CN107276405B - The fine electric spark pulse power and Discrete control method based on the power supply - Google Patents
The fine electric spark pulse power and Discrete control method based on the power supply Download PDFInfo
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- CN107276405B CN107276405B CN201710387666.0A CN201710387666A CN107276405B CN 107276405 B CN107276405 B CN 107276405B CN 201710387666 A CN201710387666 A CN 201710387666A CN 107276405 B CN107276405 B CN 107276405B
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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
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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
Abstract
The present invention discloses a kind of fine electric spark pulse power, including power factor correcting converter, DC-DC converter, loop of power circuit, driving circuit, impulse generator, detection circuit, and wherein loop of power circuit includes 6 switching tube Qp、Q1、Q2、Q3、Q4、QoffWith 1 inductance Llimit, 4 switching tube Q1‑Q4It is connected with bridge architecture, switching tube QpConnect the outlet side of DC-DC converter and the input side of full-bridge converter, switching tube QoffAfter in parallel with gap, one end passes through inductance LlimitIt is connected to the midpoint of one of bridge arm, the other end is directly connected to the midpoint of another bridge arm.The invention also discloses the Discrete control methods based on the power supply.Power supply of the invention only includes a loop of power circuit, system constitutes simple, small in size, corresponding Discrete control method carries out the switching of voltage control and current control in a set of loop of power circuit, and voltage control and current control are independent mutually, switch and control precise and stable rapidly.
Description
Technical field
The invention belongs to electrical discharge machining pulsed-power industry, more particularly to a kind of fine electric spark pulse power and
Discrete control method based on the power supply.
Background technique
Continuous positive-negative polarity processing can improve the quality of processing, have certain effect in terms of the shaping of electric discharge pit
Fruit.In order to adapt to the requirement of a variety of processing occasions, processing conditions, electric spark working pulse power source must have positive-negative polarity processing
Ability.In order to realize that positive-negative polarity is processed, existing electric spark working pulse power source uses full-bridge converter as loop of power circuit
Main topology also needs one or more current-limiting resistances in loop of power circuit.Due to the presence of current-limiting resistance, so that the pulse power adds
Work is inefficient, is unable to satisfy requirement energy-efficient in micro EDM.
In addition, the striking stage needs the pulse power to apply in tool and piece pole both ends in edm process
High voltage, to achieve the purpose that quickly to puncture gap；And gap it is breakdown after discharge regime, then need the pulse power to provide steady
Fixed controllable processing electric current reaches satisfied processing effect to avoid overcurrent phenomenon, therefore micro EDM is to electric discharge
The Discrete control of voltage and current before and after gap breakdown requires very high.
Patent CN102114559B discloses a kind of alternating polarity pulses power supply, and loop of power circuit includes the first loop of power circuit
With the second loop of power circuit, Discrete control is carried out to voltage and current respectively, is discharging gap particular by the first loop of power circuit
Guide's breakdown voltage is provided, the discharge current control of discharge regime after gap breakdown is realized by the second loop of power circuit.It is this
Two sets of loop of power circuit of composite structured needs, structure is complicated, and there is also detection circuit and controller response speed, switching controls
The not arrogant problem of precision processed.
Summary of the invention:
Technical problem solved by the invention is to provide a kind of fine electric spark pulse power and point based on the power supply
Section control method can carry out Discrete control, and gap voltage to gap voltage and electric current in positive-negative polarity process
Control with electric current is independent mutually, switching rapidly, control effect it is precise and stable.
The technical solution for realizing the aim of the invention is as follows: a kind of fine electric spark pulse power, including power factor school
Direct transform device, DC-DC converter, loop of power circuit, driving circuit, impulse generator, detection circuit, alternating voltage pass through function
Rate factor correction converter and DC-DC converter export adjustable dc voltage and power to loop of power circuit, between loop of power circuit is given
Gap provides positive-negative polarity voltage, and the voltage and current of detection circuit detector gap is sent into impulse generator, impulse generator output
Signal is controlled, control signal generates the on-off of switching tube in driving signal driving power circuit, institute after overdrive circuit amplifies
Stating loop of power circuit includes 6 switching tube Qp、Q1、Q2、Q3、Q4、QoffWith 1 inductance Llimit, wherein 4 switching tube Q1-Q4With bridge-type
Structure is connected, switching tube QpConnect the outlet side of DC-DC converter and the input side of full-bridge converter, switching tube Qoff
After in parallel with gap, one end passes through inductance LlimitIt is connected to the midpoint of one of bridge arm, the other end is directly connected to other one
The midpoint of a bridge arm.
