JPS6258228B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric vehicle charging device, and in particular, a plurality of chargers are connected in parallel in a predetermined pattern to charge any one of the storage batteries mounted on a plurality of electric vehicles. The present invention relates to an electric vehicle charging device that increases or decreases the number of chargers connected in parallel depending on the charging state of the electric vehicle.

In general, electric vehicles have the disadvantage that although charging time is long, their mileage is short. Although it is possible to use a quick charger to speed up the charging time, such a quick charger is expensive. For this reason, slow chargers that require charging time of about 7 to 10 hours are often used as chargers.

By the way, one charger is usually prepared for one electric vehicle. Therefore, for example, in a place where there are three electric vehicles, three chargers are prepared. Such a charger is placed in a garage and charges the storage battery while the electric vehicle is in the garage. Therefore, while the electric vehicle is running, each charger is idle. If these chargers are effectively used to enable rapid charging, it will be possible to charge efficiently without using an expensive rapid charger.

Moreover, if multiple chargers are used according to a predetermined pattern depending on which charging terminal the electric vehicle to be charged is connected to, the charger can be used effectively without having to idle the charger unnecessarily. It would be possible to use and efficiently charge the storage battery.

Therefore, a main object of the present invention is to provide an electric vehicle charging device that can effectively use a plurality of chargers and can efficiently charge a plurality of storage batteries.

To summarize this invention, based on which charging connection means the electric vehicle (storage battery) is connected to,
The output terminals of multiple chargers are connected in parallel in a predetermined pattern to rapidly charge the corresponding storage batteries, and the number of chargers connected in parallel is increased or decreased depending on the state of charge of the storage batteries. .

The above objects and other objects and features of the present invention will become more apparent from the detailed description given below with reference to the drawings.

FIG. 1 is a schematic block diagram of one embodiment of the present invention. In the configuration, the CPU 1 constitutes a switching control means. In relation to this CPU1, the sixth
A read-only memory (ROM) 2 that stores in advance a program based on the flowcharts shown in FIGS. 1 through 10, and a random access memory (RAM) 3 that stores data shown in FIG. 2, which will be described later, are provided. An interface 7 is connected to the CPU 1 via I/O4. A display 5 and a quick charge instruction switch 6 are connected to this interface 7. This quick charge instruction switch 6 is for giving an instruction to preferentially rapidly charge any one of A storage batteries 161 to C storage batteries 181, which will be described later. A changeover switch 12 is connected to the interface 7, and a
Various information signals from the electric vehicles 16-18 are provided via connectors 19-21.

The changeover switch 12 is supplied with charging outputs from, for example, three chargers 9 to 11. The A charger 9 to the C charger 11 each output a pulsating current voltage having a different phase based on the phases U, V, and W of the three-phase AC power supply 8, for example. Normally, a storage battery is charged with a pulsating voltage, and charging is performed only during a period when the pulsating voltage exceeds the storage battery voltage. Therefore, when charging is performed by superimposing pulsating currents having different phases, the period during which the pulsating current voltage exceeds the storage battery voltage increases, and the charging period can be shortened. For this reason, also in this embodiment, each of the chargers 9 to 11 outputs a pulsating voltage. The changeover switch 12 switches the output terminals of the A chargers 9 to C chargers 11 to connect them in parallel, and connects any of the switched chargers 9 to 11 to the electric vehicle via the plugs 13 to 15. 16, 17, or 18. In addition, this changeover switch 12
This will be explained in detail with reference to FIG. 3, which will be described later.

The A electric vehicle 16 is equipped with an A storage battery 161. The electric vehicle 16 also includes a plug insertion detector (P) 162 that detects that the plug 13 is inserted, a liquid level detector 163 that detects the liquid level of the storage battery 161, and a liquid level detector (P) 162 that detects the insertion of the plug 13.
a temperature detector 164 that detects the overtemperature of the storage battery 161; and a voltage detector 16 that detects the terminal voltage of the storage battery 161.
5 is provided. These detectors 162-16
The detection signal detected at 5 is given to the CPU 1 via the connector 19, interface 7, and I/O4. Similarly, the B electric vehicle 17 is equipped with a B storage battery 171 and is also provided with a plug insertion detector 172, a liquid level detector 173, a temperature detector 174, and a voltage detector 175. The detection signals detected by each of the detectors 172 to 175 are then given to the interface 7 via the connector 20. The C electric vehicle 18 is also equipped with a C storage battery 181, and is also equipped with a plug insertion detector 182, a liquid level detector 183, and a temperature detector 1.
84 and a voltage detector 185 are provided. The detection signals from each of the detectors 182 to 185 are then given to the interface 7 via the connector 21.

