JP2015192585A - Electric vehicle charging device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for charging an electric vehicle capable of preventing a breaker from being set open even if other electrical equipment is used during a regular charging of the electric vehicle.SOLUTION: From a maximum current to a zero current that can be received by a dedicated outlet 13 of a general consumer are set in a setter 18 as a current target value at the time of charging an electric vehicle 11. A control part 19, when charging a battery 12, controls an electric power conversion device 17 so that a charging current supplied from a plug 14 inserted in the dedicated outlet 13 of the general consumer to receive an AC current becomes the current target value set in the setter 18. The electric power conversion device 17 converts the AC power received by the plug 14 to a DC power to charge the DC power to the battery 12 of the electric vehicle 11.

Description

  The present invention relates to an electric vehicle charging apparatus and method for charging a battery of an electric vehicle by normal charging.

  There are two types of battery charging methods for electric vehicles: normal charging and rapid charging, and ordinary consumers are mainly charged (for example, see Patent Documents 1 and 2). In general, charging is performed with the maximum current that can be received by a dedicated outlet. In particular, in the case of normal charging performed in a general household among general consumers, charging power is supplied to the electric vehicle from a distribution board in the residence. Therefore, in a general household, the battery of the electric vehicle is charged within the range of the contracted capacity determined by the contract with the power supply company.

JP, 2014-030283, A JP 2013-055845 A

  However, the maximum current that can be received by a general consumer's dedicated outlet is as large as 15A, and if other electric devices are used during normal charging of the electric vehicle, the contracted capacity may be exceeded. Since the breaker is opened when the contracted capacity is exceeded, the use of electrical equipment that instantaneously uses a large amount of power must be avoided during normal charging of the electric vehicle. To make it possible to use other electrical devices without opening the breaker even during normal charging of the electric vehicle, the contracted capacity can be increased. However, if the contracted capacity is increased, the electric vehicle is normally charged. Since it is not a steady load, there may be an excessive contract capacity.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electric vehicle charging device and method capable of suppressing the breaker from being opened even when other electric devices that use a large amount of electric power instantaneously during normal charging of the electric vehicle are used. It is.

  An electric vehicle charging device according to the present invention is a power conversion device that converts AC power received by a plug for receiving AC power into a dedicated outlet of a general consumer to DC power and charges the battery of the electric vehicle with DC power. A setter capable of setting a current target value during charging of the electric vehicle from a maximum current that can be received at a dedicated outlet of the general consumer to zero current, and a charging current supplied from the plug when charging the battery. And a control unit that controls the power converter so that the current target value set by the setting device is obtained.

  In the method for charging an electric vehicle according to the present invention, a usage current of a general consumer is detected by a usage current detector, and the usage current detected by the usage current detector is determined by a contract between the general consumer and a power supply company. A target current value in a range not exceeding the contracted capacity is calculated, a charging current supplied from a plug plugged into the general consumer's dedicated outlet and receiving AC power is detected, and a charging current supplied from the plug is A power converter that converts the AC power into DC power is controlled so that the calculated current target value is obtained, and the battery of the electric vehicle is charged with DC power.

  According to the present invention, the control unit controls the power converter so that the charging current supplied from the plug when charging the battery becomes the current target value set by the setting device. By setting the current target value of the charging current of the electric vehicle in the setting device within a range that does not exceed the contracted capacity in accordance with the usage status, it is possible to prevent the breaker from being opened exceeding the contracted capacity. Therefore, normal charging of the electric vehicle can be performed without increasing the contract capacity.

The block diagram of the charging device of the electric vehicle which concerns on 1st Embodiment of this invention. The block diagram of the charging device of the electric vehicle which concerns on 2nd Embodiment of this invention. The block diagram of the charging device of the electric vehicle which concerns on 3rd Embodiment of this invention. The block diagram of the charging device of the electric vehicle which concerns on 4th Embodiment of this invention. The block diagram of the charging device of the electric vehicle which concerns on 5th Embodiment of this invention. The block diagram of the charging device of the electric vehicle which concerns on 6th Embodiment of this invention. The block diagram of the charging device of the electric vehicle which concerns on 7th Embodiment of this invention. The flowchart which shows an example of the charging method of the electric vehicle which concerns on 8th Embodiment of this invention.

  Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of a charging device for an electric vehicle according to a first embodiment of the present invention. The battery 12 is mounted on the electric vehicle 11, and the battery 12 of the electric vehicle 11 is charged by inserting a plug 14 into a dedicated outlet 13 for general consumers.

  The plug 14 is connected to the power receiving port 16 of the charging device 15, and the AC power received by the plug 14 is input to the power conversion device 17. The power conversion device 17 converts AC power received by the plug 14 into DC power and charges the battery 12 with DC power.

