JPH02112881A - Power source for arc welding and cutting - Google Patents

Power source for arc welding and cutting

Info

Publication number
JPH02112881A
JPH02112881A JP26280688A JP26280688A JPH02112881A JP H02112881 A JPH02112881 A JP H02112881A JP 26280688 A JP26280688 A JP 26280688A JP 26280688 A JP26280688 A JP 26280688A JP H02112881 A JPH02112881 A JP H02112881A
Authority
JP
Japan
Prior art keywords
current
output
input
cutting
power source
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.)
Granted
Application number
JP26280688A
Other languages
Japanese (ja)
Other versions
JP2572433B2 (en
Inventor
Tsuneo Shinada
常夫 品田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Via Mechanics Ltd
Original Assignee
Hitachi Seiko Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Seiko Ltd filed Critical Hitachi Seiko Ltd
Priority to JP26280688A priority Critical patent/JP2572433B2/en
Publication of JPH02112881A publication Critical patent/JPH02112881A/en
Application granted granted Critical
Publication of JP2572433B2 publication Critical patent/JP2572433B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Arc Welding Control (AREA)

Abstract

PURPOSE:To reduce the size and weight over the entire part of the power source device for arc welding and cutting by controlling the output of an inverter by a current control means in such a manner as to increase or decrease the output current to a load in synchronization with the momentary increase or decrease of an AC input voltage. CONSTITUTION:The AC input from a single-phase AC power source 1 is subjected to current rectification by a full-wave current rectifying circuit 2. The current rectified output is converted to high-frequency AC by an inverter main circuit 4 and after this current is dropped by a voltage transformer 5, the secondary output of the transformer is subjected again to the current rectification in a full-wave current rectifying circuit 6. This output is supplied via a DC reactor 7 to the arc load 8. The output of the inverter main circuit 4 is so controlled by the current control means as to be increased or decreased in nearly synchronization with the increase or decrease of the momentary value of the AC input voltage. The size and weight over the entire part of the power source device for arc welding and cutting are reduced in this way.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本願発明はインバータ制御によるアーク溶接、切断用電
源に係り、特に単相100 V人力のような容量の小さ
い交流入力で使用するのに好適なアーク溶接、切断用電
源に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an inverter-controlled arc welding and cutting power source, and is particularly suitable for use with a small-capacity AC input such as single-phase 100 V human power. Regarding arc welding and cutting power supplies.

〔従来の技術〕[Conventional technology]

従来、インバータ制御による単相入力のアーク溶接、切
断用電源においては、第2図に示すように制御用直流電
源20の定電圧出力21を電流設定器11により分圧し
て出力電流の設定を行っていた。
Conventionally, in a single-phase input arc welding and cutting power supply controlled by an inverter, the output current is set by dividing the constant voltage output 21 of the control DC power supply 20 by a current setting device 11, as shown in FIG. was.

