JP3214044B2 - Charging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device for charging, for example, a storage battery mounted on an electric vehicle, and more particularly to a charging device for charging a plurality of types of electric vehicles.

[0002]

2. Description of the Related Art In an electric vehicle, a motor is used as a motor, a secondary battery (rechargeable battery) is mounted on a power source thereof, and motor control is performed by a motor control device. For this reason, an electric vehicle requires a charging device for charging a mounted storage battery, unlike supplying fuel such as gasoline required for a conventional vehicle using an internal combustion engine as a prime mover.

FIG. 5 shows a conventional charging device for an electric vehicle. 1 is a charging device, and 2 is an electric vehicle. A charging cable 3 is connected to output terminals A and B of the charging device 1, and the other end of the charging cable 3 is connected to input terminals A ′ and B ′ of the electric vehicle 2, so that the charging cable 3 is mounted on the electric vehicle 2. The storage battery 4 is charged.

[0004] In the charging device 1, the switch 6
AC power is taken in through the rectifier 7
To obtain DC power at the output terminals A and B via the switch 8. The control unit 9 which configures the charger in combination with the rectifier 7 controls the output current and the voltage of the rectifier 7 based on the DC current and the DC voltage detected by the current detection unit 10 and the voltage detection unit 11, and controls the constant current. The storage battery 4 is charged by a charging method such as a constant voltage method.

[0005] The charging device 1 is required to be able to charge the storage battery 4 in a short time in view of the spread and maintenance of electric vehicles. Improvements and researches are underway.

[0006]

The conventional charging device can adjust the charging voltage and current to some extent according to the voltage and capacity of the storage battery mounted on the electric vehicle. However, as electric vehicles become widespread, their storage batteries have greatly different voltages and capacities depending on the type of vehicle, and the conventional charging device causes an excessive or insufficient voltage or insufficient charging current.

In order to solve this problem, it is conceivable to prepare a charging device having a large voltage variable range and a large current variable range. However, the charging device requires a large-current, large-voltage control element and the like, and its apparent capacity is large. Uneconomical equipment with poor equipment efficiency.

As another method, it is conceivable to prepare a plurality of types of charging devices according to the voltage class and the capacity type of the storage battery. However, each charging device has a low operating rate because the type of storage battery that can be charged is limited. Become a charging device and reduce equipment efficiency.

[0009] It is an object of the present invention to provide a charging device capable of charging various storage batteries having different voltages and capacities while improving facility efficiency.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides one rectifier for converting AC power from an AC power supply into DC power, and a secondary DC load using the rectifier as a common DC power supply. A plurality of insulated chargers for obtaining output-controlled DC power for charging the battery, an individual operation mode for supplying individually controlled charging currents from the chargers to the loads, and an output of each charger. Switching between a high-voltage operation mode in which a high-voltage charging current controlled to a load is connected in series and a high-current operation mode in which the output of each charger is connected in parallel to supply a high-current charging current controlled to a load. And a control device.

[0011]

According to the present invention having the above-described structure, the charger is insulated and has an output control function, so that a plurality of chargers can be used as individual chargers and connected in series or in parallel. By switching, it can be used as a charger for a load equipped with a high-voltage, large-capacity storage battery. Also, the DC power required for each DC / DC converter is supplied from one rectifier, eliminating the need for a rectifier for each charger.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention, in which the present invention is applied to a charging device for an electric vehicle. The charging device includes one rectifier (AC / DC converter) 21 and a plurality of insulated chargers (DC) that use the rectifier 21 as a common DC power source to obtain output-controlled DC power for charging a storage battery of an electric vehicle.・ DC converter) 22 ₁ , 22 ₂ , 22 ₃
When, and a common control unit 23 of the charger 22 _{1-22 3.}

The control device 23 controls the output of the charger designated to operate among the chargers 22 _{1 to} 22 ₃ , and controls each charger to individually supply a charging current to the electric vehicle; A high voltage operation mode in which the output of each charger is connected in series to supply a high voltage charging current to the electric vehicle, and a high current operation in which the output of each charger is connected in parallel to supply a high current charging current to the electric vehicle. A control unit for switching to the mode.

[0014] In illustrated, a switch 24 for the three outputs of the charger 22 ₁ and 22 ₂ of the charger 22 _{1-22 3} to the high-voltage operation mode to be connected in series, are connected in parallel those outputs Switch 25 for setting to high current operation mode
When provided a switch 26 for high current operation mode of parallel connection of the output of the charger 22 ₂ and 22 _3, the control device 23 to a configuration in which on-off controls the switches 24 to 26 depending on the operation mode command Is done. The combination of these chargers connected in parallel and in series can be arbitrarily set by adding switches.

In the present embodiment, performing the respective charge controlling an electric vehicle battery is a single output voltage of the charger 22 _{1-22 3} by individual operation mode charger if it meets the current capability. Further, the switch 24 is turned on as long as an electric vehicle battery is high voltage class, the charger 22 ₁ and 2
Charging control by the high-voltage operation mode obtained by adding 2 _second output voltage. If the storage battery of the electric vehicle has a large capacity, the switch 25 is turned on or the switch 26 is turned on, and the output currents of the chargers 22 ₁ and 22 ₂ are added or the charger ₂ is turned on.
Controls charging by 2 ₂ 22 ₃ high current operation mode in which the output current obtained by adding the.

