KR20000005026U - Insulation voltage measuring device for electric vehicles - Google Patents

Abstract

The present invention relates to an insulation voltage measuring device, and more particularly, to supply power so that a vehicle can be driven to measure an insulation voltage according to a voltage applied from a main battery of an electric vehicle to inform a user that an insulation voltage of a vehicle is lost. A main battery (100) for making it; A sensing unit 200 which receives power applied from the main battery 100 and detects an insulation voltage and a voltage applied to a vehicle and outputs a signal; A microcomputer 300 that receives the sensing signal output from the sensing unit 200 and compares the insulation voltage with the voltage applied to the vehicle and outputs a control signal; It characterized in that it comprises a display unit 400 for receiving the control signal output from the microcomputer 300 to display the insulation state of the vehicle to the user, the present invention is the driver or user while driving the electric vehicle main By detecting and displaying the leakage current flowing in advance due to the high voltage applied from the battery, it is possible to prevent personnel accidents and object damage due to overcurrent.

Description

Insulation voltage measuring device for electric vehicles

The present invention relates to an insulation voltage measuring apparatus, and more particularly, to an insulation voltage measuring apparatus for an electric vehicle that measures an insulation voltage according to a voltage applied from a main battery of an electric vehicle to inform a user that the insulation voltage of the vehicle is lost. It is about.

As is well known, electric vehicle propulsion system is composed of various electric modules such as main battery, drive system, and motor to supply power of 300VOLTS or more from main battery, and the International Electrotechnical Commission (IEC) COMMISSION) specifies that the leakage current in electric vehicles is 1 mA or less.

However, the conventional electric vehicle as described above uses a high voltage of about 300 VOLTS, and thus, if the voltage applied from the main battery is not insulated, there is a problem that a fatal accident and damage to the vehicle and the user may occur.

The present invention is to solve the above conventional problems, in particular, by measuring the midpoint of the voltage applied from the main battery to compare the measured voltage and the set voltage at the microcomputer insulated voltage to the voltage applied from the battery to the user To provide an electric vehicle insulation voltage measurement device to inform.

In order to achieve the above object, the present invention is an electric vehicle insulation voltage measuring device, the main battery for applying power to drive the vehicle; A sensing unit which receives a power applied from the main battery and detects an insulation voltage and a voltage applied to a vehicle and outputs a signal; A microcomputer receiving the sensing signal output from the sensing unit and comparing the insulation voltage with the voltage applied to the vehicle to output a control signal; And a display configured to receive the control signal output from the microcomputer and display the insulation state of the vehicle to the user.

1 is a block diagram showing an insulation voltage measuring apparatus of an electric vehicle according to an embodiment of the present invention;

2 is a circuit diagram illustrating a sensing unit in an insulation voltage measuring apparatus for an electric vehicle according to an exemplary embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

100: main battery 200: detector

210: first resistor 220: second resistor

230: constant voltage diode 240: first amplifier

250: first noise removing unit 251: fourth resistor

252: first capacitor 260: second noise removing unit

261: third resistor 262: second capacitor

270: second amplifier 280: A / D conversion unit

300: microcomputer 400: display unit

Hereinafter, described in detail through the embodiment according to the present invention as described above.

As shown in FIG. 1, first, the main battery 100 applies power to drive a vehicle, and the sensing unit 200 receives power applied from the main battery 100. It senses the insulation voltage and the voltage applied to the vehicle and outputs the detection signal.

In addition, the microcomputer 300 receives the sensing signal output from the sensing unit 200, compares the insulation voltage with the voltage applied to the vehicle, and outputs a control signal, and the display unit 400 outputs the control signal. It receives the control signal output from and displays the insulation state of the vehicle to the user.

Meanwhile, the first and second resistors 210 and 220 of the sensing unit 200 distribute the voltages so that the + and − voltages applied from the main battery 100 may be applied as the set voltage, and the constant voltage diode 230 prevents a negative voltage applied through the second resistor 220 from being applied as a positive voltage.

In addition, the first amplifier 240 receives the −voltage applied through the second resistor 220 and the + voltage applied through the first resistor 210 and amplifies the set voltage to be applied to the vehicle. The first noise removing unit 250 includes a fourth resistor 251 and a first condenser 252 to remove noise included in the voltage applied to the first amplifier 240.

