KR20100046293A - Absolute evaluation system of capacitor and inductor using voltage transformer compartator and absolute evaluation method thereof - Google Patents

Absolute evaluation system of capacitor and inductor using voltage transformer compartator and absolute evaluation method thereof Download PDF

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KR20100046293A
KR20100046293A KR1020080105067A KR20080105067A KR20100046293A KR 20100046293 A KR20100046293 A KR 20100046293A KR 1020080105067 A KR1020080105067 A KR 1020080105067A KR 20080105067 A KR20080105067 A KR 20080105067A KR 20100046293 A KR20100046293 A KR 20100046293A
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South Korea
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capacitor
inductor
voltage
voltage transformer
resistor
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KR1020080105067A
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Korean (ko)
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정재갑
한상길
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한국표준과학연구원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2611—Measuring inductance

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  • Engineering & Computer Science (AREA)
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  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The present invention provides an absolute evaluation device for a capacitor and an inductor using a voltage transformer comparator having an N terminal and an X terminal, comprising: an AC voltage source for applying an AC voltage; And a first element and a second element sequentially connected to an AC voltage source, wherein one of the first element and the second element is a resistor, the other element is a capacitor, or an inductor. Absolute evaluation system and evaluation method of capacitor and inductor using voltage transformer comparator, which is electrically connected between N terminal and X terminal, is implemented.The voltage transformer comparator is used to connect capacitor and inductor at rated voltage of AC 60Hz. Since the absolute measurement can be performed, the capacitance and inductance of the sample can be measured by measuring the phase error according to the change of the resistance value in the voltage transformer comparator using the equivalent circuit and the voltage vector analysis.

Description

Absolute Evaluation System of Capacitor and Inductor Using Voltage Transformer Compartator and Absolute Evaluation Method Thereof}

The present invention relates to an absolute evaluation system of a capacitor and an inductor using a voltage transformer comparator. More particularly, a capacitor using a voltage transformer comparator capable of absolute measurement of a capacitor and an inductor at a rated voltage of 60 Hz using a voltage transformer comparator. And an absolute evaluation system and evaluation method of an inductor.

Capacitors and inductors are used in applications such as low-voltage circuits, power circuits, and power systems. They are also used in applications requiring precision, such as voltage divider calibration and calibration of measurement devices such as LCR meters. In addition, high-capacity capacitors of 1µF and higher and high-inductance inductors of 1H and higher are commercially available. Therefore, accurate measurement technology of capacitors and inductors is required.

Until now, measurement of capacitors and inductors at AC 60Hz has been carried out using LCR meters and impedance analyzers, or measurement methods using capacitor bridges or inductor bridges. However, the LCR meter measurement has a problem that the measured value is affected by the error of the LCR meter without applying a voltage up to the target sample.

In addition, the measurement of capacitors and inductors using bridges at 60 Hz is based on comparative measurements with standard devices, which are based on comparative measurements with standard devices. There is a difficult issue.

Accordingly, the present invention has been made to solve the above problems, an absolute evaluation system of a capacitor and an inductor using a voltage transformer comparator capable of absolute measurement of the capacitor and the inductor at a rated voltage of AC 60Hz using a voltage transformer comparator and The purpose is to provide an evaluation method.

An object of the present invention as described above is an absolute evaluation device of a capacitor and an inductor using a voltage transformer comparator having an N terminal and an X terminal, the AC voltage source for applying an AC voltage; And a first element and a second element sequentially connected to an AC voltage source, wherein one of the first element and the second element is a resistor, the other element is a capacitor, or an inductor. It can be achieved by an absolute evaluation system of a capacitor and an inductor using a voltage transformer comparator, which is electrically connected between the N terminal and the X terminal.

In another category, an object of the present invention is to provide an absolute evaluation method of a capacitor and an inductor using a voltage transformer comparator having an N terminal and an X terminal, wherein any one selected from a resistor, an inductor, or a capacitor is applied such that an AC voltage is applied from an AC voltage source. A first step of connecting the first device and the second device in series and connecting the N terminal and the X terminal of the comparator of the voltage transformer; Applying an AC voltage to the resistor and the inductor or capacitor; A third step of repeatedly measuring a phase angle error using the voltage transformer comparator to calculate an average value of the slope; And a fourth step of obtaining the inductor value or the capacitor value from the average slope, which can be achieved by an absolute evaluation method of the capacitor and the inductor using the voltage transformer comparator.

