Control circuit and control method for medium-speed wire cutting pulse power supply

Abstract

The invention discloses a control circuit and a control method for a medium-speed wire cutting pulse power supply, and belongs to the technical field of electric spark cutting, the control circuit comprises a gap detection circuit, a commutation high-frequency breaking circuit, an FPGA decoding circuit and a CPLD pulse power supply controller, the gap detection circuit and the commutation high-frequency breaking circuit are respectively connected to the CPLD pulse power supply controller, and the CPLD pulse power supply controller is connected to the FPGA decoding circuit. The opening parameter is decoded by the FPGA decoding circuit and then is input into the CPLD pulse power supply controller; the gap detection circuit is used for detecting a discharge gap between a molybdenum wire and a workpiece, if the gap detects no load, the discharge energy is increased, if the gap detects short circuit, the inter-pulse amplitude is increased, and if the gap is stable, a set opening parameter is kept; the reversing high-frequency breaking circuit is used for detecting the rotating speed of the wire barrel motor, and when the rotating speed of the motor is detected to be lower than a set value, pulse power supply output is cut off during wire barrel reversing. According to the scheme, the cutting stability and quality can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric spark wire cutting, and in particular to a control circuit and a control method for a medium wire cutting pulse power supply. Background Art

[0002] Medium-speed wire cutting is a high-precision technology that uses the principle of electrospark machining to process metal materials. The pulse power supply of the medium-speed wire cutting machine, also known as high-frequency power supply, is one of the key factors affecting the process indicators of wire cutting.

[0003] Most of the existing medium-speed wire cutting pulse power supplies set processing parameters through the wire cutting control panel. When the gap between the wire and the workpiece changes due to poor cutting, or the material density of the workpiece itself changes, the constant processing energy cannot automatically identify the gap state and make adjustments, resulting in an unstable discharge gap that cannot be restored by itself, forming a short circuit state in the electrical processing, causing the control system to shut down. At this time, only manual intervention can be used to adjust the relationship between the molybdenum wire and the workpiece, resulting in low comprehensive cutting efficiency, and sometimes even wire breakage, which greatly wastes workpiece time.

[0004] And when the motor drives the wire barrel to rotate forward-stop-reverse-stop-forward alternately, there will inevitably be a process of acceleration and deceleration of the molybdenum wire from static to dynamic. The speed of the molybdenum wire is reduced from 5m / s to 0, and then reversely accelerated to 5m / s. During this process, if the pulse power supply continues to output the opening waveform and energy, the molybdenum wire will not be able to quickly etch out the impurities of the workpiece at low speed, and it will not be able to quickly cool down, which will cause burns / overcuts on the workpiece surface and other severe processing consequences, and it is easy to cause the molybdenum wire to break due to excessive current. The existing technical solutions usually cut off the pulse at the control end, there is a time difference, and the energy output cannot be quickly and timely cut off, which will cause wire marks on the workpiece surface, also known as commutation marks, affecting the cutting finish. Summary of the invention

[0005] In view of the technical problems existing in the prior art, the present invention provides a control circuit and a control method for a medium-speed wire cutting pulse power supply, which can adaptively control the switching parameters of the pulse power supply through hardware, thereby improving the cutting stability and smoothness.

[0006] According to a first aspect of the present invention, a control circuit of a medium-speed wire cutting pulse power supply is provided, comprising a gap detection circuit, a commutation cut-off high-frequency circuit, an FPGA decoding circuit, and a CPLD pulse power supply controller, wherein the gap detection circuit and the commutation cut-off high-frequency circuit are respectively connected to the CPLD pulse power supply controller, and the activation parameters are decoded by the FPGA decoding circuit and input into the CPLD pulse power supply controller; the gap detection circuit is used to detect the discharge gap between the molybdenum wire and the workpiece, and the discharge energy is increased if the gap is detected to be unloaded, and the pulse amplitude is increased if the gap is detected to be short-circuited, and the set activation parameters are maintained if the gap is stable; the commutation cut-off high-frequency circuit is used to detect the rotation speed of the wire barrel motor, and when it is detected that the motor rotation speed is lower than the set value, the pulse power output is cut off when the wire barrel is commutated.

