CN106334857A - Arc striking circuit for arc welding - Google Patents
Arc striking circuit for arc welding Download PDFInfo
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- CN106334857A CN106334857A CN201611047781.5A CN201611047781A CN106334857A CN 106334857 A CN106334857 A CN 106334857A CN 201611047781 A CN201611047781 A CN 201611047781A CN 106334857 A CN106334857 A CN 106334857A
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- charge
- discharge
- optocoupler
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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
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
- B23K9/0672—Starting the arc without direct contact between electrodes
- B23K9/0673—Ionisation of the arc gap by means of a tension with a step front (pulses or high frequency tensions)
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention provides an arc weld arc striking circuit for generating high frequency voltage for igniting an electric arc.The arc welding circuit comprises a high voltage charging and discharging circuit, including a charging and discharging capacitance; an inverter boosting circuit for charging the charging and discharging capacitance; an amplitude detecting circuit for judging whether the charging voltage of the charging and discharging capacitance reaches the discharging standard voltage, and stopping the inverter boost circuit when the charging and discharging capacitance reaches the discharging standard voltage, and the triggering circuit is connected with the charging and discharging capacitance to form a high voltage pulse in the discharging phase and the charging and discharging capacitance forming path. The microcontroller circuit comprises a single chip computer which is connected with the inverter boosting circuit and the triggering circuit to periodically control the charging phase, the discharging phase and the holding phase, and controls the charging phase, the discharging phase and the holding phase to continuously circulate until the arc striking is successful.
Description
Technical field
The invention belongs to a kind of arc welding arc ignition circuit, particularly a kind of arc welding striking that stable high voltage pulse is provided
Circuit.
Background technology
Gas tungsten arc welding and part plasma weld commonly used high-frequency arc strike mode, this striking mode
Uniformity and less stable, and interference to external world is than larger.Particularly, adopt the microcomputer such as single-chip microcomputer, dsp, arm at present
Control the more and more of gas tungsten arc welding and plasma weldering, this kind of microcomputer control chip is very quick to High-frequency Interference
Sense, vulnerability to jamming is very poor.In addition, the tungsten electrode noble gas protecting that the automation equipment such as supporting welding robot, special plane uses at present
Weldering and the quantity of plasma arc welding (PAW) also increase year by year, and these automation equipments the vulnerability to jamming of High-frequency Interference is also had certain
Require.
In order to solve the problems, such as High-frequency Interference, in addition to filter the measure of high frequency by increasing filtering link etc., root
This solution is exactly to change striking mode, thus thoroughly eliminating interference source.And high-voltage pulse thread-leading arc mode can solve well
Certainly interference problem.
But, the design of high-voltage pulse thread-leading arcs a lot of at present is affected by outer work condition, device aging, electric power thus supplied etc.
Larger, lead to waveform inconsistent, thus same environment under arcing initiation success rate unstable situation occurs.Therefore, it is necessary to design
A kind of can solve the problem that high-frequency arc strike bring while interference improve arcing initiation success rate arc welding arc ignition circuit.
At present, generally adopt Alternating Current Power Supply in most of technology, after then recycling bridge rectifier, obtain direct current, then profit
Controlling power device with the trigger pulse that frequency is determined in timer generation is the square wave determining frequency by this DC inverter, passes through
Obtain several kilovolts of high-tension electricity after step-up transformer and high-voltage rectifier, then electricity is triggered by high-voltage charge and discharge circuit and spark
Road, thus reach striking purpose.
But, above-mentioned this high-frequency arc ignition circuit, concussion frequency is between 100khz to 300khz, shakes amplitude
Be decay, and be only capable of every time maintaining 2 to 6ms, and affected by outer work condition, the amplitude shaken every time and lasting when
Between unequal, and then it cannot be guaranteed that concussion waveform uniformity, thus have impact on stability and the uniformity of striking effect.And
And, this higher-order of oscillation all can bring serious electromagnetic interference to other electrical equipments and welding machine controller.
Content of the invention
The present invention provides a kind of arc welding arc ignition circuit, and for producing high frequency voltage with the electric arc that ignites, described arc welding is drawn
The course of work of arc circuit includes charging stage, discharge regime and holding stage；Described arc welding arc ignition circuit includes: high pressure fills
Discharge circuit, including charge and discharge capacitance, described charge and discharge capacitance one end ground connection；Inversion step-up circuit, with described charge and discharge capacitance
It is connected, low level direct current is changed into high level alternating current to be charged to charge and discharge capacitance in the charging stage；Mirror
Width circuit, is connected with described high-voltage charge and discharge road, whether reaches electric discharge standard electric with the charging voltage judging charge and discharge capacitance
Pressure；And be connected with described inversion step-up circuit, to make inversion boosting electricity when charge and discharge capacitance reaches electric discharge normal voltage
Road quits work；Triggers circuit, is connected with described charge and discharge capacitance, is made with forming path in discharge regime and charge and discharge capacitance
Obtain charge and discharge capacitance electric discharge and form high-voltage pulse；Single chip circuit, including single-chip microcomputer, described single-chip microcomputer is electric with described inversion boosting
Road, triggers circuit are connected, and to be timed control to charging stage, discharge regime and holding stage, and control charging rank
Section, discharge regime and holding stage are constantly circulated until striking is successful.
As a further improvement on the present invention, described amplitude discrimination circuit includes the partial pressure electricity being connected with described charge and discharge capacitance
Road, three-terminal voltage regulator and optocoupler；The input of described three-terminal voltage regulator is connected with described bleeder circuit, earth terminal
Ground connection, output end is connected with the input negative electrode of described optocoupler；The input anode of described optocoupler is connected with the first external voltage,
And described optocoupler input anode be connected with the input negative electrode of optocoupler by first resistor, the output anode of described optocoupler and
Second external voltage is connected, and output cathode is connected with described inversion step-up circuit.
