KR102413963B1 - Battery charging system of electric vehicle - Google Patents

Abstract

The present invention relates to an electric vehicle charger, comprising: a power supply unit 221 connected to a power grid for supplying various types of power including an intelligent power grid; an earth leakage detector 223 for detecting whether power supplied through the power supply unit 221 is short-circuited; a charging power output unit for supplying the power input from the power supply unit 221 to the electric vehicle 226; an earth leakage circuit breaker 222 for cutting off power transmitted from the power supply unit 221 to the charging power output unit according to the leakage current detected by the earth leakage detector 223 and the control unit 228; a power amount detection unit 224 for detecting the amount of power input from the power supply unit 221; a relay 225 for opening and closing the supply power supplied to the charging power output unit; a battery 240 for supplying electric power charged therein when the earth leakage breaker 222 is off; and the electric power measurement value of the power supply unit 221 measured by the electric leakage detector 223 and the electric energy detection unit 224 is calculated to determine whether there is an electric leakage, and the electric leakage breaker 222 is turned off according to whether there is an electric leakage, and the and a control unit 228 that controls to supply power from the battery 240 to the electric vehicle 226 . The electric vehicle charger of the present invention has the advantage of supplying power from the battery to the electric vehicle to charge the electric vehicle that needs to be charged urgently even when the earth leakage breaker is off.

Description

Electric vehicle charger {BATTERY CHARGING SYSTEM OF ELECTRIC VEHICLE}

The present invention relates to an electric vehicle charger, and to an electric vehicle charger capable of charging an electric vehicle using a battery when the electric vehicle charger does not operate due to a short circuit.

An electric vehicle is a generic term for a vehicle that uses an electric drive motor as a power source and operates the motor by receiving power from the vehicle's storage battery. Electric vehicles are also called electric vehicles (EVs), and electric vehicles are attracting attention from the viewpoint of global warming countermeasures, energy conservation, and CO2 emission, and their distribution in Korea is rapidly progressing.

As part of air pollution improvement, the government announced a green car industry development strategy and electric vehicle development and distribution plan jointly with the Ministry of Environment, the Ministry of Industry and the Ministry of Land, Infrastructure and Transport to promote the supply of electric vehicles and charging facilities from 2010 to actively foster the green car industry. It plans to supply 200,000 electric vehicles by 2020.

In general, electric vehicles do not have an internal combustion engine at all and are developed as electric vehicles driven only by electricity, so they have a range of more than 100 km and hundreds of km on a single charge, but a charger infrastructure plan for charging electric vehicles with external power is essential. For dissemination, it is necessary to first secure charging facilities, so it is necessary to establish a systematic system for this.

This electric vehicle charging infrastructure is largely composed of a system as shown in FIG. 1 with a power supply facility, a charger, an interface, and an information system. In the power supply facility, electrical equipment for supplying power to electric vehicles includes inlet wiring, distribution board, and circuit breaker as a watt-hour meter. It is classified as a fast charger.

Rapid chargers require a lot of power due to their characteristics. A rapid charger that can charge 80 to 90% in 30 minutes consumes a large amount of power of 50 kW, so a substation facility that can supply a large amount of power of 50 kW without any problem. It is a prerequisite that must be provided.

Interfaces also include couplers, cables, etc. that are connected from the charger to supply electricity to the electric vehicle. Here, the coupler is a device that enables the connection between the charging cable and the electric vehicle, and is composed of a connector attached to the charging cable and the inlet of the electric vehicle. The connector is attached to the charging cable and represents a device for connection to the electric vehicle inlet. Also, the inlet is a component of the automobile coupler, and is attached to the electric vehicle and connected to the connector of the charging cable.

The charger serves to supply the electric vehicle's battery with electricity received from an electricity provider such as Korea Electric Power Corporation. There are direct charging, non-contact charging, and battery exchange methods. In the direct charging method, power is supplied by directly connecting the charging port of the electric vehicle and the charger, and the battery installed inside the electric vehicle is recharged to a certain level. By supplying AC 220V to the electric vehicle through a cable to charge the battery of the electric vehicle, the charger of about 3-7kW installed in the vehicle converts the applied AC 220V to DC to charge the battery and charge the battery for 3-10 hours depending on the battery capacity. It takes about 3~7kW and a charger with a power capacity of about 3~7kW is mainly installed. Rapid charging is a method in which the charger exchanges control signals with the vehicle and variably supplies 100 to 450 V of DC or 380 V of AC to charge the battery of an electric vehicle. Since the charger supplies high-capacity power, the 50kW class is mainly installed.