FIG. 2 is an illustrative diagram showing data stored in the RAM 3 shown in FIG. 1. In the figure, RAM3
includes storage areas 31-39. The storage area 31 has electric vehicles 16, 17, 18 plugs 13, 14,
The plug insertion detector 16 detects that the plug 15 has been inserted.
When signals No. 2, 172, and 182 are detected, flags Pa, Pb, and Pc are stored, respectively. The storage area 32 contains a flag for identifying the electric vehicle for which quick charging has been instructed by the quick charging instruction switch 6.
Memorize Qa, Qb, and Qc, respectively. Storage area 33
The liquid level is detected by the liquid level detectors 163, 173, and 183, and when the liquid level is below a predetermined level, flags La, Lb, and Lc are stored, respectively. The storage area 34 stores flags Ta, Tb, and Tb, which indicate when the temperature is detected by the temperature detectors 164, 174, and 184 and exceed a predetermined temperature.
Memorize each Tc. The storage area 35 stores the voltage level Va of the A storage battery 161 detected by the voltage detector 165 of the A electric vehicle 16 as 3-bit data. At the same time, the storage area 36 stores the voltage Vb of the B storage battery 171 of the B electric vehicle 17, and the storage area 37 stores the voltage Vc of the C storage battery 181 of the C electric vehicle 18. Storage area 38 is A
Storage battery 161, B storage battery 171, C storage battery 181
A flag X is stored for specifying which of the following should be prioritized for rapid charging. The storage area 39 stores a flag Y indicating the storage battery with the next highest priority. That is, the storage areas 38 and 39 store A as X if the A electric vehicle 16 has the highest priority, and store B as X if the B electric vehicle 17 has the next highest priority. Store as Y.

FIG. 3 is a specific circuit diagram of the changeover switch 12 shown in FIG. 1. This changeover switch 12 includes contacts 121-126. Contact 121 is A charger 9
and B are closed when the respective output terminals of charger 10 are connected in parallel. Contact 122 is closed when the output ends of B charger 10 and C charger 11 are connected in parallel. Further, the contact 123 is closed when the respective output terminals of the A charger 9 and the C charger 11 are connected in parallel. The contact 124 is closed when charging the A storage battery 161 of the A electric vehicle 16, the contact 125 is closed when charging the B storage battery 171, and the contact 126 is closed when charging the C storage battery 181. These contacts 121
to 126 are switched based on command signals given from the CPU 1 via the I/O 4 and the interface 7. Thereby, for example, contacts 121 and 1
When 22 and 124 are closed, A charger 9, B
The output terminals of the charger 10 and the C charger 11 are connected in parallel, and pulsating current voltages having different phases are applied to the A storage battery 161.

FIG. 4 is an external view showing the panel surface of one embodiment of the present invention. The display 5 indicates each storage battery 161, 17.
1,181, respectively, includes indicator lamps that respectively indicate charging, rapid charging, completion, insufficient liquid, and overtemperature. In addition, the quick charging instruction switch 6 has contacts OFF for not instructing quick charging, and contacts A, B, and C for giving an instruction to quickly charge the A storage battery 161, B storage battery 171, and C storage battery 181.
and, respectively.

FIG. 5 is an illustrative diagram for explaining a charging sequence according to an embodiment of the present invention. Next, this fifth
The charging sequence will be briefly explained with reference to the figure. In the present invention, the connection patterns of the chargers 9 to 11 connected in parallel by the changeover switch 12 are predetermined to differ depending on the number of vehicles to be simultaneously charged. Further, this pattern is made to differ depending on the switching of the quick charge instruction switch 6. That is, if the number of vehicles to be charged is one, switching of the quick charge instruction switch 6 is ignored and three chargers 9 to 11 are connected in parallel in the initial state to rapidly charge one storage battery. When the voltage of the storage battery reaches a predetermined voltage, the number of chargers connected in parallel is reduced to two, and when the voltage reaches a predetermined voltage or higher, only one charger is used.
Note that the charging time for only one last charger is determined by a timer built into the charger.

