CN116470786A - Switch capacitance type pulse power supply for electric spark machining - Google Patents
Switch capacitance type pulse power supply for electric spark machining Download PDFInfo
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- CN116470786A CN116470786A CN202310497784.2A CN202310497784A CN116470786A CN 116470786 A CN116470786 A CN 116470786A CN 202310497784 A CN202310497784 A CN 202310497784A CN 116470786 A CN116470786 A CN 116470786A
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- 238000003754 machining Methods 0.000 title claims abstract description 61
- 238000010892 electric spark Methods 0.000 title claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims abstract description 65
- 230000015556 catabolic process Effects 0.000 claims abstract description 14
- 238000009760 electrical discharge machining Methods 0.000 claims description 10
- 238000002242 deionisation method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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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
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention provides a switched capacitor type pulse power supply for electric spark machining, which comprises the following components: the switching capacitor type step-up and step-down circuit comprises a switching capacitor type step-up and step-down circuit, a direct current voltage source, an FPGA control circuit and a driving circuit, wherein the switching capacitor type step-up and step-down circuit is used for carrying out gap breakdown and machining discharge in electric spark machining, the direct current voltage source is used for outputting direct current voltage to supply power for the switching capacitor type step-up and step-down circuit, the FPGA control circuit is used for providing control signals for the driving circuit, and the driving circuit is used for controlling the on and off of a switching tube in the switching capacitor type step-up and step-down circuit after amplifying the control signals output by the FPGA. The invention can realize the buck-boost function, solves the problems of complex topology of a high-low voltage composite structure and output capacitance of a single-stage pulse power supply, and has the advantages of no right half plane zero point, simple control circuit, quick dynamic response, equal inductance current to load current, high processing efficiency, small stress of a switching tube and the like.
Description
Technical Field
The invention relates to the field of pulse power supplies for electric spark machining, in particular to a switched capacitor type pulse power supply for electric spark machining.
Background
With the development of modern industry, international trade friction and technological competition are aggravated, and the demands for autonomous guarantee of key core parts are becoming urgent in the fields of aerospace, microelectronic manufacturing, automobile manufacturing and the like in China. Spark machining is a non-contact special machining technique that uses controllable electrical energy to form spark discharge between a tool electrode and a workpiece, removing the material being machined. Compared with the traditional machining, the electric spark machining can be used for machining special metal materials with high hardness, high strength, high melting point and the like and some precise parts with special structures and complex shapes. The electric spark processing is divided into three stages of breakdown delay, electric discharge processing and deionization. In the breakdown delay stage, a pulse power supply is required to provide a high-voltage breakdown gap for the gap; in the electric discharge machining stage, the gap characteristic is a quasi-maintaining voltage of about 20V; in the deionization stage, the pulsed power supply no longer supplies energy to the gap, which gradually recovers the insulating properties. For a single-stage pulse power supply applied to electric spark machining, an output capacitor cannot exist at the output end in the electric discharge machining stage, so that the inductance current is required to be equal to the gap current for ensuring the machining effect and the machining efficiency, and meanwhile, the gap current is ensured to be continuous.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a switched capacitor type pulse power supply for electric spark machining, which can output high voltage in a breakdown delay stage and lower voltage in an electric discharge machining stage, can meet the electric spark machining requirements of large discharge current and small discharge current ripple, can solve the problems of complex topology of a high-low voltage composite structure and output capacitance of a single-stage type pulse power supply, and has the advantages of no right half plane zero point, simple control circuit, quick dynamic response, equal inductance current to load current, high machining efficiency, small stress of a switching tube and the like.
The invention provides a switched capacitor type pulse power supply for electric spark machining, which comprises the following components: the switching capacitor type step-up and step-down circuit comprises a switching capacitor type step-up and step-down circuit, a direct current voltage source, an FPGA control circuit and a driving circuit, wherein the switching capacitor type step-up and step-down circuit is used for carrying out gap breakdown and machining discharge in electric spark machining, the direct current voltage source is used for outputting direct current voltage to supply power for the switching capacitor type step-up and step-down circuit, the FPGA control circuit is used for providing control signals for the driving circuit, and the driving circuit is used for controlling the on and off of a switching tube in the switching capacitor type step-up and step-down circuit after amplifying the control signals output by the FPGA.
