An AC / DC power supply control system

Abstract

The present invention discloses an AC / DC power supply control system. The system comprises a three-phase full-bridge rectifier for receiving input voltage from a three-phase power grid and converting it into a pulsating DC voltage, which is then sent to an LC filter module. The LC filter module is used to filter the pulsating DC voltage to obtain a smooth DC voltage. An IGBT inverter module is used to receive the smoothed DC voltage and invert it according to a PWM control signal output by a main control board, generating AC and DC pulse voltages required by an isolation transformer and sending the voltages to the isolation transformer. The isolation transformer generates a secondary voltage, which is then sent to an output filter module. The output filter module is used to filter the secondary voltage. Furthermore, by adding an IMDC comprehensive judgment channel to the existing single-circuit, fully digital closed-loop system, a faster voltage regulation response is achieved in the event of sudden load changes or input fluctuations, while simultaneously taking into account switching losses and protection margins within the full power range.

Description

Technical Field

[0001] The present invention belongs to the technical field of all-digital AC / DC power supplies, and in particular relates to an AC / DC power supply control system. Background Art

[0002] With the growing demand for multi-standard AC / DC power supplies in applications such as aviation power supplies, airborne radar, electric vehicles, and portable field equipment, the industry is generally adopting a typical topology of "three-phase full-bridge rectification + LC filtering + IGBT full-bridge inverter + isolation transformer," supplemented by fully digital closed-loop control using an MCU. This type of system typically uses voltage and current sensors to scale the hundreds of volts of bus voltage and load current to 0-3V, which can be sampled by the MCU. A single MCU then performs PWM generation, PI or PID calculations, and fault monitoring. While this system offers advantages in terms of circuit simplicity and low cost, it also has significant disadvantages, primarily in the following three areas:

[0003] The static PWM carrier strategy cannot achieve both efficiency and safety:

[0004] Existing solutions often set the PWM carrier frequency and dead time to fixed values ​​during the design phase to prevent shoot-through caused by IGBT parasitic capacitance and turn-on delay. However, when the load switches from no-load to full load, or when the input bus voltage suddenly drops and the inverter temperature rises rapidly, these fixed parameters make it difficult to strike a balance between "low switching losses" and "sufficient safety margin." This often leads to low light-load efficiency, shortened device life under high temperature conditions, and even IGBT shoot-through breakdown in extreme cases.

[0005] Single-source closed-loop detection responds slowly to transient conditions:

[0006] Most existing power control systems use only bus voltage or output voltage as closed-loop feedback. When a load step change of 50% or more occurs within a sub-millisecond timescale, traditional PI / PID loops require several control cycles to stabilize, easily generating tens-of-volt undershoots and overshoots. Furthermore, increased ripple caused by aging bus capacitors and transient input dips caused by grid surges are often not identified and addressed promptly.

[0007] Lack of multi-dimensional health monitoring and preventive protection:

[0008] Traditional solutions typically implement overcurrent, overvoltage, or overtemperature protection at the MCU software level, with trigger thresholds often being "hard switches." Given the tens to hundreds of microseconds of latency introduced by ADC sampling and software interrupts, rapid changes often cannot be discerned in detail, forcing the PWM to be abruptly shut down. This not only impacts system availability but also fails to provide early warning of progressive failures such as component aging (e.g., increased ESR of bus capacitors) and heat dissipation failure.

[0009] To address these shortcomings, industry literature has proposed adding sliding window algorithms within the MCU or simple threshold comparison circuits on the FPGA side. However, these approaches still fail to achieve multi-source information fusion, microsecond-level decision-making, and adaptive dynamic adjustment of carrier and dead-zone. Therefore, a new control system is urgently needed that can collect multi-dimensional signals in parallel at the hardware level, comprehensively analyze operating conditions, and instantly reconfigure PWM parameters to improve the safety, energy efficiency, and maintainability of AC / DC power supplies under complex operating conditions. Summary of the Invention

[0010] In order to solve the above problems existing in the prior art, the present invention provides an AC / DC power supply control system, comprising a three-phase full-bridge rectifier, an LC filter module, an IGBT inverter module, an isolation transformer, an output filter module, and a voltage sensor connected in sequence, wherein the drive signal of the IGBT inverter module is output by a main control board;

[0011] The system further includes a comprehensive judgment circuit for dynamically adjusting the PWM carrier frequency and dead time of the IGBT inverter module within a microsecond time scale;

