KR101205906B1 - Charging system of electric vehicle using power of dc power system - Google Patents

Abstract

The present invention discloses an electric vehicle charging system capable of charging an electric vehicle using DC power system power. The disclosed electric vehicle charging system includes: a charging side DC transformer supplied with DC power from a distribution line of the DC power system; a second charging switch connected to an output terminal of the charging side DC transformer; and connected to the second charging switch. And a charging terminal configured to control charging of the electric vehicle by turning on / off the second charging switch to turn on / off power supply to the charging port. It can reduce the installation cost, reduce the overload of commercial power supply, and increase the charging efficiency of electric vehicles by allowing the charging of various electric vehicles with different power input values using a single charging port. Make sure

Description

Electric vehicle charging system using DC power system {CHARGING SYSTEM OF ELECTRIC VEHICLE USING POWER OF DC POWER SYSTEM}

The present invention relates to an electric vehicle charging system for charging an electric vehicle using DC power system power.

Due to the depletion of fossil fuels and pollutants generated from the use of fossil fuels, electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles driven by electricity are becoming popular.

These electric vehicles are driven by using the power charged in the built-in battery and require periodic battery charging.

In order to charge electric vehicles currently supplied at long distances, countries are installing charging stations for electric vehicles.

The charging station for an electric vehicle is configured to charge a battery embedded in the electric vehicle by converting into a DC power after receiving commercial power.

Therefore, when the installation of the electric charging station that can charge the battery of the electric vehicle, such as a general gas station increases the power demand has a problem that acts as a burden on the supply of commercial power.

In addition, the electric charging station of the prior art has a problem in that the installation cost is increased because a rectifier for changing the commercial power supply to the DC power supply when the commercial power is supplied to charge the battery of the electric vehicle.

In addition, the electric charging station of the prior art does not supply a DC power supply of various voltages suitable for a charging system of an electric vehicle having a variety of input voltage, there is a problem that the charging efficiency of the electric vehicle is reduced.

The present invention is to solve the above-mentioned problems of the prior art, a grounded DC power supply or AC power supply of a DC power system or a DC power system for supplying DC power for driving a railroad car such as light rail, monorail, subway, etc. It is an object of the present invention to provide an electric vehicle charging system using a DC power system power to reduce the overload when supplying commercial power by supplying an electric charging station installed in the electric charging station.

Another object of the present invention is to provide an electric vehicle charging system using DC power system power, which can reduce the installation cost of an electric charging station.

Another object of the present invention is to provide an electric vehicle charging system that enables charging of an electric vehicle using DC power system power having various charging voltage values.

An electric vehicle charging system of the present invention for achieving the above object comprises: a charging side DC transformer supplied with DC power from a distribution line of a DC power system; and a second charging switch connected to an output terminal of the charging side DC transformer; And a charging terminal connected to the second charging switch; and a charging terminal configured to control charging of the electric vehicle by turning on / off the second charging switch to turn on / off power supply to the charging port. It is characterized in that the configuration.

The second charging switch is configured to be connected to each of a plurality of power lines branched from an output terminal of the charging-side DC transformer to form a second charging switch part, and the charging port is configured to each power line to which the second charging switch is connected. Can be.

The charging terminal is configured to turn on / off a second switch connected to a charging port corresponding to the identifier among a plurality of second charging switches configured in the second charging switch unit when an identifier of the charging port is input. Can be.

The charging terminal may be configured for each charging port to which the second charging switch is connected to individually turn on / off the second charging switch.

The charging side DC transformer may be configured as a variable DC transformer.

The charging terminal may be configured to output a voltage conversion signal for converting and outputting a voltage to a user input voltage value by the charging-side DC transformer.

In addition, the electric vehicle charging system includes at least two or more input terminals connected to different distribution lines, respectively, and an output terminal connected to an input terminal of the charging-side DC transformer, so that electric power supply from one distribution line is performed. It may be configured to further include; automatic switching to supply power to the charging-side DC transformer by performing automatic switching to another distribution line when cut off.

The electric vehicle charging system may further include one or more DC circuit breakers connected between the distribution line and the DC converter of the charging side, and a protection circuit controller for selectively blocking the DC circuit breakers by receiving an external control signal. It can be configured to include.

In addition, the electric vehicle charging system is charged at the input terminal receives power from the DC power system of the electric vehicle charging system to receive the AC power supplied from the DC power system is converted to DC power and then supplied to the electric vehicle charging system. It may further comprise a side rectifier.

