JP6345490B2 - Power supply for welding - Google Patents
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- 238000003466 welding Methods 0.000 title claims description 127
- 238000001514 detection method Methods 0.000 claims description 15
- 238000010248 power generation Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000010363 phase shift Effects 0.000 claims description 4
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- 230000002195 synergetic effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 239000004065 semiconductor Substances 0.000 description 2
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Description
本発明は、電流センサを用いた出力制御を行う溶接用電源装置に関する。 The present invention relates to a welding power source apparatus that performs output control using a current sensor.
特許文献１に開示の電源装置等、出力電流値を検出する電流センサを設置し、該電流センサにて検出した出力電流値に基づいてインバータ回路のスイッチング動作を制御し、所望の出力電力とする出力制御を行う構成となっている。 A current sensor that detects an output current value, such as the power supply device disclosed in Patent Document 1, is installed, and the switching operation of the inverter circuit is controlled based on the output current value detected by the current sensor to obtain a desired output power. It is configured to perform output control.
ところで、電流センサは電流値の検出範囲が仕様毎に決まっているため、例えば出力電流値が数百［Ａ］の大電流から数［Ａ］の極小電流まで大きく変化するアーク溶接用電源装置等、出力電流値が大きく変化する電源装置では特に、全範囲を適切に検出可能な電流センサを選定するのが難しい。 By the way, since the detection range of the current value of the current sensor is determined for each specification, for example, an arc welding power supply device in which the output current value greatly changes from a large current of several hundreds [A] to a minimal current of several [A]. Especially, in a power supply device in which the output current value changes greatly, it is difficult to select a current sensor that can appropriately detect the entire range.
例えば、大電流から極小電流までの広い電流域を検出可能な電流センサを用いる場合、電流センサの分解能が粗い設定となっていることから、分解能の限界に近い数［Ａ］程度の極小電流域での検出精度は低く、極小電流域では適切な出力制御が行えない。反対に、極小電流域に適した分解能の細かい電流センサでは検出可能な電流域が狭く、数百［Ａ］の大電流域までは検出不能、つまり使用ができなかった。 For example, when using a current sensor capable of detecting a wide current range from a large current to a minimum current, the resolution of the current sensor is set to be coarse, so a minimum current range of about several [A] that is close to the resolution limit. The detection accuracy in is low, and appropriate output control cannot be performed in the minimum current region. On the other hand, a current sensor with a fine resolution suitable for a very small current region has a narrow detectable current range, and cannot detect a large current region of several hundreds [A], that is, cannot be used.
本発明は、上記課題を解決するためになされたものであって、その目的は、広い電流域に亘って出力電流値を適切に検出でき、全域で適切な出力制御を行うことができる溶接用電源装置を提供することにある。 The present invention has been made in order to solve the above-described problems, and its purpose is for welding capable of appropriately detecting an output current value over a wide current region and performing appropriate output control over the entire region. It is to provide a power supply device.
上記課題を解決する溶接用電源装置は、出力電力を生成する電力生成回路と、出力電流値を検出する電流センサと、前記検出した出力電流値に基づいて前記電力生成回路を制御し所望の出力電力を得る出力制御を行う制御回路を備え、溶接対象の溶接を行うべく溶接トーチに前記出力電力を供給する溶接用電源装置であって、前記電流センサには、検出可能な電流域と分解能とを含む仕様の異なるものが複数用いられ、出力仕様の異なる複数の前記溶接トーチの内で出力仕様が大きい程、検出可能な電流域が広く分解能の粗い仕様の電流センサにて前記出力電流値の検出が行われ、前記溶接トーチの内で出力仕様が小さい程、検出可能な電流域が狭く分解能の細かい仕様の電流センサにて前記出力電流値の検出が行われるように、前記溶接トーチの出力仕様に対応して複数の電流センサの内の何れかを選択的に切り替えるセンサ切替手段と、溶接用電源装置と前記溶接トーチとの電気的接続に基づいて前記溶接トーチの出力仕様が自動判別される判別手段とを備える。 A welding power supply that solves the above problems includes a power generation circuit that generates output power, a current sensor that detects an output current value, and controls the power generation circuit based on the detected output current value to achieve a desired output. A welding power supply device that includes a control circuit that performs output control to obtain power and supplies the output power to a welding torch to perform welding of a welding target, the current sensor including a detectable current range and resolution A plurality of welding torches having different output specifications are used. The smaller the output specification in the welding torch, the smaller the current range that can be detected, and the detection of the output current value with a current sensor with a detailed resolution. And selectively switches sensor switch means one of the plurality of current sensors in response to the output specifications of the switch, the output specification of the welding torch on the basis of the electrical connection between the welding torch and the welding power supply device Discriminating means for automatically discriminating .
この構成によれば、溶接トーチの内で出力仕様が大きいものを用いると、検出可能な電流域が広く分解能の粗い仕様の電流センサが選択され、溶接トーチの内で出力仕様が小さいものを用いると、検出可能な電流域が狭く分解能の細かい仕様の電流センサが選択されて、各電流センサにて検出した出力電流値に基づく出力制御が行われる。つまり、広い電流域を扱う溶接用電源装置では、溶接トーチの出力仕様、即ち溶接トーチで扱う各電流域に適した電流センサが選択されることで各電流域の出力電流値を適切に検出でき、各電流域毎で適切な出力制御を行うことが可能となる。
また、この構成によれば、溶接用電源装置と溶接トーチとの電気的接続により、溶接トーチの出力仕様が自動判別されるため、出力仕様の判別が簡易で確実である。
According to this configuration, when a welding torch having a large output specification is used, a current sensor having a wide detectable current range and a coarse resolution is selected, and a welding torch having a small output specification is used. Then, a current sensor having a narrow detectable current range and a fine resolution is selected, and output control based on the output current value detected by each current sensor is performed. In other words, in a welding power supply that handles a wide current range, it is possible to appropriately detect the output current value of each current range by selecting the output specifications of the welding torch, that is, the current sensor suitable for each current range handled by the welding torch. Thus, it is possible to perform appropriate output control for each current region.
Further, according to this configuration, since the output specification of the welding torch is automatically determined by the electrical connection between the welding power supply device and the welding torch, the determination of the output specification is simple and reliable.
