Command vehicle rack-mounted power management system

Abstract

The invention discloses a command vehicle rack-mounted power supply management system, and the system comprises a power supply filtering module which carries out the filtering of power supply input, and removes the high-frequency electromagnetic interference possibly carried by a power line; the electromagnetic shielding module is used for shielding electromagnetic radiation inside and outside the system; the grounding management module is used for providing a unified grounding point of the system and ensuring that all electrical connections have the same potential so as to reduce electromagnetic interference generated by the difference of the grounding point; the signal transmission optimization module is used for ensuring that signal transmission channels inside and outside the system are not influenced by electromagnetic interference; the electromagnetic interference suppression module is used for suppressing transient high-frequency interference generated in the system; and the environment monitoring and feedback module is used for monitoring electromagnetic environments inside and outside the rack in real time and automatically adjusting an EMC protection strategy of the system according to monitoring data so as to adapt to different working conditions. The command vehicle can adapt to a complex electromagnetic environment and ensure stable operation of equipment in the command vehicle.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle detection, and in particular to a rack-type power management system for a command vehicle. Background Art

[0002] The rack-mounted power management system is a device designed specifically for data centers, server rooms, and other environments that require centralized management of power distribution. It is usually installed in a standard 19-inch rack and is used to distribute, monitor, and manage the power load in the rack. The emergency detection command vehicle has functions such as detection, command, early warning, emergency rescue, and life. Government departments, emergency command centers, and other early warning and rescue forces can quickly, timely, and accurately collect detection information from the accident site, and conduct rapid and scientific command based on the detection information to improve the safety factor and speed of emergency rescue. However, when the rack-mounted power management system is installed on the command vehicle, electromagnetic compatibility must be considered when there are a large number of communication and monitoring equipment in the command vehicle to reduce and prevent electromagnetic interference (EMI) from affecting the normal operation of other equipment. Summary of the invention

[0003] This application aims to provide a complete electromagnetic compatibility (EMC) solution for the rack-mounted power management system in the command vehicle to reduce and prevent the impact of electromagnetic interference (EMI) on other devices. The system consists of multiple modules, each of which implements specific functions through technical means and is closely related to other modules to form a comprehensive EMC protection system.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A command vehicle rack-mounted power management system, comprising:

[0006] Power filter module: Filters the power input to remove high-frequency electromagnetic interference that may be carried on the power line, thereby effectively suppressing high-frequency noise;

[0007] Electromagnetic shielding module: Shields electromagnetic radiation inside and outside the system to prevent electromagnetic waves generated by equipment in the rack from affecting other equipment, and also prevents external interference from entering the system;

[0008] Grounding management module: used to provide a unified grounding point for the system, ensuring that all electrical connections have the same potential, thereby reducing electromagnetic interference caused by differences in grounding points;

[0009] Signal transmission optimization module: used to ensure that the signal transmission channels inside and outside the system are not affected by electromagnetic interference;

[0010] Electromagnetic interference suppression module: used to suppress transient high-frequency interference generated in the system;

[0011] Environmental monitoring and feedback module: used to monitor the electromagnetic environment inside and outside the rack in real time, and automatically adjust the system's EMC protection strategy based on the monitoring data to adapt to different working conditions.

[0012] Further: the power supply filter module includes:

[0013] A common mode filter and a differential mode filter, wherein the common mode filter comprises a common mode choke for suppressing common mode interference; and the differential mode filter comprises a capacitor array and an inductor for suppressing differential mode interference.

[0014] Further: the electromagnetic shielding module includes:

[0015] Shielding cover: The shielding cover surrounds the equipment in the rack to prevent electromagnetic leakage. Conductive gaskets are used to seal the seams of the shielding cover to ensure electrical continuity and shielding effectiveness.

[0016] Further: the grounding management module includes:

[0017] All modules are connected to one main grounding point via a dedicated grounding wire to avoid potential differences between multiple grounding points, thus preventing the formation of ground loops.

[0018] Further: the signal transmission optimization module includes:

[0019] First, differential signal transmission is adopted to transmit signals with opposite phases through two parallel wires. At the same time, the radiation and anti-interference capabilities of the signal line are reduced by using shielded twisted pair and coaxial cable.

[0020] Further: the electromagnetic interference suppression module includes:

[0021] Transient voltage suppression diodes are used to clamp overvoltage pulses to prevent high-frequency interference pulses from being transmitted to other parts of the system. When the transient high-frequency interference voltage generated in the system exceeds the breakdown voltage of the transient voltage suppression diode, the transient voltage suppression diode conducts and clamps the voltage at , thereby effectively suppressing the propagation of transient high-frequency interference.

[0022] Metal oxide varistors are used to absorb high-energy transient pulses; MOVs are in a high-resistance state under normal operating voltage, but when the voltage exceeds the threshold, their impedance drops sharply, thereby absorbing interference energy;

[0023] EMI absorbing materials are placed near the interference source within the system. They absorb high-frequency interference noise through their high magnetic permeability and reduce the spread of electromagnetic radiation.

