JP5712883B2 - Charger - Google Patents

Description

  The present invention relates to a charging device that supplies electric power to a vehicle.

FIG. 5 is a diagram showing an existing charging device and vehicle.
5 includes a plurality of charging cables 52 (52-1 to 52-n), a plurality of switches 53 (53-1 to 53-n), and a plurality of CPLT communication circuits 54 (54-1). ˜54-n), and a control circuit 55 for controlling the on / off of each switch 53 and the operation of each CPLT communication circuit 54.

  For example, when the switch 53-1 is turned on, the power line (solid line) in the charging cable 52-1 and the commercial power system 56 are connected to each other. Further, when the switch 53-1 is turned off, the power line in the charging cable 52-1 and the commercial power system 56 are cut off.

  5 includes a battery 58, a bidirectional DC / AC converter 59 with a grid connection function, a CPLT communication circuit 60, and a grid connection, respectively. And a control circuit 61 that controls the operation of the bidirectional DC / AC converter 59 with functions and the operation of the CPLT communication circuit 60.

  A bidirectional DC / AC converter 59 with a grid interconnection function converts AC power supplied from the charging device 51 via a power line in the charging cable 52 into DC power, and charges the battery 58 with the converted DC power. To do. The bidirectional DC / AC converter 59 with a grid connection function converts the DC power of the battery 58 into AC power, and supplies the converted AC power to the charging device 51 via the power line in the charging cable 52. . Then, the AC power supplied to the charging device 51 is supplied to the commercial power system 56 via the switch 53. The bidirectional DC / AC converter 59 with the grid interconnection function is a function for obtaining the maximum value Vo, the frequency fo, and the phase θo of the AC voltage of the commercial power system 56, and the AC voltage of the commercial power system 56. Based on the maximum value Vo, the frequency fo, and the phase θo, the waveform of the AC voltage output from the vehicle 57 to the commercial power system 56 via the charging device 51 is the waveform of the AC voltage Vo × sin (2π of the commercial power system 56. The function of converting the DC power of the battery 58 into AC power and the AC voltage output from the vehicle 57 to the commercial power system 56 via the charging device 51 so that the same as that of × fo × t (seconds) + θo) It is assumed that a function for stopping power supply from the vehicle 57 to the charging device 51 when it is no longer the same as the AC voltage of the commercial power system 56 is provided.

  For example, when the charging cable 52-1 is connected to the vehicle 57-1, the CPLT communication circuit 60 on the vehicle 57-1 side and the CPLT communication circuit 54-1 on the charging device 51 side are within the charging cable 52-1. Are connected to each other via a signal line (dotted line), and a CPLT signal is transmitted and received. The CPLT signal indicates, for example, whether or not the charging cable 52 is connected to the vehicle 57, whether or not the battery 58 is ready for charging, and the current that can be supplied from the charging device 51 to the vehicle 57.

  For example, the control circuit 55 on the charging device 51 side turns on the switch 53 and charges the AC power of the commercial power system 56 when a signal indicating that the preparation for charging the battery 58 is completed is sent from the CPLT communication circuit 54. It is supplied to the vehicle 57 via the cable 52. At this time, the bidirectional DC / AC converter 59 with a grid connection function converts AC power supplied from the charging device 51 into DC power, and charges the battery 58 with the converted DC power.

  Further, for example, after the signal indicating that the charging cable 52 is connected to the vehicle 57 is transmitted from the CPLT communication circuit 54, the control circuit 55 transmits the signal from the vehicle 57 to the charging device 51 via the power line in the charging cable 52. When it is detected that AC power is supplied, the switch 53 is turned on, and AC power supplied from the vehicle 57 is supplied to the commercial power system 56.

  As described above, there is a technique that enables not only power supply from the charging facility such as the charging device 51 to the vehicle 57 but also power supply from the vehicle 57 to the charging facility (see, for example, Patent Documents 1 to 3).

  However, when the AC power supplied from the vehicle 57 is supplied to the commercial power grid 56, the grid interconnection function necessary for supplying the AC power to the commercial power grid 56 is provided to each vehicle 57 as described above. It is necessary to prepare, and the manufacturing cost of each vehicle 57 will be increased. Therefore, the manufacturing cost of the entire system including the charging device 51 and the vehicle 57 is increased.

JP 2007-282383 A JP 2007-330083 A JP 2002-315193 A

  An object of the present invention is to provide a charging device capable of supplying power from a commercial power system to a vehicle and supplying power from the vehicle to the commercial power system while suppressing an increase in manufacturing cost of the entire system.