According to the present invention, since the capacitor and the inductor can be absolutely measured at the rated voltage of AC 60Hz using the voltage transformer comparator, the phase error is measured in accordance with the change of the resistance value in the voltage transformer comparator by analyzing the equivalent circuit and voltage vector. There is an effect that can measure the capacitance and inductance of the sample.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. Before describing the present invention, if it is determined that the detailed description of the related air function and configuration may unnecessarily obscure the subject matter of the present invention, the description thereof will be omitted.

<Absolute Evaluation System of Capacitors and Inductors Using Voltage Transformers>

1 is a configuration of a capacitor and inductor absolute evaluation system using a voltage transformer comparator according to the present invention. The absolute evaluation system of the capacitor 30 and the inductor 40 using the voltage transformer comparator 100 according to the present invention includes an AC voltage source 10, a resistor 20, a capacitor 30 or an inductor 40, and a voltage transformer comparator ( 100).

(Capacitor absolute evaluation system)

1A is a block diagram of an absolute capacitor evaluation system using a voltage transformer comparator according to the present invention. The resistor 20 and the capacitor 30 according to the present invention are sequentially connected in series to receive an AC voltage from the AC voltage source 10. Here, the resistor 20 has a phase angle error of 0.01% or less, that is,

Figure 112008074149243-PAT00001
It is preferable to use the phosphorous resistor 20. Where X b is ... and R b is ... In addition, the resistor 20 may be arbitrarily selected and variable within the range of 1/1000 to 1/100 times of the capacitor 30.

Any point between the AC voltage source 10 and the resistor 20 (hereinafter referred to as 'a point (a)') and any point between the resistor 20 and the capacitor 30 (hereinafter 'b point (b)' Are connected to the X terminal 110 and the N terminal 120 of the voltage transformer comparator 100, respectively.

(Inductor Absolute Rating System)

Figure 1b is a block diagram of an absolute inductor evaluation system using a voltage transformer comparator according to the present invention. The inductor 40 and the resistor 20 according to the present invention are sequentially connected in series to receive an AC voltage from the AC voltage source 10. Here, the resistor 20 has a phase angle error of 0.01% or less, that is,

Figure 112008074149243-PAT00002
It is preferable to use the phosphorous resistor 20. In addition, the resistor 20 may be arbitrarily selected and variable within the range of 100 to 1000 times the inductor 40.

Any point between the AC voltage source 10 and the inductor 40 (hereinafter referred to as' c point (c) ') and any point between the inductor 40 and the resistor 20 (hereinafter' d point (d) Are connected to the X terminal 110 and the N terminal 120 of the voltage transformer comparator 100, respectively.

Principles of Evaluation Techniques

(Principle of Capacitor Evaluation Technique)

Figure 2 shows an equivalent circuit and voltage vector diagram for capacitor evaluation. The voltage transformer comparator 100 is a device for measuring the error and phase angle error by comparing the magnitude and phase of the voltages of the secondary side of the two voltage transformer. To understand the principle of evaluating the capacitor 30 using the voltage transformer comparator 100, as shown in FIG. 2, a vector diagram of an equivalent circuit and a voltage in which the resistor 20 and the capacitor 30 are connected in series is used. Point a and point b are respectively connected to the X terminal 110 and the N terminal 120 of the voltage transformer comparator 100. Shown in Figure 2

Figure 112008074149243-PAT00003
Is the voltage vector at both ends of the resistor 20 and the capacitor 30,
Figure 112008074149243-PAT00004
Is the voltage vector across the resistor 20,
Figure 112008074149243-PAT00005
Denotes the voltage vector at both ends of the capacitor.

Phase angle error measured by the voltage transformer comparator 100 shown in FIG.

Figure 112008074149243-PAT00006
Can be obtained using Equation 1 below.

Figure 112008074149243-PAT00007

Here, β R + C is the phase of the voltage across the resistor 20 and the capacitor 30, β C is the phase of the voltage across the capacitor 30, X C is the reactance of the capacitor, and ω is the angular frequency.

Applying a constant voltage in Equation 1, measuring the phase angle error while changing the resistance 20 and fitting to the linear function of the resistor 20, the slope becomes ω C can be obtained a value of C.

(Principle of Inductor Evaluation Technology)

3 shows an equivalent circuit and voltage vector diagram for inductor evaluation. As shown in FIG. 3, the principle of evaluating the inductor 40 using the voltage transformer comparator 100 will be described using a vector diagram and an equivalent circuit in which the inductor 40 and the resistor 20 are connected in series. As shown in the equivalent circuit of FIG. 2, point c and point d are respectively connected to the X terminal 110 and the N terminal 120 of the voltage transformer comparator 100. Phase Angle Error Measured by Voltage Transformer Comparator 100

Figure 112008074149243-PAT00008
May be expressed as in Equation 2 below.