In addition, when charging the storage batteries of two vehicles at the same time and the quick charging instruction switch 6 is switched to the OFF position, the two chargers can be connected in parallel to quickly charge one storage battery. Then, use the remaining charger to gently charge the other storage battery. Then, when the voltage of one storage battery exceeds a predetermined value, the two chargers are combined into one, and the two chargers connected to the other storage battery are connected in parallel. Furthermore, when the voltage of the other storage battery exceeds a predetermined value, the number of chargers is reduced to one. If two vehicles are to be charged, and one of the vehicles is given a quick charge instruction, three chargers 9 to 11 are connected in parallel to one storage battery for quick charging. Then, when the voltage of the storage battery exceeds a predetermined voltage, the number of chargers is reduced to two, and the other storage battery is slowly charged using the remaining one charger. Further, when the voltage of one storage battery exceeds a predetermined value, the number of chargers is reduced to one, and the number of chargers for the other storage battery is increased to two.

When charging the storage batteries of three vehicles at the same time, if a quick charging instruction is not given, each charger 9 to 11 is individually connected to each charger to perform slow charging. If a quick charging instruction is given to one storage battery, three chargers 9 to 11 are connected in parallel to that storage battery for quick charging. When the voltage of the storage battery exceeds a predetermined value, the number of chargers is reduced to two, and the remaining one charger charges the storage battery selected as having the next highest priority. Further, when the voltage of the storage battery to which the rapid instruction is given exceeds a predetermined value, the number of chargers is reduced to one, and the remaining one storage battery is charged with that charger.

FIGS. 6 to 11 are flowcharts for explaining the specific operation of one embodiment of the present invention.
Next, the specific operation of one embodiment of the present invention will be described with reference to FIGS. 1 to 11. First, referring to FIG. 6, plugs 13, 14, 15
When any of the above is inserted into any of the electric vehicles 16, 17, 18, the plug insertion detectors 162, 172, 182 included in the respective electric vehicles
detects it. This detection signal is
9, 20, or 21 to the interface 7. Furthermore, the detection signal is given to the CPU 1 from the interface 7 via the I/O4. Also, liquid level detectors 163, 17 included in each electric vehicle 16, 17, 18, respectively.
3,183 detects the liquid level of each storage battery 161, 171, 181, and temperature detectors 164, 17
4 and 184 detect their respective temperatures, and voltage detectors 165, 175, and 185 respectively detect their voltages. The signals detected by these detectors are
Given to CPU1.

In step 1, the CPU 1 connects the plug 13,
14 or 15 is input, and when either of the insertion signals is input, the flag and data are set based on each detection data in step 2.
Store in RAM3. That is, based on the insertion signal, a flag Pa or a flag indicating which of the electric vehicles 16, 17, and 18 the plug is inserted is set.
Store PC in the storage area 31. Further, the storage area 32 stores flags Qa to Qc representing the electric vehicle designated by the quick charge instruction switch 6. Further, the liquid level flags La, Lb, and Lc of the batteries 161, 171, and 181 are stored in the storage area 33, the temperature flags Ta, Tb, and Tc are stored in the storage area 34, and the voltage data is stored in the storage area 33.
Store from 5 to 37. Furthermore, plugs 13-1
The priority order is determined based on the number of vehicles connected to the charger 5, the vehicle number for which quick charging is instructed by the quick charge instruction switch 6, and the pattern of the number of chargers operating in parallel as shown in FIG. That is, vehicle numbers with higher priorities are sequentially stored in storage areas 38 and 39.

After CPU1 stores each data in RAM3,
Proceed to step 3. Then, based on the flags Pa to Pc stored in the storage area 31, it is determined whether the number of charged vehicles is one. That is,
If any one of the flags Pa to Pc is set in the storage area 31, N1 and QN1 shown in FIG.
Proceed to subroutine. If two flags are set in the storage area 31, it is determined in step 4 that the number of charged vehicles is two, and the process proceeds to step 5. In step 5, it is determined whether or not flags Qa to Qc are set in the storage area 32 in correspondence to the flags Pa to Pc stored in the storage area 31, respectively. That is, in step 5, it is determined whether a quick charge instruction is given by the quick charge instruction switch 6 or not. If a quick charge instruction has not been given, the process proceeds to subroutine N2 shown in FIG. 8, and if a quick charge instruction has been given, the process proceeds to subroutine QN2 shown in FIG.
If it is determined in step 4 that the number of charging vehicles is 3, then in step 6 the number of charging vehicles is 3.
It is determined whether a quick charging instruction has been given to any of the vehicles. If there is no quick charge instruction, proceed to subroutine N3 shown in Figure 10,
If a quick charging instruction is given, it is shown in Figure 11.
Proceed to the QN3 subroutine.

