Miniature Transformers Adapted for use in Galvanic Isolators and the Like
First Claim
1. An apparatus comprising:
- a substrate comprising an insulating layer of material having top and bottom surfaces, said top surface comprising a first trace having an outer end and an inner end and a first spiral conductor connected between said outer and inner ends of said first trace and comprising a continuous and gradually widening linear conductor that forms a curve around a central region; and
said bottom surface comprising a second trace having an outer end and an inner end and a second spiral conductor connected between said outer and inner ends of said second trace and comprising a continuous and gradually widening linear conductor that forms a curve around a central region, said central regions of said first and second spiral conductors overlying one another;
a conductor connecting said inner ends of said first and second traces;
a first contact connected to said outer end of said first trace; and
a second contact connected to said outer end of said second trace,said first and second spiral conductors being oriented such that a current traveling from said outer end of said first trace to said inner end of said first trace generates a magnetic field having a first component perpendicular to said top surface in said central region of said first trace, and a current passing from said inner end of said second trace to said outer end of said second trace generates a magnetic field having a second component perpendicular to said top surface in said central region of said second trace, said first component having a direction that is the same as said second component.
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Accused Products
Abstract
A component coil for constructing transformers and the transformer constructed therefrom are disclosed. The component coil includes a substrate having an insulating layer of material having top and bottom surfaces. First and second traces are included on the top and bottom surfaces. Each trace includes a spiral conductor. The inner ends of the spiral conductors are connected by a conductor that passes through the insulating layer. The first and second spiral conductors are oriented such that magnetic fields generated by the first and second spiral conductors have components perpendicular to the top surface and in the same direction. The component coils can be used to construct a power transformer or a galvanic isolator.
121 Citations
19 Claims
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1. An apparatus comprising:
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a substrate comprising an insulating layer of material having top and bottom surfaces, said top surface comprising a first trace having an outer end and an inner end and a first spiral conductor connected between said outer and inner ends of said first trace and comprising a continuous and gradually widening linear conductor that forms a curve around a central region; and said bottom surface comprising a second trace having an outer end and an inner end and a second spiral conductor connected between said outer and inner ends of said second trace and comprising a continuous and gradually widening linear conductor that forms a curve around a central region, said central regions of said first and second spiral conductors overlying one another; a conductor connecting said inner ends of said first and second traces; a first contact connected to said outer end of said first trace; and
a second contact connected to said outer end of said second trace,said first and second spiral conductors being oriented such that a current traveling from said outer end of said first trace to said inner end of said first trace generates a magnetic field having a first component perpendicular to said top surface in said central region of said first trace, and a current passing from said inner end of said second trace to said outer end of said second trace generates a magnetic field having a second component perpendicular to said top surface in said central region of said second trace, said first component having a direction that is the same as said second component.
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2. An apparatus comprising:
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a primary winding; a secondary winding, wherein one of said primary and secondary windings comprises a first component coil; and an insulator separating said primary and secondary windings, said primary and secondary windings being aligned such that a portion of the magnetic field generated by said first component coil passes through the other of said primary and secondary windings when a potential difference is applied between the power pads of said first component coil. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of fabricating a transformer, said method comprising:
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providing a first sheet of component coils, the substrate of each component coil in said first sheet being part of a first insulating layer that is shared by all of said component coils in said first sheet; providing a second sheet of component coils, the substrate of each component coil in said second sheet being part of an insulating layer that is shared by all of said component coils in said second sheet, said first and second sheets of component coils being bonded to an insulating sheet such that each component coil in said first sheet overlies a corresponding component coil in said second sheet; and cutting said bonded first and second sheets to provide individual power transformers comprising first and second component coils that overlie one another. - View Dependent Claims (19)
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Specification