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:
Apr. 18, 2000
Filed:
Oct. 17, 1997
Benno Doemen, St. Georgen, DE;
Papst-Motoren GmbH & Co. KG, , DE;
Abstract
Drive circuit for a brushless, electronically commutated DC motor, wherein an electronic switching element (T.sub.1, T.sub.2) is arranged in series with each phase winding (L.sub.1, L.sub.2) of the motor and the switching elements (T.sub.1, T.sub.2) are driven in response to a sensor (2) for the rotational position of the rotor, in particular formed as a digital Hall IC, wherein each phase winding (L.sub.1, L.sub.2) is connected to a common node (8) of the circuit via a respective decoupling diode (D.sub.1, D.sub.2), and wherein parallel to the phase windings (L.sub.1, L.sub.2) and the corresponding decoupling diodes (D.sub.1, D.sub.2) a protective transistor circuit (10) is arranged that is driven in such a manner that the inductively induced voltage peaks are eliminated.