Pulse power supply circuit, pulse power supply control method, controller and medium

Abstract

The embodiment of the invention provides a pulse power supply circuit, a pulse power supply control method, a controller and a medium, and relates to the technical field of power supplies. The circuit comprises a numerical control unit, a power tube array unit and an energy storage array unit, the power tube array unit comprises at least two first power tubes, and any two first power tubes are connected in parallel; the numerical control unit is electrically connected with each first power tube, and each first power tube is electrically connected with the energy storage array unit; wherein the energy storage array unit is used for outputting pulse current when the first power tube is closed; and the numerical control unit is used for controlling the duty ratio of each first power tube so as to control the pulse width of the pulse current output by the energy storage array unit. According to the embodiment of the invention, heat generated by the pulse power supply can be reduced.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a pulse power supply circuit, a pulse power supply control method, a controller and a medium. Background Art

[0002] A pulse power supply is a power supply device that can provide high-energy pulses (for example, pulses with large current or large power) in a short period of time. Pulse power supplies are widely used in fields such as material processing and biomedicine. At present, when pulse power supplies output high-energy pulses, they are often accompanied by significant thermal effects, that is, they release a large amount of heat. For example, in the field of material processing, when pulse power supplies output high-energy pulses, they will generate excessive heat, which will reduce the energy utilization efficiency of the pulse power supply and shorten the service life of the pulse power supply.

[0003] Therefore, how to reduce the heat generated by the pulse power supply has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to propose a pulse power supply circuit, a pulse power supply control method, a controller and a medium, aiming to reduce the heat generated by the pulse power supply to improve the energy utilization efficiency of the pulse power supply.

[0005] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present application provides a pulse power supply circuit, the circuit comprising: a digital control unit, a power tube array unit, and an energy storage array unit;

[0006] The power tube array unit comprises at least two first power tubes, and any two of the first power tubes are connected in parallel with each other;

[0007] The digital control unit is electrically connected to each of the first power tubes, and each of the first power tubes is electrically connected to the energy storage array unit;

[0008] Among them, the energy storage array unit is used to output a pulse current when the first power tube is closed; the digital control unit is used to control the duty cycle of each of the first power tubes to control the pulse width of the pulse current output by the energy storage array unit.

[0009] In some embodiments, the maximum value of the pulse current is 1500 amperes, and the number of the first power tubes is 500.

[0010] In some embodiments, the energy storage array unit includes at least two supercapacitors;

[0011] The number of the supercapacitors is 100, and the maximum output current of each supercapacitor is 15 amperes.

[0012] In some embodiments, the circuit further comprises:

[0013] A power conversion unit, the power conversion unit is electrically connected to the energy storage array unit, and the power conversion unit is used to convert an input AC voltage into a DC voltage.

[0014] In some embodiments, the circuit further comprises:

[0015] A fixture unit, wherein the fixture unit is electrically connected to the energy storage array unit and the power tube array unit, the fixture unit is used to clampably connect a metal workpiece, and the energy storage array unit outputs a pulse current to process the metal workpiece.

[0016] To achieve the above-mentioned purpose, a second aspect of an embodiment of the present application provides a pulse power supply control method, which is applied to a digital control unit of the pulse power supply circuit described in the first aspect above;

[0017] The method comprises:

[0018] Collecting the pulse current output by the energy storage array unit to obtain the pulse current value;

[0019] If the pulse current value is greater than a preset pulse current threshold, the duty cycle of each first power tube in the power tube array unit is reduced according to the pulse current threshold to reduce the pulse width of the pulse current.

[0020] In some embodiments, reducing the duty cycle of each first power tube in the power tube array unit according to the pulse current threshold to reduce the pulse width of the pulse current includes:

[0021] According to the pulse current threshold, a preset current pulse width relationship table is searched to obtain a target pulse width corresponding to the pulse current threshold;

[0022] generating a duty cycle control signal according to the target pulse width;

[0023] The duty cycle of each of the first power tubes is controlled by the duty cycle control signal so that the pulse width of the pulse current is updated to the target pulse width.

[0024] In some embodiments, after obtaining the pulse current value, the method further includes:

[0025] If the pulse current value is less than a preset pulse current threshold, obtaining a target pulse width corresponding to the pulse current threshold;

[0026] The duty cycle of each first power tube in the power tube array unit is increased according to the target pulse width, so that the pulse width of the pulse current is updated to the target pulse width.

[0027] To achieve the above-mentioned purpose, the third aspect of an embodiment of the present application proposes a controller, which includes a memory and a processor, the memory stores a computer program, and the processor implements the pulse power supply control method described in the second aspect when executing the computer program.

[0028] To achieve the above objectives, the fourth aspect of an embodiment of the present application proposes a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the pulse power supply control method described in the second aspect.

