Integrated magnetic inductor having series and common mode windi

Details Integrated magnetic inductor having series and common mode windi Integrated magnetic inductor having series and common mode windi

1990-08-21

1994-06-07

Lee, Benny

Inductor devices

Winding formed of plural coils

Wound to reduce external magnetic field

333181, 336184, H01F 2728

Patent

active

053193431

ABSTRACT:
An integrated magnetic filter inductor having series and common mode windings includes a magnetic core (44) having a first leg (46), a second leg (48), and a third leg (50). The first leg (46) is connected to the second leg (48) with bridging structures (52) and (54). In a similar manner, the third leg (50) is connected to the second leg (48) with bridging structures (56) and (58). A common mode winding (64) is wound about the bridging structure (52) with a given dot orientation. A common mode winding (66) is wound about the other bridging structure (54) with the same dot polarity. Current flowing into the dot terminal of the common mode winding (64) and out of the dot terminal of the common mode winding (66) result in a net zero magnetic flux induced in the magnetic structure (44). A common mode winding (68) is wound about the bridging structure (56) with a predetermined dot polarity. A common mode winding (70) is wound about the other bridging structure (58) with the same dot polarity. Therefore, when current flows into the dot end of one of the windings (68) and (70) and out of the dot end of the other winding, the net flux induced in the magnetic structure (44) is zero. A primary winding (62) is wound about the second leg and induces a flux into the magnetic structure (44).

REFERENCES:
patent: 1553983 (1925-09-01), Casper
patent: 3231841 (1966-01-01), Ohtake
patent: 3629741 (1971-12-01), Brune
patent: 3631534 (1971-12-01), Hirota et al.
patent: 3683271 (1972-08-01), Kobayashi
patent: 3753189 (1973-08-01), Allen
patent: 3778759 (1973-12-01), Carroll
patent: 4581573 (1986-04-01), Dobsa et al.
patent: 5023585 (1991-06-01), Kurano et al.
patent: 5083101 (1992-01-01), Frederick
"MU-Derived Communications Filter", Research Disclosure, Oct. 1986, p. 611.

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