CN102615386B - Power supply device for welding and welding machine - Google Patents
Power supply device for welding and welding machine Download PDFInfo
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- CN102615386B CN102615386B CN201210020045.6A CN201210020045A CN102615386B CN 102615386 B CN102615386 B CN 102615386B CN 201210020045 A CN201210020045 A CN 201210020045A CN 102615386 B CN102615386 B CN 102615386B
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Abstract
The invention provides a power supply device for welding and a welding machine. In the measuring mode of determining total resistance value R and total inductance value L to the front end of the electrode (12) related to the calculation of front end voltage, storing the suitable ranges of the resistance value and inductance of the power cable (14) used upon the main circuit between the power supply device (11) and the electrode (12) in a storage apparatus (35). The processing portion (32) of a control apparatus (31), based on the proper ranges of the resistance value and inductance value of the using cable (14), determines whether the obtained resistance value R and inductance value L are within the proper ranges or not.
Description
Technical field
The present invention relates to and implement the welding supply unit of FEEDBACK CONTROL according to the calculating of electrode front voltage and possess the bonding machine of this welding supply unit.
Background technology
Arc welding with supply unit such as Patent Document 1, be configured to: pass through inverter circuit, be high-frequency alternating current by having carried out the DC power conversion after rectification to the AC input power from source power supply, by rectification circuit and direct current reactor, the high-frequency alternating current after having carried out Voltage Cortrol by welding transformer is transformed to the DC output power being suitable for arc welding.The output power generated by supply unit is fed into the electrode supported by welding torch, produces electric arc thus between electrode front end and welding object, carries out the welding of welding object.
In addition, this welding supply unit carries out the detection of output current and output voltage, the PWM that the output current detected constantly and output voltage are fed back to inverter circuit by control device controls, and implements to make output power constantly become the control of appropriate value, improves welding performance.
Patent document 1:JP Unexamined Patent 8-103868 publication
But, in order to produce suitable electric arc, preferably not only the output voltage detected in supply unit is reflected to the controlling value of inverter circuit, also calculates the front voltage of the electrode correctly producing this electric arc, the electrode front voltage calculated is reflected to controlling value.
Because the welding torch (electrode) in fact carrying out welding is more with situation about being separated between supply unit, the form connected via power cable (power cable) is between the two general use form.Therefore, the cable length of power cable is different because of each user, so the resistance value of cable itself is different, and according to any intermediate position of cable, lay in a few week if such as reeled by additional length, then according to the difference of the situation of laying point-blank or winding number, inductance value is also different.Therefore, in order to realize the further raising of welding performance, the resistance between the electrode can not ignoring the supply unit outside comprising power cable and the variation in voltage amount of inductance.
Therefore, in the mode of the controlling value output voltage detected in supply unit being reflected to inverter circuit, following worry can be produced: the magnitude of voltage deviated from real electrode front voltage is reflected to the controlling value of inverter circuit, this can hinder and produce suitable electric arc, hinders the further raising of welding performance.
In addition, judge whether each measured value of the resistance value that the calculating that can measure electrode front voltage accurately uses and inductance value, namely enablely measured value is measured accurately, whether suitable about the original power cable used itself, the well-formedness of the power cable whether any intermediate position well waits, is difficult to judge.Therefore, skilled operators is required that carrying out these judges to there is room for improvement in operating efficiency.
Summary of the invention
The present invention makes to solve above-mentioned problem, the quality that its object is to the measured value of resistance value and the inductance value providing a kind of calculating easily carrying out electrode front voltage to use judge and the well-formedness judgement of power cable that main circuit uses etc. welding supply unit and possess the bonding machine of this welding supply unit.
