KR101170079B1 - Charging system of electric vehicle using ac power - Google Patents

Abstract

The present invention discloses an electric vehicle charging system capable of charging an electric vehicle using AC power. The disclosed electric vehicle charging system includes at least two input terminals connected to different distribution lines for supplying AC power, and an output terminal connected to the input terminal of the charging-side DC transformer. An automatic switching device for supplying power to the charging-side DC transformer by performing automatic switching to another distribution line when the power supply is cut off; and being connected to an output terminal of the automatic switching machine to receive AC power and converting into DC power A charging side rectifier for supplying the electric vehicle charging system to the electric vehicle charging system; and a DC circuit breaker connected to an output terminal of the charging side rectifier; and a protection circuit controller for selectively blocking the DC circuit breaker by receiving an external control signal. By varying the DC power input is connected to at least one power line branched at the output terminal of the DC circuit breaker At least one charging side DC transformer; and at least one second charging switch connected to each of at least one power line branched from an output terminal of the charging side DC transformer; and the second charging switch. At least one charging port connected to the second charging switches by storing an identifier corresponding to each of the plurality of charging ports; and a plurality of second charging switches configured in the second charging switch unit when an identifier of the charging port is input. And a charging terminal configured to control charging of the electric vehicle by turning on / off a second switch connected to the charging port corresponding to the identifier, thereby reducing the installation cost of the electric vehicle charging system and generating an overload of a commercial power supply. It is possible to charge various types of electric vehicles with different power input values for charging by using one charging port. By doing so, it is possible to increase the charging efficiency of the electric vehicle.

Description

Charging system of electric vehicle using AC power {CHARGING SYSTEM OF ELECTRIC VEHICLE USING AC POWER}

The present invention relates to an electric vehicle charging system that enables charging of an electric vehicle using AC 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 AC 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 alternating current 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 AC power having various charging voltage values.

The electric vehicle charging system of the present invention for achieving the above object is at least two or more input terminals connected to different distribution lines for supplying the AC power of the DC power system, and an output terminal connected to the input terminal of the charging-side DC transformer It is configured to include, when the power supply from one distribution line is cut off automatic switching to supply power to the charging side DC transformer by performing automatic switching to the other distribution line; and, the output stage of the automatic switching machine A charging side rectifier connected to an AC power source and converted into a DC power source and supplied to an electric vehicle charging system; and a DC circuit breaker connected to an output terminal of the charging side rectifier; and a DC signal received from an external control signal. A protective circuit breaker for selectively breaking the circuit breaker; and at least one branching at an output of the DC circuit breaker. At least one charging side DC transformer connected to a raw line and outputting a variable DC power supply; and at least one second charging switch connected to at least one power line branched at an output terminal of the charging side DC transformer. A charging switch unit; and one or more charging ports storing identifiers corresponding to each of the second charging switches and connected to the second charging switches; and the second charging switch unit when an identifier of the charging port is input. And a charging terminal configured to control charging of the electric vehicle by turning on / off a second switch connected to a charging port corresponding to the identifier among a plurality of second charging switches.

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.

An electric vehicle charging system according to still another aspect of the present invention includes at least two or more input terminals connected to different distribution lines for supplying AC power of the DC power system, and an output terminal connected to the input terminal of the charging-side DC transformer. And an automatic switching device for supplying 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; and connected to an output terminal of the automatic switching machine. A charging side rectifier for converting the AC power into a DC power supply and supplying the same to an electric vehicle charging system; and a DC circuit breaker connected to an output terminal of the charging side rectifier; and a DC circuit breaker receiving an external control signal. A protective cut-off controller for selectively blocking; and a power line branched from the DC breaker to supply DC power A charging-side DC transformer unit configured of a plurality of charging-side DC transformers for reducing and outputting a DC power input and connected in response to a voltage conversion signal input from a charging terminal; and connected to each output terminal of the charging-side DC transformers. And a second charging switch unit including a plurality of second charging switches that are turned on / off according to an on / off signal input from the charging terminal; and for each second charging switch configured in the second charging switch unit. A plurality of charging ports connected to each other; and 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; Outputting an on / off signal of a second charging switch connected to the charging port connected to the vehicle to the second charging switch unit; Characterized in that the configuration including; charging device for controlling the amount of charge.

According to the present invention, it is possible to charge the electric vehicle using AC power, thereby reducing the occurrence of overload during commercial power supply.

In addition, the present invention is to be able to charge the electric vehicle by using the AC power, it is not necessary to provide a power transformer or rectifier, such as a transformer or rectifier for converting AC power to DC power when installing an electric vehicle charging station electric vehicle It facilitates the installation of the 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 to 8 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 to 4.

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 to 8 are diagrams showing that the automatic switch 111 and the protection cut-off controller 112 are installed in the electric vehicle charging system 100a, 100b, 100c, and 100d of FIGS. 1 to 4.

The automatic switch 111 is a supply of charging power supply to the electric vehicle charging system (100a) more than the power equipment (transformer, rectifier, DC high-speed circuit breaker, etc.) of one distribution line (Ld) If not possible, it is automatically switched so that the power can be supplied through another distribution line Ld connected to the automatic switch 111.

