CN208297691U - There is resistance pulse power wire cutting clearance discharge condition detection circuit - Google Patents
There is resistance pulse power wire cutting clearance discharge condition detection circuit Download PDFInfo
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- CN208297691U CN208297691U CN201820893612.1U CN201820893612U CN208297691U CN 208297691 U CN208297691 U CN 208297691U CN 201820893612 U CN201820893612 U CN 201820893612U CN 208297691 U CN208297691 U CN 208297691U
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Abstract
There is resistance pulse power wire cutting clearance discharge condition detection circuit.Being related to one kind has resistance pulse power detection circuit, more particularly to has resistance pulse power wire cutting clearance discharge condition detection circuit.Judge accurate, compact-sized, stable.High-frequency direct-current positive voltage terminal (P100) is formed into a loop by workpiece, molybdenum filament, current divider FLQ, jumper CB1, current-limiting resistance R1~R9, current-limiting resistance on-off switch S1~S9 to high frequency DC voltage negative terminal (G100), it is equipped with the connecting pin A between the high-frequency direct-current positive voltage terminal and workpiece, the connecting pin B is equipped between the molybdenum filament and current divider FLQ;The connecting pin A and the connecting pin B form gap voltage sampling end；The gap voltage sampling end is equipped with sequentially connected Voltage stabilizing module, integrates module, voltage follow module, phaselocked loop U1, optocoupler OP2 and single-chip microcontroller.The utility model has the characteristics that judge accurate, compact-sized, stable.
Description
Technical field
The utility model relates to one kind resistance pulse power detection circuit, more particularly to have resistance pulse power wire cutting gap
State detection circuit.
Background technique
Existing quick-wire-moving linear cutting machine control system is generally using there is the resistance pulse power, the disadvantages of the method are as follows due to adopting
With current-limiting resistance, so that most of energy all consumes on current-limiting resistance.But since the advantages of this method is that control is simple, holds
It easily realizes, therefore is still widely used in quick-wire-moving linear cutting machine.
Existing quick-wire-moving linear cutting machine has resistance pulse power workpiece generally to have with molybdenum filament clearance discharge condition detection method:
Crest voltage detection method, gap average voltage detection method, high fdrequency component detection method, breakdown delay method etc., wherein crest voltage is examined
Survey method is a kind of method commonly used at present, and mainly its real-time is good.Crest voltage detection method is exactly to utilize single pulse
The crest voltage of electric discharge is distinguished to distinguish different discharge conditions, and detection foundation is exactly line cutting processing intermediate gap electricity
Pressure can be divided into three kinds of states:
Normal clearance discharge condition, workpiece are normally cut；
Invalid clearance discharge condition, is equivalent to open-circuit condition at this time, and workpiece cannot be cut；
Harmful clearance discharge condition including unstable arc discharge condition, stablizes arc discharge state, short-circuit shape
State, wherein short-circuit condition endangers larger, fracture of wire easy to form, and unstable arc discharge condition stablizes the harm of arc discharge state
It is relatively small.
The method for distinguishing these three states is mainly: according to statistical data, when general normal process between workpiece and molybdenum filament
Gap voltage between 20V~40V, corresponding threshold voltage is respectively set, according to the detected value of actual gap voltage to adding
Work state is judged, when being judged as open-circuit condition, shows that this gap discharge process has terminated, and stepper motor movement makes work
Part is discharged to close to the movement of molybdenum filament direction with being formed next time.When being judged as short-circuit condition, stepper motor movement make workpiece to
It is mobile to cut off discharge channel far from molybdenum filament direction.When normal clearance electric discharge, stepper motor is failure to actuate.
But since gap discharge process is extremely complex, it is difficult have a constant gap voltage threshold value by these three processes
It is distinguished completely, due to the presence of the big capacity electrolyte capacitor in the pulse power, even if workpiece and molybdenum filament short circuit duration gap electricity
Pressure is also impossible to drop to small value in moment, or even gap voltage value is also possible to enter normal process gap voltage value model at this time
In enclosing, this is also the major defect of crest voltage detection method.
Fig. 1 is that wire cutting machine tool has resistance pulse power working method schematic diagram.High-frequency direct-current positive voltage terminal P100 passes through work
Part, molybdenum filament, current divider FLQ, jumper CB1, current-limiting resistance R1~R9, current-limiting resistance on-off switch S1~S9 to high-frequency DC
Pressure negative terminal G100 is formed into a loop, setting when wherein jumper CB1 illustrates for the utility model subsequent schedule, without work in normal circuit
The end A, B between part and molybdenum filament is gap voltage sampling end, send the metering display of panel D.C. voltmeter, workpiece and molybdenum filament gap-like
The sampling end of the crest voltage detection method of state is also the end A, B.The B of current divider FLQ, C-terminal are gap current sampling end, send panel straight
The metering display of galvanic electricity flow table.
