A new energy vehicle 800V platform high-voltage active filter

Abstract

This invention discloses a high-voltage active filter for an 800V platform in new energy vehicles, relating to the field of filter technology. It includes a mounting base plate, with a graded vibration damping and noise reduction assembly installed on the top of the mounting base plate. To prevent increased system-level electromagnetic coupling, this high-voltage active filter for an 800V platform in new energy vehicles utilizes four sets of first springs to dampen the housing when vibrations occur during vehicle operation. Multiple second springs, in conjunction with vibration damping, further attenuate the vibration acceleration. Elastic pads provide vibration damping for the mounting bases of the main controller, detection equipment, and compensation equipment. This achieves graded vibration damping and noise reduction for the filter's outer housing, internal partitions, and core detection equipment. The graded vibration damping, through progressive vibration suppression, not only blocks the critical path of electromagnetic coupling at its source but also enhances the anti-interference capability of low-voltage sensitive components.

Description

Technical Field

[0001] This invention relates to the field of filter technology, specifically to a high-voltage active filter for an 800V platform in new energy vehicles. Background Technology

[0002] The high-voltage active filter for the 800V high-voltage platform of new energy vehicles is a power electronic device that achieves precise filtering through dynamic detection and real-time compensation to address issues such as electromagnetic interference, grid harmonic pollution, and DC bus pulsation caused by high-frequency power devices under the 800V high-voltage architecture. Its core value lies in resolving the core contradiction between high power density and low electromagnetic interference, and high charging efficiency and low grid impact on the 800V platform. It is a core component for the stable operation of critical systems such as high-voltage fast charging and electric drive controllers.

[0003] Existing high-voltage active filters for new energy vehicles exhibit electromagnetic interference that, unlike 400V filters, are characterized by high voltage and high switching frequency. This amplifies the intensity of interference sources and the sensitivity of coupling paths, leading to uncontrolled electromagnetic interference between high-voltage components, the low-voltage system, and internal modules of the filter. The specific reasons are as follows: 1. Under an 800V bus voltage, the voltage spike when the SiC switch is turned off can reach 1.5 times the bus voltage, accompanied by high-frequency ringing, becoming a strong source of radiated interference. 2. The high-voltage busbar and the low-voltage control harness are close together, forming a parasitic capacitance. High-frequency noise enters the low-voltage system through capacitive coupling. Third, the low-voltage control unit and high-voltage APF of the 800V platform are highly integrated, and the sensors are mostly high-precision low-voltage devices with lower tolerance to high-frequency noise. This leads to increased system-level electromagnetic coupling in the high-voltage active filter of the 800V platform of new energy vehicles, which can easily cause the filter to fail and thus lead to an escalation of the safety risks of the whole vehicle.

[0004] Therefore, we propose a high-voltage active filter for the 800V platform of new energy vehicles to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a high-voltage active filter for 800V platforms in new energy vehicles, in order to solve the problem mentioned in the background art that the high-voltage active filter for 800V platforms in new energy vehicles is prone to increased system-level electromagnetic coupling during operation, which leads to an escalation of vehicle safety risks.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage active filter for a V-platform of a new energy vehicle, comprising a mounting base plate, wherein a graded vibration damping and noise reduction assembly is provided on the top of the mounting base plate, the graded vibration damping and noise reduction assembly comprising eight miniature electric actuators, eight first springs and elastic pads, each of the eight miniature electric actuators having a connecting rod at its top end, each pair of the eight connecting rods forming a group, and a lifting rod fixedly connected to one end of each group of connecting rods, wherein a housing is provided between the top ends of the eight connecting rods, and two partitions are slidably connected to the inner wall of the housing, each of the two partitions having a shielding layer on its opposite outer surface, and four vibration damping dampers at the bottom of each of the two partitions, each pair of the eight first springs forming a group, each group of miniature electric actuators adjusting its own length, thereby adjusting the extension stroke of each corresponding group of first springs, thereby adjusting the vibration resistance of the filter, the eight vibration damping dampers and elastic pads further attenuating the vibration intensity, and the four shielding layers blocking the propagation path of electromagnetic noise radiation.

[0007] Preferably, the graded vibration reduction and noise reduction assembly further includes a housing, and connecting blocks are fixedly installed on the top of the mounting base plate near the four corners. A lifting plate is provided between the top ends of each group of first springs, and mounting compartments are fixed on the top of the four connecting blocks near the two side edges.

[0008] Preferably, the inner walls of the eight installation chambers are slidably connected with elastic plates, the interiors of the four lifting rods are movably fitted with connecting buckles, the bottoms of the two partitions are provided with vibration damping pads, and the outer surfaces of the eight vibration damping devices are provided with second springs.

[0009] Preferably, a main controller is provided at the top of the elastic pad near the center, a detection device is provided at the top of the elastic pad near one side edge, and a compensation device is provided at the top of the elastic pad near the other side edge.

