KR20100083481A - Multi-channel insulation resistance measuring apparatus - Google Patents

Abstract

PURPOSE: A multi-channel insulation resistance measuring apparatus, which simultaneously measures insulation resistance, is provided to be connected with the various external equipments. CONSTITUTION: A high voltage provider(20) offers the high voltage for the insulation resistance measurement to the measured body. Voltage can be varied. A driving voltage provider(30) can vary the driving voltage while offering the driving voltage. A controller(60) controls the high voltage offer part and driving voltage offer part. The high voltage for measurement and driving voltage is adjusted. The insulation resistance of the measured body is produced from the current and the voltage measured at with the current measurement area and voltage measurement part.

Description

Multi-channel insulation resistance measuring apparatus

The present invention relates to an insulation resistance measuring apparatus for measuring the insulation resistance of a subject under test, and more particularly, to measure the insulation resistance of a plurality of subjects at the same time and to output the measurement results as analog and digital signals. A multi-channel insulation resistance measuring apparatus.

In general, when a high voltage of 100 to 1000 Vdc is applied to an insulator through which no current flows, a small amount of current flows through the insulator due to the surface resistance of the insulator. Insulation resistance is called.

The insulation resistance measurement is mainly used to check the safety of users and the stability of various electronic products / equipment, and an insulation resistance measurement apparatus is provided for this purpose.

As described above, the insulation resistance measuring apparatus includes a function capable of providing such a high voltage because a high voltage of 100 to 1000 Vdc must be applied to the object to be measured in order to measure the insulation resistance.

However, since the conventional insulation resistance measuring device is configured to measure only one channel, when measuring the insulation resistance of a plurality of objects to be measured at the same time, several insulation resistance measuring devices should be used.

In particular, when it is intended to be applied in the manufacturing process, several insulation resistance measuring devices should be used, and communication lines for measuring the measurement values for each channel should be connected, and when the mechanical target part is included according to the measuring object Since a separate drive power source is required to drive the device, several additional devices including a device for providing the drive power source are needed.

As described above, in the prior art, when a plurality of products produced in a manufacturing process for mass production are to be inspected, a plurality of insulation resistance measuring devices must be used and a number of additional equipment must be added. There was a problem that the cost is high.

Therefore, the present invention has been proposed to solve such a conventional problem, and to provide a multi-channel insulation resistance measuring apparatus capable of simultaneously measuring the insulation resistance of a plurality of objects to be measured and outputting the measurement results as analog and digital signals. .

As a means for solving the above problems, the multi-channel insulation resistance measuring apparatus according to an embodiment of the present invention, the high voltage for providing a high voltage for measuring insulation resistance to at least one object to be measured, the high voltage for measuring the insulation resistance is variable Providing unit; A driving voltage providing unit configured to provide a driving voltage for driving the one or more measured objects, and wherein the driving voltage is variable; A current measuring unit measuring a current flowing through each of the one or more target objects; A voltage measuring unit measuring a high voltage applied to the at least one measured object; The high voltage providing unit and the driving voltage providing unit are controlled to adjust the high voltage and the driving voltage for measuring insulation resistance applied to the object under test, and then at least one from the current and voltage values measured by the current measuring unit and the voltage measuring unit. A control unit for calculating an insulation resistance of the object under test; A communication unit for transmitting the insulation resistance value calculated by the control unit according to the control of the control unit according to a prescribed communication method; An analog output unit converting the insulation resistance value calculated by the controller into an analog signal and outputting the analog signal according to the control of the controller; And a display unit for visually outputting the insulation resistance value calculated by the controller under the control of the controller.

In addition, the multi-channel insulation resistance measuring apparatus may further include a rectifying circuit unit for receiving the AC power to convert the DC power supply to the high voltage providing unit and the driving voltage providing unit.

In the multi-channel insulation resistance measuring apparatus, the high voltage providing unit, a high voltage generating circuit unit for boosting the input DC power to a high voltage of a level set under the control of the controller; And a first relay circuit unit configured to operate under the control of the controller to simultaneously apply the high voltage generated by the high voltage generation circuit unit to the one or more to-be-measured objects, wherein the driving voltage providing unit supplies the input DC voltage. A variable voltage generation circuit unit variable to a driving voltage having a set level according to the control of the controller; And a second relay circuit part operated under the control of the controller to simultaneously apply the driving voltage output from the variable voltage generation circuit part to the one or more to-be-measured objects.