As a further improvement on the present invention, described inversion step-up circuit includes inverter circuit and inverse-excitation converting circuit, institute
State inverter circuit and include current mode controller, nmos pipe, the source ground of described nmos pipe, grid and described current-mode control
The output end of device processed is connected；Described inverse-excitation converting circuit includes the first transformer, and the armature winding of described first transformer is even
It is connected between the 3rd external voltage and the drain electrode of nmos pipe, and the positive pole of armature winding of described first transformer and described the
Three external voltages are connected.
As a further improvement on the present invention, described inverter circuit also includes the first filter circuit, described first filtered electrical
Road includes the first electric capacity, second resistance and the first diode；Described first electric capacity is parallel with one another with second resistance and one end is connected
To described 3rd external voltage, the other end connects to the negative pole of described first diode, the positive pole of described first diode and institute
The drain electrode stating nmos pipe is connected.
As a further improvement on the present invention, the secondary windings of described first transformer includes the first secondary windings, and
Described inverse-excitation converting circuit also includes the second diode；The negative pole of described first secondary windings and the positive pole of described second diode
It is connected, negative pole one end earth-free with described charge and discharge capacitance of described second diode is connected with to described discharge and recharge electricity
Capacity charge.
As a further improvement on the present invention, described inversion step-up circuit also includes voltage source circuit, described first transformation
The secondary windings of device includes second subprime winding, and described voltage source circuit also includes described second subprime winding, described second
The positive pole of level winding is connected with described amplitude discrimination circuit by the second electric capacity.
As a further improvement on the present invention, described amplitude discrimination circuit includes the partial pressure electricity being connected with described charge and discharge capacitance
Road, three-terminal voltage regulator and optocoupler；The input of described three-terminal voltage regulator is connected with described bleeder circuit, earth terminal
Ground connection, output end is connected with the input negative electrode of described optocoupler；The input anode of described optocoupler and described second electric capacity are away from the
One end of the positive pole of secondary stage winding is connected, and is connected with the input negative electrode of optocoupler by first resistor, described optocoupler
Output anode is connected with the second external voltage, and output cathode is connected with described inversion step-up circuit.
As a further improvement on the present invention, described triggers circuit includes triode, the second transformer and controllable silicon；Described
The base stage of triode is connected with described single-chip microcomputer, grounded emitter, the armature winding of colelctor electrode and described second transformer
Negative pole is connected, and the positive pole of armature winding of described second transformer is connected with the 4th external voltage；Described second transformer
The positive pole of secondary pole winding be connected with silicon controlled control pole, described silicon controlled minus earth, described silicon controlled anode
One end earth-free with described charge and discharge capacitance is connected.
As a further improvement on the present invention, described single-chip microcomputer has the first output end and the second output end, and described first
Output end be connected with described inversion step-up circuit with control the charging stage and keep the stage duration, described second output end with
Described triggers circuit is connected to control the duration of discharge regime.
Compared with prior art, the method have the advantages that the present invention passes through single-chip microcomputer to charging stage, electric discharge
Stage, holding stage are controlled, and the frequency of the high-voltage pulse of output is accurately controlled, improves the one of output waveform
Cause property and stability, and will not be affected by outer work condition, device aging, electric power thus supplied etc..And, the present invention adopts inversion
Booster circuit is charged to charge and discharge capacitance it can be ensured that charge and discharge capacitance reaches electric discharge normal voltage, and by amplitude discrimination electricity
Road ensure that the stability of this capacitance voltage, therefore, can further improve the stability of output waveform, has substantially increased striking
Success rate.
Brief description
Fig. 1 is the circuit diagram of arc welding arc ignition circuit of the present invention；
Fig. 2 is the oscillogram of the voltage of subelement in arc welding arc ignition circuit of the present invention；
Fig. 3 is the selected parts of the datasheet of current mode controller uc3843 in the present invention.
Specific embodiment
Describe the present invention below with reference to specific embodiment shown in the drawings.But these embodiments are simultaneously
Do not limit the present invention, structure that those of ordinary skill in the art is made, method or functionally according to these embodiments
Conversion is all contained in protection scope of the present invention.
According to Fig. 1 and Fig. 2, the invention provides a kind of arc welding arc ignition circuit, for producing high frequency voltage to draw
Combustion electric arc.Described arc welding arc ignition circuit includes:
High-voltage charge and discharge road 10, including charge and discharge capacitance c4, one end ground connection of described charge and discharge capacitance c4；
Inversion step-up circuit 20, is connected with described charge and discharge capacitance c4, to turn low level direct current in the charging stage
Turn to high level alternating current to be charged to charge and discharge capacitance c4；
Amplitude discrimination circuit 30, is connected with described high-voltage charge and discharge road 10, to judge the charging in described charge and discharge capacitance c4
Whether voltage has reached electric discharge normal voltage；And also be connected with described inversion step-up circuit 20, with charge and discharge capacitance c4
Reach during electric discharge normal voltage so that inversion step-up circuit 20 quits work, to stop charge and discharge capacitance c4 is charged；
Triggers circuit 40, is connected with described charge and discharge capacitance c4, with discharge regime and described charge and discharge capacitance c4 shape
Becoming path that charge and discharge capacitance is discharged, thus forming high-voltage pulse, carrying out striking；
Single chip circuit 50, including single-chip microcomputer n1, described single-chip microcomputer n1 and described inversion step-up circuit 20, triggers circuit 40
It is connected, so that control is timed to charging stage, discharge regime and holding stage.