The control framework that the impulse generator uses DSP and FPFA to collectively form.
The power MOS pipe of switching tube selection tri- kinds of different materials of Si, SiC or GaN, is respectively applied in the loop of power circuit
Three kinds of roughing, semifinishing and microfabrication electrical discharge machining occasions.
Based on the processing method of the fine electric spark pulse power, include the following steps:
Step 1: in a positive polarity process, switching tube QpAnd Q4Remain conducting, Q2And QoffIt remains
Shutdown, switching tube Q1、Q3With inductance LlimitConstitute a Buck code converter, impulse generator control switch pipe Q1And Q3Alternately
On-off；In a negative polarity process, switching tube QpAnd Q3Remain conducting, Q1And QoffIt remains shutdown, switchs
Pipe Q2、Q4With inductance LlimitConstitute a Buck code converter, impulse generator control switch pipe Q2And Q4Alternately on-off；
Step 2: after the completion of process, disconnecting 4 switching tube Q1-Q4, then connect switching tube Qoff, accelerating gap deionization
Process.
If gap current overcurrent occurs in process, switching tube Q is disconnectedpTerminate processing.
Discrete control method based on the fine electric spark pulse power, includes the following steps:
Step 1: the setting process-cycle, voltage and current threshold value, realizing the Initialize installation of impulse generator；
Step 2: the analog signal of detection circuit real-time sampling gap voltage and electric current carries out AD by impulse generator and turns
After changing, the digital signal of gap voltage and electric current is obtained；
Step 3: when a process-cycle starts, impulse generator is according to gap voltage digital signal, gap current number
Word signal, voltage threshold and current threshold determine control strategy, if the digital signal of gap current is less than current threshold and voltage
Digital signal be greater than voltage threshold, then carry out voltage control；Otherwise it is switched to current control.
Compared with prior art, the present invention its remarkable advantage: 1) the fine electric spark pulse power of the invention, power return
Current-limiting resistance is replaced using current-limiting inductance in road, improves processing efficiency.2) the fine electric spark pulse power of the invention, arteries and veins
The framework that generator uses DSP+FPGA is rushed, the control of system had both been met and calculates requirement, is in turn ensured at multi signal logic
Reason ability and driving speed.3) processing method of the fine electric spark pulse power of the invention becomes full-bridge converter and Buck
Parallel operation combines, and can be realized in a loop of power circuit and divides in positive-negative polarity process gap voltage and electric current
Section control, simplifies circuit topology, reduces the volume of power-supply system, reduce influence of the parasitic parameter to processing.4) this hair
The Discrete control method of the novel fine electric spark pulse power of bright offer, voltage control and current control are feedback closed loop
Control, two kinds of controls are independent mutually, do not interfere with each other, and switch rapidly, are effectively guaranteed the accuracy of control.
Detailed description of the invention
Fig. 1 is the hardware block diagram of the fine electric spark pulse power.
Fig. 2 is the electrical block diagram of the power factor correcting converter of the fine electric spark pulse power.
Fig. 3 is the electrical block diagram of the DC-DC converter of the fine electric spark pulse power.
Fig. 4 is the structural schematic diagram of the loop of power circuit of the fine electric spark pulse power.
Fig. 5 is the structural schematic diagram of the driving circuit of the fine electric spark pulse power.
Fig. 6 is the structural schematic diagram of the detection circuit of the fine electric spark pulse power.
Fig. 7 is each stage schematic diagram in the fine electric spark pulse power process-cycle.
Fig. 8 is the flow chart of Discrete control.
Fig. 9 is voltage-controlled flow chart.
Figure 10 is the flow chart of current control.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
In order to reduce the interference between spark-erosion machine tool system components, the pulse power individually can take electricity from exchange input.
Traditional pulse power mostly uses low-frequency transformer and bridge rectifier to be powered on the mode held and rectifies, and the volume of power supply is larger and inputs
Power factor is low.For the influence for reducing the volume of power supply to reduce parasitic parameter to processing, and reduce Harmonics of Input
To improve input power factor and power-efficient, the fine electric spark pulse power provided by the invention uses level-one function in input side
Rate factor correction converter.
