CN103212770A - Welding power supply device - Google Patents
Welding power supply device Download PDFInfo
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- CN103212770A CN103212770A CN2012105765405A CN201210576540A CN103212770A CN 103212770 A CN103212770 A CN 103212770A CN 2012105765405 A CN2012105765405 A CN 2012105765405A CN 201210576540 A CN201210576540 A CN 201210576540A CN 103212770 A CN103212770 A CN 103212770A
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Abstract
The invention provides a welding power supply device which can easily determine whether circuit parameters used for calculation of front end voltage are in a suitable scope in real time when welding control is based on the electrode front voltage. A control device (31) (a processing part 32) calculates the front end voltages used for inverse operation in dependence on secondary side inner voltage (V0), external resistance value and inductance and inner resistance value and inductance and perform output voltage inverse operation in dependence on calculated front end voltage. In addition, the welding power supply device compared output voltage after inverse operation and the detected output voltage (V1) and determines whether external resistance value and inductance stored in a storage device (32) are in a tolerance range.
Description
Technical field
The present invention relates to following welding supply unit: when generation is used for using power supply with the welding that the electric arc that produces from the electrode front end welds, implement FEEDBACK CONTROL based on the calculating of terminal voltage before the electrode.
Background technology
Arc welding for example constitutes shown in the patent documentation 1 with supply unit, the direct current power that will carry out rectification to the interchange input electric power from source power supply and obtain is transformed to high-frequency ac electric power by inverter circuit, and will carry out the adjusted high-frequency ac electric power of voltage is transformed to suitable arc welding by rectification circuit and direct current reactor direct current output power by welding transformer.The output power that is generated by supply unit is provided for the electrode that is supported by welding torch, produces electric arc thus between electrode front end and welding object, carries out the welding of welding object.
In addition, the detection of output current and output voltage is carried out in such welding with the control device of supply unit, control device will constantly detected output current and output voltage feed back to PWM (pulse width modulation) control of inverter circuit at each, and implement to be somebody's turn to do the control that each output power constantly is set at appropriate value, thereby realize the raising of welding performance.
The prior art document
Patent documentation
Patent documentation 1: the special fair 7-115183 communique of Japan Patent
Summary of the invention
The technical problem that invention will solve
, realize the further raising of welding performance, make the output voltage that detects in the supply unit be reflected in the controlling value of inverter circuit with it, more preferably make the preceding terminal voltage of the electrode that produces electric arc be reflected in controlling value in order to produce suitable electric arc.
This be because on the circuit between welding torch (electrode) and the supply unit mainly in power cable, have the variation in voltage amount due to the inductance value of the resistance value of this cable length influence or any intermediate position (straight-run or pitch of the laps lay, its pitch of the laps number) influence.Therefore, in the control that comes inverter circuit is carried out based on the output voltage that in supply unit, detects, the preferred voltage of terminal voltage when being target with the raising welding performance is different before actual, if calculate before the electrode terminal voltage and be used for control so detected output voltage in supply unit has been proofreaied and correct previous variation in voltage amount, then can further improve welding performance.
When the calculating of so preceding terminal voltage, need in supply unit, preserve with welding torch (electrode) or supply unit be configured such that the time spent state is set the time mainly be resistance value or the inductance value that power cable relates to.And when change after this was provided with state or change power cable, current resistance value or inductance value were different with interior resistance value or the inductance value of being preserved of supply unit.In addition, cable moves such situation etc. in the welding of rectangular works, and the resistance value or the inductance value of being preserved in the resistance value in each moment or inductance value and the supply unit there are differences.
In a word, expectation be based upon the unclear circuit parameter of preserving of operator be in the reasonable scope or scope when outer easily and the gimmick of suitably judging.
The present invention finishes in order to solve above-mentioned problem, its objective is the welding supply unit that provides following: when terminal voltage is welded control before based on electrode, can easily and judge suitably whether the circuit parameter of the calculating that is used for this preceding terminal voltage is in zone of reasonableness.
