JPS5826535A - Charger for electric vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 one of the storage batteries installed in a number 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 state of charge of a storage battery.

In general, electric vehicles have the disadvantage that the charging time is long, but the driving distance 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 cars, three chargers are prepared. Such chargers are placed in garages and charge storage batteries at the gates where electric vehicles are parked. Therefore, in the area where electric vehicles are traveling, 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 chargers can be used effectively without being idle unnecessarily. It would be possible to efficiently charge the storage battery.

Therefore, the main object of the present invention is to provide an electric vehicle charging system that can effectively use multiple chargers and efficiently charge multiple storage batteries.
The purpose is to provide an I-position.

To summarize this invention, based on which charging connection means an electric vehicle (storage battery) is connected to, the output ends of a plurality of chargers are connected in parallel in a predetermined pattern to quickly charge the corresponding storage battery. The structure is such that the number of chargers connected in parallel can be increased or decreased depending on the state of charge of the storage battery.

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 an embodiment of the present invention.

In the configuration, the CPUI constitutes a switching control means. In connection with this CPU't, a program based on the flowcharts shown in FIGS. 6 to 10 described later is stored in advance, and a random memory (ROM) 2 and a random memory for storing data shown in FIG. 2 described later are stored in advance. Access memory (RAM) 3
and is provided. Further, an interface 7 is connected to the CPU 1 via l104. 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 battery 161 to C storage battery 181, which will be described later. A changeover switch 12 is connected to the interface 7, and various information signals from, for example, three electric vehicles 16 to 18 are applied via connectors 19 to 21.

The changeover switch 12← is for example three chargers 9 to 1.
A charging output is given from 1. The A charger 9' to the C charger 11 are, for example, connected to each phase U, V, W of the three-phase AC cylinder i [8].
Each outputs a current voltage with a different phase based on . Normally, storage batteries are charged at first-rate voltage, 111
1i! Charging is performed only for ms when the voltage exceeds the storage battery voltage. Therefore, when charging is performed by overlapping pulsating currents with different phases,
There are many vIi regions where the pulsating current voltage exceeds the storage battery voltage, and the opening time during charging can be shortened. For this reason, even in this embodiment, each of the chargers 9 to 11 outputs a pulsating voltage. The selector switch 12 is for A charging lI9 or C charging like this! Switch the output ends of 111 and connect them in parallel!
! At the same time, one of the switched chargers 9 to 11 is connected to the & leakage force N of the electric vehicle 16, 17, and 18 via the plugs 13 to 15. The changeover switch 12 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 detection 1 (P, >162) that detects that the plug 13 is inserted, a liquid level detector 163 that detects the 1111h161 (7) wiIli level, and a liquid level detector 163 that detects the level of the storage battery 161. A temperature detection ai 64 for detecting overtemperature and a voltage detector 165 for detecting the terminal voltage of the storage battery 161 are provided.The detection signals detected by these detectors 162 to 165 are sent to the connector 19.interface 7, l104. CPU via
1 is given. Similarly, for B electric vehicle 17,
A B storage battery 171 is installed, as well as a plug insertion detector 172, a liquid level detector 1173, and a temperature detector 174.
and voltage detector 175 are set.

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 battery 6-cell 181 and a plug insertion detector 18.
2, a liquid level detection a 183, a concentration detector 184, and a voltage detection 1185 are provided. And each detection 1118
The detection signals 2 to 185 are given to the inter 7 ace 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 is storage area 3.
1 to 39 included. Storage area 31 is electric car 16.17
．． 18 that plug 13.14°15 was inserted,
When the plug insertion detectors 162, 172, and 182 respectively detect the plug insertion, flags Pa, Pb, and Pc are stored, respectively. The storage area 32 stores seven lags Qa, Qb, and Qc for specifying the electric vehicle for which quick charging has been instructed by the quick charging instruction switch 6, respectively. The storage area 33 stores flags l-a and l that indicate when the liquid level is detected by the liquid level detection units 1163, 173, and 183 and the liquid level reaches a predetermined level.
-b and lc are stored respectively.

