CN106735800A - A kind of CUT arc maintenance electronics current-limiting resistance circuit - Google Patents
A kind of CUT arc maintenance electronics current-limiting resistance circuit Download PDFInfo
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- CN106735800A CN106735800A CN201710159101.7A CN201710159101A CN106735800A CN 106735800 A CN106735800 A CN 106735800A CN 201710159101 A CN201710159101 A CN 201710159101A CN 106735800 A CN106735800 A CN 106735800A
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- 238000012423 maintenance Methods 0.000 title claims abstract description 56
- 238000001914 filtration Methods 0.000 claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 17
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- 230000005669 field effect Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 description 6
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- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
Abstract
The invention discloses a kind of CUT arc maintenance electronics current-limiting resistance circuit, including current rectifying and wave filtering circuit, filtering output circuit, also including auxiliary power circuit, frequency configuration circuit, current-limiting circuit, FET Q1, integrated chip U2, the first current sampling circuit, the first filter circuit, freewheeling circuit.The present invention can well substitute relay of the prior art and inefficient current-limiting resistance, so that the circuit after replacing is more reliable and more stable, reduce the loss in circuit running, and lift the operating efficiency of arc maintenance, and simple structure of the present invention, firmly, component low cost, is easy to safeguard and overhauls.
Description
Technical field
The present invention relates to Power Electronic Technique circuit topological structure and welding, cutting power supply, more particularly to a kind of plasma
Cutting machine arc maintenance electronics current-limiting resistance circuit.
Background technology
Plasma Are Cutting Machine is a kind of machinery being processed to metal material by plasma cutting technique.Plasma
Arc-maintaining device in cutting machine, can guarantee that the energy ezpenditure for declining low CUT in non-cutting work, reduces electrode and burns
Damage, extend the service life of CUT.During arc maintenance, the arc-maintaining device of CUT can be adjusted by
The size of the stingy flow of two magnetic valves, makes during arc maintenance that more continuous, noise is small, better reliability.But, due to arc maintenance function
It is connected in parallel on nozzle typically by the power resistor and relay switch that connect in power positive end a high-power fixed resistance value
Realize, so having very big voltage, electric current in arc maintenance, on power resistor, cause power resistor to generate heat serious, easily because of mistake
Heat and damage.Therefore, in order to reduce the operating temperature of power resistor to improve its reliability, it is necessary to increase the power of power resistor
Grade simultaneously designs stronger radiating and cooling system, but this way increased the cost of arc maintenance again.Secondly, power resistor during arc maintenance
Resistance immobilize, power attenuation also immobilizes, and causes the operating efficiency of arc maintenance to only reach 50 percent, causes money
The serious waste in source.
The content of the invention
The present invention easily overheats damage etc. for arc maintenance high cost, inefficiency, power resistor present in prior art
A kind of defect, there is provided new CUT arc maintenance electronics current-limiting resistance circuit.
In order to solve the above-mentioned technical problem, the present invention is achieved through the following technical solutions：
A kind of CUT arc maintenance electronics current-limiting resistance circuit, including current rectifying and wave filtering circuit, filtering output circuit, it is described
The two ends of current rectifying and wave filtering circuit are connected with OUT+ ends, OUT- ends respectively, the two ends of described filtering output circuit respectively with QDH
End, OUT- ends connection, also including auxiliary power circuit, frequency configuration circuit, current-limiting circuit, FET Q1, integrated chip U2,
First current sampling circuit, the first filter circuit, freewheeling circuit, described FET Q1 include three tunnels, and described is integrated
The OUT terminal of chip U2 is connected by current-limiting circuit with the first via of FET Q1, described current rectifying and wave filtering circuit and field-effect
The second tunnel connection of pipe Q1, the SEN ends of described integrated chip U2 are by the first filter circuit all the way with the of integrated chip U2
Three tunnels connect, and separately lead up to the connection of the first current sampling circuit, freewheeling circuit and QDH ends, described frequency configuration circuit point
RT/CT ends, GND ends not with integrated chip U2, VREF ends are connected, the VCC of described auxiliary power circuit and integrated chip U2
End connection.
