A control method for low voltage chopper circuit of welding machine

Abstract

The invention provides a control method for a low-voltage chopper circuit of a welding machine, which relates to the technical field of chopper control. The method includes establishing an interface connection between a storage power supply and a target welding machine, identifying a circuit topology, calibrating a first circuit element and a second circuit element, and exploring a fuzzy control logic under the driving control of the circuit element, and supervising and training a microcontroller; receiving welding parameters and sampling circuit electrical data to generate a driving signal, assisting the microcontroller in performing directional signal amplification and modulation, and introducing resonance to perform soft switching control, so as to solve the technical problems existing in the prior art that the control logic is unclear, the signal amplification and modulation response are not accurate, and the welding control effect and stability are limited. The method assists the microcontroller in performing signal-driven amplification processing and resonance control based on a fuzzy control strategy for a specific circuit structure, thereby achieving more accurate and stable welding circuit control.

Description

Technical Field

[0001] The invention relates to the technical field of chopper control, and in particular to a control method for a low-voltage chopper circuit of a welding machine. Background Art

[0002] In welding equipment, low-voltage chopper circuits are an important component to ensure stable and precise control of the welding process. Traditional welding machine control methods usually use hard switch control. Although it can achieve a certain degree of power regulation, it often generates large electromagnetic interference and switching losses due to the frequent on and off of the switch tube, affecting the efficiency and reliability of control. With the development of welding technology, the requirements for welding machine control accuracy, stability and energy efficiency are increasing. Especially under low-voltage and high-frequency working conditions, how to better adjust welding parameters and effectively reduce power loss has become a difficult problem in technology research and development.

[0003] However, how to make the collaboration between circuit elements more efficient through reasonable signal amplification and modulation strategies under complex circuit topologies remains a technical challenge that needs to be solved urgently.

[0004] Therefore, the existing technology faces the problems of unclear control logic, inaccurate signal amplification and modulation response in the control of the low-voltage chopper circuit of the welding machine, resulting in limited welding control effect and stability. Summary of the invention

[0005] The present application provides a control method for a low-voltage chopper circuit of a welding machine, which is used to solve the technical problems existing in the prior art in the control of the low-voltage chopper circuit of a welding machine, such as unclear control logic, inaccurate signal amplification and modulation response, resulting in limited welding control effect and stability.

[0006] In view of the above problems, the present application provides a control method for a low-voltage chopper circuit of a welding machine, the method comprising:

[0007] Establishing an interface connection between the storage power source and the target welding machine, and obtaining the circuit topology of the target welding machine;

[0008] Identify the circuit topology, and calibrate a first circuit element and a second circuit element, wherein the first circuit element is an associated element for performing signal amplification control under push-pull driving, and the second circuit element is an associated element for performing soft switching control under push-pull driving;

[0009] Based on the circuit topology, mining the fuzzy control logic under the driving control of the first circuit element and the second circuit element, and supervising the training of the microcontroller;

[0010] The welding parameters are received and the circuit electrical data is sampled, a driving signal is generated based on the circuit topology, the microcontroller is assisted to perform signal directional amplification and modulation, and resonance is introduced to perform soft switching control.

[0011] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0012] A control method for a low-voltage chopper circuit of a welding machine provided in an embodiment of the present application establishes an interface connection between a storage power supply and a target welding machine, and obtains a circuit topology of the target welding machine; identifies the circuit topology, calibrates a first circuit element and a second circuit element, and based on the circuit topology, mines the fuzzy control logic under the drive control of the first circuit element and the second circuit element, and supervises and trains a microcontroller; receives welding parameters and samples circuit electrical data, generates a drive signal based on the circuit topology, assists the microcontroller in performing directional signal amplification and modulation, and introduces resonance to perform soft switching control, so as to solve the technical problems existing in the prior art in the control of a low-voltage chopper circuit of a welding machine, such as unclear control logic, inaccurate signal amplification and modulation response, and limited welding control effect and stability. By targeting a specific circuit structure, assisting the microcontroller, and performing signal-driven amplification processing and resonance control based on a fuzzy control strategy, more accurate and stable welding circuit control can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A flow chart of a control method for a low-voltage chopper circuit of a welding machine is provided for the present application.

[0014] Figure 2 The present application provides a schematic diagram of a flow chart of generating a drive signal based on a circuit topology in a control method of a low-voltage chopper circuit of a welding machine. DETAILED DESCRIPTION

[0015] The present application provides a control method for a low-voltage chopper circuit of a welding machine, establishes an interface connection between a storage power supply and a target welding machine, identifies a circuit topology, calibrates a first circuit element and a second circuit element, and explores the fuzzy control logic under the drive control of the circuit element, and supervises and trains a microcontroller; receives welding parameters and samples circuit electrical data, generates a drive signal, assists the microcontroller in performing directional signal amplification and modulation, and introduces resonance to perform soft switching control, so as to solve the technical problems existing in the prior art in the control of a low-voltage chopper circuit of a welding machine, such as unclear control logic, inaccurate signal amplification and modulation response, and limited welding control effect and stability.

