KR102313121B1 - Metering Accuracy Measurement System for Electric Vehicle Chager - Google Patents

Abstract

The present invention relates to an electric vehicle charger metering error checking system, which is composed by comprising: an electric vehicle charger; an inlet capable of connecting a connector of a charging cable of the electric vehicle charger; an electric vehicle charger control unit for controlling an electric vehicle charger operation; a voltage/current measuring unit which measures a voltage/current input through the inlet during the electric vehicle charger operation; a pulse receiving unit capable of detecting a pulse signal from a test output device of the electric vehicle charger; a metering error checking unit which measures an amount of charge using the measured voltage/current and compares and calculates the amount of charge received by the pulse receiving unit in real time; a communication unit for transmitting measurement error check data to a user terminal; and a loader. An object of the present invention is to provide the electric vehicle charger metering error checking system capable of deriving a more precise and simple charge metering error.

Description

Electric Vehicle Charger Weighing Error Inspection System {Metering Accuracy Measurement System for Electric Vehicle Charger}

The present invention relates to a measurement error checking system for an electric vehicle charger, which measures the voltage/current from a connector link of an electric charger to measure the amount of charge in real time, and detects the metering output pulse output from the test output device of the electric vehicle charger to information about the amount of charge of the electric vehicle charger It relates to an inspection system that senses in real time and compares them to calculate a filling metering error.

Currently, electric vehicle chargers have been designated and managed as legal meters from 2020, and electric vehicle chargers installed on site have various failures and failures, so periodic safety inspections must be performed. It is common to conduct safety inspections only for measurements, etc.

Meanwhile, at the electric vehicle charger installation site, a watt-hour meter for charging the charging service provider is installed outside the electric vehicle charger, and a watt-hour meter for charging electric vehicle consumers is installed inside the electric vehicle charger.

Existing electric vehicle chargers were limited to the watt-hour meter installed outside, and if necessary, on-site inspection was possible by using the metering error checking equipment for the watt-hour meter. On the other hand, it is possible to check the watt-hour meter inside the electric vehicle charger using the existing metering error checking equipment for the electric watt-hour meter, but for this, the front or rear cover of the electric vehicle charger must be opened. There was a problem that inspection was not easy due to the diversification of types.

In addition, the existing electric vehicle charger metering error measurement method did not employ a method to check the metering error including cable loss at the charging connector end, so there was a disadvantage in that it was not possible to derive a precise charging metering error.

Therefore, in order to ensure the accuracy of the charging amount of the electric vehicle charger that provides the electric vehicle charging service and the fairness of charging, it is necessary to continuously verify the metering performance, and there is a continuous need for on-site inspection equipment that can accurately check the charging and metering error at the electric vehicle charger installation site. do.

The matters described as the background art above are only for improving understanding of the background of the present invention, and should not be taken as an acknowledgment that they correspond to the prior art already known to those of ordinary skill in the art.

The present invention has been devised to solve the problems of the prior art, and measures the voltage/current from the electric charger connector link to measure the amount of charge in real time, and detects the metering output pulse output from the test output device of the electric vehicle charger to control the electric vehicle charger. The purpose of this is to provide an electric vehicle charger metering error checking system that can derive a more precise and simple charge metering error by sensing the amount of charge information in real time and comparing it with each other to calculate the charge metering error.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art from the description of the present invention. .

The present invention devised to solve the problems of the prior art described above includes a metering error checking device connected to an electric vehicle charger, and a load connected to the metering error checking device, wherein the metering error checking device includes the electric vehicle Voltage and current measuring unit for measuring the voltage and current input from the charger; a pulse sensing unit for sensing a pulse transmitted from the test output device of the electric vehicle charger; an electric vehicle charger control unit for controlling the charging operation of the electric vehicle charger; a metering error checking unit receiving measurement results from the voltage and current measuring unit and the pulse receiving unit and measuring a charging metering error; a display unit for receiving and displaying the measurement result of the charging metering error of the metering error checking unit; It provides an electric vehicle charger metering error checking system comprising a.