Be used to solve the means of problem
In order to solve above-mentioned problem, the invention of the first aspect of the application's record is that supply unit is used in welding, and this welding has with supply unit: inverter circuit is transformed to high-frequency ac electric power with direct current power; Transformer carries out the voltage adjustment of the alternating electromotive force after the conversion; And DC transfer circuit, primary side alternating electromotive force according to this transformer, generation is used for the direct current output power of arc welding, this welding uses supply unit via power cable, provide output power from the lead-out terminal of supply unit to the electrode of bonding machine, and from electrode front end generation electric arc, this welding has with supply unit: detecting unit, detect from the output current and the output voltage of described lead-out terminal output; Preserve the unit, preserve resistance value and inductance value between described lead-out terminal and the described electrode; Front end voltage computing unit, use described detected output current and output voltage, calculate the outside resistance value and the voltage variety of inductance value from described lead-out terminal, and, calculate the preceding terminal voltage of described electrode according to voltage variety that calculates and described detected output voltage; And control module, control described inverter circuit based on the described preceding terminal voltage that calculates, this welding is characterized in that having with supply unit: second detecting unit, with respect to described detecting unit as first detecting unit, detect the primary side builtin voltage of described supply unit; The output voltage computing unit, preserve resistance value and the inductance value that plays the inside till the described lead-out terminal from the measurement point of described primary side builtin voltage in advance by described preservation unit, calculate the preceding terminal voltage that inverse operation is used according to the resistance value of described primary side builtin voltage, described outside and the resistance value and the inductance value of inductance value and described inside, and come output voltage is carried out inverse operation according to the preceding terminal voltage that this calculates; And judging unit, output voltage after the described inverse operation and described detected output voltage are compared, and carry out the resistance value of outside of described preservation and the judgement whether inductance value is in permissible range.
In the present invention, according to the primary side builtin voltage of obtaining respectively, outside resistance value and inductance value, and inner resistance value and inductance value calculate the preceding terminal voltage that inverse operation is used, and carry out the inverse operation of output voltage according to the preceding terminal voltage that calculates.And, output voltage after the inverse operation and detected output voltage are compared, and judge by the resistance value and the inductance value of preserving the outside of preserving the unit whether be in permissible range.That is because the obtaining easily and judge that related comparison (computing) is simple of each parameter, so can be easily and the appropriate value of resistance value of suitably having preserved and inductance judge.And, be judged as under the situation about being in outside the permissible range in the resistance value and the inductance value of the outside of having preserved, if for example implemented the improvement of the situation that is provided with of notice or parameter correction etc., then can help the good welding performance of stable performance.
Its purport of invention of the second aspect of the application's record is: the welding in first aspect invention record is used in the supply unit, possess: notification unit, in described judgment unit judges is that the resistance value of described outside of having preserved and inductance value are under the situation outside the permissible range, is used for carrying out to the operator notice of this meaning.
In the present invention, be judged as when being in outside the permissible range in the resistance value of the outside of having preserved and inductance value, because the operator is carried out the notice of this meaning, so can make the operator discern this meaning.
Its purport of invention in the third aspect of the application record is, welding in first aspect invention or second aspect invention record is used in the supply unit, possess: automatic amending unit, be that the resistance value of described outside of having preserved and inductance value are under the situation outside the permissible range by described judgment unit judges, based on the comparison of output voltage after the described inverse operation and described detected output voltage, carry out the calculating and the renewal thereof of the correction value of the resistance value of described outside of having preserved and inductance value.
In the present invention, the resistance value of the outside of having preserved and inductance value are judged as the following time of situation that is in outside the permissible range, carry out the calculating and the renewal of the correction value of outside resistance value and inductance value.Thus, because resistance value and inductance value are updated to suitable value,, can alleviate the required operator's of the correction of this resistance value and inductance value burden in addition so can help the raising of welding performance.
Its purport of invention in the fourth aspect of the application record is, with in the supply unit, based on operator's operation, carries out the correction of the resistance value and the inductance value of described outside of having preserved in the welding of second aspect invention record.
In the present invention because the resistance value of the outside of having preserved and inductance value can carry out manual correction by the operator, so resistance value externally and inductance value are judged as and are in the outer situation of permissible range etc. and can carry out the adjustment of two values.In addition, can also make welding performance reflect operator's hobby.
