CN110504859B - Micro-precise nanosecond pulse power supply device - Google Patents
Micro-precise nanosecond pulse power supply device Download PDFInfo
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- CN110504859B CN110504859B CN201910687756.0A CN201910687756A CN110504859B CN 110504859 B CN110504859 B CN 110504859B CN 201910687756 A CN201910687756 A CN 201910687756A CN 110504859 B CN110504859 B CN 110504859B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/461—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using an operational amplifier as final control device
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/575—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices characterised by the feedback circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M11/00—Power conversion systems not covered by the preceding groups
Abstract
The invention discloses a micro-precise nanosecond pulse power supply device. The first output end of a pulse generator in the device is connected with the input end of a low-voltage isolation driving module, the output end of the low-voltage isolation driving module is connected with the first input end of an amplifying module, and a constant-voltage power supply is connected with the power supply end of the amplifying module; the pulse generator outputs a pulse signal, the pulse signal is subjected to primary low-voltage driving accelerated amplification through the low-voltage isolation driving module, and then secondary high-voltage energy amplification is performed through the amplification module to provide energy for the discharge machining area; the second output end of the pulse generator is connected with the control end of the power regulation output module, and the output end of the power regulation output module is connected with the second input end of the amplification module; and the second output end of the pulse generator outputs a control signal, and after photoelectric coupling is carried out on the control signal through the power regulation output module, the output of the amplification module is regulated. The invention can improve the stability of the pulse power supply, further improve the smoothness of linear cutting processing and improve the processing quality of parts.
Description
Technical Field
The invention relates to the field of pulse power supplies, in particular to a micro-precise nanosecond pulse power supply device.
Background
With the development of the technical level of various industries, the surface quality and the smoothness of the parts machined and manufactured by the electric machining machine tool are further improved by users. In modern power electronics, a novel micro-energy controllable micro-precise nanosecond-level wire cut electrical discharge machining pulse power supply provides technical guarantee for high quality and expansion of the machining field. In practical application, factors influencing the indexes of the micro-precision wire-cut electric discharge machining process are many, and a pulse power supply is a key factor and needs to meet the requirement that the discharge energy is less than 35J when micro-energy machining is carried out. In the fine machining state, the product is eroded by the unevenness of the discharge energy, resulting in a change in the volume of the product, and therefore, the machining process requires a pulsed power source having high stability.
Although the technology of the energy gradual change micro-precision wire cut electrical discharge machining belongs to the field of micro-machining, the actual machining process is divided into rough machining and fine machining. The existing pulse power supply generally only comprises a machining standard, and has a small adjusting range and poor stability.
Disclosure of Invention
The invention aims to provide a micro-precise nanosecond pulse power supply device to improve the stability of a pulse power supply, further improve the smoothness of linear cutting machining and improve the machining quality of parts.
In order to achieve the purpose, the invention provides the following scheme:
a micro-precise nanosecond pulse power supply device comprises: the device comprises a pulse generator, a low-voltage isolation driving module, a power regulation output module, an amplification module and a constant-voltage power supply;
the first output end of the pulse generator is connected with the input end of the low-voltage isolation driving module, the output end of the low-voltage isolation driving module is connected with the first input end of the amplifying module, and the constant-voltage power supply is connected with the power supply end of the amplifying module; a first output end of the pulse generator outputs a pulse signal, after the first-stage low-voltage driving acceleration amplification is carried out through the low-voltage isolation driving module, the second-stage high-voltage energy amplification is carried out through the amplification module to obtain an amplified pulse signal, and the pulse signal provides energy for the electric discharge machining area;
the second output end of the pulse generator is connected with the control end of the power regulation output module, and the output end of the power regulation output module is connected with the second input end of the amplification module; and a second output end of the pulse generator outputs a control signal, and after photoelectric coupling is carried out on the control signal through the power regulation output module, the output of the amplification module is regulated.
Optionally, the pulse generator is a combined structure of a DSP chip of a TMS320C model and a high-speed FPGA chip of an EP1C3 model.
Optionally, the method further includes: the input end of the feedback detection module is connected to the electric discharge machining area, the output end of the feedback detection module is connected with the input end of the pulse generator, and the feedback detection module is used for detecting effective signals of the electric discharge machining area and feeding the effective signals back to the pulse generator.
Optionally, the low-voltage isolation driving module specifically includes: a super-high speed isolation chip and a high speed driver; the input end of the ultra-high speed isolation chip is connected with the first output end of the pulse generator, the output end of the ultra-high speed isolation chip is connected with the input end of the high-speed driver, and the output end of the high-speed driver is connected with the first input end of the amplification module.
Optionally, the amplifying module specifically includes: the device comprises a control chip, a resonance accelerator and a high-voltage ultrahigh-speed power amplifier tube; the input end of the control chip is connected with the output end of the high-speed driver, the input end of the resonance accelerator is connected with the output end of the control chip, and the output end of the resonance accelerator is connected with the output end of the high-voltage ultrahigh-speed power amplification tube; the resonance accelerator is used for accelerating pulse signals into large-current low-voltage driving pulse signals below 100ns, and the high-voltage ultrahigh-speed power amplification tube is used for amplifying the large-current low-voltage driving pulse signals into nanoscale large-current high-voltage pulse signals.
