JP5361003B2 - Distribution board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distribution board capable of providing a sudden power failure without depending on power supply interruption means of loading apparatuses connected to the same distribution board when the loading apparatuses requiring much power are used simultaneously with charging of an charging vehicle. <P>SOLUTION: A distribution board includes current measuring means 11 measuring an used current value of the distribution board having a plurality of branch circuits and at least one of the branch circuits is used as a vehicle charging circuit 3. The distribution board, comprising allowable current calculation means 13 which calculates an allowable current value of the vehicle charging circuit 3 from the used current value measured by the current measuring means 11 and a predetermined rated current value of the distribution board, connects a charging control device 6 performing charging control on an charging vehicle to the vehicle charging circuit 3. The charging control device 6 comprises charging information change means which changes charging control information in accordance with the allowable current value calculated by the allowable current calculation means 13. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a distribution board particularly suitable for home charging of charging vehicles such as hybrid vehicles and electric vehicles.

  When charging a charging vehicle, a household charging device using a 100 / 200V commercial power source supplied to each home as a charging power source supplies power via a residential distribution board (for example, Patent Document 1). ).

  Various types of load devices used in the home are connected to the residential distribution board into which the lead-in line of the commercial power supply is drawn. When charging the charging vehicle, a large current (16 ~ 20A) will continue to be supplied, so if a load device with large power consumption is used repeatedly, a current exceeding the contracted current of each household flows to the main breaker in the distribution board, causing the main breaker to trip and causing a power failure In addition to interrupting charging of the charging vehicle, there is a problem that power supply to all load devices connected to the distribution board is stopped.

  In addition, when overuse of electricity occurs in each household, residential equipment with a power control function is used so that load equipment that has relatively little impact on daily life is temporarily stopped and power can be used effectively within the contracted capacity. An electric board, that is, a distribution board with a demand control function has been developed (for example, Patent Document 2).

  In a conventional distribution board with a demand control function, the current value is constantly monitored by the demand control device, and when power shortage occurs, the contact of the branch breaker corresponding to the load device is released according to a preset order, Although control was performed to automatically return when the current was resolved, charging vehicles were charged on a daily basis, so the power supply was stopped by frequently releasing the branch breaker contacts corresponding to various load devices. There was a problem that it was not preferable to do.

JP-A-8-33121 JP-A-5-95608

  The object of the present invention is to solve the above problems and to release the contact of the branch breaker corresponding to the load device according to a preset order when power shortage occurs as in a conventional distribution board with a demand control function. Regardless of the means, effectively avoiding the problem that the main breaker trips due to the current exceeding the contract current of each household flowing through the main breaker when the load equipment with large power consumption is used repeatedly when charging the charging vehicle. It is to provide a distribution board that can.

A distribution board according to the present invention includes a current measurement means for measuring a current value of a distribution board provided with a plurality of branch circuits, and uses at least one of the branch circuits as a vehicle charging circuit. An allowable current value of the vehicle charging circuit from a current value (B) of the distribution board measured by the current measuring means and a predetermined rated current value (A) of the distribution board determined in advance. And a charging control device for controlling charging of the charging vehicle via a charging cable is connected to the vehicle charging circuit, and the charging control is performed. The apparatus modulates the duty ratio of the pulse signal according to the allowable current value calculated by the allowable current value calculating means and outputs the charging control information as a pulse signal to the vehicle charging circuit Increase or decrease the current value A duty ratio modulation unit is provided, and according to the allowable current value calculated by the allowable current calculation unit, an increase / decrease in the amount of power supplied to the charged vehicle or a control for stopping and restarting the power supply to the charged vehicle is performed. It is characterized by.
Predetermined threshold value (A ') ≥ current value of distribution board used (B) = allowable current value of vehicle charging circuit + value obtained by subtracting predetermined load fluctuation from rated current value (A) Use current value of load other than car charging circuit

  According to a second aspect of the present invention, in the distribution board according to the first aspect, the charge control device is arranged outside the distribution board.