The electric vehicle charging system of another configuration of the present invention is branched from a DC power system and branched from a charging side rectifier that outputs DC power by receiving AC power from a plurality of power lines or DC power systems that supply DC power. A charging-side DC transformer unit configured of a plurality of charging-side DC transformers connected to each of a plurality of power lines for supplying and outputting the inputted DC power in accordance with a voltage conversion signal input from a charging terminal; A second charging switch unit connected to an output terminal of each of the transformers and configured to include a plurality of second charging switches turned on / off according to an on / off signal input from the charging terminal; and the second charging switch unit. A plurality of charging ports connected to each second charging switch; and the charging-side DC transformer unit and the second charging port. A voltage conversion signal which is connected to a position and outputs a voltage conversion signal for dropping and outputting a voltage to a user input voltage value to the charging-side DC transformer unit, and outputs an on / off signal of a second charging switch connected to the charging port connected to an electric vehicle; And a charging terminal which outputs to a second charging switch unit and controls the charging of the electric vehicle.

According to the present invention, the electric vehicle can be charged using a DC power system power supply, thereby reducing the occurrence of overload during commercial power supply.

In addition, the present invention can be used to charge the electric vehicle using a DC power system power supply, when installing an electric vehicle charging station does not have to be provided with a power transformer or rectifier, such as a transformer or a rectifier for converting AC power to DC power. It facilitates the installation of electric vehicle charging station and provides the effect of reducing the installation cost.

In addition, the present invention enables the charging of electric vehicles having various charging input voltage values using one charging port, thereby providing an effect of increasing the charging efficiency of the electric vehicle.

1 is a circuit diagram of an electric vehicle charging system according to a first embodiment of the present invention;
2 is a circuit diagram of an electric vehicle charging system according to a second embodiment of the present invention;
3 is a circuit diagram of an electric vehicle charging system according to a third embodiment of the present invention;
4 is a circuit diagram of an electric vehicle charging system according to a fourth embodiment of the present invention;
5 and 6 are diagrams showing that the automatic switch 111 and the protection cut-off controller 112 are installed in the electric vehicle charging system of FIGS. 1 and 3.

Hereinafter, with reference to the accompanying drawings showing embodiments of the present invention will be described in more detail the present invention.

Embodiments of the present invention will be described as an embodiment of the DC power system for the convenience of the subway power system.

1 is a circuit diagram of an electric vehicle charging system according to a first embodiment of the present invention.

As shown in FIG. 1, the electric vehicle charging system 100a of the first embodiment of the present invention is configured to be connected to the subway power system S. As shown in FIG.

The subway power system S includes a bus bar Lm provided with a first disconnector 10, a first breaker 20, a second disconnector 30, a third disconnector 40, a second breaker 50, A plurality of distribution lines Ld including a subway line transformer 60, a subway line rectifier 70, and a DC circuit breaker 90 connected in multiple stages are configured.

The subway power system S of the above configuration receives a high voltage AC power supply (eg, AC 22,900V) from a subway power supply substation or KEPCO, and thus the first and second disconnectors 10 and 30 are connected to the input and output sides. Power is supplied to the subway power system S via the bus line Lm having the first breakers 20 connected to each other.

In this case, the high-voltage AC power supplied through the first disconnector 10, the first breaker 20, and the second disconnector 30 is branched into a plurality of subway power devices through a plurality of distribution lines Ld, respectively. It is supplied to the subway line transformer 60 via each of the third disconnector 40 and the second breaker 50.

The subway line transformer 60 depressurizes the supplied high voltage AC power to an AC power supply (eg, AC 1200V) for supplying the subway line and outputs the same to the subway line rectifier 70.

The subway line rectifier 70 receives an AC power (about AC 1200V) supplied after being decompressed by the subway line transformer 60 and rectifies and outputs the DC power necessary for the inside of a DC power system such as about 750V or 1500V.

The DC power output from the subway line rectifier 70 may be supplied to the uplink line L1 and the downline line L2 of the electric vehicle via the DC circuit breaker 90 connected in multiple stages, so that the electric vehicle of the subway can operate. Make sure

The electric vehicle charging system 100a of the first embodiment of the present invention is a charging side DC circuit breaker 110 connected to the rear end of the subway line rectifier 70 in the above configuration, and is connected to the output terminal of the charging side DC circuit breaker 110. Branched from the side DC transformer 120 (DC-DC converter), the protection relay 130 connected to the output terminal of the charging side DC voltage generator 120, the first charging switch 140, and the first charging switch 140. A second charging switch unit 150 'having second charging switches 150 connected to a power line, a charging port 160 and a second charging switch unit 150' connected to each of the second charging switches 150; It is configured to include a charging terminal 170 for selectively performing the on / off control of each of the second charging switch 150 of.