The application record the 5th aspect its purport of invention be, welding in third aspect invention or fourth aspect invention record is used in the supply unit, have: mode switch element, be that the resistance value of described outside of having preserved and inductance value are under the situation outside the permissible range by described judgment unit judges, can switching to modification model and need not in the middle of the modification model any one.
In the present invention, because can switch to the resistance value of the outside of having preserved and modification model that inductance value is revised and need not in the middle of the modification model any one, so the switching that can whether revise according to operator's hobby.
The application record the 6th aspect its purport of invention be, welding in a second aspect of the present invention record has with supply unit: automatic amending unit, be that the resistance value of described outside of having preserved and inductance value are under the situation outside the permissible range by described judgment unit judges, based on comparison, carry out the calculating and the renewal of the correction value of the resistance value of described outside of having preserved and inductance value to output voltage after the described inverse operation and described detected output voltage; And manual correction unit, carry out the correction of the resistance value and the inductance value of described outside of having preserved based on operator's operation, also have: mode switch element, be that the resistance value of described outside of having preserved and inductance value are under the situation outside the permissible range by described judgment unit judges, can switching to automatic modification model, manual correction pattern and need not in the middle of the modification model any one.
In the present invention, because can switch to automatic modification model, the manual correction pattern of manually revising that the correction of the resistance value of the outside of will preserve and inductance value carries out automatically and need not in the middle of the modification model any one, so can switch to according to operator's hobby automatically, manual correction or do not revise.
Its purport of invention in record aspect the application the 7th is, second aspect invention and be subordinated to the second aspect invention the 3rd～the 6th aspect the welding of any one record in the invention with in the supply unit, have: notice has or not switch unit, the notice of described notification unit is had or not switch.
In the present invention, because the notice of energy switching notice unit has or not, so can carry out its switching according to operator's hobby.
The invention effect
According to the present invention, following welding supply unit can be provided: terminal voltage is welded in the control before based on electrode, can be easily and suitably judge and be used for circuit parameter that this front end voltage calculates whether in proper range.
Description of drawings
Fig. 1 is the summary pie graph of the supply unit of arc welding machine.
Fig. 2 is the key diagram of the computational methods of the circuit parameter of terminal voltage before the relevant voltage.
Fig. 3 illustrates the oscillogram that the electric current in the welding changes.
Fig. 4 is the key diagram of the modification method of circuit parameter.
Fig. 5 is the key diagram of the modification method of circuit parameter.
Label declaration
10 bonding machines
11 welding supply units
The 11a lead-out terminal
The 11b lead-out terminal
12 electrodes
14 power cables
21 rectifier smoothing circuits
22 inverter circuits
23 transformers
24 rectification circuits (DC transfer circuit)
25 direct current reactors (DC transfer circuit)
26 current sensors (detecting unit, first detecting unit)
27 voltage sensors (detecting unit, first detecting unit)
28 voltage sensors (second detecting unit)
31 control device (front end voltage computing unit, control module, output voltage computing unit, judging unit, automatic amending unit)
32 handling parts
32a memory (preservation unit)
33 warning devices (notification unit, notice have or not switch unit)
34 adjustment parts (manual correction unit)
35 pattern switching parts (mode switch element)
The I output current
La inductance value (outside)
Lb inductance value (correction value)
Lin inductance value (inside)
Ra resistance value (outside)
Rb resistance value (correction value)
Rin resistance value (inside)
V0 primary side builtin voltage
V1 output voltage (detection)
V
A+LROutput voltage (inverse operation)
Terminal voltage before the Va
Terminal voltage before the Va1 (inverse operation is used)
The specific embodiment
Below, with reference to the accompanying drawings embodiment that the present invention has been specialized is described.
As shown in Figure 1, the arc welding machine 10 of self-consuming electrode type has the welding supply unit 11 that the direct current output power that is used for arc welding is generated.Welding is connected with the silk electrode 12 that is supported by welding torch TH with supply unit 11 at side of the positive electrode lead-out terminal 11a, negative side lead-out terminal 11b at this supply unit 11 is connected with welding object M, thereby carries out arc welding by being powered to silk electrode 12 by the direct current output power that this supply unit 11 generates.At this moment, silk electrode 12 is because consume when welding, so supplied with according to consuming by silk feedway 13.Via silk electrode 12 and welding object M being supplied with output power with the lead-out terminal 11a of supply unit 11, the power cable 14 that 11b is connected.
