CN214041590U

CN214041590U - Electromagnetic compatibility test tool for LVDS signal equipment

Info

Publication number: CN214041590U
Application number: CN202023100722.4U
Authority: CN
Inventors: 李英炎
Original assignee: Beijing Jingwei Hirain Tech Co Ltd
Current assignee: Beijing Jingwei Hirain Tech Co Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-08-24
Anticipated expiration: 2030-12-21

Abstract

The utility model provides an electromagnetic compatibility test fixture of LVDS signalling equipment, include: a shielding box; and a radio frequency connector located on a side of the shielding box. One connection end of the radio frequency connector is located inside the shielding box, and the other connection end is located outside the shielding box. The utility model discloses a radio frequency connector switches camera or screen to the shielded cell in, and the LVDS signal equipment of being tested is put and is tested inside the anechoic chamber, can arouse the peripheral hardware of influence to radiation emission test and anti-interference test like this and all place at the shielded cell, and the received noise of test antenna is whole to be come from the LVDS signal equipment of being tested, has guaranteed the actual noise size of the LVDS signal equipment of being tested of accurate measurement. The radio frequency connector does not need to be customized, is low in cost, does not cause the extension of the development period, further reduces the cost and meets the normal development of products.

Description

Electromagnetic compatibility test tool for LVDS signal equipment

Technical Field

The utility model relates to an electromagnetic compatibility test field, more specifically say, relate to an LVDS signalling equipment's electromagnetic compatibility test fixture.

Background

LVDS (Low-Voltage differential signaling) signaling devices are devices that communicate based on LVDS signals. LVDS signaling devices include cameras, screens, etc., and are increasingly used in automobiles. Specifically, a driver monitoring System, an ADAS (Advanced Driving Assistance System), an automatic parking System, and the like of an automobile use a large number of cameras.

Because of the complex electromagnetic environment of automobiles, various parts of automobiles are required to meet international standards and various vehicle-to-enterprise standards. For a controller connected with a camera or a screen, an existing test scheme is that the tested controller is connected with the camera or the screen through a coaxial line to be used as a system for testing; however, as the camera or the screen needs to communicate with the controller through the LVDS signals, when the controller is subjected to the electromagnetic compatibility test, much noise from the camera and the screen cannot be effectively eliminated, and the anti-interference test cannot determine whether the controller is interfered or the camera or the screen is interfered.

To the controller that is connected with camera or screen, a current test scheme is, through the opto-coupler isolation, places camera or screen outside the darkroom, and the test can guarantee like this by test equipment and camera or screen effective separation, and the reason place can both effectually be distinguished in radiation and anti-interference test. However, the optical coupler isolation scheme needs to be customized, the cost is high, the period for customizing the optical coupler is long, the development period is prolonged, and the normal development of products cannot be met.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an Electromagnetic Compatibility test fixture of LVDS signal equipment, through radio frequency connector with camera or screen switching to the shielded cell in, and then on the basis of reduce cost, the better EMC (Electromagnetic Compatibility) problem of LVDS signal equipment under test of location.

In order to achieve the above object, the following solutions are proposed:

the utility model provides an electromagnetic compatibility test fixture of LVDS signalling equipment, includes:

a shielding box; and the number of the first and second groups,

a radio frequency connector located on a side of the shielding box; one connecting end of the radio frequency connector is positioned inside the shielding box, and the other connecting end of the radio frequency connector is positioned outside the shielding box.

Optionally, the number of the radio frequency connectors is multiple.

Optionally, the radio frequency connector specifically includes: SMA connectors or N-type connectors.

Optionally, the electromagnetic compatibility test fixture of LVDS signalling device still includes: a fiber optic connector located on a side of the shielded enclosure; one connecting end of the optical fiber connector is positioned inside the shielding box, and the other connecting end is positioned outside the shielding box.

Optionally, the optical fiber connector includes: an optical fiber ST connector and/or an optical fiber FC connector.

Optionally, the shielding box includes: the box body 9 and the upper cover 12 are made of conductive materials, one sides of the box body 9 and the upper cover 12 are hinged, and the other sides of the box body 9 and the upper cover 12 are provided with mutually matched clamping devices 11.

Optionally, the conductive material specifically includes: stainless steel.

Optionally, the clamping device 10 specifically includes: and (5) buckling.

Optionally, the electromagnetic compatibility test fixture of LVDS signalling device still includes: and the filler 10 is arranged between the box body 9 and the upper cover 12, and the material of the filler 10 is a conductive material.