[0007] By adopting the above technical solutions, the gap detection circuit monitors the discharge gap between the molybdenum wire and the workpiece in real time, and can intelligently adjust the discharge energy and pulse amplitude, ensuring that the best cutting effect can always be maintained under different cutting conditions. The commutation high-frequency circuit monitors the speed of the wire barrel motor. When the speed is lower than the set value, it cuts off the pulse power output, which can effectively prevent overcutting and burns caused by low speed, and extend the service life of the equipment and molybdenum wire. Through intelligent feedback and dynamic adjustment, the processing quality and efficiency of medium-wire cutting are significantly improved, while the reliability and safety of the equipment are enhanced.

[0008] Optionally, in the control circuit of the medium-speed wire-cutting pulse power supply provided by the present invention, the FPGA decoding circuit is used to decode the activation parameters and input them into the CPLD pulse power supply controller, and the activation parameters include pulse width, pulse frequency, activation voltage, closing voltage, pulse interval, and current amplitude.

[0009] The above technical solution provides accurate and real-time control signals for the CPLD pulse power supply controller by efficiently decoding and processing the activation parameters.

[0010] Optionally, in the control circuit of the medium-speed wire cutting pulse power supply provided by the present invention, the control circuit also includes a power amplifier driving circuit connected to the output end of the CPLD pulse power supply controller, the negative output end of the power amplifier driving circuit is connected to the molybdenum wire, the positive output end is connected to the workpiece, and the discharge gap between the molybdenum wire and the workpiece is connected to the gap detection circuit; the gap detection circuit is used to detect the discharge gap voltage between the molybdenum wire and the workpiece in real time, and the detected discharge gap voltage is stepped down by the step-down circuit and compared with a preset adjustable standard voltage, and the output comparison result signal is fed back to the CPLD pulse power supply controller.

[0011] By adopting the above technical solution, the discharge energy can be adaptively adjusted by comparing the detected gap voltage with the preset adjustable standard voltage. This adjustment helps to optimize the cutting effect and ensure that the best performance can be maintained under different processing conditions.

[0012] Optionally, in the control circuit of the medium-speed wire-cutting pulse power supply provided by the present invention, the gap detection circuit is used to output three state signals according to the voltage comparison result, namely, the gap voltage is higher than the standard voltage, the gap voltage is lower than the standard voltage, and the gap voltage is equal to the standard voltage, and the output state signal is fed back to the CPLD pulse power supply controller after optical coupling isolation.

[0013] By adopting the above technical solution, the gap detection signal is electrically isolated from the main control circuit through optical coupling isolation, which effectively prevents the influence of high voltage on the CPLD controller and improves the safety and stability of the system.

[0014] Optionally, in the control circuit of the medium-speed wire cutting pulse power supply provided by the present invention, the CPLD pulse power supply controller is used to execute a first activation logic according to the feedback result of the gap detection circuit. The first activation logic is that if the gap detects no load, the high voltage is switched on; if the gap detects a short circuit, the pulse amplitude is increased; when the gap is stable, the main voltage is kept on.

[0015] By adopting the above technical solution, the CPLD pulse power supply controller can flexibly respond to different discharge states by executing the first opening logic, thereby improving the efficiency and quality of medium-speed wire cutting, while reducing the risk of failure, enhancing the intelligence level of the system, and providing reliable guarantee for efficient processing.

[0016] Optionally, in the control circuit of the medium-speed wire cutting pulse power supply provided by the present invention, the commutation high-frequency circuit is used to receive the speed signal on the frequency converter that controls the wire barrel motor, and feed back the speed signal to the CPLD pulse power supply controller via optocoupler isolation.

[0017] By adopting the above technical solution, as the cutting load changes, real-time monitoring of the speed can ensure that the system adapts quickly to the load changes and prevent cutting quality problems caused by load fluctuations.