The charging information system collects information on the location and usage of the charger, provides it to electric vehicle users, and monitors the operating state of the charging facility in real time. The interface, charging watt-hour meter, user recognition device and communication terminal device are installed and operated in connection with the electric vehicle charging information system of the Ministry of Environment through the communication device. The communication standard (Protocol) is used.

Power supply for chargers is mainly applied by receiving electricity from KEPCO, but from an environmental point of view, there is also a method of using new and renewable energy that receives power from solar power generation facilities and power generation facilities using waste heat from incineration facilities. In the case of using renewable energy generated power, since the power generation capacity is relatively small, it can be installed to cover all or part of the power required for the slow charger.

On the other hand, charging power for electric vehicles must be received from KEPCO and a separate meter needs to be installed in order to receive power load management and electric vehicle electricity rates. Also, in the case of inlet wiring, the drop-in line can be installed through underground or overhead entry, and the installation method and cost differ depending on the site conditions of the charger installation point. In order to use electricity safely, it is necessary to install an earth leakage breaker or a circuit breaker for wiring, and it should be installed near the charging station so that the electric circuit can be easily operated. For safety, earth leakage breaker is installed in the distribution board to protect machinery and users, and a circuit breaker for overload and short circuit protection is installed in the distribution panel to protect wires and machinery.

Devices using high-voltage power sources, such as electric vehicles, have an insulation problem that must prevent power leakage to external devices. If the insulation state is poor, leakage current occurs, which can lead to damage to the electric vehicle system system, such as battery discharge or malfunction of devices, as well as personal injury due to short circuit. Electric vehicles using high-voltage batteries and charging power can cause fatal electric shock damage to users due to leakage current generated during battery charging. In the system, a safe earth leakage blocking means to prevent accidents by detecting leakage current in advance must be installed.

As shown in FIG. 2 , in general, the electric vehicle charger 12 is equipped with an earth leakage breaker 122 to protect users and vehicles. This earth leakage breaker 122 automatically cuts off power to ensure the safety of the user and the vehicle when a short circuit occurs due to various factors such as a poor surrounding power condition, a humid installation environment, or charging the vehicle's battery. must have

On the other hand, such an earth leakage phenomenon is a very short short circuit caused by the surrounding environment, and even though it is the slightest grade among various earth leakage phenomena, this short-lived leakage causes the earth leakage breaker to turn OFF to cut off the power supply, and thus the service of the electric vehicle charging system is reduced. Because it is stopped, a professional personnel dispatch service is required to recover the earth leakage breaker and analyze the cause, and there is a problem that not only human and material loss but also the operation efficiency of the charger is reduced as the dispatched service personnel has to manually turn on the earth leakage breaker that is turned off do.

An object of the present invention is to solve the above-described problem, and to provide an electric vehicle charger for charging a battery power to an electric vehicle when an electric leakage breaker of an electric vehicle charger is off.

In an electric vehicle charger according to a preferred embodiment of the present invention, a power supply unit 221 connected to a power grid for supplying various types of power including an intelligent power grid; an earth leakage detector 223 for detecting whether power supplied through the power supply unit 221 is short-circuited; a charging power output unit for supplying the power input from the power supply unit 221 to the electric vehicle 226; an earth leakage circuit breaker 222 for cutting off power transmitted from the power supply unit 221 to the charging power output unit according to the leakage current detected by the earth leakage detector 223 and the control unit 228; a power amount detection unit 224 for detecting the amount of power input from the power supply unit 221; a relay 225 for opening and closing the supply power supplied to the charging power output unit; a battery 240 for supplying electric power charged therein when the earth leakage breaker 222 is off; and the electric power measurement value of the power supply unit 221 measured by the electric leakage detector 223 and the electric energy detection unit 224 is calculated to determine whether there is an electric leakage, and the electric leakage breaker 222 is turned off according to whether there is an electric leakage, and the and a control unit 228 for controlling supply of power from the battery 240 to the electric vehicle 226 .