[0012] The comprehensive judgment circuit receives at least the following two types of real-time data signals:

[0013] a bus voltage sampling signal from the voltage sensor isolation-shift-clamp link;

[0014] At least one comprehensive operating condition signal selected from a load current sampling signal, a heat sink temperature signal, a rectifier input side line-line voltage signal, and PWM duty cycle historical data;

[0015] The comprehensive judgment circuit comprises:

[0016] A digital signal processing unit for synchronously sampling and feature extraction of the real-time data signal;

[0017] A coarse classification unit for working conditions based on fuzzy rules, and a parameter fine-tuning unit based on a gradient boosting decision model;

[0018] The carrier frequency division code and dead zone timing code after the decision are written into the event trigger interface of the PWM timing register through the programmable logic matrix.

[0019] Preferably, the digital signal processing unit calculates the mean and standard deviation of the bus voltage sampling signal to obtain the ripple factor, performs differential on the load current sampling signal to obtain the transition amplitude, and performs time differential on the heat sink temperature signal to obtain the temperature rise rate.

[0020] Preferably, the working condition coarse classification unit adopts no less than 8 Mamdani-type fuzzy rules, takes ripple factor, load transition amplitude and temperature rise rate as input, and outputs four working conditions: dangerous, overload, normal or no-load.

[0021] Preferably, the voltage sensor adopts a topology of two-stage isolation conversion, step-down shift and symmetrical clamping, and connects an RC low-pass filter network and a ground protection line in series after the clamping node to improve the common mode rejection ratio and ripple measurement accuracy.

[0022] Preferably, the parameter fine-tuning unit is a gradient boosting model containing multiple decision trees, the input of which is a sliding window feature vector containing at least ripple factor, load transition amplitude, temperature rise rate, bus voltage mean and PWM duty cycle historical data, and the output is a continuously adjustable carrier frequency and dead time prediction value.

[0023] Preferably, the event trigger interface encodes the carrier frequency division code and the dead zone timing code into a 14-bit control word, and writes it into the programmable logic matrix within 5µs via a 20MHz bus to preempt the normal PWM update channel of the main control board to achieve immediate effect.

[0024] Preferably, the main clock of the main control board is synchronously provided to the comprehensive judgment circuit after differential buffering, and the comprehensive judgment circuit returns the sampling completion flag to the main control board through a single-line handshake signal to ensure end-to-end synchronization of bus voltage and load current sampling.

[0025] Preferably, the comprehensive judgment circuit monitors the bus voltage charging slope during the system cold start process, and outputs a startup abnormal event frame to the host computer when it is detected that the charging time constant exceeds a set threshold.

[0026] An AC / DC power supply control method, applied to the above-mentioned AC / DC power supply control system, is characterized by comprising the following steps:

[0027] A) Periodically and synchronously sampling bus voltage, load current and at least one operating condition signal;

[0028] B) extracting features from the sampled data and obtaining a rough classification of the working conditions based on fuzzy rules;

[0029] C) Using the gradient boosting model to predict the optimal carrier frequency and dead time under non-hazardous and non-no-load conditions;

[0030] D) writing the decision result of step B or step C into the PWM timing register through the event trigger interface, so that the carrier frequency and dead time of the IGBT inverter module are updated within one PWM cycle;

[0031] E) The main control board performs conventional voltage-current closed-loop regulation to eliminate residual errors.

[0032] One or more technical solutions provided in the present invention have at least the following technical effects or advantages:

[0033] This invention utilizes a fully digital control system, centered around an MCU, to achieve digital sampling, monitoring, and control of all power supply parameters. This technical solution significantly reduces the complex analog circuitry and component count required in traditional analog control systems. The simplified circuit architecture not only reduces overall system power consumption but also reduces circuit board size, improving system integration and reliability. Furthermore, the increased precision and stability of the digital control system further enhances the performance of the power supply system.