A distribution board according to the present invention includes a current measuring means for measuring a current value of a distribution board provided with a plurality of branch circuits, and uses at least one of the branch circuits as a vehicle charging circuit. An allowable current of the vehicle charging circuit from a current value (B) of the distribution board measured by the current measuring means and a rated current value (A) of the distribution board determined in advance. The value is the following formula (predetermined range value (A ′) ≧ current value of distribution board (B) = automobile charging for a predetermined current value obtained by subtracting a predetermined load fluctuation from the rated current value (A) An allowable current value calculating means for calculating a value satisfying the allowable current value of the circuit + the current value of the load other than the vehicle charging circuit), and the vehicle charging circuit is connected to the charging vehicle via a charging cable . Connecting a charge control device that performs charge control, the charge control device A pulse output means for outputting charge control information as a pulse signal; and a current value supplied to the vehicle charging circuit by modulating a duty ratio of the pulse signal according to the allowable current value calculated by the allowable current value calculating means A duty ratio modulation means for increasing / decreasing the power supply, and a control for stopping / resuming the power supply to the charged automobile according to the increase / decrease in the amount of power supplied to the charged automobile according to the allowable current value calculated by the allowable current calculation means By adopting the configuration, it is possible to control to increase / decrease the charging current of the charging vehicle in accordance with the operating current of other load devices of the distribution board.
That is, according to the configuration of the present invention, when a load device with large power consumption is used repeatedly when charging a charged vehicle, the problem of the main breaker tripping by temporarily limiting the charging current to the charged vehicle is effective. Can be avoided.

It is a block diagram which shows embodiment of this invention. It is a block diagram of a charge vehicle and a charge control apparatus. It is a block diagram of a current measuring device. It is a figure explaining control of allowable current.

Preferred embodiments of the present invention are shown below.
As shown in FIG. 1, the distribution board of the present invention includes a main breaker 1 and a plurality of branch breakers 2, and one of the branch circuits is connected to a mode 2 or mode 3 charging system (a vehicle at the time of charging). As a control means on the charging device side, an on-board battery for a charging vehicle that employs a control pilot circuit that includes a control pilot circuit that sends a charging control signal (CPLT signal) to the charging control unit on the vehicle side of the charging vehicle. The vehicle charging circuit 3 for supplying electric power is used. In the charging system of mode 2 or mode 3, a control pilot circuit that sends a charging control signal (CPLT signal) to the charging control unit on the vehicle side of the charging vehicle as the charging device side control means connected to the vehicle 4 during charging Is required to be included.

  The power supply to the charging vehicle 4 is performed from the commercial power source 5 through the main breaker 1 and the vehicle charging circuit 3, and the power supply amount to the charging vehicle 4 is a duty that is optimally modulated by the charge control device 6 described later. Varies according to the ratio.

  First, the exchange of the charging control signal between the charging control device 6 and the charging vehicle 4 will be described.

  As shown in FIG. 2, the charging control device 6 is installed on the load side of the branch breaker 2 provided in the vehicle charging circuit 3, and a charging cable 7 (power supply line × 2, signal line, ground) is connected when the vehicle is charged. Connected.

  As shown in FIG. 2, the charging control device 6 includes pulse output means 61. The pulse output means 61 for exchanging a charge control signal with the control circuit 41 on the vehicle 4 side oscillates a charge control signal having a predetermined duty ratio as an initial value. The initial value of the duty ratio of the charging control signal is predetermined as a unique value for each distribution board depending on the capacity of the main trunk, the type of charging cable, and the like.

  In the case of the charging vehicle 4 compatible with mode 2 or mode 3, the voltage of the charging control terminal 8 when the charging cable 7 is not connected to the vehicle is adjusted to a constant voltage of 12V. 4 is divided by the resistor 43 built in the vehicle-side control circuit 41, and the constant voltage of the charging control terminal 8 is lowered to 9V.

  If the distribution board is in a chargeable state when the charging control device 6 is connected to the charging cable 7, the pulse output means 61 of the charging control device 6 oscillates the charging control signal. That is, the charging control signal is oscillated when the difference between the rated current value of the distribution board and the current value of the main breaker measured by the current monitoring means described later is a certain value or more. Thus, when the 9V charge control signal oscillated to the charging vehicle side 4 is input, the charging permission switch 44 built in the vehicle side control circuit 41 is turned on. As a result, the voltage of the charging control signal is divided by another resistor 45 built in the vehicle-side control circuit 41 to generate 6V oscillation, and charging preparation is completed. In this state, the charging control device 6 outputs an ON signal to the relay 64 that opens and closes the charging electric circuit, and charging of the in-vehicle battery 42 is started.

  The duty ratio of the charge control signal described above can be modulated by the duty ratio modulation means 62 of the charge control device 6 which is a charge information changing means. A larger duty ratio means that a larger charging current can be supplied. The vehicle-side control circuit 41 of the charging vehicle reads the duty ratio of the charging control signal output from the pulse output means 61 and controls the charging current.