単相交流電R1からの商用周波数の交流入力は全波整流
回路2と大容量の平滑用コンデンサ3により直流に変換
され、インバータ主回路4で直流から高周波交流に変換
される。この高周波交流出力は変圧器5で降圧された後
、全波整流回路6で再度直流に変換され、直流リアクタ
7を経てアーク負荷8に供給される。電流検出器12で
検出された出力電流値のフィードバック信号23と電流
設定器11からの基準電圧22は比較増幅器13で比較
され、比較増幅器13の出力をインバータ駆動回路14
でPW M Ill ?11信号に変換してインバータ
主回路4を構成す6z<’MOS F ET等。素子を
ユイッヶ、グ動作させることにより、電流設定器11の
設定値に応じた出力電流が流れるようにしている。
A commercial frequency AC input from the single-phase AC power R1 is converted to DC by a full-wave rectifier circuit 2 and a large-capacity smoothing capacitor 3, and then converted from DC to high-frequency AC by an inverter main circuit 4. After this high frequency AC output is stepped down by a transformer 5, it is again converted to DC by a full wave rectifier circuit 6, and is supplied to an arc load 8 via a DC reactor 7. A feedback signal 23 of the output current value detected by the current detector 12 and a reference voltage 22 from the current setter 11 are compared in a comparator amplifier 13, and the output of the comparator amplifier 13 is applied to an inverter drive circuit 14.
And PWM Ill? 11 signals and configure the inverter main circuit 4. 6z<' MOS FET etc. An output current corresponding to the setting value of the current setting device 11 is caused to flow by causing the element to operate rapidly.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来技術では、アーク負荷への出力電流、交流入力
電圧、交流入力電圧を整流、平滑した直流入力電圧およ
び平滑用コンデンサ3に流れる入力電流の関係は第3図
(a)〜(d)に示すようになり、入力電流(d)がパ
ルス状の波形となるため、入力電源に対する力率は非常
に悪く、通常60%程度である。したがって、単相10
0■電源のような入力容量の限られた電源を用いる場合
、力率が悪いことと相まって出力電流を大きくとれず、
そのため、単相100■入力の溶接機や切断機は能力を
十分に生かせなかった。
In the above conventional technology, the relationships among the output current to the arc load, the AC input voltage, the DC input voltage obtained by rectifying and smoothing the AC input voltage, and the input current flowing through the smoothing capacitor 3 are shown in FIGS. 3(a) to (d). As shown, since the input current (d) has a pulse-like waveform, the power factor with respect to the input power source is very poor, and is usually about 60%. Therefore, single phase 10
0■ When using a power supply with limited input capacity, such as a power supply, it is difficult to obtain a large output current due to the poor power factor.
Therefore, welding machines and cutting machines with a single-phase 100μ input were not able to make full use of their capabilities.

本発明の目的は、入力電流の力率を改善することにより
、容量の限られた単相入力で出力電流を十分大きくとれ
るアーク溶接、切断用電源を提供することにある。
An object of the present invention is to provide a power source for arc welding and cutting that can obtain a sufficiently large output current with a single-phase input having a limited capacity by improving the power factor of the input current.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために本発明は、単相交流入力を整
流し、その整流出力をインバータにより高周波交流に変
換して変圧器一次側に加え、変圧器二次出力を再度整流
して負荷に供給するアーク溶接、切断電源において、負
荷への出力電流を交流入力電圧の瞬時値の増減にほぼ同
期して増減させるように、前記インバータの出力を制御
する電流制御手段を備えたことを特徴とする。
To achieve the above object, the present invention rectifies single-phase AC input, converts the rectified output into high-frequency AC using an inverter, and applies it to the primary side of the transformer, and rectifies the secondary output of the transformer again to supply the load. The arc welding and cutting power source supplied includes current control means for controlling the output of the inverter so that the output current to the load increases or decreases substantially in synchronization with the increase or decrease in the instantaneous value of the AC input voltage. do.

〔作用〕[Effect]

従来のインバータ制御による単相入力のアーク溶接、切
断用電源は、入力電流の力率が三相入力のものに比べ約
20%低く、60%台であった。
Conventional inverter-controlled single-phase input arc welding and cutting power supplies have an input current power factor of about 60%, which is about 20% lower than that of three-phase input power supplies.

これを90%台にできれば、出力電流は1.5倍にする
ことができる。一方、ティグ溶接、被覆アーク溶接、プ
ラズマアーク切断などでは、出力電流が完全な直流でな
く、脈流であっても、性能上の問題は少ない。
If this can be made into the 90% range, the output current can be increased by 1.5 times. On the other hand, in TIG welding, shielded arc welding, plasma arc cutting, etc., there are few performance problems even if the output current is not a complete direct current but a pulsating current.

本発明はこれらの点に着目してなされたもので、第4図
に示すように、出力電流(a)を交流入力電圧(b)の
瞬時値の増減にほぼ同期して増減させることで、直流入
力電流(d)も交流入力電圧(a)の瞬時値の増減にほ
ぼ同期して増減する波形となり、第3図(d)に示す従
来の入力電流波形に比べ、力率が大幅に改善される。そ
の結果、同じ人力容量で十分大きな出力電流を得ること
ができ、単相100■入力のアーク溶接、切断用電源の
能力を従来の約1.5倍に向上させることができる。
The present invention has been made with attention to these points, and as shown in FIG. The DC input current (d) also has a waveform that increases and decreases almost in synchronization with the increase and decrease in the instantaneous value of the AC input voltage (a), and the power factor is significantly improved compared to the conventional input current waveform shown in Figure 3 (d). be done. As a result, a sufficiently large output current can be obtained with the same human power capacity, and the capacity of a single-phase 100-input arc welding and cutting power source can be improved to about 1.5 times that of the conventional one.