[0024] Further: the environmental monitoring and feedback module includes:

[0025] Electromagnetic field sensors, noise detectors and embedded control systems. Electromagnetic field sensors are used to monitor the strength of electric and magnetic fields. Noise detectors are used to monitor electromagnetic noise in the system. Their measurement data is used to reflect the strength of interference signals in each frequency band. By performing frequency domain analysis on the collected electromagnetic environment data, the environmental monitoring and feedback module can identify the frequency range of interference sources and their intensity distribution.

[0026] The embedded control system is used to process the data from sensors and detectors, and dynamically adjust the system's EMC protection strategy based on the analysis results. First, the collected data is preprocessed to filter out noise, and a power spectrum density analysis is performed to determine the main frequency band and amplitude of the electromagnetic interference. After determining the interference frequency band, the parameters of other modules are adjusted through a closed-loop control algorithm.

[0027] Compared with the prior art, the present invention has the following technical advances:

[0028] This application adopts multi-level electromagnetic interference suppression measures, including power supply filtering, shielding, grounding management, signal transmission optimization and electromagnetic interference suppression modules. By suppressing and absorbing electromagnetic interference at different levels, the impact of electromagnetic interference is comprehensively reduced from the source to the transmission path and then to the inside of the system. This multi-level interference suppression strategy can ensure the stability of the system in a complex electromagnetic environment. The environmental monitoring and feedback module can monitor the electromagnetic environment inside and outside the rack in real time, and automatically adjust the system's EMC protection strategy through an embedded control system. Based on real-time monitoring data, the system can dynamically adjust the filter's cutoff frequency, shielding effectiveness, and response parameters of the suppression module to adapt to different working conditions. This dynamic adjustment capability enables the system to always maintain optimal electromagnetic compatibility in different electromagnetic environments.

[0029] The environmental monitoring and feedback module forms a closed-loop control system with other modules to monitor and adjust the working status of each module in real time. This closed-loop control mechanism ensures that the system can quickly respond to changes in the external electromagnetic environment and make corresponding adjustments, thereby improving the efficiency and effectiveness of anti-interference. This application adopts a modular design, and the functions of each module are clear and closely related to each other, which is convenient for customization and expansion. This modular design not only enhances the system's ability to resist electromagnetic interference, but also improves the compatibility and maintainability of the system. The system can increase, decrease or optimize modules according to actual needs, and flexibly respond to different electromagnetic interference challenges. This application adopts single-point grounding management to avoid the formation of ground loops and effectively reduce the electromagnetic interference caused by differences in grounding points. In addition, the synergy of the unified grounding point with the shielding module and the filtering module further enhances the system's ability to resist electromagnetic interference and ensures the potential consistency of the electrical connection.

[0030] The electromagnetic shielding module effectively blocks electromagnetic interference inside and outside the system by using highly conductive materials and comprehensive shielding design, which not only protects the internal equipment of the system from external interference, but also prevents the electromagnetic radiation inside the system from interfering with other equipment. The comprehensiveness and efficiency of the shielding measures provide reliable electromagnetic compatibility protection for the system. The signal transmission optimization module uses shielded twisted pair, coaxial cable and differential signal transmission technology to further reduce the radiation and anti-interference ability of the signal line. This efficient signal transmission optimization strategy is particularly prominent in an environment where high-frequency communication equipment coexists, ensuring the stability and reliability of signal transmission. The electromagnetic interference suppression module can quickly respond to and suppress transient high-frequency interference through components such as TVS diodes, MOVs and ferrite magnetic rings. This transient interference suppression capability is very effective in dealing with the startup of high-power equipment or transient pulse interference, ensuring the anti-interference ability of the system.

[0031] In summary, the present application demonstrates a strong comprehensive ability in resisting electromagnetic interference, can adapt to complex electromagnetic environments and ensure the stable operation of equipment in the command vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0033] In the attached picture:

[0034] Figure 1 It is a system structure diagram of the present invention. DETAILED DESCRIPTION

[0035] The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. The embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0036] like Figure 1 As shown, the present invention discloses a command vehicle rack-mounted power management system, comprising:

[0037] The power filter module has the main function of filtering the power input and removing the high-frequency electromagnetic interference (EMI) that may be carried on the power line. By configuring common-mode and differential-mode filters at the power input end, effective suppression of high-frequency noise is achieved. In this embodiment, a low-pass filter design is adopted, combined with a common-mode choke and a capacitor array, which can effectively filter out high-frequency interference signals on the power line. The power filter module is directly connected to the power input end of the system to ensure that the power entering the system is clean and noise-free, reducing interference to subsequent modules from the source.

