JPS5886977A - Electric power source for arc welding - Google Patents

Electric power source for arc welding

Info

Publication number
JPS5886977A
JPS5886977A JP18552481A JP18552481A JPS5886977A JP S5886977 A JPS5886977 A JP S5886977A JP 18552481 A JP18552481 A JP 18552481A JP 18552481 A JP18552481 A JP 18552481A JP S5886977 A JPS5886977 A JP S5886977A
Authority
JP
Japan
Prior art keywords
output
signal
switching circuit
welding
outputs
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.)
Pending
Application number
JP18552481A
Other languages
Japanese (ja)
Inventor
Akira Sakabe
坂部　昭
Takayuki Kashima
孝之 鹿島
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 JP18552481A priority Critical patent/JPS5886977A/en
Publication of JPS5886977A publication Critical patent/JPS5886977A/en
Pending legal-status Critical Current

Links

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
    • B23K9/067—Starting the arc
    • B23K9/0672—Starting the arc without direct contact between electrodes
    • B23K9/0673—Ionisation of the arc gap by means of a tension with a step front (pulses or high frequency tensions)

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)

Abstract

PURPOSE:To permit supplying of voltage with which immediate welding is possible in TIG welding as well by providing an error amplifier which amplifies the difference between a feedback output and a reference output and outputs an control signal to a control circuit, a comparator for the output control circuit and the wave from a normally operating saw tooth wave generator, a starting signal generator which receives and outputs a welding start signal, and a switching circuit which receives the starting signal and outputs the output control signal to the comparator. CONSTITUTION:A starting signal generator 11 is turned off and a switching circuit 12 is turned on. A saw tooth wave generator 9 is under oscillation, but since a switching circuit 12 is on, the actuation of a driving signal generator 10 by a comparator 8 is prohibited, and the output of an electric power source for arc welding is 0. In the stage of starting of welding, a starting signal generator 11 emits a starting signal on receiving of the welding start signal. Then, the circuit 12 goes off, and immediately the comparator 8 starts outputting the output control signal. Thus a switching circuit 2 operates immediately and voltage is supplied to load 5.

Description

【発明の詳細な説明】 本発明はアーク溶接用電源に関するものであり１、更に
詳しくは商用周波数よ抄も高い周波数を用いｔｉ　　　
　　　　　　　　　　　　　　　　　　　　　２　　　
、。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power source for arc welding.
2
,.

変圧器＠整流回路を介して溶接部に直流電流を供給する
アーク溶接用電源の改良に関するものである。This invention relates to an improvement of an arc welding power source that supplies direct current to a welding part via a transformer@rectifier circuit.

