CN111293921A - Adjustable RC (resistor-capacitor) micro pulse power supply based on three-way capacitor staggered discharge - Google Patents
Adjustable RC (resistor-capacitor) micro pulse power supply based on three-way capacitor staggered discharge Download PDFInfo
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- CN111293921A CN111293921A CN201911388730.2A CN201911388730A CN111293921A CN 111293921 A CN111293921 A CN 111293921A CN 201911388730 A CN201911388730 A CN 201911388730A CN 111293921 A CN111293921 A CN 111293921A
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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
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- 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
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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
- 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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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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
- 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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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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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- 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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
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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)
- Inverter Devices (AREA)
Abstract
The invention discloses an adjustable RC (resistance-capacitance) micro pulse power supply based on three-way capacitor staggered discharge, which comprises a main power loop, a driving circuit, an auxiliary power supply, a direct-current voltage source and an FPGA (field programmable gate array) controller, wherein the main power loop is used for providing breakdown voltage and discharge energy after breakdown for a gap; the direct current voltage source provides voltage for the main power loop; the auxiliary power supply provides voltage for the driving circuit; the FPGA controller is used for outputting a PWM control signal to the drive circuit; the driving circuit carries out digital isolation and amplification on the PWM control signal to generate a driving signal to drive the switch tube in the main power loop to be switched on and switched off; the main power loop adopts an RC type circuit with adjustable input resistance and three circuits of capacitors connected in parallel in a staggered mode as a topology. The invention improves the working efficiency and the flexibility of the power supply and shortens the charging time.
Description
Technical Field
The invention relates to a high-frequency micro electric spark machining technology, in particular to an adjustable RC (resistance capacitance) micro pulse power supply based on three-way capacitor staggered discharge.
Background
The pulse power supply, which is a core part of the electric discharge machine, has important influences on the roughness of a machined surface, the damage degree of a tool electrode, the machining precision, the machining efficiency and the electric energy utilization rate. Therefore, the processing quality puts high demands on the energy level and the processing efficiency of the pulse power supply. At present, in the field of micro electric spark machining, a pulse power supply mainly adopts a relaxation type or independent topological structure, the relaxation type pulse power supply is simple in structure and low in single discharge energy, but is low in discharge frequency and low in machining efficiency, and in addition, the relaxation type pulse power supply needs to be provided with a direct-current voltage source with a certain high voltage. The independent pulse power supply has high discharge frequency and controllable discharge pulse width, but has high power and damping loss, and is not suitable for micro machining.
Disclosure of Invention
The invention aims to provide an adjustable RC (resistance capacitance) micro pulse power supply based on three-way capacitor staggered discharge, so that energy controllability and continuous high-frequency discharge of the power supply are realized.
The technical solution for realizing the purpose of the invention is as follows: an adjustable RC (resistor-capacitor) micro pulse power supply based on three-way capacitor staggered discharge comprises a main power loop, a driving circuit, an auxiliary power supply, a direct-current voltage source and an FPGA (field programmable gate array) controller, wherein the main power loop is used for providing breakdown voltage and discharge energy after breakdown for a gap; the direct current voltage source provides voltage for the main power loop; the auxiliary power supply provides voltage for the driving circuit; the FPGA controller is used for outputting a PWM control signal to the drive circuit; the driving circuit carries out digital isolation and amplification on the PWM control signal to generate a driving signal to drive the switch tube in the main power loop to be switched on and switched off; the main power loop adopts an RC type circuit with adjustable input resistance and three circuits of capacitors connected in parallel in a staggered mode as a topology, and comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a first inductor, an input capacitor, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a first resistor and a second resistor, wherein the seventh switch tube and the eighth switch tube are connected with the input capacitor, the other ends of the first resistor and the second resistor are respectively connected with the first resistor and the second resistor, the other ends of the first resistor and the second resistor are connected with the fourth switch tube, the other end of the fourth switch tube is connected with the first inductor, the other end of the first inductor is connected with the anode of the first diode, the first switch tube, the second switch tube and the third switch tube are respectively connected with the first capacitor, the second capacitor and the third capacitor, the other end of the first diode is connected with the cathode of the first diode, the fifth switch tube is connected with the connection point of the cathode of the first diode and the first switch tube, the other end of the fifth switch tube is connected with the anode of the second diode, the cathode of the second diode is connected with the connection points of the input capacitor, the first capacitor, the second capacitor and the third capacitor, namely is connected with the gap grounding point, the sixth switch tube is connected with the cathode of the second diode, and the other end of the sixth switch tube is connected with the connection points of the input capacitor, the first capacitor, the second capacitor and the third capacitor, namely is connected with the gap grounding point.