[0016] Example: Figure 1 As shown, the present application provides a control method for a low-voltage chopper circuit of a welding machine, the method comprising:

[0017] S1: Establishing an interface connection between the storage power source and the target welding machine, and obtaining the circuit topology of the target welding machine;

[0018] In the embodiment of the present application, before executing the control of the low-voltage chopper circuit of the welding machine, it is necessary to first establish an interface connection between the storage power supply and the target welding machine, that is, to connect the target welding machine to the power supply, wherein the storage power supply is a mobile power supply, for example, a battery, to ensure that effective power and control signal transmission can be performed between the power supply and the welding machine circuit. Specifically, the storage power supply is physically connected to the circuit system of the welding machine through a standardized connection port, and the connection port can support the stable transmission of current and voltage, ensuring that the coordinated work of the power supply and the welding machine circuit does not interfere under different working conditions.

[0019] Furthermore, the circuit topology is a structural diagram of various circuit elements (such as resistors, capacitors, inductors, switch elements, etc.) inside the welding machine and their connection relationships, so as to fully understand the composition of the welding machine circuit and the relationship between the various elements. Preferably, the circuit topology can be converted into a data structure that can be analyzed and processed in a digital or graphical manner for use in the design and optimization of subsequent control logic.

[0020] By establishing an interface connection between the storage power supply and the target welding machine and obtaining the circuit topology, reliable data support and technical guarantee are provided to ensure that the low-voltage chopper circuit of the welding machine can operate stably and efficiently under different working conditions.

[0021] S2: Identify the circuit topology, and calibrate the first circuit element and the second circuit element, wherein the first circuit element is an associated element for signal amplification control under push-pull driving, and the second circuit element is an associated element for soft switching control under push-pull driving;

[0022] Specifically, the function and role of each circuit element in the circuit topology are identified in detail. The topology diagram usually contains a variety of circuit elements, such as inductors, resistors, capacitors, transistors, etc. By analyzing the characteristics of these elements and their interconnection relationships, the elements that play a key role in signal amplification and soft switching control are identified.

[0023] Wherein, the first circuit element refers to an associated element for signal amplification control under push-pull drive. Wherein, the function of the push-pull drive circuit is to amplify the input weak signal to ensure that the amplitude of the signal meets the requirements of current and voltage during welding. When calibrating the first circuit element, its working principle and adjustment method under push-pull drive must be clarified. For example, if the first circuit element is a push-pull power amplifier, then its calibration process may include adjusting parameters such as gain factor and operating frequency to ensure that the signal amplification achieves the expected effect.

[0024] Furthermore, in contrast to the first circuit element, the second circuit element refers to an associated element that performs soft switching control under push-pull drive. Through soft switching control, the technology of reducing switching losses by switching the switching element at zero voltage or zero current is used to improve the efficiency of power electronic equipment and reduce electromagnetic interference. The main task of the second circuit element is to implement soft switching operation in the circuit, and through precise control signals, the switching element is turned on or off at the appropriate time to avoid switching spikes or other undesirable effects at high voltage or high current.

[0025] In an embodiment of the present application, the soft switch control cooperates with the PWM pulse width modulation circuit to perform adaptive switch control to maximize the avoidance of errors and abnormal control events in the actual control process. When calibrating the second circuit element, it is necessary to confirm its role in the soft switch control, especially its collaborative working relationship with the first circuit element. For example, a resonant circuit formed by the second circuit element enables the switch element to switch under zero voltage or zero current conditions by adjusting the resonant frequency and phase. Even if there are errors and other conditions in the execution response process of the drive signal generated by the PWM pulse width modulation circuit, accurate control effects can still be achieved.

[0026] Through this identification and calibration process, the foundation can be laid for the subsequent control logic design, ensuring that the functions of the first circuit element and the second circuit element in the welding machine low-voltage chopper circuit can be fully utilized, and the coordinated work between the two can achieve the optimal control effect.

[0027] S3: Based on the circuit topology, mining the fuzzy control logic under the driving control of the first circuit element and the second circuit element, and supervising the training of the microcontroller;

[0028] Specifically, after completing the identification of the circuit topology and the calibration of the circuit elements, the fuzzy control logic under the drive control of the first circuit element and the second circuit element is further explored, and the microcontroller is supervised and trained to improve the control accuracy and stability by optimizing the control logic, thereby finely and effectively adjusting important parameters such as current and voltage in the welding process.

