CN209946282U - A calibration equipment for automotive electronics conduction noise immunity test - Google Patents
A calibration equipment for automotive electronics conduction noise immunity test Download PDFInfo
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- CN209946282U CN209946282U CN201920315034.8U CN201920315034U CN209946282U CN 209946282 U CN209946282 U CN 209946282U CN 201920315034 U CN201920315034 U CN 201920315034U CN 209946282 U CN209946282 U CN 209946282U
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Abstract
The utility model relates to a test technical field provides a calibration equipment for automotive electronics conduction noise immunity test. The utility model provides a calibration equipment for automotive electronics conduction immunity test, includes signal generator, enlargies module, perception coupling pincers, matching module, measuring module, transmission module and frock clamp, and frock clamp is used for the fixed tool that supports transmission module and for connecting transmission module and matching module, and interference signal generation module injects disturbance current to perception coupling pincers, through the mode of magnetic induction coupling, checks the induced-current that produces on the transmission line. The utility model discloses a calibration equipment for automotive electronics conduction noise immunity test can guarantee the reliability and the stability of test, and maneuverability is big, and repeatability is strong, and economy simple accurate has simple structure stability, saves the advantage of time cost.
Description
Technical Field
The utility model relates to a test technical field, more specifically relates to a calibration equipment for automotive electronics conduction noise immunity test.
Background
Various wire harnesses connected to an automobile become a passive receiving antenna network during the operation of electronic equipment, induced voltage or current is easily generated under the action of an external electromagnetic field, and a large part of the electromagnetic field in the space is subjected to magnetic induction coupling through bundled cable wire harnesses to cause interference to vehicle-mounted electronic parts/modules. The purpose of the conducted immunity test is to verify whether the automobile electronic parts/modules can normally work to reach the expected performance state or execute the expected design function when being interfered by the radio frequency electromagnetic energy coupled by the cable harness, and qualitatively inspect the anti-interference capability of the automobile electronic parts/modules.
At present, in international and national standards of an automobile electromagnetic compatibility detection technology, the verification of conducted immunity test is to measure interference coupling current by using precision equipment such as an attenuator, a power probe, a power meter and the like.
However, the above prior art scheme has high cost, relatively complex and tedious system connection, needs to spend a lot of time for checking and verifying the test system, and is not easy to be noticed when the precision equipment is damaged, thereby easily causing the deviation of the test result.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above problem, provide a calibration equipment for automotive electronics conduction noise immunity test, realize the check-up to automotive electronics conduction noise immunity test.
The utility model adopts the technical proposal that:
a calibration device for testing the electronic conduction immunity of an automobile comprises a signal generator 1, an amplifying module 2, an inductive coupling clamp 3, a matching module 4, a measuring module 5, a transmission module 6 and a tool clamp 7, wherein the tool clamp 7 is used for fixedly supporting the transmission module 6 and is a jig for connecting the transmission module 6 and the matching module 4;
the output end of the signal generator 1 is connected with the amplifying module 2, the output end of the amplifying module 2 is connected with the inductive coupling clamp 3, and the signal generator 1, the amplifying module 2 and the inductive coupling clamp 3 form an interference signal generating module;
the transmission module 6 comprises an adapter 61, a transmission probe 62 and a short circuit cap 63, the inductive coupling clamp 3 surrounds the transmission probe 62, one end of the transmission probe 62 is connected with the short circuit cap 63, the other end of the transmission probe 62 is connected with the matched load 4 through the adapter 61, and the matched load 4 is further connected with the measurement module 5; the matched load 4, the measuring module 5, the adapter 61 and the short-circuiting cap 63 are connected to the same ground potential;
the matched load 4, the measuring module 5 and the transmission probe 62 form an induction signal receiving module;
the interference signal generating module injects interference signals into the inductive coupling clamp 3, an inductive loop is formed by the transmission line and the matched load, and signal acquisition and measurement are carried out through the measuring module.
Optionally, the amplifying module 2 is a power amplifier.
Optionally, the inductive coupling clamp 3 is a current injection probe.
Optionally, the matching module 4 is a 50 ohm termination matched load.
Optionally, the measuring module 5 is a pointer voltmeter.