The interchange input power converter of the three-phase that welding will be supplied with from source power supply with supply unit 11 is the direct current output power of suitable arc welding.Exchange input electric power and be transformed to direct current power by the rectifier smoothing circuit 21 that is made of diode bridge and smmothing capacitor, the direct current power after the conversion is transformed to high-frequency ac electric power by inverter circuit 22.Inverter circuit 22 is made of the bridge circuit of the switch element TR that has used 4 IGBT etc., implements the PWM control of control device 31.
The high-frequency ac electric power that inverter circuit 22 is generated is transformed to the primary side alternating electromotive force that is adjusted into the assigned voltage value by welding transformer 23.The primary side alternating electromotive force of welding transformer 23 is transformed to the direct current output power that is fit to arc welding by rectification circuit 24 that has used diode and direct current reactor 25.
The switch element TR of 31 pairs of inverter circuits 22 of control device implements PWM control, carries out the direct current output power is set at the control of appropriate value constantly at each.
In the supply unit 11 of present embodiment, at first have and be used to detect from the output current I of lead-out terminal 11a, 11b output and the current sensor 26 and the voltage sensor 27 of output voltage V 1.The handling part 32 of control device 31 detects the output current I of supply unit 11 based on the output signal of current sensor 26, and detects voltage (output voltage V 1) between lead-out terminal 11a, the 11b based on the output signal of voltage sensor 27.In addition, have the voltage sensor 28 of the primary side builtin voltage V0 that is used to detect transformer 23, the handling part 32 of control device 31 also carries out the detection of the primary side builtin voltage V0 of transformer 23 based on the output signal of voltage sensor 28.What deserves to be mentioned is, as the primary side builtin voltage V0 of transformer 23, the voltage after using secondary side coil voltage transformation with transformer 23 as D. C. value or the secondary side coil voltage of transformer 23 is carried out the voltage that direct currentization forms by rectification circuit 24.And the control device 31 of present embodiment (handling part 32) uses at each electric current I that detects constantly and voltage V1, V0, carries out the calculating of the dutycycle of PWM control, and generates the pwm control signal that outputs to inverter circuit 22.
Here, for the preferred preceding terminal voltage Va that uses the silk electrode 12 that electric arc will produce of PWM control, but the direct detection of preceding terminal voltage Va is difficult.Therefore, 31 pairs of control device each constantly detected output voltage V 1 carry out the correction of the voltage variety 12 and terminal voltage Va obtaining before from lead-out terminal 11a, 11b to electrode, and implement to have used the PWM of the preceding terminal voltage Va that calculates to control.
To the voltage variety the electrode 12, is that lead-out terminal 11a, 11b from supply unit 11 plays via resistance value Ra till electrode 12 front ends of power cable 14 and the voltage variety due to the inductance value La from lead-out terminal 11a, the 11b of supply unit 11.The voltage variety of the outside of supply unit 11, because of when initial setting up or when change is set and use in the moving etc. of power cable 14 due to the cable length of power cable 14 or the condition difference of any intermediate position (straight-run or pitch of the laps lay, its pitch of the laps number) etc., especially the influence of the variation of inductance value La is big to be subjected to resistance value Ra.
Therefore, the supply unit 11 of present embodiment is actually used in the bond pattern that carries out the welding of workpiece except having, and also has the measurement pattern that resistance value Ra and inductance value La to the outside measure.The switching of bond pattern and measurement pattern is 11 that had based on supply unit, the operations of for example console switch (omitting diagram) are carried out.Resistance value Ra that measures and inductance value La are stored among the interior memory 32a of control device 31 (handling part 32).In addition, resistance value Ra not only obtains by measuring, and also the resistance value of the power cable 14 that can will use by the numerical value input obtains, and also can obtain according to the input of the model of power cable 14, cable information (cable length and sectional area) etc.In this case, can also omit the measurement of resistance value Ra.
When being elaborated for measurement pattern, control device 31 (handling part 32) uses the special-purpose current waveform of measurement as shown in Figure 2 to carry out.When measuring, need make the load-side short circuit, but also can replace this electrode 12 and make the contact THa short circuit (with reference to Fig. 1) of the welding torch TH that powers to electrode 12.