OUT+ ends and OUT- ends are connected respectively to the output cathode and negative pole of CUT, QDH ends, OUT- ends
It is the positive pole and negative pole of arc maintenance electronics current-limiting resistance circuit output.The voltage of input can be carried out rectification filter by current rectifying and wave filtering circuit
As the dc bus power supply of arc maintenance electronics current-limiting resistance circuit after ripple, auxiliary power circuit can provide electricity for integrated chip U2
Source so that integrated chip U2 energization work, integrated chip U2 is a kind of fixed frequency current mode controller, frequency configuration circuit
Fixed frequency for configuring integrated chip U2, the OUT terminal of integrated chip U2 is control signal output, the electric current warp of its output
It is used to control turning on and off for FET Q1 after crossing current-limiting circuit current limliting.When FET Q1 is opened, input voltage warp
By output after FET Q1, the first current sampling circuit, freewheeling circuit to QDH ends after over commutation filter circuit, the first electricity
The SEN ends of integrated chip U2 are sent to after stream sample circuit is sampled to electric current and after the first current sampling circuit is filtered,
After electric current exceedes the threshold values at the SEN ends of integrated chip U2, the OUT terminal of integrated chip U2 closes output current so that field
Effect pipe Q1 turn off, and freewheeling circuit can scene effect pipe Q1 be turned off after to output carry out afterflow, it is ensured that the stabilization of output
Property.By above structure, stability during arc maintenance can either be ensured, power attenuation during arc maintenance can be reduced again, lift arc maintenance
Operating efficiency, and extra radiating and cooling system need not be equipped with, reduce production cost.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, the rectifying and wave-filtering
Circuit includes power diode D3, electric capacity C1, electric capacity C9, electric capacity C10, electric capacity C6, described electric capacity C1, electric capacity C9, electric capacity
One end is connected with the output end of power diode D3 after C10, electric capacity C6 constitute parallel circuit, and the other end is connected with OUT- ends, institute
The input of the power diode D3 for stating is connected with OUT+ ends, and the output end of power diode D3 is also with the second of FET Q1
Road connects.
The current rectifying and wave filtering circuit being made up of above element can play more preferable filter action, circuit is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described filtering is defeated
Going out circuit includes resistance R19, R20, R21, electric capacity C7, after described resistance R19, resistance R20, resistance R21 composition series circuits
In parallel with electric capacity C7, described electric capacity C7 one end is connected with QDH ends, and the other end is connected with OUT- ends.
The filtering output circuit being made up of above element can play more preferable filter action so that the electric current of output is more
Steadily, circuit is made more to stablize.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described auxiliary electricity
Source circuit includes auxiliary power supply end YH1, diode D1, electric capacity C3, electric capacity C4, and the input of described diode D1 is supplied with auxiliary
The positive pole connection of electric end YH1, the output end of diode D1 is connected with the VCC ends of integrated chip U2, described electric capacity C3, electric capacity C4
One end is connected with the VCC ends of integrated chip U2 after constituting parallel circuit, and the other end is connected with GNDB ends.
Wherein auxiliary power supply end YH1 is used for the voltage of provided auxiliary, and is carried out by diode D1, electric capacity C3, electric capacity C4
The VCC ends of integrated chip U2 are input to after rectifying and wave-filtering so that the boost voltage of offer is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described frequency is matched somebody with somebody
Circuits include electric capacity C2, resistance R3, electric capacity C8, and described electric capacity C2 one end is connected with GNDB ends, the other end and integrated chip
The VREF ends connection of U2, described resistance R3 one end is connected with the VREF ends of integrated chip U2, and the other end is with integrated chip U2's
RT/CT ends connect, and described electric capacity C8 one end is connected with the RT/CT ends of integrated chip U2, the GND of the other end and integrated chip U2
End connection.
Wherein resistance R3, electric capacity C8 are used to set the working frequency of integrated chip U2, and electric capacity C2 is to integrated chip U2's
VREF is filtered so that the working frequency of U2 is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described current limliting electricity
Road includes resistance R8, and the first via of described FET Q1 is connected by resistance R8 with the OUT terminal of integrated chip U2.
Resistance R8 can make the electric current in circuit be unlikely to excessive, and then the preferably stability of protection circuit.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, the first described electricity
Stream sample circuit includes that resistance R9, resistance R11, described resistance R9 and resistance R11 constitute one end and field-effect after parallel circuit
The 3rd tunnel connection of pipe Q1, the other end is connected with freewheeling circuit.
