High-frequency transformer isolation control method and system of high-voltage power supply of electron beam welding machine

Abstract

The application provides a high-frequency transformer isolation control method and system of an electron beam welder high-voltage power supply, relates to the technical field of data processing, and comprises the following steps: generating a preset given reference signal in a reference signal modulation channel of a PWM controller, inputting a dynamic compensation amount into the reference signal modulation channel, correcting the amplitude and phase parameters of the preset given reference signal, and obtaining a composite reference modulation signal; inputting the composite reference modulation signal and a high-frequency triangular carrier signal into two input ends of a comparator for comparison, generating a switch modulation pulse; performing potential translation and power amplification on the switch modulation pulse, generating a safety control instruction, controlling the on and off timing of a power switch device in a half-bridge power conversion circuit, and realizing output response control of the electron beam welder high-voltage power supply. The application helps to improve the response accuracy and stability of the output of the electron beam welder high-voltage power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data processing, in particular to a high-frequency transformer isolation control method and system of an electron beam welding machine high-voltage power supply. BACKGROUND

[0002] In the application of electron beam welding machines, such as the repair welding of turbine blades in the aerospace field, the output stability of the high-voltage power supply is crucial; at present, the mainstream control scheme usually collects the voltage and current signals on the primary side of the high-frequency transformer for closed-loop feedback control; the control loop structure of this method is relatively simple, but the feedback information comes from the beginning of power transmission, and cannot directly reflect the real working state of the secondary side high-voltage generation loop (including the voltage doubling rectifier circuit) under dynamic load; especially when welding components such as blade tenons with complex three-dimensional curved surface characteristics, the beam load will change rapidly with the unevenness of the workpiece surface in the scanning and weld tracking process of the electron beam. This rapid load fluctuation will cause instantaneous disturbances of voltage and current in the secondary side high-voltage loop through transformer coupling; since the existing primary side control method cannot directly sense these instantaneous disturbances on the secondary side, the control response may have a certain lag, resulting in a small drop or overshoot of the output high voltage; this phenomenon may adversely affect the stability of the electron beam spot, and thus affect the consistency of the final weld penetration. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a high-frequency transformer isolation control method and system of an electron beam welding machine high-voltage power supply, which helps to improve the response accuracy and stability of the output of the electron beam welding machine high-voltage power supply.

[0004] To solve the above technical problems, the technical solutions of the present application are as follows:

[0005] In the first aspect, a high-frequency transformer isolation control method of an electron beam welding machine high-voltage power supply, the method comprising:

[0006] Step 1: In the high-voltage generation and output main loop on the secondary side of the high-frequency transformer, three critical working nodes are selected, which are the high-voltage output end of the secondary winding, the intermediate capacitor connection point in the voltage doubling rectifier circuit, and the output end of the final DC high-voltage, and the output voltage instantaneous value and output current instantaneous value of the three critical working nodes are collected to obtain electrical parameter samples;

[0007] Step 2: Based on the electrical parameter samples, a dynamic running state vector is constructed in a preset two-dimensional running state plane with voltage and current as coordinate axes to generate a characteristic polygon;

[0008] Step 3: The characteristic polygon is geometrically divided to generate state sub-regions, and the corresponding electrical performance quantization index set is calculated according to the state sub-regions.

[0009] Step 4, the electrical performance index set is fused to generate a dynamic compensation amount;

[0010] Step 5, a preset given reference signal is generated in a reference signal modulation channel of a PWM controller, the dynamic compensation amount is input into the reference signal modulation channel, the amplitude and phase parameters of the preset given reference signal are corrected to obtain a composite reference modulation signal;

[0011] Step 6, the composite reference modulation signal and a high-frequency triangular carrier signal are input into two input ends of a comparator to generate a switching modulation pulse;

[0012] Step 7, the switching modulation pulse is subjected to potential translation and power amplification to generate a safety control instruction, and the on and off timing of a power switching device in a half-bridge power conversion circuit is controlled to realize output response control of the electron beam welder high-voltage power supply.

[0013] In a second aspect, a high-frequency transformer isolation control system of an electron beam welder high-voltage power supply includes:

[0014] The acquisition module is configured to select three critical working nodes in a high-voltage generation and output main loop on a secondary side of a high-frequency transformer, i.e., a high-voltage output end of a secondary winding, a connection point of an intermediate capacitor in a voltage doubling rectifier circuit, and an output end of a final DC high voltage, and to acquire output voltage instantaneous values and output current instantaneous values of the three critical working nodes to obtain electrical parameter samples.

[0015] The construction module is configured to construct a dynamic running state vector in a preset two-dimensional running state plane with voltage and current as coordinate axes based on the electrical parameter samples to generate a characteristic polygon.

[0016] The calculation module is configured to perform geometric subdivision on the characteristic polygon to generate state sub-regions, and to calculate corresponding electrical performance index sets according to the state sub-regions.

[0017] The fusion module is configured to fuse the electrical performance index sets to generate a dynamic compensation amount.

[0018] The correction module is configured to generate a preset given reference signal in a reference signal modulation channel of a PWM controller, to input the dynamic compensation amount into the reference signal modulation channel, to correct amplitude and phase parameters of the preset given reference signal, and to obtain a composite reference modulation signal.

[0019] The generation module is configured to input the composite reference modulation signal and a high-frequency triangular carrier signal into two input ends of a comparator to generate a switching modulation pulse.

[0020] The control module is used for potential shifting and power amplification of the switch modulation pulse, generating a safety control instruction, and controlling the on and off timing of the power switch device in the half-bridge power conversion circuit, so as to realize the output response control of the electron beam welding machine high-voltage power supply.

[0021] In a third aspect, a computing device includes:

[0022] one or more processors;

[0023] a memory device storing one or more programs, when the one or more programs are executed by the one or more processors, so that the one or more processors implement the method.

[0024] In a fourth aspect, a computer readable storage medium stores a program, when the program is executed by a processor, the method is implemented.

[0025] The above scheme of the present application at least includes the following beneficial effects:

[0026] By collecting the voltage and current instantaneous values of the multi-critical node, more comprehensive electrical parameter samples can be obtained to provide accurate data support for the control strategy; in combination with dynamic modeling and feature polygon subdivision of the two-dimensional operation state plane, the power supply operation state can be more accurately captured, and then the dynamic compensation amount generated by the quantitative index fusion is used to correct the amplitude and phase of the reference signal, which helps to improve the accuracy and stability of the output response of the high-voltage power supply; the safety control instruction processed by potential shifting and power amplification can optimize the switching timing control of the half-bridge power conversion circuit, improve the overall electrical performance of the power supply, and enhance the safety protection capability during operation. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a high-frequency transformer isolation control method flowchart of the electron beam welding machine high-voltage power supply provided by the embodiment of the present application.

