CN110328419A - No resistive spark pulse power and its processing and clearance discharge condition recognition methods - Google Patents
No resistive spark pulse power and its processing and clearance discharge condition recognition methods Download PDFInfo
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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
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Abstract
The invention discloses the wire pulse power in a kind of no resistive and its processing and clearance discharge condition recognition methods, circuit includes loop of power circuit, driving circuit, FPGA controller, voltage detecting circuit and current detection circuit, when being conducting to maximum waiting breakdown time threshold value from first switch tube, the gap voltage detected in the period calculates average voltage, if average voltage is floating voltage, identification gap is light condition；Etc. otherwise first switch tubes disconnect, and after dead time, when second switch is connected, the variation of detector gap electric current calculating current descending slope, if slope variation rate is more than descending slope change rate threshold value, then identify that gap for short circuit, if the fruit slope is almost unchanged or variation is small, identifies that gap is regular picture；Necessary foundation is provided according to the gap state of identification for the direction of feed and speed of servo-system.The present invention improves the accuracy of identification of power supply clearance discharge condition, and then improves power supply processing efficiency and discharge rate.
Description
Technical field
The present invention relates to pulse power technologies, and in particular to a kind of no resistive spark pulse power and its processing and gap
Discharge condition recognition methods.
Background technique
A core of the pulse power as electric spark machine tool, decides roughness, the electrode of finished surface
Silk loss, machining accuracy, processing efficiency and utilization rate of electric energy etc., therefore part processing proposes efficiency of the pulse power etc.
Very high requirement.There is the pulse power of quite a few commercial lathe to use in middle wire wire cutting electric spark industrial circle
Resistance-type transistor power supply adjusts output electric current by the series resistance value size in regulation power circuit, but such
Very big, low efficiency is lost in the pulse power.
In addition, power supply clearance discharge condition is unique foundation of lathe servo tracking, the gap of the pulse power is precisely identified
Discharge condition is conducive to improve processing efficiency and discharge rate.Traditional clearance discharge condition identification, it is flat according to filtered gap
Equal voltage carries out state recognition, detection time in Millisecond, and each process-cycle generally in Microsecond grade, therefore using tradition
Method not can know that the gap discharge situation of each process-cycle, the harmful pulse of processing in time (such as wink caused by chip removal is bad
When short circuit).Secondly, according to different process requirements, than will do it corresponding adjustment between pulsewidth arteries and veins, leading to three kinds when actual processing
The relative size of the average voltage threshold value of clearance discharge condition can also change, because this gap average voltage state identification method not
It is applicable in again.
Summary of the invention
The purpose of the present invention is to provide a kind of clearance discharge condition recognition methods of the wire pulse power in no resistive.
The technical solution for realizing the aim of the invention is as follows: the wire pulse power in a kind of no resistive, including loop of power circuit,
Driving circuit, FPGA controller, voltage detecting circuit and current detection circuit, wherein loop of power circuit is used to provide breakdown to gap
Discharge energy after voltage and breakdown；The voltage detecting circuit and current detection circuit for real-time detection gap voltage and
Current signal is filtered and obtains after improving analog signal, then carries out analog-to-digital conversion and obtain digital signal to FPGA controller；
The FPGA controller is used to export pwm control signal to driving circuit, together according to electric current, voltage and given target component
When electric current and voltage signal are analyzed, identify the clearance discharge condition of each process-cycle, be servo-system feeding side
Foundation is provided to speed；The driving circuit carries out digital isolation and amplification to pwm control signal, generates driving signal driving
The on-off of metal-oxide-semiconductor in loop of power circuit.
The loop of power circuit using OCL output capacitance-less voltage-dropping type synchronous rectification Buck type circuit based on topology, including input
Pressure stabilizing electrolytic capacitor, first switch tube, second switch, inductance and diode, wherein first switch tube and second switch one
End connection, first switch tube and the second switch other end are connect with the both ends of input pressure stabilizing electrolytic capacitor respectively, first switch
Pipe and second switch tie point and inductance connection, inductance the other end connection diode anode, the cathode of diode and
The tie point of second switch and input pressure stabilizing electrolytic capacitor is separately connected gap both ends.
The first switch tube and second switch select the N-channel of the model IPP200N25NFD of infineon company
MOSFET, the inductance use power flat conductor inductance, and the diode selects model SBR60A300CT.
The FPGA controller chooses model EP4CE15F23C8.