As shown in Figure 1, the fine electric spark pulse power, including power factor correcting converter, DC-DC converter,
Loop of power circuit, driving circuit, impulse generator, detection circuit, alternating voltage are straight by power factor correcting converter and direct current-
Current converter exports adjustable dc voltage and powers to loop of power circuit, and loop of power circuit provides positive-negative polarity voltage, detection electricity to gap
The voltage and current of road detector gap is sent into impulse generator, and impulse generator output control signal controls signal through overdriving
The on-off of switching tube in driving signal driving power circuit is generated after circuit amplification.As shown in Fig. 2, power number correcting converter is adopted
With crisscross parallel Boost power factor because of correcting converter, including a rectifier bridge and two-way Boost PFC electricity
Road, as inputting, feeding is single-phase not to control full bridge rectifier, the output feeding two-way crisscross parallel of rectification circuit to power grid alternating current
Boost circuit of power factor correction, the identical Boost circuit of power factor correction crisscross parallel work of two-way.Switching tube Qpfc1
And Qpfc2Drive signal duty cycle it is equal in magnitude, realize input and output electric current divide equally, double switch pipe Qpfc1And Qpfc2Driving
Signal differs 180 ° of phase, and every road power is the half of total power input.
The output voltage of power factor correcting converter is fixed and higher, and the input voltage amplitude of actual pulse power supply is uncommon
It hopes and is continuously adjusted, therefore need level-one DC-DC converter after power factor correcting converter.
As shown in figure 3, DC-DC converter uses LLC full-bridge controlled resonant converter, switching tube Qdc1-Qdc4Constitute full-bridge
Inverter circuit, Qdc1、Qdc4Using with driving signal all the way, Qdc2、Qdc3Using with driving signal all the way, two-way driving signal duty
Than identical and there are certain dead zones.Inductance Lr、LmWith capacitor CrForm series resonant network, transformer T and diode Ddc1, Ddc2
Full-wave rectifying circuit is constituted, capacitor C is filter capacitor.Resonant capacitance CrIt is connected on the primary side of transformer, plays the role of blocking, is made
Transformer is not easy to be saturated.LLC full-bridge converter makes the electricity at switching tube both ends using the resonance of capacitor and inductance element in circuit
Pressure or electric current change in sinusoidal rule for some time in a switch periods, so that all switch tube zeros in converter
Voltage is open-minded, and secondary end diode zero-current switching greatly reduces switching loss, improves power-efficient.
Output voltage by controlling DC-DC converter can adjust forward and reverse pulse voltage amplitude, and direct current-is straight
Current converter is used to provide the 100-300V DC voltage with certain adjustable range, the input as loop of power circuit.
As shown in figure 4, loop of power circuit includes 6 switching tube Qp、Q1-Q4、QoffWith 1 inductance Llimit.Loop of power circuit uses
It is topological based on full-bridge converter, wherein 4 switching tube Q1-Q4It is connected with bridge architecture, Q1And Q3It is opened for above and below a bridge arm two
Guan Guan, Q2And Q4For two switching tubes above and below another bridge arm.Switching tube QpThe outlet side and full-bridge for connecting DC-DC converter become
The input side of parallel operation, switching tube QoffBe connected in parallel on the both ends of workpieces processing and tool, the output end of inductance connection full-bridge converter and
Workpieces processing.
Switching tube uses the power MOS pipe of tri- kinds of different materials of Si, SiC and GaN in loop of power circuit, is respectively applied to slightly add
Three kinds of work, semifinishing and microfabrication electrical discharge machining occasions.Si metal-oxide-semiconductor is a kind of metal-oxide-semiconductor used earliest, low in
It has a meeting, an audience, etc. well under one's control and closes conducting resistance very little, working characteristics is preferable, and with the promotion of stress levels, Si metal-oxide-semiconductor conducting resistance is big, high temperature is steady
It is qualitative it is poor, working frequency is low, therefore Si metal-oxide-semiconductor is relatively specific for the roughing occasion not high to operating frequency requirements.SiC
Metal-oxide-semiconductor has the characteristics that blocking voltage is high, working frequency is high and heat-resisting ability is strong, while having on state resistance low again and switch
Small feature is lost, processes occasion especially suitable for 1200V or more high pressure-temperature, therefore SiC metal-oxide-semiconductor can satisfy high voltage
Semi-finished requirement is carried out under occasion.GaN metal-oxide-semiconductor uses newest manufacturing process, and switching frequency can reach several MHz,
And since GaN metal-oxide-semiconductor endobiosis capacitor is small, so that very little is lost in devices switch under high-frequency work, therefore GaN metal-oxide-semiconductor is applicable in
Occasion is processed in high frequency, therefore GaN metal-oxide-semiconductor can satisfy the requirement that microfabrication is carried out under high frequency occasion.
