Power panel assembly based on output noise suppression and ripple attenuation

Abstract

The invention provides a power panel assembly based on output noise suppression and ripple attenuation. The power panel assembly comprises an input EMI electromagnetic compatibility module, a core power conversion module and an output noise suppression module. The input EMI electromagnetic compatibility module comprises a composite anti-surge circuit, the composite anti-surge circuit is formed by connecting a transient voltage suppressor diode, a metal oxide varistor and a self-recovery fuse in series, the clamping voltage of the transient voltage suppressor diode is 85 V, the peak power consumption is larger than or equal to 1500 W, the nominal voltage of the metal oxide varistor is 100 V, and the self-recovery fuse is connected with the transient voltage suppressor diode. The through-flow capacity is greater than or equal to 5kA; the core power conversion module comprises an isolation DC / DC power conversion unit and a three-dimensional stacked LC filter circuit, and the isolation DC / DC power conversion unit comprises at least one hot backup module, supports 9-36V input voltage and outputs multiple independent voltages.

Description

Technical Field

[0001] The invention belongs to the field of power board components, and in particular relates to a power board component based on output noise suppression and ripple attenuation. Background Art

[0002] At present, as one of the core components of electronic equipment, the performance of power board components directly affects the stability, efficiency and reliability of the equipment. As electronic equipment develops towards high integration, high power density and high performance, the output noise and ripple problems of power board components have become increasingly prominent and have become an important factor restricting the performance of equipment. Output noise and ripple will not only interfere with the normal operation of the equipment, but may also cause signal distortion, data errors and even hardware damage. Therefore, power board component technology based on output noise suppression and ripple attenuation has become a hot topic in current research. However, although relevant technologies have made significant progress in recent years, existing power board components still have many shortcomings in practical applications, which limit their further performance improvement and wide application.

[0003] Existing power board components have limitations in output noise suppression. Output noise is usually caused by the high-frequency switching action of the switching power supply. Existing technologies usually use simple filtering circuits or shielding measures to suppress noise, but these methods have limited effect on high-frequency noise suppression. For example, the traditional LC filter circuit has a good suppression effect on low-frequency noise, but its attenuation ability for high-frequency noise is insufficient; and although shielding measures can reduce noise radiation, it is difficult to completely eliminate the impact of noise on the circuit. In addition, the existing system lacks the ability to accurately locate and analyze the noise source, and cannot optimize the noise suppression strategy in a targeted manner, resulting in unsatisfactory noise suppression effect.

[0004] Existing power board components do not perform well in ripple attenuation. Ripple is a periodic fluctuation in the output of a power supply, usually caused by imperfections in the rectification and filtering circuits. Existing technologies usually use large-capacity capacitors or multi-stage filtering circuits to attenuate ripple, but these methods have limited effectiveness when dealing with high-frequency ripple. For example, although large-capacity capacitors can smooth low-frequency ripple, their equivalent series resistance (ESR) and equivalent series inductance (ESL) limit their ability to attenuate high-frequency ripple; and although multi-stage filtering circuits can improve the ripple attenuation effect, they increase the complexity and cost of the circuit. In addition, the existing system lacks the ability to monitor and dynamically adjust the ripple characteristics in real time, and cannot dynamically optimize the ripple attenuation strategy according to load changes, resulting in unstable ripple suppression effects.

[0005] The integration and power density of existing power board assemblies are relatively low, making it difficult to meet the requirements of modern electronic devices. As electronic devices develop towards miniaturization and high performance, power board assemblies need to achieve higher power output and lower noise ripple within a limited space. However, existing technologies usually adopt discrete components or simple modular designs, making it difficult to achieve high integration and high power density. For example, the layout and wiring of discrete components may introduce additional noise and ripple, while simple modular designs are difficult to meet the power requirements of complex devices. In addition, existing systems lack optimized designs for thermal management and electromagnetic compatibility (EMC), resulting in thermal failure or electromagnetic interference problems prone to occur under high power density.

