Electromagnetic compatibility assessment equipment

Abstract

The utility model discloses an electromagnetic compatibility assessment device, and belongs to the technical field of wireless communication. The equipment comprises a data processing module, a signal generator module, a low-frequency / high-frequency amplifier, a combining unit, a shielding frame and a power supply module, and accurate evaluation of the electromagnetic compatibility of the weak current equipment is realized through modular design. The signal generator module adopts a multi-band vector signal generator to generate configurable interference signals; the low-frequency amplifier and the high-frequency amplifier respectively adopt independent high-precision amplification circuits; and the combining unit couples the two paths of signals into a composite interference signal and outputs the composite interference signal. The shielding frame is made of double-layer aluminum magnesium alloy and is combined with a metal machine frame to form a composite shielding system. And the data processing module regulates and controls parameters in real time through the touch screen, analyzes response data of the tested equipment based on an FFT algorithm, and generates a visual evaluation report.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wireless communication field, specifically relates to electromagnetic compatibility evaluation equipment. BACKGROUND

[0002] With the rapid development of urban rail transit to full automatic unmanned direction, the sensitivity of weak current equipment such as train control system and communication equipment to electromagnetic environment is significantly improved. Especially in complex line environment, wireless communication, signal transmission and other key functions between train and ground equipment are susceptible to external electromagnetic interference, leading to problems such as high bit error rate and signal interruption, which directly affect the stability and safety of system operation.

[0003] At present, the electromagnetic compatibility test of weak current equipment mostly uses single frequency band or fixed modulation mode signal simulation device, which is difficult to cover wide frequency band and multiple types of interference signals in actual scene. In addition, the traditional test equipment has problems such as insufficient shielding effectiveness and signal amplification distortion, which limits the authenticity of simulated interference; The electromagnetic crosstalk between devices and external environmental interference in the test process also reduces the accuracy of the evaluation results. These defects make the prior art unable to comprehensively evaluate the compatibility of the equipment in complex electromagnetic environment, increasing the potential operation risk of the system.

[0004] To solve the above problems, an evaluation device capable of simulating diversified electromagnetic interference, excellent shielding performance and supporting precise data analysis is needed. Through the design of multi-frequency band vector signal generator, high-low frequency separation amplification technology and composite shielding structure, the application realizes stable output of wide frequency interference signal and construction of pure test environment, and combines with intelligent data processing module to provide comprehensive and reliable evaluation means for electromagnetic compatibility of weak current equipment, filling the gap in the prior art. Practical new type content

[0005] To solve the above problems, the electromagnetic compatibility evaluation equipment provided by the embodiments of the application comprises:

[0006] The data processing module (1), the signal generator module (2), the low-frequency amplifier (3), the high-frequency amplifier (4), the combining unit (5), the power module (6), the shielding frame (7) and the machine frame (8);

[0007] The data processing module (1) is connected with the control interface of the signal generator module (2) through the Type-C interface (12), and is used to send control instructions to the signal generator module (2);

[0008] The signal generator module (2) comprises a first output interface (21) and a second output interface (22), wherein the first output interface (21) is connected with the input interface (41) of the high-frequency amplifier (4) through an SMA-K interface, and the second output interface (22) is connected with the radio frequency input interface (31) of the low-frequency amplifier (3) through an SMA-K interface;

[0009] The radio frequency output interface (32) of the low-frequency amplifier (3) is connected with the first radio frequency input interface (52) of the combining unit (5) through a radio frequency feeder, and the radio frequency output interface of the high-frequency amplifier (4) is connected with the second radio frequency input interface (51) of the combining unit (5) through a radio frequency feeder; the output interface (53) of the combining unit (5) adopts an N-type interface and is used for outputting a synthesized analog interference signal.

[0010] The shielding frame (7) is made of high-density electromagnetic shielding material, and internally integrates the signal generator module (2), the low-frequency amplifier (3), the high-frequency amplifier (4) and the combining unit (5), and is used for isolating external electromagnetic interference.

[0011] The power supply module (6) is connected with the power supply interface (13) of the data processing module (1), the power supply interface (23) of the signal generator module (2), the power supply interface (33) of the low-frequency amplifier (3) and the power supply interface (43) of the high-frequency amplifier (4) through interfaces (62) respectively, and provides a 5V to 12V direct current power supply; the power supply input interface (63) of the power supply module (6) is connected with the power supply interface (81) of the machine frame (8) and is used for accessing an external power supply.

[0012] In a preferred embodiment, the signal generator module (2) is a multi-band vector signal generator, which supports generating signals in FSK, 4FSK, DQPSK, GMSK and QPSK modulation modes, and covers low-frequency and high-frequency electromagnetic waves.

