JPH0131991B2 - - Google Patents
Info
- Publication number
- JPH0131991B2 JPH0131991B2 JP1231483A JP1231483A JPH0131991B2 JP H0131991 B2 JPH0131991 B2 JP H0131991B2 JP 1231483 A JP1231483 A JP 1231483A JP 1231483 A JP1231483 A JP 1231483A JP H0131991 B2 JPH0131991 B2 JP H0131991B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- output
- welding output
- reference period
- cycle
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、CO2溶接、MAG溶接（マグ溶接）
のように消耗電極である溶接ワイヤを自動送給し
ながら溶接を行う溶接機に用いられるトランジス
タチヨツパ式の溶接用電源に関するものである。[Detailed description of the invention] Industrial application field This invention is applicable to CO 2 welding, MAG welding (MAG welding)
The present invention relates to a transistor chopper type welding power source used in a welding machine that performs welding while automatically feeding a welding wire, which is a consumable electrode.
従来例の構成とその問題点
トランジスタチヨツパ式溶接用電源のトランジ
スタオン時間とオフ時間とで構成される一周期時
間は、従来、スプレー移行アーク溶接のパルスマ
グ溶接ではワイヤ送給量の増加に伴い減少させ、
短絡移行、球滴移行アークのマグ、CO2溶接では
ワイヤ送給量にかかわらず一定値とするのが通常
であつた。この一周期時間は、パルスマグ溶接で
は円滑なスプレー移行アークを実現するため30ｍ
sec〜３ｍsecの値に、マグ、CO2溶接では出力リ
ツプルを低減し安定な短絡移行、球滴移行アーク
を実現するために0.5ｍsec前後の一定値に設定さ
れていた。第１図に従来のトランジスタチヨツパ
式溶接用電源のワイヤ送給量に対するトランジス
タのオンオフで構成される一周期時間の特性例を
示す。同図において、ａはパルスマグ溶接時の特
性であり、ｂはCO2、マグ溶接時の特性である。Conventional structure and its problems One cycle time, which consists of the transistor on time and off time of the transistor chopper type welding power source, was conventionally difficult to increase the wire feed rate in pulsed MAG welding of spray transfer arc welding. decrease accordingly,
In short-circuit transfer, droplet transfer arc MAG, and CO 2 welding, it was normal to keep the value constant regardless of the wire feed rate. This one cycle time is 30 m to achieve a smooth spray transition arc in pulsed mag welding.
sec to 3 msec, and in MAG and CO 2 welding, it was set to a constant value of around 0.5 msec in order to reduce output ripple and realize stable short-circuit transition and droplet transition arc. FIG. 1 shows an example of the characteristic of one cycle time, which is made up of turning on and off transistors, with respect to the amount of wire fed in a conventional transistor chopper type welding power source. In the figure, a is the characteristic during pulsed MAG welding, and b is the characteristic during CO 2 MAG welding.
第１図の従来例における問題点は、トランジス
タの損失による機器最大定格である。トランジス
タの熱損失Ｐは、トランジスタターンオン時の損
失の和をPtON、トランジスタターンオフ時の損失
の和PtOFF、トランジスタオン時の損失の和を
PON、トランジスタベース電流による損失の和を
Pbとすれば、これらの和となる。すなわち、
Ｐ＝PtON＋PtOFF＋PON＋Pb …(1)
となる。Pbの値は他に較べて小であり、PONの値
は出力平均値が同一であれば一周期時間によらず
ほぼ一定値となる。しかしながら、PtONとPtOFF
とは一周期時間が小であるほど大となる。しか
も、特にPtOFFの値は、全損失Ｐに対し相当大な
る比率を有する。したがつて、第１図のCO2、マ
グ溶接時の特性は、トランジスタの熱損失の面か
らは不利な特性といえる。これゆえに従来の両特
性を有する溶接用電源は、CO2、マグ溶接時の最
大定格出力値をパルスマグ溶接時の最大定格出力
値よりも小なる値に規定して対処してきた。 The problem with the conventional example shown in FIG. 1 is the maximum rating of the device due to transistor loss. The thermal loss P of a transistor is the sum of the losses when the transistor is turned on, Pt ON , the sum of the losses when the transistor is turned off, Pt OFF , and the sum of the losses when the transistor is turned on.