[0010] Preferably, the bottom end of each group of first springs is fixedly connected to the top of four connecting blocks, the top end of each group of first springs is fixedly connected to the bottom of four lifting plates, and the top end of each of the eight miniature electric actuators is fixedly connected to the bottom of eight elastic plates.

[0011] Preferably, the tops of the eight miniature electric actuators are fixedly connected to the bottoms of the eight connecting rods, the tops of the eight connecting rods extend movably through the outside of the eight mounting chambers, and the bottoms of the four connecting buckles are fixedly connected to the tops of the four lifting plates.

[0012] Preferably, the tops of the four connecting buckles are fixedly connected to the bottom of the housing, and the eight vibration damping dampers are grouped into four adjacent groups. One end of each group of vibration damping dampers is coupled to the bottom of two vibration damping pads, and the other end of each group of vibration damping dampers is coupled to the inner wall of the housing.

[0013] Preferably, four adjacent springs in each of the eight second springs form a group, one end of each group of the second springs is coupled to the bottom of two damping pads, and the other end of each group of the second springs is coupled to the inner wall of the housing. The main controller, detection device and compensation device are all set inside the housing through elastic pads.

[0014] Preferably, it also includes a high-voltage active filter system for a V-platform of a new energy vehicle, which includes: a central control unit, an auxiliary unit, a detection unit, and a compensation unit. The detection unit includes a high-frequency current detection module, an EMI spectrum analyzer module, and a vibration detection module. The compensation unit includes a shielding cooperation module, a filtering cooperation module, an isolation cooperation module, and a structural cooperation module.

[0015] Preferably, the central control unit is used to perform real-time calculations on the signals collected by the detection unit; the auxiliary unit is responsible for the power supply, monitoring, heat dissipation, protection, communication and status management of the filter; the detection unit collects the voltage signal of the high-voltage bus in real time through the cooperation between the high-frequency current detection module, the EMI spectrum analyzer module and the vibration detection module, and extracts harmonic, ripple and interference characteristics; the compensation unit is used to receive instructions from the central control unit and control the bus ripple rate and total harmonic distortion rate within the automotive-grade requirements through the cooperation between the shielding cooperation module, the filtering cooperation module, the isolation cooperation module and the structural cooperation module.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. To prevent the aggravation of system-level electromagnetic coupling, when the vehicle vibrates during operation, four sets of first springs dampen the housing. The cooperation between multiple second springs and damping dampers further attenuates the vibration acceleration. Elastic pads provide a certain degree of vibration damping for the mounting bases of the main controller, detection equipment, and compensation equipment. This achieves graded vibration reduction and noise reduction for the filter's outer housing, internal partitions, and core detection equipment. Graded vibration reduction, through progressive vibration suppression, not only blocks the critical path of electromagnetic coupling at the source but also strengthens the anti-interference capability of low-voltage sensitive components. This solves the problem in existing technologies where high-voltage active filters on V-platforms of new energy vehicles are prone to aggravated system-level electromagnetic coupling during operation, leading to an escalation of vehicle safety risks.

[0017] 2. When it is necessary to adjust the vibration intensity of the housing, activate the eight miniature electric actuators to extend or shorten them, thereby moving the corresponding elastic plates up and down or downward. This increases or decreases the vertical distance between the corresponding connecting rod and the elastic plate, changing the compression of the first spring and thus changing the natural frequency of the first spring. By adjusting the compression length of the first spring, the vibration damping of the filter can take into account the vibration damping requirements of different driving conditions, avoiding the increase in energy consumption caused by excessive vibration damping.

[0018] 3. The central control unit receives various data transmitted from the detection unit, ensuring the overall filter operates stably according to the preset program. The auxiliary unit provides low-voltage DC power to the high-precision modules in the central control unit and detection unit, preventing high-voltage fluctuations from affecting the operation of these sensitive units. The EMI spectrum analyzer module analyzes the interference spectrum and identifies common-mode noise and differential-mode noise in the dominant frequency band. The vibration detection module can determine whether the coupling caused by component heating will lead to changes in parasitic parameters. The compensation unit adjusts the grounding impedance through the shielding cooperation module to ensure that the shielding effectiveness is greater than 40dB. The filtering cooperation module can switch the combination of common-mode coil and differential-mode capacitor. The isolation cooperation module enables the power supply circuit of the detection unit and the central control unit to prevent high-voltage interference from entering the low-voltage system. Through the coordinated execution of multiple modules, the problem of vibration exacerbating coupling is solved, and shielding failure caused by vibration is prevented. Attached Figure Description

