| 摘要 |
<p>PURPOSE:To reduce high-frequency ripples without using an inductance regulating coil by providing a ferrite core displaceable in the axial direction of a step-up coil in the step-up coil. CONSTITUTION:A stepping motor 36 is forward or reversely driven to rotate an insulation drive shaft 32 via a bevel gear 35. As the shaft 32 is rotated, a ferrite core 38 disposed between a secondary U-phase coil 42 and a secondary V-phase coil 42' is displaced in the axial direction of a step-up coil by a threaded part 321 of the shaft 32 and a screw mechanism of a jack 40 engaged with the part 321, thereby relatively regulating the induction coupling degree of the primary coil with the secondary U-phase coil and the secondary V-phase coil, and the position of the core 38 is so regulated that the high-frequency induced ripple to be superposed on the DC output voltage is minimized. Thus, a coil for regulating the inductance is eliminated.</p> |