[0029] The pulse power supply circuit, pulse power supply control method, controller and medium proposed in the present application take into account the problem of high heat generated by the pulse power supply, and adopt first power tubes connected in parallel to form a power tube array unit, disperse the current in a parallel manner, reduce the load of a single first power tube, and thus reduce the heat generated by the first power tube. The duty cycle of each first power tube is controlled by a numerical control unit to control the pulse width of the pulse current output by the energy storage array unit, thereby controlling the current duration, so as to control the heat generated by the current within a period of time (such as a pulse cycle). In summary, the present application can reduce the heat generated by the pulse power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a module block diagram of the pulse power supply circuit provided in the embodiment of the present application;

[0031] Figure 2 is a circuit schematic diagram of a pulse power supply circuit provided in an embodiment of the present application;

[0032] Figure 3 is a module block diagram of a pulse power supply circuit provided in another embodiment of the present application;

[0033] Figure 4 is a flow chart of a pulse power supply control method provided in an embodiment of the present application;

[0034] Figure 5 yes Figure 4 Flowchart of step 102 in FIG.

[0035] Figure 6 is a flow chart of a pulse power supply control method provided by another embodiment of the present application;

[0036] Figure 7 is a current-pulse-temperature relationship diagram of the pulse power supply provided in an embodiment of the present application;

[0037] Figure 8 is a schematic diagram of workpiece temperature provided in an embodiment of the present application;

[0038] Fig. 9It is a schematic diagram of the hardware structure of the controller provided in the embodiment of the present application.

[0039] Figure numerals: 10, numerical control unit; 20, power tube array unit; 21, first power tube; 30, energy storage array unit; 40, power conversion unit. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0043] First, some nouns involved in this application are analyzed:

[0044] Workpiece: refers to the object to be processed during machining. It can be a single part or a combination of several parts fixed together.

[0045] PWM (Pulse Width Modulation): is a technique for modulating signals by changing the pulse width, mainly used to convert analog signals into digital signals. PWM technology controls the power of a signal by changing the width of the pulse (i.e. the duration of a high level or a low level).

[0046] Duty cycle: refers to the ratio of the high level duration to the entire cycle time within a cycle.

[0047] DSP (Digital Signal Processor): A microprocessor specially designed to quickly implement digital signal processing algorithms. DSP is widely used in many fields such as audio processing, video processing, communications, radar, and automobiles. The design of DSP makes it particularly suitable for real-time signal processing tasks and can efficiently perform operations such as digital filtering, Fourier transform, and spectrum analysis.

[0048] CPU (Central Processing Unit): It is the core component of computer hardware, responsible for executing instructions in the program and processing data. The CPU processes the input data and outputs the processing results. It can process various types of data, such as integers, floating point numbers, characters, etc.

[0049] MCU (Microcontroller Unit): Also known as a microcontroller, it is an integrated circuit chip that integrates the CPU, memory, programmable input and output peripherals, etc. on a single chip. Microcontrollers are designed to perform specific control functions and are widely used in embedded systems and automation control fields.

[0050] PLC (Programmable Logic Controller): is a digitally operated electronic system. PLC is widely used in manufacturing, process control, automated production lines and other fields.

[0051] The pulse power supply circuit, pulse power supply control method, controller and medium provided in the embodiments of the present application are specifically illustrated through the following embodiments. First, the pulse power supply circuit in the embodiments of the present application is described.

[0052] Figure 1 This is an optional module block diagram of the pulse power supply circuit provided in the embodiment of the present application. The pulse power supply circuit includes: a digital control unit 10, a power tube array unit 20, and an energy storage array unit 30;

[0053] The power tube array unit 20 includes at least two first power tubes 21, and any two first power tubes 21 are connected in parallel with each other;

[0054] The digital control unit 10 is electrically connected to each first power tube 21 , and each first power tube 21 is electrically connected to the energy storage array unit 30 ;

[0055] The energy storage array unit 30 is used to output pulse current when the first power tube 21 is closed; the digital control unit 10 is used to control the duty cycle of each first power tube 21 to control the pulse width of the pulse current output by the energy storage array unit 30 .

[0056] The beneficial effects of the embodiments of the present application include but are not limited to: considering the problem of high heat generated by the pulse power supply, the power tube array unit 20 is composed of first power tubes 21 connected in parallel with each other, and the current is dispersed in parallel to reduce the load of a single first power tube 21, thereby reducing the heat generated by each first power tube 21. The duty cycle of each first power tube 21 is controlled by the numerical control unit 10 to control the pulse width of the pulse current output by the energy storage array unit 30, thereby controlling the current duration, so as to control the heat generated by the current within a period of time (such as a pulse cycle). In summary, the present application can reduce the heat generated by the pulse power supply.

[0057] It should be noted that the pulse power circuit is used in a pulse power device (referred to as pulse power). In the field of material processing, the pulse power supply outputs high-energy pulse current to the workpiece (i.e. the material being processed) to process the material. Figure 1 As shown, the first power tube 21 in the power tube array unit 20 and the energy storage array unit 30 are respectively connected to the workpiece. The workpiece may include metal materials, semiconductor materials, etc. Other types of materials may also be processed, which is not limited here. In addition, the pulse power supply outputs high-energy pulse current to perform specific operations of material processing, including but not limited to electroplating, electric spark wire cutting, micro-arc oxidation, etc.