The charger includes a communication module 229 connected to the control unit 228; and a central server system 26 connected to the communication module 229 to monitor charging and management status information of nearby chargers in real time.

The control unit 228 receives distance information of nearby chargers from the central server system 26, calculates the amount of movable power that can move to the distance of the nearby chargers, and based on the movable power amount, the battery 240 ) from the electric vehicle 226, characterized in that the control to be charged.

The charger is connected to the battery 240 and is characterized in that an extra cable for supplying power to the electric vehicle 226 is further provided.

The communication module 229 is, from a nearby charger, a list of nearby charging stations, the current number of standby vehicles of the nearby charging stations, the number of reserved vehicles of the nearby charging stations, the charging time of the currently charged vehicle, the number of broken charging devices or the number of available charging devices information It is characterized in that one or more of the information is received.

The battery 240 is characterized in that it is replaceable.

The control unit 228, when the state of the earth leakage breaker 222 is on, it is characterized in that the control so that power is charged from the power supply unit 221 to the battery 240.

The charger, characterized in that it further comprises a dehumidifier for controlling the humidity.

The control unit 228 may control the dehumidifier to maintain a preset temperature and humidity based on the temperature and humidity values measured by the temperature and humidity sensor.

The present invention is intended to solve the above-described problems, and has the advantage of being able to charge an electric vehicle that needs to be charged urgently by supplying power from the battery to the electric vehicle even when the earth leakage breaker of the electric vehicle charger is off.

1 is a configuration diagram of a typical electric vehicle charging infrastructure.
2 is a schematic configuration diagram of an electric vehicle charger according to the prior art.
3 is a block diagram of an electric vehicle charger according to an embodiment of the present invention.
4 is a configuration diagram of a central server system for an electric vehicle charger according to another embodiment of the present invention.
5 is a flowchart of a battery operation control procedure of a charger according to an embodiment of the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

When an element is referred to as being “connected” or “connected” to another element, it is understood that it may be directly connected or connected to the other element, but other elements may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “comprises” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. It is apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

However, in the electric vehicle charger described with reference to FIGS. 3 to 5 below, only the necessary components are shown in introducing the characteristic functions according to the present invention, and various other components are shown in FIGS. 3 to 5 It is apparent to those of ordinary skill in the art to which the present invention pertains.

3 is a block diagram of an electric vehicle charger according to an embodiment of the present invention.

Referring to FIG. 3 , the electric vehicle charger 22 according to an embodiment of the present invention includes a power supply unit 221 , an earth leakage detector 223 , a charging power output unit, an earth leakage breaker 222 , and an electric energy detection unit 224 . , a relay 225 , a battery 240 , and a control unit 228 .

The power supply unit 221 is connected to a power grid for supplying various types of power including an intelligent power grid.

The earth leakage detector 223 detects whether the electric power supplied through the power supply unit 221 is short-circuited.

The charging power output unit supplies the power input from the power supply unit 221 to the electric vehicle 226 .

The earth leakage breaker 222 cuts off the power transmitted from the power supply unit 221 to the charging power output unit according to the leakage current detected by the earth leakage detector 223 and the control unit 228 .

The power amount detection unit 224 detects the amount of power input from the power supply unit 221 .

The relay 225 opens and closes the supply power supplied to the charging power output unit.

The battery 240 supplies the electric power charged therein to the electric vehicle 226 when the earth leakage breaker 222 is off. In this case, the battery 240 is also connected to the relay 225 .

The control unit 228 calculates the electric power measurement value of the power supply unit 221 measured by the electric leakage detector 223 and the electric energy detection unit 224 to determine whether there is an electric leakage, and according to whether there is an electric leakage, the electric leakage breaker 222 is operated. off, and control to supply power from the battery 240 to the electric vehicle 226 .

In general, when there is no earth leakage, the current input from the power supply unit 221 flows toward the electric vehicle 226 through the earth leakage breaker 222, the earth leakage detection unit 223, the electric power amount detection unit 224, and the relay 225, and then all the power is supplied. Although it is returned to the supply unit 227 again, when a leakage current occurs, some of the flowing current cannot be returned, so the amount of the returned current is measured by the leakage detection unit 223 to detect a leakage current.

The control unit 228 of the control unit 230 sets a reference value of the earth leakage current in advance, and when a value greater than that is generated, the earth leakage breaker 222 is turned OFF.

