CN214067282U - BCI anti-interference test system - Google Patents
BCI anti-interference test system Download PDFInfo
- Publication number
- CN214067282U CN214067282U CN202022480166.1U CN202022480166U CN214067282U CN 214067282 U CN214067282 U CN 214067282U CN 202022480166 U CN202022480166 U CN 202022480166U CN 214067282 U CN214067282 U CN 214067282U
- Authority
- CN
- China
- Prior art keywords
- power
- electrically connected
- sample
- bci
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a BCI anti-interference test system, including radio frequency signal generator, power amplifier, directional coupler, first attenuator, condenser, surveyed sample and power, wherein, radio frequency signal generator's output port electricity is connected to power amplifier's input port, power amplifier's output port electricity is connected to directional coupler's input port, directional coupler's output port electricity is connected to the one end of first attenuator, the other end electricity of first attenuator is connected to the one end of condenser, the other end electricity of condenser is connected to the measured pencil of being surveyed the sample, the power electricity is connected to being surveyed the sample. Through the utility model discloses an embodiment can be to the test frequency range of high frequency end extension BCI test.
Description
Technical Field
The utility model relates to an electromagnetic compatibility test field, concretely relates to BCI anti-interference test system.
Background
With the development of automobile technology, more and more electronic products are adopted, so that the electromagnetic environment of an automobile is more and more complex, and a complex space electromagnetic field is likely to be coupled into a loop where the electronic product is located through a wire harness connecting the electronic product, thereby affecting the normal operation of the electronic product.
The BCI (Bulk Current Injection) test belongs to one of items of electromagnetic compatibility tests, and aims to test the anti-interference capability of an electronic product on an interference signal coupled to a wire harness. Current BCI testing, such as ISO11452-4, is to clamp a wire harness of a sample under test with an electromagnetic coupling clamp, inject radio frequency interference into the electromagnetic coupling clamp, and monitor the operating conditions of electronic products. Wherein the radio frequency interference is in a beam inductively coupled to the sample under test.
However, the coupling efficiency of the electromagnetic coupling clamp is low at high frequencies (above 500 MHz), so the test frequency range of the BCI test using the electromagnetic coupling clamp is generally limited to between 0.1MHz and 500 MHz. Therefore, it is necessary to design an anti-interference testing system for BCI of automotive electronic products with a wider frequency range.
SUMMERY OF THE UTILITY MODEL
Therefore, it is an object of the present invention to provide a BCI immunity test system, which can at least partially solve the above mentioned problems.
According to an aspect of the present invention, there is provided a BCI immunity test system, including a radio frequency signal generator, a power amplifier, a directional coupler, a first attenuator, a capacitor, a tested sample and a power supply, wherein an output port of the radio frequency signal generator is electrically connected to an input port of the power amplifier, an output port of the power amplifier is electrically connected to an input port of the directional coupler, an output port of the directional coupler is electrically connected to one end of the first attenuator, the other end of the first attenuator is electrically connected to one end of the capacitor, the other end of the capacitor is electrically connected to a tested wire harness of the tested sample, and the power supply is electrically connected to the tested sample.
According to the utility model discloses a test frequency range of BCI test can be expanded to the high frequency end through the condenser to setting up of first attenuator can prevent that reverse standing wave is too big and damage power amplifier.
In some embodiments, the BCI immunity testing system further comprises a first artificial power supply network and a second artificial power supply network, wherein the positive electrode of the power supply is electrically connected to one end of the first artificial power supply network, and the other end of the first artificial power supply network is connected to one end of the sample to be tested through the positive power supply wire of the sample to be tested; the negative electrode of the power supply is electrically connected to one end of the second artificial power supply network, and the other end of the second artificial power supply network is connected to the other end of the tested sample through the negative electrode power line of the tested sample.
In some embodiments, further comprising a forward power meter and a reverse power meter, wherein the forward power meter is electrically connected to the forward power monitoring port of the directional coupler; the reverse power meter is electrically connected to the reverse power monitoring port of the directional coupler.
In some embodiments, the sample being tested is a car light.
In some embodiments, the BCI immunity test system further includes a photoelectric conversion transmitting module, a photoelectric conversion receiving module, and an oscilloscope, wherein the photoelectric conversion transmitting module is aligned with the sample to be tested and is electrically connected to one end of the photoelectric conversion receiving module, and the other end of the photoelectric conversion receiving module is electrically connected to the oscilloscope.