Figure 112008074149243-PAT00009

Here, β R + L represents the phase of the voltage across the resistor 20 and the inductor 40, β R represents the phase of the voltage across the resistor 20, X L represents the reactance of the inductor, and ω represents each frequency.

Applying a constant voltage in Equation 2, measuring the phase angle error while varying the resistance 20 and fitting to the linear function of the inverse 1 / R of the resistance 20, the slope becomes ωL, so the value of L You can get it.

<Absolute Evaluation Method of Capacitors and Inductors Using Voltage Transformer Comparator>

(Absolute Evaluation Method of Capacitors)

4 is a flowchart illustrating an absolute evaluation method of a capacitor and an inductor using the voltage transformer comparator according to the present invention. As shown in FIG. 4, first, a resistor 20, which is a first element, and a capacitor 30, which is a second element, are connected in series so that an alternating voltage is applied from an alternating voltage source 10. Then, connects the X terminal 110 and the N terminal 120 of the voltage transformer comparator 100 to point a and point b, respectively (S100).

Next, an AC voltage is applied to the resistor 20 and the capacitor 30 (S200).

Next, the phase angle error is repeated while randomly selecting the value of the resistor 20 connected in series with the capacitor 30 in the range of about 1/1000 to 1/100 of the capacitor 30 while changing the resistor 20. Measure (S300). The phase angle error is obtained by measuring the phase angle error calculated by the above-described Equation 1 and fitting it as a linear function of the resistor 20 to obtain a slope value.

Next, the capacitor value is obtained from the average slope value of the value calculated by repeated measurement (S400).

Finally, the validity is verified by analyzing the uncertainty of the absolute evaluation of the capacitor 30 using the voltage transformer comparator 100 (S500). Factors affecting the uncertainty of the capacitor 30 absolute evaluation using the voltage transformer comparator 100 include the standard uncertainty (u A ) by repeated measurement, the standard uncertainty (u B1 ) by fitting the equation, and the series resistance measurement. Standard uncertainty (u B2 ), standard uncertainty (u B3 ) due to direct-to-AC conversion error, standard uncertainty (u B4 ) by approximation of equation, and standard uncertainty (u B5 ) of voltage transformer comparator 100. . Therefore, the method of evaluating the uncertainty is preferably to include at least any one of these uncertainty factors. The standard uncertainty u A by repeated measurement among the aforementioned uncertainty factors can be obtained by using Equation 3 below.

Figure 112008074149243-PAT00010

here

Figure 112008074149243-PAT00011
Are the respective measurements,
Figure 112008074149243-PAT00012
Is the average value of the measured values, and n represents the number of measurements.

Relative uncertainty (U) is obtained by multiplying the relative composite standard uncertainty by the inclusion factor according to the validity of the measure and confidence level. Since the inclusion factor k is 2, the relative expansion uncertainty U is expressed by Equation 4 below.

Figure 112008074149243-PAT00013

(Absolute evaluation method of inductor)

4 is a flowchart illustrating an absolute evaluation method of a capacitor and an inductor using the voltage transformer comparator according to the present invention.

As shown in FIG. 4, first, an inductor 40, which is a first element, and a resistor 20, which is a second element, are connected in series so that an alternating voltage is applied from an alternating voltage source 10. Then, connects the X terminal 110 and the N terminal 120 of the voltage transformer comparator 100 at points c and d, respectively (S100).

Next, an AC voltage is applied to the inductor 40 and the resistor 20 (S200).

Next, the value of the resistor 20 connected in series with the inductor 40 is arbitrarily selected in the range of about 100 to 1000 of the inductor 40, and the phase angle error is repeatedly measured while changing the resistor 20 (S300). ). The phase angle error is obtained by measuring the phase angle error calculated by the above Equation 2 and fitting it as a linear function of the inverse of the resistor 20 to obtain a slope value.

Next, the inductor value is obtained from the average slope value of the value calculated by repeated measurement (S400).

