Risk identification and control system applied to conducted disturbance test

Abstract

The invention discloses a risk identification and control system applied to a conducted disturbance test, and relates to the technical field of conducted disturbance tests, and the system comprises a disturbance risk identification module which is used for carrying out the harassment risk identification of a tested product, and carrying out the comprehensive analysis of an identification result; and the harassment control module receives the comprehensive analysis result transmitted by the harassment risk identification module, calculates a corresponding filtering parameter according to the comprehensive analysis result, controls parameters in an adjustable resistor, inductor and capacitor combination box, and then performs a loop test until the transmission harassment risk is removed. According to the invention, the electromagnetic disturbance analysis is carried out on the product at the sample stage of the product by adopting the radiation induction probe and the conduction induction probe, so that the accuracy of disturbance risk identification is improved; after the conduction electromagnetic disturbance risk is identified, a response filter circuit can be designed through an adjustable resistor, an inductor and a capacitor combination box, and the conduction disturbance problem is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field, and in particular relates to a risk identification and control system applied to conducted disturbance testing. Background Art

[0002] In the research and development and production process of electronic products, conducted interference testing is an important test item used to evaluate the electromagnetic interference generated by electronic products to the outside world during normal operation.

[0003] However, there are some shortcomings in the current conducted disturbance test process: 1. The existing technology can only test the conducted electromagnetic disturbance of finished products, and the method of risk identification of disturbance test is single, which reduces the accuracy of risk identification; 2. Existing technologies cannot provide corresponding control measures after identifying electromagnetic compatibility risks, and thus cannot ensure that products pass conducted interference tests.

[0004] Based on this, we propose a risk identification and control system for conducted disturbance testing. Summary of the invention

[0005] The purpose of the present invention is to provide a risk identification and control system for conducted disturbance testing in order to address the problems of reduced accuracy of risk identification in the existing conducted disturbance testing process and failure to provide corresponding control measures after identifying electromagnetic compatibility risks.

[0006] The present invention is implemented through the following technical solutions: a risk identification and control system applied to conducted disturbance testing, comprising: A disturbance risk identification module, which is used to identify the disturbance risk of the tested product and to conduct a comprehensive analysis of the identification results to determine the overall disturbance risk level of the tested product; The disturbance control module is connected to the disturbance risk identification module, receives the comprehensive analysis result transmitted by the disturbance risk identification module, calculates the corresponding filtering parameters according to the comprehensive analysis result, and controls the parameters in the adjustable resistor, inductor and capacitor combination box, and then performs a cyclic test until the transmission disturbance risk is eliminated; adjusts the design of the tested product according to the final parameters of the adjustable resistor, inductor and capacitor combination box to ensure that it passes the conducted disturbance test.

[0007] Preferably, the interference risk identification module includes a radiation sensing probe, a conduction sensing probe and a signal analyzer, and the radiation sensing probe and the conduction sensing probe are both connected to the signal analyzer; The radiation sensing probe is used to identify the radiation disturbance risk of the product under test and analyze whether there is a radiation disturbance risk; The conductive sensing probe is used to identify the conductive interference risk of the tested product and analyze whether there is a conductive interference risk.

[0008] Preferably, the method for identifying radiation disturbance risk includes: Use a radiation sensing probe to measure the radiation field strength of the product under test at different distances and angles; you can choose to measure under far-field or near-field conditions, and determine the measurement distance and angle based on the radiation characteristics of the product under test and the requirements of the test standard.

[0009] Connect the radiation sensing probe to the signal analyzer, set the appropriate frequency range and resolution bandwidth, and record the radiation field strength values ​​of the tested product at different frequencies; Analyze the radiation field strength measurement results to determine whether the product under test has a radiation interference risk; if the radiation field strength exceeds the limit specified in the test standard, it means that the product under test has a radiation interference risk.