In order to solve above-mentioned problem, invention described in technical scheme 1 is a kind of welding supply unit, it possesses DC power conversion is the inverter circuit of high-frequency alternating current, the welding transformer of the Voltage Cortrol of the alternating current after converting, the DC converting mechanism being suitable for the DC output power welded is generated with the secondary side alternating current according to this welding transformer, it also possesses control device, this control device between welding object, is used in the supply of electrode the device that weld electric arc produces based on generated described output power, and the front voltage of described electrode is calculated based on the output current detected with the testing agency in supply unit by this welding and output voltage, described inverter circuit is controlled based on the front voltage calculated, wherein, described control device has the mode determination performing the process comprising resistance value calculating mechanism and inductance value calculation mechanism, and possess front voltage and calculate mechanism, described resistance value calculates mechanism and described electrode is set to short-circuit condition and processes, the magnitude of voltage of described output voltage when being set to rated current value based on the described output current action by described inverter circuit produced, calculate the total resistance value on the path till described electrode front end, described electrode is set to short-circuit condition and processes by described inductance value calculation mechanism, current attenuation amount when being set as rated current value based on the described output current action by described inverter circuit produced, calculate the total inductance value on the path till described electrode front end, described front voltage calculates mechanism's voltage variety relevant to the described total resistance value on the path to described electrode front end and described total inductance value to the magnitude of voltage correction of the described output voltage detected by described testing agency, calculate described front voltage, described welding supply unit also possesses: data maintaining body, it remains on the described resistance value of each use kind of the power cable that the main circuit between described supply unit and described electrode uses and the proper range of the measured value of at least one of inductance value, or the intrinsic information of proper range can be set, with exceptional value decision mechanism, it is according to the judgement of described measured value whether in proper range, and the exceptional value of carrying out described measured value judges.
In the invention, measuring the total resistance value to electrode front end relevant to the calculating of electrode front voltage and adding up in the mode determination of inductance value, remained on the resistance value of each use kind of the power cable that supply unit-interelectrode main circuit uses and the proper range of the measured value of at least one of inductance value by data maintaining body or the intrinsic information of proper range can be set.In exceptional value decision mechanism, judge measured value whether in proper range, namely carry out exceptional value judgement.Thus, can easily judge whether to measure accurately the measured value of resistance value to be determined and inductance value.In addition, namely enablely to measure accurately measured value, the well-formedness (cable itself, any intermediate position etc.) about the original power cable used also can easily judge.
Invention described in technical scheme 2 is in the welding supply unit described in technical scheme 1, possesses exception reporting mechanism, and it reports this situation when being judged as that described measured value is exceptional value by described exceptional value decision mechanism.
In the invention, when judging that measured value is exceptional value by exceptional value decision mechanism, carry out abnormal report by exception reporting mechanism.Thus, easily can identify that measured value is abnormal by operator, promptly can carry out follow-up reply.
Invention described in technical scheme 3 is in the welding supply unit described in technical scheme 1 or 2, the described total resistance value obtained in described mode determination and total inductance value are the values that renewal limit, limit keeps, when to have carried out described measured value by described exceptional value decision mechanism be the judgement of exceptional value, described control device is forbidden kept described total resistance value and is added up to the renewal of inductance value.
In the invention, exceptional value decision mechanism, when having carried out measured value and being the judgement of exceptional value, is forbidden the total resistance value kept that renewal will use in the calculating of electrode front voltage and adds up to inductance value.Thus, can prevent useless Data Update, even if so be such as judged as the normal data of previous maintenance, this is exceptional value, also can leave previous normal data.
Invention described in technical scheme 4 possesses the welding supply unit described in any one of technical scheme 1 ~ 3 and the bonding machine formed.
In the invention, the quality of the resistance value that a kind of calculating easily carrying out electrode front voltage can be provided to use and the measured value of inductance value judges and the bonding machine of the well-formedness judgement of power cable that main circuit uses etc.
Invention effect
According to the present invention, the quality of the resistance value that a kind of calculating easily carrying out electrode front voltage can be provided to use and the measured value of inductance value judge and the well-formedness judgement of power cable that main circuit uses etc. welding supply unit and possess the bonding machine of this welding supply unit.
Accompanying drawing explanation
Fig. 1 is the pie graph of the supply unit of the arc welding machine representing present embodiment.
Fig. 2 is the key diagram for being described the change of inductance value.
Fig. 3 is the key diagram for being described the computational methods of resistance value and inductance value.
The sequential chart that Fig. 4 uses when being and being described the judgement of short-circuit condition.