The driving circuit adds the half-bridge driven chip structure not being isolated, digital isolator selection type using digital isolator
Number chip for being ADUM1100, half-bridge driven chip select the driving chip of model UCC27714, and ADUM1100 receives FPGA
PWM output signal, then export primary side of the signal to UCC27714 of isolation, amplify through driving chip, then go driving power
Metal-oxide-semiconductor in circuit.
The voltage detecting circuit uses Instrument Transporting Circuitry.
The current detection circuit includes the conditioning circuit that Hall current sensor and operational amplifier constitute rear class.
A kind of processing method based on the wire pulse power in no resistive, includes the following steps:
Step 1: in the striking stage, i.e., when a process-cycle starts, pwm signal being generated by FPGA controller, through electricity of overdriving
After the amplification of road, control first switch tube conducting, second switch shutdown provides input voltage to load gap；
Step 2: if waiting in breakdown time threshold value in the maximum of setting, current detection circuit detects that electric current rises, voltage inspection
Slowdown monitoring circuit detects that voltage declines, then gap is punctured or short-circuited, and into during gap discharge, first switch tube continues to be connected,
It until detecting that electric current reaches desired value or paradoxical discharge, is controlled by FPGA and generates pwm signal, control first switch tube is disconnected
It opens, it is inductive current afterflow that after dead time, then to control second switch open-minded, when electric current is to zero, is cut into gap
The only stage turns off second switch at this time；
If current detection circuit and voltage detecting circuit are still after the maximum waiting breakdown time threshold value of first switch tube conducting setting
Do not detect gap breakdown, then this process-cycle does not discharge, first switch tube, waits and enters next process-cycle；
Step 3: repeating above-mentioned two step, realize the circulation of process-cycle.
A kind of clearance discharge condition recognition methods based on the wire pulse power in no resistive, includes the following steps:
Step 1: when a process-cycle starts, i.e., from first switch tube (Q 1) it is conducting to the maximum waiting breakdown time threshold of setting
When value, the gap voltage detected in the period calculates average voltage, if average voltage is floating voltage, identification gap is sky
Load state；Otherwise it is transferred to step 2 and carries out regular picture and short circuit dischange judgement；
Step 2: when first switch tube (Q 1) disconnect, and after dead time, second switch (Q 2) conducting when, detector gap electric current
The change rate of calculating current descending slope, if slope variation rate is more than the descending slope change rate threshold value of setting, between identification
Gap is short circuit, if fruit slope is almost unchanged or variation is small, identifies that gap is regular picture；
Step 3: repeating steps 1 and 2, identify each process-cycle clearance discharge condition.
Compared with prior art, the present invention its remarkable advantage: 1) pulse power structure of the present invention is simple, inductive energy storage, height
Effect energy conservation, and it is not necessarily to high-voltage breakdown circuit, control flexibility and reliability；2) power topology of the present invention uses the drop of OCL output capacitance-less
Die mould synchronous rectification Buck type circuit, and inductance outlet side connect a diode, can prevent gap voltage shake and
Electric current reverse flow occurs；3) voltage detecting of the present invention uses operational amplifier circuit, and current detecting adds conditioning using Hall current sensor
Circuit, it ensure that the stabilization of voltage and current measurement is accurate, high bandwidth and real-time, the single process-cycle discharge condition for after
It is real-time identification provide guarantee；4) recognition methods of the present invention combines the real-time voltage and electric current in gap, discharge condition identification
Accuracy the time is not influenced than, process-cycle between by electric discharge pulsewidth and arteries and veins, a variety of machined parameters can be adjusted arbitrarily.
Detailed description of the invention
Fig. 1 is the system architecture block diagram of the invention without the wire pulse power in resistive.
Fig. 2 is the loop of power circuit circuit diagram of the invention without the wire pulse power in resistive.
Fig. 3 is digital isolator and driving chip principle application drawing used in the present invention.
Fig. 4 is differential voltage sample circuit figure.
Fig. 5 is Hall current sensor application drawing.
Fig. 6 is the discharge waveform schematic diagram of single process-cycle when middle wire is processed.
Fig. 7 is the voltage and current schematic diagram of three kinds of clearance discharge conditions.
Fig. 8 is the unloaded present invention, the gap voltage of regular picture and short-circuit three kinds of states, Current experiments waveform diagram.
Fig. 9 between distinct pulse widths arteries and veins of the present invention than when Continuous maching electric discharge gap voltage, Current experiments waveform diagram.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention program is further illustrated.
