CN110988497A - Magnetic field immunity testing device and method for magnetic coupling digital isolator - Google Patents
Magnetic field immunity testing device and method for magnetic coupling digital isolator Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
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Abstract
The invention provides a magnetic field immunity testing device and method for a magnetic coupling digital isolator, and aims to evaluate the magnetic field immunity of the magnetic coupling digital isolator. The magnetic field generating device is characterized in that an adjustable direct current power supply, an audio signal source and a radio frequency signal source provide signals of different frequency bands, the adjustable direct current power supply is connected with a Helmholtz coil, the audio signal source and the radio frequency signal source are respectively connected with the magnetic field generating device, the Helmholtz coil, a radiation ring and a TEM cell through two corresponding power amplifiers and used for covering test frequency bands required by different standards, the signals are applied to a tested device through the magnetic field generating device after being subjected to power amplification, the magnetic field strength value is monitored in real time through a magnetic field detection device, and the output level of the direct current power supply, the audio signal source or the radio frequency signal source is properly adjusted according to the fed-back magnetic field strength information to achieve the required. Through the arrangement, a user can conveniently and quickly complete the test of the immunity of the magnetic coupling digital isolator.
Description
Technical Field
The invention relates to the field of digital isolators, in particular to a magnetic field immunity testing device and method of a magnetic coupling digital isolator.
Background
The application environment of the digital isolator generally comprises a plurality of generators and other devices for generating strong electromagnetic fields. Exposure to these magnetic fields can cause potential data corruption problems because the potential (EMF, i.e., the voltage developed by these fields) can interfere with data signal transmission. Because of this potential threat, many digital isolator users require isolators to be provided with high Magnetic Field Immunity (MFI).
A live conductor, such as the power cord of an electric motor, is surrounded by a magnetic field formed by the current flowing through it. The direction of the magnetic field can be determined using a right hand rule. The plane of the flux lines is always perpendicular to the current. Magnetic flux density B of the DC current. In the case of AC current, the right-hand rule is used for both directions, both the magnetic field and the AC current varying with a frequency f: b (f) to I (f). The magnetic field (or more precisely the magnetic flux density and its corresponding magnetic field strength) decreases with increasing distance from the centre axis of the conductor. These relationships can be expressed as: b ═ y (μ 0I)/(2 pi r)
And: h ═ B/. mu.0 ═ I/(2 pi r)
Where B is the magnetic flux density, μ 0 is the magnetic permeability in free space, I is the current, r is the conductor distance, and H is the magnetic field strength.
As the magnetic field lines traverse nearby conductor loops, they generate an EMF whose magnitude depends on the loop area and flux density and magnetic field frequency:
EMF(f)＝B×2πf×A
EMF is the potential, f is the magnetic field frequency, and A is the loop area.
All isolators have a conductive loop shaped or formed to allow the magnetic field lines to pass through and generate an EMF. This EMF, which is superimposed on the signal voltage, can lead to erroneous data transmission if the intensity is sufficiently large.
Therefore, in order to test the immunity of the magnetic coupling isolator to the interference magnetic field, the present application proposes a testing device for the above process.
Disclosure of Invention
In view of the above, the present invention provides a magnetic field immunity testing apparatus and method for a magnetically coupled digital isolator, which can solve the problem of evaluating and testing the magnetic field immunity of the magnetically coupled digital isolator and truly reflect the immunity of a device under test to an interfering magnetic field.
Based on the above object, the present invention provides a magnetic field immunity testing apparatus for a magnetically coupled digital isolator, comprising: the device comprises a control computer and a tested isolator, wherein the control computer is connected with a magnetic field generation device and a magnetic field monitoring device, the tested isolator comprises an output end, and the output end is connected with an oscilloscope.
Preferably, the magnetic field detection device is a gauss meter.