The storage area 34 stores flags Ta, Tb, and 7c indicating when the concentration is detected by the temperature detectors 164, 174, and 184 and the temperature is above a predetermined moisture level, respectively. 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-pit data. Similarly, the storage area 36 stores the voltage vb of the 8 storage batteries 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. The storage area 38 stores 7 lags X for specifying which of the A storage battery 161.8 storage battery i7i and the C storage battery 181 should be given top priority for rapid charging. The storage area 39 stores a flag Y indicating the storage battery with the next highest priority. That is, in the storage areas 38 and 39, for example, if the A electric vehicle 16 has the highest priority, it is stored as A'&X, and if the B electric vehicle 17 has the next highest priority, it is stored as B. is stored as Y.

FIG. 3 is a specific circuit diagram of the changeover switch 12 shown in FIG. 1. This changeover switch 12 has contacts 121 to 126
including. Contact 121 is closed when the respective output ends of A charger 9 and 8 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. In addition, the contact point 123 is A
It is closed when the respective output terminals of charger 9 and C charger 111 are connected in parallel. The contact 124 is closed when charging the A storage battery 161 of the A electric vehicle 16, and the contact 125 is closed when charging the A storage battery 161 of the A electric vehicle 16. +171 is closed when charging, and connection Ja126 is closed when charging C storage battery 181. These contacts 121-126 are
104. It is switched based on a command signal given via the interface 7. As a result, when contacts 121, 122, and 124 are closed, the output terminals of the A charger 9°8 charger io and the C charger 11 are connected in parallel, and the 1u11 voltage resulting from each phase is connected in parallel. It is given to the A storage battery 161.

FIG. 4 is an external view showing the panel surface of an embodiment of the present invention. The display 5 indicates charging, training, completion, and insufficient liquid for each storage battery 161.179-i and iai. , and indicator lamps respectively indicating over-temperature. In addition, the quick charging instruction switch 6 has a contact OFF for not instructing quick charging, and a switch for A storage battery 161.8 and a storage battery 17
It includes contacts A and 8.0 for giving an instruction to rapidly charge the 1.0 storage battery 181, respectively.

FIG. 5 is an illustrative diagram for explaining a charging sequence according to an embodiment of the present invention. Next, the charging sequence will be briefly explained with reference to FIG. In this invention, the changeover switch 12
The connection patterns of the chargers 9 to 11 connected in parallel are predetermined in advance. In addition, this pattern C also changes depending on the switching of the quick charge instruction switch 6. If the number of charging vehicles is one, ignore the switching of the quick charging instruction switch 6,
Charging in the initial state [Three batteries 19 to 11 are connected in parallel to rapidly charge one storage battery. Then, when the voltage of this storage battery reaches a predetermined voltage, the number of parallel connection of chargers 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 are connected in parallel and one storage battery is charged. Charge quickly, then use the remaining charger to slowly 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 you are charging two vehicles,
If a quick charging instruction is given to one of the storage batteries, three chargers 9 to 11 are connected in a row 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 level, 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, each charge 119 to 1
1 is individually connected to each charger to perform 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 that has 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, four specific works of an embodiment of the present invention will be described with reference to FIGS. 1 to 11. First, referring to FIG. 6, when either plug 13, 14.15 is inserted into electric vehicle 16, 17.18, plug insertion detector '16 included in each electric vehicle is detected.
2,172,182 detects it. This detection signal is given to the interface 7 via either connector 19, 20 or 21. Furthermore, the detection signal is given to the CPU 1 from the interface 7 via l104. In addition, liquid level detectors 163, 173, 183 included in each electric vehicle 16, 17, 18 detect the liquid level of each storage battery 161, 171, 181,
11 degree detectors 164, 174 degrees, and 184 detect respective concentrations, and voltage detectors 165, 175, and 185 detect respective voltages.