The charging device of the present invention includes a plurality of charging cables, a bidirectional DC / AC converter with a grid connection function connected to a commercial power system, the bidirectional DC / AC converter with a grid connection function, and the plurality of chargings. A plurality of bidirectional DC / AC converters respectively provided between the cables, a control circuit , connection determination means for determining whether or not the charging cable is connected to the vehicle, and a signal indicating charging permission from the vehicle Permission judging means for judging whether or not a message has been sent .

When supplying power to the vehicle, the control circuit drives the bidirectional DC / AC converter with grid connection function to convert AC power of the commercial power system into DC power, and the bidirectional DC By driving the AC / AC converter, the DC power converted by the bidirectional DC / AC converter with the grid connection function is converted into AC power, supplied to the vehicle via the charging cable, and supplied from the vehicle When supplying the commercial power to the commercial power system, the bidirectional DC / AC converter is driven to convert AC power supplied from the vehicle through the charging cable into DC power, and the system By driving a bidirectional DC / AC converter with an interconnection function, it is changed by the bidirectional DC / AC converter. Supplied to the commercial power system by converting the DC power into AC power. The control circuit may determine that the signal indicating the charging permission is sent from the vehicle by the permission determining unit after the connection determining unit determines that the charging cable is connected to the vehicle. The electric power supplied from the commercial power system is supplied to the vehicle by driving the bidirectional DC / AC converter with the grid interconnection function and the bidirectional DC / AC converter, and the charging is performed by the connection determination means. After it is determined that a cable is connected to the vehicle, it is determined that a signal indicating the charging permission is not sent by the permission determining means, and it is determined that an AC voltage is applied to the charging cable. By driving the bidirectional DC / AC converter with grid connection function and the bidirectional DC / AC converter, the vehicle Supplying power et supplied to the commercial power system.

  As a result, it is not necessary to provide each vehicle with a bidirectional DC / AC converter with a grid interconnection function, so that power supply from the commercial power system to the vehicle can be achieved while suppressing the manufacturing cost of the entire system including the charging device and each vehicle. And can supply power from the vehicle to the commercial power system.

  According to the charging device of the present invention, it is possible to supply power from the commercial power system to the vehicle and supply power from the vehicle to the commercial power system while suppressing the manufacturing cost of the entire system.

It is a figure which shows the charging device and vehicle of embodiment of this invention. It is a figure which shows an example of a CPLT signal. It is a figure which shows the circuit example of the bidirectional | two-way DC / AC converter with a grid connection function of this embodiment. It is a flowchart which shows operation | movement of the control circuit by the side of a charging device. It is a figure which shows the existing charging device and a vehicle.

FIG. 1 is a diagram illustrating a charging device and a vehicle according to an embodiment of the present invention.
The charging device 1 shown in FIG. 1 includes a plurality of charging cables 2 (2-1 to 2-n), a plurality of switches 3 (3-1 to 3-n), and a plurality of CPLT communication circuits 4 (4-1). ˜4-n) (connection determination means, permission determination means), a plurality of bidirectional DC / AC converters 5 (5-1 to 5-n), a bidirectional DC / AC converter 6 with a grid interconnection function, ON / OFF of each of the battery 7 and each switch 3, each operation of each CPLT communication circuit 4, each drive of each bidirectional DC / AC converter 5, and bidirectional DC / AC converter 6 with a system interconnection function And a control circuit 8 for controlling the driving of. The control circuit 8 includes, for example, a processor and a memory, and the processor executes a power supply control program stored in the memory, thereby supplying power from the commercial power system 9 to the vehicle 10 or from the vehicle 10 to the commercial power system 9. Control related to power supply to

The bidirectional DC / AC converter 6 with the grid connection function is connected to the commercial power grid 9.
Each bidirectional DC / AC converter 5 is connected to a battery 7. In addition, the bidirectional DC / AC converter 5-1 is provided between the bidirectional DC / AC converter 6 with a system interconnection function and the charging cable 2-1 via the switch 3-1, and the bidirectional DC / AC converter. 5-2 is provided between the bidirectional DC / AC converter 6 with the grid connection function and the charging cable 2-2 via the switch 3-2, ..., the bidirectional DC / AC converter 5-n It is provided between the bidirectional DC / AC converter 6 with the grid connection function and the charging cable 2-n via the switch 3-n.

