Multi-environment accelerated aging test platform, method and system for power electronic module

Abstract

This application relates to the field of new energy power station technology, and in particular to a multi-environment accelerated aging test platform, method, and system for power electronic modules. The platform includes: a sealed environment chamber for providing a sealed testing environment; an environmental stress simulation system, including a temperature and humidity control module, a light irradiation module, a wind speed impact module, a rain and water mist module, and a salt spray / corrosive gas module, for simulating the effects of various environmental stresses in the operating environment of the power electronic module; an electrical stress loading system, including a power control and temperature rise feedback module for the device under test, for applying working electrical stress, performing real-time monitoring and feedback, and realizing the linkage between the load and the environment; and a central control and data processing unit, which is communicatively connected to the environmental stress simulation system and the electrical stress loading system, for realizing synchronous loading, dynamic switching, and real-time monitoring of multiple environmental stresses. This application can achieve efficient and controllable accelerated aging, thereby significantly improving the authenticity and accuracy of the test.

Description

Technical Field

[0001] This application relates to the field of new energy power station technology, and in particular to a multi-environment accelerated aging test platform, method and system for power electronic modules. Background Technology

[0002] The statements in this section are merely background information related to this application and do not necessarily constitute prior art.

[0003] With the increasing proportion of renewable energy sources such as hydropower, wind power, and photovoltaic power in the power system, the power electronic modules (including photovoltaic inverter units, wind power converters, and energy storage converters) inside new energy power plants operate in complex and variable environments with frequent temperature and humidity changes, strong solar radiation, high-speed airflow, rainwater erosion, and salt spray corrosion. These multi-source stresses not only act individually on power devices but also simultaneously in a coupled manner, causing various failure modes such as solder joint fatigue, aging of packaging materials, deterioration of insulation performance, and degradation of semiconductor junctions, which significantly affect the long-term reliability of the equipment.

[0004] Existing environmental reliability testing equipment is typically designed for single stresses, such as constant temperature and humidity chambers, xenon lamp weathering chambers, and salt spray corrosion chambers. While some high-end equipment can perform combined tests of two stresses, their ability to simulate multiple stresses in a coordinated manner is generally limited. For scenarios requiring the simultaneous reproduction of multiple stress coupling effects, such as water (humidity, water mist), wind (airflow impact), light (intense light irradiation), and salt spray, existing solutions often require step-by-step transfer of samples between different devices for testing, making it difficult to maintain the continuity and synchronization of the stress application process. Furthermore, existing systems mostly employ static or sequential control modes, lacking electrical stress control linked to the real-time operating status of the device under test (such as power generation and junction temperature changes), making it impossible to dynamically adjust environmental stress parameters during testing to more accurately simulate real service conditions. These shortcomings limit the application effectiveness of multi-stress accelerated aging tests in the design verification, life prediction, and selection evaluation of new energy power electronic modules. This application addresses these deficiencies with improvements. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this application provides a multi-environment accelerated aging test platform, method and system for power electronic modules, which can achieve efficient and controllable accelerated aging, thereby significantly improving the authenticity and accuracy of the test, and effectively solving the key technical bottleneck in the reliability verification of power electronic modules, and has important industrial application value.

[0006] To achieve the above objectives, this application provides the following technical solution: Firstly, a multi-environment accelerated aging test platform for power electronic modules is provided. The platform includes: a sealed environment chamber for providing a sealed test environment; an environmental stress simulation system, including a temperature and humidity control module, a light irradiation module, a wind speed impact module, a rain and water mist module, and a salt spray / corrosive gas module, for simulating the effects of various environmental stresses in the operating environment of the power electronic module; an electrical stress loading system, including a power control and temperature rise feedback module for the device under test, for applying working electrical stress, performing real-time monitoring and feedback, and realizing the linkage between the load and the environment; and a central control and data processing unit, which is communicatively connected to the environmental stress simulation system and the electrical stress loading system, respectively, for realizing the synchronous loading, dynamic switching, and real-time monitoring of multiple environmental stresses.

[0007] Furthermore, the temperature and humidity control module includes a cooling unit, a heating unit, a humidification unit, and a dehumidification unit, and is equipped with a temperature and humidity sensor; the central control and data processing unit performs coupled temperature and humidity control, and adjusts the heating power, cooling capacity, humidification capacity, and dehumidification capacity in a coordinated manner based on temperature and humidity feedback signals, so as to achieve decoupled compensation control of temperature and humidity.

[0008] Furthermore, the light irradiation module includes an adjustable light source, a light intensity sensor, and a blackboard temperature sensor; the central control and data processing unit adjusts the light source power and ambient cooling amount according to the light intensity and blackboard temperature feedback signals to control the light intensity and limit the temperature rise caused by the light.

[0009] Furthermore, the wind speed impact module includes an adjustable speed fan and a wind speed sensor; the central control and data processing unit controls the rotation speed of the adjustable speed fan according to the set wind speed curve, and forms an adversarial control or cooperative control mode with the salt spray / corrosive gas module.

[0010] Furthermore, the rain mist module includes a water tank, a water pump, a spray pipe, and a solenoid valve; the central control and data processing unit controls the water pump flow and the opening and closing of the solenoid valve according to the rainfall intensity and water temperature settings, so as to realize the coordinated loading of rain and heat, and adjust the ambient temperature and humidity during the rain process.

[0011] Furthermore, the salt spray / corrosive gas module includes a solution tank, an atomizing nozzle, an air compressor, and a flow control valve; the central control and data processing unit controls the atomization spray and airflow distribution according to the set salt spray concentration, sedimentation rate, and wind speed, and forms an interlock or priority control with the wind speed impact module.

[0012] Furthermore, the device under test power control and temperature rise feedback module includes a programmable power supply, a power load, a device temperature sensor, and an electrical parameter acquisition unit; the central control and data processing unit dynamically adjusts the magnitude of electrical stress according to the real-time junction temperature or power status of the device under test, and adjusts the environmental stress in conjunction with it.

[0013] Furthermore, the central control and data processing unit has a stress priority arbitration mechanism, a preset stress priority matrix and concurrent interlocking rules, which automatically adjusts the loading order or amplitude of each stress when multiple stresses conflict, and triggers safety interlocking protection.

[0014] Furthermore, the stress priority matrix includes the following interlocking rules: light and water spray interlock: high-intensity light and water spray are prohibited from being turned on at the same time; salt spray and fan interlock: when the salt spray is turned on, it automatically switches to low-speed corrosion-resistant fan mode; access control and high-voltage interlock: when the hatch is not closed, all high-voltage power supplies and stress sources are cut off.

[0015] Furthermore, the central control and data processing unit adopts a modular software architecture, including: a task scheduling module for real-time scheduling and priority management of various system functions; a control logic module for implementing experimental process control and decision-making algorithms; a data acquisition module for reading all sensor and equipment status signals and performing preprocessing; and an anomaly detection module for independently monitoring the system's operating status and sensor data, and determining whether anomalies or malfunctions have occurred according to preset rules. All of the above modules communicate via a data bus to enable configurable experimental parameters, visualized operating status, and recording and analysis of experimental data.

[0016] Furthermore, the central control and data processing unit supports smooth transition control of stress switching. By setting the slope of parameter change, delay hysteresis and stage buffer control, it can realize the gradual switching between multiple stress loading states.

[0017] Furthermore, the platform also includes a data acquisition and lifetime assessment module, which is used to: acquire environmental parameters and device electrical parameters in real time; automatically determine device failure based on parameter drift criteria or functional failure criteria; and calculate acceleration factors and predict device lifetime using Arrhenius model, Peck model or Coffin-Manson model.

[0018] Furthermore, the platform also includes a security protection system, comprising: hardware security interlocking circuits, including access control switches, over-temperature protectors, and emergency stop buttons; software security monitoring modules, which monitor in real time whether various parameters exceed limits; and fire-fighting linkage devices, including temperature sensors and automatic fire extinguishing equipment.

[0019] Secondly, a multi-environment accelerated aging test method for power electronic modules is also provided. Based on the multi-environment accelerated aging test platform for power electronic modules as described above, the method includes: configuring test parameters and setting stress curves for temperature, humidity, light, wind speed, rain, and salt spray; initiating multi-stress synchronous loading and applying multi-environment stresses synchronously or sequentially according to a predetermined process; collecting environmental parameters in real time and monitoring the performance parameters of the device under test in real time to obtain performance degradation data; calculating the acceleration factor and predicting lifetime based on environmental parameters, device under test performance parameters, performance degradation data, and acceleration model; determining failure based on predefined failure criteria and recording lifetime data.

[0020] Thirdly, a reliability assessment system for power electronic modules is also provided, including the multi-environment accelerated aging test platform for power electronic modules as described above, as well as: a reliability database for storing historical test data and failure cases; a report generation module for automatically generating test reports and life assessment conclusions; and a remote monitoring interface for supporting simultaneous access and data analysis by multiple users.

[0021] Compared with the prior art, the beneficial effects of this application are as follows: Adopting a modular integrated design, it includes functional sub-modules (or subsystems) such as a sealed environment chamber, an environmental stress simulation system, an electrical stress loading system, and a central control and data processing unit. These can be flexibly combined to adapt to different test objects and operating conditions, enabling efficient and controllable accelerated aging, thereby significantly improving the authenticity and accuracy of the test. It also effectively solves the key technical bottlenecks in the reliability verification of power electronic modules and has important industrial application value.