At this time, in the electric vehicle charger 22 of the present invention, when the earth leakage breaker 222 is OFF, the controller 228 controls to supply the power charged in the battery 240 to the electric vehicle 226 .

The charger 22 may further include an extra cable that is connected to the battery 240 and supplies power to the electric vehicle 226 . The cable may be separately provided inside the main body of the charger 22 . In the case of a short circuit, an electric leakage due to an error inside the main body of the charger 22 and an incorrect grounding in a cable connected to the electric vehicle may cause a short circuit. Among them, in the case of a short circuit due to the grounding of the cable connected to the electric vehicle, it may be connected to the electric vehicle using a cable provided in the main body of the charger 22 .

Also, the battery 240 may be of a replacement type. When the earth leakage breaker 222 is turned off due to a short circuit, the battery 240 supplies power to the electric vehicle. In this case, when the battery 240 is discharged or its lifespan has expired, the battery 240 may be removed and replaced for use.

In addition, when the state of the earth leakage breaker 222 is on, the control unit 228 controls so that power is charged from the power supply unit 221 to the battery 240 .

4 is another embodiment according to the present invention, wherein the electric vehicle charger of the present invention is connected to the communication module 229 connected to the control unit 228 and the communication module 229 to display charging and management status information of nearby chargers. It may further include a central server system 26 for real-time monitoring.

The central server system 26 includes a central server 261 and a management database 265 for real-time monitoring and remote control of charging and management status information of each local charger 22 , a manager terminal 263 , and a communication module 262 . ) is composed of

The communication module 229 of the electric vehicle charger 22 receives a list of nearby charging stations from the communication module 262 of the central server system, the current number of vehicles on standby at nearby charging stations, the number of reserved vehicles at nearby charging stations, and the charging of vehicles currently being charged. Any one or more information of the required time, the number of broken charging devices, or the number of available charging devices is received.

The communication module 229 of the electric vehicle charger 22 of FIG. 4 and the communication module 262 of the central server share the charging and management status data (location, status, electric leakage, etc.) of each local charger in real time and centrally The server 261 monitors the state of the charger 22 and maintains and updates each charger management program. (25) It is a system for integrated management and operation of charger information by managing the payment and payment approval information 241 together in connection with the terminal.

All management states, including leakage blocking occurring in the electric vehicle charger 22, are transmitted to the central server 261 through the communication module and stored in the management database 265, and the administrator can check the status of each charger displayed through the terminal 263. In addition to real-time monitoring, remote management is possible through a wired/wireless communication network through the manager's smart terminal 264 .

At this time, the communication module 229 of the electric vehicle charger 22 receives distance information of nearby chargers from the communication module 262 of the central server system 26, and the control unit 228 moves to the distance of the nearby chargers. The amount of movable electric power that can be moved is calculated, and control is performed to charge the electric vehicle from the battery based on the amount of movable electric power.

More specifically, when the electric vehicle charger 22 of the present invention is short-circuited and the earth leakage breaker 222 is turned off, the control unit 228 controls to supply power from the battery 240 to the electric vehicle 226 . At this time, the control unit 228 controls to charge the electric vehicle 226 by the calculated amount of movable electric power. Thereafter, the user of the electric vehicle 226 may move to a nearby electric vehicle charging station to perform normal charging. Since the capacity of the battery 240 is limited, it is difficult to charge many electric vehicles. Therefore, according to the present invention, many electric vehicles can be charged by charging an electric vehicle by the amount of electric power that can be moved to a nearby charging station.

In addition, the electric vehicle charger 22 of the present invention may further include a dehumidifier (not shown) for controlling humidity. This controls to adjust the preset humidity to prevent leakage due to humidity inside the charger body. That is, the electric vehicle charger 22 of the present invention further includes a temperature and humidity sensor. In this case, the control unit controls the dehumidifier to maintain preset temperature and humidity based on the temperature and humidity values measured by the temperature and humidity sensor.

5 is a flowchart of a battery operation control procedure of a charger according to an embodiment of the present invention.

As shown in FIG. 5 , when the charging service is started, the earth leakage detection unit 223 detects whether the supply power is short-circuited (S10).

Depending on whether an earth leakage occurs, the earth leakage breaker is turned OFF when an earth leakage occurs (S20), and if not, the charging service is normally performed (S60).

