JPH0411302B2 - - Google Patents
Info
- Publication number
- JPH0411302B2 JPH0411302B2 JP61032964A JP3296486A JPH0411302B2 JP H0411302 B2 JPH0411302 B2 JP H0411302B2 JP 61032964 A JP61032964 A JP 61032964A JP 3296486 A JP3296486 A JP 3296486A JP H0411302 B2 JPH0411302 B2 JP H0411302B2
- Authority
- JP
- Japan
- Prior art keywords
- output current
- output
- power source
- welding power
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000003466 welding Methods 0.000 claims description 28
- 238000004804 winding Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Arc Welding Control (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は定電流制御されるパルスアーク溶接電
源の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in a constant current controlled pulse arc welding power source.
トランジスタを用いたインバータ回路を出力制
御要素とするパルスアーク溶接電源の従来例を第
２図に示す。
FIG. 2 shows a conventional example of a pulsed arc welding power source that uses an inverter circuit using transistors as an output control element.
溶接電源主回路は、商用交流電源からの交流入
力を整流、平滑して直流電圧とする直流電源１、
この直流電圧を高周波交流に変換するインバータ
回路２、溶接トランス３、出力側整流器４および
出力電流平滑用直流リアクタ５で構成され、出力
電流設定器６から出力されるパルス波形の出力電
流設定信号と電流検出器７からの出力電流値検出
信号との差を増幅する比較増幅器８の出力信号に
応じてインバータ駆動回路９でインバータ回路２
の導通幅を変化させることにより、溶接電源の出
力電流をフイードバツク制御し、第３図の実線で
示すようにピーク電流IPとベース電流IBに交互に
変化するパルス波形の出力電流をアーク負荷１０
に供給する。１１は母材、１２は溶接ワイヤ、１
３はワイヤ送給ローラ、１４はその駆動モータで
ある。 The welding power source main circuit includes a DC power source 1 that rectifies and smoothes AC input from a commercial AC power source to generate a DC voltage;
It consists of an inverter circuit 2 that converts this DC voltage into high-frequency AC, a welding transformer 3, an output rectifier 4, and an output current smoothing DC reactor 5. The inverter drive circuit 9 inverts the inverter circuit 2 according to the output signal of the comparator amplifier 8 that amplifies the difference between the output current value detection signal from the current detector 7 and the output current value detection signal from the current detector 7.
The output current of the welding power source is feedback controlled by changing the conduction width of 10
supply to. 11 is the base material, 12 is the welding wire, 1
3 is a wire feeding roller, and 14 is its drive motor.
このような従来のパルスアーク溶接電源におい
ては、出力電流値がピーク電流とベース電流に高
速度で切換えられるため、フイードバツクのゲイ
ンを高くした場合、制御系の応答遅れにより、出
力電流が設定値に対してオーバシユートし、ベー
ス電流IBを低く設定すると、オーバシユートによ
つてアーク切れが生じたり、アークが不安定とな
ることがあり、かと言つてゲインを下げたもので
は出力電流の定電流性が損なわれる。 In such conventional pulsed arc welding power sources, the output current value is switched between the peak current and the base current at high speed, so when the feedback gain is set high, the output current may not reach the set value due to the response delay of the control system. On the other hand, if you overshoot and set the base current I B low, the arc may break or become unstable due to the overshoot. be damaged.
また、この従来例では、出力電流波形の立上が
り、立下がりの傾斜については制御されないた
め、電源電圧や溶接ケーブルの長さにより、第３
図の点線で示す設定波形に対して実際の出力電流
波形が実線あるいは鎖線図示のように変化し、安
定した溶接特性が得られなかつた。 In addition, in this conventional example, since the slope of the rise and fall of the output current waveform is not controlled, the third
The actual output current waveform varied as shown by the solid line or chain line with respect to the set waveform shown by the dotted line in the figure, and stable welding characteristics could not be obtained.
本発明は、上記のような出力電流がアーバシユ
ートしたり、出力電流波形の立上がり、立下がり
の傾斜が変化すると言つた従来装置の問題点を解
決し、常に適正な波形に出力電流を制御できるパ
ルスアーク溶接電源を提供することを目的とす
る。
The present invention solves the problems of conventional devices such as the above-mentioned output current arthrobbing and changes in the rising and falling slopes of the output current waveform, and provides a pulse pulse that can always control the output current to an appropriate waveform. The purpose is to provide arc welding power sources.