The signals detected by these detectors are CPUcpu
In step 1, i wears a hakama until an insertion signal indicating that one of the plugs 13, 14, and 15 has been inserted is input, and when any insertion signal is input, each detection is performed in step 2. Store flags and data in R13-AM3 based on data. That is, based on the insertion signal,
A flag pa or PC indicating which of the electric vehicles 16, 17, and 18 the plug is inserted is stored 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. Furthermore, batteries 161,171.18
7 lags of each liquid level of 1, l-a, Lb, 10
are stored in the storage area 33, and density flags Ta and Tb are stored.

To is stored in the storage area 34, and voltage data is stored in the storage areas 35-37. Furthermore, the priority order is determined based on the number of vehicles to which the plugs 13 to 15 are connected, the vehicle number for which quick charging is instructed by the quick charging instruction switch 6, and the pattern of the number of chargers operating in parallel as shown in FIG. stipulate.

In other words, storage areas 38 and 39 have high priority &ζ
Ningryo numbers are stored sequentially.

The CPU 1 stores each data in the RAM 3 and proceeds to step 3. Then, based on the flag pa-pc stored in the storage area 31, it is determined whether the number of both devices is one. If any one of ~pc is set, the process proceeds to the subroutine N1.QNl shown in FIG. 7. If two flags are set in the storage area 31, the number of charged vehicles is two in step 4. Then, the process proceeds to step 5. In step 5, it is determined whether 7 lags Qa-Qc are set in the storage area 32 corresponding to each of the flags Pa to pc stored in the storage area 31. That is, in step 5, it is determined whether or not a quick charge instruction has been given by the quick charge instruction switch 6. If a quick charge instruction has not been given, the process proceeds to subroutine N2 shown in FIG. is given, the process proceeds to the QN2 subroutine shown in FIG. Determine whether an instruction has been given.If there is no quick charge instruction, the first
Unlike the N3 subroutine shown in 0-1, if a quick charge instruction is given, the process proceeds to the QN3 subroutine shown in FIG.

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, each storage area of RAM3 has flags Pa,
La, Ta, and Va are stored respectively. In addition, when the charging rate - is 1, the quick charging instruction switch 6
Fast charging is forcibly achieved regardless of instructions.

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 that the charging vehicle is the A electric vehicle 16 based on the flag pa, and determines whether the liquid level of the A storage battery 161 is normal based on the flag Qa. If it is not normal, proceed to step 12 and it is correct!
If so, proceed to step 8. In step 8, it is determined whether the concentration 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 in charges 119 to 11. Based on this command signal, contacts 121, 122 and 724 of switching step 12 are closed.

That is, the output terminals of the three chargers 9 to 11 are connected in parallel, and a current voltage of each phase is applied to the A storage battery 161. The chargers 9 to 11 each have a built-in timer, and output voltage only when open at a predetermined time set by the timer.

In step 10, the voltage level of the A storage battery 161 is v
It is determined whether the number exceeds 3 or not. This voltage ■3 is charging -
There is a predetermined voltage gauge for changing the parallel connection of 9 to 11 from three to two, and data representing this voltage is set in a storage area (not shown) of the RA 43. A storage battery 161! If Va is less than V3, switch 1
Go to 1.

In step 11, is it stored in the storage area 31? ! Determine whether a flag other than the flag Lumi is set.

That is, in this step 11, it is determined whether or not the insertion of the plug 17 has been changed. If the change has not been made, return to step 8 again.In general, the temperature of a storage battery increases rapidly during charging, but the liquid level rarely changes, so determine whether the liquid level is normal or not. is performed only at the beginning. Therefore, during charging, it is determined whether the temperature and voltage are normal.