The model that first switch tube, second switch tube, third switch tube chose ON Semiconductor company is FCP165N65S3 'S N channel MOSFET for use, the model that fourth switch tube, fifth switch tube, sixth switch tube, seventh switch tube, eighth switch tube chose infineon company is IPP60R74C 6' S N channel MOSFET for use.
The first inductor is made of MPH201206S1R0MT made by Sunlord corporation.
The FPGA controller is in the model number of EP4CE15F23C 8.
The drive circuit selects a drive chip UCC 21521.
A gap machining method based on the adjustable RC micro pulse power supply based on three-way capacitor staggered discharge comprises the following steps:
the method comprises the following steps: before the gap is not broken down, a corresponding multi-channel PWM signal is generated by an FPGA controller, after the multi-channel PWM signal is amplified by a driving circuit, a first switch tube, a second switch tube, a third switch tube and a fourth switch tube are controlled to be completely switched on, a fifth switch tube and a sixth switch tube are controlled to be completely switched off, the on-off of a seventh switch tube and an eighth switch tube is controlled according to production requirements to adjust the resistance value of a current-limiting resistor in a power loop, at the moment, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the seventh switch tube and/or the eighth switch tube form a charging part of an RC circuit, a direct-current voltage source charges three discharging capacitors, namely the first capacitor, the second capacitor and the third capacitor, the first inductor generates an induced potential to further raise the charging voltage, the raised potential is clamped by the first diode, and the charging speed is accelerated;
step two: when the voltage at the two ends of the gap reaches the breakdown voltage, the gap is broken down, a discharge channel is formed between the electrode and the workpiece, corresponding multi-channel PWM signals are generated by the FPGA controller during gap discharge, the fourth switch tube and the sixth switch tube are controlled to be turned off after the signals are amplified by the driving circuit, the discharge loop part of the RC circuit is formed by the first switch tube, the second switch tube, the third switch tube and the fifth switch tube, the three discharge capacitors, namely the first capacitor, the second capacitor and the third capacitor, are connected in parallel in a staggered mode, forward machining current is provided for gap load through the second diode, the gap is subjected to continuous high-frequency micro-energy discharge, and the workpiece is precisely machined;
step three: after the discharge is finished, the gap enters a deionization stage, after the single discharge is finished and before the next discharge period starts, the FPGA controller generates a corresponding PWM signal, after the PWM signal is amplified by the driving circuit, the switching tubes are controlled to be connected, other switching tubes are all switched off, the voltage at the two ends of the gap is zero, and the gap enters the deionization stage of the circuit to prepare for the discharge of the next period;
step four: and repeating the three steps to realize the cycle of the processing period.
Compared with the prior art, the invention has the following remarkable advantages: 1) the micro-pulse power supply has simple structure, high efficiency and energy conservation, and very small discharge energy to meet the micro-machining energy requirement; 2) the power topology adopts the RC type circuit with three paths of charging capacitors connected in parallel in a staggered mode, and compared with the traditional pulse power supply, the power topology can realize three times of discharging frequency and improve the working efficiency of the power supply; 3) the charging circuit adopts the combination of two resistors, the resistance value of the charging resistor can be flexibly adjusted and changed through a switching tube, so that parameters such as the resistance value of a current-limiting resistor, the charging time and the like can be adjusted at will, and the flexibility of the power supply is improved; 4) the charging loop is provided with a combination of an inductor and a diode which are connected in series, and the diode plays a clamping role to realize the lifting of charging voltage, shorten the charging time and further improve the switching frequency.
Drawings
Fig. 1 is a block diagram of an architecture of an adjustable RC micro pulse power supply based on three-way capacitor interleaving discharge according to the present invention.