また上記の溶接用電源装置において、前記電力生成回路は、スイッチング素子のオンオフ動作により直流電力から高周波交流電力への電力変換を行うインバータ回路を含んで構成され、前記制御回路は、出力要求が大となる期間では前記インバータ回路のスイッチング素子のオンパルス幅を可変とするパルス幅変調制御を選択し、出力要求が小となる期間では同組で動作するスイッチング素子のオンパルス幅を所定幅に固定しつつ同組のオンパルスに位相差を生じさせる位相シフト制御に切り替える制御切替手段を備え、前記溶接トーチの出力仕様に応じたスイッチング制御を実施することが好ましい。 In the above welding power supply apparatus, the power generation circuit includes an inverter circuit that performs power conversion from DC power to high-frequency AC power by an on / off operation of a switching element, and the control circuit has a large output demand. The pulse width modulation control that makes the on-pulse width of the switching element of the inverter circuit variable is selected during the period, and the on-pulse width of the switching elements operating in the same group is fixed to a predetermined width during the period when the output request is small. It is preferable to provide control switching means for switching to phase shift control that causes a phase difference in the same set of on pulses, and to perform switching control according to the output specifications of the welding torch.
この構成によれば、インバータ回路のスイッチング制御において、出力要求の大きい期間ではパルス幅変調制御（ＰＷＭ制御）が実施され、出力要求が小さい期間になると位相シフト制御（ＰＳＭ制御）に切り替えられる。つまり、出力要求の小さい期間でＰＷＭ制御を実施したとするとインバータ回路のスイッチング素子が十分にオンできない虞があるが、これに代わってＰＳＭ制御を用いることでスイッチング素子のオンパルス幅を十分オン可能な所定幅としつつも出力を下げることが可能である。これにより、ＰＷＭ制御とＰＳＭ制御とを切り替えることで広い電流域での適切な出力制御が可能で、電流センサを切り替える上記構成との組み合わせによる相乗的効果が期待できる。 According to this configuration, in the switching control of the inverter circuit, the pulse width modulation control (PWM control) is performed during a period when the output request is large, and is switched to the phase shift control (PSM control) when the output request is small. In other words, if PWM control is performed in a period when the output request is small, there is a possibility that the switching element of the inverter circuit cannot be sufficiently turned on, but the on-pulse width of the switching element can be sufficiently turned on by using PSM control instead. It is possible to reduce the output while maintaining a predetermined width. Thereby, appropriate output control in a wide current range is possible by switching between PWM control and PSM control, and a synergistic effect can be expected by a combination with the above configuration for switching the current sensor.
また上記の溶接用電源装置において、前記センサ切替手段は、複数の前記電流センサ毎の電路を並列接続し、何れの電路を選択的に接続するかで前記電流センサを切り替える回路を含んで構成されることが好ましい。 In or above the welding power supply device, said sensor switch means, connected in parallel a plurality of paths for each of the current sensors, including a circuit for switching the current sensor or selectively connecting any electrical path structure It is preferred that
この構成によれば、電流センサを切り替える回路は、並列接続した電流センサ毎の電路を選択的に接続するかで切り替えを行う構成である。つまり、各電路上には各電流センサの耐性に合った電流が流れるため、電流センサの保護等の効果が期待できる。 According to this structure, the circuit which switches a current sensor is a structure which switches according to selectively connecting the electric circuit for every current sensor connected in parallel. That is, since a current that matches the resistance of each current sensor flows on each electric circuit, an effect such as protection of the current sensor can be expected.
また上記の溶接用電源装置において、プラズマアーク溶接用の出力電力を生成するように構成されることが好ましい。
この構成によれば、プラズマアーク溶接用の電源装置において、広い電流域に亘って適切な出力制御が行われる。
The welding power supply device is preferably configured to generate output power for plasma arc welding.
According to this configuration, in the power supply device for plasma arc welding, appropriate output control is performed over a wide current range.
本発明の溶接用電源装置によれば、広い電流域に亘って出力電流値を適切に検出でき、全域で適切な出力制御を行うことができる。 According to the welding power supply device of the present invention, the output current value can be appropriately detected over a wide current range, and appropriate output control can be performed over the entire range.
以下、溶接用電源装置の一実施形態について説明する。
図１に示すように、本実施形態の溶接用電源装置１０は、一次側変換回路１１、インバータ回路１２、溶接トランスＩＮＴ、二次側変換回路１３を備えるアーク溶接用電源装置よりなり、商用電源から供給される三相の交流入力電力からアーク溶接に適した直流出力電力を生成する。
Hereinafter, an embodiment of a welding power supply device will be described.
As shown in FIG. 1, the welding power supply device 10 of the present embodiment includes an arc welding power supply device including a primary side conversion circuit 11, an inverter circuit 12, a welding transformer INT, and a secondary side conversion circuit 13. The DC output power suitable for arc welding is generated from the three-phase AC input power supplied from the AC.
一次側変換回路１１は、整流回路ＤＲ１及び平滑コンデンサＣ１を備え、交流入力電力を一旦直流電力に変換してインバータ回路１２に出力する。インバータ回路１２は、ＩＧＢＴ等の半導体スイッチング素子ＴＲ１〜ＴＲ４を用いたブリッジ回路にて構成され、スイッチング素子ＴＲ１〜ＴＲ４によるスイッチング動作にて直流電力を高周波交流電力に変換する。これらスイッチング素子ＴＲ１〜ＴＲ４に対しては、制御回路２０による出力制御としてスイッチング制御（ＰＷＭ制御及びＰＳＭ制御）が実施される。インバータ回路１２は、生成した高周波交流電力を溶接トランスＩＮＴに出力する。 The primary side conversion circuit 11 includes a rectifier circuit DR1 and a smoothing capacitor C1, and once converts AC input power into DC power and outputs the DC power to the inverter circuit 12. The inverter circuit 12 is configured by a bridge circuit using semiconductor switching elements TR1 to TR4 such as IGBTs, and converts DC power into high frequency AC power by a switching operation by the switching elements TR1 to TR4. For these switching elements TR1 to TR4, switching control (PWM control and PSM control) is performed as output control by the control circuit 20. The inverter circuit 12 outputs the generated high-frequency AC power to the welding transformer INT.
