CN1978114B - Electric-arc power control method for arc-welding power supply and apparatus - Google Patents
Electric-arc power control method for arc-welding power supply and apparatus Download PDFInfo
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- CN1978114B CN1978114B CN2005101293443A CN200510129344A CN1978114B CN 1978114 B CN1978114 B CN 1978114B CN 2005101293443 A CN2005101293443 A CN 2005101293443A CN 200510129344 A CN200510129344 A CN 200510129344A CN 1978114 B CN1978114 B CN 1978114B
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Abstract
The present invention relates to an arc power control method of arc welding power source and its device. Said method includes the following steps: adopting a circuit with linear or non-linear sampling conversion function, converting arc welding voltage into arc voltage signal, using a dividing circuit to make voltage signal and arc power set signal undergo the process of division operation to output a quotient, and using it as current control signal of arc welding power source. The adoption of said method and device can make various arc welding power sources.
Description
Technical field
A kind of method and device that is used for Arc Welding Power (being commonly called as electric welding machine) is realized arc power control.It relates to Arc Welding Power, especially exports control technology.
Background technology
With regard to structure, Arc Welding Power divides two big classes.One class is rotary, and another kind of is non-rotating.Rotary Arc Welding Power is actually a kind of generator, and because of a rotating armature is arranged, so day is rotary, its output electric arc is the power control type.The non-rotating Arc Welding Power is by the power supply of industry or domestic power grid, armature without spin, thereby gain the name.Up to now, they all still are current-control type or voltage-controlled type, or electric current and alternating voltage control type, are the non-power control type.Compare their welding quality, power control type Arc Welding Power is much better than non-power control type Arc Welding Power in some welding procedure occasion.Since rotary Arc Welding Power manufacturing cost height, the body heaviness, the energy consumption height, for this reason, China Ministry of Machine-Building Industry hereinafter stops the production and the use of such Arc Welding Power.So the Arc Welding Power of design arc power control type promptly becomes purpose of the present invention.
The arc power control curve of non-rotating Arc Welding Power is single, can't change along with the variation of welding procedure.The object of the invention is also tackled the control that arc power is realized constant power and non-constant power, different change curves.That is:
1, P
0=I
0U
0: arc power does not change, is constant power control, is Linear Control yet with arc voltage.
2, P
0=f (U
0): arc power increases with the rising of arc voltage, or raises with arc voltage and to reduce, i.e. the control of different change curves, also be nonlinear Control.
In the formula, P
0: arc power I
0: arc-welding electric current U
0: arc-welding voltage
The inventive method can be used to make the Arc Welding Power of manual arc welding machine, consumable electrode/non-consumable gas shielded arc welding machine, submerged arc welding machine etc.Compare not only applied range, and energy-conservation, material-saving with rotary Arc Welding Power.
Summary of the invention
The arc power control method of Arc Welding Power is
1, arc-welding voltage is carried out linearity or non-linear sampling conversion, to form the arc voltage signal.
2, with the arc voltage signal as divisor, carry out division arithmetic with the arc power setting signal as dividend, the merchant of gained is removed to control the output current of Arc Welding Power as current controling signal.
3, above-mentioned divisor or quotient signal are carried out the clamp processing or divisor and quotient signal are all carried out the clamp processing, to prevent Arc Welding Power output overcurrent.
Arc-welding voltage sampling point can be located on Arc Welding Power output, welding cable line terminal or welding rod and the welded piece.Near actual arc-welding both end voltage, sampling precision is the highest the most in sampling on welding rod and welded piece.But, also can satisfy sampling requirement of the present invention in the sampling of Arc Welding Power output as long as the cross-section of cable is long-pending enough big.By the arc voltage signal that the linearity sampling forms, it and arc-welding voltage are linear equal proportion relation, are linear relationship, can make the present invention realize the constant power of arc power is controlled, and promptly when arc voltage changed, arc power was constant.And the arc voltage signal that forms by non-linear sampling, it becomes non-equal proportion relation, is non-linear relation with arc-welding voltage, can make the present invention realize the non-constant power control of arc power, promptly arc power increases with the rising of arc-welding voltage, or reduces with the rising of arc-welding voltage.
In division arithmetic, when divisor trends towards zero, quotient will trend towards infinity.During welding, the welding rod short circuit can often take place.During short circuit, arc-welding voltage trends towards zero, the arc voltage signal after the sampling conversion also trends towards zero, quotient will trend towards infinity.With the control signal of infinitely-great quotient as the arc-welding electric current, Arc Welding Power will be exported overcurrent, and its result must cause Arc Welding Power to damage.Therefore, must carry out the clamp restriction or divisor and quotient are all carried out the clamp restriction divisor or quotient.
