IGBT abnormal voltage turn-off method and system based on DSP intelligent algorithm

Abstract

The invention relates to an IGBT abnormal voltage turn-off method and system based on a DSP intelligent algorithm, and the method comprises the steps: obtaining the voltage waveform of the working voltage of an IGBT in real time, and transmitting the voltage waveform to a DSP processing unit; according to the voltage waveform, the voltage change rate and the change trend of the voltage waveform are calculated, and the voltage change rate comprises a climbing rate and a descending rate; based on a preset voltage threshold value and a preset voltage change rate threshold value, judging whether the voltage waveform has an abnormal rising trend or not; if the voltage waveform is judged to have an abnormal rising trend, triggering an IGBT turn-off instruction, and reducing the working voltage of the IGBT to a preset safety range; and when the working voltage of the IGBT reaches a preset safety range, triggering an IGBT restart instruction, and dynamically adjusting a voltage control strategy according to a change value of the working voltage of the IGBT. According to the invention, the operation safety of the IGBT is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power electronic control, and in particular to an IGBT abnormal voltage shutdown method and system based on a DSP intelligent algorithm. Background Art

[0002] At present, insulated gate bipolar transistors (IGBTs) are widely used in power electronic devices, especially in high-power applications such as motor control, inverters, and power supply regulation. IGBTs have the characteristics of high efficiency and high switching frequency, but during operation, they may become abnormal or even damaged due to abnormal voltage increase or rapid voltage fluctuation. To ensure the safe operation of IGBTs, their operating voltage must be monitored in real time and appropriate protection measures must be taken.

[0003] Most existing IGBT protection technologies rely on simple overvoltage protection mechanisms, such as shutting down the IGBT when the operating voltage exceeds a preset threshold. However, these traditional overvoltage protection methods usually only make judgments based on static voltage thresholds, without considering the voltage change rate and change trend, making it difficult to cope with dynamic voltage fluctuations such as rapid voltage increases.

[0004] The above-mentioned existing technical solutions have the following defects: the existing solutions generally adopt fixed voltage thresholds and shutdown strategies, and cannot adjust the control strategy according to the actual working state of the IGBT, so they cannot guarantee continuous and stable operation in complex environments, so there is room for improvement. Summary of the invention

[0005] In order to improve the operating safety of IGBT, the present application provides an IGBT abnormal voltage shutdown method and system based on DSP intelligent algorithm.

[0006] The above-mentioned invention objective of the present application is achieved through the following technical solutions: A method for shutting down an IGBT due to abnormal voltage based on a DSP intelligent algorithm, comprising: Acquire the voltage waveform of the IGBT working voltage in real time, and transmit the voltage waveform to the DSP processing unit; Calculating the voltage change rate and change trend of the voltage waveform according to the voltage waveform, wherein the voltage change rate includes a climbing rate and a falling rate; Based on a preset voltage threshold and a preset voltage change rate threshold, determining whether the voltage waveform has an abnormal rising trend; If the voltage waveform is determined to have an abnormally rising trend, an IGBT shutdown instruction is triggered, and the IGBT operating voltage is reduced to a preset safety range; When the IGBT operating voltage reaches the preset safety range, an IGBT restart instruction is triggered, and a voltage control strategy is dynamically adjusted according to a change in the IGBT operating voltage.

[0007] By adopting the above technical solution, by acquiring the voltage waveform of the IGBT working voltage in real time and transmitting the voltage waveform to the DSP processing unit, it is possible to ensure continuous and accurate monitoring of the voltage state of the IGBT, timely detect voltage anomalies, and provide data support for further protection mechanisms; by calculating the voltage change rate and change trend of the voltage waveform based on the voltage waveform, wherein the voltage change rate includes the climbing rate and the falling rate, it is possible to carefully analyze the change rate of the voltage waveform and accurately judge the dynamic behavior of the voltage waveform, thereby providing a scientific basis for judging whether the voltage has an abnormal rising trend; by judging whether the voltage waveform has an abnormal rising trend based on a preset voltage threshold and a preset voltage change rate threshold, it is possible to identify potential risks in advance before the voltage abnormally rises. Danger, thereby providing an effective decision-making basis for triggering the shutdown protection mechanism to prevent the equipment from entering an overvoltage dangerous state; by triggering the IGBT shutdown instruction if the voltage waveform is determined to have an abnormally rising trend, and reducing the IGBT operating voltage to a preset safe range, it can quickly respond to the abnormal situation of excessive voltage, and control the voltage within a safe range through shutdown protection measures, thereby avoiding the IGBT from being damaged by overvoltage and ensuring the safety of the equipment; by triggering the IGBT restart instruction when the IGBT operating voltage reaches the preset safe range, and dynamically adjusting the voltage control strategy according to the change value of the IGBT operating voltage, it can restore the normal operation of the equipment while ensuring safety, and accurately adjust the control strategy according to the voltage change, thereby improving the adaptability and stability of the system.

[0008] In one example, the present application may be further configured as follows: the real-time acquisition of the voltage waveform of the IGBT operating voltage and the transmission of the voltage waveform to the DSP processing unit include: Continuously collecting the operating voltage signal of the IGBT through a sampling module, and converting the operating voltage signal into digital voltage data through a high-speed AD converter; The digital voltage data is processed by a real-time sampling control algorithm to generate the voltage waveform, and the voltage waveform is transmitted to the DSP processing unit.

[0009] By adopting the above technical solution, the working voltage signal of the IGBT is continuously collected through the sampling module, and the working voltage signal is converted into digital voltage data through a high-speed AD converter, so that the accurate and real-time monitoring of the IGBT voltage can be realized, and the analog signal is converted into digital data, so as to provide a high-quality voltage data source for subsequent signal analysis and processing; the digital voltage data is processed by a real-time sampling control algorithm to generate the voltage waveform, and the voltage waveform is transmitted to the DSP processing unit, so that the voltage waveform can be dynamically analyzed and generated, so as to ensure the real-time and accuracy of data processing, and provide the DSP processing unit with effective voltage waveform information, so as to provide a reliable data basis for subsequent voltage abnormality monitoring and control decisions.

[0010] In one example, the present application may be further configured as follows: the voltage change rate and change trend of the voltage waveform are calculated according to the voltage waveform, wherein the voltage change rate includes a climbing rate and a falling rate including: Discretizing the voltage waveform to convert the voltage waveform into discrete voltage data points; The climbing rate and the falling rate are obtained by analyzing the voltage difference and the time interval between adjacent data points in the voltage data points; Based on the rising rate and falling rate of the voltage waveform, a changing trend of the voltage waveform is calculated.

[0011] By adopting the above technical solution, the voltage waveform is discretized and converted into discrete voltage data points, so that the continuous voltage waveform can be converted into discrete data points suitable for digital processing, simplifying subsequent calculations and making the voltage data easier to analyze and process; by analyzing the voltage difference and time interval between adjacent data points in the voltage data points, the climbing rate and the falling rate are obtained, and the changing rate of the voltage waveform, including the climbing and falling speeds, can be accurately calculated, thereby providing key parameters for monitoring abnormal voltage trends and taking appropriate control measures; based on the climbing rate and falling rate of the voltage waveform, the changing trend of the voltage waveform is calculated, and by combining the rate calculation, the changing direction and trend of the voltage waveform can be effectively analyzed, thereby judging whether the voltage has abnormal fluctuations or an increasing trend, and supporting further decision-making and protection mechanisms.