溶接トランスＩＮＴは、インバータ回路１２から出力される高周波交流電力を二次側交流電力に変換して二次側変換回路１３に出力する。二次側変換回路１３は、整流回路ＤＲ２及び直流リアクトルＤＣＬを備え、二次側交流電力をアーク溶接に適した直流出力電力に変換する。そして、電源装置１０のプラス側出力端子に溶接トーチＴＨ１〜ＴＨ３を、マイナス側出力端子に溶接対象Ｍをそれぞれ接続し、電源装置１０にて生成した出力電力に基づき溶接トーチＴＨ１〜ＴＨ３の電極と溶接対象Ｍとの間にアークを生じさせ、溶接対象Ｍのアーク溶接が行われる。本実施形態の電源装置１０は、大出力用の溶接トーチＴＨ１、中出力用の溶接トーチＴＨ２、小出力用の溶接トーチＴＨ３というように、出力の異なる仕様のトーチの何れが接続されるかで、内部の動作態様を変更する構成となっている（詳細は後述）。 The welding transformer INT converts the high-frequency AC power output from the inverter circuit 12 into secondary AC power and outputs the secondary AC power to the secondary conversion circuit 13. The secondary side conversion circuit 13 includes a rectifier circuit DR2 and a DC reactor DCL, and converts the secondary side AC power into DC output power suitable for arc welding. Then, the welding torch TH1 to TH3 is connected to the plus side output terminal of the power supply device 10, the welding object M is connected to the minus side output terminal, and the electrodes of the welding torch TH1 to TH3 based on the output power generated by the power supply device 10 An arc is generated between the welding object M and arc welding of the welding object M is performed. The power supply device 10 according to the present embodiment determines which one of the torches having different specifications such as a welding torch TH1 for high output, a welding torch TH2 for medium output, and a welding torch TH3 for small output is connected. The internal operation mode is changed (details will be described later).
また本実施形態の電源装置１０は、アーク溶接の中でもプラズマアーク溶接に用いられる仕様となっており、パイロットアーク生成回路ＰＡを備えている。パイロットアーク生成回路ＰＡは、溶接トーチＴＨ１〜ＴＨ３において本アークの前にパイロットアークを生じさせるものであり、インバータ回路１２と同様に制御回路２０により制御される。 Moreover, the power supply device 10 of this embodiment is a specification used for plasma arc welding among arc welding, and includes a pilot arc generation circuit PA. The pilot arc generation circuit PA generates a pilot arc before the main arc in the welding torches TH1 to TH3, and is controlled by the control circuit 20 in the same manner as the inverter circuit 12.
制御回路２０は、アーク溶接を良好に行うべくその時々の出力電力を適正値とするための出力制御として、インバータ回路１２のスイッチング素子ＴＲ１〜ＴＲ４に対してスイッチング制御を実施する。本実施形態の制御回路２０は、スイッチング制御としてパルス幅変調制御（ＰＷＭ制御）と位相シフト制御（ＰＳＭ制御）との両制御が可能であり、制御の切り替えを行うようになっている（制御切替部２０ａ）。 The control circuit 20 performs switching control on the switching elements TR <b> 1 to TR <b> 4 of the inverter circuit 12 as output control for setting the output power at that time to an appropriate value in order to perform arc welding satisfactorily. The control circuit 20 of this embodiment can perform both control of pulse width modulation control (PWM control) and phase shift control (PSM control) as switching control, and performs control switching (control switching). Part 20a).
制御回路２０のスイッチング制御について、インバータ回路１２のスイッチング素子ＴＲ１，ＴＲ４を組とし、スイッチング素子ＴＲ２，ＴＲ３を組として、各組を交互にオンオフ動作させる。例えば数百［Ａ］の大電流から数［Ａ］の極小電流までの出力電流を出力可能な電源装置１０である場合、図２に示すように、出力大時から出力小時、即ち数百［Ａ］から数十［Ａ］の電流域ではＰＷＭ制御が選択され、出力極小時、即ち数［Ａ］の極小電流域ではＰＳＭ制御が選択される。 Regarding the switching control of the control circuit 20, the switching elements TR1 and TR4 of the inverter circuit 12 are set as a set, and the switching elements TR2 and TR3 are set as a set, and each set is alternately turned on and off. For example, in the case of the power supply device 10 capable of outputting an output current from a large current of several hundred [A] to a minimal current of several [A], as shown in FIG. PWM control is selected in the current range from A] to several tens [A], and PSM control is selected in the minimum output range, that is, in the minimum current range of several [A].
ＰＷＭ制御は、スイッチング素子ＴＲ１〜ＴＲ４のオンパルス幅を可変とする制御であるが、出力大時では、溶接トランスＩＮＴ側に大きな電力伝達を行うためにスイッチング素子ＴＲ１〜ＴＲ４のオンパルス幅が幅広のパルス幅Ｗｘに設定される。また、出力を小さくするのに伴い、溶接トランスＩＮＴ側への電力伝達を小さくするためにスイッチング素子ＴＲ１〜ＴＲ４のオンパルス幅が次第に幅狭に設定される。オンパルス幅が極めて幅狭になると、スイッチング素子ＴＲ１〜ＴＲ４のオンへの切り替わりが不安定となって溶接トランスＩＮＴが偏磁へと進む虞があるのを懸念して、十分オン可能な最小のパルス幅Ｗ０に設定される出力小時がＰＷＭ制御を下限とし、それよりも小さい出力を行う出力極小時ではＰＳＭ制御とする。 The PWM control is a control that makes the on-pulse width of the switching elements TR1 to TR4 variable. However, when the output is large, the on-pulse width of the switching elements TR1 to TR4 is wide in order to transmit large power to the welding transformer INT side. The width Wx is set. As the output is reduced, the on-pulse widths of the switching elements TR1 to TR4 are gradually set to be narrower in order to reduce the power transmission to the welding transformer INT side. When the on-pulse width becomes very narrow, the switching of the switching elements TR1 to TR4 becomes unstable and the welding transformer INT may move to the demagnetization. When the output is set to the width W0, the PWM control is set as the lower limit, and when the output is minimum when the output is smaller than that, the PSM control is set.
ＰＳＭ制御は、組をなすスイッチング素子ＴＲ１，ＴＲ４間、及びスイッチング素子ＴＲ２，ＴＲ３間のオンパルスの位相を可変とする制御である。つまり、出力小時よりも小さい出力を行う出力極小時では、ＰＷＭ制御の臨界時であるその出力小時のオンパルス幅をパルス幅Ｗ０で固定した状態で、同組のスイッチング素子ＴＲ１，ＴＲ４間、及びスイッチング素子ＴＲ２，ＴＲ３間のオンパルスが位相α分ずらされる。この位相α（位相差）が大きいほど溶接トランスＩＮＴ側への電力伝達が一層小さくなり、出力極小を達成しつつもスイッチング素子ＴＲ１〜ＴＲ４のオン動作の安定化が図られる。 The PSM control is a control in which the phase of the on-pulse between the switching elements TR1 and TR4 and the switching elements TR2 and TR3 forming a pair is variable. In other words, at the time of the output minimum when the output is smaller than when the output is small, the on-pulse width at the time when the output is small, which is the critical time of the PWM control, is fixed at the pulse width W0, and the switching elements TR1 and TR4 between the same set The on-pulse between the elements TR2 and TR3 is shifted by the phase α. The larger the phase α (phase difference), the smaller the power transmission to the welding transformer INT side, and the on operation of the switching elements TR1 to TR4 can be stabilized while achieving the minimum output.
