JPH1066269A - Charger for electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable charging from a commercial alternating-current power supply in a charger for electric vehicles that charges a battery as power supply for driving an electric vehicle. SOLUTION: This charger for electric vehicles consists of converters 1-1-1-6 for charging and a switching control section 4. The converters 1-1-1-6 for charging are connected in correspondence with a plurality of blocks B1-B6 obtained by dividing a battery 5, formed by series-connecting a plurality of battery cells, and charge the blocks B1-B6. When a high voltage, such as 200V, is detected in an alternating-current power supply by a voltage detecting section 3, the switching control section 4 simultaneously operates the converters 1-1-1-6 for charging by control signals a-f to simultaneously charge the blocks B1-B6. When a low voltage, such as 100V, is detected, the switching control section 4 sequentially operates the converters 1-1-1-6 for charging at specified time intervals by the control signals a-f to correspondingly and sequentially charge the blocks B1-B6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle charger for charging a battery of a driving power supply.
Since a battery of a power supply for driving an electric vehicle has a relatively large capacity, it has been considered that a dedicated charging stand is distributed and charged to charge the battery. However, with the spread of electric vehicles, there is a demand for charging at ordinary households instead of moving to a charging station for charging.

[0002]

2. Description of the Related Art A traveling motor of an electric vehicle has a maximum number of one.
It has an output of about 00 kW, and the battery of the driving power source is 200 V to 350 V by connecting battery cells in series.
It has a relatively large capacity configuration with a voltage of about V. Therefore, the charging station is provided with a configuration for charging the battery using the motive power.

FIG. 3 is an explanatory view of a conventional example, showing a case of a charging stand, in which 11 is an electric vehicle, 12a and 12b are batteries of a driving power supply, 13 is a charging connector, and 14 is mounted separately. A cable for connecting the batteries 12a and 12b, 15 is an AC power source for a distribution station, a substation, or the like;
Is a three-phase power line, 17 is a transformer rectifier, 18 is a charger, 19
Is a rapid charging battery, 20 is a rapid charging section, 21 is a current control section, 22 is a charging control section, 23 is a charging connector,
Reference numeral 4 denotes a control circuit of the charging unit.

[0004] This conventional charging stand shows a case in which a quick charge battery 19 is used to rapidly charge batteries 12 a and 12 b of a drive power supply mounted on the electric vehicle 11, and an AC power supply is connected via a three-phase power line 16. 15 to 3 phase 6
A high voltage such as 000 V or a low voltage of three phases 200 V is supplied to the transformer rectifier 17. The transformer rectifier 17 transforms the voltage into an AC voltage corresponding to the charging voltage of the battery 19 for quick charging, rectifies the voltage, and supplies the voltage to the charger 18. Add. The charging unit 18 controls the control circuit 24 so as to always or quickly charge the battery 19 for quick charging and to prevent overcharging. Since the quick charging battery 19 is fixed to the charging stand, it is easy to adopt a large capacity configuration.

[0005] When the charging connector 23 on the charging stand side is inserted into the charging connector 13 of the electric vehicle 11 and the quick charging section 20 is operated, the charging characteristics of the batteries 12 a and 12 b and the discharging characteristics of the quick charging battery 19 are changed. Correspondingly, the charge control unit 22 controls the current control unit 21 and the quick charge battery 19
a and 12b are rapidly charged. Therefore, even if the charging unit 18 and the transformer rectifying unit 17 are not configured for high power, the battery 1
Rapid charging of 2a and 12b becomes possible.

The above-mentioned charging stand allows the batteries 12a and 12b of the electric vehicle 11 to be rapidly charged by the charging device. However, since the electric vehicle 11 is not equipped with a charging device, it can be charged even if an AC power supply is present. Can not do it. Therefore, there has been proposed a configuration in which a charging device is mounted on an electric vehicle and, if an AC power supply is present, the battery is charged by connecting the AC power supply to an outlet thereof.

[0007]

SUMMARY OF THE INVENTION
A V-type outlet can carry a maximum of 30A, and a 100V-type outlet can carry a maximum of 15A. However, when charging the battery of an electric vehicle, if the input power of the charging device is, for example, 4 kVA, the AC 20
Since the current is 20 A in the case of an AC power supply of 0 V, the battery can be charged by connecting to an outlet of AC 200 V.

However, when the AC voltage is 100 V, the current is 40
Because it becomes A, maximum 15A of AC 100V outlet
And the battery of the electric vehicle cannot be charged using the AC 100 V outlet. When the battery of the electric vehicle is charged by being plugged into the AC 100 V outlet, the rated current appears on the outlet side. There is a problem that the above-mentioned current flows to burn the wiring and blow the fuse. SUMMARY OF THE INVENTION It is an object of the present invention to stably charge a battery of an electric vehicle with respect to a voltage of a high or low AC power supply.