The charging side DC circuit breaker 110 protects the electric vehicle charging system 100a by shutting off the power supply when an overcurrent occurs due to a short circuit, a ground fault, etc. generated in the electric vehicle charging system 100a, thereby preventing an electric accident. To prevent them.

The charging side transformer 120 receives a DC power supply (about 750V or 1500V) supplied through the charging side DC circuit breaker 110, and then decompresses and outputs the charging power of the electric vehicle (about 200 to 750V).

The protection relay 130 is connected to the output terminal of the charging-side DC transformer 120 is configured to remove the overcurrent or overvoltage generated by a short circuit or ground fault generated on the output side of the charging-side DC transformer 120. The protection relay 130 includes an overcurrent relay and a ground relay.

The first charging switch 140 is configured to manually cut off the power supplied to the second charging switch unit 150 'of the charging system 100a. This causes the installation of the charging port 160 or ground fault, or when the maintenance is required to artificially cut off the power.

The charging port 160 is configured in the form of a connector connected to the charging socket (not shown) of the electric vehicle.

The charging terminal 170 is a card reader unit (not shown) having a card reader 171, a currency recognition unit (not shown) having a currency inlet 172, a display unit for providing charging status information and a user interface ( 173), and a key input unit 174 for allowing a user to input control information, and a charging control unit (not shown) which is built to detect whether the electric vehicle is fully charged and terminate the charging. The charging control unit (not shown) is configured to detect the voltage or current flow of the second charging switch 150 to determine whether the battery charging of the electric vehicle is completed, and to display the completion of charging when the battery charging of the electric vehicle is completed. . In the above configuration, the card reader unit and the money recognition unit are examples of the payment unit of the present invention, and the key input unit 174 is an embodiment of the input unit of the present invention. The charging terminal 170 is connected to the electric vehicle (not shown) by the owner of the electric vehicle that needs to be charged to select the charging port 160, and then read the card through the card reader 171, or the money inlet ( 172) In the case of injecting money, payment for charging the electric vehicle is performed. After the payment is performed, the charging terminal 170 selects the charging port 160 connected to the electric vehicle through the key input unit 174, and the second charging switch of the second charging switch unit 150 ′ ( It is configured to supply power for charging to the electric vehicle by selecting and turning on the second charging switch 150 connected to the charging port 160 connected to the electric vehicle among the 150. The key input unit 174 may be configured to include various input means such as a touch pad, a keypad, a button type to which various functions for charging are assigned.

The charging terminal 170 enables the electric vehicle charging system 100a to receive a charging fee from the chargers and provide an electric charging service for the electric vehicle. In addition, since only the charging port 160 connected to the electric vehicle by the charging terminal 170 selectively supplies power for charging, the power supply is prevented from being supplied to other charging ports 160 not connected to the electric vehicle. To prevent safety accidents.

2 is a circuit diagram of an electric vehicle charging system according to a second embodiment of the present invention.

As shown in FIG. 2, the electric vehicle charging system 100b according to the second embodiment of the present invention has a subway line of the subway power system S due to the reason that the distance between the subway power system S and the electric vehicle charging station 100b is far. When it is difficult to receive power from the output of the rectifier 70, the AC power (about AC 1200V) that is not rectified from the subway line transformer 60 on the line of the input terminal side of the subway line rectifier 70 for charging the electric vehicle. It is configured to receive power.

Therefore, the electric vehicle charging system 100b of the second embodiment of the present invention further includes a charge measuring rectifier 180 for converting AC power supplied from the subway power system S into DC power. At the rear end of the charging side rectifier 180, as in the charging system 100a of the first embodiment of the present invention, the charging side breaker 110, the charging side transformer 120, the protection relay 130, and the first charging switch 140 ), The second charging switch unit 150 ′, a plurality of charging port 160 and the charging terminal 170 is configured.

3 is a circuit diagram of an electric vehicle charging system according to a third embodiment of the present invention.