In the present invention, it is preferable that the metering error check unit calculates the charge metering error by calculating the amount of charge based on the voltage and current amount measured by the voltage and current measuring unit, and comparing the charge amount calculated by the pulse sensed by the pulse sensing unit in real time.

In the present invention, the metering error checking unit inputs the difference between the energy accumulation amount before connecting the metering error checking equipment to the load and the energy accumulation amount after connecting the metering error checking equipment to the load into the metering and checking equipment equipment and stored in advance. It is preferable to measure the error by comparing it to a standard energy accumulation.

In the present invention, the metering error checking unit receives the amount of energy (Pm∑) measured by the electric vehicle charger and compares it with the amount of energy (Ps∑) measured in the metering error checking equipment, but in the following equation It is preferable to measure the filling metering error by

Error(%) = ((Pm∑ - Ps∑) / Ps∑) * 100

In the present invention, the metering error checking equipment includes: a communication unit for transmitting the calculation result of the metering error checking unit to a user terminal; and a temperature sensor for measuring the temperature therein.

In the present invention, the electric vehicle charger control unit comprises: an AC-DC converter for converting AC power input from the electric vehicle charger into DC power; a CP control circuit for checking a CP (Control Pilot) signal input from the electric vehicle charger; a PD detection circuit for checking a PD (Proximity Detection) signal input from the electric vehicle charger; a microcontroller for controlling the AC-DC converter, the CP control circuit and the PP control circuit; and a solid state relay (Solid 　State 　Relay).

In the present invention, the electric vehicle charger control unit checks the rated current (Ampere) of the electric vehicle charger, determines whether the charging cable connector of the electric vehicle charger is in contact, checks the operation of the electric vehicle charger CP (Control Pilot) level, and performs a power cut-off function when the electric vehicle charger connector connection is stopped It is preferable to do

In the present invention, it is preferable that the display unit displays detailed items for each electric vehicle charger information, weighing error check setting, weighing error check test, weighing error check history list, and weighing error check history on a screen, respectively.

In the present invention, the electric vehicle charger includes a test output device that generates a pulse in proportion to the amount of power supplied to the metering error checking device, and sends a pulse to the metering error checking device in real time through an infrared LED output unit of the test output device. It is preferable to supply

In the present invention, the load device is connected to the metering error checking device through a connection connector, and a load resistance through which the voltage and current input from the electric vehicle charger are transmitted through the metering error checking device, and a PLC that controls the load resistance (Programmable Logic Circuit) is preferably provided.

According to the present invention, the amount of charge is measured in real time by measuring the voltage/current from the connector link of the electric charger, and the amount of charge information of the electric vehicle charger is sensed in real time by sensing the metering output pulse output from the test output device of the electric vehicle charger, and it is compared and charged. By calculating the weighing error, it is possible to derive a more precise and simple filling weighing error.

Effects of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a schematic diagram of an electric vehicle charger metering error checking system according to an embodiment of the present invention.
Figure 2 is a configuration diagram of a measurement error checking equipment according to an embodiment of the present invention.
3 is a block diagram of a load according to an embodiment of the present invention;
4 is a configuration diagram of an electric vehicle charger metering error checking system according to an embodiment of the present invention.
5 is a flowchart illustrating an inspection method of an electric vehicle charger metering error inspection system according to an embodiment of the present invention.
6 is a sub-configuration of a measurement error checking unit according to an embodiment of the present invention.
7 is a detailed configuration diagram showing an electric vehicle charging control unit according to an embodiment of the present invention.
8 is a detailed configuration diagram showing a load device according to an embodiment of the present invention.
9 is a graph for calculating a rated current of an electric vehicle charger according to an embodiment of the present invention.
10 is an exemplary view showing a state in which the internal resistance value is changed according to the connector switch when the electric vehicle charging inlet according to the embodiment of the present invention is coupled to the metering error checking equipment.
11 is an exemplary view showing each functional item of the display unit according to an embodiment of the present invention.
12 is an exemplary view showing each operation step of the display unit according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all the technical spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

In order to check the charging amount error (measurement error) of the electric vehicle charger, the electric vehicle charger 400 must be operated.