There can be certain cushioning effect to electric current by above structure, it is ensured that curent change is small within a certain period of time, i.e.,
Constantly electric current is more stablized to ensure sampling.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, the first described filter
Wave circuit includes resistance R4, electric capacity C5, and described resistance R4 one end is connected with the SEN ends of integrated chip U2, the other end with it is described
FET Q1 the connection of the 3rd tunnel, described electric capacity C5 one end is connected with the SEN ends of integrated chip U2, the other end and GNDB ends
Connection.
More preferable filter action can be played by above structure, circuit is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, described afterflow electricity
Road includes power inductance L1, power diode D2, and the input of the power diode D2 is connected with OUT- ends, power diode
The output end of D2 is connected by power inductance L1 with QDH ends.
Power inductance L1 can produce induced electromotive force, when the current vanishes, its induced electricity when by electric current at its two ends
Kinetic potential can in circuit element produce backward voltage, the two ends of power inductance L1 are connected in parallel on due to power diode D2, then when
When flowing through the current vanishes of power inductance L1, the induced electromotive force that power inductance L1 is produced is by power diode D2 and power electricity
Loop acting that sense L1 is constituted and consume such that it is able to ensure other elements in the normal operation of afterflow, and protection circuit
Safety.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, also including the second electricity
Stream sample circuit, the second described current sampling circuit includes resistance R12, resistance R13, described resistance R12 and resistance R13 structures
One end is connected with power inductance L1 after into parallel circuit, and the other end is connected with the output end of power diode D2.
Preferably electric current is sampled by the way that above structure is more enough.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, also including a RC
Absorbing circuit, a described RC absorbing circuits include resistance R17, electric capacity C11, described resistance R17 and described electric capacity C11
It is in parallel with described power diode D2 after series connection.
First RC absorbing circuits are capable of the peak voltage at absorbed power diode D2 two ends, it is to avoid circuit voltage climbing mistake
Greatly, it is ensured that the safety of circuit.Wherein electric capacity C11 series resistances R17 can play damping action, and it can prevent circuit in transition
During, power diode D2 is damaged in the overvoltage that capacitor two ends occur because vibrating, while capacitor can be avoided to lead to
Overpower diode D2 discharge currents are excessive, cause overcurrent and damage power diode D2.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, also mends including slope
Repay circuit, described slope equalizer include triode Q3, resistance R5, resistance R10, the colelctor electrode c of the triode Q3 with
The VREF ends connection of described integrated chip U2, the RT/CT ends of the base stage b of the triode Q3 and integrated chip U2 connect
Connect, the emitter e of the triode Q3 is connected by the tunnels of resistance R5 mono- with the first filter circuit, separately lead up to resistance R10 with
The 3rd tunnel connection of FET Q1.
Slope equalizer effectively avoids the produced current perturbation in circular flow of circuit, it is to avoid feedback is shaken
Swing, circuit is more stablized.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, also including the 2nd RC
Absorbing circuit, the 2nd described RC absorbing circuits include resistance R14, electric capacity C15, and described resistance R14 and electric capacity C15 constitutes string
One end is connected with second tunnel of FET Q1 after connection circuit, and the other end is connected with the 3rd tunnel of FET Q1.
2nd RC absorbing circuits can absorb the peak voltage of FET Q1 generations, it is to avoid circuit voltage climbing mistake
Greatly, it is ensured that the safety of circuit.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, also including closed loop electricity
Stream backfeed loop, described closed loop current backfeed loop includes integrated chip U1, electric capacity C12, electric capacity C13, resistance R2, resistance
R15, resistance R16, adjustable resistance RT1, the described in-phase input end of integrated chip U1 are connected with the 3rd tunnel of FET Q1,
The inverting input of integrated chip U1 is connected by resistance R16 with GNDB ends, the output end of integrated chip U1 by resistance R15 with
The VFB ends connection of integrated chip U2, one end is anti-phase with integrated chip U1 after described electric capacity C12 is in parallel with adjustable resistance RT1
Input is connected, and the other end is connected with the output end of integrated chip U1, and described electric capacity C13 is in parallel latter with described resistance R2
End is connected with the COMP ends of integrated chip U2, and the other end is connected with the VFB ends of integrated chip U2.
Closed loop current backfeed loop can stablize the electric current between output QDH ends, OUT- ends, be unlikely to by input OUT+
End, the voltage at OUT- ends two ends export the change of load between QDH ends, OUT- ends and change, and make arc maintenance more stable.