As shown in FIG. 3, the electric vehicle charging system 100c according to the third embodiment of the present invention uses the electric bicycle system 100a and 100b and one charging port 160 of the first and second embodiments of the present invention. It is configured to charge an electric vehicle having a different input voltage, such as an electric motorcycle, an electric vehicle.

To this end, the electric vehicle charging system 100c of the third embodiment includes charging side DC transformers 120 and protection relays configured at a rear end of the charging side circuit breaker 110 of the electric vehicle charging system 100a of the first embodiment. 130 are installed for each power line connected to each charging port 160. In this case, the charging-side DC transformer 120 is composed of a variable voltage DC converter (DC-DC converter). The charging terminal 170 is configured to control the driving and voltage conversion values of the respective charging-side DC transformer 120.

In the electric vehicle charging system 100c according to the third embodiment of the above configuration, a user requesting charging of the electric vehicle connects the charging port 160 to the electric vehicle, and then performs payment through the charging terminal 170, and the electric vehicle After selecting the charging port 160 connected to the input voltage value for charging the electric vehicle. The charging terminal 170 selects and turns on the second charging switch 150 and the charging side DC transformer 120 connected to the charging port 160 connected to the electric vehicle, and outputs the output voltage value to the charging side DC transformer 120. Transmit the voltage conversion signal having a. The charging-side DC transformer 120 converts the DC power, such as about 750V or 1500V, into DC power corresponding to the voltage value input by the user (200-750V, etc.) and outputs the converted DC power through each output port. It is possible to perform charging for electric vehicles having different voltage values.

4 is a circuit diagram of an electric vehicle charging system according to a fourth embodiment of the present invention.

FIG. 4 shows the subway line rectifier of the subway power system S due to the reason that the electric vehicle charging system 100c of the third embodiment of the present invention is far from the subway power system S and the electric vehicle charging station 100b. When it is difficult to receive power from the output terminal of the 70, the AC power (about 1200 V AC) for charging the electric vehicle that is not rectified from the subway line transformer 60 in the line on the input terminal side of the subway line rectifier 70 It is configured to be supplied with.

Therefore, the electric vehicle charging system 100b of the fourth embodiment of the present invention further includes a charge measuring rectifier 180 for converting AC power supplied from the subway power system S into DC power. At the rear end of the charge measuring instrument 180, the charging side breaker 110, the charging side transformer unit 120 ', the plurality of protection relays 130, the first like the charging system 100a of the third embodiment of the present invention. The charging switch 140, the second charging switch unit 150 ′, the plurality of charging ports 160, and the charging terminal 170 are configured.

5 and 6 are views illustrating an automatic switch 111 and a protection cut-off controller 112 installed in the electric vehicle charging systems 100a and 100c of FIGS. 1 and 3.

The automatic switch 111 is a power supply for charging more than the power equipment (transformer, rectifier, DC high-speed circuit breaker, etc.) of one distribution line (Ld) for supplying power to the electric vehicle charging system (100a, 100c). When it is impossible to supply, it is automatically switched so that power can be supplied through another distribution line Ld connected to the automatic switch 111.

The protection circuit breaker 112 has an abnormality such as a failure of a power equipment of a distribution line Ld supplying electric power to an electric vehicle in a state where electric power is supplied to the electric vehicle charging systems 100a and 100c through the subway power system S. Electric power for charging the electric vehicle of the electric vehicle charging system (100a, 100c) when a condition occurs to supply power from the distribution line (Ld) for supplying power to the electric vehicle charging system (100a, 100b, 100c, 100d) The DC circuit breaker 110 receives a control command from SCADA (Supervisory Control and Data Acquisition) in the command room that centrally controls the subway track in case the electric vehicle is not supplied smoothly due to the supply. By blocking the electric vehicle charging power supplied to the electric vehicle charging system (100a, 100c) to temporarily block.

In the electric vehicle charging system 100a of the first embodiment of the present invention, as shown in FIG. 5, the automotive circuit breaker 111 is connected so that two input terminals are connected to two distribution lines Ld, respectively, and the output terminal is connected to a DC circuit breaker ( 110).

In the electric vehicle charging system 100c of the third embodiment of the present invention as shown in FIG. 6, the automotive circuit breaker 111 is connected such that two input terminals are connected to two distribution lines Ld, respectively, and the output terminals are connected to each DC. It is connected in parallel with the circuit breaker 110.