Next, specific operations in each subroutine will be explained. First, a case will be described in which only the plug 13 is connected to the electric vehicle 16 and the number of charging vehicles is one. In this case, flags Pa, La, Ta, and Va are stored in each storage area of the RAM 3, respectively. Note that when there is only one vehicle to be charged, quick charging is forcibly achieved regardless of the instruction from the quick charging instruction switch 6.

In the subroutine shown in FIG. 7, x represents the symbol of the electric vehicle to be charged. Therefore, when charging the electric vehicle 16, x becomes A. First, in step 7, the CPU 1 determines whether the charging vehicle is A electric vehicle 1 based on the flag Pa.
6, and it is determined whether the liquid level of the A storage battery 161 is normal based on the flag Qa. If not normal, proceed to step 12; if normal, proceed to step 8. In step 8, it is determined whether the temperature of the A storage battery 161 is normal based on the flag Ta. If it is not normal, the process proceeds to step 12, and if it is normal, a command is given to the changeover switch 12 for rapid charging using the chargers 9 to 11. Based on this command signal, selector switch 1
Two contacts 121, 122 and 124 are closed. That is, the output terminals of the three chargers 9 to 11 are connected in parallel, and pulsating current voltages with different phases are applied to the A storage battery 161. Note that each of the chargers 9 to 11 has a built-in timer, and outputs voltage only for a predetermined time set by the timer.

In step 10, it is determined whether the voltage level of the A storage battery 161 has exceeded V3. This voltage V3 connects three chargers 9 to 11 in parallel to two
This is a predetermined voltage for switching to the base, and data representing this voltage is set in a storage area (not shown) of the RAM 3. A storage battery 161
If the voltage Va is less than V3, the process proceeds to step 11. In step 11, it is determined whether a flag other than the flag Pa stored in the storage area 31 has been set. That is, in this step 11, it is determined whether or not the insertion of the plug has been changed.
If it has not been changed, return to step 8 again.

Although the temperature of a storage battery generally increases sharply during charging, the liquid level changes relatively little, so whether or not the liquid level is normal is determined only at the initial stage. Therefore, during charging, it is determined whether the temperature and voltage are normal.

The above operation is repeated, and when the voltage Va becomes equal to or higher than V3 in step 10, the process proceeds to step 12. In step 12, it is determined again whether the liquid level is normal or not, and if it is not normal, the process proceeds to step 17. If the temperature is normal, the process proceeds to step 13, where it is determined whether the temperature is normal. If not normal, proceed to step 1; if normal, proceed to step 14. In step 14, the CPU 1 gives a command signal to the changeover switch 12 to connect two chargers in parallel. That is, since the voltage Va of the A storage battery 161 becomes equal to or higher than V3, the number of chargers is reduced to two. Based on a command signal from the CPU 1, the changeover switch 12 opens the contact 122, for example. Accordingly, from now on, A charger 9
and the output end of the B charger 10 are connected in parallel to charge the A storage battery 161. Then, in step 15, it is determined whether the voltage Va exceeds the voltage V2. This voltage V2 is a predetermined voltage for switching from two chargers to one, and is set in the RAM 3 in the same manner as the above-mentioned V3. If the voltage Va does not exceed V2, the process proceeds to step 16, where it is determined whether the plug has been changed. Thereafter, steps 13 to 16 are repeated, and when the voltage Va exceeds V2, the process proceeds to step 17. In step 17, a command signal is given from the CPU 1 to the changeover switch 12. Based on this switching signal, the changeover switch 12 opens its contact 121. Since contact 121 is opened, A
A storage battery 161 is charged only by charger 9. Then, charging is performed for the time set by the timer in the A charger 9, and after that time, charging is stopped.