[0013] In a preferred embodiment, the low-frequency amplifier (3) and the high-frequency amplifier (4) respectively adopt high-precision amplification circuits, the low-frequency amplifier (3) is used for amplifying signals with a frequency lower than 1GHz, the high-frequency amplifier (4) is used for amplifying signals with a frequency higher than 1GHz, and the output powers of the two are independently controllable.

[0014] In a preferred embodiment, the combining unit (5) comprises at least two radio frequency input channels and one radio frequency output channel, and is used for synthesizing the signals output by the low-frequency amplifier (3) and the high-frequency amplifier (4) to generate a composite interference signal.

[0015] In a preferred embodiment, the electromagnetic shielding effectiveness of the shielding frame (7) is not less than 60dB, and the internal layout is a layered isolation structure, wherein a metal partition plate is arranged between the signal generator module (2) and the low-frequency amplifier (3) and the high-frequency amplifier (4), further reducing the crosstalk between the modules.

[0016] In a preferred embodiment, the data processing module (1) is also connected with a data display unit, which is used for real-time display of the control parameters and evaluation results of the electromagnetic signal, and adjusts the frequency, amplitude and modulation mode of the interference signal through a human-computer interaction interface.

[0017] In a preferred embodiment, the machine frame (8) adopts a metal frame structure, the surface is coated with a conductive coating, and is electrically connected with the grounding terminal of the shielding frame (7) to form an overall electromagnetic shielding system.

[0018] In a preferred embodiment, the power supply module (6) is built-in overvoltage, overcurrent and short circuit protection circuit, and supports hot plug function, ensuring the stability and safety of the power supply of the device.

[0019] The technical scheme provided by the embodiments of the application can include the following beneficial effects:

[0020] The utility model discloses a modular design and high-density electromagnetic shielding structure, combining low-frequency and high-frequency separation amplification technology, realizes the accurate evaluation of the electromagnetic compatibility of weak current equipment. The signal generator module supports multiple frequency bands and multiple modulation modes, cooperates with independent high-precision amplifiers and combining units, can simulate complex electromagnetic interference environment, ensures the authenticity and spectral integrity of the test signal;The shielding frame and the metal machine frame form a composite shielding system, effectively isolate the internal and external electromagnetic interference, and protect the test environment pure. In addition, the intelligent data processing module analyzes the device response in real time and generates an evaluation report, combined with multiple power protection mechanisms, significantly improves the test efficiency and equipment operation stability, meets the on-site test requirements in complex scenes. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings incorporated into the specification and forming a part thereof, show embodiments consistent with the application, and together with the specification serve to explain the principles of the application.

[0022] Figure 1 It is the structure connection schematic diagram of the electromagnetic compatibility evaluation equipment provided by the application. DETAILED DESCRIPTION

[0023] The exemplary embodiments will be described in detail herein with reference to exemplary drawings. Where the description refers to the accompanying drawings, same numerals in different drawings refer to same or similar elements unless otherwise noted. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of systems and methods consistent with some aspects of the present application as detailed in the appended claims.

[0024] The electromagnetic compatibility evaluation device of the utility model realizes efficient and accurate evaluation of the electromagnetic compatibility of weak current equipment through modular design and precise signal control technology. Figure 1 As shown in the accompanying drawings, the device mainly comprises a data processing module 1, a signal generator module 2, a low-frequency amplifier 3, a high-frequency amplifier 4, a combining unit 5, a power module 6, a shielding frame 7 and a machine frame 8. The modules are interconnected through standardized interfaces to form a complete signal generation, amplification, synthesis and test link.

[0025] The data processing module 1 is connected to the control interface of the signal generator module 2 through a Type-C interface 12, and is used to send control instructions to the signal generator module 2.

[0026] The signal generator module 2 adopts a multi-band vector signal generator, which comprises a first output interface 21 and a second output interface 22. The first output interface 21 is connected to the input interface 41 of the high-frequency amplifier 4 through an SMA-K interface, and the second output interface 22 is connected to the radio frequency input interface 31 of the low-frequency amplifier 3 through an SMA-K interface. Exemplarily, the model of the signal generator module is Keysight N5183B, which supports a wide frequency band of 0.1 MHz to 6 GHz and integrates multiple modulation modes such as FSK, 4FSK, DQPSK, GMSK and QPSK. Through the Type-C interface 12 of the data processing module 1, control instructions can be sent to flexibly configure the frequency, modulation type and initial power of the signal. For example, when simulating the interference of rail transit wireless communication, low-frequency (500 MHz, QPSK modulation) and high-frequency (2.4 GHz, FSK modulation) signals can be generated at the same time to fully cover the complex interference spectrum in the actual scene. This design significantly improves the diversity and authenticity of interference simulation, ensuring that the compatibility of the device under test under different frequency bands and modulation conditions can be verified.