  For example, when the switch 3-1 is turned on, the power line (solid line) in the charging cable 2-1 and the bidirectional DC / AC converter 5-1 are connected to each other, and when the switch 3-2 is turned on, the charging cable 2-2 When the switch 3-n is turned on, the power line in the charging cable 2-n and the bidirectional DC / AC converter 5-n are connected to each other. Are connected to each other. Further, when the switch 3-1 is turned off, the power line in the charging cable 2-1 and the bidirectional DC / AC converter 5-1 are disconnected, and when the switch 3-2 is turned off, the power line in the charging cable 2-2 is disconnected. When bidirectional DC / AC converter 5-2 is disconnected and switch 3-n is turned off, the power line in charging cable 2-n and bidirectional DC / AC converter 5-n are disconnected.

  The signal line (dotted line) in the charging cable 2-1 is connected to the CPLT communication circuit 4-1, the signal line in the charging cable 2-2 is connected to the CPLT communication circuit 4-2,... A signal line in the cable 2-n is connected to the CPLT communication circuit 4-n.

  Further, each of the plurality of vehicles 10 (10-1 to 10-n) illustrated in FIG. 1 is, for example, a hybrid vehicle or an electric vehicle, and includes a battery 11, a bidirectional DC / AC converter 12, and CPLT communication. A circuit 13 and a control circuit 14 for controlling the driving of the bidirectional DC / AC converter 12 and the operation of the CPLT communication circuit 13 are provided.

  The bidirectional DC / AC converter 12 converts AC power supplied from the charging device 1 through the power line in the charging cable 2 into DC power, and charges the battery 11 with the converted DC power. The bidirectional DC / AC converter 12 converts the DC power of the battery 11 into AC power, and supplies the converted AC power to the charging device 1 via the power line in the charging cable 2.

  For example, when the charging cable 2-1 is connected to the vehicle 10-1, the CPLT communication circuit 13 on the vehicle 10-1 side and the CPLT communication circuit 4-1 on the charging device 1 side are within the charging cable 2-1. Are connected to each other via a signal line, and a CPLT signal is transmitted and received. The CPLT signal indicates, for example, whether or not the charging cable 2 is connected to the vehicle 10, whether or not the battery 11 is ready for charging, and the current that can be supplied from the charging device 1 to the vehicle 10.

FIG. 2 is a diagram illustrating an example of a CPLT signal.
First, when the charging cable 2 is connected to the vehicle 10 by the user (time t1), the level of the CPLT signal (the voltage of the communication line in the charging cable 2) changes from V1 (for example, +12 [V]) to V2 (for example, +9 [V]). Then, the CPLT communication circuit 4 on the charging device 1 side determines that the charging cable 2 is connected to the vehicle 10.

  Next, when the level of the CPLT signal is changed from V1 to V2, the CPLT communication circuit 4 on the charging device 1 side has an amplitude having a magnitude of −V1 (for example, −12 [V]) to V2 and a commercial power system. The CPLT signal is oscillated so as to be a pulse wave having a duty ratio determined by the rated current of 9 or the type of the charging cable 2. The CPLT communication circuit 13 on the vehicle 10 side prepares for charging based on the duty ratio of the CPLT signal at this time.

  Next, when the CPLT communication circuit 13 on the vehicle 10 side is ready for charging based on the duty ratio of the CPLT signal (time t2), the CPLT signal indicates that charging is permitted, that is, the amplitude of the CPLT signal is increased. -V1 to V3 (for example, +6 [V]). Then, an instruction to start power supply to the vehicle 10 is sent from the CPLT communication circuit 4 on the charging device 1 side to the control circuit 8, and power is supplied from the charging device 1 to the vehicle 10 through the power line in the charging cable 2. 11 charging is started.

When the charging of the battery 11 is completed and the charging cable 2 is removed from the vehicle 10 (time t3), the level of the CPLT signal returns to V1.
In the present embodiment, the vehicle 10 indicates that the charging is permitted by the CPLT signal from the vehicle 10 to the charging device 1, but the wireless communication indicates that the charging is permitted from the vehicle 10 to the charging device 1. It may be configured. When comprised in this way, the charging apparatus 1 and the vehicle 10 are each equipped with the communication apparatus as a permission judgment means.

  FIG. 3 is a diagram illustrating a circuit example of the bidirectional DC / AC converter 6 with a grid interconnection function. The bidirectional DC / AC converters 5 and 12 have the same circuit configuration as that of the bidirectional DC / AC converter 6 with a system interconnection function.

