Electromagnetic anti-interference test system for lamp products

Abstract

The utility model discloses an electromagnetic anti-interference test system for lamp products, which comprises a test support used for supporting, the test support is provided with a plurality of test mounting holes, optical fiber test heads can be mounted in the test mounting holes, and the optical fiber test heads directly face a lamp to be tested on one side; the electromagnetic interference equipment is mounted on one side of the to-be-tested lamp and is used for carrying out electromagnetic interference on the to-be-tested lamp; provided is a luminous flux voltage linear converter. According to the utility model, the optical fiber is combined with the luminous flux voltage linear converter, so that the brightness change of lamp products in an electromagnetic interference test can be accurately monitored, the limitation of traditional naked eye monitoring is avoided, and especially the problem that tiny brightness change cannot be perceived is solved; the converter has the function of linearly converting luminous flux change into voltage signals, interference fluctuation is displayed in real time through the oscilloscope, and the optical performance of the lamp under electromagnetic interference can be reflected more visually and accurately.

Description

Technical Field

[0001] This utility model relates to a testing system, specifically an electromagnetic interference testing system for lighting products. Background Art

[0002] In electromagnetic compatibility (EMC) testing, lighting products are a common test subject, and the stability of their brightness is particularly important for evaluating their performance in electromagnetic interference environments. However, traditional visual monitoring methods have significant limitations in practical testing. First, the naked eye struggles to accurately detect minute changes in brightness, especially during prolonged testing, where operator fatigue can cause them to overlook subtle fluctuations. Furthermore, visual monitoring cannot precisely quantify the proportion of brightness changes, failing to meet the data accuracy requirements of modern EMC testing.

[0003] To overcome these problems, some automated luminous flux monitoring devices have emerged on the market. These devices convert changes in luminous intensity into electrical signals, allowing for real-time quantitative monitoring using equipment such as oscilloscopes. However, some existing devices still suffer from insufficient anti-interference capabilities and poor output signal stability in practical use, especially in environments with strong electromagnetic interference, where test accuracy is often significantly affected. Furthermore, existing equipment is typically bulky, consumes a lot of power, and is inconvenient to carry and use for on-site testing.

[0004] Therefore, there is an urgent need for a reasonably designed, highly resistant to electromagnetic interference, compact, and low-power luminous flux voltage conversion device to accurately and stably monitor changes in the brightness of lighting products during EMC testing, thereby further improving the reliability and convenience of testing. Utility Model Content

[0005] To address the aforementioned problems, this invention provides an electromagnetic interference testing system for lighting products, which effectively overcomes many shortcomings in the existing technology.

[0006] This utility model is achieved through the following technical solution: an electromagnetic interference testing system for lighting products, comprising:

[0007] A test bracket is used for support. The test bracket has multiple test mounting holes, in which fiber optic test heads can be installed. The fiber optic test heads face the lamp to be tested on one side.

[0008] An electromagnetic interference device is installed on one side of the lamp under test and is used to subject the lamp under test to electromagnetic interference.

[0009] The optical flux-voltage linear converter has an optical fiber connection at the output end of the test bracket. One end of the optical fiber connection is connected to the test bracket, and the other end is connected to the optical signal input connector of the optical flux-voltage linear converter. Each optical signal input connector in the optical flux-voltage linear converter is equipped with a photosensitive chip, which receives optical signals and outputs them as electrical signals.

[0010] An oscilloscope is connected to the optical flux-voltage linear converter via an electrical signal connection line. The electrical signal is output to the oscilloscope through the electrical signal connection line, and the oscilloscope displays the fluctuation of electromagnetic interference.

[0011] As a preferred technical solution, a corrugated flexible tube is installed on the outside of the optical fiber test head. The corrugated flexible tube can be bent into any shape and positioned. The optical fiber test head is connected to the optical fiber connection line, which is used to guide the light from the lamp under test to the luminous flux-voltage linear converter for testing.

[0012] As a preferred technical solution, the optical fiber connector includes an outer protective layer and an optical fiber core, with one end of the optical fiber core extending into the outer protective layer and docking with the photosensitive chip.

[0013] As a preferred technical solution, the optical flux-voltage linear converter includes a housing, with multiple sub-control switches installed on the upper surface of the housing. Each optical fiber detection corresponds to one sub-control switch. A main control board is installed inside the optical flux-voltage linear converter, and the sub-control switches are all electrically connected to the main control board.

[0014] The output terminal of the optical flux-voltage linear converter is provided with multiple signal output ports and a BNC radio frequency shielding interface. The signal output ports and the BNC radio frequency shielding interface are electrically connected to the main control board, and the electrical signal connection line is connected to the signal output port.

[0015] As a preferred technical solution, the light flux voltage linear converter also includes a lithium battery and a charging interface for charging the lithium battery, and the lithium battery is connected to the main control board.