[0029] First, based on the overall architecture of the circuit topology, the fuzzy control logic under the driving control of the first circuit element and the second circuit element is explored. That is, the control method is realized through fuzzy rules and empirical data. In the low-voltage chopper circuit of the welding machine, the core task of the fuzzy control logic is to dynamically adjust the working state of the first circuit element and the second circuit element according to different welding parameters (such as welding current, voltage, etc.) to ensure the stability and efficiency of the welding process.

[0030] For the first circuit element (i.e., the amplification control element of the drive signal), its fuzzy control logic needs to dynamically adjust the working mode of the push-pull drive circuit according to the characteristics of the input signal (such as current fluctuations, load changes, etc.). For example, when the welding current changes greatly, the amplitude of signal amplification should be appropriately increased to meet the high load requirements; when the current is relatively stable, the amplitude of amplification should be reduced to improve efficiency and avoid unnecessary energy loss.

[0031] For the second circuit element (i.e., the soft switch control element under push-pull drive), the goal of its fuzzy control logic is to reduce switching losses and electromagnetic interference by optimizing switching operations. In soft switching control, fuzzy control can dynamically adjust the on and off timing of the switching element according to the fluctuations of voltage and current to achieve zero voltage on and zero current off, thereby minimizing switching losses. In specific practice, the soft switch control strategy is adjusted according to the circuit parameters monitored in real time to ensure that the circuit is always in the best working state under different load conditions.

[0032] The microcontroller is the core of the welding machine control. Its task is to process the feedback data from the circuit in real time and generate drive signal processing and response control according to the preset control logic. During the supervised training process, the microcontroller will continuously learn how to adjust the control strategy according to the real-time circuit status. The specific training steps include two stages: one is to optimize the control rules based on historical data to improve the control accuracy; the other is to verify the effectiveness of the control strategy through simulation or actual operation, and make adjustments and optimizations.

[0033] In summary, the low-voltage chopper circuit control of the welding machine can achieve precise control and efficient welding process management, providing a strong guarantee for the improvement of welding technology.

[0034] Among them, to explore the fuzzy control logic under the driving control of the first circuit element, step S3 of the present application also includes:

[0035] Based on the control and adjustment requirements of the welding machine, N directional amplification tasks are determined; the N directional amplification tasks are traversed, and in combination with the historical amplification records, N directional control strategies based on the first circuit element are mined; the N directional control strategies are clustered and the intra-cluster logic is linearized to determine M fuzzy control methods, wherein M is a positive integer less than or equal to N, and the approximate control method is used as the clustering condition; and the M fuzzy control methods are added into the first fuzzy control logic.

[0036] In a feasible embodiment, based on the control and adjustment requirements of the welding machine, N directional amplification tasks are first determined. The core of this step is to subdivide the required signal amplification tasks according to different welding application scenarios (such as different materials, different welding currents, voltage requirements, etc.). Each directional amplification task represents a specific adjustment requirement, such as current peak control and welding voltage smoothing control in a certain welding process. The determination of these tasks is based on the welding process, material properties and specific welding parameter requirements. For example, if the current amplitude needs to be quickly adjusted during the welding process to adapt to different loads, a directional amplification task is generated to ensure that the push-pull drive circuit can meet this requirement.

[0037] The historical amplification record refers to the control strategy and effect of how to deal with similar amplification requirements in the past welding process. Combined with the historical amplification record, N directional control strategies based on the first circuit element are excavated. That is, by analyzing the record, the strategy of how the push-pull drive circuit adjusts the signal amplification under different welding conditions can be extracted. For example, when the current increases to a certain level, the amplification gain needs to be gradually adjusted to avoid circuit overload or excessive current fluctuations during welding.

[0038] The N directional control strategies are clustered, that is, the strategies are divided into several clusters according to the similarity of the directional control strategies to simplify the control logic. The clustering condition is usually the similarity between the strategies, that is, when the strategies have a high consistency in terms of control objectives, control methods, etc., they can be classified into the same cluster. The intra-cluster logic linearization is to further convert the control strategies in each cluster into a linearized form, so that they can be more easily used in actual control. For example, there may be a group of control strategies that adjust the current amplification method. These strategies will be classified into one category. There are amplitude fluctuations under multiple levels of state in this category, and the linear relationship between the amplitude modulation and the adjustment of the specific state level is determined. Another type of control strategy may be specifically optimized for voltage changes. These strategies will be classified into another category.

[0039] After clustering and linearization, M fuzzy control methods are determined, where the M control methods are control logic extracted from the clustered control strategy, and the M fuzzy control methods are added to the first fuzzy control logic. In the specific execution process, the fuzzy control logic automatically selects and applies one or more fuzzy control methods through the fuzzy reasoning mechanism and combines the different conditions of the input signal, thereby realizing the dynamic adjustment of parameters such as welding current or voltage, and ensuring the stability and accuracy of the welding process.