Fig. 2 is a circuit diagram of the main power loop of the present invention.
Fig. 3 is a schematic diagram of a driving chip selected by the driving circuit of the present invention.
Fig. 4 is a schematic diagram of a discharge waveform of the adjustable RC micro pulse power supply based on three-way capacitor interleaving discharge according to the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
As shown in fig. 1, the adjustable RC micro pulse power supply based on three-way capacitor interleaving discharge includes a main power loop, a driving circuit, an auxiliary power supply, a dc voltage source, and an FPGA controller. The main power loop is used for providing breakdown voltage and discharge energy after breakdown for the gap; the direct current voltage source provides voltage for the main power loop; the auxiliary power supply provides voltage for the driving circuit; the FPGA controller is used for outputting a PWM control signal to the drive circuit according to a given target parameter; the driving circuit carries out digital isolation and amplification on the PWM control signal to generate a driving signal to drive the switch tube in the main power loop to be switched on and switched off.
As shown in fig. 2, the main power loop may employ an input resistorThe RC type circuit with three capacitors connected in parallel alternately is a topology and comprises a first switch tubeQ 1A second switch tubeQ 2The third switch tubeQ 3And the fourth switch tubeQ 4The fifth switch tubeQ 5The sixth switching tubeQ 6Seventh switch tubeQ 7The eighth switch tubeQ 8A first inductorL 1Input capacitorC inA first capacitorC 1A second capacitorC 2A third capacitorC 3A first diodeD 1A second diodeD 2A first resistorR 1Second resistanceR 2Wherein, the seventh switch tubeQ 7The eighth switch tubeQ 8And an input capacitanceC inConnected with the other end of the first resistor respectivelyR 1A second resistorR 2Connected to a first resistorR 1A second resistorR 2The other end and a fourth switching tubeQ 4Connected, a fourth switching tubeQ 4The other end is connected with the first inductorL 1First inductanceL 1The other end and the first diodeD 1Is connected with the anode of the first switch tubeQ 1A second switch tubeQ 2The third switch tubeQ 3Are respectively connected with the first capacitorsC 1A second capacitorC 2A third capacitorC 3Connected with each other, and the other end is connected with a first diodeD 1Cathode of (1), fifth switching tubeQ 5And a first diodeD 1Cathode and first switch tubeQ 1Is connected with the other end of the first diode and the second diodeD 2Anode of (2), second diodeD 2Cathode and input capacitor ofC inAnd a first capacitorC 1A second capacitorC 2A third capacitorC 3Is connected with the gap grounding point, a sixth switching tubeQ 6And a second diodeD 2Is connected to the cathode and the other end is connected toInput capacitanceC inAnd a first capacitorC 1A second capacitorC 2A third capacitorC 3Is connected, i.e. to the gap ground.D 1The clamping function is realized, and the clamping function is realized,D 2the gap voltage oscillation can be prevented from generating the reverse current of the current. Second diodeD 2Cathode and sixth switching tubeQ 6Connected with the other end of the fifth switch tubeQ 5Connected, sixth switching tubeQ 6Are connected at both ends of the gap. The main power loop is divided into a charging loop and a discharging loop, the charging loop adopts two charging resistors which are connected in parallel, the change of the resistance value of the resistors is adjusted by switching on and off the switch, in addition, the induced electromotive force is generated by the inductor which is connected in series in the charging loop, the charging voltage is further increased, and the charging time is shortened so as to improve the processing frequency; the discharge loop adopts the combination of three circuits of capacitors which are connected in a staggered and parallel manner, and realizes the high-frequency charging and discharging process through the time sequence control of the switch tube, thereby enabling the gap to be broken down for discharging, and after the single discharge is finished, the switch tubeQ 6And conducting, pulling the voltage at the two ends of the gap to 0V, and enabling the gap to enter a deionization stage to prepare for breakdown in the next period.