  A bidirectional DC / AC converter 6 with a grid interconnection function shown in FIG. 3 includes full bridge inverter circuits 25 to 27 having MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) 21 to 24, a transformer 28, capacitors 29 to 31, Inductors 32 to 34 and a control circuit 35 are provided. The four switching elements constituting the full-bridge inverter circuits 25 to 27 are not limited to MOSFETs, and for example, bipolar transistors in which diodes are connected in parallel or IGBTs (Insulated Gate Bipolar Transistors) may be employed. . The terminals 36 and 37 of the bidirectional DC / AC converter 6 with the grid connection function are connected to the commercial power system 9, and the terminals 38 and 39 of the bidirectional DC / AC converter 6 with the grid connection function are bidirectional DC / AC. It is assumed that the AC converter 5 is connected to terminals 38 and 39 and the battery 7. Further, it is assumed that the terminals 36 and 37 of the bidirectional DC / AC converter 5 are connected to the switch 3. The terminals 36 and 37 of the bidirectional DC / AC converter 12 are connected to a power line in the charging cable 2 when the charging cable 2 and the vehicle 10 are connected. The terminals 38 and 39 of the bidirectional DC / AC converter 12 are It is assumed that the battery 11 is connected.

  Here, when power is supplied from the commercial power system 9 to the vehicle 10 (hereinafter referred to as DC / AC mode), the bidirectional DC / AC converter 6 with the system interconnection function and the bidirectional DC / AC converters 5 and 12 are connected. Each operation control will be described.

First, operation control of the bidirectional DC / AC converter 6 with a grid interconnection function will be described.
Based on the voltage Va applied to the capacitor 31 and the voltage Vb applied to the capacitor 30, the control circuit 35, the MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full-bridge inverter circuit 27, so that the AC power of the commercial power system 9 is rectified. Are alternately turned on and off. Further, the control circuit 35 converts the DC power converted by the full bridge inverter circuit 27 into AC power based on the voltage Vb and the voltage Vc applied to the capacitor 29, so that the MOSFETs 21 and 24 of the full bridge inverter circuit 26 are converted. And MOSFETs 22 and 23 are alternately turned on and off. Further, the control circuit 35 synchronizes with the on / off of the MOSFETs 21 to 24 of the full bridge inverter circuit 26, while the AC power output from the full bridge inverter circuit 26 and input to the full bridge inverter circuit 25 through the transformer 28 is received. The MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full bridge inverter circuit 25 are alternately turned on and off so as to be rectified. Then, the power rectified by the full bridge inverter circuit 25 is smoothed by the capacitor 29 and output to the bidirectional DC / AC converter 5.

Next, operation control of the bidirectional DC / AC converter 5 will be described.
Based on the voltages Vb and Vc, the control circuit 35 is connected to the MOSFETs 21 and 24 of the full-bridge inverter circuit 25 so that the power output from the bidirectional DC / AC converter 6 with a grid connection function is converted into AC power. The MOSFETs 22 and 23 are alternately turned on and off. In addition, the control circuit 35 synchronizes with the ON / OFF of the MOSFETs 21 to 24 of the full bridge inverter circuit 25, while the AC power output from the full bridge inverter circuit 25 and input to the full bridge inverter circuit 26 through the transformer 28 is received. The MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full bridge inverter circuit 26 are alternately turned on and off so as to be rectified. In addition, the control circuit 35 is configured so that the electric power rectified by the full bridge inverter circuit 26 and smoothed by the capacitor 30 is converted into AC power based on the voltages Va and Vc, and a desired AC voltage is applied to the capacitor 31. The MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the bridge inverter circuit 27 are alternately turned on and off. Then, the AC power converted by the full bridge inverter circuit 27 is supplied to the vehicle 10 via the inductors 33 and 34 and the capacitor 31.

Next, operation control of the bidirectional DC / AC converter 12 will be described.
The control circuit 35 alternately turns on and off the MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full-bridge inverter circuit 27 so that the AC power supplied from the charging device 1 is rectified based on the voltages Va and Vb. . Further, the control circuit 35 is connected to the MOSFETs 21 and 24 of the full-bridge inverter circuit 26 so that the power rectified by the full-bridge inverter circuit 27 and smoothed by the capacitor 30 is converted into AC power based on the voltages Vb and Vc. The MOSFETs 22 and 23 are alternately turned on and off. Further, the control circuit 35 synchronizes with the on / off of the MOSFETs 21 to 24 of the full bridge inverter circuit 26, while the AC power output from the full bridge inverter circuit 26 and input to the full bridge inverter circuit 25 through the transformer 28 is received. The MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full bridge inverter circuit 25 are alternately turned on and off so as to be rectified. The power rectified by the full bridge inverter circuit 25 is smoothed by the capacitor 29 and supplied to the battery 11 to charge the battery 11.

