KR101101270B1 - System for measuring insulation resistance of green car and method therefor - Google Patents

Abstract

PURPOSE: A system and a method for measuring the insulation resistance of environment-friendly vehicle are provided to easily determine vehicle safety standards and protect an inspector from an electric shock by blocking an applied voltage. CONSTITUTION: An amplified AC voltage is generated to an applied voltage. A voltage and current measurement part(200) applies the applied voltage to an insulation body and converts the value of the applied voltage and the value of a leakage current into a digital signal. A electric shock prevention part(300) generates an alarm sound if the short current value of a generated applied voltage is over a fixed level. An insulation resistance calculating part(400) calculates the insulation resistance value of an insulator using the value of a converted applied voltage and the value of the leakage current and.

Description

Insulation resistance measuring system and method of eco-friendly vehicle {SYSTEM FOR MEASURING INSULATION RESISTANCE OF GREEN CAR AND METHOD THEREFOR}

The present invention relates to a system and method for measuring insulation resistance of an environmentally friendly vehicle, and more particularly, in measuring insulation resistance of an environmentally friendly vehicle for determining compliance with automobile safety standards, sufficient applied voltage required for accurate measurement of insulation resistance and By providing a measurement resolution, the present invention relates to an insulation resistance measurement system and method optimized for insulation resistance measurement of environmentally friendly vehicles.

As environmental pollution becomes a global problem, there is a growing demand for strengthening regulations and developing renewable energy and environmentally friendly technologies to reduce the causes of environmental pollution. In line with this global trend, Korea has presented a low carbon green growth strategy as a vision for national development, and is pursuing a new growth engine policy to research eco-friendly cars to reduce automobile emissions.

A green car is a futuristic car that reduces CO2 emissions, which are the main cause of air pollution, and increases fuel efficiency according to the unit's mileage. It is divided into HEV, Plug-in Hybrid Electric Vehicle (PHEV), and Fuel Cell Vehicle (FCV).

International standards ISO 6469-3, ISO 23273-3, FMVSS305, UNECE R100, Japanese Attachment 101, and ELSA are related to eco-friendly cars to prevent electric shock accidents caused by direct and indirect contact with human bodies, to prevent short circuits due to insulation deterioration, and ground faults. In order to prevent electric fires caused by fire, the regulations on structural standards, insulation resistance, electrical continuity, and withstand voltage of high power electric devices are mentioned.In Korea, the regulations on automobile safety standards of the Ministry of Land, Transport and Maritime Affairs It provides structural safety standards for high-power electrical devices for electric shock protection.

Regarding Article 91 (4) of the Rules on Automobile Safety Standards, Annex 11-3 specifies the crash test criteria for high-power electric equipment as shown in [Table 1] below.

[Table 1]

According to the crash test criteria of the high power electric device, the insulation resistance between the high power live conductor part and the exposed conductive part should be 100 kV / V [DC] and 200 mA / V [AC], respectively. For example, in the case of a hydrogen fuel cell vehicle in which a voltage of about 440 V is output from a fuel cell stack, an insulation resistance value of about 44 kΩ or more must be maintained.

Therefore, the insulation resistance meter for measuring the insulation resistance value of the eco-friendly vehicle requires a test short circuit current of 10 mA or more in order to measure the insulation resistance value for determining compliance with the rules relating to the automobile safety standards.

However, the general electrical equipment should comply with the insulation resistance value according to the classification of the voltage used in the converter according to Article 52 of the Electrical Equipment Technical Standards announced by the Ministry of Knowledge Economy.

TABLE 2

In addition, the existing insulation resistance meter has a test short circuit current of 1 mA up to 5 mA depending on the earth voltage of the electrical equipment in order to measure the insulation resistance value of the general electrical equipment complying with the insulation resistance value according to the division of the voltage of the converter. It is configured to output, and it is generally configured to have a measurement resolution of 10kΩ when the test voltage is less than 500V and 0.1MΩ when 500V or more.

Therefore, when measuring the insulation resistance value of eco-friendly cars using existing insulation ohmmeter and determining whether the safety standard is observed, the insulation resistance is normal due to the lack of test voltage compared to the applied voltage of 10mA or more required for insulation resistance measurement. It is difficult to measure the value. In addition, even if the insulation resistance of the eco-friendly vehicle is excellent and the insulation resistance value is normally measured, the measurement resolution of the insulation resistance is not high, and thus it is not suitable for the determination of compliance with the automobile safety standards.