[0040] Among them, to explore the fuzzy control logic under the driving control of the second circuit element, step S3 of the present application also includes:

[0041] A resonant circuit is constructed for the second circuit element; by introducing resonance, zero voltage conduction and zero current shutdown of the circuit switch tube are used as control conditions, and combined with the resonance control record, X-item resonant control strategies based on the second circuit element are mined; the X-item resonant control strategies are traversed to mine approximate linear relationships and determine a second fuzzy control logic, wherein the approximate linear relationship takes the element parameter as an independent variable and the introduced resonance amount as a dependent variable.

[0042] Specifically, for the second circuit element (i.e., the associated element for soft switching control under push-pull drive), the resonant circuit in the circuit topology is first determined, that is, the circuit circuit formed based on the resonance phenomenon of elements such as inductors and capacitors. In the embodiment of the present application, it refers to the circuit formed by the second circuit element, and its main feature is that it can achieve energy exchange and conversion by adjusting element parameters at a specific frequency. In the low-voltage chopper circuit of the welding machine, the switching loss is reduced and the energy efficiency of the control is improved by accurately controlling the switching elements in the circuit. Specifically, by setting the resonant frequency to match the switching frequency, the circuit can operate under the conditions of zero voltage conduction and zero current shutdown, thereby avoiding excessive energy loss and electromagnetic interference during switching operations.

[0043] Among them, zero voltage turn-on and zero current turn-off refer to ensuring that the voltage or current value of the switch tube is zero when the switch element is switched, thereby minimizing the switching loss and electromagnetic interference of the switch tube. The specific implementation method is to adjust the resonant frequency and phase of the resonant circuit so that the switch tube can be turned on or off when the current or voltage is zero. For example, when the current is zero and the switch tube is turned off, it no longer bears the current shock, avoiding the energy loss caused by the current mutation; similarly, zero voltage turn-on can prevent the switch tube from switching at high voltage, reducing the switching loss.

[0044] The resonance control record refers to the operation record of the second circuit element under the control of the resonant circuit for different loads and working conditions in previous welding processes. These records include the turn-on and turn-off timing of the switch tube in different working modes, as well as the adjustment method of the resonant circuit. By analyzing these historical control data, it is possible to dig out the resonance control strategy that adapts to different welding conditions. For example, the record may show that under low load conditions, the resonant frequency should be appropriately reduced to improve the control accuracy; while under high load conditions, the frequency needs to be increased to improve the response speed of the system.

[0045] Furthermore, the X-item resonant control strategies are traversed to explore approximate linear relationships. Each control strategy represents a specific resonant circuit adjustment method and the corresponding welding parameter adjustment result. By traversing these strategies, the linear laws therein are discovered, and then the approximate linear relationships are explored. The linear relationship refers to the relative adjustment relationship between component parameters (such as inductance, capacitance, etc.) and the introduced resonance amount (i.e., parameters such as resonance frequency and resonance amplitude) in the control strategy. At this time, the component parameters are used as independent variables, and the resonance amount introduced in the control process is used as the dependent variable. The relationship between the two can usually be expressed by a linear model. For example, when the inductance value increases, the resonance frequency may decrease, and when the capacitance value increases, the resonance frequency may increase.

[0046] Finally, the linear relationship is used as the second fuzzy control logic to dynamically adjust the control strategy according to the real-time circuit parameters (such as inductance, capacitance, frequency, etc.), thereby optimizing the current and voltage control during the welding process. The fuzzy control logic uses the fuzzy reasoning mechanism to select the most appropriate resonant control strategy based on the input fuzzy information, thereby achieving precise control of the second circuit element. In this way, the system can automatically adjust the resonant control parameters under different welding conditions to ensure that the effect of soft switching control is always maintained in the best state.

[0047] Wherein, the supervised training microcontroller, step S3 of the present application further includes:

[0048] Based on the first fuzzy control logic, supervise the training of the first micro control unit; based on the second fuzzy control logic, supervise the training of the second micro control unit; and integrate the first micro control unit and the second micro control unit in parallel to generate the microcontroller.

[0049] Furthermore, based on the first fuzzy control logic and the second fuzzy control logic, they are converted into executable control instructions, thereby achieving precise adjustment of the welding machine.

[0050] First, based on the first fuzzy control logic, supervised training is performed on the first microcontroller unit. The first microcontroller unit is mainly responsible for processing control tasks related to the first circuit element, that is, the control logic of amplifying the push-pull drive signal. Specifically, supervised training is performed based on the first fuzzy control logic and the historical amplification task until the adaptability of the control strategy meets the preset convergence condition, so that the control strategy can adjust the signal amplification amplitude of the push-pull drive circuit according to the real-time welding parameters (such as current, voltage, etc.).