In addition, the second noise removing unit 260 is composed of a third resistor 261 and a second capacitor 262 to receive the + voltage applied through the first resistor 210 and the + voltage is grounded to the chassis ground terminal. Instead, the noise is removed to be applied to the first amplifier 240, and the second amplifier 270 receives the + voltage applied through the first resistor 210 to receive the second noise agent. The potential difference between the third resistor 261 of the rejection 260 and the chassis ground is amplified to output an insulation voltage.

Then, the A / D converter 280 receives the vehicle driving voltage and the insulation voltage output from the first and second amplifiers 240 and 270, converts the analog signal into a digital signal, and outputs the analog signal. Configure an example.

Hereinafter, an operation process of the insulation voltage measuring apparatus for an electric vehicle configured as described above will be described.

When the driver or the user turns on the power to drive the vehicle, the main battery 100 applies a power of about 300 VOLTS to drive the vehicle, and senses the +,-voltage applied from the main battery 100 When the first and second resistors 210 and 220 of the unit 200 receive + and − voltages so as to be applied to the vehicle at a set voltage, the constant voltage diode 230 outputs the second resistor ( The voltage applied through 220 is prevented from being applied to the + voltage applied through the first resistor 210.

Meanwhile, the + and-voltages applied through the first and second resistors 210 and 220 are input by the first amplifier 240 and amplified so that a set voltage can be applied to a vehicle (not shown). The first noise removing unit 250 including the fourth resistor 251 and the first condenser 252 removes noise so that the set voltage can be applied to the vehicle by the first amplifier 240.

In addition, the + voltage applied through the first resistor 210 is input from the second noise removing unit 260 including the third resistor 261 and the second capacitor 262, and the + voltage is grounded to the chassis ground terminal. Instead, the noise is removed to be applied to the first amplifier 240, and the second noise receiver receives the + voltage applied through the first resistor 210 from the second amplifier 270. The potential difference between the third resistor 261 of the rejection 260 and the chassis ground terminal is amplified to detect and output an insulation voltage.

Then, the vehicle driving voltage and the insulation voltage output from the first and second amplifiers 240 and 270 are input from the A / D converter 280 to convert the analog signal into a digital signal and output the digital signal. When the digital signal output from the / D converter 280 is input from the microcomputer 300 and the control voltage is output by comparing the insulation voltage according to the vehicle driving voltage, the control signal output from the microcomputer 300 is displayed. The input from the unit 400 displays the current insulation state of the vehicle to the user.

As described above, the insulation voltage measuring device of the inventive electric vehicle detects and displays a leakage current flowing due to a high voltage applied from a main battery while a driver or a user drives the electric vehicle, thereby causing a human accident and There is an effect that can prevent damage to the object.

Claims (2)

A main battery for supplying power to drive the vehicle; A sensing unit which receives a power applied from the main battery and detects an insulation voltage and a voltage applied to a vehicle and outputs a signal; A microcomputer receiving the sensing signal output from the sensing unit and comparing the insulation voltage with the voltage applied to the vehicle to output a control signal; And a display unit configured to receive the control signal output from the microcomputer and display the insulation state of the vehicle to the user. The display apparatus of claim 1, wherein the sensing unit comprises: first and second resistors for distributing voltages such that + and − voltages applied from the main battery are applied to a set voltage; A constant voltage diode which prevents a negative voltage applied through the second resistor from being applied to a positive voltage; A first amplifier configured to receive the −voltage applied through the second resistor and the + voltage applied through the first resistor and amplify and output the amplified voltage to be applied to the vehicle; A first noise removing unit comprising a fourth resistor and a first capacitor to remove noise included in a voltage applied to the first amplifier; A second noise removing unit comprising a third resistor and a second capacitor and receiving a voltage applied through the first resistor to remove noise to be applied to the first amplifier without being grounded to the chassis ground terminal; A second amplifier configured to receive an + voltage applied through the first resistor and amplify a potential difference between the third resistor of the second noise removing unit and the chassis ground terminal to output an insulation voltage; Insulation voltage measuring device of an electric vehicle, characterized in that it comprises an A / D conversion unit for receiving the vehicle driving voltage and the insulation voltage output from the first and second amplifiers to convert the analog signal into a digital signal and output .