Planar magnetic structure
First Claim
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1. A planar magnetic structure comprisinga printed wiring board having at least one winding segment;
- an inner clearance through said printed wiring board within said winding segment;
at least one outer clearance through said printed wiring board external to said winding segment;
a core having an inner leg extending through said inner clearance and at least one outer leg extending through said outer clearance defining a gap occupied by said winding segment;
an inner shield between said inner clearance and said inner core leg, said inner shield surrounding said inner leg but being less than one turn defining a shield gap;
said shields reducing the voltage gradient between said core legs and said winding segment; and
at least one outer electrostatic shield between said outer clearance and said at least one core outer leg, said outer shield disposed between said outer leg and inner leg; and
a guard barrier proximate said shield gap and between said shield gap and said winding segments;
said guard barrier reducing the voltage gradient between said inner shield end at said gap and said winding segment.
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Abstract
An improved planar magnetic structure in which the voltage gradient between core and windings is reduced by shields disposed between the one or more legs of the core and the windings and extending through the PWB layers; vias are offset to permit them to be contained within the path of the winding; and the induced magnetic and eddy currents intrinsic to interstitial shield layers are reduced by configuring the shield conductors with pairs of courses with opposite and offsetting current propagation.
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Citations
25 Claims
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1. A planar magnetic structure comprising
a printed wiring board having at least one winding segment; -
an inner clearance through said printed wiring board within said winding segment; at least one outer clearance through said printed wiring board external to said winding segment; a core having an inner leg extending through said inner clearance and at least one outer leg extending through said outer clearance defining a gap occupied by said winding segment; an inner shield between said inner clearance and said inner core leg, said inner shield surrounding said inner leg but being less than one turn defining a shield gap;
said shields reducing the voltage gradient between said core legs and said winding segment; andat least one outer electrostatic shield between said outer clearance and said at least one core outer leg, said outer shield disposed between said outer leg and inner leg; and a guard barrier proximate said shield gap and between said shield gap and said winding segments;
said guard barrier reducing the voltage gradient between said inner shield end at said gap and said winding segment. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A planar magnetic structure comprising:
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a printed wiring board having a plurality of layers; a core having a central leg and at least one external leg spaced from said central leg and extending through said layers of said printed wiring board; a winding segment on each layer, each winding segment having a generally spiral path about said central leg between said central leg and said one or more external legs;
said winding segments being connected together from layer to layer;a plurality of vias extending through said layers within the boundaries of said generally spiral path; each of said winding segments except the last winding segment having its output connected to the input of the next winding segment through a via which is within the boundaries of said generally spiral path and the vias unconnected at any particular winding segment passing through that winding segment without electrical contact; and at least one interstitial shield layer; a shield on the shield layer including a serpentine conductor made of a series of courses, each pair of courses in said serpentine conductor propagating current in opposite directions for offsetting the induced magnetic fields and resulting currents. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An electrostatic shield for a multilayer electronic device comprising:
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a first set of conductors including at least two spaced courses; a second set of conductors including at least two spaced courses interdigitated with said first set of conductors;
each of said conductors includes a barrier section which separates the courses of the other set of conductors and is connected to a fixed potential. - View Dependent Claims (22, 23, 24, 25)
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Specification