PURPOSE: To facilitate to adjust output voltage, by arranging a plurality number of cores in the thickness direction, providing clearance and piling them, and providing control windings whose a part cores can be excited.
CONSTITUTION: Core block which is composed of E type core 8 and I type core 9, core block which is composed of E type core 11 that control winding is wound and I type core 12 are piled and arranged in the thickness direction, providing clearance, and input winding 15, resonance winding 16, and rsonance condenser 17 are provided. When high frequency voltage is impressed in the input winding 15, iron resonance phenomena is generated in the winding 16 and the condenser 17, and output terminal 18 is stabilized. Furthermore, when direct current is currented in the control winding 14, core leg which arranges the windings 14 is excited, magnetic flux which passes through the core leg that arranges the windings 14 is decreased, and the sectional area is reduced, then, output voltage is lowered. Therefore, when the gratitude of direct current which is currented in the windings 14 is varied, the sectional area of the core leg which arranges the resonance winding 16 can be equivalently varied, and output voltage can be varied.
KADOTA TOKUZOU
SAEKI TAIICHI