  The setter 18 sets a target current value Ir when the battery 12 is charged, and the electric vehicle operates from a maximum current Imax (for example, 15 A) to a zero current I0 (0 A) that can be received by a dedicated outlet 13 for general consumers. 11 is set as the current target value Ir during charging. The setter 18 may be capable of continuously setting the current target value Ir in an analog manner from the maximum current Imax to the zero current I0, or may be set as a discrete current target value Ir. Good. In the setting of the discrete current target value Ir, for example, the maximum current Imax (for example, 15 A), the first intermediate current Imid1 (for example, 10 A), the second intermediate current Imid2 (for example, 5 A), zero as the current target value Ir. A device capable of setting the current I0 (0 A) is prepared.

  The control unit 19 includes a battery temperature T detected by the temperature detector 20, a DC charging current Id to the battery 12 detected by the DC ammeter 21, a DC charging voltage Vd to the battery 12 detected by the DC voltmeter 22, The AC charging current Ia (charging current supplied from the plug 14) to the power converter 17 detected by the AC ammeter 23 and the AC charging voltage Va to the power converter 17 detected by the AC voltmeter 24 are input. When the battery 12 is charged, the power converter 17 is controlled so that the charging current Ia supplied from the plug 14 becomes the current target value Ir set by the setting device 18.

  In general, since the voltage of the battery 12 fluctuates with the charging depth or temperature change, the temperature of the battery 12 is detected, and the remaining battery power is detected by comparing the voltage value set with respect to the detected temperature and the voltage of the battery 12. The amount state is determined and charging is performed. When the battery 12 is a lithium ion battery, the charging current is gradually increased toward the current target value Ir, and when the battery 12 reaches the current target value Ir, charging is performed by constant current charging. When the input voltage Vd of 12 reaches a predetermined value Vk, the process shifts to constant voltage charging. That is, in constant current charging, the input current Id of the battery 12 is constant and the input voltage Vd gradually increases. When the input voltage V of the battery 12 reaches a predetermined value Vk, the battery 12 shifts to constant voltage charging, and the charging current Id gradually decreases.

  Since the charging current Id changes in this way, the control unit 19 sets the charging target Ia supplied from the plug 14 to the current target value set by the setting unit 18 when charging the battery 12 at constant current charging. The power converter 17 is controlled to perform constant current charging with a DC charging current Id that becomes Ir. Then, when the input voltage V of the battery 12 reaches a predetermined value Vk, the process shifts to constant voltage charging, and the charging current Id is charged with a value equal to or smaller than the current target value Ir set by the setting device 18.

  According to the first embodiment of the present invention, when the battery 12 is charged by setting the current target value Ir of the charging current of the electric vehicle in the setting device 18 within a range not exceeding the contracted capacity, the plug 14 The power conversion device 17 can be controlled by the control unit 19 so that the charging current Ia supplied from the controller does not exceed the current target value Ir set by the setting device 18. Therefore, it is possible to prevent the breaker from being opened by exceeding the contracted capacity according to the power usage state of the general consumer, and the electric vehicle can be normally charged without increasing the contracted capacity. Moreover, since it can charge with a small charging current, the heat_generation | fever at the time of charging reduces and charging efficiency improves at a fixed ratio.

  The charging completion time and the required charging time when charging is performed with the set charging target value Ir may be displayed inside the vehicle or transmitted to various display devices such as a mobile phone for display. Further, the charging start time may be set by a timer or the like.

  The maximum current that can be set by the setting device 18 may be the maximum current associated with the position information of the electric vehicle set in advance. That is, the charging facility for charging the electric vehicle is specified by the position information of the electric vehicle. When charging is performed at a charging facility having a different contract capacity by this function, it is not necessary to set a charging target value in the setting device 18 again. Note that GPS or the like may be used for vehicle position information.

  FIG. 2 is a configuration diagram of a charging device for an electric vehicle according to a second embodiment of the present invention. This second embodiment is different from the first embodiment shown in FIG. 1 in that the contract capacity storage unit 25 stores the contract capacity determined by the contract between the general customer and the power supply company, and the current used by the general consumer. When the battery 12 is charged based on the receiving unit 26 to be received and the usage current received by the receiving unit 26 and the contracted capacity stored in the contracted capacity storage unit 25, the usage current of the general consumer is within a range not exceeding the contracted capacity. A target value calculation unit 27 that calculates a current target value and sets it in the setting device 18 is additionally provided. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  The contract capacity storage unit 25 stores a contract capacity determined by a contract between a general consumer and a power supply company. Contract capacity is represented by contract current. The receiving unit 26 receives the use current Iu of the general consumer transmitted from the transmitting unit 28 and outputs it to the target value calculating unit 27. The use current Iu of the general consumer is detected by an ammeter 29 installed in the general consumer. Communication between the transmission unit 28 and the reception unit 26 may be wireless or wired. In the case of wired communication, a dedicated communication line may be provided, or power line communication PLC (Power Line Communications) using an electric wire of the plug 14 may be used.