Currently, electric vehicle chargers are divided into slow (AC) chargers and fast (DC) chargers according to the charging method, and both AC and DC metering technologies must be included. Two types of slow and three types of fast charging connectors are mixed and used, and each charging connector has a different shape and a different charging protocol.

Therefore, the electric vehicle charger metering error checking system of the present invention provides a charging protocol by applying the slow (AC)/rapid (DC) metering error check function and each charging connector, so that the weighing check of the pre-installed electric vehicle charger with one inspection device is simple. developed for ease of use.

1 is a schematic diagram of an electric vehicle charger metering error checking system according to an embodiment of the present invention, and FIG. 4 is a configuration diagram of an electric vehicle charger metering error checking system according to an embodiment of the present invention.

The present invention is configured to include a metering error checking equipment 100 connected to the electric vehicle charger 400 and a load 300 connected to the metering error checking equipment.

In the present invention, when a problem such as a charging amount or a measurement value abnormality occurs at the site where the electric vehicle charger 400 is installed, it can be configured to be able to check quickly at the site. That is, the metering error checking device 100 may be formed in a portable type, and includes various sensor units such as a voltage and current measuring unit 110 and a pulse sensing unit 120, and the measurement measured through the voltage and current sensor It performs the function of indicating the charge metering error through real-time comparison of the value and the real-time charge meter value of the charger through the pulse sensor.

The electric vehicle charger 400 and the weighing error checking equipment 100 are connected through the electric vehicle charger connection inlet 114, and the weighing error checking equipment 100 and the loader 300 also use a cable to check the weighing error. It is connected through the connecting connector 350 .

On the other hand, the electric vehicle charger metering error checking system of the present invention is configured to consume the charging power according to the charging operation of the electric vehicle charger 400 by using the load 300 that performs the function of replacing the electric vehicle battery, According to the needs of the invention, the metering error checking system can be driven even if the charging power according to the charging of the electric vehicle charger is directly connected to the electric vehicle, and the charging metering error can also be calculated.

2 is a configuration diagram of a metering error checking equipment according to an embodiment of the present invention.

The metering error checking device 100 includes a voltage and current measuring unit 110 that measures voltage and current input from the electric vehicle charger, and a pulse sensing unit that senses a pulse transmitted from a test output device of the electric vehicle charger. The unit 120, the electric vehicle charger control unit 170 for controlling the charging operation of the electric vehicle charger, and the metering error checking unit 160 for receiving the measurement results from the voltage and current measuring unit and the pulse receiving unit and measuring the charging metering error and a display unit 130 for receiving and displaying the measurement result of the filling measurement error of the metering error checking unit.

As described above, the metering error checking device 100 receives a pulse output from the test output device of the electric vehicle charger 400 to be checked through the pulse sensing unit 120, senses the real-time charging amount information, and the electric vehicle charger ( 400) and the voltage and current provided through the same voltage line as the voltage and current through the voltage and current measurement unit 110 in real time, and the above voltage/current value and the pulse sensing unit 120 It is possible to perform a function of calculating a weighing error through real-time comparison of the real-time filling metering value.

Referring to FIG. 2 , an AC power input connector 191 for supplying power to the weighing error checking equipment 100 , an electric vehicle charger connection inlet 114 , a load connection connector 192 , a pulse sensing unit 120 , and a USB It can be seen that the connector 193, the Ethernet connection connector 194, and the display unit 130 are provided.

6 is a sub-configuration of a measurement error checking unit according to an embodiment of the present invention.

