CN113834995A - Test system for simultaneously detecting electromagnetic interference at low frequency and high frequency - Google Patents
Test system for simultaneously detecting electromagnetic interference at low frequency and high frequency Download PDFInfo
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Abstract
The invention discloses a test system for simultaneously detecting electromagnetic interference at low frequency and high frequency, which relates to the technical field of electromagnetic interference test.
Description
Technical Field
The invention relates to the technical field of electromagnetic interference testing, in particular to a testing system for simultaneously detecting electromagnetic interference at low frequency and high frequency.
Background
Along with the development of computers, program control instruments and digital signal processing, the electromagnetic compatibility automatic testing technology is remarkably developed, so that the efficiency and the precision of electromagnetic compatibility testing work are greatly improved. However, because of the numerous instruments and the complexity of the electromagnetic compatibility test project, the obtained test data usually needs to be further processed to meet the requirements of the actual test project. Therefore, the development of related automatic test software for specific test projects, the further analysis and processing of test data and the addition of the test data into the automatic test software become important directions of the electromagnetic compatibility test work at the present stage; the prior art detects the high frequency interference signal and the low frequency interference signal that equipment sent usually when detecting interference signal simultaneously, and when detecting simultaneously, because high frequency signal intensity is high, when the collection equipment of high frequency interference signal was too close to the collection equipment of low frequency interference signal, the high frequency interference signal that equipment sent by being detected can influence the receipt of low frequency interference signal, if can not obtain the critical value that produces mutual interference between low frequency signal collection equipment and the high frequency signal collection equipment, then the low frequency interference signal of equipment under being detected in the testing process detects the precision and easily receives the influence.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a test system for simultaneously detecting electromagnetic interference at low frequency and high frequency, which comprises a darkroom, a device to be tested and a detection system, wherein the device to be tested and the detection system are arranged in the darkroom, the detection system is used for detecting a high-frequency interference signal and a low-frequency interference signal sent by the device to be tested and comprises a low-frequency module, a high-frequency module and a frequency mutual interference calculation module, the low-frequency module comprises a low-frequency antenna, a first filter bank, a first controller, a first ranging module and a low-frequency execution module, the high-frequency module comprises a high-frequency antenna, a second filter bank, a second controller, a second ranging module and a high-frequency execution module, the low-frequency antenna, the first filter bank and the first controller are sequentially connected, the high-frequency antenna, the second filter bank and the second controller are sequentially connected, the first ranging module is used for detecting the distance between the receiving end of the low-frequency antenna and the device to be tested, the second ranging module is used for detecting the distance between the receiving end of the high-frequency antenna and the tested equipment;
the low frequency execution module is connected with the first controller, the low frequency execution module is used for adjusting the distance between the low frequency antenna and the tested device, the high frequency execution module is connected with the second controller, the high frequency execution module is used for adjusting the distance between the high frequency antenna and the tested device, the mutual interference calculation module of frequency is used for calculating the mutual interference distance between the low frequency antenna and the high frequency antenna, and the mutual interference distance is the critical distance for generating mutual interference between the low frequency antenna and the high frequency antenna.
Preferably, still include low frequency test system and high frequency test system, low frequency test system includes that low frequency radio frequency change over switch, low frequency put in advance, low frequency antenna, low frequency radio frequency change over switch, low frequency put in advance, first filter bank connects gradually, high frequency test system includes that high frequency radio frequency change over switch, high frequency put in advance, high frequency antenna, high frequency radio frequency change over switch, high frequency put in advance, second filter bank connects gradually.
Preferably, the display device further comprises a first display module and a second display module, wherein the first display module is connected with the first controller, and the second display module is connected with the second controller.
Preferably, the noise filtering device further comprises a power supply module and a noise filtering module, wherein the power supply module is connected with the noise filtering module, the noise filtering module is connected with the first controller and the second controller, the noise filtering module comprises a signal amplifier and an active filter, the signal amplifier is coupled with the active filter, the signal amplifier is connected with the power supply module, and the active filter is connected with the first controller and the second controller.
Preferably, the darkroom further comprises a support platform, the tested equipment is placed on the support platform, and the vertical height of the table top of the support platform is equal to the vertical height of the receiving end of the high-frequency antenna and the vertical height of the receiving end of the low-frequency antenna.