In some embodiments, the frequency of the signal allowed to pass by the capacitor ranges from 1MHz to 2 GHz.
Drawings
The above features, technical features, advantages and modes of realisation of the present invention will be further explained in the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings, wherein,
fig. 1 is a schematic circuit connection diagram of a BCI immunity test system 100 according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit connection for calibrating the BCI immunity test system 100.
Detailed Description
Embodiments of the present invention are exemplarily described below. As those skilled in the art will appreciate, the illustrated embodiments may be modified in various different ways without departing from the inventive concept. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive. In the following, the same reference numbers generally indicate functionally identical or similar elements.
According to the present general inventive concept, there is provided a BCI immunity test system, including a radio frequency signal generator, a power amplifier, a directional coupler, a first attenuator, a capacitor, a tested sample and a power supply, wherein an output port of the radio frequency signal generator is electrically connected to an input port of the power amplifier, an output port of the power amplifier is electrically connected to an input port of the directional coupler, an output port of the directional coupler is electrically connected to one end of the first attenuator, the other end of the first attenuator is electrically connected to one end of the capacitor, the other end of the capacitor is electrically connected to a tested wire harness of the tested sample, and the power supply is electrically connected to the tested sample.
Fig. 1 shows a schematic circuit connection diagram of a BCI immunity test system 100 according to an embodiment of the present invention. As shown in fig. 1, the BCI immunity test system 100 includes a radio frequency signal generator 4, a power amplifier 5, a directional coupler 6, a first attenuator 7, a capacitor 8, a sample 2 to be tested, a first artificial power supply network 15, a second artificial power supply network 16, a power supply 3, and a monitoring component for detecting a change in the sample 2 to be tested, a forward power meter 12, a reverse power meter 13, and a controller 14.
Wherein, the output port of the radio frequency signal generator 4 is connected to the input port of the power amplifier 5, the output port of the power amplifier 5 is connected to the input port of the directional coupler 6, the forward power monitoring port of the directional coupler 6 is connected to one end of the forward power meter 12, the reverse power monitoring port of the directional coupler 6 is connected to one end of the reverse power meter 13, the output port of the directional coupler 6 is connected to one end of the first attenuator 7, the other end of the first attenuator 7 is connected to one end of the capacitor 8, the other end of the capacitor 8 is connected to the testing position point 20 of the positive power line (i.e. the tested wire harness) of the tested sample 2, the positive power line of the tested sample 2 is connected to one end of the first artificial power network 15, the negative power line of the tested sample 2 is connected to one end of the second artificial power network 16, the other ends of the first artificial power network 15 and the second artificial power network 16 are respectively connected to the positive pole and the negative pole of the power source 3, and the negative pole of the power supply 3 is grounded, and in addition, the communication port of the radio frequency signal generator 4, the communication port of the power amplifier 5, the other end of the forward power meter 12 and the other end of the reverse power meter 13 are all connected to the controller 14.
The monitoring assembly for detecting the change of the detected sample 2 comprises a photoelectric conversion sending module 9, a photoelectric conversion receiving module 10 and an oscilloscope 11, wherein the photoelectric conversion sending module 9 is aligned to the detected sample 2 and is connected to one end of the photoelectric conversion receiving module 10, the other end of the photoelectric conversion receiving module 10 is connected to one end of the oscilloscope 11, and a communication port of the oscilloscope 11 is connected to the controller 14.
It should be noted that, in the embodiments of the present invention, all references to "connected" refer to direct or indirect electrical connection, and do not include coupling connection based on electromagnetic coupling.
The first attenuator 7, the capacitor 8, the sample 2 to be detected, the photoelectric conversion sending module 9, the first artificial power network 15, the second artificial power network 16 and the power supply 3 are located in the shielding chamber 1, and damage to a human body and other equipment caused by radio frequency radiation leakage is avoided.
Wherein the radio frequency signal generator 4 is used for generating a radio frequency interference signal. In one non-limiting example, it may generate radio frequency interference signals with frequencies in the range of 9KHz to 3.2GHz and powers in the range of-145 dBm to +18 dBm. In a non-limiting example, the output port of the radio frequency signal generator 4 is connected to the input port of the power amplifier 5 by a coaxial cable.