[0018] Optionally, in the control circuit of the medium-speed wire cutting pulse power supply provided by the present invention, the CPLD pulse power supply controller is used to execute a second activation logic according to the feedback result of the commutation high-frequency circuit. The second activation logic is to maintain the pulse output when the commutation speed of the wire barrel is higher than a preset value, and to turn off the pulse output when the commutation speed of the wire barrel is lower than the preset value.

[0019] By adopting the above technical solution, the CPLD pulse power supply controller can dynamically adjust the pulse output according to the feedback information of the wire barrel commutation speed by executing the second activation logic, thereby improving the efficiency and quality of wire cutting, while reducing energy consumption and failure risks, and enhancing the intelligence and safety of the system.

[0020] According to a second aspect of the present invention, a control method for a medium-speed wire cutting pulse power supply is provided, comprising: detecting the discharge gap voltage between the molybdenum wire and the workpiece through a gap detection circuit, and comparing the gap voltage with a standard voltage; if the gap voltage is lower than the standard voltage, increasing the discharge energy, if the gap is higher than the standard voltage, increasing the pulse amplitude, and if the gap voltage is equal to the standard voltage, maintaining the set parameters; detecting the rotation speed of the wire barrel motor through a commutation high-frequency circuit, and when it is detected that the motor rotation speed is lower than the set value, cutting off the pulse power output when the wire barrel is commutated, otherwise keeping the pulse power output on.

[0021] According to a third aspect of the present invention, a computing device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes a control method for a pulse power supply for medium-speed wire cutting as in the first aspect.

[0022] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium, comprising a computer program that can be loaded by a processor and execute the control method of the pulse power supply for medium-speed wire cutting as in the first aspect.

[0023] Compared with the prior art solutions, the control circuit and control method of the medium-speed wire cutting pulse power supply provided by the present invention can at least achieve the following beneficial effects: 1. The gap detection circuit monitors the discharge gap between the molybdenum wire and the workpiece in real time, and can intelligently adjust the discharge energy and pulse amplitude to ensure that the best cutting effect can always be maintained under different cutting conditions; 2. The speed of the wire barrel motor is monitored by the commutation high-frequency circuit. When the speed is lower than the set value, the pulse power output is cut off, which can effectively prevent problems such as overcutting and burning caused by low speed, and extend the service life of the equipment and molybdenum wire; 3. Through intelligent feedback and dynamic adjustment, the processing quality and efficiency of medium-speed wire cutting are significantly improved, while energy consumption and failure risks are reduced, and the intelligence and safety of the equipment are enhanced.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 It shows a schematic diagram of the structure of a control circuit of a pulse power supply for wire cutting according to an embodiment of the present invention; Figure 2 A schematic diagram of a gap detection circuit according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of a high-frequency commutation circuit according to an embodiment of the present invention is shown; Figure 4 A schematic flow chart of a method 400 for controlling a pulse power supply for wire cutting according to an embodiment of the present invention is shown; Figure 5 FIG. 1 is a schematic diagram showing the structure of a computing device 100 according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to solve the problems of poor cutting stability, poor finish, molybdenum wire breakage, etc., this scheme introduces an adaptive gap detection circuit and a molybdenum wire commutation high-frequency circuit in the pulse power supply control circuit. Through hardware detection and adaptive control, the recognition and response time of the control end is reduced, and the cutting quality and the stability and efficiency of the cutting process are improved.

[0027] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0028] Figure 1 The structure diagram of the control circuit of the pulse power supply for wire cutting according to one embodiment of the present invention is shown. Figure 1 As shown, the control circuit includes a gap detection circuit, a commutation high-frequency circuit, an FPGA decoding circuit, and a CPLD pulse power controller. The gap detection circuit, the commutation high-frequency circuit, and the FPGA decoding circuit are respectively connected to the CPLD pulse power controller.