The high voltage generation circuit unit may include: a first digital variable resistor whose resistance value is changed under the control of the controller; And a boost regulator configured to boost the input DC power at a ratio corresponding to the resistance value of the first digital variable resistor and change the voltage to a high voltage set. The variable voltage generation circuit unit may be configured to include a resistor under control of the controller. A second digital variable resistor whose value is variable; And a pressure reducing regulator configured to generate a driving voltage having a set level by reducing the input DC power at a ratio corresponding to the resistance value of the second digital variable resistor.

In addition, in the multi-channel insulation resistance measuring apparatus, the voltage measuring unit includes: a voltage divider circuit unit for extracting a high voltage signal applied to the at least one to-be-measured object and reducing it at a predetermined ratio; A filter and amplifying circuit unit for filtering and amplifying the voltage signal output from the voltage dividing circuit unit; And an A / D conversion circuit unit converting the voltage signal output from the filter and the amplifying circuit unit into a digital value and applying the same to the controller.

According to the above-described problem solving means, the multi-channel insulation resistance measuring apparatus of the present invention is configured with a simple configuration and low cost, it is possible to quickly and easily measure the insulation resistance value for a large number of objects to be measured, By outputting the measured insulation resistance value in digital and analog form, it can be linked with various external equipments. As a result, it can be applied to mass production automation system without adding complicated equipment and cost, and can quickly and easily adjust the insulation resistance of many products produced. Can be checked

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing in detail the operating principle of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, the same reference numerals are used for parts having similar functions and functions throughout the drawings.

In addition, throughout the specification, when a part is 'connected' to another part, it is not only 'directly connected' but also 'indirectly connected' with another element in between. Include. In addition, the term 'comprising' a certain component means that the component may be further included, without excluding the other component unless specifically stated otherwise.

1 is a block diagram of a multi-channel insulation resistance measuring apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 1, the multi-channel insulation resistance measuring apparatus according to the present invention applies a high voltage and a driving voltage to one or more objects to be measured 10 at the same time, thereby easily insulating the insulation resistance of the plurality of objects 10. In addition, the measured insulation resistance values may be transmitted to other external devices through a prescribed communication method, and the measured insulation resistance values may be output in an analog signal form.

Here, the object to be measured 10 may be, for example, a DC motor as an electronic product or equipment requiring insulation resistance measurement.

To this end, the multi-channel insulation resistance measuring apparatus according to the present invention includes a high voltage providing unit 20, a driving voltage providing unit 30, a current measuring unit 40, a voltage measuring unit 50, and a controller 60. ), A communication unit 70, an analog output unit 80, a display unit 90, and a rectifier circuit unit 100.

In the above, the high voltage providing unit 20 generates a high voltage (for example, 100 to 1000 Vdc) of a predetermined level for measuring the insulation resistance and simultaneously supplies the at least one object under test 10 through a plurality of measurement channels. In this case, the high voltage for measuring insulation resistance generated by the high voltage providing unit 20 may be variable according to the control of the controller 60.

2 is a block diagram showing the configuration of the high voltage providing unit 20. Referring to this, the high voltage providing unit 20 converts the input DC power into a high voltage at a level set under the control of the control unit 60. A high voltage generation circuit unit 21 for boosting and a high voltage generated by the high voltage generation circuit unit 21 to be simultaneously applied to the one or more target objects through a plurality of measurement channels; 1 relay circuit section 22 is made.

Here, the high voltage generation circuit unit 21 corresponds to a first digital variable resistor 211 whose resistance value is changed according to the control of the controller 60 and a resistance value of the first digital variable resistor 211. A boost regulator 212 is configured to increase the input DC power at a ratio and change the voltage to a high voltage set.

