| 摘要 |
In a switching DC/DC converter using an insulating transformer Tr, a primary coil and a secondary coil of the transformer Tr, an input choke coil L 1 , and an output choke coil L 3 are wound around a common core and are formed into a single component. A primary circuit of the transformer Tr includes a switching device Q 1 connected in series with the primary coil, an input choke coil L 1 connected across the terminals of the primary coil, and a series circuit of a clamp capacitor C 1 and a switching device Q 1 ' which are connected across the terminals of the primary coil. A secondary circuit of the transformer Tr includes rectifying switching devices Q 2 and Q 2 ' connected to the secondary coil, the output choke coil L 3 , and an output smoothing capacitor C<SUB>0</SUB>. Further, a series circuit of the switching device Q 1 ' and the clamp capacitor C 1 may be connected across the terminals of the switching device Q 1 . The coils are arranged in directions of canceling DC fluxes generated by the coils, so that it is possible to greatly reduce the DC bias magnetization of the core, the volume of the core, and core losses, thereby achieving higher efficiency in the overall apparatus.
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