Power amplifier for feeding an inductance with switched transist

Details Power amplifier for feeding an inductance with switched transist Power amplifier for feeding an inductance with switched transist

1991-02-27

1992-05-12

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including class d amplifier

330 66, 330289, 330207A, 363132, 363 98, H03F 3217

Patent

active

051131455

ABSTRACT:
Switched transistors (T1 . . . through T4 . . .) are arranged in a bridge circuit such that a plurality of transistors (T1 . . . through T4 . . .) are connected in parallel in every bridge branch. These transistors are secured on a thermally and electrically conductive ring (R, R'), are symmetrically distributed over this ring (R1, R1'), and have a respective terminal electrically connected thereto. The connection to further terminals of the transistors (T1 . . . through T4 . . .) occurs essentially in rotationally-symmetrical fashion via large-area printed circuit boards (LE1 through LE6). Short connecting paths with low values of inductance are achieved with this arrangement. Furthermore, the waste heat from all transistors (T1 . . . through T4 . . .) is uniformly carried off via the rings (R1, R1'), so that all transistors (T1 . . . through T4 . . .) work at the same temperature. A uniform current division onto all transistors (T1 . . . through T4 . . .) connected in parallel is assured with this arrangement, even in a dynamic case.

REFERENCES:
patent: 4020361 (1977-04-01), Suelzle et al.
patent: 4566059 (1986-01-01), Gallios et al.
patent: 4616305 (1986-10-01), Damiano et al.
patent: 4626980 (1986-12-01), McGuire
patent: 4860189 (1989-08-01), Hitchcock
patent: 4864479 (1989-09-01), Steigerwald et al.
patent: 4884186 (1989-11-01), Small
patent: 4901216 (1990-02-01), Small
patent: 4914399 (1990-04-01), Doany
patent: 4935857 (1990-06-01), Nguyen et al.
patent: 4967336 (1990-10-01), Davies et al.
Brad Hall--"Parallelschaltung von Leistungs"--MOSFET Funk-Technik 41 (1986), pp. 465-467.

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