System and Method for Reducing Power Losses for Magnetics Integrated in a Printed Circuit Board
a technology of printed circuit board and magnetic device, which is applied in the direction of printed circuit parts, printed circuit non-printed electric components association, inductance, etc., can solve the problems of undesired electrical signals at undesired frequencies, undesired radiated and/or conducted emissions at the output of power converter, and heat loss in choke, so as to reduce the eddy current induced within the coil due to the air gap fringing flux, the effect of reducing the power loss
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first embodiment
[0038]Turning initially to FIG. 1, a magnetic component 10 integrated into a circuit board 20 is illustrated. The PCB 20 is a multi-layer board where a coil 50 is defined by multiple loops of circuit traces on the PCB. With reference also to FIG. 2, a first opening 24 extends through the PCB 20 which is configured to receive a center portion of a core 80. A pair of side openings 29 also extend through the PCB 20 with a first side opening 29 positioned to one side of the first opening 24 and a second side opening 29 positioned on the opposite side of the first opening 24. An “E-shaped” member 84 of the core 80 may be inserted into the openings with a central portion 81 of the core 80 extending through the first opening 24 and a pair of side members 83 of the core 80 extending through the side openings 29. Although not visible in FIG. 1, a second member of the core, such as an “I-shaped” member 82 of the core 80 may be positioned on the reverse side of the PCB 20. Clips 27 extending u...
second embodiment
[0047]With reference next to FIG. 11, the magnetic component 10 varies the position of traces 52 in the PCB 20. Once again, for ease of illustration, the PCB 20 is not shown. FIG. 11 includes only sectional views of the E-shaped member 84 and I-shaped member 82 of the core 80 as well as sectional views of traces 52 on the PCB 20. However, traces 52 illustrated in the same row in FIG. 11 are on a single layer of the PCB 20. Each of the traces 52 has a uniform width and an axis 70 defined extending vertically through a midpoint of the trace 52. The traces 52 on the lowest layer have a first axis 70A, and the traces 52 on each subsequent layer extending upward through the PCB have a corresponding axis (70B-70K) defined. The axes are illustrated only in the column of inner traces 54, however, it is understood that each column of traces has a unique set of axes. The second axis 70B, defined in the trace 52 immediately above the trace having the first axis 70A, is offset from the first ax...
third embodiment
[0048]Turning then to FIG. 12, the magnetic component 10 varies both the width and the position of traces 52 in the PCB 20. Once again, for ease of illustration, the PCB 20 is not shown. FIG. 12 includes only sectional views of the E-shaped member 84 and I-shaped member 82 of the core 80 as well as sectional views of traces 52 on the PCB 20. However, traces 52 illustrated in the same row in FIG. 12 are on a single layer of the PCB 20. Each column of traces 52 includes a gradual offset of the axes between traces 52 in adjacent layers such that the trace 52 in the upper most layer of each column is offset away from the central portion 81 of the E-shaped member 84 further than the trace 52 in the lowest layer of the respective column in a manner similar to that discussed above with respect to FIG. 11. Additionally, the widths of the traces 52 are varied to reduce the cross-sectional area of traces present near the air gap 85. The widths of traces 52 in a column nearest the central port...
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