JP5978475B2 - Charger - Google Patents

Description

  The present invention relates to a charging device mainly used for charging plug-in hybrid vehicles, electric vehicles and the like (hereinafter referred to as vehicles).

  The vehicle charging control is performed by receiving and transmitting a charging control signal called a CPLT signal between the charging device and the vehicle. The CPLT signal is a pilot signal having a duty set according to the magnitude of the rated current of the charging device, and notifies the vehicle of the connection state and the rated current of the charging device between the vehicle and the charging device.

  Since the vehicle is charged through a branch line that branches the bus drawn from the external power supply into the distribution board, the general load (load other than the vehicle) that supplies power from other branch lines is used. When the power consumption increases and the difference between the contract power and the power consumption of the general load becomes less than a predetermined value, the control unit of the charging device controls the duty ratio of the CPLT signal to reduce the charging current value. (For example, patent document 1).

  The vehicle has a specification that requires that a current of a certain value (for example, 6 A) or more can be supplied from the charging device as a charging condition. When the charging current value becomes less than a predetermined value, the vehicle is charged by the charging control circuit of the vehicle. The permission switch is opened, the potential of the CPLT signal is set to 9V, and the control for opening the relay of the charging electric circuit is performed to stop the charging.

  Conventionally, when power is supplied to a vehicle at 200V, it is assumed that the difference between the contract power and the power used by the general load is a predetermined value (for example, 1.2 kVA = 200V × 6A) or more. The charging control was performed. That is, when the difference is less than a predetermined value, the control for once stopping the charging is performed, and therefore, there is a problem that the frequency of stopping the charging due to the increase in the electric power used by the general load increases, which is inconvenient.

  On the other hand, a limiter (limiter or ampere breaker) provided in the distribution board before charging is stopped once in the charging device 10 when the total power of the usage power and the charging power of the general load exceeds the contract power. There is also a problem that the power supply may be unexpectedly stopped by this function. Note that the limiter uses the line voltage (100V) to determine the value of the current flowing in the two power lines out of the three power lines and the neutral line drawn by the single-phase three-wire wiring from the external power source. ), And the total amount is regulated to regulate the contract capacity.

JP 2012-060752 A

An object of the present invention is to solve the above problems, it can be the difference between the power usage contract power and the common load is reduced, lowering the stop frequency of charging used due to an increase in power of the common load It is to provide a charging device.

The charging device of the present invention, which has been made to solve the above-mentioned problems, includes two power lines and three lead lines drawn as a neutral line from an external power source by single-phase three-wire wiring, one power line, An electric circuit changeover switch that can select any one of the neutral wires as a charging electric circuit, and a control unit that receives an external signal and performs switching control of the electric circuit changeover switch. Prior to switch switching control, reset control is performed to set the potential of the CPLT signal to 0 V, and after switching the charging circuit, the potential of the CPLT signal is returned to 12 V, and then one power line selected by the circuit switching switch Alternatively, charging power is supplied using a neutral line and the other power line as a charging path.

  According to a second aspect of the present invention, in the charging device according to the first aspect, a signal output based on a current used by the distribution board is received as an external signal, and the control unit determines whether or not charging restriction is necessary. It is characterized by.

  According to a third aspect of the present invention, in the charging device according to the first aspect, the charging circuit includes a switch for opening and closing the charging circuit on the load side of the circuit switching switch.

  According to a fourth aspect of the present invention, in the charging device according to the first aspect, the control unit limits the charging current prior to performing the switching control of the electric circuit changeover switch.

  In the present invention, even when the power used for the general load increases during charging of the vehicle and the difference between the contract power and the power used for the general load becomes small, the switching control of the electric circuit changeover switch is performed and the charging voltage is set to 200V. The charging can be continued by reducing the voltage to 100V.

  That is, when the charging voltage is lowered to 100 V, the charging power used for charging the vehicle is half that when charging at 200 V, so the difference between the contract power, which is a chargeable condition, and the power used for the general load is conventionally calculated. Can be halved. As a result, it is possible to reduce the frequency of stopping charging due to an increase in power used by the general load. Even if the charging voltage is halved, the charging current is maintained at a certain value or more, so that charging is not stopped on the vehicle side.

It is a conceptual explanatory drawing of the electric power distribution by the branch line branched from the bus line via the distribution board. It is a block diagram of the charging device of this embodiment. It is a block diagram of a control part. It is a figure which shows the relationship between the electric power of general load, and a charge restriction | limiting.

  Preferred embodiments of the present invention are shown below.

  As shown in FIG. 1, the charging device 10 of the present embodiment is connected to a branch line 3 obtained by branching a bus 2 drawn into a distribution board 1 from a system power source into a plurality of branches. The other branch lines 4, 5, 6 are connected to general loads (household loads / condominium units).

