IMPLANTABLE MEDICAL DEVICE INCLUDING A MOLDED PLANAR TRANSFORMER
First Claim
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1. A method of forming a transformer assembly, comprising:
- providing a mold chase having an upper mold chase and a lower mold chase, wherein the upper and lower mold chase define at least one cavity;
providing a substrate unit including primary and secondary windings;
disposing the substrate unit within the at least one cavity of the mold chase;
dispensing an encapsulant material into the at least one cavity of the mold chase, wherein the encapsulant material comprises a mold material that becomes fluid during the dispensing such that the mold material fills the cavity and encapsulates the substrate unit;
curing the encapsulant material to form a core having a shape defined by the upper mold chase and the lower mold chase; and
separating the mold chase from the encapsulated substrate unit.
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Abstract
The present disclosure provides methods and techniques associated with a planar transformer for an apparatus. The planar transformers include a substrate carrying electronic components and a continuous core that is formed by distributing the encapsulant material uniformly around the substrate unit to define a consistent cross-sectional area for the magnetic path. The electronic components include primary windings and secondary windings associated with the transformer. In some embodiments, the encapsulant material is molded to seals air gaps to the substrate unit.
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Citations
20 Claims
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1. A method of forming a transformer assembly, comprising:
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providing a mold chase having an upper mold chase and a lower mold chase, wherein the upper and lower mold chase define at least one cavity; providing a substrate unit including primary and secondary windings; disposing the substrate unit within the at least one cavity of the mold chase; dispensing an encapsulant material into the at least one cavity of the mold chase, wherein the encapsulant material comprises a mold material that becomes fluid during the dispensing such that the mold material fills the cavity and encapsulates the substrate unit; curing the encapsulant material to form a core having a shape defined by the upper mold chase and the lower mold chase; and separating the mold chase from the encapsulated substrate unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An implantable medical device having electronic circuitry operable to perform a therapeutic and/or monitoring function, comprising:
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a battery; a capacitor; and a transformer coupled to the battery and the capacitor, wherein the transformer includes; a substrate unit having electronic components and including primary and secondary windings embedded within the substrate unit; a core encapsulating the substrate unit, wherein the core includes a unitary core having a unitary core that are molded to eliminate an air gap therebetween.
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19. The implantable medical device, wherein the configuration of the unitary core is selected based on a performance criteria for the transformer.
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20. The implantable medical device, wherein the unitary core comprises a polymer bonded magnetic compound.
Specification