| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method for a direct-current converter, by which stable output supply, an EMC noise reduction and a protective operation can be performed by controlling the semiconductor switching element of each converter in terms of a problem that occurs when a direct-current converter with a two-step structure is actually applied as a converter.SOLUTION: A direct-current converter is configured such that an insulation type resonance converter 14 comprises: a transformer 9 having a primary coil and a secondary coil; a resonance capacitor 7 and a resonance reactor 8, which are connected to the primary side of the transformer 9; a second switching element 5 and a third switching element 6, connected in series, which controls power supplied to the resonance capacitor 7 and resonance reactor 8; and rectifying circuits 10, 11, which are connected to the secondary side of the transformer 9. In a control step, the second and third switching elements 5, 6 are alternately on/off controlled at a fixed on-duty ratio, with a dead time being interposed between them.SELECTED DRAWING: Figure 1 |
