Miniaturized EMC (Electro Magnetic Compatibility) debugging equipment
By using miniaturized EMC debugging equipment, combined with a spectrum analyzer and replaceable antennas, the problem of large EMC equipment being unsuitable for debugging small electronic devices has been solved, achieving efficient and economical electromagnetic compatibility testing.
Patent Information
- Application Number
- CN202511451874.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-11
- Publication Date
- 2026-01-06
AI Technical Summary
Existing EMC debugging equipment is bulky and expensive, making it difficult to apply to the debugging and optimization of small electronic devices.
A miniaturized EMC debugging device was designed, including a shielded enclosure, a spectrum analyzer, replaceable antennas, and a 3D-printed bracket. By scanning the spectrum exceeding the standard in a standard 10-meter anechoic chamber, selecting the antenna covering the spectrum exceeding the standard, and combining spectrum analyzer sampling and debugging, the operating environment is ensured to be consistent, and debugging is carried out continuously until the most effective solution is selected.
It enables efficient debugging of electromagnetic compatibility (EMC) of small electronic devices on miniaturized equipment, simplifies the debugging process, reduces equipment costs, and is suitable for EMC testing of small electronic devices.
Smart Images
Figure CN121276201A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of debugging equipment, and in particular to a miniaturized EMC debugging device. Background Technology
[0002] With the continuous development and widespread use of electronic devices, electromagnetic compatibility (EMC) has become a crucial issue in electronic product design. EMC testing aims to ensure that electronic devices do not generate excessive electromagnetic interference (EMI) during use and can withstand a certain level of external electromagnetic interference, preventing performance degradation or malfunction. To meet these requirements, electronic products must undergo rigorous EMC testing to ensure compliance with relevant standards and regulations.
[0003] Currently, all mass-produced electronic products need to pass mandatory certifications in various countries, such as China's CCC, the US's FCC, and the EU's CE certification. This ensures that the electronic products do not generate excessive electromagnetic interference during use and can function normally in electromagnetic environments. The certification process typically involves scanning the product in a 3-meter or 10-meter anechoic chamber using a spectrum analyzer to obtain spectral energy information, and then confirming whether it meets the electromagnetic radiation energy requirements defined in the local regulations.
[0004] Electronic products in the design phase often face difficulties in obtaining certifications from various regions. The more complex the product, the more problems arise, with electromagnetic radiation (RE) being the most challenging. This requires extensive debugging and analysis of the sources of electromagnetic interference, as well as the development of corresponding policies. Traditional EMC debugging equipment is typically large, expensive, and requires specialized testing environments. These devices are mostly used for EMC testing of large electronic products or systems and are not well-suited for debugging and optimization during the development of small electronic devices or single products. Summary of the Invention
[0005] To address the issues of large size and inconvenience in using EMC debugging equipment, this application provides a miniaturized EMC debugging device.
[0006] The miniaturized EMC debugging device provided in this application adopts the following technical solution: A miniaturized EMC debugging device includes a shielded enclosure and a spectrum analyzer. The inner wall of the shielded enclosure is provided with a wave-absorbing material, and an antenna bracket is provided on the top of the shielded enclosure. A replaceable antenna is installed on the antenna bracket. A shelf is installed on the inner bottom surface of the shielded enclosure, and a 3D-printed bracket is installed on the top surface of the shelf. A coaxial cable is connected to the antenna bracket, and the other end of the coaxial cable is connected to the spectrum analyzer.
[0007] By adopting the above technical solution, based on the scanning results in a standard 10-meter anechoic chamber, the spectrum exceeding the standard is identified. The spectrum exceeding the standard is selected for analysis first, and the replaceable antenna is replaced with an antenna capable of covering the spectrum exceeding the standard. The device under test is then placed on a 3D printed support, and the device is operated in the same way as in a standard 10-meter anechoic chamber. The energy curve after the countermeasures are added is sampled by a spectrum analyzer and compared with the energy curve before the countermeasures are added to check the effect. During the debugging process, the operating environment, antenna position, and device placement position are kept the same, so the change in spectrum energy can basically reflect the change in the 10-meter anechoic chamber. The debugging is continued and the change is compared until the most effective solution is selected. The shielding box is small in size and easy to use.
[0008] Preferably, the top surface of the shelf is provided with a coordinate axis.