[0028] Figure 2 It is a high-frequency transformer isolation control system schematic diagram of the electron beam welding machine high-voltage power supply provided by the embodiment of the present application. DETAILED DESCRIPTION

[0029] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings; however, they are not limited to the embodiments set forth herein but can be implemented in various forms. The embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0030] As Figure 1As shown, the embodiment of the present application proposes a high-frequency transformer isolation control method of the high-voltage power supply of the electron beam welder, and the method comprises the following steps:

[0031] Step 1, in the high-voltage generation and output main circuit of the secondary side of the high-frequency transformer, three critical working nodes are selected, which are the high-voltage output end of the secondary winding, the intermediate capacitor connection point in the voltage doubling rectifier circuit and the output end of the final DC high voltage, and the output voltage instantaneous value and the output current instantaneous value of the three critical working nodes are collected to obtain the electrical parameter sample;

[0032] Step 2, based on the electrical parameter sample, a dynamic running state vector is constructed in a preset two-dimensional running state plane with voltage and current as coordinate axes to generate a characteristic polygon;

[0033] Step 3, the characteristic polygon is geometrically divided to generate a state sub-region, and a corresponding electrical performance quantization index set is calculated according to the state sub-region;

[0034] Step 4, the electrical performance quantization index set is fused to generate a dynamic compensation amount;

[0035] Step 5, a preset given reference signal is generated in the reference signal modulation channel of the PWM controller, the dynamic compensation amount is input into the reference signal modulation channel, the amplitude and phase parameters of the preset given reference signal are corrected to obtain a composite reference modulation signal;

[0036] Step 6, the composite reference modulation signal and the high-frequency triangular carrier signal are input into the two input ends of the comparator for comparison to generate a switching modulation pulse;

[0037] Step 7, the switching modulation pulse is subjected to potential translation and power amplification to generate a safety control instruction, and the on and off timing of the power switching device in the half-bridge power conversion circuit is controlled to realize the output response control of the high-voltage power supply of the electron beam welder.

[0038] In the embodiment of the present application, through the voltage and current instantaneous value collection of multiple critical nodes, more comprehensive electrical parameter samples can be obtained to provide accurate data support for the control strategy; combined with the dynamic modeling of the two-dimensional running state plane and the characteristic polygon division, the power supply running state can be more accurately captured, and then the dynamic compensation amount generated by the quantization index fusion is used to correct the amplitude and phase of the reference signal, which helps to improve the accuracy and stability of the output response of the high-voltage power supply; through the safety control instruction processed by the potential translation and power amplification, the switching timing control of the half-bridge power conversion circuit can be optimized, the overall electrical performance of the power supply can be improved, and the safety guarantee capability in the running process can be enhanced.

[0039] In a preferred embodiment of the present application, in step 1, three critical working nodes are selected in the high-voltage generation and output main circuit of the secondary side of the high-frequency transformer, which are the high-voltage output end of the secondary winding, the intermediate capacitor connection point in the voltage doubling rectifier circuit, and the output end of the final DC high voltage, and the output voltage instantaneous value and output current instantaneous value of the three critical working nodes are collected to obtain electrical parameter samples, which specifically include: in combination with the actual working scene of the high-voltage generation and output of the secondary side of the electron beam welding machine high-voltage power supply, especially the characteristics of the load fluctuation in the precise scene such as aerospace turbine blade repair welding, three critical working nodes are determined in the high-voltage generation and output main circuit of the secondary side of the high-frequency transformer; the first node is the high-voltage output end of the secondary winding, which directly reflects the output state of the transformer secondary winding; the second node is the intermediate capacitor connection point in the voltage doubling rectifier circuit, which can reflect the energy conversion state in the voltage doubling rectification process; the third node is the output end of the final DC high voltage, which is directly related to the power supply stability of the electron gun; in order to accurately obtain the state of each node, high-precision voltage sensors and current sensors are respectively arranged at each critical working node, the voltage sensor selects a product with a measurement range of 0 to 150 kilovolts and an accuracy level of 0.1 level, and is connected in parallel across the node; the current sensor selects a product with a measurement range of 0 to 100 milliamperes and an accuracy level of 0.2 level, and is connected in series on the branch where the node is located; the output voltage instantaneous value and output current instantaneous value of each node are collected in real time by the sensor at a sampling frequency of 100 kilohertz to 200 kilohertz, and the collected voltage instantaneous value and current instantaneous value of the three nodes are correspondingly combined in the order of collection time to form electrical parameter samples containing time stamp, node identification, voltage instantaneous value, and current instantaneous value, wherein the time stamp has an accuracy of 1 microsecond.

[0040] In this embodiment,

[0041] In a preferred embodiment of the present application, in step 2, based on the electrical parameter samples, a dynamic running state vector is constructed in a pre-set two-dimensional running state plane with voltage and current as coordinate axes, and a feature polygon is generated, which can include:

[0042] In step 201, according to the electrical parameter samples, the voltage sample value and the current sample value at each critical working node are extracted respectively, and the voltage and current data pair of each node is mapped to a preset two-dimensional operating state plane to generate three corresponding state coordinate points. Specifically, from the collected electrical parameter samples, the voltage sample value and the current sample value at each critical working node are extracted according to the node identifier respectively, to ensure that the voltage sample value and the current sample value of each node correspond one by one and have the same time stamp. A two-dimensional operating state plane with voltage value as horizontal coordinate and current value as vertical coordinate is preset, the horizontal coordinate range is set to 0-150 kV, the vertical coordinate range is set to 0-100 mA, and the voltage and current data pair of each node is mapped to the two-dimensional operating state plane as a coordinate point, that is, the voltage sample value of each node is taken as the horizontal coordinate value, and the current sample value is taken as the vertical coordinate value, to generate three corresponding state coordinate points.

[0043] In step 202, the geometric center point coordinates of the three state coordinate points are calculated according to the spatial distribution of the three state coordinate points in the two-dimensional operating state plane. The polar angle parameter of each state coordinate point relative to the geometric center point is calculated according to the relative position relationship between the geometric center point coordinates and each state coordinate point. Specifically, the geometric center point coordinates of the three state coordinate points are calculated according to the spatial distribution of the three state coordinate points in the two-dimensional operating state plane. The calculation method is to add the horizontal coordinate values of the three state coordinate points to obtain a horizontal coordinate sum, and divide the horizontal coordinate sum by three to obtain the horizontal coordinate of the geometric center point. The vertical coordinate values of the three state coordinate points are added to obtain a vertical coordinate sum, and the vertical coordinate sum is divided by three to obtain the vertical coordinate of the geometric center point. The polar angle parameter of each state coordinate point relative to the geometric center point is calculated according to the relative position relationship between the geometric center point coordinates and each state coordinate point. The calculation method is to subtract the horizontal coordinate of the geometric center point from the horizontal coordinate of each state coordinate point to obtain a horizontal deviation value, and to subtract the vertical coordinate of the geometric center point from the vertical coordinate of each state coordinate point to obtain a vertical deviation value. The polar angle is calculated by the arctangent function according to the scene. Specifically, when the horizontal deviation value is greater than 0, if the vertical deviation value is greater than or equal to 0, the angle corresponding to the ratio of the vertical deviation value to the horizontal deviation value is directly calculated by the arctangent function, which is the polar angle parameter, ranging from 0 degrees to 90 degrees. If the vertical deviation value is less than 0, the arctangent angle corresponding to the ratio of the vertical deviation value to the horizontal deviation value is first calculated, and then the angle is added by 360 degrees to obtain the polar angle parameter, ranging from 270 degrees to 360 degrees. When the horizontal deviation value is less than 0, regardless of the positive or negative of the vertical deviation value, the arctangent angle corresponding to the ratio of the vertical deviation value to the horizontal deviation value is first calculated, and then the angle is added by 180 degrees to obtain the polar angle parameter, ranging from 90 degrees to 270 degrees. When the horizontal deviation value is equal to 0, if the vertical deviation value is greater than 0, the polar angle parameter is directly set to 90 degrees. If the vertical deviation value is less than 0, the polar angle parameter is directly set to 270 degrees. The polar angle parameters obtained by the above method range from 0 degrees to 360 degrees.