Symbol description:
10 arc welding machines (bonding machine)
11 welding supply units
12 wire-electrode (electrode)
14 power cables
22 inverter circuits
23 welding transformers
24 rectification circuits (DC converting mechanism)
25 direct current reactors (DC converting mechanism)
31 control device (controlling organization, front voltage calculate mechanism, resistance value calculates mechanism, inductance value calculation mechanism, exceptional value decision mechanism, exception reporting mechanism)
33 current sensors (testing agency)
34 voltage sensors (testing agency)
35 storage devices (data maintaining body)
36 exception reporting devices (exception reporting mechanism)
M welding object
I output current
Ip1 current value
Ip2 current value
V output voltage
Va front voltage (front voltage value)
R adds up to resistance value
L adds up to inductance value
L (I) function
Detailed description of the invention
Below, with reference to the accompanying drawings the embodiment after the present invention being specialized is described.Fig. 1 represents the arc welding machine 10 of consumable electrode type.In arc welding machine 10, the wire-electrode 12 supported by welding torch TH is connected at the welding positive side lead-out terminal of supply unit 11, at the minus side lead-out terminal connecting welding object M of this supply unit 11, by the DC output power that generated by this supply unit 11 to the power supply of wire-electrode 12, carry out arc welding.Now, because wire-electrode 12 is consumed when welding, give so welding wire generator 13 corresponds to consumption.To wire-electrode 12 and welding object M, via the power cable 14 be connected with the lead-out terminal of supply unit 11 to supply output power.
Welding supply unit 11 is the devices AC input power of the three-phase provided from source power supply being transformed to the DC output power being suitable for arc welding.AC input power is transformed to direct current by the rectifier smoothing circuit 21 be made up of diode bridge and smmothing capacitor, and the direct current after conversion is transformed to high-frequency alternating current by inverter circuit 22.Inverter circuit 22 is made up of the bridgt circuit employing the switch element TR such as 4 IGBT, and the PWM implemented based on control device 31 controls.
The high-frequency alternating current generated by inverter circuit 22 is transformed to the secondary side alternating current being adjusted to assigned voltage value by welding transformer 23.The secondary side alternating current of welding transformer 23, by employing rectification circuit 24 and the direct current reactor 25 of diode, is transformed to the DC output power being suitable for arc welding.
The direct current reactor 25 of present embodiment uses the supersaturation reactor with supersaturation characteristic.As shown in Figure 2, the high current zone comprising the ratio rated current value Ia of current value Ip1 large is fixing usual characteristic area A1 with the MIN inductance value La of necessity to the characteristic of direct current reactor 25.On the other hand, the low current region becoming below rated current value Ia is the supersaturation characteristic area A2 (current value Ip2, inductance value Lb) along with the minimizing inductance value of current value increases linearly gradually.Namely, by adopting the direct current reactor 25 of such characteristic, thus it is little in high current zone inductance value, so little on the impact for the level and smooth Waveform Control of electric current, in low current region by increasing inductance value thus preventing arc cutting, generate at all suitable DC output power of whole galvanic areas.
As shown in Figure 1, the switch element TR of control device 31 pairs of inverter circuits 22 implements PWM and controls, and carries out the control making DC output power often for appropriate value.Now, control device 31 carries out the detection of output current I constantly and output voltage V, carries out the feedback controlled to PWM based on the output current I detected and output voltage V.
That is, the power line of the minus side lead-out terminal in supply unit 11 possesses current sensor 33, and control device 31 detects the output current I of supply unit 11 in handling part (CPU) 32 via this current sensor 33.In addition, possess voltage sensor 34 between the power line after adjacent rectification circuit 24, control device 31 detects the output voltage V of supply unit 11 in handling part 32 via this voltage sensor 34.Control device 31, based on the output current I detected constantly by handling part 32 and output voltage V, carries out the calculating of the dutycycle (duty) of PWM control, generates the pwm control signal exported to inverter circuit 22.
At this, in PWM controls, as the output voltage V for controlling, preferred employing correctly produces the front voltage Va of the wire-electrode 12 of electric arc, but the direct detection of front voltage Va is difficult.For this reason, voltage variety from voltage sensor 34 to electrode 12 remains in storage device (diagram slightly) by control device 31 in advance, the output voltage V detected constantly is carried out to the correction of this voltage variety, to obtain front voltage Va, and the PWM implementing have employed calculated front voltage Va controls.