As shown in Figure 1, including loop of power circuit, driving circuit, field programmable gate array without the wire pulse power in resistive
FPGA controller, voltage detecting circuit and current detection circuit.Wherein loop of power circuit is responsible for providing breakdown voltage to gap and be hit
Discharge energy after wearing；Voltage detecting circuit, current detection circuit real-time detection load the voltage and current in (gap), signal warp
Analog signal is obtained after crossing filtering and conditioning, analog signal obtains digital signal by analog-to-digital conversion, finally gives FPGA controller；
FPGA controller exports pwm control signal to driving according to obtained electric current, voltage detection signal and given target component
Circuit, driving circuit carry out digital isolation and amplification to pwm control signal, generate metal-oxide-semiconductor in driving signal driving power circuit
On-off.Analytic operation of the voltage, current signal of detection Jing Guo FPGA controller simultaneously, to identify each process-cycle in real time
Clearance discharge condition, and the signal of corresponding state is exported to servo tracking by FPGA, be servo-system direction of feed and
Feed speed provides necessary foundation.
As shown in Fig. 2, loop of power circuit using OCL output capacitance-less voltage-dropping type synchronous rectification Buck type circuit based on topology, packet
Include an input pressure stabilizing electrolytic capacitorC in, 2 switching tubesQ 1、Q 2, 1 inductanceL 1With a diodeD out。Q 1WithQ 2Make respectively
For upper down tube, andL 1Synchronous rectification topology is constituted,L 1Another terminationD outAnode,D outCathode and down tubeQ 2The other end
Connect gap both ends.Due to connecting a diode in inductance outlet side, it can prevent that gap voltage from shaking and that electric current occurs is reversed
Stream.
Switching tube uses the power MOS pipe of SiC material in loop of power circuit, has chosen Metal-Oxide Semiconductor field-effect
Transistor (MOSFET).Infineon company is selected here according to the demand of practical fast wire winding WEDM pulse power supply
The N-channel MOS FET of model IPP200N25NFD, hourglass source electrode pressure resistanceV DSUp to 250V, rated currentI DFor 61A, in conducting
Resistance is less than 22 milliohms, the maximum surge current 256A allowed, and working frequency is up to 1MHz, can be used in high-frequency, big electricity
The high speed WEDM of the middle low power of stream.Inductance uses power flat conductor inductance, inductance value 3.3uH, and diode is selected
Model SBR60A300CT, reverse withstand voltage 300V, forward direction are continuously turned on electric current 60A.
The signal that the on-off of metal-oxide-semiconductor is controlled in loop of power circuit is generated by FPGA controller.FPGA chooses in the present invention
Model EP4CE15F23C8, is the high speed processor of altera corp Cyclone IV series, and clock frequency is up to
472MHz is equipped with two-way high speed, input of the high-precision AD conversion chip for sampled signal.
The mutual shadow being not enough in view of FPGA between the on-off and loop of power circuit and light current circuit of driving switch pipe
It rings, therefore needs the driving circuit of isolated form between FPGA of the present invention and power circuit, for the control signal issued to FPGA
It amplifies, output certain voltage amplitude meets the driving signal of driving capability.
As shown in figure 3, this isolated form driving circuit, the half-bridge driven chip not being isolated using digital isolator plus is constituted.
Digital isolator selects the chip of model ADUM1100, receives the PWM output signal of FPGA, then export the signal of isolation to
The primary side of driving chip UCC27714, amplifies through driving chip, then removes the metal-oxide-semiconductor in driving power circuit.UCC27714 can lead to
It crosses HS foot voltage when independent input configures high and low side, completely operation and is up to 600V, filling/sourcing current is 4A, is exclusively used in driving function
Rate metal oxide semiconductor field effect tube (MOSFET) or insulated gate bipolar transistor.
The either control of loop of power circuit itself, Yao Shixian defencive function and etc. energy discharges, or in order to improve electric discharge
Rate, and gap discharge real-time status is provided for servo tracking system, these are required in real time, accurately measure voltage & current.Such as
Shown in Fig. 4, voltage detecting circuit uses Instrument Transporting Circuitry (differential voltage sampling), has high input impedance, high common mode inhibition
, bandwidth high, sampling accurate the advantages that more convenient than, gain adjustment；As shown in figure 5, current detection circuit is sensed using Hall current
Device and operational amplifier constitute the conditioning circuit of rear class, have many advantages, such as that isolation, safe and reliable, precision is high.The two is all made of
At a high speed, the amplifier chip LMH6643MAX/NOPB of wide bandwidth, anti-interference strong, accuracy height, stability are good.Current Hall sensing
Device selects the electric current chip of the model ACS732 of Allegro company, and output bandwidth can achieve 1MHz, range 40A, meets
The testing requirements of this pulse power.