In order to begin to measure, at first control device 31 moves inverter circuit 22, as shown in Figure 2, makes output current I increase to current value I p.Then, control device 31 makes the current value I p of output current I to keep constant specified time limit, calculates the average voltage level Ve in output voltage V 1 during this period.And control device 31 is according to following formula (a) calculated resistance value Ra (with reference to Fig. 4).
Ra＝Ve/Ip…(a)
The resistance value Ra that control device 31 calculates in the memory 32a of handling part 32 storage.
Then, control device 31 stops the action of inverter circuit 22, and picks up counting from the moment T0 of this moment.The output current I that 31 pairs of control device change all the time sample, and will reach the moment that becomes the current value Δ of the current attenuation amount that meets time constant Ip (=Ip * 36.8%) to be made as T1, obtain time (time constant) τ between this moment T1-T0.And control device 31 calculates inductance value La (with reference to Fig. 4) according to following formula (b).
La＝Ra×τ(＝Ve×τ/Ip)…(b)
The inductance value La that control device 31 calculates in the memory 32a of handling part 32 storage.Like this, obtain current resistance value Ra and inductance value La, and be kept in the control device 31.It more than is measurement pattern.
And control device 31 is when the welding action, and resistance value Ra that use is preserved and inductance value La and each be detected output current I and output voltage V 1 constantly, calculates the preceding terminal voltage Va of electrode 12 according to following formula (c).
Va＝V1-La×dI/dt-Ra×I…(c)
The PWM that control device 31 is implemented to have used at each preceding terminal voltage Va that calculates constantly controls.Because in preceding terminal voltage Va, reflected to comprise the voltage variety that current power cable 14 any intermediate position relate at the welding surroundings of interior current bonding machine 10, so can generate the output power that is more suitable for welding.
; state under the situation that change is set of having carried out bonding machine 10 after measuring on the implementation or in use power cable 14 situation about moving is inferior, whether resistance value Ra that has preserved in control device 31 or inductance value La may become suspicious situation in the reasonable scope.Therefore, the control device 31 of present embodiment constitutes: under the resistance value Ra that has preserved or inductance value La become situation outside the zone of reasonableness, based on 33 couples of operators' of warning device notice, can carry out the correction of resistance value Ra and inductance value La.
At first, control device 31 as shown in Figure 4, use is by the resistance value Rin and the inductance value Lin of device 31 inside of the primary side of the primary side builtin voltage V0 of voltage sensor 28 detected transformers 23, transformer 23, and terminal voltage Va before not using the output voltage V 1 of actual measurement to calculate.Here the resistance value Rin of the inside of Shi Yonging and inductance value Lin, saying so exactly and play internal resistance value and internal inductance value till lead-out terminal 11a, the 11b from the measurement point of primary side builtin voltage V0, is at the eigenvalue of welding with supply unit 11 basically.Inner resistance value Rin and inductance value Lin obtain by actual measurement in advance or calculating, and are kept in advance among the memory 32a of control device 31 (handling part 32).And,, when the output voltage V 1 of not using actual measurement is calculated the preceding terminal voltage Va1 of electrode 12, become following formula according to following formula (d).
Va1＝V0-(Lin+La)×dI/dt-(Rin+Ra)×I…(d)
Then, control device 31 calculates from the preceding terminal voltage Va1 that is calculated by following formula (d) according to following formula (e) and carries out the output voltage V that inverse operation obtains
A+LR
V
a+LR＝Va1+La×dI/dt+Ra×I…(e)
Then, 31 pairs of output voltage V that obtain through inverse operation of control device
A+LRCompare with the output voltage V 1 of actual measurement.Use following formula (f),
|V
a+LR-V1|＞k…(f)
In output voltage V
A+LRSurpass with the absolute value of the difference of output voltage V 1 and to allow under the situation of judgment value k that control device 31 is judged as the resistance value Ra and the inductance value La that self preserve and is in outside the zone of reasonableness.In addition, allow that judgment value k can sense of reality to the welding situation magnitude of voltage that changes take place, and for example is set to about 1～2 volt.