[0022] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures pointed out in the description, claims and drawings.

[0023] The present application will be further described below with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a multi-environment accelerated aging test platform for a power electronic module according to an embodiment of this application; Figure 2 This is a schematic diagram showing the composition and interface of a multi-environment accelerated aging test platform for a power electronic module according to an embodiment of this application; Figure 3 This is a schematic diagram of a multi-stress synchronous control loop according to one embodiment of this application. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] like Figure 1 As shown, one embodiment of this application provides a multi-environment accelerated aging test platform for power electronic modules. The platform includes: a sealed environment chamber for providing a sealed test environment; and an environmental stress simulation system, which includes a temperature and humidity control module, a light irradiation module, a wind speed impact module, a rain and water mist module, and a salt spray / corrosive gas module for simulating the effects of various environmental stresses in the operating environment of the power electronic module. The electrical stress loading system includes a power control and temperature rise feedback module for the device under test, used to apply working electrical stress, perform real-time monitoring and feedback, and realize the linkage between the load and the environment; and a central control and data processing unit, which is connected to the environmental stress simulation system and the electrical stress loading system respectively, used to realize the synchronous loading, dynamic switching and real-time monitoring of multiple environmental stresses.

[0028] The above-mentioned test platform (hereinafter also referred to as this platform) will be further explained below.

[0029] The main components and functional interfaces of this platform are as follows: Environmental simulation test chamber (working chamber, also known as a closed environment chamber or environmental simulation test chamber): This is a sealed environmental cavity used to house the power module or component under test and to provide controlled environmental conditions. The chamber is made of high and low temperature resistant and corrosion-resistant materials (such as 316L stainless steel or titanium alloy lined) to adapt to a temperature range of -40 to +125℃ and harsh conditions such as salt spray and humidity.

[0030] like Figure 2As shown, the aforementioned cabin integrates multiple interfaces, including: Temperature control interface: heaters and refrigeration heat exchangers, connected via air conditioning channels to achieve cabin heating and cooling functions. Humidity control interface: humidifiers (water tank, ultrasonic atomizer, or steam generator) and dehumidifiers / condensers, which can introduce water vapor or condensate into the cabin to control relative humidity. Rain / water vapor interface: spray nozzles and piping, used to simulate rainfall or water mist condensation. Rainfall intensity (water pressure, spray flow rate) can be adjusted to simulate different precipitation conditions. Lighting interface: mounting windows for high-intensity xenon lamps, LED solar simulators, etc., providing AM1.5 spectrum light intensity, up to 1... kW / m 2 Standard solar irradiance is used to simulate solar radiation environments. Airflow / wind speed interface: a blower or fan delivers air into the cabin through ducts to simulate airflow impact and heat dissipation conditions; the wind speed is adjustable (e.g., 0–15). (m / s) to reproduce natural wind or forced air cooling environments. Polluted Atmosphere / Salt Spray Interface: A gas inlet with filtration and metering control allows the introduction of salt spray (5% NaCl solution atomized) or corrosive gases (SO2, etc.) to simulate marine atmospheres and industrial pollution environments. Electrical Connection Interface: Power, load, and measurement lines are introduced into the chamber via sealed electrical through-wall connectors, ensuring power supply, loading, and signal transmission for the device under test (DUT) under sealed conditions; high-voltage cable connectors are insulated and sealed, capable of withstanding the operating voltage of the DUT (e.g., AC / DC 1000V or higher) and are waterproof and moisture-proof. Data and Sensor Interface: Sensor interfaces and signal output ports for temperature, humidity, and light intensity are located on the chamber walls; all signal lines use sealed aviation connectors and are shielded to prevent environmental electromagnetic noise interference.

[0031] The environmental factor control system (i.e., the environmental stress simulation system) includes sub-modules such as a temperature and humidity control module (composed of a temperature control module and a humidity control module), a lighting module, a rain module, and a gas / salt spray module. Each sub-module is connected to the environmental chamber via pipes or cables. Further explanation of each sub-module follows.

[0032] Temperature control module: Composed of a refrigeration unit and a heating unit. The refrigeration section uses a mechanical compressor (single-stage compression can be used for small and medium-sized compartments, while cascade refrigeration or liquid nitrogen assistance is used for extremely low temperatures), and the heating section uses an electric heater or an infrared heater. By adjusting the supply of cold and heat, the internal temperature can be controlled within the range of -40 to +125°C, and rapid temperature changes and circulation are supported.

[0033] Humidity control module: Composed of a humidifier (i.e., a humidification unit, such as a steam generator or ultrasonic humidifier) ​​and a dehumidifying condenser (i.e., a dehumidification unit), along with a water tank, water level controller, etc. This module is highly coupled with temperature control to avoid condensation or ice blockage caused by independent control. When humidity and heat coupling are needed, the humidification function is activated to provide humidity of, for example, 85% RH; when drying is needed, the humidity is reduced to 10% RH or lower.

[0034] The illumination module (i.e., the light irradiation module) includes an adjustable light source (xenon lamp or LED array), a light intensity sensing and control unit (i.e., a light sensor), and a blackboard temperature sensor. The light source is installed outside the transparent window of the cabin, generating radiation close to the solar spectrum through a filter. The light intensity is controlled in a closed loop by the light sensor and can be set to a range of 0–1100 W / m². The central control and data processing unit adjusts the light source power and ambient cooling based on the light intensity and blackboard temperature feedback signals to control the light intensity and limit the temperature rise caused by the light.

[0035] Rain module (i.e., rain mist module): Consists of a water tank, water pump, spray piping, solenoid valve, etc. It can simulate different rainfall intensities (e.g., 1–5 mm / min), and the water temperature is controllable (e.g., room temperature or cold water for condensation testing). When not in use, the spray piping can be shut off via a valve to avoid affecting other tests.

[0036] Polluted Atmosphere / Salt Spray Module (i.e., Salt Spray / Corrosive Gas Module): This module includes a salt spray solution tank, compressed air supply (i.e., air compressor), and atomizing nozzles, or corrosive gas cylinders and flow control valves. Connected to the chamber via corrosion-resistant piping, this module can generate a controllable concentration of salt spray (e.g., 5% NaCl, with a settling rate of 1~2 ml / 80cm² per 24 hours at 35°C) or acidic gas environment within the chamber, used to assess the protective capabilities of devices.

[0037] Wind speed and airflow module (i.e., wind speed impact module): Blower and wind speed controller, used to generate airflow circulation inside the test chamber. It can be used in conjunction with the temperature and humidity control module to achieve a uniform environmental field, or it can be used alone for wind-cooled enhancement or dusty wind environments (dust particles can be added to the airflow optionally).

[0038] All environmental factor control modules (i.e., the sub-modules included in the environmental stress simulation system) are connected to the environmental chamber and central control system via standard gas, water, electrical, and data interfaces. The interface types are standardized to ensure interchangeability and compatibility. This interface design allows for the flexible addition or removal of certain environmental stress modules as needed for testing, ensuring plug-and-play functionality in hardware and command communication after each module is connected. For example, when a salt spray test is required, the salt spray module can be connected and its corresponding control functions enabled; when not needed, its piping interfaces can be closed.

[0039] The electrical stress loading system (including the device-under-test (DUT) power control and temperature rise feedback module) is a subsystem for loading and monitoring the test sample itself. It typically consists of a programmable DC power supply, AC power supply, electronic load, and power switch matrix, used to energize and pressurize the DUT, or to apply signals and loads to its internal circuitry. It also includes a measurement module to collect the DUT's electrical parameters (voltage, current, power) and temperature information (built-in thermocouples, infrared thermometers, etc.). Sometimes a dedicated power consumption simulator is used to periodically power on and off the sample according to test specifications (e.g., load dump testing for automotive electronics). This module executes a load coupling strategy in the control flow: adjusting the output according to a predetermined power curve or feedback temperature to bring the sample to the required heating level. For example, in a high-temperature bias (HAST) test, it maintains continuous power supply to the device while ensuring that the heating level does not exceed the device's rated capacity. Safety interlocks are also applied to this module: cutting off the DUT power supply if the door is opened, and immediately cutting off power if excessive leakage current is detected under high temperature and humidity conditions. To precisely control sample temperature rise, the module supports independent control of multiple channels, with each sample having corresponding power output and temperature measurement, and the controller adjusting in a closed loop for each. This module ensures that the device under test operates according to the test requirements and works in conjunction with environmental stress, achieving the goal of "testing reliability under operating conditions." Simultaneously, its rich data acquisition capabilities provide support for the analysis of test results.

[0040] Test fixtures: Connection fixtures and load circuit boards designed for different components. For example, IGBT power modules are equipped with switching test topologies, capacitors with ripple current application circuits, and printed circuit boards with high-frequency superposition circuits, etc. The fixtures are fixed by heat-resistant insulating bases inside the chamber, and the interfaces mate with through-wall connectors on the chamber walls, ensuring both electrical connection and sealing.