When the earth leakage breaker is OFF, the control unit 228 calculates the amount of movable power that can move to the distance of nearby chargers (S30).

Thereafter, the control unit 228 controls the supply of power from the battery 240 to the electric vehicle 226 to charge the electric vehicle 226 ( S40 ). At this time, the control unit 228 checks the amount of power of the battery 240 ( S50 ), and when it is discharged, immediately stops the charging service, and if the battery 240 is not discharged, the electric vehicle charges only the movable power amount. control (S60). In addition, when the electric vehicle is charged by the amount of movable electric power, the control unit 228 completes the charging (S70).

Although the above-described embodiment has been described with respect to a preferred embodiment of the present invention, the present invention is not limited thereto, and it is specified that it can be changed and implemented in various forms without departing from the technical spirit of the present invention. .

22: electric vehicle charger
23: Electricity service operator
24: Payment service operator
25: Customers using the charger
26: electric vehicle charger central server system
121: power supply
122: earth leakage breaker
123: wattage detection unit
124: relay
125: charging power output
126: DC power supply
127: control unit
128: communication module
129: control unit
221: power supply
222: earth leakage breaker
223: DC/AC leakage detection unit
224: wattage detection unit
225: relay
226: electric vehicle
227: DC power supply
228: control unit
229: communication module
230: control unit
240: battery
241: payment approval data
261: central server
262: communication module
263: manager terminal
264: manager smart terminal
265: management database

Claims (9)

In an electric vehicle charger,
a power supply unit 221 connected to a power grid for supplying various types of power including an intelligent power grid;
an earth leakage detector 223 for detecting whether power supplied through the power supply unit 221 is short-circuited;
a charging power output unit for supplying the power input from the power supply unit 221 to the electric vehicle 226;
an earth leakage circuit breaker 222 for cutting off power transmitted from the power supply unit 221 to the charging power output unit according to the leakage current detected by the earth leakage detector 223 and the control unit 228;
a power amount detection unit 224 for detecting the amount of power input from the power supply unit 221;
a relay 225 for opening and closing the supply power supplied to the charging power output unit;
a battery 240 for supplying electric power charged therein when the earth leakage breaker 222 is off;
The electric leakage detector 223 and the electric energy detection unit 224 calculate the electric power measurement value of the power supply unit 221 to determine whether there is an electric leakage, and turn off the electric leakage breaker 222 according to whether there is an electric leakage, and turn off the battery. a control unit 228 controlling to supply power from 240 to the electric vehicle 226;
It is connected to the control unit 228 and is connected to a list of nearby charging stations from nearby chargers, the number of current standby vehicles at nearby charging stations, the number of reserved vehicles at nearby charging stations, the charging time of vehicles currently being charged, the number of broken charging devices or the number of available charging devices a communication module 229 for receiving any one or more of the information; and
A central server system 26 that is connected to the communication module 229 and monitors the charging and management status information of nearby chargers in real time; includes;
The control unit 228 is
When the electric vehicle charger is short-circuited and the earth leakage breaker 222 is off,
Receiving distance information of nearby chargers from the central server system 26,
By calculating the amount of mobile power that can be moved to the distance of the nearby chargers,
Controlling to supply power of the battery 240 to the electric vehicle 226 to be charged by the calculated amount of movable electric power,
The electric vehicle charger,
In case of a short circuit due to the grounding of the cable connected to the electric vehicle, the battery 240 and the electric vehicle 226 are connected to supply power to the electric vehicle 226 using an extra cable further provided inside the main body of the electric vehicle charger. An electric vehicle charger comprising those connected to each other. delete delete delete delete According to claim 1,
The battery 240 is
Electric vehicle charger, characterized in that the replacement method. According to claim 1,
The control unit 228,
When the state of the earth leakage breaker (222) is on, the electric vehicle charger, characterized in that the control so that power is charged from the power supply (221) to the battery (240). According to claim 1,
The charger is
Electric vehicle charger, characterized in that it further comprises a dehumidifier for controlling humidity. 9. The method of claim 8,
The control unit 228,
An electric vehicle charger, characterized in that the dehumidifier is controlled to maintain a preset temperature and humidity through the temperature and humidity values measured by the temperature and humidity sensor.

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