KR20190030127A - An apparatus and method for circuit breaker restoring by power failure detection remotely for battery charging system of electric vehicle - Google Patents

Abstract

The present invention relates to the operation and recovery of an earth leakage breaker due to an instantaneous short circuit generated when an electric car charger is in use. More specifically, the present invention identifies a cause of an instantaneous short circuit phenomenon without artificial aftersales service dispatch and any service personnel operation even when an off operation of the earth leakage breaker due to an instantaneous short circuit in an electric car charger causes the supply of power to the electric car charger to be blocked and then automatically recovers the earth leakage breaker of the electric car charger. In addition, the present invention relates to an apparatus and method for automatically recovering an earth leakage breaker of an electric car charger having the earth leakage breaker with an earth leakage protection and automatic recovery function not only for alternating current like a conventional earth leakage breaker but also for direct current. In addition, the apparatus for automatically recovering an earth leakage breaker of an electric car charger comprises a central server system including a central server collecting various data of local electric car chargers, a management database, and an administrator terminal. According the administrator terminal the central server transmits management information thereof to a smart terminal for an administrator through wire/wireless communication lines, and receives a control command from the smart terminal for an administrator such that the smart terminal for an administrator remotely controls the local electric car chargers through a communication module of the central server.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for automatically recovering an electric circuit breaker of an electric vehicle charger,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation and recovery of an earth leakage breaker caused by a short-circuiting occurring during use of an electric vehicle charger, and more particularly, / S It is a configuration that causes the instantaneous short-circuiting phenomenon without operation of the dispatching and service personnel due to the transient phenomenon and automatically restores if there is no continuous short-circuiting phenomenon.

70 ~ 80% of the number of A / S dispatches of electric car charger is the OFF operation phenomenon of the earth leakage breaker due to instantaneous leakage. However, the instantaneous short circuit is caused by various causes such as lightning, power noise, frequent occurrence of faults, and the causes of faults are very slight. As the number of times of A / S dispatch for recovering the faults is increased, the service personnel expenses are increased, The service stop time of the electric vehicle charging system from the time to the service person's recovery time is increased, and as a result, the efficiency of charging system of the electric vehicle is lowered and the economic waste is cumulatively accumulated due to the frequent leakage of electric current due to a slight cause, .

By knowing whether or not the cause of the OFF state of the circuit breaker of the electric car charger is caused by the instantaneous short circuit, in case of the OFF operation by the instantaneous short circuit, by automatically restoring the charger by itself, the number of times of service of the A / S service personnel is drastically reduced, It is possible to replace the service hours of the service personnel by 24 hours, and the charger can automatically restore the breaker by itself when a short-circuit is occurred. As a result, And more particularly, to an apparatus and method for automatically recovering an electric leakage circuit breaker of an electric car charger that solves the problem of restoring the electric leakage circuit breaker due to a short circuit when the electric current occupies 70% to 80% or more of the electric leakage current.

In addition, the present invention relates to an apparatus and method for instantaneous leakage current restoration of an electric car charger equipped with an earth leakage breaker having an instantaneous earth leakage automatic recovery function for AC and DC electricity, not an ordinary earth leakage breaker limited to an AC electricity will be.

An electric car is a general term of an automobile which uses an electric drive motor as a power source, and receives electric power from a battery of an automobile to drive the motor. Electric vehicles are also referred to as EVs (electric vehicles). Electric vehicles are attracting attention from the viewpoint of global warming countermeasures, energy saving, and CO2 emissions.

As part of the improvement of air pollution, the government announced the development of green car industry development plan and electric vehicle development plan together with relevant ministries such as Ministry of Environment, Ministry of Industry and Ministry of Land and Transportation to supply electric cars and filling facilities from 2010 in order to positively foster green car industry. And will supply 200,000 electric cars by 2020.

