Integrated transformer
AssigneeSTMicroelectronics S.r.l.
InventorsVincenzo Palumbo, Gabriella Ghidini, Enzo Carollo, Fabrizio Fausto Renzo Toia
Life of this patent
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Abstract
An integrated transformer includes a primary winding and a secondary winding each having a spiral planar arrangement coils. A dielectric portion of dielectric material is interposed between the primary winding and the secondary winding. A field plate winding is electrically coupled with the primary winding. The field plate winding includes at least one field plate coil having a first lateral extension greater than a second lateral extension of a primary outer coil of the primary winding. The field plate coil is superimposed in plan view to the primary outer coil of the primary winding.
Claims17
An integrated transformer, comprising:
- a primary winding;
- a secondary winding;
- wherein each of the primary and secondary windings is made of a metallic material and has a spiral planar arrangement comprising a corresponding plurality of coils;
- a dielectric portion made of dielectric material interposed between the primary winding and the secondary winding;
- and
- a field plate winding electrically coupled with the primary winding, the field plate winding comprising at least one field plate coil having a lateral extension greater than a lateral extension of a primary outer coil of the primary winding with the at least one field plate coil overlapping in plan view the primary outer coil of the primary winding, the field plate winding being configured to mutually separate equipotential surfaces of an operating electric field at an edge of the primary outer coil of the primary winding that faces the secondary winding.
An integrated transformer, comprising:
- a primary metal winding with multiple coils in a spiral arrangement and including an outermost coil;
- a secondary metal winding with multiple coils in a spiral arrangement and including an outermost coil;
- a field plate metal winding with multiple coils in a spiral arrangement and including an outermost coil;
- and
- a dielectric material including a first dielectric portion interposed between the primary metal winding and the secondary metal winding and a second dielectric portion interposed between the primary metal winding and the field plate metal winding;
- wherein an outer lateral edge of the outermost coil of the field plate metal winding extends beyond an outer lateral edge of the outermost coil of the primary metal winding by a lateral extension distance d;
- and
- wherein d is greater than a distance ti by which the second dielectric portion separates the field plate metal winding from the primary metal winding.
Dependencies are inferred from the claim text.