In the main power circuit, the switch tubeQ 1、Q 2、Q 3The N-channel MOSFET with the model number of FCP165N65S3 manufactured by ON Semiconductor company is selected and used, and the drain-source electrode of the N-channel MOSFET has withstand voltageV DSUp to 650V, rated currentI DIs 19A, a switch tubeQ 4、Q 5、Q 6、Q 7、Q 8The N-channel MOSFET with model number IPP60R74C6 manufactured by infineon company is selected and has a drain-source voltage resistanceV DSRated current up to 600VI D57.7A, the working frequency is up to 1MHz, and the high-frequency high-voltage micro-electro-discharge machining device can be used in high-frequency, high-voltage and low-current micro-electro-discharge machining. The first inductor is selected from Sunlord company with model number MPH201206S1R0MT and inductance value of 1μH, the diode is selected to be FFP30S60S, has the reverse withstand voltage of 600V and conducts current 30A continuously in the forward direction.
And signals for controlling the on-off of the MOS tube in the power loop are generated by the FPGA controller. The FPGA selects the model number EP4CE15F23C8 as a high-speed processor of the cycle IV series of Altera company, the clock frequency of the high-speed processor reaches 472MHz, and two paths of high-speed and high-precision AD conversion chips are arranged for inputting sampling signals.
Considering that the FPGA is not enough to drive the on-off of the switch tube and the mutual influence between the power circuit and the weak current circuit, an isolated driving circuit is needed between the FPGA and the power circuit and is used for amplifying a control signal sent by the FPGA and outputting a driving signal with a certain voltage amplitude value meeting the driving capability.
As shown in fig. 3, the driving circuit of the present invention uses a high-low end driving chip with isolation, and here, a gate driving IC chip with a model number of UCC21521, which is introduced by texas instruments, receives the PWM output signal of the FPGA, amplifies the PWM output signal by the driving chip, and drives the switching tube in the power circuit. The grid driving chip is a dual-channel, high-speed, internally isolated and grid driving chip with an enabling pin, the bandwidth is up to 5 MHz, the isolation voltage is up to 5.7 kV, and the surge anti-interference voltage is 12.8 kV. The driving chip can generate high-end and low-end driving at the same time, and the primary side and the secondary side are isolated, so that the interference between a main circuit and a control circuit is reduced.
The adjustable RC micro pulse power supply based on three-way capacitor staggered discharge adopts the RC circuit with the power inductor for boosting voltage and the three-way charging capacitor in staggered parallel connection, and a diode is connected in series at the output side of the power supply, so that the current reverse flow caused by gap voltage oscillation can be prevented. The pulse power supply has the advantages of simple structure, energy storage by a capacitor, no resistance, high efficiency and energy saving, and compared with the traditional power supply, the pulse power supply has the advantages that the discharge frequency is increased to three times, the voltage requirement on a direct-current voltage source is not high, and the control is flexible and reliable.
Fig. 4 is a schematic diagram of a gap voltage current waveform for a machining cycle including three breakdown discharge processes. At the beginning of the machining cycle, the gap output voltage is no-load voltage; after the charging capacitor is charged, when the voltage at two ends of the gap reaches the breakdown voltage, the gap breakdown occurs, the gap voltage is quickly reduced to the maintaining voltage, the gap current is also quickly increased, and three machining cycles are performed in a single machining cycleThe charging capacitors work in a staggered parallel connection mode to sequentially provide breakdown voltage for the gaps, so that tripling of the discharging frequency is achieved, and after discharging is finished, the gap current is reduced to 0. After one processing cycle is finished, the switch tubeQ 6Conducting and enabling the gap to enter a deionization stage. The gap processing method of the adjustable RC micro pulse power supply based on three-way capacitor staggered discharge comprises the following specific steps:
the method comprises the following steps: in the arc striking stage before the gap is not broken down, the FPGA controller generates corresponding multi-path PWM signals, and controls the first switch tube after the signals are amplified by the driving circuitQ 1A second switch tubeQ 2And a third switching tube Q3And the fourth switch tubeQ 4All are conducted to control the fifth switch tubeQ 5The sixth switching tubeQ 6All are switched off, and the seventh switching tube is controlled according to production requirementsQ 7The eighth switch tubeQ 8The resistance value of the current-limiting resistor in the power loop is adjusted by the on-off of the first switch tubeQ 1A second switch tubeQ 2And a third switching tube Q3And the fourth switch tubeQ 4And a seventh switching tubeQ 7And/or eighth switching tubeQ 8A DC voltage source constituting a charging part of the RC circuitV inFor three discharge capacitors, i.e. the first capacitorC 1A second capacitorC 2A third capacitorC 3Charging is carried out through the first inductorL 1Generating an induced potential to further raise the charging voltage, a first diodeD 1Clamping the raised potential to accelerate the charging speed;
step two: when the voltage at the two ends of the gap reaches the breakdown voltage, the gap breaks down, a discharge channel is formed between the electrode and the workpiece, and during the gap discharge, the FPGA controller generates corresponding multi-path PWM signals, and the multi-path PWM signals are amplified by the driving circuit to control the fourth switch tubeQ 4The sixth switching tubeQ 6Turn off, at the moment, by the first switch tubeQ 1A second switch tubeQ 2And a third switching tube Q3The fifth switch tubeQ 5Three discharge capacitors, i.e. the first capacitor, forming part of the discharge circuit of the RC circuitC 1A second capacitorC 2A third capacitorC 3Working in parallel alternately, via a second diodeD 2Providing positive processing current for the gap load, and continuously discharging high-frequency micro energy in the gap to realize the precise processing of the workpiece;
step three: after the discharge is finished, the gap enters a deionization stage, after the single discharge is finished and before the next discharge period begins, the FPGA controller generates a corresponding PWM signal, and controls the switch tube after the PWM signal is amplified by the driving circuitQ 6 Conducting, and turning off other switch tubes to make the voltage at two ends of the gap zero, and making the gap enter a deionization stage of the circuit to prepare for the next period of discharge;
step four: and repeating the three steps to realize the cycle of the processing period.
Claims (6)
1. An adjustable RC (resistance-capacitance) micro pulse power supply based on three-way capacitor staggered discharge is characterized by comprising a main power loop, a driving circuit, an auxiliary power supply, a direct-current voltage source and an FPGA (field programmable gate array) controller, wherein the main power loop is used for providing breakdown voltage and discharge energy after breakdown for a gap; the direct current voltage source provides voltage for the main power loop; the auxiliary power supply provides voltage for the driving circuit; the FPGA controller is used for outputting a PWM control signal to the drive circuit; the driving circuit carries out digital isolation and amplification on the PWM control signal to generate a driving signal to drive the switch tube in the main power loop to be switched on and switched off; the main power loop adopts an RC type circuit with adjustable input resistance and three circuits of capacitors connected in parallel in a staggered mode as a topology and comprises a first switching tube (a)Q 1) A second switch tube (Q 2) A third switch tube (a)Q 3) And a fourth switching tube (Q 4) A fifth switch tube (Q 5) A sixth switching tube (Q 6) A seventh switch tube (Q 7) An eighth switching tube (Q 8) A first inductor (L 1) Input capacitance (c)C in) First electricityVolume (A), (B)C 1) A second capacitor (C 2) A third capacitor (C 3) A first diode (D 1) A second diode (a)D 2) A first resistor (R 1) A second resistor (R 2) Wherein, a seventh switch tube (Q 7) An eighth switching tube (Q 8) And an input capacitance (C in) Connected to the other end of the first resistorR 1) A second resistor (R 2) Connected to a first resistor (R 1) A second resistor (R 2) The other end and a fourth switching tube (Q 4) Connection, fourth switching tube (Q 4) Another end is connected to the first inductorL 1) A first inductor (L 1) The other end and a first diode (D 1) Is connected with the anode of the first switching tubeQ 1) A second switch tube (Q 2) A third switch tube (a)Q 3) Are respectively connected with the first capacitor (C 1) A second capacitor (C 2) A third capacitor (C 3) Connected to one another, and the other end is connected to a first diode (D 1) The cathode of (1), the fifth switching tube: (Q 5) And a first diode (D 1) A cathode and a first switching tube (Q 1) Is connected with the other end of the first diode (a)D 2) Anode of (2), second diode(s) ((D 2) The cathode and the input capacitor (C in) And a first capacitor (C 1) A second capacitor (C 2) A third capacitor (C 3) Is connected to the gap ground point, a sixth switching tube (Q 6) And a second diode (D 2) Is connected with the cathode of the first electrode, and the other end is connected with an input capacitor (C in) And a first capacitor (C 1) A second capacitor (C 2) A third capacitor (C 3) Is connected, i.e. to the gap ground.
