Patent ID: 7504808

Claim:
A multiphase DC-DC converter including a multiphase transformer configured in a mixed cyclic cascade topology, comprising: a first coupled inductor pair having a first terminal coupled to a first transformer input terminal, the first coupled inductor pair having a second terminal coupled to a second transformer input terminal; a second coupled inductor pair having a first terminal coupled to a third transformer input terminal, the second inductor pair having a second terminal coupled to a fourth transformer input terminal; a third coupled inductor pair having a first terminal coupled to a fifth transformer input terminal; a fourth coupled inductor pair having a first terminal, a second terminal, a third terminal, and a fourth terminal; and a fifth coupled inductor pair having a first terminal, a second terminal, a third terminal, and a fourth terminal, wherein the first coupled inductor pair further comprises a third terminal and a fourth terminal, wherein the second coupled inductor pair further comprises a third terminal and a fourth terminal, wherein the third coupled inductor pair further comprises a second terminal, a third terminal and a fourth terminal, wherein the third terminal of the first coupled inductor pair is coupled to the second terminal of the fourth coupled inductor pair, wherein the fourth terminal of the first coupled inductor pair is coupled to the second terminal of the third coupled inductor pair, wherein the first terminal of the fourth coupled inductor pair is coupled to the fourth terminal of the second coupled inductor pair, wherein the third terminal of the third coupled inductor pair is coupled to the second terminal of the fifth coupled inductor pair, wherein the third terminal of the second coupled inductor pair is coupled to the first terminal of the fifth coupled inductor pair, and wherein the third terminal of the fourth coupled inductor pair is coupled to the third terminal of the fifth coupled inductor pair, to the fourth terminal of the fifth coupled inductor pair, to the fourth terminal of the third coupled inductor pair, to the fourth terminal of the fourth coupled inductor pair, and to a transformer output terminal.