[0038] The electromagnetic shielding module is responsible for shielding electromagnetic radiation inside and outside the system to prevent electromagnetic waves generated by the equipment in the rack from affecting other equipment, and also prevent external interference from entering the system. In this embodiment, a shielding cover made of highly conductive materials (such as copper or galvanized steel plates) is used, and shielding gaskets and grounding connections are installed at key parts of the rack to form a complete shielding system. The electromagnetic shielding module covers the entire rack system, especially directly connected to the high-frequency signal module, power filter module, and sensitive equipment module to ensure that the shielding effect covers all possible electromagnetic leakage points.

[0039] The function of the grounding management module is to provide a unified grounding point for the system and ensure that all electrical connections have the same potential, thereby reducing electromagnetic interference (EMI) caused by differences in grounding points. In this embodiment, a single-point grounding system is designed, and all modules and shielding layers are connected to a main grounding point to avoid the formation of ground loops. The grounding wire material is made of low-resistance, high-conductivity copper wire to ensure the reliability of grounding. The grounding management module is directly connected to the electromagnetic shielding module, power filter module, and signal transmission module to form a unified grounding network to ensure that the potential of all devices is consistent.

[0040] The signal transmission optimization module aims to ensure that the signal transmission channels inside and outside the system are not affected by electromagnetic interference, especially when coexisting with high-frequency communication equipment. In this embodiment, low-noise cables such as shielded twisted pair cables and coaxial cables are used for signal transmission, and differential signal transmission technology is used to reduce the radiation and anti-interference ability of the signal line. At the same time, a small EMI filter is installed at the interface where the signal line enters the rack to further reduce interference. The signal transmission optimization module works closely with the electromagnetic shielding module to ensure that all signal lines are properly shielded and connected to the grounding management module to ensure electrical isolation and stability of signal transmission.

[0041] Electromagnetic interference suppression module, the electromagnetic interference suppression module is specifically used to suppress transient high-frequency interference that may be generated in the system, such as interference pulses generated when the switching power supply or high-power equipment is started. In this embodiment, transient voltage suppression diodes (TVS diodes) and metal oxide varistors (MOVs) are configured at the input and output ends of key equipment in the system (such as switching power supply modules) to absorb and suppress high-frequency interference pulses. At the same time, EMI absorbing materials (such as ferrite magnetic rings) are configured to absorb high-frequency noise near the interference source. The electromagnetic interference suppression module works in conjunction with the power supply filter module to ensure that transient interference within the system is suppressed, and works with the grounding management module to prevent interference from being transmitted to other parts.

[0042] Environmental monitoring and feedback module, the function of the environmental monitoring and feedback module is to monitor the electromagnetic environment inside and outside the rack in real time, and automatically adjust the system's EMC protection strategy according to the monitoring data to adapt to different working conditions. In this embodiment, an electromagnetic field sensor and a noise detector are equipped to collect electromagnetic environment data in real time. The data is analyzed through an embedded control system, and the working state of each module is adjusted (such as adjusting the cutoff frequency or shielding level of the filter). The environmental monitoring and feedback module is connected to all other modules to form a closed-loop control system, which dynamically adjusts the electromagnetic compatibility strategy according to real-time environmental data to optimize the overall EMC performance of the system.

[0043] 1. The power filter module processes the power input to ensure that subsequent modules will not be affected by high-frequency interference on the power line.

[0044] 2. The electromagnetic shielding module fully shields the electromagnetic radiation inside and outside the rack, and cooperates with the grounding management module to ensure that electromagnetic interference does not spread.

[0045] 3. The grounding management module provides unified grounding, supports the electrical connection of all modules, and prevents ground loops and grounding point potential differences.

[0046] 4. The signal transmission optimization module uses shielded cable and differential signal technology to ensure the integrity of signal transmission under electromagnetic shielding and grounding protection.

[0047] 5. The electromagnetic interference suppression module suppresses transient high-frequency interference at key equipment, and works together with the power filtering and grounding management modules to protect system stability.

[0048] 6. The environmental monitoring and feedback module monitors and dynamically adjusts the system's EMC strategy in real time, and collaborates with all other modules to ensure that the system maintains optimal electromagnetic compatibility in any environment.

[0049] This design forms a complete electromagnetic compatibility solution through multi-module collaboration, from power input, signal transmission to environmental monitoring, effectively reducing and preventing the impact of electromagnetic interference on other equipment in the command vehicle.

[0050] Specifically, the power filter module:

[0051] In order to effectively filter out high-frequency electromagnetic interference (EMI) on the power line, the power filter module suppresses noise signals by designing common-mode and differential-mode filters. Common-mode interference and differential-mode interference are two main forms of EMI, which appear as in-phase signals and anti-phase signals respectively. Common-mode filters are mainly used for common-mode interference, while differential-mode filters are used for differential-mode interference.