  The target value calculation unit 27 inputs the use current Iu received by the reception unit 26 and the contract capacity stored in the contract capacity storage unit 25, and when charging the battery 12 based on these, the target consumer's use current A current target value Ir in a range where Iu does not exceed the contracted capacity is calculated. For example, when the use current Iu received by the receiving unit 26 is 18 A and the contract capacity is 40 A, the marginal current Iα of the difference is 22 A. Assuming that the allowable power consumption fluctuation Iβ (= 5A) is present, the practical margin current Iγ considering the allowable power fluctuation fluctuation Iβ (= 5A) is 17A (Iγ = Iα−Iβ = 22A−5A = 17A). In this case, since the practical margin current Iγ (= 17 A) is larger than the maximum current Imax (for example, 15 A) that can be received by the dedicated outlet 13, the target value calculation unit 27 calculates the maximum current Imax (for example, 15 A) as the current target value Ir. Then, the calculated current target value Ir (= Imax = 15 A) is set in the setting device 18.

  Further, when the use current Iu received by the receiving unit 26 is 14A and the contracted capacity is 30A, the difference margin current Iα is 16A and the practical margin current Iγ is 11A. In this case, since the practical margin current Iγ (= 11 A) is smaller than the maximum current Imax (for example, 15 A) that can be received by the dedicated outlet 13, a value equal to or smaller than the practical margin current Iγ (= 11 A) is calculated as the current target value Ir. For example, when the setting device 18 can continuously set the current target value Ir in an analog manner, a practical margin current Iγ (= 11 A) is calculated as the current target value Ir, and the calculated current target value Ir ( = 11A) is set in the setting device 18. When the setting device 18 can set the discrete current target value Ir, the nearest first intermediate current Imid1 (for example, 10 A) which is equal to or less than the practical margin current Iγ (= 11 A) is calculated as the current target value Ir. The calculated current target value Ir (= 10 A) is set in the setting device 18.

  Further, when the practical margin current Iγ is (= 4A), when the setting device 18 can set the current target value Ir continuously in an analog manner, the practical margin current Iγ is set as the current target value Ir. (= 4 A) is calculated, and the calculated current target value Ir (= 11 A) is set in the setting device 18. When the setter 18 is capable of setting a discrete current target value Ir, the nearest zero current I0 (0A) that is equal to or less than the practical margin current Iγ (= 4 A) is calculated as the current target value Ir. The target current value Ir (= 0 A) is set in the setting device 18. In this case, the charging current supplied to the battery 12 of the electric vehicle 11 is zero.

  According to the second embodiment of the present invention, when charging the battery 12, based on the use current Iu received by the reception unit 26 and the contract capacity stored in the contract capacity storage unit 25, the use current Iu of the general consumer Since the current target value Ir in a range that does not exceed the contracted capacity is calculated, the battery 12 of the electric vehicle 11 can be charged in a range in which the use current Iu of the general consumer does not exceed the contracted capacity. As a result, it is possible to prevent the breaker from being opened due to exceeding the contract capacity, and the electric vehicle can be normally charged without increasing the contract capacity.

  FIG. 3 is a configuration diagram of a charging device for an electric vehicle according to a third embodiment of the present invention. This third embodiment is different from the second embodiment shown in FIG. 2 in that current information corresponding to the marginal current of the difference between the used current received by the receiving unit 26 and the contracted capacity stored in the contracted capacity storage unit 25 is obtained. A current information calculation unit 30 to be calculated and a current information display unit 31 to display the current information calculated by the current information calculation unit 30 are additionally provided. The same elements as those in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.

  In the second embodiment shown in FIG. 2, when charging the battery 12, the target value calculation unit 27 calculates the current target value Ir and sets the calculated current target value Ir in the setting device 18. There is a possibility that the current target value Ir is not suitable for the power consumption that changes over time. Therefore, in the third embodiment, the current information calculation unit 30 is provided to monitor the current used that changes every moment.

  The current information calculation unit 30 calculates current information corresponding to the marginal current of the difference between the use current received by the reception unit 26 and the contract capacity stored in the contract capacity storage unit 25. The current information calculation unit 30 obtains a practical margin current Iγ obtained by subtracting the allowable power fluctuation Iβ from the marginal current Iα of the difference between the usage current received by the reception unit 26 and the contracted capacity stored in the contracted capacity storage unit 25. Current information (alarm level) is determined by comparing the practical margin current Iγ and a predetermined threshold value, and the determined current information is displayed on the current information display unit 31.