従って、制御回路２０内部で次に設定すべきオンパルス幅の算出が行われた際、制御切替部２０ａは、その算出幅とＰＷＭ−ＰＳＭ制御の臨界時点のパルス幅Ｗ０との比較を行い、算出幅がパルス幅Ｗ０よりも大であればＰＷＭ制御を選択する。そして、制御回路２０は、その算出幅をそのままオンパルス幅としたＰＷＭ制御を実施する。一方、算出幅がパルス幅Ｗ０よりも小となった場合、制御切替部２０ａはＰＷＭ制御からＰＳＭ制御に切り替える。そして、制御回路２０は、その算出幅ではなくパルス幅Ｗ０をオンパルス幅とし、同組のスイッチング素子ＴＲ１，ＴＲ４間、及びスイッチング素子ＴＲ２，ＴＲ３間のオンパルスの位相αを算出値に応じて調整するＰＳＭ制御を実施する。 Therefore, when the on-pulse width to be set next is calculated in the control circuit 20, the control switching unit 20a compares the calculated width with the pulse width W0 at the critical point of the PWM-PSM control to calculate If the width is larger than the pulse width W0, the PWM control is selected. Then, the control circuit 20 performs PWM control using the calculated width as it is as the on-pulse width. On the other hand, when the calculated width becomes smaller than the pulse width W0, the control switching unit 20a switches from PWM control to PSM control. Then, the control circuit 20 uses not the calculated width but the pulse width W0 as the on-pulse width, and adjusts the phase α of the on-pulse between the switching elements TR1 and TR4 and between the switching elements TR2 and TR3 according to the calculated value. Perform PSM control.
また、インバータ回路１２のスイッチング制御（スイッチング素子ＴＲ１〜ＴＲ４のオンパルス幅の設定）を含む制御回路２０の各種制御においては、出力電流値を把握する必要がある。 Further, in various controls of the control circuit 20 including switching control of the inverter circuit 12 (setting of on-pulse widths of the switching elements TR1 to TR4), it is necessary to grasp an output current value.
ここで、電源装置１０の内部では、マイナス側出力端子に接続されるマイナス側電源線に出力電流が流れることから、このマイナス側電源線上に電流センサが設置、本実施形態では第１及び第２電流センサＩＤ１，ＩＤ２の２つの電流センサが設置されている。第１電流センサＩＤ１は、マイナス側電源線上に並列に設けた第１，第２電路の第１電路側に選択スイッチＳＷ１と共に設置され、第２電流センサＩＤ２は、第２電路側に選択スイッチＳＷ２と共に設置されている。因みに、第１及び第２電流センサＩＤ１，ＩＤ２は、例えばホール素子を用いるホール式電流センサであり、選択スイッチＳＷ１，ＳＷ２はＩＧＢＴ等の半導体スイッチである。 Here, since an output current flows through the negative power supply line connected to the negative output terminal inside the power supply apparatus 10, a current sensor is installed on the negative power supply line. In the present embodiment, the first and second current sensors are provided. Two current sensors ID1 and ID2 are installed. The first current sensor ID1 is installed together with the selection switch SW1 on the first electric circuit side of the first and second electric circuits provided in parallel on the negative power line, and the second current sensor ID2 is selected on the second electric circuit side. It is installed with. Incidentally, the first and second current sensors ID1, ID2 are, for example, Hall current sensors using Hall elements, and the selection switches SW1, SW2 are semiconductor switches such as IGBTs.
第１電流センサＩＤ１は、大電流から小電流域に合わせた広い電流域の検出が可能で分解能の粗い仕様の電流センサにて構成され、第２電流センサＩＤ２は、極小電流域に合わせた狭い電流域の検出が可能で分解能の細かい仕様の電流センサにて構成されている。例えば、出力電流２００［Ａ］仕様の電源装置１０である場合、第１電流センサＩＤ１には３００［Ａ］仕様の電流センサが、第２電流センサＩＤ２には３０［Ａ］仕様の電流センサが用いられるというように、仕様の異なる２つの電流センサＩＤ１，ＩＤ２が設置されている。第１及び第２電流センサＩＤ１，ＩＤ２は、制御回路２０（センサ切替部２０ｂ）の制御に基づく選択スイッチＳＷ１，ＳＷ２の相補の切り替え動作により、何れか一方がマイナス側電源線に接続されてその時々の出力電流の検出を行い、その検出信号を制御回路２０に出力する。 The first current sensor ID1 is configured with a current sensor having a coarse resolution specification capable of detecting a wide current range from a large current to a small current range, and the second current sensor ID2 is narrow according to a minimum current range. It consists of a current sensor that can detect the current range and has a fine resolution. For example, in the case of the power supply device 10 having an output current of 200 [A], a current sensor of 300 [A] is specified for the first current sensor ID1, and a current sensor of 30 [A] is specified for the second current sensor ID2. As used, two current sensors ID1 and ID2 having different specifications are installed. One of the first and second current sensors ID1 and ID2 is connected to the negative power supply line by the complementary switching operation of the selection switches SW1 and SW2 based on the control of the control circuit 20 (sensor switching unit 20b). The output current is detected from time to time, and the detection signal is output to the control circuit 20.
そして、本実施形態の制御回路２０は、大出力用の溶接トーチＴＨ１、中出力用の溶接トーチＴＨ２、小出力用の溶接トーチＴＨ３の何れの仕様のトーチが用いられるかで、第１及び第２電流センサＩＤ１，ＩＤ２の何れを選択するかを決定すると共に、ＰＷＭ制御とＰＳＭ制御の何れか若しくは両方の制御を用いるかを決定するようになっている。例えば、大出力用の溶接トーチＴＨ１は出力電流２００［Ａ］仕様、中出力用の溶接トーチＴＨ２は出力電流１００［Ａ］仕様、小出力用の溶接トーチＴＨ３は出力電流１５［Ａ］仕様であり、各仕様が電気的に読取可能な情報（複数端子の電位の組み合わせ等）が溶接トーチＴＨ１〜ＴＨ３に備えられる。制御回路２０は、溶接トーチＴＨ１〜ＴＨ３に装着可能なコネクタＣＯＮを介して仕様毎の情報を読み取り、各仕様に応じて制御切替部２０ａ及びセンサ切替部２０ｂにて動作態様を変更する。 The control circuit 20 according to the present embodiment determines whether the torch having the specifications of the high-power welding torch TH1, the medium-power welding torch TH2, or the small-power welding torch TH3 is used. In addition to determining which of the two current sensors ID1 and ID2 is to be selected, it is determined whether to use either or both of PWM control and PSM control. For example, the welding torch TH1 for large output has an output current 200 [A] specification, the welding torch TH2 for medium output has an output current 100 [A] specification, and the welding torch TH3 for small output has an output current 15 [A] specification. In addition, information (such as a combination of potentials of a plurality of terminals) that allows each specification to be read electrically is provided in the welding torches TH1 to TH3. The control circuit 20 reads information for each specification via the connector CON that can be attached to the welding torches TH1 to TH3, and changes the operation mode in the control switching unit 20a and the sensor switching unit 20b according to each specification.