[0019] Figure 1 This is a front-view perspective view of a high-voltage active filter for an 800V platform in a new energy vehicle according to the present invention. Figure 2 This is a three-dimensional view of a graded vibration reduction and noise reduction component of a high-voltage active filter for an 800V platform in a new energy vehicle according to the present invention. Figure 3 This is a sectional perspective view of the mounting compartment of a high-voltage active filter for an 800V platform in a new energy vehicle according to the present invention. Figure 4 This is a perspective view of the housing portion of a high-voltage active filter for an 800V platform in a new energy vehicle according to the present invention. Figure 5 This is a perspective view of the main controller portion of a high-voltage active filter for an 800V platform in a new energy vehicle according to the present invention. Figure 6 This is a perspective view of the partition portion of a high-voltage active filter for an 800V platform in a new energy vehicle according to the present invention. Figure 7 This is a perspective view of the shielding layer portion of a high-voltage active filter for an 800V platform in a new energy vehicle according to the present invention. Figure 8 This is a system diagram of a high-voltage active filter for an 800V platform in a new energy vehicle according to the present invention.

[0020] In the picture: 1. Mounting base plate; 2. Graded vibration damping and noise reduction components; 201. Housing; 202. Connecting block; 203. First spring; 204. Lifting plate; 205. Mounting chamber; 206. Miniature electric actuator; 207. Elastic plate; 208. Connecting rod; 209. Lifting rod; 210. Connecting buckle; 211. Elastic pad; 212. Partition plate; 213. Shielding layer; 214. Vibration damping pad; 215. Vibration damping; 216. Second spring; 217. Main controller; 218. Detection equipment; 219. Compensation equipment; 3. Central control unit; 4. Auxiliary unit; 5. Detection unit; 501. High-frequency current detection module; 502. EMI spectrum analyzer module; 503. Vibration detection module; 6. Compensation unit; 601. Shielding cooperation module; 602. Filtering cooperation module; 603. Isolation cooperation module; 604. Structural cooperation module. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-7This invention provides a technical solution: a high-voltage active filter for an 800V platform in new energy vehicles, comprising a mounting base plate 1, a graded vibration damping and noise reduction assembly 2 disposed on the top of the mounting base plate 1, the graded vibration damping and noise reduction assembly 2 comprising eight miniature electric actuators 206, eight first springs 203 and elastic pads 211, each of the eight miniature electric actuators 206 having a connecting rod 208 at its top, each pair of adjacent connecting rods 208 forming a group, and a lifting rod 209 fixedly connected to one end of each group of connecting rods 208, a housing 201 disposed between the top ends of the eight connecting rods 208, two partitions 212 slidably connected to the inner wall of the housing 201, shielding layers 213 disposed on the opposite outer surfaces of the two partitions 212, and four vibration damping pads disposed at the bottom of each of the two partitions 212. Damping 215, each pair of eight first springs 203 is grouped together. Each group of miniature electric actuators 206 adjusts its own length, thereby adjusting the extension stroke of each corresponding group of first springs 203, thus adjusting the vibration resistance of the filter. The eight vibration damping dampers 215 and elastic pads 211 further attenuate the vibration intensity. Four shielding layers 213 block the propagation path of electromagnetic noise radiation. The graded vibration reduction and noise reduction component 2 also includes a housing 201. Connecting blocks 202 are fixedly installed on the top of the mounting base plate 1 near the four corners. Lifting plates 204 are set between the tops of each group of first springs 203. Mounting chambers 205 are fixed on the tops of the four connecting blocks 202 near the two side edges. The inner walls of the eight mounting chambers 205 are slidably connected with elastic pads. The plate 207 and the four lifting rods 209 are each movably fitted with connecting buckles 210. The bottoms of the two partitions 212 are each equipped with damping pads 214. The outer surfaces of the eight damping dampers 215 are each equipped with second springs 216. A main controller 217 is located near the center of the top of the elastic pad 211. A detection device 218 is located near one edge of the top of the elastic pad 211, and a compensation device 219 is located near the other edge of the top of the elastic pad 211. The bottom of each set of first springs 203 is fixedly connected to the top of the four connecting blocks 202, and the top of each set of first springs 203 is fixedly connected to the bottom of the four lifting plates 204. The tops of the eight miniature electric actuators 206 are fixedly connected to the bottom of the eight elastic plates 207. The tops of eight miniature electric actuators 206 are fixedly connected to the bottoms of eight connecting rods 208, and the tops of the eight connecting rods 208 extend movably through the exterior of eight mounting chambers 205. The bottoms of four connecting buckles 210 are fixedly connected to the tops of four lifting plates 204, and the tops of the four connecting buckles 210 are fixedly connected to the bottom of the housing 201. Four adjacent damping dampers 215 form a group, one end of each group of damping dampers 215 is coupled to the bottom of two damping pads 214, and the other end of each group of damping dampers 215 is coupled to the inner wall of the housing 201. Four adjacent second springs 216 form a group, one end of each group of second springs 216 is coupled to the bottom of two damping pads 214.The other end of each set of second springs 216 is coupled to the inner wall of the housing 201. The main controller 217, detection device 218, and compensation device 219 are all disposed inside the housing 201 via elastic pads.