[0016] As a preferred technical solution, the optical flux voltage linear converter is also equipped with a display screen, a main switch and a main power indicator light, all of which are electrically connected to the main control board.

[0017] As a preferred technical solution, an optical fiber fixing baffle is also fixedly installed inside the optical flux voltage linear converter. The optical signal input connector extends from the outside of the optical flux voltage linear converter into the inside of the optical flux voltage linear converter and is positioned and fixed on the optical fiber fixing baffle. The photosensitive chip is installed on the optical fiber fixing baffle. The optical fiber core of the optical fiber connector is inserted into the optical fiber guide groove on the optical fiber fixing baffle and corresponds to the photosensitive chip.

[0018] As a preferred technical solution, the test bracket is L-shaped.

[0019] The beneficial effects of this utility model are: By combining optical fiber with a light flux voltage linear converter, this utility model can accurately monitor the changes in brightness of lighting products during electromagnetic interference testing, avoiding the limitations of traditional visual monitoring, especially the inability to detect subtle changes in brightness.

[0020] This converter has the function of linearly converting changes in luminous flux into voltage signals and displaying interference fluctuations in real time via an oscilloscope, which can more intuitively and accurately reflect the optical performance of the lamp under electromagnetic interference.

[0021] In addition, this invention adopts a shielding design, and the entire testing process is carried out in a shielded room, which effectively shields external electromagnetic interference and ensures the stability and accuracy of the output signal.

[0022] Its compact structure, integrated lithium battery power supply, low power consumption, and ease of use make it suitable for portable operation and meet the needs of field testing.

[0023] With its separate control switch and multi-output design, the brightness changes of multiple lamp samples can be monitored simultaneously, further improving testing efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is the overall testing system of this utility model. Figure 1 ;

[0026] Figure 2 This is the overall testing system of this utility model. Figure 2 ;

[0027] Figure 3This is a schematic diagram of the overall structure of the optical flux-voltage linear converter of this utility model;

[0028] Figure 4 This is a cross-sectional schematic diagram of the optical flux-voltage linear converter of this utility model;

[0029] Figure 5 This is the circuit schematic diagram of this utility model;

[0030] Figure 6 A schematic diagram of the sample flashing at a frequency of 0.5 Hz;

[0031] Figure 7 and Figure 8 This refers to the normal flashing state of the sample and the abnormal brightness state of the sample after being disturbed;

[0032] Figure 9 This is a schematic diagram showing the fluctuation of the brightness (converted to voltage) of a car headlight under continuous electromagnetic interference of different frequencies.

[0033] Explanation of reference numerals in the attached figures:

[0034] 5. Test bracket; 4. Test mounting hole; 10. Fiber optic test head; 1. Electromagnetic interference device; 6. Fiber optic connector; 7. Optical flux-to-voltage linear converter; 73. Optical signal input connector; 8. Oscilloscope; 3. Corrugated flexible tube; 77. Fiber optic core wire; 72. Sub-control switch; 78. Main control board; 74. Signal output port; 9. Electrical signal connector; 79. Lithium battery; 76. Display screen; 75. Main switch; 80. Fiber optic fixing baffle; 71. Housing. Detailed Implementation

[0035] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0036] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0037] like Figure 1 and Figure 2As shown, this utility model discloses an electromagnetic interference testing system for lighting products, including a test bracket 5 for support. The test bracket 5 has multiple test mounting holes 4, and fiber optic test heads 10 can be installed in the test mounting holes 4. The fiber optic test heads 10 face the lighting fixture to be tested on one side. In this embodiment, only two fiber optic test heads 10 are installed for electromagnetic interference testing of two lighting fixtures. If more lighting fixtures need to be tested, more fiber optic test heads 10 can be installed to achieve testing of more lighting fixtures.

[0038] It also includes an electromagnetic interference device 1, which is installed on one side of the lamp under test and is used to conduct electromagnetic interference on the lamp under test. When the lamp under test is subjected to electromagnetic interference test, the electromagnetic interference device 1 is used to conduct electromagnetic interference. The entire test environment of the lamp under test is in a shielded room. The shielded room can shield external electromagnetic interference and only retain the electromagnetic interference force of the electromagnetic interference device 1, so the test accuracy can be greatly improved.

[0039] It also includes a light flux-voltage linear converter 7. The output end of the test bracket 5 is provided with an optical fiber connection line 6. One end of the optical fiber connection line 6 is connected to the test bracket 5, and the other end is connected to the optical signal input connector 73 of the light flux-voltage linear converter 7. Each optical signal input connector 73 in the light flux-voltage linear converter 7 is provided with a photosensitive chip. The photosensitive chip receives the optical signal and outputs it as an electrical signal.