[0051] Specifically, by converting the first fuzzy control logic into a format that can be understood and executed by the microcontroller unit, such as a digital signal or an adjustment algorithm, and further ensuring the accuracy of the decision output through sample training, the output of the push-pull drive circuit can be adjusted in real time during the working process to ensure the stability and accuracy of the welding process.

[0052] Similarly, based on the second fuzzy control logic and in combination with the resonance control record, the second micro control unit is supervised and trained. The second micro control unit is responsible for executing the soft switch control task associated with the second circuit element. The task of this unit is to accurately adjust the soft switch circuit according to the second fuzzy control logic to achieve the control conditions of zero voltage conduction and zero current shutdown.

[0053] The training methods of the first micro control unit and the second micro control unit are the same, but the specific training data are different.

[0054] Furthermore, the independently trained first microcontroller unit and the second microcontroller unit are integrated in parallel to generate the final microcontroller, that is, the signal amplification and soft switch control parts of the push-pull drive circuit are managed and adjusted at the same time, so as to realize the efficient cooperation of the two main control elements in the low-voltage chopper circuit of the welding machine.

[0055] S4: receiving welding parameters and sampling circuit electrical data, generating a driving signal based on the circuit topology, assisting the microcontroller to perform signal directional amplification and modulation, and introducing resonance to perform soft switching control.

[0056] In the welding machine low-voltage chopper circuit control method provided in the embodiment of the present application, welding parameters are received and circuit electrical data sampling is performed. Among them, the welding parameters include current, voltage, welding time, welding material type, etc., and the changes in welding conditions are understood in real time. Circuit electrical data sampling means that during the welding process, the system needs to regularly collect real-time electrical data in the circuit, such as voltage, current, power, etc., through sensors or other measuring devices to reflect the working status during the welding process, which can provide a basis for subsequent control decisions. For example, when the welding current is too high, the system can adjust the signal amplification strategy according to the collected data to avoid equipment overload.

[0057] After receiving the welding parameters and circuit electrical data, based on the circuit topology, the control generates a drive signal to assist the first microcontroller unit to perform directional signal amplification and modulation based on the push-pull control circuit, so that it can meet the welding requirements while ensuring the strength and quality of the signal. The directional adjustment is specifically manifested in adjusting the amplification ratio and the modulation mode. For example, when the current load is large, the microcontroller can compensate for the current fluctuation by increasing the amplitude of the signal to ensure the stability of the current during the welding process.

[0058] Furthermore, the second microcontroller unit is assisted to perform resonance control compensation for the push-pull circuit, that is, the first circuit switch tube and the second circuit switch tube, to achieve soft switching operation with zero voltage conduction and zero current shutdown. There is a one-to-one connection relationship between the circuit switch tube and the push-pull drive circuit. Soft switching control can significantly reduce switching losses and electromagnetic interference and improve the efficiency of the circuit. For example, when the current drops to near zero, the microcontroller can instruct the switch element to disconnect; similarly, when the voltage is close to zero, the switch element can be turned on. This precise control method can greatly improve the overall efficiency and stability of the circuit.

[0059] In summary, by receiving welding parameters and sampling circuit electrical data, the system can obtain electrical data in the welding process in real time and generate appropriate drive signals based on these data. The microcontroller plays a core role in this process. Through signal directional amplification modulation and the introduction of resonance control, the low-voltage chopper circuit of the welding machine can be precisely adjusted, thereby ensuring the efficiency, stability and accuracy of the welding process.

[0060] The circuit topology includes a push-pull circuit, a first push-pull driving circuit, a second push-pull driving circuit and a PWM pulse width modulation circuit, wherein the first push-pull driving circuit and the second push-pull driving circuit are arranged in parallel.

[0061] In the welding machine low voltage chopper circuit control method of the present invention, the circuit topology includes a push-pull circuit, a first push-pull driving circuit, a second push-pull driving circuit and a PWM pulse width modulation (PWM) circuit. The circuit topology is designed to achieve the stable output required in the welding process through precise current and voltage regulation.

[0062] Specifically, the main function of the push-pull circuit is to provide stable voltage and current output according to welding parameters and load conditions. In the application embodiment, the PWM pulse width modulation circuit can generate a suitable drive signal according to the welding parameters (such as current, voltage, welding time, etc.) collected in real time, and then adjust the working state of the push-pull circuit, so as to achieve precise control of the power output of the welding machine. The PWM pulse width modulation circuit works in coordination with the first push-pull drive circuit and the second push-pull drive circuit to ensure stability and efficiency during the welding process by dynamically adjusting the current and voltage.

