Inductor devices – With mounting or supporting means
Patent
1989-07-19
1990-09-11
Kozma, Thomas J.
Inductor devices
With mounting or supporting means
336200, 336232, H01F 1502, H01F 2730
Patent
active
049566270
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention proceeds from a high-frequency transformer having at least one annular core supported on elastic carrier sheets. There is known from the German Patent Application P 28 58 369.9 a flat coil, in which the sum of the insulation spacings between the turns and the widths of the conductor tracks is adjusted to the dimensions of the components to be connected in parallel or in series to the coil. The insulation spacing between the turns increases from the inside outwards at least in partial areas, so that the parasitic winding capacitances are reduced. The advantage provided by this measure is that the limiting frequency of the coil is increased. With the known flat coil, there is a limit to the maximum coil inductance which can be achieved at high frequency.
There is known from the German Offenlegungsschrift 3,322,004 an inductive component which has a coil mounted on an insulating carrier in the form of printed conductor tracks, and a closed ferrite core. Accordingly, it is possible to realize repeating coils with this arrangement. The insulating carrier consists of an elastic material, which springs back into its position in the plane after being deformed. Provided in the insulating carrier are openings for accepting the ferrite core, and inserting slots for the core, which end in these openings. Together with the section bounded by two neighbouring supports, the strip passing through the ferrite core forms an elastic tongue, which can be removed from the plane of the insulating carrier in order to introduce the core into the openings, and springs back into position in the plane after being released under the effect of its intrinsic elasticity, the tongue strip centring and retaining the ferrite core in the openings. With this inductive component, too, there is a limit to the inductance magnitude at high frequency. Certainly, it is possible in principle to increase the inductance by raising the number of turns, but then it is necessary to put up with an undesirable increase in the leakage inductance, because with a rise in the number of turns there is likewise an increase in the distance from the core of the conductor tracks arranged in a plane.
Advantages of the Invention
The high-frequency transformer according to the invention has the advantage that for the same requirement in areas as before it is possible at high frequency to realize coils of high quality having almost arbitrary inductance magnitudes. Conductor tracks are arranged on at least two flexible, mutually insulated carriers lying one above another. In common with the carriers, the electrical conductors are approximately cut open, and reconnected by means of one or more intervening bridges, which have corresponding conducting track parts, so that closed turns are produced. The conducting pieces arranged on the additional insulating carriers are bonded to the conductor tracks arranged on the carriers with a soldering joint or by means of thermocompression as for multilayer circuits. In the course of the conductor tracks, or at the conductor track ends, bonding pads for surface mounted devices are constructed on the underside of the undermost carrier, or on the undermost bridge and/or on the upperside of the uppermost carrier, or on the uppermost bridge.
It is an advantage that after being inserted into the openings in the carrier the magnetic core employed is captively connected to the latter, there being no need for special, additional measures and preparations to secure the location of the core in the openings. Accordingly, it is excluded that the cores can fall out during transport from the assembly station to a further station, for example a soldering station.
In a form of the high-frequency component according to the invention the sum of the insulation spacings between the turns and the widths of the conductor tracks is adjusted to the dimensions of the SMDs. With this form of coil it is possible to employ predetermined, easily obtainable SMDs, and to adjust the form of the coils thereto. Consequently, there is no
REFERENCES:
patent: 4253231 (1981-03-01), Nouet
Pfizenmaier Heinz
Schmidt Ewald
Kozma Thomas J.
Robert & Bosch GmbH
Striker Michael J.
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