  For example, when the practical surplus current Iγ is smaller than the first threshold value Ix1 (for example, 1A) (Iγ <Ix1 (= 1A)), an alarm is output to the current information display unit 31 as current information, whereby the current information The display unit 31 displays an alarm. When the practical margin current Iγ is larger than the first threshold value Ix1 (for example, 1A) and smaller than the second threshold value Ix2 (for example, 5A) (Ix1 (= 1A) <Iγ <Ix2 (= 5A)), current information A warning is output as current information to the display unit 31, and the current information display unit 31 thereby displays a warning. When the practical margin current Iγ is larger than the second threshold value Ix2 (for example, 5A) (Iγ> Ix2 (= 5A)), a margin is output as current information to the current information display unit 31, thereby the current information display unit 31 indicates a margin.

  In determining the current information (alarm level) in the current information calculation unit 30, the duration of the practical margin current Iγ may be considered. For example, when the practical margin current Iγ becomes smaller than the first threshold value Ix1 (for example, 1 A), an alarm is not immediately output as current information, but the practical margin current Iγ is more than the first threshold value Ix1 (for example, 1 A). When the reduced state continues for a predetermined time or more, an alarm is output as current information.

  In addition, when there is a natural energy power generation facility such as a solar power generation facility, a wind power generation facility, or a small hydropower generation facility, if power generation is restricted due to restrictions on the power system, excess power from the natural energy power generation facility is used. In this state, the current information may be excessive absorption.

  Further, the target value calculation unit 27 calculates the current target value Ir in consideration of the current information from the current information calculation unit 30 and updates the current target value Ir set in the setting device 18. For example, when an alarm is received as current information from the current information calculation unit 30, the current target value Ir is updated to a current target value reduced by 10%. When the setting device 18 can set the discrete current target value Ir, the discrete stage is updated to a current target value that is lowered by one or more stages. When the alert is received as the current information, the current target value Ir is updated to the current target value reduced by 5%, and the setter 18 can set the discrete current target value Ir. The current stage is updated to the current target value Ir which is lowered by one stage.

  On the other hand, when surplus absorption is received as current information, the current target value is increased by 5% or updated to a current target value increased by one or more discrete steps. In making these determinations, the duration of the current information may be taken into consideration.

  In the above description, the case where the current information display unit 31 is provided on the electric vehicle side has been described. However, the current information display unit 31 may be provided on the general consumer side. Moreover, you may make it provide the electric current information display part 31 in both the electric vehicle side and the general consumer side.

  According to the third embodiment, the current information calculating unit 30 monitors the usage current that changes from moment to moment, and the received current received by the receiving unit 26 of the electric vehicle side charging device 15A and the contracted capacity stored in the contracted capacity storage unit 25. Is calculated and displayed on the current information display unit 31, the current information (alarm level) can be appropriately grasped. In addition, since the current target value Ir can be updated to match the power consumption that changes over time, even if the power consumption changes, it is possible to prevent the breaker from being opened by exceeding the contract capacity, and the contract capacity can be increased. The electric vehicle can be charged normally without having to do so.

  FIG. 4 is a configuration diagram of a charging device for an electric vehicle according to a fourth embodiment of the present invention. In the fourth embodiment, a contract capacity storage unit 25 and a target value calculation unit 27 are provided on the general consumer side with respect to the second embodiment shown in FIG. Accordingly, the current target value Ir calculated by the target value calculation unit 27 is transmitted from the transmission unit 28 to the reception unit 26, and the reception unit 26 outputs the received current target value Ir to the setting device 18. The same elements as those in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 4, the charging device 15 includes an electric vehicle side charging device 15A and a general consumer side charging device 15B. The electric vehicle-side charging device 15 </ b> A includes a power conversion device 17 that charges DC power to the battery 12 of the electric vehicle 11, and a setting device 18 that sets a target current value of the charging current when the battery 12 of the electric vehicle 11 is charged. Information that is transmitted from the general consumer side charging device 15B and the control unit 19 that controls the power conversion device 17 so that the charging current becomes the current target value Ir set by the setting device 18 when the battery 12 is charged. The receiving unit 26 receives the signal.

  On the other hand, the general consumer side charging device 15B includes a contract capacity storage unit 25 that stores contract capacity determined by a contract between a general customer and a power supply company, and a use current and contract capacity storage unit 25 detected by the ammeter 29. When the battery 12 is charged based on the contracted capacity stored in the table, the target value calculating unit 27 calculates a current target value in a range in which the use current of the general consumer does not exceed the contracted capacity, and the target value calculating unit 27 calculates the current target value. The transmission unit 28 transmits the target current value to the reception unit 26 of the electric vehicle side charging device 15 </ b> A of the electric vehicle 11.