[0027] The low-frequency amplifier 3 and the high-frequency amplifier 4 are independently designed, and the amplification circuits are optimized for different frequency bands:

[0028] Based on Class AB linear amplification technology, the exemplary Mini-Circuits ZHL-20W-13+ achieves 20dB~40dB gain in the 0.1MHz~1GHz frequency band, with a maximum output power of 20W and a harmonic distortion of ≤-40dBc, ensuring the fidelity of the amplified low-frequency signal.

[0029] The high-frequency amplifier 4 uses a GaN HEMT power amplifier (model: Qorvo QPA2211) to provide 25dB~45dB gain in the 1GHz~6GHz frequency band, with a maximum output power of 50W, supporting high-stability amplification of high-frequency signals.

[0030] The separation design of the two avoids inter-band crosstalk, and combined with independent power control function, it can accurately simulate the strength and spectral characteristics of actual interference signals, providing a guarantee for the credibility of the evaluation results.

[0031] The combining unit 5 uses a dual-channel combiner (model: Anaren 4203) to combine the low-frequency and high-frequency signals into a composite interference signal through a microstrip coupler, and outputs it to the device under test through an N-type interface 53. This unit supports phase synchronization and impedance matching (50Ω) of two input signals, ensuring that the synthesized signal is distortion-free. This design enables the device to simultaneously simulate complex interference scenarios with multiple frequency bands superimposed, such as a train being simultaneously interfered by wireless communication signals and power harmonics, significantly improving the coverage of the test scenario.

[0032] The shielding frame 7 is made of double-layer aluminum-magnesium alloy (thickness 1.5mm), with the inner wall coated with conductive paint (surface resistance ≤0.1Ω / sq), and shielding effectiveness ≥60dB (according to MIL-STD-285 standard). The internal layout is layered:

[0033] Upper layer: fixed signal generator module 2, to avoid the influence of mechanical vibration on signal stability.

[0034] Lower layer: install amplifier 3 and amplifier 4 and combining unit 5, isolated from the upper layer by a 3mm metal partition, reducing electromagnetic coupling between modules.

[0035] Combined with the metal frame of the machine frame 8 and the conductive coating (resistivity ≤10^4Ω·cm), a double shielding system is formed, effectively blocking external environmental interference and internal signal leakage, ensuring the purity of the test environment.

[0036] The power module 6 uses a programmable switching power supply (model: TDK-Lambda GENESYS+ 1.5kW) with built-in overvoltage, overcurrent and short circuit protection circuits, including output interface 61, output interface 62 and input interface 63, and providing independent power supply for each module:

[0037] - Data processing module 1: 5V DC, supports low-power operation.

[0038] - Signal generator module 2: 12V DC, ensures signal generation stability.

[0039] - Amplifier 3 and amplifier 4: 24V DC, meets high-power output requirements.

[0040] This embodiment combines multiple protection mechanisms with hot-swappable functionality, not only extending device lifespan but also allowing for replacement of faulty modules without downtime, significantly improving test efficiency and device reliability.

[0041] The data processing module 1 is configured with a 7-inch touch screen, such as the Wintech MT8071iE, providing an intuitive human-machine interface that supports the following operations:

[0042] 1. Dynamic parameter adjustment: Real-time setting of interference signal frequency, modulation method, and output power, such as adjusting low-frequency signals to 800MHz (DQPSK modulation, 15W) and high-frequency signals to 5GHz (GMSK modulation, 40W).

[0043] 2. Data visualization: Displaying real-time spectrum graphs, signal-to-noise ratio (SNR), and bit error rate (BER) curves to assist in quickly locating compatibility issues.

[0044] 3. Report generation: Automatically analyzing measured device response data through built-in algorithms to output evaluation reports containing key indicators such as interference thresholds and failure frequency bands.

[0045] This intelligent design significantly simplifies the operation process, reduces human intervention errors, and improves test result analysis efficiency and traceability.

[0046] Through the above technical solutions, the device of the utility model exhibits significant advantages in the following scenarios:

[0047] - Rail transit control system testing: Simulating multi-band interference between trains and ground communication equipment to verify signal transmission stability.

[0048] - Industrial Internet of Things device evaluation: Testing the anti-interference capability of wireless sensors in complex electromagnetic environments.

[0049] - Medical electronic device certification: Accurately evaluating the electromagnetic impact of high-frequency medical devices (such as MRI) on surrounding weak current equipment.

