Combined inductor shielding system
AssigneeWhirlpool Corporation
InventorFabiano Chinazzo
Life of this patent
Estimating the term…
Abstract
An inductive cooking combined shield configured to be arranged below a cooking coil winding may include a plurality of ferrite bars and a plurality of elements made of a second material alternatively arranged in a plane so that to create a complementary electromagnetic shielding that extends from the center of the coil to the perimeter and has a modular structure that allows to block and/or to mitigate undesired macro eddy currents generated by the electromagnetic flux produced by the current flowing inside the winding.
Claims14
An inductive cooking shield configured to be arranged below a cooking coil winding designed for half-bridge, full-bridge and quasi resonant topologies, comprising:
- a plurality of ferrite bars arranged at least in one plane defined by a perimeter that is configured to provide magnetic coverage;
- and
- a plurality of second elements made of a second shielding material complementary arranged to the ferrite bars that acts as a secondary shield and provides electromagnetic coverage from induced flux generated by the current circulating inside the coil winding, wherein at least one of the second shielding materials defines a recess to form limited openings open at the perimeter to receive one of the ferrite bars within the recess.
A shielded coil assembly, comprising:
- a cooking coil for an inductive cooktop;
- and
- a shield including:
- a plurality of ferrite bars arranged on a metallic plate, at least a portion of the ferrite bars extending radially outwards in a plane from a center of the shield to facilitate magnetic coverage of the coil, and
- a second material radially arranged within the plane between the plurality of ferrite bars to block undesired macro eddy current created by the coil winding, wherein the ferrite bars and the second material extend to a same perimeter such that the second material prevents the flow of macro eddy currents within sections created by the ferrite bars as well as around the ferrite bars to another section.
Dependencies are inferred from the claim text.