[0052] 1. Common mode choke design

[0053] Common mode choke is a key component in the filter, used to suppress common mode interference. Its working principle is to use the magnetic flux in the magnetic core to offset the common mode current. For differential mode current, the magnetic flux on the two windings of the common mode choke is in opposite directions, and the generated magnetic flux cancels each other out, which will not affect the transmission of normal signals. The core material selects high magnetic permeability materials, such as ferrite, to improve the suppression effect. The calculation formula of the inductance value L of the common mode choke is:

[0054]

[0055] Where: N is the number of turns of the winding; μ is the magnetic permeability of the core; A is the cross-sectional area of ​​the core; l is the effective magnetic path length of the core.

[0056] By selecting appropriate core materials and winding parameters, the inductance value of the common-mode choke can be optimized to effectively suppress high-frequency common-mode interference.

[0057] 2. Differential mode filter design

[0058] The differential mode filter is mainly composed of a capacitor array and an inductor, and is used to suppress differential mode interference. The design of the differential mode filter adopts a low-pass filter structure, allowing DC and low-frequency signals to pass through while blocking high-frequency interference signals. Its typical structure is a π-type filter, which consists of two capacitors and an inductor. For the differential mode filter, its transfer function H(s) can be expressed as:

[0059]

[0060] Wherein: s=jω is the complex frequency; L is the inductance value in the differential mode filter; and C is the total capacitance value of the capacitor array.

[0061] The selection of inductor L and capacitor C needs to meet the following conditions to suppress high-frequency interference within a specific frequency range:

[0062]

[0063] where ω c is the cutoff frequency of the filter. By adjusting the values ​​of L and C, the operating frequency range of the filter can be set to ensure good attenuation characteristics in the high frequency band.

[0064] After the common-mode and differential-mode filters are designed, the power filter module integrates these components into the filter circuit at the power input. To ensure the effectiveness of the filter, the module design will undergo a series of tests, including frequency response tests and EMI suppression effect tests, to ensure that the filter has sufficient attenuation capability within the target frequency band. The test results are used to adjust the design parameters of the filter to optimize its performance and ensure that the power entering the system is clean and noise-free, reducing interference to subsequent modules from the source. This design strategy ensures that the power filter module plays an effective electromagnetic compatibility (EMC) role in the overall system.

[0065] Specifically, electromagnetic shielding module:

[0066] The core of the electromagnetic shielding module lies in selecting suitable high-conductivity materials and designing an effective shielding structure to prevent the leakage and intrusion of electromagnetic radiation. Generally, copper and galvanized steel plates are ideal choices for shielding covers due to their excellent conductivity and corrosion resistance.

[0067] Shielding effectiveness (SE) is a key indicator to measure the performance of shielding materials. It is defined as the shielding material's ability to attenuate electromagnetic waves. The formula for shielding effectiveness SE is:

[0068]

[0069] in:

[0070] E1 and E2 are the electric field strengths before and after shielding, respectively;

[0071] H1 and H2 are the magnetic field strengths before and after shielding, respectively;

[0072] P1 and P2 are the power densities before and after shielding, respectively.

[0073] Shielding effectiveness can also be decomposed into the material's reflection loss R, absorption loss A and multiple reflection loss M. Its total shielding effectiveness can be expressed as:

[0074] SE=R+A+M

[0075] For high-frequency electromagnetic waves, the reflection effect of the material is more significant, so highly conductive materials such as copper are selected to maximize the reflection loss R.

[0076] 1. Shielding cover design

[0077] The geometric structure of the shielding cover is also crucial to the electromagnetic shielding effect. The shielding cover should completely surround the key equipment in the rack to prevent electromagnetic leakage. Its design needs to take into account possible gaps and seams, which are the main channels for electromagnetic wave leakage.

[0078] According to the Faraday cage principle, the shielding cover needs to have as few openings as possible, and all seams should be closed with conductive gaskets or shielding gaskets to ensure electrical continuity and shielding effectiveness. The effect of the length l and width w of the seam on the shielding effectiveness can be estimated by the following formula:

[0079]

[0080] Where: λ is the wavelength of the electromagnetic wave; w is the gap width; l is the gap length.

[0081] Minimize the values ​​of l and w as much as possible, and use conductive washers at key locations to reduce the impact of gaps on shielding effectiveness.

[0082] 2. Ground connection

[0083] The electromagnetic shielding module needs to be closely integrated with the grounding management module to ensure that the shielding cover has a good grounding connection. The grounding of the shielding cover should be as short and direct as possible to avoid forming a ground loop. g The size of the resistance directly affects the shielding effect. The smaller the resistance, the better the grounding and the higher the shielding effectiveness. The grounding resistance can be calculated by the following formula:

[0084]

[0085] Where: ρ is the resistivity of the conductor; L is the length of the grounding wire; A is the cross-sectional area of ​​the grounding wire.

[0086] By selecting a larger cross-sectional area A and a shorter ground wire length L, as well as using low resistivity materials, the ground resistance can be optimized and the shielding effectiveness can be improved.