[0058] In some embodiments, it should be noted that the current high-energy pulse power supply will produce obvious thermal effects in the high energy state, that is, when the current is large. For example, the current high-energy pulse power supply will generate a large amount of heat when the current is greater than or equal to 1000A (ampere). This will cause the processed material to deform due to thermal damage, reduce the energy utilization efficiency of the pulse power supply, and shorten the service life of the pulse power supply equipment.

[0059] In order to solve the above-mentioned problems, the embodiments of the present application reduce the heat generated by the pulse power supply by reducing the pulse width of the pulse current. For example, the duty cycle of each first power tube in the power tube array unit 20 is reduced to reduce the pulse width of the pulse current, that is, to reduce the duration of the pulse current, thereby reducing the heat generated by the pulse power supply. For example, the embodiments of the present application can ensure that the heat generated by the pulse power supply circuit is low when the current value of the pulse current is greater than or equal to 1000A, that is, there is no obvious thermal effect, which is not achievable by other current pulse power supplies. The pulse power supply circuit of the embodiments of the present application will not produce obvious thermal effects when the workpiece is subjected to high-energy electric pulse processing, effectively overcoming the above-mentioned problems caused by thermal effects, such as avoiding heat damage to the workpiece, improving the energy utilization efficiency of the pulse power supply circuit and the service life of the equipment, etc.

[0060] It should be noted that the current and pulse width of the pulse power supply circuit can be set according to needs. For example, assuming that the pulse power supply circuit adopts a current of less than 100A, when the current is small, the heat generated by the pulse power supply is small. The duty cycle of each first power tube 21 can be increased through the numerical control unit 10 to increase the pulse width of the pulse current and improve the power of the pulse power supply circuit.

[0061] In some embodiments, the pulse power circuit can be applied to the field of material processing, and can also be applied to the fields of biomedicine, industrial automation, etc., which are not limited in the embodiments of the present application. For example, in the field of biomedicine, the pulse power circuit can be applied to medical imaging equipment, such as magnetic resonance imaging (MRI) equipment and computed tomography (CT) equipment, to generate high-quality image information.

[0062] It is understandable that the first power tube 21 is a power tube. A power tube (Power Transistor) is an electronic component used to control relatively high power. By connecting multiple first power tubes 21 in parallel to form a power tube array unit 20, a higher output power can be achieved to meet application scenarios with high energy requirements. In addition, by sharing the load with multiple first power tubes 21 in parallel, the heat load of each first power tube 21 can be effectively reduced, the thermal management capability of the pulse power supply circuit can be improved, the thermal effect of the pulse power supply circuit can be controlled, and the heat generated by the pulse power supply circuit can be effectively reduced.

[0063] In some embodiments, the first power tube 21 may be a MOS tube (MOSFET, metal oxide semiconductor field effect transistor), which can realize fast switch control. The first power tube 21 may also be a bipolar transistor (BJT, Bipolar Junction Transistor), or other types of power tubes, which are not limited in the embodiments of the present application.

[0064] It is understandable that by using a large number of first power tubes 21 connected in parallel, the current can be distributed among the multiple first power tubes 21, thereby reducing the load of a single first power tube 21, reducing the operating temperature of a single first power tube 21, that is, reducing the heat generated by a single first power tube 21. In addition, the parallel structure can also make the unit heat exchange between the first power tubes 21 faster.

[0065] It can be understood that the numerical control unit 10 is used to control the duty cycle of each first power tube 21. Specifically, when the current is large, it can control each first power tube 21 to turn on and off quickly, that is, reduce the duty cycle of each first power tube 21, so that the current duration is shortened to reduce the heat generated by the current per unit time.

[0066] In some embodiments, the numerical control unit 10 may be a digital signal processor (DSP). In another embodiment, the numerical control unit 10 may include any one of a CPU (Central Processing Unit), an MCU (Microcontroller Unit), and a PLC (Programmable Logic Controller), and may also include other types of control chips, which are not limited here.

[0067] It can be understood that through the numerical control unit 10 and the power tube array unit 20, high-precision and shorter pulse width regulation can be achieved to meet specific application requirements, such as electrical processing of metal materials (i.e., metal workpieces) while avoiding damage to the metal materials due to the thermal effects of the pulse power supply circuit.

[0068] In some embodiments, the frequency of the pulse current of the pulse power supply circuit can be set by the numerical control unit 10. The user can adjust the frequency of the pulse power supply circuit according to demand, which is not limited here. It can be understood that, for example, the frequency of pulse power supply A is 100Hz, and the frequency of pulse power supply B is 1000Hz. Since the frequency of pulse power supply A is lower, the number of pulses output per unit time is smaller, and the heat accumulation rate is slower, the pulse power supply A generates less heat as a whole. Since the frequency of pulse power supply B is higher, the number of pulses output per unit time is larger, and the heat accumulation rate is faster, the pulse power supply B generates more heat as a whole. In order to reduce the heat, the frequency can be reduced as needed, such as setting the current frequency to 0 to 50Hz (Hertz).