  Next, when power is supplied from the vehicle 10 to the commercial power grid 9 (hereinafter referred to as AC / DC mode), the bidirectional DC / AC converter 6 with the grid interconnection function and the bidirectional DC / AC converters 5 and 12 are connected. Each operation control will be described.

First, operation control of the bidirectional DC / AC converter 12 will be described.
Based on the voltages Vb and Vc, the control circuit 35 alternately turns on and off the MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full bridge inverter circuit 25 so that the DC power of the battery 11 is converted into AC power. In addition, the control circuit 35 synchronizes with the ON / OFF of the MOSFETs 21 to 24 of the full bridge inverter circuit 25, while the AC power output from the full bridge inverter circuit 25 and input to the full bridge inverter circuit 26 through the transformer 28 is received. The MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full bridge inverter circuit 26 are alternately turned on and off so as to be rectified. In addition, the control circuit 35 is connected to the MOSFETs 21 and 24 of the full-bridge inverter circuit 27 so that the power output from the full-bridge inverter circuit 26 and smoothed by the capacitor 30 is converted into AC power based on the voltages Va and Vb. The MOSFETs 22 and 23 are alternately turned on and off. The AC power converted by the full bridge inverter circuit 27 is supplied to the charging device 1 via the inductors 33 and 34 and the capacitor 31.

Next, operation control of the bidirectional DC / AC converter 5 will be described.
The control circuit 35 alternately turns on and off the MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full bridge inverter circuit 27 so that the AC power supplied from the vehicle 10 is rectified based on the voltages Va and Vb. Further, the control circuit 35 is connected to the MOSFETs 21 and 24 of the full-bridge inverter circuit 26 so that the electric power output from the full-bridge inverter circuit 27 and smoothed by the capacitor 30 is converted into AC power based on the voltages Vb and Vc. The MOSFETs 22 and 23 are alternately turned on and off. Further, the control circuit 35 synchronizes with the on / off of the MOSFETs 21 to 24 of the full bridge inverter circuit 26, while the AC power output from the full bridge inverter circuit 26 and input to the full bridge inverter circuit 25 through the transformer 28 is received. The MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full bridge inverter circuit 25 are alternately turned on and off so as to be rectified. Then, the power rectified by the full bridge inverter circuit 25 is smoothed by the capacitor 29 and output to the bidirectional DC / AC converter 6 with a system interconnection function.

Next, operation control of the bidirectional DC / AC converter 6 with a grid interconnection function will be described.
The control circuit 35 connects the MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full-bridge inverter circuit 25 so that the power output from the bidirectional DC / AC converter 5 is converted into AC power based on the voltages Vb and Vc. Turn on and off alternately. In addition, the control circuit 35 synchronizes with the ON / OFF of the MOSFETs 21 to 24 of the full bridge inverter circuit 25, while the AC power output from the full bridge inverter circuit 25 and input to the full bridge inverter circuit 26 through the transformer 28 is received. The MOSFETs 21 and 24 and the MOSFETs 22 and 23 of the full bridge inverter circuit 26 are alternately turned on and off so as to be rectified. In addition, the control circuit 35 is connected to the MOSFETs 21 and 24 of the full-bridge inverter circuit 27 so that the power output from the full-bridge inverter circuit 26 and smoothed by the capacitor 30 is converted into AC power based on the voltages Va and Vb. The MOSFETs 22 and 23 are alternately turned on and off. The AC power converted by the full bridge inverter circuit 27 is supplied to the commercial power system 9 via the inductors 33 and 34 and the capacitor 31. At this time, the control circuit 35 sets the full bridge so that the maximum value, frequency, and phase of the AC voltage applied to the capacitor 31 are the same as the maximum value Vo, frequency fo, and phase θo of the AC voltage of the commercial power system 9. The duty of the MOSFETs 21 to 24 of the inverter circuits 25 to 27 is controlled. Note that the maximum value of the AC voltage applied to the capacitor 31 may be larger than the maximum value Vo of the AC voltage of the commercial power system 9. Thereby, the waveform V1 × sin (2π × f1 × t + θ1) of the AC voltage applied to the charging cable 2-1, the waveform V2 × sin (2π × f2 × t + θ2) of the AC voltage applied to the charging cable 2-2,. The AC voltage waveform Vn × sin (2π × f2 × t + θn) applied to the charging cable 2-n is not aligned with each other, or the AC voltage waveform Vo × sin (2π × fo × t + θo) of the commercial power system 9 Even if they are different, the electric power supplied from the vehicles 10-1 to 10-n can be supplied to the commercial power system 9 via the charging device 1.