The protection circuit breaker 112 is a power facility of the distribution line (Ld) for supplying power to the electric vehicle in the state that power is supplied to the electric vehicle charging system (100a, 100b, 100c, 100d) through the subway power system (S) When an abnormal condition such as a failure occurs and power is to be supplied from the distribution line Ld that supplies power to the electric vehicle charging systems 100a, 100b, 100c, and 100d, the electric vehicle charging systems 100a, 100b, 100c, and 100d. Control command from SCADA (Supervisory Control and Data Acquisition) of the command room that centrally controls subway lines in case power supply to electric vehicles is not smooth due to power supply for charging electric vehicles By blocking the DC circuit breaker 110, the electric vehicle charging power supplied to the electric vehicle charging system (100a, 100b, 100c, 100d) can be temporarily blocked.

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 100b of the second embodiment of the present invention as shown in FIG. 6, 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 charging measuring instrument. Is connected to an input terminal of 180.

In the electric vehicle charging system 100c of the third embodiment of the present invention, as shown in FIG. 7, the automotive circuit breaker 111 is connected so 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.

In the electric vehicle charging system 100d of the fourth embodiment of the present invention as shown in FIG. 8, 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 charging measuring instrument. Connected to 180.

The protection circuit breaker 112 is connected to independently control the respective DC circuit breakers 110 in the electric vehicle charging systems 100a, 100b, 100c, and 100d of the first to fourth embodiments as shown in FIGS. Each DC circuit breaker 110 is configured to temporarily block the DC circuit breakers 110 according to a control signal input from a SCADA.

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

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

In addition, since the AC power supplied to the electric vehicle charging power system of the present invention may use AC power supplied to a large capacity DC power supply system other than the AC power supplied to the railroad vehicle driving DC power system, An electric charging system for charging an electric vehicle by receiving an AC power supplied to a DC power system for supplying the battery is also within 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 (4)

An automatic switcher for automatically switching to supply power to another distribution line when one distribution line to which power is supplied is cut out among a plurality of input terminals connected to different distribution lines for supplying AC power; and,
A charging-side rectifier connected to an output terminal of the automatic transfer device and receiving an AC power and converting the same into a DC power;
A charging-side DC circuit breaker connected to an output terminal of the charging-side rectifier;
A protection block controller for selectively blocking the charging side DC circuit breaker;
At least one charging side DC transformer connected to at least one power line branched at an output terminal of the charging side DC circuit breaker to variably output the input DC power;
A protection relay connected to an output terminal of each of the charging-side DC transformers and configured with an overcurrent relay, a ground relay, and the like;
First charging switches connected to respective output terminals of the protective relay;
A second charging switch unit including one or more second charging switches connected to one or more power lines branched from an output terminal of the charging-side DC transformer;
A plurality of connector-type charging ports storing identifiers corresponding to each of the second charging switches and connected to the second charging switches;
When the identifier of the charging port is input, the charging of the electric vehicle is controlled by turning on / off a second switch connected to the charging port corresponding to the identifier among the plurality of second charging switches configured in the second charging switch unit. And a charging terminal connected to the charging-side DC transformer and controlling an output voltage conversion value of the voltage conversion signal transmitted to the charging-side DC transformer. The method of claim 1, wherein the charge-side DC transformer,
Electric vehicle charging system using AC power, characterized in that consisting of a variable voltage DC transformer. delete An automatic switcher for automatically switching to supply power to another distribution line when one distribution line to which power is supplied is cut out among a plurality of input terminals connected to different distribution lines for supplying AC power; and,
A charging-side rectifier connected to an output terminal of the automatic transfer device and receiving an AC power and converting the same into a DC power;
A charging-side DC circuit breaker connected to an output terminal of the charging-side rectifier;
A protection block controller for selectively blocking the charging side DC circuit breaker;
Charge-side DC transformer composed of a plurality of charge-side DC transformer branched from the charge-side DC circuit breaker connected to each power supply line for supplying DC power to reduce the output DC power in accordance with the voltage conversion signal input from the charging terminal Wealth;
A plurality of protection relays connected to output terminals of the plurality of charging-side DC transformers and configured to include an overcurrent relay and a ground relay;
A plurality of first charging switches connected to an output terminal of each of the plurality of protection relays;
A second charging switch unit connected to each output terminal of the charging-side DC transformer and configured by a plurality of second charging switches driven according to an on / off signal input from the charging terminal;
A plurality of connector-type charging ports connected to each second charging switch of the second charging switch unit;
Connected to the charging-side DC transformer unit and the second charging switch, respectively, to control an output voltage conversion value of a voltage conversion signal transmitted to the charging-side DC transformer unit, and to turn on / off the signal of the second charging switch and the And a charging terminal for controlling the charging of the electric vehicle connected to the charging port and controlling the output voltage conversion value of the voltage conversion signal transmitted to the charging side DC transformer connected to the charging side DC transformer. Electric vehicle charging system using AC power.

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