[0044] Step 203, according to the polar angle parameter, the three state coordinate points are sorted in the clockwise direction, and an ordered vertex sequence is generated; according to the ordered vertex sequence, the vertices are connected in sequence to form a closed geometric structure, and a feature polygon is generated, which specifically comprises: when the horizontal deviation value is less than 0, no matter the vertical deviation value is positive or negative, first calculate the inverse tangent angle corresponding to the ratio of the vertical deviation value and the horizontal deviation value, then add 180 degrees to the angle to obtain the polar angle parameter, which is in the range of 90 degrees to 270 degrees; when the horizontal deviation value is equal to 0, if the vertical deviation value is greater than 0, the polar angle parameter is directly set to 90 degrees; if the vertical deviation value is less than 0, the polar angle parameter is directly set to 270 degrees; the polar angle parameter obtained by the above method is in the range of 0 degrees to 360 degrees; according to the calculated polar angle parameter, the three state coordinate points are sorted in the clockwise direction, and the ordered vertex sequence is generated according to the sorting rule that the polar angle parameter is arranged from large to small in sequence; according to the ordered vertex sequence, the adjacent vertices are connected in sequence from front to back, and finally the last vertex is connected with the first vertex to form a closed geometric structure, which is the feature polygon.

[0045] In this embodiment, the electrical parameters are mapped to a two-dimensional plane with a set range to form a feature polygon, the electrical operating state is converted into an intuitive geometric figure, the change of the system operating state can be directly reflected through the change of the figure form, and the system state change trend can be accurately identified.

[0046] In a preferred embodiment of the application, step 3, the feature polygon is geometrically divided to generate a state sub-region, and the corresponding electrical performance quantization index set is calculated according to the state sub-region, which can include:

[0047] Step 301, according to the ordered vertex sequence of the feature polygon, the coordinate values of each vertex in the two-dimensional running state plane are obtained in turn; according to the coordinate values, the product of the horizontal coordinate of each vertex and the vertical coordinate of the next vertex is calculated in turn according to the vertex order to obtain the first group of product sequences; according to the coordinate values, the product of the vertical coordinate of each vertex and the horizontal coordinate of the next vertex is calculated in turn according to the vertex order to obtain the second group of product sequences, which specifically includes: from the generated ordered vertex sequence of the feature polygon, the horizontal coordinate value and the vertical coordinate value of each vertex in the two-dimensional running state plane are extracted in turn, and the complete coordinate value of each vertex is determined; according to the extracted coordinate values of each vertex, the first group of product sequences is calculated in turn according to the order of the vertices in the ordered sequence, and the calculation method is to take the horizontal coordinate value of the current vertex multiplied by the vertical coordinate value of the next vertex in the ordered sequence, when the last vertex is calculated, the horizontal coordinate value of the last vertex is multiplied by the vertical coordinate value of the first vertex, three product values are calculated in turn, which form the first group of product sequences; the second group of product sequences is calculated in turn according to the same vertex order, and the calculation method is to take the vertical coordinate value of the current vertex multiplied by the horizontal coordinate value of the next vertex in the ordered sequence, when the last vertex is calculated, the vertical coordinate value of the last vertex is multiplied by the horizontal coordinate value of the first vertex, three product values are calculated in turn, which form the second group of product sequences.

[0048] Step 302, according to the cumulative sum of each product value in the first group of product sequences and the cumulative sum of each product value in the second group of product sequences, the difference between the two cumulative sums is calculated, and the absolute value of the difference is taken and divided by two to obtain the total area parameter of the feature polygon, which specifically includes: calculating the cumulative sum of each product value in the first group of product sequences, that is, the sum of the three product values to obtain the first cumulative sum; calculate the cumulative sum of each product value in the second group of product sequences, that is, the sum of the three product values to obtain the second cumulative sum; the difference is obtained by subtracting the second cumulative sum from the first cumulative sum, the absolute value of the difference is taken, and the absolute value is divided by two to obtain the total area parameter of the feature polygon, which ranges from 0 to 15000 kilovolts·milliampere.

[0049] Step 303, according to the total area parameter of the feature polygon and the coordinate values of each vertex, the weighted average value of each vertex coordinate is calculated respectively to obtain the barycentric coordinate of the feature polygon; according to the barycentric coordinate of the feature polygon, the barycenter is connected with each vertex of the feature polygon respectively, and the feature polygon is divided into multiple triangular sub-regions, which specifically includes: according to the total area parameter of the feature polygon and the coordinate values of each vertex, the weighted average value of each vertex coordinate is calculated to obtain the barycentric coordinate of the feature polygon, and the calculation method is that the horizontal coordinate value of each vertex is multiplied by the weight corresponding to the vertex, the horizontal coordinate weighted values of all vertices are added to obtain the barycentic horizontal coordinate sum, and the barycentic horizontal coordinate sum is divided by the total area parameter to obtain the horizontal coordinate of the barycenter; the vertical coordinate value of each vertex is multiplied by the weight corresponding to the vertex, the vertical coordinate weighted values of all vertices are added to obtain the barycentric vertical coordinate sum, and the barycentric vertical coordinate sum is divided by the total area parameter to obtain the vertical coordinate of the barycenter, wherein the weight of each vertex is set according to the influence degree of the node where the vertex is located on the high-voltage output stability, and finally the weight of the vertex corresponding to the direct current high-voltage output end is set to 0.5, the weight of the vertex corresponding to the secondary winding high-voltage output end is set to 0.3, and the weight of the vertex corresponding to the intermediate capacitor connection point in the voltage doubling rectifier circuit is set to 0.2; according to the calculated barycentric coordinate of the feature polygon, the barycenter is connected with each vertex of the feature polygon respectively by straight lines, and these straight lines divide the feature polygon into three triangular sub-regions, each of which corresponds to a triangle formed by a critical working node and the barycenter.

[0050] Step 304, according to the three vertex coordinates of each triangular sub-region, the area parameter of each triangular sub-region is calculated respectively; according to the three vertex coordinates of each triangular sub-region, the line segment length of three edges is calculated respectively, and the line segment length of three edges is added to obtain the perimeter parameter of each triangular sub-region, which specifically includes: according to the three vertex coordinates of each triangular sub-region, the area parameter of each triangular sub-region is calculated respectively, and the calculation method is that any one vertex of the triangle is taken as a reference vertex, the horizontal coordinates of the other two vertices are subtracted from the horizontal coordinate of the reference vertex to obtain two horizontal edge lengths, the vertical coordinates of the other two vertices are subtracted from the vertical coordinate of the reference vertex to obtain two vertical edge lengths, the product of the two horizontal edge lengths is added to the product of the two vertical edge lengths, and half of the result is taken as the area parameter of the triangular sub-region, which ranges from 0 to 5000 kilovolts·milliamperes; according to the three vertex coordinates of each triangular sub-region, the line segment length of three edges is calculated respectively, and the calculation method is that the horizontal distance is obtained by subtracting the horizontal coordinate of one end point from the horizontal coordinate of the other end point, the vertical distance is obtained by subtracting the vertical coordinate of one end point from the vertical coordinate of the other end point, the square sum is obtained by adding the square of the horizontal distance to the square of the vertical distance, and the line segment length of the edge is obtained by taking the square root of the square sum, and the perimeter parameter of each triangular sub-region is obtained by adding the line segment length of three edges, which ranges from 0 to 300 kilovolts·milliamperes.