[0023] In this embodiment, during the operation of a new energy vehicle, the filter, as a device to ensure the stability of the vehicle's electrical system, mainly consists of a main controller 217, a detection device 218, and a compensation device 219. The main controller 217 is the core computing and control unit of the entire filter, capable of receiving data such as high-voltage bus current, voltage, EMI spectrum, and vibration uploaded by the detection device 218. Through built-in algorithms, it accurately identifies the amplitude, phase, and frequency characteristics of high-frequency harmonics, voltage spikes, and common-mode interference unique to the 800V platform, determining the severity of electromagnetic coupling. The detection device 218, composed of various sensors and a signal conditioning module, can accurately collect system operating data in real time, providing a reliable basis for decision-making. The compensation device 219 is the core of the entire filter. The actuator's core function is to receive commands from the main controller 217 and output a reverse compensation signal to cancel out harmonics and interference from the high-voltage bus. Because the high-voltage bus and low-voltage control harness in the 800V platform are close together, parasitic capacitance is easily formed. The magnitude of this parasitic capacitance changes due to positional shifts caused by component vibration, thus exacerbating capacitive coupling of high-frequency noise. To prevent increased system-level electromagnetic coupling, when the vehicle vibrates during operation, four sets of first springs 203 dampen the housing 201, ensuring the stability of the filter's mechanical structure and preventing sudden changes in parasitic parameters and signal transmission distortion caused by vibration. This fundamentally prevents vibration from causing structural loosening and worsening electromagnetic coupling. Furthermore, each first spring... Each component 203 contains dampers. Multiple second springs 216 dampen the vibration of the partition 212, further protecting the mechanical structure within the filter. The damping 215 dissipates the mechanical energy of the vibration, converting it into heat or other forms of energy, thus reducing the amplitude and propagation efficiency of the vibration and ultimately protecting the equipment from vibration. This is a mature technology and will not be discussed in detail here. When external vibrations occur, the partition 212 will vibrate. The cooperation between the multiple second springs 216 and the damping 215 further attenuates the vibration acceleration. The partition 212 prevents electrical interference between the main controller 217, the detection device 218, and the compensation device 219. The electromagnetic interference shielding consists of a partition 212 made of tin-plated copper wire and aluminum foil, which can quickly block the radiation propagation of high-frequency signals. The shielding mesh woven from tin-plated copper wire is good at suppressing low-frequency electromagnetic interference. The combination of the two can achieve full-band electromagnetic shielding, ensuring the stability of the wire harness transmission. The tin plating layer can also improve the corrosion resistance of the copper wire. The shielding layer 213 is made of electromagnetic absorbing material. The absorbing material can convert the energy of high-frequency electromagnetic noise into heat energy and slowly dissipate it through its own hysteresis loss and dielectric loss. It can directly intercept noise propagation and reduce interference to the signal transmission path inside the filter. Finally, the elastic pad 211 plays a certain role in vibration reduction for the mounting base of the main controller 217, detection equipment 218 and compensation equipment 219.The elastic gasket 211 is made of rubber with a certain degree of elasticity. Through the use of the graded vibration damping and noise reduction component 2, graded vibration damping and noise reduction are achieved for the filter's outer housing 201, internal partition 212, and core testing equipment 218. The vibration damping structure of the housing 201 absorbs vibration energy and reduces the vibration amplitude of the housing 201. Because the vibration amplitude is reduced, the electromagnetic radiation intensity of the housing 201 is reduced, thereby weakening the influence of this strong radiation interference source. This ensures the complete shielding of the housing 201, preventing electromagnetic interference from leaking out through gaps. It also blocks the impact of external environmental vibrations on the internal components of the filter. Through the vibration damping treatment of the partition 212, vibration coupling between modules is blocked, and the capacitive coupling path is cut off. This not only reduces the capacitance of high-frequency noise... Coupling can also reduce the efficiency of high-frequency noise entering the low-voltage system through capacitive coupling. By reducing vibration of devices such as the main controller 217, detection equipment 218, and compensation equipment 219, sensitive components are protected, anti-interference tolerance is improved, the amplitude of high-frequency ringing is suppressed, and the fluctuation amplitude of voltage spikes is reduced. This reduces the intensity of the interference source at its source. Graded vibration reduction, through progressive vibration suppression, not only blocks the critical path of electromagnetic coupling at its source but also strengthens the anti-interference capability of low-voltage sensitive components, thereby comprehensively alleviating the problem of increased system-level electromagnetic coupling, ensuring the stable performance of the filter, and solving the problem of increased system-level electromagnetic coupling during operation of high-voltage active filters on 800V platforms for new energy vehicles, which leads to escalated vehicle safety risks.