  The contract capacity storage unit 25 of the general consumer side charging device 15B is represented by the contract current determined by the contract between the general consumer and the power supply company, as in the contract capacity storage unit of the second embodiment shown in FIG. The stored contract capacity is stored. The target value calculation unit 27 inputs the use current Iu detected by the ammeter 29 and the contract capacity stored in the contract capacity storage unit 25 and uses the general consumer when charging the battery 12 based on these. A current target value Ir in a range where the current Iu does not exceed the contracted capacity is calculated. The current target value Ir calculated by the target value calculation unit 27 is calculated in the same manner as the target value calculation unit of the second embodiment shown in FIG. The transmission unit 28 transmits the current target value Ir calculated by the target value calculation unit 27 to the reception unit 26 of the electric vehicle side charging device 15A. In the receiving unit 26 of the electric vehicle side charging device 15A, the current target value Ir transmitted from the transmitting unit 28 of the general consumer side charging device 15B is set in the setting device 18.

  According to the fourth embodiment of the present invention, the receiving unit 26 of the electric vehicle side charging device 15A is configured such that the usage current Iu detected by the ammeter 29 that detects the usage current of the general consumer is determined by the general consumer and the power supply company. Current target value Ir within a range that does not exceed the contracted capacity determined by the contract with and is output to the setting device 18, so that, as in the second embodiment, the usage current Iu of general consumers does not exceed the contracted capacity. The battery 12 of the electric vehicle 11 can be charged. As a result, it is possible to prevent the breaker from being opened due to exceeding the contract capacity, and the electric vehicle can be normally charged without increasing the contract capacity. Moreover, since the contract capacity storage unit 25 and the target value calculation unit 27 are provided in the general customer side charging device 15B instead of the electric vehicle side charging device 15A, the electric vehicle side charging device 15A can be simplified.

  FIG. 5 is a configuration diagram of a charging device for an electric vehicle according to a fifth embodiment of the present invention. In the fifth embodiment, the contract capacity storage unit 25 and the current information calculation unit 30 are provided on the general consumer side with respect to the third embodiment shown in FIG. Accordingly, the current information calculated by the current information calculation unit 30 is transmitted from the transmission unit 28 to the reception unit 26, and the reception unit 26 displays the received current information on the current information display unit 31 and the target value calculation unit 27. Output to. The target value calculation unit 27 calculates the current target value Ir in consideration of the current information from the current information calculation unit 30 and sets the current target value Ir in the setter 18. The same elements as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 5, the charging device 15 includes an electric vehicle side charging device 15A and a general customer side charging device 15B. The electric vehicle-side charging device 15 </ b> A includes a power conversion device 17 that charges DC power to the battery 12 of the electric vehicle 11, and a setting device 18 that sets a target current value of the charging current when the battery 12 of the electric vehicle 11 is charged. The control unit 19 that controls the power conversion device 17 so that the charging current becomes the current target value Ir set by the setting device 18 when the battery 12 is charged, and the use of general consumers when the battery 12 is charged A target value calculation unit 27 that calculates a current target value Tr in a range where the current does not exceed the contracted capacity, a current information display unit 31 that displays current information, and information transmitted from the general consumer side charging device 15B are received. The receiving unit 26 is included.

  On the other hand, the general consumer side charging device 15B includes a contract capacity storage unit 25 that stores contract capacity determined by a contract between a general customer and a power supply company, and a use current detected by the ammeter 29 and a contract capacity storage unit 25. The current information calculation unit 30 that calculates current information according to the marginal current difference from the contracted capacity stored in the current information, and the current information calculated by the current information calculation unit 30 is received by the electric vehicle side charging device 15A of the electric vehicle 11. And a transmission unit 28 for transmission to the unit 26.

  The contract capacity storage unit 25 of the general consumer side charging device 15B is represented by a contract current determined by a contract between the general consumer and the power supply company, as in the contract capacity storage unit of the third embodiment shown in FIG. The stored contract capacity is stored. The current information calculation unit 30 calculates current information according to the marginal current of the difference between the use current detected by the ammeter 29 and the contract capacity stored in the contract capacity storage unit 25. The current information calculated by the current information calculation unit 30 is the same as the current information calculated by the current information calculation unit 30 of the third embodiment shown in FIG. The transmission unit 28 transmits the current information calculated by the current information calculation unit 30 to the reception unit 26 of the electric vehicle side charging device 15A. The receiving unit 26 of the electric vehicle side charging device 15 </ b> A outputs the current information transmitted from the transmitting unit 28 of the general consumer side charging device 15 </ b> B to the current information calculation unit 30 and also outputs it to the target value calculation unit 27. The target value calculation unit 27 calculates the current target value Ir in consideration of the current information from the current information calculation unit 30 and sets the current target value Ir in the setter 18.