That is, the high voltage providing unit 20 boosts the DC power input through the boost regulator 212 to a high voltage of a predetermined level, and then applies the first relay circuit unit 22 operated under the control of the control unit 60. By a plurality of measurement channels connected to each object under test 10. In this case, the boosting ratio by the boost regulator 212 is varied according to the resistance value of the first digital variable resistor 211. In addition, the first relay circuit part 22 implements independence between the plurality of measurement channels connected to the plurality of objects 10 and prevents short between the measurement channels.

Referring back to FIG. 1, the driving voltage providing unit 30 of the multi-channel insulation resistance measuring apparatus is driven by the measured object 10 when the at least one measured object 10 includes a mechanical driver. By providing a voltage, the driving voltage is variable under the control of the controller 60. If the driving voltage is not required for the measurement target object 10, the driving voltage providing unit 30 may not output the driving voltage to the measurement object 10 under the control of the controller 60. have.

FIG. 3 is a block diagram illustrating an internal configuration of the driving voltage measuring unit 30. Referring to this, the driving voltage providing unit 30 controls the input DC power to a level set according to the control of the control unit 60. A variable voltage generator circuit 31 that is variable with a drive voltage and a drive voltage output from the variable voltage generator circuit 31 by operating under the control of the controller 60 are simultaneously applied to the at least one object under test 10. It comprises a first relay circuit portion 32 to apply.

In addition, the variable voltage generation circuit part 31 corresponds to a second digital variable resistor 311 whose resistance value is variable under the control of the controller 60 and a resistance value of the second digital variable resistor 311. And a decompression regulator 312 which decompresses the input DC power at a ratio to vary the input DC power to a driving voltage of a set level.

Referring back to FIG. 1, the current measuring unit 40 is for measuring a current value required to calculate an insulation resistance, and is provided between the driving voltage providing unit 30 and the object under test 10. The current flowing through each of the one or more objects to be measured 10 is measured. Although not shown in the drawing, the current value measured by the current measuring unit 40 is converted into a digital value through an A / D conversion circuit and then applied to the controller 60.

In addition, the voltage measuring unit 50 measures the high voltage applied to the one or more objects to be measured 10. At this time, since the applied high voltage is usually very high, such as 100 to 1000 Vdc, the voltage measuring unit 50 is The high voltage is measured by dividing the voltage at a constant ratio.

4 is a block diagram illustrating a configuration of the voltage measuring unit 50. Referring to this, the voltage measuring unit 50 extracts a high voltage signal applied to the one or more objects under test 10 by a predetermined ratio. A voltage dividing circuit section 51 for reducing the voltage, a filter and amplifying circuit section 52 for filtering and amplifying the voltage signal output from the voltage dividing circuit section 51, and a voltage signal output from the filter and amplifying circuit section 52. The A / D conversion circuit unit 53 converts the digital value into a digital value and applies it to the control unit 60.

Referring back to FIG. 1, the controller 60 controls the overall operation of the multi-channel insulation resistance measuring apparatus and calculates an insulation resistance value. More specifically, the high voltage providing unit 20 and the driving voltage are calculated. The providing unit 30 is controlled to adjust the high voltage and the driving voltage for measuring insulation resistance and apply the same to one or more objects under test 10. In this case, the high voltage and the driving voltage value for measuring insulation resistance may be set by the controller 60 to recognize and set a value instructed by the user through an input unit (not shown). The settings can be saved and automatically adjusted. The controller 60 calculates insulation resistance of each of the one or more objects to be measured 10 from the current and voltage values measured by the current measuring unit 30 and the voltage measuring unit 40. That is, the insulation resistance of the object under test 10 is calculated from the ratio of the current generated in the object under test 10 to the high voltage applied to the object under test 10. The controller 60 may be implemented as a micro control unit (MCU).

When the insulation resistance of one or more objects to be measured 10 is calculated, the controller 60 outputs the calculated insulation resistance through the communication unit 70, the analog output unit 80, and the display unit 90.

The communication unit 70 is wired or wireless communication in accordance with various communication schemes, for example, RS-232, RS-422, RS-485, TCP-IP, Zigbee, Bluetooth, etc. under the control of the control unit 60. The result value calculated by the controller 60 is transmitted to an external device through a medium. The multi-channel insulation resistance measuring apparatus of the present invention can interoperate with various types of external devices including a PC through the communication unit 70.