大出力用の溶接トーチＴＨ１が電源装置１０に接続されて溶接が行われる場合、大電流から小電流域の内で比較的大きい出力電流が生じ得るため、センサ切替部２０ｂはこの電流域に適した第１電流センサＩＤ１による電流検出を行わせるべく選択スイッチＳＷ１をオン（閉路）、選択スイッチＳＷ２をオフ（開路）する。制御切替部２０ａは、スイッチング制御にこの出力向けのＰＷＭ制御を選択する。 When welding is performed with the high-power welding torch TH1 connected to the power supply device 10, a relatively large output current can be generated from a large current to a small current region. Therefore, the sensor switching unit 20b is suitable for this current region. Further, the selection switch SW1 is turned on (closed) and the selection switch SW2 is turned off (opened) in order to perform current detection by the first current sensor ID1. The control switching unit 20a selects the PWM control for this output for switching control.
中出力用の溶接トーチＴＨ２が電源装置１０に接続されて溶接が行われる場合、大電流から小電流域の内で中程度の出力電流が生じ得るため、センサ切替部２０ｂはこの場合についても第１電流センサＩＤ１による電流検出を行わせるべく選択スイッチＳＷ１をオン、選択スイッチＳＷ２をオフする。制御切替部２０ａは、この出力向けとしてＰＷＭ制御とＰＳＭ制御とをその時々の状況に応じて切り替えるハイブリッド制御とする。 When the welding torch TH2 for medium output is connected to the power supply device 10 and welding is performed, an intermediate output current can be generated in a large current range to a small current range. 1 The selection switch SW1 is turned on and the selection switch SW2 is turned off so as to perform current detection by the current sensor ID1. The control switching unit 20a is a hybrid control that switches between PWM control and PSM control according to the situation at that time for the output.
小出力用の溶接トーチＴＨ３が電源装置１０に接続され溶接が行われる場合、極小電流域の出力電流が生じ得るため、センサ切替部２０ｂはこの電流域に適した第２電流センサＩＤ２による電流検出を行わせるべく選択スイッチＳＷ１をオフ、選択スイッチＳＷ２をオンに切り替える。制御切替部２０ａは、スイッチング制御にこの出力向けとしてＰＳＭ制御を選択する。 When the welding torch TH3 for small output is connected to the power supply device 10 and welding is performed, an output current in the extremely small current region may be generated. Therefore, the sensor switching unit 20b detects the current by the second current sensor ID2 suitable for this current region. The selector switch SW1 is turned off and the selector switch SW2 is turned on. The control switching unit 20a selects PSM control for this output for switching control.
次に、電源装置１０の動作（作用）を説明する。
電源装置１０に大出力用、中出力用、小出力用の溶接トーチＴＨ１〜ＴＨ３の何れかが接続されると、制御回路２０は何れの溶接トーチＴＨ１〜ＴＨ３が接続されたかを認識する。つまり、制御回路２０は、溶接トーチＴＨ１〜ＴＨ３を介して電源装置１０の出力態様を決定し、制御切替部２０ａ及びセンサ切替部２０ｂにて動作態様を変更する。
Next, the operation (action) of the power supply device 10 will be described.
When any of the large output, medium output, and small output welding torches TH1 to TH3 is connected to the power supply device 10, the control circuit 20 recognizes which welding torches TH1 to TH3 are connected. That is, the control circuit 20 determines the output mode of the power supply device 10 via the welding torches TH1 to TH3, and changes the operation mode at the control switching unit 20a and the sensor switching unit 20b.
［大出力用の溶接トーチＴＨ１による溶接］
大出力用の溶接トーチＴＨ１が接続されると、センサ切替部２０ｂは第１電流センサＩＤ１による電流検出を選択、制御切替部２０ａはインバータ回路１２のスイッチング制御としてＰＷＭ制御を選択する。
[Welding with welding torch TH1 for high output]
When the high-power welding torch TH1 is connected, the sensor switching unit 20b selects the current detection by the first current sensor ID1, and the control switching unit 20a selects the PWM control as the switching control of the inverter circuit 12.
アーク溶接を行うべく溶接トーチＴＨ１に備えられるトーチスイッチＴＳがオンされると、制御回路２０は、パイロットアーク生成回路ＰＡの動作によるパイロットアーク点弧後に、本アーク点弧のための出力電力を生成するＰＷＭ制御を開始する。その際、制御回路２０は、第１電流センサＩＤ１の検出に基づく出力電流値と電流設定器ＩＲによる設定電流値とに基づいて、ＰＷＭ制御とした場合のスイッチング素子ＴＲ１〜ＴＲ４のオンパルス幅の算出を行う。検出した出力電流値と設定電流値との差が大きいほど出力要求が大として、出力増大を図るべくオンパルス幅の算出値は大きくなる。このＰＷＭ制御時においては、オンパルス幅の算出値がそのままスイッチング素子ＴＲ１〜ＴＲ４をオンさせる実オンパルス幅に設定される。このように大出力用の溶接トーチＴＨ１による溶接では、この出力向きの第１電流センサＩＤ１及びＰＷＭ制御が用いられ、この出力に適切な出力制御が行われる。 When the torch switch TS provided in the welding torch TH1 is turned on to perform arc welding, the control circuit 20 generates output power for the main arc ignition after the pilot arc ignition by the operation of the pilot arc generation circuit PA. PWM control is started. At that time, the control circuit 20 calculates the on-pulse width of the switching elements TR1 to TR4 in the case of PWM control based on the output current value based on the detection of the first current sensor ID1 and the set current value by the current setting device IR. I do. The greater the difference between the detected output current value and the set current value, the greater the output request, and the calculated value of the on-pulse width increases to increase the output. During this PWM control, the calculated value of the on-pulse width is set to the actual on-pulse width that turns on the switching elements TR1 to TR4. As described above, in welding by the high-power welding torch TH1, the first current sensor ID1 and the PWM control in the output direction are used, and output control appropriate to this output is performed.