Therefore, in addition to the function of individually charging the electric vehicle, the charging device also has a function of performing high-voltage charging or high-current charging, and has a plurality of types of electric batteries having storage batteries of different voltage classes and capacities. The vehicle can be charged, and the output of the same type of charger can be connected in series or in parallel.

Further, since each charger uses one rectifier 21 as a common DC power supply, it is not necessary to prepare an individual AC / DC converter.

FIG. 2 shows a specific circuit diagram of the present invention.
A case is shown in which it is composed of _two chargers 22 ₁ and 22 ₂ . The chargers 22 ₁ and 22 ₂ include an inverter 31 for temporarily converting a DC input into AC power in order to form an insulation type, an insulation transformer 32 having the inverter output as a primary input, and a secondary output of the insulation transformer 32 as a DC. Is constituted by a converter 33 for converting the

The output voltages and currents of the chargers 22 ₁ and 22 ₂ are controlled by the output voltage of the inverter 31 and current control, for example, PWM.
It is controlled by the modulation rate in the inverter configuration. The charging voltage of the charger for this will be detected for each charger by the voltage detector 34 _1, 34 _2, the charging current is a current detector 35 _1, 35 ₂
Is detected for each charger.

The control unit 23 has a controller 36 as a control center, which is provided with a charger number to be operated among the chargers, a battery type of the electric vehicle, and a charge amount set value. It detects the amount of charge and generates a control output to the charger. The switches 25 and 24 are turned on to connect the chargers in parallel and in series.

The voltage detection switching circuit 37 includes a charger 22 ₁ ,
22 ₂ output voltages sequentially takes by the switching control of the controller 36, the current detection changeover circuit 38 charger 2
The output currents of 2 ₁ and ₂ 22 are sequentially taken in by switching control from the controller 36.

The charge amount calculating circuit 39 includes switching circuits 37 and 38.
The instantaneous charge amount of each charger is obtained by multiplying the voltage detection signal and current detection signal of each charger from, and this is integrated for each charger to obtain the charge amount for the storage battery of each electric vehicle and display the same. I do. In the high current operation mode in which the chargers are connected in parallel, the charge amount obtained by adding the charge amount of each charger is obtained. In the high voltage operation mode in which the chargers are connected in series, the charge amount obtained by adding the voltage of each charger is obtained. .

The charger control circuit 40 includes a set value switching circuit 4
Set values required for each charger from 1 (charger number, charge amount,
The voltage and the like are periodically switched and given, and individual control signals for the charger are generated using the current / voltage detection amounts from the switching circuits 37 and 38 corresponding to these set values as feedback signals. In addition, when the chargers are connected in parallel or in series, individual control signals are generated so that the output voltages and currents are shared by the chargers.

The gate circuit 42 power-amplifies the control signal for each charger from the charger control circuit 40, and
Is distributed to each of the chargers according to the switching control signal for each of the chargers.

According to the above-described configuration, the operation of the charger is controlled by providing the information for each charger to be operated to the controller 36, and the individual operation, the high voltage operation and the high current operation of the charger are performed depending on the operation mode. Is switched.

[0026]

As described above, according to the present invention, a plurality of insulated chargers having an output control function and one rectifier are provided as a common DC power supply for these chargers. An individual operation mode for individually controlled charging of loads such as storage batteries of an automobile, and a high voltage or high voltage for supplying a controlled high voltage or high current to an electric vehicle or the like by switching the output of each charger to series connection or parallel connection. By switching to the high current operation mode, it is possible to charge various electric vehicles equipped with storage batteries with multiple voltage classes and capacities by controlling the output of the charger, and to reduce the apparent capacity of the charger itself. Reduce the size and use the rectifier as a common DC power source to increase equipment efficiency.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a circuit diagram of an embodiment.

FIG. 3 is a configuration diagram of a conventional charging device.

[Explanation of symbols]

2: electric vehicle, 4: storage battery, 21: rectifier, 22 ₁ ,
22 ₂ , 22 ₃ ... charger, 23 ... control device, 24, 25,
26 switch, 31 inverter, 32 insulation transformer, 33 converter, 36 controller, 37 voltage detection switching circuit, 38 current detection switching circuit, 39 charge amount calculation circuit, 40 charger control circuit, 41 ... Set value switching circuit.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-58-26535 (JP, A) JP-A-59-145238 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02J 7/00-7/12 H02J 7/34-7/36 B60L 11/18

Claims (1)

(57) [Claims] 1. A rectifier for converting AC power from an AC power supply to DC power, and a plurality of rectifiers that use the rectifier as a common DC power supply to obtain output-controlled DC power for charging a secondary battery of a load. An insulated charger, an individual operation mode for supplying individually controlled charging current from each charger to each load, and a series connection of the output of each charger to supply a controlled high voltage charging current to the load. And a control device for switching to a high-current operation mode for supplying a controlled high-current charging current to a load by connecting the outputs of the chargers in parallel with each other.