Generally, an electric car does not have an internal combustion engine but it is developed as an electric car driven by electricity. Therefore, it is necessary to plan a charger infrastructure to charge an electric car with external power source, It is necessary to establish a systematic system in order to secure the charging facility in order to supply.

Such an electric vehicle charging infrastructure is largely composed of a power supply facility, a charger, an interface, and an information system as shown in FIG. In electric power supply equipment, it is electric equipment to supply electric power to the electric car, and includes wired wiring, distribution board, wiring breaker, etc. as a watt hour meter. The charger is supplied with 380V in three phase and four wire type, Fast-charging charger.

Rapid charger requires very high power due to its characteristics. Rapid charger, which can charge 80 ~ 90% in 30 minutes, consumes a large power of 50kW. Therefore, power supply facility It is a precondition.

The interface also includes a coupler, cable, etc., which are connected to provide electricity to the electric vehicle at the charger. Here, the coupler is a device for connecting a charging cable and an electric car, and is composed of a connector attached to a charging cable and an inlet of an electric car. The connector is attached to the charging cable and represents a device for connecting to an electric vehicle inlet. The inlet is a part of the automobile coupler, which is attached to the electric car and connected to the connector of the charging cable.

The charger supplies electric power from the electric power supplier such as KEPCO to the battery of the electric car, and there are direct charging, non-contact charging, and battery exchange. The direct charging method connects electric charger and charger directly to supply electric power. The battery installed in the electric car is recharged to a certain level, and it is divided into a slow charge and a fast charge according to the charge time. The slow charge is connected to the charger By charging 220V to the electric car through the cable, the battery of the electric car is charged. It converts the AC 220V, which is about 3 ~ 7kW charger installed in the vehicle, to DC and charges the battery. And a charger having a power capacity of about 3 to 7 kW is mainly installed. Rapid charging is a charging method in which the charger sends and receives control signals to and from the car, and the battery of the electric car is charged by variable supply of DC 100-450 V or AC 380 V. The charge time is short due to high voltage and high capacity and takes about 15-30 minutes depending on the battery capacity Since the charger supplies a high capacity electric power, a 50kW class is mainly installed.

The charging information system is a system that collects information on the location and use state of the charger and provides it to the user of the electric car and monitors the operating state of the charging facility in real time. The charger (rapid) installed in the public charging facility includes a charging function of the electric car, , A charging watt hour meter, a user recognition device, and a communication terminal device, and is operated in conjunction with the environment charge information system of the Ministry of Environment through a communication device, and communicates with the central charging information system server The protocol will be used.

Electricity supply of charger is mainly applied from KEPCO. However, there is also a way to utilize renewable energy supplied from power generation facilities using solar power generation facilities and waste heat of incineration facilities in terms of environment. When the renewable energy generation power is utilized, since the generation capacity is relatively small, it can be installed so as to cover all or part of the electric power required for the slow charger.

Meanwhile, the charging electric power of the electric car should be used by receiving electric power from KEPCO for the electric power load management and the electricity charge for the electric car, and it is necessary to install a separate meter. In addition, in the case of the inlet wiring, the inlet line can be installed by the ground and the processing inlet, and the installation method and the cost are different according to the field conditions of the charging installation site. Installation of distribution boards requires the installation of circuit breakers or circuit breakers which are necessary for the safe use of electricity and shall be installed near the charging stations to facilitate the operation of the electric circuits. For safety, the earth leakage breaker shall be installed in the distribution board for the protection of machinery and users, and the earth leakage breaker for both overload and short circuit protection shall be installed. The circuit breaker shall be installed in the distribution board to protect the wires and machinery.

Devices using high voltage power sources, such as electric vehicles, have insulation problems that must prevent leakage of power to external devices. If the insulation condition is not good, a leakage current is generated. This may lead to failure of the system of the electric car system such as battery discharge and malfunction of the devices, as well as damage due to electric leakage. An electric vehicle using a high voltage battery and a rechargeable battery can cause a deadly electric shock to the user due to a leakage current generated when the battery is charged. Therefore, the detection and interception of an electric leakage is the most important factor for safety of life and an electric car. In the system, it is necessary to install a safe earth leakage prevention device that detects leakage current and prevents accidents.