The protection circuit breaker 112 is connected to control the respective DC circuit breakers 110 independently in the electric vehicle charging systems 100a and 100c of the first and third embodiments as shown in FIGS. 5 and 6. The DC circuit breakers 110 are selected and temporarily blocked according to a control signal inputted from a remote monitoring and control device (SCADA).

In the embodiments of the present invention, the DC circuit breakers may be configured as a DC high speed circuit breaker (HSCB).

Although the embodiment of the present invention has been described as an embodiment of the DC power system for driving a railway vehicle, the present invention is not limited to the subway power system, and the DC power supply for driving high speed railway, light rail, monorail, etc. An electric vehicle charging system implemented using all of the supplied power systems is also within the scope of the present invention.

In addition, since the DC power supplied to the electric vehicle charging power system of the present invention may be supplied from another large DC power supply system such as a DC supply system of a plant, not a DC power system for driving a railway vehicle, a large DC power supply is provided. Receiving an electric charging system for charging an electric vehicle also belongs to the scope of the present invention.

100a, 100b, 100c, 100d: electric vehicle charging system
110: DC circuit breaker on charging side, 111: automatic switching machine, 112: protective circuit breaker
120: charge-side DC transformer, 130: protective relay
140: first charging switch, 150: second charging switch, 150 ': second charging switch section
160: charging port, 170: charging terminal, 180: charging side rectifier

Claims (10)

Charging-side DC transformer for supplying DC power from two or more branched distribution lines for driving an electric vehicle or a DC power system of the plant; And,
A second charging switch connected to an output terminal of the charging-side DC transformer;
A charging port connected to the second charging switch;
A charging terminal configured to control charging of the electric vehicle by turning on / off the second charging switch to turn on / off power supply to the charging port;
An automatic changer provided between the distribution line and the charging side DC transformer so as to supply power to the charging side DC transformer by performing automatic switching to another distribution line when power supply from one distribution line is cut off. Electric vehicle charging system using DC power system power. The method of claim 1, wherein the second charging switch,
A plurality of power lines branched from an output terminal of the charging side DC transformer to form a second charging switch unit, and the charging port is configured to each of the power lines to which the second charging switch is connected. Electric vehicle charging system using system power. The method of claim 2, wherein the charging terminal,
When the identifier of the charging port is input, it is configured to turn on / off the second switch connected to the charging port corresponding to the identifier of the plurality of second charging switch configured in the second charging switch unit Electric vehicle charging system using DC power system power. The method of claim 2, wherein the charging terminal,
The electric vehicle charging system using DC power system power, characterized in that configured for each charging port connected to the second charging switch to turn on / off the second charging switch individually. The method of claim 2, wherein the charge-side DC transformer,
An electric vehicle charging system using a DC power system power, characterized in that the variable DC transformer. The method of claim 5, wherein the charging terminal,
And a voltage conversion signal configured to output a voltage conversion signal for converting and outputting a voltage to a user input voltage value by the charging side DC transformer. delete 7. The method according to any one of claims 1 to 6,
At least one DC circuit breaker connected between the distribution line and the charging-side DC transformer;
And a protection cut-off controller for selectively blocking the DC circuit breaker by receiving a control signal from the remote monitoring controller for controlling the DC power system. 7. The method according to any one of claims 1 to 6,
The apparatus further includes a charging side rectifier installed at an input terminal receiving power from the DC power system of the EV charging system to receive the AC power supplied from the DC power system, convert the DC power into DC power, and supply the AC power to the EV charging system. Electric vehicle charging system using the DC power system power, characterized in that the. An automatic switching device is provided for selectively driving the power supply by branching two or more branches from an electric vehicle driving or a DC power system of a plant, and a plurality of power lines or DC power branches branched from the DC power system to supply DC power. It is branched from the charging rectifier that receives the AC power of the system and outputs the DC power, and is connected to each power line supplying the DC power. Charge-side DC transformer unit consisting of a charge-side DC transformer of;
A second charging switch unit connected to an output terminal of each of the charging side DC transformers and configured to include a plurality of second charging switches turned on / off according to an on / off signal input from the charging terminal;
A plurality of charging ports connected to each of the second charging switches configured in the second charging switch unit;
A voltage conversion signal connected to the charging side DC transformer unit and the second charging switch so as to drop a voltage to a user input voltage value and output the voltage conversion signal to the charging side DC transformer unit, and connected to the charging port connected to the electric vehicle. And a charging terminal configured to output an on / off signal of a second charging switch to the second charging switch unit and to control the charging of the electric vehicle.

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