The metering error checking unit 160 provided in the metering error checking device 100 calculates the amount of charge based on the voltage and current amount measured by the voltage and current measurement unit 110, and the pulse sensing unit 120 senses It performs the function of calculating the filling metering error by comparing the filling amount calculated by the pulse in real time.

To this end, the electric vehicle charger 400 includes a test output device (not shown) that generates a pulse in proportion to the amount of power supplied to the metering error checking device 100, and an infrared LED output unit ( (not shown), the pulse is supplied to the metering error checking equipment 100 in real time.

The electric vehicle charger 400 has an instrument constant, and the instrument constant is expressed as imp/kwh, and a pulse may be generated according to the real-time measurement value according to the instrument constant. For example, if the instrument constant is 1,000 imp/kwh, 1 pulse is output through the infrared LED output when measuring 1w, and when the instrument constant is 50,000 imp/kwh, 1 pulse is output through the infrared LED output every time 0.02w is measured. will be able to output

The above pulse measurement method detects a pulse output from the electric vehicle charger 400 through the pulse sensing unit 120, and the amount of energy calculated by the metering error check unit 160 through the detected pulse and the actual electric vehicle charger 400 It will be possible to measure the metering error by comparing the amount of power input from the power supply in real time.

In addition, the weighing error checking unit 160 includes the amount of energy accumulated before connecting the metering error checking device 100 to the loader 300 and the amount of energy accumulated after connecting the metering error checking device 100 to the load. It is also possible to measure the error by inputting the difference of , into the weighing and checking equipment and comparing it with the pre-stored standard energy accumulation. In this case, the pre-stored standard energy accumulation amount may use a known standard energy accumulation amount as the energy supply amount per unit time.

On the other hand, the metering error checking unit 160 receives the amount of energy (Pm∑) measured by the electric vehicle charger 400, and the amount of energy (Ps∑) measured in the metering error checking device 100 with this input. , but the filling metering error can be measured by Equation 1 below.

[Equation 1]

Error(%) = ((Pm∑ - Ps∑) / Ps∑) * 100

This accumulated amount comparison method can be applied to a model that displays the accumulated amount in the electric vehicle charger (), and the difference between the accumulated amount before connecting the load and the accumulated amount after connecting the load for a certain period of time is input to the weighing and inspection equipment 100 and stored in advance. It may be possible to measure the error compared to the standard energy accumulation.

Referring to FIG. 6 , the metering error checking device 100 further includes a communication unit 210 for transmitting the calculation result of the metering error checking unit to a user terminal and a temperature sensor 220 for measuring the temperature therein. can be configured.

That is, the metering error checking device 100 includes a safety check function such as insulation resistance measurement, leakage current generation, and pin temperature monitoring in the charging coupler required for safety check according to the needs of the invention in addition to the charging metering error calculation function. can do.

In addition, the inspection history such as charging measurement error through the metering error checking device 100 can be stored in the memory 115 in the metering error checking device, and the service provider requests the server or the user terminal to check the charging metering error, etc. The communication unit 210 that can transmit the history through Ethernet communication or the like may also be installed in the measurement error checking equipment.

On the other hand, the metering error checking device 100 includes a voltage detection circuit 112 for measuring the voltages of L and N at which the voltage line of the electric vehicle charger is bitten during the charger metering error check operation to measure the voltage and current for the metering error check, and the current A detection circuit 111 and a current amplification circuit 113 for amplifying current and inputting the current to the measurement IC 162 may be provided.

In addition, in order to protect the MCU 161 and the measurement IC 162 of the weighing error checking unit 160 from external EMC noise that may be introduced from the power supply, the power supply unit 163 and the low power consumption type linear regulator 164 are configured. A surge protection circuit can be adopted.

In summary, the measurement error checking unit 160 may be composed of the MCU 161 and the measurement IC 162 , and receives data from the pulse sensing unit 120 and the voltage and current measurement unit 110 to calculate the measurement error. However, it can communicate with the communication unit 210 , the memory 115 and the temperature sensor 220 .