〔実施例〕〔Example〕

以下、本発明の一実施例を第1図により説明する。 An embodiment of the present invention will be described below with reference to FIG.

単相交流電源1からの商用周波数の交流入力を全波整流
回路2で整流した後、平滑用コンデンサ3により部分平
滑する。出力電流を交流入力電圧にほぼ同期した脈流波
形としているため、直流入力電圧は完全な直流とする必
要はなく、交流入力電圧零点でアーク切れが生じない程
度に部分平滑すればよい。したがって、平滑用コンデン
サ3の容量は、同じ入力容量の従来機より小さくて良い
A commercial frequency AC input from a single-phase AC power supply 1 is rectified by a full-wave rectifier circuit 2, and then partially smoothed by a smoothing capacitor 3. Since the output current has a pulsating waveform that is approximately synchronized with the AC input voltage, the DC input voltage does not need to be completely DC, but may be partially smoothed to the extent that arc breakage does not occur at the zero point of the AC input voltage. Therefore, the capacitance of the smoothing capacitor 3 may be smaller than that of a conventional device having the same input capacitance.

部分平滑した直流入力電圧をインバータ主回路4で高周
波交流(例えば20 kHz)に変換し、これを変圧器
5で適当な電圧に降圧した後、変圧器二次出力を全波整
流回路6で再度整流し、直流リアクタ7を経てアーク負
荷8に供給する。
The partially smoothed DC input voltage is converted into high-frequency AC (for example, 20 kHz) by the inverter main circuit 4, and this is stepped down to an appropriate voltage by the transformer 5.The secondary output of the transformer is then converted again by the full-wave rectifier circuit 6. It is rectified and supplied to an arc load 8 via a DC reactor 7.

電流制御手段は次のように構成されている。単相交流電
源1からの交流入力電圧を制御用トランス9で降圧した
後、全波整流回路10で整流し、その出力電圧16を無
平滑のまま電流設定器11に加え、分圧する。したがっ
て、電流設定器11の出力電圧は、交流入力電圧の瞬時
値の増減に同期して増減する値となる。この電流設定器
11の出力電圧にバイアス電源15からの一定の直流バ
イアス17を加え合せ、電流設定器11の設定値に応じ
た基準電圧18とする。シャント抵抗のような電流検出
器12で検出した出力電流値のフィードバック信号19
と前記基準電圧18とを比較増幅器13で比較し、比較
増幅器13の出力をインバータ駆動回路14でPWM制
御信号に変換し、インバータ主回路4を構成するパワー
MOSFET等の素子をスイッチング動作させることに
より、電流設定器11の設定値に応じた出力電流がアー
ク負荷8に流れるようにする。
The current control means is constructed as follows. After the AC input voltage from the single-phase AC power supply 1 is stepped down by the control transformer 9, it is rectified by the full-wave rectifier circuit 10, and the output voltage 16 is applied without smoothing to the current setting device 11 for voltage division. Therefore, the output voltage of the current setting device 11 has a value that increases or decreases in synchronization with the increase or decrease in the instantaneous value of the AC input voltage. A constant DC bias 17 from a bias power supply 15 is added to the output voltage of this current setting device 11 to obtain a reference voltage 18 corresponding to the setting value of the current setting device 11. Feedback signal 19 of the output current value detected by the current detector 12 such as a shunt resistor
and the reference voltage 18 in a comparator amplifier 13, the output of the comparator amplifier 13 is converted into a PWM control signal in an inverter drive circuit 14, and elements such as power MOSFETs constituting the inverter main circuit 4 are operated to switch. , so that an output current according to the setting value of the current setting device 11 flows to the arc load 8.