[0006] The intelligence level of existing power board assemblies is relatively low, making it difficult to achieve automatic control and optimization. With the development of Internet of Things and artificial intelligence technologies, intelligence has become an important development direction for power board assemblies. However, existing systems usually rely on simple control circuits or preset parameters to operate, lacking real-time monitoring and feedback mechanisms for output noise and ripple. For example, when the load changes or the ambient temperature fluctuates, existing systems cannot automatically adjust filtering parameters or control strategies, resulting in a decline in the noise and ripple suppression effect. In addition, existing systems lack the collaborative ability with other devices (such as load devices, control systems), making it difficult to achieve intelligent management of the entire system.

[0007] There are potential risks in the reliability and lifespan of existing power board assemblies. Output noise and ripple not only affect the performance of devices but may also lead to early failure of power board assemblies. For example, high-frequency noise may cause electromagnetic interference and thermal loss of components, while ripple may shorten the lifespan of capacitors. Existing technologies usually lack in-depth research on the impact of noise and ripple on the lifespan of components, making it difficult to provide effective lifespan prediction and maintenance strategies. In addition, existing systems perform poorly in terms of fault detection and fault tolerance capabilities, making it difficult to detect and handle potential faults in a timely manner, resulting in a decline in system reliability.

[0008] Although the power board assembly technology based on output noise suppression and ripple attenuation has played an important role in electronic devices, there are still significant deficiencies in terms of noise suppression effect, ripple attenuation ability, integration and power density, intelligence level, as well as reliability and lifespan in existing technologies. These drawbacks limit the further improvement and wide application of the performance of power board assemblies. Therefore, developing a new type of power board assembly technology to overcome the deficiencies of existing technologies has become an important research direction in the current field of electronic devices. By introducing high-frequency noise suppression technology, dynamic ripple attenuation strategy, high-integration design, intelligent control method, and enhanced reliability design, it is expected to achieve higher-performance, more intelligent, and more reliable power board assemblies in the future, thus providing stronger guarantee for the stable operation of electronic devices. Summary of the Invention

[0009] The present invention provides a power board assembly based on output noise suppression and ripple attenuation. This power board assembly solves the problems of insufficient output noise and ripple suppression, weak surge resistance, and short power-off maintenance time in traditional power systems, and improves the stability, reliability, and electromagnetic compatibility of the power system.

[0010] The technical solution of the present invention is implemented as follows: A power board assembly based on output noise suppression and ripple attenuation includes an input EMI electromagnetic compatibility module, a core power conversion module, and an output noise suppression module;

[0011] The input EMI electromagnetic compatibility module includes a composite surge protection circuit, which is composed of a transient voltage suppression diode, a metal oxide varistor, and a self-recovery fuse connected in series. The clamping voltage of the transient voltage suppression diode is 85V, and the peak power consumption ≥ 1500W. The nominal voltage of the metal oxide varistor is 100V, and the current-carrying capacity ≥ 5kA;

[0012] The core power conversion module includes an isolated DC / DC power conversion unit and an LC filter circuit with a three-dimensional stacked layout. The isolated DC / DC power conversion unit contains at least one hot backup module, supporting an input voltage of 9 - 36V and outputting multiple independent voltages;

[0013] The output noise suppression module includes a parasitic LC ripple attenuation network and an EMI common-mode noise suppression circuit. The parasitic LC ripple attenuation network is composed of a second-order LC filter, and the ripple attenuation ratio ≥ 40dB;

[0014] The power board assembly further includes a power-off maintenance management unit, which includes a capacitor energy storage module, a bidirectional DC / DC converter, and a monitoring controller. The monitoring controller dynamically adjusts the RC charge and discharge time constant based on a fuzzy PID algorithm and real-time collects the input voltage, the state of charge of the capacitor, and the load current.

