发明名称 |
Power supply for electric arc welding |
摘要 |
A power supply connectable to a source of AC line voltage for AC electric arc welding by an AC arc current across a welding gap between an electrode and a workpiece, the power supply comprises a high capacity transformer that converts said line voltage to an AC output voltage, and a rectifier that converts the AC output voltage to a DC voltage between a positive terminal and a common terminal at generally zero volts and a negative terminal and the common terminal. The power supply has a first switch that connects the positive terminal to the common terminal across the gap when a gate signal is applied to the first switch, a second switch for connecting the negative terminal to the common terminal across the gap when a gate signal is applied to the second switch and a pulse width modulator operated for generating pulses at a frequency of at least about 18 kHz. A logic network has a first circuit for directing the pulses to the first switch for a first time, a second circuit for directing the pulses to the second switch for a second time and a controller to alternately operate first and second circuits to create AC arc welding current.
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申请公布号 |
US2004021451(A1) |
申请公布日期 |
2004.02.05 |
申请号 |
US20030628125 |
申请日期 |
2003.07.28 |
申请人 |
LINCOLN GLOBAL, INC., A DELAWARE CORPORATION |
发明人 |
STAVA ELLIOTT K. |
分类号 |
B23K9/073;B23K9/09;B23K9/10;H02M5/458;H02M9/00;(IPC1-7):H02M5/42 |
主分类号 |
B23K9/073 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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