本発明は、溶接電源の出力電流値を検出する電
流検出器と、パルス波形の出力電流設定信号を発
生する出力電流設定器と、上記出力電流設定信号
と上記電流検出器からの出力電流値検出信号との
差を増幅する第１段比較増幅器と、上記第１段比
較増幅器の出力信号と溶接電源の出力側回路に直
列に接続された直流リアクタの二次巻線の誘起電
圧との差を増幅する第２段比較増幅器とを備え、
上記第２段比較増幅器の出力信号を溶接電源の出
力制御要素に対する制御信号として溶接電源出力
電流を制御するようにしたものである。このよう
に構成された本発明のパルスアーク溶接電源にお
いては、出力電流の変化率（di／dt）に対応した
直流リアクタの二次巻線の誘起電圧が第２段比較
増幅器にフイードバツクされるため、第１段比較
増幅器の出力、すなわち出力電流設定信号と出力
電流値検出信号との差に応じて、出力電流値が設
定値に近付くように出力電流波形の立上がり、立
下がりの傾斜（di／dt）が制御されることにな
り、その結果、出力電流値が設定値近くになると
di／dtが抑制されるので、出力電流はオーバシユ
ートしなくなる。また、出力電流波形の立上が
り、立下がりの傾斜は第２段比較増幅器のゲイン
によつて決まり、電源電圧の溶接ケーブルの長さ
によつて左右されなくなる。
The present invention provides a current detector that detects the output current value of a welding power source, an output current setter that generates an output current setting signal of a pulse waveform, and a detection of the output current value from the output current setting signal and the current detector. A first-stage comparison amplifier amplifies the difference between the signal and the difference between the output signal of the first-stage comparison amplifier and the induced voltage in the secondary winding of a DC reactor connected in series to the output side circuit of the welding power source. and a second stage comparison amplifier for amplification.
The output signal of the second stage comparison amplifier is used as a control signal for the output control element of the welding power source to control the output current of the welding power source. In the pulsed arc welding power source of the present invention configured as described above, the induced voltage in the secondary winding of the DC reactor corresponding to the rate of change (di/dt) of the output current is fed back to the second stage comparison amplifier. , the slope of the rise and fall of the output current waveform (di/ dt) is controlled, and as a result, when the output current value becomes close to the set value,
Since di/dt is suppressed, the output current will not overshoot. Further, the slope of the rise and fall of the output current waveform is determined by the gain of the second stage comparator amplifier and is not influenced by the length of the welding cable of the power supply voltage.
第１図に本発明の一実施例を示す。第１図中、
商用交流電源からの交流入力を整流、平滑した直
流電源１の電圧を出力制御要素として設けたイン
バータ回路２で高周波交流に変換して溶接トラン
ス３の一次側に印加し、溶接トランス３の二次出
力を二次側整流器４で整流し、直流リアクタ５を
介してアーク負荷１０に供給する溶接電源主回路
の構成は第２図と同一であるが、直流リアクタ５
に二次巻線５ａを設けた点が第２図と相違する。
出力電流設定器６は第４図の点線で示す設定波形
に相当する出力電流設定信号を発生するパルス発
生器であり、本実施例では、この出力電流設定信
号と電流検出器７からの出力電流値検出信号との
差を第１段比較増幅器８で増幅し、さらにこの第
１段比較増幅器８の出力信号と直流リアクタ５に
設けた二次巻線５ａの誘起電圧との差を第２段比
較増幅器１５で増幅し、この第２段比較増幅器１
５の出力信号をインバータ駆動回路９に制御信号
として加え、制御信号に応じてインバータ回路２
の導通幅を変化させることにより、溶接電源の出
力電流を、その電流波形が出力電流設定信号に従
つてピーク電流IPとベース電流IBに交互に変化す
るパルス波形となるように制御するものである。
FIG. 1 shows an embodiment of the present invention. In Figure 1,
The voltage of the DC power supply 1 is rectified and smoothed from the AC input from a commercial AC power supply, and is converted into high-frequency AC by the inverter circuit 2 provided as an output control element, and applied to the primary side of the welding transformer 3, and then applied to the secondary side of the welding transformer 3. The configuration of the welding power source main circuit that rectifies the output with the secondary rectifier 4 and supplies it to the arc load 10 via the DC reactor 5 is the same as that shown in FIG.