Wherein the power amplifier 5 is used for amplifying the power of the radio frequency interference signal generated by the radio frequency signal generator 4. In one non-limiting example, the operating frequency may be in the range of 4KHz to 2GHz, and the gain may be 51 dB. In one non-limiting example, the output port of the power amplifier 5 is connected to the input port of the directional coupler 6 by a coaxial cable.
The directional coupler 6 is used for sampling the radio frequency interference signal to measure the power. In one non-limiting example, the operating frequency of the directional coupler 6 may be in the range of 4KHz to 2GHz, and the degree of coupling may be above 40 dB.
Wherein, the forward power meter 12 is used for measuring the forward power of the directional coupler 6, and the reverse power meter is used for measuring the reverse power of the directional coupler 6. In one non-limiting example, forward power meter 12 and reverse power meter 13 may measure radio frequency interference signals having frequencies in the range of 8KHz to 6GHz and powers in the range of-70 dBm to +23 dBm. In one non-limiting example, the forward power meter 12 and the reverse power meter 13 have an N-type connection for connecting to the directional coupler 6 and a USB terminal for connecting to the controller 14.
Wherein the first attenuator 7 is used to prevent the reverse standing wave from being too large and damaging the power amplifier 5. In one non-limiting example, the first attenuator 7 may operate over a frequency range of 0 to 2.4GHz and may have an attenuation of 6 dB. In one non-limiting example, the first attenuator 7 may be connected to the capacitor 8 by a coaxial cable.
The capacitor 8 is electrically connected with the sample 2, so that the radio frequency interference signal is directly transmitted to the beam of the sample 2 after passing through the capacitor 8, rather than being inductively coupled to the beam of the sample 2 by an electromagnetic coupling clamp as in the prior art. In a non-limiting example, to achieve a direct electrical connection between the capacitor 8 and the sample 2 under test, it is necessary to peel off the insulating sheath at the location under test of the wire harness under test of the sample 2 under test and clamp one end of the capacitor 8 at that location.
In one example, different BCI test frequency ranges may be obtained by selecting different capacitors 8. For example, but not limiting of, where the frequency range of the signals that can be passed by the capacitor 8 is 1MHz to 2GHz, the test frequency of the BCI test may be extended to 2 GHz.
The sample 2 may be any electronic product, such as, but not limited to, a car light. Although fig. 1 shows a case where the capacitor 8 is electrically connected to the positive power supply line of the sample 2, that is, the bundle of the sample 2 is a positive power supply line, the bundle of the sample may be another bundle such as a negative power supply line or a signal line, and in this case, the capacitor 8 may be electrically connected to another bundle of the sample 2.
The power supply 3 is a dc power supply for supplying electric energy to the sample 2, and its positive electrode and negative electrode are connected to the sample 2 through a first artificial power supply network 15 and a second artificial power supply network 16, respectively. The first artificial power supply network 15 and the second artificial power supply network 16 are used to prevent radio frequency interference signals from entering the power supply system and to provide a stable loop impedance.
Under the condition that the detected sample 2 is a car lamp, the photoelectric conversion sending module 9 is used for receiving light emitted by the detected sample 2, determining light intensity and sending a light intensity signal to the photoelectric conversion receiving module 10, the photoelectric conversion receiving module 10 is used for converting the light intensity signal into a voltage signal and sending the voltage signal to the oscilloscope 11, and the oscilloscope 11 can read and display an effective value of the voltage signal.
Wherein the controller 14 is configured to adjust the output power of the rf signal generator 4 according to the power value determined in the calibration phase. In one example, for each test frequency of the radio frequency interference signal, a forward power value of the radio frequency interference signal satisfying a specific test level is determined in the calibration stage, and then the controller 14 may adjust the output power of the radio frequency signal generator 4 until the measurement value of the forward power meter 12 is equal to the forward power value. In another example, for each test frequency of the radio frequency interference signal, the output power value of the radio frequency signal generator 4 satisfying a specific test level is determined in the calibration stage, and then the controller 14 may directly adjust the output power of the radio frequency signal generator 4 to the output power value.