Preferably, the switching capacitor type buck-boost circuit comprises the following main components: DC voltage source (V) in ) First switch tube (Q) 1 ) Second switch tube (Q) 2 ) Third switch tube (Q) 3 ) Fourth switch tube (Q) 4 ) First diode (D) 1 ) A first capacitor (C 1 ) First inductor (L) 1 ) Spark gap (V) d ) The dc voltage source (V in ) And the first diode (D) 1 ) Is connected to the left end of the first diode (D 1 ) Right end of (d) and a third switching tube (Q) 3 ) Is connected with the drain electrode of the third switch tube (Q 3 ) Source of (c) and first inductor (L) 1 ) Is connected to the left end of the first inductor (L 1 ) Right end of (d) and spark gap (V d ) Is connected to the positive electrode of the spark gap (V d ) Is connected with a DC voltage source (V) in ) Is connected with the negative electrode of the first switch tube (Q 1 ) Is connected with a DC voltage source (V) in ) And a first diode (D) 1 ) Is connected to the left end of the first switching tube (Q 1 ) Source and second switch tube (Q) 2 ) Is connected with the drain electrode of the second switch tube (Q 2 ) Source-to-spark gap (V) d ) Is connected with a negative electrode of a DC voltage source (V in ) Is connected to the connection point of the negative electrode of the first capacitor (C 1 ) And the first diode (D) 1 ) Right end of (d) and third switching tube (Q) 3 ) Is connected to the junction of the drains of the first capacitor (C 1 ) Is connected with the negative pole of the first switch tube (Q) 1 ) Source of (c) and second switching tube (Q) 2 ) Is connected to the junction of the drain electrode of the fourth switching tube (Q 4 ) And a third switch tube (Q) 3 ) And a first inductance (L) 1 ) Is connected to the left end of the fourth switching tube (Q 4 ) Source of (C) and first switch tube (Q) 1 ) Source of (c) and second switching tube (Q) 2 ) Is connected to the connection point of the drain electrode.
Preferably, the first switching tube (Q 1 ) Second switch tube (Q) 2 ) Third switch tube (Q) 3 ) Fourth switch tube (Q) 4 ) Selecting MOSFET of type IPW60R037P7 of Infineon company, first diode (D 1 ) A diode of the type CI30S65D3L2, manufactured by Tokmas company, is selected, a first inductor (L 1 ) A flat copper wire inductor is selected.
Preferably, a single cycle of electrical discharge machining comprises the steps of:
step S1: in the breakdown delay stage, the gap is not broken down, the gap presents an open circuit state, the switched capacitor type pulse power supply works in a boost mode, the boost mode is divided into two working modes, in the first working mode, the FPGA control circuit generates a control signal, and after passing through the driving circuit, the first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn on, fourth switching tube (Q) 4 ) Turn off, direct current voltage source (V in ) A first capacitor (C 1 ) The voltage at both ends is charged to V in The method comprises the steps of carrying out a first treatment on the surface of the In the second mode of operation, the FPGA control circuit generates a control signal which, after passing through the drive circuit, controls the first switching tube (Q 1 ) On, second switching tube (Q) 2 ) Turn-off, third switch tube (Q 3 ) Turn on, fourth switching tube (Q) 4 ) Turn off, the first capacitor (C 1 ) Equivalent to a voltage V in Is a direct current voltage source (V) in ) With a first capacitor (C 1 ) StringCoupled gap output 2V in Is waiting for the gap to break down;
step S2: after the gap is broken down, the gap enters an electric discharge machining stage, the gap characteristic is a quasi-maintaining voltage source, the switched capacitor type pulse power supply works in a step-down mode, the step-down mode is divided into two working modes, in the first working mode, an FPGA control circuit generates a control signal, and after passing through a driving circuit, a first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn on, fourth switching tube (Q) 4 ) Turn off, the gap current rises rapidly; when the current value rises to the current reference value set by the FPGA, the switched capacitor pulse power supply works in a second working mode, the FPGA control circuit generates a control signal, and after passing through the driving circuit, the control signal controls the first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn-off, fourth switching tube (Q) 4 ) On, gap current passing through a second switching tube (Q 2 ) And fourth switching tube (Q) 4 ) Freewheeling; repeating the two working modes, and performing electric discharge machining on the electric spark gap;
step S3: after the discharge machining stage is finished, the electric discharge machining stage enters a deionization stage, an FPGA control circuit generates a control signal, and after the control signal passes through a driving circuit, a first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn-off, fourth switching tube (Q) 4 ) Conduction, first inductance (L 1 ) The medium energy is released to the gap to perform deionization, and after the energy is exhausted, the gap recovers the insulation characteristic, and the voltage at the two ends of the gap is zero;
step S4: repeating the steps S1 to S3, and entering the next processing period.