[0009] By adopting the above technical solution, the 3D printing bracket is placed at a certain position on the top surface of the shelf, and the specific position of the 3D printing bracket is recorded according to the coordinate axis. This allows the device under test to be placed at the recorded specific position after corresponding electromagnetic radiation increase countermeasures are implemented, ensuring that the placement position of the device under test remains consistent before and after the countermeasures are implemented, so as to monitor the changes in the device under test before and after the countermeasures are implemented.
[0010] Preferably, the replaceable antenna is fixed to the antenna bracket via an SMA coaxial connector, and the antenna bracket is rotatable.
[0011] By adopting the above technical solution, the spectral energy is first sampled and the energy curve is saved while the antenna support is in a vertical state. Then, the antenna support is rotated upward by 90°, and the spectral energy is sampled and the energy curve is saved again. Based on the data from the two measurements, the antenna direction with the highest energy at the out-of-standard frequency point is found. Then, the antenna is set to the direction with the highest energy at the frequency point as the reference direction of the antenna. At this time, the electromagnetic radiation energy received by the antenna is the strongest. Then, the 3D printed support is rotated horizontally to drive the device under test to rotate by 90°, and the scale is recorded. The spectral energy curves before and after the rotation are tested, and the direction with the highest energy at the out-of-standard frequency point is selected as the reference direction of the device under test.
[0012] Preferably, a rotating circular plate is rotatably mounted on the top surface of the shelf, and at least two limiting rods are fixed on the top surface of the rotating circular plate. A limiting hole is opened on the bottom surface of the 3D printing bracket, and the limiting rod can be inserted into the limiting hole.
[0013] By adopting the above technical solution, the limiting rod is inserted into the limiting hole, so that the rotating circular plate and the 3D printing bracket can rotate synchronously, and the rotating circular plate can drive the 3D printing bracket to rotate.
[0014] Preferably, a rotating rod is coaxially fixed to the bottom surface of the rotating circular plate, a gear is sleeved and fixed to the outer circumference of the rotating rod, a movable groove is provided in the shelf, and a rack is installed on the shelf along its own length direction through the movable groove, and the rack meshes with the gear.
[0015] By adopting the above technical solution, the rack is moved, the rack drives the gear to rotate, the gear drives the rotating rod to rotate, and the rotating rod drives the rotating disc to rotate, thereby adjusting the direction of the device under test.
[0016] Preferably, a screw is rotatably mounted on the side of the shelf, a slider is fixed on the side of the rack, the slider is sleeved on the outer periphery of the screw, the slider and the screw are threadedly connected, and a rotating handle is fixed at one end of the screw.
[0017] By adopting the above technical solution, rotating the handle drives the screw to rotate, the screw drives the slider to move along the length of the shelf, and in turn drives the rack to move.
[0018] Preferably, the rotating handle includes a synchronizing rod coaxially fixed to the end of the screw, a synchronizing plate fixed to the other end of the synchronizing rod, a rocker arm passing through the side of the synchronizing plate, and a plurality of positioning holes opened on the side of the shelf, the rocker arm being able to be inserted into the positioning holes, and the plurality of positioning holes being equally spaced along the circumference of the synchronizing rod.
[0019] By adopting the above technical solution, after the device under test is rotated to a certain angle, the crank handle is inserted into the corresponding positioning hole, and the screw cannot rotate, thereby keeping the rotating disc static, so as to facilitate the debugging of the device under test.
[0020] Preferably, a turntable is fixedly fitted onto the outer circumference of the synchronizing rod, and a pull rope is wound around the outer circumference of the turntable. One end of the pull rope is fixedly connected to the outer circumference of the turntable, and a control plate is fixed to the other end of the pull rope. A control groove is provided on the side of the shelf, and the control plate slides and engages with the shelf along the width direction of the shelf through the control groove. A fixing rod is fixed in the control groove, and a coil spring is wound around the outer circumference of the fixing rod. One end of the coil spring is fixedly connected to the outer circumference of the fixing rod, and the other end of the coil spring is fixedly connected to the side of the control plate.
[0021] By adopting the above technical solution, during the rotation of the screw, the turntable winds up the pull rope, and the pull rope drives the control plate to move in the control groove. The elasticity of the coil spring keeps the pull rope in a taut state. While the gear rotates 360°, the control plate can move to a position close to the turntable so that the operator can record the rotation angle of the rotating disc.