Thus, herein by single-chip microcomputer n1, charging stage, discharge regime and holding stage are timed, single-chip microcomputer n1 is not
During work, whole circuit does not work, and when single-chip microcomputer n1 starts working, the charging stage, single-chip microcomputer n1 controls inversion boosting electricity
Road 20 works, and charge and discharge capacitance is charged, and meanwhile, amplitude discrimination circuit 30 is monitored to the voltage of charge and discharge capacitance c4；
Charge after a period of time, the voltage in charge and discharge capacitance c4 reaches electric discharge normal voltage, and amplitude discrimination circuit 30 turns on, from
And transmitting a signal to inversion step-up circuit 20 so that inversion step-up circuit 20 disconnects, the charging stage terminates, in charge and discharge capacitance c4
Voltage keep constant；
Single-chip microcomputer n1 controls discharge regime to start, and single-chip microcomputer n1 controls triggers circuit 40 to turn on, thus described triggers circuit
Form path, so that described charge and discharge capacitance c4 electric discharge forms high-voltage pulse between 40 and charge and discharge capacitance c4；
After discharge regime terminates, whole circuit enters the holding stage, and inversion step-up circuit 20 does not work, and determines when keeping the stage
When terminate after, enter the charging stage again, and carry out above-mentioned circulation, until striking success.
Therefore, the present invention is controlled to charging stage, discharge regime, holding stage by single-chip microcomputer n1, to output
The frequency of high-voltage pulse is accurately controlled, and improves uniformity and the stability of output waveform, and will not be subject to extraneous work
The impact of condition, device aging, electric power thus supplied etc..And, the present invention is carried out to charge and discharge capacitance c4 using inversion step-up circuit 20
Charge it can be ensured that charge and discharge capacitance c4 reaches electric discharge normal voltage, and this capacitance voltage be ensure that by amplitude discrimination circuit 30
Stability, therefore, can further improve the stability of output waveform, has substantially increased the success rate of striking.
Specifically, described amplitude discrimination circuit 30 includes being connected with described charge and discharge capacitance c4 bleeder circuit, three ends are adjustable
Voltage-stablizer a4 and optocoupler op1.The input of described three-terminal voltage regulator a4 is connected with described bleeder circuit, ground connection termination
Ground, output end is connected with the input negative electrode of described optocoupler op1.The input anode of described optocoupler op1 and the first external voltage v1
It is connected, and the input anode of described optocoupler op1 is connected with the input negative electrode of optocoupler op1 by first resistor r1, described
The output anode of optocoupler op1 is connected with the second external voltage v2, and output cathode passes through the 6th diode and described inversion boosting
Circuit 20 is connected.
When the input of described three-terminal voltage regulator a4 reaches certain voltage, the exportable burning voltage of output end.?
In present embodiment, model tl430 of described three-terminal voltage regulator a4, therefore defeated in described three-terminal voltage regulator a4
When entering the voltage that end reaches about 2.5v, the voltage of the exportable about 2v of output end；And the input in described three-terminal voltage regulator a4
When end is unable to reach 2.5v, output end is equivalent to open circuit.
From the foregoing, it can be understood that the input anode of described optocoupler op1 is connected with the first external voltage v1, and by the first electricity
Resistance r1 is connected with the input negative electrode of optocoupler op1, and the input negative electrode of described optocoupler op1 is then with described three-terminal voltage regulator a4's
Output end is connected.Then, when the output end of described three-terminal voltage regulator a4 is open circuit, the input anode of described optocoupler op1
It is connected by first resistor r1 with input negative electrode, thus voltage is equal, is the first external voltage v1, and optocoupler op1's is defeated
Enter pole and be equivalent to a diode, when both end voltage is equal, diode is not turned on, and optocoupler op1 does not work, then optocoupler op1
Output stage disconnects, the output cathode Non voltage output of described optocoupler op1；When described three-terminal voltage regulator a4 output end exports about
During voltage for 2v, then the input stage two ends of optocoupler op1 form voltage difference, and diode current flow, by the short circuit of first resistor r1, optocoupler
Op1 works, and the output stage of optocoupler op1 is turned on, then output cathode output high level (the i.e. second external electricity of optocoupler op1
Pressure v2) give described inversion step-up circuit 20.With this, described amplitude discrimination circuit 30 can reach the voltage differentiating in charge and discharge capacitance c4
Effect.In the present embodiment, described second external voltage v2 is 3.3v, then, when optocoupler op1 works, optocoupler op1 is to described
Inversion step-up circuit 20 flows into the high level of this 3.3v.
In present embodiment, adopt optocoupler op1 in amplitude discrimination circuit 30, there is electrical isolation.That is, make high-pressure side
(circuit such as high-voltage charge and discharge circuit) and low-pressure side (comprising the circuit such as single chip circuit 50, inversion boosting) carry out electrical isolation,
High-voltage pulse is avoided to produce interference to work such as single-chip microcomputer n1.