[0041] In this embodiment, the device-under-test (DUT) power control / temperature rise feedback module is the electrical stress control execution unit in the platform. It is responsible for applying electrical stress (voltage / current / power consumption / pulse conditions) to the sample and also for using temperature rise feedback to coordinate electrical stress with environmental stress. Key points are as follows: Electrical stress types (output forms): CV (constant voltage), CC (constant current), CP (constant power), CTj (constant junction temperature closed loop: automatic power adjustment based on Tj), periodic on / off / pulse (duty cycle / frequency / rise edge speed limiting), step / ramp / arbitrary waveform sequence.

[0042] Typical scenarios: HTOL / bias aging (high temperature and electrical charge), power cycling (on / off switching leading to Tj cycling), electrical damp heat / condensation (as per standard allowable), transient stress (derating version of short-term overvoltage / surge).

[0043] Input / Feedback: Tj or Tcase / on-board thermistor, V / I / power, junction temperature model parameters (R_th, C_th), and arbitration / interlock status (access control, salt spray / rain safety, cooling status).

[0044] Control logic: Electrical stress closed loop: e = target – meas → PID / feedforward → V / I command; Temperature rise coupling: When approaching the temperature target, the power is automatically reduced and controlled by the ambient temperature control unit to prevent overshoot; Compliance mode: Maintain V<=Vmax, I<=Imax, dV / dt / dI / dt limiting and power slope limiting; Safety / Interlock (P0 level): Door opening power off, over-temperature / leakage current / OCP / OVP / GFCI fast cut-off; Salt spray / rain stage default no power or derating + isolation according to "Conditional Concurrency (M1)"; BPT upper limit is observed when the light intensity is high.

[0045] Data and Compliance: Record V / I / P / Tj at 1 Hz and above, with event-level millisecond timestamps (over-temperature, interlocking trigger, and deduction actions).

[0046] The electrical stress loading system communicates with the central control system via a control interface, and can synchronously apply the required electrical stress waveform and amplitude according to a predetermined program. The system also includes protective components (such as fast-acting fuses and overcurrent relays) to prevent cascading damage caused by short circuits or failures of the tested component.

[0047] Central Control and Communication System (i.e., Central Control and Data Processing Unit, also known as Central Control System): The core of the entire platform's monitoring and scheduling, including industrial PCs / programmable logic controllers (PLCs), data acquisition units, and host computer software. The central control system connects to various functional modules and sensor nodes via wired Ethernet, industrial buses (such as CAN, Modbus), or necessary wireless connections. The central control system provides the following interfaces and functions: User interface: The current stress parameters (temperature, humidity, etc.) and equipment status are displayed via a host computer software GUI or touchscreen. Users can configure test parameters, start and stop tests, monitor real-time data, and intervene in emergencies on the interface.

[0048] Control command interface: The central controller sends setting commands (such as setting temperature curves and humidity values) to the temperature, humidity, and light regulation modules, and receives status feedback from each module. A hierarchical control architecture is adopted: lower-level module controllers (PID temperature controllers, humidity controllers, etc.) perform local closed-loop control, while the central control system acts as the upper-level coordinator, responsible for setpoint management and multi-module linkage.

[0049] Data Interface: The central system reads signals from various sensors and the measured components through the data acquisition unit. It supports multi-channel high-speed acquisition (analog, voltage, current, strain, etc.) and unified timestamp recording. The data interface follows standard communication protocols, such as Modbus TCP / RTU for acquiring environmental sensor readings and high-speed ADCs for acquiring voltage and current waveforms of power devices. All acquired data is transmitted to the host computer in real time for storage and use in real-time monitoring and subsequent analysis.

[0050] External interfaces include an Ethernet interface and a USB / storage interface for exporting data and interacting with external systems. It can also connect to other laboratory equipment or cloud platforms via Ethernet for remote monitoring and data sharing.

[0051] The communication logic of the central control system prioritizes safety and order. It employs a master-slave polling or publish / subscribe mechanism to obtain the status of each module and periodically verifies the communication link. For critical controls (such as emergency stop interlocks), hard-wired direct-connect signals are used to ensure immediacy and reliability. The control logic predefines linkage strategies for various stresses (e.g., temporarily lowering humidity settings to prevent condensation when temperature rises), and uses software algorithms to achieve synchronous and coordinated control of multiple stresses.

[0052] Safety protection and interlocking system (i.e., safety protection system): An independent safety module, including emergency stop circuits and various protective switches and sensors.

[0053] The aforementioned subsystems are integrated through a unified connection interface and framework structure. On the hardware side, the connection system links the environmental control, air conditioning room (if any), work chamber, and control system, enabling the flow of air, water, electricity, and signals. Interfaces utilize quick-connect couplings or flange connections; for example, air and water interfaces conform to ISO standard quick-connect couplings, while electrical interfaces use aviation plugs with sealing rings. All interfaces are clearly labeled and designed to prevent errors, supporting rapid replacement and combination of multiple modules. On the software side, each module registers with the central control system according to a unified communication protocol. Module additions or replacements can be identified through software configuration, achieving plug-and-play functionality. This modular interface design gives the platform high scalability and compatibility. Users can easily add new stress modules (such as vibration tables or pressure chambers) or change the work chamber size according to testing needs without making major modifications to the overall architecture. The configured interface documentation details the type, signal definition, and physical location of each interface, ensuring that engineers can correctly connect and operate the platform during setup and use.

[0054] A typical cyclic stress test flow includes initialization, stress cycling stages, and a termination stage. For example, a specific flow might include initialization, a heating phase, a high-stress holding phase (steady-state aging), a cooling phase, a low-stress holding phase, iterative cycling, and a recovery phase. In this flow, synchronous control of each stress is crucial. Synchronous control means that changes in different stresses are coordinated according to a set time sequence to avoid conflicts and simulate the real environment. For example, temperature and humidity often require coupled control, as do illumination and temperature synchronization, electrical stress and temperature cycling, and mechanical vibration synchronization. In practice, the control system automatically executes based on preset curve parameters, and the switching conditions for each stage can be triggered by time arrival or by the measurement parameters reaching a target.

[0055] Cyclic strategies refer to how test stress is repeatedly applied to accelerate cumulative damage. In this embodiment, cyclic strategies include, but are not limited to, constant stress aging, periodic cyclic stress, sequential stress combinations, progressively increasing stress, and random stress spectra. The choice of cyclic strategy depends on the test objective.

[0056] The following section provides a further explanation of multi-stress coupling and synchronous control.

[0057] A typical multi-stress synchronous control loop diagram of this embodiment is shown below. Figure 3 As shown in the figure, the superimposed data displays the cyclical changes of temperature (red line, in °C), humidity (blue line, relative humidity %), light intensity (orange dashed line, normalized %), wind speed (green dotted line, m / s, multiplied by 10), and water mist spray (cyan dotted line, on / off in %) over time. The 0–30 minute phase is a heating and drying stage, with the temperature rising from 25°C to 60°C, humidity decreasing from 50% to 30%, light intensity gradually increasing to 100%, wind speed approaching 0, and water mist shutting off. The 30–60 minute phase is a high-temperature, high-humidity steady state, with the temperature maintained at 60°C, humidity rising to 85%, light intensity maintained at 100%, and wind speed slightly increased. The 60–70 minute phase introduces a spray impact, maintaining a high temperature of approximately 55–60°C, activating water mist (blue line rises to 100%), rapidly approaching 100% humidity, while light intensity drops to 0 (simulating heavy rain and shading), and wind speed increases sharply (simulating strong winds). The 70–100 minute phase is a cooling and drying stage, with water mist stopping, wind speed maintained at a high level before gradually decreasing, temperature cooling from 55°C to 30°C, and humidity decreasing from 100% to 50%. This cycle can be repeated to achieve alternating superposition and synchronous control of multiple stress factors.

[0058] A key feature of this platform is its use of a coupled control strategy in the control system to coordinate the combined application of multiple stresses. Coupled control is mainly manifested in the following aspects: environmental coupling, employing linkage algorithms for control of strongly correlated environmental factors; and load coupling, where the heat generated by the electrical power load is coupled with temperature control. Safety coupling means that certain stresses cannot exist simultaneously or must be in a specific order for safety.

[0059] In this embodiment, signals from multiple safety sensors enter the threshold detection unit to determine whether preset limits (such as excessively high temperature or abnormal pressure) are exceeded. Once a monitoring condition triggers a fault signal, the fault state is maintained via latching and interlocking logic, and alarm and safety control signals are output. The alarm signal is used to alert the operator, while the interlocking control signal forces the relevant actuators into a safe state (such as shutdown or switching). A reset command input is used to clear the latch after the fault condition is eliminated, allowing the system to return to normal operation. When a reset operation occurs, the logic checks whether all safety conditions have returned to normal. Only when this is confirmed is the interlock released, ensuring that the equipment is not restarted prematurely before potential hazards are eliminated.

[0060] To achieve the aforementioned coupled control, a multi-stress collaborative control module was designed into the software architecture of the control system. Based on the current experimental mode, it treats each stress as a state vector and uses model prediction or rule-based control algorithms to adjust the output of each execution unit. For example, for temperature and humidity control, a bivariate PID controller with dew point constraints was established to automatically calculate a reasonable humidity target based on the temperature setpoint, maintaining the dew point below a certain threshold to prevent condensation. Similarly, for power-temperature joint control, by monitoring the sample temperature feedback, it dynamically allocates ambient heating and electrical power to achieve the target total heat input while also ensuring stability.