[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Based on the scanning results in a standard 10-meter anechoic chamber, identify the spectrum exceeding the standard. Select the spectrum exceeding the standard to analyze first, replace the replaceable antenna with one that can cover the spectrum exceeding the standard, place the device under test on a 3D printed support, and run the device in the same way as in a standard 10-meter anechoic chamber. Then, sample the energy curve after the countermeasures are added using a spectrum analyzer and compare it with the energy curve before the countermeasures are added to check the effect. During the debugging process, keep the operating environment, antenna position, and device placement the same, so the change in spectrum energy can basically reflect the change in the 10-meter anechoic chamber. Continue to debug and compare the changes until the most effective solution is selected. 2. Place the 3D printing bracket at a certain position on the top surface of the shelf, and record the specific position of the 3D printing bracket according to the coordinate axis. This will allow the device under test to be placed at the recorded specific position after the corresponding electromagnetic radiation increase countermeasures are implemented. This will ensure that the placement position of the device under test remains consistent before and after the countermeasures are implemented, so as to monitor the changes in the device under test before and after the countermeasures are implemented. 3. First, sample the spectral energy while keeping the antenna support vertical and save the energy curve. Then, rotate the antenna support upwards by 90°, sample the spectral energy again, and save the energy curve. Based on the data from the two measurements, find the antenna direction with the highest energy at the out-of-standard frequency point. Then, set the antenna to the direction with the highest energy at the frequency point as the antenna's reference direction. At this time, the electromagnetic radiation energy received by the antenna is the strongest. Next, rotate the 3D printed support horizontally to rotate the device under test by 90° and record the scale. Test the spectral energy curves before and after the rotation, and select the direction with the highest energy at the out-of-standard frequency point as the reference direction of the device under test. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.
[0024] Figure 2 This is a schematic diagram of the internal structure of the shielding box in Embodiment 1 of this application.
[0025] Figure 3 This is a schematic diagram of the internal structure of the shielding box in Embodiment 2 of this application.
[0026] Figure 4 This is a schematic diagram of the rotating circular plate and the 3D printing bracket in Embodiment 2 of this application.
[0027] Figure 5 This is a cross-sectional view of the shelf in Embodiment 2 of this application.
[0028] Figure 6 This is a schematic diagram of the moving piece and the pull rope in Embodiment 2 of this application.
[0029] Reference numerals: 1. Shielding enclosure; 11. Absorbing material; 12. Antenna bracket; 13. Replaceable antenna; 14. Coaxial cable; 2. Spectrum analyzer; 3. Shelf; 31. 3D printed bracket; 4. Rotating circular plate; 41. Limiting rod; 42. Limiting hole; 43. Rotating rod; 44. Gear; 5. Rack; 51. Moving slot; 52. Slider; 53. Screw; 6. Rotating handle; 61. Synchronizing rod; 62. Synchronizing plate; 63. Crank handle; 64. Positioning hole; 7. Turntable; 71. Pull rope; 72. Control plate; 73. Control slot; 74. Fixing rod; 75. Coil spring. Detailed Implementation
[0030] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.
[0031] This application discloses a miniaturized EMC debugging device.
[0032] Example 1 Reference Figure 1 and Figure 2 The miniaturized EMC debugging equipment includes a shielded enclosure 1 and a spectrum analyzer 2. The inner wall of the shielded enclosure 1 is lined with absorbing material 11. An antenna bracket 12 is mounted on the top of the shielded enclosure 1, and a replaceable antenna 13 is mounted on the antenna bracket 12. A coaxial cable 14 is connected to the antenna bracket 12, and the other end of the coaxial cable 14 is connected to the spectrum analyzer 2. The replaceable antenna 13 can be a plastic rod antenna, a PCB antenna, or a waveguide antenna, etc. The replaceable antenna 13 is fixed to the antenna bracket 12 via an SMA coaxial connector, and the antenna bracket 12 is rotatable.
[0033] Reference Figure 2 The inner bottom surface of the shielded enclosure 1 is equipped with a shelf 3, and the top surface of the shelf 3 is provided with coordinate axes. A 3D printing bracket 31 is installed on the top surface of the shelf 3, and the device under test (DUT) can be placed on the top surface of the 3D printing bracket 31. When testing different DUTs and their various surfaces, the surface to be tested needs to be aligned with the replaceable antenna 13. Different 3D printing brackets 31 can be designed to meet the testing requirements.