P ON , the sum of losses due to transistor base current is
If P b is the sum of these. That is, P=Pt ON +Pt OFF +P ON +P b (1). The value of P b is small compared to the others, and the value of P ON is a nearly constant value regardless of one cycle time if the average output value is the same. However, Pt ON and Pt OFF
The smaller the one cycle time, the larger the value becomes. Moreover, the value of Pt OFF in particular has a considerably large ratio to the total loss P. Therefore, the characteristics during CO 2 and MAG welding shown in FIG. 1 can be said to be disadvantageous in terms of heat loss of the transistor. For this reason, conventional welding power sources having both characteristics have been dealt with by setting the maximum rated output value during CO 2 and MAG welding to a value smaller than the maximum rated output value during pulsed MAG welding.
発明の目的
この発明は、CO2、マグ溶接時の機器最大定格
出力値をトランジスタの容量を大にすることなく
増加させることができる溶接用電源を提供するこ
とを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to provide a welding power source that can increase the maximum rated output value of equipment during CO 2 and MAG welding without increasing the capacity of the transistor.
発明の構成
この発明は、CO2、マグ溶接の溶接出力リツプ
ルが溶接性能にさほど影響しない高出力域（ワイ
ヤ送給量が大なる範囲）において前記一周期時間
を増加させて低周波数トランジスタスイツチング
とし、前記第(1)式のPtONとPtOFFとを減少させて
損失Ｐを減少させることを特徴とするものであ
る。Structure of the Invention The present invention provides low frequency transistor switching by increasing the one cycle time in a high output range (a range where the wire feed rate is large) where the welding output ripple of CO 2 and MAG welding does not significantly affect welding performance. The present invention is characterized in that the loss P is reduced by reducing Pt ON and Pt OFF in equation (1).
実施例の説明
第２図はこの発明の一実施例のトランジスタチ
ヨツパ式溶接用電源の回路図を示している。第２
図において、１は溶接用変圧器、２は整流器、３
は平滑用コンデンサ、４は溶接出力制御用トラン
ジスタ、５はリアクタ、６は溶接機出力端子、７
は溶接機入力端子、８はトランジスタ駆動回路、
９は分周カウンタ回路、１０は基準周波数信号発
生回路、１１はマイクロコンピユータをはじめと
する論理演算素子および記憶素子から構成される
演算・記憶回路、１２は溶接出力設定器、１３は
パルスマグ溶接とCO2、マグ溶接との出力特性を
切換える出力特性切換器、１４は抵抗、１５はサ
イリスタである。DESCRIPTION OF EMBODIMENTS FIG. 2 shows a circuit diagram of a transistor chopper type welding power source according to an embodiment of the present invention. Second
In the figure, 1 is a welding transformer, 2 is a rectifier, and 3 is a welding transformer.
is a smoothing capacitor, 4 is a transistor for controlling welding output, 5 is a reactor, 6 is a welding machine output terminal, 7
is the welding machine input terminal, 8 is the transistor drive circuit,
9 is a frequency division counter circuit, 10 is a reference frequency signal generation circuit, 11 is an arithmetic/memory circuit composed of logical operation elements including a microcomputer, and storage elements, 12 is a welding output setting device, and 13 is a pulsed MAG welding circuit. 14 is a resistor, and 15 is a thyristor.
このトランジスタチヨツパ式溶接用電源は、溶
接機入力端子７より三相交流電源が入力される
と、それが溶接用変圧器１で変圧されたのち整流
器２および平滑用コンデンサ３で整流および平滑
され、溶接出力制御用トランジスタ４およびリア
クタ５を介して溶接機出力端子６，６間に溶接電
流を流す。溶接出力制御用トランジスタ４はトラ
ンジスタ駆動回路８からの駆動信号により所定の
周期でオンオフする。 In this transistor chopper type welding power source, when three-phase AC power is input from the welding machine input terminal 7, it is transformed by a welding transformer 1, and then rectified and smoothed by a rectifier 2 and a smoothing capacitor 3. A welding current is caused to flow between the welding machine output terminals 6 and 6 via the welding output control transistor 4 and the reactor 5. The welding output control transistor 4 is turned on and off at a predetermined cycle by a drive signal from a transistor drive circuit 8.