[0015] Surge protection circuits usually use a single transient voltage suppression diode or varistor, with limited suppression ability and difficulty in dealing with high-energy surges (such as a current-carrying capacity of 5kA). This solution uses a transient voltage suppression diode (clamping voltage 85V, peak power consumption ≥ 1500W), a metal oxide varistor (nominal voltage 100V, current-carrying capacity ≥ 5kA), and a self-recovery fuse connected in series to form a composite surge protection circuit, significantly improving the surge resistance and avoiding the risk of overload damage to a single device. Traditional DC / DC conversion units lack redundant design, and a single failure can cause the system to power off. This solution integrates at least one hot backup module in the isolated DC / DC power conversion unit, supporting an input voltage of 9 - 36V and outputting multiple independent voltages, ensuring the high reliability and continuity of the power system.

[0016] Existing LC filter circuits mostly adopt planar layouts, which occupy a large space and have limited filtering effects. This solution optimizes the structural design of the LC filter circuit through a three-dimensional stacked layout, significantly reducing the circuit volume, while improving the filtering efficiency and space utilization rate. Traditional ripple suppression mostly uses first-order LC filtering, and the attenuation effect is limited (usually ≤ 20 dB). This solution uses a second-order LC filter to form a parasitic LC ripple attenuation network, achieving a ripple attenuation ratio ≥ 40 dB and significantly reducing the output ripple noise. This solution optimizes the design of the EMI common-mode noise suppression circuit and combines it with the parasitic LC ripple attenuation network, significantly enhancing the high-frequency noise suppression ability and meeting strict electromagnetic compatibility requirements. A power-off maintenance management unit is composed of a capacitor energy storage module, a bidirectional DC / DC converter, and a monitoring controller, and dynamically adjusts the RC charge and discharge time constant based on the fuzzy PID algorithm, real-time collects the input voltage, the state of charge of the capacitor, and the load current, realizing efficient energy management and long-time power-off maintenance.

[0017] As a preferred embodiment, the composite surge protection circuit further includes an input spike voltage suppression unit. A transient voltage suppression diode is connected in series at the front end of the input spike voltage suppression unit, and a metal oxide varistor is connected in parallel at the rear end. And the rated current of the self-recovery fuse is 120% of the nominal input current; the input EMI electromagnetic compatibility module further includes a π-type filter topology, which is composed of a common-mode inductor, an X2 capacitor, and a differential-mode inductor, and the shielding structure is encapsulated by a double-layer copper-plated aluminum shell.

[0018] As a preferred embodiment, the capacitance of the supercapacitor energy storage module in the power-off maintenance management unit is 100F / 32V, and the efficiency of the bidirectional DC / DC converter ≥ 95%; the monitoring controller adapts to different load requirements by dynamically adjusting the RC charge and discharge time constant to be 0.1 s - 10 s, and the output voltage fluctuation during power-off maintenance ≤ ±2%.

[0019] As a preferred embodiment, the isolated DC / DC power conversion unit of the core power conversion module includes at least 5 outputs of 15V / 5W, 2 outputs of 5V / 5W, and 1 output of 5V / 10W; the hot backup module is a dual-channel 24V / 60W parallel design, and the fault switching time ≤ 10 μs, and the LC filter circuit with a three-dimensional stacked layout uses vertical stacked PCB wiring, and the power density ≥ 50W / in 3 。

[0020] As a preferred embodiment, the output noise suppression module further includes a power output state detection unit, which uses a differential amplifier to monitor the output voltage and current in real time, and the detection accuracy is ±0.5%; the EMI common-mode noise suppression circuit is composed of a common-mode choke and a Y capacitor, and the peak-to-peak value of the output ripple ≤ 1%.

[0021] As a preferred embodiment, the fuzzy PID algorithm of the monitoring controller includes the following steps:

[0022] Collect the input voltage U in real time in , the state of charge SOC of the super capacitor, and the load current I load ;

[0023] According to the state of charge SOC of the super capacitor and the load current I load Calculate the target discharge time constant, and the formula is:

[0024] τ target =K p ·(SOC - SOC min ) + K i ·∫(I load - I ref )dt + K d ·dtd(SOC);

[0025] Among them, τ target is the target discharge time constant; I ref is the reference value of the load current; K p , K i , K d are fuzzy adaptive adjustment coefficients;

[0026] Dynamically adjust the resistance value of the RC charge and discharge circuit according to the target discharge time constant, so that the actual discharge time constant approaches the target discharge time constant, and the error tolerance ≤ 5%.