[0069] In some embodiments, the voltage of the pulse power circuit can be set by the numerical control unit 10. For example, the voltage range includes 0 to 20V (volts). The user can adjust the voltage of the pulse power circuit according to the needs, which is not limited here.

[0070] In some embodiments, in the power tube array unit 20 , the number of the first power tubes 21 ranges from 100 to 500.

[0071] In some embodiments, the maximum value of the pulse current is 1500 amperes, and the number of the first power tubes 21 is 500.

[0072] The advantage of this embodiment is that, for a large pulse current, such as a current value of 1500 amperes, a large number of first power tubes 21 connected in parallel are provided, for example, 500 first power tubes 21 connected in parallel are provided. Since the larger the pulse current, the greater the heat generated, a large number of power tubes (i.e., first power tubes 21) connected in parallel are used for current shunting, so that the pulse current flowing through each first power tube 21 is smaller while ensuring that the pulse current can output a high current, thereby reducing the load of a single first power tube 21 and reducing the heat generated by each first power tube 21.

[0073] In some embodiments, for example, the maximum value of the pulse current is 1500 amperes, and the resistance of each first power tube 21 is the same or similar. At this time, the current flowing through each first power tube 21 can be considered to be the same, and the current of each first power tube 21 is 3A (amperes).

[0074] See also Figure 2 , in some embodiments, the energy storage array unit 30 includes at least two supercapacitors;

[0075] The number of supercapacitors is 100, and the maximum output current of each supercapacitor is 15 amperes.

[0076] The advantage of this embodiment is that it uses a supercapacitor with fast charge and discharge capability and high power density, which is suitable for environments that require high current output. In addition, by connecting a large number (for example, 100) of supercapacitors in parallel, it is ensured that the pulse power supply can quickly provide the required high power when outputting short pulses. In summary, the embodiment of the present application can quickly charge and discharge and release high energy in a short time to achieve high power output.

[0077] It should be noted that in Figure 2 In the energy storage array unit 30, the energy storage array unit 30 may also include a resistor, which is connected in parallel with any supercapacitor. The supercapacitor may be a polar supercapacitor, and the positive electrode of the polar supercapacitor is used to connect the workpiece. In the energy storage array unit 30, the ellipsis between the two supercapacitors is used to indicate that the specific number of supercapacitors is not limited and can be adjusted according to demand. Similarly, in the power tube array unit 20, the ellipsis between the two first power tubes 21 is used to indicate that the specific number of the first power tubes 21 is not limited and can be adjusted according to demand.

[0078] It should be noted that when capacitors (such as supercapacitors) are connected in parallel, their total current is the sum of the currents of the individual capacitors. For example, assuming that the pulse current output by the pulse power supply circuit as a whole is 1500 amperes, 100 supercapacitors in parallel can be set, and the output current of each supercapacitor is 15 amperes.

[0079] In some embodiments, the digital control unit 10 is further used to control each first power tube 21 to be turned on (i.e. closed) at the same time, so that each super capacitor is discharged at the same time. Alternatively, the digital control unit 10 controls each first power tube 21 to be turned off at the same time, so that each super capacitor is charged at the same time. In summary, by controlling each super capacitor to charge and discharge at the same time, a pulse current is output.

[0080] See also Figure 2 In some embodiments, when the first power tube 21 is a MOS tube, the numerical control chip has a first port (S port) and a second port (G port). The S port is electrically connected to the source of each MOS tube, and the G port is electrically connected to the gate of each MOS tube. The numerical control chip is also used to control the change of the gate voltage through the G port, that is, to control the conduction and cutoff of the MOS tube, thereby controlling the pulse width of the pulse current. The drain of each MOS tube is used to electrically connect the workpiece, so as to output the pulse current to the workpiece for processing it.

[0081] In some embodiments, in the energy storage array unit 30 , the number of supercapacitors ranges from 50 to 300.

[0082] In some embodiments, the first power transistor 21 is an insulated gate bipolar transistor;

[0083] The insulated gate bipolar transistor has a resistance of less than or equal to 3 milliohms when closed.

[0084] The advantage of this embodiment is that, while ensuring that the pulse current output by the pulse power supply circuit is large (for example, 1500 amperes), by adopting an insulated gate bipolar transistor with a lower on-state voltage drop (that is, the resistance value in the closed state), the heat generated by the pulse power supply circuit can be further reduced, thereby improving the energy utilization efficiency of the pulse power supply circuit.

[0085] It should be noted that the Insulated Gate Bipolar Transistor (IGBT) is a power transistor with the characteristics of low on-state voltage drop and fast switching speed. The low on-state voltage drop of the IGBT means that the voltage drop in the on state (that is, the resistance value in the closed state) is small, thereby reducing heat generation and energy loss.

