| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wire-wound transformer adapted to an optional primary resonance frequency by increasing a resonance frequency of the wire-wound transformer for a high voltage output without decreasing the number of secondary windings. <P>SOLUTION: A primary resonance circuit is configured by connecting a resonance capacitor C1 to a primary winding 40 of the wire-wound transformer 44. The primary side of the 44 is connected to a control circuit for driving a plurality of switching elements, a primary resonance voltage is extracted from the primary resonance circuit to apply a primary resonance phase signal whose phase is matched with that of a primary resonance current to cause self-oscillation to the control circuit, thereby exciting the wire-wound transformer 44. An air gap 24 formed to the core 2 of the wire-wound transformer 44 corresponding to the resonance frequency of the primary resonance circuit increases the resonance frequency of the wire-wound transformer 44 itself. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