[0061] Synchronous control requires strict time synchronization and feedback closed loop. The data acquisition synchronization error of all sensors on this platform is within milliseconds, ensuring the controller obtains a consistent system state. The execution layer ensures the synchronous issuance of all control commands through a real-time operating system. For example, when multiple stress states need to be switched simultaneously (such as cyclically switching between turning off the light source and turning on the cooling system), the control system pre-schedules these actions and issues them within the same control cycle, thereby achieving near-simultaneous switching and avoiding stress overshoot or lag caused by asynchrony.

[0062] Using the above methods, this platform can achieve joint simulation and synchronous loading of multiple environmental factors, making accelerated aging more closely resemble the composite stress conditions in actual use, and the test results have more practical reference value.

[0063] This platform works in concert with a series of control strategy modules (environmental coupling, load coupling, safety interlocking, stress arbitration) and controlled subsystems (including temperature and humidity regulation, light irradiation, rain and water mist, salt spray corrosion, wind speed and airflow, power load, etc., as described above) to achieve precise control and coordination of various environmental factors.

[0064] The control strategy module will be explained in more detail below.

[0065] 1. Environmental Coupling Control Strategy The environmental coupling control strategy is responsible for coordinating and regulating the relationships between multiple environmental factors (such as temperature, humidity, light, rainfall, salt spray, and wind speed) to ensure that environmental stresses are applied synchronously or according to the set coupling method as required by the test. This includes sub-strategies such as temperature and humidity coupling, light-induced temperature rise feedback, rain and humidity-heat synergy, and salt spray-wind resistance. The following explanation uses temperature and humidity coupling as an example.

[0066] Temperature and humidity coupling Temperature and humidity control have a significant cross-influence relationship, requiring a coupling strategy for joint control. Temperature changes within the environmental test chamber affect relative humidity, and humidity fluctuations also cause temperature fluctuations. Therefore, this system employs a temperature and humidity coupled control algorithm to maintain high-precision constant temperature and humidity while improving stability through decoupling compensation and priority control. Specifically: Input variables include temperature sensor readings (e.g., cabin air temperature, blackboard temperature), humidity sensor readings (relative humidity %RH), and external environmental reference values. These are input to the controller as feedback sampling parameters.

[0067] Output variables include heater power commands, refrigeration valve opening commands, humidifier (e.g., steam humidifier) ​​power commands, dehumidifier commands, and fan airflow commands (affecting temperature and humidity uniformity). These control commands work together to regulate the temperature and humidity inside the cabin.

[0068] Control Algorithm: A dual-closed-loop PID control algorithm combined with feedforward compensation for temperature and humidity decoupling is employed. Temperature control is the master loop, and humidity control is the slave loop, with feedforward compensation based on temperature changes to correct the humidity setting. For example, when an increase in temperature will lead to a decrease in humidity, the humidification rate is increased in advance to compensate. Simultaneously, a fuzzy PID algorithm is introduced to self-adjust parameters based on the system state, improving response speed and stability under strongly coupled conditions.

[0069] Priority: Control is performed according to the principle of "temperature first, humidity second". When temperature and humidity targets conflict, priority is given to ensuring that the temperature reaches the set value, and then humidity is fine-tuned. For example, the temperature control error is limited to ±0.1℃, while humidity is allowed to fluctuate within ±1%RH to meet the temperature accuracy requirements.

[0070] Limiting Mechanism: Set safe ranges for temperature and humidity. For example, the maximum temperature can be set to 80℃, and the minimum temperature to -40℃; the maximum relative humidity can be 95%RH (to prevent condensation), and the minimum relative humidity to 20%RH (to prevent excessive dryness). The controller limits the output heating power and humidification capacity to prevent exceeding safe boundaries. If the temperature or humidity sensor value exceeds the limit, abnormal protection is triggered (such as pausing heating / humidification and triggering an alarm).

[0071] Abnormal Protection: Overshoot protection logic is added to the temperature and humidity system to prevent the temperature from exceeding the set value during rapid heating. When the temperature is detected to be approaching the upper limit and the rate of increase is too fast, the heating power is reduced in advance or the cold source is turned on to avoid overshoot. The humidity control also has an oversaturation protection function. If the humidity is close to 100%RH, humidification is suspended to prevent oversaturation and condensation.

[0072] Control effect: Through the above coupling strategy, temperature fluctuations can be controlled within ±0.3℃ and humidity uniformity within ±3%RH in the constant temperature and humidity test chamber. Practical experience has shown that in harsh environments such as -55℃ to +120℃ and 95%RH, this algorithm can accurately and stably maintain the set values, suppressing overshoot and fluctuations caused by the interaction of temperature and humidity.

[0073] 2. Load Coupling Control Strategy Load-coupled control strategy refers to a method for controlling the power consumption and heat generation of the device under test (DUT) in conjunction with the ambient thermal field. Many reliability tests require the DUT to withstand environmental stress while powered on. In this situation, the device's own heat generation affects the ambient temperature field, and similarly, changes in ambient temperature affect the device's heat dissipation. Therefore, it is necessary to introduce the load (electrical power consumption) into the control loop and couple it with the environmental control to prevent local temperature runaway and simulate real operating conditions.

[0074] Device power consumption, heat generation, and thermal field control are linked. Input variables include: the power setting or operating mode of the device under test (e.g., on / off cycle, current magnitude), temperature sensor readings of key components of the device (e.g., chip junction temperature T_j, case temperature T_case), device power consumption measurements (voltage and current sensor feedback), and ambient temperature inside the chamber. For simultaneous testing of multiple devices, the temperature rise status of each device also needs to be obtained.

[0075] Output variables: power supply voltage / current commands applied to the DUT (to control its power dissipation), load module cooling power commands (if there is an independent cold plate or air cooling for controlling device temperature), and dynamic correction values ​​for ambient temperature settings.

[0076] Multi-loop control: This system employs a multi-loop temperature control strategy: in addition to the ambient temperature control loop, a local temperature control loop is added for each critical component. That is, each DUT (Device Under Test) is assigned a temperature control point (usually selected at the hottest part, such as a chip or power module), and the temperature feedback from this point adjusts the applied power or local cooling device of that DUT. The ambient temperature control system serves as background regulation, providing a basic temperature field. This dual-layer control of primary ambient temperature control and secondary local temperature control solves the problem that a single path cannot adequately control the temperature of all components.

[0077] Coupling and Coordination: When the DUT itself generates heat and its temperature rises too quickly, the controller can automatically reduce its power supply (e.g., reduce current) to prevent the junction temperature from exceeding the safe limit, while simultaneously notifying the environmental control system to lower the ambient air temperature or increase the fan speed to assist in cooling. Conversely, when it is necessary to accelerate the heating of the DUT to a certain temperature (e.g., power cycling tests require a rapid increase in junction temperature), the environmental heating system and the device's own power supply work together: on the one hand, the environmental chamber heats up, and on the other hand, the device's power consumption increases, generating heat. The combination of these two factors achieves a faster heating rate than either the environment alone or the load alone.

[0078] Priority control: In stress arbitration, priority is usually given to preventing overheating damage to devices, followed by strictly adhering to the ambient temperature profile. This means that if a conflict arises (e.g., the ambient temperature should be raised to 125°C according to the environmental program, but the junction temperature of the device is already close to the reliability limit under full load operation), derating measures are taken: reducing device power consumption or lowering the ambient temperature setting until the device temperature is within a safe range. This strategy is particularly important in the testing of power semiconductors and high-density electronic components, as it can effectively prevent unexpected failures caused by localized overheating. In practice, there have been instances where, under a single environmental control mode, the temperature of large-size devices has just reached the standard while the temperature of small-size devices has already severely exceeded the limit; by adopting this strategy, through branched control, the temperature of small devices is also kept within the allowable range, achieving a balanced stress on all devices.

[0079] Limiting protection: To protect the device under test (DUT), the system sets a safe upper limit for its junction temperature (e.g., 125°C or according to the device specification). Once the device temperature exceeds the threshold, its power supply is immediately cut off or reduced, and the chamber cooling is activated, even if this may cause the ambient temperature to temporarily deviate from the test curve, prioritizing safety. In addition, overcurrent and overvoltage protection are provided to prevent electrical stress damage to the sample due to control failures. The environmental chamber also has a set lower temperature limit. When the DUT's active cooling causes the chamber temperature to fall below a certain value (e.g., high power leading to excessive ambient cooling), exhaust ventilation can be reduced or cooling can be lowered to avoid condensation due to excessively low ambient temperatures.

[0080] Control Flow Description: In summary, within each control cycle, the system first reads the temperatures and power consumption of all DUTs; then it calculates the power adjustment command for each DUT (based on the error between its target temperature and the current temperature, such as simple PID or lookup table control); simultaneously, it reads the cabin temperature and compares it with the target ambient temperature to obtain the ambient heating / cooling command; next, it checks arbitration: if a DUT's temperature exceeds the limit, its power is reduced and ambient cooling is prioritized; if the ambient temperature is not up to standard but the DUT temperature is very low, its power consumption can be increased to assist in heating. After arbitration, all outputs are executed and data is recorded. This closed-loop operation continues.