[0051] Step 305, according to the area parameter and the perimeter parameter of each triangular sub-region, the area perimeter ratio of each triangular sub-region is calculated, and according to the area perimeter ratio of each triangular sub-region, the preset electrical performance conversion coefficient is combined to obtain the electrical performance quantitative index set, specifically including: according to the area parameter and the perimeter parameter of each triangular sub-region, the area perimeter ratio of each triangular sub-region is calculated, and the calculation method is to divide the area parameter of each triangular sub-region by the perimeter parameter of the region to obtain the area perimeter ratio, and the ratio ranges from 0 to 100 kilovolts·milliamperes / (kilovolts+milliamperes); according to the area perimeter ratio of each triangular sub-region, the preset electrical performance conversion coefficient is combined to obtain the electrical performance quantitative index set, and the calculation method is to multiply the area perimeter ratio of each region by the corresponding electrical performance conversion coefficient, wherein the ripple coefficient corresponding conversion coefficient is set to 0.001-0.005 according to the ripple characteristic of the voltage doubling rectifier circuit, and the power loss parameter corresponding conversion coefficient is set to 0.01-0.05 according to the loss characteristic of the high-frequency transformer, and finally the electrical performance quantitative index set containing the ripple coefficient and the power loss parameter is obtained.

[0052] In this embodiment, by setting an explicit weight for feature polygon subdivision, the geometric parameters are converted into electrical performance quantitative indexes by combining the conversion coefficient in a specific range, and the precise evaluation of the system electrical performance is realized, and the stability of the high-voltage power supply output is ensured.

[0053] In a preferred embodiment of the present application, step 4, the electrical performance quantitative index set is fused to generate a dynamic compensation amount, which can include:

[0054] In step 401, according to the set of electrical performance quantification indexes, the ripple coefficient and the power loss parameter of each state sub-region are extracted to generate an original parameter set; according to the numerical range of each parameter in the original parameter set, the ripple coefficient and the power loss parameter are normalized to obtain a normalized parameter set, which specifically includes: from the set of electrical performance quantification indexes obtained in step 3, according to the corresponding relationship of the three state sub-regions, the ripple coefficient and the power loss parameter of each sub-region are extracted, the ripple coefficient and the power loss parameter of the three sub-regions are summarized to generate an original parameter set containing six parameters; in combination with the working characteristics of the electron beam welding machine high-voltage power supply, the numerical range of each parameter in the original parameter set is determined in advance, the preset range of the ripple coefficient is 0.001 to 0.01, wherein for the aerospace precision welding scene, the actual control target range is 0.002 to 0.008; the preset range of the power loss parameter is 50 watts to 200 watts, different power levels of the high-voltage power supply correspond to different sub-ranges, the 100-kilovolt power supply corresponds to 80 watts to 150 watts, and the 150-kilovolt power supply corresponds to 100 watts to 180 watts; each ripple coefficient in the original parameter set is normalized, the processing method is to subtract the minimum value 0.001 of the preset ripple coefficient range from the ripple coefficient, and the difference is divided by the difference 0.009 between the maximum value 0.01 of the preset ripple coefficient range and the minimum value 0.001, the calculation result is the normalized value of the ripple coefficient, and the normalized range is 0 to 1; each power loss parameter in the original parameter set is normalized, the processing method is to subtract the minimum value 50 watts of the preset power loss range from the power loss parameter, and the difference is divided by the difference 150 watts between the maximum value 200 watts of the preset power loss range and the minimum value 50 watts, the calculation result is the normalized value of the power loss parameter, and the normalized range is 0 to 1; all the normalized ripple coefficients and power loss parameters are summarized to obtain the normalized parameter set.

[0055] Step 402, according to the importance of the parameters in the normalized parameter set, the ripple coefficient weight value and the power loss weight value are determined; according to the normalized ripple coefficient and the normalized power loss in the normalized parameter set, the weighted performance index is calculated combined with the corresponding ripple coefficient weight value and the power loss weight value, specifically including: combining the high requirement of aerospace turbine blade repair welding on the output stability of the high-voltage power supply, the importance of each parameter in the normalized parameter set is determined, the ripple coefficient directly affects the output voltage stability and has a greater impact on the welding quality, therefore the value range of the ripple coefficient weight value is set to 0.5 to 0.7, the value range of the power loss parameter weight value is set to 0.3 to 0.5, and the sum of the weight values is always 1; for precise welding scenes such as turbine blade repair, the ripple coefficient weight value is selected as 0.6 and the power loss parameter weight value is selected as 0.4, and for ordinary welding scenes, the ripple coefficient can be adjusted to 0.5 and the power loss can be adjusted to 0.5; the normalized ripple coefficient and the normalized power loss corresponding to each state sub-region are extracted from the normalized parameter set, and the weighted performance score of each sub-region is calculated, the calculation method is that the normalized ripple coefficient of the sub-region is multiplied by the ripple coefficient weight value 0.6 to obtain the ripple weighted value; the normalized power loss of the sub-region is multiplied by the power loss weight value 0.4 to obtain the loss weighted value; the ripple weighted value is added to the loss weighted value to obtain the weighted performance score of the sub-region, and the weighted performance score of each sub-region ranges from 0 to 1; the weighted performance scores of the three sub-regions are added together, and the sum is divided by three, and the calculation result is the weighted performance index, and the index range is 0 to 1.

[0056] Step 403, according to the weighted performance index, the comprehensive performance index is calculated; according to the comparison between the comprehensive performance index and the preset performance target reference value, the performance deviation amount is obtained, specifically including: according to the weighted performance index obtained in step 402, the comprehensive performance index is calculated combined with the parameter distribution uniformity of the three state sub-regions, and the calculation method is that the weighted performance index is multiplied by the parameter distribution uniformity coefficient, wherein the parameter distribution uniformity coefficient is calculated by the weighted performance scores of the three sub-regions, first, the standard deviation of the weighted performance scores of the three sub-regions is calculated, the calculation method is that the weighted performance score of each sub-region is subtracted from the weighted performance index to obtain a deviation value, each deviation value is squared and then added to obtain a sum of squares, the sum of squares is divided by three to obtain a variance, and the square root of the variance is obtained to obtain the standard deviation; the parameter distribution uniformity coefficient is obtained by subtracting the ratio of the standard deviation to the weighted performance index from 1, and the coefficient range is 0.5 to 1; the performance target reference value is preset, and the reference value is determined according to the optimal working state of the electron beam welder in different welding scenes, and the value range is 0.8 to 0.9, wherein the precision welding scene is set to 0.85 and the ordinary welding scene can be set to 0.8; the difference between the calculated comprehensive performance index and the preset performance target reference value 0.85 is the performance deviation amount.