2. The adjustable RC micropulse power supply based on three-way capacitor interleaving discharge of claim 1, wherein said first switch tube (c: (b))Q 1) A second switch tube (Q 2) A third switch tube (a)Q 3) An N-channel MOSFET (model number of FCP165N65S 3) of ON Semiconductor is selected, and the fourth switching tube (a)Q 4) A fifth switch tube (Q 5) A sixth switching tube (Q 6) A seventh switch tube (Q 7) An eighth switching tube (Q 8) An N-channel MOSFET model IPP60R74C6 from infineon was chosen.
3. The adjustable RC micropulse power supply based on three-way capacitor interleave discharge of claim 1, wherein the first inductor(s) (c: (c))L 1) The model number of Sunlord company is MPH201206S1R0 MT.
4. The adjustable RC micro pulse power supply based on three-way capacitor interleaved discharge of claim 1, wherein the FPGA controller is selected from the model EP4CE15F23C 8.
5. The adjustable RC micropulse power supply based on three-way capacitor interleaving discharge of claim 1, wherein said driving circuit is a driving chip UCC 21521.
6. The gap machining method of the adjustable RC micro-pulse power supply based on the three-way capacitor interleaving discharge as claimed in any one of claims 1 to 5, characterized by comprising the following steps:
the method comprises the following steps: before the gap is not broken down (arc striking stage), the FPGA controller generates corresponding multi-path PWM signals, and controls the first switch tube after the signals are amplified by the driving circuitQ 1) A second switch tube (Q 2) And a third switching tube (Q)3) And the fourth switch tube（Q 4) All are conducted to control the fifth switch tube (Q 5) A sixth switching tube (Q 6) All are switched off, and a seventh switching tube is controlled according to production requirements (Q 7) An eighth switching tube (Q 8) The resistance value of the current-limiting resistor in the power loop is adjusted by the on-off of the first switch tube (c)Q 1) A second switch tube (Q 2) And a third switching tube (Q)3) And a fourth switching tube (Q 4) And a seventh switching tube (Q 7) And/or an eighth switching tube (Q 8) A DC voltage source (C) constituting a charging part of the RC circuitV in) For three discharge capacitors, i.e. the first capacitor (C 1) A second capacitor (C 2) A third capacitor (C 3) Charging is carried out, the first inductor (L 1) Generating an induced potential to further raise the charging voltage, a first diode(s) (ii)D 1) Clamping the raised potential to accelerate the charging speed;
step two: when the voltage at the two ends of the gap reaches the breakdown voltage, the gap breaks down, a discharge channel is formed between the electrode and the workpiece, and during the gap discharge, the FPGA controller generates corresponding multi-path PWM signals, and the signals are amplified by the driving circuit to control a fourth switching tube (a)Q 4) A sixth switching tube (Q 6) Is turned off and is controlled by a first switch tube (Q 1) A second switch tube (Q 2) And a third switching tube (Q)3) A fifth switch tube (Q 5) A discharge loop part forming an RC circuit, and three discharge capacitors (a first capacitor:C 1) A second capacitor (C 2) A third capacitor (C 3) Working in parallel alternately through a second diode (D 2) Providing positive processing current for the gap load, and continuously discharging high-frequency micro energy in the gap to realize the precise processing of the workpiece;
step three: after the discharge is finished, the gap enters a deionization stage, and after the single discharge is finished, before the next discharge period beginsThe FPGA controller generates corresponding PWM signals, and controls the switch tube after the PWM signals are amplified by the driving circuitQ 6 ) Conducting, and turning off other switch tubes to make the voltage at two ends of the gap zero, and making the gap enter a deionization stage of the circuit to prepare for the next period of discharge;