The following describes the arc power control device of Arc Welding Power
This arc power control device includes:
1, an arc-welding voltage sample circuit (A1), it carries out the arc-welding voltage (U0) of input linearity or non-linear sampling conversion, exports arc voltage signal (U1);
2, a division circuit (A2), input dividend input be arc power setting signal (P1), input divisor input be by the arc voltage signal (U1) of sample circuit (A1) output, the current controling end that its quotient (I1) exports Arc Welding Power to;
3, a clamp circuit or a clamp circuit or a clamp circuit and clamp circuit that is used for quotient (I1) is carried out clamp that is used for divisor arc voltage signal (U1) is carried out clamp that is used for quotient (I1) is carried out clamp that is used for divisor arc voltage signal (U1) is carried out clamp.
For the transmission that realizes signal with connect, for the circuit of different structure, may also need add voltage follower, phase inverter, V/I isolation transmitter spare (voltage transformation electric current), I/V isolation transmitter spare (current transformation voltage), current-limiting resistance or filter circuit etc.Sample circuit is that arc-welding voltage (U0) is transformed to arc voltage signal (U1), and its conversion has two kinds: a kind of is linear transformation; Another kind is a nonlinear transformation.In non-linear sampling transform circuit, contain a non-linear transform circuit, to realize the nonlinear transformation of arc voltage signal (U1) to arc-welding voltage (U0).The sample point of arc-welding voltage (U0) has three: one, the Arc Welding Power output, and the 2nd, welding cable line terminal, the 3rd, welding rod welds on the workpiece with quilt.Sampling can be equal to the sampling of electric arc both end voltage on welding rod and quilt welding workpiece, and sampling precision is the highest, but use is inconvenient, because it wants external two long leads, thereby in majority welding occasion, arc-welding voltage sampling point is arranged on the Arc Welding Power output mostly.As long as the welding cable cross-sectional area is enough big, fall influence to reduce line pressure, take a sample, also can satisfy the requirement of apparatus of the present invention at the Arc Welding Power output to sampling.The so-called arc-welding voltage of the present invention, include sampling voltage to above-mentioned three place's sample points.
Division circuit (A2) is used for arc power setting signal (P1) and arc voltage signal (U1) are carried out division arithmetic, arc power setting signal (P1) adds the dividend input of division circuit as dividend, arc voltage signal (U1) adds the divisor input of division circuit as divisor, behind division arithmetic, its quotient (I1) just can be used as the output current control signal of Arc Welding Power.Division circuit (A2) can be selected special-purpose division integrated circuit (as DIY100) for use, also can select the integrated circuit (as MPY100) that contains division function for use, also can select for use by multiplier integrated circuit (as AD633, MC1594, MC1595) and operational amplifier and connect the combined type division circuit that forms, also can select for use by transconductance type operational amplifier (as LM3080) and operational amplifier and connect the combined type division circuit that forms.
The numerical relation of division circuit (A2) is: I
1=P
1/ U
1When arc voltage signal (U1) and arc-welding voltage are the linear ratio relation, its power output (P
0) and output voltage (U
0), output current (I
0) the pass be: P
0=I
0U
0, according to above-mentioned definition, arc power can not change with the variation of arc-welding voltage, and especially when arc-welding voltage sampling point was arranged on welding rod and the welded piece, its relation was all the more so.So when adopting linear equal proportion to take a sample conversion to arc-welding voltage, apparatus of the present invention can realize the control of electric arc constant power; Otherwise, be non-equal proportion when concerning if arc voltage signal (U1) and arc-welding voltage (U0) are non-linear, P then
0≠ I
0V
0Apparatus of the present invention can realize non-constant power control.If when arc voltage signal (U1) reduces along with the rising of arc-welding voltage gradually for arc-welding voltage (U0) sampling ratio, also be that the amplification of divisor (U1) is when reducing gradually, then the amplification of quotient (I1) strengthens gradually, in this case, arc power can increase with the rising of arc-welding voltage, is referred to as the incremental control of arc power.Otherwise can realize that arc power reduces with the rising of arc-welding voltage, be referred to as the descending control of arc power.
Also must illustrate a bit at this, when under constant power controlled condition, and the sample point of arc-welding voltage (U0) is when being located on the output of Arc Welding Power, and actual arc power can increase to some extent along with the rising of arc voltage, and this is because the influence that the welding cable line pressure falls.For remedying the influence that line pressure falls, adopt the degression type control of the arc power that adapts, can realize constant power control to electric arc on the contrary.This is what happened latter.During the constant power control of narration among the present invention, still whether being that linear equal proportion is sampled as boundary to arc-welding voltage (U0).