Fig. 2 is three kinds of status diagrams of linear cutter gap discharge.Gap voltage can be divided into three kinds of states: (1) just
Normal clearance discharge condition, i.e. in Fig. 2 between voltage U2~U1, U=(U1+U2)/2 in Fig. 2；(2) invalid clearance discharge condition, i.e.,
Voltage U1 above section, is equivalent to open-circuit condition at this time in Fig. 2；(3) harmful clearance discharge condition, i.e. voltage U2 or less in Fig. 2
Part, including unstable arc discharge condition, stablize arc discharge state, short-circuit condition, wherein short-circuit condition harm compared with
Greatly, fracture of wire easy to form, unstable arc discharge condition, stable arc discharge state harm are relatively small.When linear cutter,
Machining state is judged according to the detected value of actual gap voltage, when being judged as open-circuit condition, shows that this gap is put
Electric process has terminated, and stepper motor movement makes workpiece discharge next time to close to the movement of molybdenum filament direction to be formed.It is short when being judged as
When line state, stepper motor movement keeps workpiece mobile to cut off discharge channel to separate molybdenum filament direction.When normal clearance electric discharge,
Stepper motor is failure to actuate.
In existing patent document, such as Chinese patent, application No. is 201610559510, patent name is a kind of wire cutting machine
Bed control system；A kind of crest voltage detection method is proposed, and common in quick-wire-moving linear cutting machine control system at present
A kind of crest voltage detection method, Fig. 2, i.e. Fig. 3 in this case in patent document.
The working principle of this method are as follows: gap voltage is sampled, short circuit is removed by zener diode 2V2~2V4
When gap voltage, the effect of resistance 2R1 is that stabilizing circuit is used, and capacitor 2C1 is filter capacitor, to filter out the height in gap voltage
Frequency ingredient, rectifier diode 2V5 are counnter attack diode, to guarantee that capacitor 2C1 does not carry out back discharge to resistance 2R1.Pressure stabilizing two
Pole pipe 2V5 plays pressure limiting.Single-pole double-throw switch (SPDT) between emulation mode and auto state to switch over.Capacitor 2C1, electricity
Resistance 2R2, potentiometer 2R4, resistance 2R5, which form to inhale, puts back to road, to form gap voltage peak that is relatively stable, filtering out high-frequency impulse
Value, wherein potentiometer 2R4 is mainly used for adjusting the sampling value of inter-train pause Voltage Peak, makes the voltage controlled oscillation of phaselocked loop 2D1 below
The frequency output signal of 4 foot of device output end preferably reflects actual gap voltage, to improve cutting efficiency and process
Stability.The in-phase amplification circuit that gap voltage peak value after filtering out high-frequency impulse is formed through triode 2V7 send phaselocked loop 2D1's
9 foot of voltage controlled oscillator input terminal.The filters internal of phaselocked loop, voltage controlled oscillator part is only utilized in this circuit, into one
Step filters out the radio-frequency component in input voltage, and is converted to corresponding frequency output signal and single-chip microcontroller is sent to be handled.Single-chip microcontroller
Gap voltage value can be extrapolated according to the frequency of input signal, and determines the movement of control stepper motor accordingly.
The gap voltage of gap voltage detection circuit energy real-time monitoring pulse shown in Fig. 3, but there is also following deficiencies:
(1) sampling end and follow-up signal processing part are without carrying out electrical isolation in the circuit, so that the radio-frequency component in discharge voltage
Subsequent processing section is formed and is interfered, False Rate is increased.(2) since gap discharge process is extremely complex, it is difficult have a perseverance
Fixed gap voltage threshold value is distinguished these three processes completely, due to depositing for the big capacity electrolyte capacitor in the pulse power
Even if workpiece and molybdenum filament short circuit duration gap voltage are also impossible to drop to small value in moment, or even gap voltage value at this time
It is also possible to enter within the scope of normal process gap voltage value, as shown in Figure 4.
Utility model content
The utility model a kind of judges that accurate, compact-sized, stable one kind has resistance in view of the above problems, providing
Pulse power wire cutting gap state detection circuit.