また、出力設定器１２の設定値および出力特
性切換器１３とにより、演算・記憶回路１１で命
令デジタル信号ｎを分周カウンタ回路９に出力す
る。この場合、命令デジタル信号ｎは、演算・記
憶回路１１により出力設定器１２の設定値Ｉの増
加に応じて増加する。 Further, the command digital signal n is outputted to the frequency division counter circuit 9 by the arithmetic/memory circuit 11 based on the set value of the output setter 12 and the output characteristic switch 13 . In this case, the command digital signal n is increased by the arithmetic/storage circuit 11 in accordance with the increase in the set value I of the output setter 12.
分周カウンタ回路は、基準周波数信号発生回路
１０の基準クロツク信号を同時に入力し、周波数
Ｎの基準クロツク信号をｎ分周してトランジスタ
駆動回路８に出力する。この結果、溶接出力制御
用トランジスタ４はN/nなる周波数でスイツチン
グ動作を行なう。なお、第２図の実施例において
は、一周期時間内におけるトランジスのオン時間
およびオフ時間の制御に関する説明は省略してい
る。 The frequency division counter circuit simultaneously inputs the reference clock signal of the reference frequency signal generation circuit 10, divides the frequency of the reference clock signal of frequency N by n, and outputs the frequency-divided signal to the transistor drive circuit 8. As a result, the welding output control transistor 4 performs a switching operation at a frequency of N/n. In the embodiment shown in FIG. 2, the explanation regarding the control of the on time and off time of the transistor within one cycle time is omitted.
以上の構成によりトランジスタのオン時間とオ
フ時間とで構成された一周期時間を出力設定値の
増加（ワイヤ送給量の増加）とともに大なる値と
することができる。なお、従来例の項で述べたよ
うにCO2、マグ溶接で前記一周期時間を増加させ
ると溶接出力のリツプルが増加する。しかしなが
ら、溶接出力の大なる範囲ではこのリツプルは溶
接性能にほとんど影響を与えない。 With the above configuration, one cycle time made up of the on time and off time of the transistor can be increased as the output setting value increases (wire feeding amount increases). Note that, as described in the conventional example section, when the one cycle time is increased in CO 2 and MAG welding, the ripple in the welding output increases. However, over a large range of welding power, this ripple has little effect on welding performance.
具体的には、基準クロツク信号として8192Hzを
用いた。また、溶接出力設定値IAに対し、演
算・記憶回路１１から分周カウンタ回路９に出力
するデータｎは次式によつて算出した。 Specifically, 8192Hz was used as the reference clock signal. Further, data n to be outputted from the calculation/storage circuit 11 to the frequency division counter circuit 9 with respect to the welding output setting value IA was calculated by the following formula.
ｎ＝４（Ｉ＜256A） …(2)
ｎ＝１／32Ｉ−３（Ｉ≧256A） …(3)
第(2)式および第(3)式の計算は、第２図の演算・
記憶回路１１のマイクロコンピユータおよび記憶
素子に記憶されたプログラムにより実行される。
もちろん、第(2)式および第(3)式の特性はプログラ
ムにより容易に変化させることができる。 n=4 (I<256A) ...(2) n=1/32I-3 (I≧256A) ...(3) Calculation of equations (2) and (3) is performed using the calculations in Figure 2.
The program is executed by the microcomputer of the memory circuit 11 and the program stored in the memory element.
Of course, the characteristics of equations (2) and (3) can be easily changed by a program.
第(2)式および第(3)式によるCO2、マグ溶接時の
特性を第３図に示す。第３図において、a′は従来
例と同様のパルスマグ溶接時の特性を示し、b′は
CO2、マグ溶接時の特性を示している。なお、第
３図において、第(3)式の実行を整数計算するた
め、１／32Ｉの計算結果における小数点以下の数は
切捨てるようにプログラムされている。 FIG. 3 shows the characteristics during CO 2 and MAG welding according to equations (2) and (3). In Figure 3, a' indicates the characteristics during pulsed MAG welding similar to the conventional example, and b' indicates
CO 2 shows the characteristics during MAG welding. In FIG. 3, in order to perform integer calculations to execute equation (3), the program is programmed to round down numbers below the decimal point in the calculation result of 1/32I.