[0034] The implementation principle of Embodiment 1 of this application is as follows: based on the scanning results in a standard 10-meter anechoic chamber, the spectrum exceeding the standard is identified, the spectrum exceeding the standard is selected for analysis first, and the replaceable antenna 13 is replaced with an antenna that can cover the spectrum exceeding the standard. Next, place the device under test on the 3D printing bracket 31, place the 3D printing bracket 31 at a certain position on the shelf 3 and record the position scale; then run the device in the same way as the standard 10-meter anechoic chamber, and then sample the spectrum energy of the antenna band through the spectrum analyzer 2 and save the energy curve; Next, select the antenna bracket at 1290 degrees, sample the spectrum energy and save the energy curve. Analyze the data from the two measurements to find the antenna direction with the highest energy at the frequency point exceeding the standard. Then, set the antenna to the direction with the highest energy at the frequency point as the antenna's reference direction. After that, rotate the 3D printed bracket 31 in the horizontal direction. The 3D printed bracket 31 drives the device under test to rotate 90 degrees synchronously, and record the scale. Test the spectrum energy curves before and after the rotation, and select the direction with the highest energy at the frequency point exceeding the standard as the reference direction of the device. During the debugging process, the reference directions of the antenna and the equipment are kept unchanged. Next, the equipment under test is taken out for analysis and corresponding electromagnetic radiation improvement measures are added. Then, the equipment under test is placed on the 3D printing bracket 31 again, and then placed in the same position on the shelf 3 according to the recorded scale. Then, the energy curve after the measures are added is sampled by the spectrum analyzer 2 and compared with the curve before the measures are added to check the effect. Since the operating environment, antenna position and equipment placement position are the same, the change in spectrum energy can basically reflect the change in the 10-meter anechoic chamber. Debugging and comparison of changes are continued until the most effective solution is selected.
[0035] Example 2 Reference Figure 3 and Figure 4 The difference between this embodiment and Embodiment 1 is that a rotating circular plate 4 is rotatably mounted on the top surface of the shelf 3, and two vertically arranged limiting rods 41 are fixed on the top surface of the rotating circular plate 4. A limiting hole 42 is opened on the bottom surface of the 3D printing bracket 31, and the limiting rod 41 can be inserted into the limiting hole 42. A rotating rod 43 is coaxially fixed on the bottom surface of the rotating circular plate 4, and a gear 44 is sleeved and fixed on the outer circumference of the rotating rod 43. A moving groove 51 is opened in the shelf 3, and a rack 5 is mounted on the shelf 3 along its own length direction through the moving groove 51. The rack 5 and the gear 44 mesh with each other.
[0036] Reference Figure 5 and Figure 6 A screw 53 is rotatably mounted on the side of the shelf 3, and a slider 52 is fixed to the side of the rack 5. The slider 52 is sleeved on the outer circumference of the screw 53, and the slider 52 and the screw 53 are threadedly connected. A rotating handle 6 is fixed to one end of the screw 53. The rotating handle 6 includes a synchronizing rod 61 coaxially fixed to the end of the screw 53, and a synchronizing plate 62 is fixed to the other end of the synchronizing rod 61. Several positioning holes 64 are provided on the side of the shelf 3, and the positioning holes 64 are evenly spaced along the circumference of the synchronizing rod 61. A rocker handle 63 passes through the side of the synchronizing plate 62 and can be inserted into the positioning holes 64.
[0037] The rack 5 is moved, which drives the gear 44 to rotate. The gear 44 drives the rotating rod 43 to rotate, and the rotating rod 43 drives the rotating circular plate 4 to rotate, thereby adjusting the direction of the device under test.
[0038] Reference Figure 5 and Figure 6 A turntable 7 is fixedly fitted onto the outer circumference of the synchronizing rod 61, and a pull rope 71 is wound around the outer circumference of the turntable 7. One end of the pull rope 71 is fixedly connected to the outer circumference of the turntable 7, and the other end of the pull rope 71 is fixedly connected to a control plate 72. A control groove 73 is provided on the side of the shelf 3, and the control plate 72 slides and engages with the shelf 3 along the width direction of the shelf 3 through the control groove 73. A fixing rod 74 is fixedly fixed inside the control groove 73, and a coil spring 75 is wound around the outer circumference of the fixing rod 74. One end of the coil spring 75 is fixedly connected to the outer circumference of the fixing rod 74, and the other end of the coil spring 75 is fixedly connected to the side of the control plate 72.
[0039] During the rotation of screw 53, turntable 7 winds up pull rope 71, and pull rope 71 drives control plate 72 to move in control groove 73. The elasticity of coil spring 75 keeps pull rope 71 taut. While gear 44 rotates 360°, control plate 72 can move to a position close to turntable 7 so that the operator can record the rotation angle of rotating disc 4.
