Test system
By using a test system with shielded boxes and filters in HU's EMC test, the impact of HU load EMC problem on the test results was solved, and the smooth progress of electromagnetic compatibility testing and cost reduction were achieved.
Patent Information
- Application Number
- CN202421811065.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-07-29
AI Technical Summary
The EMC problem of HU load affects the EMC test results of HU, resulting in the failure of the test, increasing the development cycle and difficulty.
The test system includes a shielding box and a filter is adopted. The shielding box has a built-in actual load, which is electrically connected to the device under test through the waveguide, and the filter is connected to the power interface. The shielding box realizes electromagnetic shielding and power supply filtering to isolate external electromagnetic interference.
It effectively avoids the impact of electromagnetic compatibility problems of actual load on the device under test, ensures the smooth progress of electromagnetic compatibility testing, shortens the test cycle, and reduces the test cost.
Smart Images
Figure CN223065413U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of testing, and particularly relates to a testing system. Background Art
[0002] At present, the function integration degree of HU (Head Unit, in-vehicle host) is getting higher and higher, and the functions of HU are getting more and more complex, which brings greater challenges to the EMC (Electro Magnetic Compatibility) testing of HU.
[0003] For the EMC testing of HU, a real HU load needs to be used. However, during the testing process, there will be EMC problems with the HU load, and the EMC problems of the HU load will affect the EMC test results of HU, resulting in the failure of the EMC testing of HU. Content of the Utility Model
[0004] The utility model provides a testing system, aiming to at least solve the technical problem that the EMC problems of the HU load in the prior art will affect the EMC test results of HU.
[0005] In the first aspect of the implementation of the utility model, first, a testing system is provided, which includes an actual load, a shielding box, and a device under test. The actual load is placed inside the shielding box. The shielding box includes a box body and a waveguide port provided on the box body. The actual load is electrically connected to the device under test through a test line, and the waveguide port is used for the test line to pass through.
[0006] The shielding box further includes a filter and a power supply interface. The filter is located inside the box body, the power supply interface is provided on the box body, the power supply interface is electrically connected to the filter, and the filter is electrically connected to the actual load.
[0007] Optionally, the box body further includes a shielding observation window, and the shielding observation window includes a transparent main body and a shielding net provided inside the transparent main body.
[0008] Optionally, the box body has a plurality of inner surfaces, and an absorbing layer is provided on at least one inner surface of the box body.
[0009] Optionally, the material of the box body is metal, and the box body includes a lower box body and an upper cover body covering the lower box body.
[0010] An elastic conductive strip is provided on the lower box body, and the upper cover body is in close contact with the lower box body through the elastic conductive strip.
[0011] Optionally, a buckle is provided on the upper cover body, and a clamping groove matching with the buckle is formed on the lower box body; alternatively, a buckle is provided on the lower box body, and a clamping groove matching with the buckle is formed on the upper cover body;
[0012] When the upper cover body covers the lower box body, the buckle is clamped with the clamping groove.
[0013] Optionally, one end of the upper cover body in the first direction is hinged to the lower box body.
[0014] Optionally, the plurality of inner surfaces include a top inner surface and a plurality of side inner surfaces, and the top inner surface and the plurality of side inner surfaces are both provided with the absorbing layer.
[0015] Optionally, the absorbing layer is any one of a polyurethane absorbing sponge layer, a non-woven fabric absorbing layer, and a ferrite absorbing layer.
[0016] Optionally, the elastic conductive strip is a conductive foam; the elastic conductive strip is bonded to the lower box body through a conductive adhesive.
[0017] Optionally, a semi-anechoic chamber is further included, and the actual load, the shielding box, and the test line are all placed in the semi-anechoic chamber.
