| 摘要 |
The invention relates to a method for minimizing the harmonic loading of a single-phase alternating voltage current source from a welding current source (10) comprising a first rectifier circuit (14), a passive power factor correction circuit (16), a clocked bridge circuit (26), a resonant converter (38) and a second rectifier circuit (52), wherein the resonant converter (38) comprises a transformer (40) and a resonant circuit having a first capacitance (44) and a first inductance (42). In order for the harmonic loading to be kept low with a welding current source that is cost-effective to manufacture, it is proposed that a second capacitance (48) and/or a second inductance be connected in parallel to the transformer (40) or the magnetizing inductance of the transformer (40) is used as the second inductance, wherein the ratio of the first capacitance (44) to the second capacitance (48) when the second capacitance (48) is arranged on the primary side corresponds to a value from the range of 1 to 10 and when the second capacitance (48) is arranged on the secondary side corresponds to the quotient of a value from the range of 1 to 10 and the square of the transformation ratio of the transformer (40), and wherein the ratio of the second inductance to the first inductance (42) when the second inductance is arranged on the primary side corresponds to a value from the range of 0.5 to 10 and when the second inductance is arranged on the secondary side corresponds to the quotient of a value from the range of 0.5 to 10 and the square of the transformation ratio of the transformer (40). Further proposed is a welding current source (10) for carrying out the method. |