[0081] Example: In power cycling tests, devices are repeatedly switched on and off to generate self-heating and cooling, achieving cyclical changes in junction temperature. Assume the junction temperature needs to cycle between 25°C and 125°C. Traditional methods only control the ambient temperature, which may lead to inaccurate junction temperature control. This system, however, adjusts the device's power consumption in real time, causing it to heat up as needed, while simultaneously adjusting the ambient chamber temperature to assist in heat dissipation or insulation. This precisely controls the junction temperature within its upper and lower limits and achieves the specified rate of rise and fall. This satisfies the test specifications while protecting the device from overheating or underheating due to a single, uncontrollable factor.

[0082] 3. Safety interlocking (i.e., safety monitoring and interlocking strategies) Reliability testing equipment faces numerous safety risks when operating under multi-stress conditions, such as high-temperature and high-pressure equipment, strong light exposure, coexistence of water and electricity, and corrosive media. Therefore, the system is designed with a series of safety monitoring and interlocking strategies. Through hardware interlocks and software logic, it ensures automatic shutdown or state switching under unsafe conditions, preventing personnel injury or equipment damage. Several key interlocking strategies are listed below: light exposure + water spray interlock (mainly including interlock rules, interlock release, status monitoring, cooling linkage, etc.), access control + high-pressure interlock (mainly including implementation mechanism, delay and prompts, door lock mechanism, high-pressure interlock range, etc.), and salt spray + fan logic (mainly including leak prevention mode, corrosion-resistant fan, step interlock, cleaning and protection, etc.).

[0083] This section provides a detailed explanation of the light + water spray interlock, as follows: Illumination + Water Spray Interlock: When the experiment involves two stresses—intense illumination (such as xenon lamp solar simulation) and water spray (rain)—the risks of direct interaction between the two must be considered: sudden cooling or heating may cause the lamp cover or heating element to crack, and water mist may cause electrical short circuits in the light source. Therefore, this system is equipped with an "illumination-water spray interlock" mechanism. Interlocking rules: By default, simultaneous activation of high-intensity lighting and water spray is prohibited. In other words, when the rain / water mist module is activated, if the lighting module is already running, it will immediately shut down or reduce to a safe level; conversely, the rain function must not be activated while the lighting is on, unless specific measures have been taken. This interlock can be implemented either through software (the controller detects one is activated and blocks the command for the other) or through a hard-wired safety circuit for double protection.

[0084] Interlock Deactivation: If the test requires simultaneous illumination and rain (e.g., simulating a sudden downpour under sunlight), a special deactivation mode is needed. This typically requires: 1) waterproof luminaires or protective covers; 2) water spray angles that avoid direct contact with the luminaires; and 3) light intensity reduced to a safe level. For example, some aging test equipment allows the spraying of pure water during light circulation to impact materials, provided the lamps are made of quartz glass and heated to a stable temperature to prevent them from shattering due to water droplets. Simultaneously, the software must strictly control the duration and interval of the spray according to the program to avoid prolonged continuous spraying.

[0085] Status Monitoring: The system continuously monitors the lamp temperature and the presence of water pressure within the cavity. If an abnormal drop in the lighting module temperature is detected (suspected water ingress) or a water leak is detected, the light source is immediately shut off and an alarm is triggered. Similarly, the water pump is not allowed to build up pressure until the lighting has completely extinguished and cooled down. This is achieved by adding an interlock relay between the light source power supply and the water pump circuit: the water pump circuit is cut off when the light source is powered on, and the interlock is released to allow water to spray only after the light source is confirmed to be off.

[0086] Cooling linkage: The lighting-spray interlock also includes cooling linkage logic. When the spray is about to start, the system can reduce the light source power or add baffles to allow the lamp assembly temperature to drop slightly to prevent drastic temperature differences. After the spray ends, the lighting output is restored after a certain delay. This sequential control minimizes thermal stress and equipment risks.

[0087] The logic for access control + high-voltage interlock and salt spray + fan is only briefly explained.

[0088] Access Control + High-Voltage Interlock: Environmental testing equipment typically contains high-voltage components such as high-temperature furnace tubes, powerful electric heaters, compressors, and power supplies. To ensure personnel safety, the system is designed with an access control-high-voltage interlock: when the test chamber door is opened or not properly closed, all high-voltage and hazardous components are immediately de-energized and the machine stops.

[0089] Salt spray + fan logic: Salt spray corrosion tests involve corrosive media, and their safety interlocks focus on airflow control and isolation. Salt spray test chambers typically require good sealing to prevent salt spray leakage, and thorough exhaust ventilation is necessary after the test to remove any residual corrosive gases.

[0090] 4. Stress Priority Arbitration Strategy When multiple stress factors are applied simultaneously, conflicts and couplings inevitably occur. The stress priority arbitration strategy is used during testing to coordinate conflicting control commands according to predefined priority rules, determining which stress should be prioritized and how the others should yield or switch. This strategy includes stress matrix definition, conflict control priority, and default switching strategy.

[0091] Stress matrix definition: First, the system establishes a stress matrix to formally describe the interaction relationships between various stress sources. The rows and columns of the matrix correspond to the main environmental stress categories, such as: temperature (T), humidity (H), illumination (L), rain (R), salt spray (S), wind speed (W), and load power consumption (P), etc. Elements in the matrix can represent the degree of conflict or cooperation, as well as the arbitration priority.

[0092] An example conflict matrix (simplified representation) of this embodiment is as follows:

[0093] In the table: "Conflict" indicates that two stresses are unlikely to reach their respective extreme values ​​simultaneously, requiring a compromise; "Cooperation" indicates that one stress helps the other achieve its value; "Coupling" indicates that there is an interactive effect requiring joint control; "Cannot be performed simultaneously" indicates that this system prohibits the simultaneous application of this combination. The above matrix is ​​a logical illustration; in the actual system, more refined parameter and relationship definitions are stored in the configuration database. The controller consults this stress matrix during runtime to evaluate the degree of conflict of each stress combination under the current test conditions in real time.

[0094] Conflict control priority Based on the stress matrix, the system defines control priorities for each potential conflict. Priorities reflect which stresses (or control variables) should be prioritized to reach the setpoint under conflict conditions, and which stresses require concession adjustments.

[0095] Default Priority Table: Unless otherwise specified, this system adopts the following default priority order (from high to low): Temperature / Safety > Humidity > Salt Spray > Light Exposure > Rain > Wind Speed ​​> Load Power Consumption. This means that when resource contention occurs, such as temperature control conflicting with other controls, temperature takes priority; humidity conflicts with light exposure, humidity takes priority, and so on. This order is based on experience: temperature and humidity stresses usually have the greatest impact on products and are difficult to adjust instantaneously, so they should be prioritized. Salt spray is an uninterrupted chemical cumulative stress, and is also given a high priority. Light exposure, rain, and wind can be partially compensated for by changing the timing, so their priority is relatively lower. Load power consumption can be flexibly controlled and can be adjusted or interrupted when necessary, so it has the lowest priority.

[0096] Dynamic Arbitration: Furthermore, the system possesses dynamic arbitration capabilities, allowing for adjustments to priorities based on real-time conditions. For example, if it's found that illumination has little impact on temperature at a certain stage, illumination intensity can be temporarily prioritized to maintain experimental continuity. Dynamic arbitration is typically achieved through weighted coefficient calculations, i.e., calculating the importance of each control variable based on factors such as error and rate of change, and then adjusting the output proportionally.

[0097] This embodiment also provides a unified priority system (covering all conflicts), as detailed below: P0 Safety / Protection Category (Highest): Personal safety, access control, emergency stop, over-temperature / over-current / leakage, equipment self-protection (including DUT over-temperature derating / power failure, light source cooling failure shutdown, salt spray leakage valve closure). P1 Mandatory Standard / Regulatory Limits: Hard limits specified in standards (e.g., lower limit for salt spray deposition rate, upper limit for gas concentration). P2 Test "Primary Stress": Stress marked as Primary in the test configuration (can be temperature, salt spray, or light exposure, etc.). P3 Constrained Environmental Quantities: Temperature / humidity under dew point constraints, blackboard temperature constraints on light exposure, etc. P4 Secondary Stress: Other environmental stresses not marked as primary stresses (light, rain, wind, etc.). P5 Energy Consumption / Efficiency Optimization: Energy saving and comfort scheduling. Decision-Making Rules: Decisions are made from highest to lowest P0 to P5; dynamic weights (error, rate of change, expected completion time) are only allowed within the same level to determine the concession range.

[0098] This embodiment also provides a definition of concurrency / interlock levels, as follows: M0 Hard Interlock Prevents Concurrency: Physically / safely prohibits concurrency (e.g., salt spray). Strong wind, door open High pressure / light source). M1 Conditional Concurrency: Must meet protective gear / dilution / time staggering requirements (e.g., light + fine mist, lamp power ≤ X%, avoidance of light spray, and cooling redundancy). M2 Sequential Stage: Can only be rotated according to the programmed time sequence (e.g., salt spray → air drying, rain shower → maintaining stuffiness). M3 Free Concurrency: Can coexist in a closed loop (e.g., temperature / humidity coupling, temperature / air concurrent). In the table, "Cannot be performed simultaneously" = M0; "Interlock / Sequence" should be specifically marked as M0 or M2; "Conflict (concession)" = M1 / M3 depending on the limiting strategy.