Generally, the electric car charger is equipped with a circuit breaker for user and vehicle protection. This circuit breaker automatically cuts off the power to ensure the safety of the user and the vehicle when there is a momentary short circuit due to various factors such as poor electric power environment, humid installation environment, Must have.

This short-circuiting short-circuit is a very short leakage caused by the surrounding environment, and even though it is the mildest among several short-circuiting phenomena, short-circuiting of the short- Therefore, there is a problem that the service efficiency of the charger is lowered as well as human and material loss that must be manually turned on for the earth leakage breaker which is turned off by the dispatched service personnel in order to recover the earth leakage breaker and analyze cause thereof do.

At present, 70 ~ 80% of A / S activators of electric car chargers are mildly rated instantaneous leakage, resulting in the circuit breaker being off. Due to this slight level of leakage, the charger service company will not only waste human and material for the A / S dispatch, but also inconvenience that the charging service will be stopped to the customers using the charging system, , Resulting in economic loss.

(Hereinafter referred to as "B-type earth leakage circuit breaker") and AC / DC reactive type earth leakage breaker (hereinafter referred to as "A-type earth leakage breaker" The B-type earth leakage breaker has already been commercialized as an automatic earth leakage breaker with automatic recovery function for instantaneous leakage. However, A-type earth leakage breaker has not yet implemented automatic recovery function for instantaneous leakage .

Especially, in the international standard of electric car, it is compulsory to use A-type earth leakage breaker, but there is a problem that there is no automatic leakage recovery function in electric car charger equipped with A-type earth leakage breaker according to international standards. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a circuit breaker for an electric vehicle charger, By automatically recovering power, it is possible to dramatically reduce the number of A / S service personnel dispatched, eliminate the distance and time cost of remote service area, and replace service personnel out of work hours, , Real-time surveillance control becomes possible, so it not only realizes unmanned car charger, but also causes electric leakage circuit breaker off due to instantaneous short circuit which accounts for 70 ~ 80% of A / S causes of charger of electric car charger. Quick recovery without distinction of distance and service time And further it has a self-healing circuit breaker apparatus and method of the electric charger to facilitate maintenance of the unmanned electric vehicle chargers for the purpose of providing.

The present invention is also applicable to an earth leakage breaker (A-type earth leakage breaker) having an automatic instantaneous leakage current recovery function for alternating current and direct current electricity, not a general earth leakage breaker (B-type earth leakage breaker) The present invention also provides an apparatus and method for automatically recovering an electric leakage from an electric car charger that meets international electric vehicle regulations.

In order to achieve the above object, the present invention discloses a short circuit breaker for an electric vehicle charger.

As an example of an electric vehicle charging system according to the present invention, an electric vehicle charger earth leakage preventing device includes a power supply unit; Earth leakage breaker for earth leakage protection; A direct current and alternating current leakage detection unit for detecting alternating current leakage and direct current leakage; A power amount measuring unit; Relay for supplying power ON / OFF; A charging power output unit (electric car); A control unit including a wired / wireless communication module and a control unit; And a DC power supply unit for supplying power to the control unit.

The control unit may control the first power supply to cut off the supply of the charging power through the first circuit breaker when the leakage detector detects AC or DC leakage.

Also, the power source of the control unit is provided with a power conversion unit to be driven by a separate DC power source using the AC power input through the power supply unit.

The electric leak detecting unit detects the electric leakage of the direct current and the alternating current. The electric leakage breaker may be an A-type electric leakage breaker which can block the direct current leakage, not the B-type electric leakage breaker.