[0018] When the test system provided by the embodiment of the present invention is used to test the device under test, the actual load is placed in the shielding box, and the shielding box can achieve electromagnetic shielding and effectively isolate external electromagnetic interference. Therefore, the electromagnetic compatibility problem of the actual load can be avoided from affecting the electromagnetic compatibility test of the device under test, and further the result of the electromagnetic compatibility test of the device under test is prevented from being affected, so as to ensure the smooth progress of the electromagnetic compatibility test of the device under test. In addition, through the setting of the waveguide port, the propagation of the actual load noise through the waveguide port can be effectively avoided. In addition, through the setting of the filter electrically connected to the power supply interface, the power supply filtering of the actual load can be realized, and the influence of the actual load power noise on the test can be avoided, and further the influence on the emission test of the electromagnetic compatibility of the device under test can be avoided. In addition, since the electromagnetic compatibility problem of the actual load is avoided from affecting the electromagnetic compatibility test of the device under test, it is not necessary to locate whether it is a problem of the actual load or the device under test, thereby shortening the test cycle. In addition, it is not necessary to use an expensive optocoupler for testing, and only a shielding box is needed, which can reduce the test cost. And the structure of the test system is simple and easy to implement. Description of the Drawings
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.
[0020] Figure 1Schematic diagram of the structure of the test system provided in the embodiment of the present utility model;
[0021] Figure 2 Schematic diagram of the structure of the shielding box in the test system provided in the embodiment of the present utility model Figure 1 ;
[0022] Figure 3 Schematic diagram of the structure of the shielding box in the test system provided in the embodiment of the present utility model Figure 2 .
[0023] Reference numerals:
[0024] 1 - shielding box, 11 - box body, 111 - upper cover body, 112 - lower box body, 113 - shielding observation window, 114 - buckle, 115 - inner surface, 1151 - top inner surface, 1152 - side inner surface, 1153 - bottom inner surface, 12 - waveguide port, 13 - filter, 14 - power supply interface, 15 - elastic conductive strip, 2 - test line, 3 - device under test, 4 - anechoic chamber, 5 - test table. Specific embodiments
[0025] The technical solutions in the embodiments of the present utility model will be described below with reference to the accompanying drawings in the embodiments of the present utility model.
[0026] The embodiments of the present utility model are only used to explain the present utility model and are not used to limit the scope of the present utility model. In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present utility model.
[0027] Currently, for the EMC test of HU, it is usually impossible to use a simulated load for replacement, so a real HU load needs to be used. However, during the test process, there will be EMC problems with the HU load, and the EMC problems of the HU load will affect the EMC test results of HU, resulting in the failure of the EMC test of HU. When the EMC test of HU fails, it is necessary to determine whether it is a problem with the HU load or HU, which brings challenges to the development cycle and development difficulty, and it takes a lot of time to troubleshoot the problems of the HU load. To solve the above problems, the embodiments of the present utility model provide a test system, and the above-mentioned test system will be specifically described below.
[0028] Refer to Figure 1 and Figure 2, the test system provided by the embodiment of the present utility model includes an actual load, a shielding box 1, and a device under test 3. The actual load is placed inside the shielding box 1. The shielding box 1 includes a box body 11 and a waveguide port 12 provided on the box body 11. The actual load is electrically connected to the device under test 3 through a test line 2, and the waveguide port 12 is used for the test line 2 to pass through. The shielding box 1 further includes a filter 13 and a power supply interface 14. The filter 13 is located inside the box body 11, the power supply interface 14 is provided on the box body 11, the power supply interface 14 is electrically connected to the filter 13, and the filter 13 is electrically connected to the actual load.
[0029] Among them, this test system is used for the test of the device under test 3. The device under test 3 can be an in-vehicle host. At this time, this test system is specifically used for the electromagnetic compatibility test of the in-vehicle host. The electromagnetic compatibility test of the in-vehicle host can be carried out in a semi-anechoic chamber 4. During the test, the actual load, the shielding box 1, the test line 2, and the device under test 3 are all placed inside the semi-anechoic chamber 4. The actual load can be a camera, a head-up display (HUD), an in-vehicle display screen, a virtual reality (VR) display device, a projection display screen, etc. One shielding box 1 can hold one actual load or multiple actual loads.
[0030] The shielding box 1 is preferably an electromagnetic shielding box, and the filter 13 is preferably a power filter. The box body 11 can include an upper cover body 111 and a lower box body 112. The waveguide port 12 is preferably provided on the lower box body 112. An installation through hole is opened on the lower box body 112, and the waveguide port 12 is installed on this installation through hole. The connection method between the waveguide port 12 and the lower box body 112 can be welding, threaded connection, etc. The test line 2 passes through the waveguide port 12 to realize wire routing. The cut-off frequency of the waveguide port 12 reaches 10G. Through the setting of the waveguide port 12, it can effectively avoid the propagation of load noise through the waveguide port 12. The power supply interface 14 is used to connect to an external power supply. The external power supply can be a low-voltage DC power supply, such as a 9V - 16V DC power supply. The filter 13 is located inside the box body 11, which can avoid the external radiation of the noise of the input and output wire harnesses of the filter 13.
