone, may be sufficient.
○ If the user wants to discharge after executing the discharge end sequence, it may be configured to forcibly discharge. For example, when a forced discharge switch is provided and the forced discharge switch is operated, the discharge is performed even if the discharge is not performed (the charge state or the state where neither charge nor discharge is performed). It is good also as a structure which performs the sequence to start.

  In the embodiment, the in-vehicle battery 25 is discharged through the coils 13a and 23a. However, the present invention is not limited to this, and the configuration is such that the discharged power is transmitted without passing through the coils 13a and 23a. There may be. In this case, for example, a discharge resonance circuit that performs power transmission in a non-contact manner may be provided separately.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) When the charge amount of the power storage device becomes a predetermined specific charge amount in a state where the power storage device is automatically discharged, the discharge of the power storage device is interrupted,
In the situation where the discharge of the power storage device is interrupted, the selection means restarts the discharge when selected to perform the discharge, while the selection means selects not to perform the discharge or the The contactless power transmission system according to claim 3, wherein the discharge is terminated when a discharge interruption time elapses for a predetermined standby time.

(B) The secondary device is mounted on a vehicle,
The vehicle is provided with a traveling motor that is driven using electric power charged in the power storage device,
The non-contact power transmission system according to claim 2, wherein the specific charging amount is set in correspondence with a distance that can be traveled using electric power charged in the power storage device.

(C) As a power transmission path,
A charging path that is a power transmission path when charging the power storage device;
A discharge path that is a power transmission path when discharging the power storage device;
Is provided,
Switching means for switching the power transmission path to the charging path and the discharging path;
By automatically controlling the switching means, control means for automatically switching charging and discharging of the power storage device,
The contactless power transmission system according to any one of claims 1 to 3, and the technical ideas (a) and (b).

  (D) When the power storage device is automatically charged, notification regarding the charge amount of the power storage device is performed according to the status of the system power supply. The non-contact power transmission system according to any one of (a) to (c).

  (E) A primary side device having a primary side coil to which AC power is input, a secondary side coil capable of receiving the AC power in a non-contact manner from the primary side coil, and the secondary side coil. A power storage device that is charged by the AC power; a discharge unit that discharges the power stored in the power storage device; and a control unit that controls the discharge unit to perform the discharge at a predetermined time. A non-contact power transmission system comprising: a secondary-side device, and capable of transmitting power discharged from the power storage device from the secondary-side device to the primary-side device, wherein the discharge is performed. A non-contact power transmission system, wherein a notification regarding a charge amount of the power storage device is performed in a situation where a control unit controls the discharge unit.

  (F) The technical concept characterized in that electric power discharged from the power storage device is transmitted from the secondary device to the primary device via the primary coil and the secondary coil. The contactless power transmission system described in e).

  (G) The predetermined predetermined time is a time set by a user or a time when a specific event occurs, and the non-contact power described in the technical idea (e) or (f) Transmission system.

  (H) Charged by the secondary coil capable of receiving the AC power in a non-contact manner from the primary device having the primary coil to which AC power is input, and the AC power received by the secondary coil. Power storage device, a discharge unit that discharges the electric power stored in the power storage device, and a control unit that controls the discharge unit so that the discharge is performed at a predetermined time, from the power storage device The power storage device is a charge / discharge device capable of transmitting the discharged power to the primary device in a contactless manner, wherein the control unit controls the discharge unit so that the discharge is performed. When the end of the discharge of the power storage device is instructed after the notification indicating that the amount of charge has reached a predetermined specific charge amount, the discharge unit is controlled to end the discharge. Charging / discharging equipment characterized by doing.

(I) The predetermined predetermined time is a time set by a user or a time when a specific event occurs, and the charging / discharging device according to the technical concept (h).
In the technical ideas (e) and (h), “a control unit that controls the discharge unit so that the discharge is performed at a predetermined time” is referred to as “when a predetermined discharge condition is satisfied. You may replace with the control part which controls the said discharge part so that the said discharge may be performed. In this case, the discharge condition may be, for example, a predetermined specific time, or a predetermined specific event. The specific event may be, for example, a case where an abnormality occurs in the power supply status of the system power supply.

  DESCRIPTION OF SYMBOLS 10 ... Non-contact electric power transmission system, 11 ... Ground side apparatus, 12 ... Primary side high frequency power supply, 13a ... Primary side coil, 15 ... Primary side relay (discharge part), 16 ... Power source side controller (control part), DESCRIPTION OF SYMBOLS 21 ... Vehicle side apparatus (charging / discharging apparatus), 23a ... Secondary side coil, 25 ... In-vehicle battery (power storage device), 25a ... Switch, 28 ... Secondary side relay (discharge part), 29 ... Vehicle side controller (control part) ), 31... Alarm sound generator, 32.

Claims (4)

A primary device having a primary coil to which AC power is input;
A secondary side device having a secondary side coil capable of receiving the AC power without contact from the primary side coil and a power storage device charged by the AC power received by the secondary side coil;
A non-contact power transmission system capable of transmitting power discharged from the power storage device from the secondary device to the primary device,
A contactless power transmission system in which a notification regarding a charge amount of the power storage device is performed in a state where the power storage device is automatically discharged.   2. The non-contact according to claim 1, wherein the notification is performed when a charge amount of the power storage device becomes a predetermined specific charge amount in a situation where the power storage device is discharged. Power transmission system. When the notification is performed, comprising a selection means capable of manually selecting whether to perform the discharge,
3. The contactless power transmission system according to claim 1, wherein when the end of the discharge is selected by the selection unit, the discharge is ended. 4. A secondary coil capable of receiving the AC power in a non-contact manner from a primary device having a primary coil to which AC power is input, and a power storage device charged by the AC power received by the secondary coil. A charge / discharge device capable of transmitting the electric power discharged from the power storage device to the primary device in a contactless manner,
An end of discharge of the power storage device is instructed after a notification indicating that the charge amount of the power storage device has reached a predetermined specific charge amount in a situation where the power storage device is being automatically discharged. In the case of charging, the discharging is terminated.