KR101355560B1 - System and method for evaluating interference conductor of multiconductor cable - Google Patents

Abstract

It is an object of the present invention to provide a system and method for evaluating inter-conductor interference of multi-core cables in which conductors having different characteristics and risks of mutual interference are measured and evaluated for inter-conductor interference characteristics of a multi-core cable combined in one cable. . To this end, the present invention provides a system for evaluating interference between conductors of a multi-core cable, comprising: an input unit for detecting a multi-core cable measurement result signal of a network analyzer and noise characteristic signals of an interference source and an interference conductor of a multi-core cable measured by a noise meter; Compensating the shielding efficiency according to the attenuation characteristic of the cable by comparing the signal obtained by frequency band conversion of the noise characteristic signal with the measurement result signal, and reflecting the shielding efficiency of the corrected cable to the noise characteristic signal of the detected interference source conductor. A correction / quantification unit for calculating and quantifying the influence of noise applied to the interfered conductor; A signal synthesizer configured to synthesize the quantized noise influence with an arbitrary interference signal to generate an interference waveform signal; And an evaluation unit for comparing the simulated interference waveform signal with a reference signal for evaluation of goodness-of-fit to determine suitability. Therefore, by minimizing the influence of the evaluator's technical knowledge and experience, it is possible to provide accurate inter-conductor interference measurement and results inside the cable, and to improve the reliability of the cable by objectively measuring the multi-core cable through the test.

Description

System and method for evaluating the interference between conductors of multi-core cables {SYSTEM AND METHOD FOR EVALUATING INTERFERENCE CONDUCTOR OF MULTICONDUCTOR CABLE}

The present invention relates to the inter-conductor interference evaluation of a multi-core cable, and more particularly, to measure and evaluate the inter-conductor interference characteristics of multi-core cables in which conductors having different characteristics and risk of mutual interference are combined in one cable. A system and method for inter- conductor interference evaluation of cables.

Multi-core cable refers to a cable having a number of two or more core wires collectively and is insulated from each other, and has many advantages in terms of economics because it is easier to install and manage compared to the use of a plurality of single-core cables.

Such a multi-core cable has a plurality of conductors in one jacket, there is a risk of causing interference between the conductors having different characteristics by installing the power supply and signal conductors together.

In addition, when a conductor having a risk of mutual interference is manufactured by being combined with a cable, the influence of interference on a conductor to be interfered with at the interference source is an important factor in determining the functional reliability of the cable.

There is no universally known method for evaluating the mutual interference of multicore cables, but in many cases the impedance between the conductors is measured with a network analyzer.

When the network analyzer is used, a signal for each band is generated in a conductor corresponding to an interference source, and at this time, a signal of an interference source is read, and since the signal from the interference source is transmitted through a certain attenuation, the frequency is transmitted. The difference between the signal applied to the interference source and the signal received at the interference source for each band is the attenuation characteristic in the frequency band.

In particular, when there is a shield between the interference source and the interference source, such attenuation characteristics become shielding efficiency.

In this case, the attenuation characteristics measured by the network analyzer are different from the load, power, and signal characteristics in actual application, and in many cases, correction is performed using the values obtained through measurement in the actual product.

However, such evaluation is performed by the evaluator's manual work, and the evaluation is performed through the evaluator's technical knowledge and experience, so that the evaluation is subject to the subjective judgment of the evaluator.

In order to solve this problem, the present invention provides a system and method for inter-conductor interference evaluation of multi-core cables for measuring and evaluating inter-conductor interference characteristics of multi-core cables in which conductors having different characteristics and risk of mutual interference are combined in one cable. The purpose is to provide.

In order to achieve the above object, the present invention provides a system for evaluating the interference between conductors of a multi-core cable, comprising measuring a multi-core cable measurement result signal of a network analyzer and a noise characteristic signal of an interference source and an interference conductor of a multi-core cable measured by a noise meter. An input unit for detecting; Compensating the shielding efficiency according to the attenuation characteristic of the cable by comparing the signal obtained by frequency band conversion of the noise characteristic signal with the measurement result signal, and reflecting the shielding efficiency of the corrected cable to the noise characteristic signal of the detected interference source conductor. A correction / quantification unit for calculating and quantifying the influence of noise applied to the interfered conductor; A signal synthesizing unit configured to synthesize the quantized noise influence with the interference signal to generate an interference waveform signal; And an evaluation unit for comparing the simulated interference waveform signal with a reference signal for evaluation of goodness-of-fit to determine suitability.