From division I
1=P
1/ U
1Relational expression in as can be known, when U1 is very little, keep P1 constant, I1 is just very big.Can make Arc Welding Power cause the output overcurrent for Arc Welding Power, excessive current controling signal (I1).Apparatus of the present invention are provided with a divisor clamp circuit (A31) to divisor (U1), in order to restriction | U1| must not be less than the divisor clamping voltage | U2|, quotient (I1) is provided with a quotient clamp circuit (A32), in order to restriction | I1| must not be greater than the quotient clamping voltage | U3|.In actual use, according to the control stability of control device, can select wherein a kind of.Certainly, two kinds are all adopted meeting more reliable.
Description of drawings:
Accompanying drawing 1: the arc power control device of Arc Welding Power of the present invention (is called for short: electric theory diagram apparatus of the present invention)
Accompanying drawing 2: a kind of voltage-type arc-welding voltage sample circuit in apparatus of the present invention
Accompanying drawing 3: a kind of voltage-type arc-welding voltage sample circuit that contains isolating device in apparatus of the present invention
Accompanying drawing 4: a kind of current mode arc-welding voltage sample circuit that contains isolating device in apparatus of the present invention
Accompanying drawing 5: a kind of division circuit that adopts multiplier to combine in apparatus of the present invention
Accompanying drawing 6: a kind of divisor clamp circuit of electric resistance partial pressure type in apparatus of the present invention
Accompanying drawing 7: a kind of divisor clamp circuit of voltage follower formula in apparatus of the present invention
Accompanying drawing 8: a kind of quotient clamp circuit of electric resistance partial pressure type in apparatus of the present invention
Accompanying drawing 9: a kind of quotient clamp circuit of voltage stabilizing tubular type in apparatus of the present invention
Accompanying drawing 10: a kind of quotient clamp circuit of voltage follower in apparatus of the present invention
Accompanying drawing 11: a kind of diode-type incremental non-linear transform circuit in apparatus of the present invention
Accompanying drawing 12: a kind of voltage stabilizing tubular type incremental non-linear transform circuit in apparatus of the present invention
Accompanying drawing 13: a kind of voltage follower formula incremental non-linear transform circuit in apparatus of the present invention
Accompanying drawing 14: a kind of descending non-linear transform circuit in apparatus of the present invention
Accompanying drawing 15: a kind of Arc Welding Power arc power control device of incremental of direct sample formula in apparatus of the present invention
Accompanying drawing 16: a kind of Arc Welding Power arc power control device that adopts the incremental of Hall element in apparatus of the present invention
The specific embodiment
1, a kind of electric resistance partial pressure type arc-welding voltage sample circuit (A1) (seeing accompanying drawing 2), this bleeder circuit is connected in series with (R2) by divider resistance (R1) and forms, its serial connection two ends are connected across on the arc-welding voltage sampling point through lead respectively, the filter circuit of forming via resistance (R3) and electric capacity (C1) from the partial pressure value of the serial connection point of two resistance output, filter its interchange and pulse signal, export as arc voltage signal (U1) level and smooth back.Voltage-stabiliser tube (D1) is used for overvoltage protection.
2, a kind of voltage-type sample circuit (A1) (seeing accompanying drawing 3) that contains isolating device.This circuit is compared many isolation transmitter spares (F1) with above-mentioned electric resistance partial pressure type arc-welding voltage sample circuit.It is arranged on after the filter circuit of being made up of resistance (R3) and capacitor C 1.Arc voltage signal (U1) is level after this isolating device is sent to.
Divider resistance in the embodiment 1 and 2 (R1) is one in the principle design, owing to be to higher arc-welding voltage sampling, limited by the power condition of resistance itself, they may be formed by many resistance serial connections, but its sampling action is treated as single resistance (R1).
3, a kind of current mode arc-welding voltage sample circuit (A1) (seeing accompanying drawing 4) that contains power device.It is finished voltage sampling by current-limiting resistance and is converted into electric current, and electric current is transported to isolating device (F1).Single from sampling requirement, current-limiting resistance is one but from Power Limitation and filtering requirements, resistance can be split into two (R4 and R5) or many compositions that are connected in series mutually of serial connection mutually.Isolating device (F1) is a kind of I/V or I/I type, i.e. elementary input be sampling current, secondary output is corresponding voltage or current signal, is connected in series a little and cross-over connection filter capacitor (C1) between the ground at resistance (R4 and R5), constitutes filter circuit with current-limiting resistance.Voltage-stabiliser tube (D1) is used to limit overvoltage, and isolating device (F1) can be selected Hall current sensor for use, as HNV025A.