[0086] See also Figure 2 and Figure 3 , in some embodiments, the pulse power supply circuit further includes:

[0087] The power conversion unit 40 is electrically connected to the energy storage array unit 30 , and is used for converting the input AC voltage into a DC voltage.

[0088] The advantage of this embodiment is that the input AC voltage is converted into the required DC voltage through the power conversion unit 40, so that the power tube array unit 20 can accurately adjust the waveform of the DC power, such as adjusting the pulse width, thereby effectively controlling the voltage and current output by the pulse power supply circuit, and then controlling the thermal effect of the pulse power supply circuit and reducing heat generation.

[0089] It should be noted that in Figure 2 In the embodiment, the power conversion unit 40 has an AC IN port and a DC OUT port. The AC IN port represents an AC input port, and the DC OUT port represents a DC output port. In one embodiment, the DC OUT port includes a positive output terminal and a negative output terminal. If the supercapacitor is a polar supercapacitor, the positive output terminal of the DC OUT port is electrically connected to the positive electrode of the polar supercapacitor, and the negative output terminal of the DC OUT port is electrically connected to the negative electrode of the polar supercapacitor.

[0090] In some embodiments, the power conversion unit 40 includes an AC-DC converter. In another embodiment, the power conversion unit 40 includes a rectifier, and may also include other types of power conversion devices, which are not limited here.

[0091] It is understandable that the power conversion unit 40 is used to connect to an external power source. For example, the power conversion unit 40 can be connected to a 220V AC power source. The main function of the power conversion unit 40 is to convert alternating current (AC) into direct current (DC). For example, the power conversion unit 40 performs rectification, filtering, and voltage stabilization, thereby converting 220V AC into DC of a specific voltage, and then the DC is used to power the numerical control unit 10 and / or the energy storage array unit 30.

[0092] In some embodiments, the pulse power circuit further comprises:

[0093] A clamp unit (not shown in the figure) is electrically connected to the energy storage array unit 30 and the power tube array unit 20. The clamp unit is used to clampably connect the metal workpiece. The energy storage array unit 30 outputs a pulse current to process the metal workpiece.

[0094] The advantage of this embodiment is that the metal workpiece can be clamped by the clamp unit and a pulse current can be output to the metal workpiece, thereby achieving processing on the metal workpiece.

[0095] It is understandable that the metal workpiece can be processed by using pulse current to quickly heat, melt or even evaporate the metal workpiece locally, thereby achieving precision processing of the metal workpiece. Electroplating and other processing methods can also be used, but are not limited to these.

[0096] In some embodiments, the metal workpiece includes at least one of nickel, tungsten, aluminum, copper, titanium and other metals or their alloys. For example, the metal workpiece may be a nickel alloy, specifically a third-generation nickel-based single crystal high-temperature alloy. It is understandable that the pulse power supply circuit may also process workpieces of other material types, such as semiconductor materials, and the present application embodiment does not limit the material of the workpiece.

[0097] In some embodiments, the size of the metal workpiece is 15*10*1 mm (millimeter). Workpieces of different sizes can also be selected according to needs, but are not limited thereto.

[0098] Specifically, the pulse current applied by the pulse power supply to the workpiece, that is, the pulse current output by the pulse power supply circuit, has a value ranging from 300 to 1500A.

[0099] In some embodiments, the pulse power supply circuit further includes: an overcurrent protection unit (not shown in the figure);

[0100] The overcurrent protection unit is electrically connected to the energy storage array unit 30;

[0101] The overcurrent protection unit is used to perform overcurrent protection on the pulse current output by the energy storage array unit 30 .

[0102] The advantage of this embodiment is that an overcurrent protection unit is used to perform overcurrent protection on the pulse current output by the energy storage array unit 30, thereby avoiding damage to electronic components (such as the first power tube 21) caused by excessive pulse current, thereby improving the safety and stability of the pulse power supply circuit.

[0103] Specifically, the overcurrent protection unit may be electrically connected between the energy storage array unit 30 and the fixture unit.

[0104] In some embodiments, the pulse power supply circuit further includes: a signal filtering module (not shown in the figure);

[0105] The signal filtering module is electrically connected between the numerical control unit 10 and each first power tube 21;

[0106] The numerical control unit 10 is used to output a duty cycle control signal, the signal filtering module is used to filter the duty cycle control signal, and the first power tube 21 is used to switch the on / off state in response to the filtered duty cycle control signal.

[0107] The advantage of this embodiment is that the duty cycle control signal is filtered through the signal filtering module, thereby reducing noise interference in the duty cycle control signal and improving the control accuracy of the duty cycle of the first power tube 21, thereby more accurately controlling the pulse width of the pulse current and reducing the heat generated by the pulse power supply.

[0108] Figure 4It is an optional flow chart of the pulse power supply control method provided in an embodiment of the present application.

[0109] The pulse power supply control method is applied to the numerical control unit of the above-mentioned pulse power supply circuit; the pulse power supply control method may include but is not limited to steps 101 to 102.