[0063] The first push-pull drive circuit and the second push-pull drive circuit are complementary and alternately controlled. The parallel configuration enables each push-pull drive circuit to work independently or together in different working conditions, and back up each other to avoid failure of the entire system when a single circuit element fails or is overloaded. Through this redundant configuration, the system can dynamically adjust the working mode of the two circuits according to the different requirements of the welding working conditions.

[0064] The push-pull circuit includes a first circuit switch tube and a second circuit switch tube, and there is a one-to-one mapping connection relationship between the circuit switch tube and the push-pull driving circuit. The push-pull driving circuit amplifies the driving signal and acts on the connected circuit switch tube to perform control response.

[0065] Among them, Figure 2 As shown, based on the circuit topology, a driving signal is generated, and step S4 of the present application further includes:

[0066] Based on the PWM pulse width modulation circuit, a drive signal based on the welding parameters and the circuit electrical data is generated; the drive signal is subjected to signal complementary decoupling to determine a first drive signal and a second drive signal; based on a synchronization timestamp, circuit flow constraints are imposed on the first drive signal and the second drive signal.

[0067] Specifically, based on the PWM pulse width modulation circuit, a driving signal based on the welding parameters and the circuit electrical data is generated. The PWM pulse width modulation circuit uses pulse width modulation technology to generate a regulation signal, and the duty cycle of the signal (i.e., the ratio of pulse width to period) is dynamically adjusted according to real-time welding parameters (such as current, voltage, welding current waveform, etc.) and collected circuit electrical data. For example, when the current load increases, the PWM circuit may increase the duty cycle, thereby increasing the power output to meet the needs of the welding process.

[0068] Next, the drive signal is subjected to signal complementary decoupling to determine the first drive signal and the second drive signal. Signal complementary decoupling refers to decomposing the generated drive signal to obtain two complementary and coordinated signals - the first drive signal and the second drive signal. For example, the opening of the first circuit switch tube and the closing of the second circuit switch tube. The decoupling process of complementary signals is to ensure the stability and efficiency of the circuit and to avoid overload or interference of the two signals to the circuit at the same time. For example, the first drive signal controls the first switching element in the push-pull circuit, and the second drive signal controls the second switching element. By designing these two signals as complementary signals, it can be ensured that the two do not conflict with each other during operation, avoid simultaneous conduction of current, and ensure the safety and efficiency of the circuit.

[0069] Furthermore, based on the synchronization timestamp, the circuit flow constraints are applied to the first drive signal and the second drive signal. That is, the two drive signals are precisely synchronized in time to ensure that they perform circuit control under appropriate timing. The circuit flow constraint is a timing relationship applied to the first drive signal and the second drive signal on the basis of the synchronization timestamp to avoid unnecessary conflicts or transition problems between the two signals. Specifically, the timing of the first drive signal and the second drive signal needs to be precisely coordinated to ensure that the switching elements in the circuit can be turned on or off at the right time. For example, if the two signals are turned on for too long, it may cause the power switching element to overload or short-circuit, affecting the stability of the circuit; if the signal is not turned on in the right timing, it may affect the welding effect. Therefore, the flow constraints based on the synchronization timestamp can effectively avoid these problems and ensure the accuracy and reliability of the signal switching.

[0070] In summary, the drive signal generated by the PWM pulse width modulation circuit is dynamically adjusted according to the changes in welding parameters and circuit electrical data. Signal complementary decoupling achieves precise control of the circuit by decomposing the drive signal into the first and second signals. The synchronous timestamp and circuit flow constraints ensure that the signal is switched and adjusted at the appropriate time, avoiding possible conflicts and overloads, and ensuring the stable operation and high efficiency of the entire welding machine low-voltage chopper circuit.

[0071] Among them, the microcontroller is assisted to perform signal directional amplification modulation, and resonance is introduced to perform soft switch control. Step S4 of the present application also includes:

[0072] Based on the first micro control unit, directional signal amplification processing is performed on the first drive signal to determine a first amplified signal, and directional signal amplification processing is performed on the second drive signal to determine a second amplified signal, wherein the adjustment parameter of the first circuit element is used as the amplification method, and the amplification directions of the first drive signal and the second drive signal are mutually exclusive; the first amplified signal and the second amplified signal act on the push-pull circuit to perform soft switching control.

[0073] In an embodiment of the present application, based on the first microcontroller unit, the first drive signal is subjected to directional signal amplification processing through the built-in first fuzzy control logic to determine the first amplified signal. For example, in a push-pull circuit, the amplification method of the first drive signal may adopt a specific gain factor to ensure that the signal is strong enough and does not cause excessive amplification or distortion. Its amplification method will be closely related to the parameter adjustment of the first circuit element, that is, the first microcontroller unit achieves the goal of signal amplification by adjusting the parameters of the circuit element (such as gain, delay, etc.). In this way, the amplified first signal can accurately drive the switch element in the first push-pull circuit.