In another aspect, a test method for simultaneously detecting electromagnetic interference at low and high frequencies is provided, which includes the following steps:
s1: placing the tested equipment on a support table, checking the frequency peak value of the low-frequency interference signal on a first display module, and checking the frequency peak value of the high-frequency interference signal on a second display module;
s2: controlling the low-frequency execution module to move, judging whether the frequency peak value in the first display module is changed, if so, entering step S4, otherwise, entering step S3;
s3: when the high-frequency antenna does not generate signal interference on the low-frequency antenna, reading frequency data on the first display module as a low-frequency interference value of the tested equipment, and reading frequency data on the second display module as a high-frequency interference value of the tested equipment;
s4: and the mutual interference distance between the high-frequency antenna and the low-frequency antenna is calculated through the frequency mutual interference module.
Preferably, the formula for calculating the mutual interference distance in step S4 is as follows:
in the formula (I), the compound is shown in the specification,
the mutual interference distance of the high-frequency interference signal and the low-frequency interference signal of the tested device,
the distance between the receiving end of the low frequency antenna and the device under test,
the distance between the receiving end of the high-frequency antenna and the tested equipment,
for the frequency peak on the first display module before the low frequency execution module moves,
the frequency peak on the first display module after performing the mode shift for low frequencies,
is the test voltage for the device under test,
subjecting a device under test to a test voltage
The value of the current at the time of the current,
is the wave impedance in the dark box during the test.
The invention has the beneficial effects that:
the method comprises the steps of adjusting the distances between the low-frequency antenna and the high-frequency antenna and the tested equipment, detecting the distance before adjustment and the distance after adjustment, and acquiring the frequency peak values of low-frequency interference signals detected by the low-frequency antenna before and after adjustment to obtain the mutual interference distance between the low-frequency signals and the high-frequency signals.
Drawings
FIG. 1 is a flow chart of a test method for simultaneously detecting electromagnetic interference at low and high frequencies;
fig. 2 shows a graph of the energy amplitude of an antenna channel element of a test system for simultaneous detection of electromagnetic interference for low and high frequencies.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to fig. 1-2 of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other implementations made by those of ordinary skill in the art based on the embodiments of the present invention are obtained without inventive efforts.
In the description of the present invention, it is to be understood that the terms "counterclockwise", "clockwise", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description only, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting.
The system comprises a darkroom, a detected device and a detection system, wherein the detected device and the detection system are arranged in the darkroom, the detected device is electrified, the detection system detects a high-frequency interference signal and a low-frequency interference signal sent by the detected device, the detection system comprises a low-frequency module, a high-frequency module and a frequency mutual interference calculation module, the low-frequency module comprises a low-frequency antenna, a first filter bank, a first controller, a first ranging module and a low-frequency execution module, the high-frequency module comprises a high-frequency antenna, a second filter bank, a second controller, a second ranging module and a high-frequency execution module, the low-frequency antenna, the first filter bank and the first controller are sequentially connected, the high-frequency antenna, the second filter bank and the second controller are sequentially connected, and the first ranging module is used for detecting the distance between the receiving end of the low-frequency antenna and the detected device, the second ranging module is used for detecting the distance between the receiving end of the high-frequency antenna and the tested equipment;
the low frequency execution module is connected with the first controller, the low frequency execution module is used for adjusting the distance between the low frequency antenna and the tested device, the high frequency execution module is connected with the second controller, the high frequency execution module is used for adjusting the distance between the high frequency antenna and the tested device, the mutual interference calculation module of frequency is used for calculating the mutual interference distance between the low frequency antenna and the high frequency antenna, and the mutual interference distance is the critical distance for generating mutual interference between the low frequency antenna and the high frequency antenna.
