CN113777421A - Power line low-frequency radiation immunity testing system and method based on crosstalk injection - Google Patents
Power line low-frequency radiation immunity testing system and method based on crosstalk injection Download PDFInfo
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Abstract
The invention discloses a power line low-frequency radiation immunity testing system and method based on crosstalk injection, belongs to the field of electromagnetic compatibility testing methods of electrical and electronic equipment, and aims to solve the problems that the radiation immunity testing method based on a darkroom irradiation method is complex and time-consuming and high in cost, and the radiation efficiency of a low-frequency-band antenna below 1GHz is low. The radiation immunity test system provided by the invention has high coupling efficiency by adopting a near-field crosstalk method, saves expensive equipment such as a microwave darkroom, a broadband radiation antenna and the like, saves the time cost and the equipment cost required by the radiation immunity test, and has better application prospect in the field of electromagnetic compatibility test methods of electrical and electronic equipment.
Description
Technical Field
The invention belongs to the field of electromagnetic compatibility (EMC) testing methods for electrical and electronic equipment, and relates to a crosstalk injection-based power line low-frequency radiation immunity testing system and method.
Background
Radiation immunity is a basic electromagnetic compatibility (EMC) test item for testing the ability of electrical and electronic equipment to withstand electromagnetic interference from radiation of a certain intensity. The anechoic chamber irradiation method is a radiation immunity test method which is most widely applied, and the principle is that in an anechoic chamber space, a broadband radiation antenna is utilized to generate electromagnetic radiation interference with certain intensity, equipment to be tested (EUT) which is positioned on a rotary table and rotates continuously is excited one by one at frequency points, and the immunity of the equipment is evaluated by observing whether the EUT generates interference, restarting, downtime and other effect phenomena. International electrotechnical Commission Standard IEC 61000-4-3, Radiated, radio-frequency electromagnetic field intensity test, International Commission on radio interference Special Commission Standard CISPR 24 Information technology Equipment-Immunity characteristics-Limits and methods of measurement, Chinese national Standard GB/T17626.3-2016: the method is specified in detail in standards such as a radio frequency electromagnetic field radiation immunity test and the like. However, for the low frequency band below 1GHz, the size of the required radiation antenna is relatively large, the gain is low, and strict requirements are provided for equipment indexes such as darkroom size, power amplifier gain and the like, so that the problems of complex operation, time-consuming test and high cost are caused, and the requirement of frequently carrying out radiation immunity test in the design and rectification process is difficult to meet.
Therefore, the academic world provides a method for testing radiation immunity in various low-frequency bands. Pignari et al propose a method for carrying out radiation immunity test by using heavy current injection (BCI), and the principle is that two current injection clamps are used as coupling equipment, and voltage and current interference equivalent to antenna radiation is excited at a cable port of equipment to be tested by accurately controlling the amplitude and phase of loading excitation of the injection clamps. The large-current injection method solves the problem that the coupling efficiency of the test method in a low-frequency band is not high, but the operation process is still complex and time-consuming, and the main reason is that the required applied interference is a variable related to the input impedance of the equipment to be tested, and is theoretically only suitable for equipment with linear impedance. Grassi et al further propose a method for testing radiation immunity by using a dual-source crosstalk injection method, and by erecting equal-length and parallel excitation lines beside a disturbed cable and exciting by using two independent interference sources with controllable output amplitudes and phases, interference equivalent to darkroom irradiation effect is generated at a disturbed equipment port. The method has the advantages that the output amplitude and the phase required by the interference source are independent of the input impedance of the equipment, and the uniform loading interference intensity can be used for any equipment including nonlinear equipment. However, because two interference sources are used, the difficulty in the precise control of the amplitude and the phase of the output interference is high, and the difficulty of the test method is still high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a power line low-frequency radiation immunity testing system and method based on crosstalk injection, and aims to solve the technical problems that in the prior art, a radiation immunity testing method based on a darkroom irradiation method is complex and time-consuming, high in cost and low in radiation efficiency due to a low-frequency-band antenna below 1 GHz.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention provides a power line low-frequency radiation immunity testing system based on crosstalk injection, which comprises a flat plate and a radio frequency interference source, wherein the flat plate is arranged in a grounding mode, the radio frequency interference source is arranged on the flat plate, and the flat plate is also provided with a line impedance stabilizing network for supplying power to equipment to be tested, a power amplifier for amplifying interference power generated by the radio frequency interference source and a matched load for avoiding signal reflection;
the device to be tested is electrically connected with the line impedance stabilizing network, and the radio frequency interference source, the power amplifier and the matched load are electrically connected.