従来のアーク溶接用電源としては、その小形軽量化を目
的として、商用周波数よりも高い周波数に変換し、これ
を変圧器及び整流回路を介して負荷に供給するものが知
られている。第１図はかかる従来のアーク溶接用電源を
示すものである。同図において、整Ｉｔ＠路１は商用電
源Ｃｖを受け、これを直流に変換してスイッチング回路
２に出力する。スイッチング回路２は後述する駆動信号
発生器１０の出力する信号を受け、商用周波数よね高い
適宜の周波数のパルス電圧を発生する。変圧器５はこの
パルス電圧を溶接用電圧に変換し、ａｍＮ路４に出力す
る。整流回路４は、これを直流電圧に変換して負荷５に
供給する。負荷５において祉、負荷５に供給される電圧
が検出され、その値が１差増幅器４こ負帰還される。誤
差増幅器６＃′ｉ、基準電圧発生器７から出力される基
準電圧と負荷５からの帰還電圧との差を差信号として出
力し、この差信号は出力制御信号として比較−８の一方
の入力端子に入力される。比較器８の他方の入力端子に
は、鋸歯状波発生養９から出力される鋸−状波か入力さ
れている。比較器８は、出力制御信号が上記鋸虐状波よ
抄も大きい期間に限ってスイッチング回路２をオンさせ
るべく駆動信号発生器１０に信号を出力する。従って、
スイッチン・グー路２Ｆｉ、前記した様に駆動信号発生
＠１０の出力に応じて商用周波数より高い周波数のパル
ス電圧を出力する。2. Description of the Related Art Conventional arc welding power sources are known to convert the frequency to a higher frequency than the commercial frequency and supply this to a load via a transformer and a rectifier circuit in order to reduce the size and weight of the power source. FIG. 1 shows such a conventional arc welding power source. In the figure, a regulator It@path 1 receives a commercial power supply Cv, converts it into direct current, and outputs it to a switching circuit 2. The switching circuit 2 receives a signal output from a drive signal generator 10, which will be described later, and generates a pulse voltage having an appropriate frequency higher than the commercial frequency. The transformer 5 converts this pulse voltage into a welding voltage and outputs it to the amN path 4. The rectifier circuit 4 converts this into a DC voltage and supplies it to the load 5. The voltage supplied to the load 5 is detected at the load 5, and its value is negatively fed back to the 1-difference amplifier 4. The error amplifier 6#'i outputs the difference between the reference voltage output from the reference voltage generator 7 and the feedback voltage from the load 5 as a difference signal, and this difference signal is input to one input of the comparator 8 as an output control signal. input to the terminal. The other input terminal of the comparator 8 receives the sawtooth wave output from the sawtooth wave generator 9. The comparator 8 outputs a signal to the drive signal generator 10 to turn on the switching circuit 2 only during a period in which the output control signal is larger than the sawtooth wave. Therefore,
As described above, the switching path 2Fi outputs a pulse voltage having a frequency higher than the commercial frequency in response to the output of the drive signal generator @10.

上記した様なアーク溶接用電源は、一般に被覆アーク溶
接に用いられ、アーク触接装置の起動時に祉出力オンの
状態で待機させている。しかし、ＴＩＧ　溶接等の様に
トーチスイッチ等でアーク浴１［置を起動する方式にお
いてれ、上記従来のアーク＃装用電源はトーチスイッチ
等から出力される起動信号を鋸歯状波発生器９に入力し
て鋸−状波の発振を開始させた抄、また上記起動信号に
より図示しない制御回路を作動させる等して起動してい
る。そのため、従来のアーク溶接用電源は、鋸−状波発
生回路の動作の遅れによ抄溶接開始に必要な出力が得ら
れるまで時間がかかり、溶接開始が遅れるという欠点が
あった。The above-described power source for arc welding is generally used for shielded arc welding, and is kept on standby with the power output turned on when the arc contact device is started. However, as in TIG welding, the arc bath 1 is started using a torch switch, etc., and the conventional arc # equipment power source inputs the starting signal output from the torch switch etc. to the sawtooth wave generator 9. The device is started by starting the oscillation of the sawtooth wave, and by activating a control circuit (not shown) using the start signal. Therefore, the conventional arc welding power source has the disadvantage that it takes time to obtain the output necessary to start paper welding due to the delay in the operation of the sawtooth wave generating circuit, and the start of welding is delayed.

本発明はかかる従来のアーク溶接用電源の欠点に鑑みな
されたもので、ＴＩＧ溶接の様にトーチスイッチ等でア
ーク溶接装置を起動する場合にも、起動信号が出力され
ると同時に溶接開始に必要とされる出力が得られるアー
ク溶接用電源を提供することを目的としている。The present invention has been made in view of the drawbacks of the conventional arc welding power source, and even when starting an arc welding device with a torch switch etc. like TIG welding, the start signal is output and is necessary for starting welding. The purpose of this invention is to provide an arc welding power source that can provide the desired output.