The characteristic part of this invention is demonstrated below.
As shown in FIG. 1, a current sensor 9 (hereinafter referred to as CT) is installed on the primary side (power supply side) of the main breaker 1 to measure the current value of the main breaker 1 inside the distribution board of the present invention. ing. That is, in this embodiment, the current value of the distribution board is measured as a current value flowing through the main breaker, and the current value of the main breaker 1 is input to the current measuring device 10 as an output signal of the CT 9. Note that, in a distribution board not provided with the main breaker 1, the value of the current flowing through the bus bar may be measured as the use current value of the distribution board. In addition, CT9 may be provided in each branch breaker 2, and the output signal of CT9 may be input to the current measuring device 10, and the total value may be used as the current used by the distribution board. In this case, the current value of the automobile charging circuit and the current value (C) of the load other than the automobile charging circuit can be distinguished and measured.

  As shown in FIG. 3, the current measurement device 10 includes a current measurement unit 11, a rated current registration unit 12, and an allowable current calculation unit 13, and an output signal of CT 9 is input to the current measurement unit 11. In the rated current registration means 12, the rated current value of the main breaker is registered in advance as the rated current value of the distribution board. In a distribution board not provided with a main breaker, the rated current value of the distribution board is registered. The rated current registration means 12 may be one that can be registered by a dip switch or the like, or that can register the rated current value of the distribution board from a personal computer by communication means via a network. Since the current measuring device 10 is powered from the bus bar 14 in the same manner as the branch breaker, it is preferably provided in the branch breaker mounting space as a case having the same size as the branch breaker 2.

  The allowable current calculation means 13 is a current value allowed for the vehicle charging circuit 3 based on the rated current value (A) of the main breaker 1 registered by the rated current registration means 12 and the current value (B) of the main breaker measured by CT9. Is calculated. The allowable current value is determined based on the difference between (A) and (B), and is controlled by modulating the duty ratio of the charge control signal by the duty ratio modulation means 62 of the charge control device 6.

  The graph shown in FIG. 4 is an example of a distribution board with a rated current value (A) of the main breaker 1 of 60 A. The measured main breaker current value (B), allowable current value, and current of loads other than the vehicle charging circuit. It is explanatory drawing which showed transition of the value (C). In addition, the charging current indicates that the initial value (maximum value) is set to 20A as a unique value for each distribution board due to limitations of the charging cable and the like. Note that (C) is not necessarily measured, but is shown for ease of explanation. On the other hand, the allowable current calculation means 13 calculates a value that limits the charging current with respect to the initial value when (B) reaches 55 A with a margin of 5 A taking into account load fluctuations with respect to (A). It shall be. In addition, the margin with respect to the rated current value (A) of the main breaker 1 is an example, and the numerical value can be appropriately determined according to the rated current value of the main breaker. That is, in this embodiment, the value (A) ′ obtained by subtracting the margin from the rated current value (A) of the main breaker 1 is treated as (A).

  FIG. 4 (i) shows a state in which charging is not started and the current value (C) of the load other than the vehicle charging circuit uses 25A. In (ii), charging is started, and the charging current is 20 A, which is its initial value. In this case, since (B) is 45 A including (C), the charging current is not limited, and the initial value of the allowable current value is maintained. In (iii), (C) reaches 35A, (B) becomes 55A, and the rated current value (A) of the main breaker 1 becomes 5A. Therefore, if the load fluctuation is taken into account, the main breaker 1 may trip, so the allowable current value is reduced to 15A. As a result, (B) becomes 50A, which is 5A or more lower than (A), so there is no risk of tripping. (Iv) is a case where (C) further increases, and the allowable current value is limited to 10A. (V) is a case where (C) further increases. In this case, the allowable current value is 5 A. However, in this embodiment, when the allowable current is equal to or less than a predetermined value, the allowable current value is set to 0 in consideration of charging stability. When the allowable current value becomes 0, the vehicle-side control circuit 41 stops the charging by stopping the oscillation of the charging control signal and keeping the charging control signal at a predetermined voltage or 0V. Although not shown in the figure, a car charging circuit is also provided with a CT, and the actual charging current value is measured, and the actual charging current value is subtracted from (B) to measure (C) to obtain the allowable current value. It may be determined.