The technical solution of the utility model is: high-frequency direct-current positive voltage terminal P100 by workpiece, molybdenum filament, current divider FLQ, across
Wiring CB1, current-limiting resistance R1~R9, current-limiting resistance on-off switch S1~S9 to high frequency DC voltage negative terminal G100 forming circuit,
It is equipped with the connecting pin A between the high-frequency direct-current positive voltage terminal and workpiece, is equipped between the molybdenum filament and current divider FLQ
The connecting pin B;The connecting pin A and the connecting pin B form gap voltage sampling end；The gap voltage sampling end, which is equipped with, successively to be connected
The Voltage stabilizing module that connects integrates module, voltage follow module, phaselocked loop U1, optocoupler OP2 and single-chip microcontroller；
The first pin of the optocoupler OP2 by resistance R12 respectively with the 3rd pin of the phaselocked loop U1 and the locking phase
The 4th pin of ring U1 connects；The second pin of the optocoupler OP2 is grounded, and the 4th pin of the optocoupler OP2 passes through resistance R16
It connects to power supply；The single-chip microcontroller is connect with the 4th pin of optocoupler OP2；The third pin of the optocoupler OP2 is grounded；
The 5th pin of the phaselocked loop U1 is grounded；
Capacitor C1 is equipped between the 6th pin of the phaselocked loop U1 and the 7th pin of the phaselocked loop U1；The capacitor C1
One end connect with the 6th pin of phaselocked loop U1, the other end of the capacitor C1 is connect with the 7th pin of phaselocked loop U1；
The 5th pin of the phaselocked loop U1 and the 8th pin of phaselocked loop U1 are grounded respectively；
The 9th pin of the phaselocked loop U1 is connect with voltage follow module；
The 11st pin of the phaselocked loop U1 is grounded by resistance R11；
The 12nd pin of the phaselocked loop U1 is connected to power supply by resistance R10；
The 16th pin of the phaselocked loop U1 connects to power supply.
The Voltage stabilizing module include zener diode V0, zener diode V1, zener diode V2, counnter attack diode V3 and
Resistance R13；
The cathode connecting pin of the zener diode V0 is connect with the connecting pin A, the anode connection of the zener diode V0
End is connect with the cathode connecting pin of the zener diode V1；The anode connection terminal and zener diode of the zener diode V1
The cathode connecting pin of V2 connects, the anode connection terminal of the anode connection terminal of the zener diode V2 and the counnter attack diode V3
Connection；The cathode connecting pin of the counnter attack diode V3 is connect with module is integrated；
The input terminal of the resistance R13 is connected between zener diode V2 and counnter attack diode V3, the resistance R13's
Output end is connect with the connecting pin B；
On the zener diode V0 and it is connected to jumper JP1；On zener diode V1 and it is connected to jumper JP2.
The cathode connecting pin of the counnter attack diode V3 and integrate between module be equipped with resistance R0, the resistance R0 and counnter attack
Diode V3 series connection.
It is described integrate module include capacitor C2, resistance R14, resistance R15, resistance R16, zener diode V6, optocoupler OP1 and
Single-pole double-throw switch (SPDT)；
The cathode connecting pin of the counnter attack diode V3 passes sequentially through resistance R14 and resistance R16 and draws with the 1st of optocoupler OP1
Foot connection；
The input terminal of the capacitor C2 is connected between the counnter attack diode V3 and resistance R14, and the capacitor C2's is defeated
Outlet is connect with the connecting pin B；
The input terminal of the resistance R15 and zener diode V6 be connected in turn respectively the resistance R14 and resistance R16 it
Between；The output end of the resistance R15 and zener diode V6 is connect with the connecting pin B respectively；
The 2nd pin of the optocoupler OP1 is connect with the connecting pin B；The 4th pin of the optocoupler OP1 passes through resistance R19 and electricity
Source connection；The 3rd pin of the optocoupler OP1 and the 3rd connecting pin of single-pole double-throw switch (SPDT) connect；The of the single-pole double-throw switch (SPDT)
1 connecting pin is connected on the 4th pin of the optocoupler OP1；So the 2nd connecting pin of single-pole double-throw switch (SPDT) and voltage follow module
Connection.
The optocoupler OP1 is linear optical coupling PC817.
The voltage follow module includes potentiometer DWQ1, resistance R17, capacitor C3, triode Q1 and resistance R18；
The first pin of the potentiometer DWQ1 and the 2nd connecting pin of single-pole double-throw switch (SPDT) connect；The potentiometer DWQ1
Second pin be grounded by resistance R17；The third pin of the potentiometer DWQ1 respectively with the input terminal of capacitor C3 and three poles
The connecting pin B of pipe Q1 connects；The output end of the capacitor C3 is grounded；The C connection termination power of the triode Q1, three pole
The connecting pin E of pipe Q1 is grounded by resistance R18；
The 9th pin of the phaselocked loop U1 is connected between the potentiometer DWQ1 and resistance R18.