  According to the fifth embodiment of the present invention, the receiving unit 26 of the electric vehicle side charging device 15A outputs the current information transmitted from the transmitting unit 28 of the general consumer side charging device 15B to the current information calculating unit 30. As in the third embodiment, the current information (alarm level) can be properly grasped. Moreover, since the target value calculation unit 27 calculates and sets the current target value Ir based on the current information, the current target value Ir that is suitable for the power used can be set in the setting device 18. Thereby, even if the power used changes, it is possible to prevent the breaker from being opened due to exceeding the contracted capacity, and the electric vehicle can be normally charged without increasing the contracted capacity.

  FIG. 6 is a configuration diagram of a charging device for an electric vehicle according to a sixth embodiment of the present invention. In the sixth embodiment, the target calculation unit 27 of the electric vehicle charging device 15A is omitted from the fifth embodiment shown in FIG. The same elements as those in FIG. 5 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 6, the charging device 15 includes an electric vehicle side charging device 15A and a general customer side charging device 15B. The electric vehicle-side charging device 15 </ b> A includes a power conversion device 17 that charges DC power to the battery 12 of the electric vehicle 11, and a setting device 18 that sets a target current value of the charging current when the battery 12 of the electric vehicle 11 is charged. A control unit 19 that controls the power converter 17 so that the charging current becomes the current target value Ir set by the setting device 18 when charging the battery 12, a current information display unit 31 that displays current information, It consists of the receiving part 26 which receives the information transmitted from the general consumer side charging device 15B.

  On the other hand, the general consumer side charging device 15B includes a contract capacity storage unit 25 that stores contract capacity determined by a contract between a general customer and a power supply company, and a use current detected by the ammeter 29 and a contract capacity storage unit 25. The current information calculation unit 30 that calculates current information according to the marginal current difference from the contracted capacity stored in the current information, and the current information calculated by the current information calculation unit 30 is received by the electric vehicle side charging device 15A of the electric vehicle 11. And a transmission unit 28 for transmission to the unit 26.

  The transmission unit 28 of the general consumer side charging device 15B transmits the current information calculated by the current information calculation unit 30 to the reception unit 26 of the electric vehicle side charging device 15A. In the receiving unit 26 of the electric vehicle side charging device 15A, the current information transmitted from the transmitting unit 28 of the general consumer side charging device 15B is output to the current information calculating unit 30. In the electric vehicle side charging device 15 </ b> A, the current target value Ir during charging of the battery 12 is set in the setting device 18 based on the current information displayed and output to the current information calculation unit 30.

  According to the sixth embodiment of the present invention, the receiving unit 26 of the electric vehicle side charging device 15A outputs the current information transmitted from the transmitting unit 28 of the general consumer side charging device 15B to the current information calculating unit 30. Similarly to the fifth embodiment, the current information (alarm level) can be properly grasped. Thereby, in electric vehicle side charging device 15A, based on the current information displayed and output on current information calculation unit 30, current target value Ir of the electric vehicle charging current can be set in setting device 18 within a range not exceeding the contracted capacity. . Therefore, it is possible to prevent the breaker from being opened by exceeding the contracted capacity according to the power usage state of the general consumer, and the electric vehicle can be normally charged without increasing the contracted capacity.

  FIG. 7 is a configuration diagram of a charging device for an electric vehicle according to a seventh embodiment of the present invention. In the seventh embodiment, the contract capacity storage unit 25, the target value calculation unit 27, and the current information calculation unit 30 are provided on the general consumer side in the third embodiment shown in FIG. Accordingly, the current target value Ir calculated by the target value calculation unit 27 and the current information calculated by the current information calculation unit 30 are transmitted from the transmission unit 28 to the reception unit 26, and the reception unit 26 uses the received current target value Ir as the received current target value Ir. While outputting to the setting device 18, the received electric current information is output to the electric current information display part 31. FIG. The same elements as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 7, the charging device 15 includes an electric vehicle side charging device 15A and a general customer side charging device 15B. The electric vehicle-side charging device 15 </ b> A includes a power conversion device 17 that charges DC power to the battery 12 of the electric vehicle 11, and a setting device 18 that sets a target current value of the charging current when the battery 12 of the electric vehicle 11 is charged. Information that is transmitted from the general consumer side charging device 15B and the control unit 19 that controls the power conversion device 17 so that the charging current becomes the current target value Ir set by the setting device 18 when the battery 12 is charged. Is received, and a current information display unit 31 that displays current information received by the receiving unit 26.