[0024] like Figures 1-7As shown, a high-voltage active filter for an 800V platform in a new energy vehicle includes a mounting base plate 1. A graded vibration damping and noise reduction assembly 2 is installed on the top of the mounting base plate 1. The graded vibration damping and noise reduction assembly 2 includes eight miniature electric actuators 206, eight first springs 203, and elastic pads 211. Each of the eight miniature electric actuators 206 has a connecting rod 208 at its top. Each pair of adjacent connecting rods 208 forms a group. A lifting rod 209 is fixedly connected to one end of each group of connecting rods 208. A housing 201 is installed between the tops of the eight connecting rods 208. Two partitions 212 are slidably connected to the inner wall of the housing 201. Shielding layers 213 are installed on the opposite outer surfaces of the two partitions 212. Four vibration damping dampers 215 are installed at the bottom of each of the two partitions 212. Each pair of adjacent first springs 203 forms a group. Each group of miniature electric actuators 206 adjusts its length... The degree of vibration damping and noise reduction is adjusted, thereby adjusting the extension stroke of each group of first springs 203, thereby adjusting the vibration damping strength of the filter. Eight damping dampers 215 and elastic pads 211 further attenuate the vibration intensity. Four shielding layers 213 block the propagation path of electromagnetic noise radiation. The graded vibration damping and noise reduction component 2 also includes a housing 201. Connecting blocks 202 are fixedly installed on the top of the mounting base plate 1 near the four corners. Lifting plates 204 are set between the tops of each group of first springs 203. Mounting chambers 205 are fixed on the tops of the four connecting blocks 202 near the two side edges. Elastic plates 207 are slidably connected to the inner walls of the eight mounting chambers 205. Connecting buckles 210 are movably embedded inside the four lifting rods 209. Vibration damping pads 214 are set at the bottom of the two partitions 212. Second springs 216 are set on the outer surfaces of the eight damping dampers 215.

[0025] In this embodiment, to achieve graded vibration reduction of the housing 201, when it is necessary to adjust the vibration intensity of the housing 201, eight miniature electric actuators 206 can be activated by an external control system to extend or shorten them, thereby driving the corresponding elastic plates 207 to move up or down or downward. This increases or decreases the vertical distance between the corresponding connecting rods 208 and the elastic plates 207. When the housing 201 presses against the four connecting buckles 210, it pushes each corresponding set of connecting rods 208 downward, thereby pressing the corresponding first spring 203. At the same time, as the four connecting buckles 210 move downward, they also drive each corresponding set of connecting rods 208 downward until the bottom end of the connecting rod 208 contacts the top of the corresponding elastic plate 207. By changing the connection... The vertical distance between rod 208 and elastic plate 207 changes the stiffness and damping characteristics of the first spring 203 by altering its compression, thereby adjusting the vibration resistance. Within the elastic limit, the longer the spring compression length, the greater the compression and the higher the stiffness. When the first spring 203 compression length is short, the stiffness is low, which can flexibly buffer small-amplitude high-frequency vibrations and prevent vibration from being transmitted to the internal module. When the first spring 203 compression length is long, the stiffness is high, which can rigidly offset large-amplitude low-frequency vibrations and prevent the housing 201 from deforming. By changing the compression length of the first spring 203, the natural frequency of the first spring 203 is changed. By adjusting the compression length of the first spring 203, the vibration resistance of the filter can take into account the vibration resistance requirements of different driving conditions and avoid increased energy consumption caused by excessive vibration reduction.

[0026] like Figure 8 As shown, it also includes a high-voltage active filter system for an 800V platform of new energy vehicles, which includes: a central control unit 3, an auxiliary unit 4, a detection unit 5, and a compensation unit 6. The detection unit 5 includes a high-frequency current detection module 501, an EMI spectrum analyzer module 502, and a vibration detection module 503. The compensation unit 6 includes a shielding cooperation module 601, a filtering cooperation module 602, an isolation cooperation module 603, and a structural cooperation module 604. The central control unit 3 is used to perform real-time calculations on the signals collected by the detection unit 5. The auxiliary unit 4 is responsible for the power supply, monitoring, heat dissipation, protection, communication, and status management of the filter. The detection unit 5 collects the voltage signal of the high-voltage bus in real time through the cooperation between the high-frequency current detection module 501, the EMI spectrum analyzer module 502, and the vibration detection module 503, and extracts harmonic, ripple, and interference characteristics. The compensation unit 6 is used to receive instructions from the central control unit 3 and control the bus ripple rate and total harmonic distortion rate within the automotive-grade requirements through the cooperation between the shielding cooperation module 601, the filtering cooperation module 602, the isolation cooperation module 603, and the structural cooperation module 604.