But, in voltage variety from voltage sensor 34 to electrode 12, there is the voltage variety (from the voltage variety by resistance value R1 and inductance value L1 caused by of rectification circuit 24 to lead-out terminal) of supply unit 11 inside and the voltage variety (from lead-out terminal via the voltage variety that by resistance value R2 and inductance value L2 caused of power cable 14 to electrode 12 front end) of outside.In order to the impact not by using state, the builtin voltage variable quantity of supply unit 11 can be enrolled in advance the calculating of front voltage Va as correction term, but external voltage variable quantity is because the cable of power cable 14 is long or any intermediate position (straight-run or winding lay, its winding number) etc., condition are different because of each user, so be largely subject to the impact of the change of resistance value R2, particularly inductance value L2.
For this reason, user arranges arc welding machine 10 at the scene, also comprise when becoming proper use of state in being laid in of power cable 14, measure the resistance value R and inductance value L that obtain after being added up to by the resistance value R2 of the resistance value R1 of inside and inductance value L1 and outside and inductance value L2.The total resistance value R that mensuration obtains and total inductance value L is maintained in control device 31.
In addition, in the supply unit 11 of present embodiment, there is mode determination, this mode determination performs the process of the mensuration for carrying out above-mentioned total resistance value R and total inductance value L, according to the operation of the console switch be equipped with in supply unit 11 (diagram slightly), control device 31 can move to mode determination.In addition, also can be configured to: the remote controller (all not shown) be equipped with in the welding torch switch be equipped with in use welding torch TH, welding wire generator 13, moves to mode determination from the position leaving supply unit 11.In addition, when the mensuration of mode determination, wire-electrode 12 is needed to be set to the state with welding object M short circuit, but in the present embodiment as shown in Figure 1, not by wire-electrode 12 and welding object M direct short-circuit, but make to be provided in the leading section of welding torch TH and carry out to wire-electrode 12 the contact chip THa that powers and welding object M short circuit measures.In this case, the special fixtures that also can make short circuit uses.
If be described in detail mode determination, as shown in Figure 3, first, inverter circuit 22 is worked, and output current I increases to current value Ip1.This current value Ip1 is in the monomer of direct current reactor 25 with supersaturation characteristic, the current value of the usual characteristic area A1 fixed with inductance value La.In fact, as shown in Figure 2, because characteristic offsets because of any intermediate position etc. of power cable 14, so add up to inductance value L to fix with the value La1 of skew, the current value of the usual characteristic area A1 considering this side-play amount is set to.Further, measure with the average voltage level Ve in the interval of such current value Ip1 maintenance.Thus, first total resistance value R is calculated by formula (a) below.
R＝Ve/Ip1···(a)
Then, the action of inverter circuit 22 is stopped, timing from moment T0 now.Simultaneously, carry out the sampling of the output current I changed for the starting point moment with moment T0, the moment reached as the current value Δ Ip1 (Ip1 × 36.8%) of the current attenuation amount corresponding to time constant is set to T1, tries to achieve time (time constant) τ 1 between this moment T1-T0.Thus, the total inductance value La1 (being inductance value La in the monomer of reactor 25) changed at usual characteristic area A1 is calculated by following formula (b).
La1＝R·τ1(＝Ve·τ1/Ip1)···(b)
Then, again make inverter circuit 22 action, output current I is adjusted to the rated current value Ip2 in supersaturation characteristic area A2.After the adjustment, the action of inverter circuit 22 is again made to stop, timing from moment T2 now.Simultaneously, carry out the sampling of the output current I changed for the starting point moment with moment T2, the moment reached as the current value Δ Ip2 (Ip2 × 36.8%) of the current attenuation amount corresponding to time constant is set to T3, tries to achieve time (time constant) τ 2 between this moment T3-T2.Thus, the total inductance value Lb1 (being inductance value Lb in the monomer of reactor 25) changed at supersaturation characteristic area A2 is calculated by following formula (c).
Lb1＝R·τ2＝(Ve·τ2/Ip2)···(c)
Then, as shown in Figure 2, the total inductance value La1 of the usual characteristic area A1 calculated and the total inductance value Lb1 of supersaturation characteristic area A2 is augmented by straight line, obtains the function L (I) adding up to inductance value L as electric current I.Then, the function L (I) of the total inductance value L obtained like this and the total resistance value R that previously obtained is remained in control device 31.Thus, mode determination terminates.
Then, control device 31, when welding action, calculates front voltage Va according to output current I constantly and output voltage V by following formula (d).