[0034] The present invention adds an IMDC comprehensive judgment channel on the basis of the original single-loop full-digital closed loop, integrates multi-source information such as bus ripple, load current, device temperature rise, grid-side voltage and duty cycle in real time, adopts a two-level judgment of "fuzzy rules + LightGBM", and directly writes the PWM register through the event trigger interface hardware, so that the system can adaptively adjust the carrier frequency and dead time within milliseconds or even microseconds, thereby achieving faster voltage regulation response when the load changes suddenly or the input fluctuates, taking into account both switching loss and protection margin within the full power range, effectively suppressing output overshoot and undershoot, improving light load efficiency, and extending device life, and realizing fault warning by monitoring ripple characteristics and charging slope, significantly enhancing the system's safety, energy efficiency and maintenance friendliness.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is an architecture diagram of the system provided by the present invention;

[0037] Figure 2 The circuit provided by the present invention Figure 1 ;

[0038] Figure 3 is a structural diagram of the voltage sensor provided by the present invention;

[0039] Figure 4 This is a module diagram of the comprehensive judgment circuit provided by the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto.

[0041] like Figure 1-3As shown, the present invention provides an AC / DC power supply control system, comprising: a three-phase full-bridge rectifier, an LC filter module, an IGBT inverter module, an isolation transformer, an output filter module, and a voltage sensor connected in sequence; the three-phase full-bridge rectifier is connected to a three-phase power grid; the output filter module is connected to a user load; the IGBT inverter module signal is connected to a main control board (MCU);

[0042] The three-phase full-bridge rectifier D1 is used to receive the input voltage of the three-phase power grid and convert it into a pulsating DC voltage and send it to the LC filter module;

[0043] The LC filter modules L1 and C1-C2 are used to filter the pulsating DC voltage to obtain a smooth DC voltage and send it to the IGBT inverter module;

[0044] The IGBT inverter modules Q3-Q6 are used to receive the smoothed DC voltage and perform inversion according to the PWM control signal output by the main control board to generate the AC and DC pulse voltages required by the isolation transformer and send them to the isolation transformer;

[0045] The isolation transformer T1 is used to electrically isolate the IGBT inverter module and the output filter module, and convert the AC and DC pulse voltages to form a secondary voltage and send it to the output filter module;

[0046] The output filter module C3 is used to filter the secondary voltage and then transmit it to the user load to provide the required power to the user;

[0047] The voltage sensor is used to collect the voltage of the three input power grids to form a voltage sampling signal; output the voltage of the user load, and send the voltage sampling signal to the main control board for parameter calculation and control adjustment, generate a voltage control signal and send it to the IGBT inverter module.

[0048] Furthermore, the IGBT inverter module is composed of four switch tubes Q3-Q6 to form a full-bridge structure;

[0049] The main control board controls the switching on and off of each of the switch tubes by outputting PWM control signals (PWM1-PWM4 control signals of the drive interface), thereby adjusting the output voltage and current of the IGBT inverter module.

[0050] By adjusting the frequency and duty cycle of the PWM signal and the transformation ratio of the isolation transformer T1, the output of 115V / 400Hz medium-frequency single-phase / three-phase AC power and various DC power supplies such as 270V and 28V can be achieved.

[0051] Furthermore, the voltage sensor is connected in parallel with a current sensor, and the current sensor is used to collect input and output currents of the system.

[0052] Furthermore, the voltage sensor includes: a sensor, a step-down circuit, a level shift circuit and a voltage clamp circuit connected in series in sequence; and converts the input / output voltage into a 0-3V voltage signal that can be recognized by the main control board.

[0053] The sensor is used to isolate and convert a voltage signal of several hundred volts (V) or a current signal of several hundred amperes (A) into a ±15V voltage signal;

[0054] The step-down circuit (composed of transistor U1, resistor R1, resistor R11, resistor R13, and resistor R15) and the level shift circuit (composed of transistor U2, resistor R2, resistor R12, and resistor R14) are used to convert the ±15V signal into a 0-3V signal;

[0055] The clamping circuits D1 and D2 are used to limit signals exceeding the range of 0-3V to this range, thereby protecting the AD port of the MCU from overvoltage damage.

[0056] Furthermore, the system also includes: a thyristor and a power resistor connected in series at the input end of the three-phase full-bridge rectifier; the thyristor and the power resistor are used together to limit the current impact at the moment of power-on to protect circuit components.

[0057] When the power is first turned on, the thyristor is not conducting, and the current charges the downstream capacitor through the power resistor. The power resistor limits the instantaneous charging current of the downstream capacitor. After a certain period of time, the downstream capacitor is fully charged, the thyristor is turned on, and the current flows through the thyristor to the downstream capacitor, and the power resistor is no longer conducting.