Optionally, the filler 10 includes: conductive foam and copper mesh.

Compared with the prior art, the technical scheme of the utility model have following advantage:

the electromagnetic compatibility test fixture of LVDS signal equipment that above-mentioned technical scheme provided includes: a shielding box; and a radio frequency connector located on a side of the shielding box. One connection end of the radio frequency connector is located inside the shielding box, and the other connection end is located outside the shielding box. The utility model discloses a radio frequency connector switches camera or screen to the shielded cell in, the LVDS signal equipment of being tested is put and is tested inside the anechoic chamber, the peripheral hardware that can arouse the influence to radiation emission test and anti-interference test like this all places at the shielded cell in, the received noise of test antenna is whole to be come from the LVDS signal equipment of being tested, the actual noise size of the LVDS signal equipment of being tested of accurate measurement has been guaranteed, the effectual EMC problem of being tested LVDS signal equipment that has fixed a position. The radio frequency connector does not need to be customized, is low in cost, does not cause the extension of the development period, further reduces the cost and meets the normal development of products.

Furthermore, still at the optical line connector of the side setting of shielded cell, and then can be at shielded cell internally mounted monitoring camera to the display screen of the inside screen of monitored shielded cell reaches real time monitoring's purpose.

Furthermore, the box body and the upper cover of the shielding box are made of stainless steel materials, so that the shielding box is good in surface conductivity and not prone to deformation and oxidation.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electromagnetic compatibility testing tool for LVDS signaling equipment according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an LVDS signaling device according to an embodiment of the present invention when performing a radiation emission test;

fig. 3 is a schematic structural diagram of an electromagnetic compatibility testing tool of another LVDS signaling device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, an electromagnetic compatibility testing tool for an LVDS signaling device provided in this embodiment includes: a shielding box A and a radio frequency connector B. The radio frequency connector B is positioned on the side surface of the shielding box A; one connection end of the radio frequency connector B is located inside the shielding box a, and the other connection end is located outside the shielding box a. The camera and/or the screen of the LVDS signal device to be tested are/is transferred to the interior of the shielding box A through the radio frequency connector, and therefore the EMC problem of the LVDS signal device is better positioned. The utility model provides a LVDS signal device is for carrying out the controller that communicates based on LVDS signal and equipment such as camera and/or screen.

The working principle of the LVDS signaling device is as follows:

camera → controller: the controller configures the camera through an I2C bus; after the camera collects image information, the image information is transmitted to the serial chip; the serial chip converts the parallel signals into serial signals, namely LVDS signals, and transmits the LVDS signals to the deserializing chip of the controller through the LVDS cable, and the deserializing chip converts the serial signals into parallel signals and transmits the parallel signals to the data processing chip.

Controller → screen: the controller sends the parallel signals to the serial chip, and the serial chip converts the parallel signals into serial signals, namely LVDS signals; the serial chip converts the parallel signals into LVDS signals and then transmits the LVDS signals to a deserializing chip of the screen controller through a coaxial line, and the deserializing chip converts the serial signals into the parallel signals and then sends the parallel signals to an image processor and then displays image information on a screen.

Fig. 2 shows a schematic diagram of an LVDS signaling device under a radiation emission test. The tested sample (i.e. the tested LVDS signal device) is placed in the anechoic chamber 21, and the radiation emission tests the amount of energy radiated from the tested sample. The DUT in FIG. 2 is called Device under test, i.e. the sample to be measured. The Load box is an inactive device Load of the DUT, such as a switch, a resistor, a capacitor, and so on. Active devices such as a camera and/or a screen are arranged in the shielding box, external equipment which easily causes radiation emission and anti-interference problems is easily arranged, and a tested sample is a Battery which supplies power to a Load box and a DUT (device under test) through an LISN (artificial power supply network). An Antenna is located at a position 1m directly in front of the wire harness, and transmits a received signal to a receiver.

In some embodiments, a plurality of rf connectors B may be disposed on the side of the shielding box a; like this to the LVDS signalling equipment that is connected with a plurality of cameras, be connected with the LVDS signalling equipment of a plurality of screens to and the LVDS signalling equipment who is connected with camera and screen simultaneously, all can use the utility model provides an LVDS signalling equipment's electromagnetic compatibility test fixture tests.