For the above reasons, domestic and overseas automobile manufacturers and inspection institutions, etc., requires an insulation resistance measurement system optimized for insulation resistance measurement of environmentally friendly vehicles.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to provide sufficient applied voltage and measurement resolution required for accurate measurement of insulation resistance in measuring insulation resistance of an eco-friendly vehicle. The present invention provides an insulation resistance measurement system and method for an environmentally friendly vehicle.

The second object of the present invention is to measure insulation resistance of an eco-friendly vehicle using an applied voltage of high voltage, and when the detected leakage current value is greater than or equal to a preset value, to measure insulation resistance of an eco-friendly vehicle that cuts off the applied voltage. A system and method are provided.

In order to achieve the above technical problem, the present invention converts a DC voltage received from a separate power supply device into a DC voltage having a predetermined size, converts a converted DC voltage into an AC voltage, and converts the converted AC voltage into a separate input. An applied voltage generation unit configured to amplify according to the value of the set voltage and the set current received from the device, and convert the amplified AC voltage into a DC voltage to generate an applied voltage; A voltage current measuring unit configured to apply an applied voltage generated through the applied voltage generator to the insulator, detect a leakage current flowing through the insulator, and convert the applied voltage and the leakage current into digital signals; An electric shock risk prevention unit generates a warning sound when the short-circuit current value of the applied voltage generated by the applied voltage generator is greater than or equal to a predetermined magnitude, and cuts off the applied voltage when the leakage current detected by the voltage current measurement unit is greater than or equal to a predetermined magnitude. ; And an insulation resistance calculation unit configured to calculate an insulation resistance value of the insulator by using the value of the applied voltage and the leakage current converted through the voltage current measurement unit. It includes.

On the other hand, the present invention is a method for measuring insulation resistance of an environmentally friendly vehicle using an insulation resistance measurement system including an applied voltage generator, a voltage current measurement unit, an electric shock risk prevention unit and an insulation resistance calculation unit, wherein the applied voltage generator is a separate power source Converts the DC voltage received from the supply device into a DC voltage of a predetermined size, converts the converted DC voltage into an AC voltage, and converts the converted AC voltage into a value of the set voltage and the set current received from a separate input device. Amplifying and converting the amplified AC voltage into a DC voltage to generate an applied voltage; Generating a warning sound informing of a risk of electric shock when the short-circuit current value of the applied voltage is greater than or equal to a predetermined magnitude; Applying, by the voltage current measuring unit, the applied voltage to the insulator, detecting the leakage current flowing through the insulator, and converting the applied voltage and the leakage current into digital signals; Blocking the applied voltage by transmitting a set voltage value and a set current value of an initial value to the applied voltage generator when the leakage current prevention unit has a leakage current value greater than or equal to a predetermined magnitude; And calculating an insulation resistance value of the insulator by using the value of the applied voltage and the leakage current converted by the insulation resistance calculator. .

According to the present invention as described above, by providing a sufficient applied voltage and the measurement resolution required for the insulation resistance measurement of the environmentally friendly vehicle, there is an effect that can facilitate the determination of compliance with the vehicle safety standards.

In addition, when the value of the detected leakage current is greater than or equal to the predetermined value, the applied voltage is cut off, thereby preventing the electric shock of the tester who measures the insulation resistance of the environmentally friendly vehicle from the leakage current.

1 is an overall configuration diagram conceptually showing an insulation resistance measuring system of an eco-friendly vehicle according to an embodiment of the present invention.
2 is an overall flow chart of a method for measuring insulation resistance of an eco-friendly vehicle according to an embodiment of the present invention.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. In the meantime, when it is determined that the detailed description of the known function and the configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, it should be noted that the detailed description is omitted.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

The insulation resistance measuring system of an environmentally friendly vehicle according to an embodiment of the present invention will be described with reference to FIG. 1 as follows.

1 is an overall configuration diagram conceptually showing an insulation resistance measuring system S of an environmentally friendly vehicle according to an embodiment of the present invention, as shown in the applied voltage generating unit 100 and the voltage current measuring unit 200. , An electric shock risk prevention unit 300, an insulation resistance calculation unit 400, a charge voltage discharge unit 500, and an inrush current limiting unit 600.

The applied voltage generation unit 100 converts the DC voltage received from the separate power supply into a stable 12V DC voltage, converts the converted DC voltage into AC voltage, and receives the converted AC voltage from the separate input device. Amplifies according to the set value and the set current value, and converts the amplified AC voltage back to a DC voltage to generate an applied voltage, as shown in FIG. 110, an AC voltage converting module 120, an AC voltage amplifying module 130, and a DC voltage converting module 140.