The appropriate value of such resistance value Ra and inductance value La is judged, is carried out when the load short circuits state.In the arc welding of self-consuming electrode type, in actual welding, as shown in Figure 3, be alternately repeated with arc period during the short circuit, judge but during this short circuit, carry out appropriate value.If be judged as resistance value Ra and inductance value La is in outside the zone of reasonableness, then control device 31 makes warning device 33 work, and notifies this meaning to the operator.The operator can accept this abnormity notifying, the affirmation of the power cable that using before the trade of going forward side by side 14 self and the affirmation of its any intermediate position etc.In addition, under the situation of the automatic corrective action that carries out resistance value Ra as described later and inductance value La, be the notice of this meaning, in addition, under the situation of carrying out the manual correction action, also impel the operator to carry out this correction operation.
Then, automatic correction about this resistance value Ra and inductance value La, electric current during the short circuit as shown in Figure 3 changes like that, the constant rising control of output current I when control device 31 carries out short circuit usually, therefore especially during constant variation stably among (correction value computing interval) Ta, the automatic correction of resistance value Ra and inductance value La becomes easy.
Here, if during short circuit in correction value computing interval Ta in output voltage V
A+LRBe replaced into simple equation with the voltage rising of output voltage V 1, then can be expressed as following formula (g), (h).
Output voltage V
A+LRVoltage ascending manner y
1=a
1x
1+ b
1(g)
The voltage equation y of output voltage V 1
0=a
0x
0+ b
0(h)
Output voltage V
A+LRThe expression of first degree y that rises with the voltage of output voltage V 1
1, y
0As shown in Figure 5.Among the correction value computing interval Ta in during short circuit, the electric current of unit interval rises and to become constantly, so the voltage change (LdI/dt) that inductance brings is fixed value, is the intercept b of above-mentioned formula once.In addition, about the slope of above-mentioned expression of first degree because during Ta during short circuit in, so there is resistance variations hardly, so resistance R reaches slope a.X is output current I.
And, by the resulting output voltage V of inverse operation
A+LRVoltage ascending manner y
1Voltage ascending manner y with respect to the output voltage V 1 of surveying
0Under the approaching situation, mean that the resistance value Ra and the inductance value La that are preserved in the control device 31 are approximately appropriate value.Relative therewith, in output voltage V
A+LRVoltage ascending manner y
1Voltage ascending manner y with respect to the output voltage V 1 of surveying
0Under the widely different situation, mean one among resistance value Ra and the inductance value La, or its both and appropriate value depart from greatly.In other words, if resistance value Ra and inductance value La are modified to appropriate value, output voltage V then
A+LRVoltage ascending manner y1 can be approximately the voltage ascending manner y of the output voltage V 1 of actual measurement
0
Therefore, as revising step 1, at first make output voltage V
A+LRVoltage ascending manner y
1Slope a
1Voltage ascending manner y with the output voltage V 1 of surveying
0Slope a
0Consistent.That is, because slope is equivalent to resistance value, so new resistance value Rb can calculate according to following formula (i).
Rb＝a
0/a
1×Ra…(i)
Then, as revising step 2, make output voltage V
A+LRVoltage ascending manner y
1Intercept b
1Voltage ascending manner y with the output voltage V 1 of surveying
0Intercept b
0Consistent.That is, because intercept is equivalent to inductance value, so new inductance value Lb can calculate according to following formula (j).
Lb＝b
0/b
1×La…(j)
Therefore, the control device 31 of present embodiment (handling part 32) is implemented above-mentioned calculating, and the new resistance value Rb that will calculate and inductance value Lb be as correction value, carries out the resistance value Ra that preserved in the control device 31 and the rewriting of inductance value La.Control device 31 uses interior resistance value Ra and the inductance value La of zone of reasonableness after upgrading like this, carries out the calculating of the preceding terminal voltage Va of electrode 12.That is, can carry out the calculating of preceding terminal voltage Va accurately.In addition, the renewal of resistance value Ra and inductance value La also can be according to carrying out during each short circuit, even or be not during having vacated the short circuit of predetermined distance during each short circuit and according to each, to carry out, also can expect to obtain effect of sufficient.Consequently, even welding surroundings also can play consistently good welding performance according to situation being set or action changes.
Then, the distinctive effect of notebook embodiment.