5 is a flowchart illustrating a method of checking an electric vehicle charger metering error checking system according to an embodiment of the present invention, and FIG. 7 is a detailed configuration diagram showing an electric vehicle charging control unit according to an embodiment of the present invention.

The electric vehicle charger control unit 170 provided in the metering error checking equipment 100 includes an AC-DC converter 230 that converts AC power input from the electric vehicle charger 400 into DC power, and the electric vehicle charger 400 . A CP control circuit 240 for checking an input CP (Control Pilot) signal, a PD detection circuit 250 for checking a PD (Proximity Detection) signal input from the electric vehicle charger 400, and the AC-DC converter; It may be configured to include a microcontroller 140 and a solid state relay 180 for controlling the CP control circuit and the PP control circuit.

The electric vehicle charger control unit 170 checks the rated current (Ampere) of the electric vehicle charger, determines whether the charging cable connector of the electric vehicle charger is in contact, checks the operation of the electric vehicle charger CP (Control Pilot) level, and performs a power cutoff function when the electric vehicle charger connector connection is stopped can do.

In the present invention, the AC-DC converter 230 performs a function of a surge protection circuit.

The CP (Control Pilot) control circuit 240 performs a function of controlling the CP PWM signal, and a CP (Control Pilot) signal line and a PD (Proximity Detection) signal line are provided in the charging inlet 114 of the electric vehicle charging connector. , the CP signal line controls the charging operation between the electric vehicle charger 400 and the measurement error checking equipment 100 through PWM (pulse width modulation).

Therefore, the charging operation between the electric vehicle charger 400 and the metering error checking equipment 100 is mutually operated with a CP signal, and it is necessary to implement a charging sequence mode according to the standard. In the charging state, the charging current is the CP control circuit 240 The operation is controlled by the CP signal to control the charging state by adjusting the voltage output, and the PWM duty cycle of the CP signal is adjusted to control the charging current.

On the other hand, it performs a function of checking whether the PD (Proximity Detection) detection circuit 250 connector and the electric vehicle charger connection inlet 114 are properly fastened.

As described above, the electric vehicle charger connection inlet 114 has a CP (Control Pilot) signal line and a PD (Proximity Detection) signal line. can do.

That is, looking at the fastening operation confirmation process, there is a push switch for latching action on the connector side, and when it is fastened with the inlet, the latch is caught by the inlet and does not come off. As the resistance value in the detection circuit 250 changes, the voltage value at both ends of the resistor changes. The inlet side checks the voltage value through the PD signal line to confirm whether the connector-inlet is properly fastened. A check method for this is partially illustrated in FIG. 5 .

As described above, in the present invention, the CP signal (PWM signal) is exchanged between the electric vehicle charger 400 and the metering error checking equipment 100, and the charging state information and the Max charging current information are checked and charged.

In addition, the slow (AC) electric vehicle charger controls the operation with the CP signal, but the fast (DC) electric vehicle charger may operate through the control protocol in the PLC or CAN communication method according to the charging connector.

3 is a configuration diagram of a loader according to an embodiment of the present invention, and FIG. 8 is a detailed configuration diagram showing a loader according to an embodiment of the present invention.

The load 300 is connected to the metering error checking device 100 through a connection connector, and the voltage and current input from the electric vehicle charger 400 are transmitted through the metering error checking device 100 through the load resistance It may include a 310 and a programmable logic circuit (PLC) 320 for controlling the load resistance.

In the present invention, the load resistor 310 can be designed in consideration of the rated current (Imax) output of the slow electric vehicle charger, and it can be designed so that the output is possible in the range of the current electric vehicle charger rated current (Imax, 32A to 70A). It can be applied to output the maximum allowable error point for each charging current based on the rated current.