Preferably, the magnetic field generating device comprises a constant magnetic field generator, the constant magnetic field generator comprises an adjustable direct current power supply, and the adjustable direct current power supply is connected with a direct current Helmholtz coil.
Preferably, the magnetic field generating device comprises an audio magnetic field generator, the audio magnetic field generator comprises an audio signal source, the signal frequency range is 0.1Hz to 150kHz, the audio signal source is connected with an audio power amplifier, and the audio power amplifier is connected with an audio Helmholtz coil.
Preferably, the magnetic field generating device comprises a low-radio-frequency magnetic field generator, the low-radio-frequency magnetic field generator comprises a low-radio-frequency signal source, the signal frequency range is 9kHz to 30MHz, the low-radio-frequency signal source is connected with a low-radio-frequency power amplifier, and the low-radio-frequency power amplifier is connected with a low-frequency radiation ring.
Preferably, the magnetic field generating device comprises a high-radio-frequency magnetic field generator, the high-radio-frequency magnetic field generator comprises a high-radio-frequency signal source and a TEM cell, the signal frequency range is 9kHz to 300MHz, the high-radio-frequency signal source is connected with a high-radio-frequency power amplifier, the high-radio-frequency power amplifier is connected with a high-frequency radiation ring, and the high-frequency radiation ring and the measured isolator are located in the TEM cell.
Preferably, the oscilloscope is connected with the control computer.
Preferably, the method for testing the magnetic field immunity of the magnetic coupling digital isolator comprises the following steps:
s1, placing the isolator to be tested at the center of the interference test space, and defining the isolator to be tested as an X axis;
s2, connecting a corresponding magnetic field generator through a control computer, injecting an interference signal source, and adjusting to the required magnetic field intensity according to the feedback of the magnetic field monitoring device;
s3, observing and recording the output state of the isolator to be tested by using an oscilloscope;
s4, repeating the steps to perform the anti-interference test of the digital isolator at the Y-axis position vertical to the X-axis;
s5, repeating the above steps to complete the output state of the isolator under the constant magnetic field generator, the audio magnetic field generator, the low radio frequency magnetic field generator and the high radio frequency magnetic field generator;
and S6, integrating the data states to judge the noise immunity of the isolator to be tested.
From the above, the magnetic field immunity testing device and method for the magnetic coupling digital isolator provided by the invention can provide a constant magnetic field and a high-frequency magnetic field in the range of 0.2Hz to 300MHz due to the fact that the magnetic field generating device comprises the constant magnetic field generator, the audio magnetic field generator, the low-radio-frequency magnetic field generator and the high-radio-frequency magnetic field generator, and can more accurately embody the immunity of the magnetic coupling digital isolator due to the wide testing magnetic field range; in the whole device and the method, the control computer can automatically complete most of operations, so that a user has higher working efficiency when testing, and the cost can be saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic block diagram of the magnetic field immunity test of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In an embodiment, referring to fig. 1 and 2, a magnetic field immunity testing device of a magnetic coupling digital isolator, a control computer and a tested isolator, wherein the control computer is connected with a magnetic field generating device and a magnetic field monitoring device, the tested isolator comprises an output end, and the output end is connected with an oscilloscope. The magnetic field detection device in this embodiment is a gaussmeter. The gaussmeter is fixed in the interference test space, typically in the central position of the test space.
Through the device, the control computer controls the magnetic field generating device to interfere with the isolator to be detected, the interference result is displayed and represented through the oscilloscope, the magnetic field detecting device can specifically monitor the interference magnetic field and feed the interference magnetic field back to the control computer, and the control computer performs corresponding operation.
Wherein, the magnetic field generating device comprises a constant magnetic field generator, an audio frequency magnetic field generator, a low radio frequency magnetic field generator and a high radio frequency magnetic field generator. The arrangement of the magnetic field generators ensures the test of the diversity of the isolator to be tested, such as a constant magnetic field, a constant variable frequency magnetic field and the like, and can be more suitable for the real working state of the isolator to be tested.