[0010] Preferably, the method for identifying the risk of conducted disturbance includes: Conduction voltage measurement: Use a conductive sensing probe to measure the conductive voltage on the power line, signal line and other conductors of the product under test; Connect the conductive induction probe to the information analyzer, set appropriate measurement parameters, and record the conductive voltage values ​​of the tested product at different frequencies; Analyze the conducted voltage measurement results to determine whether the product under test has a conducted disturbance risk; if the conducted voltage exceeds the limit specified in the test standard, it means that the product under test has a conducted disturbance risk; Conduction current measurement: Use a current probe to measure the conduction current of the power line, signal line and other conductors of the product under test; Compare the measured conduction current value with the limit value specified in the test standard to determine whether the product under test has a conduction disturbance risk; if the conduction current exceeds the limit value, it means that the product under test has a conduction disturbance risk; Analyze the conducted current measurement results and determine the conducted disturbance source of the product under test; Conduction impedance measurement: Use an impedance analyzer to measure the conduction impedance of the power lines, signal lines and other conductors of the product under test; Based on the conducted impedance measurement results, determine the conducted disturbance path of the product under test; for example, if the impedance of the conductor changes at a certain frequency, there may be a conducted disturbance path at this frequency.

[0011] Take appropriate corrective measures to reduce the risk of conducted interference of the tested product. For example, conducted interference can be reduced by adding filters, improving grounding, optimizing wiring, etc.

[0012] Preferably, the interference control module includes a controller and an adjustable resistor, inductor and capacitor combination box, one end of the controller is connected to the signal analyzer, and the other end is connected to the adjustable resistor, inductor and capacitor combination box; the adjustable resistor, inductor and capacitor combination box is in the test circuit, which is convenient for circuit debugging and performance testing.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The present invention uses radiation sensing probes and conductive sensing probes to perform electromagnetic disturbance analysis on products at the product sample stage, thereby increasing the accuracy of disturbance risk identification.

[0014] 2. After identifying the risk of conducted electromagnetic interference, a corresponding filter circuit can be designed through an adjustable resistor, inductor and capacitor combination box to solve the conducted interference problem and ensure that it passes the conducted interference test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The block diagram of a risk identification and control system applied to conducted disturbance testing is shown in FIG. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] For examples, see Figure 1 , a risk identification and control system for conducted disturbance testing, comprising: A disturbance risk identification module, which is used to identify the disturbance risk of the tested product and to conduct a comprehensive analysis of the identification results to determine the overall disturbance risk level of the tested product; The disturbance control module is connected to the disturbance risk identification module, receives the comprehensive analysis result transmitted by the disturbance risk identification module, calculates the corresponding filtering parameters according to the comprehensive analysis result, and controls the parameters in the adjustable resistor, inductor and capacitor combination box, and then performs a cyclic test until the transmission disturbance risk is eliminated; adjusts the design of the tested product according to the final parameters of the adjustable resistor, inductor and capacitor combination box to ensure that it passes the conducted disturbance test.

[0018] The interference risk identification module includes a radiation sensing probe, a conduction sensing probe and a signal analyzer, and the radiation sensing probe and the conduction sensing probe are both connected to the signal analyzer; The radiation sensing probe is used to identify the radiation disturbance risk of the product under test and analyze whether there is a radiation disturbance risk; The conductive sensing probe is used to identify the conductive interference risk of the tested product and analyze whether there is a conductive interference risk.

[0019] Among them, the interference control module includes a controller and an adjustable resistor, inductor and capacitor combination box. One end of the controller is connected to the signal analyzer, and the other end is connected to the adjustable resistor, inductor and capacitor combination box; the adjustable resistor, inductor and capacitor combination box is in the test circuit, which is convenient for circuit debugging and performance testing.

[0020] In one specific embodiment, the method for identifying radiation disturbance risk includes: Use a radiation sensing probe to measure the radiation field strength of the product under test at different distances and angles; you can choose to measure under far-field or near-field conditions, and determine the measurement distance and angle based on the radiation characteristics of the product under test and the requirements of the test standard.

[0021] Connect the radiation sensing probe to the signal analyzer, set the appropriate frequency range and resolution bandwidth, and record the radiation field strength values ​​of the tested product at different frequencies; Analyze the radiation field strength measurement results to determine whether the product under test has a radiation interference risk; if the radiation field strength exceeds the limit specified in the test standard, it means that the product under test has a radiation interference risk.