In the present invention, the load 300 can be applied to the 20kW class, and its size and weight are difficult to move easily, so it can be formed to be mounted on a vehicle for inspection and moved. Considering this, the loader FAN 380 location and quantity can be determined. In addition, a separate temperature sensor 390 may be provided to detect the heat state of the load 300 distribution.

Meanwhile, the voltage and current supplied from the electric vehicle charger 400 are displayed through the voltage meter 330 and the current meter 340 , and the PLC 320 controls the load by receiving these values as feedback. For each sequence of the test, the state sent from the MCU 161 of the weighing error checking equipment may be displayed with the status LED 360 .

9 is a graph for calculating a rated current of an electric vehicle charger according to an embodiment of the present invention.

The electric vehicle charger control unit 170 receives the CP PWM of the electric vehicle charger 400, determines the charging state, and changes the resistance controlling each state at each stage through relay control, and receives feedback You can check the charging status.

As described above, the electric vehicle charger control unit 170 of the present invention may perform a function of confirming the electric vehicle charger rated current Ampere.

Referring to FIG. 9A , in the present invention, the formula for calculating the current input from the electric vehicle charger is the same as Equation 2 below.

[Equation 2]

……………………①

… … … … … … … … ①

………………②

… … … … … … ②

Duty Cycle

85% 인 경우 공식 ①을, 10% < Duty Cycle

96% 인 경우 공식 ②를 따르며, 이때 Duty Cycle은 도 9의 (b)에서 명시된 카운트(Count)를 이용해 하기의 수학식 3과 같이 나타낼 수 있다.10% here

Duty Cycle

For 85%, use formula ①, 10% < Duty Cycle

In the case of 96%, formula ② is followed, and in this case, the duty cycle can be expressed as in Equation 3 below using the count specified in (b) of FIG. 9 .

[Equation 3]

……③

… … ③

At this time, the formula for calculating the allowable current of the charger can be derived as in Equation 4 below by substituting Equation 3 into ① or ② of Equation 2 according to the duty cycle.

[Equation 4]

………………④

… … … … … … ④

………⑤

… … … ⑤

10 is an exemplary view illustrating a state in which an internal resistance value is changed according to a connector switch when an electric vehicle charging inlet according to an embodiment of the present invention is coupled to a measurement error checking device.

As described above, the electric vehicle charger control unit 170 may perform a power cut-off function when determining whether the electric vehicle charger is in contact with the charging cable connector, checking the operation of the electric vehicle charger CP (Control Pilot) level, and stopping the electric vehicle charger connector connection.

First, the function of determining whether the connector of the charging cable is in contact with the charging connector of the electric vehicle charger 400 and the electric vehicle charger connection inlet 114 of the metering error checking equipment 100 is checked to confirm the chargeable state and then charged This is a function that allows you to move on to the test sequence.

Referring to FIG. 10 , the internal resistance value of the connector of the electric vehicle charger is changed according to the connector switch when the electric vehicle charger connection inlet 114 is coupled. Real-time monitoring is performed to determine the connector mating state, and in case of a connector mating defect before proceeding with all tests, an inspection error is notified and the test sequence is stopped.

Second, in the electric vehicle charger CP (Control Pilot) level operation check function, the electric vehicle charger control unit 170 monitors the CP PWM signal from the electric vehicle charger in real time and performs a charging test with the CP level operation signal according to the charging sequence. At this time, if the CP level operation signal for each sequence step is different, an error is notified and the test sequence is stopped.

Third, as a power cut-off function when the connection of the electric vehicle charger connector is stopped, the electric vehicle charger must cut off power when the user arbitrarily unplugs the connector during the electric vehicle charging operation or becomes unplugged for other reasons, the electric vehicle charger control unit 170 arbitrarily reproduces the connector unplug state, so that it is possible to check whether the power cut-off function of the electric vehicle charger operates.