The constant magnetic field generator comprises an adjustable direct current power supply, the adjustable direct current power supply is connected with a direct current Helmholtz coil, and the interference magnetic field is a constant magnetic field with constant direction and constant magnetic field intensity.
The audio magnetic field generator comprises an audio signal source, the signal frequency range is 0.1Hz to 150kHz, the audio signal source is connected with an audio power amplifier, the audio power amplifier is connected with an audio Helmholtz coil, and the interference magnetic field is that the magnetic field intensity is certain but the direction is changed with certain frequency.
The low-radio-frequency magnetic field generator comprises a low-radio-frequency signal source, the low-radio-frequency signal source with the signal frequency range of 9kHz to 30MHz is connected with a low-radio-frequency power amplifier, the low-radio-frequency power amplifier is connected with a radiation ring, the low-radio-frequency radiation ring refers to a coil capable of passing large current, and the interference magnetic field is that the magnetic field intensity of the magnetic field on an X axis and a Y axis is distributed according to a certain rule, and the magnetic field direction is changed according to.
The high-radio-frequency magnetic field generator comprises a high-radio-frequency signal source and a TEM cell, the signal frequency range is 9kHz to 300MHz, the high-radio-frequency signal source is connected with a high-radio-frequency power amplifier, the high-radio-frequency power amplifier is connected with a high-frequency radiation ring, the high-frequency radiation ring and the low-frequency radiation ring have the same corresponding structure, and the high-frequency radiation ring and the measured isolator are located in the TEM cell. The interference magnetic field is similar to the interference magnetic field in the low-frequency magnetic field generator, but the change frequency of the direction of the interference magnetic field is wider, and the influence of an external magnetic field on the interference magnetic field can be avoided due to the arrangement of the TEM cell.
The control computer is connected with the oscilloscope. The connection of the control computer and the oscilloscope ensures that the test device is more convenient to operate, and the analysis of the waveform of the oscilloscope is more convenient, so that the automation degree of the test device is increased, and the test efficiency is improved.
The method for testing the magnetic field immunity of the magnetic coupling digital isolator is characterized by comprising the following steps of:
and S1, placing the isolator to be tested at the central position of the interference test space, and defining the X axis. And the X axis and the Y axis are defined, so that the interference degrees at different positions in the test space can be correspondingly reflected. The X axis is generally the axial center, such as the axial center of a helmholtz coil or the axial center of a radiation ring, and the Y axis may be any direction perpendicular to the X axis because the magnetic field distribution takes the X axis as the center of symmetry.
And S2, connecting the corresponding magnetic field generator through the control computer, injecting an interference signal source, and adjusting to the required magnetic field intensity according to the feedback of the magnetic field monitoring device. The position of the magnetic field detection device is relatively fixed, so that the magnetic field condition of the position can be embodied, the magnetic field strength of the position reaches a certain value, the interference degree of multiple measurements can be realized, and certain contrast is realized.
And S3, observing and recording the output state of the isolator to be tested by using an oscilloscope. The oscilloscope can observe the output corresponding waveform of the isolator to be tested due to interference, and is a specific representation of the interference degree.
And S4, repeating the steps to perform the anti-interference test of the digital isolator at the Y-axis position vertical to the X-axis. The linear measurement is changed into the three-dimensional distribution measurement, so that the interference degree result is more scientific.
And S5, repeating the steps to finish the output state of the isolator under the constant magnetic field generator, the audio magnetic field generator, the low radio frequency magnetic field generator and the high radio frequency magnetic field generator. Through the step, the interference degree condition of the isolator to be measured under the condition of magnetic field interference of different frequencies can be measured specifically. Because the frequency range is wide in coverage, the interference degree of the magnetic coupling digital isolator can be embodied when the magnetic coupling digital isolator works in different magnetic field interferences.