Compared with the prior art, the beneficial effects are:
(1) the calibration device realizes calibration of the automobile conduction anti-interference test through the signal generator, the power amplifier, the 50-ohm terminal matching load, the high-precision pointer type voltmeter, the inductive coupling clamp and the like, can effectively control the measurement deviation caused by the connection error of a complex test system, and has the advantages of simple system structure, strong operability and low cost.
(2) The method aims at the characteristics of a 50-ohm wire harness impedance system of an automobile to verify the interference current generated by the inductive coupling clamp, and fully considers the transmission line principle and the impedance matching problem, so that the accuracy, reliability and stability of the verification test are ensured.
Drawings
Fig. 1 is a block diagram of a calibration apparatus for testing conducted immunity of automotive electronics according to the present invention;
the positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention. For a better understanding of the embodiments or aspects of the invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. It will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Detailed Description
The invention will be further described with reference to the following figures and examples:
embodiments of the invention are illustrated in the drawings, in which like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The description with reference to the drawings is only intended to illustrate the invention and should not be taken as limiting the invention.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be understood in a broad sense, and may be, for example, directly connected or indirectly connected through an adapter. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
As shown in fig. 1, a calibration apparatus for testing the conducted noise immunity of an automobile electronic device includes a signal generator 1, an amplifying module 2, an inductive coupling clamp 3, a matching module 4, a measuring module 5, a transmission module 6 and a tooling fixture 7, wherein the tooling fixture 7 is used for fixedly supporting the transmission module 6 and is a fixture for connecting the transmission module 6 and the matching module 4.
The output end of the signal generator 1 is connected with the amplifying module 2, the output end of the amplifying module 2 is connected with the inductive coupling clamp 3, and the signal generator 1, the amplifying module 2 and the inductive coupling clamp 3 form an interference signal generating module. The transmission module 6 comprises an adapter 61, a transmission probe 62 and a short circuit cap 63, the inductive coupling clamp 3 surrounds the transmission probe 62, one end of the transmission probe 62 is connected with the short circuit cap 63, the other end of the transmission probe is connected with the matched load 4 through the adapter 61, and the matched load 4 is also connected with the measurement module 5. The matching load 4, the measuring module 5, the adapter 61 and the short-circuiting cap 63 are connected to the same ground potential. The matched load 4, the measurement module 5 and the transmission probe 62 constitute an inductive signal receiving module. The interference signal generating module is used for injecting interference signals into the inductive coupling clamp 3, forming an inductive loop through the transmission line and the matched load, and carrying out signal acquisition and measurement through the measuring module.
Optionally, the amplifying module 2 is a power amplifier.
Optionally, the inductive coupling clamp 3 is a current injection probe.
Optionally, the matching module 4 matches the load for a 50 ohm termination.
Optionally, the measurement module 5 is a high-precision pointer voltmeter.
The following provides a specific embodiment of the testing process of the calibration apparatus for testing the conducted immunity of automotive electronics of the present invention.
In the embodiment, the output end of the signal generator 1 is connected with a power amplifier, the output end of the power amplifier is connected with a current injection probe, the current injection probe surrounds a transmission probe 62, one end of the transmission probe 62 is connected with a short circuit cap 63, the other end of the transmission probe is connected with a 50 ohm terminal matching load through an adapter 61, and the 50 ohm terminal matching load is connected with a high-precision pointer type voltmeter.
The signal generator 1, the power amplifier and the current injection probe constitute an interference signal generation module.
The 50 ohm terminal matching load, the high-precision pointer voltmeter and the transmission probe 62 form an induction signal receiving module, and an induction loop is formed by the transmission probe 62 and the 50 ohm terminal matching load.
The 50 ohm termination matched load, high precision pointer voltmeter, adapter 61 and shorting cap 63 are connected to common ground on the hardware connection.
In this embodiment, a signal output by the signal generator 1 is amplified by a power amplifier and then injected into the current injection probe, an induced current is generated on the transmission probe 62 through the magnetic induction coupling between the current injection probe and the transmission probe 62, and the induced current is connected by the short cap 63 to form a loop and consumed at a 50 ohm terminal matching load. The high-precision pointer type voltmeter is adopted for collection and measurement, and the forward power required by reaching a set interference current level is verified by adjusting the signal size and the power amplifier output.