[0040] It also includes an oscilloscope 8, which is connected to the optical flux-voltage linear converter 7 via an electrical signal connection line 9. The electrical signal is output to the oscilloscope 8 through the electrical signal connection line 9, and the oscilloscope 8 displays the fluctuation of electromagnetic interference. The oscilloscope 8 and the optical flux-voltage linear converter 7 can be installed in an external observation room, without the need for a shielded room. The light source of the lamps in the shielded room is guided into the observation room by the optical fiber connection line 6, and the light is converted into an electrical signal by the optical flux-voltage linear converter 7, which is then displayed on the oscilloscope 8. The whole testing process is simple and clear.

[0041] In order to allow the fiber optic test head 10 to stay in any position, in this embodiment, a corrugated flexible tube 3 is installed on the outside of the fiber optic test head 10. The corrugated flexible tube 3 can be bent into any shape and positioned. The fiber optic test head 10 is connected to the fiber optic connection line 6. The fiber optic connection line 6 is used to guide the light from the lamp to be tested to the luminous flux-voltage linear converter 7 for testing.

[0042] The optical fiber connector 6 includes an outer protective layer and an optical fiber core 77, one end of which extends into the outer protective layer and connects to the photosensitive chip.

[0043] like Figure 3 and Figure 4 As shown, the optical flux-voltage linear converter 7 includes a housing 71, and multiple sub-control switches 72 are installed on the upper surface of the housing 71. Each optical fiber detection corresponds to one sub-control switch 72. The optical flux-voltage linear converter 7 has a main control board 78 installed inside, and the sub-control switches 72 are all electrically connected to the main control board 78.

[0044] The output end of the optical flux voltage linear converter 7 is provided with multiple signal output ports 74 and a BNC radio frequency shielding interface. The signal output ports 74 and the BNC radio frequency shielding interface are electrically connected to the main control board 78, and the electrical signal connection line 9 is connected to the signal output ports 74.

[0045] The light flux voltage linear converter 7 also contains a lithium battery 79 and a charging interface for charging the lithium battery 79. The lithium battery 79 is connected to the main control board 78. The light flux voltage linear converter 7 is also equipped with a display screen 76, a main switch 75 and a main power indicator light. The display screen 76, the main switch 75 and the main power indicator light are all electrically connected to the main control board 78.

[0046] like Figure 4 As shown, an optical fiber fixing baffle 80 is also fixedly installed inside the optical flux-voltage linear converter 7. The optical signal input connector 73 extends from the outside of the optical flux-voltage linear converter 7 into the inside of the optical flux-voltage linear converter 7 and is positioned and fixed on the optical fiber fixing baffle 80. The photosensitive chip is installed on the optical fiber fixing baffle 80. The optical fiber core 77 of the optical fiber connector 6 is inserted into the optical fiber guide groove on the optical fiber fixing baffle 80 and corresponds to the photosensitive chip. The optical fiber connector 6 passes through the optical signal input connector 73 and is guided to the photosensitive chip.

[0047] In this embodiment, the test bracket 5 is L-shaped, but it can also be other shapes.

[0048] like Figure 5 As shown, the working principle of the entire system is as follows:

[0049] The circuit is powered by a 7.5-16V battery. The power supply is controlled by switch K1, and switch K2 may be used to control the branching of the load circuit.

[0050] The power supply is filtered by capacitors C1 and C2 to stabilize the input voltage signal.

[0051] The L7805CV regulator stabilizes the input voltage to 5V, providing a stable power supply for subsequent circuits.

[0052] The LED and current-limiting resistor R are used for power indication, indicating whether the circuit is powered on.

[0053] The circuit uses four TSL250R-LF photoelectric sensor modules, which are responsible for converting light signals into voltage signals. Each sensor module is grounded through its pin 1, connected to a 5V regulated output through its pin 2, and outputs the signal from its pin 3.

[0054] The input optical signal of these photoelectric sensors is transmitted through optical fiber. The optical signal triggers the photosensitive chip inside the photoelectric sensor, which converts the light flux into a voltage signal proportional to the light intensity.

[0055] The voltage signal output from pin 3 of each TSL250R-LF module is divided into four channels (V-OUT CH1 to CH4), which are connected to external measurement devices, such as an oscilloscope, via a BNC interface. This output signal is a voltage signal that is linearly related to the input luminous flux, facilitating subsequent signal monitoring and analysis.

[0056] This circuit converts the luminous flux signals of multiple luminaires into voltage signals for electromagnetic interference (EMI) testing. During testing, the light signal from the luminaire under test is transmitted via optical fiber to each photoelectric sensor module (TSL250R-LF). These sensors convert the light signal into a voltage signal and output it to the corresponding output channel. The output voltage of each sensor module is proportional to the received light intensity, and the output voltage ranges from 0V to 4V. By connecting an oscilloscope (8), changes in light intensity can be monitored in real time, thereby accurately determining the performance changes of the luminaires under EMI conditions.