It differs from FIG. 2 in that a secondary winding 5a is provided at .
The output current setting device 6 is a pulse generator that generates an output current setting signal corresponding to the setting waveform shown by the dotted line in FIG. The difference with the value detection signal is amplified by the first stage comparison amplifier 8, and the difference between the output signal of the first stage comparison amplifier 8 and the induced voltage of the secondary winding 5a provided in the DC reactor 5 is amplified by the second stage. The comparison amplifier 15 amplifies the second stage comparison amplifier 1.
5 is applied as a control signal to the inverter drive circuit 9, and the inverter circuit 2 is controlled according to the control signal.
Controls the output current of the welding power source by changing the conduction width of the welding power source so that the current waveform becomes a pulse waveform that alternately changes to peak current I P and base current I B according to the output current setting signal. It is.
このような構成することにより、溶接電源出力
電流がIBからIP、IPからIBへ変化する際、前述し
たように第１段比較増幅器８の出力、すなわち出
力電流設定信号と出力電流値検出信号との差に応
じて、出力電流波形の傾斜（di／dt）が制御され
るため、第４図の実線で示す出力電流波形のう
ち、出力電流設定信号と出力電流値検出信号との
差が比較的大きく、第１段比較増幅器８の出力が
正の飽和状態にあるａ−ｂ、ｄ−ｅ区間には、
di／dtは第２段比較増幅器１５のゲインにより定
まる一定値となるが、その後のｂ−ｅ、ｅ−ｆ区
間には、出力電流設定信号と出力電流値検出信号
との差が零に近付くにつれて、di／dtが小さくな
る方向、すなわち出力電流波形の傾斜が緩くなる
方向に変化し、オーバシユートのない出力電流波
形が得られる。 With this configuration, when the welding power source output current changes from I B to I P and from I P to I B , the output of the first stage comparison amplifier 8, that is, the output current setting signal and the output current The slope (di/dt) of the output current waveform is controlled according to the difference between the output current setting signal and the output current value detection signal. In the sections a-b and de, where the difference between
di/dt is a constant value determined by the gain of the second-stage comparison amplifier 15, but in the subsequent b-e and e-f sections, the difference between the output current setting signal and the output current value detection signal approaches zero. As the di/dt decreases, the slope of the output current waveform becomes gentler, and an output current waveform without overshoot is obtained.
この構成によると、直流リアクタ５の二次巻線
の誘起電圧の第２段比較増幅器１５にフイードバ
ツクさせたことにより、出力電流波形の立上が
り、立下がり時のように出力電流が変化している
ときには、制御系全体としてのゲインは等価的に
低く抑えられるが、出力電流が安定した状態で
は、直流リアクタ５の二次巻線電圧がほぼ零とな
ることにより、制御系全体としてのゲインが高く
なるので、出力電流の定電流性を損なうことがな
い。 According to this configuration, the voltage induced in the secondary winding of the DC reactor 5 is fed back to the second stage comparator amplifier 15, so that when the output current changes, such as when the output current waveform rises or falls, , the gain of the control system as a whole is equivalently kept low, but when the output current is stable, the secondary winding voltage of the DC reactor 5 becomes almost zero, so the gain of the control system as a whole becomes high. Therefore, the constant current property of the output current is not impaired.
以上のように本発明によれば、定常状態での出
力電流の定電流性を損なわずに、出力電流の設定
値からのオーバシユートをなくすことができ、ベ
ース電流を低く設定した場合でも、アーク切れを
生じたり、アークが不安定になることを防止でき
る。
As described above, according to the present invention, it is possible to eliminate overshoot from the set value of the output current without impairing the constant current property of the output current in a steady state, and even when the base current is set low, arc breakage can occur. This prevents the arc from becoming unstable.
また、出力電流波形の立上がり、立下がりの傾
斜が電源電圧や溶接ケーブルの長さにより左右さ
れず、常に安定した溶接特性が得られる。 Furthermore, the slope of the rise and fall of the output current waveform is not affected by the power supply voltage or the length of the welding cable, and stable welding characteristics can always be obtained.