In addition, the correction and quantification unit according to the present invention includes a first conversion unit for converting the noise characteristic signals of the interference source and the interference target conductor into a frequency band; Compensating the shielding efficiency according to the attenuation characteristics of the cable by comparing the noise characteristic signal converted to the frequency band and the measurement result signal, and reflects the shielding efficiency of the corrected cable to the noise characteristic signal of the interference source conductor converted to the frequency band. A calculation unit for calculating and quantifying an influence degree of noise applied to an interference conductor for each frequency band; And a second converter converting an influence degree of the noise quantized for each frequency band into a time band.

In addition, the interference source conductor according to the present invention is characterized in that the power source line, the interference source conductor is a signal line.

The fitness signal for evaluating goodness of fit according to the present invention may be any one of a preset standard signal or a threshold signal input by the evaluator.

In addition, the present invention provides a method for evaluating the interference between conductors of a multi-core cable, comprising: a) detecting a multi-core cable measurement result signal of a network analyzer from an input unit, and noise characteristic signals of an interference source and an interference conductor of a multi-core cable measured by a noise measuring device; Doing; b) compensating for the shielding efficiency according to the attenuation characteristic of the cable by comparing the measurement result signal with the frequency band conversion signal of the noise characteristic signals of the interference source and the interference conductor detected in step a); Calculating and quantifying the influence of noise applied to the interference conductor by reflecting the shielding efficiency of the corrected cable to the detected noise characteristic signal of the interference source conductor; c) a simulation step in which the signal synthesis unit synthesizes the noise influence quantified in step b) with the interference signal to generate the interference waveform signal; And d) evaluating, by the evaluating unit, the interference waveform signal simulated in step c) with a reference signal for goodness-of-fit evaluation to determine suitability.

In addition, the step a) according to the present invention is characterized in that additionally receives the bandwidth of the noise meter, the power supply and load characteristic signals of the actual product through the input unit.

Further, in the step b) according to the present invention, the correction and quantification unit converts the noise characteristic signals of the interference source and the interfered conductor into a frequency band, and compares the noise characteristic signal converted into the frequency band and the measurement result signal. Correcting shielding efficiency according to attenuation characteristics of the cable; And calculating and quantifying the influence of noise applied to the interfering conductor for each frequency band by reflecting the shielding efficiency of the calibrated cable to the noise characteristic signal of the interfering conductor converted into the frequency band by the correction / quantization unit. And converting the influence of noise quantified by frequency band into a time band.

The present invention has the advantage of providing accurate measurement by minimizing the influence of the evaluator's technical knowledge and experience.

In addition, the present invention has the advantage of improving the reliability of the cable by the objective measurement of the multi-core cable through the test.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the configuration of an inter-conductor interference evaluation system of a multi-core cable according to the present invention.
FIG. 2 is a block diagram illustrating a signal synthesizing unit of the inter-conductor interference evaluation system of the multi-core cable of FIG. 1. FIG.
3 is a flowchart illustrating a process for evaluating inter-conductor interference of multi-core cables according to the present invention.
4 is a waveform diagram showing a measurement signal of a multi-core cable measured by a network analyzer.
5 is an exemplary diagram showing a noise influence diagram.
6 is an exemplary diagram simulating an interference waveform.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the inter-conductor interference evaluation system and method of the multi-core cable according to the present invention.

1 is a block diagram showing the configuration of the inter-conductor interference evaluation system of the multi-core cable according to the present invention, Figure 2 is a block diagram showing the configuration of the signal synthesis unit of the inter-conductor interference evaluation system of the multi-core cable of FIG.

As shown in Fig. 1 and Fig. 2, the inter-conductor interference evaluation system 100 of the multi-core cable according to the present invention includes an input unit 110, a correction / quantification unit 120, a signal synthesis unit 130, and an evaluation. It is configured to include a portion 140.

The input unit 110 outputs a signal of a multi-core cable measurement result of the network analyzer 10 and a noise characteristic signal of an interference source and an interference conductor of a multi-core cable measured by a noise measuring device 20 such as an oscilloscope. It detects and outputs from the analyzer 10 and the noise measuring device 20.

The multi-core cable includes a signal line for performing data communication with a power line to which power is supplied, the multi-core cable is protected by a shield, the power line is an interference source conductor, and the signal line is an interference source conductor.

In addition, the input unit 110, for example, from the user interface, such as an edit box (Edit Box) such as the bandwidth of the noise meter 20, the actual power and load characteristics signal of the actual product, the user set output signal level, etc. Detect and output.