As mentioned above, the plug 13 is connected to the A electric vehicle 16.
is inserted, the initial state is 3.
The chargers 9 to 11 are connected in parallel, and the number of chargers connected in parallel can be changed from 3 to 2 and then from 2 to 1 depending on the charging voltage. Since the number of vehicles to be charged is one, the instruction from the quick charging instruction switch 6 is completely ignored and quick charging is achieved.

Next, referring to FIG. 8, two electric vehicles 1
The operation when charging storage batteries 6 and 17 at the same time with two chargers 9 and 10 will be described. In this case, plugs 13 and 14 are connected to electric vehicles 16 and 17, respectively, and flags Pa, Pb, La, Lb, Ta, Tb, Va, and Vb are stored in RAM 3, respectively. Furthermore, it is assumed that the B electric vehicle 17 is given a high priority and the electric vehicle 16 is given a low priority. For this purpose, B is stored in the storage area 38 and A is stored in the storage area 39. In step 18
The CPU 1 gives a command signal to the changeover switch 12 in order to charge the A storage battery 161 with the A charger 9. Accordingly, the changeover switch 12 switches its contacts 124
Close only. Thereby, the A charger 9 is connected to the A storage battery 161 and charges it. In step 19, the CPU 1 determines whether or not the liquid level of the B storage battery 171 is normal based on the flag Lb. If not normal, proceed to step 24; if normal, proceed to step 20. In step 20, the B storage battery 17 is selected based on the flag Tb.
It is determined whether or not the temperature of No. 1 is normal. If not normal, proceed to step 24; if normal, proceed to step 21. In step 21, CPU1 is B.
A command signal for charging the B storage battery 171 by the charger 10 and the B charger 11 is given to the changeover switch 12. In response, transfer switch 12 closes its contacts 122 and 125. By this,
B charger 10 and C charger 11 are connected in parallel and connected to B storage battery 171. Below, B storage battery 1
71 is charged based on the output voltages of the B charger 10 and the C charger 11.

In step 22, the voltage of the B storage battery 171 is
It is determined whether Vb exceeds voltage V2. This voltage V2 is the same as the voltage V2 in step 15 of FIG. 7 described above. If the voltage Vb does not exceed the voltage V2, it is determined in step 23 whether the plug insertion has been changed. If it has not been changed, it is determined again in step 20 whether the temperature Tb is normal. Thereafter, steps 20 to 23 are repeated, and the B storage battery 171 is rapidly charged by the B charger 10 and the C charger 11.

When the voltage Vb exceeds the voltage V2 in step 22, a command signal for charging the B storage battery 171 only with the B charger 11 is given to the changeover switch 12 in step 24. In response, transfer switch 12 opens contacts 122. Thereby, only the B charger 10 is connected to the B storage battery 171, and thereafter, slow charging is achieved.

Thereafter, the CPU 1 proceeds to step 25, and this time determines whether or not the liquid level La of the A storage battery 161 is normal. Then, in step 26, the temperature is
It is determined whether Ta is normal, and in step 27, the contact 123 is closed and the A charger 9 and C charger 1 are connected.
1 in parallel to quickly charge the A storage battery 161. Hereinafter, the steps 19 to 2 described above will be explained.
3, step 26 to step 2
Repeat step 9. In other words, the B storage battery 171 is
Quickly charge the chargers 9 and 11 of the stand, and
When the voltage of B storage battery 1 exceeds a predetermined voltage,
Reduce the number of chargers connected to 71, and now connect to A
The number of chargers connected to the storage battery 161 is increased. Then, the voltage Va of the A storage battery 161 is the voltage V
If the number is 2 or more, in step 30, the number of chargers connected to the A storage battery 161 is reduced.

Next, when charging two storage batteries,
It is assumed that a quick charging instruction is given to one side. For example, when a quick charge instruction is given to the A storage battery 161 by the quick charge instruction switch 6, the flag Qa is stored in the storage area 32.
The subroutine shown in FIG. 9 then proceeds, and in steps 31 to 35, three chargers 9 to 11 are connected in parallel to quickly charge the A storage battery 161. This operation is the same as steps 7 to 11 in FIG. 7 described above. and,
When the voltage Va exceeds V3 in step 34, the number of chargers connected to the A storage battery 161 is reduced to two, and the B storage battery 171 is charged with the separated charger. In this case, for example, if contacts 121 and 122 are opened and contacts 123 and 124 are closed, A storage battery 161 can be quickly charged by A charger 9 and C charger 11, and if contact 125 is closed, B charger 10 can be charged quickly. This allows the B storage battery 171 to be slowly charged.