[0110] Step 101, collecting the pulse current output by the energy storage array unit to obtain the pulse current value;

[0111] Step 102: if the pulse current value is greater than a preset pulse current threshold, the duty cycle of each first power tube in the power tube array unit is reduced according to the pulse current threshold to reduce the pulse width of the pulse current.

[0112] The beneficial effects of the embodiments of the present application include but are not limited to: considering the problem of high heat generated by the pulse power supply, the pulse current output by the energy storage array unit is sampled to obtain the pulse current value. If the pulse current value is greater than the preset pulse current threshold, the duty cycle of each first power tube in the power tube array unit is reduced according to the pulse current threshold to reduce the pulse width of the pulse current. The embodiments of the present application can reduce the heat generated by the pulse power supply, thereby avoiding heat damage to the workpiece, improving the energy utilization efficiency of the pulse power supply, and improving the service life of the equipment.

[0113] In step 101 of some embodiments, the pulse current output by the energy storage array unit can be sampled by an oscilloscope to obtain the pulse current value. The pulse current value can also be obtained by other means, for example, by current sampling by a current sensor, a multimeter, etc., which is not limited here.

[0114] In step 102 of some embodiments, the pulse current threshold is a preset current value. The pulse current threshold can be set to a larger current value, such as 1000A, 1500A, etc. The pulse current value is greater than the preset pulse current threshold, indicating that the current pulse current is larger. In this case, the heat generated by the pulse power supply may be more. The embodiment of the present application reduces the duty cycle of each first power tube in the power tube array unit and reduces the pulse width of the pulse current, thereby reducing the heat generated by the pulse power supply.

[0115] Specifically, reducing the duty cycle of each first power tube in the power tube array unit according to the pulse current threshold to reduce the pulse width of the pulse current may include: reducing the duty cycle of each first power tube in the power tube array unit to determine the pulse width of the pulse current to be the pulse width corresponding to the pulse current threshold (i.e., the target pulse width).

[0116] See also Figure 5In some embodiments, the step 102 of reducing the duty cycle of each first power tube in the power tube array unit according to the pulse current threshold to reduce the pulse width of the pulse current may include but is not limited to steps 201 to 203:

[0117] Step 201, according to the pulse current threshold, search the preset current pulse width relationship table to obtain the target pulse width corresponding to the pulse current threshold;

[0118] Step 202, generating a duty cycle control signal according to the target pulse width;

[0119] Step 203, controlling the duty cycle of each first power tube through a duty cycle control signal so that the pulse width of the pulse current is updated to the target pulse width.

[0120] The advantage of this embodiment is that, according to the pulse current threshold, the preset current pulse width relationship table is searched to obtain the target pulse width corresponding to the pulse current threshold. Then, a duty cycle control signal is generated according to the target pulse width, and the duty cycle of each first power tube is controlled by the duty cycle control signal so that the pulse width of the pulse current is updated to the target pulse width, thereby adjusting the pulse width for different pulse currents, controlling the heat generated by the pulse power supply, thereby improving the energy utilization rate and service life of the pulse power supply, and avoiding damage to the workpiece due to overheating of the pulse power supply.

[0121] In step 201 of some embodiments, the current-pulse-width relationship table is used to characterize the corresponding relationship between different currents and pulse widths.

[0122] In some embodiments, before searching the preset current pulse width relationship table, the pulse power supply may be subjected to current pulse width detection, specifically, the effect of current and pulse width on the heat generated by the pulse power supply is detected. In this process, when a specific current is present, the pulse width corresponding to the current when the heat generated is less is recorded. Then, based on the detection record of the current pulse width detection, the current pulse width relationship table may be determined.

[0123] For example, the current-pulse width relationship table includes but is not limited to the following current-pulse width combinations (see Figure 7The relationship curve between current and pulse width in FIG: (1) the current is 300A (ampere) and the pulse width is 0.1ms (millisecond); (2) the current is 900A and the pulse width is 0.2ms; (3) the current is 1200A and the pulse width is 0.3ms; (4) the current is 1350A and the pulse width is 0.4ms; (5) the current is 1425A and the pulse width is 0.5ms; (6) the current is 1437A and the pulse width is 0.6ms; (7) the current is 1449A and the pulse width is 0.7ms; (8) the current is 1462A and the pulse width is 0.8ms. It can be understood that the above current-pulse width combination can be set and adjusted according to needs. Moreover, the same pulse width can correspond to different current value ranges. For example, a pulse width of 0.8ms can also correspond to a current of 1500A.

[0124] In some embodiments, for example, the current-pulse-width relationship table includes the following correspondence between current and pulse width: for a current in the range of 1450 to 1500 A (including the values ​​at both ends of the range), the corresponding pulse width is 0.8 ms. Assuming that the pulse current threshold is 1462 A, searching the current-pulse-width relationship table shows that 1462 A belongs to [1450, 1500], so the target pulse width is 0.8 ms.

[0125] In step 202 of some embodiments, the duty cycle control signal may be a PWM (Pulse Width Modulation) control signal, or may be other types of control signals, which are not limited herein.

[0126] In step 203 of some embodiments, it can be understood that the duty cycle of the first power tube refers to the ratio of the time the first power tube is in the on state to the time of the entire cycle in one cycle. For example, if one cycle is 10 milliseconds and the first power tube is on for 5 milliseconds, then the duty cycle is 50%.

[0127] See also Figure 6 In some embodiments, after obtaining the pulse current value in step 101, the pulse power supply control method may also include but is not limited to steps 301 to 302:

[0128] Step 301, if the pulse current value is less than a preset pulse current threshold, obtain a target pulse width corresponding to the pulse current threshold;

[0129] Step 302: increasing the duty cycle of each first power tube in the power tube array unit according to the target pulse width, so that the pulse width of the pulse current is updated to the target pulse width.

[0130] The advantage of this embodiment is that when the pulse current value is small, for example, when the pulse current value is less than a preset pulse current threshold, the duty cycle of each first power tube in the power tube array unit can be increased so that the pulse width of the pulse current is updated to the target pulse width, thereby increasing the power of the pulse power supply while ensuring that the thermal effect of the pulse power supply is small.

[0131] In step 301 of some embodiments, the pulse current value is less than a preset pulse current threshold, indicating that the current pulse current is small. For example, the pulse current value is less than 500 A. Specifically, referring to step 201, the current pulse width relationship table can be searched according to the pulse current threshold to obtain the target pulse width corresponding to the pulse current threshold.

[0132] In step 302 of some embodiments, the duty cycle of each first power tube is increased simultaneously by the above-mentioned digital control unit.

[0133] See also Figure 7 and Figure 8 In some embodiments, if pulse currents with different pulse widths and different current values ​​are used to process a workpiece, the workpiece has different temperatures. The temperature of the workpiece can reflect the heat generated by the pulse power supply (pulse power supply circuit, or pulse power supply device), that is, the thermal effect of the pulse power supply. The lower the temperature of the workpiece, the less heat the pulse power supply generates. For example, a pulse current is excited by a numerical control unit in a pulse power supply, thereby outputting the pulse current to the workpiece, and the current value, frequency, and pulse width of the pulse current are collected by an oscilloscope. At the same time, the temperature of the workpiece is measured by a thermal imager. Assuming that the voltage of the pulse power supply is 5V and the frequency is 1Hz, the measurement results of the current value, pulse width, and temperature are as follows. Figure 7 When the pulse current of the pulse power supply acting on the workpiece is 1462A and the pulse width is 0.8ms, the temperature of the workpiece is only 31.2℃ (Celsius). It can be seen that the temperature of the workpiece is low and there is no obvious thermal effect on the surface of the workpiece. The temperature measurement result of the thermal imager is as follows Figure 8 shown.

[0134] It is understandable that in Figure 7 In the figure, the curve with square points is used to represent the relationship between current (i.e. current value) and pulse width. The curve with diamond points is used to represent the relationship between temperature and pulse width. And, since pulse width corresponds to current one by one, Figure 7 The temperature here refers to the temperature of the workpiece at a specific pulse width and the current corresponding to the pulse width. The pulse width has a value range of 0.1 to 0.8 ms. The current has a value range of 300 to 1500 A. The pulse power supply circuit of the embodiment of the present application can ensure that the temperature of the workpiece is around 30°C when processing the workpiece based on the pulse width and current within the above range.

[0135] Understandably, Figure 8 Ar1 in represents a workpiece, and the temperature of the workpiece Ar1 is 31.2° C. Specifically, the workpiece Ar1 may be a third-generation nickel-based single crystal high-temperature alloy, and the size of the workpiece Ar1 is 15*10*1 mm.

[0136] The embodiment of the present application further provides a pulse power supply device, the pulse power supply device comprising: a housing and a circuit board, the circuit board having the above-mentioned pulse power supply circuit;

[0137] The circuit board is arranged inside the shell.

[0138] In some embodiments, the circuit board is a metal printed circuit board, and the substrate of the metal printed circuit board includes an aluminum-based copper clad laminate.

[0139] It should be noted that the metal printed circuit board has a metal substrate. By utilizing the good heat dissipation performance of the large-area metal substrate, the pulse power supply circuit on the metal printed circuit board can be cooled, thereby improving the safety of the pulse power supply device and enabling normal processing of the workpiece under high current conditions. For example, the substrate of the metal printed circuit board can be an aluminum-based copper-clad laminate or an iron-based copper-clad laminate.

[0140] In some embodiments, the pulse power supply device further comprises: a heat sink;

[0141] The heat sink is arranged inside the housing, and the heat sink is attached to the circuit board;

[0142] The heat sink is used to dissipate heat from the pulse power supply circuit of the circuit board.

[0143] The advantage of this embodiment is that the heat sink attached to the circuit board can dissipate heat for the pulse power supply circuit of the circuit board, thereby improving the safety of the pulse power supply device and enabling normal processing of the workpiece under high current conditions.

[0144] Specifically, the heat sink includes any one of a heat sink, a heat pipe, a heat dissipation paste, and a thermal pad.

[0145] The specific implementation of the pulse power supply device is basically the same as the specific implementation of the above-mentioned pulse power supply circuit, and will not be repeated here.

[0146] The embodiment of the present application also provides a controller, the controller includes a memory and a processor, the memory stores a computer program, and the processor implements the above pulse power supply circuit when executing the computer program. The controller can include any intelligent terminal such as a tablet computer and a car computer.

[0147] See also Fig. 9 , Fig. 9 The hardware structure of a controller of another embodiment is illustrated, and the controller includes:

[0148] The processor 901 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0149] The memory 902 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 902 can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 902, and the processor 901 calls and executes the pulse power supply circuit of the embodiment of this application;

[0150] Input / output interface 903, used to implement information input and output;

[0151] Communication interface 904, used to realize communication interaction between the device and other devices, which can be realized by wired mode (such as USB, network cable, etc.) or wireless mode (such as mobile network, WIFI, Bluetooth, etc.);

[0152] A bus 905 that transmits information between the various components of the device (e.g., the processor 901, the memory 902, the input / output interface 903, and the communication interface 904);

[0153] The processor 901 , the memory 902 , the input / output interface 903 and the communication interface 904 are connected to each other in communication within the device via a bus 905 .

[0154] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the above-mentioned pulse power supply circuit is implemented.

[0155] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0156] It should be noted that the non-Company's software tools or components that appear in the embodiments of the present application are merely examples and do not represent actual use.

[0157] The embodiments described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0158] Those skilled in the art will appreciate that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0159] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0160] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0161] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0162] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0163] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. The mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0164] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0165] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0166] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including multiple instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store programs.

[0167] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A pulse power supply circuit, characterized in that: The circuit comprises: a digital control unit, a power tube array unit, and an energy storage array unit; The power tube array unit comprises at least two first power tubes, and any two of the first power tubes are connected in parallel with each other; The digital control unit is electrically connected to each of the first power tubes, and each of the first power tubes is electrically connected to the energy storage array unit; Among them, the energy storage array unit is used to output a pulse current when the first power tube is closed; the digital control unit is used to control the duty cycle of each of the first power tubes to control the pulse width of the pulse current output by the energy storage array unit.

2. The pulse power supply circuit according to claim 1, characterized in that: The maximum value of the pulse current is 1500 amperes, and the number of the first power tubes is 500.

3. The pulse power supply circuit according to claim 2, characterized in that: The energy storage array unit includes at least two supercapacitors; The number of the supercapacitors is 100, and the maximum output current of each supercapacitor is 15 amperes.

4. The pulse power supply circuit according to any one of claims 1 to 3, characterized in that: The circuit further comprises: A power conversion unit, the power conversion unit is electrically connected to the energy storage array unit, and the power conversion unit is used to convert an input AC voltage into a DC voltage.

5. The pulse power supply circuit according to any one of claims 1 to 3, characterized in that: The circuit further comprises: A fixture unit, wherein the fixture unit is electrically connected to the energy storage array unit and the power tube array unit, the fixture unit is used to clampably connect a metal workpiece, and the energy storage array unit outputs a pulse current to process the metal workpiece.

6. A pulse power supply control method, characterized in that: The method is applied to a numerical control unit of a pulse power supply circuit according to any one of claims 1 to 5; The method comprises: Collecting the pulse current output by the energy storage array unit to obtain the pulse current value; If the pulse current value is greater than a preset pulse current threshold, the duty cycle of each first power tube in the power tube array unit is reduced according to the pulse current threshold to reduce the pulse width of the pulse current.

7. The pulse power supply control method according to claim 6, characterized in that: The reducing the duty cycle of each first power tube in the power tube array unit according to the pulse current threshold to reduce the pulse width of the pulse current includes: According to the pulse current threshold, a preset current pulse width relationship table is searched to obtain a target pulse width corresponding to the pulse current threshold; generating a duty cycle control signal according to the target pulse width; The duty cycle of each of the first power tubes is controlled by the duty cycle control signal so that the pulse width of the pulse current is updated to the target pulse width.

8. The pulse power supply control method according to claim 6, characterized in that: After obtaining the pulse current value, the method further includes: If the pulse current value is less than a preset pulse current threshold, obtaining a target pulse width corresponding to the pulse current threshold; The duty cycle of each first power tube in the power tube array unit is increased according to the target pulse width, so that the pulse width of the pulse current is updated to the target pulse width.

9. A controller, characterized in that: The controller includes a memory and a processor, the memory stores a computer program, and the processor implements the pulse power supply control method according to any one of claims 6 to 8 when executing the computer program.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the pulse power supply control method according to any one of claims 6 to 8 is implemented.

Images