[0057] The actual usage is as follows:

[0058] This solution is frequently used in laboratories, typically for radiated immunity testing (RS), handheld transmitter immunity testing (PTI), bulk current injection testing (BCI), transient conducted immunity testing (CTI), stripline testing, and Ford and Mazda RI110 testing, among others. The following details the specific applications of this converter in various testing projects:

[0059] Figure 6 The image shows the sample flashing at a frequency of 0.5 Hz (channels 1, 2, and 4 correspond to 3 lights each), where channel 1 (blue) captured one of the lights not flashing regularly. Figure 7 and Figure 8 The images show the sample in normal flickering mode and the sample with abnormal brightness after interference. Note that... Figure 8 Channel 4 (green) in the image showed a brightness change exceeding 20% ​​after being disturbed (compared to...). Figure 7 Channel 4), which is difficult to detect with the naked eye.

[0060] Figure 9This describes the fluctuation in the brightness (converted to voltage) of a vehicle headlight when it is subjected to continuous electromagnetic interference of different frequencies.

[0061] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. An electromagnetic interference immunity testing system for lighting products, characterized in that, include: A test bracket (5) is used for support. The test bracket (5) has multiple test mounting holes (4). Fiber optic test heads (10) can be installed in the test mounting holes (4). The fiber optic test heads (10) face the lamp to be tested on one side. Electromagnetic interference device (1) is installed on one side of the lamp to be tested and is used to conduct electromagnetic interference on the lamp to be tested; The optical flux-voltage linear converter (7) has an optical fiber connection line (6) at the output end of the test bracket (5). One end of the optical fiber connection line (6) is connected to the test bracket (5), and the other end is connected to the optical signal input connector (73) of the optical flux-voltage linear converter (7). Each optical signal input connector (73) in the optical flux-voltage linear converter (7) is equipped with a photosensitive chip, which receives optical signals and outputs them as electrical signals. The oscilloscope (8) is connected to the optical flux voltage linear converter (7) via an electrical signal connection line (9). The electrical signal is output to the oscilloscope (8) through the electrical signal connection line (9) and the oscilloscope (8) displays the fluctuation of electromagnetic interference.

2. The electromagnetic interference testing system for lighting products according to claim 1, characterized in that: A corrugated hose (3) is installed on the outside of the fiber optic test head (10). The corrugated hose (3) can be bent into any shape and positioned. The fiber optic test head (10) is connected to the fiber optic connector (6). The fiber optic connector (6) is used to guide the light from the lamp to be tested to the luminous flux-voltage linear converter (7) for testing.

3. The electromagnetic interference testing system for lighting products according to claim 2, characterized in that: The optical fiber connector (6) includes an outer protective layer and an optical fiber core (77), one end of which extends into the outer protective layer and is connected to the photosensitive chip.

4. The electromagnetic interference testing system for lighting products according to claim 1, characterized in that: The optical flux voltage linear converter (7) includes a housing (71), and multiple sub-control switches (72) are installed on the upper surface of the housing (71). Each optical fiber detection corresponds to one sub-control switch (72). The optical flux voltage linear converter (7) has a main control board (78) installed inside, and the sub-control switches (72) are all electrically connected to the main control board (78). The output end of the optical flux voltage linear converter (7) is provided with multiple signal output ports (74) and a BNC radio frequency shielding interface. The signal output ports (74) and the BNC radio frequency shielding interface are electrically connected to the main control board (78), and the electrical signal connection line (9) is connected to the signal output ports (74).

5. The electromagnetic interference immunity testing system for lighting products according to claim 4, characterized in that: The light flux voltage linear converter (7) also contains a lithium battery (79) and a charging interface for charging the lithium battery (79), which is connected to the main control board (78).

6. The electromagnetic interference immunity testing system for lighting products according to claim 4, characterized in that: The optical flux voltage linear converter (7) is also equipped with a display screen (76), a main switch (75) and a main power indicator light, all of which are electrically connected to the main control board (78).

7. The electromagnetic interference immunity testing system for lighting products according to claim 1, characterized in that: The optical flux-voltage linear converter (7) is also fixedly installed with an optical fiber fixing baffle (80). The optical signal input connector (73) extends from the outside of the optical flux-voltage linear converter (7) into the inside of the optical flux-voltage linear converter (7) and is positioned and fixed on the optical fiber fixing baffle (80). The photosensitive chip is installed on the optical fiber fixing baffle (80). The optical fiber core wire (77) of the optical fiber connector (6) is inserted into the optical fiber guide groove on the optical fiber fixing baffle (80) and corresponds to the photosensitive chip.

8. The electromagnetic interference immunity testing system for lighting products according to claim 1, characterized in that: The test bracket (5) is L-shaped.

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