[0012] In one example, the present application may be further configured as follows: judging whether the voltage waveform has an abnormal rising trend based on a preset voltage threshold and a preset voltage change rate threshold includes: According to the historical waveform data of the IGBT operating voltage and the change trend of the voltage waveform, dynamically adjusting the preset voltage threshold using a preset adjustment algorithm to obtain an adjusted voltage threshold; comparing the maximum voltage value of the voltage waveform with the adjusted voltage threshold, and determining that the voltage waveform has an abnormally increasing trend if the maximum voltage value of the voltage waveform exceeds the adjusted voltage threshold; Comparing the rising rate of the voltage waveform with the preset voltage change rate threshold, if the rising rate of the voltage waveform exceeds the preset voltage change rate threshold, determining it as an abnormal rising trend; The voltage change rate and direction are analyzed in combination with the change trend of the voltage waveform. If the rising rate of the voltage waveform continues to increase and exceeds a preset range, it is determined to be an abnormal rising trend.

[0013] By adopting the above technical solution, the preset voltage threshold is dynamically adjusted according to the historical waveform data of the IGBT working voltage and the change trend of the voltage waveform by using a preset adjustment algorithm to obtain the adjusted voltage threshold. The voltage threshold can be flexibly adjusted according to the change law of the historical data to make it more adaptable to the current working environment and voltage changes, thereby enhancing the adaptability and accuracy of the system. By comparing the maximum voltage value of the voltage waveform with the adjusted voltage threshold, if the maximum voltage value of the voltage waveform exceeds the adjusted voltage threshold, it is determined to be an abnormally rising trend, and it can be judged in real time whether the voltage exceeds the safety range, so that protective measures can be taken in time to avoid excessive voltage causing equipment failure. damage or failure; by comparing the climbing rate of the voltage waveform with the preset voltage change rate threshold, if the climbing rate of the voltage waveform exceeds the preset voltage change rate threshold, it is determined to be an abnormal rising trend, which can accurately judge the speed of voltage rise. If it exceeds the safe preset range, the protection mechanism is triggered in time to effectively prevent the potential risks caused by voltage surges; by combining the changing trend of the voltage waveform, the voltage change rate and direction are analyzed. If the rising rate of the voltage waveform continues to increase and exceeds the preset range, it is determined to be an abnormal rising trend. Potential abnormal rising behavior can be identified from the trend change of the voltage waveform, and protective measures can be taken in advance to avoid the risk of voltage shock to the equipment.

[0014] In one example, the present application may be further configured as follows: dynamically adjusting the preset voltage threshold using a preset adjustment algorithm according to the historical waveform data of the IGBT operating voltage and the change trend of the voltage waveform, and obtaining the adjusted voltage threshold includes: By performing time series analysis on the historical waveform data of the IGBT operating voltage, the variation law and trend characteristics of the historical waveform data are extracted; Based on the change trend of the voltage waveform, weighted averaging is performed on the historical waveform data to obtain an adjustment factor; Based on the variation rules and trend characteristics of the historical waveform data, the preset voltage threshold is adjusted using the adjustment factor to form the adjusted voltage threshold.

[0015] By adopting the above technical solution, by performing time series analysis on the historical waveform data of the IGBT working voltage, the changing rules and trend characteristics of the historical waveform data are extracted, and the changing pattern of the voltage waveform over time can be identified, thereby capturing the potential changing trend, which is helpful to more accurately predict future voltage fluctuations and provide basic data support for the optimization of the voltage control strategy; by performing weighted averaging processing on the historical waveform data based on the changing trend of the voltage waveform to obtain the adjustment factor, the adjustment factor can be generated according to the importance and changing trend of the historical data to ensure that the adjustment of the preset threshold is more accurate and reflects the key changing characteristics in the historical waveform data; by adjusting the preset voltage threshold based on the changing rules and trend characteristics of the historical waveform data using the adjustment factor to form the adjusted voltage threshold, the voltage threshold can be dynamically adjusted according to the changing rules and trends in the historical waveform data, the adaptability and accuracy of the threshold are enhanced, and the response effect and accuracy of the high-voltage protection mechanism are improved.

[0016] In one example, the present application may be further configured as follows: the triggering of the IGBT shutdown instruction and the reduction of the IGBT operating voltage to a preset safety range includes: When it is detected that the voltage waveform is determined to have an abnormal rising trend, a shutdown control signal is immediately generated; Transmitting the shutdown control signal to the driving circuit of the IGBT, triggering the IGBT shutdown instruction, and cutting off the current flow path in the driving circuit of the IGBT; If the IGBT operating voltage fails to drop to the preset safety range within a preset time period, an overvoltage protection mechanism is activated to increase the voltage drop rate of the IGBT operating voltage; After the IGBT is turned off, the current working state of the IGBT is determined through a feedback mechanism, a feedback result is generated, and the turn-off timing and restart strategy of the IGBT are adjusted according to the feedback result.

[0017] By adopting the above technical solution, when it is detected that the voltage waveform is determined to have an abnormal rising trend, a shutdown control signal is immediately generated, so that a rapid response can be made at the moment when the voltage waveform shows an abnormal rising trend, thereby avoiding damage to the IGBT and other circuit components caused by excessive voltage, thus playing a protective role; by transmitting the shutdown control signal to the driving circuit of the IGBT, the IGBT shutdown instruction is triggered, and the current flow path in the driving circuit of the IGBT is cut off, so that the operation of the IGBT can be quickly interrupted, the current can be cut off, and the abnormal voltage can be prevented from causing further damage to the equipment, thereby ensuring the safety of the system; by When the voltage drops to the preset safety range, the overvoltage protection mechanism is activated to increase the voltage drop rate of the IGBT operating voltage, so as to accelerate the voltage drop when the voltage continues to be high, ensure that the operating voltage drops back to the safety range in time, and prevent the excessive voltage from having a long-term negative impact on the equipment; after the IGBT is turned off, the current working state of the IGBT is judged through the feedback mechanism, a feedback result is generated, and the shutdown timing and restart strategy of the IGBT are adjusted according to the feedback result, so that the shutdown and restart strategies can be optimized according to the actual shutdown effect and feedback information, thereby improving the stability and reliability of the system and avoiding unnecessary losses or risks caused by improper shutdown strategies.

[0018] In one example, the present application may be further configured as follows: the dynamically adjusting the voltage control strategy according to the change value of the IGBT operating voltage includes: Calculating the change data of the IGBT operating voltage according to the change value of the IGBT operating voltage, wherein the change data includes the amplitude, speed and trend of the voltage change; The voltage control strategy is dynamically adjusted according to the change data.

[0019] By adopting the above technical solution, by calculating the change data of the IGBT operating voltage according to the change value of the IGBT operating voltage, the change data includes the amplitude, speed and trend of the voltage change, so that the details of the voltage change can be monitored and captured in real time, and the amplitude, change rate and trend of the voltage fluctuation can be accurately understood, so as to provide necessary data support for further control and adjustment; by dynamically adjusting the voltage control strategy according to the change data, the voltage control strategy can be flexibly adjusted according to the specific situation of the voltage change, so as to ensure that the IGBT operating voltage is always kept within a safe and stable range, thereby improving the stability and protection performance of the circuit and avoiding equipment damage or system instability caused by excessive voltage fluctuations.