  On the other hand, the general consumer side charging device 15B includes a contract capacity storage unit 25 that stores contract capacity determined by a contract between a general customer and a power supply company, and a use current and contract capacity storage unit 25 detected by the ammeter 29. When the battery 12 is charged based on the contracted capacity stored in the above, the target value calculating unit 27 that calculates the current target value in a range where the use current of the general consumer does not exceed the contracted capacity, and the use detected by the ammeter 29 The current information calculation unit 30 that calculates current information according to the marginal current of the difference between the current and the contracted capacity stored in the contracted capacity storage unit 25, and the current target value and current information calculation unit 30 calculated by the target value calculation unit 27 The transmission unit 28 transmits the current information calculated in step 1 to the reception unit 26 of the electric vehicle side charging device 15A of the electric vehicle 11.

  The contract capacity storage unit 25 of the general consumer side charging device 15B has a contract current determined by the contract between the general consumer and the power supply company, as in the contract capacity storage unit 25 of the third embodiment shown in FIG. The represented contract capacity is stored. The target value calculation unit 27 inputs the use current Iu detected by the ammeter 29 and the contract capacity stored in the contract capacity storage unit 25 when the battery 12 is charged, and based on these, the use of general consumers A current target value Ir in a range where the current Iu does not exceed the contracted capacity is calculated. The current target value Ir calculated by the target value calculation unit 27 is calculated in the same manner as the target value calculation unit of the third embodiment shown in FIG.

  The current information calculation unit 30 calculates current information according to the marginal current of the difference between the use current detected by the ammeter 29 and the contract capacity stored in the contract capacity storage unit 25. The current information calculation unit 30 obtains a practical margin current Iγ obtained by subtracting the amount of allowable power fluctuation Iβ from the marginal current Iα of the difference between the usage current detected by the ammeter 29 and the contracted capacity stored in the contracted capacity storage unit 25. Then, the current information (alarm level) is determined by comparing the practical margin current Iγ with a predetermined threshold value. Similarly to the case of the third embodiment shown in FIG. 3, the target value calculation unit 27 calculates the current target value Ir in consideration of the current information from the current information calculation unit 30 and charges the battery 12. When this is done, the current target value Ir set in the setting device 18 is updated. The transmission unit 28 transmits the current target value Ir calculated by the target value calculation unit 27 and the current information calculated by the current information calculation unit 30 to the reception unit 26 of the electric vehicle side charging device 15A.

  In the receiving unit 26 of the electric vehicle side charging device 15A, the current target value Ir transmitted from the transmitting unit 28 of the general customer side charging device 15B is set in the setting device 18, and the current information transmitted from the transmitting unit 28 is set as the current. The information is displayed on the information display unit 31.

  In the above description, the case where the current information display unit 31 is provided in the electric vehicle side charging device 15A has been described, but the current information display unit 31 may be provided in the general consumer side charging device 15B. Moreover, you may make it provide the electric current information display part 31 in both the electric vehicle side charging device 15A and the general consumer side charging device 15B. Thereby, electric current information (alarm level) can be grasped | ascertained appropriately by the electric vehicle side and the general consumer side.

  According to the seventh embodiment of the present invention, the receiving unit 26 of the electric vehicle side charging device 15A is configured such that the usage current Iu detected by the ammeter 29 that detects the usage current of the general consumer is determined by the general consumer and the power supply company. Since the current target value Ir in a range not exceeding the contract capacity determined by the contract with the data is received and output to the setting device 18, the use current Iu of the general consumer is equal to the contract capacity as in the third embodiment shown in FIG. The battery 12 of the electric vehicle 11 can be charged within a range not exceeding. As a result, it is possible to prevent the breaker from being opened due to exceeding the contract capacity, and the electric vehicle can be normally charged without increasing the contract capacity.

  Also, the current information calculating unit 30 monitors the usage current that changes every moment, and the marginal current of the difference between the usage current received by the receiving unit 26 of the electric vehicle side charging device 15A and the contracted capacity stored in the contracted capacity storage unit 25. Is calculated and displayed on the current information display unit 31, so that the current information (alarm level) can be properly grasped. Moreover, since the contract capacity storage unit 25, the target value calculation unit 27, and the current information calculation unit 30 are provided on the general consumer side instead of the electric vehicle side charging device 15A, the electric vehicle side charging device 15A can be simplified.

  In the above description, the case where the battery 12 of the electric vehicle 11 is charged has been described. However, the power converter 17 has a function of converting the DC power stored in the battery 12 of the electric vehicle into AC power, AC power may be supplied from the battery 12 to the dedicated outlet 13. In this case, the current target value set in the setting device 18 is large in discharge current so that the power supplied from the battery 12 of the electric vehicle increases when the power consumed by the general consumer is large, contrary to the case of charging. Set. In this case, the target current value of the discharge current is set in a range from the maximum current Imax (for example, 15 A) to the zero current I0 (0 A).