And, proved by test, under the premise of ensure that striking is successful, the minimum safe voltage that can reach is
900v, then, in present embodiment, taking the charging voltage of 900v as a example, calculated.Therefore, required for described charge and discharge capacitance c4
The voltage being filled with is 900v.Then bleeder circuit described above includes the 11st resistance r11 and the 12nd resistance r12, and the described tenth
One resistance r11 and the 12nd resistance r12 mutually head and the tail connect, and are connected in parallel on the two ends of described charge and discharge capacitance c4.Then described
The voltage got on 12 resistance r12 is the input terminal voltage of described three-terminal voltage regulator a4.Therefore, so that
When voltage in charge and discharge capacitance c4 reaches maximum voltage 900v, the output end of three-terminal voltage regulator a4 just can be exported,
The resistance of therefore described 11st resistance r11 is about 20m ω, and the resistance of described 12nd resistance r12 is about 56k ω, thus can
So that when charge and discharge capacitance c4 reaches 900v, the partial pressure on described 12nd resistance r12 reaches 2.5v, thus controllable described
The output end output of three-terminal voltage regulator a4 is about the voltage of 2v.
Therefore, the amplitude discrimination circuit 30 in the present invention passes through the cooperation of three-terminal voltage regulator a4 and optocoupler op1, can be to charge and discharge
Voltage in electric capacity c4 is monitored, and when the voltage in charge and discharge capacitance c4 reaches 900v, the input of optocoupler op1 is cloudy
Extremely exportable high level is to inversion step-up circuit 20 so that inversion step-up circuit 20 stops charge and discharge capacitance c4 is filled immediately
Electricity, prevents the voltage in charge and discharge capacitance c4 excessive or damages circuit.
Described inversion step-up circuit 20 includes inverter circuit and inverse-excitation converting circuit, and direct current is changed by described inverter circuit
For alternating current, described inverse-excitation converting circuit is in order to bring the voltage up rapidly to be charged to charge and discharge capacitance c4.Described inverse
Become circuit and include current mode controller a1, nmos pipe vt1, the source ground of described nmos pipe vt1, grid and described current-mode
The output end of formula controller a1 is connected.In the present embodiment, the source electrode of described nmos pipe vt1 is connect by the 7th resistance r7
Ground.Described inverse-excitation converting circuit includes the first transformer t1, and the armature winding of described first transformer t1 is connected to the described 3rd
Between the drain electrode of external voltage v3 and nmos pipe vt1, and the positive pole of armature winding of described first transformer t1 and described the
Three external voltage v3 are connected.
Described inverter circuit be may make up for core collocation peripheral circuit with described current mode controller a1, specifically,
In present embodiment, model uc3843 that described current mode controller a1 is adopted, uc3843 is that domestic application is wider
A kind of general current control mode pulse width modulator, so-called current source PWM device is to carry out adjusting pulsewidth by feedback current.?
The input of pwm comparator is directly compared with the signal and error amplifier output signal that flow through outputting inductance coil current
Relatively, the inductance peak point current tracking error voltage change of output is made to change thus adjusting dutycycle.There is voltage due in structure
Ring, electric current loop bicyclic system, therefore, the voltage regulation factor of Switching Power Supply, load regulation and transient response characteristic all have
Improve, be more satisfactory new controller.
As shown in figure 1, being a kind of basic circuit of inverter circuit of the present invention, wherein 6 pin of current mode controller a1 are
Output is connected with the grid of nmos pipe vt1 by the 6th resistance r6, and output or not output voltage are to control described nmos pipe
Vt1 cut-offs.2 pin are that vfb is connected with amplitude discrimination circuit 30 described above and single-chip microcomputer n1, to control described inverter circuit to open
Begin or quit work, and this 2 pin starts for low level, that is, only when the voltage inputting 2 pin is low level, described current-mode
Formula controller a1 just can start working.In addition, this 2 pin passes through the 4th resistance r4 ground connection.Specifically, this current mode controller a1
2 pin be connected with the output cathode of optocoupler op1 in described amplitude discrimination circuit 30, thus, according to described above, when described amplitude discrimination electricity
When the voltage that road 30 detects in this charge and discharge capacitance c4 reaches 900v, the output end of described optocoupler op1 turns on and to described electricity
The 2 pin input high levels (i.e. the second external voltage v2) of stream mode controller a1, so that described inversion step-up circuit 20 stops
Only work, and stop charging into described charge and discharge capacitance c4.
Described current mode controller a1 can produce rectangular wave pulse, and the amplitude of this rectangular wave pulse is vi's by 7 pin
DC input voitage determines；Its dutycycle is determined by the input voltage of 2 pin；Its reverse frequency is by inversion resistance rt and inversion electric capacity
Ct determines, 8 pin that one end of described inversion resistance rt is connected to described current mode controller a1 are vref, and the other end connects 4
Pin is rt/ct, and it is rt/ct that one end of described inversion electric capacity ct connects 4 pin, and the other end is grounded.Thus, described Controlled in Current Mode and Based
The reverse frequency f of device a1 is:
And, in the present embodiment, by adjusting the size of inversion resistance rt and inversion electric capacity ct, rt=15k, ct=
1nf, then be defined to 120khz by described reverse frequency, and cycle t is about 9 μ s.
In addition, the dutycycle of described current mode controller is determined by 2 pin voltages, in the case that 1 pin is vacant, such as
Really 2 pin voltages are more than chip internal reference voltage 2.5v then chip stop output, if less than 2.5v then export set
Big space rate.Wherein, because, in present embodiment, the inversion electric capacity of described current mode controller a1 is 1nf, then as Fig. 3 institute
Show, by inquiring about " deadtime vs ct " table, Dead Time can be obtained and be about 0.5 μ s, then maximum duty cycle d=td/t approximates
50%.Certainly, it is more than datasheet reference according to the current mode controller a1 model uc3843 chip in the present invention
Draw, in actual applications, then by the debugging to circuit, can finally determine that the output frequency of this current mode controller is
120khz, the waveform of dutycycle 50%.