The above operation is repeated, and in step 10 the voltage ya
When becomes v3 or higher, the process proceeds to step 12. Step 1
In step 2, 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 it is normal, the process proceeds to step 13, where it is determined whether the density is normal or not. 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. In other words, since the voltage Va#V3 of the A power storage 11161 or higher has been reached, the charger is changed to two -
Ras. Based on a command signal from the CPU, the changeover switch 12 opens the contact 1218-2, for example. Thereby, the output terminals of the A charger 119 and the B charger 10 are connected in parallel, and the A storage battery 161 is charged. Then, in step 15, the voltage V
It is determined whether or not a exceeds the voltage v2. This voltage V
2 is a predetermined voltage for switching from two chargers to one, and is set in RAM3 in the same manner as v3 above. If the voltage Va does not exceed v2, proceed to step 16. It is determined whether or not the plug has been changed. Hereafter, steps 13 to 16 are repeated, and the voltage V
If aSV2 is exceeded, the process proceeds to step 17. Step 17
Then, a command signal is given from the CPU 1 to the changeover switch 12. Based on this switching signal, the changeover switch 12 closes its contact 121, and as the contact 121 is opened, the charge is increased to 11A! 19 alone charges the A storage battery 161. Then, charging is performed only for the timer set by the timer A1u19, and when the time - has elapsed, the charging is stopped.

As described above, one plug 1319 chargers 9 to 11 are connected in parallel to the A electric vehicle 16, and the number of chargers connected in parallel is switched from 3 to 2 and then from 2 to 1 according to the charging voltage. I can do it. Since the number of vehicles to be charged is one, the instruction by the quick charging instruction switch 6 is completely useless! fast charging is achieved.

Next, referring to FIG. 8, an explanation will be given of the operation when the storage batteries 161 and 171 of two electric vehicles 16-17 are simultaneously charged by two chargers 9-10. In this case, plugs 13 and 14 are connected to electric vehicles 16 and 17, respectively, and flags Pa, Pb, La, Lb, Dinga, Tb, and Va are stored in RAM3.

vb are stored respectively. Further, it is assumed that the priority order is set such that the NEC vehicle 17 is given a high priority and the electric vehicle 16 is given a low priority order. For this purpose, B is stored in storage area 38 and 8 is stored in storage area 39. In step 18, CPU1 uses A charger 9 to
In order to charge the storage battery *iai, a command signal is applied to the changeover switch 12. In response, the changeover switch 12 closes only its contact 124. As a result, the A charger 9 is connected to the A storage 1116
1** and charge it. In step 19, the CPU 1 determines whether B electricity is stored a! based on the flag Lb. 1171
Determine whether the liquid level is normal. If normal, proceed to step 24; if normal, proceed to step 20
In step 20, it is determined whether or not the temperature of the zero storage battery 171 is normal based on the flag TbG.

If not normal, proceed to step 24; if normal, proceed to step 21. In step 21, CPU1 is 8 charging 1
A command signal for charging the 8111 battery 171 by the 110 and C charger 11 is given to the changeover switch 12.

In response, transfer switch 12 closes its contacts 122 and 125. With this, the B charger 10 and the C charger 111
1 are connected in parallel and connected to B power storage 11171.

Below is B storage battery 171! B charging sio and C charging 1111
and is charged based on the output voltage.

In step 22, it is determined whether the voltage 2l-vb of the B power storage 11171 exceeds the voltage v2. This voltage v
2 is the same as the voltage v2 in step 15 of FIG. 7 described above. If the voltage vb does not exceed the voltage 2, it is determined in step 23 whether or not 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, the operations of steps 2.0 to 23 are repeated, and the B storage battery 171 is rapidly charged by 8 charges 110 and C charges [111].

When voltage vb exceeds voltage v2 in step 22,
In step 24, a command signal for charging the B storage battery 171 only with the 8 charger 11 is given to the changeover switch 12. In response, the changeover switch 12 opens the contact 122 (.As a result, only the B charging sio is connected to the 8 storage battery 171, and thereafter, slow charging is achieved.