[0027] After adopting the above technical solutions, the beneficial effects of the present invention are as follows: Through innovative designs such as a composite surge protection circuit, an isolated DC / DC power conversion unit, a three-dimensional stacked LC filter circuit, a parasitic LC ripple attenuation network, an EMI common-mode noise suppression circuit, and an intelligent power-off maintenance management unit, the power supply board assembly of the present invention significantly improves the performance and reliability of the power supply system.

[0028] The composite surge protection circuit, through the series design of transient voltage suppression diodes, metal oxide varistors, and self-recovery fuses, significantly improves the surge protection ability, can effectively suppress high-energy surges (such as a 5kA current-carrying capacity), and at the same time avoids the risk of single-device overload damage. The isolated DC / DC power conversion unit, through the hot backup module design, ensures the high reliability and continuity of the power supply system, supports an input voltage of 9 - 36V, outputs multiple independent voltages, and meets the requirements of complex application scenarios. The three-dimensional stacked LC filter circuit, through optimized structural design, significantly reduces the circuit volume, and at the same time improves the filtering efficiency and space utilization rate.

[0029] The parasitic LC ripple attenuation network is designed by a second-order LC filter, achieving a ripple attenuation ratio ≥ 40 dB, significantly reducing the output ripple noise, and improving the power quality. The EMI common-mode noise suppression circuit significantly enhances the high-frequency noise suppression ability through optimized design in combination with the parasitic LC ripple attenuation network, meeting the strict electromagnetic compatibility requirements. The power-off maintenance management unit realizes efficient energy management and long-time power-off maintenance through the intelligent control of the capacitor energy storage module, bidirectional DC / DC converter, and monitoring controller, dynamically adjusting the RC charge and discharge time constants based on the fuzzy PID algorithm, and real-time collecting the input voltage, capacitor charge state, and load current, significantly improving the emergency power supply ability of the system.

[0030] This power supply board assembly has significant advantages in aspects such as surge resistance, output noise suppression, ripple attenuation, power-off maintenance management, and overall architecture design, and is suitable for power system application scenarios with high reliability and high stability. Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is the functional principle block diagram designed for the present invention;

[0033] Figure 2 It is the schematic diagram of the input EMI electromagnetic compatibility and power supply characteristic design part. Detailed Embodiments

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0035] Embodiment:

[0036] Such as Figures 1-2As shown, a power board assembly based on output noise suppression and ripple attenuation has the following working principle and working process in the specific implementation scenario of this application document: The input EMI electromagnetic compatibility module protects the input power supply through a composite surge protection circuit. The composite surge protection circuit is composed of a transient voltage suppression diode, a metal oxide varistor, and a self - reset fuse connected in series. The clamping voltage of the transient voltage suppression diode is 85V, and the peak power consumption is ≥1500W. The nominal voltage of the metal oxide varistor is 100V, and the current - carrying capacity is ≥5kA. These components work together to quickly absorb and suppress surge energy when a surge or transient over - voltage occurs in the input power supply, protecting the subsequent circuits from damage.

[0037] For example, in an industrial automation device, when an instantaneous over - voltage appears in the power grid, the composite surge protection circuit can respond quickly to ensure the safe operation of the power board assembly. Next, the core power conversion module converts the input voltage into multiple independent output voltages through an isolated DC / DC power conversion unit. The isolated DC / DC power conversion unit includes at least one hot - standby module, supporting an input voltage of 9 - 36V, ensuring that the system can still work stably when the input voltage fluctuates or some circuits fail.

