KR-20260067189-A - REMOTE INSPECTION CONTROL DEVICE FOR ELECTRIC VEHICLE CHARGER

Abstract

The present invention relates to a remote inspection control device for an electric vehicle charger implemented to remotely detect electrical abnormal signs (current, voltage, power factor, arc, temperature) and charger defects in a commercial power environment, analyze them, and cut off the power supply when abnormal signs occur. According to the remote inspection control device for an electric vehicle charger of the present invention, by analyzing abnormal signs of a currently installed electric vehicle charger and providing real-time notification to the manager, problems with the electric vehicle charger can be quickly identified and corrective measures can be taken. This reduces revenue losses caused by the inability to use the charger and ensures maximum safety for users by allowing them to prepare for unexpected accidents when using the charger.

Inventors

• 박창일
• 김조헌
• 이재헌

Assignees

• (주)아이앤씨테크놀로지

Dates

Publication Date

20260512

Application Date

20241105

Claims (6)

1. In a control device for an electric vehicle charger, An analog front-end circuit that detects and outputs information regarding the current, voltage, overcurrent, and leakage current of electricity flowing on each circuit of the RSTN from the commercial power line using a current transformer (CT) and a zero-sequence current transformer (ZCT); A control unit that determines whether there is an abnormality in the electric vehicle charger using safety data and arc data output from the analog front-end circuit; and A remote inspection control device for an electric vehicle charger characterized by including a communication unit that transmits data indicating whether the electric vehicle charger is abnormal to a management server.
2. In claim 1, the analog front-end circuit is A sensing unit that detects and outputs information regarding the current, voltage, overcurrent, and leakage current of electricity flowing on each circuit of the RSTN from the commercial power line using a current transformer (CT) and a zero-sequence current transformer (ZCT); A temperature sensing unit that detects and outputs temperature using a temperature sensor; and A remote inspection control device for an electric vehicle charger characterized by including an arc detection unit that detects and outputs an arc using a three-phase arc coupling circuit.
3. In Clause 2, the arc detection unit An amplifier that amplifies the arc signal output from the above-mentioned three-phase arc coupling circuit; A filter unit that removes noise from the arc signal output from the amplification unit and extracts only the prominent arc signal; An analog-to-digital converter that converts an analog arc signal output from the filter unit into a digital signal; and A remote inspection control device for an electric vehicle charger characterized by including a digital signal processing unit that analyzes and decomposes the frequency of an arc signal output from the analog-to-digital converter above.
4. In claim 1, the three-phase arc coupling circuit A high-frequency pass filter section composed of first, second, and third capacitors connected to the above-mentioned three-phase commercial power line; A high-frequency coupling unit comprising a transformer having three input taps of a primary coil connected to the first, second, and third capacitors, and fourth and fifth capacitors connected to both taps of the secondary coil of the transformer; and A remote inspection control device for an electric vehicle charger, characterized by comprising: a DC offset setting unit having first and second resistors connected in series between the fourth and fifth capacitors, and a third resistor connected between the connection node of the first and second resistors and the power supply voltage.
5. In claim 1, the data indicating whether the electric vehicle charger is abnormal A remote inspection control device for an electric vehicle charger characterized by having data regarding voltage, current, leakage current, overcurrent, arc, temperature, power factor, IGR, and IGO flowing through the electric vehicle charger.
6. In claim 1, the communication unit A remote inspection control device for an electric vehicle charger characterized by communicating with a management server using UART (Universal Asynchronous Receiver Transmitter), low-power wireless communication (Bluetooth Low Energy: BLE), LTE, Ethernet, RS-485, and Modbus communication.

Description

Remote Inspection Control Device for Electric Vehicle Charger The present invention relates to a remote inspection control device for an electric vehicle charger, and more specifically, to a remote inspection control device for an electric vehicle charger implemented to remotely detect defects such as leakage current, overcurrent, and arc, which are major causes of electrical fires in a commercial power environment, analyze them, and cut off the power supply when abnormal signs occur. Many countries are implementing policies to expand the supply of electric vehicles (EVs) to reduce greenhouse gas emissions and improve energy efficiency, and the Korean government is also providing various forms of support to promote the adoption and spread of EVs, including expanding public charging infrastructure, providing subsidies for EV purchases and charger installations, and offering temporary exemptions from basic charges and 50% discounts on electricity for EV charging. Consequently, the installation of electric vehicle chargers has been expanding every year since 2018. However, relying on a single circuit breaker as a means to prevent risks from electric vehicle chargers, and according to data from the Fire Department, the frequency of fires involving electric vehicle chargers installed in 2018 is gradually increasing, with 1 incident in 2019, 3 in 2020, 4 in 2021, 9 in 2022, and 13 in 2023. Furthermore, there are many cases where it is impossible to accurately determine whether such fires are caused by a problem with the electric vehicle charger or the vehicle itself. In such instances, if the problem is with the vehicle itself, it can be verified internally through the BMS (Battery Management System); however, if the fire is caused by a problem with the charger, it is impossible to confirm. Currently, the only safety measure for electric vehicle chargers is a shut-off device, and to supplement this, the installation of a remote control device capable of analyzing the complex status of the charger is required. FIG. 1 is a configuration diagram for explaining a remote inspection control device for an electric vehicle charger according to the prior art. Conventional electric vehicles (EV, 11) could be fast-charged or slow-charged using an electric vehicle charger (12) in an AC power environment, and the amount of electricity charged was determined through a meter (13) and billing was carried out. As illustrated in FIG. 1, the remote inspection control device (100) of an electric vehicle charger according to the prior art detects and analyzes voltage, current, leakage current, overcurrent, etc., which cause electrical fires when an electric vehicle (EV, 11) is charged using the electric vehicle charger (12) in a single-phase or three-phase power environment, communicates with a management server (14), and remotely inspects the status of the electric vehicle charger and remotely controls electrical safety so that the power can be cut off when abnormal signs occur. However, the remote control devices developed and distributed so far are equipment installed in smart distribution panels rather than for electric vehicle chargers, and are only capable of monitoring voltage, current, leakage current, and overcurrent; monitoring arc, temperature, power factor, IGR, and IGO is practically impossible. In addition, current remote control devices are applied to electric vehicle chargers using 2-pole single-phase power, and there is a problem in that they are difficult to apply to electric vehicle chargers using three-phase power. FIG. 1 is a configuration diagram for explaining a remote inspection control device for an electric vehicle charger according to the prior art. FIG. 2 is a diagram showing the configuration of a remote inspection control device for an electric vehicle charger according to the present invention. FIG. 3 is a diagram showing the configuration of an analog front-end circuit of a remote inspection control device of an electric vehicle charger according to the present invention. Figure 4 is a detailed circuit diagram of the analog front-end circuit shown in Figure 3. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. FIG. 2 is a diagram showing the configuration of a remote inspection control device for an electric vehicle charger according to the present invention. Referring to FIG. 2, the remote inspection control device (200) of an electric vehicle charger according to the present invention comprises an analog front-end circuit (210), a control unit (220), and a communication unit (230). The remote inspection control device (200) of the electric vehicle charger according to the present invention is a control device that analyzes and predicts signs of electrical abnormality in the electric vehicle charger (22). It monitors the current status of electricity usage in real time in industrial facilities or equipment that receive not o