If so, CPLll proceeds to step 25, and this time
It is determined whether the liquid level la of the storage battery 161 is normal. Then, in step 26, it is determined whether the temperature Ta is normal or not, and in step 27, the contact 123 is closed and the A charger 19 and the C charger 111 are connected.
The A storage battery 161 is quickly charged by connecting them in parallel. Thereafter, Steps 26 to 29 are performed in the same manner as Steps 19 to 23 described above (without being repeated. In other words, the B storage battery 171 is rapidly charged with the two chargers 9 and 11, and the voltage of the B storage battery 171 is set to a predetermined level. When the voltage Va of the A storage battery 161 exceeds the voltage V2, the number of chargers connected to the B storage battery 171 is reduced, and the number of chargers connected to the A storage battery 1161 is increased. Then, in step 3o, A storage 1F161
Reduce the number of chargers connected to the

Next, when charging two storage batteries, it is assumed that a quick charging instruction is given to one of them.

For example, if the quick charge instruction switch 6 causes the A storage battery 1 to
When a quick charging instruction is given to 61, flag Qa is stored in storage area 32. Then, in the subroutine-play shown in FIG. 9, steps 31 to 35,
A storage battery 16 is created by connecting three chargers 9 to 11 in parallel.
1 to quickly charge 23-. This operation is the same as steps 7 to 11 in FIG. 7 described above. 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 8 storage batteries 171 are charged with one disconnected charger. In this case, for example, contacts 121 and 122 are opened and contacts 123 and 122 are opened.
4, the A storage battery 161 can be rapidly charged by the A charging 119 and C charging 1111, and if the contact 125 is closed, the B charger 10 can slowly charge the 8 storage battery 171.

Then, by repeating the operations of steps 37 to 41, the A storage battery 161 can be rapidly charged by the A charging lI9 and the C charger 11, and the 8 storage battery 171 can be slowly charged by the B charger 10.

This operation is the same as steps 12 to 16 above. Then, when the voltage of A storage battery 16,1 exceeds v2, A
Parallel with charger 9 and C charger 11! The I connection is disconnected, and the A storage battery 161 is now charged only with the A charger 9. Then, in steps 43 to 4 and -24-7, 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 charger 10 alone is used.
The storage battery 171 is slowly charged.

As mentioned above, when charging the A storage battery 161 and the 17 B storage batteries, if a quick charging instruction is given to the A storage battery 161, three chargers 9 to 11 are connected in parallel and the A storage battery 161 is charged. Rapidly charge the storage battery 161, then disconnect only the charger and connect it to the 8 storage battery 171, and then charge C! ! 11 with A storage? ! Disconnect from 1161 and connect B storage battery 1 with two charged 5iio and 11.
71 can be charged quickly.

Next, with reference to FIG. 10, an explanation will be given of the operation when the number of charging vehicles is three and a quick charging instruction is not given to each vehicle. 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 125-61, and in step 50 the contact A 125 is closed and the B charger 10 is connected to the B storage battery 171. and in step 51 contact 126 is heard to connect C charger 1.
1 is connected to the C storage battery 181. This allows each charge! Each storage battery 161 to 18 by I9 to 11
1 are individually charged.

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, the three charging units W9 to 11 are connected in parallel and connected to the A storage battery 161 in steps 52 to 56. And A storage a! When the voltage Va of 1161 exceeds the voltage v3, the B charger 10 is turned off in step 57, and this 8 charger 10 is connected to the 8 storage battery 17.
Connect to 1. Then, step 58 to step 2
, A storage battery 11161 is rapidly charged using two chargers 9 and 11. Then, the voltage Va$V of the A storage battery 161
If it exceeds 2, the C charger 1t11 is disconnected at step 63 (26-), and the C charger 11 is connected to the C storage battery 181 at step 64.