[0020] The second object of the invention is achieved by the following technical solutions: An IGBT abnormal voltage shutdown system based on a DSP intelligent algorithm, the IGBT abnormal voltage shutdown system based on a DSP intelligent algorithm comprising: A waveform acquisition module is used to acquire the voltage waveform of the IGBT working voltage in real time and transmit the voltage waveform to the DSP processing unit; A calculation module, used for calculating the voltage change rate and change trend of the voltage waveform according to the voltage waveform, wherein the voltage change rate includes a climbing rate and a falling rate; A judgment module, used for judging whether the voltage waveform has an abnormal rising trend based on a preset voltage threshold and a preset voltage change rate threshold; A shutdown module, configured to trigger an IGBT shutdown instruction if the voltage waveform is determined to have an abnormally rising trend, and reduce the IGBT operating voltage to a preset safety range; The restart module is used to trigger the IGBT restart instruction when the IGBT operating voltage reaches the preset safety range, and dynamically adjust the voltage control strategy according to the change value of the IGBT operating voltage.

[0021] By adopting the above technical solution, by acquiring the voltage waveform of the IGBT working voltage in real time and transmitting the voltage waveform to the DSP processing unit, it is possible to ensure continuous and accurate monitoring of the voltage state of the IGBT, timely detect voltage anomalies, and provide data support for further protection mechanisms; by calculating the voltage change rate and change trend of the voltage waveform based on the voltage waveform, wherein the voltage change rate includes the climbing rate and the falling rate, it is possible to carefully analyze the change rate of the voltage waveform and accurately judge the dynamic behavior of the voltage waveform, thereby providing a scientific basis for judging whether the voltage has an abnormal rising trend; by judging whether the voltage waveform has an abnormal rising trend based on a preset voltage threshold and a preset voltage change rate threshold, it is possible to identify potential risks in advance before the voltage abnormally rises. Danger, thereby providing an effective decision-making basis for triggering the shutdown protection mechanism to prevent the equipment from entering an overvoltage dangerous state; by triggering the IGBT shutdown instruction if the voltage waveform is determined to have an abnormally rising trend, and reducing the IGBT operating voltage to a preset safe range, it can quickly respond to the abnormal situation of excessive voltage, and control the voltage within a safe range through shutdown protection measures, thereby avoiding the IGBT from being damaged by overvoltage and ensuring the safety of the equipment; by triggering the IGBT restart instruction when the IGBT operating voltage reaches the preset safe range, and dynamically adjusting the voltage control strategy according to the change value of the IGBT operating voltage, it can restore the normal operation of the equipment while ensuring safety, and accurately adjust the control strategy according to the voltage change, thereby improving the adaptability and stability of the system.

[0022] In summary, this application includes the following beneficial technical effects: 1. By acquiring the voltage waveform of the IGBT working voltage in real time and transmitting the voltage waveform to the DSP processing unit, it is possible to ensure continuous and accurate monitoring of the voltage state of the IGBT, timely detect voltage anomalies, and provide data support for further protection mechanisms; by calculating the voltage change rate and change trend of the voltage waveform according to the voltage waveform, wherein the voltage change rate includes the climbing rate and the falling rate, the change rate of the voltage waveform can be carefully analyzed, and the dynamic behavior of the voltage waveform can be accurately judged, thereby providing a scientific basis for judging whether the voltage has an abnormal increase trend; by judging whether the voltage waveform has an abnormal increase trend based on a preset voltage threshold and a preset voltage change rate threshold, potential risks can be identified in advance before the voltage increases abnormally, thereby providing an effective decision-making basis for triggering the shutdown protection mechanism and preventing the equipment from entering an overvoltage dangerous state; 2. If the voltage waveform is judged to have an abnormal rising trend, the IGBT shutdown command is triggered, and the IGBT operating voltage is reduced to a preset safety range. It can quickly respond to the abnormal situation of excessive voltage, and control the voltage within a safe range through shutdown protection measures, thereby avoiding the IGBT from being damaged by overvoltage and ensuring the safety of the equipment. When the IGBT operating voltage reaches the preset safety range, the IGBT restart command is triggered, and the voltage control strategy is dynamically adjusted according to the change value of the IGBT operating voltage. It can restore the normal operation of the equipment while ensuring safety, and make precise control strategy adjustments according to voltage changes, thereby improving the adaptability and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of an IGBT abnormal voltage shutdown method based on a DSP intelligent algorithm in one embodiment of the present application; Figure 2 This is a flowchart for implementing step S10 in a method for shutting down an abnormal IGBT voltage based on a DSP intelligent algorithm in one embodiment of the present application; Figure 3 It is a flowchart for implementing step S20 in a method for shutting down an abnormal IGBT voltage based on a DSP intelligent algorithm in one embodiment of the present application; Figure 4 It is a flowchart for implementing step S30 in a method for shutting down an abnormal IGBT voltage based on a DSP intelligent algorithm in one embodiment of the present application; Figure 5 It is a flowchart for implementing step S31 in a method for shutting down an abnormal IGBT voltage based on a DSP intelligent algorithm in one embodiment of the present application; Figure 6It is a flowchart for implementing step S40 in a method for shutting down an abnormal IGBT voltage based on a DSP intelligent algorithm in one embodiment of the present application; Figure 7 It is a flowchart for implementing step S50 in a method for shutting down an abnormal IGBT voltage based on a DSP intelligent algorithm in one embodiment of the present application; Figure 8 This is a principle block diagram of an IGBT abnormal voltage shutdown system based on a DSP intelligent algorithm in one embodiment of the present application; DETAILED DESCRIPTION The present application is further described in detail below in conjunction with the accompanying drawings.

[0024] In one embodiment, if Figure 1 As shown, the present application discloses an IGBT abnormal voltage shutdown method based on DSP intelligent algorithm, which specifically includes the following steps: S10: Acquire the voltage waveform of the IGBT working voltage in real time, and transmit the voltage waveform to the DSP processing unit.

[0025] Specifically, during operation, the working voltage of the IGBT is first sampled in real time through the sampling module. The sampling module obtains the voltage signal of the IGBT at a certain frequency (for example, 1000 times per second). The sampling signal is an analog voltage signal, and then the analog signal is converted into a digital signal through a high-speed AD converter. Assuming that the working voltage range of the IGBT is 0-600V, the AD converter sets its resolution to 12 bits (that is, each value of the voltage signal can be expressed as 2 to the 12th power of possibilities), thereby ensuring that the converted voltage data is fine enough for subsequent accurate analysis. The converted voltage data will be transmitted to the DSP processing unit. The DSP processing unit is responsible for organizing these data into a voltage waveform, parsing the time series of the digital voltage signal, forming the voltage value corresponding to each moment, generating a voltage waveform, and further providing detailed information on voltage changes for subsequent analysis and judgment.

[0026] S20: Calculate the voltage change rate and change trend of the voltage waveform according to the voltage waveform, wherein the voltage change rate includes a climbing rate and a falling rate.