The low-frequency module and the high-frequency module are powered on simultaneously, before the high-frequency antenna and the low-frequency antenna are used, a vector grid analyzer is needed to test original errors of each antenna radiation unit, the high-frequency antenna and the low-frequency antenna are calibrated, after the calibration is completed, amplitude and phase compensation is performed according to the amplitude and phase error calculation of each radiation unit of the antenna, the tested equipment is powered on after the compensation is completed, a high-frequency interference signal and a low-frequency interference signal sent by the tested equipment are detected, a control processor controls a low-frequency execution module to drive the low-frequency antenna to move, a first ranging module detects the distance between the low-frequency antenna and the tested equipment, a second ranging module detects the distance between the high-frequency antenna and the tested equipment and transmits detection data to a control processor, and the control processor transmits the detection data to a frequency mutual interference calculation module, the mutual interference distance between the low-frequency antenna and the high-frequency antenna is calculated, after the mutual interference distance is obtained, the mutual interference distance is transmitted to the control processor, the control processor controls the low-frequency execution module again to drive the low-frequency antenna, the distance between the low-frequency antenna and the tested equipment reaches the mutual interference distance, and the high-frequency antenna is prevented from generating interference on the detection of the low-frequency antenna; when the low-frequency execution module drives the low-frequency antenna to move, the moving distance is linearly moved by taking the tested equipment as a reference point.
Specifically, still include low frequency test system and high frequency test system, low frequency test system includes that low frequency radio frequency change over switch, low frequency put in advance, low frequency antenna, low frequency radio frequency change over switch, low frequency put in advance, first filter bank connects gradually, high frequency test system includes that high frequency radio frequency change over switch, high frequency put in advance, high frequency antenna, high frequency radio frequency change over switch, high frequency put in advance, second filter bank connects gradually.
Specifically, the display device further comprises a first display module and a second display module, wherein the first display module is connected with the first controller, and the second display module is connected with the second controller.
Specifically, the power supply module is connected with the noise filtering module, the noise filtering module is connected with the first controller and the second controller, the noise filtering module comprises a signal amplifier and an active filter, the signal amplifier is coupled with the active filter, the signal amplifier is connected with the power supply module, and the active filter is connected with the first controller and the second controller.
Specifically, the darkroom is still including a supporting bench, the equipment that is surveyed is placed on the supporting bench, the vertical height of supporting bench mesa and the receiving terminal of high frequency antenna, the vertical height of the receiving terminal of low frequency antenna are levelled.
As shown in fig. 1, the test method for simultaneously detecting electromagnetic interference at low frequency and high frequency includes the following steps:
s1: placing the tested equipment on a support table, checking the frequency peak value of the low-frequency interference signal on a first display module, and checking the frequency peak value of the high-frequency interference signal on a second display module;
s2: controlling the low-frequency execution module to move, judging whether the frequency peak value in the first display module is changed, if so, entering step S4, otherwise, entering step S3;
s3: when the high-frequency antenna does not generate signal interference on the low-frequency antenna, reading frequency data on the first display module as a low-frequency interference value of the tested equipment, and reading frequency data on the second display module as a high-frequency interference value of the tested equipment;
s4: and the mutual interference distance between the high-frequency antenna and the low-frequency antenna is calculated through the frequency mutual interference module.
Specifically, the formula for calculating the mutual interference distance in step S4 is as follows:
in the formula (I), the compound is shown in the specification,
the mutual interference distance of the high-frequency interference signal and the low-frequency interference signal of the tested device,
the distance between the receiving end of the low frequency antenna and the device under test,
the distance between the receiving end of the high-frequency antenna and the tested equipment,
for the frequency peak on the first display module before the low frequency execution module moves,
the frequency peak on the first display module after performing the mode shift for low frequencies,
is the test voltage for the device under test,
subjecting a device under test to a test voltage
The value of the current at the time of the current,
is the wave impedance in the dark box during the test.
In actual operation, the energy amplitudes of 0-63 channel units of the antenna are collected, as shown in fig. 2, the difference between the amplitude of the channel unit of the antenna 58 and the amplitude energy of the channel unit of the antenna 42 is 7.0284dB, the energy amplitude value of the channel unit of the antenna is compensated according to the detection information, then the phase information collection is performed on the antenna of each channel unit of 0-63, and the phase is compensated in advance according to the collected information, so as to obtain more accurate frequency peak values before and after the movement of the low-frequency execution module, and thus the calculation of the mutual interference distance is more accurate.
