| 摘要 |
The invention relates to a method for regulating welding power supply. A bridge circuit supplies energy to a resonance converter, and is provided with a first bridge branch including a first and a second switch element, and a second bridge branch including a third and a fourth switch element. The switch element is sequentially controlled by state of switch-on or switch-off which is determined by positive operation period, a first idle rotation period, negtive operation period and a second idle rotation period, wherein the start of the operation period is predetermined by switching the first and the second switch elements, end of the operation period is predetermined by switching by switching of the third and the fourth switch elements, the switching frequency of the switching element depends on frequency of current of resonance converter in a first control mode. The invention is proposed that the switching frequency of the switching element reduces in a coefficient factor of integer in a second mode relative to the first control mode, thereby not only providing dramatically large output current but very small output current. |