[0027] Specifically, the obtained voltage waveform is first discretized to convert the continuous voltage signal into discrete voltage data points. These data points are the values ​​of the voltage at each sampling moment. For example, when the sampling frequency is 1kHz, the voltage value is recorded every 1 millisecond, so that multiple voltage data points are obtained. Then, the voltage difference between adjacent voltage data points is calculated and divided by the time interval to obtain the climbing rate and the falling rate of the voltage waveform. Assuming that at two consecutive sampling points, the voltages are 250V and 255V, respectively, and the time interval is 0.01 seconds, then the climbing rate is (255V-250V) / 0.01 seconds=500V / s. Similar calculations are performed on the entire voltage waveform to obtain the climbing rate and the falling rate in different time periods, and these rates are used to determine the changing trend of the voltage waveform. For example, if the climbing rate continues to rise, it may indicate that the voltage has a tendency to rise abnormally quickly. Conversely, an increase in the falling rate indicates that the voltage may have an abnormally falling trend. This information can effectively predict whether an abnormal increase has occurred.

[0028] S30: Based on a preset voltage threshold and a preset voltage change rate threshold, determine whether the voltage waveform has an abnormal rising trend.

[0029] Specifically, by performing real-time analysis on the voltage waveform, when the voltage value or the climbing rate of the voltage waveform exceeds the preset threshold, it is judged that the voltage waveform has an abnormal rising trend. For example, the preset voltage threshold is 500V. If the voltage exceeds this value at a certain moment, it may indicate that the voltage waveform has the risk of abnormal increase. In addition, the climbing rate of the voltage waveform exceeds the preset threshold (such as 1000V / s), which can also be used as a basis for judgment. In order to further improve the accuracy of the judgment, an adjusted voltage threshold can also be calculated based on the historical data of the voltage waveform. For example, in the previous operation, the voltage had a certain upward trend. By analyzing the previous voltage waveform, a new threshold is obtained, making the current voltage waveform judgment more sensitive and accurate. Assuming that at a certain moment the voltage value reaches 510V and the climbing rate is 1200V / s, both conditions exceed the set threshold, then it can be judged that the voltage waveform has an abnormally rising trend.

[0030] S40: If the voltage waveform is determined to have an abnormally increasing trend, an IGBT shutdown instruction is triggered, and the IGBT operating voltage is reduced to a preset safety range.

[0031] Specifically, when the abnormal rising trend of the voltage waveform is determined, a shutdown control signal is immediately generated, and the shutdown control signal is sent to the IGBT through the drive circuit, thereby triggering the shutdown operation. When shutting down, the current flow path is cut off, and the IGBT stops working quickly to prevent the voltage from continuing to rise and causing damage to the circuit or equipment. For example, when an abnormal increase in the voltage waveform is detected, the shutdown signal is triggered through the set hardware interface, and after the current is cut off, the operating voltage of the IGBT will continue to be monitored until the voltage returns to a preset safety range (for example, less than 450V). If the operating voltage does not return to the safe range in a short time, it may be necessary to accelerate the rate of voltage drop and activate the overvoltage protection mechanism. By adjusting the intensity of the shutdown signal, the voltage recovery process is further accelerated to ensure the safety of the equipment.

[0032] S50: When the IGBT operating voltage reaches a preset safety range, an IGBT restart instruction is triggered, and the voltage control strategy is dynamically adjusted according to the change value of the IGBT operating voltage.

[0033] Specifically, when the operating voltage of the IGBT returns to a safe range (e.g., below 450V), a restart instruction is generated and transmitted to the driving circuit of the IGBT, triggering the IGBT to restart. During the restart process, the voltage control strategy is dynamically adjusted according to the amplitude, rate of change, and trend of the voltage change. For example, if the voltage drops too fast, it may cause the device to start and shut down frequently. Therefore, the voltage control strategy during restart is adjusted to slow down the rate of voltage recovery to avoid repeated startup and shutdown processes. Specifically, the current working state is analyzed by calculating the voltage change data (such as the amplitude, speed, and trend of the voltage change), and the voltage control strategy is adjusted in real time according to the trend of the change to ensure that the restart process of the IGBT is smooth and reliable, and to minimize the occurrence of overvoltage or undervoltage. In addition, the working state of the IGBT is judged through the feedback mechanism, and the voltage control strategy is dynamically adjusted to adapt to environmental changes and load conditions.

[0034] By adopting the above technical solution, by acquiring the voltage waveform of the IGBT working voltage in real time and transmitting the voltage waveform to the DSP processing unit, it is possible to ensure continuous and accurate monitoring of the voltage state of the IGBT, timely detect voltage anomalies, and provide data support for further protection mechanisms; by calculating the voltage change rate and change trend of the voltage waveform based on the voltage waveform, wherein the voltage change rate includes the climbing rate and the falling rate, it is possible to carefully analyze the change rate of the voltage waveform and accurately judge the dynamic behavior of the voltage waveform, thereby providing a scientific basis for judging whether the voltage has an abnormal rising trend; by judging whether the voltage waveform has an abnormal rising trend based on a preset voltage threshold and a preset voltage change rate threshold, it is possible to identify potential risks in advance before the voltage abnormally rises. Danger, thereby providing an effective decision-making basis for triggering the shutdown protection mechanism to prevent the equipment from entering an overvoltage dangerous state; by triggering the IGBT shutdown instruction if the voltage waveform is determined to have an abnormally rising trend, and reducing the IGBT operating voltage to a preset safe range, it can quickly respond to the abnormal situation of excessive voltage, and control the voltage within a safe range through shutdown protection measures, thereby avoiding the IGBT from being damaged by overvoltage and ensuring the safety of the equipment; by triggering the IGBT restart instruction when the IGBT operating voltage reaches the preset safe range, and dynamically adjusting the voltage control strategy according to the change value of the IGBT operating voltage, it can restore the normal operation of the equipment while ensuring safety, and accurately adjust the control strategy according to the voltage change, thereby improving the adaptability and stability of the system.

[0035] In one embodiment, if Figure 2 As shown, in step S10, the voltage waveform of the IGBT working voltage is obtained in real time, and the voltage waveform is transmitted to the DSP processing unit, which specifically includes: S11: Continuously collect the operating voltage signal of the IGBT through the sampling module, and convert the operating voltage signal into digital voltage data through a high-speed AD converter.

[0036] Specifically, the working voltage signal of the IGBT is first continuously monitored through the sampling module. This module is usually a high-precision voltage sensor that can accurately capture the instantaneous change of the voltage within the voltage range. The sampling frequency may be set to 1kHz or higher, and the sampling frequency is selected according to actual needs. For example, when the sampling frequency is set to 1kHz, 1000 voltage values ​​will be collected per second. Each time the voltage signal is sampled, it is an analog signal and cannot be directly digitized. Therefore, it is necessary to convert the analog voltage signal into digital voltage data through a high-speed AD converter. The AD converter usually has high precision and high speed characteristics. For example, a 12-bit or 16-bit conversion accuracy is used, so that each voltage signal can be quantized in detail, so that the details of the voltage waveform can be accurately reflected. For example, if the voltage signal fluctuates between 0 and 600V, a 12-bit converter can refine the voltage into 2 to the 12th power voltage points, that is, 4096 voltage values, so that the small changes in voltage can be represented very accurately. The converted digitized voltage data can be used for further processing and analysis to form a subsequent voltage waveform.

[0037] S12: Process the digital voltage data through a real-time sampling control algorithm to generate a voltage waveform, and transmit the voltage waveform to the DSP processing unit.