Compared with the prior art, the technical scheme has the following beneficial effects:
1. the invention provides a switched capacitor type pulse power supply for electric spark machining, which can solve the problems of complex topology of a high-low voltage composite structure and output capacitance of a single-stage type pulse power supply.
2. The switch capacitor type pulse power supply for electric spark machining can meet the requirements of the electric spark machining pulse power supply for voltage rising and falling, high-voltage breakdown gaps are output in the breakdown delay stage, low-voltage is output in the electric discharge machining stage for electric discharge machining, the topology is simpler, and the requirements for the electric spark machining pulse power supply are met efficiently and reliably.
3. The switch capacitor type pulse power supply for electric spark machining provided by the invention has no right half plane zero point, and is simple in control circuit and quick in dynamic response.
4. The switch capacitor type pulse power supply for electric spark machining provided by the invention has the advantages that the inductance current is equal to the load current, the machining efficiency is high, and the stress of a switch tube is small.
5. The control circuit of the switched capacitor type pulse power supply for electric spark machining provided by the invention is programmed by the FPGA, so that the requirements of different machining scenes are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a switched capacitor pulse power frame for electrical discharge machining in accordance with the present invention;
FIG. 2 is a schematic diagram of a switched capacitor pulsed power supply topology for electrical discharge machining in accordance with the present invention;
fig. 3 to 5 are views of working modes of a switched capacitor type pulse power supply for electric discharge machining according to the present invention;
FIG. 6 is a schematic diagram of an application of a driving chip used in the present invention;
fig. 7 is a schematic diagram of a switched capacitor type pulse power supply discharge machining waveform for electric discharge machining according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-7, the invention relates to a switched capacitor type pulse power supply for electric spark machining, which comprises a switched capacitor type buck-boost circuit, a direct current voltage source, an FPGA control circuit and a driving circuit, wherein the switched capacitor type buck-boost circuit is used for gap breakdown and machining discharge of electric spark machining, the direct current voltage source is used for outputting direct current voltage to supply power for the switched capacitor type buck-boost circuit, the FPGA control circuit is used for providing control signals for the driving circuit, and the driving circuit is used for amplifying the control signals output by the FPGA and controlling the on and off of a switching tube in the switched capacitor type buck-boost circuit.
