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The principle of using hollow spiral winding is not novel, but the study on this topic is far from complete. In this paper, how hollow the central region of the coreless printed spiral winding (CPSW) inductor should be for a given footprint area in order to achieve the maximal quality factor Q and to maintain high inductance value is explored. A hollow factor based on the ratio of the inner...
In this paper, a novel silicon-embedded coreless transformer (SECT) is proposed and demonstrated for isolated dc-dc converter applications. By embedding two interleaved thick Cu coils in the bottom layer of the Si substrate, the designed 2 mm2 SECT can achieve a maximum transformer efficiency of 85% at 50 MHz. Compared to the on-silicon coreless power transformer reported earlier for 0.5 W isolated...
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