[0022] Perform spectrum analysis on the radiation field strength measurement results to determine the radiation spectrum characteristics of the product under test. The spectrum analysis function of the spectrum analyzer can be used to observe the frequency distribution, bandwidth, peak value and other parameters of the radiation signal.

[0023] Analyze the radiation spectrum characteristics to determine the radiation interference source of the product under test. For example, if there is a peak of a specific frequency in the radiation spectrum, it may be the radiation interference generated by a circuit or component in the product under test.

[0024] According to the analysis results of the radiation interference source, take corresponding corrective measures to reduce the radiation interference risk of the tested product.

[0025] In one specific embodiment, the method for identifying the risk of conducted disturbance includes: 1) Conduction voltage measurement: Use a conductive sensing probe to measure the conducted voltage on the power line, signal line and other conductors of the product under test. You can choose to measure at different positions and load conditions, and determine the measurement position and load according to the conductive characteristics of the product under test and the requirements of the test standard.

[0026] Connect the conductive induction probe to the information analyzer, set appropriate measurement parameters, and record the conductive voltage values ​​of the tested product at different frequencies; Analyze the conducted voltage measurement results to determine whether the product under test has a conducted disturbance risk; if the conducted voltage exceeds the limit specified in the test standard, it means that the product under test has a conducted disturbance risk; 2) Conduction current measurement: Use current probes to measure the conducted current of conductors such as power lines and signal lines of the product under test. Current probes can be used to perform measurements at different positions and under different load conditions.

[0027] Compare the measured conduction current value with the limit value specified in the test standard to determine whether the product under test has a conduction disturbance risk; if the conduction current exceeds the limit value, it means that the product under test has a conduction disturbance risk; Analyze the conducted current measurement results to determine the source of conducted disturbance of the product under test; for example, if the conducted current has a peak at a certain frequency, it may be the conducted disturbance generated by a circuit or component in the product under test.

[0028] 3) Conduction impedance measurement: Use an impedance analyzer to measure the conduction impedance of the power lines, signal lines and other conductors of the tested product; it can measure the resistance, inductance, capacitance and other parameters of the conductor and analyze the impedance characteristics of the conductor.

[0029] Based on the conducted impedance measurement results, determine the conducted disturbance path of the product under test; for example, if the impedance of the conductor changes at a certain frequency, there may be a conducted disturbance path at this frequency.

[0030] Take appropriate corrective measures to reduce the risk of conducted interference of the tested product. For example, conducted interference can be reduced by adding filters, improving grounding, optimizing wiring, etc.

[0031] In one specific embodiment, the adjustable resistor, inductor and capacitor combination box includes an adjustable resistor, an inductor and a capacitor.

[0032] An adjustable resistor is an electronic component that can change the resistance value. In a combination box, it is usually in the form of a potentiometer or a rheostat, and the resistance value is changed by rotating a knob or sliding a slider. The function of an adjustable resistor is to adjust the current and voltage in the circuit, and control the circuit's gain, attenuation, frequency response and other characteristics.

[0033] Inductor is an electronic component that can store magnetic field energy. In the combination box, it is usually in the form of a coil, and the inductance value can be changed by changing the number of turns, diameter and length of the coil. The role of the inductor is to generate a magnetic field in the circuit, hinder the change of current, and play a role in filtering, energy storage and oscillation.

[0034] Capacitors are electronic components that can store electric field energy. In combination boxes, capacitors are usually used, and the capacitance value can be changed by changing parameters such as the plate area, plate spacing, and dielectric material of the capacitor. The function of the capacitor is to store charge in the circuit, hinder the change of voltage, and play a role in filtering, coupling, and bypassing.