It should be noted that in the present embodiment, described 7 pin are the input voltage of vi is 12v, therefore, this embodiment party
It is 12v that current mode controller a1 in formula can produce amplitude, and dutycycle is 50%, and frequency is the square wave of 120khz.
In addition, the connected mode of other pins of described current mode controller a1 is as follows: described 1 pin is that comp is hanging；3
Pin is that isense is connected with the source electrode of described nmos pipe vt1 by the 9th resistance r9, in order to detect electric current；5 pin are ground
Ground connection；So that described current mode controller a1 normal work.
Therefore, square wave produced by described current mode controller a1 produces on-off action, institute to described nmos pipe vt1
State nmos pipe vt1 also according to 120khz frequency turn off, thus described inverter circuit can by the 3rd external voltage v3 be passed through straight
Stream electricity is reverse into the pulse that frequency is 120khz.In the present embodiment, the value of described 3rd external voltage v3 is 24v, therefore
The pulse of 24v, 120khz can be formed in the armature winding of described first transformer t1.
In addition, also including the first filter circuit in described inverter circuit, described first filter circuit include the first electric capacity c1,
Second resistance r2, the first diode d1；Described first electric capacity c1 is parallel with one another with described second resistance r2 and one end is connected to institute
State the 3rd external voltage v3, the other end connects to the negative pole of described first diode d1, the positive pole of described first diode d1 with
The drain electrode of described nmos pipe vt1 is connected.Described first electric capacity c1, second resistance r2 and the first diode d1 can form rcd filter
Wave circuit, is filtered so that whole system is more stable to peak voltage in voltage signal.
The secondary windings of described first transformer t1 includes the first secondary windings, and described inverse-excitation converting circuit also includes
Second diode d2；The negative pole of described first secondary windings is connected with the positive pole of described second diode d2, and the described 2nd 2
The negative pole of pole pipe d2 one end earth-free with described charge and discharge capacitance c4 is connected to charge to described charge and discharge capacitance c4.
The number of turn of described first secondary windings and the equal turn numbers of described armature winding, and described second diode d2
Positive pole is connected to the negative pole of described first secondary windings, thus constituting described inverse-excitation converting circuit, described inverse-excitation converting circuit
And quick charge can be carried out to charge and discharge capacitance c4 to being high voltage pulse by the impulse transfer of 24v.Specifically, it is analyzed as follows:
Because the two ends of transformer are equivalent to two inductance, for convenience of explanation, below by described first transformer t1's
Armature winding is designated as inductance l1, and first secondary windings of the first transformer t1 is designated as inductance l2.In described nmos pipe vt1 conducting
Period, the 3rd external voltage v3 is the inductance l1 that 24v voltage flows through described transformer, then due to the effect of inductance itself, flow through
The electric current of the armature winding of the first transformer t1 can be linearly increasing, thus this first transformer t1 can convert electrical energy into magnetic energy and deposit
Storage is in inductance l1.It can be seen from figure 1 that first secondary windings of the first transformer t1 is contrary with the Same Name of Ends of armature winding,
Thus the second diode d2 can be made to end because reverse-biased, in inductance l2, no current passes through.
And during described nmos pipe vt1 disconnects, flow through the electric current vanishing of inductance l1, store the magnetic energy in inductance l1
By Mutual Inductance Coupling in inductance l2, and make the second diode d2 positively biased and conducting, thus this first transformer t1 release
Energy, and quick storage is to charge and discharge capacitance c4.Therefore, to be actually a primary tight with secondary for described first transformer t1
The inductor that close coupling is closed.
And in actual applications, in the case that the 3rd external voltage v3 is 24v, the first time of described first transformer t1
Within the voltage of level winding can reach 1000v, thus quick charge can be carried out to described charge and discharge capacitance c4, and fill described in guaranteeing
Discharge capacity c4 quickly fills with to 900v.
Described inversion step-up circuit 20 also includes voltage source circuit, and described voltage source circuit includes described first transformer t1
Second subprime winding, the number of turn of described second subprime winding is the half of described armature winding.In the present embodiment, described
The positive pole of second subprime winding is connected with described amplitude discrimination circuit 30 by the second electric capacity c2.Therefore, described voltage source circuit is
Constitute the first external voltage v1 described above, from without separately connecing voltage source so that whole circuit is simpler clear.
And, described voltage source circuit includes the 4th diode d4, the positive pole and described first of described 4th diode d4
The negative pole of the second subprime winding of transformer t1 is connected, and negative pole is connected with described second electric capacity c2, to prevent electric current to be inverted.
In addition, described second electric capacity c2 is connected with described amplitude discrimination circuit 30 by the 8th resistance r8.
Described triggers circuit 40 includes triode vt3, the second transformer t2 and controllable silicon vt2；The base of described triode vt3
Pole is connected with described single-chip microcomputer n1, grounded emitter, the negative pole phase of colelctor electrode and the armature winding of described second transformer t2
Connect, the positive pole of armature winding of described second transformer t2 is connected with the 4th external voltage v4；Described second transformer t2
The positive pole of secondary pole winding be connected with the control pole of controllable silicon vt2, the minus earth of described controllable silicon vt2, described controllable silicon
The anode of vt2 one end earth-free with described charge and discharge capacitance c4 is connected.
Described controllable silicon vt2 is equivalent to a switch, when the control pole of described controllable silicon vt2 adds forward voltage, institute
State anode and the negative electrode conducting of controllable silicon vt2, then in the present embodiment, described charge and discharge capacitance c4 discharges immediately, is drawn
Arc.