FIG. 4 is a flowchart showing the operation of the control circuit 8 on the charging device 1 side.
First, when the control circuit 8 receives a CPLT signal indicating that the charging cable 2 is connected to the vehicle 10 from any one of the plurality of CPLT communication circuits 4 ( If S1 is Yes), it is determined whether or not a CPLT signal indicating charging permission has been received from the CPLT communication circuit 4 (S2).

  When it is determined that a CPLT signal indicating charging permission has been received (S2 is Yes), the control circuit 8 turns on the switch 3 and power from the commercial power system 9 to the vehicle 10 in the DC / AC mode. Is started to drive the bidirectional DC / AC converter 5 and the bidirectional DC / AC converter 6 with a grid interconnection function (S3).

  Next, the control circuit 8 inputs and outputs the input / output voltages (input DC voltage and output AC voltage) of the bidirectional DC / AC converter 5 corresponding to the CPLT communication circuit 4 that has transmitted that the CPLT signal indicating permission of charging has been received. It is determined whether or not at least one of the alternating currents (charging currents) flowing from the device 1 to the vehicle 10 is a desired value (S4). For example, the control circuit 8 determines whether or not the detection values of the current sensors that detect the voltages Va and Vc output from the bidirectional DC / AC converter 5 and the current flowing through the power line in the charging cable 2 are desired values. to decide.

  When it is determined that at least one of the input / output voltage of the bidirectional DC / AC converter 5 and the alternating current flowing from the charging device 1 to the vehicle 10 is not a desired value (S4 is No), the control circuit 8 switches the switch 3 While the power is turned off, the driving of the bidirectional DC / AC converter 5 and the bidirectional DC / AC converter 6 with a system interconnection function is stopped (S5). Thereby, the power supply to the vehicle 10 is stopped.

  On the other hand, when it is determined that at least one of the input / output voltage of the bidirectional DC / AC converter 5 and the alternating current flowing from the charging device 1 to the vehicle 10 is a desired value (S4 is Yes), the control circuit 8 It is determined whether or not the CPLT communication circuit 4 has transmitted that the charging has been completed or the CPLT signal indicating that the charging cable 2 has been disconnected from the vehicle 10 (S6).

  When it is determined that the CPLT signal indicating that the charging is finished or the charging cable 2 is disconnected from the vehicle 10 has not been sent (No in S6), the control circuit 8 returns to S4, and both It is determined whether at least one of the input / output voltage of the directional DC / AC converter 5 and the alternating current flowing from the charging device 1 to the vehicle 10 is a desired value.

  On the other hand, when it is determined that the CPLT signal indicating that the charging is finished or the charging cable 2 is disconnected from the vehicle 10 has been received (S6 is Yes), the control circuit 8 proceeds to S5, and the switch 3 is turned off, and driving of the bidirectional DC / AC converter 5 and the bidirectional DC / AC converter 6 with a grid interconnection function is stopped.

  If control circuit 8 determines that it has not been sent that a CPLT signal indicating charging permission has been received (No in S2), it determines whether or not an AC voltage is applied to the power line in charging cable 2. (S7).

  When it is determined that an AC voltage is applied to the power line in the charging cable 2 (Yes in S7), the control circuit 8 turns on the switch 3 and the power supplied from the vehicle 10 in the AC / DC mode is commercial. The bi-directional DC / AC converter 5 and the bi-directional DC / AC converter 6 with a grid interconnection function are started to be supplied to the power system 9 (S8).

  Next, the control circuit 8 includes an input / output voltage (input DC voltage and output AC voltage) of the bidirectional DC / AC converter 6 with a grid connection function and an AC current (discharge current) flowing from the vehicle 10 to the charging device 1. It is determined whether at least one of the values is a desired value (S9). For example, in the control circuit 8, the detection values of the current sensors that detect the voltages Va and Vc output from the bidirectional DC / AC converter 6 with the grid connection function and the current flowing in the power line in the charging cable 2 are the desired values. Judge whether there is.