[0009]

An electric vehicle charging apparatus according to the present invention is an electric vehicle charging apparatus equipped with a battery 5 in which a plurality of battery cells are connected in series, wherein the battery 5 is connected to a plurality of blocks B1 to B6. And a charging converter 1 connected to the blocks B1 to B6 for charging.
-1 to 1-6 and the voltage detector 3 detects whether the AC power supply is high voltage or low voltage, and operates the charging converters 1-1 to 1-6 corresponding to the blocks at the same time when the AC power supply is at the high voltage. A switching control unit 4 for performing corresponding charging and performing block-specific charging by operating the block-compatible charging converters 1-1 to 1-6 sequentially at predetermined time intervals when the voltage is low.
And

The charging converters 1-1 to 1-6 corresponding to the blocks B1 to B6 of the battery 5 output a DC voltage set for an input voltage range of a high voltage and a low voltage of an AC power supply. It has.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an embodiment of the present invention, wherein 1-1 to 1-6 are charging converters, 2 is a charging control section, 3 is a voltage detecting section, and 4 is switching control. Reference numeral 5 denotes a battery of a power supply for driving the electric vehicle, 6 denotes a load of a driving motor or the like, 7 denotes a plug inserted into an outlet (not shown) of an AC power supply, and B1 to B6 denote blocks obtained by dividing the battery 5.

The battery 5 has a voltage of 200 V to 3 as described above.
The battery cells are connected in series so as to have a voltage of about 50 V.
1 to B6 and divided into charging converters 1-1 to 1-6.
Connect. In the case shown in the figure, the battery 5 is divided into six blocks B1 to B6 and the six charging converters 1-1.
1 to 6 are connected, the number can be divided into a number corresponding to the voltage of the battery 5 and the output DC voltage of the charging converter.

The charging converters 1-1 to 1-6 are configured to receive an AC voltage and start a charging operation in response to a control signal. Various known configurations can be applied. . When the input AC voltage is 100 V
Even if it changes over the range of 200 V, a configuration in which the switching width and the like are automatically controlled to maintain the set DC voltage can be applied.

The charging control section 2 includes a voltage detecting section 3 and a switching control section 4. The voltage detecting section 3 has an AC power supply 10 AC.
It detects and determines whether the voltage is a low voltage of 0 V or a high voltage of 200 V, and various known configurations can be applied. The switching control unit 4 simultaneously outputs the control signals a to f in the case of a high voltage detection signal from the voltage detection unit 3 and sequentially switches and outputs the control signals a to f in the case of a low voltage detection signal. It can be configured using an electronic circuit in which a switching element such as an FET and a timer are combined, a rotary switch, a relay, and the like.

Therefore, the switching control unit 4 receives the high-voltage detection signal of 200 V AC from the voltage detection unit 3 and
The control signals a to f are simultaneously output and the charging converter 1-
1 to 1-6, the charging converter 1-1
1 to 6, the blocks B1 to B6 of the battery 5 are simultaneously charged.

The switching control unit 4 sequentially switches and outputs the control signals a to f at predetermined time intervals when a low-voltage detection signal of 100 V AC is applied from the voltage detection unit 3. In the case of -1 to 1-6, the blocks B1 to B6 of the battery 5 are sequentially switched and charged at predetermined time intervals. That is, it is charged for each block. It should be noted that the detection signal from the voltage detector 3 may be added to the charging converters 1-1 to 1-6 so that the DC output voltage is maintained at the set value by automatic switching corresponding to the input voltage. It is possible.

FIGS. 2A to 2F are explanatory diagrams of control signals according to the embodiment of the present invention. FIGS. 2A to 2F show examples of control signals a to f from the switching control unit 4, and are shown at predetermined time intervals t. Output sequentially. That is, the control signals a to f output from the switching control unit 4 when the low voltage detection signal of AC 100 V is applied from the voltage detection unit 3 are shown.

Therefore, the charging converter 1-1 corresponding to the block B1 performs the charging operation during the predetermined time t when the control signal a shown in (a) is at a high level, and the charging converter 1-2 of the block B2 performs ( The control signal b shown in b) performs a charging operation at a predetermined time t of a high level, and similarly, the charging converters 1-1 to 1-6 are switched every predetermined time t until the charging of the battery 5 is completed. Charging is performed for each of the blocks B1 to B6. The predetermined time t takes into consideration the time required to complete the charging of each of the blocks B1 to B6 of the battery 5, and even when the battery is not fully charged, the blocks B1 to B6
6 can be selected so as to reduce the variation in the state of charge.