step four: and repeating the three steps to realize the cycle of the processing period.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112388079A (en) * | 2020-11-19 | 2021-02-23 | 西安理工大学 | Composite pulse working method of wire cut electrical discharge machining pulse power supply |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3485987A (en) * | 1962-11-01 | 1969-12-23 | Elox Inc | Machining power supply for electrical discharge machining |
| CN101579761A (en) * | 2009-05-07 | 2009-11-18 | 中国工程物理研究院机械制造工艺研究所 | Two-stage pulse width limited precision discharge machining pulse power supply |
| CN102114559A (en) * | 2010-01-05 | 2011-07-06 | 北京安德建奇数字设备有限公司 | Alternating polarity pulsed power supply |
| CN102909444A (en) * | 2012-10-16 | 2013-02-06 | 中国石油大学(华东) | Pulsed power supply with parallel high-energy capacitors for electrosparking |
| CN103056461A (en) * | 2012-12-26 | 2013-04-24 | 扬州博尔特电气技术有限公司 | High-frequency impulse power supply of electric spark texturing system |
| US20130126482A1 (en) * | 2011-11-21 | 2013-05-23 | Daihen Corporation | Power supply device and arc machining power supply device |
| CN104617809A (en) * | 2015-02-16 | 2015-05-13 | 哈尔滨工业大学 | Main pulse power supply of light source for detecting discharging of Xe medium capillary |
| CN108336923A (en) * | 2018-04-13 | 2018-07-27 | 武汉华中华昌能源电气科技有限公司 | A kind of impulse circuit and the Square wave pulses source with the impulse circuit |
| CN108380988A (en) * | 2018-01-30 | 2018-08-10 | 南京理工大学 | A kind of WEDM pulse power supply and its control method |
| CN108471255A (en) * | 2018-03-27 | 2018-08-31 | 上海理工大学 | A kind of arbitrary polarity high-voltage square-wave superimposed pulses device |
-
2019
- 2019-12-30 CN CN201911388730.2A patent/CN111293921B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3485987A (en) * | 1962-11-01 | 1969-12-23 | Elox Inc | Machining power supply for electrical discharge machining |
| CN101579761A (en) * | 2009-05-07 | 2009-11-18 | 中国工程物理研究院机械制造工艺研究所 | Two-stage pulse width limited precision discharge machining pulse power supply |
| CN102114559A (en) * | 2010-01-05 | 2011-07-06 | 北京安德建奇数字设备有限公司 | Alternating polarity pulsed power supply |
| US20130126482A1 (en) * | 2011-11-21 | 2013-05-23 | Daihen Corporation | Power supply device and arc machining power supply device |
| CN102909444A (en) * | 2012-10-16 | 2013-02-06 | 中国石油大学(华东) | Pulsed power supply with parallel high-energy capacitors for electrosparking |
| CN103056461A (en) * | 2012-12-26 | 2013-04-24 | 扬州博尔特电气技术有限公司 | High-frequency impulse power supply of electric spark texturing system |
| CN104617809A (en) * | 2015-02-16 | 2015-05-13 | 哈尔滨工业大学 | Main pulse power supply of light source for detecting discharging of Xe medium capillary |
| CN108380988A (en) * | 2018-01-30 | 2018-08-10 | 南京理工大学 | A kind of WEDM pulse power supply and its control method |
| CN108471255A (en) * | 2018-03-27 | 2018-08-31 | 上海理工大学 | A kind of arbitrary polarity high-voltage square-wave superimposed pulses device |
| CN108336923A (en) * | 2018-04-13 | 2018-07-27 | 武汉华中华昌能源电气科技有限公司 | A kind of impulse circuit and the Square wave pulses source with the impulse circuit |
Non-Patent Citations (2)
| Title |
|---|
| MAN-HONG HU等: "DESIGN AND EXPERIMENTAL STUDY OF A MULTI-MODE CONTROLLABLE RC PULSE GENERATOR FOR MICRO-EDM", 《INTERNATIONAL CONFERENCE ON ADVANCED TECHNOLOGY OF DESIGN AND MANUFACTURE (ATDM 2010)》 * |
| 杨飞等: "放电能量实时控制的双极性电火花加工脉冲电源", 《电加工与模具》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112388079A (en) * | 2020-11-19 | 2021-02-23 | 西安理工大学 | Composite pulse working method of wire cut electrical discharge machining pulse power supply |
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