The connecting pin C is equipped between the CB1；The connecting pin D is equipped between the jumper CB1 and current-limiting resistance R1~R9；
Gap current detection circuit module is equipped between the connecting pin C and the connecting pin D；
The gap current detection circuit module include current sensor chip U2, resistance R21, capacitor C1, comparator U3,
Resistance R24, zener diode V7, resistance R22, resistance R23 and potentiometer DWQ2；
The positive input terminal of the current sensor chip U2 is connect with the connecting pin C；The current sensor chip U2's is negative
Input terminal is connect with the connecting pin D；The 1 connection termination power of the current sensor chip U2；The current sensor chip U2
2 connecting pins ground connection；3 connecting pins of the current sensor chip U2 are connect through resistance R21 with the second pin of comparator U3；
The third pin of the comparator U3 is connect with three connecting pins of potentiometer DWQ2；The first pin frequency of the comparator U3 is defeated
Out；
The comparator U33 is connected to power supply by resistance R22；
The capacitor C1 input terminal is connected between resistance 21 and comparator U3；The output end of the capacitor is grounded；
The cathode connecting pin of the zener diode V7 is connected between potentiometer DWQ2 and comparator U3；The pressure stabilizing two
The anode connection terminal of pole pipe V7 is grounded；
Two connecting pins of the potentiometer DWQ2 are grounded through resistance R23；A connecting pin of the potentiometer DWQ2 is through resistance
R22 is connected to power supply.
The filters internal of phaselocked loop, voltage controlled oscillator part is utilized in the utility model, to further filter out input
Radio-frequency component in voltage, and convert input voltage into corresponding frequency output signal and given at single-chip microcontroller through optocoupler OP2
Reason.Single-chip microcontroller can extrapolate gap voltage value according to the frequency of input signal, and determine the movement of control stepper motor accordingly.
Resistance R0 is accessed between the cathode and capacitor C2 and resistance R14 of counnter attack diode V3, the charging time is increased, to the gap of input
Voltage is filtered averagely, is reduced gap voltage under short-circuit condition and is entered section set by gap voltage under normal process state
Interior probability is further conducive to be separated gap voltage under normal process state and gap voltage under short-circuit condition.This
Utility model has the characteristics that judge accurate, compact-sized, stable.
It proposes a kind of appropriate sensitivity for reducing gap voltage sampling, is assisted at the same time using gap current detection
The method of judgement,
Detailed description of the invention
Fig. 1 is that wire cutting machine tool has resistance pulse power working method schematic diagram；
Fig. 2 is three kinds of status diagrams of linear cutter gap discharge；
Fig. 3 is a kind of crest voltage detection method schematic diagram in the prior art；
Fig. 4 is gap voltage test result figure under regular picture and short-circuit condition；
Fig. 5 is a kind of gap voltage detection circuit figure of the utility model；
Fig. 6 is a kind of reduction gap voltage detection sensitivity circuit of the utility model；
Fig. 7 is a kind of gap current detection circuit of the utility model.
Specific embodiment
The utility model as shown in figs. 1-7, there is resistance pulse power wire cutting clearance discharge condition detection circuit, high-frequency direct-current
Positive voltage terminal P100 passes through workpiece, molybdenum filament, current divider FLQ, jumper CB1, current-limiting resistance R1~R9, current-limiting resistance on-off switch
S1~S9 to high frequency DC voltage negative terminal G100 forming circuit,
It is equipped with the connecting pin A between the high-frequency direct-current positive voltage terminal and workpiece, is equipped between the molybdenum filament and current divider FLQ
The connecting pin B;The connecting pin A and the connecting pin B form gap voltage sampling end；The gap voltage sampling end, which is equipped with, successively to be connected
The Voltage stabilizing module that connects integrates module, voltage follow module, phaselocked loop U1, optocoupler OP2 and single-chip microcontroller；
The first pin of the optocoupler OP2 by resistance R12 respectively with the 3rd pin of the phaselocked loop U1 and the locking phase
The 4th pin of ring U1 connects；The second pin of the optocoupler OP2 is grounded, and the 4th pin of the optocoupler OP2 passes through resistance R16
It connects to power supply；The single-chip microcontroller is connect with the 4th pin of optocoupler OP2；The third pin of the optocoupler OP2 is grounded；
The 5th pin of the phaselocked loop U1 is grounded；
Capacitor C1 is equipped between the 6th pin of the phaselocked loop U1 and the 7th pin of the phaselocked loop U1；The capacitor C1
One end connect with the 6th pin of phaselocked loop U1, the other end of the capacitor C1 is connect with the 7th pin of phaselocked loop U1；
The 5th pin of the phaselocked loop U1 and the 8th pin of phaselocked loop U1 are grounded respectively；
The 9th pin of the phaselocked loop U1 is connect with voltage follow module；
The 11st pin of the phaselocked loop U1 is grounded by resistance R11；
The 12nd pin of the phaselocked loop U1 is connected to power supply by resistance R10；
The 16th pin of the phaselocked loop U1 connects to power supply.
