发明授权
- 专利标题: Power supply apparatus for resistance welder including means for preventing polarized transformer excitation
- 专利标题(中): 电阻焊机用电源装置,包括防止极化变压器励磁的装置
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申请号: US42067申请日: 1979-05-24
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公开(公告)号: US4306138A公开(公告)日: 1981-12-15
- 发明人: Norikazu Tokunaga , Hisao Amano , Yorito Jifuku
- 申请人: Norikazu Tokunaga , Hisao Amano , Yorito Jifuku
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX53-63260 19780529; JPX53-63261 19780529
- 主分类号: B23K11/25
- IPC分类号: B23K11/25 ; B23K11/24
摘要:
A power supply apparatus for a resistance welder has an inverse-parallel thyristor circuit for constrolling the welding current. One of thyristors connected in inverse-parallel relationship is turned on by a first signal whose reference phase is established by a synchronizing signal which is based on a voltage wave form of an AC power source and the other thyristor is turned on by a second signal whose reference phase is established by a signal which is delayed half a period of the voltage wave form with respect to the first signal, so that integrals of positive and negative halves of the output voltage wave form of the inverse parallel thyristor circuit can always be made equal.
公开/授权文献
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