The switching capacitance type buck-boost circuit comprises the following components: DC voltage source (V) in ) First switch tube (Q) 1 ) Second switch tube (Q) 2 ) Third switch tube (Q) 3 ) Fourth switch tube (Q) 4 ) First diode (D) 1 ) A first capacitor (C 1 ) First inductor (L) 1 ) Spark gap (V) d ) DC voltage source (V in ) And the first diode (D) 1 ) Is connected to the left end of the first diode (D 1 ) Right end of (d) and a third switching tube (Q) 3 ) Is connected with the drain electrode of the third switch tube (Q 3 ) Source of (c) and first inductor (L) 1 ) Is connected to the left end of the first inductor (L 1 ) Right end of (d) and spark gap (V d ) Is connected to the positive electrode of the spark gap (V d ) Is connected with a DC voltage source (V) in ) Is connected with the negative electrode of the first switch tube (Q 1 ) Is connected with a DC voltage source (V) in ) And a first diode (D) 1 ) Is connected to the left end of the first switching tube (Q 1 ) Source and second switch tube (Q) 2 ) The drain electrode of the second switch tube is connected with(Q 2 ) Source-to-spark gap (V) d ) Is connected with a negative electrode of a DC voltage source (V in ) Is connected to the connection point of the negative electrode of the first capacitor (C 1 ) And the first diode (D) 1 ) Right end of (d) and third switching tube (Q) 3 ) Is connected to the junction of the drains of the first capacitor (C 1 ) Is connected with the negative pole of the first switch tube (Q) 1 ) Source of (c) and second switching tube (Q) 2 ) Is connected to the junction of the drain electrode of the fourth switching tube (Q 4 ) And a third switch tube (Q) 3 ) And a first inductance (L) 1 ) Is connected to the left end of the fourth switching tube (Q 4 ) Source of (C) and first switch tube (Q) 1 ) Source of (c) and second switching tube (Q) 2 ) Is connected to the connection point of the drain electrode.
As a specific example, the switch tube in the circuit topology is selected from a MOSFET with the model of IPW60R037P7 of Infineon company, the diode is selected from a diode with the model of CI30S65D3L2 of Tokmas company, the inductor is selected from a flat copper wire inductor, and the switch capacitor type pulse power supply for electric spark machining can be controlled by an FPGA (i.e. field programmable gate array), the invention is selected from a cycloniev series chip EP4CE6F17C8 of ALTERA company, the drive circuit can select a drive chip with high-low end two-way drive and isolation characteristics, and the invention is selected from a drive chip with the model of UCC21521 of texas instruments (texas electronics) as shown in fig. 6.
First switch tube (Q) of switch capacitance type step-up and step-down circuit 1 ) Turn-off, second switch tube (Q) 2 ) Conduction, third switch tube (Q) 3 ) Switch-on and fourth switch tube (Q) 4 ) The working state in turn-off is shown in fig. 3; first switch tube (Q) of switch capacitance type step-up and step-down circuit 1 ) Conduction, second switch tube (Q) 2 ) Turn-off, third switch tube (Q) 3 ) Switch-on and fourth switch tube (Q) 4 ) The working state at the time of turn-off is shown in fig. 4; first switch tube (Q) of switch capacitance type step-up and step-down circuit 1 ) Turn-off, second switch tube (Q) 2 ) Conduction, third switch tube (Q) 3 ) Switch-off and fourth switch tube (Q) 4 ) The working state in conduction is shown in FIG. 5；
As shown in fig. 3 to 5, for the overall processing of the working mode diagram of the switched capacitor pulse power supply for electric discharge machining according to the present invention, the electric discharge machining is divided into three stages: breakdown delay (boost mode corresponds to fig. 3, 4); electric discharge machining (buck mode corresponds to fig. 4, 5); the deionization stage (fig. 5), three stages are a complete process, and a single cycle of electrical discharge machining includes the steps of:
step S1: in the breakdown delay stage, the gap is not broken down, the gap presents an open circuit state, the switched capacitor type pulse power supply works in a boost mode, the boost mode is divided into two working modes, in the first working mode, the FPGA control circuit generates a control signal, and after passing through the driving circuit, the first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn on, fourth switching tube (Q) 4 ) Turn off, direct current voltage source (V in ) A first capacitor (C 1 ) The voltage at both ends is charged to V in As shown in fig. 3; in the second mode of operation, the FPGA control circuit generates a control signal which, after passing through the drive circuit, controls the first switching tube (Q 1 ) On, second switching tube (Q) 2 ) Turn-off, third switch tube (Q 3 ) Turn on, fourth switching tube (Q) 4 ) Turn off, the first capacitor (C 1 ) Equivalent to a voltage V in Is a direct current voltage source (V) in ) With a first capacitor (C 1 ) Series gap output 2V in As shown in fig. 4, waiting for the gap to break down;