Another example according to the present invention includes a power supply unit; Earth leakage breaker; An AC and DC leakage current detection unit; A power amount measuring unit; relay; A charging power output unit; A control unit; A power converter; A central server system for collecting various data of the local electric car charger (such as the location and condition of the charger, and the occurrence status of leakage), a central server system comprising a management database and an administrator terminal; In the administrator terminal, the central server transmits the management information of the central server to the manager's smart terminal through the wired / wireless communication line, receives the control command from the manager's smart terminal, and remotely communicates the local charger through the communication module of the central server And an administrator smart terminal for controlling the terminal.

The communication device used by the charging information system can be operated in connection with the data communication standard established by the related department such as the environment department or the industrial department, and the common data communication network of the electric car charging information system.

According to the present invention as described above, in order to solve frequent A / S trips of the electric leakage breaker due to the instantaneous electric leakage exceeding 80% of the cause of the failure of the electric car charger, It is possible to check the cause of the short circuit, and if there is a momentary short-circuiting phenomenon that is not a dangerous level or a continuous short-circuiting state, it immediately restores the earth leakage breaker and restarts the charging system of the electric car, The charger service provider can reduce the human and material expenses for A / S dispatch, and can provide economic benefits to both charger users and operators.

1 is a block diagram of a general 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 of an electric car charger according to another embodiment of the present invention.
5 is a flowchart of a procedure in which the control unit of the present invention detects a short circuit and controls the operation of the circuit breaker.

Hereinafter, a configuration according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the present specification, in order to clearly explain the technical idea of the present invention, in an electric vehicle charger that supplies alternating current and direct current power for charging an electric vehicle, an electric leakage detecting unit for detecting a direct current and an alternate current leakage component, And a configuration of an electric car charger having an A-type earth leakage blocking function which is composed of a control unit and a communication module will be described.

FIG. 2 is a schematic configuration diagram of an electric car charger according to the related art. When the electric leakage circuit breaker 122 is turned off, the contacts of the power supply unit 121 are physically disconnected, In order to resume the power supply, a service person must be dispatched to manually return the earth leakage breaker 122 to the ON state.

In order to solve the inconvenience of manually turning OFF the operation of the earth leakage breaker 122 of the charger 12, there has been developed a system for automatically restoring the earth leakage breaker to ON. However, these systems are B-type earth leakage breakers, The A-type earth leakage breaker which blocks the DC component leakage such as the electric car charger is only commercialized as a dedicated earth leakage breaker and does not have automatic recovery function. Therefore, when the A-type earth leakage breaker of the electric car charger is OFF, .

FIG. 3 is a block diagram of an electric vehicle charger 22 according to an embodiment of the present invention. The electric power charger 22 includes an electric power supply unit 221, an earth leakage breaker 222 for interrupting electric leakage, an electric leakage detection unit 223 for detecting AC leakage, A control unit 230 including a power amount measuring unit 224, a power supply ON / OFF relay 225, a charging power output unit 226, an electric vehicle, a wired / wireless communication module 228 and a control unit 229, And a direct current power supply unit 227 for supplying power. The circuit is configured to automatically recover without an artificial manual recovery procedure when the earth leakage breaker 225 is turned off for AC and DC component leakage.

The power supply unit 221 of FIG. 3 includes a power grid system such as KEPCO, which generally produces and supplies electricity, and means for producing and supplying electricity, and supplies power to the electric car charger 22 of the present invention All of the power supply means are electric power supply companies supplying and selling the produced electricity and at least one of the renewable energy processing systems supplying electricity generated from new and renewable energy such as hydroelectric power, solar energy, wind heat, geothermal energy, It is possible to receive electricity from the power supply source including the above, and to be supplied with electricity by being connected with the smart grid, which means the smart power system and its management system.

The current input from the power supply unit 221 flows toward the electric vehicle 226 through the earth leakage breaker 222, the direct current / AC leakage detection unit 223, the power amount detection unit 224, and the relay 225 Current leakage detector 223 as much as the current that can not be returned since some of the currents flowing in the circuit are not recovered when a short circuit occurs, .