［中出力用の溶接トーチＴＨ２による溶接］
中出力用の溶接トーチＴＨ２が接続されると、センサ切替部２０ｂは第１電流センサＩＤ１による電流検出を選択、制御切替部２０ａはインバータ回路１２のスイッチング制御としてＰＷＭ制御とＰＳＭ制御のハイブリッド制御を選択する。
[Welding with medium output welding torch TH2]
When the medium output welding torch TH2 is connected, the sensor switching unit 20b selects current detection by the first current sensor ID1, and the control switching unit 20a performs PWM control and PSM control hybrid control as switching control of the inverter circuit 12. select.
溶接トーチＴＨ２に備えられるトーチスイッチＴＳがオンされると、制御回路２０は、パイロットアーク点弧後に本アーク点弧のための出力電力を生成するスイッチング制御を開始する。その際、制御回路２０は、出力電流値と設定電流値とに基づいてスイッチング素子ＴＲ１〜ＴＲ４のオンパルス幅の算出を行う。オンパルス幅の算出値がパルス幅Ｗｘからパルス幅Ｗ０の間であれば、制御切替部２０ａはＰＷＭ制御を選択、オンパルス幅の算出値がパルス幅Ｗ０より小さくなると、制御切替部２０ａはＰＳＭ制御に切り替える。ＰＳＭ制御においては、オンパルス幅がパルス幅Ｗ０に固定されると共にオンパルス幅の算出値に基づいて算出される位相αにて、同組で動作するスイッチング素子ＴＲ１，ＴＲ４（ＴＲ２，ＴＲ３）のオンパルスに位相差が設定される。このように中出力用の溶接トーチＴＨ２による溶接では、この出力向きの第１電流センサＩＤ１及びＰＷＭ制御−ＰＳＭ制御のハイブリッド制御が用いられ、この出力に適切な出力制御が行われる。 When the torch switch TS provided in the welding torch TH2 is turned on, the control circuit 20 starts switching control for generating output power for the main arc ignition after the pilot arc ignition. At that time, the control circuit 20 calculates the on-pulse width of the switching elements TR1 to TR4 based on the output current value and the set current value. If the calculated value of the on-pulse width is between the pulse width Wx and the pulse width W0, the control switching unit 20a selects the PWM control. When the calculated value of the on-pulse width becomes smaller than the pulse width W0, the control switching unit 20a performs the PSM control. Switch. In the PSM control, the on-pulse width is fixed to the pulse width W0, and the on-pulses of the switching elements TR1, TR4 (TR2, TR3) operating in the same set are calculated at the phase α calculated based on the calculated value of the on-pulse width. The phase difference is set. In this way, in the welding with the medium output welding torch TH2, the hybrid control of the first current sensor ID1 and the PWM control-PSM control in this output direction is used, and output control appropriate to this output is performed.
［小出力用の溶接トーチＴＨ３による溶接］
小出力用の溶接トーチＴＨ３が接続されると、センサ切替部２０ｂは第２電流センサＩＤ２による電流検出を選択、制御切替部２０ａはインバータ回路１２のスイッチング制御としてＰＳＭ制御を選択する。
[Welding with small output welding torch TH3]
When the small output welding torch TH3 is connected, the sensor switching unit 20b selects the current detection by the second current sensor ID2, and the control switching unit 20a selects the PSM control as the switching control of the inverter circuit 12.
溶接トーチＴＨ３に備えられるトーチスイッチＴＳがオンされると、制御回路２０は、パイロットアーク点弧後に本アーク点弧のための出力電力を生成するＰＳＭ制御を開始する。その際、制御回路２０は、出力電流値と設定電流値とに基づいてスイッチング素子ＴＲ１〜ＴＲ４のオンパルス幅の算出を行い、このＰＳＭ制御ではオンパルス幅の算出値に基づいて位相α（位相差）の算出を行う。このＰＳＭ制御においては、オンパルス幅がパルス幅Ｗ０に固定されると共に、同組のオンパルスに位相αの位相差が設定される。このように小出力用の溶接トーチＴＨ３による溶接では、第２電流センサＩＤ２及びＰＳＭ制御が用いられ、この出力に適切な出力制御が行われる。 When the torch switch TS provided in the welding torch TH3 is turned on, the control circuit 20 starts PSM control for generating output power for the main arc ignition after the pilot arc ignition. At that time, the control circuit 20 calculates the on-pulse width of the switching elements TR1 to TR4 based on the output current value and the set current value. In this PSM control, the phase α (phase difference) is calculated based on the calculated value of the on-pulse width. Is calculated. In this PSM control, the on-pulse width is fixed to the pulse width W0, and the phase difference of the phase α is set in the same set of on-pulses. As described above, in the welding by the welding torch TH3 for small output, the second current sensor ID2 and the PSM control are used, and output control appropriate to this output is performed.
このように本実施形態では、電源装置１０が扱う大電流から極小電流までの広い電流域の中で、溶接トーチＴＨ１〜ＴＨ３の何れを用いるかで出力仕様が決められ、各出力仕様に適した電流センサＩＤ１，ＩＤ２に切り替えることで、出力電流の全域で適切な電流検出が可能となり、この電流検出に基づく出力制御（スイッチング制御）は全域で適切な制御となる。また各出力仕様に応じて、高出力向きのＰＷＭ制御か、低出力向きのＰＳＭ制御か、中間出力向きとしてＰＷＭ制御−ＰＳＭ制御のハイブリッド制御かが切り替えられるため、適切な出力制御が行われることの相乗的効果が得られるものとなっている。結果として、アーク溶接に品質向上が図られる。 As described above, in this embodiment, the output specification is determined depending on which of the welding torches TH1 to TH3 is used in a wide current range from a large current to a very small current handled by the power supply device 10, and is suitable for each output specification. By switching to the current sensors ID1 and ID2, appropriate current detection is possible over the entire output current, and output control (switching control) based on this current detection is appropriate control over the entire area. Also, depending on each output specification, PWM control for high output direction, PSM control for low output direction, or hybrid control of PWM control-PSM control for intermediate output direction can be switched, so appropriate output control is performed. This is a synergistic effect. As a result, quality improvement is achieved in arc welding.
次に、本実施形態の特徴的な効果を記載する。
（１）溶接トーチＴＨ１〜ＴＨ３の内で出力仕様が大きいものを用いると、検出可能な電流域が広く分解能の粗い仕様の第１電流センサＩＤ１が選択され、溶接トーチＴＨ１〜ＴＨ３の内で出力仕様が小さいものを用いると、検出可能な電流域が狭く分解能の細かい仕様の第２電流センサＩＤ２が選択されて、各電流センサＩＤ１，ＩＤ２にて検出した出力電流値に基づく出力制御（インバータ回路１２のスイッチング制御）が行われる。つまり、広い電流域を扱う本実施形態の電源装置１０では、溶接トーチＴＨ１〜ＴＨ３の出力仕様、即ち溶接トーチＴＨ１〜ＴＨ３で扱う各電流域に適した電流センサＩＤ１，ＩＤ２が選択されることで各電流域の出力電流値を適切に検出でき、各電流域毎で適切な出力制御を行うことができる。
Next, characteristic effects of the present embodiment will be described.