The signal that the on-off of 6 switching tubes is controlled in loop of power circuit is generated by impulse generator, and impulse generator uses
The control framework collectively formed by DSP and FPFA.DSP is master control chip in the present invention, and model TMS320F28335 is
A high-performance 32-bit float-point DSP processor of TI company.FPGA is high speed actuator, and model EP4CE15F23C8 is
The high speed processor of altera corp's Cyclone IV series, clock frequency are up to 472MHz, are equipped with two-way high speed, high-precision
Input and six tunnels high speed, high-precision DA conversion chip of the AD conversion chip for sampled signal are defeated for pwm control signal
Out.Real-time communication agreement is integrated between DSP and fpga chip.
Since the switch controlled signal driving capability that impulse generator issues is inadequate, it is not enough to the logical of driving switch pipe
It is disconnected, therefore driving circuit is needed between impulse generator and power circuit, for control signal that impulse generator is issued into
Row amplification, output certain voltage amplitude meet the driving signal of driving capability.
As shown in figure 5, driving circuit drives 6 metal-oxide-semiconductors, each driving core using 3 identical metal-oxide-semiconductor driving chips
Piece and its external circuit be all it is identical, one of driving chip and its external circuit are as shown in Figure 5.Driving chip uses TI
The UCC27214 chip of company, the ability with high-side driver, is highly suitable as the driving chip of switching tube in full-bridge circuit.
Supply voltage VDDIt is powered using+15V to 7 pin VDD of chip, control the signal PWM1 and PWM2 that impulse generator issues are sent respectively
The high side for entering chip inputs 1 pin HI and downside inputs 2 pin LI, and a bootstrapping electricity is connected between 13 pin HB and 11 pin HS
Hold CBOOT, high side 12 pin HO of output are by amplified high side driving signal by grid resistance RHOIt is sent into high side metal-oxide-semiconductor Q1's
Grid, 11 pin HS connection high side metal-oxide-semiconductor Q1Source electrode, downside export 6 pin LO amplified low side driving signal is passed through
Grid resistance RLOIt is sent into downside metal-oxide-semiconductor Q2Grid, 5 pin COM connection downside metal-oxide-semiconductor Q2Source electrode.
Gap voltage and gap current are controlled respectively in the different stages, it is necessary to have detection electricity precisely in real time
Detector gap voltage and current is carried out on road, then the signal that will test is sent into impulse generator.
As shown in fig. 6, detection circuit is made of voltage detecting circuit and current detection circuit, including 1 potentiometer W, 2
Operational amplifier U1And U2And 1 current sensor CS.One end of potentiometer W is connected with tool, the other end and workpieces processing phase
Even, movable contact and operational amplifier U1Non-inverting input terminal be connected, operational amplifier U1Inverting input terminal be connected with output end,
Constitute a voltage follower.The signal detection termination of current sensor CS is connected in processing circuit, current sensor CS's
Signal output end and operational amplifier U2Non-inverting input terminal be connected, operational amplifier U2Inverting input terminal be connected with output end,
Constitute a voltage follower.
Potentiometer W is used to detect gap voltage between workpieces processing and tool, by movable contact gap voltage press than
Operational amplifier U is sent into after example partial pressure1, the resistance value of potentiometer W should choose tens of to hundreds of M Ω, so that it is to processing gap
Influence minimizes, and in micro EDM, pulsewidth is very narrow, it is therefore desirable to the detection that voltage detecting circuit (6) can be very fast
To the variation of processing gap voltage, the demand of micro EDM can satisfy using the method that voltage detects.Electric current
Sensor CS uses ACS758LCB-100B-PFF-T model, ambipolar high current signal can be converted to unipolar small electricity
Signal is pressed, detection accuracy is high, realizes convenient and reliable.