上記構成によれば、アーク負荷への出力電流、交流入力
電圧、交流入力電圧を整流、平滑した直流入力電圧およ
び平滑用コンデンサ3に流れる入力端子の関係は第4図
(a)〜(d)に示すようになり、出力電流(a)は交
流入力電圧(b)の瞬時値の増減にほぼ同期して増減す
るため、平滑用コンデンサ3の容量を適当に選定すれば
、入力端子(d)も交流入力電圧(b)の瞬時値の増減
にほぼ同期して増減する波形となり、その力率は従来に
比べて大幅に改善される。
According to the above configuration, the relationship between the output current to the arc load, the AC input voltage, the DC input voltage obtained by rectifying and smoothing the AC input voltage, and the input terminal flowing to the smoothing capacitor 3 is as shown in FIGS. 4(a) to (d). As shown in , the output current (a) increases and decreases almost in synchronization with the increase and decrease of the instantaneous value of the AC input voltage (b), so if the capacity of the smoothing capacitor 3 is appropriately selected, The waveform also increases and decreases almost in synchronization with the increase and decrease in the instantaneous value of the AC input voltage (b), and its power factor is significantly improved compared to the conventional one.

ここで、平滑用コンデンサ3の容量をあまり小さくした
り、交流入力電圧零点での電流設定値を零にしたりする
と、アーク切れを生じる恐れがあるが、コンデンサ容量
の適当な選定と、基準電圧18への直流バイアスの付加
によって、アーク安定に必要な最低電流値(Imin)
を保持させることができる。また、アーク切れ防止のた
めには、アーク負荷への出力端において、図示しない別
の直流電源からI ll1inに見合った電流を加え合
わせる方法もある。
Here, if the capacitance of the smoothing capacitor 3 is too small or if the current setting value at the zero point of the AC input voltage is set to zero, there is a risk of arc breakage. By adding a DC bias to the minimum current value (Imin) required for arc stabilization,
can be held. Furthermore, in order to prevent arc breakage, there is also a method of adding a current corresponding to Ill1in from another DC power source (not shown) at the output end to the arc load.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、インバータ制御による単相入力のアー
ク溶接、切断用電源において、従来60%台と低かった
入力端子の力率を大幅に改善でき、結果として単相10
0V入力のように入力容量が限定されている場合の出力
電流を十分大きくとれ、溶接、切断の能力を向上させる
ことができる。
According to the present invention, in a single-phase input arc welding and cutting power source controlled by an inverter, the power factor of the input terminal, which was conventionally as low as 60%, can be significantly improved, resulting in a single-phase 10% power factor.
When the input capacity is limited such as 0V input, the output current can be made sufficiently large, and the welding and cutting ability can be improved.

さらに付加的効果として力率の改善により電力契約料金
が安価になり、また平滑用コンデンサの容量が小さくて
よいので、電源装置全体として小形、軽量かつ安価にな
る。
Furthermore, as an additional effect, power contract charges are reduced by improving the power factor, and since the capacitance of the smoothing capacitor may be small, the power supply device as a whole becomes smaller, lighter, and cheaper.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例の回路ブロック図、第2図は
従来例の回路ブロック図、第3図は第2図の各部の電圧
、電流波形図、第4図は第1図の各部の電圧、電流波形
図である。 1−単相交流電源、2−全波整流回路、3−平滑用コン
デンサ、4−・−インバータ主回路、5−・−変圧器、
6−・・全波整流回路、7−・直流リアクタ、8アーク
負荷、9・−制御用トランス、10−・全波整流回路、
11−電流設定器、12−電流検出器、13比較増幅器
、14・−インバータ駆動回路、15−バイアス電源。
FIG. 1 is a circuit block diagram of an embodiment of the present invention, FIG. 2 is a circuit block diagram of a conventional example, FIG. 3 is a voltage and current waveform diagram of each part of FIG. 2, and FIG. It is a voltage and current waveform diagram of each part. 1-Single-phase AC power supply, 2-Full-wave rectifier circuit, 3-Smoothing capacitor, 4--Inverter main circuit, 5--Transformer,
6-・Full-wave rectifier circuit, 7-・DC reactor, 8-arc load, 9-・Control transformer, 10-・Full-wave rectifier circuit,
11 - current setter, 12 - current detector, 13 comparison amplifier, 14 - inverter drive circuit, 15 - bias power supply.