[0038] For example, in a communication base station, when the input voltage fluctuates, the isolated DC / DC power conversion unit can stably output multiple independent voltages to ensure the normal operation of communication equipment. At the same time, the core power conversion module adopts a three - dimensional stacked layout LC filter circuit to further filter out power supply noise and ensure the purity of the output voltage. The output noise suppression module suppresses the noise of the output power supply through a parasitic LC ripple attenuation network and an EMI common - mode noise suppression circuit. The parasitic LC ripple attenuation network is composed of a second - order LC filter, and the ripple attenuation ratio is ≥40dB, which can effectively suppress the high - frequency ripple noise in the output power supply.

[0039] For example, in a medical device, the parasitic LC ripple attenuation network can ensure the purity of the output power supply and avoid interference from noise to precision medical equipment. The EMI common - mode noise suppression circuit further reduces the electromagnetic interference of the output power supply by suppressing common - mode noise. The power - off maintenance management unit realizes the power - off maintenance function of the power supply through a capacitor energy storage module, a bidirectional DC / DC converter, and a monitoring controller. The capacitor energy storage module stores energy when the power supply is working normally and releases energy when the power supply is powered off, ensuring that the system can still maintain operation for a period of time when powered off.

[0040] For example, in a data center, when the mains power suddenly fails, the capacitor energy storage module can release the stored energy to ensure that the devices in the data center can safely shut down or switch to the backup power supply. The bidirectional DC / DC converter converts the input voltage into the charging voltage of the capacitor energy storage module when the power supply is working properly, and converts the energy of the capacitor energy storage module into the system working voltage when the power supply fails. The monitoring controller dynamically adjusts the RC charge and discharge time constants based on the fuzzy PID algorithm, and real-time collects the input voltage, the state of charge of the capacitor, and the load current to ensure the efficient and stable charge and discharge process of the capacitor energy storage module.

[0041] For example, in a smart grid, the monitoring controller can dynamically adjust the charge and discharge strategy of the capacitor energy storage module according to the real-time load conditions to ensure the stable operation of the power grid. Through the collaborative work of each spare part, the power board assembly realizes the surge protection of the input power supply, the noise suppression and ripple attenuation of the output power supply, and the power-off maintenance function, ensuring the efficient, stable and safe operation of the power system.

[0042] The composite surge protection circuit further includes an input spike voltage suppression unit. The front end of the input spike voltage suppression unit is connected in series with a transient voltage suppression diode, and the rear end is connected in parallel with a metal oxide varistor. And the rated current of the self-recovery fuse is 120% of the nominal input current; the input EMI electromagnetic compatibility module further includes a π-type filtering topology, which is composed of a common-mode inductor, an X2 capacitor and a differential-mode inductor, and the shielding structure is encapsulated by a double-layer copper-plated aluminum shell. In this application document, the input spike voltage suppression unit of the composite surge protection circuit significantly improves the surge suppression ability through the collaborative design of connecting a transient voltage suppression diode (TVS) in series at the front end and a metal oxide varistor (MOV) in parallel at the rear end. Compared with the prior art solutions that use only TVS or MOV alone, its peak surge current absorption ability is increased by more than 50%, the response time is shortened to the 1ns level, and the 120% rated current design of the self-recovery fuse can withstand short-term overload shocks without fusing, which is especially suitable for scenarios with frequent voltage fluctuations in industrial environments (such as inverter power supply systems) to ensure the safe operation of equipment under lightning strikes or switching surges; the input EMI electromagnetic compatibility module adopts a π-type filtering topology (common-mode inductor + X2 capacitor + differential-mode inductor) combined with a double-layer copper-plated aluminum shell shielding structure, which can increase the common-mode noise attenuation to more than 60dB@1MHz and improve the shielding effectiveness by 30% compared with the traditional LC filtering scheme, effectively solving the problem of electromagnetic interference leakage in highly sensitive scenarios such as medical equipment or communication base stations.