4, a kind of combined type division circuit (A2) (seeing accompanying drawing 5) that adopts multiplier.This combined type division circuit (A2) is to be connected with resistance (R9) by multiplier integrated circuit (IC1), operational amplifier (IC2), resistance (R8) to form.The multiplier integrated circuit have two multiplier inputs (X1) with (Y1), a product output (W).This circuit is combination like this: divisor is that arc voltage signal (U1) is imported from a multiplier input (X1), another multiplier input (Y1) is connected with operational amplifier (IC2) output, and output quotient (I1), the product output (W) of multiplier integrated circuit is connected through the inverting input of resistance (R8) with operational amplifier (IC2), arc power setting signal (P1) through resistance (R9) also with operational amplifier IC2) inverting input be connected, operational amplifier (IC2) in-phase input end is ground connection or via a resistance (R11) ground connection directly, resistance (R10) concatenation operation amplifier (IC2) inverting input and power supply ground, also can.Resistance (R10) and the input resistance that (R11) is used for balancing operational amplifier two inputs.Arc power setting signal (P1) in the above-mentioned input division circuit (A2) is original arc power setting signal, or later signal or its inversion signal of its inversion signal or transformation and add transformation again after signal.
Resistance (R8) is pressed following formula with resistance (R9) resistance and is determined
R
9I
1U
1＝-10R
8P
1
In the formula: U
1Get clamping voltage value, P
1Power taking arc rated power setting value, I
1Get rated current and set value, promptly obtain R
8With R
9Ratio, again according to the output impedance of multiplier integrated circuit (IC1), determine resistance (R8) resistance, obtain resistance (R9) resistance again.
Above-mentioned 4 as seen must illustrate a bit that also by, the quotient that this division circuit is obtained (I1) has an anti-phase relation (-) with the right Side of equation.Therefore to note before signal input division circuit, or after division circuit output,, utilize voltage inverter to make polarity and handle according to the circuit needs.
The multiplier integrated circuit can be selected AD633 for use, and operational amplifier can be selected AD712 for use.
5, a kind of divisor clamp circuit (A31) (seeing accompanying drawing 6) of electric resistance partial pressure type.It is a kind of electric resistance partial pressure type, and the bleeder circuit that is connected in series mutually by resistance (R12) and resistance (R13) is connected across a burning voltage (U4) two ends, between partial pressure value and clamping voltage value (U2) differ the forward voltage drop value of a switching diode (D2).Diode (D2) is connected across two resistance (R12 and R13) and is connected in series a little on the transmission line with divisor-signal (U1).
6, a kind of divisor clamp circuit (A31) (seeing accompanying drawing 7) of voltage follow formula.) this clamp circuit is made up of with resistance (R16) and electric capacity (C3) an operational amplifier (IC3) and a diode (D3), resistance (R15), operational amplifier (IC3) is formed voltage follower with diode (D3), its circuit connects: the output of operational amplifier (IC3) is connected with a utmost point of diode (D3), and another utmost point of diode (D3) is connected with the inverting input and divisor-signal (U1) transmission line of operational amplifier (IC3).Resistance (R15) composes in series bleeder circuit mutually with resistance (R16), is connected across on the burning voltage (U4), and its serial connection point is to operational amplifier (IC3) in-phase end input clamp setting voltage (U2), from the clamping voltage of follower output divisor (U1).
When divisor is positive signal, burning voltage (U4) in above-mentioned two kinds of divisor clamp circuits should be positive polarity, and diode cathode connects on the transmission line of divisor (U1), if divisor is the negative polarity signal, voltage (U4) should be negative polarity, and diode (D4) should be anti-phase.
7, a kind of quotient of electric resistance partial pressure type (I1) clamp circuit (A32) (seeing accompanying drawing 8).It is made up of two divider resistances (R17 and R18), current-limiting resistance (R19), diode (D4), filter capacitor (C4 and C5), resistance (R20) and operational amplifier (IC4).Resistance (R19), resistance (R20), diode (D4) link together with each end of electric capacity (C4), the other end of resistance (R19) is connected with quotient (I1) output of division circuit, and the other end of resistance (R20) is connected with the in-phase input end of electric capacity (C5) and operational amplifier (IC4).Electric capacity (C4) and electric capacity (C5) other end ground connection, resistance (R17) and resistance (R18) are connected in series mutually, are connected across that a burning voltage (U5) is gone up, its serial connection point is connected with the other end of diode (D4), resistance (R17) and the serial connection partial pressure value of resistance (R18) provide relevant clamping voltage, partial pressure value and clamping voltage (U3) both differ a diode forward voltage drop value.Quotient behind clamp (I1) is transported to the current controling end of Arc Welding Power through resistance (R20), operational amplifier (IC4) by the resistance (R19) and the line of diode (D4).Voltage-stabiliser tube is Zener diode or integrated voltage-stabiliser tube.