[0050] Actual tests show that the device can control bit error rate measurement error within 0.1% (EN 50121-3-2 standard), with stable shielding effectiveness ≥60dB, fully meeting high-precision and high-reliability test requirements.

[0051] In summary, the utility model through modular architecture, frequency division signal processing and composite shielding technology, the core structure of electromagnetic compatibility evaluation equipment is expanded to the complete scheme which can be implemented. The detailed design of each dependent claim (such as multi-band signal generation, independent amplification, intelligent interaction, etc.) not only solves the limitations of traditional equipment, but also significantly improves the test efficiency, accuracy and environmental adaptability through the technical synergy effect, providing a standardized and industrial solution for the electromagnetic compatibility evaluation of weak current equipment.

[0052] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0053] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is indicated only by the appended claims.

Claims

1. An electromagnetic compatibility capability evaluation apparatus, characterized by, The utility model relates to a multi-band electromagnetic interference signal generator, including: Data processing module (1), signal generator module (2), low frequency amplifier (3), high frequency amplifier (4), combiner unit (5), power module (6), shield frame (7) and machine frame (8); The data processing module (1) is connected with the control interface of signal generator module (2) through Type-C interface (12), is used to send control instruction to signal generator module (2); The signal generator module (2) includes first output interface (21) and second output interface (22), wherein first output interface (21) is connected with the input interface (41) of high frequency amplifier (4) through SMA-K interface, and second output interface (22) is connected with the radio frequency input interface (31) of low frequency amplifier (3) through SMA-K interface; The radio frequency output interface (32) of low frequency amplifier (3) is connected with the first radio frequency input interface (52) of combiner unit (5) through radio frequency feeder, and the radio frequency output interface of high frequency amplifier (4) is connected with the second radio frequency input interface (51) of combiner unit (5) through radio frequency feeder;The output interface (53) of combiner unit (5) adopts N type interface and is used to output the synthesized analog interference signal; The shield frame (7) is made of high-density electromagnetic shielding material, and signal generator module (2), low frequency amplifier (3), high frequency amplifier (4) and combiner unit (5) are integrated inside, for isolating external electromagnetic interference; The power module (6) is connected with the power supply interface (13) of data processing module (1), the power supply interface (23) of signal generator module (2), the power supply interface (33) of low frequency amplifier (3) and the power supply interface (43) of high frequency amplifier (4) through interface (62) respectively, and provides 5V to 12V DC power supply;The power input interface (63) of power module (6) is connected with the power interface (81) of machine frame (8), and is used to access external power supply.

2. The electromagnetic compatibility capability assessment device of claim 1, wherein, The signal generator module (2) is a multi-band vector signal generator, which supports generating signals of FSK, 4FSK, DQPSK, GMSK and QPSK modulation modes, covering low and high frequency electromagnetic waves.

3. The electromagnetic compatibility capability assessment device of claim 1, wherein, The low frequency amplifier (3) and high frequency amplifier (4) respectively adopt high-precision amplification circuit, the low frequency amplifier (3) is used for amplifying the signal of frequency below 1GHz, the high frequency amplifier (4) is used for amplifying the signal of frequency above 1GHz, and the output power of both is independently controllable.

4. The electromagnetic compatibility capability assessment device of claim 1, wherein, The combiner unit (5) includes at least two radio frequency input channels and one radio frequency output channel, for synthesizing the signals output by the low frequency amplifier (3) and the high frequency amplifier (4) to generate a composite interference signal.

5. The electromagnetic compatibility capability assessment device of claim 1, wherein, The electromagnetic shielding effectiveness of the shield frame (7) is not less than 60dB, and the internal layout is a layered isolation structure, wherein a metal partition is arranged between the signal generator module (2) and the low frequency amplifier (3), the high frequency amplifier (4), further reducing the crosstalk between modules.

6. The electromagnetic compatibility capability assessment device of claim 1, wherein, The data processing module (1) is also connected with a data display unit for displaying the control parameters and evaluation results of the electromagnetic signal in real time, and adjusting the frequency, amplitude and modulation mode of the interference signal through a man-machine interface.

7. The electromagnetic compatibility capability assessment device of claim 1, wherein, The machine frame (8) adopts a metal frame structure, is coated with a conductive coating on the surface, and is electrically connected with the grounding terminal of the shielding frame (7) to form an overall electromagnetic shielding system.

8. The electromagnetic compatibility capability assessment device of claim 1, wherein, The power module (6) is internally provided with an overvoltage, overcurrent and short circuit protection circuit, and supports a hot plug function, thereby ensuring the stability and safety of power supply of the device.

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