In conclusion the present invention, without the wire pulse power in resistive, power topology uses the decompression of OCL output capacitance-less
Type synchronous rectification Buck type circuit, and in inductance outlet side one diode of series connection, it can prevent gap voltage from shaking and sending out
Raw electric current reverse flow.Pulse power structure is simple, inductive energy storage, without hindrance, energy-efficient, and is not necessarily to high-voltage breakdown circuit, control
Flexibility and reliability processed.
As shown in figure 5, a complete process-cycle, including process segment and deionization stage, process segment include again
Striking stage and discharge regime,t dFor the striking stage,t onFor discharge regime,t offFor the deionization stage, it is one that three, which add up,
A complete process-cycleT s.Here by taking equal energy triangular wave processing as an example, when a process-cycle starts, i.e.,t 0Moment,Q 1
Conducting, is equivalent to the full duty ratio of synchronous rectification Buck type power circuit and opens, and generates a comparison at the gap both ends of output end
High breakdown voltage (also referred to as floating voltage), size is input voltage, is convenient for when servo system control gap is close enough,
Can disruptive discharge, be arranged a maximum waiting breakdown timet dm(i.e.t dMaximum value), if working ast dIt is greater thant dmWhen, it does not examine also
Gap voltage decline is measured, electric current rises, then it is assumed that do not puncture, directly turn offQ 1, do not discharge (t onIt is zero), into deionization
Stage.
If working ast dIt is less than or equal tot dmWhen, it detects gap breakdown, then enters discharge regime, current detection circuit detects
Gap current reaches preset target value, just disconnectedQ 1, behind the dead zone of 100ns, then it is open-mindedQ 2, continuous current circuit is provided, electric current is opened
Begin to decline, when electric current falls to 0, disconnectQ 2, discharge regime terminates, initially enters the deionization stage, be continued until next
A process-cycle.
If gap is short-circuit condition, do not have the striking stage (t d), as long asQ 1One is logical, and electric current begins to rise, and then arrives
Up to target value, disconnectQ 1, open after dead timeQ 2, electric current drops to 0, disconnectsQ 2, until this process-cycle terminates.
In conclusion the control processing method without the wire pulse power in resistive, includes the following steps:
Step 1: striking stage (gap is not breakdown), when a process-cycle starts, pwm signal being generated by FPGA, is passed through
After driving circuit amplification, controlQ 1Conducting,Q 2Shutdown provides relatively high breakdown voltage to load gap, and size is equal to input electricity
Pressure can disruptive discharge in order to when clearance distance is closer.If working asQ 1It opens the maximum of 5us(setting and waits breakdown time threshold
Value, i.e., within this time, provide high pressure to gap), Current Voltage detection does not detect gap breakdown, then this process-cycle
It does not discharge, disconnectsQ 1.It waits and enters next process-cycle.
Step 2: if working asQ 1Service time be less than 5us when, detect electric current rise, voltage decline, then gap it is breakdown (or
Short circuit), into during gap discharge,Q 1Continue to open and (do not limited by the time threshold of 5us), until detecting that size of current reaches
After to desired value (or paradoxical discharge, such as short circuit), pwm signal is generated by FPGA, is controlledQ 1It disconnects, by the dead zone of 100ns
After time, then controlQ 2It is open-minded, it is inductive current afterflow.When electric current is to zero, into gap turn off phase (between arteries and veins), close at this time
It is disconnectedQ 2。
Step 3: repeating two steps of appeal, realize the circulation of process-cycle.