Based on the novel spark pulse power that aforementioned present invention provides, processing method specific embodiment party provided by the invention
Formula is as follows:
In a positive polarity process, switching tube QpAnd Q4Remain conducting, Q2And QoffIt remains shutdown, opens
Close pipe Q1、Q3With inductance LlimitA Buck code converter is constituted, impulse generator is to the gap voltage of sampling and the number of electric current
Word signal, after segmentation carries out voltage and current control, output pwm control signal drives switching tube Q after overdrive circuit amplifies1
And Q3Alternately on-off；In a negative polarity process, switching tube QpAnd Q3Remain conducting, Q1And QoffRemain pass
It is disconnected, switching tube Q2、Q4With inductance LlimitConstitute a Buck code converter, gap voltage and electric current of the impulse generator to sampling
Digital signal, segmentation carry out voltage and current control after, export pwm control signal driving switch after overdrive circuit amplifies
Pipe Q2And Q4Alternately on-off；
After the completion of process, gap enters the deionization stage, controls without voltage and current, impulse generator output
Pwm control signal drives 4 switching tube Q after overdrive circuit amplifies1-Q4It is all off, driving switch pipe again after of short duration delay
QoffIt is open-minded, the process of accelerating gap deionization.
Based on the novel spark pulse power that aforementioned present invention provides, gap voltage and gap current provided by the invention
Discrete control method specific embodiment it is as follows:
In the processing of the novel fine electric spark pulse power in a process-cycle each stage schematic diagram as shown in fig. 7, one
Process-cycle includes process segment and deionization stage, and the process segment includes striking stage and discharge regime, a processing week again
0~t of phase3In period, t at the time of the deionization stage starts2And process-cycle t at the time of terminate3All set
, the switch instant t of striking stage and discharge regime1At the time of being that gap is breakdown, influenced by gap state and property
Change constantly.In the striking stage, gap is not also breakdown, and gap current very little is almost 0, and gap voltage is established rapidly simultaneously
Rise, gap voltage rises the too fast biggish overshoot of generation in order to prevent, influences the stability of whole system, it is necessary to gap electricity
Pressure is controlled, and stablizes it near a steady state value；When gap is breakdown, discharge regime is entered, by backlash characteristics
It influences gap voltage to drop sharply near a metastable maintenance voltage, gap current rises rapidly, and at this moment immediately will
Voltage control is converted to current control, and gap current is stablized near a steady state value, prevents overcurrent from leading to gap shorting, and
And the quality of processing can be improved in stable electric current.Voltage control and current control are worked independently, are not interfere with each other.
Discrete control main program flow chart in impulse generator main program Initialize installation as shown in figure 8, can set
Process-cycle T1, the cycle T in deionization stage 2, gap voltage given value vref, gap current given value iref, gap voltage
Threshold value vth and gap current threshold value ith.Detection circuit by the analog signal vgap of the gap voltage of sampling and gap current and
Igap is respectively fed to two-way AD conversion chip in impulse generator, obtains the digital signal vgapd of gap voltage and gap current
And igapd.When a process-cycle T1 starts, into the process segment, main program judges the digital signal vgapd of gap voltage
Whether voltage threshold vth is less than, and whether the digital signal igapd of gap current is greater than current threshold ith, in main program
Equipped with variable nctr, variable nctr is set 1 when Rule of judgment is unsatisfactory for, being now in the striking stage takes voltage control, will be electric
The pwm control signal vpwm of voltage-controlled subprogram output is sent into high speed D/A conversion chip；Once Rule of judgment meets, will become immediately
Amount nctr sets 0, is now in discharge regime and takes current control, the pwm control signal ipwm that current control subprogram is exported
It is sent into high speed D/A conversion chip.When the deionization stage, T2 started, into the deionization stage, gap voltage given value vref and
Gap given value of current value iref is set as 0, without voltage control and current control.
Voltage controls subroutine flow chart as shown in figure 9, the digital signal vgapd of gap voltage, which is sent into voltage, controls sub- journey
Sequence, compared with gap voltage given value vref after generate error signal, which is calculated by PID control program,
Calculated result generates program using PWM wave and is handled, and output frequency fixes, the pwm control signal vpwm of variable duty ratio.
Current control subroutine flow chart is as shown in Figure 10, and the digital signal igapd of gap current is sent into current control
Program, compared with gap current given value iref after generate error signal, which is counted by PID control program
It calculates, calculated result generates program using PWM wave and handled, and output frequency fixes, the pwm control signal of variable duty ratio
ipwm。
Determine that voltage control switches to the time of current control, voltage control and electric current by the state change of variable nctr
Control, which realizes, to be worked independently from each other, and DA conversion chip can be just ultimately delivered to by only corresponding to the pwm control signal under control model
Output, to control the on-off of respective switch pipe in loop of power circuit (3).