Finally, the validity is verified by analyzing the uncertainty of the absolute evaluation of the inductor 40 using the voltage transformer comparator 100 (S500). Factors affecting the uncertainty of the absolute evaluation of the inductor 40 using the voltage transformer comparator 100 include the standard uncertainty (u A ) by repeated measurement, the standard uncertainty (u B1 ) by fitting the equation, and the series resistance measurement. Standard uncertainty (u B2 ), standard uncertainty (u B3 ) due to direct-to-AC conversion error, standard uncertainty (u B4 ) by approximation of equation, and standard uncertainty (u B5 ) of voltage transformer comparator 100. . Therefore, the method of evaluating the uncertainty is preferably to include at least any one of these uncertainty factors. The standard uncertainty u A by repeated measurement among the aforementioned uncertainty factors may be obtained by using Equation 3 described above.

Relative uncertainty (U) is obtained by multiplying the relative composite standard uncertainty by the inclusion factor according to the validity of the measure and confidence level. Here, since the inclusion factor k is 2, the relative expansion uncertainty U is the same as Equation 4 described above.

<Example>

(Measurement of capacitors)

1A is a block diagram of an absolute capacitor evaluation system using a voltage transformer comparator according to the present invention. The voltage transformer comparator 100 used in the absolute evaluation of the capacitor 30 using the voltage transformer comparator 100 according to the present invention used a comparator 100 having an accuracy of 0.003% of Tettex, and the inside of the X terminal 110 side. The resistance is r X, and the internal resistance of the N terminal 120 side is r N. The resistance 20 has a phase angle error of 0.01% or less, that is,

Figure 112008074149243-PAT00014
Vishay's resistor 20 was used. The capacitor 30 to be used used a ceramic capacitor 30 of IMM of Russia having a rated value of 100 nF, 200 nF, 300 nF, 500 nF, 1 μF, 2 μF, and 5 μF.

The value of the resistor 20 connected in series is arbitrarily selected in the range of about 1/1000 to 1/100 of the capacitor 30, and the phase angle error is determined by the above-described Equation 1 while changing the resistor 20. It measured (S300).

FIG. 5 is a graph showing the measurement and fitting results of the phase angle error in the voltage transformer comparator 100 according to the change in the resistance value of the series resistance when the capacitor 30 is rated 500 nF. As shown in FIG. 5, the slope is obtained by fitting a phase angle error with respect to a resistance value when the capacitor 30 is 500 nF, and is 189.09 × 10 −6 . In this manner, the inclination value of the capacitor value in the range of 100 nF to 5000 nF was repeatedly measured four times, and the capacitor value calculated using the measured slope is shown in the following [Table 1] (S400).

Figure 112008074149243-PAT00015

The uncertainty factor of the evaluation of the capacitor 30 using the voltage transformer comparator 100 is summarized using Equation 3 and Equation 4 shown in Table 2 below (S500).

Figure 112008074149243-PAT00016

As shown in Table 2, the relative expansion uncertainty of the capacitor 30 measured using the voltage transformer is 1.01% to 1.04%.

Results of measuring the capacitor 30 using the voltage transformer comparator 100 and using the bridge of the capacitor 30 at the Russian IMM company for the same measured capacitor 30, and the measurement result according to the present invention. Is shown in the following [Table 3].

Figure 112008074149243-PAT00017

The relative error of each measured value shown in the above [Table 3] is a value calculated by the following [Equation 5].

Figure 112008074149243-PAT00018

The relative error value of the capacitor 30 measurement using the voltage transformer comparator 100 was + 0.12% to + 0.62%, and the relative error value of the capacitor 30 measurement using the capacitor 30 bridge was -0.037% to + 0.004%.

6 shows a graph comparing the relative error value and the uncertainty of the capacitor measurement using the voltage transformer comparator and the capacitor measurement using the capacitor bridge according to the present invention. As shown in FIG. 6, although the measurement method using the voltage transformer comparator 100 has a greater uncertainty than the measurement method using the capacitor 30 bridge, the measurement results are consistent with each other. In addition, it is possible to apply this measurement technology because it has the advantage of being able to evaluate the absolute voltage and apply voltage up to the rated voltage.

(Inductor measurement)

Figure 1b is a block diagram of an absolute inductor evaluation system using a voltage transformer comparator according to the present invention. The resistance 20 according to the present invention has a phase angle error of 0.01% or less, that is,

Figure 112008074149243-PAT00019
Vishay's resistor 20 was used. The inductor 40 to be measured used a decade inductor 40 of General Radio (GR), whose rated values were 0.1 mH, 1 mH, 10 mH, 100 mH, and 1H.

