CN117686959A - Magnetic field immunity verification device and method - Google Patents
Magnetic field immunity verification device and method Download PDFInfo
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- CN117686959A CN117686959A CN202311741439.5A CN202311741439A CN117686959A CN 117686959 A CN117686959 A CN 117686959A CN 202311741439 A CN202311741439 A CN 202311741439A CN 117686959 A CN117686959 A CN 117686959A
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Abstract
The invention discloses a magnetic field immunity verification device and method, comprising the following steps: the magnetic field immunity verification device comprises a receiving module, a filter circuit, an ACDC (alternating current to direct current) conversion circuit, a singlechip circuit, a touch screen circuit and a power supply circuit for supplying power to the magnetic field immunity verification device; the magnetic field immunity verification device can be used for verifying the capability of the magnetic field immunity equipment, namely, alternating-current magnetic field interference signals with the frequency being the test magnetic field frequency and the strength being the test magnetic field strength are sent out through the radiation coil of the magnetic field immunity equipment, the magnetic field strength test results of the alternating-current magnetic field interference signals are quantitatively measured and received by the magnetic field immunity verification device, and whether the capability of the magnetic field immunity verification device is qualified is judged based on whether the difference value between the magnetic field strength test results and the test magnetic field strength under each test magnetic field frequency is within a preset difference value threshold value.
Description
Technical Field
The invention relates to an ISO11452-8 magnetic field immunity test, in particular to a magnetic field immunity verification device and method.
Background
The wide application of new energy automobiles, the electromagnetic interference of high voltage and electronic circuits in the automobiles is increasing. The parts and passengers in the vehicle are interfered by the magnetic field in the vehicle, and if the interference is large, the normal operation of the equipment in the vehicle is affected. The magnetic field immunity test refers to that a large magnetic field is applied to the surface of a sample to see whether the tested sample can resist the interference of the large magnetic field, whether the sample can work normally or not is damaged in the application process, and the like. According to the standard requirements of ISO11452-8, the test requirements of the radiating coil method, the radiating coil being spaced from the sample 5CM, most of the in-car electronic components will be subjected to this test. The magnetic field immunity test generally uses a signal generator, a power amplifier and a radiation coil, and adjusts the output magnetic field by adjusting the output voltage of the signal generator.
The traditional magnetic field immunity test is a qualitative test, only the magnetic field immunity capability of a product can be roughly inspected, and how to inspect the test capability of a magnetic field immunity laboratory is not related to the current document.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: a magnetic field immunity verification apparatus and method are provided.
The technical scheme adopted by the invention is as follows:
a magnetic field immunity verification device, comprising: the magnetic field immunity verification device comprises a receiving module, a filter circuit, an ACDC (alternating current to direct current) conversion circuit, a singlechip circuit, a touch screen circuit and a power supply circuit for supplying power to the magnetic field immunity verification device; wherein the receiving module is placed in an unshielded box.
The receiving module is provided with a receiving coil, and the alternating current signal output by the receiving module is converted into a direct current signal by the ACDC conversion circuit after being filtered by the filter circuit;
the single-chip circuit is preset with a corresponding value relation of conversion variables corresponding to each magnetic field frequency, and the touch screen circuit can send a magnetic field frequency selection instruction to the single-chip circuit under the control of a user so as to select one of the preset magnetic field frequencies of the single-chip circuit as a test magnetic field frequency; the corresponding relation between the magnetic field frequency and the conversion variable is obtained by calibrating the magnetic field immunity verification device by using a standard magnetic field immunity source capable of sending out a magnetic field signal of the corresponding magnetic field frequency, for example: when the magnetic field signal with the magnetic field frequency of 15Hz and the standard magnetic field intensity of 1000A/m is sent by the standard magnetic field immunity source, the voltage of the direct current signal output by the ACDC conversion circuit of the magnetic field immunity capability verification device to the singlechip circuit is measured to be 55mV, and the direct current signal can be calibrated according to the following formula H=a=Vout: with this magnetic field immunity verification device, the conversion variable a=1000/55=18.18 for the magnetic field frequency of 15 Hz.
