A circuit board including: a first board material layer having a first planar surface and a first sidewall surface perpendicular to the first planar surface; a first conductive layer on the first planar surface; a second board material layer stacked on the first board material layer and having a second planar surface and a second sidewall surface perpendicular to the second planar surface; a second conductive layer on the second planar surface; and a plating on the first sidewall surface and the second sidewall surface and electrically connecting the first conductive layer and the second conductive layer.

A winding assembly, such as a transformer or an inductor, includes a spring clip and a retaining clip for mechanically coupling the winding assembly to a printed circuit board (PCB) or a printed wiring board (PWB). The clips provide structural rigidity to the winding assembly, allowing the winding assembly to remain functional during high shock events. Further, the clips compress a thermal pad positioned beneath the winding assembly, providing sufficient heat transfer surface area for transferring heat away from the winding assembly.

A method of assembling a quasi-planar transformer can include passing a continuous wire through an opening in a printed circuit board having one or more printed circuit traces that define one or more printed circuit windings of the quasi-planar transformer, winding the continuous wire in a first direction to form a first half of a wire-wound winding on a first side of the printed circuit board, and winding the continuous wire in a second direction opposite the first to form a second half of the wire-wound winding on a second side of the printed circuit board. The method can further include securing the first and second halves of the winding to the printed circuit board. The continuous magnet wire can be self-bonding wire and securing the first and second halves of the winding can include applying heat to the assembly.

A magnetic core for use with a printed circuit board transformer can include one or more inside corners of the magnetic core formed to include a curved channel that serves as a strain relief and facilitates positioning a printed circuit board within a core window defined by the core. The magnetic core can be an E-core. A center post of the E-core can define a notch configured to receive a complementary tab of a printed circuit board of the printed circuit board transformer. A center post of the E-core can be shorter than outside legs of the E-core, so that when assembled with an I-core a resulting core has an air gap. The core can be made of a ferrite material. A printed circuit board transformer can include a printed circuit board having one or more turns of a conductive trace disposed thereon and a magnetic core as described above.

A voltage regulator module includes a circuit board, a first component and a switching circuit assembly. The circuit board includes a first surface, a second surface, a concave structure and a contact pad. The first surface and the second surface are opposed to each other. The concave structure is disposed in the circuit board and concavely formed on the second surface. The contact pad is formed on the second surface and served as at least one of a positive output terminal, a negative output terminal and a positive input terminal. The concave structure and the contact pad are misaligned to each other. The first component is at least partly disposed within the concave structure. The switching circuit assembly is disposed on the first surface and electrically connected with the contact pad and the first component.

A method for planar transformer with an odd turn ratio includes: determining a turn ratio and winding parameters of a transformer to be manufactured; if the turn ratio is odd, determining that there is respectively one winding turn on a first middle layer and a second middle layer and two winding turns on a top layer and a bottom layer; determining widths of winding wires on marginal layers as well as widths of winding wires on middle layers; winding and parallelly connecting an inner winding wire on the top layer to an inner winding wire on the bottom layer, and then serially connecting the parallel-connected inner winding wires to an outer winding wire to form a primary winding; and parallelly connecting the winding wire on the first middle layer to the winding wire on the second middle layer to form a secondary winding, so as to obtain the transformer.

The invention relates to an inductive component. The component comprises a coil core, in particular a ferrite core, and at least one coil winding. The coil core is formed by at least two core parts, or only two core parts, in particular one core part and one additional core part. The core parts form the coil core when assembled. The core parts have respective joining surfaces which are designed to face each other when the core parts are joined. According to the invention, in the inductive component of the aforementioned type, at least one of the core parts has a through-opening. The through-opening is arranged and designed to lead heat-conducting medium into a cavity, in particular a gap, extending between the joining surfaces and to fill said cavity with the heat-conducting medium.

A magnetic structure in a power converter includes at least two multilayer boards, such as a primary board containing the primary windings and some auxiliary windings, and a secondary board containing the secondary windings and some auxiliary windings. The primary and secondary boards are on top of each other. On the layer on the primary board adjacent to the secondary board, is a dual function shield to reduce the total common mode noise in the converter towards zero. The controlled dual function shield can be placed on the secondary board on the layer adjacent to the primary board, and in some embodiments can be placed on both primary and secondary board on the layers adjacent to the other board. The embodiments herein offer a very good solution for cost reduction of the planar transformers and offers an avenue for total elimination of the common mode noise in a power converter.

Variation in inductance is reduced with a secondary-side coil substrate on which a plurality of wiring layers are superimposedly disposed, and a plurality of coils provided in the secondary-side coil substrate. On the wiring layer, coil patterns corresponding to parts of one circumferences of the coils are formed. On the wiring layer, coil patterns corresponding to remaining parts of the one circumferences of the coils are formed. The coil patterns, and the coil patterns that are provided on the different wiring layers are connected to each other via conduction points in a superimposition direction of the wiring layers, and the one circumferences of the respective coils are formed.

An electronic component 100 includes: a circuit board module 104 which is composed of a plurality of layers, and in which a primary circuit 120 and secondary circuits 122, 124 are each formed using wring patterns of a first layer L1 to an eighth layer L8; and a magnetic core 106 which magnetically couples the primary circuit 120 and the secondary circuits 122, 124. The circuit board module 104 includes: a primary winding 120b and secondary windings 122b, 124b which are formed spirally around the magnetic core 106; and a third layer L3 and a sixth layer L6 interposed between a fourth layer L4 of the primary winding 120b and a second layer L2 of the secondary winding 122b and between a fifth layer L5 of the primary winding 120b and a seventh layer L7 of the secondary winding 124b.