Inductor devices – Core surrounding linear conductor
Reexamination Certificate
1997-01-06
2001-08-28
Mai, Anh (Department: 2832)
Inductor devices
Core surrounding linear conductor
C336S174000, C333S177000
Reexamination Certificate
active
06281777
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to an inductive component for the attenuation of common mode and push-pull interferences in n lead systems with n≧2 leads.
The propagation ratios of lead-bound interference must be considered when dimensioning EMC filters (electromagnetic compatibility). One must also differentiate between common mode and push-pull interference.
Push-pull interference propagates only along the connected leads, whereby in a two-lead system the interference current moves along one lead in the direction of potentially susceptible equipment while moving along the other lead back toward the interference source. The two interference currents are in push-pull and therefore such interference is called push-pull or symmetrical interference.
Parasitic capacitances in the interference source and potentially susceptible equipment or intentional connections to ground also result in an interference current in the ground loop. The interference current flows along the leads to the potentially susceptible equipment and flows back through the ground leads. The interference currents on the leads are in common mode, thus such interference is called common mode interference or asymmetrical interference.
Current-compensated inductors are used to attenuate asymmetrical interference. However, those inductances are not suitable for the attenuation of symmetrical interference, since the required leakage inductance is very low (≦1% of the asymmetric components). In order to compensate for that ineffectiveness against symmetrical interference, additional inductances which are effective against symmetrical interference are employed. Examples include bar or toroidal core inductors with very low inductance due to the use of low-permeability cores. However, such solutions are relatively expensive. The power loss of such systems is also rather high.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide an inductive component for the attenuation of common mode and push-pull interference, which unifies component parts for the interference suppression of symmetrical and asymmetrical interferences in one component to be used for the interlocking of n≧2) leads, which can be inexpensively manufactured and which exhibits low intrinsic losses.
With the foregoing and other objects in view there is provided, in accordance with the invention, an inductive component for the attenuation of common mode and push-pull interferences in n-lead systems, comprising a body of a permeable material having n bores formed therein; and n≧2 electric leads disposed in the bores.
In accordance with another feature of the invention, the body is symmetrical about a center axis of the body. In accordance with a further feature of the invention, the bores are symmetrical to an axis of the body.
In accordance with an added feature of the invention, the body is formed of a highly permeable material. In accordance with an additional feature of the invention, the body is in the form of a disk.
In accordance with yet another feature of the invention, the body has at least one air gap formed therein. In accordance with yet a further feature of the invention, the at least one air gap is shunted.
In accordance with yet a further feature of the invention, there is provided a number of windings per unit length of the lead being ≧1. In accordance with yet an added feature of the invention, the individual leads have different numbers of windings per unit length.
In accordance with yet an additional feature of the invention, the body is assembled of materials with different permeabilities. In accordance with again another feature of the invention, there is provided at least one other body, the bodies being disposed one behind the other. In accordance with a concomitant feature of the invention, the bodies are formed of different materials.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in an inductive component for the attenuation of common mode and push-pull interference, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
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Aufleger Peter
Baschke Herbert
Greenberg Laurence A.
Lerner Herbert L.
Mai Anh
Siemens Matsushita Components GmbH & Co. KG
Stemer Werner H.
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