The singlechip circuit can convert the direct-current signal into a magnetic field strength test result H according to the formula H=a×Vout, and display the magnetic field strength test result H on the touch screen circuit; where a is a conversion variable corresponding to the test magnetic field frequency selected by the magnetic field frequency selection instruction, and Vout is the voltage of the dc signal.
As a preferred embodiment of the present invention: referring to fig. 2, the receiving module is a series circuit formed by connecting at least two receiving coils in series, and the radii of the receiving coils are different from each other and are nested in sequence from small to large, so that the receiving coils are coaxial and the winding directions of the receiving coils are the same.
Therefore, the invention can solve the problem that the single receiving coil is adopted to output too weak alternating current signals when the frequency and/or the intensity of the magnetic field of alternating current magnetic field interference signals sent by the radiation coil of the verified magnetic field interference device are low, so that the single chip microcomputer circuit cannot monitor the voltage of direct current signals output by the ACDC conversion circuit, and enhance the voltage of direct current signals output by the ACDC conversion circuit, thereby accurately verifying the capability of the verified magnetic field interference device when the frequency and/or the intensity of the magnetic field of the alternating current magnetic field interference signals are low.
A magnetic field immunity verification method is characterized in that: based on the implementation of the magnetic field immunity verification device, the magnetic field immunity verification device comprises:
s1, placing verified magnetic field immunity equipment and a magnetic field immunity capability verification device at a test position so that a radiation coil of the verified magnetic field immunity equipment and a receiving coil of the magnetic field immunity capability verification device are coaxial and keep a preset distance;
s2, controlling a radiation coil of the verified magnetic field immunity device to emit an alternating-current magnetic field interference signal with the frequency being the frequency of the test magnetic field and the intensity being the intensity of the test magnetic field; wherein the test magnetic field frequency may be 15Hz to 150kHz.
Step S3, starting the magnetic field immunity verification device so that a receiving module of the magnetic field immunity verification device receives the alternating-current magnetic field interference signal and outputs a corresponding alternating-current signal; selecting the test magnetic field frequency in the step S2 from the magnetic field frequency preset by the singlechip circuit through the touch screen circuit, and reading to obtain a magnetic field strength test result displayed on the touch screen circuit;
and S4, repeatedly executing the steps S1 to S3 according to the combination of each test magnetic field frequency and each test magnetic field intensity required by the verification test so as to measure a magnetic field intensity test result under each test magnetic field frequency, and judging whether the capability of the magnetic field immunity capability verification device is qualified or not based on whether the difference value between the magnetic field intensity test result under each test magnetic field frequency and the test magnetic field intensity is within a preset difference value threshold value.
Therefore, the magnetic field immunity capability verification device provided by the invention realizes capability verification of the magnetic field immunity equipment.
As a preferred embodiment of the present invention: referring to fig. 3, the receiving module is a series circuit formed by connecting at least two receiving coils in series, and the radius and winding direction of each receiving coil are the same, and each receiving coil is symmetrically distributed around the symmetry axis.
Therefore, the invention can solve the problem that the single receiving coil is adopted to output too weak alternating current signals when the frequency and/or the intensity of the magnetic field of alternating current magnetic field interference signals sent by the radiation coil of the verified magnetic field interference device are low, so that the single chip microcomputer circuit cannot monitor the voltage of direct current signals output by the ACDC conversion circuit, and enhance the voltage of direct current signals output by the ACDC conversion circuit, thereby accurately verifying the capability of the verified magnetic field interference device when the frequency and/or the intensity of the magnetic field of the alternating current magnetic field interference signals are low.
A magnetic field immunity verification method is characterized in that: based on the implementation of the magnetic field immunity verification device, the magnetic field immunity verification device comprises:
s1, placing verified magnetic field immunity equipment and a magnetic field immunity capability verification device at a test position so that a radiation coil of the verified magnetic field immunity equipment is coaxial with a symmetry axis of each receiving coil of the magnetic field immunity capability verification device and keeps a preset distance;
s2, controlling a radiation coil of the verified magnetic field immunity device to emit an alternating-current magnetic field interference signal with the frequency being the frequency of the test magnetic field and the intensity being the intensity of the test magnetic field; wherein the test magnetic field frequency may be 15Hz to 150kHz.