(1) control device 31 (handling part 32) calculates the preceding terminal voltage Va1 that is used for inverse operation according to primary side builtin voltage V0, outside resistance value Ra and inductance value La, inner resistance value Rin and inductance value Lin, carries out output voltage V according to this preceding terminal voltage Va1 that calculates
A+LRInverse operation.And, to the output voltage V after the inverse operation
A+LRCompare with detected output voltage V 1, whether the resistance value Ra and the inductance value La that carry out the outside of preserving among the memory 32a are the judgement of permissible range.Just because the obtaining easily and judge that the computing that relates to is simple of each parameter, so can be easily and the appropriate value of the resistance value Ra of the outside of suitably having preserved and inductance value La judge.And, under the resistance value Ra that is judged as the outside of having preserved and inductance value La are in situation outside the permissible range,, can play consistently good welding performance by as present embodiment, implementing the parameter correction.
(2) when the resistance value Ra that is judged as the outside of having preserved and inductance value La are in outside the permissible range, control device 31 makes warning device 33 work, the operator is carried out the notice of this meaning.Therefore, can make the operator discern this meaning, and can impel the improvement of the situation of setting.
(3) when the resistance value Ra that is judged as the outside of having preserved and inductance value La are in outside the permissible range, control device 31 carries out outside resistance value Ra and correction value (Rb, calculating Lb) and the renewal thereof of inductance value La.Thus, so, can alleviate the operator's that correction caused of this resistance value Ra and inductance value La burden in addition because resistance value Ra and inductance value La are updated to the raising that appropriate value helps welding performance.
In addition, embodiments of the present invention also can change as follows.
Although had the measurement pattern of the measurement of carrying out outside resistance value Ra and inductance value La, also can not have measurement pattern.If for example be set in resistance value Ra and inductance value La, import the form that from then on initial value is also revised in advance, then do not need measurement pattern.
Although be made as the mode of the automatic correction of the resistance value Ra that carries out the outside of being preserved among the memory 32a and inductance value La, also can be made as have can by operator's manual operation carry out resistance value Ra and inductance value La adjustment adjustment part 34 (with reference to Fig. 1) thus can carry out the mode of manual correction.In this manual correction, can also make welding performance reflect operator's hobby.
In addition, both can have automatic correction, manual correction the two, can also have pattern switching part 35 (with reference to Fig. 1), it carries out the switching of automatic modification model and manual correction pattern, and then also adds and need not modification model and carry out switching to each pattern.What deserves to be mentioned is, can consider the switching of switching, the automatic/hand modification model of 3 patterns, automatically modification model with need not switching, the manual correction pattern of modification model and need not the such combination of switching of modification model.So, can revise or not revise according to operator's hobby, in addition, even under situation about revising, also can carry out the switching of automatic/hand etc.
Although being under the situation outside the permissible range, the resistance value Ra of the outside of being preserved in being judged as memory 32a and inductance value La notify by warning device 33, but for example also can not notify this meaning revising automatically etc. under the situation, can omit warning device 33 in this case.In addition, also can be set to the changeable mode that has or not based on the notice of warning device 33, for example be sick of to notify to be made as under such situation and obstructedly know etc., can switch according to operator's hobby the operator.
Welding constitutes a just example with the circuit of supply unit 11, can suitably change.For example, exchange input although have current rectifying and wave filtering circuit 21 at input part with correspondence, the circuit that also can be set to the input part corresponding with the direct current input constitutes.In addition, although used rectification circuit 24 and direct current reactor 25 to be used as the DC transfer circuit of the primary side of transformer 23, also can use other DC transfer circuit.