Preferably, a kind of CUT arc maintenance electronics current-limiting resistance circuit described above, also including the second filter
Wave circuit, described the second filter circuit includes resistance R6, resistance R7, electric capacity C14, one end of described resistance R6 and field-effect
The 3rd tunnel connection of pipe Q1, the other end is connected with the in-phase input end of integrated chip U1, one end of described resistance R7 with it is integrated
The in-phase input end connection of chip U1, the other end is connected with freewheeling circuit, one end of described electric capacity C14 and the integrated chip
The in-phase input end connection of U1, the other end is connected with GNDB ends.
It is more enough to play more preferable filter action, circuit is more stablized.
The present invention has the advantages that：
1st, the present invention can well substitute relay of the prior art and inefficient current-limiting resistance so that the circuit after replacement
It is more reliable and more stable, the loss in circuit running is reduced, and lift the operating efficiency of arc maintenance.
2nd, simple structure of the present invention, firmly, component low cost is easy to safeguard and is overhauled.
Brief description of the drawings
Fig. 1 is a kind of electrical block diagram of CUT arc maintenance electronics current-limiting resistance circuit of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings 1 and specific embodiment the present invention is described in further detail, but they are not to this hair
Bright limitation：
Embodiment 1
As shown in figure 1, a kind of CUT arc maintenance electronics current-limiting resistance circuit, including current rectifying and wave filtering circuit 1, filtering output
Circuit 9, the two ends of described current rectifying and wave filtering circuit 1 are connected with OUT+ ends, OUT- ends respectively, described filtering output circuit 9
Two ends are connected with QDH ends, OUT- ends respectively, also including auxiliary power circuit 2, frequency configuration circuit 14, current-limiting circuit 3, field effect
Should pipe Q1, integrated chip U2, the first current sampling circuit 6, the first filter circuit 4, freewheeling circuit 8, described FET Q1
Include three tunnels, the OUT terminal of described integrated chip U2 is connected by current-limiting circuit 3 with the first via of FET Q1, described
Current rectifying and wave filtering circuit 1 be connected with second tunnel of FET Q1, the SEN ends of described integrated chip U2 pass through the first filtered electrical
The tunnel of road 4 one is connected with the 3rd tunnel of integrated chip U2, separately leads up to the first current sampling circuit 6, freewheeling circuit 8 and QDH ends
Connection, described frequency configuration circuit 14 RT/CT ends respectively with integrated chip U2, GND ends, VREF ends are connected, and described is auxiliary
Power circuit 2 is helped to be connected with the VCC ends of integrated chip U2.
Preferably, the current rectifying and wave filtering circuit 1 includes power diode D3, electric capacity C1, electric capacity C9, electric capacity C10, electric capacity
C6, the output end of one end and power diode D3 after described electric capacity C1, electric capacity C9, electric capacity C10, electric capacity C6 composition parallel circuits
Connection, the other end is connected with OUT- ends, and the input of described power diode D3 is connected with OUT+ ends, power diode D3's
Output end is also connected with second tunnel of FET Q1.
Preferably, described filtering output circuit 9 includes resistance R19, R20, R21, electric capacity C7, described resistance R19,
In parallel with electric capacity C7 after resistance R20, resistance R21 composition series circuit, described electric capacity C7 one end is connected with QDH ends, the other end
It is connected with OUT- ends.
Preferably, described auxiliary power circuit 2 includes auxiliary power supply end YH1, diode D1, electric capacity C3, electric capacity C4,
The input of described diode D1 is connected with the positive pole of auxiliary power supply end YH1, output end and the integrated chip U2 of diode D1
The connection of VCC ends, one end is connected with the VCC ends of integrated chip U2 after described electric capacity C3, electric capacity C4 constitutes parallel circuit, another
End is connected with GNDB ends.
Preferably, described frequency configuration circuit 14 includes electric capacity C2, resistance R3, electric capacity C8, described electric capacity C2 mono-
End is connected with GNDB ends, and the other end is connected with the VREF ends of integrated chip U2, and described resistance R3 one end is with integrated chip U2's
VREF ends connect, and the other end is connected with the RT/CT ends of integrated chip U2, described electric capacity C8 one end and the RT/ of integrated chip U2
CT ends connect, and the other end is connected with the GND ends of integrated chip U2.