step S2: after the gap is broken down, the gap enters an electric discharge machining stage, the gap characteristic is a quasi-maintaining voltage source, the switched capacitor type pulse power supply works in a step-down mode, the step-down mode is divided into two working modes, in the first working mode, an FPGA control circuit generates a control signal, and after passing through a driving circuit, a first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn on, fourth switching tube (Q) 4 ) Turn off, the gap current rises rapidly as shown in fig. 3; when the current value rises to the current reference value set by the FPGAThe switch capacitor type pulse power supply works in a second working mode, the FPGA control circuit generates a control signal, and after the control signal passes through the driving circuit, the first switch tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn-off, fourth switching tube (Q) 4 ) On, gap current passing through a second switching tube (Q 2 ) And fourth switching tube (Q) 4 ) Freewheel, as shown in FIG. 5; repeating the two working modes, and performing electric discharge machining on the electric spark gap;
step S3: after the discharge machining stage is finished, the electric discharge machining stage enters a deionization stage, an FPGA control circuit generates a control signal, and after the control signal passes through a driving circuit, a first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn-off, fourth switching tube (Q) 4 ) Conduction, first inductance (L 1 ) The medium energy is released to the gap to perform deionization, and after the energy is exhausted, the gap recovers the insulation characteristic, and the voltage at the two ends of the gap is zero;
step S4: repeating the steps S1 to S3, and entering the next processing period.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. The utility model provides a switch capacitance formula pulse power supply for spark-erosion machining, its characterized in that includes switch capacitance formula buck-boost circuit, direct current voltage source, FPGA control circuit, drive circuit, switch capacitance formula buck-boost circuit is used for spark-erosion machining's clearance breakdown and processing discharge, direct current voltage source is used for exporting direct current voltage and supplies power for switch capacitance formula buck-boost circuit, FPGA control circuit is used for providing control signal for drive circuit, drive circuit is arranged in controlling switching tube's switch in switch capacitance formula buck-boost circuit and turn-off after amplifying the control signal that the FPGA output.
2. The switched capacitor pulse power supply for electric discharge machining according to claim 1, wherein the switched capacitor step-up and step-down circuit comprises: DC voltage source (V) in ) First switch tube (Q) 1 ) Second switch tube (Q) 2 ) Third switch tube (Q) 3 ) Fourth switch tube (Q) 4 ) First diode (D) 1 ) A first capacitor (C 1 ) First inductor (L) 1 ) Spark gap (V) d ) The dc voltage source (V in ) And the first diode (D) 1 ) Is connected to the left end of the first diode (D 1 ) Right end of (d) and a third switching tube (Q) 3 ) Is connected with the drain electrode of the third switch tube (Q 3 ) Source of (c) and first inductor (L) 1 ) Is connected to the left end of the first inductor (L 1 ) Right end of (d) and spark gap (V d ) Is connected to the positive electrode of the spark gap (V d ) Is connected with a DC voltage source (V) in ) Is connected with the negative electrode of the first switch tube (Q 1 ) Is connected with a DC voltage source (V) in ) And a first diode (D) 1 ) Is connected to the left end of the first switching tube (Q 1 ) Source and second switch tube (Q) 2 ) Is connected with the drain electrode of the second switch tube (Q 2 ) Source-to-spark gap (V) d ) Is connected with a negative electrode of a DC voltage source (V in ) Is connected to the connection point of the negative electrode of the first capacitor (C 1 ) And the first diode (D) 1 ) Right end of (d) and third switching tube (Q) 3 ) Is connected to the junction of the drains of the first capacitor (C 1 ) Is connected with the negative pole of the first switch tube (Q) 1 ) Source of (c) and second switching tube (Q) 2 ) Is connected to the junction of the drain electrode of the fourth switching tube (Q 4 ) And a third switch tube (Q) 3 ) And a first inductance (L) 1 ) Is connected to the left end of the fourth switching tube (Q 4 ) Source of (C) and first switch tube (Q) 1 ) Source of (c) and second switching tube (Q) 2 ) Is connected to the connection point of the drain electrode.