Preferably, the flat plate is paved by a good conductor metal plate with a smooth surface, and the thickness is not less than 1 mm.
Preferably, the device to be tested is connected with the line impedance stabilization network through a power line, and the power amplifier is connected with the matching load through an injection line.
Preferably, the power line and the injection line are arranged above the flat plate at the same height, and are parallel to the flat plate.
Preferably, the radio frequency interference source is located at the side of the device under test.
The invention also provides a radiation immunity test method of the power line low-frequency radiation immunity test system based on crosstalk injection, which comprises the following steps:
s1, measuring the common-mode input impedance Z of the line impedance stabilizing network in the radiation immunity test frequency bandPDevice to be testedObtaining the electric field intensity E of the electromagnetic wave applied in the darkroom irradiation method according to the frequency change rule0An incident angle theta formed by the incident direction of the electric field and the vertical direction of the electric field, a direction angle psi formed by the incident surface of the electromagnetic wave and the cable along the line direction, and a polarization angle eta formed by the electric field component and the incident surface;
s2, selecting the test frequency f of the radio frequency interference source and the internal resistance R of the power amplifieri1And same internal resistance Ri1Equal-sized matched-load resistance Ri2Calculating the port open-circuit voltage V of the device to be tested under the darkroom irradiation methodFC；
S3, according to the open circuit voltage VFCAnd the test frequency f calculates the crosstalk coupling coefficient alphaXT；
S4, coupling coefficient alpha according to crosstalkXTCalculating the applied voltage Vs；
And S5, changing the frequency of the equipment to be tested, the incident angle theta, the direction angle psi and the polarization angle eta of the electromagnetic wave according to the test requirement until all the test working conditions are exhausted.
Preferably, the port open-circuit voltage V of the device to be tested under the darkroom irradiation methodFCThe calculation method of (2) is shown in formula (1):
wherein sinh is hyperbolic sine function, cosh is hyperbolic cosine function, l ═ lr＝lgIs the length of the power supply line, gamma0＝j2πf/c0As propagation constant, speed of light c0＝2.998×108m/s，ZgIs the characteristic impedance of the power supply line,
expressed as the conjugate operation of the equivalent open-circuit electromotive force,
expressed as the inverse of the power line characteristic impedance; h isr＝hgThe height of the power line from the flat plate is F, G the coplanar wave angleThe degree-dependent variables, F and G, are calculated as shown in equation (2):
preferably, the crosstalk coupling coefficient αXTThe calculation method of (2) is shown in formula (3):
wherein Z ismIs the mutual impedance between the interference line and the power line.
Preferably, a voltage V is appliedsThe calculation method of (2) is shown in formula (4):
VS＝VFC/αXT (4)。
compared with the prior art, the invention has the following beneficial effects:
according to the power line low-frequency radiation immunity test system based on crosstalk injection, the radio frequency interference source and the power amplifier are connected to the flat plate which is arranged in a grounding mode, so that the power amplifier can amplify interference power generated by the radio frequency interference source conveniently; the circuit impedance stabilizing network is connected on the panel to supply power to the equipment to be tested, and the circuit impedance stabilizing network arranged on the panel can also play a role in stabilizing the impedance of the power grid; the device to be tested and the line impedance stabilizing network are electrically connected, and then the radio frequency interference source, the power amplifier and the matched load are electrically connected to form a crosstalk combined line. The radio frequency interference source can generate continuous wave interference with any frequency in the working frequency band below 1 GHz. The radiation immunity test system provided by the invention has high coupling efficiency by adopting a near-field crosstalk method, saves expensive equipment such as a microwave darkroom, a broadband radiation antenna and the like, saves the time cost and the equipment cost required by the radiation immunity test, and has better application prospect in the field of electromagnetic compatibility test methods of electrical and electronic equipment.
Further, the metal plate flat provides a mirror image ground, the metal plate exists as a mirror image ground in the standard radiation method, the method is used as an equivalent alternative method of the standard method, and the platform design is consistent with the standard method.