By repeating steps 37 to 41, the A storage battery 161 can be rapidly charged by the A charger 9 and the C charger 11, and the B storage battery 171 can be slowly charged by the B charger 10.
This operation is the same as steps 12 to 16 described above. Then, when the voltage of the A storage battery 161 exceeds V2, the parallel connection between the A charger 9 and the C charger 11 is disconnected, and this time, only the A charger 9 is connected to the A storage battery 1.
Charge 61. Then, steps 43 to 4
7, the B charger 10 and the C charger 11 are connected in parallel to quickly charge the B storage battery 171 with the two chargers. When the voltage Vb of the B storage battery 171 becomes equal to or higher than a predetermined voltage, the C charger 11 is disconnected and the B storage battery 171 is slowly charged only by the B charger 10.

As mentioned above, the A storage battery 161 and the B storage battery 17
1, if a quick charge instruction is given to the A storage battery 161, three chargers 9 to 11 are connected in parallel, and this charges the A storage battery 1.
61, then disconnect only the B charger and connect it to the B storage battery 171, and then disconnect the C charger 11 from the A storage battery 161,
The B storage battery 171 can be rapidly charged using the two chargers 10 and 11.

Next, with reference to FIG. 10, the operation when the number of charging vehicles is three and a quick charging instruction is not given to each vehicle will be described. In this case, in step 49, the contact 124 of the changeover switch 12 is closed and the A charger 9 is connected to the A storage battery 1.
61 and in step 50 contact 12
5 is closed to connect the B charger 10 to the B storage battery 171, and in step 51, the contact 126 is closed to connect the C charger 11 to the C storage battery 181. As a result, each of the storage batteries 161 to 181 is individually charged by each of the chargers 9 to 11.

If a quick charging instruction has been given to any of the three electric vehicles 16 to 18, the process proceeds to the subroutine shown in FIG. 11. That is, for example, if a quick charging instruction is given to the A electric vehicle 16, three chargers 9 to 11 are connected in parallel and connected to the A storage battery 161 in steps 52 to 56. Then, when the voltage Va of the A storage battery 161 exceeds the voltage V3, the B charger 10 is disconnected in step 57 and the B charger 10 is connected to the B storage battery 171. Then, in steps 58 to 2, the A storage battery 161 is quickly charged using the two chargers 9 and 11. If the voltage Va of the A storage battery 161 exceeds V2, step 6
3, disconnect the C charger 11, and proceed to step 6.
4, the C charger 11 is connected to the C storage battery 181. In other words, if the number of charging vehicles is 3 and A
If a quick charging instruction has been given to the storage battery 161, the number of chargers connected to the A storage battery 161 will be three in the initial state, and then the number of chargers connected in parallel will be reduced, and the remaining chargers will be used to charge the battery B sequentially. The storage battery 171 and the C storage battery 181 can be slowly charged.

In addition, in the operation shown in FIG. 11, the A storage battery 16
Reduce the number of chargers connected to 1 in the order of 3-2-1-0, and when the number of chargers connected to A storage battery 161 is 2, the number of chargers connected to B storage battery 171. When the number of chargers connected to the A storage battery 161 is one, the number of chargers connected to the C storage battery 181 is one. however,
Without being limited to this, if the number of chargers connected to A storage battery 161 is one, the number of chargers connected to B storage battery 171 is two, and in this case, C
A charger may not be connected to the storage battery 181. Then, when the voltage of the B storage battery 171 becomes equal to or higher than a predetermined voltage, the number of chargers connected to the B storage battery 171 may be one, and the number of chargers connected to the C storage battery 181 may be two.

FIG. 12 is a block diagram of another embodiment of the present invention, and FIG. 13 is a block diagram of the switch AS shown in FIG.
1 to AS15 and a positive bus bar; FIG.