Claims (7)
1. The system comprises a darkroom, detected equipment and a detection system, wherein the detected equipment and the detection system are arranged in the darkroom, the detected equipment is electrified, the detection system detects high-frequency interference signals and low-frequency interference signals sent by the detected equipment, and the system is characterized in that the detection system comprises a low-frequency module, a high-frequency module and a frequency mutual interference calculation module, the low-frequency module comprises a low-frequency antenna, a first filter bank, a first controller, a first ranging module and a low-frequency execution module, the high-frequency module comprises a high-frequency antenna, a second filter bank, a second controller, a second ranging module and a high-frequency execution module, the low-frequency antenna, the first filter bank and the first controller are sequentially connected, the high-frequency antenna, the second filter bank and the second controller are sequentially connected, and the first ranging module is used for detecting the distance between the receiving end of the low-frequency antenna and the detected equipment, the second ranging module is used for detecting the distance between the receiving end of the high-frequency antenna and the tested equipment;
the low frequency execution module is connected with the first controller, the low frequency execution module is used for adjusting the distance between the low frequency antenna and the tested device, the high frequency execution module is connected with the second controller, the high frequency execution module is used for adjusting the distance between the high frequency antenna and the tested device, the mutual interference calculation module of frequency is used for calculating the mutual interference distance between the low frequency antenna and the high frequency antenna, and the mutual interference distance is the critical distance for generating mutual interference between the low frequency antenna and the high frequency antenna.
2. The system for testing the low-frequency and high-frequency simultaneous detection of the electromagnetic interference according to claim 1, further comprising a low-frequency testing system and a high-frequency testing system, wherein the low-frequency testing system comprises a low-frequency radio-frequency switch and a low-frequency preamplifier, the low-frequency antenna, the low-frequency radio-frequency switch, the low-frequency preamplifier and the first filter bank are sequentially connected, the high-frequency testing system comprises a high-frequency radio-frequency switch and a high-frequency preamplifier, and the high-frequency antenna, the high-frequency radio-frequency switch, the high-frequency preamplifier and the second filter bank are sequentially connected.
3. The system for testing electromagnetic interference simultaneously at low and high frequencies according to claim 2, further comprising a first display module and a second display module, wherein the first display module is connected to the first controller, and the second display module is connected to the second controller.
4. The system according to claim 3, further comprising a power supply module and a noise filtering module, wherein the power supply module is connected to the noise filtering module, the noise filtering module is connected to the first controller and the second controller, the noise filtering module comprises a signal amplifier and an active filter, the signal amplifier is coupled to the active filter, the signal amplifier is connected to the power supply module, and the active filter is connected to the first controller and the second controller.
5. The system for simultaneously testing electromagnetic interference according to claim 1, wherein the darkroom further comprises a support platform, the device under test is placed on the support platform, and the vertical height of the platform surface of the support platform is equal to the vertical height of the receiving end of the high-frequency antenna and the receiving end of the low-frequency antenna.
6. The testing method for simultaneously detecting electromagnetic interference at low frequency and high frequency, which is characterized in that the testing system for simultaneously detecting electromagnetic interference at low frequency and high frequency as claimed in any one of claims 1-5 is included, and comprises the following contents:
s1: placing the tested equipment on a support table, checking the frequency peak value of the low-frequency interference signal on a first display module, and checking the frequency peak value of the high-frequency interference signal on a second display module;
s2: controlling the low-frequency execution module to move, judging whether the frequency peak value in the first display module is changed, if so, entering step S4, otherwise, entering step S3;
s3: when the high-frequency antenna does not generate signal interference on the low-frequency antenna, reading frequency data on the first display module as a low-frequency interference value of the tested equipment, and reading frequency data on the second display module as a high-frequency interference value of the tested equipment;
s4: and the mutual interference distance between the high-frequency antenna and the low-frequency antenna is calculated through the frequency mutual interference module.
7. The method for testing simultaneous detection of electromagnetic interference at low and high frequencies according to claim 6, wherein the mutual interference distance in step S4 is calculated as follows:
in the formula (I), the compound is shown in the specification,
the mutual interference distance of the high-frequency interference signal and the low-frequency interference signal of the tested device,
the distance between the receiving end of the low frequency antenna and the device under test,
the distance between the receiving end of the high-frequency antenna and the tested equipment,
for the frequency peak on the first display module before the low frequency execution module moves,
the frequency peak on the first display module after performing the mode shift for low frequencies,
is the test voltage for the device under test,
subjecting a device under test to a test voltage
The value of the current at the time of the current,
is the wave impedance in the dark box during the test.
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Application publication date: 20211224 |