The radio frequency connector B may specifically be: SMA connectors or N-type connectors. The SMA connector is a miniature coaxial connector. The SMA connector comprises a positive SMA male head, a positive SMA female head, a reverse SMA male head, a reverse SMA female head and the like, which are respectively expressed as SMA-J, SMA-K, RP-SMA-J and RP-SMA-K in corresponding English. In the electromagnetic compatibility testing tool for the LVDS signaling device in the embodiment, a plurality of types of SMA connectors may be disposed on the side surface of the shielding box a to expand the application range.

The utility model provides an electromagnetic compatibility test fixture of LVDS signal equipment, can also set up the fiber connector in the side of shielded cell A; one connection end of the optical fiber connector is located inside the shielded box a, and the other connection end is located outside the shielded box a. Can be at shielding case A internally mounted surveillance camera head like this to transmit the image transmission that surveillance camera head gathered to the outside display device of anechoic chamber through fiber connector, with the display screen of the inside screen of monitoring shielding case A, reach real time monitoring's purpose. The optical fiber connector specifically comprises: an optical fiber ST connector and/or an optical fiber FC connector. Including optic fibre ST connector and optic fibre FC connector, can be applicable to the surveillance camera head of different optical fiber interface.

Referring to fig. 3, a specific structure of the shield box is shown. The shield case a includes: a case 9 made of a conductive material, an upper cover 12, and a filler 10 disposed between the case 9 and the upper cover 12. The material of the filler 10 is a conductive material. The SMA connector 6 has a plurality. The optical fiber ST connector 7 and the optical fiber FC connector 8 are provided on the side surface of the shield case a. The box body 9 is hinged with one side of the upper cover 12; the other sides of the box body 9 and the upper cover 12 are provided with mutually matched clamping devices 11. The box body 9 and the upper cover 12 are tightly combined together through the clamping device 11, so that the tightness of the shielding box A is ensured, and the shielding performance of the shielding box A is further improved. The box body 9 and the upper cover 12 can be made of stainless steel materials, so that the surface of the shielding box is good in conductivity, not prone to deformation and oxidation, and the grounding of the box body can be better guaranteed. The clamping device 11 may be a snap.

The filler 10 is used to fill a gap between the housing 9 and the upper cover 12 to improve the shielding performance of the shield box a. A filling 10, comprising: conductive foam and copper mesh. The filler 10 can be fixed on the surface of the upper cover 12, and also can be fixed on the surface of the box 9, the utility model discloses do not limit to this, all belong to the protection scope of the utility model.

In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in a device that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The above description of the disclosed embodiments of the invention enables one skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an electromagnetic compatibility test fixture of LVDS signalling equipment which characterized in that includes:

a shielding box; and the number of the first and second groups,

2. The tool for testing the electromagnetic compatibility of the LVDS signaling device according to claim 1, wherein the number of the radio frequency connectors is plural.

3. The electromagnetic compatibility testing tool of the LVDS signaling device according to claim 2, wherein the radio frequency connector is specifically:

SMA connectors or N-type connectors.

4. The electromagnetic compatibility testing tool of the LVDS signaling device according to claim 1, further comprising:

a fiber optic connector located on a side of the shielded enclosure; one connecting end of the optical fiber connector is positioned inside the shielding box, and the other connecting end is positioned outside the shielding box.

5. The electromagnetic compatibility testing tool of LVDS signaling equipment according to claim 4, wherein the optical fiber connector comprises:

an optical fiber ST connector and/or an optical fiber FC connector.

6. The electromagnetic compatibility test fixture of LVDS signaling equipment according to claim 1, wherein the shielding box includes:

the box body (9) and the upper cover (12) are made of conductive materials, one side of the box body (9) and one side of the upper cover (12) are hinged, and the other side of the box body (9) and the other side of the upper cover (12) are provided with clamping devices (11) which are matched with each other.

7. The electromagnetic compatibility testing tool of the LVDS signaling device according to claim 6, wherein the conductive material is specifically:

stainless steel.

8. The tool for testing the electromagnetic compatibility of the LVDS signaling device according to claim 6, wherein the clamping device (11) is specifically:

and (5) buckling.

9. The electromagnetic compatibility testing tool of LVDS signaling equipment according to claim 6, further comprising:

and the filler (10) is arranged between the box body (9) and the upper cover (12), and the material of the filler (10) is a conductive material.

10. The electromagnetic compatibility testing tool of LVDS signaling equipment according to claim 9, wherein the filler (10) comprises:

conductive foam and copper mesh.