In this embodiment, six chargers 41 to 41 are connected based on arbitrary two phases of each phase U, V, and W of a three-phase AC power supply.
46 for half-wave rectification so that six chargers can be used in any combination for charging. For this purpose, each charger 41 to 46 includes a transformer and a rectifying diode, and each output end is connected to a switch.
It is connected to A connector 51 to F connector 56 via MS1 to MS6. Furthermore, each charger 41 to 4
The output terminals of 6 can be connected in parallel in any number by switches AS1 to AS15. This switch
As shown in FIG. 13, AS1 to AS15 are inserted on all sides and diagonals of the hexagon, so the storage battery can be charged in any combination.

FIG. 14 is a diagram for explaining a charging sequence performed by the embodiment shown in FIG. 12. As is clear from FIG. 14, for example, when charging one storage battery using chargers 41, 45, and 46, connect A connector 51 to the storage battery and close switches MS1, AS5, and AS6. Bye. In addition, one storage battery is charged by chargers 41, 45, and 46, and chargers 42 and 43 are used to charge one storage battery.
and 44, connect connector 51 to one storage battery, connect connector 52 to charge the other storage battery, and switch MS.
1, AS5, and AS6, and close the switch.
All you have to do is close MS2, AS2, and AS3. below,
The combination shown in FIG. 14 allows any number of chargers to be connected in parallel for charging. In the example shown in FIG. 14, up to three chargers can be connected in parallel, but four or more chargers may also be connected in parallel. In addition, connectors 51, 52, 5
3 is connected to a storage battery, the switch is initially
AS6, AS5, AS11 and switch MS1, MS
2. With MS3 closed, three chargers 41, 45, and 46 can be connected to connector 51, chargers 42 and 44 can be connected to connector 52, and charger 43 can be connected to connector 53. In addition, the switch
It is not necessary to provide all of AS1 to AS15, and they may be provided as necessary.

As described above, according to the present invention, the output ends of a plurality of chargers are connected in parallel in a predetermined pattern based on which charging connection means the charging vehicle is connected to, and the corresponding storage battery is rapidly charged. Since the number of chargers connected in parallel is increased or decreased depending on the state of charge, the chargers can be used effectively without being left unnecessarily idle. Moreover, the storage battery can be charged quickly by using multiple regular chargers.
There is no need to use an expensive quick charger, the cost can be reduced, and the storage battery can be charged efficiently.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of one embodiment of the present invention. FIG. 2 is an illustrative diagram showing data stored in the RAM shown in FIG. 1. FIG. 3 is a specific circuit diagram of the changeover switch. FIG. 4 is an external view of one embodiment of the present invention. FIG. 5 is an illustrative diagram for explaining a charging sequence according to an embodiment of the present invention. Figure 6, Figure 7, Figure 8, Figure 9
10 and 11 are flowcharts for explaining specific operations of an embodiment of the present invention. FIG. 12 is an electrical circuit diagram of another embodiment of the invention. FIG. 13 is a diagram showing how the switch shown in FIG. 12 is connected to the + bus bar. FIG. 14 is a diagram for explaining the charging sequence of another embodiment of the present invention. In the figure, 1 is the CPU, 3 is the RAM, 6 is the quick charge instruction switch, 8 is the three-phase power supply, 9 to 11, 4
1-46 are chargers, 12, AS1-AS15, MS
1 to MS6 are changeover switches, 13 to 15 are plugs, 16 to 18 are electric vehicles, 161, 171,
181 is a storage battery, 162, 172, 182 are plug insertion detectors, and 165, 175, 185 are voltage detectors.

Claims (1)

[Scope of Claims] 1. A charging device for charging storage batteries installed in each of a plurality of electric vehicles, comprising: a plurality of chargers each outputting voltages with different phases; and an output terminal of each of the chargers. switching means for arbitrarily switching and connecting in parallel; a plurality of connection means for connecting the output end of each of the chargers to any of the plurality of storage batteries; a detection means for detecting that any one of the plurality of storage batteries is connected to the connection means; and the plurality of chargers are connected in parallel by the switching means in a predetermined pattern based on a detection signal of the detection means. A charging device for an electric vehicle, further comprising a switching control means for increasing or decreasing the number of chargers connected in parallel by the switching means according to the detected state of charge of the storage battery. 2. The electric vehicle charging device according to claim 1, wherein the charger outputs voltages with different phases depending on each phase of a three-phase AC power supply.