[0040] The implementation principle of Embodiment 2 of this application is as follows: rotating the handle 6 drives the screw 53 to rotate, the screw 53 drives the slider 52 to move along the length direction of the shelf 3, and then drives the rack 5 to move. The rack 5 drives the gear 44 to rotate, the gear 44 drives the rotating rod 43 to rotate, and the rotating rod 43 drives the rotating circular plate 4 to rotate, thereby rotating the direction of the device under test. After the device under test is rotated to a certain angle, the crank handle 63 is inserted into the corresponding positioning hole 64, the screw 53 cannot rotate, and thus the rotating circular plate 4 remains static, so as to facilitate the debugging of the device under test.
[0041] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A miniaturized EMC commissioning device, characterized in that: It includes shielding box (1) and spectrum analyzer (2), the inner wall of shielding box (1) is provided with wave absorbing material (11), the top of shielding box (1) is provided with antenna support (12), replaceable antenna (13) is installed on antenna support (12), the inner bottom surface of shielding box (1) is installed with shelf (3), the top surface of shelf (3) is installed with 3D printing support (31), coaxial cable (14) is connected on antenna support (12), the other end of coaxial cable (14) is connected with spectrum analyzer (2).
2. The miniaturized EMC commissioning device according to claim 1, characterized in that: The top surface of the shelf (3) is provided with coordinate axes.
3. The miniaturized EMC commissioning device according to claim 1, characterized in that: The replaceable antenna (13) is fixed to the antenna support (12) through the SMA coaxial connector, and the antenna support (12) can rotate.
4. The miniaturized EMC commissioning device according to claim 1, characterized in that: The top surface of the shelf (3) is rotatably installed with a rotating circular plate (4), and the top surface of the rotating circular plate (4) is fixed with at least two limiting rods (41), and the bottom surface of the 3D printing support (31) is provided with a limiting hole (42), and the limiting rod (41) can be inserted into the limiting hole (42).
5. A miniaturized EMC commissioning device according to claim 4, characterized in that: The bottom surface of the rotating circular plate (4) is coaxially fixed with a rotating rod (43), the outer circumferential surface of the rotating rod (43) is fixedly sleeved with a gear (44), the shelf (3) is provided with a moving groove (51), the shelf (3) is slidably installed with a rack (5) along the length direction of the shelf (3) through the moving groove (51), and the rack (5) and the gear (44) are engaged with each other.
6. A miniaturized EMC commissioning device according to claim 5, characterized in that: The side surface of the shelf (3) is rotatably installed with a screw rod (53), the side surface of the rack (5) is fixedly provided with a sliding block (52), the sliding block (52) is sleeved on the outer circumferential surface of the screw rod (53), the sliding block (52) and the screw rod (53) are threadedly driven and matched, and one end of the screw rod (53) is fixedly provided with a rotating handle (6).
7. A miniaturized EMC commissioning device according to claim 6, characterized in that: The rotating handle (6) comprises a synchronous rod (61) coaxially fixed to the end of the screw rod (53), the other end of the synchronous rod (61) is fixedly provided with a synchronous plate (62), the side surface of the synchronous plate (62) is provided with a crank handle (63), the side surface of the shelf (3) is provided with a plurality of positioning holes (64), the crank handle (63) can be inserted into the positioning hole (64), and a plurality of positioning holes (64) are arranged at equal intervals along the circumferential direction of the synchronous rod (61).
8. A miniaturized EMC commissioning device according to claim 7, characterized in that: The outer circumferential surface of the synchronous rod (61) is sleeved with a rotating disc (7), the outer circumference of the rotating disc (7) is provided with a pull rope (71), one end of the pull rope (71) is fixedly connected with the outer circumferential surface of the rotating disc (7), the other end of the pull rope (71) is fixedly provided with a control piece (72), the side surface of the shelf (3) is provided with a control groove (73), the control piece (72) is slidably connected with the shelf (3) through the control groove (73) along the width direction of the shelf (3), the control groove (73) is fixedly provided with a fixing rod (74), the outer circumference of the fixing rod (74) is provided with a coil spring (75), one end of the coil spring (75) is fixedly connected with the outer circumferential surface of the fixing rod (74), the other end of the coil spring (75) is fixedly connected with the side surface of the control piece (72).