このように構成した結果、CO2、マグ溶接の同
一出力時に溶接性能を損うことなく溶接出力制御
用トランジスタ４の損失を減少させることができ
る。したがつて、溶接出力制御用トランジスタ４
の容量を大にすることなくCO2、マグ溶接時に最
大定格出力値の大なるトランジスタチヨツパ式溶
接電源を提供することができ、産業界への貢献は
多大である。 As a result of this configuration, it is possible to reduce the loss of the welding output control transistor 4 without impairing the welding performance at the same output for CO 2 and MAG welding. Therefore, the welding output control transistor 4
It is possible to provide a transistor chopper type welding power source with a large maximum rated output value during CO 2 and MAG welding without increasing the capacity of CO 2 , making it a great contribution to industry.
なお、パルスマグ溶接時の出力特性について
も、演算・記憶回路１１からの命令デジタル信号
ｎをプログラムに従つて出力設定器１２の設定値
Ｉに応じ減少させることにより実現できる。ま
た、実施例では、溶接出力制御用トランジスタ４
が溶接用変圧器の二次側に設けた場合について説
明したが、一次側に設けたものでも同様に適用で
きる。 Note that the output characteristics during pulsed mag welding can also be realized by decreasing the command digital signal n from the arithmetic/memory circuit 11 according to the set value I of the output setter 12 according to a program. In addition, in the embodiment, the welding output control transistor 4
Although the description has been made regarding the case where the welding transformer is provided on the secondary side, it can be similarly applied to the case where it is provided on the primary side.
発明の効果
この発明の溶接用電源によれば、CO2、マグ溶
接時の機器最大定格出力値をトランジスタの容量
を大にすることなく増加させることができる。Effects of the Invention According to the welding power source of the present invention, the maximum rated output value of the device during CO 2 and MAG welding can be increased without increasing the capacity of the transistor.
第１図は従来例におけるパルスマグ溶接時およ
びCO2、マグ溶接時の一周期時間のワイヤ送給量
に対する特性図、第２図はこの発明の一実施例の
回路図、第３図は実施例におけるパルスマグ溶接
時およびCO2、マグ溶接時の一周期時間の溶接出
力に対する特性図である。
１……溶接用変圧器、２……整流器、３……平
滑用コンデンサ、４……溶接出力制御用トランジ
スタ、５……リアクタ、６……溶接機出力端子、
７……溶接機入力端子、８……トランジスタ駆動
回路、９……分周カウンタ回路、１０……基準周
波数信号発生回路、１１……演算・記憶回路、１
２……溶接出力設定器、１３……出力特性切換
器。
Fig. 1 is a characteristic diagram of the wire feed amount during one cycle time during pulsed mag welding and CO 2 and mag welding in a conventional example, Fig. 2 is a circuit diagram of an embodiment of the present invention, and Fig. 3 is an embodiment. FIG. 2 is a characteristic diagram of welding output over one cycle time during pulsed mag welding and CO 2 and mag welding. 1... Welding transformer, 2... Rectifier, 3... Smoothing capacitor, 4... Welding output control transistor, 5... Reactor, 6... Welding machine output terminal,
7... Welding machine input terminal, 8... Transistor drive circuit, 9... Frequency division counter circuit, 10... Reference frequency signal generation circuit, 11... Arithmetic/memory circuit, 1
2... Welding output setting device, 13... Output characteristic switching device.