Fig. 6 is the gap voltage current waveform schematic diagram of three process-cycles, includes three kinds of clearance discharge conditions, i.e., empty
Load, regular picture and short circuit.As can be seen that gap voltage is very high when unloaded, it is input voltage, and have the leakage current of very little；
For regular picture state, when the process-cycle just starts, gap output voltage be floating voltage, continue for some time, when
When gap punctures, gap voltage quickly falls to maintenance voltage, and gap current also rises rapidly at this time；When gap is short-circuit condition
When, as soon as processing is at the beginning, gap voltage declines very low, and electric current also rises rapidly at this time, and the depression of order under electric current
The slope variation of section is bigger.Accordingly, the invention also provides a kind of new clearance discharge condition monitoring method, by detection from
After the offer high pressure moment arrivest dmGap average voltage and electric current decline stage in (maximum breakdown waiting time) time
Slope variation specifically comprise the following steps: to judge clearance discharge condition
Step 1: gap real-time voltage current waveform being measured by voltage detecting circuit and current detection circuit, is transmitted to after AD conversion
FPGA module, after software filtering, when a process-cycle is started, i.e., fromQ 1It is set when opening to next 5us(
Maximum waits breakdown time threshold value) in voltage waveform measure, and calculate average voltageV avg, note zero load, regular picture, short
The average voltage of line state is respectivelyV avg1、V avg2、V avg3；
It is tested on middle wire electrical discharge machine tool, obtains gap in unloaded, regular picture and short-circuit three kinds of states
When true gap voltage, current waveform figure is as shown in figure 8, have to draw a conclusion: when unloaded,V avg1Size is equal to floating voltage；
When regular picture,V avg2Between floating voltage and maintenance voltage；When short-circuit,V avg3Size is equal to short-circuit voltage；It is wherein unloaded
Voltage is equal to the maximum output voltage of the pulse power, and generally selection 80V, maintenance voltage generally take 20V, is slightly larger than short-circuit voltage,
Short-circuit voltage is generally in 10V or less, it can be seen thatV avg1It is much larger thanV avg2,V avg2It is slightly larger thanV avg3.However, if actual processing
Middle servo tracking is followed relatively tighter, and pulse power continuous discharge, then breakdown waiting time when regular picture is almost nil, at this time
'sV avgShort-circuit voltage is approached, therefore light condition, regular picture and short-circuit condition can be identified according to this average voltage size
It can not be identified completely according to average voltage, i.e., when calculated average voltageV avgWhen for floating voltage, identification gap is unloaded shape
State, being otherwise transferred to step 2, further judgement is regular picture or short-circuit condition.
Step 2: whenQ 1It disconnects, waits dead time (generally taking 100 ns),Q 2When logical, electric current is begun to decline, and passes through electric current
Sampling obtains the real-time waveform of electric current decline stage, the variation of calculating current descending slope, if slope variation obtains greatly, more than setting
Fixed descending slope threshold value then identifies that gap for short circuit, if fruit slope is almost unchanged or variation is small, identifies that gap is normally to put
Electricity.
Step 3: completing the clearance discharge condition identification of a process-cycle.Steps 1 and 2 are repeated, identify each process-cycle
Clearance discharge condition, convenient for providing the important indicator of direction of feed and feed speed for servo tracking.Utilize gap of the invention
Discharging headlamp method carries out servo tracking, obtains continuous discharge waveform as shown in Figure 9, can be with indirect proof, the present invention
The critical output average voltage threshold value of this novel recognition methods proposed, three kinds of discharge conditions determines, not by electric discharge pulsewidth and
The time, a variety of machined parameters can adjust arbitrarily than the limitation of, process-cycle between arteries and veins.
Claims (9)
1. without the wire pulse power in resistive, which is characterized in that including loop of power circuit, driving circuit, FPGA controller, voltage inspection
Slowdown monitoring circuit and current detection circuit, wherein loop of power circuit is used to provide the discharge energy after breakdown voltage and breakdown to gap；Institute
It states voltage detecting circuit and current detection circuit is used for the voltage and current signals in real-time detection gap, after being filtered and improving
Analog signal is obtained, then carries out analog-to-digital conversion and obtains digital signal to FPGA controller；The FPGA controller is used for according to electricity
Stream, voltage and given target component export pwm control signal to driving circuit, while dividing electric current and voltage signal
Analysis, identifies the clearance discharge condition of each process-cycle, provides foundation for the direction of feed and speed of servo-system；The driving
Circuit carries out digital isolation and amplification to pwm control signal, generates the on-off of metal-oxide-semiconductor in driving signal driving power circuit.
