The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 2006
Filed:
Nov. 26, 2003
Alexander Hahn, Saludorf-Boll, DE;
Hermann Rappenecker, Vöhrenbach, DE;
Harald Schmid, Emmingen, DE;
Alexander Hahn, Saludorf-Boll, DE;
Hermann Rappenecker, Vöhrenbach, DE;
Harald Schmid, Emmingen, DE;
ebm-papst St. Georgen GmbH & Co. KG, St. Georgen, DE;
Abstract
An electronically commutated motor () is adapted to be powered directly by an AC voltage (U) source, and comprises a permanent-magnet rotor (), a stator having at least one winding phase (L, L, . . . , Ln), a rectifier () which generates, from the AC voltage (U), a pulsating DC voltage (U) between a positive lead () and a negative lead () of a DC link (). Also present is a bridge circuit (A,B,C), connected to that DC link () and provided to supply current to the at least one winding phase (L, L, . . . , Ln), which comprises a switching element () controllable with a control voltage (U) that is lower than the pulsating DC voltage (U) to be switched. An auxiliary circuit (') generates, from the pulsating DC voltage (U) at the DC link and from the AC voltage (U), a control voltage (U) for driving the switching element () that is lower than the pulsating DC voltage by an amount equal to a predetermined value (U). A preferred filter () for connection to an AC power grid is described. A preferred embodiment of the circuit includes a bridge circuit having a p-channel MOSFET () at the positive lead () and an n-channel MOSFET () at the negative lead () of the DC link ().