The correction / quantification unit 120 compares the signal obtained by frequency band conversion of the noise characteristic signal output from the input unit 110 with the measurement result signal to correct shielding efficiency according to the attenuation characteristic of the cable, and detects the detected interference source. A noise converting signal reflects the shielding efficiency of the corrected cable and calculates and quantifies the influence of noise applied to the interfered conductor, comprising: a first converting unit 121, a calculating unit 122, It is comprised including the 2nd conversion part 123.

In addition, the shielding efficiency of the cable is corrected according to the comparison result of the noise characteristic signal measured by the noise measuring device 20, the power line and the signal line of the actual cable of the measurement result of the network analyzer 10, Shielding efficiency has a characteristic of decreasing through the calibration due to the impedance difference between the measurement of the network delimiter 10 and the actual interference source conductor.

The first converter 121 converts the noise characteristic signal of the interference conductor and the noise characteristic signal of the interference conductor into a frequency band through an FFT (Fast Fourier ratnsform).

The operation unit 122 compares the noise characteristic signal converted into the frequency band and the measurement result signal to correct shielding efficiency according to the attenuation characteristic of the cable, and corrects the cable to the noise characteristic signal of the interference source conductor converted into the frequency band. The degree of influence of noise applied to the interfered conductor is calculated and quantified for each frequency band by reflecting the shielding efficiency of the frequency band.

Attenuation is usually measured in dB per unit length and is a measure of how weak the signal flowing along the cable is when it is delivered to the desired location. It has excellent attenuation characteristics and has different attenuation characteristics according to the type and grade of cable.

In addition, the operation unit 122 reflects the bandwidth of the noise measuring device 20 received from the input unit 110, the power supply and load characteristic signals of the actual product, and the like to affect the interference to be quantified. The impact can be more specifically quantified.

The second converter 123 inversely converts the influence of noise quantized for each frequency band into noise in a time band and outputs the noise.

The signal synthesizing unit 130 performs a simulation of generating an interference waveform signal by combining the noise influence quantified by the correction / quantization unit 120 with the original signal (for example, a CAN communication signal).

The evaluation unit 140 compares the synthesized interference waveform signal with a reference signal for a goodness-of-fit evaluation to determine and display suitability. The evaluation unit 140 includes a display unit.

In addition, the evaluation unit 140 may display the output signals of the input unit 110, the correction / quantification unit 120, and the signal synthesizing unit 130.

The reference signal for fitness evaluation is a CAN communication recommended standard signal of the Society of Automotive Engineers (SAE), for example, to evaluate whether it satisfies within a certain error range compared to the signal level expressed in SAE J2284-3, Allow evaluation results to be displayed.

In addition, the evaluation unit 140 is based on an arbitrary output signal level input by the evaluator to the reference signal for fitness evaluation, the input threshold value expressed in the specification of the interference waveform signal synthesized with the noise in the output signal level condition Determining whether or not satisfies within a certain error range to evaluate the suitability, and the evaluation result is displayed.

3 is a flowchart illustrating a process of evaluating the interference between conductors of a multi-core cable according to the present invention.

An evaluation method of the inter-conductor interference evaluation system 100 of the multi-core cable will be described with reference to FIGS. 1 to 3.

The input unit 110 detects the measurement result signal of the multi-core cable using the network analyzer 10 as shown in FIG. 4 (S100), and the noise characteristic signal and the interference source of the interference source conductor of the multi-core cable using the noise meter 20. The noise characteristic signal of the conductor is detected (S110).

In addition, the input unit 110 detects a bandwidth, a power supply and load characteristic signal of a real product, a user set output signal level, and the like, from a user interface using an edit box.

When the noise characteristic signals of the interference source and the interference conductor are detected in steps S100 and S110, the correction / quantization unit 120 converts the detected noise characteristic signals of the interference source and the interference source to a frequency band signal. In operation S120, the shielding efficiency according to the attenuation characteristic of the cable is corrected by comparing the converted signal with the measurement result signal measured by the network analyzer 10.

The correction and quantification unit 120 reflects the shielding efficiency of the calibrated cable to the noise characteristic signal of the interference source conductor converted into the frequency band signal, and thus the influence of noise applied to the interference target conductor of the waveform for each frequency band. By calculating and digitizing, the influence degree of noise quantized for each frequency band is quantified, and the influence degree of noise quantified for each frequency band is inversely transformed into a time band (S130).

For example, as illustrated in FIG. 5, the noise influence degree quantified in step S130 is simulated by the signal synthesizing unit 130 combining the quantized noise influence with an original signal such as a CAN communication signal to generate an interference waveform signal. (S140).

In step S140, for example, the simulated interference waveform signal as shown in FIG. 6 evaluates whether the evaluation unit 140 satisfies within a predetermined error range compared with the reference signal for evaluation of fitness (S150). Allow evaluation results to be displayed.