[0038] Specifically, after the digital voltage data is collected, the data is processed by the real-time sampling control algorithm. The main function of this algorithm is to convert the time series data into a voltage waveform that can be analyzed. First, the real-time sampling control algorithm removes noise and interference through data filtering to ensure the accuracy and effectiveness of the voltage data. For example, when a short-term voltage spike or noise appears during the sampling process, the algorithm will smooth or average the data to reduce the impact on subsequent analysis. Then, the algorithm will arrange these filtered digital voltage data in chronological order and form a complete voltage waveform. For example, assuming that the collected voltage data sequence is as follows: 0V, 100V, 150V, 200V, 250V..., these data will be processed continuously and displayed as a voltage waveform diagram in the order of the time axis. At this time, the voltage waveform diagram shows the change of voltage over time, and the waveform can be used to determine whether the voltage has abnormal fluctuations or drastic changes. Finally, the generated voltage waveform data is transmitted to the DSP processing unit through the communication interface for further calculation and analysis. The DSP unit will continue to execute the control strategy according to the voltage waveform data, such as determining whether the voltage exceeds the preset safety threshold and performing related protection operations.

[0039] In one embodiment, if Figure 3 As shown, in step S20, the voltage change rate and change trend of the voltage waveform are calculated according to the voltage waveform, which specifically includes: S21: Discretize the voltage waveform to convert the voltage waveform into discrete voltage data points.

[0040] Specifically, after the voltage waveform is converted through high-speed AD conversion, a series of continuous digital voltage data is obtained. However, in order to more accurately analyze the changes in the voltage waveform, these data must first be discretized. The discretization step is to sample the continuous data points in the voltage waveform at fixed time intervals, and record the voltage value of each sampling point as an independent data point. For example, assuming the sampling frequency is 1kHz, that is, 1000 samples per second, a corresponding voltage data point will be obtained at each time point, so that the changes in the original voltage waveform can be represented by these discrete voltage data points. In this way, the voltage waveform is converted into a sequence of multiple discrete data points. These data points reflect the change information of the voltage at a specific moment and can provide a data basis for subsequent rate analysis.

[0041] S22: The climbing rate and the falling rate are obtained by analyzing the voltage difference and the time interval between adjacent data points in the voltage data points.

[0042] Specifically, in the discretized sequence of voltage data points, the rate of change of voltage can be calculated by comparing adjacent data points. First, take two adjacent data points, assuming that they are voltage data point A and voltage data point B, and calculate the voltage difference ΔV between them (i.e., the voltage value at point B minus the voltage value at point A). Then, calculate the time interval Δt between the two data points (i.e., the timestamp at point B minus the timestamp at point A), and thus obtain the voltage change rate (ΔV / Δt). If ΔV is a positive value, it means that the voltage is rising, otherwise it means that the voltage is falling. For example, if there are two data points A (voltage value of 100V, time of 1 second) and B (voltage value of 120V, time of 1.02 seconds), the voltage difference ΔV=120V-100V=20V, the time difference Δt=1.02-1=0.02 seconds, then the voltage climbing rate is 20V / 0.02s=1000V / s, indicating that the voltage rise rate is 1000 volts per second. Similarly, if the voltage value between adjacent data points decreases, the rate of decrease is calculated. If the calculated rate exceeds the preset range, it means that the voltage changes rapidly and there may be an abnormality. In this way, the climbing rate and the falling rate of the voltage waveform can be obtained.

[0043] S23: Based on the rising rate and falling rate of the voltage waveform, a changing trend of the voltage waveform is calculated.

[0044] Specifically, by analyzing the climbing rate and the falling rate of multiple voltage data points, the changing trend of the voltage waveform can be determined. If the climbing rate continues to exceed the set threshold and appears continuously in time, it means that the voltage waveform may have an abnormally rising trend; similarly, if the falling rate continues to increase, it may also indicate that the voltage waveform has an abnormally falling trend. By further analyzing the rate changes in different time periods, it can be determined whether the voltage waveform is in a stable, rising or falling state, thereby providing a basis for subsequent control. For example, if the climbing rate of the voltage waveform is maintained above 500V / s for 5 consecutive sampling points, while the falling rate is lower, it can be inferred that the voltage waveform may show a continuous rising trend, and preventive measures may need to be taken; conversely, if the falling rate of the voltage waveform is faster and exceeds a certain threshold, it may indicate the risk of a sharp drop in voltage. Through a comprehensive analysis of these climbing rates and falling rates, the overall changing trend of the voltage waveform can be obtained.

[0045] In one embodiment, if Figure 4 As shown, in step S30, based on the preset voltage threshold and the preset voltage change rate threshold, it is determined whether the voltage waveform has an abnormal rising trend, specifically including: S31: According to the historical waveform data of the IGBT operating voltage and the change trend of the voltage waveform, a preset voltage threshold is dynamically adjusted using a preset adjustment algorithm to obtain an adjusted voltage threshold.

[0046] Specifically, by analyzing the historical waveform data of the IGBT working voltage, the fluctuation law of the voltage in different time periods can be obtained, such as the peak value, fluctuation frequency and trend of the voltage. Based on these historical data, the normal variation range and trend of the voltage waveform can be inferred, so as to preset a preliminary voltage threshold. In order to better adapt to the real-time changes of the voltage waveform, the preset voltage threshold needs to be adjusted dynamically. At this time, an adjustment algorithm based on historical data and waveform change trend can be used to adjust the threshold in real time. Specifically, the algorithm will judge whether the voltage waveform has abnormal fluctuations based on recent voltage waveform data. If the fluctuation amplitude of the voltage waveform is large or continues to rise, the algorithm will automatically increase the voltage threshold, otherwise it will appropriately reduce the voltage threshold. For example, if the rising speed of the voltage waveform exceeds the preset threshold in the past 100 milliseconds, and its maximum value continues to be higher than the historical value, then the adjustment algorithm will dynamically increase the voltage threshold to adapt to the new voltage waveform characteristics, thereby ensuring the rationality and sensitivity of the voltage threshold.

[0047] S32: Compare the maximum voltage value of the voltage waveform with the adjusted voltage threshold value. If the maximum voltage value of the voltage waveform exceeds the adjusted voltage threshold value, it is determined to be an abnormally increasing trend.

[0048] Specifically, once the adjusted voltage threshold is updated, the maximum voltage value of the current voltage waveform can be immediately compared with the adjusted threshold. The maximum voltage value usually refers to the maximum value of the voltage data collected within a period of time, and this value can reflect the extreme value of the voltage waveform. By comparing with the adjusted voltage threshold, if the maximum voltage value exceeds the threshold range, it can be determined that the voltage waveform has an abnormally rising trend, which may mean that the operating voltage of the IGBT has abnormal fluctuations. If not handled in time, it may cause equipment damage or abnormal operation. For example, assuming that the adjusted voltage threshold is 150V, and the maximum voltage value of the current voltage waveform is 155V, it can be determined that the maximum value of the voltage waveform exceeds the safe range, so corresponding control measures need to be taken, such as triggering the IGBT shutdown command to avoid further voltage increases.

[0049] S33: Compare the rising rate of the voltage waveform with a preset voltage change rate threshold. If the rising rate of the voltage waveform exceeds the preset voltage change rate threshold, it is determined to be an abnormal rising trend.

[0050] Specifically, the climbing rate of the voltage waveform can be obtained by calculating the rate of voltage change between adjacent data points. Usually, this rate is more obvious when the voltage waveform rises. If the climbing rate continues to exceed the preset voltage change rate threshold, it can be determined that the voltage has an abnormally rising trend. The preset voltage change rate threshold is usually set based on the working characteristics of the equipment and the historical waveform. For example, assuming that the threshold is 1000V / s, and the current voltage waveform climbing rate is 1200V / s, this means that the rate of change of the voltage waveform exceeds the safe range. Therefore, it can be determined that the voltage waveform has an abnormally rising trend, and corresponding protective measures need to be taken to avoid equipment damage.