[0087] After the shielding cover is designed, the electromagnetic shielding module needs to be tested to verify its shielding effectiveness. Common testing methods include using a spectrum analyzer to measure the intensity of electromagnetic waves before and after shielding, and simulating the shielding effect through simulation software. The test results can be used to further adjust the design of the shielding cover, such as increasing the material thickness or improving the seam treatment, to ensure that the shielding effect meets the design requirements, thereby effectively preventing the influence of electromagnetic interference inside and outside the rack on the system.

[0088] The electromagnetic shielding module can provide reliable electromagnetic shielding in the entire rack system through reasonable material selection, precise structural design and effective grounding measures, ensuring coordinated work with other modules (such as power filter modules and signal transmission optimization modules) to ultimately achieve the system's electromagnetic compatibility goals.

[0089] Specifically, the grounding management module:

[0090] 1. Design of single-point grounding system

[0091] In order to ensure that all electrical connections in the system have the same potential, the grounding management module designs a single point grounding system (SPG, Single Point Grounding). In the single point grounding system, all modules and shielding layers are connected to a main grounding point through a dedicated grounding wire, avoiding the potential difference between multiple grounding points, thereby preventing the formation of ground loops, which is particularly critical in electromagnetic compatibility (EMC) design.

[0092] 2. Control of ground impedance

[0093] The key parameter of the grounding system is the grounding impedance Z g , its value should be as low as possible to ensure effective electromagnetic interference (EMI) suppression. g Including grounding resistance R g and ground inductance L g Two parts, the calculation formula is:

[0094] Z g =R g +jωL g

[0095] Where: R g is the grounding resistance, which is determined by the material resistivity and geometric dimensions of the grounding wire; ω is the angular frequency corresponding to the electromagnetic interference frequency; L g It is the grounding inductance, which is mainly determined by the length and layout of the grounding wire.

[0096] In order to reduce the grounding impedance, the material of the grounding wire is made of copper wire with high conductivity and low resistivity. The cross-sectional area A of the grounding wire affects the grounding resistance R. g .

[0097] By selecting a larger cross-sectional area A and a shorter grounding wire length L, the grounding resistance Rg can be effectively reduced, thereby reducing the grounding impedance Z g .

[0098] 3. Wiring design of grounding system

[0099] Effect of grounding wire wiring method on grounding inductance L g To reduce the grounding inductance, the grounding wires should be arranged in parallel and compact paths to avoid unnecessary windings and complex geometric structures. g The approximate calculation formula is:

[0100]

[0101] Where: μ0 is the magnetic permeability of vacuum; l is the length of the grounding wire; r is the radius of the grounding wire.

[0102] By optimizing the wiring path and making the ground wire as short and straight as possible, the inductance L can be reduced. g value, further reducing the ground impedance Z g , ensuring good grounding effect under high-frequency interference conditions.

[0103] 4. Integration of grounding management module with other modules

[0104] The grounding management module is directly connected to the electromagnetic shielding module, power filter module and signal transmission module to form a unified grounding network. Especially in combination with the electromagnetic shielding module, the grounding management module ensures that all shielding materials are at the same potential by directly connecting the shielding cover and shielding layer to the main grounding point, avoiding electromagnetic leakage and interference caused by potential difference.

[0105] For the power filter module, the grounding management module ensures that the grounding point of the filter is directly connected to the main grounding point to avoid the filter itself from reducing efficiency due to grounding problems. The signal line shielding layer in the signal transmission module should also be connected to the main grounding point through the grounding management module to ensure the electrical continuity and anti-interference ability of signal transmission.

[0106] After the grounding management module is designed, it is necessary to verify the effectiveness of the grounding system through field testing. The main test contents include grounding impedance measurement, ground potential difference test and electromagnetic compatibility test of the whole system. The grounding impedance and interference level of each frequency band are measured by spectrum analyzer to ensure that the system can maintain low grounding impedance and achieve good electromagnetic compatibility under all expected working conditions. These test results will be used to further optimize the design of the grounding management module, ensure that the grounding system of the system remains stable when integrated with other modules, reliably suppress electromagnetic interference, and finally achieve the unified grounding goal of the system.

[0107] Specifically, the signal transmission optimization module:

[0108] 1. Differential signal transmission technology

[0109] In order to ensure the stability and anti-interference ability of signal transmission, the signal transmission optimization module first adopts differential signal transmission technology. Differential signal transmission transmits signals of opposite phases through two parallel wires. This design can significantly reduce the electromagnetic radiation of the signal line and enhance the ability to resist electromagnetic interference.

[0110] In differential signal transmission, the signal voltage V diff is the voltage difference between the two conductors, and its formula is:

[0111] V diff =V + -V -

[0112] Where: V +and V _ They are the signal voltages transmitted on the two wires respectively.