[0027] In this embodiment, to further ensure the stable operation of the filter, the central control unit 3 receives various data transmitted by the detection unit 5, and analyzes whether parameters such as high-frequency current, electromagnetic interference, and vibration exceed safety thresholds using a built-in algorithm. On the other hand, it issues precise control commands to the compensation unit 6 to adjust the amplitude and phase of the compensation current and control the working state of the shielding and vibration damping structures, thereby ensuring the overall stable operation of the filter according to the preset program. The auxiliary unit 4 provides low-voltage DC power to the high-precision modules in the central control unit 3 and the detection unit 5 to prevent high-voltage fluctuations from affecting the operation of these sensitive units. It also monitors the circuit status and promptly feeds back to the central control unit 3 when power supply abnormalities occur. The high-frequency current detection module 501 collects the common-mode current and differential-mode current of the APF bus in the filter and monitors the bus ripple voltage through an external voltage sensor. The EMI spectrum analyzer module 502 analyzes the interference spectrum to identify the common-mode noise and differential-mode noise in the dominant frequency band. If the temperature exceeds the limit, the vibration detection module 5... 03 can determine whether the coupling is caused by component heating leading to changes in parasitic parameters. If the vibration exceeds the standard, it can also be determined that the coupling is caused by loose wiring harness or cracked shielding joints. In addition, the compensation unit 6 adjusts the grounding impedance through the shielding cooperation module 601 to ensure that the shielding efficiency is greater than 40dB. It checks the grounding status of the shielding layer of high-voltage and low-voltage wiring harnesses to ensure all-round ring grounding. The filtering cooperation module 602 can switch the combination of common-mode current coil and differential-mode capacitor to attenuate the dominant interference frequency band. The isolation cooperation module 603 enables the power circuit of the detection unit 5 and the central control unit 3 to prevent high-voltage interference from entering the low-voltage system. If vibration causes coupling, the structural cooperation module 604 can adjust the inflation of the anti-vibration silicone pad to enhance the component fixing strength. Through the coordinated execution of multiple modules, the problem of vibration aggravating coupling is solved. Through the graded vibration reduction of the structural cooperation module 604, parasitic parameters are stabilized, and interference amplification caused by resonant frequency drift is avoided. At the same time, the reliability of shielding equipment and grounding terminals is ensured, and shielding failure caused by vibration is prevented.