Optionally, the power of the constant voltage power supply is 5 KW.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention reduces the discharge machining pulse output by the power amplifier from the minimum 1us pulse to the machining pulse of 0.1us by the high-speed isolation amplification technology in the low-voltage isolation driving module and the resonance acceleration technology in the amplification module, improves the surface smoothness of the actually machined workpiece from the best Ra1.0 smoothness to Ra0.6 smoothness, improves the wire cutting machining smoothness, simultaneously ensures the stability of the pulse power supply, and further improves the machining quality of parts.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a micro-precise nanosecond pulse power supply device according to the present invention;
fig. 2 is a schematic circuit connection diagram of a low-voltage isolation driving module and an amplifying module in the micro-precise nanosecond pulse power supply device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a micro-precise nanosecond pulse power supply device of the invention. As shown in fig. 1, the micro-precise nanosecond pulse power supply device includes the following structure: the device comprises a pulse generator 1, a low-voltage isolation driving module 2, a power regulation output module 3, an amplification module 4 and a constant-voltage power supply 5. The first output end of the pulse generator 1 is connected with the input end of the low-voltage isolation driving module 2, the output end of the low-voltage isolation driving module 2 is connected with the first input end of the amplifying module 4, and the constant-voltage power supply 5 is connected with the power supply end of the amplifying module 4; the first output end of the pulse generator 1 outputs a pulse signal, after the first-stage low-voltage driving acceleration amplification is carried out through the low-voltage isolation driving module 2, the second-stage high-voltage energy amplification is carried out through the amplification module 4, and the amplified pulse signal is obtained and provides energy for an electric discharge machining area.
A second output end of the pulse generator 1 is connected with a control end of the power regulation output module 3, and an output end of the power regulation output module 3 is connected with a second input end of the amplification module 4; and a second output end of the pulse generator 1 outputs a control signal, and after photoelectric coupling is carried out on the control signal through the power regulation output module 3, the output of the amplification module 4 is regulated.
As another embodiment, the pulse generator 1 is a combined structure of a DSP chip of TMS320C model and a high-speed FPGA chip of EP1C3 model, and a signal source generated by combining a TMS320C high-performance DSP chip of TI (Texas instruments) company and an ALTERA EP1C3 high-speed FPGA chip of ALTERA company can generate adjustable pulses and grouped pulses of 10ns to 1000 us. The low-voltage isolation driving module 2 adopts a high-current ultrahigh-speed isolation driving optical coupling chip to ensure that the pulse signal is effectively transmitted to the amplifying module 4 without distortion. The power regulation output module 3 outputs and controls the power output of the high-voltage power amplifier stage and the voltage output of the power amplifier power supply. The amplifying module 4 amplifies the low-voltage nanosecond pulse into a high-voltage high-current nanosecond pulse to provide energy for the processing area.
As another embodiment, the micro-precise nanosecond pulse power supply device of the present invention further includes: the input end of the feedback detection module 6 is connected to the electric discharge machining area, the output end of the feedback detection module 6 is connected with the input end of the pulse generator 1, and the feedback detection module 6 is used for detecting effective signals of the electric discharge machining area and feeding the effective signals back to the pulse generator 1. The feedback detection module 6 uses a linear optical coupler isolation voltage signal, and then the signal is amplified by a precise operational amplifier and then input to the AD conversion of the CPU for signal acquisition, and the realized detection feedback is also the existing mature technology.
The specific working process of the micro-precise nanosecond pulse power supply device in the embodiment is as follows: the pulse generator 1 outputs a path of pulse signals A and a path of power regulation output control signals B according to the processing setting requirement, and receives a path of C detection feedback signals output by the feedback detection module 6. The A path of output pulse signals are output to the low-voltage isolation driving module 2 for first-stage low-voltage driving acceleration amplification, and then output to the amplification module 4 for second-stage high-voltage energy amplification to provide energy for the discharge machining area E. The B-th path of output control signal is output to the power regulation output module 3 for photoelectric coupling isolation and then output to the amplification module 4, and the output of a power amplification tube of the amplification module 4 is regulated. Meanwhile, the constant voltage power supply 5 provides stable energy with high voltage and large current for the amplification module 4. When the system works, the C-th path detects a feedback input signal to detect the voltage and the current of the feedback processing area in real time and send the detected voltage and the current to the pulse generator 1.