In this case, the number of charging vehicles is 3, and the A storage battery is 161.
If a quick charging instruction is given to the A storage battery 161, the number of chargers connected to the A storage battery 161 will be set to 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 sequentially connect the B storage battery 171. The °0 storage battery 181 can be slowly charged.

In addition, in the operation shown in FIG. 11, the number of chargers connected to the A storage battery 161 is reduced in the order of 3-2-1-0, and the A
When the number of chargers connected to the storage battery 161 is two, the number of chargers connected to the B storage battery 171 is one, and when the number of chargers connected to the A storage battery 161 is one, the number of chargers connected to the A storage battery 161 is one.
! The number of chargers connected to 181 was set to one. However, without paying attention to this, if the number of chargers connected to the Aljl battery 161 is 1, 8 storage batteries 1
Assuming that the number of chargers connected to 71 is two, this will be a C storage battery! 181 may not be connected, and the voltage of the 8 storage battery 171 may be set to 1, and the number of chargers connected to the C storage battery 181 may be 2. .

FIG. 12 is a block diagram of another embodiment of the invention,
FIG. 13 shows the switches AS1 to AS1 shown in FIG.
FIG.

In this embodiment, six chargers 641 to 46 perform half-wave rectification based on any two phases of each phase U, V, and W of a three-phase AC power supply, and charge six chargers in an arbitrary combination. It is configured so that it can be done. For this purpose, each charger 41-4
6 includes a transformer and a rectifier diode, and the output terminals of each are connected to A connectors 51 to 51 through switches MS1 to MS6.
It is connected to the F connector 56. Furthermore, each charger 41~
The output terminals of 46 can be connected in parallel in any number by switches AS1 to AS15. This switch ASI~
As shown in FIG. 13, the AS15 is 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 in which charging is performed according to the embodiment shown in the twelfth factor.

As is clear from FIG. 14, for example, the charger 41
45 and 46, connect the A connector 51 to the storage battery and switch MS1.
．． AS5. AS6elU1'L is fine. Also, charger 4
Charge one storage battery with 1, 45, and 46, and charge! 42, 43, and 44, when charging one storage battery, connect the connector 51 to one storage battery,
Connector 52 charges the other storage battery, and switch MS1
, AS5 and AS6, and switch MS2
, and close AS2 and AS3. Hereinafter, by the combination shown in FIG. 14, it becomes possible to connect any number of chargers 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, the connector 51
．． 52.53 is connected to the storage battery, initially the switch 29-AS6. AS5. A811 and switches MSi, MS2.
Close the MS3 and connect the three chargers 41.4 to the connector 51.
5. Connect 4j6, charger 42 and 4 to connector 52.
4, and the charger 43 can be connected to the connector 53. Note that it is not necessary to provide all the switches ASI 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, since the storage battery can be charged quickly by using multiple regular chargers, there is no need to use expensive quick chargers, making it possible to reduce the cost and charge the storage battery efficiently. be able to.

[Brief explanation of the drawing]

30- FIG. 1 is a schematic block diagram of an embodiment of the present invention. FIG. 2 is an illustrative diagram showing data stored in the RAM shown in FIG. 1. FIG. 3 is also 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 the 1-ms charging sequence of the present invention. FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, and FIG. 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 a connection mode between the switch shown in FIG. 12 and ten busbars. FIG. 14 is a diagram for explaining the charging sequence of another embodiment of the present invention. In the figure, 1 is a CPU, 3 is a RAM, 6 is a quick charge command switch, 8 is a three-phase power supply, 9 to 11 degrees, 41 to 46 are chargers, 12. AS1 to AS15゜MS1 to MS6 are changeover switches, 13 to 15 are plugs, 16 to 18 are electric vehicles, 161, 171181 are storage batteries, 162, 172,
Showing 182 silk plastic dispenser. Patent applicant Daihatsu Motor Co., Ltd. Figure 2 Figure 5'! J7 figure δth

Claims (2)

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