[0051] S34: Analyze the voltage change rate and direction in combination with the change trend of the voltage waveform. If the rising rate of the voltage waveform continues to increase and exceeds a preset range, it is determined to be an abnormal rising trend.

[0052] Specifically, the changing trend of the voltage waveform includes its rising rate, falling rate and overall fluctuation of the voltage. By analyzing these changing trends, it is possible to more comprehensively determine whether the voltage waveform has an abnormal rising trend. For example, if the rising rate of the voltage waveform continues to increase in multiple consecutive sampling points, and its rate exceeds the preset safety range (for example, the preset rising rate is set to 1500V / s, and the actual voltage waveform rising rate is 2000V / s), this indicates that the rising speed of the voltage waveform has accelerated and has exceeded the range that the equipment can withstand, so it can be determined that the voltage waveform has an abnormal rising trend, which may cause overvoltage in the equipment. Therefore, combined with the rising rate of the voltage waveform and its continuous growth trend, it can be effectively determined whether it is necessary to take shutdown or other protective measures to prevent the voltage waveform from continuing to rise, thereby ensuring the safe operation of the equipment.

[0053] In one embodiment, if Figure 5 As shown, in step S31, the preset voltage threshold is dynamically adjusted using a preset adjustment algorithm according to the historical waveform data of the IGBT operating voltage and the change trend of the voltage waveform to obtain the adjusted voltage threshold, which specifically includes: S311: By performing time series analysis on the historical waveform data of the IGBT operating voltage, the variation rules and trend characteristics of the historical waveform data are extracted.

[0054] Specifically, by performing time series analysis on the historical waveform data of the IGBT operating voltage, the periodicity, trend, and fluctuation characteristics of the voltage waveform between cycles can be identified. Time series analysis usually includes smoothing of the voltage waveform, frequency domain analysis, and trend line fitting. For example, the sliding average method can be used to smooth the original voltage waveform, remove noise, and identify the rising, falling, and stable areas of the voltage waveform; in addition, the voltage data can be fitted using methods such as linear regression or exponential smoothing to analyze its long-term trend. If the waveform data has periodic fluctuations, the frequency components are analyzed by Fourier transform or wavelet transform to extract the main frequency and amplitude characteristics in order to understand the variation law of the voltage waveform. In addition, by calculating the statistical characteristics of the voltage waveform such as the maximum value, minimum value, and standard deviation, the variation range and abnormal fluctuations of the waveform can be revealed.

[0055] S312: Based on the change trend of the voltage waveform, weighted average processing is performed on the historical waveform data to obtain an adjustment factor.

[0056] Specifically, after determining the changing trend of the voltage waveform, the historical waveform data can be processed by weighted averaging to extract an adjustment factor for adjusting the voltage threshold. Weighted averaging is to assign different weights to the waveform data at each time point, and the data points with larger weights have a greater impact on the final result. For example, if the voltage changes more drastically in certain time periods in the waveform data (such as rapid rise or fall of voltage), these data points can be assigned higher weights to ensure that they have a more significant impact on the adjustment factor. In specific implementation, a weight can be assigned to the voltage value at each time point, and the calculation of the weight can be based on the change amplitude of the voltage value, the frequency of fluctuation or other characteristics. For example, for the data points in the rising stage of voltage, the weight can be set according to the rate of voltage change. The greater the rate of change, the higher the weight. After weighted averaging, the obtained adjustment factor will reflect the actual fluctuation trend of the voltage waveform and can be used to dynamically adjust the voltage threshold.

[0057] S313: Based on the variation rules and trend characteristics of the historical waveform data, the preset voltage threshold is adjusted using the adjustment factor to form an adjusted voltage threshold.

[0058] Specifically, the preset voltage threshold can be adjusted using the adjustment factor obtained above to more accurately reflect the changing law and trend characteristics of the voltage waveform. In actual operation, the preset voltage threshold is usually a static value set according to the working requirements and safety standards of the equipment, but in the face of actual fluctuations, it may be necessary to adjust it dynamically to ensure the safe operation of the equipment. The adjustment method can be to directly modify the voltage threshold in a weighted manner, for example, by multiplying the adjustment factor with the preset voltage threshold to obtain a new threshold, so that the threshold can be finely adjusted according to the actual changes in the voltage waveform. For example, assuming that the preset voltage threshold is 200V, and the adjustment factor obtained by analyzing the changing trend of the voltage waveform is 1.05, then the adjusted voltage threshold will become 200V*1.05=210V, which means that the voltage threshold is adjusted higher to adapt to the new changing trend of the voltage waveform. If the changing trend of the waveform shows that the voltage rises more, the adjustment factor may be further increased, thereby raising the voltage threshold to ensure that appropriate protection can still be provided in the case of large voltage fluctuations.

[0059] In one embodiment, if Figure 6 As shown, in step S40, the IGBT shutdown instruction is triggered, and the IGBT operating voltage is reduced to a preset safety range, which specifically includes: S41: When it is detected that the voltage waveform has an abnormally increasing trend, a shutdown control signal is immediately generated.

[0060] Specifically, when it is detected that the voltage waveform shows an abnormal rising trend, it is necessary to determine whether it exceeds the normal working range by real-time analysis of the voltage waveform data, especially the comparison of the climbing rate and the maximum voltage value. Assuming that the voltage waveform exceeds the set voltage threshold or the climbing rate exceeds the preset threshold in a short period of time, the generation of the shutdown control signal can be triggered by the preset algorithm. The generation of the shutdown control signal is based on the real-time analysis of the voltage waveform changes. The current voltage data can be compared with the preset safety threshold through hardware or software, thereby automatically triggering the shutdown mechanism. For example, when the maximum value of the voltage waveform exceeds the dynamically adjusted voltage threshold, or the climbing rate exceeds the set rate threshold, a shutdown signal is automatically generated to ensure that the IGBT component avoids overvoltage.

[0061] S42: Transmitting a shutdown control signal to the driving circuit of the IGBT, triggering an IGBT shutdown instruction, and cutting off a current flow path in the driving circuit of the IGBT.

[0062] Specifically, after the shutdown control signal is generated, it is transmitted to the driving circuit of the IGBT through the control logic or communication interface (such as SPI or I2C protocol) in the circuit. During this process, the shutdown signal can be received by the driving circuit and trigger the shutdown command. After receiving the shutdown command, the driving circuit disconnects the current flow path through the switch control mechanism, thereby shutting down the IGBT. The shutdown command is generally implemented by controlling the gate drive signal. The gate signal is quickly removed, causing the IGBT to lose its conduction ability, cutting off the current flow path, and preventing the voltage from being too high to cause damage to the device. For example, if the gate voltage of the IGBT is pulled down to 0V, the on state of the IGBT is released, and the current cannot flow through its channel, achieving a protective effect.

[0063] S43: If the IGBT operating voltage fails to drop to a preset safety range within a preset time period, the overvoltage protection mechanism is activated to increase the voltage drop rate of the IGBT operating voltage.