Step S3, starting the magnetic field immunity verification device so that a receiving module of the magnetic field immunity verification device receives the alternating-current magnetic field interference signal and outputs a corresponding alternating-current signal; selecting the test magnetic field frequency in the step S2 from the magnetic field frequency preset by the singlechip circuit through the touch screen circuit, and reading to obtain a magnetic field strength test result displayed on the touch screen circuit;
and S4, repeatedly executing the steps S1 to S3 according to the combination of each test magnetic field frequency and each test magnetic field intensity required by the verification test so as to measure a magnetic field intensity test result under each test magnetic field frequency, and judging whether the capability of the magnetic field immunity capability verification device is qualified or not based on whether the difference value between the magnetic field intensity test result under each test magnetic field frequency and the test magnetic field intensity is within a preset difference value threshold value.
Therefore, the magnetic field immunity capability verification device provided by the invention realizes capability verification of the magnetic field immunity equipment.
Preferably: the connecting wire between the receiving coil and the filter circuit is a twisted pair with shielding.
Preferably: the magnetic field immunity verification device further comprises an indicator lamp circuit, and the single-chip microcomputer circuit can control the indicator lamp circuit to light the indicator lamps of corresponding quantity according to the converted magnetic field strength test result so as to facilitate visual observation.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the magnetic field immunity verification device can be used for verifying the capability of the magnetic field immunity equipment, namely, an alternating-current magnetic field interference signal with the frequency being the test magnetic field frequency and the strength being the test magnetic field strength is sent out by a radiation coil of the magnetic field immunity equipment, the magnetic field strength test result of receiving the alternating-current magnetic field interference signal is quantitatively measured by the magnetic field immunity verification device, and whether the difference value between the magnetic field strength test result and the test magnetic field strength under each test magnetic field frequency is within a preset difference value threshold value is judged, so that whether the capability of the magnetic field immunity verification device is qualified is judged.
Secondly, the invention can solve the problem that the single receiving coil 1 is adopted to output too weak alternating current signals when the frequency and/or the intensity of the alternating current magnetic field interference signals sent by the radiation coils of the verified magnetic field interference devices are lower, so that the singlechip circuit cannot monitor the voltage of the direct current signals output by the ACDC conversion circuit, and the voltage of the direct current signals output by the ACDC conversion circuit is enhanced, so that the verified magnetic field interference devices can be accurately verified when the frequency and/or the intensity of the alternating current magnetic field interference signals are lower.
Thirdly, the invention can solve the problem that the single receiving coil 1 is adopted to output too weak alternating current signals when the frequency and/or the intensity of the alternating current magnetic field interference signals sent by the radiation coils of the verified magnetic field interference devices are lower, so that the singlechip circuit cannot monitor the voltage of the direct current signals output by the ACDC conversion circuit, and the voltage of the direct current signals output by the ACDC conversion circuit is enhanced, so that the verified magnetic field interference devices can be accurately verified when the frequency and/or the intensity of the alternating current magnetic field interference signals are lower.
Drawings
The invention is described in further detail below with reference to the attached drawings and to specific examples:
FIG. 1 is a schematic block diagram of a magnetic field immunity verification device of the present invention;
fig. 2 is a schematic diagram of a receiving coil arrangement of a receiving module according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a receiving coil arrangement of a receiving module according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following examples and the accompanying drawings to help those skilled in the art to better understand the inventive concept of the present invention, but the scope of the claims of the present invention is not limited to the following examples, and it is intended that those skilled in the art will not make any other examples of the inventive concept without departing from the scope of the inventive concept of the present invention.
Example 1
As shown in fig. 1, the present invention discloses a magnetic field immunity verification device, comprising: the magnetic field immunity verification device comprises a receiving module, a filter circuit, an ACDC (alternating current to direct current) conversion circuit, a singlechip circuit, a touch screen circuit and a power supply circuit for supplying power to the magnetic field immunity verification device; wherein the receiving module is placed in an unshielded box.