[0057] At step 404, according to the performance deviation amount, a preliminary dynamic compensation amount is generated by calculation, and the preliminary dynamic compensation amount is subjected to boundary constraint processing according to a preset compensation amount boundary condition to generate a dynamic compensation amount, which specifically includes: according to the performance deviation amount obtained at step 403, a preliminary dynamic compensation amount is calculated in combination with a proportional adjustment coefficient, the proportional adjustment coefficient is set according to the dynamic response characteristics of the high-voltage power supply, and the value range is 0.4 to 0.6, which ensures that the target performance can be quickly approached after compensation, and the proportional adjustment coefficient is selected as 0.5 for the precision welding scene of rapid load fluctuation, and 0.4 can be selected if the load is stable; the calculation method is to multiply the performance deviation amount by the proportional adjustment coefficient 0.5 to obtain the preliminary dynamic compensation amount; the compensation amount boundary condition is preset, the adjustment capability of the PWM controller and the working safety range of the high-voltage power supply are combined, the value range of the preset reference signal amplitude is 2.5 volts to 3.5 volts, the boundary range of the amplitude compensation component is negative 5% to positive 5% of the preset reference signal amplitude, that is, the single-polarity compensation range is negative 0.175 volts to positive 0.175 volts; the boundary range of the phase compensation component is set to negative 10 degrees to positive 10 degrees, and can be reduced to negative 5 degrees to positive 5 degrees for a high-frequency scene; the preliminary dynamic compensation amount is decomposed into an amplitude compensation component and a phase compensation component, and the decomposition ratio is set according to the power supply characteristics as amplitude ratio 60% and phase ratio 40, and whether the two components are within the corresponding boundary range is checked respectively, if the amplitude compensation component exceeds the boundary, it is adjusted to the nearest boundary value; if the phase compensation component exceeds the boundary, it is adjusted to the nearest boundary value; the compensation amount after the boundary constraint processing is the final dynamic compensation amount.

[0058] In this embodiment, by setting a grading parameter range for the electrical performance index and normalizing the processing, combining an adjustable weight range to adapt to different welding scenes, and then generating a dynamic compensation amount through boundary constraint, the compensation adjustment is more in line with the actual performance demand, and the accuracy and scene adaptability of the adjustment are improved.

[0059] In a preferred embodiment of the application, at step 5, a preset given reference signal is generated in the reference signal modulation channel of the PWM controller, the dynamic compensation amount is input into the reference signal modulation channel, and the amplitude and phase parameters of the preset given reference signal are corrected to obtain a composite reference modulation signal, which can include:

[0060] Step 501, according to the dynamic compensation, the dynamic compensation is separated into amplitude compensation component and phase compensation component; according to the amplitude parameter of the preset given reference signal and the amplitude compensation component, the corrected reference signal amplitude parameter is calculated, specifically including: according to the dynamic compensation, the amplitude compensation component and the phase compensation component are split according to the preset component separation rule, the first 60% of the compensation amount is the amplitude compensation component, and the last 40% of the compensation amount is the phase compensation component, and the two are identified by comma separation, and are directly split in proportion when extracted; a preset given reference signal is generated in the reference signal modulation channel of the PWM controller, the signal is a sine wave signal, the preset amplitude parameter is set according to the rated output requirement of the electron beam welder high-voltage power supply, the value range is 2.5 volts to 3.5 volts, 3 volts for 100 kilovolt power supply, and 3.5 volts for 150 kilovolt power supply; the frequency setting range is 45 Hz to 55 Hz, and 50 Hz is usually selected; the corrected reference signal amplitude parameter is calculated, and the calculation method is to add the amplitude compensation component to the amplitude parameter 3 volts of the preset given reference signal, if the calculation result is negative, the absolute value is taken to recalculate, to ensure that the amplitude parameter is positive, and the corrected amplitude range is 2.825 volts to 3.175 volts.

[0061] Step 502, according to the preset given reference signal phase parameter and the phase compensation component, the corrected reference signal phase parameter is calculated; the corrected reference signal amplitude parameter and the corrected reference signal phase parameter are processed to generate a new reference signal waveform sequence, specifically including: the initial phase parameter of the preset given reference signal is set to 0 degrees, the corrected reference signal phase parameter is calculated according to the phase compensation component separated in step 501, and the calculation method is to add the phase compensation component to the initial phase parameter 0 degrees, if the calculation result is greater than 360 degrees, subtract 360 degrees, if it is less than 0 degrees, add 360 degrees, to ensure that the phase parameter is in the range of 0 degrees to 360 degrees; according to the corrected amplitude parameter and the phase parameter, a new reference signal waveform sequence is generated according to the preset sampling frequency, the sampling frequency setting range is 90 kHz to 110 kHz, 100 kHz is selected to balance accuracy and efficiency, the number of sampling points collected in each period is the sampling frequency divided by the signal frequency, that is, 100 kHz divided by 50 kHz to get 2000 sampling points; the voltage value of each sampling point is calculated by a sine function, that is, the voltage value is equal to the corrected amplitude parameter multiplied by the sine function value, the angle of the sine function is the corrected phase parameter plus the angle increment corresponding to the sampling point, and the angle increment is 360 degrees divided by the number of sampling points in each period 2000, which is 0.18 degrees.

[0062] Step 503, the new reference signal waveform sequence is fused with the original preset given reference signal to obtain a preliminary composite reference modulation signal; the preliminary composite reference modulation signal is processed to obtain a composite reference modulation signal, specifically including: the new reference signal waveform sequence generated in step 502 is fused with the waveform sequence of the original preset given reference signal, the fusion mode is to take the average value of the voltage values of the corresponding sampling points in the two sequences to obtain a preliminary composite reference modulation signal waveform sequence, and if the new reference signal needs to be adjusted, the new reference signal ratio is 60%, and the original reference ratio is 40%; the preliminary composite reference modulation signal is filtered, a passive RC low-pass filter is used to remove high-frequency noise, the cutoff frequency of the filter is set to a range of 8 kHz to 12 kHz, 10 kHz is selected to match the signal frequency characteristics, the resistance value is selected in a range of 1 kΩ to 10 kΩ, the capacitance value is selected in a range of 1 nF to 10 nF, and 1.6 kΩ resistance and 10 nF capacitance are selected corresponding to the 10 kHz cutoff frequency. The preliminary composite reference modulation signal is input into the low-pass filter, and the signal obtained after filtering is the composite reference modulation signal, and the signal ripple amplitude can be controlled within 0.01 V.

[0063] In this embodiment, by splitting the compensation component to correct the amplitude and phase of the reference signal respectively, the waveform fusion is performed by matching the optimal sampling frequency and filter parameters, and the adaptability of the reference signal to the system state change is enhanced.

[0064] In a preferred embodiment of the present application, step 6, the composite reference modulation signal and the high-frequency triangular carrier signal are input into two input ends of a comparator to generate a switching modulation pulse, which can include:

[0065] Step 601, according to the composite reference modulation signal and the preset high frequency triangular carrier signal parameters, the instantaneous voltage value sequence of the composite reference modulation signal is obtained, and the corresponding high frequency triangular carrier signal waveform is generated, specifically including: according to the composite reference modulation signal obtained in step 5, the voltage value thereof is collected at a sampling frequency of 100 kilohertz, to obtain the instantaneous voltage value sequence of the composite reference modulation signal, each sampling point corresponds to an instantaneous voltage value and a time stamp, and the time stamp accuracy is 10 nanoseconds; the preset high frequency triangular carrier signal parameters, the frequency setting range is 90 kilohertz to 110 kilohertz, and 100 kilohertz is selected to be consistent with the sampling frequency; the amplitude setting range is 0 volt to 5.5 volts, and 0 volt to 5 volts is selected to match the comparator input range; the rising edge time and the falling edge time are equal, and the duty cycle is 50%; the slope of the rising edge and the falling edge is the amplitude divided by the half cycle time, that is, 5 volts divided by 5 microseconds to get 1 volt per microsecond; according to the preset parameters, the corresponding high frequency triangular carrier signal waveform is generated, which linearly rises from 0 volt to 5 volt in each period, and then linearly drops from 5 volt to 0 volt; 2000 sampling points are collected in each period to form the instantaneous voltage value sequence of the high frequency triangular carrier, and the voltage difference between adjacent sampling points is 0.0025 volts.