[0035] The working process and beneficial effects of the present invention are as follows: The present invention uses radiation sensing probes and conduction sensing probes to perform electromagnetic interference analysis on products at the product sample stage, thereby increasing the accuracy of interference risk identification. First, the interference risk of the tested product is identified by the radiation sensing probe and the conduction sensing probe, and the interference signal is sensed by the sensing probe and then transmitted to the controller through the signal analyzer. The controller compares the sensed interference data with the interference limit in the database. When a risk is found, the controller calculates the corresponding filtering parameters according to the spectrum characteristics of the interference, and controls the parameters in the adjustable resistor, inductor and capacitor combination box, and then performs a cyclic test until the transmission interference risk is eliminated. At this time, the design of the tested product is adjusted according to the parameters of the final adjustable resistor, inductor and capacitor combination box to ensure that it passes the conduction interference test.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A risk identification and control system for conducted disturbance testing, characterized in that: include: A disturbance risk identification module, which is used to identify the disturbance risk of the tested product and to conduct a comprehensive analysis of the identification results to determine the overall disturbance risk level of the tested product; A disturbance control module, which is connected to the disturbance risk identification module, receives the comprehensive analysis result transmitted by the disturbance risk identification module, calculates the corresponding filtering parameters according to the comprehensive analysis result, and controls the parameters in the adjustable resistor, inductor and capacitor combination box, and then performs a cyclic test until the transmission disturbance risk is eliminated; Adjust the design of the product under test according to the parameters of the final adjustable resistor, inductor and capacitor combination box to ensure that it passes the conducted interference test.

2. A risk identification and control system for conducted disturbance testing according to claim 1, characterized in that: The interference risk identification module includes a radiation sensing probe, a conduction sensing probe and a signal analyzer, and the radiation sensing probe and the conduction sensing probe are both connected to the signal analyzer; The radiation sensing probe is used to identify the radiation disturbance risk of the product under test and analyze whether there is a radiation disturbance risk; The conductive sensing probe is used to identify the conductive interference risk of the tested product and analyze whether there is a conductive interference risk.

3. A risk identification and control system for conducted disturbance testing according to claim 2, characterized in that: The method for identifying radiation disturbance risk comprises: Use radiation sensing probe to measure the radiation field strength of the product under test at different distances and angles; Connect the radiation sensing probe to the signal analyzer, set the appropriate frequency range and resolution bandwidth, and record the radiation field strength values ​​of the tested product at different frequencies; Analyze the radiation field strength measurement results to determine whether the product under test has a radiation interference risk; if the radiation field strength exceeds the limit specified in the test standard, it means that the product under test has a radiation interference risk.

4. A risk identification and control system for conducted disturbance testing according to claim 2, characterized in that: The method for identifying the risk of conducted disturbances comprises: 1) Conduction voltage measurement: Use a conductive sensing probe to measure the conductive voltage on the power line, signal line and other conductors of the product under test; Connect the conductive induction probe to the information analyzer, set appropriate measurement parameters, and record the conductive voltage values ​​of the tested product at different frequencies; Analyze the conducted voltage measurement results to determine whether the product under test has a conducted disturbance risk; if the conducted voltage exceeds the limit specified in the test standard, it means that the product under test has a conducted disturbance risk; 2) Conduction current measurement: Use a current probe to measure the conduction current of the power line, signal line and other conductors of the product under test; Compare the measured conduction current value with the limit value specified in the test standard to determine whether the product under test has a conduction disturbance risk; if the conduction current exceeds the limit value, it means that the product under test has a conduction disturbance risk; Analyze the conducted current measurement results and determine the conducted disturbance source of the product under test; 3) Conduction impedance measurement: Use an impedance analyzer to measure the conduction impedance of the power lines, signal lines and other conductors of the product under test; According to the results of the conducted impedance measurement, the conducted disturbance path of the product under test can be determined; if the impedance of the conductor changes at a certain frequency, there may be a conducted disturbance path at that frequency.

5. The risk identification and control system for conducted disturbance testing according to claim 2, characterized in that: The disturbance control module includes a controller and an adjustable resistor, inductor and capacitor combination box, one end of the controller is connected to the signal analyzer, and the other end is connected to the adjustable resistor, inductor and capacitor combination box; The adjustable resistor, inductor and capacitor combination box is convenient for circuit debugging and performance testing in the test circuit.

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