[0113] Since external electromagnetic interference is usually coupled to the two wires in a common mode, this interference signal will appear as the same voltage V on the two wires. cm The differential receiver is only sensitive to the differential signal and is not sensitive to the common-mode signal V cm The rejection ratio can be expressed by the common mode rejection ratio (CMRR). The higher the CMRR, the stronger the anti-interference ability. The formula is:

[0114]

[0115] By selecting a differential receiver with high CMRR, the system's immunity to electromagnetic interference can be effectively improved.

[0116] 2. Use of shielded twisted pair and coaxial cable

[0117] The signal transmission optimization module also reduces the radiation and anti-interference ability of the signal line by using shielded twisted pair and coaxial cable. The shielded twisted pair further offsets electromagnetic radiation through the structure of two wires twisted together, and its external shielding layer can effectively isolate external electromagnetic interference. For coaxial cable, the shielding effect is stronger, and its internal coaxial structure can achieve higher anti-interference.

[0118] For shielded twisted pair cables, the main parameters include the twist pitch p and the shielding layer effectiveness SE. The calculation formula of the shielding effectiveness SE is similar to the shielding effectiveness in the electromagnetic shielding module and can be expressed as:

[0119]

[0120] Where: T is the transmission coefficient of the shielding layer.

[0121] By optimizing the twisting pitch p and shielding layer material of the shielded twisted pair cable, the shielding effectiveness SE can be effectively improved and the leakage of electromagnetic radiation can be reduced.

[0122] 3. Installation of small EMI filters

[0123] At the interface where the signal line enters the rack, the signal transmission optimization module is designed and installed with small EMI filters. These filters are mainly used to filter out high-frequency electromagnetic interference coupled through the signal line to ensure the purity of the transmitted signal.

[0124] EMI filters usually adopt a low-pass filter structure, and its transfer function H(s) can be expressed as:

[0125]

[0126] Where: R and C are the resistance and capacitance values ​​of the filter respectively.

[0127] The filter cutoff frequency ω c It can be calculated by the following formula:

[0128]

[0129] By selecting appropriate values ​​of resistance R and capacitance C, the cutoff frequency of the filter can be set so that only low-frequency signals are allowed to pass through, thereby filtering out high-frequency interference signals and ensuring the stability and integrity of signal transmission.

[0130] 4. Integration with other modules

[0131] The signal transmission optimization module works closely with the electromagnetic shielding module. All signal lines use shielded cables and are isolated from the external environment by the shielding layer of the electromagnetic shielding module. This design can effectively reduce electromagnetic radiation and external interference during signal transmission.

[0132] At the same time, the signal transmission optimization module is connected to the grounding management module, and the shielding layers of all signal lines are connected to the main grounding point through the grounding management module to ensure the electrical isolation and potential consistency of signal transmission. This integrated design is particularly important in an environment where high-frequency communication equipment and systems coexist, and helps to achieve electromagnetic compatibility (EMC) of the overall system.

[0133] 5. Verification and testing of signal transmission optimization

[0134] After the signal transmission optimization module is designed, its effect needs to be verified through spectrum analysis and anti-interference capability testing. The test content includes the integrity of signal transmission, anti-interference capability, and electromagnetic compatibility with other modules. By analyzing the test results, the design of the signal transmission optimization module can be further optimized to ensure that the signal transmission channels inside and outside the system remain stable and efficient in complex electromagnetic environments.

[0135] Specifically, the electromagnetic interference suppression module:

[0136] 1. Application of transient voltage suppression diode (TVS diode)

[0137] At the input and output ends of key devices in the system (such as switching power supply modules), the electromagnetic interference suppression module first configures transient voltage suppression diodes (TVS diodes). TVS diodes can clamp overvoltage pulses within nanoseconds to prevent high-frequency interference pulses from being transmitted to other parts of the system. The working principle of TVS diodes can be expressed by the following formula:

[0138] V clamp =V BR +I·R D

[0139] Where: V clamp is the clamping voltage of the TVS diode; V BR is the breakdown voltage of the TVS diode; I is the current through the TVS diode; R D is the dynamic resistance of the TVS diode.

[0140] When the transient high-frequency interference voltage V transient Exceeds the breakdown voltage V of the TVS diode BR When the TVS diode turns on quickly, the voltage is clamped at V clamp , thereby effectively suppressing the propagation of transient high-frequency interference.

[0141] 2. Application of Metal Oxide Varistor (MOV)

[0142] Metal oxide varistor (MOV) is also a key component in the electromagnetic interference suppression module, mainly used to absorb high-energy transient pulses. MOV is in a high-resistance state under normal operating voltage, and when the voltage exceeds the threshold, its impedance drops sharply, thereby absorbing interference energy. The voltage and current characteristics of MOV can be expressed as:

[0143] I=C·V α

[0144] Where: I is the current through the MOV; V is the voltage across the MOV; C and α are the material characteristic constants of the MOV.