Claims (6)
1. a kind of fine electric spark pulse power, including power factor correcting converter, DC-DC converter, loop of power circuit,
Driving circuit, impulse generator, detection circuit, alternating voltage pass through power factor correcting converter and DC-DC converter
It exports adjustable dc voltage to power to loop of power circuit, loop of power circuit provides positive-negative polarity voltage to gap, between detection circuit detection
The voltage and current of gap is sent into impulse generator, impulse generator output control signal, and control signal amplifies through overdrive circuit
The on-off of switching tube in driving signal driving power circuit is generated afterwards, which is characterized in that the loop of power circuit includes 6 switching tubes
Qp、Q1、Q2、Q3、Q4、QoffWith 1 inductance Llimit, wherein 4 switching tube Q1-Q4It is connected with bridge architecture, switching tube QpConnection
The outlet side of DC-DC converter and the input side of full-bridge converter, switching tube QoffAfter in parallel with gap, one end passes through electricity
Feel LlimitIt is connected to the midpoint of one of bridge arm, the other end is directly connected to the midpoint of another bridge arm.
2. the fine electric spark pulse power according to claim 1, which is characterized in that the impulse generator uses DSP
The control framework collectively formed with FPGA.
3. the fine electric spark pulse power according to claim 1, which is characterized in that switching tube selects in the loop of power circuit
The power MOS pipe of tri- kinds of different materials of Si, SiC or GaN is selected, wherein Si is applied to roughing electrical discharge machining occasion, SiC is applied
In semifinishing electrical discharge machining occasion, GaN is applied to microfabrication electrical discharge machining occasion.
4. the processing method based on the described in any item fine electric spark pulse powers of claim 1-3, which is characterized in that including
Following steps:
Step 1: in a positive polarity process, switching tube QpAnd Q4Remain conducting, Q2And QoffRemain shutdown,
Switching tube Q1、Q3With inductance LlimitConstitute a Buck code converter, impulse generator control switch pipe Q1And Q3Alternately on-off；
In a negative polarity process, switching tube QpAnd Q3Remain conducting, Q1And QoffRemain shutdown, switching tube Q2、Q4
With inductance LlimitConstitute a Buck code converter, impulse generator control switch pipe Q2And Q4Alternately on-off；
Step 2: after the completion of process, disconnecting 4 switching tube Q1-Q4, then connect switching tube Qoff, the mistake of accelerating gap deionization
Journey.
5. processing method according to claim 4, which is characterized in that if gap current overcurrent occurs in process,
Then disconnect switching tube QpTerminate processing.
6. the Discrete control method based on the described in any item fine electric spark pulse powers of claim 1-3, which is characterized in that
Include the following steps:
Step 1: the setting process-cycle, voltage and current threshold value, realizing the Initialize installation of impulse generator；
Step 2: the analog signal of detection circuit real-time sampling gap voltage and electric current is AD converted by impulse generator
Afterwards, the digital signal of gap voltage and electric current is obtained；
Step 3: when a process-cycle starts, impulse generator is believed according to gap voltage digital signal, gap current number
Number, the relationship between voltage threshold and current threshold determine control strategy, if the digital signal of gap current is less than current threshold
And the digital signal of voltage is greater than voltage threshold, then carries out voltage control；Otherwise it is switched to current control.
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| CN111431432A (en) * | 2020-01-20 | 2020-07-17 | 南京理工大学 | Fine electric spark pulse power supply based on Boost and RC circuit |
| CN111193428B (en) * | 2020-01-20 | 2022-09-20 | 南京理工大学 | Micro high-frequency grouping pulse power supply |
| CN113271030B (en) * | 2021-05-25 | 2022-11-29 | 中国工程物理研究院机械制造工艺研究所 | Pulse generation control method for pulse power supply |
| CN114252681B (en) * | 2021-12-17 | 2023-11-03 | 山东豪迈机械科技股份有限公司 | Electric spark machining gap leakage current detection control circuit and control method thereof |
| CN115070142B (en) * | 2022-06-01 | 2023-09-05 | 南京理工大学 | Novel peak current control method applied to electric spark machining pulse power supply |
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