Preferably, described current-limiting circuit 3 includes resistance R8, the first via of described FET Q1 passes through resistance R8
OUT terminal with integrated chip U2 is connected.
Preferably, the first described current sampling circuit 6 includes resistance R9, resistance R11, described resistance R9 and resistance
One end is connected with the 3rd tunnel of FET Q1 after R11 constitutes parallel circuit, and the other end is connected with freewheeling circuit 8.
Preferably, described first filter circuit 4 includes resistance R4, electric capacity C5, described resistance R4 one end with it is integrated
The SEN ends connection of chip U2, the other end is connected with the 3rd tunnel of described FET Q1, described electric capacity C5 one end and integrated core
The SEN ends connection of piece U2, the other end is connected with GNDB ends.
Preferably, described freewheeling circuit 8 includes power inductance L1, power diode D2, the power diode D2
Input be connected with OUT- ends, the output end of power diode D2 is connected by power inductance L1 with QDH ends.
Preferably, also include the second current sampling circuit 7, described second current sampling circuit 7 include resistance R12,
One end is connected with power inductance L1 after resistance R13, described resistance R12 and resistance R13 constitute parallel circuit, the other end and power
The output end connection of diode D2.
Preferably, also including a RC absorbing circuits 10, a described RC absorbing circuits 10 include resistance R17, electricity
Hold C11, it is in parallel with described power diode D2 after described resistance R17 and described electric capacity C11 series connection.
Preferably, also including slope equalizer 13, described slope equalizer 13 includes triode Q3, resistance
R5, resistance R10, the colelctor electrode c of the triode Q3 are connected with the VREF ends of described integrated chip U2, the triode Q3's
Base stage b is connected with the RT/CT ends of the integrated chip U2, and the emitter e of the triode Q3 passes through the tunnels of resistance R5 mono- and first
Filter circuit 4 is connected, and is separately led up to resistance R10 and is connected with the 3rd tunnel of FET Q1.
Preferably, also including the 2nd RC absorbing circuits 5, the 2nd described RC absorbing circuits 5 include resistance R14, electric capacity
One end is connected with second tunnel of FET Q1 after C15, described resistance R14 and electric capacity C15 constitute series circuit, the other end and
The 3rd tunnel connection of FET Q1.
Preferably, also including closed loop current backfeed loop 12, described closed loop current backfeed loop 12 includes integrated core
Piece U1, electric capacity C12, electric capacity C13, resistance R2, resistance R15, resistance R16, adjustable resistance RT1, described integrated chip U1's is same
Phase input is connected with the 3rd tunnel of FET Q1, and the inverting input of integrated chip U1 is connected by resistance R16 with GNDB ends
Connect, the output end of integrated chip U1 is connected by resistance R15 with the VFB ends of integrated chip U2, described electric capacity C12 and adjustable electric
One end is connected with the inverting input of integrated chip U1 after resistance RT1 parallel connections, and the other end is connected with the output end of integrated chip U1, institute
The electric capacity C13 for stating is connected with one end after described resistance R2 parallel connections with the COMP ends of integrated chip U2, the other end and integrated chip
The VFB ends connection of U2.
Preferably, also include the second filter circuit 11, described second filter circuit 11 include resistance R6, resistance R7,
Electric capacity C14, described one end of resistance R6 is connected with the 3rd tunnel of FET Q1, and the other end is same mutually defeated with integrated chip U1
Enter end connection, one end of described resistance R7 is connected with the in-phase input end of integrated chip U1, and the other end connects with freewheeling circuit 8
Connect, one end of described electric capacity C14 is connected with the in-phase input end of the integrated chip U1, and the other end is connected with GNDB ends.
Embodiment 2
As shown in figure 1, work when, CUT after powered up, input voltage is by power diode D3 rectifications and passes through
Cross the dc bus power supply as arc maintenance electronics current-limiting resistance circuit after electric capacity C1, electric capacity C6, electric capacity C9, electric capacity C10 are filtered.It is auxiliary
The electric current that feeder ear YH1 is provided is helped by diode D1 rectifications, and by defeated as accessory power supply after electric capacity C3, electric capacity C4 filtering
Enter the VCC ends to integrated chip U2 so that integrated chip U2 is powered and starts working.