Va＝V-L(I)·dI/dt-RI···(d)
In addition, if with concrete numeric representation, the current value Ip1=400 [A] of output current I is exported 10 [ms] clock according to the connection of inverter circuit 22, afterwards, inverter circuit 22 is disconnected.When average voltage level Ve is during this period 4 [V], according to above-mentioned formula (a), calculate and add up to resistance value R, R=Ve/Ip1=4/400=0.01 [Ω].
Then, the current value Δ Ip1 that current value Ip1 becomes the current attenuation amount suitable with timeconstantτ 1 is Δ Ip1=400 × 0.368=147 [A], if the timeconstantτ 1 that after making inverter circuit 22 disconnection, output current I reaches 147 [A] from 400 [A] is 3 [ms], then according to above-mentioned formula (b)
La1＝R·τ1＝0.01×3＝0.03[mH]
In usual characteristic area A1, calculate the total inductance value La1 of the inductance value La of the monomer comprising direct current reactor 25.In addition, above-mentioned current value Ip1 needs to infer according to the specification of the direct current reactor 25 used in advance, and is set as the value not reaching supersaturation characteristic area A2.
Then, again make inverter circuit 22 connect, output current I is set to such as suitable with the minimum current of the arc welding machine 10 current value Ip2=20 [A] in supersaturation characteristic area A2, export 10 [ms] clock, afterwards, inverter circuit 22 is made to turn off.The current value Δ Ip2 that current value Ip2 becomes the current attenuation amount suitable with timeconstantτ 2 is
ΔIp2＝20×0.368＝7[A]
If the timeconstantτ 2 that after disconnecting inverter circuit 22, output current I reaches 7 [A] from 20 [A] is 10 [ms], then according to above-mentioned formula (c),
Lb1＝R·τ2＝0.01×10＝0.1[mH]
In supersaturation characteristic area A2, calculate the total inductance value Lb1 of the inductance value Lb of the monomer comprising direct current reactor 25.
Then, by carrying out the straight line supplement of these La1=0.03 [mH], Lb1=0.1 [mH], thus obtain the function L (I) adding up to inductance value L, and according to this function and the total resistance value R previously to have obtained, front voltage Va constantly can be calculated according to above-mentioned formula (d).In addition, the above-mentioned concrete numerical value enumerated is an example, is not defined in this.
Even if having in the welding supply unit 11 of the present embodiment of the direct current reactor 25 of supersaturation characteristic and also can suitably calculate front voltage Va adopting like this, the control constantly of inverter circuit 22 can be carried out thus more rightly based on the front voltage Va suitably calculated.Therefore, by with the complementary effect of reactor 25 adopting supersaturation characteristic, the DC output power of whole galvanic areas all more suitably arc welding can be created on.
But, before the above-mentioned practical measurement of mode determination, carry out the judgement (judging before measuring) whether electrode 12 (contact chip THa) becomes sufficient short-circuit condition.Specifically, as shown in Figure 4, before the practical measurement of carrying out implementing to make output current I increase to current value Ip1, electrode 12 (contact chip THa) is applied to the voltage of such as 15 [V] left and right.In addition, below the output voltage V of above-mentioned use is divided into actual outlet side and detection side, the output voltage of actual outlet side is set to " Vs ", the output voltage of detection side is set to " Vm ".
According to the applying of the output voltage Vs of 15 [V] when judging before mensuration, under the short-circuit condition of electrode 12 (contact chip THa) is normal situation, the output voltage Vm detected by the handling part 32 of control device 31 is the small magnitude of voltage near 0 [V].Therefore, the output voltage Vm detected is lower than for the abnormal threshold value judged of short circuit, and handling part 32 is judged as being in can the short-circuit condition of practical measurement.On the other hand, when creating short circuit exception, the magnitude of voltage of the output voltage Vm detected uprises.If higher than the threshold value for the abnormal judgement of short circuit, then handling part 32 is judged as YES the short circuit abnormality suitably can not carrying out ensuing practical measurement.So handling part 32 makes exception reporting device 36 work to operator and reports exception.
In addition, by employing, the display be equipped with at supply unit 11 or welding torch TH, welding wire generator 13 etc. carries out reporting exception reporting device 36, the device etc. of report of being undertaken pronouncing by the work sound etc. of buzzer or relay is formed.In addition, when discharging inert gas while when carrying out weld arc welding machine 10 from the leading section of welding torch TH, also previous exception reporting can be carried out by the unlocking noise of gas.Then, operator receives this exception reporting, carries out the reliable short circuit of electrode 12 (contact chip THa), implements to measure once again according to judging before mensuration.