[0058] Compared with the existing technology, the fully digital controlled AC / DC power supply control system of the present invention has significant technical effects and advantages. The following is a detailed analysis of the technical solution:

[0059] (1) Simplify circuit structure and reduce power consumption:

[0060] This invention utilizes a fully digital control system, centered around an MCU, to achieve digital sampling, monitoring, and control of all power supply parameters. This technical solution significantly reduces the complex analog circuitry and component count required in traditional analog control systems. The simplified circuit architecture not only reduces overall system power consumption but also reduces circuit board size, improving system integration and reliability. Furthermore, the increased precision and stability of the digital control system further enhances the performance of the power supply system.

[0061] (2) Unified hardware circuit reduces production and debugging costs:

[0062] This invention designs a hardware circuit that can simultaneously meet the requirements of DC and AC power output. By flexibly configuring the MCU's control strategy and parameters, seamless switching between DC and AC power is achieved. This technical solution significantly simplifies the procurement, production, commissioning, and after-sales processes and costs. Enterprises no longer need to purchase and produce hardware circuits for different power systems, reducing operating costs and improving production efficiency.

[0063] (3) Flexible control strategy improves load adaptability:

[0064] The fully digital control system of the present invention supports a variety of control algorithms, such as zero-error control, fractional-order PI&D control, and fuzzy adaptive PID control. These control algorithms can be flexibly selected and adjusted based on specific load characteristics. Through flexible control strategies, the present invention ensures that the power supply system maintains optimal operating conditions under various load conditions. This not only improves the output stability and efficiency of the power supply system, but also extends the service life of the equipment.

[0065] (4) Intelligent and remote upgrade capabilities improve system scalability:

[0066] The control system of the present invention features intelligent control capabilities and supports remote control strategy upgrades. Data exchange with a host computer and remote control can be easily achieved through the MCU's serial communication interface. Its intelligent and remote upgrade capabilities enable the present invention to keep pace with technological developments and facilitate future upgrades and optimizations. Enterprises can adjust and improve control strategies based on actual needs, enhancing the system's scalability and maintainability.

[0067] (5) Comprehensive monitoring and protection functions improve system reliability:

[0068] The control system of the present invention incorporates comprehensive monitoring and protection capabilities. The MCU samples and monitors input and output voltages and currents in real time, immediately initiating protection routines upon detecting an anomaly. These comprehensive monitoring and protection capabilities enable the present invention to promptly detect and address various faults and anomalies, ensuring the safe and stable operation of the power supply system. This not only improves system reliability but also reduces failure rates and maintenance costs.

[0069] Furthermore, if Figure 4 As shown, to improve the inverter's responsiveness to rapid load changes and busbar anomalies, the existing fully digital control framework also includes an integrated judgment circuit (IMDC, Intelligent Multi-Direction Comparator). The IMDC and MCU are co-located on the same four-layer immersion gold PCB, but are independently powered and isolated from the digital ground via an ADuM141E digital isolator, ensuring a high common-mode rejection ratio for the sampling chain. Specifically:

[0070] Signal acquisition and front-end wiring:

[0071] The bus voltage sampling V_adc: After passing through the four-stage link of "sensor isolation-step-down-shift-symmetrical clamping", a 47Ω / 100PFπ-type EMI filter is connected in series outside the clamping node. The signal travels only 25mm before entering the differential sampling amplifier SN65ADC1285. Its differential line pair follows a 90Ω controlled impedance and crosses once at the isolation zone.

[0072] Load current sampling I_adc: The Hall current sensor outputs a 0-3V signal, which is filtered by the same type of π and then merged into the SN65ADC1285 spare channel.

[0073] Radiator temperature T_sink: Digital thermometer DS18B20 is connected to IMDC via a single bus;

[0074] Rectified input line-to-line voltage V_grid: isolated and amplified to 0-3V by differential amplifier INA149, and uses the same analog ground reference as V_adC;

[0075] Duty cycle history duty_hist: The MCU writes the 16-bit duty cycle to the IMDC dual-port RAM via the 66MHz asynchronous bus every 1ms.

[0076] Clock synchronization and event alignment:

[0077] The MCU's 96MHz master clock is buffered by LVDs and provided to the IMDC as the Sampling_CLK (24MHz). The IMDC then divides down the clock frequency to 2.4MHz to trigger the internal 14-bit SAR ADC, achieving 10µs period multi-channel synchronous sampling. The single-wire SYNC_STROBE handshake ensures sampling timestamp alignment.