  The distribution board 1 includes a panel power measurement means for measuring the power consumption of the entire distribution board by means of CT 7 for measuring the current of the bus 2, a load power measurement means for measuring the power consumption of the general load, and contract power and general load. And a charge allowable power determination unit 8 that measures and determines the allowable power that can be used for the charging device 10 based on the power used. The charge allowable power determination unit 8 outputs the difference between the contract power and the power used by the general load as a measurement signal to the control unit 11 of the charging apparatus 10.

  As shown in FIG. 2, the two power lines 12 and the neutral line 13 are drawn into the charging device 10 from the branch line 3 of the distribution board by a single-phase three-wire wiring. In addition to the control unit 11 that performs various controls related to charging, which will be described later, an electric circuit changeover switch 14 that selects one of the power supply line 12 and the neutral line 13 as a charging electric circuit, and a charging electric circuit on the load side thereof A switch 15 for opening and closing is provided. FIG. 2 shows an example of a vehicle (so-called mode 2 vehicle) whose charging is controlled by a CPLT signal and a charging device (mode 3 charging device) corresponding to the mode 2 vehicle. The charging device is not limited to the charging device in mode 3, and may be a charging device corresponding only to a vehicle (mode 1 vehicle) that does not have a CPLT circuit.

  As shown in FIG. 3, the control unit 11 includes a determination unit 17 that transmits an opening / closing signal of the charging circuit to the switch 15 based on the CPLT signal, in addition to the CPLT circuit 16 that generates the CPLT signal. Moreover, the determination part 17 receives the measurement signal which the charge allowable power determination part 8 of the distribution board 1 outputs as an external signal, and determines the necessity of the charge limitation mentioned later. Further, the determination unit 17 switches and controls the electric circuit changeover switch 14 to change the voltage of the charging electric circuit. In a normal state where charging is not restricted, two power supply lines to which a voltage of 200 V is applied are selected as charging electric paths.

The CPLT circuit 16 generates a CPLT signal as in the prior art, and when the vehicle is not connected, the potential of the CPLT signal (potential at the point A in FIG. 2 = potential of the connector connecting portion to the vehicle) is 12V by the internal resistance R1. When the vehicle is connected, the voltage is divided by the vehicle internal resistance R2 and adjusted to a constant voltage of 9V. The CPLT circuit 16 generates a CPLT signal with a duty ratio corresponding to the rated current of the charging device, and defines a charging current that can be supplied to the vehicle.

The determination unit 17 constantly detects the potential of the CPLT signal output from the CPLT circuit 16, and the vehicle charging device side can be charged (conditions such as no timer control and power that can be used for the charging device are less than allowable power). If so, the CPLT signal is oscillated (9 V oscillation). Subsequently, when the vehicle-side charge permission switch 21 is turned on, the CPLT signal shifts to 6 V oscillation due to the partial pressure with R3.
In this state, the determination unit 17 outputs a closing signal of the charging circuit to the switch 15 (hereinafter referred to as mode 2 control), and a voltage is applied to the charging circuit to charge the in-vehicle battery mounted on the vehicle 19. It becomes possible.

Charging current charging Denchu vehicle 19 is substantially constant (e.g., 15A), but as shown in FIG. 4, the difference between the power usage contract demand by an increase in power consumption of the common load and general load first If it becomes less than predetermined power (for example, 3.0KVA = 200V * 15A), the control part 11 will modulate the duty ratio of a CPLT signal as a 1st step charge restriction | limiting, and will limit the charging current value of a vehicle. In other words, while the charging voltage is maintained at 200V, the duty ratio of the CPLT signal is modulated in conjunction with the increase in the power usage of the general load, so that the vehicle charging power is within the difference between the contract power and the power usage of the general load. Control to keep it at a minimum.
Specifically, when the measurement signal from the charge allowable power determination unit 8 is received and the determination unit 17 determines that the first stage of charge restriction is necessary, the duty ratio of the CPLT signal is modulated and the charging current is supplied to the vehicle side. Send information to reduce. In response to this, the vehicle side suppresses the charging current within the specified current value.
As a result, the power used by the entire distribution board can be kept within the contract power.

  Thereafter, when the power used by the general load further increases and the difference between the contract power and the power used by the general load becomes less than a second predetermined power (for example, 1.2 KVA = 200 V × 6 A), the determination by the control unit 11 The unit 17 controls the electric circuit changeover switch 14 to limit the charging voltage as the second stage charging restriction.

  Hereinafter, the switching control of the electric circuit changeover switch 14, which is the second stage charging restriction, will be described in detail.

  When the determination unit 17 determines that the second-stage charge restriction is necessary based on the measurement signal output from the charge allowable power determination unit 8 of the distribution board 1, the determination unit 17 determines the CPLT signal modulated as the first-stage charge restriction. With the duty ratio temporarily stored in the memory, reset control is performed to set the potential of the CPLT signal to 0V.