Then, because when it is also conceivable to implement practical measurement, the short-circuit condition of electrode 12 (contact chip THa) occurs abnormal, so the handling part 32 of control device 31 carries out the detection of the abnormal voltage of detected output voltage Vm.Produce if detect by the abnormal abnormal voltage caused of short circuit, then handling part 32 makes exception reporting device 36 work to operator as described above and reports exception.Operator similarly receives this exception reporting, carries out the reliable short circuit of electrode 12 (contact chip THa), implements to measure once again according to judging before mensuration.
And then even if the short circuit that it is also conceivable to owing to not producing electrode 12 (contact chip THa) measures normal termination extremely, acquired total resistance value R also may become exceptional value with adding up to inductance value L.Such as, the power cable 14 laid between supply unit 11 and welding torch TH inappropriate cable such as adopt sectional area, cable long, even or suitable product but the situation of reeling condition exception is inferior, measured value can become exceptional value.Given this, in the storage device 35 be equipped with in the control device 31 of present embodiment, will the sectional area of the cable 14 of this supply unit 11 be suitable for and cable is long etc., be associated with the proper range of its resistance value zero [Ω] and inductance value Δ [μ H] and carry out database (DB) and change to keep.
Then, whether handling part 32, according to the resistance value of cable 14 of current use and the proper range of inductance value, judges the total resistance value R of practical measurement and adds up to inductance value L in this proper range.Carry out the renewal adding up to resistance value R and add up to inductance value L when in proper range, namely carry out the total resistance value R of current maintenance as control device 31 and add up to the Data Update of inductance value L, for later control.On the other hand, at the total resistance value R being judged as measuring with add up to inductance value L when proper range outer (exceptional value), do not carry out the total resistance value R of current maintenance as control device 31 and add up to the Data Update of inductance value L, implementing exception reporting by exception reporting device 36.Operator receives this exception reporting, can carry out the confirmation of mensuration state, carries out the confirmation of power cable 14 itself and the confirmation etc. of its any intermediate position of current use.
Next, the distinctive effect of notebook embodiment.
(1) measuring the total resistance value R to the front end of electrode 12 relevant to the calculating of front voltage Va with under the mode determination adding up to inductance value L (being function L (I) in the present embodiment), the resistance value of each use kind of the power cable 14 that the main circuit between supply unit 11 and electrode 12 uses, the proper range of inductance value by data base system after remain in storage device 35.Handling part 32, according to the resistance value of cable 14, the proper range of inductance value of current use, judges the resistance value R that practical measurement obtains and inductance value L whether in this proper range (exceptional value judgement).Wherein, when in proper range, carry out the resistance value R of current maintenance and the Data Update of inductance value L by control device 31.Thus, can easily judge whether to carry out high-precision mensuration to the measured value of resistance value R to be determined and inductance value L.In addition, namely enablely accurately measured value to be measured, also easily can judge the well-formedness (cable itself, any intermediate position etc.) of the original power cable 14 used.Therefore, judge even if do not rely on skilled operators also easily can carry out these, so be expected to improve operating efficiency.
(2) when the measured value being judged as resistance value R and inductance value L is exceptional value, exception reporting device works, and carries out abnormal report.Thus, easily can identify that measured value is abnormal by operator, promptly can carry out follow-up reply.
(3) when the measured value of having carried out resistance value R and inductance value L is the judgement of exceptional value, the resistance value R of maintenance that will use in the calculating of front voltage Va and the renewal of inductance value L is forbidden.Thus, can prevent useless Data Update, even if so be such as judged as the normal data of previous maintenance, this is exceptional value, also can leave previous normal data.
In addition, embodiments of the present invention also can change as following.
In the above-described embodiment, when the measured value being judged as resistance value R and inductance value L is exceptional value, forbid the resistance value R relevant to the calculating of front voltage Va and the Data Update of inductance value L, but the judged result that also can judge regardless of exceptional value how, all carry out Data Update when each mensuration.In addition, also can select by operator the judgement whether carrying out Data Update.
The hold mode of data described in the above-described embodiment and the judgment mode of exceptional value are an example, so can carry out suitable change.
