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US 2016/0111197 A1Published application
Embedded magnetic component transformer device
AssigneeMurata Manufacturing Co., Ltd.
InventorQuinn KNELLER
Life of this patent
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Abstract
A transformer device includes primary, secondary, and auxiliary windings, located in an insulating substrate by conductive vias joined together by conductive traces. Positions of the conductive vias are arranged so as to optimize the isolation properties of the transformer, and to improve the coupling of the transformer by increasing the leakage inductance and reducing the distributed capacitance. The transformer device is compact and is weakly coupled. The weak coupling between the windings reduces the likelihood of the transformer malfunctioning, particularly when used in a self-resonant converter circuit.
Claims17
An embedded transformer device, comprising:
- an insulating substrate including a first side and a second side opposite the first side, and including a cavity therein, the cavity including an inner and an outer periphery;
- a magnetic core housed in the cavity;
- a primary winding extending through the insulating substrate and around a first side of the magnetic core;
- a secondary winding extending through the insulating substrate and around a second side of the magnetic core;
- and
- an auxiliary winding extending through the insulating substrate and around the first side of the magnetic core so as not to overlap with the primary winding;
- wherein
- each of the primary, secondary, and auxiliary windings includes:
- upper conductive traces;
- lower conductive traces;
- inner conductive connectors extending through the insulating substrate adjacent an inner periphery of the magnetic core, the inner conductive connectors respectively define electrical connections between respective upper conductive traces and respective lower conductive traces;
- and
- outer conductive connectors extending through the insulating substrate adjacent an outer periphery of the magnetic core, the outer conductive connectors respectively define electrical connections between respective upper conductive traces and respective lower conductive traces;
- the primary winding is spaced from the auxiliary winding so that electrical isolation is provided by a gap between the primary and auxiliary windings;
- a conductive element is provided in the gap between the primary and auxiliary windings and on a same layer of the insulating substrate as the upper or lower conductive traces.
12 more elements
An embedded transformer device, comprising:
- an insulating substrate including a first side and a second side opposite the first side, and including a cavity therein, the cavity including an inner and an outer periphery;
- a magnetic core housed in the cavity;
- a primary winding extending through the insulating substrate and around a first side of the magnetic core;
- a secondary winding extending through the insulating substrate and around a second side of the magnetic core;
- and
- an auxiliary winding extending through the insulating substrate and around the first side of the magnetic core so as not to overlap with the primary winding in a thickness direction of the insulating substrate;
- wherein
- each of the primary, secondary, and auxiliary windings includes:
- upper conductive traces;
- lower conductive traces;
- inner conductive connectors extending through the insulating substrate adjacent an inner periphery of the magnetic core, the inner conductive connectors respectively define electrical connections between respective upper conductive traces and respective lower conductive traces;
- and
- outer conductive connectors extending through the insulating substrate adjacent an outer periphery of the magnetic core, the outer conductive connectors respectively define electrical connections between respective upper conductive traces and respective lower conductive traces;
- the primary winding is spaced from the auxiliary winding so that electrical isolation is provided by a gap between the primary and secondary windings;
- and
- a conductive element is provided in the gap between the primary and secondary windings.
13 more elements
An embedded transformer device, comprising:
- an insulating substrate including a first side and a second side opposite the first side, and including a cavity therein, the cavity including an inner and an outer periphery;
- a magnetic core housed in the cavity;
- a primary winding extending through the insulating substrate and around a first side of the magnetic core;
- a secondary winding extending through the insulating substrate and around a second side of the magnetic core;
- and
- an auxiliary winding extending through the insulating substrate and around the first side of the magnetic core so as not to overlap with the primary winding;
- wherein
- each of the primary, secondary, and auxiliary windings includes:
- upper conductive traces;
- lower conductive traces;
- inner conductive connectors extending through the insulating substrate adjacent an inner periphery of the magnetic core, the inner conductive connectors respectively define electrical connections between respective upper conductive traces and respective lower conductive traces;
- and
- outer conductive connectors extending through the insulating substrate adjacent an outer periphery of the magnetic core, the outer conductive connectors respectively define electrical connections between respective upper conductive traces and respective lower conductive traces;
- either:
- the upper conductive traces of the primary winding are on the same layer of the insulating substrate as the upper conductive traces of the auxiliary winding;
- or
- the lower conductive traces of the primary winding are on the same layer of the insulating substrate as the lower conductive traces of the auxiliary winding;
- the primary winding is spaced from the auxiliary winding so that electrical isolation is provided by a gap between the primary and secondary windings;
- and
- a conductive element is provided in the gap between the primary and secondary windings.
17 more elements
Dependencies are inferred from the claim text.