The receiving module is provided with a receiving coil 1, and alternating current signals output by the receiving module are converted into direct current signals by an ACDC conversion circuit after being filtered by a filter circuit;
the single-chip circuit is preset with a corresponding value relation of conversion variables corresponding to each magnetic field frequency, and the touch screen circuit can send a magnetic field frequency selection instruction to the single-chip circuit under the control of a user so as to select one of the preset magnetic field frequencies of the single-chip circuit as a test magnetic field frequency; the corresponding relation between the magnetic field frequency and the conversion variable is obtained by calibrating the magnetic field immunity verification device by using a standard magnetic field immunity source capable of sending out a magnetic field signal of the corresponding magnetic field frequency, for example: when the magnetic field signal with the magnetic field frequency of 15Hz and the standard magnetic field intensity of 1000A/m is sent by the standard magnetic field immunity source, the voltage of the direct current signal output by the ACDC conversion circuit of the magnetic field immunity capability verification device to the singlechip circuit is measured to be 55mV, and the direct current signal can be calibrated according to the following formula H=a=Vout: with this magnetic field immunity verification device, the conversion variable a=1000/55=18.18 for the magnetic field frequency of 15 Hz.
The singlechip circuit can convert the direct-current signal into a magnetic field strength test result H according to the formula H=a×Vout, and display the magnetic field strength test result H on the touch screen circuit; where a is a conversion variable corresponding to the test magnetic field frequency selected by the magnetic field frequency selection instruction, and Vout is the voltage of the dc signal.
The invention also discloses a magnetic field immunity verification method, which is characterized in that: based on the magnetic field immunity verification device implementation, the magnetic field immunity verification device comprises:
step S1, placing verified magnetic field immunity equipment and a magnetic field immunity capability verification device at a test position so that a radiation coil of the verified magnetic field immunity equipment and a receiving coil 1 of the magnetic field immunity capability verification device are coaxial and keep a preset distance;
s2, controlling a radiation coil of the verified magnetic field immunity device to emit an alternating-current magnetic field interference signal with the frequency being the frequency of the test magnetic field and the intensity being the intensity of the test magnetic field; wherein the test magnetic field frequency may be 15Hz to 150kHz.
Step S3, starting the magnetic field immunity verification device so that a receiving module of the magnetic field immunity verification device receives the alternating-current magnetic field interference signal and outputs a corresponding alternating-current signal; selecting the test magnetic field frequency in the step S2 from the magnetic field frequency preset by the singlechip circuit through the touch screen circuit, and reading to obtain a magnetic field strength test result displayed on the touch screen circuit;
and S4, repeatedly executing the steps S1 to S3 according to the combination of each test magnetic field frequency and each test magnetic field intensity required by the verification test so as to measure a magnetic field intensity test result under each test magnetic field frequency, and judging whether the capability of the magnetic field immunity capability verification device is qualified or not based on whether the difference value between the magnetic field intensity test result under each test magnetic field frequency and the test magnetic field intensity is within a preset difference value threshold value.
Therefore, the magnetic field immunity capability verification device provided by the invention realizes capability verification of the magnetic field immunity equipment.
The foregoing is a basic implementation of the first embodiment, and further optimization, improvement and limitation may be performed based on the basic implementation:
preferably: the connecting wire between the receiving coil 1 and the filter circuit is a twisted pair with shielding.
Preferably: the magnetic field immunity verification device further comprises an indicator lamp circuit, and the single-chip microcomputer circuit can control the indicator lamp circuit to light the indicator lamps of corresponding quantity according to the converted magnetic field strength test result so as to facilitate visual observation.
Example two
In addition to the first embodiment, the second embodiment also adopts the following preferred embodiments:
referring to fig. 2, the receiving module is a series circuit formed by connecting at least two receiving coils 1 in series, and the radii of the receiving coils 1 are different from each other and are nested in sequence from small to large, so that the receiving coils 1 are coaxial and the winding directions of the receiving coils 1 are the same.
Therefore, the invention can solve the problem that the single receiving coil 1 is adopted to output too weak alternating current signals when the frequency and/or the intensity of the alternating current magnetic field interference signals sent by the radiation coils of the verified magnetic field interference devices are low, so that the single chip microcomputer circuit cannot monitor the voltage of the direct current signals output by the ACDC conversion circuit, and enhance the voltage of the direct current signals output by the ACDC conversion circuit, thereby accurately verifying the capability of the verified magnetic field interference devices when the frequency and/or the intensity of the alternating current magnetic field interference signals are low.