As shown in FIG. 1B, an internal impedance r N of the series connected resistor 20 and the voltage transformer comparator 100 are connected in parallel, and an internal resistance of the inductor 40 is connected in series. Therefore, the size of the resistor 20 connected in series with the actual inductor 40 is represented by the sum of the series resistance and the parallel resistance (R T ) of the internal impedance of the voltage transformer comparator 100 and the internal resistance of the inductor 40. Losing phase angle error

Figure 112008074149243-PAT00020
Is shown in Equation 6 below.

Figure 112008074149243-PAT00021

Here, R is the resistance, R T is the parallel composite resistance of the internal impedance of the voltage transformer comparator 100, R L is the internal resistance of the inductor 40.

In this case, the magnitude of the internal impedance r N of the voltage transformer comparator 100 is 13 kΩ.

The value of the resistors 20 connected in series was arbitrarily selected in the range of about 100 to 1000 times the inductor 40, and the phase angle error was measured while changing the resistance value.

7 is a case in which the inductor is 10mH

Figure 112008074149243-PAT00022
The graph which shows the measurement result of phase angle error with respect to is shown. As shown in FIG. 7, when the inductor 40 is 10 mH,
Figure 112008074149243-PAT00023
The slope obtained by fitting the phase angle error to is 3.77844. In this manner, the inclination value of the 0.1 mH to 1000 mH inductor value was repeated four times to represent the average value, and the inductor value calculated using the measured inclination is shown in the following [Table 4] (S400).

Figure 112008074149243-PAT00024

The uncertainty factor of the evaluation of the inductor 40 using the voltage transformer comparator 100 is summarized using Equation 3 and Equation 4 shown in Table 5 below (S500).

Figure 112008074149243-PAT00025

As shown in Table 5, the relative expansion uncertainty for the measured value of the inductor 40 using the voltage transformer is 1.01% to 1.90%.

In order to validate the measurement technique of the inductor 40 using the voltage transformer comparator 100, the results of the measurement using the LCR meter (Fluke PM6306) and the measurement results of the present invention for the same measured inductor 40 are as follows. Table 6].

Figure 112008074149243-PAT00026

The relative error value of the inductor 40 measurement using the voltage transformer comparator 100 was -0.58% to + 1.26%, and the relative error value of the inductor 40 measurement using the LCR meter was -1.30% to + 0.13%. It was.

8 is a graph showing a comparison result of an inductor measurement value using a voltage transformer comparator and an LCR meter according to the present invention. As shown in FIG. 8, although the measurement method using the voltage transformer comparator 100 has a greater uncertainty than the measurement method using an LCR meter, the measurement results coincide within each other's uncertainty. And unlike the LCR meter has the advantage that the voltage can be applied up to the rated voltage of the target sample is applicable to the evaluation method according to the present invention.

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be interpreted.

1 is a block diagram of an absolute evaluation system of a capacitor and an inductor using a voltage transformer comparator according to the present invention;

2 is an equivalent circuit and voltage vector diagram for capacitor evaluation;

3 is an equivalent circuit and voltage vector diagram for inductor evaluation;

4 is a flowchart illustrating an absolute evaluation method of a capacitor and an inductor using the voltage transformer comparator according to the present invention;

5 is a graph illustrating measurement and fitting results of phase angle errors in a voltage transformer comparator according to a change in resistance value of a series resistor when a capacitor is rated at 500 nF.

6 is a graph comparing the relative error value and the uncertainty of the capacitor measurement value using the voltage transformer comparator and the capacitor measurement value using the capacitor bridge according to the present invention;

7 is a case in which the inductor is 10mH

Figure 112008074149243-PAT00030
A graph showing the measurement result of the phase angle error with respect to

8 is a graph illustrating a comparison result of an inductor measured value using a voltage transformer comparator and an LCR meter according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: AC voltage source 20: resistance

30: capacitor 40: inductor

100: voltage transformer comparator 110: X terminal

120: N terminal

a: point a (any point between the AC voltage source and the resistor)

b: point b (any point between resistor and capacitor)

c: c point (any point between the AC voltage source and the inductor)

d: d point (any point between inductor and resistor)

Claims (15)