Also, the direct current / acurrent leakage detection unit 223 measures instantaneous leakage current value and calculates the instantaneous leakage current value by the control unit so that instantaneous leakage monitoring is possible.

Therefore, the control unit 228 of the control unit 230 sets the reference value of the leakage current in advance, and turns off the leakage circuit breaker 222 when a higher value is generated.

The control unit 228 monitors whether or not the power source is recovered from the time when the earth leakage breaker 222 is turned off through the direct current / AC leakage detection unit 223, and when a short circuit occurs for a short time within a predetermined time, The electric leakage breaker 222 is automatically returned to the ON state to restart the operation of the charger.

4 is a block diagram illustrating another embodiment of the present invention in which a central server 261, a management database 265, an administrator terminal 263, and a management server 263 for monitoring and remotely controlling charge and management status information of each local charger 22, And a communication module 262. As shown in FIG.

The communication module 229 of the electric car charger 22 and the communication module 262 of the central server of FIG. 4 share charging and management state data (location, state, short circuit, etc.) The server 261 monitors the status of the charger 22 and performs charger operation management for maintaining and renewing each charger management program and the server of the charging service operator 24, (25) a charging and payment approval information (241) associated with the terminal to manage the charger information integrally.

As shown in FIG. 4, all the management states including the electric leakage charge interruption occurring in the electric car charger 22 are transmitted to the central server 261 through the communication module, stored in the management database 265, Not only the status of each charger displayed through the smart terminal 264 can be monitored in real time but also remotely through a smart phone 264 through a wired / wireless communication network.

FIG. 5 is a flowchart of an operation of controlling the operation of the controller for detecting an electrical leak and the operation of an electrical leakage circuit breaker according to an embodiment of the present invention.

As shown in FIG. 5, when charging service is started, the direct current / acurrent leak detection unit 223 detects whether or not the power supply is short-circuited (S31).

If a short circuit occurs, the circuit breaker is turned off (S32). If not, the charging service is normally performed (S37).

If the electric leakage state is continued after the electric leakage circuit breaker is turned OFF (S33), the controller 228 informs the electric leakage occurrence information through the communication module 229 (S34) (S35), the electric leakage circuit breaker is restored to the ON state (S36), the charging service is normally performed (S37), and the charging procedure is completed (S38).

21: electric car 22: electric car charger
23: Power service operator
24: Operator of payment service 25: Charger use customer
26: Electric car charger central server system
121: Power supply unit 122: Earth leakage breaker
123: power amount detection unit 124: relay
125: Charging power output unit 126: DC power supply unit
127: control unit 128: communication module
129: Control unit
221: Power supply unit 222: Earth leakage breaker
223: Direct current / AC leakage detection unit 224:
225: Relay 226: Charging power output section
227: DC power supply unit 228: Control unit
229: Communication module 230: Control unit
241: Payment approval data
261: central server 262: communication module
263: Manager terminal 264: Administrator Smart terminal
265: Administration database

Claims (7)