第１図は本発明の一実施例を示す回路図、第２
図は従来例の回路図、第３図は従来例の設定波形
に対する出力電流波形を示す図、第４図は本発明
の設定波形に対する出力電流波形を示す図であ
る。
２……出力電流制御要素であるインバータ回
路、５……直流リアクタ、５ａ……二次巻線、６
……出力電流設定器、７……電流検出器、８……
第１段比較増幅器、１５……第２段比較増幅器、
IP……ピーク電流、IB……ベース電流。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
This figure is a circuit diagram of a conventional example, FIG. 3 is a diagram showing an output current waveform with respect to a set waveform of the conventional example, and FIG. 4 is a diagram showing an output current waveform with respect to a set waveform of the present invention. 2... Inverter circuit which is an output current control element, 5... DC reactor, 5a... Secondary winding, 6
...Output current setting device, 7...Current detector, 8...
1st stage comparison amplifier, 15... 2nd stage comparison amplifier,
I P ... Peak current, I B ... Base current.
Claims (1)
変化させるインバータを用いるパルスアーク溶接
電源において、出力電流値を検出する電流検出器
と、パルス波形の出力電流設定信号を発生する出
力電流設定器と、上記出力電流設定信号と上記電
流検出器からの出力電流値検出信号との差を増幅
する第１段比較増幅器と、上記第１段比較増幅器
の出力信号と溶接電源の出力側回路に直列に接続
された直流リアクタの二次巻線の誘起電圧との差
を増幅する第２段比較増幅器とを備え、上記第２
段比較増幅器の出力信号を溶接電源の出力制御要
素に対する制御信号として溶接電源出力電流を制
御するようにしたことを特徴とするパルスアーク
溶接電源。1. In a pulsed arc welding power source that uses an inverter that alternately changes the output current to a peak current and a base current, a current detector that detects the output current value, an output current setting device that generates an output current setting signal with a pulse waveform, A first-stage comparison amplifier that amplifies the difference between the output current setting signal and the output current value detection signal from the current detector, and the output signal of the first-stage comparison amplifier is connected in series to the output side circuit of the welding power source. and a second stage comparator amplifier for amplifying the difference between the voltage induced in the secondary winding of the DC reactor and the voltage induced in the secondary winding of the DC reactor.
A pulsed arc welding power source characterized in that the output signal of the stage comparison amplifier is used as a control signal for an output control element of the welding power source to control the output current of the welding power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3296486A JPS62192264A (en) | 1986-02-19 | 1986-02-19 | Pulse arc welding power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3296486A JPS62192264A (en) | 1986-02-19 | 1986-02-19 | Pulse arc welding power source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62192264A JPS62192264A (en) | 1987-08-22 |
| JPH0411302B2 true JPH0411302B2 (en) | 1992-02-28 |
Family
ID=12373597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3296486A Granted JPS62192264A (en) | 1986-02-19 | 1986-02-19 | Pulse arc welding power source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62192264A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004034073A (en) * | 2002-07-02 | 2004-02-05 | Daihen Corp | Pulse arc welding control method |
| WO2006105631A1 (en) * | 2005-04-08 | 2006-10-12 | Svetlana Viktorovna Zinakova | Multipurpose mobile welding converter |
| JP6941410B2 (en) * | 2017-08-31 | 2021-09-29 | 株式会社ダイヘン | Pulse arc welding control method |
| JP6911253B2 (en) * | 2017-09-19 | 2021-07-28 | 株式会社ダイヘン | Welding power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5719164A (en) * | 1980-07-08 | 1982-02-01 | Mitsubishi Electric Corp | Pulse arc welding device |
| JPS5913572A (en) * | 1982-07-14 | 1984-01-24 | Sansha Electric Mfg Co Ltd | Pulsed arc welding machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6217162Y2 (en) * | 1981-04-06 | 1987-04-30 |
-
1986
- 1986-02-19 JP JP3296486A patent/JPS62192264A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5719164A (en) * | 1980-07-08 | 1982-02-01 | Mitsubishi Electric Corp | Pulse arc welding device |
| JPS5913572A (en) * | 1982-07-14 | 1984-01-24 | Sansha Electric Mfg Co Ltd | Pulsed arc welding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62192264A (en) | 1987-08-22 |
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