When a high voltage detection signal of 200 V AC is applied to the switching control unit 4 from the voltage detection unit 3, all the control signals a to f are set to the high level. Thereby, the charging converters 1-1 to 1-6 corresponding to the blocks B1 to B6 perform the charging operation at the same time.

For example, charging converters 1-1 to 1-6
Is 700 VA, the input power of the six charging converters 1-1 to 1-6 is 4200 VA. In the case of an AC 200 V input voltage, the input current is 21 V.
The battery A can be charged by plugging the plug 7 into a 200 V AC outlet and simultaneously operating the charging converters 1-1 to 1-6.

In the case of an input voltage of AC 100 V, the input current is 42 A. Therefore, it is not possible to insert the plug 7 into the AC 100 V outlet and operate the charging converters 1-1 to 1-6 simultaneously. As shown in FIG. 2, since the voltage detection unit 3 detects AC 100V and applies the detection signal to the switching control unit 4, the switching control unit 4 sequentially outputs the control signals a to f as shown in FIG. Since the charging converters 1-1 to 1-6 operate one by one, the input current at that time is 7A. Therefore, AC 10
Insert the plug 7 into a 0V outlet,
Can be charged.

Since the battery 5 is switched and charged at predetermined time intervals corresponding to the blocks B1 to B6, the blocks B1 to B6 are charged evenly before full charge. In traveling, only the traveling distance is shortened, and the effect on the life of the battery 5 can be ignored. However, in the case of the method in which the charging of the next block is started by the full charging of one block of the blocks B1 to B6, the variation in the charging state of each block B1 to B6 is large until the full charging of all the blocks is completed. When the electric vehicle is driven in such a state, the influence on the life of the battery 5 increases.

In the case of a low voltage of 100 V AC, switching is performed every time charging is performed for a predetermined time t corresponding to the blocks B1 to B6. Therefore, the time required for charging the battery 5 becomes longer. If you charge it at night when it is not
Since inexpensive nighttime power can be used, the battery 5 of the electric vehicle can be charged using an ordinary household outlet.

In the case where the commercial AC power supply voltage becomes 200 V or 400 V in the future, the specified current capacity is determined by setting the low voltage to 200 V and the high voltage to 400 V and using the charging device having twice the charging capacity described above. The battery of the electric vehicle can be charged without exceeding.

[0025]

As described above, according to the present invention, the battery 5 of the electric vehicle is divided into a plurality of blocks B1 to B6 and connected to each of the blocks B1 to B6 to be charged and charged. 1-6 and a high voltage such as 200V AC or a low voltage such as 100V AC by the voltage detection unit 3. When the voltage is high, the charging converters 1-1 to 1-6 are controlled by the control signals a to f. Are simultaneously operated to perform charging, and when the voltage is low, the control signals a to f are sequentially output at predetermined time intervals, and the charging converters 1-1 to 1-6 are sequentially operated at predetermined time intervals to block. And a switching control unit 4 for performing corresponding charging.

Therefore, even with an outlet having a small current capacity such as AC 100 V, the current flowing through the outlet is reduced by sequentially operating a plurality of charging converters, so that it is possible to charge using an ordinary household outlet. Becomes Also, by charging the battery 5 corresponding to the blocks B1 to B6, it is possible to correct the variation in the characteristics of the battery 5 and charge each of them, and there is an advantage that the life of the battery 5 can be extended. In addition, even when the voltage of the outlet is unknown by the voltage detection unit 3,
Since the charging system is automatically switched, there is an advantage that the battery 5 can be safely charged without a specialist.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a control signal according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1-1 to 1-6 Charge converter 2 Charge control unit 3 Voltage detection unit 4 Switching control unit 5 Battery 6 Load 7 Plug B1 to B6 Block

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication location H02J 7/00 H02J 7/00 P 7/04 7/04 A // H02M 7/08 8726-5H H02M 7/08

Claims (2)

[Claims] 1. A charging device for an electric vehicle equipped with a battery in which a plurality of battery cells are connected in series, comprising: a charging converter for dividing the battery into a plurality of blocks and connecting and charging the blocks according to the blocks; The voltage detector detects whether the AC power supply is high voltage or low voltage, and when the voltage is high, all the charging converters corresponding to the block are simultaneously operated to perform the charging corresponding to the block, and when the voltage is low, the charging corresponding to the block is performed. And a switching control unit for sequentially operating the charging converters at predetermined time intervals to perform charging corresponding to the block. 2. The charging converter according to claim 1, wherein the charging converter is configured to output a DC voltage set for an input voltage range between a high voltage and a low voltage of the AC power supply. 2. The charging device for an electric vehicle according to 1.