The analog output unit 80 outputs an insulation resistance value of at least one measured object 10 calculated by the control unit 60 in the form of an analog signal under the control of the control unit 60. To this end, the analog output unit 80 includes a D / A conversion circuit (not shown) for converting data output from the control unit 60 into an analog signal.

The display unit 90 visually outputs an insulation resistance value calculated by the controller 60 under the control of the controller 60.

Finally, the rectifier circuit unit 100 receives an AC power, converts it into a DC power, and applies the AC power to the high voltage providing unit 20 and the driving voltage providing unit 30.

According to the above configuration, the multi-channel insulation resistance measuring apparatus of the present invention can apply a high voltage and a driving voltage for insulation resistance measurement to a plurality of objects to be measured 10 simultaneously, and accordingly each object 10 The insulation resistance of each of the plurality of objects to be measured 10 may be independently measured by extracting a current generated in the X-ray. The multi-channel insulation resistance measuring apparatus of the present invention is applied to a mass production automation facility, so that it is possible to quickly and easily measure the insulation resistance of a large number of electronic devices / equipment mass produced in the facility.

Next, FIG. 5 is an operation flowchart of the multi-channel insulation resistance measuring apparatus according to the present invention, and the operation of the multi-channel insulation resistance measuring apparatus configured as described above will be sequentially described with reference to this.

A plurality of objects to be measured 10 to measure the insulation resistance is connected to the multi-channel insulation resistance measuring apparatus according to the present invention. That is, the high voltage application point, the driving voltage application and the current detection point of the object under test 10 are electrically connected to the multichannel insulation resistance measuring device. The plurality of objects 10 are preferably the same kind of products.

In the above state, when the power of the multi-channel insulation resistance measuring device is turned on, the control unit 60 of the multi-channel insulation resistance measuring device performs system initialization (S51).

Then, the control unit 60 sets a high voltage value for measuring insulation resistance to be applied to the measurement target object 10 and determines whether the high voltage actually generated by the high voltage providing unit 20 matches the set high voltage value. Check (S53, S54). In this step, the controller 60 adjusts the first digital variable resistor 211 of the high voltage providing unit 20 to a resistance value corresponding to the high voltage value to be set, and the boost regulator 212 responds to the resistance value. By boosting the input DC voltage at a ratio of

By the above, when setting of the high voltage for insulation resistance measurement is completed, the control part 60 next sets the drive voltage of the object under test, and the voltage actually generated by the drive voltage providing part 30 is equal to the set voltage. Check whether it matches (S54, S55). In this step, the controller 60 adjusts the second digital variable resistor 311 of the driving voltage providing unit 30 to a resistance value corresponding to the set driving voltage, and the pressure reduction regulator 312 adjusts the resistance value. By depressurizing the input DC voltage at a ratio corresponding to.

As described above, when both the high voltage and the driving voltage necessary for the insulation resistance measurement are prepared, the controller 60 controls the second relay circuit part 32 to determine a plurality of driving voltages generated by the pressure reduction regulator 312. It is applied to the measuring body 10 (S56).

After waiting a predetermined time until the plurality of objects 10 are operated by the application of the driving voltage (S57), the control unit 60 then controls the first relay circuit unit 22, The high voltage for insulation resistance measurement generated by the boost regulator 212 is simultaneously applied to the plurality of objects 10 (S58).

When the driving voltage and the high voltage for insulation resistance measurement are applied, independence between the plurality of objects 10 may be maintained by the first and second relay circuits 22 and 32, and a short may be prevented.

As described above, when the high voltage for measuring the driving voltage and the insulation resistance is applied, the high voltage value applied to the plurality of objects 10 by the current measuring unit 40 and the voltage measuring unit 50 and the measured object ( The current value flowing in 10 is measured and output to the controller 60 (S59).

The control unit 60 calculates the insulation resistance of each object under test 10 by using the input high voltage measurement value and the current measurement value, that is, the ratio of the current to the high voltage (S60).