[0078] Feature extraction and two-level judgment:

[0079] DSP core calculation: Calculate the mean μ and standard deviation σ of V_adC to obtain the ripple factor ρ = σ / μ; perform a 40µs differential on I_adC to obtain the load transition ΔI; and perform a 10ms interval differential on T_sink to obtain the temperature rise rate dT / dt.

[0080] Fuzzy rule engine: 8 Mamdani rules complete rough classification within 10µs. If ρ>8% and ΔI>15%, it is judged as dangerous. If ρ<1% and ΔI<2% and dT / dt<0.1℃ / ms, it is judged as no-load. Other combinations are judged as overload or normal.

[0081] LightGBM fine-tuning: Taking a 256-dimensional input vector {ρ, ΔI, dT / dt, μ(V_adc), duty_hist, V_grid_RMS…}, 64 small gradient boosting trees of depth 5 (learning rate 0.05) are used to output the optimal carrier frequency f_carrier_opt (5-50kHz) and safe dead time dead_time_opt (250-700ns); online inference takes <5µs.

[0082] Control code issuance and logic remapping:

[0083] The IMDC sends the 4-bit frequency division code and 10-bit dead-band code to the programmable logic matrix (PLM) via the 20MHz CMOS bus, simultaneously raising dATA_READY. If fAULT_FLAG = 1 (hazardous operating condition), the PLM decoder immediately seizes the PWM update channel and, starting from the next PWM cycle, reduces the carrier frequency to 5kHz and widens the dead-band to 700ns. At no-load, the frequency is increased to 50kHz / 250ns to reduce core and switch losses.

[0084] Signal flow closed loop:

[0085] The “bus voltage isolation sampling → IMDC judgment → PLM remapping → PWM register → IGBT gate” process forms a 5-µs fast closed loop. The MCU’s outer PI loop performs millisecond-level residual correction on this basis, maintaining voltage regulation across transients while avoiding integral saturation.

[0086] Therefore, with the help of IMDC feedforward compensation, when the load suddenly increases by 50%, the 270V DC bus voltage overshoot is limited to within ±1.5% (approximately ±2.5% without IMDC), and the peak heat sink temperature drops by 6-8°C; at a typical load point of 800W, the inverter efficiency is qualitatively improved by approximately 2.8%.

[0087] The IMDC records the V_adC charging slope in real time during a system cold start. If an abnormal increase in the time constant is found, a "startup abnormality" event frame is triggered and reported to the host computer, prompting the host computer to check the bus capacitor.

[0088] At this point, IMDC has completed multi-level coupling with the original AC / DC power control system, including analog-to-digital ground isolation, clock synchronization, bus mapping, logic preemption, and health monitoring, forming a microsecond-level adaptive control closed loop, significantly improving system safety and efficiency.

[0089] After completing the aforementioned hardware coupling, this system maintains the advantages of existing fully digital control while achieving rapid adaptive operation for multiple output standards. When the IMDC detects a danger level, the inverter immediately enters low-frequency, large dead-band protection mode. When no-load is detected, it automatically enters light-load pulse skipping and shuts off the synchronous rectification MOSFET, achieving standby energy savings. The addition of a closed-loop design improves dynamic voltage regulation performance during sudden load changes without changing the main program framework.

[0090] In order to ensure the high sensitivity of IMDC to bus ripple, a 10MHz-3dBRC filter is added after the clamping node, and a 0.8mm ground shield is arranged outside the V_adC trace, which actually improves the common mode rejection ratio by about 4dB, further reducing the impact of high-frequency radio frequency interference on the LightGBM judgment accuracy.

[0091] During the system's initial power-up phase, the thyristor (SCR) is non-conductive, and the current is limited by the power resistor to charge the downstream capacitor. Once the capacitor is fully charged, the SCR turns on, bypassing the power resistor to ensure component safety. Simultaneously, the IMDC continuously monitors the V_adC curve and issues an alarm if the charging time is abnormal.

[0092] In summary, based on the "pure MCU controlled closed loop" of the original all-digital AC / DC power supply control system, the present invention integrates sampling, judgment and driving into a single-board microsecond closed loop by introducing the integrated judgment circuit IMDC and its supporting hardware / algorithm. This not only avoids the interface delay introduced by the traditional multi-board series connection, but also realizes the comprehensive analysis and real-time decision-making of the four-domain data of bus ripple, load jump, heat dissipation temperature rise and grid-side drop without adding a large number of analog components, and overall demonstrates a higher safety margin, energy efficiency and maintenance friendliness.