[0099] Default switching strategy The default switching strategy defines the actions and transition processes the system should take when stresses need to be applied alternately or when conflicting switching occurs. Its goal is to smoothly switch between different stress modes, avoiding abrupt transitions that could lead to test interruptions or unwanted impacts on the sample.

[0100] Timing Switching: For stress combinations that cannot be performed simultaneously, the execution order and condition thresholds are preset. For example, "high temperature first, then salt spray" is the sequence used in many comprehensive tests: first, the sample is heated to a specified temperature (e.g., 50℃), then cooled to a lower temperature (e.g., 20℃) before salt spraying. This system defaults to following this strategy: it specifies that in material aging and salt spray coupled tests, aging (e.g., light exposure) should be performed when the temperature reaches 50±3℃, and salt spraying should only begin when the temperature drops to 20±3℃. This avoids rapid salt drying or abnormal reactions at high temperatures and protects the equipment. When repeated cycles are required, the sequence of heating—constant temperature aging—cooling—salt spraying must be strictly followed and cannot be reversed.

[0101] Smooth transitions: When switching between certain continuous variables (such as temperature and humidity), a gradual ramp is used instead of an abrupt change. For example, when switching from high temperature to low temperature, the system controls the cooling rate to not exceed a certain limit (to prevent thermal shock cracking of the sample); when switching from dry to rainy conditions, the system increases the humidity in advance to make the environment closer to the transition when switching to rain, and so on. The control software inserts a transition state during mode switching and calculates the target curve through interpolation to avoid sudden jumps in the controller output.

[0102] Conflict Resolution: When a conflict condition disappears or is resolved, there is a default recovery strategy. For example, if the light source is turned off when the light-water spray interlock is triggered, the system will wait a safe period (e.g., 30 seconds) after the water spray ends before automatically relighting the light source, gradually increasing the intensity from a lower level to the set level to prevent thermal shock to the lamp. Similarly, if the test is paused and the high voltage is cut off due to a door opening, after the door is closed again and the continue button is pressed, the system will not immediately jump back to the previous high-stress state. Instead, it will first restore to a safe steady state (e.g., room temperature, equipment standby), and then choose to continue or restart the current stage according to the test schedule. This ensures that if personnel open the door to adjust the sample, the system will not encounter an immediate extreme environmental change after closing the door again.

[0103] Abnormal Switching: If a stress is forced to stop due to a malfunction or manual intervention, the system's default emergency strategy is to enter a safe mode, i.e., shut down or reduce other stresses to the baseline level and await further instructions. For example, in a combined high-temperature, high-humidity, and vibration test, if the vibration table malfunctions and stops, the environmental system should also be reduced to a normal temperature and humidity standby state to prevent the continuous action of a single stress from exceeding the planned limits. If the test needs to continue, the conditions can be reloaded according to the recorded interruption point after repair. The system's software implementation will capture any abnormal events in the subsystems, triggering a mode switch in the global state machine, prioritizing a switch to safe / standby mode, and then notifying the operators.

[0104] Automatic / Manual Intervention: The default switching strategy can be configured by the user to perform automatically or require manual confirmation. For general procedural switching (such as alternating phases in a loop), the system executes automatically. However, for switching involving safety or exceeding requirements (such as abnormal recovery or skipping a phase), the system usually pauses and waits for manual confirmation to ensure that experimenters are aware of the change. Users can also customize the recovery logic for certain interlocking conditions, such as manually disengaging the light-water spray interlock to conduct specific experiments. In this case, the system will display a warning and require manual approval before execution.

[0105] The default switching strategy in this embodiment also includes a "slope / lag" value, as follows: Temperature / humidity / light intensity / wind speed slope: ≤5°C / min, ≤10%RH / min, ≤10%P_lamp / s, ≤1 m / s / s.

[0106] "Light → Rain" / "Rain → Light" lag: ≥30 s (lamp or cavity cooling / drainage).

[0107] "Salt spray → air drying" lag: ≥60 s (drying after settling is complete).

[0108] The "door closed → power on" delay is ≥2 seconds, and the safety chain is fully closed.

[0109] In summary, the stress priority arbitration strategy makes the control of multi-stress environment tests more intelligent. Under various stress coupling conditions, the system can automatically determine the appropriate actions based on pre-defined matrices and rules, adjusting the priority order of control commands or switching steps when necessary to ensure both compliance with test specifications and the protection of safety and equipment lifespan. The arbitration strategy, together with the aforementioned specific control strategies, forms a complete control decision network.

[0110] The aforementioned multi-environment accelerated aging test platform for power electronic modules is suitable for accelerated reliability and life assessment of power electronic modules (such as IGBT / IPM power modules, MOSFET modules, etc.) and their internal key components (capacitors, inductors, power semiconductor chips, connectors, etc.). By reproducing extreme environmental conditions in the laboratory, such as outdoor or industrial environments (e.g., temperature range -40℃ to +125℃, humidity 10% to 98%RH, solar irradiance AM1.5 standard spectrum 1000W / m², electromagnetic interference 10V / m, etc.), the test object undergoes stress accumulation equivalent to long-term service in a short period of time. This allows for the identification of design weaknesses, assessment of life indicators, and verification of its adaptability in multi-stress coupling environments.

[0111] This testing platform is applicable to new energy power generation (power devices in wind / photovoltaic inverters), electric vehicle power modules, industrial frequency converters, power electronic converters, and other electronic power devices that need to withstand complex environmental conditions. The platform can be used for design life verification of new products, stress testing in failure analysis, and also supports consistency screening and quality control of batch devices.

[0112] One embodiment of this application also provides a multi-environment accelerated aging test method for power electronic modules. Based on the multi-environment accelerated aging test platform for power electronic modules as described above, the method includes: configuring test parameters and setting stress curves for temperature, humidity, light, wind speed, rain, and salt spray; initiating multi-stress synchronous loading and applying multi-environment stresses synchronously or sequentially according to a predetermined process; collecting environmental parameters in real time and monitoring the performance parameters of the device under test in real time to obtain performance degradation data; calculating the acceleration factor and predicting lifetime based on the environmental parameters, the performance parameters of the device under test, the performance degradation data, and the acceleration model; determining failure based on predefined failure criteria and recording lifetime data.

[0113] In some preferred embodiments, the method further includes an adaptability verification process: verification by comparing data with actual environmental conditions; post-test sample function checks; failure mode analysis confirmation; and repeated verification of platform stability. The adaptability verification process is a continuous process throughout the platform's lifecycle. Before testing, there is a scheme review (ensuring reasonable condition settings); during testing, there is monitoring and comparison (e.g., the conformity between temperature and humidity curves and design curves); after testing, there is data and mechanism comparison. The platform and testing methods are continuously improved based on the verification results. For example, if a verification finds the test to be too conservative (insufficient acceleration) or too aggressive (resulting in abnormal failures), feedback will be provided to adjust the parameters for the next test.

[0114] An embodiment of this application also provides a reliability assessment system for power electronic modules, including a multi-environment accelerated aging test platform for power electronic modules as described above, and: a reliability database for storing historical test data and failure cases; and a report generation module for automatically generating test reports and life assessment conclusions. The remote monitoring interface supports simultaneous access and data analysis by multiple users.

[0115] To make the experimental platform and its application in this application clearer, a typical application example is provided below.

[0116] This solution addresses typical on-site operating conditions of integrated hydro-wind-solar power plants, simulating various environmental stresses to accelerate the aging of electronic power modules and their key components. The testing plan covers target devices and environment, aging stress combinations and test cycles, stress loading curves, control strategies, data acquisition, and lifetime estimation methods, as detailed below: 1. Test target device type and typical operating environment Target device types: Key components in the inverter module, including DC link capacitors (such as film capacitors or electrolytic capacitors), high-current connectors (cable connection terminals, plugs, etc.), control unit MCU (microcontroller chip and its board-level circuitry), and various analog signal sensors (such as temperature sensors, voltage / current sensors, etc.). These components constitute the core of the inverter and control system of new energy power plants.

[0117] Typical operating environment: Outdoor open-air hydro-wind-solar integrated renewable energy power station environment. Under this condition, electronic components are subjected to the combined effects of multiple environmental stresses, including temperature, humidity, solar radiation, and wind force, which may lead to performance drift, corrosion, and aging. Therefore, it is necessary to reproduce the combined stress effects of the above typical environmental factors on the components in the laboratory to assess their long-term reliability.

[0118] 2. Stress combination and testing cycle for aging targets Stress Combination Objectives: The environmental stresses applied in this accelerated aging test include: temperature cycling stress (simulating thermal shock and cycling caused by drastic diurnal temperature changes, with stress amplitude covering the upper limit of the normal operating temperature range, such as high temperature to ~85℃ and low temperature to ~25℃ or lower), humidity cycling stress (simulating alternating high humidity and low temperature condensation, with humidity cycling between 50%RH and 95%RH, including condensation conditions), solar radiation stress (simulating sunlight, with peak light intensity reaching 1 kW / m² full-spectrum irradiation, including UV components, accelerating material aging), wind stress (simulating changes in on-site wind speed, convection cooling, and mechanical loads, with peak stress wind speeds such as airflow impacts on the order of 10 m / s), and condensation / water mist stress (simulating dew and water mist at night or in the early morning, causing condensation films on the component surface). If necessary, operating electrical stresses (such as applying rated DC voltage to capacitors, powering on the MCU, and applying power signals to sensors) can be superimposed to more realistically reproduce the stresses experienced by components under energized operating conditions.

