| 摘要 |
PURPOSE: A method for varying a current of an AC source using a DC source and a transformer for varying the current are provided to obtain the fine current control quantity by controlling the DC source by reducing a current degradation. CONSTITUTION: An eddy current loss unit(20,40) by a core and a coil is formed in one power line of the AC source line provided from a power transformer. An eddy current prevention unit(30) is formed in a side of the eddy current loss unit. If the current is lost in the eddy current loss unit by applying the AC source, the eddy current phenomenon is disturbed by applying the DC source to the eddy current prevention unit. The current quantity of the AC source passing through the eddy current loss unit is increased by applying the DC source.
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