11 is an exemplary diagram illustrating each functional item of the display unit according to an embodiment of the present invention, and FIG. 12 is an exemplary diagram illustrating each operation step of the display unit according to an embodiment of the present invention.

In the present invention, the display unit 130 may display electric vehicle charger information, weighing error check settings, weighing error check test, weighing error check history list, and detailed items for each weighing error check history on the screen, respectively.

Each operation step of the display unit 130 will be described with reference to FIG. 12 .

1. On the driving screen, initial self-diagnosis can be performed, and the connection and communication status between the weighing error checking equipment 100 and the load 300 can be checked.

2. On the main screen, various function selection buttons such as weighing error check and inspection history management may be displayed, and the display of the display unit 130 may be terminated through the power button.

3-1. The charger information input screen pop-up a setting window when selecting a weighing error check item, input electric vehicle charger information, and select a weighing error measurement method.

3-2. The weighing error check test setting screen allows you to select a test type such as weighing error and set the test time.

3-3. The weighing error check test screen allows you to check the weighing error measurement progress screen, weighing error test data, and instantaneous data on the load side.

4-1. On the inspection history screen, a list of data saved in the previously performed weighing error test is displayed, and 4-2. The detailed inspection history data screen displays a screen for checking detailed items in the stored weighing error data list.

Table 1 above is a test result table of testing the power measurement error accuracy (AC) as a prototype of the electric vehicle charger metering error checking system of the present invention.

The above test is based on the test items specified in the electric vehicle charger technical standards (Ministry of Trade, Industry and Energy Notice No. 2019-109, 2019.07.04) Accuracy of AC metering error was confirmed by measuring and inspecting equipment for slow (AC) electric vehicle chargers.

As detailed conditions of the above test, standard equipment with a power measurement accuracy of 0.02% or higher was applied, and the test was conducted by supplying the voltage 220V and current (charging current) of the above evaluation criteria as a common source (voltage, current), and Standard equipment and development equipment (AC metering and inspection equipment) each measure electric power, and standard equipment compares its own metered electric power with the developed equipment’s metered electric power (real-time output of electric energy as a pulse) to determine the power measurement precision of the development equipment as an error rate. judged.

In addition, in the above test, the watt-hour meter provided the meter constant (indicating the amount of energy as the number of pulses, Pulse/kWh) as the rating, and output it as an external pulse. did.

And, the point of the above test was calculated based on the rated current of 32A of the slow-speed electric vehicle charger currently being distributed and the rated current of 70A, which is scheduled to be upgraded thereafter, in accordance with the technical standard for electric vehicle charger presented as an evaluation method. That is, based on 'Rated current (Imax 32A) - Reference current (In 30A) - Minimum current (Imin 4A)' and 'Rated current (Imax 70A) - Reference current (In 30A) - Minimum current (Imin 4A)' Test points were calculated.

As described above, the present invention replaces the role of the electric vehicle and communicates with the electric vehicle charger, controls the electric vehicle charger to perform the charging operation, and when the electric vehicle charger performs the charging operation, the voltage/current is measured from the voltage line of the electric vehicle charger connector to measure the amount of charge Real-time measurement of the electric vehicle charger and sensing the metering output pulse output from the test output device of the electric vehicle charger to sense the charge amount information of the electric vehicle charger in real time. Since the measurement error is measured by comparison, it has the advantage of being able to derive a more precise and simple filling weighing error.

The present invention has been described above in relation to specific embodiments of the present invention, but this is merely an example and the present invention is not limited thereto. Those of ordinary skill in the art to which the present invention pertains can change or modify the described embodiments without departing from the scope of the present invention, within the technical spirit of the present invention and equivalent scope of the claims to be described below Various modifications and variations are possible.