[0145] When the transient voltage V transient When the threshold voltage of the MOV is exceeded, the MOV turns on quickly and absorbs the energy of the interference pulse through its nonlinear characteristics, thereby protecting other devices in the system.

[0146] 3. Configuration of EMI absorbing materials

[0147] Near the interference source in the system (such as switching power supplies and high-power devices), the electromagnetic interference suppression module is equipped with EMI absorption materials such as ferrite rings. Ferrite rings can effectively absorb high-frequency interference noise and reduce the spread of electromagnetic radiation through their high magnetic permeability. The relationship between the impedance of ferrite rings and frequency is:

[0148] Z(f)=R+jωL

[0149] Where: Z(f) is the impedance of the ferrite ring; R is the resistance component; L is the inductance component; ω is the angular frequency of the interference signal.

[0150] By selecting appropriate ferrite materials, the magnetic ring can exhibit high impedance within the target frequency band, thereby effectively absorbing and suppressing high-frequency interference noise.

[0151] 4. Integration with other modules

[0152] The electromagnetic interference suppression module works in conjunction with the power filter module to ensure that high-frequency interference is initially suppressed at the power input stage. The common-mode choke and capacitor array in the power filter module further filter out residual high-frequency interference signals.

[0153] In addition, the electromagnetic interference suppression module works together with the grounding management module to directly connect the absorption path of the TVS diode and MOV to the main grounding point, ensuring that transient interference energy is quickly introduced into the grounding system and preventing interference from being transmitted to other parts of the system through power lines or signal lines.

[0154] 5. Verification of electromagnetic interference suppression effect

[0155] After the electromagnetic interference suppression module is designed and implemented, the suppression effect needs to be verified through time domain and frequency domain testing methods. The main test methods include transient pulse injection test, spectrum analysis, and measurement of electromagnetic radiation inside the system. By comparing the system interference level before and after the suppression module is enabled, the effectiveness of the electromagnetic interference suppression module can be verified, and its design can be further optimized to achieve the best electromagnetic compatibility (EMC).

[0156] Specifically, the environmental monitoring and feedback module:

[0157] 1. Configuration of electromagnetic field sensor and noise detector

[0158] The environmental monitoring and feedback module collects electromagnetic environment data inside and outside the rack in real time by configuring electromagnetic field sensors and noise detectors. Electromagnetic field sensors are used to monitor the strength of electric and magnetic fields. Their working principle is based on Ampere's law and Faraday's law of electromagnetic induction:

[0159]

[0160]

[0161] in: is the electric field strength; is the magnetic field strength; is the electric potential; is the magnetic vector potential.

[0162] The noise detector is used to monitor the electromagnetic noise in the system. Its measurement data reflects the interference signal strength of each frequency band. The output signal of the noise detector is converted into frequency domain representation through Fourier transform:

[0163]

[0164] Where: X(f) is the frequency domain signal; x(t) is the time domain signal.

[0165] By performing frequency domain analysis on the collected electromagnetic environment data, the environmental monitoring and feedback module can identify the frequency range of the interference source and its intensity distribution.

[0166] 2. Data analysis and decision-making of embedded control systems

[0167] The embedded control system in the environmental monitoring and feedback module is responsible for processing the data from sensors and detectors, and dynamically adjusting the system's EMC protection strategy based on the analysis results. First, the control system pre-processes the collected data, filters out noise, and performs power spectrum density analysis to determine the main frequency band and amplitude of electromagnetic interference. Power spectrum density S x The calculation formula of (f) is:

[0168]

[0169] After determining the interference frequency band, the embedded control system adjusts the parameters of other modules through a closed-loop control algorithm. For example, the control system can dynamically adjust the cutoff frequency ω of the filter in the power filter module according to the changes in environmental noise. c , or adjust the conductive state of the shielding layer of the electromagnetic shielding module to enhance the shielding effectiveness.

[0170] 3. Dynamically adjust the filter cutoff frequency

[0171] After the environmental monitoring and feedback module finds that there is strong electromagnetic interference in a specific frequency band, the embedded control system can adjust the cutoff frequency of the filter ω c To enhance the filtering effect.

[0172] The embedded control system can achieve precise control of the filter cutoff frequency by adjusting the variable capacitor or variable inductor, thereby filtering out electromagnetic interference in a specific frequency band.

[0173] 4. Adjust the shielding effectiveness of the shielding layer

[0174] The environmental monitoring and feedback module can dynamically adjust the shielding effectiveness SE of the electromagnetic shielding module through the control system to adapt to changes in the external electromagnetic environment. The embedded control system can dynamically adjust the shielding effectiveness by adjusting the thickness t of the shielding layer or changing the conductivity according to actual needs.

[0175] 5. Logical association and feedback loop between modules

[0176] The environmental monitoring and feedback module works closely with other modules through an embedded control system to form a complete closed-loop control system. The monitoring data of the electromagnetic field sensor and the noise detector are feedback signals to guide the control system to adjust the operating status of each module.