Such as about the hold mode of data, be that each resistance value of use kind of power cable 14, the data of the proper range of inductance value are kept, but such as also can keep any one party data in resistance value, inductance value in above-mentioned embodiment.In addition, also can not keep the data of the various resistance value of cable 14, the proper range of inductance value, but keep the data of an eigenvalue respectively, set its proper range in handling part 32 side.In addition, about the judgement of exceptional value, be judge according to each resistance value of cable 14, comparing between the proper range of inductance value with practical measurement value, but also can relatively judging only according to any one party.
The exception reporting device 36 only example described in the above-described embodiment, so can suitably change.
In the above-described embodiment, although before the assay or actual measurement fixed in carry out the judgement of the short circuit exception of electrode 12, also this can be omitted.
Employ the direct current reactor 25 with supersaturation characteristic in the above-described embodiment, but also can use there is the general reactor that current value and inductance value fix the linear characteristic of change.In addition, if use such reactor, then just can obtain inductance value (not needing to obtain function) by the mensuration of primary current attenuation, thus the calculating of front voltage Va becomes easy.
Claims (4)
1. a welding supply unit, it possesses DC power conversion is the inverter circuit of high-frequency alternating current, the welding transformer of the Voltage Cortrol of the alternating current after converting, the DC converting mechanism being suitable for the DC output power welded is generated with the secondary side alternating current according to this welding transformer, it also possesses control device, this control device is based on the supply of generated described output power to electrode, the device of the electric arc generation of welding is used between welding object, and the front voltage of described electrode is calculated based on the output current detected with the testing agency in supply unit by this welding and output voltage, described inverter circuit is controlled based on the front voltage calculated,
Wherein, described control device has the mode determination performing the process comprising resistance value calculating mechanism and inductance value calculation mechanism, and possess front voltage and calculate mechanism, described resistance value calculates mechanism and described electrode is set to short-circuit condition and processes, the magnitude of voltage of described output voltage when being set to rated current value based on the described output current action by described inverter circuit produced, calculate the total resistance value on the path till described electrode front end, described electrode is set to short-circuit condition and processes by described inductance value calculation mechanism, current attenuation amount when being set as rated current value based on the described output current action by described inverter circuit produced, calculate the total inductance value on the path till described electrode front end, described front voltage calculates mechanism's voltage variety relevant to the described total resistance value on the path to described electrode front end and described total inductance value to the magnitude of voltage correction of the described output voltage detected by described testing agency, calculate described front voltage,
Described welding supply unit also possesses:
Data maintaining body, its intrinsic information remaining on the described resistance value of each use kind of the power cable that the main circuit between described supply unit and described electrode uses and the proper range of the measured value of at least one of inductance value or proper range can be set; With
Exceptional value decision mechanism, it is according to the judgement of described measured value whether in proper range, and the exceptional value of carrying out described measured value judges.
2. welding supply unit according to claim 1, is characterized in that,
Possess exception reporting mechanism, it reports this situation when being judged as that described measured value is exceptional value by described exceptional value decision mechanism.
3. welding supply unit according to claim 1 and 2, is characterized in that,
The described total resistance value obtained in described mode determination and total inductance value are the values that renewal limit, limit keeps,
When to have carried out described measured value by described exceptional value decision mechanism be the judgement of exceptional value, described control device is forbidden kept described total resistance value and is added up to the renewal of inductance value.
4. a bonding machine, is characterized in that, possesses the welding supply unit described in any one of claims 1 to 3 and forms.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011015509A JP5756297B2 (en) | 2011-01-27 | 2011-01-27 | Welding power supply and welding machine |
| JP2011-015509 | 2011-07-06 |
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| Publication Number | Publication Date |
|---|---|
| CN102615386A CN102615386A (en) | 2012-08-01 |
| CN102615386B true CN102615386B (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210020045.6A Active CN102615386B (en) | 2011-01-27 | 2012-01-21 | Power supply device for welding and welding machine |
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|---|---|---|---|---|
| JP5868712B2 (en) * | 2012-01-20 | 2016-02-24 | 株式会社ダイヘン | Power supply for welding |
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Also Published As
| Publication number | Publication date |
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| JP5756297B2 (en) | 2015-07-29 |
| CN102615386A (en) | 2012-08-01 |
| JP2012152805A (en) | 2012-08-16 |
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