3. A switched-capacitor pulsed power supply for electrical discharge machining according to claim 2, characterized in that the first switching tube (Q 1 ) Second switch tube (Q) 2 ) Third switch tube (Q) 3 ) Fourth switch tube (Q) 4 ) Is of the type IPW60R037P7, a first diode (D 1 ) Is a diode of the type CI30S65D3L2, a first inductance (L 1 ) A flat copper wire inductor is selected.
4. The switched capacitor pulse power supply for electrical discharge machining according to claim 1, wherein said FPGA control circuit is a cycloniv series chip EP4CE6F17C8.
5. The switched capacitor pulse power supply for electrical discharge machining of claim 1 wherein said driver circuit is a type UCC21521 driver chip.
6. A switched capacitor pulse power supply for electric discharge machining according to any one of claims 1-5, characterized in that a single cycle of electric discharge machining comprises the steps of:
step S1: in the breakdown delay stage, the gap is not broken down, the gap presents an open circuit state, the switched capacitor type pulse power supply works in a boost mode, the boost mode is divided into two working modes, in the first working mode, the FPGA control circuit generates a control signal, and after passing through the driving circuit, the first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn on, fourth switching tube (Q) 4 ) Turn off, direct current voltage source (V in ) A first capacitor (C 1 ) The voltage at both ends is charged to V in The method comprises the steps of carrying out a first treatment on the surface of the In the second mode of operation, the FPGA control circuit generates a control signal which, after passing through the drive circuit, controls the first switching tube (Q 1 ) On, second switching tube (Q) 2 ) Turn-off, third switch tube (Q 3 ) Turn on, fourth switching tube (Q) 4 ) Turn off, the first capacitor (C 1 ) Equivalent to a voltage V in Is a direct current voltage source (V) in ) With a first capacitor (C 1 ) Series gap output 2V in Is waiting for the gap to break down;
step S2: after the gap is broken down, the gap enters an electric discharge machining stage, the gap characteristic is a quasi-maintaining voltage source, the switched capacitor type pulse power supply works in a step-down mode, the step-down mode is divided into two working modes, in the first working mode, an FPGA control circuit generates a control signal, and after passing through a driving circuit, a first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn on, fourth switching tube (Q) 4 ) Turn off, the gap current rises rapidly; when the current value rises to the current reference value set by the FPGA, the switched capacitor pulse power supply works in a second working mode, the FPGA control circuit generates a control signal, and after passing through the driving circuit, the control signal controls the first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn-off, fourth switching tube (Q) 4 ) On, gap current passing through a second switching tube (Q 2 ) And fourth switching tube (Q) 4 ) Freewheeling; repeating the two working modes, and performing electric discharge machining on the electric spark gap;
step S3: after the discharge machining stage is finished, the electric discharge machining stage enters a deionization stage, an FPGA control circuit generates a control signal, and after the control signal passes through a driving circuit, a first switching tube (Q 1 ) Turn off, the second switch tube (Q 2 ) On, third switch tube (Q) 3 ) Turn-off, fourth switching tube (Q) 4 ) Conduction, first inductance (L 1 ) The medium energy is released to the gap to perform deionization, and after the energy is exhausted, the gap recovers the insulation characteristic, and the voltage at the two ends of the gap is zero;
step S4: repeating the steps S1 to S3, and entering the next processing period.
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Cited By (1)
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| CN117792141A (en) * | 2024-02-24 | 2024-03-29 | 厦门理工学院 | High-speed pulse circuit for capacitive and inductive loads |
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