ELECTRIC POWER UNIT AND ELECTRIC POWER UNIT FOR WELDING

PROBLEM TO BE SOLVED: To provide an electric power unit (power unit for welding) capable of obtaining stable output even in low-output adjustment.SOLUTION: First and second switch TR1 and TR2 connected in series as a switch of a chopper circuit 11 are brought under pulse-width modulation control (PW...

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1. Verfasser:	GAMO ISAMU
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an electric power unit (power unit for welding) capable of obtaining stable output even in low-output adjustment.SOLUTION: First and second switch TR1 and TR2 connected in series as a switch of a chopper circuit 11 are brought under pulse-width modulation control (PWM control) at a high-output request to adjust output by adjusting an on-pulse width of a control pulse signal on the side of the second switch TR2 between control pulse signals output to the first and second switches TR1 and TR2. At a low-output request, on the other hand, the control is switched to phase shift control (PSM control) to adjust the output by adjusting a phase difference between the control pulse signals output to the first and second switches TR1 and TR2.SELECTED DRAWING: Figure 1 【課題】低出力調整時においても安定した出力を得ることができる電源装置（溶接用電源装置）を提供する。【解決手段】チョッパ回路１１のスイッチとして直列接続される第１及び第２スイッチＴＲ１，ＴＲ２に対し、高出力要求時には、第１及び第２スイッチＴＲ１，ＴＲ２に出力する制御パルス信号の第２スイッチＴＲ２側のオンパルス幅の調整により出力調整を行うパルス幅変調制御（ＰＷＭ制御）が行われる。これに対し、低出力要求時には、第１及び第２スイッチＴＲ１，ＴＲ２に出力する制御パルス信号の相互の位相差の調整により出力調整を行う位相シフト制御（ＰＳＭ制御）に制御が切り替わる。【選択図】図１