Furthermore, the power line and the injection line are arranged above the flat plate at equal height, and the equal height arrangement can simplify a calculation formula of the output power of a rear radio frequency interference source and reduce the difficulty; the power line and the injection line are both parallel to the flat plate, which is a necessary requirement for carrying out equivalence derivation by using a transmission line equation and is a necessary condition for the establishment of a subsequent calculation formula.
Further, the radio frequency interference source and the device to be tested should be located on the left side or the right side of the cable at the same time, and if the radio frequency interference source and the device to be tested are located on both sides, the following interference source output amplitude formula is not established, so that the method is not applicable.
The invention also discloses a radiation immunity testing method of the power line low-frequency radiation immunity testing system based on crosstalk injection, which inherits the advantage that the excitation waveform of the traditional crosstalk injection method is irrelevant to the disturbed equipment, reduces the difficulty and the cost of the radiation immunity testing based on the crosstalk injection, and realizes the simple and cheap low-frequency radiation immunity testing. Compared with a double-source injection test method, the method reduces the number of the required interference source-power amplifier systems from two sets to one set, has low requirement on test environment, is recommended to be developed in a shielding room, does not need a microwave darkroom environment, has far less equipment number and cost than a standard darkroom irradiation method, and has low test cost, simple test operation method and wide applicability.
Furthermore, compared with the large current injection test, the loading voltage required to be applied in the invention and the input impedance Z of the device to be testedEUTIndependently, only related to the platform structure, the electrical parameters and the parameters of the interference field to be investigated, and the method is also suitable for the interference field with the nonlinear input resistanceThe anti-to-be-tested equipment is simple in calculation of the loading interference voltage and low in overall testing difficulty.
Drawings
FIG. 1 is a cross-talk injected radiation immunity test platform proposed by the present invention;
FIG. 2 shows the definitions of the azimuth angle and the polarization angle of a plane incident wave in a spherical coordinate system;
FIG. 3 shows the LISN input impedance Z in the embodimentPA relationship that varies with frequency;
FIG. 4 shows the equivalent standard darkroom irradiation method (incident plane wave amplitude of 1V/m, incident angle)
The required interference loading voltage amplitude V when the direction angle psi is 90 DEG and the polarization angle eta is 90 DEGS；
FIG. 5 compares the amplitude of the current excited at the device port by the standard darkroom irradiation method and the testing method of the present invention, and the input impedance of the device under test considered is Z EUT100 omega, the dark room irradiation method considers that the application amplitude is 1V/m, the incident angle
Incident field interference with a direction angle psi of 90 DEG and a polarization angle eta of 90 DEG; in the testing method, the loading voltage V is controlled by adjusting the output amplitude of the interference source and the gain of the power amplifierSThe intensity levels shown in figure 4.
Wherein: 1-plate; 2-equipment to be tested; 3-a circuit impedance stabilization network; 4-a radio frequency interference source; 5-a power amplifier; 6-matched load; 7-a power line; 8-injection line.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments 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 of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
the invention provides a crosstalk injection-based power line low-frequency radiation immunity test system, which adopts a test platform shown in figure 1 to realize radiation immunity test, wherein the test platform comprises the following equipment:
the device comprises a flat plate 1 arranged on the ground, a device to be tested 2, a circuit impedance stabilizing network 3, a radio frequency interference source 4, a power amplifier 5, a matched load 6, a power line 7 and an injection line 8.
The radio frequency interference source 4 is arranged on the flat plate 1, and the flat plate 1 is also provided with a line impedance stabilizing network 3 for supplying power to the equipment to be tested 2, a power amplifier 5 for amplifying interference power generated by the radio frequency interference source 4 and a matching load 6 for avoiding signal reflection; the device to be tested 2 is electrically connected with the line impedance stabilizing network 3, and the radio frequency interference source 4, the power amplifier 5 and the matching load 6 are electrically connected.
1) The device under test (EUT)2, the device under test 2 is a single-phase or three-phase electrical or electronic device supplied with power through a power line 7. The device powered by the battery and wirelessly powered is not suitable for the test method. The device needs to ensure good shielding itself.
2) And the Line Impedance Stabilizing Network (LISN)3 plays a role in stabilizing the impedance of the power grid side, and can refer to the CISPR 16 standard model selection, and the line impedance stabilizing network 3 needs to be adapted to the type of the power line 7 of the device to be tested 2.