Then the OUT terminal output PWM of integrated chip U2 opens signal so that FET Q1 is driven to turn on, and makes direct current female
Line power supply is by FET Q1, resistance R9, resistance R11, power inductance L1 and exports to QDH ends, due to power inductance L1's
Effect, the electric current in FET Q1 is linear rise, and it is also on linear to flow through resistance R9, the electric current of resistance R11 and voltage
Rise.
Voltage on resistance R9, resistance R11 is all the way by the homophase input of resistance R6, electric capacity C14 feeding integrated chip U1
End, integrated chip U1 carries out sending into after the amplification of certain multiple the VFB ends of integrated chip U2, integrated chip U2 to voltage signal
VFB ends function be error amplifier, integrated chip U2 with reference to VFB ends magnitude of voltage and adjust the pulse width of PWM to reach
To the purpose of limitation output current.
Another road of voltage is sent to the SEN ends of integrated chip U2 and more than after threshold values on resistance R9, resistance R11, integrated
The OUT terminal of chip U2 is closed PWM and opens signal, for protecting FET Q1 not damaged because of excessively stream, FET Q1 quilts
Close cut-off.When FET Q1 ends due to dc bus loop have stray inductance can scene effect pipe Q1 the second tunnel and the
Peak voltage is produced between three tunnels it is possible to cause the damage of FET Q1, and the of resistance R14, electric capacity C15 composition
Two RC absorbing circuits can slow down the amplitude of spike, it is ensured that the stabilization of circuit.
After FET Q1 cut-offs, magnetic energy is still stored on power inductance L1, and it is continuous to begin through power diode D2
Stream output then flows through resistance R12, the electric current of resistance R13 and voltage integrated by being sent into after resistance R7, electric capacity C14 to QDH ends
The in-phase input end of chip U1, integrated chip U1 carries out sending into integrated chip U2's after the amplification of certain multiple to voltage signal
VFB ends, integrated chip U2 with reference to VFB ends magnitude of voltage and adjust the pulse width of PWM to reach the purpose of limitation output current,
Until the work period of integrated chip U2 terminates and starts second work period, so circulation.
When integrated chip U2 first job end cycle and when starting second work period, FET Q1 is again
Turned on by driving, now DC bus-bar voltage can make by FET Q1, resistance R9, resistance R11, resistance R12, resistance R13
Power diode D2 enter reversely shut-off state, due to there is stray inductance in dc bus loop can be the two of power diode D2
End produces peak voltage, and a RC absorbing circuits of resistance R17, electric capacity C11 composition can slow down the amplitude of spike, so as to ensure
The stabilization of circuit.
So circulation, so as to reduce the loss during arc maintenance, improves the operating efficiency of arc maintenance.
In a word, presently preferred embodiments of the present invention is the foregoing is only, it is equal that all scopes according to the present patent application patent are made
Deng change and modification, should all belong to covering scope of the invention.
Claims (15)
1. a kind of CUT arc maintenance electronics current-limiting resistance circuit, including current rectifying and wave filtering circuit（1）, filtering output circuit
（9）, described current rectifying and wave filtering circuit（1）Two ends be connected with OUT+ ends, OUT- ends respectively, described filtering output circuit（9）
Two ends be connected with QDH ends, OUT- ends respectively, it is characterised in that：Also include auxiliary power circuit（2）, frequency configuration circuit
（14）, current-limiting circuit（3）, FET Q1, integrated chip U2, the first current sampling circuit（6）, the first filter circuit（4）, it is continuous
Current circuit（8）, described FET Q1 includes three tunnels, and the OUT terminal of described integrated chip U2 passes through current-limiting circuit（3）With
The first via connection of FET Q1, described current rectifying and wave filtering circuit（1）It is connected with second tunnel of FET Q1, described collection
Pass through the first filter circuit into the SEN ends of chip U2（4）It is connected with the 3rd tunnel of integrated chip U2 all the way, separately leads up to first
Current sampling circuit（6）, freewheeling circuit（8）It is connected with QDH ends, described frequency configuration circuit（14）Respectively with integrated chip U2
RT/CT ends, GND ends, VREF ends connection, described auxiliary power circuit（2）It is connected with the VCC ends of integrated chip U2.
2. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Current rectifying and wave filtering circuit（1）Including power diode D3, electric capacity C1, electric capacity C9, electric capacity C10, electric capacity C6, described electric capacity C1, electricity
Hold one end after C9, electric capacity C10, electric capacity C6 constitute parallel circuit to be connected with the output end of power diode D3, the other end and OUT-
End connection, the input of described power diode D3 is connected with OUT+ ends, the output end of power diode D3 also with field-effect
The second tunnel connection of pipe Q1.
3. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Filtering output circuit（9）Including resistance R19, R20, R21, electric capacity C7, described resistance R19, resistance R20, resistance R21 compositions
In parallel with electric capacity C7 after series circuit, described electric capacity C7 one end is connected with QDH ends, and the other end is connected with OUT- ends.
4. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Auxiliary power circuit（2）Including auxiliary power supply end YH1, diode D1, electric capacity C3, electric capacity C4, described diode D1's is defeated
Enter end to be connected with the positive pole of auxiliary power supply end YH1, the output end of diode D1 is connected with the VCC ends of integrated chip U2, described
One end is connected with the VCC ends of integrated chip U2 after electric capacity C3, electric capacity C4 constitute parallel circuit, and the other end is connected with GNDB ends.
5. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Frequency configuration circuit（14）Including electric capacity C2, resistance R3, electric capacity C8, described electric capacity C2 one end is connected with GNDB ends, another
End be connected with the VREF ends of integrated chip U2, described resistance R3 one end is connected with the VREF ends of integrated chip U2, the other end and
The RT/CT ends connection of integrated chip U2, described electric capacity C8 one end be connected with the RT/CT ends of integrated chip U2, the other end and collects
Connected into the GND ends of chip U2.
6. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Current-limiting circuit（3）Including resistance R8, the first via of described FET Q1 passes through the OUT terminal of resistance R8 and integrated chip U2
Connection.
7. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
The first current sampling circuit（6）Including resistance R9, resistance R11, it is latter that described resistance R9 and resistance R11 constitutes parallel circuit
End is connected with the 3rd tunnel of FET Q1, the other end and freewheeling circuit（8）Connection.
8. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
The first filter circuit（4）Including resistance R4, electric capacity C5, described resistance R4 one end is connected with the SEN ends of integrated chip U2, separately
One end is connected with the 3rd tunnel of described FET Q1, and described electric capacity C5 one end is connected with the SEN ends of integrated chip U2, another
End is connected with GNDB ends.
9. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 1, it is characterised in that：It is described
Freewheeling circuit（8）Connect including power inductance L1, the input of power diode D2, the power diode D2 and OUT- ends
Connect, the output end of power diode D2 is connected by power inductance L1 with QDH ends.
10. a kind of CUT arc maintenance electronics current-limiting resistance circuit according to claim 9, it is characterised in that：Also
Including the second current sampling circuit（7）, described the second current sampling circuit（7）Including resistance R12, resistance R13, described electricity
One end is connected with power inductance L1 after resistance R12 and resistance R13 constitutes parallel circuit, the output end of the other end and power diode D2
Connection.
A kind of 11. CUT arc maintenance electronics current-limiting resistance circuits according to claim 9, it is characterised in that：Also
Including a RC absorbing circuits（10）, described RC absorbing circuits（10）Including resistance R17, electric capacity C11, described resistance
It is in parallel with described power diode D2 after R17 and described electric capacity C11 series connection.
A kind of 12. CUT arc maintenance electronics current-limiting resistance circuits according to claim 1, it is characterised in that：Also
Including slope equalizer（13）, described slope equalizer（13）Including triode Q3, resistance R5, resistance R10, described three
The colelctor electrode c of pole pipe Q3 is connected with the VREF ends of described integrated chip U2, the base stage b of the triode Q3 and the integrated core
The RT/CT ends connection of piece U2, the emitter e of the triode Q3 is by the tunnels of resistance R5 mono- and the first filter circuit（4）Connection, separately
Resistance R10 is led up to be connected with the 3rd tunnel of FET Q1.
A kind of 13. CUT arc maintenance electronics current-limiting resistance circuits according to claim 1, it is characterised in that：Also
Including the 2nd RC absorbing circuits（5）, described the 2nd RC absorbing circuits（5）Including resistance R14, electric capacity C15, described resistance
One end is connected with second tunnel of FET Q1 after R14 and electric capacity C15 constitute series circuit, and the of the other end and FET Q1
Three tunnels connect.