[0031] During the test, first place the device under test 3 in the semi-anechoic chamber 4, put the actual load into the shielding box 1, and electrically connect the actual load to the filter 13 so that the actual load is connected to the power supply interface 14 through the filter 13. Then pass one end of the test line 2 through the waveguide port 12 and electrically connect one end of the test line 2 to the actual load. Then put the test line 2 and the shielding box 1 with the actual load into the semi-anechoic chamber 4, and connect the other end of the test line 2 to the device under test 3.
[0032] When testing the device under test 3 using the test system provided by the embodiments of the present utility model, the actual load is placed inside the shielding box 1. The shielding box 1 can achieve electromagnetic shielding and effectively isolate external electromagnetic interference. Therefore, it can avoid the influence of the electromagnetic compatibility problem of the actual load on the electromagnetic compatibility test of the device under test 3, and further avoid the influence on the test result of the electromagnetic compatibility test of the device under test 3, so as to ensure the smooth progress of the electromagnetic compatibility test of the device under test 3. In addition, through the setting of the waveguide port 12, it can effectively avoid the propagation of the actual load noise through the waveguide port 12. Moreover, through the setting of the filter 13 electrically connected to the power supply interface 14, the power supply filtering of the actual load can be achieved, avoiding the influence of the actual load power supply noise on the test, and further avoiding the influence on the emission test of the electromagnetic compatibility of the device under test 3. Additionally, since the influence of the electromagnetic compatibility problem of the actual load on the electromagnetic compatibility test of the device under test 3 is avoided, there is no need to locate whether it is a problem of the actual load or the device under test, thus shortening the test cycle. Furthermore, there is no need to use expensive optocouplers for testing, and only the shielding box 1 is needed, which can reduce the test cost. And the structure of this test system is simple and easy to implement.
[0033] Referring to Figure 2 , in a preferred embodiment of the present utility model, the box body 11 further includes a shielding observation window 113, and the shielding observation window 113 includes a transparent main body and a shielding net arranged inside the transparent main body.
[0034] Among them, the shielding observation window 113 is preferably arranged on the upper cover body 111, and specifically arranged at the top of the upper cover body 111. The transparent main body in the shielding observation window 113 can be a glass plate. The shielding observation window 113 preferably includes two laminated glass plates, and the shielding net is arranged between the two glass plates. The shielding net is specifically a metal shielding net, such as a copper shielding net. The metal shielding net can block or reduce the penetration of electromagnetic waves, thereby protecting the internal equipment or space from the influence of external electromagnetic interference. The shielding effectiveness of this shielding net can reach 60 db in the frequency range of 0G - 10G. When the actual load is a vehicle-mounted display screen or a projection display screen, the working condition of the internal vehicle-mounted display screen or projection display screen can be observed through the shielding observation window 113.
[0035] In the embodiments of the present utility model, through the setting of the shielding observation window 113, when the actual load is a vehicle-mounted display screen or a projection display screen, it can be directly observed through the shielding observation window 113 whether the vehicle-mounted display screen or the projection display screen is working properly. In addition, through the setting of the shielding net, it can effectively shield noise to avoid the influence of the emission problem and immunity problem of the actual load on the device under test 3.
[0036] Referring to Figure 3, in a preferred embodiment of the present utility model, the box body 11 has a plurality of inner surfaces 115, and an absorbing layer is provided on at least one inner surface 115 of the box body 11. The absorbing layer can effectively absorb the actual load noise and avoid the reflection of noise inside the shielding box 1, thereby improving the shielding effectiveness.
[0037] The absorbing layer is any one of a polyurethane absorbing sponge layer, a non-woven fabric absorbing layer, and a ferrite absorbing layer. The absorbing layer is preferably a polyurethane absorbing sponge layer. The thickness of the absorbing layer can be set according to actual requirements, and this embodiment does not limit it.