[0029] Among them, the gap detection circuit is used to detect the discharge gap between the molybdenum wire and the workpiece. If the gap is detected to be unloaded, the discharge energy is increased. If the gap is detected to be short-circuited, the pulse amplitude is increased. If the gap is stable, the set opening parameters are maintained. The commutation cut-off high-frequency circuit is used to detect the speed of the wire barrel motor. When it is detected that the motor speed is lower than the set value, the pulse power output is cut off when the wire barrel is commutated.

[0030] The opening parameters are decoded by the FPGA decoding circuit and input into the CPLD pulse power controller. The opening parameters include pulse width, pulse frequency, opening voltage, closing voltage, pulse interval, and current amplitude. The input of opening parameters enables users to adjust according to specific cutting requirements. The opening parameters input by FPGA decoding can ensure that each parameter is accurately analyzed, ensuring accurate control of the power supply during the cutting process, thereby optimizing the cutting effect.

[0031] Under normal and stable operating conditions, the pulse power supply outputs a pulse signal according to the input switching parameters, and once a change in the gap state or a change in the speed of the molybdenum wire motor is detected, the switching parameters are adjusted.

[0032] Reference Figure 1 As shown, the control circuit also includes a power amplifier driving circuit connected to the output end of the CPLD pulse power controller, the negative output end of the power amplifier driving circuit is connected to the molybdenum wire, and the positive output end is connected to the workpiece, allowing the system to form a high-voltage discharge path between the two, thereby achieving cutting. The discharge gap between the molybdenum wire and the workpiece is connected to the gap detection circuit to monitor the discharge voltage in real time.

[0033] The gap detection circuit is used to detect the discharge gap voltage between the molybdenum wire and the workpiece in real time. The detected discharge gap voltage is stepped down by the step-down circuit and compared with the preset adjustable standard voltage. The output comparison result signal is fed back to the CPLD pulse power supply controller.

[0034] Figure 2 FIG. 2 shows a schematic diagram of a gap detection circuit according to an embodiment of the present invention. Figure 2 As shown, the discharge gap voltage between the molybdenum wire and the workpiece is connected to the input end of the gap detection circuit, and the high voltage is reduced by the step-down circuit to safely measure the gap voltage. The real-time detected gap voltage is compared with the standard voltage by the comparison circuit, and the output result signal is used to indicate the current gap state. The result signal is optically isolated to ensure the safe isolation of the high voltage part and the CPLD power supply control circuit.

[0035] According to one embodiment of the present invention. The gap detection circuit is used to output three state signals according to the voltage comparison result, namely, the gap voltage is higher than the standard voltage, the gap voltage is lower than the standard voltage, and the gap voltage is equal to the standard voltage, and the output state signal is fed back to the CPLD pulse power controller after optical coupling isolation. The CPLD pulse power controller executes the first opening logic according to the feedback result of the gap detection circuit, and dynamically adjusts the pulse output. The first opening logic is that if the gap detects no load, the high voltage is switched on; if the gap detects a short circuit, the pulse amplitude is increased; when the gap is stable, the main voltage is kept on. On the other hand, the commutation high-frequency circuit is used to receive the speed signal on the inverter that controls the wire barrel motor, and feeds back the speed signal to the CPLD pulse power controller through optical coupling isolation.

[0036] Figure 3 FIG. 2 shows a schematic diagram of a high-frequency switching circuit according to an embodiment of the present invention. Figure 3 As shown, the speed signal from the frequency converter controlling the wire barrel motor is connected to the commutation input terminal, and the detected speed signal is optically isolated to ensure the safe isolation of the high voltage part and the CPLD power supply control circuit. The CPLD pulse power supply controller is used to execute the second opening logic according to the feedback result of the commutation high-frequency circuit, realize dynamic adjustment based on the speed signal, and ensure the coordination of the pulse output and the wire barrel state during the cutting process. The second opening logic is: when the commutation speed of the wire barrel is higher than the preset value, the pulse output is maintained, and when the commutation speed of the wire barrel is lower than the preset value, the pulse output is turned off.