The Voltage stabilizing module include zener diode V0, zener diode V1, zener diode V2, counnter attack diode V3 and
Resistance R13；
The cathode connecting pin of the zener diode V0 is connect with the connecting pin A, the anode connection of the zener diode V0
End is connect with the cathode connecting pin of the zener diode V1；The anode connection terminal and zener diode of the zener diode V1
The cathode connecting pin of V2 connects, the anode connection terminal of the anode connection terminal of the zener diode V2 and the counnter attack diode V3
Connection；The cathode connecting pin of the counnter attack diode V3 is connect with module is integrated；
The input terminal of the resistance R13 is connected between zener diode V2 and counnter attack diode V3, the resistance R13's
Output end is connect with the connecting pin B；
On the zener diode V0 and it is connected to jumper JP1；On zener diode V1 and it is connected to jumper JP2.
It is described integrate module include capacitor C2, resistance R14, resistance R15, resistance R16, zener diode V6, optocoupler OP1 and
Single-pole double-throw switch (SPDT)；
The cathode connecting pin of the counnter attack diode V3 passes sequentially through resistance R14 and resistance R16 and draws with the 1st of optocoupler OP1
Foot connection；
The input terminal of the capacitor C2 is connected between the counnter attack diode V3 and resistance R14, and the capacitor C2's is defeated
Outlet is connect with the connecting pin B；
The input terminal of the resistance R15 and zener diode V6 be connected in turn respectively the resistance R14 and resistance R16 it
Between；The output end of the resistance R15 and zener diode V6 is connect with the connecting pin B respectively；
The 2nd pin of the optocoupler OP1 is connect with the connecting pin B；The 4th pin of the optocoupler OP1 passes through resistance R19 and electricity
Source connection；The 3rd pin of the optocoupler OP1 and the 3rd connecting pin of single-pole double-throw switch (SPDT) connect；The of the single-pole double-throw switch (SPDT)
1 connecting pin is connected on the 4th pin of the optocoupler OP1；So the 2nd connecting pin of single-pole double-throw switch (SPDT) and voltage follow module
Connection.As shown in figure 5, closure is emulation mode on single-pole double-throw switch (SPDT), lower closure is automatic mode.
The optocoupler OP1 is linear optical coupling PC817.
The voltage follow module includes potentiometer DWQ1, resistance R17, capacitor C3, triode Q1 and resistance R18；
The first pin of the potentiometer DWQ1 and the 2nd connecting pin of single-pole double-throw switch (SPDT) connect；The potentiometer DWQ1
Second pin be grounded by resistance R17；The third pin of the potentiometer DWQ1 respectively with the input terminal of capacitor C3 and three poles
The connecting pin B of pipe Q1 connects；The output end of the capacitor C3 is grounded；The C connection termination power of the triode Q1, three pole
The connecting pin E of pipe Q1 is grounded by resistance R18；
The 9th pin of the phaselocked loop U1 is connected between the potentiometer DWQ1 and resistance R18.
In Fig. 5, the pressure stabilizing value of zener diode V0, V1, V2 are respectively 3.9V, 6.2V and 18V, and the sum of maximum pressure stabilizing value is
28.1V, minimum pressure stabilizing value are 18V.Zener diode V0, V1 respectively and are connected to jumper, so as to according to specific lathe and processing
Workpiece situation carries out appropriately combined.Resistance R13 has the function of stabilizing circuit, and capacitor C2 is filter capacitor, to filter out gap
Radio-frequency component in voltage, rectifier diode V3 is counnter attack diode, to guarantee that capacitor C2 is not put resistance R13 reversely
Electricity.Zener diode V6 plays pressure limiting.Single-pole double-throw switch (SPDT) between emulation mode and auto state to switch over.Electricity
Appearance C2, resistance R14, resistance R15, which form to inhale, puts back to road, to form gap voltage peak value that is relatively stable, filtering out high-frequency impulse.
Capacitor C2, resistance R14, the value of resistance R15 are critically important in Fig. 5, and the parameter such as chosen causes circuit discharging time constant too long,
Then peak value gap voltage detection method is changed for gap voltage detection method, reduces real-time.Resistance R16 is optocoupler
The current-limiting resistance of OP1 input terminal.Optocoupler OP1 uses linear optical coupling PC817, rather than common pulse optocoupler, so as to normal
Optocoupler output can accurately reflect the gap voltage of input under discharge condition.Potentiometer DWQ1 is mainly used for adjusting inter-train pause electricity
The sampling value of voltage crest makes the frequency output signal of 4 foot of voltage controlled oscillator output end of phaselocked loop U1 below preferably reflect reality
Gap voltage, to improve the stability of cutting efficiency and process.Gap voltage peak value after filtering out high-frequency impulse is through electricity
The voltage follower circuit for holding C3 filtering, triode Q1 and resistance R18 composition send 9 foot of voltage controlled oscillator input terminal of phaselocked loop U1.