Claims (1)

【特許請求の範囲】[Claims] 1、単相交流入力を整流し、その整流出力をインバータ
により高周波交流に変換して変圧器一次側に加え、変圧
器二次出力を再度整流して負荷に供給するアーク溶接、
切断用電源において、負荷への出力電流を交流入力電圧
の瞬時値の増減にほぼ同期して増減させるように、前記
インバータの出力を制御する電流制御手段を備えたこと
を特徴とするアーク溶接、切断用電源。
1. Arc welding that rectifies single-phase AC input, converts the rectified output into high-frequency AC using an inverter, applies it to the primary side of the transformer, rectifies the secondary output of the transformer again, and supplies it to the load;
Arc welding, characterized in that the cutting power source is equipped with a current control means for controlling the output of the inverter so that the output current to the load is increased or decreased substantially in synchronization with the increase or decrease in the instantaneous value of the AC input voltage. Power supply for cutting.
JP26280688A 1988-10-20 1988-10-20 Power supply for arc welding and cutting Expired - Lifetime JP2572433B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26280688A JP2572433B2 (en) 1988-10-20 1988-10-20 Power supply for arc welding and cutting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26280688A JP2572433B2 (en) 1988-10-20 1988-10-20 Power supply for arc welding and cutting

Publications (2)

Publication Number Publication Date
JPH02112881A true JPH02112881A (en) 1990-04-25
JP2572433B2 JP2572433B2 (en) 1997-01-16

Family

ID=17380869

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26280688A Expired - Lifetime JP2572433B2 (en) 1988-10-20 1988-10-20 Power supply for arc welding and cutting

Country Status (1)

Country Link
JP (1) JP2572433B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0634870U (en) * 1992-10-01 1994-05-10 川崎重工業株式会社 Welding power stabilization device for welding robot
JP2002364261A (en) * 2001-06-08 2002-12-18 Okamura Corp Revolving panel for continuously connecting partition device
JP2006202605A (en) * 2005-01-20 2006-08-03 Kanken Techno Co Ltd Power source for plasma harmful substance removing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0634870U (en) * 1992-10-01 1994-05-10 川崎重工業株式会社 Welding power stabilization device for welding robot
JP2002364261A (en) * 2001-06-08 2002-12-18 Okamura Corp Revolving panel for continuously connecting partition device
JP2006202605A (en) * 2005-01-20 2006-08-03 Kanken Techno Co Ltd Power source for plasma harmful substance removing machine

Also Published As

Publication number Publication date
JP2572433B2 (en) 1997-01-16

Similar Documents

Publication Publication Date Title
JP2559033Y2 (en) Ballast for gas discharge lamp
JP2000015443A (en) Arc working power unit
JP3390688B2 (en) DC power supply
JP3368776B2 (en) TIG welding machine
JPH02112881A (en) Power source for arc welding and cutting
JPH0371218B2 (en)
JPH0241778A (en) Inverter welding machine
JPH0580311B2 (en)
JP4275223B2 (en) Power supply
JPS61216859A (en) Power source for arc welding
JP2000125548A (en) Switching power unit
JPH0851774A (en) Switching power supply circuit
JP2004166374A (en) Power supply
US20230311230A1 (en) Cancellation of the effects of primary voltage variations
JP2802529B2 (en) Discharge lamp lighting device
JPH049089Y2 (en)
JPS58107267A (en) Electric power source for welding
JP2523513B2 (en) Voltage detector for welding current and power supply for welding
JPH0318059Y2 (en)
JPH0386377A (en) Wire energizing type tig welding equipment
JPH0349809Y2 (en)
JPH02100294A (en) Controlling method and unit for power source for x-ray
JPS5970471A (en) Pulse arc welding machine
JPH07176271A (en) Rf power supply
JPH03275277A (en) Power source for arc machining

Legal Events

Date Code Title Description
S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313113

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R371 Transfer withdrawn

Free format text: JAPANESE INTERMEDIATE CODE: R371

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313113

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R371 Transfer withdrawn

Free format text: JAPANESE INTERMEDIATE CODE: R371

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313113

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20071024

Year of fee payment: 11

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081024

Year of fee payment: 12

EXPY Cancellation because of completion of term