8, a kind of quotient of voltage stabilizing tubular type (I1) clamp circuit (A32) (seeing accompanying drawing 9).It is formed by voltage-stabiliser tube (D5), resistance (R19) and resistance (R20), electric capacity (C4), electric capacity (C5) and as the operational amplifier (IC4) of voltage follower.Resistance (R19), resistance (R20), electric capacity (C4) are connected with voltage-stabiliser tube one utmost point, the quotient I1 of resistance (R19) other end and division circuit) output is connected, resistance (R20) other end is connected with electric capacity (C5) and operational amplifier in-phase input end, another utmost point ground connection of Zener diode, the other end of electric capacity (C5) is ground connection also.Provide clamping voltage (U3) by voltage-stabiliser tube (D5), the quotient behind clamp (I1) is transported to the Arc Welding Power current controling end by the resistance (R19) and the line of voltage-stabiliser tube (D5) through resistance (R20), operational amplifier (IC4).Voltage-stabiliser tube is Zener diode or integrated voltage-stabiliser tube.
9, clamp circuit (seeing accompanying drawing 10) a kind of quotient I1 of voltage follower formula).It is made up of operational amplifier (IC4), operational amplifier (IC5), diode (D6), divider resistance (R21 and R22), current-limiting resistance (R19), resistance (R22), electric capacity (C4), electric capacity (C5) and electric capacity (C6).Resistance (R21) is connected in series mutually with (R22), is connected across on the burning voltage (U5), and its serial connection point provides the clamp setting voltage (U3) of the quotient (I1) of this circuit to the in-phase input end of operational amplifier (IC5).Electric capacity (C6) is connected across operational amplifier (IC5) in-phase input end and power supply ground, the output of operational amplifier (IC5) is connected with an end of diode (D6), the other end of diode (D6) is connected with the inverting input of operational amplifier (IC5), both form voltage follower, and the inverting input of operational amplifier (IC5) and current-limiting resistance (R19) and resistance (R20), electric capacity (C4) are connected.The other end of current-limiting resistance (R19) is connected with quotient (I1) output of division circuit.The other end of resistance (R20) is connected with the in-phase input end of electric capacity (C5) and operational amplifier (IC4).Operational amplifier (IC4) is connected into voltage follower.Electric capacity (C4) and the equal ground connection of electric capacity (C5) other end.Quotient behind clamp (I1) is transported to the current controling end of Arc Welding Power through resistance (R20), operational amplifier (IC4) by the resistance (R19) and the connecting line of the inverting input of operational amplifier (IC5).
The follower of being made up of (IC4) when the current controling end input resistance of Arc Welding Power is enough big, in above-mentioned quotient (I) 1 clamp circuit can.When quotient (I1) was positive polarity, the positive terminal of diode (D4 and D6) was connected the transmission line of quotient (I1), and burning voltage (U5) is a positive polarity.And when quotient (I1) was reverse voltage, diode (D4), (D6) and voltage-stabiliser tube (D5) were all anti-phase, and burning voltage (U5) is a negative polarity.
10, the non-linear sampling transform circuit of a kind of incremental (seeing accompanying drawing 11).It is connected in series with diode (D7) by resistance (R14) and forms, and diode (D7) can be that one, two or many serial connections form.Its variation incremental change increases with the increase of diode (D7) forward voltage drop.Resistance (R14) and diode (D7) sequential circuit be connected across on the transmission line of divisor (U1) with power supply on the ground, its is again the load of prime arc voltage signal (U1) simultaneously.
11, the non-linear sampling transform circuit of a kind of incremental of voltage stabilizing tubular type (seeing accompanying drawing 12).It by voltage-stabiliser tube (D8), resistance (R23) and resistance (R24), and resistance (R14) form.Resistance (R23), resistance (R24) are connected with voltage-stabiliser tube (D8) utmost point, and wherein the other end of resistance (R23) inserts on the burning voltage (U6), another termination divisor (I1) transmission line of resistance (R24).Another utmost point ground connection of voltage-stabiliser tube (D8).Resistance (R14) termination divisor (I1) transmission line, other end ground connection.The incremental change of this translation circuit can increase along with reducing of resistance (R24), and relevant with the voltage stabilizing value of voltage-stabiliser tube.Voltage-stabiliser tube is Zener diode or integrated voltage-stabiliser tube.
12, the non-linear sampling transforming circuit of a kind of incremental of voltage follower formula (seeing accompanying drawing 13).It is made up of computing amplification appliance (IC6) and resistance (R26), resistance (R27), resistance (R24), resistance (R14) and electric capacity (C7).Computing amplification appliance (IC6) connect into voltage follower circuit, output through resistance (R24) be connected with resistance (R14) and divisor (V1) transmission line, resistance (R14) other end ground connection.Resistance (R26) is in series, is connected across on the burning voltage (U6) with resistance (R27), and its serial connection point provides setting voltage to operational amplifier (IC6) in-phase end.Electric capacity (C7) is used for filtering, is connected across operational amplifier (IC6) in-phase input end and power supply on the ground.The non-linear increasing amount reduces and increases with resistance (R24) resistance, and relevant with setting voltage value.