And S6, integrating the data states to judge the noise immunity of the isolator to be tested. Through the operations of the steps from S1 to S6, the corresponding interference degree of the isolator to be tested in different magnetic fields and magnetic fields with different frequencies can be measured, and scientific and referable results can be obtained.
It should be noted that since the measurement in the Y-axis direction is not practical because the magnetic field is uniformly distributed when the test is performed in the constant magnetic field generator and the audio magnetic field generator, the corresponding operation may not be performed.
In summary, the magnetic field immunity testing device and method for the magnetic coupling digital isolator provided by the invention can provide a constant magnetic field and a high-frequency magnetic field in the range of 0.2Hz to 300MHz because the magnetic field generating device comprises the constant magnetic field generator, the audio magnetic field generator, the low-radio-frequency magnetic field generator and the high-radio-frequency magnetic field generator, and can more accurately embody the immunity of the magnetic coupling digital isolator because the testing magnetic field range is wide; in the whole device and the method, the control computer can automatically complete most of operations, so that a user has higher working efficiency when testing, and the cost can be saved.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. Magnetic field immunity testing arrangement of magnetic coupling digital isolator, its characterized in that includes: the device comprises a control computer and a tested isolator, wherein the control computer is connected with a magnetic field generation device and a magnetic field monitoring device, the tested isolator comprises an output end, and the output end is connected with an oscilloscope.
2. The magnetically-coupled digital isolator magnetic field immunity test apparatus of claim 1, wherein said magnetic field detection apparatus is a gauss meter.
3. The magnetically-coupled digital isolator magnetic field immunity test apparatus of claim 2, wherein the magnetic field generating device comprises a constant magnetic field generator comprising an adjustable dc power supply connected to a dc helmholtz coil.
4. The magnetically-coupled digital isolator magnetic field immunity test apparatus of claim 2, wherein said magnetic field generating means comprises an audio magnetic field generator, said audio magnetic field generator comprising an audio signal source, said signal frequency range being 0.1Hz to 150kHz, said audio signal source being connected to an audio power amplifier, said audio power amplifier being connected to an audio helmholtz coil.
5. The magnetically-coupled digital isolator magnetic field immunity test apparatus of claim 2, wherein the magnetic field generating means comprises a low rf magnetic field generator comprising a low rf signal source connected to a low rf power amplifier connected to a low rf radiating loop, the signal frequency range being 9kHz to 30 MHz.
6. The device for testing the magnetic field immunity of a magnetically coupled digital isolator according to claim 2, wherein the magnetic field generating device comprises a high radio frequency magnetic field generator, the high radio frequency magnetic field generator comprises a high radio frequency signal source and a TEM cell, the signal frequency range is 9kHz to 300MHz, the high radio frequency signal source is connected with a high radio frequency power amplifier, the high radio frequency power amplifier is connected with a high frequency radiation ring, and the high frequency radiation ring and the isolator to be tested are located in the TEM cell.
7. The magnetically-coupled digital isolator magnetic field immunity testing apparatus of claim 4, wherein said oscilloscope is connected to said control computer.
8. The method for testing the magnetic field immunity of the magnetic coupling digital isolator is characterized by comprising the following steps of:
s1, placing the isolator to be tested at the center of the interference test space, and defining the isolator to be tested as an X axis;
s2, connecting a corresponding magnetic field generator through a control computer, injecting an interference signal source, and adjusting to the required magnetic field intensity according to the feedback of the magnetic field monitoring device;
s3, observing and recording the output state of the isolator to be tested by using an oscilloscope;
s4, repeating the steps to perform the anti-interference test of the digital isolator at the Y-axis position vertical to the X-axis;
s5, repeating the above steps to complete the output state of the isolator under the constant magnetic field generator, the audio magnetic field generator, the low radio frequency magnetic field generator and the high radio frequency magnetic field generator;
and S6, integrating the data states to judge the noise immunity of the isolator to be tested.
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Application publication date: 20200410 |