Further, when (B) becomes equal to or less than a certain value, the allowable current calculation means 13 performs control to gradually recover the allowable current value. That is, even when charging is stopped by the above-described control, the charging cable is physically connected to the automobile 4, so that the duty ratio changing means restarts charging by modulating the duty ratio of the charging control signal. be able to.
For example, as shown in (vi), the difference between the measured current value (B) of the main breaker and the rated current value (A) of the main breaker 1 is 15 A or more with a margin of 5 A considering the load fluctuation, that is, When (C) becomes 40 A or less, the oscillation of the charge control signal is resumed, and the charge is resumed at an allowable current value of 10 A. Thereafter, control is performed to gradually recover the allowable current value in consideration of the actual charging current value.
That is, the allowable current calculation means 13 calculates the allowable current value so that the sum of (C) measured by subtracting the actual charging current value from (B) and the actual charging current value does not reach 55A.

The allowable current value may be determined by the ratio of (A) and (B).
In this case, the ratio of the above (A) and (B) can be controlled with an optimum value according to the rating of the distribution board.

  As described above, the distribution board according to the present invention includes the current value (B) of the main breaker that changes in accordance with the increase or decrease in power consumption in a load device other than the charging vehicle connected to the distribution board, and the main breaker. Power consumption at the time of charging a charged vehicle because the allowable current value of the vehicle charging circuit is calculated from the rated current value (A) of the vehicle and the duty ratio of the pulse signal is modulated according to the allowable current value to increase or decrease the charging current. This effectively eliminates the problem of the main breaker tripping without using the means of releasing the contact of the branch breaker corresponding to the load device and stopping the power supply to each load device when the load device with a large load is used repeatedly. It can be avoided.

  In the above embodiment, the allowable current calculation unit 13 is described as being provided in the current measurement device 10 in the above embodiment, but the present invention is not limited to this. For example, the allowable current calculation unit 13 is provided in the charge control device 6. Also good. In addition, the automobile charging circuit is connected to the secondary side of the main breaker, and may be provided in a branch circuit that is physically independent of other branch circuits, or the branch connected to the primary side of the main breaker It may be provided in the circuit. Further, the current measuring device may be provided integrally in the charging control device. Further, the charging control device and the current measuring device can be provided outside the casing of the distribution board. In this case, the current measuring device 10 may include a communication device, and information on allowable current may be given to a charging control device provided outside the distribution board.

  In the above embodiment, the charging information changing means transmits the information on the allowable current of the automobile charging circuit to the vehicle-side control circuit by modulating the duty ratio using the charging control signal of mode 2 or mode 3. However, the present invention is not limited to this, and the charging information changing unit may create a message including information on the allowable current and transmit it to the vehicle-side control circuit via the control unit.

DESCRIPTION OF SYMBOLS 1 Master breaker 2 Branch breaker 3 Car charging circuit 4 Charging automobile 41 Vehicle side control circuit 42 Vehicle-mounted battery 43 Resistance 44 Charging permission switch 45 Resistance 5 Commercial power supply 6 Charge control device 61 Pulse output means 62 Duty ratio modulation means 63 Control means 64 Relay 7 Charging cable 8 Charging control terminal 9 CT
DESCRIPTION OF SYMBOLS 10 Current measuring device 11 Current measuring means 12 Rated current registration means 13 Allowable current calculation means 14 Bus bar

Claims (2)

A distribution board comprising current measuring means for measuring a current value of a distribution board provided with a plurality of branch circuits, wherein at least one of the branch circuits is used as a vehicle charging circuit,
From the current value (B) of the distribution board measured by the current measuring means and the rated current value (A) of the distribution board determined in advance, the allowable current value of the vehicle charging circuit is expressed by the following equation: An allowable current value calculating means for calculating as a value satisfying
Connected to the vehicle charging circuit is a charging control device for controlling charging to the charging vehicle via a charging cable ,
The charging control device modulates the duty ratio of the pulse signal according to the allowable current value calculated by the allowable current value calculating means by pulse output means for outputting charging control information as a pulse signal, and for charging the vehicle A duty ratio modulation unit that increases or decreases a current value supplied to the circuit is provided. Depending on the allowable current value calculated by the allowable current calculation unit, the power supply amount to the charging vehicle is increased or decreased, or the power supply to the charging vehicle is supplied. A distribution board characterized by performing control for stopping and restarting.
Predetermined threshold value (A ') ≥ current value of distribution board used (B) = allowable current value of vehicle charging circuit + value obtained by subtracting predetermined load fluctuation from rated current value (A) Use current value of load other than car charging circuit   The distribution board according to claim 1, wherein the charging control device is arranged outside the distribution board.

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