本発明のアーク溶接用電源は、直流電圧を商用周波数よ
抄も高い周波数のパルス電圧に変換するスイッチング回
路と、上記スイッチング回路のオン・オフを制御する制
御回路を有し、上記スイッチング回路の出力を変圧器と
整流回路を介して直流出力とするアーク溶接用電源にお
いて、上記制御回路が帰還出力と基準出力の差（すなわ
ち、帰還電圧と基準電圧の差または帰還電流と基準電流
の差）を増幅し、出力制御信号を出力する誤差増幅器と
、該出力制御信号と常時作動状態にある鋸−状波発生器
から出力される鋸−状波とを比較すｇｉ る比較器と、トーチスイッチ等から出力される溶接開始
信号を受１起動信号を出力する起動信号発生器と、咳起
動信号を受は直ちに上記出力制御信号を上記比較器に入
力するスイッチング回路とを有していることを特徴とし
ている。The arc welding power source of the present invention includes a switching circuit that converts DC voltage into a pulse voltage with a frequency higher than the commercial frequency, and a control circuit that controls on/off of the switching circuit, and an output of the switching circuit. In an arc welding power source that outputs DC through a transformer and a rectifier circuit, the control circuit detects the difference between the feedback output and the reference output (i.e., the difference between the feedback voltage and the reference voltage or the difference between the feedback current and the reference current). an error amplifier that amplifies and outputs an output control signal; a comparator that compares the output control signal with a sawtooth wave output from a sawtooth wave generator that is constantly in operation; a torch switch, etc. A starting signal generator receives a welding start signal outputted from the welding start signal and outputs a starting signal, and a switching circuit receives the cough starting signal and immediately inputs the output control signal to the comparator. It is said that

以下添付の図面に示す実施例により、更に詳細に本発明
について説明する。第２図は本発明の一実施例であ抄、
第１図に示す従来のアーク溶接用電源と同一部分は同一
符号を付してその説明を°省略する。第１図に示す従来
の烏のと異なる部分は、起動信号発生＠１１とこの起動
信号発生器１１から出力される起動信号を受けてオシす
るスイッチング回路１２が設けられていゐ点である。以
下本実施例の動作について説明する。The present invention will be described in more detail below with reference to embodiments shown in the accompanying drawings. FIG. 2 shows an example of the present invention.
The same parts as those of the conventional arc welding power source shown in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted. The difference from the conventional crow shown in FIG. 1 is that a starting signal generator @11 and a switching circuit 12 which receives the starting signal outputted from the starting signal generator 11 and switches on the signal are provided. The operation of this embodiment will be explained below.

（１）被覆アーク溶接等の場合 この場合には、起動信号発生器１１を常時オンの状態に
保持して、スイッチング回路１２に起動信号を入力して
おく。従って、スイッチング回路１２＃′ｉ常にオフの
状態に保持され、第２図に示す実施例のアク溶接用電源
は実質的に第１図の従来のア−１ｒ り浩接用′＃Ｌ源と同様に作動する。(1) In the case of shielded arc welding, etc. In this case, the starting signal generator 11 is always kept on and the starting signal is input to the switching circuit 12. Therefore, the switching circuit 12#'i is always kept in the OFF state, and the AC welding power source of the embodiment shown in FIG. It works the same way.

（２１ＴＩＱ溶接等の場合 溶接開始前の待機時においては、起動信号発生器１１を
オフにしておき、スイッチング回路１２をオンにしてお
く。淘、この時鋸−状波発生器９線発振している。しか
し、スイッチング回路１２がオンしているため、比較器
８が駆動信号発生器１ｏを作動させることはない。従っ
て、この時アーク溶接用電源の出力祉零である。(In the case of 21TIQ welding, etc., during standby before starting welding, the starting signal generator 11 is turned off and the switching circuit 12 is turned on. At this time, the sawtooth wave generator 9-wire oscillation is performed. However, since the switching circuit 12 is on, the comparator 8 does not operate the drive signal generator 1o.Therefore, at this time, the output power of the arc welding power source is zero.

溶接開始時においては、図示しないトーチスイッチ等か
らの溶接開始信号により起動信号発生器１１が起動信号
を発生する。これによってスイッチング回路１２がオフ
となり、直ちに比較器８が出方制御４１信号の出力を開
始する。従って、直ちにスイッチング（ロ）路２が作動
を開始し、負荷５に電圧が供給される。At the time of starting welding, the starting signal generator 11 generates a starting signal in response to a welding starting signal from a torch switch (not shown) or the like. This turns off the switching circuit 12, and the comparator 8 immediately starts outputting the output control 41 signal. Therefore, the switching path 2 immediately starts operating, and voltage is supplied to the load 5.