[0066] Step 602, according to the instantaneous voltage value sequence of the composite reference modulation signal and the high frequency triangular carrier signal waveform, the real-time voltage comparison calculation is performed through the comparator to obtain the corresponding high-low level state signal, specifically including: the comparator compares the generated high-low level signal in real time, specifically including: the instantaneous voltage value sequence of the composite reference modulation signal obtained in step 601 and the instantaneous voltage value sequence of the high frequency triangular carrier signal are input into the two input ends of the comparator according to the time stamp one by one, the composite reference modulation signal is connected to the non-inverting input end of the comparator, and the high frequency triangular carrier signal is connected to the inverting input end of the comparator; the comparator compares the voltage values of the two input ends in real time, when the instantaneous voltage value of the composite reference modulation signal is greater than the instantaneous voltage value of the high frequency triangular carrier signal, the comparator outputs a high level signal, and the high level voltage value is set to 5 volts; when the instantaneous voltage value of the composite reference modulation signal is less than or equal to the instantaneous voltage value of the high frequency triangular carrier signal, the comparator outputs a low level signal, and the low level voltage value is set to 0 volts, thereby generating the corresponding high-low level state signal.

[0067] Step 603, according to the high and low level state signal, detect all the jump moments of the output state of the comparator, generate a level jump time sequence; according to the level jump time sequence, calculate the duration parameter of the high level state in each signal period, generate a switch modulation pulse sequence, specifically including: real-time monitoring of the high and low level state signal obtained in step 602, detecting all the jump moments of the output state from high level to low level or from low level to high level, recording the time stamp of each jump moment, and generating a level jump time sequence. According to the level jump time sequence, determine the starting time and ending time of each signal period, and each signal period is 10 microseconds; in each signal period, find the starting jump moment and the ending jump moment corresponding to the high level state, subtract the time stamp of the starting jump moment from the time stamp of the ending jump moment to obtain the duration parameter of the high level state in each signal period; according to the high level duration parameter of each period, generate the corresponding switch modulation pulse sequence, and the high level duration is the pulse width, and the low level duration is the signal period minus the pulse width.

[0068] Step 604, according to the switch modulation pulse sequence, verify whether the pulse width parameter meets the preset pulse width safety constraint condition, generate a switch modulation pulse, specifically including: preset pulse width safety constraint condition, the minimum pulse width is set to 1-2 microseconds, and the maximum pulse width is set to 8-9 microseconds, so as to ensure that the power switch device has enough switching time and avoid damage, and the minimum pulse width is 1 microsecond and the maximum pulse width is 9 microsecond for commonly used IGBT power devices; from the switch modulation pulse sequence obtained in step 603, extract the width parameter of each pulse, and compare it with the preset pulse width safety constraint condition; if the pulse width is within 1-9 microseconds, it is determined that the pulse is qualified; if the pulse width is less than 1 microsecond, it is adjusted to 1 microsecond; if the pulse width is greater than 9 microseconds, it is adjusted to 9 microseconds; at the same time, additionally verify whether the pulse period is 10 microseconds, and if the period deviation exceeds 0.1 microsecond, it is determined to be abnormal and is regenerated. Arrange all qualified pulses in time sequence to obtain the final switch modulation pulse.

[0069] In this embodiment, the potential translation is realized by the specified model of optical coupling isolation, the safety control instruction is generated by the amplification circuit and the timing verification circuit with the specified number of stages and the specified model of device, the reliability of the control signal and the safe operation of the power device are guaranteed, and finally the output stability of the high-voltage power supply under the load fluctuation scene is improved.

[0070] In a preferred embodiment of the application, step 7, the switch modulation pulse is subjected to potential translation and power amplification to generate a safety control instruction, and the conduction and turn-off timing of the power switch device in the half-bridge power conversion circuit is controlled to realize the output response control of the electron beam welding machine high-voltage power supply, which can include:

[0071] Step 701, based on the switch modulation pulse, the pulse signal is converted from the control circuit potential reference point to the floating potential reference point required by the power switch device, and the potential translated pulse signal is generated; based on the potential translated pulse signal, the current driving capability of the pulse signal is improved through the multi-stage push-pull amplification circuit, and the power enhanced pulse signal is generated, specifically including: based on the switch modulation pulse, the potential translation is realized through the optical coupling isolation circuit, the high-speed optical coupling type 6N137 is selected, the transmission rate can reach 10 megabits per second, and the isolation voltage is 2500 volts, which can meet the demand of high voltage isolation; the pulse signal is converted from the 0-volt potential reference point of the control circuit to the floating potential reference point required by the power switch device, and the floating potential reference point is set according to the topology structure of the half-bridge power conversion circuit. The bus voltage is valued in the range of 300 volts to 600 volts, the floating potential reference point of the upper bridge arm power device is half of the bus voltage, that is, 150 volts to 300 volts, and the lower bridge arm is 0 volts. Thus, the potential translated pulse signal is generated, and the amplitude is kept at 5 volts; based on the potential translated pulse signal, the current driving capability of the pulse signal is improved through the three-stage push-pull amplification circuit, the first stage adopts the push-pull circuit composed of NPN triode S9013 and PNP triode S9012, and the output current can reach 100 milliamperes; the second and third stages adopt the push-pull circuit composed of power field effect tube IRF3205, and the output current of each stage can reach 10 amperes; after three-stage amplification, the output current of the pulse signal is improved from milliamperes to more than 10 amperes, and the power enhanced pulse signal is generated, which ensures that the power switch device can be turned on and off.

[0072] Step 702, based on the power enhancement pulse signal, generate half-bridge complementary control signal combined with the preset safety interval time parameter; based on the half-bridge complementary control signal, detect the time relationship of the upper and lower bridge arm control signals through the timing verification circuit to generate a safety control instruction, specifically including: based on the power enhancement pulse signal obtained in step 701, generate a half-bridge complementary control signal combined with a preset safety interval time parameter, the safety interval time is set to 1.5 microseconds to 2.5 microseconds, 2 microseconds is selected according to the turn-off time of the power switching device, which is used to prevent the upper and lower bridge arm power devices of the half-bridge power conversion circuit from being turned on at the same time; generate the upper and lower bridge arm control signals, when the power enhancement pulse signal is high, the upper bridge arm control signal is high, and the lower bridge arm control signal becomes low after a delay of 2 microseconds of the safety interval time; when the power enhancement pulse signal is low, the lower bridge arm control signal is high, and the upper bridge arm control signal becomes low after a delay of 2 microseconds of the safety interval time; input the generated half-bridge complementary control signal into the timing verification circuit, the timing verification circuit uses a high-speed comparator LM311 to detect whether the upper and lower bridge arm control signals exist at the same time high level, the detection response time is less than 100 nanoseconds; if there is no simultaneous high level, the control signal is directly output as a safety control instruction; if there is, immediately set the upper and lower bridge arm control signals to low, and send a fault prompt signal through the alarm circuit, and generate a safety control instruction after troubleshooting.