100: measurement error checking equipment 110: voltage and current measuring unit
111 current detection circuit 112 voltage detection circuit
113: current amplification circuit 114: electric vehicle charger connection inlet
115: memory 120: pulse sensing unit
130: display unit 140: microcontroller
150: main controller 160: weighing error checking unit
161: MCU 162: measurement IC
163: power supply 164: low power consumption type linear regulator
170: electric vehicle charger control unit 180: solid state relay
191: AC power input connector 192: load connection connector
193: USB connector 194: Ethernet connection connector
210: communication unit 220: temperature sensor
230: AC-DC converter 240: CP control circuit
250: PD detection circuit 300: load
310: load resistance 320: PLC
330: voltage meter 340: current meter
350: Weighing error check equipment connection connector 360: Status LED indicator
370: circuit breaker for wiring 380: FAN
390: load temperature sensor 400: electric vehicle charger

Claims (10)

A metering error checking device connected to an electric vehicle charger, and a load device connected to the metering error checking device,
The metering error checking equipment,
a voltage and current measuring unit for measuring the voltage and current input from the electric vehicle charger;
a pulse sensing unit for sensing a pulse transmitted from the test output device of the electric vehicle charger;
an electric vehicle charger control unit for controlling the charging operation of the electric vehicle charger;
a metering error checking unit receiving measurement results from the voltage and current measuring unit and the pulse receiving unit and measuring a charging metering error;
a display unit for receiving and displaying the measurement result of the charging metering error of the metering error checking unit; including,
The electric vehicle charger control unit,
Electric vehicle charger metering error, characterized in that it checks the rated current (Ampere) of the electric vehicle charger, determines whether the charging cable connector of the electric vehicle charger is in contact, checks the operation of the electric vehicle charger CP (Control Pilot) level, and shuts off the power when the electric vehicle charger connector is disconnected check system.
According to claim 1, wherein the measurement error checking unit,
An electric vehicle charger metering error checking system, characterized in that the charging amount is calculated by the voltage and current amount measured by the voltage and current measuring unit, and the charging metering error is calculated by comparing the charging amount calculated by the pulse sensed by the pulse sensing unit in real time.
delete According to claim 1, wherein the measurement error checking unit,
The amount of energy (Pm∑) measured by the electric vehicle charger is input, and the amount of energy (Ps∑) measured in the metering error checking equipment is compared with the amount of energy (Ps∑) measured, and the charging metering error is measured by the following equation Electric vehicle charger metering error checking system.

Error(%) = ((Pm∑ - Ps∑) / Ps∑) * 100
According to claim 1, wherein the measurement error checking equipment,
a communication unit for transmitting the calculation result of the weighing error checking unit to a user terminal; and
a temperature sensor for measuring the temperature therein;
Electric vehicle charger metering error checking system comprising a.
According to claim 1, wherein the electric vehicle charger control unit,
an AC-DC converter converting AC power input from the electric vehicle charger into DC power;
a CP control circuit for checking a CP (Control Pilot) signal input from the electric vehicle charger;
a PD detection circuit for checking a PD (Proximity Detection) signal input from the electric vehicle charger;
a microcontroller for controlling the AC-DC converter, the CP control circuit and the PP control circuit; and
Solid State Relay;
Electric vehicle charger metering error checking system, characterized in that it comprises a.
delete According to claim 1, wherein the display unit,
Electric vehicle charger weighing error inspection system, characterized in that each detailed item for each electric vehicle charger information, weighing error check setting, weighing error check test, weighing error check history list, and weighing error check history is displayed on the screen.
According to claim 1, wherein the electric vehicle charger,
A test output device for generating a pulse in proportion to the amount of power supplied to the metering error checking device, and supplying the pulse to the metering error checking device in real time through the infrared LED output unit of the test output device Weighing error checking system.
According to claim 1, wherein the load group,
It is connected to the weighing error checking device through a connection connector,
a load resistance through which the voltage and current input from the electric vehicle charger are transmitted through a metering error checking device;
Electric vehicle charger metering error checking system, characterized in that it comprises a PLC (Programmable Logic Circuit) for controlling the load resistance.

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