In order to reduce standing waves, avoid energy loss or distortion caused by reflection of radio waves or signal reflection oscillation in a transmission path and guarantee the maximum power of a transmission line, in the signal transmission of input and output of each subsystem, the structural characteristics of a 50-ohm radio frequency coaxial cable and a 50-ohm radio frequency adapter are utilized, namely an outer cylindrical mesh conductive layer (shielding layer) and a central shaft inner conductor core wire (transmission layer) are separated by a plastic insulating material, the distance between the two is ensured to be consistent when the signals are transmitted, a current loop is formed between the transmission layer and the shielding layer, and the impedance of the transmission layer relative to the shielding layer is 50 ohms, so that the input and output of the system keep 50-ohm characteristic impedance matching.
In order to realize decoupling effect and avoid interference signals from forming crosstalk through a feeder line and a ground loop, a shielding layer of a coaxial cable is connected with a grounding flat plate of a test table at a low resistance, at the moment, the shielding layer of the coaxial cable is connected with an input/output radio frequency port of equipment in a test system through an adapter of a metal shell, so that the coaxial cable, the grounding flat plate, a shielding chamber shell and a system grounding point are grounded together, and the low-resistance connection is realized when the grounding resistance value is less than 2.5 milliohms.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Variations or modifications in other variations may occur to those skilled in the art upon reading the foregoing description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. A calibration device for testing the electronic conduction immunity of an automobile is characterized by comprising a signal generator (1), an amplifying module (2), an inductive coupling clamp (3), a matching module (4), a measuring module (5), a transmission module (6) and a tool clamp (7), wherein the tool clamp (7) is used for fixedly supporting the transmission module (6) and is a jig for connecting the transmission module (6) and the matching module (4);
the output end of the signal generator (1) is connected with the amplification module (2), the output end of the amplification module (2) is connected with the inductive coupling clamp (3), and the signal generator (1), the amplification module (2) and the inductive coupling clamp (3) form an interference signal generation module;
the transmission module (6) comprises an adapter (61), a transmission probe (62) and a short circuit cap (63), the inductive coupling clamp (3) surrounds the transmission probe (62), one end of the transmission probe (62) is connected with the short circuit cap (63), the other end of the transmission probe is connected with the matching module (4) through the adapter (61), and the matching module (4) is also connected with the measurement module (5); the matching module (4), the measuring module (5), the adapter (61) and the short-circuit cap (63) are connected to the same ground potential;
the matching module (4), the measuring module (5) and the transmission probe (62) form an induction signal receiving module;
the interference signal generating module injects interference signals into the inductive coupling pliers (3), an inductive loop is formed by the transmission line and the matched load, and signal acquisition and measurement are carried out through the measuring module.
2. A verification device for automotive electronics conducted immunity test according to claim 1, characterized in that the amplification module (2) is a power amplifier.
3. A verification device for automotive electronics conduction immunity test according to claim 1, characterized in that the inductive coupling clamp (3) is a current injection probe.
4. A verification device for automotive electronics conducted immunity test, according to claim 1, characterized in that said matching module (4) matches the load for a 50 ohm termination.
5. The verification device for the automobile electronic conduction immunity test is characterized in that the measurement module (5) is a pointer type voltmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920315034.8U CN209946282U (en) | 2019-03-13 | 2019-03-13 | A calibration equipment for automotive electronics conduction noise immunity test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920315034.8U CN209946282U (en) | 2019-03-13 | 2019-03-13 | A calibration equipment for automotive electronics conduction noise immunity test |
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| CN209946282U true CN209946282U (en) | 2020-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782101A (en) * | 2019-03-13 | 2019-05-21 | 海检检测有限公司 | A kind of calibration equipment and method of calibration for the test of automotive electronics conducted immunity |
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2019
- 2019-03-13 CN CN201920315034.8U patent/CN209946282U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782101A (en) * | 2019-03-13 | 2019-05-21 | 海检检测有限公司 | A kind of calibration equipment and method of calibration for the test of automotive electronics conducted immunity |
| CN109782101B (en) * | 2019-03-13 | 2021-09-24 | 海检检测有限公司 | Calibration device and calibration method for automobile electronic conduction immunity test |
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