3) The radio frequency interference source 4 can generate continuous wave interference with any frequency in the working frequency band below 1 GHz.
4) A power amplifier 5 for amplifying the interference power generated by the RF interference source 4, wherein the working frequency of the power amplifier 5 is adapted to the RF interference source 4 and covers the frequency band below 1GHz, and the input impedance R of the devicei1Typically 50 omega.
5) The flat plate 1 arranged in a grounding mode is preferably laid by using a good conductor metal plate with a flat surface, and the thickness of the flat plate is not less than 1 mm.
6) The injection line 8 is a bare conductor of good conductor, and the length l of the injection line 8gThe same length as the power supply line 7, i.e. l ═ lg＝lr。
7) The matched load 6 is denoted as Ri2For avoiding signal reflections at the end of the injection line 8.
The construction key points of the test platform and the connection method of each device are as follows:
1) the power line 7 is parallel to the flat plate 1 which is arranged in a grounding way, and the power line 7 is erected at the same height hrA position hrNot more than 6cm, and the line length is not less than 0.5 m.
2) The injection line 8 is parallel to the grounded plate 1 and the power line 7, and the injection line 8 is erected at the same height hgHere, the distance between the injection line 8 and the power supply line 7 is s. h isgIs not more than 6cm, and s value is not less than 5 x max { rr,rg}。
3) The input side of the line impedance stabilizing network 3 is connected with the equipment to be tested 2 through a power line 7, and the output side of the line impedance stabilizing network 3 is connected with commercial power; the equipment to be tested 2 realizes power supply and various normal functions thereof through the line impedance stabilizing network 3. The line impedance stabilization network 3 is connected to ground to the ground plane 1.
4) The output of the radio frequency interference source 4 serves as an input of the power amplifier 5, and the output of the power amplifier 5 is connected to the injection line 8. The radio frequency interference source 4 is grounded and connected with the flat plate 1. The power amplifier 5 is connected to the ground of the plate 1.
5) The output of the radio frequency interference source 4 is connected with the input of the power amplifier 5, and the radio frequency interference source 4 is installed beside the device to be tested 2.
6) The output of the power amplifier 5 is connected with the injection line 8, if the output of the power amplifier 5 is of a coaxial output structure, the core wire of the power amplifier is connected with the injection line 8, and the rubber-insulated wire is connected with the flat plate 1.
7) The right end of the injection line 8 is coupled to the resistance R of the series-matched load 6i2Connected to the plate 1.
The invention provides an immunity test method of a power line low-frequency radiation immunity test system based on crosstalk injection, which comprises the following steps:
s1, measuring the common-mode input impedance Z of the line impedance stabilizing network 3 in the radiation immunity test frequency bandPAcquiring the electric field intensity E of the applied electromagnetic wave in the darkroom irradiation method according to the frequency change rule of the equipment to be measured 20An incident angle theta formed by the incident direction of the electric field and the vertical direction of the electric field, a direction angle psi formed by the incident surface of the electromagnetic wave and the cable along the line direction, and a polarization angle eta formed by the electric field component and the incident surface;
s2, selecting the test frequency f of the radio frequency interference source 4 and the internal resistance R of the power amplifier 5i1And same internal resistance Ri1Equal-sized resistance R of matched load 6i2And calculating the port open-circuit voltage V of the equipment to be tested 2 under the darkroom irradiation methodFC；
S3, according to the open circuit voltage VFCAnd the test frequency f calculates the crosstalk coupling coefficient alphaXT；
S4, coupling coefficient alpha according to crosstalkXTCalculating the applied voltage Vs；
And S5, changing the frequency of the device to be tested 2, the incident angle theta, the direction angle psi and the polarization angle eta of the electromagnetic wave according to the test requirement until all the test working conditions are exhausted.
The invention provides an immunity test method of a power line low-frequency radiation immunity test system based on crosstalk injection, which specifically comprises the following steps:
1) the test platform is established according to fig. 1, and the connection and attention points of the devices strictly comply with the above-mentioned regulations. According to the radiation immunity test standard to be followed, selecting the electric field intensity E of the plane electromagnetic wave required to be applied in the standard darkroom irradiation method0An incident angle θ formed by the incident direction of the electric field and the vertical direction of the electric field, a direction angle ψ formed by the incident plane of the electromagnetic wave and the cable along the line direction, and a polarization angle η formed by the electric field component and the incident plane, as shown in the spherical coordinate system definition method of fig. 2.