[0037] By achieving adaption at the hardware level, the recognition and response time of the control end is significantly reduced, making the system respond more quickly during the cutting process.

[0038] Figure 4 FIG. 4 is a flow chart showing a control method 400 of a pulse power supply for wire cutting according to an embodiment of the present invention. Figure 4 As shown, the discharge gap voltage between the molybdenum wire and the workpiece is detected by a gap detection circuit, and the gap voltage is compared with a standard voltage.

[0039] If the gap voltage is lower than the standard voltage, it means no load, increase the discharge energy to ensure cutting efficiency. If the gap voltage is higher than the standard voltage, it means short circuit, increase the pulse amplitude to prevent overcurrent from damaging the system. If the gap voltage is equal to the standard voltage, keep the set parameters to maintain a stable cutting state.

[0040] The speed of the wire barrel motor is detected by the commutation cut-off high-frequency circuit. When the motor speed is detected to be lower than the set value, the pulse power output is cut off when the wire barrel is commutated to protect the equipment and avoid unstable cutting caused by low-speed commutation. Otherwise, the pulse power output is kept on.

[0041] Through intelligent gap detection and commutation control, real-time monitoring and dynamic adjustment of the cutting process are achieved. Specifically: gap detection can automatically adjust the discharge energy according to different discharge states (no load, short circuit, normal) to improve the cutting effect. The commutation high-frequency circuit ensures that the power supply is cut off in time when the motor speed is unstable, avoiding equipment damage and maintaining cutting quality. This control method enhances the system's adaptive ability and improves the safety and efficiency of the cutting process.

[0042] Figure 5 FIG. 1 is a schematic diagram showing the structure of a computing device 100 according to an embodiment of the present invention. Figure 5As shown, in a basic configuration 102, computing device 100 typically includes system memory 106 and one or more processors 104. A memory bus 108 may be used for communication between processor 104 and system memory 106.

[0043] Depending on the desired configuration, the processor 104 can be any type of processor, including but not limited to: a microprocessor (µP), a microcontroller (µC), a digital signal processor (DSP), or any combination thereof. The processor 104 can include one or more levels of cache, such as a primary cache 110 and a secondary cache 112, a processor core 114, and registers 116. An example processor core 114 can include an arithmetic logic unit (ALU), a floating point unit (FPU), a digital signal processing core (DSP core), or any combination thereof. An example memory controller 118 can be used with the processor 104, or in some implementations, the memory controller 118 can be an internal part of the processor 104.

[0044] Depending on the desired configuration, the system memory 106 can be any type of memory, including but not limited to: volatile memory (such as RAM), non-volatile memory (such as ROM, flash memory, etc.) or any combination thereof. The physical memory in the computing device generally refers to the volatile memory RAM, and the data in the disk needs to be loaded into the physical memory before it can be read by the processor 104. The system memory 106 may include an operating system 120, one or more applications 122, and program data 124. In some embodiments, the application 122 may be arranged to execute instructions on the operating system by one or more processors 104 using the program data 124. The operating system 120 may be, for example, Linux, Windows, etc., which includes program instructions for processing basic system services and performing hardware-dependent tasks. The application 122 includes program instructions for implementing various user-desired functions, and the application 122 may be, for example, a browser, instant messaging software, a software development tool (such as an integrated development environment IDE, a compiler, etc.), etc., but is not limited thereto. When the application 122 is installed in the computing device 100, a driver module may be added to the operating system 120.

[0045] When the computing device 100 starts running, the processor 104 reads and executes the program instructions of the operating system 120 from the memory 106. The application 122 runs on the operating system 120 and uses the interfaces provided by the operating system 120 and the underlying hardware to implement various functions desired by the user. When the user starts the application 122, the application 122 is loaded into the memory 106, and the processor 104 reads and executes the program instructions of the application 122 from the memory 106.