[0119] Test Cycle: A comprehensive stress spectrum is set with a 24-hour cycle, and the load is repeatedly applied for several cycles to accelerate aging. A typical scheme involves continuous operation for 60 24-hour cycles (approximately two months of continuous testing) to simulate the environmental stress accumulated over many years in the field. Each 24-hour cycle completes a full cycle of temperature / humidity / light / wind / condensation alternation. The total number of cycles and stress amplitude can be adjusted according to the acceleration factor requirements: for example, increasing the temperature of the high-temperature phase or extending the high-humidity period to increase aging stress, or shortening the cycle period as needed (e.g., compressing the actual 24-hour variation into 12 hours) to further increase the acceleration factor. The total test duration and number of cycles should cause measurable degradation in the performance parameters of critical components, allowing for lifespan estimation. For general electronic device reliability verification, a high-temperature, high-humidity stress condition of 85°C / 85%RH for 1000 hours is equivalent to several years of natural aging. This scheme, through the synergistic effect of multiple stresses, can accelerate the exposure of potential device failure modes in a shorter time.

[0120] 3. Description of stress loading curves The following are examples of the variation curves of various environmental stress factors during a typical 24-hour stress loading cycle: Temperature and humidity cycle: Temperature and relative humidity change in a diurnal cycle. In the early morning, the ambient temperature is initially low, around 25°C, and the relative humidity is close to saturation (90%RH–95%RH). At this time, the dew point may be close to the ambient temperature. As the "daytime" phase begins, the temperature gradually rises after sunrise, climbing to its midday peak (e.g., 80–85°C) within approximately 4–6 hours. The relative humidity decreases relative to the temperature rise (RH decreases while maintaining constant absolute humidity, e.g., to around 50%RH). Alternatively, depending on the testing requirements, the absolute humidity can be increased simultaneously during the temperature rise, achieving both high temperature and high humidity at midday (e.g., stringent conditions of 85°C / 85%RH). After midday, the afternoon cooling phase begins, with the temperature slowly decreasing from its peak, falling back to around 30°C at sunset, and then further decreasing to its lowest temperature at night (25°C or lower can be set to increase the diurnal temperature range). Humidity rises rapidly in the evening as the temperature drops, maintaining a high humidity state at night (relative humidity approaches 95%RH again). During the nighttime hours when temperatures are low and humidity are high, when the ambient temperature is below the dew point, water vapor in the air will condense on the surface of the device to form a water film, which is called condensation.

[0121] Light Rhythm: An artificial light source (such as a full-spectrum xenon lamp or LED solar simulator) is used to simulate the solar cycle. The light intensity curve is synchronized with temperature changes: Illumination begins at sunrise, with light intensity gradually increasing from 0; reaching perceptible light around 6-8 AM, then linearly or gradually increasing to peak intensity around noon (typically set at 0.8-1.0 kW / m² irradiance, close to midday sunlight intensity). High-intensity illumination at noon is maintained for several hours (e.g., 4 hours of peak maintenance), after which the light intensity gradually decreases from 2-3 PM, reaching zero by sunset. Daily light duration can be set to 12-14 hours of daylight (corresponding to daytime), with the remaining time being darkness. The light spectrum includes ultraviolet components to accelerate the photoaging of device packaging materials and sensor elements. The switching on and off of illumination and intensity changes should be coordinated with the rise and fall of the temperature curve to achieve synchronized changes from sunrise to sunset.

[0122] Wind speed curve: A programmable fan is used to simulate changes in on-site wind force. Wind speed varies in stages throughout the day: lower wind speeds or intermittent light breezes (e.g., slight airflow of 0-1 m / s) are set in the early morning and at night to avoid excessive dryness at night affecting condensation formation; higher wind speeds are introduced during the day, especially around noon, to simulate strong winds that may occur at noon and in the afternoon (e.g., peak wind speeds of around 8-10 m / s). Wind speed can vary according to a sine or trapezoidal curve: wind speed gradually increases in the morning and remains high at noon, fluctuates slightly in the afternoon (gusts can be introduced to simulate transient wind speed changes, for example, by superimposing a random 5%-10% fluctuation on the peak wind speed), and decreases to the low level of the night in the evening. The effect of wind is twofold: on the one hand, it enhances convective heat transfer, making temperature circulation more intense; on the other hand, it applies slight mechanical vibration stress to components (especially connectors, circuit boards, etc.), which can induce contact loosening or material fatigue in the long term.

[0123] Condensation / Water Mist Triggering Conditions: When the environment enters the nighttime low-temperature, high-humidity phase and the temperature drops close to the dew point, condensation simulation control is activated. When the relative humidity is ≥95%RH and the temperature drops to near the dew point (e.g., below 25°C, a drop of more than 30°C from the daytime peak temperature), water mist injection is triggered via a spray humidifier. During a sudden temperature drop (e.g., in the evening), fine water mist is sprayed or the air humidity is increased to saturation using an ultrasonic humidifier, causing dew and a water film to quickly form on the surface of the sample. Water mist triggering is generally maintained for 0.5–1 hour** to ensure uniform moisture on the device surface. Afterward, the environmental chamber is kept sealed, allowing the condensate film to remain on the sample surface for several hours (simulating prolonged dew adhesion). As the temperature rises again in the morning, the condensate will gradually evaporate, completing one condensation-drying cycle. This process reproduces the repeated stress of equipment being exposed to moisture outdoors at night and then evaporating and drying in the morning, which is crucial for evaluating connector contact corrosion, PCB creepage, and capacitor sealing reliability.

[0124] (The above curve parameters can be adjusted based on actual station environmental data to closely approximate typical meteorological conditions. For example, the sunshine and temperature curves for sunny summer days, wind distribution, and the climate characteristics of large temperature differences between day and night in mountainous areas.) 4. Control strategy, data acquisition, and lifespan estimation Control Strategy: The entire experiment is coordinated by a programmable environmental control system that uniformly manages the loading timing and intensity of each stress source. A phased control approach divides the 24-hour cycle into multiple phases (e.g., "early morning phase," "daytime heating phase," "noon high temperature phase," "afternoon cooling phase," "nighttime condensation phase," etc.), with pre-set target temperature, humidity, light intensity, and wind speed curves for each phase. The control system adjusts the heater, cooling unit, humidifier / dehumidifier, light source brightness, and fan speed based on real-time sensor feedback, ensuring that each physical quantity changes synchronously according to the curves. Synchronous triggering conditions are also set: for example, when the temperature rises to a threshold, the light source brightness is increased; when the temperature drops to the dew point, water mist spraying is triggered, etc., so that the changes in various stress factors coordinate with each other, realistically reproducing the coordinated changes in the natural environment. If electrical stress is also applied to components during the experiment, the control strategy includes coordinating the work cycle, such as the MCU power-on self-test running during the highest temperature period of the day, or sensors periodically collecting signals to observe the functional status under high stress. All stage transitions are executed automatically by a PLC / industrial computer and have safety protection logic (such as preventing temperature overshoot and avoiding irreversible damage to test samples caused by simultaneous ultra-high temperature and supersaturated humidity). During the entire cycle, the control system can also adjust parameters as needed (such as gradually increasing wind speed or extending the duration of high temperature) to achieve a stepwise increase in stress and accelerate the aging process.

[0125] Data Acquisition Parameters: The test platform is equipped with comprehensive sensing and measurement devices to monitor and record environmental conditions and component response parameters in real time. Environmental data acquisition includes: cabin air temperature, relative humidity, light intensity (W / m²), wind speed and direction, and dew point temperature. In addition, sensors are placed on the key components under test to directly measure their stress state, such as capacitor casing / internal temperature, typical component surface temperature, and connector temperature (to assess heat generation during operation), to obtain the temperature difference between the component and the environment. On the component performance parameter acquisition side, periodic measurements are performed on different devices: capacitors are periodically measured for changes in their equivalent series resistance (ESR), capacitance, and loss tangent (tanδ) to assess dielectric aging and increased losses; connectors are measured for contact resistance (using a micro-ohmmeter to measure voltage drop under rated current) and the contact areas are inspected for signs of oxides or corrosion; MCUs are monitored for operating current, core temperature (if a sensor is present), and functional status (e.g., self-test results, communication status) to capture the effects of potential thermal stress or moisture on electronic circuits; analog sensors are periodically calibrated for their outputs (e.g., resistance / voltage output of a temperature sensor) to observe zero-point drift or sensitivity changes. All data is automatically acquired and recorded at a certain frequency (with an appropriately increased sampling frequency during critical stress change periods) and stored in the data logging system for subsequent analysis.

