Alpha and Omega Semiconductor (cayman) Ltd.

Lih-Ming Doong

Yu-Ming Chen

Jung-Pei Cheng

Chieh-Wen Cheng

Hsiang-Chung Chang

Tsung-Han Ou

An isolation coupling structure for transmitting a feedback signal between a secondary side and a primary side of a voltage conversion device includes a first dielectric layer including a first face and a second face opposite to the first face, a first coupling coil disposed on the first face enclosing to form an inner region; a second coupling coil configured to couple with the first coupling coil. The second coupling coil includes a first coil portion and a second coil portion, where the first coil portion is disposed on the second face, the second coil portion is disposed on the first face and located inside the inner region. The second coil portion is isolated from the first coupling coil, and the first coil portion and the second coil portion are electrically connected. The technical effect is that it can realize the electrical isolation and the coupling with low cost and small package size.

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Zhunan, Taiwan

Lih-Ming Doong