More specifically, the DC voltage stabilization module 110 receives a DC voltage from a separate power supply device and converts the DC voltage into a stable DC voltage of 12V using a DC / DC converter. Preferably, a separate power supply device for providing a DC voltage to the DC voltage stabilization module 110 may be an adapter for converting a 220V commercial AC voltage into a DC voltage, but the present invention is not limited thereto. The rechargeable battery may be a rechargeable battery.

In addition, the AC voltage conversion module 120 converts the DC voltage converted through the DC voltage stabilization module 110 into an AC voltage using an oscillator.

In addition, the AC voltage amplifying module 130 may adjust the booster according to the value of the set voltage and the set current received from the AC voltage converted through the AC voltage converting module 120 from a separate input device. Amplify by using Preferably, the value of the set voltage and the set current received by the AC voltage amplifying module 130 is a value set through a separate input device according to the type of insulator from the tester measuring the insulation resistance. The value may be set to a voltage value between 50V and 1000V and the value of the set current to a current value between 1mA and 20mA. The AC voltage amplification module 130 may receive the value of the set voltage and the value of the set current from a separate input device, but the present invention is not limited thereto, according to a set of rules, the set voltage value and the set current. It can be received from a separate control device that controls the value of.

In addition, the DC voltage conversion module 140 generates an applied voltage by converting the AC voltage amplified by the AC voltage amplification module 130 into a DC voltage using a rectifier circuit.

The voltage current measuring unit 200 applies the applied voltage generated through the applied voltage generator 100 to the insulator, detects a leakage current flowing through the insulator, and converts the applied voltage and the leakage current into digital signals. As shown in FIG. 1, the DC voltage applying module 210, the leakage current detecting module 220, and the AD conversion module 230 are included.

More specifically, the DC voltage applying module 210 applies the applied voltage generated through the applied voltage generator 100 to the insulator. Preferably, the applied voltage applied through the DC voltage applying module 210 has a voltage value between 50V and 1000V and a current value between 10mA and 20mA depending on the insulator to measure the insulation resistance.

In addition, the leakage current detection module 220 detects a leakage current flowing in the insulator to which the applied voltage is applied through the DC voltage application module 210.

In addition, the AD conversion module 230 converts the value of the applied voltage applied through the DC voltage application module 210 and the value of the leakage current detected through the leakage current detection module 220 to an AD converter (analog to digital converter). To convert it to a digital signal. Preferably, the AD conversion module 230 sets the value of the applied voltage applied through the DC voltage application module 210 and the value of the leakage current detected through the leakage current detection module 230 to a high resolution value. In order to achieve this, a digital signal is converted using a 22-bit or higher AD converter.

The electric shock risk prevention unit 300 generates a warning sound when the short-circuit current value of the applied voltage generated by the DC voltage conversion module 130 of the applied voltage generator 100 is 10 mA or more, and the voltage current measurement unit 200. When the value of the leakage current detected through the leakage current detection module 220 is 10mA or more performs a function to block the applied voltage, as shown in Figure 1, the warning sound generating module 310 and the applied voltage Blocking module 320 is included.

More specifically, the warning sound generating module 310 generates a warning sound indicating a danger of electric shock when the short-circuit current value of the applied voltage generated through the DC voltage conversion module 130 of the applied voltage generating unit 100 is 10 mA or more. .

When the value of the leakage current detected by the leakage current detection module 220 of the voltage current measuring unit 200 is 10 mA or more, the applied voltage blocking module 320 may alter the AC voltage of the applied voltage generating unit 100. The applied voltage is cut off by transmitting the set voltage value and the set current value of the initial value to the amplification module 130.

The insulation resistance calculation unit 400 calculates an insulation resistance value of the insulator by using the value of the applied voltage and the leakage current converted through the voltage current measurement unit 200. Preferably, the insulation resistance calculation unit 300 divides the value of the applied voltage converted into a digital signal through the voltage current measurement unit 200 according to the Ohm's law divided by the leakage current value of the insulation resistance of the insulator Calculate the value.

When the measurement of the insulation resistance is completed, the charge voltage discharge unit 500 discharges the applied voltage generated through the applied voltage generator 100.

The inrush current limiter 600 limits the inrush current when the inrush current is generated higher than the normal current value at the time of input of the power, and thus the applied voltage generator 100 and the voltage current measurer. (200), the insulation resistance calculation unit 300, the electric shock risk prevention unit 400 and the charge voltage discharge unit 500 to protect and prevent malfunction.