In the present embodiment, described discharge regime is controlled by single-chip microcomputer n1.Described single-chip microcomputer n1 and described triode vt3
Base stage be connected, when the base stage of described triode vt3 receives high level, the colelctor electrode of described triode vt3 and transmitting
Pole turns on, and the 4th external voltage v4 has electric current to flow through the armature winding of described second transformer t2, thus the second transformer t2
Secondary windings also produces electric current, and adds to the control pole of described controllable silicon vt2 so that the anode of controllable silicon vt2 and negative electrode turn on,
Discharge regime starts.Described 4th external voltage v4 is 24v, and voltage is excessive relative to the control pole of controllable silicon vt2, therefore by the
Two transformer t2 are depressured, and the number of turn between the armature winding of described second transformer t2 and secondary windings is 24:5.Certainly,
When the base stage of described triode vt3 does not receive high level, described triode vt3 disconnects, the negative electrode of described controllable silicon vt2
And anode also disconnects, described charge and discharge capacitance c4 does not discharge.
In addition, described triggers circuit 40 also includes the 3rd diode d3, the positive pole of described 3rd diode d3 and described the
The positive pole of the secondary windings of two transformer t2 is connected, and prevents electric current reverse-biased；And, described triggers circuit 40 also includes the second filter
Wave circuit, described second filter circuit includes the 3rd electric capacity c3 and the tenth resistance r10, described 3rd electric capacity c3 and the tenth resistance
R10 is parallel with one another and one end is connected to the control pole of controllable silicon vt2, and the other end is connected to the negative electrode of controllable silicon vt2, with to voltage
It is filtered so that circuit work is more stable.
Finally, described single chip circuit 50 to charging stage of whole arc welding arc ignition circuit, discharge regime, keep the stage
It is controlled, and control whole output duration.Described single-chip microcomputer n1 has the first output end and the second output end, and described first is defeated
Go out end and be connected with described inversion step-up circuit 20 with the duration controlling the charging stage and keep the stage, described second output end and
Described triggers circuit 40 is connected to control the duration of discharge regime.
Specifically, first output end of described single-chip microcomputer n1 passes through the 2 of the 5th diode d5 and current mode controller a1
Pin is connected, and second output end of described single-chip microcomputer n1 passes through the triode of the 5th resistance r5 and triggers circuit 40 described above
The base stage of vt3 is connected.
First, enter the charging stage, first output end of described single-chip microcomputer n1 exports the timing signal of 4ms.As above-mentioned institute
State, 2 pin due to described current mode controller a1 work for low level, then in the timing signal of this 4ms, described single-chip microcomputer
The first output end output low level of n1 is so that described current mode controller a1 starts working.After 4ms timing terminates, described
First output end changes into high level output, and second output end of described single-chip microcomputer n1 exports the high level of 13 μ s immediately,
Control triode vt3 conducting, enter discharge regime, so that described charge and discharge capacitance c4 electric discharge.And then, in discharge regime
The holding stage is entered, second output end of described single-chip microcomputer n1 exports the low level of 16ms, and, described monolithic immediately after end
First output end of machine n1 also keeps high level until the timing of 16ms terminates.So far this charge and discharge capacitance c4 completes and once fills
Electricity and discharge cycle, are designated as a striking cycle.After a cycle terminates, repeat the above-mentioned cycle so that whole circuit follows
Ring works, until striking success or single-chip microcomputer n1 quit work.
Therefore, the exportable amplitude of whole circuit is 900v, and pulse width is 4ms (13 μ s numerical value are too small and ignore), duty
Than the impulse waveform for 20% (13 μ s numerical value are too small and ignore).
Described single-chip microcomputer n1, by enabling signal control, enables signal and controls described single-chip microcomputer n1 to start working and terminate work
Make, and control the timing total duration of described single-chip microcomputer n1 to be less than 50 above-mentioned cycles, this is to export height due to long
Pressure pulse, for whole circuit and welding machine, is likely to cause insulating barrier to puncture, thus causing harm.Certainly, if pulse
Cycle is very few, then can affect the success rate of striking, therefore, is less than according to the high-voltage pulse of previous experiences and data analysis striking
50 above-mentioned cycles.
In addition, why selecting the duration of the discharge regime of 13 μ s, it is to prevent discharge regime duration long thus to controlled
Silicon vt2 causes damage.
Model lpc902 of described single-chip microcomputer n1,1 pin of therefore described single-chip microcomputer n1 is that vdd meets external voltage 3.3v, 2
Pin is that p0.2/kbi2 connects enable signal, and 3 pin are p0.0/kbi0 is that the first output end is connected with described current mode controller a1
Connect, 4 pin are that p1.5/-rst meets the 5th external voltage v5 by the 13rd resistance r13, described 5th external voltage v5 is 3.3v, 5
Pin is that p0.6/kbi6 is the second output end and the base stage with described triode vt3 is connected, and 6 pin are p0.5/kbi5 ground connection, 7 pin
I.e. p0.4/kbi4 is connected with the negative electrode of the negative input end of described optocoupler op1, and 8 pin are vss ground connection.