[0038] The plurality of inner surfaces 115 include a top inner surface 1151 and a plurality of side inner surfaces 1152, and absorbing layers are provided on both the top inner surface 1151 and the plurality of side inner surfaces 1152. Preferably, the box body 11 has six inner surfaces 115, and the six inner surfaces 115 include a top inner surface 1151, four side inner surfaces 1152, and a bottom inner surface 1153. Absorbing layers are provided on both the top inner surface 1151 and the four side inner surfaces 1152, and no absorbing layer is provided on the bottom inner surface 1153.
[0039] Refer to Figure 2 and Figure 3 , in a preferred embodiment of the present utility model, the box body 11 is made of metal, and the box body 11 includes a lower box body 112 and an upper cover body 111 covering the lower box body 112; an elastic conductive strip 15 is provided on the lower box body 112, and the upper cover body 111 is in close contact with the lower box body 112 through the elastic conductive strip 15.
[0040] Specifically, the box body 11 can be made of galvanized steel, and galvanized steel has good electromagnetic shielding performance and structural strength. The elastic conductive strip 15 is a conductive foam, which combines the softness of the foam and the conductivity of the conductive material. The elastic conductive strip 15 is bonded to the lower box body 112 through a conductive adhesive, and the conductive adhesive can firmly fix the elastic conductive strip 15 on the lower box body 112 and ensure the conductivity between the elastic conductive strip 15 and the lower box body 112. The lower box body 112 can be a rectangular box with an upper opening, and the elastic conductive strip 15 is specifically provided at the four peripheral edges of the upper opening of the lower box body 112.
[0041] The design of the shielding box 1 should ensure its conductive continuity. Traditional rigid connections may produce tiny gaps or uneven pressure distributions at the connection points, which may affect the conductive performance. In the embodiment of the present utility model, the elasticity of the elastic conductive strip 15 can ensure good electrical contact even on uneven or slightly deformed surfaces, avoiding the inability to guarantee the conductive performance caused by the rigid connection at the pressing joint between the upper cover body 111 and the lower box body 112. In addition, by arranging the elastic conductive strip 15, it can ensure the surface contact between the upper cover body 111 and the lower box body 112, avoid gaps between the upper cover body 111 and the lower box body 112, and thus improve the shielding effectiveness of the shielding box 1.
[0042] Referring to Figure 2 and Figure 3 , in a preferred embodiment of the present utility model, a buckle 114 is provided on the upper cover body 111, and a clamping groove matching with the buckle 114 is formed on the lower box body 112; alternatively, a buckle 114 is provided on the lower box body 112, and a clamping groove matching with the buckle 114 is formed on the upper cover body 111; when the upper cover body 111 is covered on the lower box body 112, the buckle 114 is clamped with the clamping groove.
[0043] Preferably, a buckle 114 is provided on the upper cover body 111, and a clamping groove matching with the buckle 114 is formed on the lower box body 112. The number of buckles 114 can be multiple, and the multiple buckles 114 are arranged at intervals along the second direction, and the second direction can be the length direction of the box body 11, and the second direction is perpendicular to the first direction. The number of buckles 114 can be two, three, four, five, etc. When the upper cover body 111 is covered on the lower box body 112, the buckle 114 is clamped with the clamping groove, and the buckle 114 is used to provide a stable pulling force to ensure the close contact between the upper cover body 111 and the lower box body 112, and thus can ensure the electrical connection between the upper cover body 111 and the lower box body 112.
[0044] Referring to Figure 3 , in a preferred embodiment of the present utility model, one end of the upper cover body 111 along the first direction is hinged to the lower box body 112. Wherein, the first direction can be the width direction of the box body 11, and the first direction can refer to Figure 3 the direction shown by the A arrow in
[0045] Referring to Figure 1, in a preferred embodiment of the present utility model, the test system further includes a semi-anechoic chamber 4, and the actual load, the shielding box 1, and the test line 2 are all placed inside the semi-anechoic chamber 4. The semi-anechoic chamber 4 absorbs the internal electromagnetic waves, reduces reflection and external interference, thereby providing a stable test environment. The test system further includes a test table 5 located inside the semi-anechoic chamber 4. During the test, the shielding box 1 and the device under test 3 can be placed on the test table 5.