2) Measuring the common-mode input impedance Z of the line impedance stabilization network 3 in the radiation immunity test frequency bandPLaw of variation with frequency.
3) Selecting the test frequency f of the radio frequency interference source 4 and the internal resistance R of the power amplifier 5i1And same internal resistance Ri1Equal-sized resistance R of matched load 6i2Calculating the port response of the equipment to be tested 2 under the darkroom irradiation method, equivalently converting the darkroom irradiation method into a field line coupling process, and calculating the theoretical open-circuit voltage V of the side of the equipment to be tested 2FCOpen circuit voltage VFCThe calculation method of (2) is shown in formula (1):
wherein sinh is hyperbolic sine function, cosh is hyperbolic cosine function, l ═ lr＝lgIs the length of the power supply line, gamma0＝j2πf/c0As propagation constant, speed of light c0＝2.998×108m/s，ZgIs the characteristic impedance of the power supply line,
expressed as the conjugate operation of the equivalent open-circuit electromotive force,
expressed as the inverse of the power line characteristic impedance; F. g is a variable related to the angle of the plane wave, and the calculation method is shown as the formula (2):
4) according to the way voltage V of the test platformFCAnd testing the frequency f parameter, crosstalk coupling coefficient alphaXTThe calculation method of (2) is shown in formula (3):
wherein Z ismIs the mutual impedance between the disturbing line and the power line.
5) According to the crosstalk coupling coefficient alphaXTCalculating the applied voltage, applied voltage VsThe calculation method of (2) is shown in formula (4):
VS＝VFC/αXT (4)。
the output voltage is controlled to be V by adjusting the amplitude of the output voltage of the interference source or the gain of the power amplifierSAnd observing whether the equipment to be tested has the effects of logic errors, downtime, faults and the like.
6) According to the test requirement, reselecting the frequency f to be equivalent tested and the plane electromagnetic wave electric field intensity E0The incident angle theta, the direction angle psi and the polarization angle eta are repeated until all the test working conditions are exhausted.
Referring to the test platform shown in fig. 1, a single-phase power supply disturbed device is taken as an example (the length l of the power line 7 is 1m, and the diameter r of the power line 7 isg5mm) the preferred test implementation points are as follows.
The power line 7 is arranged in parallel at hgHeight of 5 cm; at a distance s equal to 10cm and a height hrThe diameter of the parallel mounting line is r at the position of 5cmrA bare copper wire with the thickness of 5mm is used as an injection wire 8, the left end of the injection wire 8 is connected with an interference source-power amplifier system, and the internal resistance of the equipment is Ri1Equal large resistance R is selected at the right end of the injection line 8 when the resistance is 50 omegai2The 50 Ω load is grounded. The device to be tested 2 is connected to the mains supply through the line impedance stabilizing network 3. Obtaining the input impedance Z of the line impedance stabilizing network 3 by consulting the technical manualPAs a function of frequencyThe relationship of the formation is shown in FIG. 3.
With equivalent amplitude E ═ 1V/m, angle of incidence:
the direction angle is as follows: ψ 90 °, polarization angle: taking an interference field with η equal to 90 ° as an example, the required applied voltage V is calculated according to formula (1), formula (2) and formula (3)SThe amplitude values are shown in fig. 4. By adjusting the output amplitude of the radio frequency interference source 4 and the gain control output voltage of the power amplifier 5, the injection current which can be generated by a standard darkroom irradiation test method can be simulated at the port of the device to be tested 2. With input impedance ZEUTAs an example of the device under test 2 of 100 Ω, the darkroom irradiation method and the port current of the device under test 2 excited by the present invention are shown in fig. 5. Therefore, the invention can realize complete equivalence with the standard darkroom irradiation method under the condition of simplifying test equipment and test method, and meets the radiation immunity test requirement of a low-frequency power line 7 system below 1 GHz.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. A power line low-frequency radiation immunity test system based on crosstalk injection is characterized by comprising a flat plate (1) and a radio frequency interference source (4), wherein the flat plate (1) is arranged in a grounding mode, the radio frequency interference source (4) is installed on the flat plate (1), a line impedance stabilizing network (3) used for supplying power to a device to be tested (2), a power amplifier (5) used for amplifying interference power generated by the radio frequency interference source (4) and a matching load (6) used for avoiding signal reflection are further installed on the flat plate (1);
the device to be tested (2) is electrically connected with the line impedance stabilizing network (3), and the radio frequency interference source (4), the power amplifier (5) and the matching load (6) are electrically connected.