[0126] Lifetime estimation method: After the test, lifetime assessment is performed based on the data curves of performance degradation of key components and failure criteria. First, aging criteria are defined for each component. For example, a 20% decrease in capacitance or a doubling of the loss angle is considered reaching the end of life; connector contact resistance exceeding a specified upper limit (e.g., several times the initial value) is considered failure; sensor output drift exceeding tolerance, etc. In accelerated aging tests, the cumulative stress time or number of cycles experienced by the component to reach the failure criteria is measured, and then the actual lifespan is calculated by combining the acceleration factor. The acceleration factor can be calculated based on classic reliability models: for thermal stress-dominated aging (e.g., capacitor dielectric aging), the Arrhenius model is used to calculate the lifespan reduction factor caused by temperature increase; for failures caused by the combined effects of temperature and humidity (e.g., circuit board moisture absorption, connector corrosion), the Peck model or its extended formula is used to consider the combined accelerating effect of temperature and humidity; for mechanical fatigue failures caused by thermal cycling (e.g., solder joint cracking), the Coffin-Manson model is used to estimate lifespan loss based on the temperature cycle amplitude and frequency. These models convert the high-stress conditions (t hours / cycles) in the experiment into equivalent lifespans under normal operating conditions. For example, calculations using the Arrhenius and Peck models show that operating for 1000 hours under stress conditions of 85℃ and 85%RH is equivalent to over 200,000 hours (approximately 22 years) of aging for the device in an environment of 25℃ and 60%RH. Based on the data from each component, the report provides predicted lifespans and analyses of major failure modes under typical conditions in actual power plants, allowing for optimization of design and maintenance strategies. Ultimately, this experimental scheme, through multi-source coordinated stress accelerated testing, provides a scientific basis for evaluating the long-term reliability of key inverter components in integrated hydro-wind-solar power plants.

[0127] In summary, this application possesses at least the following characteristics: 1. Provide a multi-environmental stress collaborative simulation method: Within a single sealed test platform, through the combination of multiple sub-modules such as temperature and humidity regulation, light irradiation, wind speed impact, rain and water mist, and salt spray / corrosive gases, the method achieves precise synchronous application and dynamic switching of various environmental stresses, including water, wind, light, and salt spray. Environmental coupling control strategies (such as temperature and humidity coupling, light irradiation feedback, rain and humidity synergy, and salt spray and wind flow countermeasures) are introduced to ensure that environmental conditions reproduce the complex operating conditions of real new energy power plants.

[0128] 2. Employing a load-environment bidirectional regulation mechanism: An integrated power control / temperature rise feedback module for the device under test (DUT) can apply programmable electrical stress (constant voltage, constant current, constant power, or constant junction temperature control) to the DUT's power electronics module and collect its power consumption and junction temperature changes in real time. Based on the real-time operating status of the DUT, the environmental stress level is adjusted in reverse (e.g., by raising or lowering ambient temperature, adjusting wind speed, or adjusting illumination), forming a closed-loop linkage between the load and the environment, accelerating the exposure of failure modes under actual service conditions.

[0129] 3. Establish a stress priority arbitration and safety interlocking system: Establish a stress priority matrix and concurrent interlocking rules to achieve automatic arbitration and resource allocation in the event of multiple stress conflicts. The safety interlocking mechanism covers interlocking between light and water spray, salt spray and fan, and access control and high voltage, ensuring the safety of personnel and equipment during the test and preventing unexpected stress superposition.

[0130] 4. Ensures accurate stress switching transition and control: Smooth transition control (slope limiting, hysteresis protection, etc.) is adopted during stress switching to avoid unexpected damage or distortion of test results caused by transient impacts. Each stress source has a limiting mechanism and real-time feedback closed loop (such as maximum light intensity, upper humidity limit, wind speed range, salt spray concentration, etc.) to ensure control accuracy and long-term operational stability.

[0131] 5. Modular Architecture and Scalability: The software architecture adopts a modular design, including a task scheduling module, control logic module, data acquisition module, and anomaly detection module, supporting flexible expansion to new stress sources or test modes. It provides configurable test templates and parameter structures, facilitating rapid deployment of test solutions for different product types and standards.

[0132] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Parts not mentioned in the above embodiments are the same as or can be implemented using existing technology, and will not be further described here.

[0133] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A multi-environment accelerated aging test platform for power electronic modules, characterized in that, The platform includes: A closed environment chamber is used to provide a closed testing environment; The environmental stress simulation system includes a temperature and humidity control module, a light irradiation module, a wind speed impact module, a rain and water mist module, and a salt spray / corrosive gas module, which are used to simulate the effects of various environmental stresses in the operating environment of power electronic modules. An electrical stress loading system includes a power control and temperature rise feedback module for the device under test, used to apply working electrical stress, perform real-time monitoring and feedback, and realize the linkage between the load and the environment; The central control and data processing unit is connected to the environmental stress simulation system and the electrical stress loading system to realize the synchronous loading, dynamic switching and real-time monitoring of multiple environmental stresses.

2. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The temperature and humidity control module includes a cooling unit, a heating unit, a humidification unit, and a dehumidification unit, and is equipped with a temperature and humidity sensor; The central control and data processing unit performs temperature and humidity coupled control, and adjusts the heating power, cooling capacity, humidification capacity and dehumidification capacity in a coordinated manner based on temperature and humidity feedback signals to achieve decoupled compensation control of temperature and humidity.

3. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The light irradiation module includes an adjustable light source, a light intensity sensor, and a blackboard temperature sensor; The central control and data processing unit adjusts the light source power and ambient cooling based on the light intensity and blackboard temperature feedback signals to control the light intensity and limit the temperature rise caused by the light.

4. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The wind speed impact module includes an adjustable speed fan and a wind speed sensor; The central control and data processing unit controls the speed of the adjustable fan according to the set wind speed curve, and forms an adversarial control or cooperative control mode with the salt spray / corrosive gas module.

5. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The rain mist module includes a water tank, a water pump, spray pipes, and a solenoid valve; The central control and data processing unit controls the water pump flow and the opening and closing of the solenoid valve based on the rainfall intensity and water temperature, so as to realize the coordinated loading of rain and heat, and adjust the ambient temperature and humidity during the rain process.

6. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The salt spray / corrosive gas module includes a solution tank, atomizing nozzles, an air compressor, and a flow control valve; The central control and data processing unit controls the atomization spray and airflow distribution according to the set salt spray concentration, sedimentation rate and wind speed, and forms an interlock or priority control with the wind speed impact module.

7. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The power control and temperature rise feedback module of the device under test includes a programmable power supply, a power load, a device temperature sensor, and an electrical parameter acquisition unit. The central control and data processing unit dynamically adjusts the magnitude of electrical stress based on the real-time junction temperature or power status of the device under test, and adjusts the environmental stress accordingly.

8. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The central control and data processing unit has a stress priority arbitration mechanism, a preset stress priority matrix and concurrent interlocking rules, and automatically adjusts the loading order or amplitude of each stress when multiple stresses conflict, and triggers safety interlocking protection.

9. The multi-environment accelerated aging test platform for power electronic modules according to claim 8, characterized in that, The stress priority matrix includes the following interlocking rules: Lighting and water spray interlock: High-intensity lighting and water spray must not be turned on simultaneously; Salt spray and fan interlock: When the salt spray is activated, it automatically switches to low-speed corrosion-resistant fan mode; Access control and high-voltage interlock: Cut off all high-voltage power and stress sources when the hatch is not closed.

10. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The central control and data processing unit adopts a modular software architecture, including: The task scheduling module is used for real-time scheduling and priority management of various functional tasks of the system; The control logic module is used to implement experimental process control and decision-making algorithms; The data acquisition module is used to read all sensor and device status signals and perform preprocessing. The anomaly detection module is used to independently monitor the system's operating status and data from various sensors, and to determine whether an anomaly or malfunction has occurred based on preset rules. The above modules communicate through a data bus to enable configurable test parameters, visualized operating status, and recording and analysis of test data.

11. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The central control and data processing unit supports smooth transition control of stress switching. By setting the slope of parameter change, delay hysteresis and stage buffer control, it can realize the gradual switching between multiple stress loading states.

12. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The platform also includes a data acquisition and lifespan determination module, which is used for: Real-time acquisition of environmental parameters and device electrical parameters; Automatically determine device failure based on parameter drift criteria or functional failure criteria; Acceleration factors can be calculated and device lifetimes predicted using the Arrhenius model, Peck model, or Coffin-Manson model.

13. The multi-environment accelerated aging test platform for power electronic modules according to claim 1, characterized in that, The platform also includes a security protection system, including: Hardware safety interlocking circuits, including access control switches, over-temperature protectors, and emergency stop buttons; The software security monitoring module monitors whether various parameters exceed limits in real time; Fire alarm linkage devices include temperature sensors and automatic fire extinguishing equipment.

14. A multi-environment accelerated aging test method for power electronic modules, based on the multi-environment accelerated aging test platform for power electronic modules according to any one of claims 1-13, characterized in that, The method includes: Configure test parameters and set stress curves for temperature, humidity, light, wind speed, rain, and salt spray; Initiate multi-stress synchronous loading and apply multiple environmental stresses synchronously or sequentially according to a predetermined process; Real-time acquisition of environmental parameters and real-time monitoring of the performance parameters of the device under test to obtain performance degradation data; Acceleration factors and predicted lifetimes are calculated based on environmental parameters, device-under-test performance parameters, performance degradation data, and acceleration models. Failures are determined based on predefined failure criteria, and lifetime data is recorded.

15. A reliability evaluation system for power electronic modules, characterized in that, The multi-environment accelerated aging test platform for power electronic modules as described in any one of claims 1-13, and: A reliability database stores historical test data and failure cases; The report generation module automatically generates test reports and life assessment conclusions; The remote monitoring interface supports simultaneous access and data analysis by multiple users.

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