同、第２図に示す実施例では、負荷５に供給される電圧
を負帰還しているが、これは電流信号でも良い。菫だ、
本発明は、この負帰還がなくても同様に夾施できるもの
である。In the embodiment shown in FIG. 2, the voltage supplied to the load 5 is negatively fed back, but this may also be a current signal. It's violet.
The present invention can equally be implemented without this negative feedback.

’　　　ｉｔ 以上の説明から明らかな様に、本発明によれば、ＴＩＧ
治接触接場合でも直ちに溶接可能な電圧を供給すること
が可能となり、溶接開始の遅れを防止することができる
効果がある。' it As is clear from the above explanation, according to the present invention, TIG
Even in the case of contact with the welding contact, it is possible to supply a voltage that enables immediate welding, which has the effect of preventing a delay in the start of welding.

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

第１図は従来のアーク溶接用電源の一例を示すブロック
図、第２図は本発明の一実施例を示すブロック図である
。 １．４・・・整流回路、２．１２パ°スイッチング回路
、３・・・変圧器、５・・・負荷、６・・・誤差増幅器
、７・・・基準電圧発生器、８・・・比較器、９・・・
鋸−状波発生益、１０・・駆動信号発生器、１１・・・
起動信号発生器。 特許出願人　　　日立精工株式会社 代理人弁理士　　　秋　本　正　実FIG. 1 is a block diagram showing an example of a conventional arc welding power source, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1.4... Rectifier circuit, 2.12 per degree switching circuit, 3... Transformer, 5... Load, 6... Error amplifier, 7... Reference voltage generator, 8... Comparator, 9...
Sawtooth wave generation gain, 10... Drive signal generator, 11...
Start signal generator. Patent applicant: Hitachi Seiko Co., Ltd. Representative Patent Attorney Masami Akimoto

Claims (1)

【特許請求の範囲】[Claims] 直流電圧を商用周波数よりも高い周波数のパルス電圧に
変換するスイッチング回路と、上記スイッチング回路の
オ／・オフを制御する制御回路を有し、上記スイッチン
グ回路の出力を変圧器と整流回路を介して直流出力とす
るアーク溶接用電源において、上記制御回路が、帰還出
力と基準出°力の差を増幅し、出力制御信号を出力する
誤差増幅器と、該出力制御信号と常時作動状態にある鋸
−状波発生養から出力される鋸−状波とを比較する比較
器と、トーチスイッチ等から出力される治績開始信号を
受は起動信号を出力する起動備考発生器と、該起動信号
を受は直ちに上記出力制御信号を上記比較器に入力する
スイッチング回路とを有して成ることを４Ｉ微とするア
ーク溶接装置。It has a switching circuit that converts DC voltage into a pulse voltage with a frequency higher than the commercial frequency, and a control circuit that controls on/off of the switching circuit, and outputs the output of the switching circuit through a transformer and a rectifier circuit. In an arc welding power source that outputs direct current, the control circuit includes an error amplifier that amplifies the difference between the feedback output and the reference output and outputs an output control signal, and a saw that is in constant operation in conjunction with the output control signal. A comparator that compares the sawtooth wave output from the wave generator, a start note generator that receives the start signal output from a torch switch, etc., and outputs a start signal, and a start note generator that receives the start signal. and a switching circuit for immediately inputting the output control signal to the comparator.
JP18552481A 1981-11-20 1981-11-20 Electric power source for arc welding Pending JPS5886977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18552481A JPS5886977A (en) 1981-11-20 1981-11-20 Electric power source for arc welding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18552481A JPS5886977A (en) 1981-11-20 1981-11-20 Electric power source for arc welding

Publications (1)

Publication Number Publication Date
JPS5886977A true JPS5886977A (en) 1983-05-24

Family

ID=16172299

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18552481A Pending JPS5886977A (en) 1981-11-20 1981-11-20 Electric power source for arc welding

Country Status (1)

Country Link
JP (1) JPS5886977A (en)

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