| 摘要 |
PROBLEM TO BE SOLVED: To easily enable a voltage resonance type switching converter to be compatible with a wide range only by controlling a switching frequency, and to achieve improvement in reliability of a power circuit by improvement in performance of component elements, cost reduction, and downsizing and lightness in weight of the circuit. SOLUTION: A secondary side parallel resonance circuit is provided at the voltage resonance type converter to form a state of loose coupling in which a coupling coefficient (k) of an insulated converter transformer PIT is equal to about 0.7 or less, by which a control range of the switching frequency required for stabilization is reduced while constant-voltage control characteristics have steep single-peak characteristics. Moreover, a primary-side parallel resonance frequency fo1 and a secondary-side parallel resonance frequency fo2 are set so that excellent characteristics of power conversion efficiency may be obtained. In addition, an active clamp circuit 10 is included to suppress a peak of a resonance voltage pulse, then a breakdown voltage of a switching element or the like is reduced. COPYRIGHT: (C)2006,JPO&NCIPI
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