| 摘要 |
PROBLEM TO BE SOLVED: To realize a configuration coping with a wide range by reducing the required control range of switching frequency control in a power circuit for performing constant voltage control by the switching frequency control. SOLUTION: A coupled resonance circuit by the electromagnetic coupling of an insulating converter transformer PIT is formed by providing a primary series resonance circuit for forming a current resonance converter, and a secondary series resonance circuit formed at least by secondary winding N2 and a secondary series resonance capacitor C2. Then, a coupling factor k in the insulating converter transformer PIT is set to k=0.65 or smaller to obtain unimodal characteristics for the coupled resonance circuit. Therefore, a gap G in an inner magnetic leg in the insulating capacitor transformer PIT is expanded to approximately 2.8 mm. COPYRIGHT: (C)2006,JPO&NCIPI |