In addition, the controller 60 visually displays the calculated insulation resistance value of each measured object 10 through the display unit 90 so that the measurer can confirm (S61), and, in addition, according to the transfer request of the measurer. Initialize the communication port of the communication unit 70 and transmit the calculated insulation resistance measurement value to other equipment (S62 to 64), or according to the analog output request of the measurer, the calculated insulation resistance measurement value is transmitted to the analog output unit 80. ) Is converted into an analog signal and outputted (S65, S66).

According to the present invention, the insulation resistance measuring apparatus according to the present invention can easily and quickly measure insulation resistance values of a plurality of objects to be measured 10, and outputs the measured values in digital or analog form, and compares them with other equipment. Enable interworking of.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art.

The insulation resistance measuring apparatus according to the present invention can measure the insulation resistance of a large number of objects quickly and output the measurement results in various forms, thereby being applied to the mass production automation system of various electronic products. Insulation resistance inspection and quality inspection can be made through this, and the facility can be simplified and the cost can be reduced.

1 is a block diagram of a multi-channel insulation resistance measuring apparatus according to the present invention.

2 is a block diagram showing a configuration of a high voltage providing unit in a multi-channel insulation resistance measuring apparatus according to the present invention.

3 is a block diagram showing a configuration of a driving voltage providing unit in a multi-channel insulation resistance measuring apparatus according to the present invention.

4 is a block diagram showing a configuration of a voltage measuring unit in a multi-channel insulation resistance measuring apparatus according to the present invention.

5 is an operation flowchart of a multi-channel insulation resistance measuring apparatus according to the present invention.

Claims (7)

A high voltage providing unit configured to provide a high voltage for measuring insulation resistance to at least one object to be measured, and wherein the high voltage for measuring insulation resistance is variable; A driving voltage providing unit configured to provide a driving voltage for driving the one or more measured objects, and wherein the driving voltage is variable; A current measuring unit measuring a current flowing through each of the one or more target objects; A voltage measuring unit measuring a high voltage applied to the at least one measured object; The high voltage providing unit and the driving voltage providing unit are controlled to adjust the high voltage and the driving voltage for insulation resistance measurement applied to the object under test, and the one or more values are measured from the current and voltage values measured by the current measuring unit and the voltage measuring unit. A control unit for calculating an insulation resistance of the object under test; A communication unit for transmitting the insulation resistance value calculated by the control unit according to a control of the control unit according to a prescribed communication method; An analog output unit converting the insulation resistance value calculated by the controller into an analog signal and outputting the analog signal according to the control of the controller; And And a display unit for visually outputting the insulation resistance value calculated by the controller under the control of the controller. The method of claim 1, And a rectifier circuit unit configured to receive an AC power and convert the AC power into a DC power supply to the high voltage providing unit and the driving voltage providing unit. The method of claim 1, wherein the high voltage providing unit A high voltage generation circuit unit converting the input DC power into a high voltage of a level set under the control of the controller; And And a first relay circuit unit operating under the control of the controller to simultaneously apply the high voltage generated by the high voltage generation circuit unit to the one or more to-be-measured objects. The method of claim 1, wherein the driving voltage providing unit A variable voltage generation circuit unit configured to vary the input DC power to a driving voltage having a level set according to the control of the controller; And And a first relay circuit unit operated under the control of the controller to simultaneously apply a driving voltage output from the variable voltage generation circuit unit to the one or more to-be-measured objects. The method of claim 1, wherein the voltage measuring unit A voltage divider circuit unit configured to extract a high voltage signal applied to the at least one to-be-measured object and reduce it at a predetermined ratio; A filter and amplifying circuit unit for filtering and amplifying the voltage signal output from the voltage dividing circuit unit; And And an A / D conversion circuit unit converting the voltage signal output from the filter and amplifying circuit unit into a digital value and applying the same to the controller. The method of claim 3, wherein the high voltage generating circuit portion A first digital variable resistor whose resistance value is variable according to the control of the controller; And And a boost regulator for boosting the input DC power at a ratio corresponding to the resistance value of the first digital variable resistor. The method of claim 4, wherein the variable voltage generating circuit portion A second digital variable resistor whose resistance value is variable according to the control of the controller; And And a pressure reducing regulator configured to reduce the input DC power at a ratio corresponding to the resistance value of the second digital variable resistor to change the driving voltage to a set level.

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