2. the wire pulse power in no resistive according to claim 1, which is characterized in that the loop of power circuit is used without defeated
It is topological based on the voltage-dropping type synchronous rectification Buck type circuit of capacitor out, including input pressure stabilizing electrolytic capacitor (C in), first switch tube
(Q 1), second switch (Q 2), inductance (L 1) and diode (D out), wherein first switch tube (Q 1) and second switch (Q 2) one
End connection, first switch tube (Q 1) and second switch (Q 2) other end respectively with input pressure stabilizing electrolytic capacitor (C in) both ends connect
It connects, first switch tube (Q 1) and second switch (Q 2) tie point and inductance (L 1) connection, inductance (L 1) the other end connection two
Pole pipe (D out) anode, diode (D Out)Cathode and second switch (Q 2) and input pressure stabilizing electrolytic capacitor (C in) connection
Point is separately connected gap both ends.
3. the wire pulse power in no resistive according to claim 2, which is characterized in that the first switch tube (Q 1) and
Second switch (Q 2) select infineon company model IPP200N25NFD N-channel MOS FET, the inductance (L 1) adopt
With power flat conductor inductance, the diode selects model SBR60A300CT.
4. the wire pulse power in no resistive according to claim 1, which is characterized in that the FPGA controller selection type
Number be EP4CE15F23C8.
5. the wire pulse power in no resistive according to claim 1, which is characterized in that the driving circuit is using number
Isolator adds the half-bridge driven chip structure not being isolated, and digital isolator selects the chip of model ADUM1100, half-bridge driven
Chip selects the driving chip of model UCC27714, and ADUM1100 receives the PWM output signal of FPGA, and then output is isolated
Signal amplifies to the primary side of UCC27714 through driving chip, then removes the metal-oxide-semiconductor in driving power circuit.
6. the wire pulse power in no resistive according to claim 1, which is characterized in that the voltage detecting circuit uses
Instrument Transporting Circuitry.
7. the wire pulse power in no resistive according to claim 1, which is characterized in that the current detection circuit includes
Hall current sensor and operational amplifier constitute the conditioning circuit of rear class.
8. the processing method based on the wire pulse power in no resistive, which comprises the steps of:
Step 1: in the striking stage, i.e., when a process-cycle starts, pwm signal being generated by FPGA controller, through electricity of overdriving
After the amplification of road, control first switch tube (Q 1) conducting, second switch (Q 2) shutdown, input voltage is provided to load gap；
Step 2: if waiting in breakdown time threshold value in the maximum of setting, current detection circuit detects that electric current rises, voltage inspection
Slowdown monitoring circuit detects that voltage declines, then gap is punctured or short-circuited, into during gap discharge, first switch tube (Q 1) continue to lead
It is logical, it until detecting that electric current reaches desired value or paradoxical discharge, is controlled by FPGA and generates pwm signal, control first switch tube
(Q 1) disconnect, after dead time, then control second switch (Q 2) open-minded, it is inductive current afterflow, when electric current is to zero,
Into gap turn off phase, turn off at this time second switch (Q 2)；
If first switch tube (Q 1) conducting setting it is maximum wait breakdown time threshold value after, current detection circuit and voltage detecting electricity
Road is still without gap breakdown is detected, then this process-cycle does not discharge, first switch tube (Q 1), it waits and enters next processing week
Phase；
Step 3: repeating above-mentioned two step, realize the circulation of process-cycle.
9. the clearance discharge condition recognition methods based on the wire pulse power in no resistive, which comprises the steps of:
Step 1: when a process-cycle starts, i.e., from first switch tube (Q 1) it is conducting to the maximum waiting breakdown time threshold of setting
When value, the gap voltage detected in the period calculates average voltage, if average voltage is floating voltage, identification gap is sky
Load state；Otherwise it is transferred to step 2 and carries out regular picture and short circuit dischange judgement；
Step 2: when first switch tube (Q 1) disconnect, and after dead time, second switch (Q 2) conducting when, detector gap electric current
The variation of calculating current descending slope identifies that gap is short circuit if slope variation is more than descending slope change rate threshold value, if
Fruit slope is almost unchanged or variation is small, then identifies that gap is regular picture；
Step 3: repeating steps 1 and 2, identify each process-cycle clearance discharge condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910659351.6A CN110328419B (en) | 2019-07-22 | 2019-07-22 | Non-resistance electric spark pulse power supply and machining and gap discharge state identification method thereof |
Applications Claiming Priority (1)
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| CN113271030A (en) * | 2021-05-25 | 2021-08-17 | 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 |
| CN114888373A (en) * | 2022-06-01 | 2022-08-12 | 南京理工大学 | Three-level BUCK pulse power supply for electric spark machining |
| CN115070142A (en) * | 2022-06-01 | 2022-09-20 | 南京理工大学 | Novel peak current control method applied to electric spark machining pulse power supply |
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