[0074] Similarly, based on the first microcontroller unit, the second drive signal is subjected to directional signal amplification processing to determine the second amplified signal. Similar to the processing method of the first drive signal, the amplification process of the second drive signal will optimize the signal strength and characteristics according to the adjustment parameters of the second circuit element. The amplification directions of the first drive signal and the second drive signal are mutually exclusive. Specifically, the amplification directions of the first and second signals are opposite to ensure that they do not act simultaneously in the push-pull circuit, thereby avoiding causing a short circuit or overload in the circuit. In this way, the second amplified signal is adjusted to complement the first amplified signal to ensure the safety and efficient operation of the circuit.

[0075] Furthermore, the first amplified signal and the second amplified signal act on the push-pull circuit to perform soft switching control. After signal amplification, the first amplified signal and the second amplified signal are respectively applied to the corresponding circuit switch tubes in the push-pull circuit. The first switch tube and the second switch tube in the push-pull circuit will be alternately turned on and off according to the adjustment of the two signals to achieve effective power conversion.

[0076] Among them, based on soft switching control, when the switch element is turned on or off, the voltage or current is ensured to be close to zero, so as to reduce switching loss and electromagnetic interference and improve circuit efficiency. Specifically, the first amplified signal drives the switch element of the first push-pull circuit to turn on, while the second amplified signal controls the switch element of the second push-pull circuit to turn off, and vice versa. Through this precise control, the system can reduce power loss and heating problems in the circuit while ensuring efficient energy conversion.

[0077] Wherein, the first amplified signal and the second amplified signal act on the push-pull circuit to perform soft switching control, and step S4 of the present application further includes:

[0078] In combination with the second microcontroller unit, the resonance control parameters of the second circuit element are determined in the circuit scenario; based on the resonance control parameters, the first circuit switch tube driven by the first amplified signal is controlled to be turned on, and the second circuit switch tube driven by the second amplified signal is controlled to be turned off, wherein the first circuit switch tube and the second circuit switch tube respond alternately by being turned on and off.

[0079] Specifically, in combination with the second micro-control unit, the resonance control parameters of the second circuit element in the circuit scenario are determined. The second micro-control unit is used to determine the resonance control parameters of the second circuit element (such as the second switch element or other related circuit elements) according to the current circuit working scenario (such as load conditions, voltage and current fluctuations, welding requirements, etc.).

[0080] Among them, the resonance control aims to optimize the operating frequency of the circuit to make the switching of current and voltage waveforms smoother, reduce energy loss during the switching process, and reduce electromagnetic interference. In this process, the second micro-control unit monitors the circuit in real time, and combines the second fuzzy control logic to match and derive the resonance control parameters, such as oscillation frequency, damping coefficient, etc., to ensure that the circuit can operate smoothly under specific welding parameters.

[0081] Next, assisting the resonance control parameters, the first circuit switch tube driven by the first amplified signal is turned on / off controlled, and the second circuit switch tube driven by the second amplified signal is turned off / on controlled. Once the resonance control parameters are determined, the second microcontroller unit applies these parameters to the operation of the circuit to accurately regulate the working state of the switch tube. Specifically, when the first switch tube is turned on, the current flows through the first circuit path to provide the required power, and the second switch tube is turned off to ensure that the second path does not generate unnecessary power consumption or energy loss.

[0082] In summary, the second microcontroller unit accurately controls the on and off of the switch element driven by the first amplified signal and the second amplified signal by determining and applying the resonance control parameters. This fine control not only ensures the efficient operation of the low-voltage chopper circuit of the welding machine, but also optimizes the current transmission path through the timing arrangement of the alternating response, reduces energy loss, and improves the stability and efficiency of the system.

[0083] The present application provides a control method for a low-voltage chopper circuit of a welding machine, which has the following technical effects:

[0084] 1. By identifying the topological structure of the welding machine circuit, accurately calibrate the first circuit element (the associated element for signal amplification control under push-pull drive) and the second circuit element (the associated element for soft switch control under push-pull drive), and explore and construct the fuzzy control logic of the first circuit element and the second circuit element. By training the microcontroller, the control process is optimized through fuzzy control to ensure the stability and efficiency of the circuit under different welding conditions.

[0085] 2. Perform signal complementary decoupling on the drive signal to generate a first drive signal and a second drive signal, and perform circuit flow constraints based on the synchronization timestamp to ensure the timing consistency of the signal and avoid circuit overload.