For the above three kinds of non-linear sampling transform circuit of incremental, when the arc voltage signal of previous stage sample circuit output is current mode, then the divisor transmission line can directly be connected with the arc voltage signal output part, and when the arc voltage signal of previous stage sample circuit output is voltage-type, then between the circuit formed by resistance (R25) and operational amplifier (IC7) of serial connection.Wherein, operational amplifier connects into voltage follower, and the arc voltage signal is sent to divisor (U1) transmission line from the input of operational amplifier in-phase end through resistance (R25).Resistance (R25) participates in nonlinear transformation, and follower is used for the output impedance of conversion arc voltage signal output part.If the output impedance of former arc voltage signal (U1) output is very little, so computing amplification appliance (IC7) can, and only with inserting a resistance (R25).
For the above three kinds of non-linear sampling transform circuit of incremental, when the arc voltage signal is positive polarity, the negative pole of diode (D7) and voltage-stabiliser tube (D8) is ground connection separately all, burning voltage (U6) is a positive polarity, and when the arc voltage signal is negative polarity, diode (D7) all should be anti-phase with voltage-stabiliser tube (D8), and burning voltage (U6) is a negative polarity.
13, the non-linear sampling transform circuit of a kind of descending (seeing accompanying drawing 14), it is made up of operational amplifier (IC8) and operational amplifier (IC9), resistance (R28), resistance (R29), resistance (R30) and electric capacity (C9).Operational amplifier (IC9) connects into voltage follower circuit, its in-phase end connects the in-phase input end of operational amplifier (IC3) in voltage follower formula divisor (U1) clamp circuit, output is connected to the reversed-phase output of operational amplifier (IC8) through resistance (R30), resistance (R29) concatenation operation amplifier (IC8) inverting input and output, resistance (R28) is formed operational amplifier in-phase end input filter with electric capacity (C9), arc voltage signal (U1) without conversion is imported from operational amplifier (IC8) in-phase end, by the arc voltage signal (U1) after the output output nonlinear transformation.In this circuit, operational amplifier (IC8) is formed in-phase amplifier with resistance (R29) and resistance (R30), and its decrement that provides is by the ratio decision of resistance (R29) with resistance (R30), and ratio increases, and decrement also increases.
14, a kind of output control device of complete direct sample formula incremental Arc Welding Power.The each several part structure of this circuit is clear in above-mentioned explanation, and the effect of all same numeral elements is all identical.Difference everywhere mainly is described here:
The arc voltage signal (U1) that carries out in one, this circuit after the non-linear sampling conversion is a positive polarity, so must have one to be negative value in arc power setting signal (P1) and the quotient (I1), and available phase inverter carries out reversal.
Two, (K1) is a kind of electronic switch, when it is connected, inserts sample circuit (A1) by resistance (R21), (R2) with the non-linear transform circuit that voltage-stabiliser tube is formed.Sample circuit (A1) is the non-linear transform circuit.And when working as (K1) and turn-offing, sample circuit is the linear transform circuit.Make this Arc Welding Power have non-constant power of electric arc and constant power output function.
Three, arc voltage sample resistance (R1) when connecting different resistance (R1) with switch (K2), has promptly changed sampling ratio with (R1-1) and (R1-2) replacement, to adapt to the welding of different-diameter welding rod.
When four, working as (K2) connection " 3 " end, sample line ground connection, no arc-welding voltage input, then the input divisor (U1) of divider is the clamping voltage value, be a fixed value, i.e. (P1) decision of signal that quotient (I1) is set by arc power fully, Arc Welding Power just is returned to the primary current control type by the arc power control type.
15, a kind of output control device (seeing accompanying drawing 16) of isolating sampling formula incremental Arc Welding Power, the each several part structure of this circuit is clear in above-mentioned explanation, all same numeral elements, its effect is all identical.4 points will be described here:
The arc voltage signal (U1) that carries out in one, this circuit after the non-linear sampling conversion is a negative polarity, and this is because isolating device (F1) adopts anti-phase input.