Capacitor C1 is oscillating capacitance, and resistance R10 and R11 are oscillation resistance.This circuit be equally only utilized phaselocked loop filters internal,
Voltage controlled oscillator part to further filter out the radio-frequency component in input voltage, and converts input voltage into corresponding frequency
Rate output signal send single-chip microcontroller to be handled through optocoupler OP2.Single-chip microcontroller can extrapolate gap electricity according to the frequency of input signal
Pressure value, and the movement of control stepper motor is determined accordingly.
Although peak value gap voltage detection circuit shown in fig. 5 solves first deficiency of circuit shown in Fig. 3, but same
Deposit second deficiency of circuit shown in Fig. 3.On the basis of the utility model peak value gap voltage detection circuit shown in Fig. 5,
It is proposed a kind of appropriate sensitivity for reducing gap voltage sampling, i.e., it is average to the appropriate filtering of sampled voltage progress, it will normally put
Electric gap voltage is distinguished with short-circuit condition gap voltage, carries out the side of auxiliary judgment using gap current detection at the same time
Method makes workpiece be detached from molybdenum filament as early as possible, has well solved this problem, as shown in Figure 6 when short circuit occur.
The cathode connecting pin of the counnter attack diode V3 and integrate between module be equipped with resistance R0 (Fig. 6 dotted box portion, this
The differentiation to module in figure is simply facilitated using dotted line frame mark in case), the resistance R0 connects with counnter attack diode V3.
Relative to gap voltage detection circuit shown in fig. 5, in the cathode of counnter attack diode V3 and capacitor C2 and electricity in Fig. 6
It hinders and accesses resistance R0 between R14, can thus increase the charging time, average, reduction Fig. 4 is filtered to the gap voltage of input
Gap voltage enters the probability under normal process state in section set by gap voltage under middle short-circuit condition, further advantageous
It is separated in by gap voltage under normal process state and gap voltage under short-circuit condition, therefore can two pole of appropriate local pressure stabilizing
The combination pressure stabilizing value of pipe V0~V3.
The detection performance of circuit shown in Fig. 6 is premised on sacrificing and reduce the probability accurately identified to short-circuit condition
's.And short-circuit condition endangers larger, fracture of wire easy to form, it is therefore necessary to increase the current detection circuit of detection short-circuit condition.
The connecting pin C is equipped between the CB1；The connecting pin D is equipped between the jumper CB1 and current-limiting resistance R1~R9；
Gap current detection circuit module is equipped between the connecting pin C and the connecting pin D；
The gap current detection circuit module include current sensor chip U2, resistance R21, capacitor C1, comparator U3,
Resistance R24, zener diode V7, resistance R22, resistance R23 and potentiometer DWQ2；
The positive input terminal of the current sensor chip U2 is connect with the connecting pin C；The current sensor chip U2's is negative
Input terminal is connect with the connecting pin D；The 1 connection termination power of the current sensor chip U2；The current sensor chip U2
2 connecting pins ground connection；3 connecting pins of the current sensor chip U2 are connect through resistance R21 with the second pin of comparator U3；
The third pin of the comparator U3 is connect with three connecting pins of potentiometer DWQ2；The first pin frequency of the comparator U3 is defeated
Out, it is connected to the 4th pin of phaselocked loop U1, is connected to MCU through optocoupler OP2.
The comparator U33 is connected to power supply by resistance R22；
The capacitor C1 input terminal is connected between resistance 21 and comparator U3；The output end of the capacitor is grounded；
The cathode connecting pin of the zener diode V7 is connected between potentiometer DWQ2 and comparator U3；The pressure stabilizing two
The anode connection terminal of pole pipe V7 is grounded；
Two connecting pins of the potentiometer DWQ2 are grounded through resistance R23；A connecting pin of the potentiometer DWQ2 is through resistance
R22 is connected to power supply.