In addition, the controller 14 can also determine the voltage change percentage, i.e. the ratio of the change of the voltage in the presence of the radio frequency interference relative to the initial voltage in the absence of the radio frequency interference to the initial voltage, according to the reading of the oscilloscope 11, and determine whether the BCI test of the measured wire harness is qualified. For example, the initial value of the voltage is 2V, if the variation range of the voltage is between 1.4V and 2.6V (namely, the variation percentage of the voltage is less than or equal to 30%), the BCI test is qualified, and if the variation range is exceeded, the BCI test is unqualified.
It should be noted that the controller 14 and the monitoring assembly for detecting a change in the vehicle lamp may be used in accordance with the ISO11452-4 test standard. In addition, the controller 14 is not necessary, and may adjust the output power of the rf signal generator 4 manually and determine whether the BCI test is qualified.
It should be noted that the monitoring component for detecting the change of the sample 2 is not limited to include the photoelectric conversion transmitting module 9, the photoelectric conversion receiving module 10 and the oscilloscope 11, and when the sample 2 is an electronic product other than a car lamp, the monitoring component for detecting the change of the sample 2 may include other modules, or may be eliminated and the detection is performed manually.
As described above, the BCI immunity test system 100 needs to be calibrated before testing, and fig. 2 shows a schematic circuit connection diagram for calibrating the BCI immunity test system 100, and in the calibration stage, for each test frequency of the rf interference signal and a specific test level, the output power, or forward power, etc. of the rf signal generator for generating the rf interference signal needs to be determined.
As shown in fig. 2, in the calibration phase, the sample 2 under test is replaced by a load 19, and the power supply 3 and the monitoring components are removed, in particular, the other end of the capacitor 8 is connected (for example, but not limited to, by a T-connector) to one end of a second attenuator 18 and the load 19, the other end of the second attenuator 18 is connected to one end of the calibration power meter 17, the other end of the load 19 is connected to ground, and the other end of the calibration power meter 17 is connected to the controller 14.
Therein, the calibration power meter 17 is used to measure the power of the radio frequency interference signal passing through the capacitor 8. In one non-limiting example, the calibration power meter 17 may measure radio frequency interference signals having frequencies in the range of 8KHz to 6GHz and powers in the range of-70 dBm to +23 dBm.
Wherein the second attenuator 18 is used to prevent the reverse standing wave from being too large and damaging the calibration power meter 17. In one non-limiting example, the second attenuator 18 may operate over a frequency range of 0 to 2.4GHz and may have an attenuation of 20 dB.
In the calibration phase, the calibration may be performed according to the following calibration steps:
1. calculating a calibration power value for a test frequency point;
Pcalibrating power valuesI × 50, where I is a test level, e.g., when the test level is 200mA, the calibration power value is 2W;
2. adjusting the output of the radio frequency signal generator 4 until the reading of the calibration power meter 17 is equal to the calibration power value, and recording the output power, the forward power value and the reverse power value of the radio frequency signal generator 4 at the moment;
this step may be performed by the controller 14, or may be performed manually;
3. adjust to the next testing frequency point and repeat step 2.
According to the embodiment of the present invention, by directly electrically connecting the capacitor 8 to the measured harness of the measured sample 2, the test frequency of the BCI test can be extended by using the on-high frequency characteristic of the capacitor 8; by connecting the first attenuator 7 between the directional coupler 6 and the capacitor 8, it is possible to avoid that the reverse standing wave is too large and damages the power amplifier 5.
The present invention is not limited to the above configuration, and various other modifications may be adopted. While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as disclosed herein. Accordingly, the scope of the present invention should be limited only by the attached claims.
Claims (7)
1. A BCI immunity test system (100) is characterized by comprising a radio frequency signal generator (4), a power amplifier (5), a directional coupler (6), a first attenuator (7), a capacitor (8), a tested sample (2) and a power supply (3),
an output port of the radio frequency signal generator (4) is electrically connected to an input port of the power amplifier (5), an output port of the power amplifier (5) is electrically connected to an input port of the directional coupler (6), an output port of the directional coupler (6) is electrically connected to one end of the first attenuator (7), the other end of the first attenuator (7) is electrically connected to one end of the capacitor (8), the other end of the capacitor (8) is electrically connected to a measured wire harness of the measured sample (2), and the power supply (3) is electrically connected to the measured sample (2).
2. The BCI immunity testing system (100) of claim 1, wherein said bundle under test includes at least one of a positive power line, a negative power line, a signal line.