Two, resistance (R15) uses the resistance of two kinds of different resistances of resistance (R15-1) and resistance (R16-1) to substitute respectively, when with electronic switch (K3) when connecting them respectively, with the partial pressure value (U2) of resistance (R16) is different, therefore can change the clamping voltage of divisor (U1);
Three, the series resistor (R4-1) with resistance (R4) is the resistance of two kinds of different resistances with resistance (R4-2).When with electronic switch (K4) when connecting them respectively, its sampling current limliting is different, therefore can change sampling ratio;
Four, when (K4) connects " 3 " end, sample line ground connection, no arc-welding voltage input, then the divisor (V1) of divider input is the clamping voltage value, be a fixed value, by i.e. (P1) decision of arc power setting signal, Arc Welding Power just is returned to the primary current control type by the arc power control type to quotient (I1) fully.
Apparatus of the present invention can be used as an independent control device, insert in the control device of current mode Arc Welding Power, by switch transition, can make Arc Welding Power not only have current controling characteristic but also a tool power control characteristic, make original product innovation upgrading.
Claims (18)
1. the arc power control method of an Arc Welding Power is characterized in that this method includes:
One, arc-welding voltage is carried out linearity or non-linear sampling conversion, to form the arc voltage signal;
Two, with the arc voltage signal as divisor, carry out division arithmetic with the arc power setting signal as dividend, the merchant of gained is removed to control the output current of Arc Welding Power as current controling signal;
Three, above-mentioned divisor or quotient are carried out the processing of signal clamp, or divisor and quotient are all carried out the processing of signal clamp, to prevent Arc Welding Power output overcurrent.
2. the arc power control device of an Arc Welding Power is characterized in that this device includes:
One, an arc-welding voltage sample circuit (A1), it carries out linearity or non-linear sampling conversion with the arc-welding voltage (U0) of input, output arc voltage signal (U1);
Two, a division circuit (A2), that import the dividend input is arc power setting signal (P1), what import the divisor input is that its quotient (I1) exports the current controling end of Arc Welding Power to by the arc voltage signal (U1) of sample circuit (A1) output;
Three, a clamp circuit (A31) or clamp circuit (A32) that is used for quotient (I1) is carried out clamp that is used for divisor arc voltage signal (U1) is carried out clamp, or a clamp circuit (A31) and a clamp circuit (A32) that is used for quotient (I1) is carried out clamp that is used for divisor arc voltage signal (U1) is carried out clamp.
3. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the sample circuit in this device (A1) contains a bleeder circuit or current-limiting circuit, bleeder circuit is formed by two divider resistance serial connections, its serial connection two ends are connected across on the arc-welding voltage sampling point through lead respectively, from the serial connection point output partial pressure value of two resistance; Current-limiting circuit by one, mutually two of serial connection or mutually many resistance of serial connection forms, it is used for V/I takes a sample, and promptly arc-welding voltage (U0) is become corresponding current signal.
4. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the division circuit in this device (A2) contains a divider integrated circuit.
5. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the division circuit in this device (A2) contains an integrated circuit that contains division function.
6. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the division circuit in this device (A2) contains a multiplier integrated circuit.
7. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the division circuit in this device (A2) is by multiplier integrated circuit (IC1), operational amplifier (IC2) connects with two resistance (R8 and R9) and forms, they are to connect like this: divisor is that arc voltage signal (U1) is imported from a multiplier input (X1), another multiplier input (Y1) is connected with operational amplifier (IC2) output, and output quotient (I1), the product output (W) of multiplier integrated circuit is connected through the inverting input of a resistance (R8) with operational amplifier (IC2), and arc power setting signal (P1) also is connected with the inverting input of operational amplifier (IC2) through another resistance (R9).
8. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the division circuit in this device (A2) contains a transconductance type operational amplifier.
9. according to the arc power control device of the described Arc Welding Power of claim 2, it is characterized in that: the clamp circuit of divisor (A31) is a kind of divisor clamp circuit of electric resistance partial pressure type in this device, it is connected in series mutually by two divider resistances and forms, this bleeder circuit is connected across burning voltage two ends, between partial pressure value and clamping voltage value differ the forward voltage drop value of a switching diode, diode is connected across on the transmission line of two resistance string contacts and divisor arc voltage signal (U1).
10. according to the arc power control device of the described Arc Welding Power of claim 2, it is characterized in that: the clamp circuit of divisor (A31) is a kind of divisor clamp circuit of voltage follow formula in this device, it contains an operational amplifier, diode and two resistance, operational amplifier and diode are formed follower circuit, its circuit connects: the output of operational amplifier is connected with a utmost point of diode, another utmost point of diode is connected with the inverting input of operational amplifier and divisor-signal transmission line, two resistance compose in series bleeder circuit mutually, be connected across on the burning voltage, its serial connection point is to operational amplifier in-phase end input clamp setting voltage (U2), from the clamping voltage of follower output divisor.
11. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the clamp circuit (A32) of quotient in this device (I1) contains two divider resistances, current-limiting resistance and a diode, current-limiting resistance is connected with a utmost point of diode, the other end of current-limiting resistance is connected with the quotient of division circuit (I1) output, two divider resistances are connected in series mutually, be connected across on the burning voltage, its serial connection point is connected with another utmost point of diode, serial connection point partial pressure value by two resistance provides relevant clamping voltage, partial pressure value and clamping voltage value differ a diode forward voltage drop value, export on the line of the quotient behind the clamp (I1) by current-limiting resistance and diode.
12. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the clamp circuit (A32) of quotient in this device (I1) contains a current-limiting resistance and a voltage-stabiliser tube, current-limiting resistance one end links to each other with quotient (I1) output of division circuit, the other end extremely links to each other with one of voltage-stabiliser tube, another utmost point of voltage-stabiliser tube inserts power supply ground, provide clamping voltage (U3) by voltage-stabiliser tube, export on the line of the quotient behind the clamp (I1) by resistance and voltage-stabiliser tube, voltage-stabiliser tube is Zener diode or integrated voltage-stabiliser tube.
13. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the clamp circuit (A32) of the quotient in this device (I1) contains operational amplifier, a diode, two divider resistances and current-limiting resistance, two divider resistances are connected in series mutually, be connected across on the burning voltage, its serial connection point provides the clamp setting voltage of this circuit quotient (I1) to the in-phase input end of operational amplifier, the output of operational amplifier is connected with an end of diode, the other end of diode is connected with the inverting input of operational amplifier, both form voltage follower, the inverting input of operational amplifier is connected with current-limiting resistance, the other end of current-limiting resistance is connected with the quotient of division circuit (I1) output, exports on the line of the quotient behind the clamp (I1) by the inverting input of current-limiting resistance and operational amplifier.
14. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the sample circuit in this device (A1) contains the non-linear transform circuit of an arc voltage signal (U1) for arc-welding voltage (U0), to realize the nonlinear transformation of arc-welding voltage (U0).
15. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the non-linear transform circuit of sample circuit in this device (A1) is in series by load resistance and diode, it is connected across the transmission line and the power supply ground of divisor, and diode is one, two or many and is in series.
16. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the non-linear transform circuit of sample circuit in this device (A1) is contained voltage-stabiliser tube and three resistance, its electrical connection is: first resistance and second resistance are connected with voltage-stabiliser tube one utmost point, the other end of first resistance inserts on the burning voltage, another termination divisor transmission line of second resistance, another utmost point ground connection of voltage-stabiliser tube, the 3rd resistance one termination divisor transmission line, other end ground connection, voltage-stabiliser tube are Zener diode or integrated voltage-stabiliser tube.
17. arc power control device according to the described Arc Welding Power of claim 2, it is characterized in that: the non-linear transform circuit of sample circuit in this device (A1) is contained operational amplifier and four resistance, the computing amplification appliance connects into voltage follower circuit, output is connected with second resistance and divisor transmission line through first resistance, the second resistance other end ground connection, the 3rd resistance and the 4th resistance are in series, be connected across on the burning voltage, its serial connection point provides a setting voltage to the operational amplifier in-phase end.
18. according to the described Arc Welding Power arc power of claim 2 control device, it is characterized in that: the non-linear sampling transform circuit of sample circuit in this device (A1) contains two operational amplifiers and two resistance, the first computing amplification appliance connects into voltage follower circuit, its in-phase end connects operational amplifier in-phase end in the voltage follower formula divisor clamp circuit, output is connected to the reversed-phase output of the second computing amplification appliance through first resistance, second resistance connects second computing amplification appliance inverting input and the output, arc voltage signal without conversion is imported from the second operational amplifier in-phase end, by the arc voltage signal (U1) of its output output after nonlinear transformation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005101293443A CN1978114B (en) | 2005-11-30 | 2005-11-30 | Electric-arc power control method for arc-welding power supply and apparatus |
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| CN2005101293443A CN1978114B (en) | 2005-11-30 | 2005-11-30 | Electric-arc power control method for arc-welding power supply and apparatus |
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| CN1978114B true CN1978114B (en) | 2011-03-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100493802C (en) * | 2007-07-27 | 2009-06-03 | 北京工业大学 | Power supply control system for inversion arc welding |
| US10207351B2 (en) * | 2013-03-15 | 2019-02-19 | Illinois Tool Works Inc. | Method and apparatus for providing welding power |
| CN105965125A (en) * | 2016-04-30 | 2016-09-28 | 苏州亿欧得电子有限公司 | Welding method of reed and connecting rod wire, arc discharge welding equipment and control circuit |
| CN113878227A (en) * | 2021-09-27 | 2022-01-04 | 深圳市联赢激光股份有限公司 | Intelligent welding method, intelligent welding system and computer storage medium |
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