The suitability evaluation reference signal is, for example, a CAN communication recommended standard signal of SAE, and is a signal level expressed in SAE J2284-3 or any output signal level input by the evaluator through the input unit 110.

In the output signal level condition, it is judged whether or not the interference waveform signal synthesized with the noise satisfies the input threshold value expressed in the specification within a certain error range, to evaluate suitability, and to display the evaluation result.

Therefore, by minimizing the influence of the evaluator's technical knowledge and experience, it is possible to provide accurate inter-conductor interference measurement and results inside the cable, and to improve the reliability of the cable through the objective measurement of the multi-core cable through the test.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. It can be understood that

In the course of the description of the embodiments of the present invention, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation, , Which may vary depending on the intentions or customs of the user, the operator, and the definitions of these terms should be based on the contents throughout this specification.

10 network analyzer 20 noise meter
100: evaluation system 110: input unit
120: correction and quantification unit 121: first conversion unit
122: calculation unit 123: second conversion unit
130: signal synthesis unit 140: evaluation unit

Claims (7)

As an inter-conductor interference evaluation system of multi-core cable,
An input unit 110 for detecting a multi-core cable measurement result signal of the network analyzer 10 and noise characteristic signals of an interference source and an interference conductor of the multi-core cable measured by the noise measuring device 20;
Compensating the shielding efficiency according to the attenuation characteristic of the cable by comparing the signal obtained by frequency band conversion of the noise characteristic signal with the measurement result signal, and reflecting the shielding efficiency of the corrected cable to the noise characteristic signal of the detected interference source conductor. A correction / quantification unit 120 for calculating and quantifying an influence degree of noise applied to the interference target conductor;
A signal synthesizing unit 130 for synthesizing the quantized noise influence with the interference signal to generate an interference waveform signal; And
And an evaluation unit (140) for comparing the simulated interference waveform signal with a reference signal for evaluation of fitness. The method of claim 1,
The correction / quantification unit 120 includes: a first conversion unit 121 for converting noise characteristic signals of the interference source and the interference target conductor into a frequency band;
Compensating the shielding efficiency according to the attenuation characteristics of the cable by comparing the noise characteristic signal converted to the frequency band and the measurement result signal, and reflects the shielding efficiency of the corrected cable to the noise characteristic signal of the interference source conductor converted to the frequency band. A calculation unit 122 that calculates and quantifies the influence of noise applied to the interfered conductor for each frequency band; And
And a second converter (123) for converting an influence degree of noise quantified for each frequency band into a time band. The method of claim 1,
And the interference source conductor is a power line, and the interference source conductor is a signal line. The method of claim 1,
The reference signal for goodness-of-fit evaluation is any one of a preset standard signal or a threshold signal input by the evaluator. As a method of evaluating the interference between conductors of a multi-core cable,
a) detecting a measurement result signal of the network analyzer 10 from the input unit 110 and noise characteristic signals of the interference source and the interference conductor of the multi-core cable measured by the noise measuring device 20;
b) The shielding efficiency according to the attenuation characteristics of the cable by comparing the signal obtained by the frequency band conversion of the noise characteristic signals of the interference source and the interference conductor detected in step a) with the measurement result signal. Calculating and quantifying the influence of noise applied to the interference target conductor by reflecting the shielding efficiency of the corrected cable to the detected noise characteristic signal of the interference source conductor;
c) a simulation step in which the signal synthesizing unit 130 generates the interference waveform signal by combining the noise influence quantified in the step b) with the interference signal; And
and d) evaluating, by the evaluator, the interfering waveform signal simulated in step c) with a reference signal for goodness-of-fit evaluation to determine suitability. The method of claim 5, wherein
Step a) is a method of evaluating the interference between the conductors of the multi-core cable, characterized in that additionally receives the input signal, the bandwidth of the noise measuring device 20, the actual power supply and load characteristic signals. The method according to claim 5 or 6,
b-1) In the step b), the correction / quantization unit 120 converts the noise characteristic signals of the interference source and the interfered conductor into a frequency band, and converts the noise characteristic signal and the measurement result signal into the frequency band. Compensating the shielding efficiency according to the attenuation characteristics of the cable by comparing the; And
b-2) The frequency band of the correction and quantization unit 120 reflects the shielding efficiency of the calibrated cable to the noise characteristic signal of the interference source conductor converted into the frequency band to reflect the influence of noise applied to the interference conductor. And quantifying and quantifying each signal and converting the influence of noise quantified by the frequency band into a time band.

Images