| 摘要 |
A coil module comprises a circular core and a winding is provided. The circular core comprises an outer circular portion and an inner circular portion. The winding is wound around the outer circular portion in a single-layer configuration and around the inner circular portion in a multi-layer configuration. The coil module comprises a first thickness after the winding is wound around the outer circular portion and comprises a second thickness after the winding is wound around the inner circular portion, wherein the first thickness is greater than or equal to the second thickness.
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