[0064] Specifically, after the IGBT is turned off, its operating voltage is monitored in real time and compared with the preset safety range to determine whether it has successfully dropped to the safety range within a predetermined time period. If the voltage does not drop quickly to the safety range within the specified time (such as within a few milliseconds to hundreds of milliseconds), it may trigger the risk of excessive voltage, so the overvoltage protection mechanism is activated. The implementation of the overvoltage protection mechanism can accelerate the reduction of voltage by increasing the voltage drop rate after the IGBT is turned off, for example, by adjusting the characteristics of the drive circuit after shutdown, increasing the current flowing through the resistor, or accelerating the voltage attenuation process through other passive components to ensure that the operating voltage of the IGBT is reduced to a safe level in the shortest time. This adjustment is based on real-time voltage monitoring data. If the voltage change rate is too slow, the voltage drop rate after shutdown is adjusted by design to avoid the risk of the device being in a high voltage state.

[0065] S44: After the IGBT is turned off, the current working state of the IGBT is determined through a feedback mechanism, a feedback result is generated, and the turn-off timing and restart strategy of the IGBT are adjusted according to the feedback result.

[0066] Specifically, after the IGBT is turned off, the working state of the IGBT can be monitored in real time through the feedback mechanism. This process usually includes collecting various parameters after the IGBT is turned off, such as output voltage, current change, power consumption, etc., through sensors or voltage and current acquisition circuits. The feedback mechanism analyzes these data to determine whether the IGBT has been completely turned off and whether there are any abnormal conditions (such as current leakage, excessive reverse voltage, etc.), and generates feedback results. Based on these feedback results, the shutdown timing or restart strategy is further adjusted. For example, if the feedback results show that the shutdown time is too long or the IGBT is still in a high-voltage state, it may be necessary to adjust the shutdown timing, shorten the shutdown time, or speed up the shutdown process; and if the feedback results show that the IGBT has not been completely turned off, it may be necessary to adopt a restart strategy to restart the IGBT and re-evaluate the operating voltage.

[0067] In one embodiment, if Figure 7 As shown, in step S50, the IGBT restart instruction is triggered, and the voltage control strategy is dynamically adjusted according to the change value of the IGBT working voltage, which specifically includes: S51: Calculate the change data of the IGBT operating voltage according to the change value of the IGBT operating voltage, where the change data includes the amplitude, speed and trend of the voltage change.

[0068] Specifically, based on the change data of the IGBT working voltage, the voltage change amplitude, change speed and its development trend can be calculated in real time. The voltage amplitude refers to the difference between the maximum and minimum values ​​of the voltage, the change speed is the rate of change of the voltage value over time, and the trend refers to the direction and law of the change of the voltage value over a period of time. Through the differential calculation method, the rate of voltage change can be obtained; through fitting or trend analysis, the long-term and short-term change trends of the voltage waveform can be understood. For example, if the voltage continues to rise at a fast rate within a specific time period, then its voltage change trend will be regarded as an upward trend; conversely, if the voltage fluctuation is small within a certain range, it is a stable trend.

[0069] S52: Dynamically adjust the voltage control strategy according to the changed data.

[0070] Specifically, based on the voltage change data, the voltage control strategy is dynamically adjusted. The control strategy is optimized based on the real-time monitoring data, especially the voltage amplitude, speed and trend changes. For example, when the voltage fluctuates greatly and rises rapidly, the voltage control strategy may be more conservative and trigger more protection measures in time; when the voltage changes are stable and within the expected range, the control strategy may be more relaxed to ensure the efficient operation of the equipment. Specific adjustment measures may include modifying the frequency, adjustment amplitude and threshold setting of the voltage regulation, adjusting the voltage rise and fall rate, or dynamically adjusting the triggering conditions of the protection strategy according to the characteristics of the voltage waveform, thereby optimizing the operation and protection strategy of the IGBT.

[0071] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0072] In one embodiment, an IGBT abnormal voltage shutdown system based on a DSP intelligent algorithm is provided, and the IGBT abnormal voltage shutdown system based on a DSP intelligent algorithm corresponds one-to-one to the IGBT abnormal voltage shutdown method based on a DSP intelligent algorithm in the above embodiment. Figure 8 As shown, the IGBT abnormal voltage shutdown system based on DSP intelligent algorithm includes a waveform acquisition module, a calculation module, a judgment module, a shutdown module and a restart module. The detailed description of each functional module is as follows: A waveform acquisition module is used to acquire the voltage waveform of the IGBT working voltage in real time and transmit the voltage waveform to the DSP processing unit; A calculation module, used to calculate the voltage change rate and change trend of the voltage waveform according to the voltage waveform, wherein the voltage change rate includes a climbing rate and a falling rate; A judgment module, used to judge whether the voltage waveform has an abnormal rising trend based on a preset voltage threshold and a preset voltage change rate threshold; A shutdown module is used to trigger an IGBT shutdown instruction and reduce the IGBT operating voltage to a preset safety range if the voltage waveform is judged to have an abnormal rising trend; The restart module is used to trigger the IGBT restart instruction when the IGBT operating voltage reaches a preset safety range, and dynamically adjust the voltage control strategy according to the change value of the IGBT operating voltage.

[0073] Optionally, the waveform acquisition module includes: The digitization submodule is used to continuously collect the working voltage signal of the IGBT through the sampling module, and convert the working voltage signal into digital voltage data through a high-speed AD converter; The data processing submodule is used to process the digital voltage data through a real-time sampling control algorithm, generate a voltage waveform, and transmit the voltage waveform to the DSP processing unit.

[0074] Optionally, the computing module includes: The discrete processing submodule is used to discretize the voltage waveform and convert the voltage waveform into discrete voltage data points; The calculation rate submodule is used to obtain the climbing rate and the falling rate by analyzing the voltage difference and the time interval between adjacent data points in the voltage data points; The trend calculation submodule is used to calculate the change trend of the voltage waveform based on the climbing rate and falling rate of the voltage waveform.

[0075] Optionally, the judgment module includes: The threshold adjustment submodule is used to dynamically adjust the preset voltage threshold using a preset adjustment algorithm according to the historical waveform data of the IGBT operating voltage and the change trend of the voltage waveform to obtain the adjusted voltage threshold; A threshold comparison submodule is used to compare the maximum voltage value of the voltage waveform with the adjusted voltage threshold value. If the maximum voltage value of the voltage waveform exceeds the adjusted voltage threshold value, it is determined to be an abnormally rising trend; The rate comparison submodule is used to compare the climbing rate of the voltage waveform with a preset voltage change rate threshold. If the climbing rate of the voltage waveform exceeds the preset voltage change rate threshold, it is determined to be an abnormal rising trend; The trend analysis submodule is used to analyze the voltage change rate and direction in combination with the change trend of the voltage waveform. If the rising rate of the voltage waveform continues to increase and exceeds a preset range, it is determined to be an abnormal rising trend.

[0076] Optionally, the threshold adjustment submodule includes: A timing analysis unit is used to extract the changing rules and trend characteristics of the historical waveform data by performing time series analysis on the historical waveform data of the IGBT operating voltage; A factor unit is obtained, which is used to perform weighted average processing on historical waveform data based on the change trend of the voltage waveform to obtain an adjustment factor; The threshold adjustment unit is used to adjust the preset voltage threshold using an adjustment factor based on the change law and trend characteristics of the historical waveform data to form an adjusted voltage threshold.