In the absolute evaluation device of the capacitor 30 and the inductor 40 using the voltage transformer comparator 100 having the N terminal 120 and the X terminal 110, An AC voltage source 10 for applying an AC voltage; And And a first element and a second element sequentially connected to the AC voltage source 10 in series. One of the first device and the second device is a resistor 20, and the other device is a capacitor 30 or an inductor 40, The first device is an absolute evaluation system of a capacitor and an inductor using a voltage transformer comparator, characterized in that electrically connected between the N terminal (120) and X terminal (110). The method of claim 1, The resistance 20 has a phase angle error
Figure 112008074149243-PAT00027
Absolute evaluation system of capacitor and inductor using voltage transformer comparator, characterized by using phosphorus resistor (X b : reactance, R b : resistance value). The method of claim 1, Wherein the first device is a resistor (20) and the second device is a capacitor (30). The method of claim 3, The resistor (20), which is the first element, is variable within a range of 1/1000 times to 1/100 times of the capacitor (30), the absolute evaluation system of the capacitor and inductor using a voltage transformer comparator. The method of claim 1, Wherein the first device is an inductor (40) and the second device is a resistor (20). The method of claim 5, The second element, the resistor (20) is variable in the range of 100 times to 1000 times the inductor 40, the absolute evaluation system of the capacitor and the inductor using a voltage transformer comparator. The method of claim 1, The AC voltage source 10 is an absolute evaluation system of a capacitor and an inductor using a voltage transformer comparator, characterized in that for applying an alternating voltage of 100V to 220V. In the absolute evaluation method of the capacitor 30 and the inductor 40 using the voltage transformer comparator 100 having the N terminal 120 and the X terminal 110, The first and second devices selected from the resistor 20, the inductor 40, or the capacitor 30 are connected in series so as to apply an AC voltage from the AC voltage source 10, and the comparator 100 of the voltage transformer A first step (S100) of connecting the N terminal 120 and the X terminal 110; A second step (S200) of applying an AC voltage to the resistor 20 and the inductor 40 or the capacitor 30; A third step (S300) of repeatedly measuring a phase angle error using the voltage transformer comparator (100) to calculate an average value of the slope; And And a fourth step (S500) of obtaining an inductor value or a capacitor value from an average slope, wherein the absolute evaluation method of the capacitor and the inductor using the voltage transformer comparator is performed. The method of claim 8, In the first step S100, the resistor 20 is connected between the N terminal 120 and the X terminal 110 as the first element, and the capacitor 30 is parallel with the internal resistance as the second element. Absolute evaluation method of a capacitor and an inductor using a voltage transformer comparator, characterized in that connected to. The method of claim 9, The resistor (20) is an absolute evaluation method of a capacitor and an inductor using a voltage transformer comparator, characterized in that the resistance (20) is variable in the range of 1/1000 times to 1/100 times of the capacitor (30). The method of claim 8, In the first step S100, the inductor 40 is connected between the N terminal 120 and the X terminal 110 as the first element, and the resistor 20 is parallel with the internal resistance as the second element. Absolute evaluation method of a capacitor and an inductor using a voltage transformer comparator, characterized in that connected to. The method of claim 11, The resistor (20) is an absolute evaluation method of a capacitor and an inductor using a voltage transformer comparator, characterized in that the resistance (20) is varied in the range of 100 to 1000 times the inductor (40). The method of claim 8, The third step is the following equation while varying the resistor 20 for the absolute evaluation of the capacitor 30
Figure 112008074149243-PAT00028
 Absolute evaluation method of the capacitor and inductor, characterized in that by measuring the phase angle error according to, and measuring the slope of the capacitor by fitting the measured phase angle error as a first-order function of the resistor 20. (β 1 : voltage transformer Phase angle error measured by the comparator, β R + C : phase of the voltage across the resistor and capacitor, β C : phase of the voltage across the capacitor, X C : reactance of the capacitor, ω: angular frequency [2πF]) The method of claim 8, The third step is the following equation while varying the resistor 20 for the absolute evaluation of the inductor 40
Figure 112008074149243-PAT00029
 Measure the inclination of the inductor 40 by measuring the phase angle error and fitting the measured phase angle error to the first-order function of the inverse of the resistor 20. Absolute Evaluation Method. (β 2 : Phase angle error measured by voltage transformer comparator, β R + L : phase of resistance and voltage across both inductors, β R : phase of voltage across resistance, X L : reactance of inductor, ω: angular frequency [2πF] ) The method of claim 8, The voltage transformer comparator further comprises a fifth step (S500) for validating by analyzing the uncertainty of the capacitor value or the inductor value measured through the first step (S100) to the fourth step (S400). Absolute evaluation method of capacitor and inductor used.
KR1020080105067A 2008-10-27 2008-10-27 Absolute evaluation system of capacitor and inductor using voltage transformer compartator and absolute evaluation method thereof KR20100046293A (en)

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