  When it is determined that at least one of the input / output voltage of the bidirectional DC / AC converter 6 with the grid interconnection function and the alternating current flowing from the vehicle 10 to the charging device 1 is not a desired value (No in S9), the control circuit 8 Turns off the switch 3 and stops the driving of the bidirectional DC / AC converter 5 and the bidirectional DC / AC converter 6 with the grid connection function (S10). Thereby, the power supply to the commercial power system 9 is stopped.

  On the other hand, when it is determined that at least one of the input / output voltage of the bidirectional DC / AC converter 6 with the grid interconnection function and the alternating current flowing from the vehicle 10 to the charging device 1 is a desired value (Yes in S9), The control circuit 8 has received a CPLT signal indicating whether or not the power supply from the vehicle 10 to the charging device 1 has been stopped (whether or not the discharge has been completed) or that the charging cable 2 has been disconnected from the vehicle 10. Is sent from the CPLT communication circuit 4 (S11). The control circuit 8 may determine whether or not the power supply from the vehicle 10 to the charging device 1 has been stopped based on the detection value of the current sensor that detects the current flowing through the power line in the charging cable 2. .

  When it is determined that the power supply from the vehicle 10 to the charging device 1 is not stopped, or when it is determined that the CPLT signal indicating that the charging cable 2 is disconnected from the vehicle 10 has not been sent. (S11 is No), the control circuit 8 returns to S9, and at least one of the input / output voltage of the bidirectional DC / AC converter 6 with the grid connection function and the alternating current flowing from the vehicle 10 to the charging device 1 is desired. Determine whether it is a value.

  On the other hand, when it is determined that the power supply from the vehicle 10 to the charging device 1 has stopped, or that a CPLT signal indicating that the charging cable 2 has been disconnected from the vehicle 10 has been received from the CPLT communication circuit 4 has been sent. If it is determined (Yes in S11), the control circuit 8 proceeds to S10, turns off the switch 3, and stops driving the bidirectional DC / AC converter 5 and the bidirectional DC / AC converter 6 with the grid connection function. .

  When the control circuit 8 determines that no AC voltage is applied to the power line in the charging cable 2 (No in S7), it indicates that the CPLT signal indicating that the charging cable 2 has been disconnected from the vehicle 10 has been received. It is determined whether or not it has been sent from the CPLT communication circuit 4 (S12).

  When it is determined that the CPLT signal indicating that the charging cable 2 has been disconnected from the vehicle 10 has been received (Yes in S12), the control circuit 8 performs on / off control of the switch 3 or bidirectional DC / The drive control of the AC converter 5 and the bidirectional DC / AC converter 6 with the grid interconnection function is terminated.

  On the other hand, when it is determined that the CPLT signal indicating that the charging cable 2 has been disconnected from the vehicle 10 has not been sent (No in S12), the control circuit 8 returns to S2 and CPLT indicating charging permission It is determined whether or not a signal has been received.

  As described above, the charging device 1 of the present embodiment converts the bidirectional DC / AC converter 5 that converts electric power supplied from the vehicle 10 into direct-current power and the converted direct-current power into alternating-current power, thereby converting the commercial power system. Since the bidirectional DC / AC converter 6 with the grid connection function supplied to the vehicle 9 is provided, it is not necessary to provide each vehicle 10 with the bidirectional DC / AC converter with the grid connection function. Accordingly, it is possible to supply power from the commercial power system 9 to the vehicle 10 and supply power from the vehicle 10 to the commercial power system 9 while suppressing the manufacturing cost of the entire system including the charging device 1 and the vehicle 10.

  In the above embodiment, the electric power supplied from the vehicle 10 to the charging device 1 is supplied to the commercial power system 9 as it is. However, the electric power supplied from the vehicle 10 to the charging device 1 temporarily causes the charging device 1 to You may comprise so that the battery 7 may be charged and the electric power of the battery 7 may be supplied to the commercial power grid 9 after that.

  For example, the control circuit 8 drives the bidirectional DC / AC converter 5 to convert AC power supplied from the vehicle 10 into DC power, and charges the battery 7 with the DC power. Thereafter, the control circuit 8 drives the bidirectional DC / AC converter 6 with a grid interconnection function to convert the DC power of the battery 7 into AC power and supply it to the commercial power system 9.

  Moreover, in the said embodiment, although it is the structure by which the electric power supplied from the vehicle 10 to the charging device 1 is supplied to the commercial power system 9 or the battery 7, the electric power supplied from the certain vehicle 10 to the charging device 1 You may comprise so that it may supply to the vehicle 10. FIG.