[0077] Optionally, the shutdown module includes: A signal generation submodule is used to immediately generate a shutdown control signal when it is detected that the voltage waveform is determined to have an abnormal rising trend; A cut-off path submodule is used to transmit a shutdown control signal to the IGBT drive circuit, trigger an IGBT shutdown instruction, and cut off the current flow path in the IGBT drive circuit; The rate increase submodule is used to activate the overvoltage protection mechanism and increase the voltage drop rate of the IGBT operating voltage if the IGBT operating voltage fails to drop to a preset safety range within a preset time period; The feedback adjustment submodule is used to determine the current working state of the IGBT through the feedback mechanism after the IGBT is turned off, generate a feedback result, and adjust the shutdown timing and restart strategy of the IGBT according to the feedback result.

[0078] Optionally, the restart module includes: The calculation amplitude submodule is used to calculate the change data of the IGBT working voltage according to the change value of the IGBT working voltage, and the change data includes the amplitude, speed and trend of the voltage change; The dynamic adjustment strategy submodule is used to dynamically adjust the voltage control strategy according to the changing data.

[0079] For the specific definition of an IGBT abnormal voltage shutdown system based on DSP intelligent algorithm, please refer to the definition of an IGBT abnormal voltage shutdown method based on DSP intelligent algorithm above, which will not be repeated here. Each module in the above-mentioned IGBT abnormal voltage shutdown system based on DSP intelligent algorithm can be implemented in whole or in part by software, hardware and their combination. The above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0080] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above.

[0081] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An IGBT abnormal voltage shutdown method based on DSP intelligent algorithm, characterized in that: The IGBT abnormal voltage shutdown method based on DSP intelligent algorithm includes: Acquire the voltage waveform of the IGBT working voltage in real time, and transmit the voltage waveform to the DSP processing unit; Calculating the voltage change rate and change trend of the voltage waveform according to the voltage waveform, wherein the voltage change rate includes a climbing rate and a falling rate; Based on a preset voltage threshold and a preset voltage change rate threshold, determining whether the voltage waveform has an abnormal rising trend; If the voltage waveform is determined to have an abnormally rising trend, an IGBT shutdown instruction is triggered, and the IGBT operating voltage is reduced to a preset safety range; When the IGBT operating voltage reaches the preset safety range, an IGBT restart instruction is triggered, and a voltage control strategy is dynamically adjusted according to a change in the IGBT operating voltage.

2. The IGBT abnormal voltage shutdown method based on DSP intelligent algorithm according to claim 1 is characterized in that: The real-time acquisition of the voltage waveform of the IGBT operating voltage and the transmission of the voltage waveform to the DSP processing unit comprises: Continuously collecting the operating voltage signal of the IGBT through a sampling module, and converting the operating voltage signal into digital voltage data through a high-speed AD converter; The digital voltage data is processed by a real-time sampling control algorithm to generate the voltage waveform, and the voltage waveform is transmitted to the DSP processing unit.

3. The IGBT abnormal voltage shutdown method based on DSP intelligent algorithm according to claim 1 is characterized in that: The voltage waveform is used to calculate the voltage change rate and change trend of the voltage waveform, wherein the voltage change rate includes a climbing rate and a falling rate, and includes: Discretizing the voltage waveform to convert the voltage waveform into discrete voltage data points; The climbing rate and the falling rate are obtained by analyzing the voltage difference and the time interval between adjacent data points in the voltage data points; Based on the rising rate and falling rate of the voltage waveform, a changing trend of the voltage waveform is calculated.

4. The IGBT abnormal voltage shutdown method based on DSP intelligent algorithm according to claim 1 is characterized in that: The determining whether the voltage waveform has an abnormal rising trend based on a preset voltage threshold and a preset voltage change rate threshold includes: According to the historical waveform data of the IGBT operating voltage and the change trend of the voltage waveform, dynamically adjusting the preset voltage threshold using a preset adjustment algorithm to obtain an adjusted voltage threshold; Comparing the maximum voltage value of the voltage waveform with the adjusted voltage threshold, and determining that the voltage waveform has an abnormally increasing trend if the maximum voltage value of the voltage waveform exceeds the adjusted voltage threshold; Comparing the rising rate of the voltage waveform with the preset voltage change rate threshold, if the rising rate of the voltage waveform exceeds the preset voltage change rate threshold, determining it as an abnormal rising trend; The voltage change rate and direction are analyzed in combination with the change trend of the voltage waveform. If the rising rate of the voltage waveform continues to increase and exceeds a preset range, it is determined to be an abnormal rising trend.

5. The IGBT abnormal voltage shutdown method based on DSP intelligent algorithm according to claim 4 is characterized in that: The method of dynamically adjusting the preset voltage threshold using a preset adjustment algorithm according to the historical waveform data of the IGBT operating voltage and the change trend of the voltage waveform to obtain the adjusted voltage threshold comprises: By performing time series analysis on the historical waveform data of the IGBT operating voltage, the variation law and trend characteristics of the historical waveform data are extracted; Based on the change trend of the voltage waveform, weighted averaging is performed on the historical waveform data to obtain an adjustment factor; Based on the variation rules and trend characteristics of the historical waveform data, the preset voltage threshold is adjusted using the adjustment factor to form the adjusted voltage threshold.

6. The IGBT abnormal voltage shutdown method based on DSP intelligent algorithm according to claim 1 is characterized in that: The triggering of the IGBT shutdown instruction and the reduction of the IGBT operating voltage to a preset safety range includes: When it is detected that the voltage waveform is determined to have an abnormal rising trend, a shutdown control signal is immediately generated; Transmitting the shutdown control signal to the driving circuit of the IGBT, triggering the IGBT shutdown instruction, and cutting off the current flow path in the driving circuit of the IGBT; If the IGBT operating voltage fails to drop to the preset safety range within a preset time period, an overvoltage protection mechanism is activated to increase the voltage drop rate of the IGBT operating voltage; After the IGBT is turned off, the current working state of the IGBT is determined through a feedback mechanism, a feedback result is generated, and the turn-off timing and restart strategy of the IGBT are adjusted according to the feedback result.

7. The IGBT abnormal voltage shutdown method based on DSP intelligent algorithm according to claim 1 is characterized in that: The dynamically adjusting voltage control strategy according to the change value of the IGBT operating voltage includes: Calculating the change data of the IGBT operating voltage according to the change value of the IGBT operating voltage, wherein the change data includes the amplitude, speed and trend of the voltage change; The voltage control strategy is dynamically adjusted according to the change data.

8. An IGBT abnormal voltage shutdown system based on DSP intelligent algorithm, characterized in that: The IGBT abnormal voltage shutdown system based on DSP intelligent algorithm comprises: A waveform acquisition module is used to acquire the voltage waveform of the IGBT working voltage in real time and transmit the voltage waveform to the DSP processing unit; A calculation module, used for calculating the voltage change rate and change trend of the voltage waveform according to the voltage waveform, wherein the voltage change rate includes a climbing rate and a falling rate; A judgment module, used for judging whether the voltage waveform has an abnormal rising trend based on a preset voltage threshold and a preset voltage change rate threshold; A shutdown module, configured to trigger an IGBT shutdown instruction if the voltage waveform is determined to have an abnormally rising trend, and reduce the IGBT operating voltage to a preset safety range; The restart module is used to trigger the IGBT restart instruction when the IGBT operating voltage reaches the preset safety range, and dynamically adjust the voltage control strategy according to the change value of the IGBT operating voltage.

Images