[0073] Step 703, based on the safety control instruction, control the alternating conduction and turn-off operation of the upper and lower power switching devices in the half-bridge power conversion circuit to complete the output response control of the electron beam welder high-voltage power supply, specifically including: based on the safety control instruction obtained in step 702, input the upper bridge arm control signal into the gate drive circuit of the upper bridge arm power switching device of the half-bridge power conversion circuit, and input the lower bridge arm control signal into the gate drive circuit of the lower bridge arm power switching device, the power switching device selects IGBT type FF450R12KE4, rated current 450 amperes, rated voltage 1200 volts; when the upper bridge arm control signal is high, the upper bridge arm IGBT is turned on, and the lower bridge arm IGBT is turned off, the high-frequency transformer primary side is connected to the bus voltage, and the bus voltage is selected in the range of 300 volts to 600 volts; when the lower bridge arm control signal is high, the lower bridge arm IGBT is turned on, and the upper bridge arm IGBT is turned off, the high-frequency transformer primary side is connected to the ground; through the alternating conduction and turn-off operation of the upper and lower IGBTs, the voltage on-off state of the high-frequency transformer primary side is changed, the high-frequency transformer turns ratio range is 1 to 100 to 1 to 200, according to the output high-voltage demand, select the corresponding turns ratio, and then adjust the high-voltage output of the secondary side, realize the output response control of the electron beam welder high-voltage power supply, and ensure that the output voltage can be quickly stabilized when the load fluctuates.

[0074] The embodiment realizes potential translation through model light coupling isolation, generates safe control instructions through an amplification circuit and a timing verification circuit with a specified number of stages and a device model, guarantees the reliability of the control signal and the safe operation of the power device, and improves the output stability of the high-voltage power supply under a load fluctuation scenario.

[0075] As shown in Figure 2 The embodiment of the present application also provides a high-frequency transformer isolation control system of a high-voltage power supply of an electron beam welding machine, and the system comprises:

[0076] The acquisition module is configured to select three critical working nodes in a high-voltage generation and output main loop on a secondary side of the high-frequency transformer, the three critical working nodes being a high-voltage output end of a secondary winding, a connection point of an intermediate capacitor in a voltage doubling rectifier circuit, and an output end of a final direct-current high voltage, and the acquisition module is configured to acquire output voltage instantaneous values and output current instantaneous values of the three critical working nodes to obtain electrical parameter samples.

[0077] The construction module is configured to construct a dynamic running state vector in a preset two-dimensional running state plane with voltage and current as coordinate axes based on the electrical parameter samples, and generate a feature polygon.

[0078] The calculation module is configured to perform geometric subdivision on the feature polygon to generate a state sub-region, and calculate a corresponding electrical performance quantization index set according to the state sub-region.

[0079] The fusion module is configured to fuse the electrical performance quantization index set to generate a dynamic compensation amount.

[0080] The correction module is configured to generate a preset given reference signal in a reference signal modulation channel of a PWM controller, input the dynamic compensation amount into the reference signal modulation channel, and correct amplitude and phase parameters of the preset given reference signal to obtain a composite reference modulation signal.

[0081] The generation module is configured to input the composite reference modulation signal and a high-frequency triangular carrier signal into two input ends of a comparator for comparison to generate a switching modulation pulse.

[0082] The control module is configured to perform potential translation and power amplification on the switching modulation pulse to generate a safe control instruction, control the turn-on and turn-off timing of a power switching device in a half-bridge power conversion circuit, and realize output response control of the high-voltage power supply of the electron beam welding machine.

[0083] It should be noted that the system corresponds to the above method, and all implementation manners in the above method embodiment are applicable to this embodiment and can achieve the same technical effects.

[0084] The embodiment of the present application also provides a computing device, comprising a processor, a memory storing a computer program, the computer program being executed by the processor to perform the method as described above. All implementation manners in the above method embodiment are suitable for this embodiment and can achieve the same technical effects.

[0085] The embodiment of the present application also provides a computer readable storage medium storing instructions, which, when executed on a computer, cause the computer to perform the method as described above. All implementation manners in the above method embodiment are suitable for this embodiment and can achieve the same technical effects.

[0086] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A high-frequency transformer isolation control method for a high-voltage power supply of an electron beam welding machine, characterized in that, The method includes: Step 1: In the high voltage generation and output main circuit on the secondary side of the high-frequency transformer, select three critical operating nodes, namely the high voltage output terminal of the secondary winding, the intermediate capacitor connection point in the voltage multiplier rectifier circuit, and the final DC high voltage output terminal. Collect the instantaneous values ​​of the output voltage and output current of the three critical operating nodes to obtain electrical parameter samples. Step 2: Based on electrical parameter samples, construct a dynamic operating state vector and generate feature polygons within a preset two-dimensional operating state plane with voltage and current as coordinate axes; Step 3: Perform geometric subdivision on the feature polygons to generate state sub-regions, and calculate the corresponding set of electrical performance quantification indicators based on the state sub-regions; Step 4: Based on the electrical performance quantification index set, extract the ripple coefficient and power loss parameters for each state sub-region to generate an original parameter set; normalize the ripple coefficient and power loss parameters according to the numerical range of each parameter in the original parameter set to obtain a normalized parameter set; determine the weight values ​​of the ripple coefficient and power loss according to the importance of the parameters in the normalized parameter set; calculate the weighted performance index based on the normalized ripple coefficient and normalized power loss in the normalized parameter set, combined with the corresponding ripple coefficient weight values ​​and power loss weight values; calculate the comprehensive performance index based on the weighted performance index; compare the comprehensive performance index with the preset performance target reference value to obtain the performance deviation; calculate the preliminary dynamic compensation amount based on the performance deviation; perform boundary constraint processing based on the preliminary dynamic compensation amount and the preset compensation amount boundary conditions to generate the dynamic compensation amount. Step 5: Generate a preset reference signal in the reference signal modulation channel of the PWM controller, input the dynamic compensation amount into the reference signal modulation channel, and correct the amplitude and phase parameters of the preset reference signal to obtain a composite reference modulation signal. Step 6: The composite reference modulation signal and the high-frequency triangular carrier signal are input together to the two input terminals of the comparator for comparison, generating a switching modulation pulse; Step 7: Shift and amplify the switching modulation pulse to generate a safety control command, and control the on and off timing of the power switching devices in the half-bridge power conversion circuit to achieve high-voltage power supply output response control for the electron beam welding machine.

2. The high-frequency transformer isolation control method for high-voltage power supplies of electron beam welding machines using the boundary expansion-based leap-of-thought method as described in claim 1, characterized in that, Based on electrical parameter samples, a dynamic operating state vector is constructed within a pre-defined two-dimensional operating state plane with voltage and current as coordinate axes, generating feature polygons, including: Based on the electrical parameter samples, the voltage and current sampling values ​​at each critical operating node are extracted, and the voltage and current data of each node are mapped to a preset two-dimensional operating state plane to generate three corresponding state coordinate points. Based on the spatial distribution of the three state coordinate points in the two-dimensional running state plane, calculate the coordinates of the geometric center point of the three state coordinate points; based on the relative positional relationship between the geometric center point coordinates and each state coordinate point, calculate the polar angle parameter of each state coordinate point relative to the geometric center point. Based on the polar angle parameter, the three state coordinate points are sorted clockwise to generate an ordered vertex sequence; based on the ordered vertex sequence, the vertices are connected sequentially to form a closed geometric structure, generating a feature polygon.