3. The BCI immunity testing system (100) of claim 1, further comprising a first artificial power network (15) and a second artificial power network (16), wherein,
the positive electrode of the power supply (3) is electrically connected to one end of the first manual power supply network (15), and the other end of the first manual power supply network (15) is connected to one end of the sample to be measured (2) through the positive electrode power supply wire of the sample to be measured (2);
the negative pole of the power supply (3) is electrically connected to one end of the second artificial power supply network (16), and the other end of the second artificial power supply network (16) is connected to the other end of the tested sample (2) through the negative pole power supply line of the tested sample (2).
4. The BCI immunity test system (100) of claim 1, further comprising a forward power meter (12) and a reverse power meter (13), wherein,
the forward power meter (12) is electrically connected to a forward power monitoring port of the directional coupler (6);
the reverse power meter (13) is electrically connected to a reverse power monitoring port of the directional coupler (6).
5. The BCI immunity test system (100) of claim 1, wherein said sample under test (2) is a car light.
6. The BCI immunity test system (100) of claim 5, further comprising a photoelectric conversion transmitting module (9), a photoelectric conversion receiving module (10), and an oscilloscope (11), wherein,
the photoelectric conversion sending module (9) is aligned with the tested sample (2) and is electrically connected to one end of the photoelectric conversion receiving module (10), and the other end of the photoelectric conversion receiving module (10) is electrically connected to the oscilloscope (11).
7. The BCI immunity test system (100) of claim 1, wherein said capacitor (8) allows signals to pass through in a frequency range of 1MHz to 2 GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022480166.1U CN214067282U (en) | 2020-10-29 | 2020-10-29 | BCI anti-interference test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022480166.1U CN214067282U (en) | 2020-10-29 | 2020-10-29 | BCI anti-interference test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214067282U true CN214067282U (en) | 2021-08-27 |
Family
ID=77400381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022480166.1U Active CN214067282U (en) | 2020-10-29 | 2020-10-29 | BCI anti-interference test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214067282U (en) |
-
2020
- 2020-10-29 CN CN202022480166.1U patent/CN214067282U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110672931A (en) | Electromagnetic pulse radiation field test probe, test system and test method | |
| CN111289786B (en) | Probe interface circuit and probe adapter circuit for probe of oscilloscope | |
| CN109884407B (en) | Electromagnetic shielding effectiveness measuring system and measuring method | |
| CN104459348A (en) | Software-defined radio based high-power microwave radiation field measuring device and method | |
| CN110988774A (en) | Calibration method and system of electromagnetic pulse electric field probe | |
| CN113765601B (en) | Standing wave detection calibration device and method for short wave transmitter | |
| CN214067282U (en) | BCI anti-interference test system | |
| CN109782101B (en) | Calibration device and calibration method for automobile electronic conduction immunity test | |
| Lim et al. | Design and test of an electric field sensor for the measurement of high-voltage nanosecond pulses | |
| CN211856738U (en) | Electromagnetic pulse radiation field test probe and test system | |
| CN209946282U (en) | A calibration equipment for automotive electronics conduction noise immunity test | |
| CN210665892U (en) | Portable ultra-fast transient high-frequency electric field measurement system | |
| AU2021244530A1 (en) | Instrument interface method and device | |
| Silaghi et al. | Emissions and Immunity EMC Testing at Continental Automotive Timişoara | |
| Wu et al. | The Effect of Nonlinear Characteristics of an Electric Field Probe on Detection Response to OFDMA Signal | |
| CN215833539U (en) | Switch cabinet transient ground signal acquisition device | |
| Prajapati et al. | Extraction of equivalent impedance of photovoltaic panel under its actual operating conditions | |
| CN114720794B (en) | Electronic equipment antenna feeder unit testing device and method based on space radiation | |
| Chai et al. | An Electric Field Probe for Wide-Band Intense Radiation Field Measurement | |
| Escurra et al. | IEC 60270 Calibration Uncertainty in Gas-Insulated Substations | |
| CN219979817U (en) | Active antenna | |
| CN216560814U (en) | Current transformer once inclines equipotential point nondestructive test device | |
| CN215986347U (en) | Switch cabinet partial discharge detection circuit and detection system | |
| CN212749037U (en) | Insertion loss measuring device | |
| CN114325173B (en) | Universal testing device and method for spacecraft system-level electromagnetic radiation emission |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |