CN115085699A - Electric spark pulse discharge power supply device and control system thereof - Google Patents
Electric spark pulse discharge power supply device and control system thereof Download PDFInfo
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- CN115085699A CN115085699A CN202210595776.7A CN202210595776A CN115085699A CN 115085699 A CN115085699 A CN 115085699A CN 202210595776 A CN202210595776 A CN 202210595776A CN 115085699 A CN115085699 A CN 115085699A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
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Abstract
The invention provides an electric spark pulse discharge power supply device and a control system thereof, comprising an adjustable voltage input circuit, a pulse waveform generator and a drive protection circuit; the adjustable voltage input circuit is used for being connected with a power grid, the pulse waveform generator is used for being connected with the controller, the output end of the adjustable voltage input circuit and the output end of the pulse waveform generator are respectively connected with the first input end and the second input end of the driving protection circuit, and the driving protection circuit is used for being connected with the working electrode and the object to be processed; the adjustable voltage input circuit and the pulse waveform generator are respectively configured to provide an adjustable direct current voltage and an adjustable pulse waveform signal for the driving protection circuit; the drive protection circuit is configured to apply a voltage to the working electrode and the object to be processed according to the direct-current voltage and the pulse waveform signal, and to stop connection with the pulse waveform generator when an overcurrent occurs during the processing. The problem of current numerical control spark-erosion wire cutting machine bed because the monopulse width is too big, makes the local temperature of processing rise to slow down the processing speed is solved.
Description
Technical Field
The invention relates to the technical field of wire cut electrical discharge machining, in particular to an electrical discharge pulse discharge power supply device and a control system thereof.
Background
Wire Electric Discharge Machining (WEDM) is one of the most widely applied part machining methods at present, and particularly has wide application in the fields of die industry, aerospace industry and the like. The wire-electrode cutting machine is mainly used for machining various workpieces with complex and precise shapes, such as male dies, female dies, male dies and female dies of blanking dies, forming tools, templates, metal electrodes for electric spark forming machining, various fine hole grooves, narrow slits, arbitrary curves and the like, has the outstanding advantages of small machining allowance, high machining precision, short production period, low manufacturing cost and the like, and is widely applied to production.
The existing numerical control wire cut electric discharge machine in the market commonly uses two output waveforms of rectangular wave pulse and grouped pulse, and different pulse waveforms can be selected according to different processing requirements. Grouping pulses are usually selected for finish machining and thin workpiece machining, under specific process conditions, along with the increase of pulse width, the cutting speed of the numerical control wire cut electric discharge machine is increased, the surface roughness of a machined product is increased, the trend is at the initial stage of the increase of the pulse width, the machining speed is increased quickly, but along with the further increase of the pulse width, the increase of the machining speed is relatively gentle, the change trend of the roughness is also same, at the moment, because the single pulse width is too large, namely the single pulse discharge time is too long, the temperature of the local position machined by the numerical control wire cut electric discharge machine is increased, the machining amount of the opposite side is increased, the heat dissipation is quick, the machining speed of the numerical control wire cut electric discharge machine is slowed down, and the production efficiency of the numerical control wire cut electric discharge machine is further influenced.
In view of this, the present application is proposed.
Disclosure of Invention
The invention aims to provide an electric spark pulse discharge power supply device and a control system thereof, and aims to solve the problems that the temperature of a local position machined by a numerical control electric spark wire cutting machine tool is increased due to overlarge single pulse width, namely overlong single pulse discharge time, the machined amount of a side is increased, heat dissipation is high, the machining speed of the numerical control electric spark wire cutting machine tool is slowed down, and the production efficiency of the numerical control electric spark wire cutting machine tool is influenced in the prior art.
The invention provides an electric spark pulse discharge power supply device, which comprises an adjustable voltage input circuit, a pulse waveform generator and a drive protection circuit, wherein the adjustable voltage input circuit is connected with the pulse waveform generator;
the input end of the adjustable voltage input circuit is used for being connected with a power grid, the output end of the adjustable voltage input circuit is electrically connected with the first input end of the driving protection circuit, the input end of the pulse waveform generator is used for being connected with a controller, the output end of the pulse waveform generator is electrically connected with the second input end of the driving protection circuit, and the output end of the driving protection circuit is used for being connected with a working electrode and an object to be processed;
the adjustable voltage input circuit is configured to perform rectification and voltage stabilization processing on voltage input by a power grid and provide the processed adjustable direct-current voltage to the drive protection circuit;
wherein the pulse waveform generator is configured to provide an adjustable pulse waveform signal to the drive protection circuit;
the drive protection circuit is configured to apply voltage to the working electrode and the object to be processed according to the direct current voltage and the pulse waveform signal, and stop connection with the pulse waveform generator when overcurrent occurs in the processing process.
Preferably, the adjustable voltage input circuit comprises an alternating current transformer, a rectification filter circuit and a voltage stabilizing circuit;
the input end of the alternating current transformer is used for being connected with a power grid, the output end of the alternating current transformer is electrically connected with the input end of the rectification filter circuit, the output end of the rectification filter circuit is electrically connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is electrically connected with the first input end of the drive protection circuit.
Preferably, the rectification filter circuit comprises a single-phase full-bridge rectification circuit and a capacitor filter circuit, wherein the input end of the single-phase full-bridge rectification circuit is electrically connected with the output end of the alternating current transformer, the output end of the single-phase full-bridge rectification circuit is electrically connected with the input end of the capacitor filter circuit, and the output end of the capacitor filter circuit is electrically connected with the input end of the voltage stabilizing circuit.
Preferably, the driving protection circuit comprises a driver, a first diode, a second diode, a triode, a first resistor, a second resistor, a third capacitor, a driving signal input circuit and an overcurrent protection circuit;
wherein, the first input end of the driver is electrically connected with the output end of the voltage stabilizing circuit, the second input end of the driver is electrically connected with the output end of the driving signal input circuit, the input end of the driving signal input circuit is electrically connected with the output end of the pulse waveform generator, the collector monitoring end of the driver is electrically connected with the anode of the first diode, the cathode of the first diode is used for being connected with a first power supply, the power end of the driver is used for being connected with a second power supply, the ground end of the driver is grounded, the output end of the driver is electrically connected with one end of the first resistor, the other end of the first resistor is electrically connected with the base of the triode, the collector of the triode is electrically connected with the cathode of the first diode, and the emitter of the triode is used for being connected with a working electrode and an object to be processed, one end of the second resistor and the cathode of the second diode are used for being connected with a first power supply, the other end of the second resistor and the anode of the second diode are electrically connected with one end of the third capacitor, the other end of the third capacitor is used for being connected with a working electrode and an object to be processed, and the overcurrent protection end of the driver is electrically connected with the second input end of the overcurrent protection circuit.
Preferably, the driver further comprises a third resistor, an output end of the voltage stabilizing circuit is electrically connected with one end of the third resistor, and the other end of the third resistor is electrically connected with the first input end of the driver.
Preferably, the power supply further comprises a first capacitor and a second capacitor, one end of the first capacitor and one end of the second capacitor are used for being connected with a second power supply, and the other end of the first capacitor and the other end of the second capacitor are grounded.
Preferably, the driving signal input circuit includes an and gate module and a switching tube, a first input end of the and gate module is electrically connected to an output end of the pulse waveform generator, a second input end of the and gate module is electrically connected to a first end of the overcurrent protection circuit, an output end of the and gate module is electrically connected to a gate of the switching tube, a source of the switching tube is grounded, and a drain of the switching tube is electrically connected to a second input end of the driver.
Preferably, the over-current protection circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a third diode and a photocoupler, one end of the fourth resistor is electrically connected with the output end of the voltage stabilizing circuit, the other end of the fourth resistor is electrically connected with the anode of the third diode, the cathode of the third diode is electrically connected with one end of the sixth resistor and the second input end of the AND gate module, the other end of the sixth resistor is grounded, one end of the fifth resistor is used for being connected with a second power supply, the other end of the fifth resistor is electrically connected with a first input end of the photoelectric coupler, a second input end of the photoelectric coupler is electrically connected with an overcurrent protection end of the driver, and the first output end of the photoelectric coupler is electrically connected with the anode of the third diode, and the second output end of the photoelectric coupler is grounded.
The invention also provides an electric spark pulse discharge power supply control system which comprises a controller and the electric spark pulse discharge power supply device, wherein the output end of the controller is electrically connected with the input end of the pulse waveform generator.
Preferably, the controller is an S3C2410 microprocessor based on an ARM9 core.
In summary, according to the electric spark pulse discharge power supply device and the control system thereof provided by this embodiment, after ac power is connected to a power grid and is subjected to a series of voltage transformation, rectification filtering and voltage stabilization, an adjustable dc power within a preset range is obtained, and the adjustable dc power is subjected to the drive protection circuit to obtain a voltage-current adjustable pulse power supply with a required pulse width and duty ratio, wherein a drive input signal required by the drive protection circuit is provided by the pulse waveform generator, and pulse parameters required by the pulse waveform generator are provided by the controller; thereby solve the numerical control spark-erosion wire cutting machine among the prior art because the monopulse width is too big, monopulse discharge time overlength promptly, can make the local position temperature of numerical control spark-erosion wire cutting machine processing rise, form the increase to the amount of processing on the side, the heat gives off fast for the machining speed of numerical control spark-erosion wire cutting machine slows down, and then influences its production efficiency's problem.
Drawings
Fig. 1 is a schematic structural diagram of an electric spark pulse discharge power supply device according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a driving protection circuit of an electric spark pulse discharge power supply device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Referring to fig. 1, a first embodiment of the present invention provides an electric spark pulse discharge power supply device, which includes an adjustable voltage input circuit 1, a pulse waveform generator CPLD, and a driving protection circuit 2;
the input end of the adjustable voltage input circuit 1 is used for being connected with a power grid, the output end of the adjustable voltage input circuit 1 is electrically connected with the first input end of the driving protection circuit 2, the input end of the pulse waveform generator CPLD is used for being connected with a controller, the output end of the pulse waveform generator CPLD is electrically connected with the second input end of the driving protection circuit 2, and the output end of the driving protection circuit 2 is used for being connected with a working electrode and an object to be processed;
the adjustable voltage input circuit 1 is configured to perform rectification and voltage stabilization processing on the voltage input by the power grid, and provide the processed adjustable direct-current voltage to the drive protection circuit 2;
wherein the pulse waveform generator CPLD is configured to provide an adjustable pulse waveform signal to the drive protection circuit 2;
wherein the drive protection circuit 2 is configured to apply a voltage to the working electrode and the object to be processed according to the dc voltage and the pulse waveform signal, and to stop connection with the pulse waveform generator CPLD when an overcurrent occurs during processing.
At present, the voltage of a pulse power supply of a numerical control wire-cut electric discharge machine tool is different according to the thickness of a workpiece to be machined, and generally, the voltage of the pulse power supply mainly takes no-load voltage as a value voltage, wherein the no-load voltage is the voltage of a high-frequency pulse power supply which is switched on but does not machine the workpiece; along with the change of the thickness of a machined workpiece, the no-load voltage should be correspondingly changed, and the value range of most no-load voltages is generally between 50 and 100V. At present, a numerical control wire-cut electric discharge machine adopting grouped pulses is adopted in the market, when the grouped pulse machining is carried out, the machining with high requirement on surface roughness is carried out, the pulse width is about 10us, the pulse gap is about 10us, when the medium roughness is required or rough machining is carried out, the pulse width is 10-25 us, and the pulse gap is 10-25 us. The grouping width is set to be 5-15 times of the pulse width and the value between pulses, and the grouping interval is generally required to enable the total pulse width to be larger than 4 times of the total pulse width. The grouping interval value is mainly considered in machining stability, short circuit prevention and chip removal requirements, and on the premise of meeting the requirements, the grouping interval is usually reduced to obtain higher machining speed, and the pulse power supply can improve machining efficiency and simultaneously give consideration to smoothness. However, in the prior art, the pulse width of the numerical control wire-cut electric discharge machine adopting the grouped pulses is increased under a specific process condition, the cutting speed is increased, the surface roughness is increased, the processing speed is increased rapidly at the initial stage of the increase of the pulse width, but the processing speed is increased relatively gently along with the further increase of the pulse width, the change trend of the roughness is the same, at this time, because the single pulse width is too large, namely the single pulse discharge time is too long, the local temperature of the machine tool is increased, the processing amount of the opposite side is increased, the heat dissipation is rapid, the processing speed of the machine tool is slowed down, and the processing efficiency is further influenced. Moreover, the traditional numerical control wire cut electric discharge machine mainly adopts a mode of adopting a single chip microcomputer as a main controller and a mode of combining the single chip microcomputer with a special motion control card, but the two control modes have the problems of low system function, low computer processing speed and inconvenience in man-machine interaction, and the mode of combining the single chip microcomputer with the special motion control card also has the defects of increased system cost and huge system volume.
Specifically, in the present embodiment, the spark pulse discharge power supply apparatus is configured to generate a discharge state by applying a voltage between two electrodes (i.e., a machining electrode and a workpiece) via an insulating liquid between the electrodes and gradually approaching the distance between the two electrodes, and to blow a workpiece material from a portion where the discharge occurs by an air flow in accordance with a high voltage generated by the discharge while melting and vaporizing the workpiece; the electric spark pulse discharge power supply device performs discharge machining by repeating tens of thousands, even tens of thousands of times within 1 second. When the electric spark pulse discharge power supply device is used for high-speed machining, a power supply loop flowing 1000A current within 1 microsecond is used for controlling pulse output of the current, and pulse current is repeated and stably generated; when the electric spark pulse discharge power supply device is further processed finely, pulse current is repeated and stably generated by nanosecond pulse control.
In this embodiment, ac power received from a power grid is subjected to a series of transformation, rectification, filtering, and voltage stabilization to obtain an adjustable dc power within a preset range, and the adjustable dc power is subjected to the driving protection circuit 2 to obtain a voltage-current adjustable pulse power supply with a required pulse width and duty ratio, wherein a driving input signal required by the driving protection circuit 2 is provided by the pulse waveform generator CPLD, and a pulse parameter required by the pulse waveform generator CPLD is provided by the controller ARM; thereby solve the numerical control spark-erosion wire cutting machine among the prior art because the monopulse width is too big, monopulse discharge time overlength promptly, can make the local position temperature of numerical control spark-erosion wire cutting machine processing rise, form the increase to the amount of processing on the side, the heat gives off fast for the machining speed of numerical control spark-erosion wire cutting machine slows down, and then influences its production efficiency's problem.
Specifically, in this embodiment, the pulse waveform generator CPLD may be a CPLD chip MAX7128S, which is integrated by high-density logic, and has a reasonable cost performance; the counting working frequency reaches 175MHz, and the counting working frequency comprises 2500 logic gates, 128 macro units and 68 configurable I/O ports; the on-line programming can be realized through a JTAG interface, a chip does not need to be pulled down and re-burnt, and a compiled logic data file can be burnt into a chip through a serial port of a PC (personal computer), so that the logic debugging is convenient, and the erasing can be carried out for hundreds of times; and a single 5V power supply can be used, and the power supply can be directly connected with chip interfaces such as ARM, TTL and the like. The pulse waveform generator generates a pulse waveform and provides a pulse signal of a pulse power supply for the driving protection circuit.
The frequency synthesis part of the pulse waveform generator CPLD performs frequency synthesis on the signal generated by the crystal oscillator to generate the required signal frequency, and the synthesized signal frequency f o From crystal frequency f i And the frequency synthesis constant D, the precision and the fineness of the adjustment being determined by the number of binary bits N of the digital frequency synthesizer, by the formula f o ＝f i ×D/2 N … (1). With a crystal oscillator of 16MHz (i.e. f) i 16MHz), as can be derived from equation (1),
namely, it is
Wherein f is omax Is the maximum value of the output signal frequency; take N as 16 and getFormula (2) is formula D max ＝2 15 ×10 -3 Thus, when N is 16, D takes the maximum value D max ＝2 15 ×10 -3 Time, output signal frequency f omax ＝8×10 3 Hz; when N is 16, D is 2 12 ×10 -3 When the frequency f of the output signal is 1 × 10 3 Hz; when N is 16, D is 2 10 ×10 -3 When the frequency f of the output signal is 0.25 × 10 3 HzHz. As can be seen from the above example, as long as different parameters are set for the frequency synthesis constant D of the pulse waveform generator CPLD, the pulse waveform generator CPLD outputs a corresponding frequency signal, that is, outputs a pulse waveform with a frequency of 0 to 8KHz, and power signals with different frequencies can be generated by the pulse waveform generator CPLD according to other values of the frequency synthesis constant D.
When the electric spark pulse discharge power supply device is to generate a signal with a period of T pulse waveform and adjustable duty ratio, a preset value is provided for a 10-bit counter in the pulse waveform generator, a duty ratio parameter is set by K, the K value range is 0-1024, the parameter is input into the CPLD through a controller ARM, when a working counter reaches the timing time, a time-to-signal is sent to a duty ratio control circuit, the control circuit stops working of the counter after receiving the signal and reloads the counter data, so that a pulse signal with a specified duty ratio and a period of T pulse width is generated, and the generated signal has the pulse width range of T 1 K × T/1024 … (3), resulting in a duty cycle of Q — T 1 /T × 100% … (4), where T is the generation period, T 1 The value range of K is 0-1024 for the pulse width range of the generated signal, and is the duty ratio generated by Q.
In one possible embodiment of the present invention, the adjustable voltage input circuit 1 includes an alternating current transformer AC, a rectifying and filtering circuit 11, and a voltage stabilizing circuit 12;
the input end of the alternating current transformer AC is used for being connected with a power grid, the output end of the alternating current transformer AC is electrically connected with the input end of the rectification filter circuit 11, the output end of the rectification filter circuit 11 is electrically connected with the input end of the voltage stabilizing circuit 12, and the output end of the voltage stabilizing circuit 12 is electrically connected with the first input end of the drive protection circuit 2.
The rectifying and filtering circuit 11 comprises a single-phase full-bridge rectifying circuit 111 and a capacitor filtering circuit 112, the input end of the single-phase full-bridge rectifying circuit 111 is electrically connected with the output end of the alternating current transformer AC, the output end of the single-phase full-bridge rectifying circuit 111 is electrically connected with the input end of the capacitor filtering circuit 112, and the output end of the capacitor filtering circuit 112 is electrically connected with the input end of the voltage stabilizing circuit 12.
Specifically, in this embodiment, for example, the 220V AC power is input from the power grid, the 220V AC power is stepped down by the AC transformer AC, and then passes through the single-phase full-bridge rectification circuit 111 and the capacitor filter circuit 112, so as to obtain 100V dc power; the obtained 100V direct current is subjected to current voltage stabilization through the voltage stabilizing circuit 12 to obtain 0-100V adjustable direct current, and the adjustable direct current is transmitted to the driving protection circuit 2, and the driving protection circuit 2 finally outputs a voltage and current adjustable pulse power supply with required pulse width and duty ratio. It should be noted that, in other embodiments, other types of adjustable voltage input circuits may also be used, which are not specifically limited herein, but these schemes are all within the protection scope of the present invention.
Referring to fig. 2, in one possible embodiment of the present invention, the driving protection circuit 2 includes a driver L1, a first diode D1, a second diode D2, a transistor Q1, a first resistor R1, a second resistor R2, a third capacitor C3, a driving signal input circuit 21, and an overcurrent protection circuit 22;
wherein, a first input end of the driver L1 is electrically connected to an output end of the voltage stabilizing circuit 12, a second input end of the driver L1 is electrically connected to an output end of the driving signal input circuit 21, an input end of the driving signal input circuit 21 is electrically connected to an output end of the pulse waveform generator CPLD, a collector monitor end of the driver L1 is electrically connected to an anode of the first diode D1, a cathode of the first diode D1 is used for being connected to a first power source VCC1, a power source end of the driver L1 is used for being connected to a second power source VCC2, a ground end of the driver L1 is grounded, an output end of the driver L1 is electrically connected to one end of the first resistor R1, the other end of the first resistor R1 is electrically connected to a base of the triode Q1, a collector of the triode Q1 is electrically connected to a cathode of the first diode D1, an emitting electrode of the triode Q1 is used for being connected with a working electrode and an object to be processed, one end of the second resistor R2 and a cathode of the second diode D2 are used for being connected with the first power source VCC1, the other end of the second resistor R2 and an anode of the second diode D2 are electrically connected with one end of the third capacitor C3, the other end of the third capacitor C3 is used for being connected with the working electrode and the object to be processed, and an overcurrent protection end of the driver L1 is electrically connected with a second input end of the overcurrent protection circuit 22. The output end of the voltage stabilizing circuit 12 is electrically connected with one end of the third resistor R3, and the other end of the third resistor R3 is electrically connected with the first input end of the driver L1.
Specifically, in this embodiment, the driver L1 may be an integrated dedicated IGBT driver EXB840, a driving input signal of the driver L1 is provided by the pulse waveform generator CPLD, a power supply of the driver L1 is connected to a +20V power supply, a first input end of the driver L1 receives the adjustable dc power of 0-100V generated by the adjustable voltage input circuit 1, and a second input end of the driver L1 receives the pulse waveform signal generated by the pulse waveform generator CPLD; and the driver L1 transmits the generated voltage and current adjustable pulse power supply with the required pulse width and duty ratio to the working electrode and the workpiece to be processed so as to control the operation of the numerical control wire cut electric discharge machine. It should be noted that, in other embodiments, other types of driving protection circuits may also be used, which are not specifically limited herein, but these schemes are all within the protection scope of the present invention.
In one possible embodiment of the present invention, the present invention further includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 and one end of the second capacitor C2 are used for connecting to a second power VCC2, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are grounded.
Specifically, in this embodiment, the first capacitor C1 and the second capacitor C2 are filter capacitors, and the wave capacitor is an energy storage device installed at two ends of the circuit to reduce the ripple factor of the ac pulse and improve the high-efficiency smooth dc output. The first capacitor C1 and the second capacitor C2 are used in the driving protection circuit to filter out ac components and make the output dc smoother.
In one possible embodiment of the present invention, the driving signal input circuit 21 includes an and gate module 211 and a switch Q2211, a first input end of the and gate module is electrically connected to the output end of the pulse waveform generator CPLD, a second input end of the and gate module 211 is electrically connected to the first end of the over-current protection circuit 22, an output end of the and gate module 211 is electrically connected to the gate of the switch Q2, a source of the switch Q2 is grounded, and a drain of the switch Q2 is electrically connected to the second input end of the driver L1.
The over-current protection circuit 22 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third diode D3, and a photo-coupler L2, one end of the fourth resistor R4 is electrically connected to the output end of the voltage regulator circuit 12, the other end of the fourth resistor R4 is electrically connected to the anode of the third diode D3, the cathode of the third diode D3 is electrically connected to one end of the sixth resistor R6 and the second input end of the and gate module 211, the other end of the sixth resistor R6 is grounded, one end of the fifth resistor R5 is used to be connected to the second power source VCC2, the other end of the fifth resistor R5 is electrically connected to the first input end of the photo-coupler L2, the second input end of the photo-coupler L2 is electrically connected to the over-current protection end of the driver L1, the first output end of the photo-coupler L2 is electrically connected to the anode of the third diode D3, a second output terminal of the optocoupler L2 is connected to ground.
Specifically, in this embodiment, the photocoupler L2 may be a photocoupler TLP521, and the and gate module 211 may be an and gate 74LS 08; when the overcurrent protection end of the driver L1 generates overcurrent, the photocoupler L2 connected to the overcurrent protection end of the driver L1 is turned on, and the level of the second input end of the and gate module 211 is pulled low, so that the pulse signal of the pulse waveform generator CPLD is turned off, and the drive protection circuit 2 is protected. The photoelectric coupler L2 ensures that the input signal has no influence on the output signal, and meanwhile, the photoelectric coupler L2 has strong anti-jamming capability, so that the reliability of the circuit is ensured.
As described above, the spark pulse discharge power supply device can control the discharge pulse by controlling the method of supplying the discharge energy, the supply time, and the inter-electrode distance, and thus can exhibit excellent discharge processing performance; the fine machining loop of the ultra-high frequency digital pulse can generate stable peak current of more than 1000A within 1 nanosecond, greatly improves the control of vertical precision, improves the surface roughness, the arching amount and the shape precision of the corner part in the machining process, and realizes the coexistence of high-speed machining and high-precision machining with overwhelming performance.
The invention provides an electric spark pulse discharge power supply control system, which comprises a controller ARM and the electric spark pulse discharge power supply device, wherein the output end of the controller ARM is electrically connected with the input end of the pulse waveform generator CPLD.
In one possible embodiment of the invention, the controller ARM may be an S3C2410 microprocessor based on an ARM9 core.
Specifically, in this embodiment, the S3C2410 microprocessor expands rich peripheral interfaces and management modules, including Nand Flash controller, USB master-slave controller, UART controller, real-time clock, clock/power management module, and so on, with rich functions and wide applications. It should be noted that, in other embodiments, other types of controllers can also be used, which are not specifically limited herein, but these schemes are all within the protection scope of the present invention.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention.
Claims (10)
1. An electric spark pulse discharge power supply device is characterized by comprising an adjustable voltage input circuit, a pulse waveform generator and a drive protection circuit;
the input end of the adjustable voltage input circuit is used for being connected with a power grid, the output end of the adjustable voltage input circuit is electrically connected with the first input end of the driving protection circuit, the input end of the pulse waveform generator is used for being connected with a controller, the output end of the pulse waveform generator is electrically connected with the second input end of the driving protection circuit, and the output end of the driving protection circuit is used for being connected with a working electrode and an object to be processed;
the adjustable voltage input circuit is configured to perform rectification and voltage stabilization processing on voltage input by a power grid and provide the processed adjustable direct-current voltage to the drive protection circuit;
wherein the pulse waveform generator is configured to provide an adjustable pulse waveform signal to the drive protection circuit;
the drive protection circuit is configured to apply voltage to the working electrode and the object to be processed according to the direct current voltage and the pulse waveform signal, and stop connection with the pulse waveform generator when overcurrent occurs in the processing process.
2. The spark pulse discharge power supply unit according to claim 1, wherein said adjustable voltage input circuit includes an ac transformer, a rectifying filter circuit, and a voltage stabilizing circuit;
the input end of the alternating current transformer is used for being connected with a power grid, the output end of the alternating current transformer is electrically connected with the input end of the rectification filter circuit, the output end of the rectification filter circuit is electrically connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is electrically connected with the first input end of the drive protection circuit.
3. The electrical discharge spark pulse power supply device according to claim 2, wherein the rectifying and filtering circuit includes a single-phase full-bridge rectifying circuit, an input terminal of which is electrically connected to the output terminal of the alternating current transformer, and a capacitive filtering circuit, an output terminal of which is electrically connected to the input terminal of the capacitive filtering circuit, and an output terminal of which is electrically connected to the input terminal of the voltage stabilizing circuit.
4. The electric spark pulse discharge power supply device according to claim 2, wherein the drive protection circuit includes a driver, a first diode, a second diode, a triode, a first resistor, a second resistor, a third capacitor, a drive signal input circuit, and an overcurrent protection circuit;
wherein, the first input end of the driver is electrically connected with the output end of the voltage stabilizing circuit, the second input end of the driver is electrically connected with the output end of the driving signal input circuit, the input end of the driving signal input circuit is electrically connected with the output end of the pulse waveform generator, the collector monitoring end of the driver is electrically connected with the anode of the first diode, the cathode of the first diode is used for being connected with a first power supply, the power end of the driver is used for being connected with a second power supply, the ground end of the driver is grounded, the output end of the driver is electrically connected with one end of the first resistor, the other end of the first resistor is electrically connected with the base of the triode, the collector of the triode is electrically connected with the cathode of the first diode, and the emitter of the triode is used for being connected with a working electrode and an object to be processed, one end of the second resistor and the cathode of the second diode are used for being connected with a first power supply, the other end of the second resistor and the anode of the second diode are electrically connected with one end of the third capacitor, the other end of the third capacitor is used for being connected with a working electrode and an object to be processed, and the overcurrent protection end of the driver is electrically connected with the second input end of the overcurrent protection circuit.
5. The spark pulse discharge power supply unit as claimed in claim 4, further comprising a third resistor, wherein an output terminal of the voltage stabilizing circuit is electrically connected to one terminal of the third resistor, and the other terminal of the third resistor is electrically connected to the first input terminal of the driver.
6. The electric spark pulse discharge power supply device according to claim 4, further comprising a first capacitor and a second capacitor, wherein one end of the first capacitor and one end of the second capacitor are used for connecting with a second power supply, and the other end of the first capacitor and the other end of the second capacitor are grounded.
7. The electrical discharge spark pulse power supply device according to claim 4, wherein the driving signal input circuit comprises an and gate module and a switching tube, a first input end of the and gate module is electrically connected with the output end of the pulse waveform generator, a second input end of the and gate module is electrically connected with a first end of the over-current protection circuit, an output end of the and gate module is electrically connected with a gate of the switching tube, a source of the switching tube is grounded, and a drain of the switching tube is electrically connected with a second input end of the driver.
8. The electrical discharge spark pulse power supply unit according to claim 7, wherein the over-current protection circuit includes a fourth resistor, a fifth resistor, a sixth resistor, a third diode, and a photo-coupler, one end of the fourth resistor is electrically connected to the output terminal of the voltage regulator circuit, the other end of the fourth resistor is electrically connected to the anode of the third diode, the cathode of the third diode is electrically connected to one end of the sixth resistor and the second input terminal of the and gate module, the other end of the sixth resistor is grounded, one end of the fifth resistor is used for being connected to the second power supply, the other end of the fifth resistor is electrically connected to the first input terminal of the photo-coupler, the second input terminal of the photo-coupler is electrically connected to the over-current protection terminal of the driver, and the first output terminal of the photo-coupler is electrically connected to the anode of the third diode, and the second output end of the photoelectric coupler is grounded.
9. An electric spark pulse discharge power supply control system, characterized by comprising a controller and an electric spark pulse discharge power supply device as claimed in any one of claims 1 to 8, wherein an output terminal of the controller is electrically connected with an input terminal of the pulse waveform generator.
10. The spark pulse discharge power supply control system as claimed in claim 9, wherein said controller is an S3C2410 microprocessor based on an ARM9 core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210595776.7A CN115085699A (en) | 2022-05-30 | 2022-05-30 | Electric spark pulse discharge power supply device and control system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210595776.7A CN115085699A (en) | 2022-05-30 | 2022-05-30 | Electric spark pulse discharge power supply device and control system thereof |
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| Publication Number | Publication Date |
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| CN115085699A true CN115085699A (en) | 2022-09-20 |
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| CN202210595776.7A Pending CN115085699A (en) | 2022-05-30 | 2022-05-30 | Electric spark pulse discharge power supply device and control system thereof |
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| Country | Link |
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| CN (1) | CN115085699A (en) |
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2022
- 2022-05-30 CN CN202210595776.7A patent/CN115085699A/en active Pending
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