[0028] The usage and working principle of this device: Because the high-voltage busbar and low-voltage control harness in an 800V platform are close together, parasitic capacitance is easily formed. The size of this parasitic capacitance changes due to positional shifts caused by component vibration, thus exacerbating capacitive coupling of high-frequency noise. To prevent increased system-level electromagnetic coupling, when the vehicle vibrates during operation, four sets of first springs 203 dampen the housing 201, ensuring the stability of the filter's mechanical structure and preventing sudden changes in parasitic parameters and signal transmission distortion caused by vibration. This fundamentally prevents vibration from causing structural loosening and worsening electromagnetic coupling. Multiple second springs 216 dampen the partition 212, further strengthening the mechanical structure within the filter. The partition 212 serves as a vibration damping and protection mechanism. When external vibrations occur, the partition 212 will vibrate to a certain extent. Through the cooperation of multiple second springs 216 and vibration damping 215, the vibration acceleration is attenuated again. The partition 212 can prevent electromagnetic interference between the main controller 217, detection equipment 218, and compensation equipment 219. The partition 212 is made of tin-plated copper wire and aluminum foil, which can quickly block the radiation propagation of high-frequency signals. The shielding mesh woven from tin-plated copper wire is good at suppressing low-frequency electromagnetic interference. The combination of the two can achieve full-band electromagnetic shielding, ensuring the stability of the wire harness transmission. The tin plating layer can also improve the corrosion resistance of the copper wire. The shielding layer 213 is made of electromagnetic absorbing material. The absorbing material can reduce electromagnetic interference through its own hysteresis loss and dielectric loss. Electrical losses convert the energy of high-frequency electromagnetic noise into heat energy and slowly dissipate it, directly intercepting noise propagation. Finally, through the action of the elastic pad 211, it plays a certain role in damping the mounting base of the main controller 217, detection equipment 218, and compensation equipment 219. The elastic pad 211 is made of rubber material with a certain degree of elasticity. By adopting the graded vibration damping and noise reduction component 2, graded vibration damping and noise reduction treatment is achieved for the filter's outer shell 201, internal partition 212, and core detection equipment 218. The vibration damping structure of the shell 201 can absorb vibration energy and reduce the vibration amplitude of the shell 201. Because the vibration amplitude is reduced, the electromagnetic radiation intensity of the shell 201 is reduced, thereby weakening the influence of this strong radiation interference source, thus ensuring... To ensure the complete shielding of the housing 201 and prevent electromagnetic interference from leaking out through gaps, while also blocking the impact of external environmental vibrations on the internal components of the filter, vibration coupling between modules is blocked and capacitive coupling paths are severed through vibration damping treatment of the partition plate 212. This not only reduces the capacitive coupling of high-frequency noise but also reduces the efficiency of high-frequency noise entering the low-voltage system through capacitive coupling. When it is necessary to adjust the vibration intensity of the housing 201, the eight miniature electric actuators 206 can be activated by the external control system to extend or shorten, thereby moving the corresponding elastic plates 207 up or down or down. This increases or decreases the vertical distance between the corresponding connecting rods 208 and the elastic plates 207. When the housing 201 presses against the four connecting buckles 210...Each corresponding link 208 is pushed downwards, thereby compressing the corresponding first spring 203. Simultaneously, as the four connecting buckles 210 move downwards, they also cause each corresponding link 208 to move downwards until the bottom end of the link 208 contacts the top of the corresponding elastic plate 207. By changing the vertical distance between the link 208 and the elastic plate 207, the compression of the first spring 203 is altered, changing its stiffness and damping characteristics, thus adjusting the vibration resistance. Within the elastic limit, the longer the spring compression length, the greater the compression and the higher the stiffness. When the first spring 203 has a short compression length, its stiffness is low, allowing for flexible buffering of small-amplitude high-frequency vibrations and preventing vibration transmission to the internal modules. A longer compression length results in higher rigidity, effectively offsetting large low-frequency vibrations and preventing deformation of the housing 201. By altering the compression length of the first spring 203, its natural frequency is changed. Adjusting the compression length of the first spring 203 allows for vibration damping treatment of the filter to meet the requirements of different driving conditions, avoiding increased energy consumption due to excessive vibration reduction. The central control unit 3 receives various data transmitted from the detection unit 5 and analyzes parameters such as high-frequency current, electromagnetic interference, and vibration using built-in algorithms to determine if they exceed safety thresholds. Simultaneously, it sends precise control commands to the compensation unit 6 to adjust the amplitude and phase of the compensation current and control the working state of the shielding and vibration damping structures, thereby ensuring the overall filter operates stably according to the preset program. The auxiliary unit 4 provides low-voltage DC power to the high-precision modules in the central control unit 3 and detection unit 5, preventing high-voltage fluctuations from affecting the operation of these sensitive units. It also monitors circuit status, promptly reporting any power supply anomalies to the central control unit 3. The high-frequency current detection module 501 collects the common-mode and differential-mode currents of the APF bus in the filter and monitors the bus ripple voltage using an external voltage sensor. The EMI spectrum analyzer module 502 analyzes the interference spectrum, identifying the common-mode and differential-mode noise in the dominant frequency band. If the temperature exceeds the limit, the vibration detection module 503 can determine whether the coupling is caused by component heating leading to changes in parasitic parameters. If the vibration exceeds the limit, it can also determine if the coupling is caused by loose wiring or cracked shielding joints. Additionally, the compensation unit... In step 6, the grounding impedance is adjusted via the shielding cooperation module 601 to ensure a shielding effectiveness greater than 40dB. The grounding status of the shielding layers of the high-voltage and low-voltage harnesses is checked to ensure omnidirectional ring grounding. The filtering cooperation module 602 can switch the combination of common-mode coils and differential-mode capacitors to specifically attenuate the dominant interference frequency band. The isolation cooperation module 603 enables the power circuit of the detection unit 5 and the central control unit 3 to prevent high-voltage interference from entering the low-voltage system. If vibration causes coupling, the structural cooperation module 604 can adjust the inflation of the anti-vibration silicone pad to enhance the component's fixing strength. The external control system is electrically connected to the miniature electric actuator 206, vibration damping 215, main controller 217, detection equipment 218, and compensation equipment 219.

[0029] The wiring diagrams of the miniature electric actuator 206, vibration damping 215, main controller 217, detection device 218, and compensation device 219 in this invention are common knowledge in the field, and their working principles are known technologies. The appropriate model is selected according to actual use. Therefore, the control methods and wiring layouts of the miniature electric actuator 206, vibration damping 215, main controller 217, detection device 218, and compensation device 219 will not be explained in detail.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-voltage active filter for an 800V platform of a new energy vehicle, comprising a mounting base plate (1), wherein a graded vibration damping and noise reduction assembly (2) is provided on the top of the mounting base plate (1), characterized in that: The graded vibration reduction and noise reduction component (2) includes eight miniature electric actuators (206), eight first springs (203), and elastic pads (211). Each of the eight miniature electric actuators (206) has a connecting rod (208) at its top end. Each pair of adjacent connecting rods (208) forms a group. A lifting rod (209) is fixedly connected between one end of each group of connecting rods (208). A housing (201) is provided between the top ends of the eight connecting rods (208). Two partitions (212) are slidably connected to the inner wall of the housing (201). Shielding layers (213) are provided on the opposite outer surfaces of the two partitions (212). Four vibration damping dampers (215) are provided at the bottom of the two partitions (212). Each pair of the eight first springs (203) forms a group, and each group of the micro electric actuators (206) adjusts its own length, thereby adjusting the extension stroke of each group of first springs (203) to adjust the vibration resistance of the filter. The eight vibration damping dampers (215) and elastic pads (211) further attenuate the vibration intensity, and the four shielding layers (213) block the propagation path of electromagnetic noise radiation.