The structures of the low-voltage isolation driving module 2 and the amplifying module 5 in the present invention are specifically described below with reference to fig. 2, and fig. 2 is a schematic circuit connection diagram of the low-voltage isolation driving module and the amplifying module in the micro-precise nanosecond pulse power supply device in the present invention. As shown in fig. 2, the low-voltage isolation driving module 2 specifically includes: an ultra-high speed isolation chip U1 and a high speed driver U2B; the input end of the ultra-high speed isolation chip U1 is connected with the first output end of the pulse generator 1, the output end of the ultra-high speed isolation chip U1 is connected with the input end of the high speed driver U2B, and the output end of the high speed driver U2B is connected with the first input end of the amplification module 4. The amplifying module 4 specifically includes: the control chip U3, the resonance accelerator and the high-voltage ultrahigh-speed power amplifier tube Q1; the input end of the control chip U3 is connected with the output end of the high-speed driver U2B, the input end of the resonance accelerator is connected with the output end of the control chip U3, and the output end of the resonance accelerator is connected with the output end of the high-voltage ultrahigh-speed power amplifying tube Q1; the resonance accelerator is used for accelerating the pulse signal into a large-current low-voltage driving pulse signal below 100ns, and the high-voltage ultra-high-speed power amplifier tube Q1 is used for amplifying the large-current low-voltage driving pulse signal into a nano-scale large-current high-voltage pulse signal.
The pulse generator 1 outputs an A-channel pulse signal MK, the A-channel pulse signal MK is transmitted to a high-speed driver U2B through a U1 ultra-high-speed isolation chip, the MK pulse is amplified and transmitted to a U3 control chip through U2B, the MK pulse is accelerated into a large-current low-voltage driving pulse below 100 nanoseconds by being connected with a resonance accelerator consisting of R2, L1 and C1, the large-current low-voltage driving pulse is output to a high-voltage ultra-high-speed power amplifier Q1 to be amplified, a high-voltage nanosecond large-current high-voltage pulse is output, and the high.
The discharge machining pulse output by the power amplifier is reduced from the minimum 1us pulse to the 0.1us machining pulse by using the resonance accelerator and the high-speed isolation amplification technology, and the surface finish of an actually machined workpiece is improved from the original best Ra1.0 finish to Ra0.6 finish, so that the effect of improving the finish of linear cutting machining by applying the technology is very obvious.
The nanosecond pulse power supply technology is a technology with a wide application prospect, along with the rapid development of the technology, the application of the nanosecond pulse power supply technology in electric discharge machining equipment is necessarily more and more extensive, and through the design work, the machining experiment and other test works of the project, a high-quality high-voltage high-peak pulse power supply with the minimum duration of 100 nanoseconds can be provided for the NH400 linear cutting machine tool of the company. Therefore, the surface quality and the smoothness of the parts processed by the machine tool are further improved, the technical level of the product is improved, and the product has competitive advantage.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (4)
1. A micro-precise nanosecond pulse power supply device is characterized by comprising: the device comprises a pulse generator, a low-voltage isolation driving module, a power regulation output module, an amplification module and a constant-voltage power supply;
the first output end of the pulse generator is connected with the input end of the low-voltage isolation driving module, the output end of the low-voltage isolation driving module is connected with the first input end of the amplifying module, and the constant-voltage power supply is connected with the power supply end of the amplifying module; a first output end of the pulse generator outputs a pulse signal, after the first-stage low-voltage driving acceleration amplification is carried out through the low-voltage isolation driving module, the second-stage high-voltage energy amplification is carried out through the amplification module to obtain an amplified pulse signal, and the pulse signal provides energy for the electric discharge machining area;
the second output end of the pulse generator is connected with the control end of the power regulation output module, and the output end of the power regulation output module is connected with the second input end of the amplification module; a second output end of the pulse generator outputs a control signal, and the control signal is subjected to photoelectric coupling through the power regulation output module and then regulates the output of the amplification module;
the low-voltage isolation driving module specifically comprises: a super-high speed isolation chip and a high speed driver; the input end of the ultra-high-speed isolation chip is connected with the first output end of the pulse generator, the output end of the ultra-high-speed isolation chip is connected with the input end of the high-speed driver, and the output end of the high-speed driver is connected with the first input end of the amplification module;
the amplifying module specifically comprises: the device comprises a control chip, a resonance accelerator and a high-voltage ultrahigh-speed power amplifier tube; the input end of the control chip is connected with the output end of the high-speed driver, the input end of the resonance accelerator is connected with the output end of the control chip, and the output end of the resonance accelerator is connected with the output end of the high-voltage ultrahigh-speed power amplification tube; the resonance accelerator is used for accelerating a pulse signal into a large-current low-voltage driving pulse signal below 100ns, and the high-voltage ultrahigh-speed power amplification tube is used for amplifying the large-current low-voltage driving pulse signal into a nano-scale large-current high-voltage pulse signal;
and the electric discharge machining pulse output by the pulse generator is reduced from the minimum 1 mu s pulse to the machining pulse of 0.1 mu s by a high-speed isolation amplification technology in the low-voltage isolation driving module and a resonance acceleration technology in the amplification module.
2. The micro-precise nanosecond pulse power supply device according to claim 1, wherein the pulse generator is a combination structure of a DSP chip of a TMS320C model and a high-speed FPGA chip of an EP1C3 model.
3. The micro-precise nanosecond pulsed power supply device according to claim 1, further comprising: the input end of the feedback detection module is connected to the electric discharge machining area, the output end of the feedback detection module is connected with the input end of the pulse generator, and the feedback detection module is used for detecting effective signals of the electric discharge machining area and feeding the effective signals back to the pulse generator.
4. A micro-precise nanosecond pulse power supply device according to claim 1, wherein the power of said constant voltage power supply is 5 KW.
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