  After the reset control, the determination unit 17 outputs switching control to the electric circuit changeover switch 14, and the charging electric circuit is switched from the power supply line 12 to the neutral line 13. After switching the charging circuit, control for setting the potential of the CPLT signal to a constant voltage of 12 V and mode 2 control similar to the above are performed. Further, the duty ratio of the CPLT signal is modulated to a value temporarily stored in the memory before the reset control, and charging at 100 V is resumed. In other words, the second stage charging restriction limits both the charging current and the charging voltage of the vehicle in order to maintain the duty ratio of the first stage charging restriction. Therefore, even if the charging voltage is halved, the charging current is maintained at a predetermined value at which the vehicle can be charged, so that charging is not stopped on the vehicle side.

  After that, if the power used by the general load further increases and the difference between the contract power and the power used by the general load becomes less than a third predetermined power (for example, 0.6 KVA = 100 V × 6 A), The controller 11 stops the oscillation of the CPLT signal in order to avoid the possibility that the power supply is unexpectedly stopped by the provided limiter. As a result, the charging permission switch 21 of the vehicle 19 is opened and charging is temporarily stopped.

  In the embodiment described above, the charge allowable power determination unit 8 of the distribution board 1 outputs the difference between the contract power and the power used by the general load as an external signal as a measurement signal, and the control unit 11 determines whether or not charge restriction is necessary. However, the external signal is a restriction that the chargeable power determination unit 8 of the distribution board 1 determines whether or not charge restriction is necessary, and directly instructs the charge restriction at the first stage, the charge restriction at the second stage, and the charge suspension. It may be a signal.

  When the difference between the contract power and the power used by the general load recovers to a predetermined value or more, the charge restriction is canceled in the reverse order of the above-described charge restriction. For example, when the difference between the contract power and the power used by the general load recovers to the third predetermined power or more, the control unit 11 performs the second stage charge restriction (both charge current and charge voltage are restricted). To resume charging. Further, when the electric power is recovered to the second predetermined power or higher, the control unit 11 restarts charging by limiting only the charging current of the vehicle due to the charging limitation in the first stage. That is, the control unit 11 controls the electric circuit changeover switch 14 from 100V to 200V to supply the charging voltage. Thereafter, until the first predetermined power is restored, the duty ratio of the CPLT signal is modulated stepwise to shift to charging with the rated current.

  As described above, the charging of the vehicle has a specification that requires that a current of a certain value (for example, 6 A) or more can be supplied from the charging device side, and if the charging current value becomes less than the certain value, In the charging control circuit, the charging permission switch 21 is opened, the potential of the CPLT signal is set to 9 V, control for opening the charging circuit is performed, and charging is stopped. When the charging voltage is lowered to 100V, the charging power used for charging the vehicle is half that when charging at 200V. Therefore, the difference between the contract power and the power used by the general load is reduced to half of the conventional power. Can do. Even in this case, since the duty ratio of the CPLT signal is maintained at a constant value at which the vehicle can be charged, charging is not stopped. That is, according to the present invention, it is possible to continue charging while suppressing the power consumption to half even under the condition where charging cannot be continued under the condition of the conventional charging voltage of 200V. In the present invention, the first-stage charging restriction for modulating the duty ratio of the CPLT signal to limit the charging current value of the vehicle is not essential, and only the second-stage charging restriction for limiting the charging voltage is performed. Also good. Alternatively, the charging voltage may be limited by the first stage charging restriction, and then the charging current value may be limited by the second stage charging restriction.

1 Distribution board 2 Bus 3, 4, 5, 6 Branch line 7 CT
8 Charging Allowable Power Determination Unit 9 Communication Line 10 Charging Device 11 Control Unit 12 Power Supply Line 13 Neutral Line 14 Electric Path Change Switch 15 Switch 16 CPLT Circuit 17 Determination Unit 19 Vehicle 20 Charging Control Circuit 21 Charging Permission Switch

Claims (4)

Three lead wires drawn as two power wires and neutral wires with single-phase three-wire wiring from an external power source;
An electric circuit changeover switch capable of selecting one of the power line and the neutral line as a charging electric circuit;
A control unit that receives an external signal and performs switching control of the electric circuit changeover switch,
The control unit performs a reset control to set the potential of the CPLT signal to 0 V prior to the switching control of the electric circuit changeover switch, and after switching the charging electric circuit, returns the potential of the CPLT signal to 12 V, and then changes the electric circuit changeover switch. A charging device that supplies charging power by using one power line or neutral line selected by the above and the other power line as a charging power path.   The charging device according to claim 1, wherein a signal output based on a current used by the distribution board is received as an external signal, and the control unit determines whether or not charging restriction is necessary. The charging device according to claim 1, wherein the charging circuit includes a switch that opens and closes the charging circuit on a load side of the circuit switching switch.   The charging device according to claim 1, wherein the control unit limits the charging current prior to performing switching control of the electric circuit changeover switch.

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