By foregoing description, in conjunction with Fig. 2, the workflow of whole arc welding arc ignition circuit is illustrated:
At the beginning, when enabling signal disconnection, single-chip microcomputer n1 does not work, and the 3 pin output high level of single-chip microcomputer n1, due to electric current
2 pin of mode controller a1 are that low level starts, and therefore, whole circuit does not start；
Then, the t1 time arrives, and enables signal and opens, single-chip microcomputer n1 starts working, 5 pin output low levels, triggers circuit 40
Do not work；And 3 pin of single-chip microcomputer n1 start to export the output of the optocoupler op1 in the low level of lasting 4ms, and amplitude discrimination circuit 30
Level disconnects, and also exports low level, then now 2 pin of current mode controller a1 receive for low level, Controlled in Current Mode and Based
Device a1 starts working；
After current mode controller a1 starts working, 6 pin of current mode controller a1 export the rectangular pulse of 120khz
Ripple, and pass through inverse-excitation converting circuit, quick charge is carried out to charge and discharge capacitance c4；
After charge and discharge capacitance c4 is full of, the t2 time arrives, by bleeder circuit so that three ends of amplitude discrimination circuit 30 can
The input adjusting voltage-stablizer a4 reaches cut-in voltage, and the output end of described three-terminal voltage regulator a4 starts to export, and makes light
The negative electrode of the output stage of coupling op1 starts to export high level, so that described current mode controller a1 quits work, now,
Voltage in described charge and discharge capacitance c4 keeps 900v；
The 4ms of 3 pin of described single-chip microcomputer n1 is timed to, that is, the t3 time arrive, 3 pin of single-chip microcomputer n1 switch to high level, and
5 pin of described single-chip microcomputer n1 start to export the high level of 13 μ s so that triggers circuit 40 works, then the negative electrode of controllable silicon vt2 and
Anode turns on, and described charge and discharge capacitance c4 starts to discharge；
After the timing of 13 μ s terminates, the release of voltage in charge and discharge capacitance c4 finishes, and reaches the t4 time, and the 5 of single-chip microcomputer n1
Pin recovers low level again, and 3 pin then keep high level and start the timing of 16ms；
The timing of 3 pin of single-chip microcomputer n1 terminates, and the t5 time arrives, and 3 pin of single-chip microcomputer n1 start to export low level, go forward side by side
The above-mentioned circulation of row；
Whole arc welding arc ignition circuit is persistently charged stage, discharge regime and holding stage, until striking success or
Enable blackout.
In sum, described arc welding arc ignition circuit includes high-voltage charge and discharge circuit, inversion step-up circuit 20, amplitude discrimination circuit
30th, triggers circuit 40, single chip circuit 50, thus, by inversion step-up circuit 20, charge and discharge capacitance c4 quickly can be filled
Electricity, triggers circuit 40 carries out repid discharge to charge and discharge capacitance c4, and by single-chip microcomputer n1 to charging stage, discharge regime, guarantor
The stage of holding is controlled, thus can ensure that described charge and discharge capacitance c4 is filled to 900v, and to the charging interval and can put
The electric time is accurately controlled, so that final impulse waveform is relatively stable, is greatly improved the success rate of striking.
And, adopt three-terminal voltage-stabilizing adjustable device, optocoupler op1 and bleeder circuit composition amplitude discrimination circuit 30 in the present invention to charging
Voltage in electric capacity is detected, can accurately detect the accurately voltage in charging capacitor, and by high-pressure section and list
Piece machine n1 etc. is not separately so that high-pressure section interferes with the work of single-chip microcomputer n1, current mode controller a1 so that whole electricity
Arc-welding arc ignition circuit is relatively stable.
It should be understood that although this specification is been described by according to embodiment, but not each embodiment only comprises one
Individual independent technical scheme, only for clarity, those skilled in the art should will say this narrating mode of specification
As an entirety, the technical scheme in each embodiment can also be through appropriately combined, and forming those skilled in the art can for bright book
With the other embodiment understanding.
The a series of detailed description of those listed above is only for the feasibility embodiment of the present invention specifically
Bright, they simultaneously are not used to limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention
Or change should be included within the scope of the present invention.
Claims (9)
1. a kind of arc welding arc ignition circuit, for produce high frequency voltage with ignite electric arc it is characterised in that: described arc welding striking
The course of work of circuit includes charging stage, discharge regime and holding stage；Described arc welding arc ignition circuit includes:
High-voltage charge and discharge circuit, including charge and discharge capacitance, described charge and discharge capacitance one end ground connection；
Inversion step-up circuit, is connected with described charge and discharge capacitance, low level direct current is changed into high electricity in the charging stage
Flat alternating current is to be charged to charge and discharge capacitance；
Amplitude discrimination circuit, is connected with described high-voltage charge and discharge road, whether reaches electric discharge with the charging voltage judging charge and discharge capacitance
Normal voltage；And be connected with described inversion step-up circuit, to make inversion when charge and discharge capacitance reaches electric discharge normal voltage
Booster circuit quits work；
Triggers circuit, is connected with described charge and discharge capacitance, makes charge and discharge to form path in discharge regime and charge and discharge capacitance
Electric capacity electric discharge forms high-voltage pulse；
Single chip circuit, including single-chip microcomputer, described single-chip microcomputer is connected with described inversion step-up circuit, triggers circuit, with to filling
Electric stage, discharge regime and holding stage are timed control, and control charging stage, discharge regime and holding stage continuous
It is circulated until striking is successful.
2. arc welding arc ignition circuit according to claim 1 it is characterised in that: described amplitude discrimination circuit includes and described charge and discharge
Bleeder circuit, three-terminal voltage regulator and optocoupler that electric capacity is connected；The input of described three-terminal voltage regulator with described
Bleeder circuit is connected, and earth terminal is grounded, and output end is connected with the input negative electrode of described optocoupler；The input anode of described optocoupler
It is connected with the first external voltage, and the input anode of described optocoupler is connected with the input negative electrode of optocoupler by first resistor
Connect, the output anode of described optocoupler is connected with the second external voltage, output cathode is connected with described inversion step-up circuit.