The utility model proposes a kind of wire cutting machine tool control system gap current detection circuits, as shown in Figure 7.Using
Linear current sensing IC chip ACS750xCA, the current sensor can detect DC current and alternating current, current sensor core
The output voltage of piece ACS750xCA is 19.75mV/A, and the linearity is fine in -75A~75A current range.The utility model
In, it is by the C-terminal of jumper CB1 in the positive input terminal map interlinking 1 of current sensor chip U2, bearing for current sensor chip U2 is defeated
The end D for entering to terminate jumper CB1 in Fig. 1, can be acquired gap current.Wire cutting machine tool has the work of the resistance pulse power
Voltage is generally 100V, and the minimum value of current-limiting resistance is generally 10/9=1.11 Ω, therefore current maxima is under its short-circuit condition
100/1.11=90A.In fact, in circuit there are due to field-effect tube conducting resistance etc., current maxima under short-circuit condition
Generally 75A or so.The utility model devises reference voltage base circuit accordingly.The input current of current sensor chip is
When 75A, output voltage is 75 × 19.75=1481.25mV=1.5V.When the input current of current sensor chip is 90A,
Output voltage is 90 × 19.75=1777.5mV=1.8V.Therefore, zener diode V7 selects 1N4614 in Fig. 7, and pressure stabilizing value is
1.8V.Resistance R22 value is 470 Ω in Fig. 7, and resistance R23 value is 120 Ω, and potentiometer DWQ selects the line of 0~150 Ω range
Property potentiometer.When potentiometer is located at 150 Ω, the non-inverting input terminal input voltage of comparator U3 are as follows: 5 × (120+150)/(120
+150+470)=1.82V.Therefore, which fully meets the current detecting between 75A~90A, and user can be as the case may be
It is adjusted.When detecting short circuit current thresholding of the electric current more than setting, comparator U3 overturning, comparator exports low level, Fig. 5
Middle optocoupler OP2 input terminal is low level, then optocoupler OP2 output end is high level, and high level signal is sent into single-chip microprocessor MCU, and MCU is
It is judged as short-circuit condition, and then controls stepper motor, keeps workpiece mobile to cut off discharge channel to separate molybdenum filament direction.
Claims (7)
1. there is resistance pulse power wire cutting clearance discharge condition detection circuit, the anode P100 of high-frequency direct-current voltage by workpiece,
Molybdenum filament, current divider FLQ, jumper CB1, current-limiting resistance R1~R9, current-limiting resistance on-off switch S1~S9 to high frequency DC voltage
Negative terminal G100 forming circuit, which is characterized in that
It is equipped with the connecting pin A between the high-frequency direct-current positive voltage terminal and workpiece, B is equipped between the molybdenum filament and current divider FLQ and is connected
Connect end;The connecting pin A and the connecting pin B form gap voltage sampling end；The gap voltage sampling end is equipped with and is sequentially connected
Voltage stabilizing module, integrate module, voltage follow module, phaselocked loop U1, optocoupler OP2 and single-chip microcontroller；
The first pin of the optocoupler OP2 by resistance R12 respectively with the 3rd pin and the phaselocked loop U1 of the phaselocked loop U1
The 4th pin connection；The second pin of the optocoupler OP2 is grounded, and the 4th pin of the optocoupler OP2 passes through resistance R16 and electricity
Source connection；The single-chip microcontroller is connect with the 4th pin of optocoupler OP2；The third pin of the optocoupler OP2 is grounded；
The 5th pin of the phaselocked loop U1 is grounded；
Capacitor C1 is equipped between the 6th pin of the phaselocked loop U1 and the 7th pin of the phaselocked loop U1；The one of the capacitor C1
End is connect with the 6th pin of phaselocked loop U1, and the other end of the capacitor C1 is connect with the 7th pin of phaselocked loop U1；
The 5th pin of the phaselocked loop U1 and the 8th pin of phaselocked loop U1 are grounded respectively；
The 9th pin of the phaselocked loop U1 is connect with voltage follow module；
The 11st pin of the phaselocked loop U1 is grounded by resistance R11；
The 12nd pin of the phaselocked loop U1 is connected to power supply by resistance R10；
The 16th pin of the phaselocked loop U1 connects to power supply.
2. according to claim 1 have resistance pulse power wire cutting clearance discharge condition detection circuit, which is characterized in that institute
Stating Voltage stabilizing module includes zener diode V0, zener diode V1, zener diode V2, counnter attack diode V3 and resistance R13；
The cathode connecting pin of the zener diode V0 is connect with the connecting pin A, the anode connection terminal of the zener diode V0 with
The cathode connecting pin of the zener diode V1 connects；The anode connection terminal of the zener diode V1 is with zener diode V2's
The anode connection terminal of the connection of cathode connecting pin, the anode connection terminal of the zener diode V2 and the counnter attack diode V3 connect
It connects；The cathode connecting pin of the counnter attack diode V3 is connect with module is integrated；
The input terminal of the resistance R13 is connected between zener diode V2 and counnter attack diode V3, the output of the resistance R13
End is connect with the connecting pin B；
On the zener diode V0 and it is connected to jumper JP1；On zener diode V1 and it is connected to jumper JP2.