[0086] 3. The first microcontroller unit and the second microcontroller unit respectively perform directional signal amplification processing and soft switch control on the first drive signal and the second drive signal, optimize the signal strength and adjustment method, and improve the adaptive ability and control accuracy of the circuit control. At the same time, by accurately controlling the on-off alternating response of the switch element, the energy conversion process of the circuit is optimized, the power loss is reduced, and the working efficiency of the circuit is improved.

[0087] In summary, the dynamic control and modulation in the low-voltage chopper circuit of the welding machine can be accurately regulated to achieve efficient and stable welding process control.

[0088] Through the above-mentioned detailed description of the control method of a low-voltage chopper circuit of a welding machine in this specification, those skilled in the art can clearly know the control method of a low-voltage chopper circuit of a welding machine in this embodiment. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0089] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a low-voltage chopper circuit of a welding machine, characterized in that: The method comprises: Establishing an interface connection between the storage power source and the target welding machine, and obtaining the circuit topology of the target welding machine; Identify the circuit topology, and calibrate a first circuit element and a second circuit element, wherein the first circuit element is an associated element for performing signal amplification control under push-pull driving, and the second circuit element is an associated element for performing soft switching control under push-pull driving; Based on the circuit topology, mining the fuzzy control logic under the driving control of the first circuit element and the second circuit element, and supervising the training of the microcontroller; Receiving welding parameters and sampling circuit electrical data, generating a drive signal based on the circuit topology, assisting the microcontroller in signal directional amplification and modulation, and introducing resonance to perform soft switching control; Wherein, mining the fuzzy control logic under the driving control of the first circuit element includes: Based on the control and adjustment requirements of the welding machine, determine N directional amplification tasks; Traversing the N directional amplification tasks, combining historical amplification records, and mining N directional control strategies based on the first circuit element; Perform clustering processing and intra-cluster logic linearization on the N directional control strategies to determine M fuzzy control modes, where M is a positive integer less than or equal to N, and the approximate control mode is used as the clustering condition; Adding the M fuzzy control modes into the first fuzzy control logic; Wherein, mining the fuzzy control logic under the driving control of the second circuit element includes: For the second circuit element, construct a resonant circuit; By introducing resonance, taking the zero voltage turn-on and zero current turn-off of the circuit switch tube as control conditions, combined with the resonance control record, the X-item resonance control strategy based on the second circuit element is explored; The X-term resonance control strategy is traversed to explore an approximate linear relationship and determine a second fuzzy control logic, wherein the approximate linear relationship takes the component parameter as an independent variable and takes the introduced resonance amount as a dependent variable.

2. A control method for a welding machine low voltage chopper circuit as claimed in claim 1, characterized in that: The supervised training microcontroller comprises: Based on the first fuzzy control logic, supervise and train the first micro control unit; Based on the second fuzzy control logic, supervise and train the second micro control unit; The first micro control unit and the second micro control unit are integrated in parallel to generate the microcontroller.

3. A control method for a welding machine low voltage chopper circuit as claimed in claim 2, characterized in that: The circuit topology includes a push-pull circuit, a first push-pull driving circuit, a second push-pull driving circuit and a PWM pulse width modulation circuit, wherein the first push-pull driving circuit and the second push-pull driving circuit are arranged in parallel.

4. The method according to claim 3, characterized in that Generating a driving signal based on the circuit topology includes: Based on the PWM pulse width modulation circuit, a driving signal based on the welding parameter and the circuit electrical data is generated; Performing signal complementary decoupling on the driving signal to determine a first driving signal and a second driving signal; Based on the synchronization timestamp, circuit flow constraints are performed on the first driving signal and the second driving signal.

5. A control method for a welding machine low voltage chopper circuit as claimed in claim 4, characterized in that: Assisting the microcontroller to perform signal directional amplification modulation and introduce resonance to perform soft switching control, including: Based on the first micro control unit, the first drive signal is subjected to directional signal amplification processing to determine a first amplified signal, and the second drive signal is subjected to directional signal amplification processing to determine a second amplified signal, wherein the adjustment parameter of the first circuit element is used as the amplification mode, and the amplification directions of the first drive signal and the second drive signal are mutually exclusive; The first amplified signal and the second amplified signal act on the push-pull circuit to perform soft switching control.

6. A control method for a welding machine low voltage chopper circuit as claimed in claim 5, characterized in that: The first amplified signal and the second amplified signal act on the push-pull circuit to perform soft switching control, including: In combination with the second micro control unit, determining a resonance control parameter of the second circuit element in a circuit scenario; Based on the resonance control parameter, the first circuit switch tube driven by the first amplified signal is controlled to be turned on, and the second circuit switch tube driven by the second amplified signal is controlled to be turned off, wherein the first circuit switch tube and the second circuit switch tube respond alternately by turning on and off.

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