3. The high-frequency transformer isolation control method for the high-voltage power supply of an electron beam welding machine according to claim 2, characterized in that, The feature polygons are geometrically subdivided to generate state sub-regions, and the corresponding set of electrical performance quantification indicators is calculated based on the state sub-regions, including: Based on the ordered vertex sequence of the feature polygon, the coordinate values ​​of each vertex in the two-dimensional running state plane are obtained sequentially; based on the coordinate values, the product of the x-coordinate of each vertex and the y-coordinate of the next vertex is calculated sequentially according to the vertex order to obtain the first set of product sequences; based on the coordinate values, the product of the y-coordinate of each vertex and the x-coordinate of the next vertex is calculated sequentially according to the vertex order to obtain the second set of product sequences. Based on the sum of the product values ​​in the first product sequence and the sum of the product values ​​in the second product sequence, calculate the difference between the two sums, take the absolute value of the difference and divide it by two to obtain the total area parameter of the feature polygon. Based on the total area parameter of the feature polygon and the coordinate values ​​of each vertex, the weighted average of the coordinates of each vertex is calculated to obtain the centroid coordinates of the feature polygon; based on the centroid coordinates of the feature polygon, the centroid is connected to each vertex of the feature polygon to divide the feature polygon into multiple triangular sub-regions. Based on the coordinates of the three vertices of each triangular sub-region, calculate the area parameter of each triangular sub-region; based on the coordinates of the three vertices of each triangular sub-region, calculate the length of the line segments of the three sides, and add the lengths of the line segments of the three sides to obtain the perimeter parameter of each triangular sub-region. Based on the area and perimeter parameters of each triangular sub-region, the area-to-perimeter ratio of each triangular sub-region is calculated; based on the area-to-perimeter ratio of each triangular sub-region, combined with the preset electrical performance conversion coefficient, a set of quantitative electrical performance indicators is calculated.

4. The high-frequency transformer isolation control method for the high-voltage power supply of the electron beam welding machine according to claim 3, characterized in that, A preset reference signal is generated in the reference signal modulation channel of the PWM controller. The dynamic compensation amount is input into the reference signal modulation channel to correct the amplitude and phase parameters of the preset reference signal, resulting in a composite reference modulation signal, including: Based on the dynamic compensation amount, the dynamic compensation amount is separated into amplitude compensation component and phase compensation component; based on the amplitude parameters of the preset reference signal and the amplitude compensation component, the corrected reference signal amplitude parameters are calculated; Based on the preset phase parameters and phase compensation components of the reference signal, the phase parameters of the corrected reference signal are calculated; the amplitude parameters and phase parameters of the corrected reference signal are processed to generate a new reference signal waveform sequence. The waveform sequence of the new reference signal is fused with the original preset reference signal to obtain a preliminary composite reference modulation signal; the preliminary composite reference modulation signal is then processed to obtain the final composite reference modulation signal.

5. The high-frequency transformer isolation control method for the high-voltage power supply of the electron beam welding machine according to claim 4, characterized in that, The composite reference modulation signal and the high-frequency triangular carrier signal are input together to the two input terminals of the comparator for comparison, generating a switching modulation pulse, including: Based on the composite reference modulation signal and the preset high-frequency triangular carrier signal parameters, the instantaneous voltage value sequence of the composite reference modulation signal is obtained, and the corresponding high-frequency triangular carrier signal waveform is generated. Based on the instantaneous voltage value sequence of the composite reference modulation signal and the waveform of the high-frequency triangular carrier signal, a comparator is used to perform real-time voltage comparison calculation to obtain the corresponding high and low level state signals. Based on the high and low level state signals, detect all transition times of the comparator output state and generate a level transition time sequence; based on the level transition time sequence, calculate the duration parameter of the high level state within each signal cycle and generate a switch modulation pulse sequence; Based on the switching modulation pulse sequence, verify whether the pulse width parameter meets the preset pulse width safety constraint, and generate the switching modulation pulse.

6. The high-frequency transformer isolation control method for the high-voltage power supply of an electron beam welding machine according to claim 5, characterized in that, The switching modulation pulse is potential-shifted and power-amplified to generate safety control commands, and the on / off timing of the power switching devices in the half-bridge power conversion circuit is controlled to achieve high-voltage power supply output response control for the electron beam welding machine, including: Based on the switching modulation pulse, the pulse signal is converted from the control circuit potential reference point to the floating potential reference point required by the power switching device, generating a potential-shifted pulse signal; based on the potential-shifted pulse signal, the current driving capability of the pulse signal is enhanced through a multi-stage push-pull amplifier circuit to generate a power-enhanced pulse signal. Based on the power-enhanced pulse signal and combined with the preset safety interval time parameter, a half-bridge complementary control signal is generated; based on the half-bridge complementary control signal, the timing relationship between the upper and lower bridge arm control signals is detected by the timing verification circuit to generate a safety control command. Based on safety control commands, the alternating on and off operations of the upper and lower power switching devices in the half-bridge power conversion circuit are controlled to complete the output response control of the high-voltage power supply of the electron beam welding machine.

7. A high-frequency transformer isolation control system for a high-voltage power supply of an electron beam welding machine, wherein the system implements the method as described in any one of claims 1 to 6, characterized in that, include: The acquisition module is used to select three critical operating nodes in the high voltage generation and output main circuit on the secondary side of the high-frequency transformer. These nodes are the high voltage output terminal of the secondary winding, the intermediate capacitor connection point in the voltage multiplier rectifier circuit, and the final DC high voltage output terminal. The module also acquires the instantaneous values ​​of the output voltage and output current at the three critical operating nodes to obtain electrical parameter samples. The construction module is used to construct a dynamic operating state vector and generate feature polygons based on electrical parameter samples in a preset two-dimensional operating state plane with voltage and current as coordinate axes; The calculation module is used to geometrically subdivide the feature polygons, generate state sub-regions, and calculate the corresponding set of electrical performance quantification indicators based on the state sub-regions. The fusion module is used to fuse the set of electrical performance quantitative indicators to generate dynamic compensation quantities; The correction module is used to generate a preset reference signal in the reference signal modulation channel of the PWM controller, input the dynamic compensation amount into the reference signal modulation channel, and correct the amplitude and phase parameters of the preset reference signal to obtain a composite reference modulation signal. The generation module is used to compare the composite reference modulation signal and the high-frequency triangular carrier signal by inputting them together to the two input terminals of the comparator to generate a switching modulation pulse. The control module is used to shift the potential and amplify the power of the switching modulation pulse, generate safety control commands, and control the on and off timing of the power switching devices in the half-bridge power conversion circuit to realize the output response control of the high-voltage power supply of the electron beam welding machine.

8. A computing device, characterized in that, include: One or more processors; A storage device for storing one or more programs that, when executed by one or more processors, cause the one or more processors to implement the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a program that, when executed by a processor, implements the method as described in any one of claims 1 to 6.

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