[0093] It is worth noting that the terms "first" and "second" in this disclosure are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0094] Although the present application is described herein with reference to various embodiments, those skilled in the art will be able to understand and implement other variations of the disclosed embodiments in practicing the claimed application by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality.

[0095] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. An AC / DC power supply control system comprising a three-phase full-bridge rectifier, an LC filter module, an IGBT inverter module, an isolation transformer, an output filter module, and a voltage sensor connected in sequence, wherein the drive signal of the IGBT inverter module is output by a main control board, and characterized in that: The system further includes a comprehensive judgment circuit for dynamically adjusting the PWM carrier frequency and dead time of the IGBT inverter module within a microsecond time scale; The comprehensive judgment circuit receives at least the following two types of real-time data signals: a bus voltage sampling signal from the voltage sensor isolation-shift-clamp link; At least one comprehensive operating condition signal selected from a load current sampling signal, a heat sink temperature signal, a rectifier input side line-line voltage signal, and PWM duty cycle historical data; The comprehensive judgment circuit comprises: A digital signal processing unit for synchronously sampling and feature extraction of the real-time data signal; A coarse classification unit for working conditions based on fuzzy rules, and a parameter fine-tuning unit based on a gradient boosting decision model; The working condition coarse classification unit adopts Mamdani type fuzzy rules, takes ripple factor, load transition amplitude and temperature rise rate as input, and outputs four working conditions: dangerous, overload, normal or no-load; The parameter fine-tuning unit is a gradient boosting model containing multiple decision trees. Its input is a sliding window feature vector containing at least ripple factor, load transition amplitude, temperature rise rate, bus voltage mean, and PWM duty cycle historical data. Its output is a continuously adjustable carrier frequency and dead time prediction value. The carrier frequency division code and dead zone timing code after the decision are written into the event trigger interface of the PWM timing register through the programmable logic matrix.

2. The AC / DC power supply control system according to claim 1, characterized in that: The digital signal processing unit calculates the mean and standard deviation of the bus voltage sampling signal to obtain the ripple factor, performs differential on the load current sampling signal to obtain the transition amplitude, and performs time differential on the heat sink temperature signal to obtain the temperature rise rate.

3. The AC / DC power supply control system according to claim 1, characterized in that: The working condition coarse classification unit adopts no less than 8 Mamdani type fuzzy rules.

4. The AC / DC power supply control system according to claim 3, characterized in that: The voltage sensor adopts a topology structure of two-stage isolation conversion, step-down shift and symmetrical clamping, and connects an RC low-pass filter network and a ground protection line in series after the clamping node to improve the common mode rejection ratio and ripple measurement accuracy.

5. The AC / DC power supply control system according to claim 1, characterized in that: The event trigger interface encodes the carrier frequency division code and the dead zone timing code into a 14-bit control word and writes it into the programmable logic matrix within 5µs via a 20MHz bus to preempt the normal PWM update channel of the main control board for immediate effect.

6. The AC / DC power supply control system according to claim 1, characterized in that: The main clock of the main control board is synchronously provided to the comprehensive judgment circuit after differential buffering. The comprehensive judgment circuit returns the sampling completion flag to the main control board through a single-line handshake signal to ensure end-to-end synchronization of bus voltage and load current sampling.

7. The AC / DC power supply control system according to claim 1, characterized in that: The comprehensive judgment circuit monitors the bus voltage charging slope during the system cold start process, and outputs a startup abnormal event frame to the host computer when it detects that the charging time constant exceeds a set threshold.

8. An AC / DC power supply control method, applied to the AC / DC power supply control system according to any one of claims 1 to 7, characterized in that: The steps include: A) Periodically and synchronously sampling bus voltage, load current and at least one operating condition signal; B) extracting features from the sampled data and obtaining a rough classification of the working conditions based on fuzzy rules; C) Using the gradient boosting model to predict the optimal carrier frequency and dead time under non-hazardous and non-no-load conditions; D) writing the decision result of step B or step C into the PWM timing register through the event trigger interface, so that the carrier frequency and dead time of the IGBT inverter module are updated within one PWM cycle; E) The main control board performs voltage-current closed-loop regulation to eliminate residual errors.

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