Example III
In addition to the first embodiment, the third embodiment also adopts the following preferred embodiments:
referring to fig. 3, the receiving module is a series circuit formed by connecting at least two receiving coils 1 in series, and the radius and winding direction of each receiving coil 1 are the same, and each receiving coil 1 is symmetrically distributed around the symmetry axis L.
Therefore, the invention can solve the problem that the single receiving coil 1 is adopted to output too weak alternating current signals when the frequency and/or the intensity of the alternating current magnetic field interference signals sent by the radiation coils of the verified magnetic field interference devices are low, so that the single chip microcomputer circuit cannot monitor the voltage of the direct current signals output by the ACDC conversion circuit, and enhance the voltage of the direct current signals output by the ACDC conversion circuit, thereby accurately verifying the capability of the verified magnetic field interference devices when the frequency and/or the intensity of the alternating current magnetic field interference signals are low.
The magnetic field immunity verification method can also be implemented based on the magnetic field immunity verification device of the third embodiment, and the steps are basically the same, except that: in said step S1, the radiating coils of the magnetic field immunity device to be verified are coaxial with the symmetry axis L of the respective receiving coils 1 of the magnetic field immunity verification means and are maintained at a preset distance.
Specific:
the invention also discloses a magnetic field immunity verification method, which is implemented based on the magnetic field immunity verification device of the third embodiment, and comprises the following steps:
step S1, placing the verified magnetic field immunity equipment and a magnetic field immunity capability verification device at a test position so that a radiation coil of the verified magnetic field immunity equipment is coaxial with a symmetry axis L of each receiving coil 1 of the magnetic field immunity capability verification device and keeps a preset distance;
s2, controlling a radiation coil of the verified magnetic field immunity device to emit an alternating-current magnetic field interference signal with the frequency being the frequency of the test magnetic field and the intensity being the intensity of the test magnetic field; wherein the test magnetic field frequency may be 15Hz to 150kHz.
Step S3, starting the magnetic field immunity verification device so that a receiving module of the magnetic field immunity verification device receives the alternating-current magnetic field interference signal and outputs a corresponding alternating-current signal; selecting the test magnetic field frequency in the step S2 from the magnetic field frequency preset by the singlechip circuit through the touch screen circuit, and reading to obtain a magnetic field strength test result displayed on the touch screen circuit;
and S4, repeatedly executing the steps S1 to S3 according to the combination of each test magnetic field frequency and each test magnetic field intensity required by the verification test so as to measure a magnetic field intensity test result under each test magnetic field frequency, and judging whether the capability of the magnetic field immunity capability verification device is qualified or not based on whether the difference value between the magnetic field intensity test result under each test magnetic field frequency and the test magnetic field intensity is within a preset difference value threshold value.
Therefore, the magnetic field immunity capability verification device provided by the invention realizes capability verification of the magnetic field immunity equipment.
The present invention is not limited to the above-described embodiments, and according to the above-described matters, the present invention may be modified, replaced or altered in various equivalent ways without departing from the basic technical spirit of the present invention, all falling within the scope of the present invention, according to the general technical knowledge and conventional means in the art.
Claims (7)
1. A magnetic field immunity verification device, comprising: the magnetic field immunity verification device comprises a receiving module, a filter circuit, an ACDC (alternating current to direct current) conversion circuit, a singlechip circuit, a touch screen circuit and a power supply circuit for supplying power to the magnetic field immunity verification device;
the receiving module is provided with a receiving coil (1), and alternating current signals output by the receiving module are converted into direct current signals by an ACDC conversion circuit after being filtered by a filter circuit;
the single-chip circuit is preset with a corresponding value relation of conversion variables corresponding to each magnetic field frequency, and the touch screen circuit can send a magnetic field frequency selection instruction to the single-chip circuit under the control of a user so as to select one of the preset magnetic field frequencies of the single-chip circuit as a test magnetic field frequency;
the singlechip circuit can convert the direct-current signal into a magnetic field strength test result H according to the formula H=a×Vout, and display the magnetic field strength test result H on the touch screen circuit; where a is a conversion variable corresponding to the test magnetic field frequency selected by the magnetic field frequency selection instruction, and Vout is the voltage of the dc signal.