The above-described applied voltage generator 100, voltage current measuring unit 200, electric shock risk prevention unit 300, insulation resistance calculation unit 400, charging voltage discharge unit 500 and inrush current limiting unit 600 Referring to FIG. 2, a method for measuring insulation resistance of an eco-friendly vehicle using an insulation resistance measurement system of an eco-friendly vehicle including is as follows.

2 is a flowchart illustrating a method for measuring insulation resistance of an environmentally friendly vehicle according to an embodiment of the present invention. As illustrated, the inrush current limiting unit 600 limits the inrush current when an inrush current occurs ( S100).

The DC voltage stabilization module 110 of the applied voltage generating unit 100 receives a DC voltage from a separate power supply device and converts the DC voltage into a stable 12V DC voltage using a DC / DC converter (S200).

In addition, the AC voltage conversion module 120 of the applied voltage generating unit 100 converts the DC voltage converted through the step S200 into an AC voltage using an oscillator (S300).

In addition, the AC voltage amplification module 130 of the applied voltage generating unit 100 uses the booster according to the value of the set voltage and the set current received from the separate input device to the AC voltage converted through the step S300 Amplify by (S400).

In addition, the DC voltage conversion module 140 of the applied voltage generating unit 100 generates an applied voltage by converting the AC voltage amplified through the step S400 into a DC voltage using a rectifier circuit (S500).

In addition, when the short-circuit current value of the applied voltage generated through the step S500 is 10mA or more, the alarm sound generating module 310 of the electric shock risk prevention unit 300 generates a warning sound informing the danger of electric shock (S600).

In addition, the DC voltage applying module 210 of the voltage current measuring unit 200 applies the applied voltage generated through the step S500 to the insulator (S700).

In addition, the leakage current detection module 220 of the voltage current measuring unit 200 detects the leakage current flowing through the insulator to which the applied voltage is applied (S800).

In addition, the AD conversion module 230 of the voltage current measuring unit 200 converts the value of the applied voltage applied through the step S700 and the value of the leakage current detected through the step S800 into a digital signal using an AD converter. (S900).

In addition, the applied voltage blocking module 320 of the electric shock risk prevention unit 300 is the AC voltage amplification module 130 of the applied voltage generator 100 when the value of the leakage current detected through the step S800 is 10mA or more. In step S1000, the applied voltage is cut off by transmitting the set voltage value and the set current value.

In addition, the insulation resistance calculation unit 400 calculates the insulation resistance value of the insulator by using the value of the applied voltage and the leakage current converted through the operation S900 (S1100).

In addition, when the measurement of the insulation resistance is completed, the charging voltage discharge unit 500 discharges the applied voltage generated through the step S500 (S1200).

As described above and described with reference to a preferred embodiment for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as shown and described as described above, it is a deviation from the scope of the technical idea It will be understood by those skilled in the art that many modifications and variations can be made to the invention without departing from the scope of the invention. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

S: Insulation resistance measuring system for eco-friendly cars
100: applied voltage generating unit 110: DC voltage stabilization module
120: AC voltage conversion module 130: AC voltage amplification module
140: DC voltage conversion module 200: voltage current measuring unit
210: DC voltage application module 220: leakage current detection module
230: AD conversion module 300: electric shock risk prevention unit
310: warning sound generating module 320: applied voltage blocking module
400: insulation resistance calculation unit 500: charging voltage discharge unit
600: inrush current limiting part

Claims (7)