Claims (1)
がら溶接を行う消耗電極を用いた溶接機に用いら
れる溶接用電源であつて、 溶接用変圧器と、この溶接用変圧器の一次側ま
たは二次側に設けられて溶接出力を制御する溶接
出力制御用パワートランジスタと、溶接出力を設
定する溶接出力設定器と、前記溶接出力設定器の
設定値を演算して基準周期信号を発生する基準周
期発生回路と、前記基準周期発生回路の出力する
基準周期信号により前記溶接出力制御用パワート
ランジスタのオン−オフを制御する駆動回路とで
構成され、前記溶接出力設定器の設定値の増加に
伴つて前記基準周期信号の周期を増加させること
により前記溶接出力制御用パワートランジスタの
オン時間とオフ時間とで構成される一周期時間を
増加させることを特徴とする溶接用電源。 ２ 前記基準周期発生回路は、論理演算素子、記
憶素子、クロツク信号発生器および前記論理演算
素子のデジタル出力により前記クロツク信号を分
周して出力する分周素子を有している特許請求の
範囲第１項記載の溶接用電源。 ３ 消耗電極である溶接用ワイヤを自動送給しな
がら溶接を行う消耗電極を用いた溶接機に用いら
れる溶接用電源であつて、 溶接用変圧器と、この溶接用変圧器の一次側ま
たは二次側に設けられて溶接出力を制御する溶接
出力制御用パワートランジスタと、溶接出力を設
定する溶接出力設定器と、前記溶接出力設定器の
設定値と溶接出力特性を切換える切換器の出力と
を入力として演算して基準周期信号を発生する基
準周期発生回路と、前記基準周期信号により前記
溶接出力制御用パワートランジスタのオン−オフ
を制御する駆動回路とで構成され、前記溶接出力
設定器の設定値の増加に伴つて前記基準周期信号
の周期を増加させることにより前記溶接出力制御
用パワートランジスタのオン時間とオフ時間とで
構成される一周期時間を増加させる特性と前記溶
接出力設定器の設定値の増加に伴つて前記基準周
期信号の周期を減少させることにより前記一周期
時間を減少させる特性とを前記切換器で選択でき
ることを特徴とする溶接用電源。 ４ 前記基準周期発生回路は、論理演算素子、記
憶素子、クロツク信号発生器および前記論理演算
素子のデジタル出力により前記クロツク信号を分
周して出力する分周素子を有している特許請求の
範囲第１項記載の溶接用電源。[Scope of Claims] 1. A welding power source used in a welding machine using a consumable electrode that performs welding while automatically feeding a welding wire, which is a consumable electrode, comprising a welding transformer and the welding transformer. A welding output control power transistor that is provided on the primary or secondary side of the welding device to control the welding output, a welding output setting device that sets the welding output, and a reference period by calculating the setting value of the welding output setting device. It is composed of a reference period generation circuit that generates a signal, and a drive circuit that controls on/off of the welding output control power transistor based on the reference period signal outputted from the reference period generation circuit, and is configured to set the welding output setting device. A welding power source characterized in that one cycle time consisting of an on time and an off time of the welding output control power transistor is increased by increasing the cycle of the reference cycle signal as the value increases. 2. Claims in which the reference period generating circuit includes a logic operation element, a memory element, a clock signal generator, and a frequency division element that divides and outputs the frequency of the clock signal using the digital output of the logic operation element. The welding power source described in item 1. 3. A welding power source used in a welding machine using a consumable electrode that performs welding while automatically feeding a welding wire, which is a consumable electrode, and which includes a welding transformer and the primary or secondary side of this welding transformer. A welding output control power transistor provided on the next side to control the welding output, a welding output setting device to set the welding output, and an output of a switching device to switch the setting value of the welding output setting device and the welding output characteristics. It is comprised of a reference period generation circuit that calculates as an input and generates a reference period signal, and a drive circuit that controls on/off of the welding output control power transistor using the reference period signal, and a drive circuit that controls the on/off of the welding output control power transistor. A characteristic of increasing one cycle time consisting of an on time and an off time of the welding output control power transistor by increasing the cycle of the reference cycle signal as the value increases, and setting of the welding output setting device. The welding power source is characterized in that the switch can select a characteristic that reduces the one cycle time by decreasing the cycle of the reference cycle signal as the value increases. 4. Claims in which the reference period generating circuit includes a logic operation element, a memory element, a clock signal generator, and a frequency division element that divides and outputs the frequency of the clock signal using the digital output of the logic operation element. The welding power source described in item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58012314A JPS59137177A (en) | 1983-01-27 | 1983-01-27 | Power source for welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58012314A JPS59137177A (en) | 1983-01-27 | 1983-01-27 | Power source for welding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59137177A JPS59137177A (en) | 1984-08-07 |
| JPH0131991B2 true JPH0131991B2 (en) | 1989-06-28 |
Family
ID=11801851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58012314A Granted JPS59137177A (en) | 1983-01-27 | 1983-01-27 | Power source for welding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59137177A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4739641B2 (en) * | 2002-09-26 | 2011-08-03 | 株式会社ダイヘン | Power supply device for short-circuit arc welding and robot welding device |
-
1983
- 1983-01-27 JP JP58012314A patent/JPS59137177A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59137177A (en) | 1984-08-07 |
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