[0046] Computing device 100 also includes a storage device 132 including a removable storage 136 and a non-removable storage 138 , both of which are connected to storage interface bus 134 .

[0047] The computing device 100 may also include an interface bus 140 that facilitates communication from various interface devices (e.g., output devices 142, peripheral interfaces 144, and communication devices 146) to the basic configuration 102 via the bus / interface controller 130. Example output devices 142 include a graphics processing unit 148 and an audio processing unit 150. They can be configured to facilitate communication with various external devices such as a display or speakers via one or more A / V ports 152. Example peripheral interfaces 144 may include a serial interface controller 154 and a parallel interface controller 156, which may be configured to facilitate communication with external devices such as input devices (e.g., keyboards, mice, pens, voice input devices, touch input devices) or other peripherals (e.g., printers, scanners, etc.) via one or more I / O ports 158. Example communication devices 146 may include a network controller 160, which may be arranged to facilitate communication with one or more other computing devices 162 via a network communication link via one or more communication ports 164.

[0048] A network communication link can be an example of a communication medium. The communication medium can generally be embodied as a computer-readable instruction, data structure, program module in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium. A "modulated data signal" can be a signal in which one or more of its data sets or its changes can be performed in a manner that encodes information in the signal. As a non-limiting example, the communication medium may include a wired medium such as a wired network or a dedicated line network, and various wireless media such as sound, radio frequency (RF), microwave, infrared (IR) or other wireless media. The term computer-readable medium used here may include both storage media and communication media. In the computing device 100 according to the present invention, the application 122 includes instructions for executing the control method 400 of the medium-speed wire cutting pulse power supply of the present invention.

[0049] In summary, the control circuit and control method of the medium-speed wire cutting pulse power supply provided by the present invention can at least achieve the following beneficial effects: 1. The gap detection circuit monitors the discharge gap between the molybdenum wire and the workpiece in real time, and can intelligently adjust the discharge energy and pulse amplitude to ensure that the best cutting effect can always be maintained under different cutting conditions; 2. The speed of the wire barrel motor is monitored by the commutation high-frequency circuit. When the speed is lower than the set value, the pulse power output is cut off, which can effectively prevent problems such as overcutting and burning caused by low speed, and extend the service life of the equipment and molybdenum wire; 3. Through intelligent feedback and dynamic adjustment, the processing quality and efficiency of medium-speed wire cutting are significantly improved, while energy consumption and failure risks are reduced, and the intelligence and safety of the equipment are enhanced.

[0050] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0051] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the following intention: that the claimed invention requires more features than the features explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0052] Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in the devices described in the embodiment, or alternatively may be located in one or more devices different from the devices in the examples. The modules in the foregoing examples may be combined into one module or may be divided into multiple submodules.

[0053] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and further may be divided into a plurality of submodules or subunits or subcomponents. All features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device so disclosed may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0054] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0055] In addition, some of the embodiments are described herein as a combination of methods or method elements that can be implemented by a processor of a computer system or by other devices that perform functions. Therefore, a processor with necessary instructions for implementing a method or method element forms a device for implementing the method or method element. In addition, the elements described herein of the device embodiment are examples of devices that are used to implement the functions performed by the elements for the purpose of implementing the invention.

[0056] As used herein, unless otherwise specified, the use of ordinal numbers "first," "second," "third," etc. to describe common objects merely indicates that different instances of similar objects are involved, and is not intended to imply that the objects so described must have a given order in time, space, order, or in any other manner.

[0057] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is illustrative and not restrictive with respect to the scope of the present invention, and the scope of the present invention is defined by the appended claims.

