| 摘要 |
<p>A ferrite core for use as a power transformer and/or as a choke coil is assembled from a pair of identical core halves (21) together with a bobbin (31) on which a coil is wound. Each of the core halves (21) has an E-shaped structure with a central portion core (23) around which a coil is wound, a pair of side legs (24) and a boase plate (22) which couples the central portion (23) with the side legs (24). The central portion (23) is oval in cross-section. The core is mounted on a printed circuit board so that the axis of the central portion (23) is parallel to the printed circuit board. This provides a transformer with a low height (H) compared with that of prior transformers which have a circular central portion. Further because of the smooth rounded edges of the central portion (23) the coil is not likely to be damaged, and the coil tightly surrounds the core, resulting the reduction of the undesirable leakage inductance of the transformer.</p> |