3. according to claim 2 have resistance pulse power wire cutting clearance discharge condition detection circuit, which is characterized in that institute
It states the cathode connecting pin of counnter attack diode V3 and integrates and be equipped with resistance R0, the resistance R0 and counnter attack diode V3 string between module
Connection.
4. according to claim 2 have resistance pulse power wire cutting clearance discharge condition detection circuit, which is characterized in that institute
Stating and integrating module includes that capacitor C2, resistance R14, resistance R15, resistance R16, zener diode V6, optocoupler OP1 and single-pole double throw are opened
It closes；
The 1st pin that the cathode connecting pin of the counnter attack diode V3 passes sequentially through resistance R14 and resistance R16 and optocoupler OP1 connects
It connects；
The input terminal of the capacitor C2 is connected between the counnter attack diode V3 and resistance R14, the output end of the capacitor C2
It is connect with the connecting pin B；
The input terminal of the resistance R15 and zener diode V6 is connected in turn respectively between the resistance R14 and resistance R16；
The output end of the resistance R15 and zener diode V6 is connect with the connecting pin B respectively；
The 2nd pin of the optocoupler OP1 is connect with the connecting pin B；The 4th pin of the optocoupler OP1 is connected by resistance R19 and power supply
It connects；The 3rd pin of the optocoupler OP1 and the 3rd connecting pin of single-pole double-throw switch (SPDT) connect；The 1st of the single-pole double-throw switch (SPDT) connects
End is connect to be connected on the 4th pin of the optocoupler OP1；So the 2nd connecting pin of single-pole double-throw switch (SPDT) and voltage follow module connect
It connects.
5. according to claim 4 have resistance pulse power wire cutting clearance discharge condition detection circuit, which is characterized in that institute
Stating optocoupler OP1 is linear optical coupling PC817.
6. according to claim 1 have resistance pulse power wire cutting clearance discharge condition detection circuit, which is characterized in that institute
Stating voltage follow module includes potentiometer DWQ1, resistance R17, capacitor C3, triode Q1 and resistance R18；
The first pin of the potentiometer DWQ1 and the 2nd connecting pin of single-pole double-throw switch (SPDT) connect；The of the potentiometer DWQ1
Two pins are grounded by resistance R17；The third pin of the potentiometer DWQ1 respectively with the input terminal of capacitor C3 and triode Q1
The connecting pin B connection；The output end of the capacitor C3 is grounded；The C connection termination power of the triode Q1, the triode Q1
The connecting pin E be grounded by resistance R18；
The 9th pin of the phaselocked loop U1 is connected between the potentiometer DWQ1 and resistance R18.
7. according to claim 1 have resistance pulse power wire cutting clearance discharge condition detection circuit, which is characterized in that institute
It states and is equipped with the connecting pin C between CB1；The connecting pin D is equipped between the jumper CB1 and current-limiting resistance R1~R9；The connecting pin C
Gap current detection circuit module is equipped between the connecting pin D；
The gap current detection circuit module includes current sensor chip U2, resistance R21, capacitor C1, comparator U3, resistance
R24, zener diode V7, resistance R22, resistance R23 and potentiometer DWQ2；
The positive input terminal of the current sensor chip U2 is connect with the connecting pin C；The negative input of the current sensor chip U2
End is connect with the connecting pin D；The 1 connection termination power of the current sensor chip U2；The 2 of the current sensor chip U2 connect
Connect end ground connection；3 connecting pins of the current sensor chip U2 are connect through resistance R21 with the second pin of comparator U3；It is described
The third pin of comparator U3 is connect with three connecting pins of potentiometer DWQ2；The first pin rate-adaptive pacemaker of the comparator U3；
The comparator U33 is connected to power supply by resistance R22；
The capacitor C1 input terminal is connected between resistance 21 and comparator U3；The output end of the capacitor is grounded；
The cathode connecting pin of the zener diode V7 is connected between potentiometer DWQ2 and comparator U3；The zener diode
The anode connection terminal of V7 is grounded；
Two connecting pins of the potentiometer DWQ2 are grounded through resistance R23；A connecting pin of the potentiometer DWQ2 through resistance R22 with
Power supply connection.
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| CN201820893612.1U CN208297691U (en) | 2018-06-11 | 2018-06-11 | There is resistance pulse power wire cutting clearance discharge condition detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108919139A (en) * | 2018-06-11 | 2018-11-30 | 扬州万泰电子科技有限公司 | One kind having resistance pulse power wire cutting clearance discharge condition detection circuit |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108919139A (en) * | 2018-06-11 | 2018-11-30 | 扬州万泰电子科技有限公司 | One kind having resistance pulse power wire cutting clearance discharge condition detection circuit |
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