(1) When a large output specification is used among the welding torches TH1 to TH3, the first current sensor ID1 having a wide detectable current range and a coarse resolution is selected, and the output is output within the welding torches TH1 to TH3. If a small specification is used, the second current sensor ID2 having a narrow detectable current range and a fine resolution is selected, and output control based on the output current value detected by each of the current sensors ID1 and ID2 (inverter circuit) 12 switching control) is performed. That is, in the power supply device 10 of the present embodiment that handles a wide current range, the output specifications of the welding torches TH1 to TH3, that is, the current sensors ID1 and ID2 that are suitable for each current range handled by the welding torches TH1 to TH3 are selected. The output current value in each current region can be detected appropriately, and appropriate output control can be performed for each current region.
（２）インバータ回路１２のスイッチング制御において、出力要求の大きい期間ではＰＷＭ制御が実施され、出力要求が小さい期間になるとＰＳＭ制御に切り替えられる。つまり、出力要求の小さい期間でＰＷＭ制御を実施したとするとインバータ回路１２のスイッチング素子ＴＲ１〜ＴＲ４が十分にオンできない虞があるが、これに代わってＰＳＭ制御を用いることでスイッチング素子ＴＲ１〜ＴＲ４のオンパルス幅を十分オン可能な所定幅（幅Ｗ０）としつつも出力を下げることが可能である。これにより、ＰＷＭ制御とＰＳＭ制御とを切り替えることで広い電流域での適切な出力制御が可能で、電流センサＩＤ１，ＩＤ２を切り替える構成との組み合わせによる相乗的効果が期待できる。 (2) In the switching control of the inverter circuit 12, the PWM control is performed during a period when the output request is large, and is switched to PSM control when the output request is small. In other words, if the PWM control is performed in a period when the output request is small, the switching elements TR1 to TR4 of the inverter circuit 12 may not be sufficiently turned on, but instead of this, the switching elements TR1 to TR4 are controlled by using the PSM control. The output can be lowered while the on-pulse width is set to a predetermined width (width W0) that can be sufficiently turned on. Accordingly, appropriate output control in a wide current range is possible by switching between PWM control and PSM control, and a synergistic effect can be expected by a combination with a configuration in which the current sensors ID1 and ID2 are switched.
（３）電流センサＩＤ１，ＩＤ２の切り替えやスイッチング制御の切り替えを行うことで、１つの電源装置１０であっても複数の出力仕様の電源装置として使用することができる。 (3) By switching the current sensors ID1 and ID2 and switching control, even one power supply device 10 can be used as a power supply device having a plurality of output specifications.
（４）電源装置１０と溶接トーチＴＨ１〜ＴＨ３とをコネクタＣＯＮを通じて電気的に接続することで、センサ切替部２０ｂ及び制御切替部２０ａは溶接トーチＴＨ１〜ＴＨ３の出力仕様を自動判別し、この判別に応じた切り替え動作を行う。これにより、溶接トーチＴＨ１〜ＴＨ３の出力仕様の判別を簡易で確実とすることができる。 (4) By electrically connecting the power supply device 10 and the welding torches TH1 to TH3 through the connector CON, the sensor switching unit 20b and the control switching unit 20a automatically determine the output specifications of the welding torches TH1 to TH3. The switching operation according to is performed. Thereby, it is possible to easily and reliably determine the output specifications of the welding torches TH1 to TH3.
（５）電流センサＩＤ１，ＩＤ２を切り替える回路は、並列接続した電流センサＩＤ１，ＩＤ２毎の電路を選択スイッチＳＷ１，ＳＷ２にて選択的に接続するかで切り替えを行う構成である。つまり、各電路上には各電流センサＩＤ１，ＩＤ２の耐性に合った電流が流れるため、電流センサＩＤ１，ＩＤ２の保護等の効果が期待できる。 (5) The circuit for switching the current sensors ID1 and ID2 is configured to perform switching depending on whether the electric circuits for the current sensors ID1 and ID2 connected in parallel are selectively connected by the selection switches SW1 and SW2. In other words, since currents that match the resistances of the current sensors ID1 and ID2 flow on the electric circuits, effects such as protection of the current sensors ID1 and ID2 can be expected.
尚、上記実施形態は、以下のように変更してもよい。
・マイナス側電源線上に並列に設けた第１，第２電路に電流センサＩＤ１，ＩＤ２をそれぞれ１つずつ設置し、選択スイッチＳＷ１，ＳＷ２にて電路を切り替えて電流センサＩＤ１，ＩＤ２を選択する構成としたが、これに限らず適宜変更してもよい。
In addition, you may change the said embodiment as follows.
A configuration in which one current sensor ID1, ID2 is installed in each of the first and second electric circuits provided in parallel on the negative power line, and the current sensors ID1, ID2 are selected by switching the electric circuit with the selection switches SW1, SW2. However, the present invention is not limited to this, and may be changed as appropriate.
例えば図３に示すように、マイナス側電源線上に２つの電流センサＩＤ１，ＩＤ２を並べて設置し、制御回路２０への検出信号の入力を選択スイッチＳＷ１，ＳＷ２にて選択する構成としてもよい。またこの場合、制御回路２０の内部で電流センサＩＤ１，ＩＤ２からの検出信号の入力を選択できれば、選択スイッチＳＷ１，ＳＷ２を省略することもできる。 For example, as shown in FIG. 3, two current sensors ID1 and ID2 may be arranged side by side on the negative power supply line, and the input of the detection signal to the control circuit 20 may be selected by the selection switches SW1 and SW2. In this case, if the detection signal input from the current sensors ID1 and ID2 can be selected in the control circuit 20, the selection switches SW1 and SW2 can be omitted.
・電流センサＩＤ１，ＩＤ２の切り替えを動作途中で変更させてもよい。
・仕様の異なる２つの電流センサＩＤ１，ＩＤ２を切り替える態様であったが、仕様の異なる３以上の電流センサを切り替える態様としてもよい。
-Switching between the current sensors ID1 and ID2 may be changed during the operation.
-Although it was the aspect which switches two current sensor ID1, ID2 from which a specification differs, it is good also as an aspect which switches the 3 or more current sensors from which a specification differs.