3. arc welding arc ignition circuit according to claim 1 it is characterised in that: described inversion step-up circuit include inversion electricity
Road and inverse-excitation converting circuit, described inverter circuit includes current mode controller, nmos manages, the source ground of described nmos pipe,
Grid is connected with the output end of described current mode controller；Described inverse-excitation converting circuit includes the first transformer, and described
The armature winding of one transformer is connected between the 3rd external voltage and the drain electrode of nmos pipe, and described first transformer just
The positive pole of level winding is connected with described 3rd external voltage.
4. arc welding arc ignition circuit according to claim 3 it is characterised in that: described inverter circuit also includes the first filtering
Circuit, described first filter circuit includes the first electric capacity, second resistance and the first diode；Described first electric capacity and the second electricity
Resistance is parallel with one another and one end connects to described 3rd external voltage, and the other end connects to the negative pole of described first diode, described
The positive pole of the first diode is connected with the drain electrode of described nmos pipe.
5. arc welding arc ignition circuit according to claim 3 it is characterised in that: the secondary windings bag of described first transformer
Include the first secondary windings, and described inverse-excitation converting circuit also includes the second diode；The negative pole of described first secondary windings with
The positive pole of described second diode is connected, the negative pole of described second diode and described charge and discharge capacitance earth-free one end phase
Connect to charge to described charge and discharge capacitance.
6. arc welding arc ignition circuit according to claim 3 it is characterised in that: described inversion step-up circuit also includes voltage
Source circuit, the secondary windings of described first transformer includes second subprime winding, and described voltage source circuit also includes described second
Secondary windings, the positive pole of described second subprime winding is connected with described amplitude discrimination circuit by the second electric capacity.
7. arc welding arc ignition circuit according to claim 6 it is characterised in that: described amplitude discrimination circuit includes and described charge and discharge
Bleeder circuit, three-terminal voltage regulator and optocoupler that electric capacity is connected；The input of described three-terminal voltage regulator with described
Bleeder circuit is connected, and earth terminal is grounded, and output end is connected with the input negative electrode of described optocoupler；The input anode of described optocoupler
It is connected with one end of the positive pole away from second subprime winding for described second electric capacity, and cloudy with the input of optocoupler by first resistor
Pole is connected, and the output anode of described optocoupler is connected with the second external voltage, output cathode and described inversion step-up circuit phase
Connect.
8. arc welding arc ignition circuit according to claim 1 it is characterised in that: described triggers circuit include triode,
Two transformers and controllable silicon；The base stage of described triode is connected with described single-chip microcomputer, grounded emitter, colelctor electrode and described the
The negative pole of the armature winding of two transformers is connected, the positive pole of armature winding of described second transformer and the 4th external voltage phase
Connect；The positive pole of the secondary pole winding of described second transformer is connected with silicon controlled control pole, and described silicon controlled negative electrode connects
Ground, described silicon controlled anode one end earth-free with described charge and discharge capacitance is connected.
9. arc welding arc ignition circuit according to claim 1 it is characterised in that: described single-chip microcomputer have the first output end and
Second output end, described first output end be connected with described inversion step-up circuit with control the charging stage and keep the stage when
Long, described second output end is connected with described triggers circuit to control the duration of discharge regime.
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| CN201611047781.5A CN106334857B (en) | 2016-11-23 | 2016-11-23 | A kind of arc welding arc ignition circuit |
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| CN201611047781.5A CN106334857B (en) | 2016-11-23 | 2016-11-23 | A kind of arc welding arc ignition circuit |
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| CN106334857B CN106334857B (en) | 2018-06-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111390345A (en) * | 2020-03-10 | 2020-07-10 | 广州亦高电气设备有限公司 | High voltage discharge equipment for welding installations |
| TWI817432B (en) * | 2022-04-07 | 2023-10-01 | 宏碁股份有限公司 | Power delivery system with electric arc suppression |
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| DE2614152A1 (en) * | 1976-04-02 | 1977-10-20 | Stk Gmbh | Welding arc striking pulse - produced by glow tube discharging capacitor through pulse transformer on reaching breakdown voltage |
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| EP0538227A1 (en) * | 1991-10-14 | 1993-04-21 | ESAB Aktiebolag | Welding current source for alternating-current arc welding |
| CN2276390Y (en) * | 1996-07-19 | 1998-03-18 | 清华大学 | High-frequence arc striking device for contravariant switch type arc processing power |
| CN102218579A (en) * | 2011-06-17 | 2011-10-19 | 上海威特力焊接设备制造股份有限公司 | Environment-friendly high-frequency arc ignition generator |
| CN206356704U (en) * | 2016-11-23 | 2017-07-28 | 昆山华恒焊接股份有限公司 | A kind of arc welding arc ignition circuit |
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| DE2614152A1 (en) * | 1976-04-02 | 1977-10-20 | Stk Gmbh | Welding arc striking pulse - produced by glow tube discharging capacitor through pulse transformer on reaching breakdown voltage |
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| EP0538227A1 (en) * | 1991-10-14 | 1993-04-21 | ESAB Aktiebolag | Welding current source for alternating-current arc welding |
| CN2276390Y (en) * | 1996-07-19 | 1998-03-18 | 清华大学 | High-frequence arc striking device for contravariant switch type arc processing power |
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| CN206356704U (en) * | 2016-11-23 | 2017-07-28 | 昆山华恒焊接股份有限公司 | A kind of arc welding arc ignition circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111390345A (en) * | 2020-03-10 | 2020-07-10 | 广州亦高电气设备有限公司 | High voltage discharge equipment for welding installations |
| TWI817432B (en) * | 2022-04-07 | 2023-10-01 | 宏碁股份有限公司 | Power delivery system with electric arc suppression |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106334857B (en) | 2018-06-19 |
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