  For example, the control circuit 8 drives the bidirectional DC / AC converter 5-1 to convert AC power supplied from the vehicle 10-1 into DC power, and the bidirectional DC / AC converter 5-2. By driving, the DC power output from the bidirectional DC / AC converter 5-1 is converted into AC power and supplied to the vehicle 10-2.

Alternatively, the battery 7 of the charging device 1 may be charged with the power supplied from a certain vehicle 10 to the charging device 1, and then the power of the battery 7 may be supplied to another vehicle 10.
For example, the control circuit 8 drives the bidirectional DC / AC converter 5-1 to convert AC power supplied from the vehicle 10-1 into DC power, and charges the battery 7 with the DC power. Thereafter, the control circuit 8 drives the bidirectional DC / AC converter 5-2 to convert the DC power of the battery 7 into AC power and supply the AC power to the vehicle 10-2.

  Moreover, in the said embodiment, although the battery 7 is the structure provided in the charging device 1, you may provide the battery 7 in the exterior of the charging device 1. FIG.

DESCRIPTION OF SYMBOLS 1 Charging device 2 Charging cable 3 Switch 4 CPLT communication circuit 5 Bidirectional DC / AC converter 6 Bidirectional DC / AC converter with system interconnection function 7 Battery 8 Control circuit 9 Commercial power system 10 Vehicle 11 Battery 12 Bidirectional DC / AC Converter 13 CPLT communication circuit 14 Control circuit

Claims (4)

Multiple charging cables,
A bidirectional DC / AC converter with a grid connection function connected to a commercial power system;
A plurality of bidirectional DC / AC converters respectively provided between the bidirectional DC / AC converter with grid connection function and the plurality of charging cables;
When power is supplied to the vehicle, the bidirectional DC / AC converter with grid connection function is driven to convert the AC power of the commercial power system into DC power, and the bidirectional DC / AC converter is driven. By converting the direct current power converted by the bidirectional DC / AC converter with the grid connection function into alternating current power and supplying it to the vehicle via the charging cable, the electric power supplied from the vehicle is When supplying to a commercial power system, the bidirectional DC / AC converter is driven to convert AC power supplied from the vehicle via the charging cable into DC power, and both with the grid connection function DC power converted by the bidirectional DC / AC converter by driving the DC / AC converter A control circuit for supplying to the commercial power system by converting into AC power,
Connection determination means for determining whether or not the charging cable is connected to the vehicle;
Permission judging means for judging whether or not a signal indicating charging permission has been sent from the vehicle;
Equipped with a,
The control circuit, when it is determined that the charging cable is connected to the vehicle by the connection determining means, and then when the signal indicating the charging permission is transmitted from the vehicle by the permission determining means, By driving the bidirectional DC / AC converter with grid interconnection function and the bidirectional DC / AC converter, the electric power supplied from the commercial power system is supplied to the vehicle, and the charging cable is connected by the connection determination means. After it is determined that the vehicle is connected to the vehicle, the permission determination unit determines that a signal indicating the charging permission is not sent, and determines that an AC voltage is applied to the charging cable. By supplying a bidirectional DC / AC converter with an interconnection function and the bidirectional DC / AC converter, Charging apparatus characterized by that be supplied to the commercial power system the power. The charging device according to claim 1 ,
Provided between the bidirectional DC / AC converter with grid connection function and the bidirectional DC / AC converter, and output from the bidirectional DC / AC converter with grid connection function or the bidirectional DC / AC converter. A battery that is charged by direct current power
When supplying electric power to the vehicle, the control circuit drives the bidirectional DC / AC converter to convert DC power of the battery into AC power and supplies the AC power to the vehicle via the charging cable. When supplying power to the commercial power system, driving the bidirectional DC / AC converter with grid connection function converts the DC power of the battery into AC power and supplies the AC power to the commercial power system. A charging device. The charging device according to claim 1 or 2 ,
When the control circuit determines that at least one of the input / output voltage of the bidirectional DC / AC converter and the current flowing through the charging cable is not a desired value when supplying power to the vehicle, the system A bidirectional DC / AC converter with an interconnection function, and driving of the bidirectional DC / AC converter are stopped. The charging device according to any one of claims 1 to 3 ,
When the control circuit supplies power to the commercial power grid, at least one of the input / output voltage of the bidirectional DC / AC converter with grid interconnection function and the current flowing through the charging cable is a desired value. If it judges that it is not, the drive of the said bidirectional | two-way DC / AC converter with a grid connection function and the said bidirectional | two-way DC / AC converter will be stopped.