・仕様の異なる３つの溶接トーチＴＨ１〜ＴＨ３を用いて切り替える態様であったが、２つ若しくは４以上の溶接トーチを用いる態様としてもよい。
・電源装置１０と溶接トーチＴＨ１〜ＴＨ３とをコネクタＣＯＮを通じて電気的に接続して溶接トーチＴＨ１〜ＴＨ３の出力仕様を自動判別したが、出力仕様を切り替えるスイッチや出力仕様の数値入力を行う手段を溶接トーチや電源装置に設けて、作業者にて切り替える態様としてもよい。
-Although it was the aspect switched using three welding torches TH1-TH3 from which a specification differs, it is good also as an aspect using two or four or more welding torches.
The power supply device 10 and the welding torches TH1 to TH3 are electrically connected through the connector CON to automatically determine the output specifications of the welding torches TH1 to TH3. A switch for switching the output specifications and means for inputting the numerical values of the output specifications are provided. It is good also as an aspect which provides in a welding torch and a power supply device, and switches by an operator.
・ＰＷＭ−ＰＳＭ制御の切り替えを動作途中で変更しない態様としてもよい。
・ＰＷＭ制御とＰＳＭ制御の両制御を用いる態様であったが、ＰＷＭ制御のみの出力制御、ＰＳＭ制御のみの出力制御等、１つのスイッチング制御を行うものであってもよい。
-It is good also as an aspect which does not change switching of PWM-PSM control in the middle of operation | movement.
-Although it was the aspect using both control of PWM control and PSM control, you may perform one switching control, such as output control only of PWM control, and output control only of PSM control.
・上記実施形態の電源装置１０はプラズマアーク溶接用を想定しているが、その他の溶接用の電源装置に適用してもよい。この場合、パイロットアーク生成回路ＰＡを省略する等、回路構成を適宜変更する。 -Although the power supply device 10 of the said embodiment assumes the object for plasma arc welding, you may apply to the power supply device for other welding. In this case, the circuit configuration is changed as appropriate, such as omitting the pilot arc generation circuit PA.
１０ 溶接用電源装置
１１ 一次側変換回路（電力生成回路）
１２ インバータ回路（電力生成回路）
１３ 二次側変換回路（電力生成回路）
ＩＮＴ 溶接トランス（電力生成回路）
２０ 制御回路
２０ａ 制御切替部（制御切替手段、判別手段）
２０ｂ センサ切替部（センサ切替手段、判別手段）
ＳＷ１，ＳＷ２ 選択スイッチ（センサ切替手段）
ＩＤ１，ＩＤ２ 電流センサ
ＴＲ１〜ＴＲ４ スイッチング素子
ＴＨ１〜ＴＨ３ 溶接トーチ
Ｍ 溶接対象
ＣＯＮ コネクタ（判別手段）
10 Power supply device for welding 11 Primary side conversion circuit (power generation circuit)
12 Inverter circuit (power generation circuit)
13 Secondary conversion circuit (power generation circuit)
INT welding transformer (power generation circuit)
20 control circuit 20a control switching unit (control switching means, discrimination means)
20b Sensor switching unit (sensor switching means, discrimination means)
SW1, SW2 selection switch (sensor switching means)
ID1, ID2 Current sensor TR1-TR4 Switching element TH1-TH3 Welding torch M Welding object CON connector (discriminating means)
Claims (4)
前記電流センサには、検出可能な電流域と分解能とを含む仕様の異なるものが複数用いられ、
出力仕様の異なる複数の前記溶接トーチの内で出力仕様が大きい程、検出可能な電流域が広く分解能の粗い仕様の電流センサにて前記出力電流値の検出が行われ、前記溶接トーチの内で出力仕様が小さい程、検出可能な電流域が狭く分解能の細かい仕様の電流センサにて前記出力電流値の検出が行われるように、前記溶接トーチの出力仕様に対応して複数の電流センサの内の何れかを選択的に切り替えるセンサ切替手段と、
溶接用電源装置と前記溶接トーチとの電気的接続に基づいて前記溶接トーチの出力仕様が自動判別される判別手段とを備えたことを特徴とする溶接用電源装置。 A power generation circuit that generates output power, a current sensor that detects an output current value, and a control circuit that performs output control to control the power generation circuit based on the detected output current value to obtain desired output power A welding power supply device for supplying the output power to a welding torch to perform welding of a welding target,
The current sensor is used in a plurality of different specifications including a detectable current range and resolution,
The larger the output specification among the plurality of welding torches with different output specifications, the more the current range that can be detected is detected by a current sensor with a rough resolution, and the output current value is detected within the welding torch. The smaller the output specification, the narrower the current range that can be detected, and the detection of the output current value by the current sensor with the detailed resolution. a sensor switching means for selectively switching one of,
What is claimed is: 1. A welding power source device comprising: a discriminating means for automatically discriminating an output specification of the welding torch based on an electrical connection between the welding power source device and the welding torch .
前記電力生成回路は、スイッチング素子のオンオフ動作により直流電力から高周波交流電力への電力変換を行うインバータ回路を含んで構成され、
前記制御回路は、出力要求が大となる期間では前記インバータ回路のスイッチング素子のオンパルス幅を可変とするパルス幅変調制御を選択し、出力要求が小となる期間では同組で動作するスイッチング素子のオンパルス幅を所定幅に固定しつつ同組のオンパルスに位相差を生じさせる位相シフト制御に切り替える制御切替手段を備え、前記溶接トーチの出力仕様に応じたスイッチング制御を実施することを特徴とする溶接用電源装置。 In the welding power supply device according to claim 1,
The power generation circuit includes an inverter circuit that performs power conversion from DC power to high-frequency AC power by an on / off operation of a switching element,
The control circuit selects pulse width modulation control that makes the on-pulse width of the switching element of the inverter circuit variable during a period when the output request is large, and the switching circuit that operates in the same group during a period when the output request is small. Welding characterized by comprising control switching means for switching to phase shift control that causes a phase difference in the same set of onpulses while fixing the onpulse width to a predetermined width, and performing switching control according to the output specifications of the welding torch Power supply.
前記センサ切替手段は、複数の前記電流センサ毎の電路を並列接続し、何れの電路を選択的に接続するかで前記電流センサを切り替える回路を含んで構成されたことを特徴とする溶接用電源装置。 In the welding power supply device according to claim 1 or 2 ,
The sensor switching means includes a circuit for switching the current sensors according to which one of the plurality of current sensors is connected in parallel, and which one of the current paths is selectively connected. apparatus.
プラズマアーク溶接用の出力電力を生成するように構成されたことを特徴とする溶接用電源装置。 In the welding power supply device according to any one of claims 1 to 3 ,
A welding power supply device configured to generate output power for plasma arc welding.
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