A charger for charging a battery of an electric vehicle,
A power supply unit connected to a power network for supplying various electric power including an intelligent power network;
A DC and AC leakage detector for detecting whether electric power supplied through the power supply unit is short-circuited;
An earth leakage breaker for shutting off the power transmitted from the power supply unit to the charging power supply output unit in accordance with the leakage current detected by the DC and AC leakage detection unit and the control unit;
A power amount detecting unit for detecting an amount of power input from the power supply unit;
A relay connected to the power amount detecting unit and opening / closing a supply power supplied to the charging power output unit;
A charging power supply output unit for supplying AC power input from the power supply unit;
A control unit for calculating a power measurement value of the power supply unit measured by the direct current and AC leakage detection unit and the power amount detection unit, determining whether or not there is a short circuit, and controlling the communication module and the earth leakage cutoff unit; And
And a communication module connected to the control unit,
The earth leakage breaker is composed of an A-type earth leakage breaker that blocks not only AC but also DC leakage.
The DC and AC leakage detector measures a current change value between the power supply unit and the charging power supply output unit and transmits the measured current change value to the control unit. The control unit detects a state change value of the DC or AC current of the power supply unit Calculates a leakage current state, determines a charger state,
And an automatic restoration circuit breaker automatic restoration device for an electric car charger that controls automatic restoration in accordance with a leakage current state during an OFF operation of the earth leakage breaker
The method according to claim 1,
The control unit sets the leakage current judgment reference value and calculates in real time the measured values of the DC and AC state changes of the power supply unit and the measured values of the power amount detection unit transmitted from the DC and AC leakage detection unit, An electric circuit breaker automatic recovery device of an electric car charger which determines the charger state as a standby state or a charged state by operating
The method of claim 1, wherein
Further comprising a central server system connected to the communication module to monitor charging and management status information of each local charger in real time,
The method of claim 3, wherein
The central server system connected to the communication module includes a central server, a communication module, an administrator terminal, and a management database,
The central server system transmits and receives charging and management status information with the communication module of each local charger in real time to monitor the status of each charger and to control the charging, The system includes a power supply service operator server, a billing service operator server, and an electrical circuit breaker automatic recovery device of an electric car charger connected to the charger user terminal,
A charger for charging a battery of an electric vehicle,
A power supply unit connected to a power network for supplying various electric power including an intelligent power network;
A DC / AC leakage detector for detecting whether AC power supplied through the power supply unit and DC power supplied to the electric vehicle are short-circuited;
An earth leakage breaker for shutting off the power transmitted from the power supply unit to the charging power supply output unit in accordance with the leakage current detected by the DC and AC leakage detection unit and the control unit;
A power amount detecting unit for detecting an amount of power input from the power supply unit;
A relay connected to the power amount detecting unit and opening / closing a supply power supplied to the charging power output unit;
A charging power supply output unit for supplying AC power input from the power supply unit;
A control unit for calculating a power measurement value of the power supply unit measured by the direct current and AC leakage detector and the power amount detection unit, determining whether or not there is a short circuit, and controlling the communication module and the electric leakage blocking unit;
A communication module connected to the control unit; And
And a central server system connected to the communication module to monitor charging and management status information of each area charger in real time,
The earth leakage breaker is composed of an A-type earth leakage breaker that blocks not only AC but also DC leakage.
The DC and AC leakage detector measures a current change value between the power supply unit and the charging power supply output unit and transmits the measured current change value to the control unit. The control unit detects a state change value of the DC or AC current of the power supply unit Calculates a leakage current state, determines a charger state,
The control unit stores a threshold value (a threshold value of a leakage amount or a voltage drop amount) for automatic restoration of the earth leakage breaker,
An automatic restoring circuit breaker of an electric charger of an electric car charger which automatically restores the electric leakage circuit breakers without an artificial restoration operation when the charger short circuit state is within the threshold value for automatic restoration of the electric leakage breaker when the OFF operation of the electric leakage circuit breaker occurs
The method of claim 5, wherein
The central server system connected to the communication module includes a central server, a communication module, an administrator terminal, and a management database,
The central server system transmits and receives charging and management status information with the communication module of each local charger in real time to monitor the status of each charger and to control the charging, A method for automatically recovering an electric leakage circuit breaker of an electric car charger that transmits management information bidirectionally and stores it in a management database, and manages the charger in connection with a power service operator server, a billing service operator server, and a charger user terminal
The method of claim 6, wherein
In case that the OFF operation of the earth leakage breaker occurs, the earth leakage breaker is automatically restored without an artificial recovery operation when the charger shortage state is within the threshold value for automatic recovery of the earth leakage breaker.

Images