Claims (7)
1. welding supply unit, have: inverter circuit is transformed to high-frequency ac electric power with direct current power; Transformer carries out the voltage adjustment of the alternating electromotive force after the conversion; And DC transfer circuit, according to the primary side alternating electromotive force of this transformer, generate the direct current output power that is used for arc welding,
Described welding provides output power from the lead-out terminal of supply unit to the electrode of bonding machine via power cable with supply unit, and generates electric arc from the electrode front end,
Described welding has with supply unit:
Detecting unit detects from the output current and the output voltage of described lead-out terminal output;
Preserve the unit, preserve resistance value and inductance value between described lead-out terminal and the described electrode;
Front end voltage computing unit, use detected described output current and output voltage, calculate the outside resistance value and the voltage variety of inductance value from described lead-out terminal,, calculate the preceding terminal voltage of described electrode according to voltage variety that calculates and detected described output voltage; And
Control module is controlled described inverter circuit based on the described preceding terminal voltage that calculates,
Described welding is characterised in that to have with supply unit:
Second detecting unit, with respect to described detecting unit as first detecting unit, detect the primary side builtin voltage of described supply unit;
The output voltage computing unit, preserve resistance value and the inductance value that plays the inside till the described lead-out terminal from the measurement point of described primary side builtin voltage in advance by described preservation unit, calculate the preceding terminal voltage that inverse operation is used according to the resistance value of described primary side builtin voltage, described outside and the resistance value and the inductance value of inductance value and described inside, and should preceding terminal voltage carry out inverse operation output voltage according to what calculate; And
Judging unit compares described output voltage after the inverse operation and detected described output voltage, and judges whether the resistance value and the inductance value of the described outside of having preserved are in permissible range.
2. welding supply unit as claimed in claim 1 is characterized in that,
Have: notification unit is used for carrying out the notice of this meaning to the operator described judgment unit judges is in situation outside the permissible range for the resistance value of the described outside of having preserved and inductance value under.
3. welding supply unit as claimed in claim 1 or 2 is characterized in that,
Have: automatic amending unit, under situation about being in for the resistance value of the described outside of having preserved and inductance value by described judgment unit judges outside the permissible range, based on the described output voltage after the inverse operation and the comparison of detected described output voltage, calculate the correction value and the renewal of the resistance value and the inductance value of the described outside of having preserved.
4. welding supply unit as claimed in claim 2 is characterized in that,
Have: the manual correction unit, based on operator's operation, revise the resistance value and the inductance value of the described outside of having preserved.
5. as claim 3 or 4 described welding supply units, it is characterized in that,
Have: mode switch element under situation about being in for the resistance value of the described outside of having preserved and inductance value by described judgment unit judges permissible range outside, can switch to modification model and need not central any one of modification model.
6. welding supply unit as claimed in claim 2 is characterized in that,
Have: automatic amending unit, under situation about being in for the resistance value of the described outside of having preserved and inductance value by described judgment unit judges outside the permissible range, based on to the described output voltage after the inverse operation and the comparison of detected described output voltage, calculate the correction value and the renewal of the resistance value and the inductance value of the described outside of having preserved;
The resistance value and the inductance value of the described outside of having preserved are revised in the manual correction unit based on operator's operation; And
Mode switch element under situation about being in for the resistance value of the described outside of having preserved and inductance value by described judgment unit judges permissible range outside, can switch to automatic modification model, manual correction pattern and need not central any one of modification model.
7. as claim 2 and be subordinated to any described welding supply unit in the claim 3～6 of claim 2, it is characterized in that,
Have: notice has or not switch unit, the notice of described notification unit is had or not switch.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-010468 | 2012-01-20 | ||
| JP2012010468A JP5868712B2 (en) | 2012-01-20 | 2012-01-20 | Power supply for welding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103212770A true CN103212770A (en) | 2013-07-24 |
| CN103212770B CN103212770B (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210576540.5A Active CN103212770B (en) | 2012-01-20 | 2012-12-26 | Welding supply unit |
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| Country | Link |
|---|---|
| JP (1) | JP5868712B2 (en) |
| CN (1) | CN103212770B (en) |
Cited By (2)
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| CN107520524A (en) * | 2017-09-13 | 2017-12-29 | 严春玲 | Electrical signal collection method in melt pole electrical arc welding |
| CN113000983A (en) * | 2019-12-18 | 2021-06-22 | 发那科株式会社 | Arc welding robot system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11027358B2 (en) | 2018-08-31 | 2021-06-08 | Illinois Tool Works | Systems and methods for auto-tuning a GMAW welding process |
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Also Published As
| Publication number | Publication date |
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| JP2013146772A (en) | 2013-08-01 |
| JP5868712B2 (en) | 2016-02-24 |
| CN103212770B (en) | 2016-06-01 |
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