[0043] The capacity of the supercapacitor energy storage module in the power-off maintenance management unit is 100F / 32V, and the efficiency of the bidirectional DC / DC converter is ≥95%; the monitoring controller adapts to different load requirements by dynamically adjusting the RC charge and discharge time constant to 0.1s - 10s, and the output voltage fluctuation during power-off maintenance is ≤±2%. The supercapacitor energy storage module of the power-off maintenance management unit adopts a large-capacity design of 100F / 32V, combined with a bidirectional DC / DC converter with an efficiency ≥95%, reducing the volume by 70% compared with the traditional lead-acid battery solution, with a charge and discharge cycle life exceeding 500,000 times. Moreover, the monitoring controller can adapt to a wide range of load requirements from micro-power sensors (mA level) to industrial controllers (A level) by dynamically adjusting the RC charge and discharge time constant (0.1s - 10s). When the power grid suddenly interrupts, the output voltage fluctuation is controlled within ±2%, ensuring the uninterrupted operation of critical loads in high-reliability scenarios such as financial data centers or semiconductor manufacturing equipment.

[0044] The isolated DC / DC power conversion unit of the core power conversion module includes at least 5 outputs of 15V / 5W, 2 outputs of 5V / 5W, and 1 output of 5V / 10W; the hot backup module is designed with a dual 24V / 60W parallel connection, and the fault switching time is ≤10μs. Moreover, the three-dimensional stacked layout LC filter circuit uses vertical stacked PCB wiring, and the power density is ≥50W / in 3 The isolated DC / DC power conversion unit of the core power conversion module provides multiple outputs of 5 outputs of 15V / 5W, 2 outputs of 5V / 5W, and 1 output of 5V / 10W. Through independent winding design, cross-interference is avoided, and the efficiency is increased by 15% compared with the traditional single-output solution. At the same time, the hot backup module adopts a dual 24V / 60W parallel architecture, combined with a fault switching mechanism of ≤10μs, which can achieve seamless redundant power supply in extreme environments such as aerospace power supplies or railway signal systems; the three-dimensional stacked layout LC filter circuit improves the power density to more than 50W / in3 through vertical stacked PCB wiring, saving 60% of the space compared with the planar layout, and is suitable for space-constrained scenarios such as airborne electronic equipment or portable military radars.

[0045] The output noise suppression module further includes a power output status detection unit, which uses a differential amplifier to monitor the output voltage and current in real time, with a detection accuracy of ±0.5%; the EMI common-mode noise suppression circuit is composed of a common-mode choke coil and a Y capacitor, and the peak-to-peak value of the output ripple ≤ 1%. The power output status detection unit of the output noise suppression module uses a differential amplifier to achieve a voltage and current detection accuracy of ±0.5%, reducing the error by 80% compared with the traditional operational amplifier scheme, and can accurately identify load mutations at the microsecond level (such as laser pulse driving). The EMI common-mode noise suppression circuit suppresses the peak-to-peak value of the output ripple to ≤ 1% through the cascaded design of the common-mode choke coil and the Y capacitor, reducing the ripple by 3 times compared with the conventional π-type filter circuit, meeting the application requirements of gene sequencers or high-precision ADC modules, etc., which have strict requirements for power purity.

[0046] The fuzzy PID algorithm of the monitoring controller includes the following steps:

[0047] Real-time collect the input voltage U in 、the state of charge SOC of the supercapacitor and the load current I load ;

[0048] According to the state of charge SOC of the supercapacitor and the load current I load Calculate the target discharge time constant, and the formula is:

[0049] τ target =K p ·(SOC - SOC min ) + K i ·∫(I load - I ref )dt + K d ·dtd(SOC);

[0050] Among them, τ target is the target discharge time constant; I ref is the reference value of the load current; K p 、K i 、K d are fuzzy adaptive adjustment coefficients;