In the insulation resistance measurement system of environmentally friendly cars,
Converts the DC voltage received from the separate power supply into a DC voltage of a predetermined size, converts the converted DC voltage into an AC voltage, and converts the converted AC voltage into the set voltage value and the set current received from the separate input device. An applied voltage generator 100 for amplifying according to the value of A and converting the amplified AC voltage into a DC voltage again to generate an applied voltage;
The voltage current measuring unit 200 applies the applied voltage generated through the applied voltage generator 100 to the insulator, detects a leakage current flowing through the insulator, and converts the applied voltage and the leakage current into a digital signal. );
If the short-circuit current value of the applied voltage generated by the applied voltage generation unit 100 is greater than or equal to a predetermined size, a warning sound is generated, and when the value of the leakage current detected through the voltage current measurement unit 200 is greater than or equal to a predetermined magnitude, it is applied. Electric shock risk prevention unit 300 for blocking the voltage; And
An insulation resistance calculation unit 400 calculating an insulation resistance value of the insulator by using the value of the applied voltage and the leakage current converted through the voltage current measurement unit 200; Insulation resistance measurement system of an environmentally friendly vehicle comprising a.
The method of claim 1,
The applied voltage generation unit 100,
A DC voltage stabilization module 110 which receives a DC voltage from a separate power supply and converts the DC voltage into a DC voltage of a predetermined size using a DC / DC converter;
An AC voltage conversion module 120 for converting the DC voltage converted through the DC voltage stabilization module 110 into an AC voltage using an oscillator;
An AC voltage amplifying module 130 for amplifying the AC voltage converted through the AC voltage converting module 120 using a booster according to a value of a setting voltage and a setting current received from a separate input device; And
A DC voltage conversion module 140 generating an applied voltage by converting the AC voltage amplified by the AC voltage amplification module 130 into a DC voltage using a rectifier circuit; Insulation resistance measurement system of an environmentally friendly vehicle comprising a.
The method of claim 1,
The voltage current measuring unit 200,
A DC voltage application module 210 for applying an applied voltage generated through the applied voltage generator 100 to an insulator;
A leakage current detection module 220 for detecting a leakage current flowing through an insulator to which an applied voltage is applied through the DC voltage application module 210; And
AD conversion module 230 for converting the value of the applied voltage applied through the DC voltage applying module 210 and the value of the leakage current detected through the leakage current detection module 220 into a digital signal using an AD converter. ; Insulation resistance measurement system of an environmentally friendly vehicle comprising a.
The method of claim 1,
The electric shock risk prevention unit 300,
A warning sound generating module 310 for generating a warning sound informing of a risk of electric shock when the short-circuit current value of the applied voltage generated by the applied voltage generating unit 100 is equal to or greater than a predetermined size; And
When the value of the leakage current detected by the voltage current measuring unit 200 is greater than or equal to a predetermined magnitude, the applied voltage is blocked by transmitting the set voltage value and the set current value of the initial value to the applied voltage generator 100. An applied voltage blocking module 320; Insulation resistance measurement system of an environmentally friendly vehicle comprising a.
In the insulation resistance measurement method of an environmentally friendly vehicle using an insulation resistance measurement system including an applied voltage generation unit 100, voltage current measurement unit 200, electric shock risk prevention unit 300 and insulation resistance calculation unit 400,
(a) The applied voltage generation unit 100 converts the DC voltage received from the separate power supply device into a DC voltage of a predetermined size, converts the converted DC voltage into an AC voltage, and converts the converted AC voltage into a separate Amplifying according to a value of a set voltage and a set current received from an input device, and converting the amplified AC voltage into a DC voltage to generate an applied voltage;
(b) generating a warning sound informing the risk of electric shock when the short-circuit current value of the applied voltage generated through the process (a) is greater than or equal to a predetermined magnitude;
(c) the voltage current measuring unit 200 applies the applied voltage generated through the process (a) to the insulator, detects the leakage current flowing through the insulator, and applies the digital signal to the value of the applied voltage and the leakage current. The process of conversion into;
(d) when the leakage current detected by the electric shock risk prevention unit 300 is greater than or equal to a predetermined magnitude, the applied voltage generating unit 100 sets a value of an initial value and a set current; Cutting off the applied voltage by transmitting a value of? And
(e) calculating the insulation resistance value of the insulator by the insulation resistance calculator 400 using the value of the applied voltage and the leakage current converted through the process (c); Insulation resistance measurement method of an environmentally friendly vehicle comprising a.
The method of claim 5, wherein
The (a) process,
(a-1) receiving the applied voltage generator 100 by receiving a DC voltage from a separate power supply device and converting the DC voltage into a DC voltage of a predetermined size using a DC / DC converter;
(a-2) converting, by the applied voltage generator 100, the DC voltage converted through the step (a-1) into an AC voltage using an oscillator;
(a-3) The voltage generator 100 uses the booster according to the set voltage value and the set current value received from the separate input device by using the AC voltage converted through the step (a-2). Amplifying by; And
(a-4) generating an applied voltage by converting the AC voltage amplified by the applying voltage generation unit (100) into a DC voltage using a rectifying circuit (a-4); Insulation resistance measuring method of an environmentally friendly vehicle comprising a.
The method of claim 5, wherein
The step (c)
(c-1) the voltage current measuring unit 200 applying the applied voltage generated through the step (a) to the insulator;
(c-2) the voltage current measuring unit 200 detecting a leakage current flowing through the insulator to which the applied voltage is applied through the step (c-1); And
(c-3) The AD converter uses the value of the applied voltage applied by the voltage current measuring unit 200 through the step (c-1) and the value of the leakage current detected through the step (c-2). Converting to a digital signal; Insulation resistance measuring method of an environmentally friendly vehicle comprising a.

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