2. The high-voltage active filter for 800V platform of new energy vehicles according to claim 1, characterized in that: The graded vibration reduction and noise reduction component (2) also includes a housing (201), and a connecting block (202) is fixedly installed on the top of the mounting base plate (1) near the four corners. A lifting plate (204) is provided between the tops of each group of the first springs (203), and an installation chamber (205) is fixed on the top of the four connecting blocks (202) near the two side edges.

3. The high-voltage active filter for 800V platforms in new energy vehicles according to claim 2, characterized in that: The inner walls of the eight installation chambers (205) are slidably connected with elastic plates (207), the four lifting rods (209) are movably embedded with connecting buckles (210), the bottom of the two partitions (212) are provided with damping pads (214), and the outer surfaces of the eight damping dampers (215) are provided with second springs (216).

4. The high-voltage active filter for 800V platform of new energy vehicles according to claim 3, characterized in that: A main controller (217) is provided at the top of the elastic pad (211) near the center, a detection device (218) is provided at the top of the elastic pad (211) near one side edge, and a compensation device (219) is provided at the top of the elastic pad (211) near the other side edge.

5. The high-voltage active filter for 800V platform of new energy vehicles according to claim 4, characterized in that: The bottom end of each group of first springs (203) is fixedly connected to the top of four connecting blocks (202), the top end of each group of first springs (203) is fixedly connected to the bottom of four lifting plates (204), and the top end of the eight miniature electric push rods (206) is fixedly connected to the bottom of eight elastic plates (207).

6. The high-voltage active filter for 800V platform of new energy vehicles according to claim 5, characterized in that: The tops of the eight miniature electric actuators (206) are fixedly connected to the bottoms of the eight connecting rods (208), the tops of the eight connecting rods (208) extend movably through the outside of the eight mounting chambers (205), and the bottoms of the four connecting buckles (210) are fixedly connected to the tops of the four lifting plates (204).

7. The high-voltage active filter for 800V platform of new energy vehicles according to claim 6, characterized in that: The tops of the four connecting buckles (210) are fixedly connected to the bottom of the housing (201). The eight vibration damping dampers (215) are grouped into four adjacent groups. One end of each group of vibration damping dampers (215) is coupled to the bottom of two vibration damping pads (214), and the other end of each group of vibration damping dampers (215) is coupled to the inner wall of the housing (201).

8. The high-voltage active filter for 800V platform of new energy vehicles according to claim 7, characterized in that: The eight second springs (216) are grouped into four adjacent groups. One end of each group of the second springs (216) is coupled to the bottom of two damping pads (214), and the other end of each group of the second springs (216) is coupled to the inner wall of the housing (201). The main controller (217), the detection device (218) and the compensation device (219) are all set inside the housing (201) through elastic pads.

9. The high-voltage active filter for 800V platform of new energy vehicles according to claim 8, characterized in that: It also includes a high-voltage active filter system for an 800V platform of new energy vehicles, which includes: a central control unit (3), an auxiliary unit (4), a detection unit (5) and a compensation unit (6). The detection unit (5) includes a high-frequency current detection module (501), an EMI spectrum analyzer module (502) and a vibration detection module (503). The compensation unit (6) includes a shielding cooperation module (601), a filtering cooperation module (602), an isolation cooperation module (603) and a structural cooperation module (604).

10. The high-voltage active filter for a new energy vehicle 800V platform according to claim 9, characterized in that: The central control unit (3) is used to perform real-time calculations on the signals collected by the detection unit (5); the auxiliary unit (4) is responsible for the power supply, monitoring, heat dissipation, protection, communication and status management of the filter; the detection unit (5) collects the voltage signal of the high-voltage bus in real time through the cooperation between the high-frequency current detection module (501), the EMI spectrum analyzer module (502) and the vibration detection module (503), and extracts the harmonic, ripple and interference characteristics; the compensation unit (6) is used to receive the instructions of the central control unit (3), and control the bus ripple rate and total harmonic distortion rate within the automotive grade requirements through the cooperation between the shielding cooperation module (601), the filtering cooperation module (602), the isolation cooperation module (603) and the structural cooperation module (604).

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