  FIG. 8 is a flowchart showing an example of a method for charging an electric vehicle according to the eighth embodiment of the present invention. First, the current used by general consumers is detected (S1). The current consumption of general consumers is detected by an ammeter 29. Next, a current target value is calculated (S2). The current target value is calculated in a range in which the used current detected by the ammeter 29 does not exceed the contracted capacity determined by the contract between the general consumer and the power supply company. In the eighth embodiment, for example, as described in the second embodiment, a target current value that takes into account the allowable power fluctuation Iβ is calculated.

  Next, the charging current is detected (S3). That is, the charging current supplied from the plug 14 that is inserted into the general outlet 13 of the general consumer and receives AC power is detected. Then, the battery 12 is charged so that the charging current becomes the current target value (S4). The charging current is a charging current supplied from the plug 14. The power conversion device 17 that converts AC power into DC power is controlled so that the charging current becomes a current target value, and the battery 12 of the electric vehicle 11 is DC-connected. Charge the power. Thereby, the charging current supplied from the plug 14 can be maintained at the current target value. Therefore, it is possible to prevent the breaker from being opened when the contract capacity is exceeded. Therefore, normal charging of the electric vehicle can be performed without increasing the contract capacity.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 11 ... Electric vehicle, 12 ... Battery, 13 ... Dedicated outlet, 14 ... Plug, 15 ... Charger, 16 ... Power receiving port, 17 ... Power converter, 18 ... Setting device, 19 ... Control part, 20 ... Temperature detector, DESCRIPTION OF SYMBOLS 21 ... DC ammeter, 22 ... DC voltmeter, 23 ... AC ammeter, 24 ... AC voltmeter, 25 ... Contract capacity memory | storage part, 26 ... Receiving part, 27 ... Target value calculation part, 28 ... Transmission part, 29 ... Current Total 30 ... Current calculation unit 31 ... Current information display unit

Claims (9)

A power converter for converting AC power received by a plug for receiving AC power into a dedicated outlet for general consumers to convert DC power into DC power and charging DC power to a battery of an electric vehicle;
From the maximum current that can be received at the dedicated outlet of the general consumer to zero current, a setter that can be set as a current target value when charging the electric vehicle,
A control unit that controls the power converter so that a charging current supplied from the plug when charging the battery becomes a current target value set by the setter;
A charging device for an electric vehicle, comprising:   The charging device for an electric vehicle according to claim 2, wherein the setting device can set a current target value of a discrete value from a maximum current that can be received at a dedicated outlet of a general consumer to zero current. A contract capacity storage unit for storing a contract capacity determined by a contract between the general consumer and the power supply company;
A receiving unit that receives a used current detected by an ammeter that detects a used current of the general consumer;
Based on the usage current received by the receiving unit and the contracted capacity stored in the contracted capacity storage unit, a current target value in a range where the usage current of the general consumer does not exceed the contracted capacity when the battery is charged is calculated. A target value calculation unit set in the setting device;
The charging device for an electric vehicle according to claim 1 or 2, further comprising:   4. The electric vehicle according to claim 3, further comprising a current information calculation unit configured to calculate and display current information corresponding to a margin current of a difference between the use current received by the reception unit and the contracted capacity. Charging device.   The target value calculation unit calculates a current target value taking into account the current information calculated by the current information calculation unit, and updates the current target value set in the setting device. Electric vehicle charging device.   The contract capacity storage unit and the target value calculation unit are provided on the general consumer side, the current target value calculated by the target value calculation unit is transmitted from the transmission unit to the reception unit, and the reception unit receives The electric vehicle charging device according to claim 3, wherein a current target value is output to the setter.   The contract capacity storage unit and the current information calculation unit are provided on the general consumer side, the current information calculated by the current information calculation unit is transmitted from the transmission unit to the reception unit, and the reception unit receives the received current. 6. The charging device for an electric vehicle according to claim 4, wherein information is displayed on the current information display unit.   The contract capacity storage unit, the target value calculation unit, and the current information calculation unit are provided on the general consumer side, and the current target value and the current information calculated by the target value calculation unit are transmitted from the transmission unit to the reception unit. The electric vehicle charging device according to claim 4 or 5, wherein the receiving unit outputs the received current target value to the setter, and outputs the received current information. Detect with an ammeter that detects the current used by general consumers,
Calculate a current target value in a range where the use current detected by the ammeter does not exceed the contracted capacity determined by the contract between the general consumer and the power supply company,
Detecting a charging current supplied from a plug that is plugged into the general consumer's dedicated outlet and receives AC power,
Controlling a power conversion device that converts the AC power into DC power so that a charging current supplied from the plug becomes the calculated current target value, and charging the battery of the electric vehicle with DC power. To charge an electric vehicle.

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