2. The magnetic field immunity verification apparatus of claim 1, wherein: the receiving module is a serial circuit formed by connecting at least two receiving coils (1) in series, and the radiuses of the receiving coils (1) are different from each other and are sequentially nested and arranged in the order from small to large, so that the receiving coils (1) are coaxial, and the winding directions of the receiving coils (1) are the same.
3. The magnetic field immunity verification apparatus of claim 1, wherein: the receiving module is a series circuit formed by connecting at least two receiving coils (1) in series, the radius and the winding direction of each receiving coil (1) are the same, and each receiving coil (1) is symmetrically distributed around a symmetrical axis (L).
4. A magnetic field immunity verification apparatus as defined in any one of claims 1 to 3, wherein: the connecting wire between the receiving coil (1) and the filter circuit is a twisted pair with shielding.
5. A magnetic field immunity verification apparatus as defined in any one of claims 1 to 3, wherein: the magnetic field immunity verification device further comprises an indicator lamp circuit, and the single-chip microcomputer circuit can control the indicator lamp circuit to light the indicator lamps with corresponding numbers according to the converted magnetic field strength test result.
6. A magnetic field immunity verification method is characterized in that: the magnetic field immunity verification apparatus implementation of claim 1 or 2, comprising:
s1, placing verified magnetic field immunity equipment and a magnetic field immunity capability verification device at a test position so that a radiation coil of the verified magnetic field immunity equipment and a receiving coil (1) of the magnetic field immunity capability verification device are coaxial and keep a preset distance;
s2, controlling a radiation coil of the verified magnetic field immunity device to emit an alternating-current magnetic field interference signal with the frequency being the frequency of the test magnetic field and the intensity being the intensity of the test magnetic field;
step S3, starting the magnetic field immunity verification device, selecting the test magnetic field frequency in the step S2 from the magnetic field frequency preset by the singlechip circuit through the touch screen circuit, and reading to obtain a magnetic field strength test result displayed on the touch screen circuit;
and S4, repeatedly executing the steps S1 to S3 according to the combination of each test magnetic field frequency and each test magnetic field intensity required by the verification test so as to measure a magnetic field intensity test result under each test magnetic field frequency, and judging whether the capability of the magnetic field immunity capability verification device is qualified or not based on whether the difference value between the magnetic field intensity test result under each test magnetic field frequency and the test magnetic field intensity is within a preset difference value threshold value.
7. A magnetic field immunity verification method is characterized in that: a magnetic field immunity verification apparatus implementation based on claim 3, comprising:
s1, placing verified magnetic field immunity equipment and a magnetic field immunity capability verification device at a test position so that a radiation coil of the verified magnetic field immunity equipment is coaxial with a symmetry axis (L) of each receiving coil (1) of the magnetic field immunity capability verification device and keeps a preset distance;
s2, controlling a radiation coil of the verified magnetic field immunity device to emit an alternating-current magnetic field interference signal with the frequency being the frequency of the test magnetic field and the intensity being the intensity of the test magnetic field;
step S3, starting the magnetic field immunity verification device, selecting the test magnetic field frequency in the step S2 from the magnetic field frequency preset by the singlechip circuit through the touch screen circuit, and reading to obtain a magnetic field strength test result displayed on the touch screen circuit;
and S4, repeatedly executing the steps S1 to S3 according to the combination of each test magnetic field frequency and each test magnetic field intensity required by the verification test so as to measure a magnetic field intensity test result under each test magnetic field frequency, and judging whether the capability of the magnetic field immunity capability verification device is qualified or not based on whether the difference value between the magnetic field intensity test result under each test magnetic field frequency and the test magnetic field intensity is within a preset difference value threshold value.
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| CN202311741439.5A CN117686959A (en) | 2023-12-18 | 2023-12-18 | Magnetic field immunity verification device and method |
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| CN202311741439.5A CN117686959A (en) | 2023-12-18 | 2023-12-18 | Magnetic field immunity verification device and method |
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| CN117686959A true CN117686959A (en) | 2024-03-12 |
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| CN202311741439.5A Pending CN117686959A (en) | 2023-12-18 | 2023-12-18 | Magnetic field immunity verification device and method |
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