2. The crosstalk injection-based power line low-frequency radiation immunity test system according to claim 1, wherein the flat plate (1) is laid by a good conductor metal plate with a flat surface, and the thickness of the flat plate is not less than 1 mm.
3. The crosstalk injection-based power line low-frequency radiation immunity test system according to claim 1, characterized in that the device under test (2) and the line impedance stabilization network (3) are connected through a power line (7), and the power amplifier (5) and the matching load (6) are connected through an injection line (8).
4. The crosstalk injection-based power line low frequency radiation immunity test system according to claim 3, characterized in that the power line (7) and the injection line (8) are arranged equally high above the flat plate (1), and the power line (7) and the injection line (8) are both parallel to the flat plate (1).
5. The crosstalk injection-based power line low-frequency radiation immunity test system according to claim 1, characterized in that the radio frequency interference source (4) is located at the side of the device under test (2).
6. The radiation immunity test method of the power line low-frequency radiation immunity test system based on the crosstalk injection as claimed in any one of claims 1 to 5, comprising the following steps:
s1, measuring the common-mode input impedance Z of the line impedance stabilizing network (3) in the radiation immunity test frequency bandPAcquiring the electric field intensity E of the applied electromagnetic wave in the darkroom irradiation method along with the frequency change rule of the equipment (2) to be measured0An incident angle theta formed by the incident direction of the electric field and the vertical direction of the electric field, a direction angle psi formed by the incident surface of the electromagnetic wave and the cable along the line direction, and a polarization angle eta formed by the electric field component and the incident surface;
s2, selecting the test frequency f of the radio frequency interference source (4) and the internal resistance R of the power amplifier (5)i1And same internal resistance Ri1Equal-sized resistance R of matched load (6)i2Calculating the port open-circuit voltage V of the equipment (2) to be tested under the darkroom irradiation methodFC；
S3, according to the open circuit voltage VFCAnd a test frequency fCalculating the crosstalk coupling coefficient alphaXT；
S4, coupling coefficient alpha according to crosstalkXTCalculating the applied voltage Vs；
And S5, changing the frequency of the device to be tested (2), the incident angle theta, the direction angle psi and the polarization angle eta of the electromagnetic wave according to the test requirement until all the test working conditions are exhausted.
7. The method for testing the low-frequency radiation immunity of the power line based on crosstalk injection according to claim 6, wherein the port open-circuit voltage V of the device under test (2) under the darkroom irradiation methodFCThe calculation method of (2) is shown in formula (1):
wherein sinh is hyperbolic sine function, cosh is hyperbolic cosine function, l ═ lr＝lgIs the length of the power supply line (1), gamma0＝j2πf/c0As propagation constant, speed of light c0＝2.998×108m/s，ZgIs the characteristic impedance of the power supply line,
expressed as the conjugate operation of the equivalent open-circuit electromotive force,
expressed as the inverse of the power line characteristic impedance; h isr＝hgThe height of the power line (1) from the flat plate (1) is shown, F, G is a variable related to the plane wave angle, and the calculation method of F and G is shown in formula (2):
8. the power supply line low frequency injection based crosstalk of claim 7The radiation immunity testing method is characterized in that the crosstalk coupling coefficient alphaXTThe calculation method of (2) is shown in formula (3):
wherein Z ismIs the mutual impedance between the interference line and the power line (7).
9. The crosstalk injection-based power line low-frequency radiation immunity testing method according to claim 8, wherein a voltage V is loadedsThe calculation method of (2) is shown in formula (4):
VS＝VFC/αXT (4)。
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| CN114236291A (en) * | 2021-12-20 | 2022-03-25 | 宁波奥克斯电气股份有限公司 | Electromagnetic interference detection device, detection method and computer readable storage medium |
| CN115792441A (en) * | 2022-11-23 | 2023-03-14 | 苏州科标检测有限公司 | Radiation anti-interference test method and test system |
| CN115963330A (en) * | 2023-03-10 | 2023-04-14 | 荣耀终端有限公司 | Cable radiation emission detection method, electronic equipment and system |
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