[0046] The process of performing electromagnetic compatibility testing on the device under test 3 using the above-provided test system may include:
[0047] First, place the device under test 3 on the test table 5 inside the semi-anechoic chamber 4; then open the upper cover body 111 of the shielding box 1, put the actual load into the shielding box 1, and electrically connect the actual load to the filter 13 so that the actual load is connected to the power interface 14 through the filter 13, and then pass one end of the test line 2 through the waveguide port 12 and electrically connect one end of the test line 2 to the actual load; then close the upper cover body 111. At this time, the buckle 114 is engaged with the card slot, and the upper cover body 111 is in close contact with the lower box body 112 through the elastic conductive strip 15; then place the test line 2 and the shielding box 1 with the actual load on the test table 5 inside the semi-anechoic chamber 4, and connect the other end of the test line 2 to the device under test 3; finally, perform electromagnetic compatibility testing on the device under test 3 inside the semi-anechoic chamber 4.
[0048] In summary, the box body 11 in the test system provided by the present embodiment of the utility model includes a shielding observation window 113. Through the setting of the shielding observation window 113, when the actual load is a vehicle-mounted display screen or a projection display screen, it is possible to directly observe whether the vehicle-mounted display screen or the projection display screen is working properly through the shielding observation window 113. A waveguide port 12 is provided on the box body 11, and the test line 2 passes through the waveguide port 12 to realize wire routing, and the actual load noise cannot propagate through the waveguide port 12. A filter 13 is provided inside the box body 11. Through the setting of the filter 13, power supply filtering of the actual load can be realized, and the influence of the actual load power noise on the test can be avoided.
[0049] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.
[0050] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this text are for illustrative purposes only.
[0051] Each embodiment in this specification is described in a related manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.
[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
[0053] The above has introduced the test system provided by the present invention in detail. Specific examples are used in this text to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the structure and core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.
Claims
1. A test system, characterized in that, It includes an actual load, a shielding box, and a device under test. The actual load is placed inside the shielding box. The shielding box includes a box body and a waveguide port provided on the box body. The actual load is electrically connected to the device under test through a test line, and the waveguide port is used for the test line to pass through; The shielding box further includes a filter and a power interface. The filter is located inside the box body, the power interface is provided on the box body, the power interface is electrically connected to the filter, and the filter is electrically connected to the actual load.
2. The test system according to claim 1, characterized in that, The box body further includes a shielding observation window, and the shielding observation window includes a transparent main body and a shielding mesh provided inside the transparent main body.
3. The test system according to claim 1, characterized in that, The box body has a plurality of inner surfaces, and an absorbing layer is provided on at least one of the inner surfaces of the box body.
4. The test system according to any one of claims 1 to 3, characterized in that, The material of the box body is metal, and the box body includes a lower box body and an upper cover body covering the lower box body; An elastic conductive strip is provided on the lower box body, and the upper cover body is in close contact with the lower box body through the elastic conductive strip.
5. The test system according to claim 4, characterized in that, A buckle is provided on the upper cover body, and a card slot matching the buckle is provided on the lower box body; or, a buckle is provided on the lower box body, and a card slot matching the buckle is provided on the upper cover body; When the upper cover body covers the lower box body, the buckle is engaged with the card slot.
6. The test system according to claim 4, wherein One end of the upper cover body in the first direction is hinged to the lower box body.
7. The test system according to claim 3, wherein The plurality of inner surfaces include a top inner surface and a plurality of side inner surfaces, and the absorbing layer is provided on both the top inner surface and the plurality of side inner surfaces.
8. The test system according to claim 3, characterized in that, The absorbing layer is any one of a polyurethane absorbing sponge layer, a non-woven fabric absorbing layer, and a ferrite absorbing layer.
9. The test system according to claim 4, wherein The elastic conductive strip is a conductive foam; the elastic conductive strip is bonded to the lower box body through a conductive adhesive.
10. The test system according to any one of claims 1 to 3, characterized in that, It further includes a semi-anechoic chamber, and the actual load, the shielding box, and the test line are all placed inside the semi-anechoic chamber.