[0051] Dynamically adjust the resistance value of the RC charge and discharge circuit according to the target discharge time constant, so that the actual discharge time constant approaches the target discharge time constant, and the error tolerance ≤ 5%.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power board assembly based on output noise suppression and ripple attenuation, characterized in that: Including input EMI electromagnetic compatibility module, core power conversion module and output noise suppression module; The input EMI electromagnetic compatibility module includes a composite anti-surge circuit, which is composed of a transient voltage suppression diode, a metal oxide varistor and a self-recovery fuse connected in series. The clamping voltage of the transient voltage suppression diode is 85V, the peak power consumption is ≥1500W, and the nominal voltage of the metal oxide varistor is 100V, and the current capacity is ≥5kA; The core power conversion module includes an isolated DC / DC power conversion unit and a three-dimensional stacked LC filter circuit, wherein the isolated DC / DC power conversion unit includes at least one hot backup module, supports an input voltage of 9-36V, and outputs multiple independent voltages; The output noise suppression module includes a parasitic LC ripple attenuation network and an EMI common mode noise suppression circuit, wherein the parasitic LC ripple attenuation network is composed of a second-order LC filter, and the ripple attenuation ratio is ≥40dB; The power board assembly also includes a power-off maintenance management unit, which includes a capacitor energy storage module, a bidirectional DC / DC converter and a monitoring controller. The monitoring controller dynamically adjusts the RC charging and discharging time constant based on a fuzzy PID algorithm, and collects input voltage, capacitor charge state and load current in real time.

2. A power board assembly based on output noise suppression and ripple attenuation as claimed in claim 1, characterized in that: The composite anti-surge circuit also includes an input spike voltage suppression unit, a transient voltage suppression diode is connected in series at the front end of the input spike voltage suppression unit, a metal oxide varistor is connected in parallel at the rear end, and the rated current of the resettable fuse is 120% of the nominal input current; the input EMI electromagnetic compatibility module further includes a π-type filter topology, which is composed of a common-mode inductor, an X2 capacitor and a differential-mode inductor, and the shielding structure adopts a double-layer copper-plated aluminum shell package.

3. A power board assembly based on output noise suppression and ripple attenuation as claimed in claim 1, characterized in that: The capacity of the supercapacitor energy storage module in the power-off maintenance management unit is 100F / 32V, and the efficiency of the bidirectional DC / DC converter is ≥95%; the monitoring controller dynamically adjusts the RC charging and discharging time constant to 0.1s-10s to adapt to different load requirements, and the output voltage fluctuation during the power-off maintenance period is ≤±2%.

4. A power board assembly based on output noise suppression and ripple attenuation as claimed in claim 1, characterized in that: The isolated DC / DC power conversion unit of the core power conversion module includes at least 5 15V / 5W outputs, 2 5V / 5W outputs and 1 5V / 10W output; the hot backup module is a dual 24V / 60W parallel design, the fault switching time is ≤10μs, and the LC filter circuit of the three-dimensional stacking layout adopts vertical stacked PCB wiring, and the power density is ≥50W / in 3 .

5. A power board assembly based on output noise suppression and ripple attenuation as claimed in claim 1, characterized in that: The output noise suppression module also includes a power supply output state detection unit, which uses a differential amplifier to monitor the output voltage and current in real time, with a detection accuracy of ±0.5%; the EMI common-mode noise suppression circuit is composed of a common-mode choke and a Y capacitor, and the output end ripple peak-to-peak value is ≤1%.

6. A power board assembly based on output noise suppression and ripple attenuation as claimed in claim 1, characterized in that: The fuzzy PID algorithm of the monitoring controller comprises the following steps: Real-time acquisition of input voltage U in , supercapacitor state of charge SOC and load current I load ; According to the supercapacitor charge state SOC and load current I load Calculate the target discharge time constant using the formula: τ target =K p ·(SOC-SOC min )+K i ·∫(I load -I ref )dt+K d ·dtd(SOC); Among them, τ target is the target discharge time constant; I ref is the reference value of load current; K p , K i , K d is the fuzzy adaptive adjustment coefficient; The resistance value of the RC charge-discharge circuit is dynamically adjusted according to the target discharge time constant, so that the actual discharge time constant approaches the target discharge time constant, and the error tolerance is ≤5%.

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