Claims

1. A control circuit for a medium-speed wire cutting pulse power supply, characterized in that: It includes a gap detection circuit, a commutation disconnection high-frequency circuit, an FPGA decoding circuit, and a CPLD pulse power controller. The gap detection circuit and the commutation disconnection high-frequency circuit are respectively connected to the CPLD pulse power controller, and the opening parameters are decoded by the FPGA decoding circuit and then input into the CPLD pulse power controller; The gap detection circuit is used to detect the discharge gap between the molybdenum wire and the workpiece. If the gap is detected to be unloaded, the discharge energy is increased; if the gap is detected to be short-circuited, the pulse amplitude is increased; if the gap is stable, the set opening parameters are maintained; The commutation cut-off high-frequency circuit is used to detect the rotation speed of the wire barrel motor. When it is detected that the motor rotation speed is lower than the set value, the pulse power supply output is cut off when the wire barrel is commutated.

2. The control circuit of the medium-speed wire cutting pulse power supply according to claim 1 is characterized in that: The FPGA decoding circuit is used to decode the opening parameters and input them into the CPLD pulse power supply controller. The opening parameters include pulse width, pulse frequency, opening voltage, closing voltage, pulse interval, and current amplitude.

3. The control circuit of the medium-speed wire cutting pulse power supply according to claim 1 is characterized in that: The control circuit also includes a power amplifier driving circuit connected to the output end of the CPLD pulse power controller, the negative output end of the power amplifier driving circuit is connected to the molybdenum wire, the positive output end is connected to the workpiece, and the discharge gap between the molybdenum wire and the workpiece is connected to the gap detection circuit; the gap detection circuit is used to detect the discharge gap voltage between the molybdenum wire and the workpiece in real time, and the detected discharge gap voltage is reduced by a step-down circuit and compared with a preset adjustable standard voltage, and the comparison result signal is output and fed back to the CPLD pulse power controller.

4. The control circuit of the medium-speed wire cutting pulse power supply according to claim 3 is characterized in that: The gap detection circuit is used to output three status signals according to the voltage comparison result: the gap voltage is higher than the standard voltage, the gap voltage is lower than the standard voltage, and the gap voltage is equal to the standard voltage, and the output status signal is fed back to the CPLD pulse power supply controller after optical coupling isolation.

5. The control circuit of the medium-speed wire cutting pulse power supply according to claim 1 is characterized in that: The CPLD pulse power supply controller is used to execute the first opening logic according to the feedback result of the gap detection circuit. The first opening logic is to switch the high voltage on if the gap detects no load, increase the pulse amplitude if the gap detects a short circuit, and keep the main voltage on when the gap is stable.

6. The control circuit of the medium-speed wire cutting pulse power supply according to claim 1 is characterized in that: The commutation high-frequency circuit is used to receive the speed signal on the frequency converter that controls the wire barrel motor, and feed back the speed signal to the CPLD pulse power controller through optical coupling isolation.

7. The control circuit of the medium-speed wire cutting pulse power supply according to claim 6 is characterized in that: The CPLD pulse power controller is used to execute the second opening logic according to the feedback result of the commutation high-frequency circuit. The second opening logic is to maintain the pulse output when the commutation speed of the wire barrel is higher than the preset value, and to turn off the pulse output when the commutation speed of the wire barrel is lower than the preset value.

8. A control method for a pulse power supply for medium-speed wire cutting, characterized in that: The control circuit of the medium-speed wire cutting pulse power supply according to any one of claims 1 to 7 is implemented, comprising: The discharge gap voltage between the molybdenum wire and the workpiece is detected by the gap detection circuit, and the gap voltage is compared with the standard voltage; If the gap voltage is lower than the standard voltage, the discharge energy is increased; if the gap voltage is higher than the standard voltage, the pulse amplitude is increased; if the gap voltage is equal to the standard voltage, the set parameters are maintained; The rotation speed of the wire barrel motor is detected by the commutation cut-off high-frequency circuit. When it is detected that the motor speed is lower than the set value, the pulse power output is cut off when the wire barrel is commutated, otherwise the pulse power output is kept on.

9. A computing device, characterized in that It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method of the medium-speed wire cutting pulse power supply as described in claim 8.

10. A computer-readable storage medium, characterized in that: It includes a computer program that can be loaded by a processor and execute the control method of the pulse power supply for medium-speed wire cutting as claimed in claim 8.

Images