A kind of 14. CUT arc maintenance electronics current-limiting resistance circuits according to claim 1, it is characterised in that：Also
Including closed loop current backfeed loop（12）, described closed loop current backfeed loop（12）Including integrated chip U1, electric capacity C12, electricity
Hold C13, resistance R2, resistance R15, resistance R16, adjustable resistance RT1, the in-phase input end of described integrated chip U1 and field-effect
The 3rd tunnel connection of pipe Q1, the inverting input of integrated chip U1 is connected by resistance R16 with GNDB ends, and integrated chip U1's is defeated
Go out end be connected with the VFB ends of integrated chip U2 by resistance R15, after described electric capacity C12 is in parallel with adjustable resistance RT1 one end and
The inverting input connection of integrated chip U1, the other end is connected with the output end of integrated chip U1, described electric capacity C13 with it is described
Resistance R2 parallel connection after one end be connected with the COMP ends of integrated chip U2, the other end is connected with the VFB ends of integrated chip U2.
A kind of 15. CUT arc maintenance electronics current-limiting resistance circuits according to claim 14, it is characterised in that：Also
Including the second filter circuit（11）, described the second filter circuit（11）Including resistance R6, resistance R7, electric capacity C14, described electricity
The one end for hindering R6 is connected with the 3rd tunnel of FET Q1, and the other end is connected with the in-phase input end of integrated chip U1, described
One end of resistance R7 is connected with the in-phase input end of integrated chip U1, the other end and freewheeling circuit（8）Connection, described electric capacity
One end of C14 is connected with the in-phase input end of the integrated chip U1, and the other end is connected with GNDB ends.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710159101.7A CN106735800B (en) | 2017-03-17 | 2017-03-17 | Plasma cutting machine pilot arc electron current-limiting resistance circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710159101.7A CN106735800B (en) | 2017-03-17 | 2017-03-17 | Plasma cutting machine pilot arc electron current-limiting resistance circuit |
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| CN106735800A true CN106735800A (en) | 2017-05-31 |
| CN106735800B CN106735800B (en) | 2022-04-01 |
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| CN201142782Y (en) * | 2007-11-15 | 2008-10-29 | 华南理工大学 | IGBT inversion type plasma electric power of high power digitalized high-frequency soft switch |
| CN202097491U (en) * | 2011-05-26 | 2012-01-04 | 昆山瑞凌焊接科技有限公司 | Plasma cutting pilot arc circuit |
| CN102794547A (en) * | 2012-08-04 | 2012-11-28 | 深圳市瑞凌实业股份有限公司 | Pilot arc chopped wave control circuit and cutting machine |
| CN204835908U (en) * | 2015-08-07 | 2015-12-02 | 上海沪工焊接集团股份有限公司 | Keep alive circuit and IGBT full bridge inverter thereof |
| CN105414728A (en) * | 2015-12-25 | 2016-03-23 | 华中科技大学 | Single-sensor arc striking circuit and control method thereof for air plasma cutter |
| CN206605143U (en) * | 2017-03-17 | 2017-11-03 | 浙江三锋实业股份有限公司 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
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2017
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| CN201142782Y (en) * | 2007-11-15 | 2008-10-29 | 华南理工大学 | IGBT inversion type plasma electric power of high power digitalized high-frequency soft switch |
| CN202097491U (en) * | 2011-05-26 | 2012-01-04 | 昆山瑞凌焊接科技有限公司 | Plasma cutting pilot arc circuit |
| CN102794547A (en) * | 2012-08-04 | 2012-11-28 | 深圳市瑞凌实业股份有限公司 | Pilot arc chopped wave control circuit and cutting machine |
| CN204835908U (en) * | 2015-08-07 | 2015-12-02 | 上海沪工焊接集团股份有限公司 | Keep alive circuit and IGBT full bridge inverter thereof |
| CN105414728A (en) * | 2015-12-25 | 2016-03-23 | 华中科技大学 | Single-sensor arc striking circuit and control method thereof for air plasma cutter |
| CN206605143U (en) * | 2017-03-17 | 2017-11-03 | 浙江三锋实业股份有限公司 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
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| CN106735800B (en) | 2022-04-01 |
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Denomination of invention: A plasma cutting machine arc maintaining electronic current limiting resistor circuit Effective date of registration: 20231115 Granted publication date: 20220401 Pledgee: Zhejiang Commercial Bank Co.,Ltd. Jinhua Yongkang Branch Pledgor: Zhejiang SAFUN Industrial Co.,Ltd. Registration number: Y2023980065648 |
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