[0177] For example, when an electromagnetic interference signal is detected to be enhanced, the control system will instruct the electromagnetic interference suppression module to increase the response speed of the TVS diode and MOV, adjust the shielding effectiveness of the electromagnetic shielding module, and optimize the transmission path of the signal transmission module. This closed-loop control mechanism ensures that the electromagnetic compatibility (EMC) performance of the entire system is always in the best state, regardless of how the external environment changes.

[0178] 6. Verification and optimization of environmental monitoring and feedback modules

[0179] The environmental monitoring and feedback module continuously collects data and makes feedback adjustments during system operation, and its effect is verified through multiple experiments, including electromagnetic compatibility testing and dynamic response time evaluation. Through these tests, it is verified whether the module can effectively optimize the overall EMC performance of the system under various working conditions, and further improve its algorithm and control strategy.

[0180] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A command vehicle rack-mounted power management system, characterized in that: include: Power filter module: Filters the power input to remove high-frequency electromagnetic interference that may be carried on the power line, thereby effectively suppressing high-frequency noise; Electromagnetic shielding module: Shields electromagnetic radiation inside and outside the system to prevent electromagnetic waves generated by equipment in the rack from affecting other equipment, and also prevents external interference from entering the system; Grounding management module: used to provide a unified grounding point for the system, ensuring that all electrical connections have the same potential, thereby reducing electromagnetic interference caused by differences in grounding points; Signal transmission optimization module: used to ensure that the signal transmission channels inside and outside the system are not affected by electromagnetic interference; Electromagnetic interference suppression module: used to suppress transient high-frequency interference generated in the system; Environmental monitoring and feedback module: used to monitor the electromagnetic environment inside and outside the rack in real time, and automatically adjust the system's EMC protection strategy based on the monitoring data to adapt to different working conditions.

2. A command vehicle rack-mounted power management system according to claim 1, characterized in that: The power supply filter module comprises: A common mode filter and a differential mode filter, wherein the common mode filter comprises a common mode choke for suppressing common mode interference; and the differential mode filter comprises a capacitor array and an inductor for suppressing differential mode interference.

3. A command vehicle rack-mounted power management system according to claim 2, characterized in that: The electromagnetic shielding module comprises: Shielding cover: The shielding cover surrounds the equipment in the rack to prevent electromagnetic leakage. Conductive gaskets are used to seal the seams of the shielding cover to ensure electrical continuity and shielding effectiveness.

4. A command vehicle rack-mounted power management system according to claim 3, characterized in that: The grounding management module includes: All modules are connected to one main grounding point via a dedicated grounding wire to avoid potential differences between multiple grounding points, thus preventing the formation of ground loops.

5. A command vehicle rack-mounted power management system according to claim 4, characterized in that: The signal transmission optimization module comprises: First, differential signal transmission is adopted to transmit signals with opposite phases through two parallel wires. At the same time, the radiation and anti-interference capabilities of the signal line are reduced by using shielded twisted pair and coaxial cable.

6. A command vehicle rack-mounted power management system according to claim 5, characterized in that: The electromagnetic interference suppression module comprises: Transient voltage suppression diodes are used to clamp overvoltage pulses to prevent high-frequency interference pulses from being transmitted to other parts of the system. When the transient high-frequency interference voltage generated in the system exceeds the breakdown voltage of the transient voltage suppression diode, the transient voltage suppression diode conducts and clamps the voltage at , thereby effectively suppressing the propagation of transient high-frequency interference. Metal oxide varistors are used to absorb high-energy transient pulses; MOVs are in a high-resistance state under normal operating voltage, but when the voltage exceeds the threshold, their impedance drops sharply, thereby absorbing interference energy; EMI absorbing materials are placed near the interference source within the system. They absorb high-frequency interference noise through their high magnetic permeability and reduce the spread of electromagnetic radiation.

7. A command vehicle rack-mounted power management system according to claim 6, characterized in that: The environmental monitoring and feedback module includes: Electromagnetic field sensors, noise detectors and embedded control systems. Electromagnetic field sensors are used to monitor the strength of electric and magnetic fields. Noise detectors are used to monitor electromagnetic noise in the system. Their measurement data is used to reflect the strength of interference signals in each frequency band. By performing frequency domain analysis on the collected electromagnetic environment data, the environmental monitoring and feedback module can identify the frequency range of interference sources and their intensity distribution. The embedded control system is used to process the data from sensors and detectors, and dynamically adjust the system's EMC protection strategy based on the analysis results. First, the collected data is preprocessed to filter out noise, and a power spectrum density analysis is performed to determine the main frequency band and amplitude of the electromagnetic interference. After determining the interference frequency band, the parameters of other modules are adjusted through a closed-loop control algorithm.

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