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:
Jul. 09, 1991
Filed:
Jan. 04, 1990
Heikki Tuusa, Tampere, FI;
Kone Elevator GmbH, Baar, CH;
Abstract
In a procedure for the selection of a bridge or bridge section in a rectifier bridge unit having a bridge or bridge section conducting in one direction and another bridge or bridge section conducting in the other direction, said bridges or bridge sections having solid-state switches, selection of the bridge or bridge section is based on the direction of the actual value of the current when the actual current has an essentially non-zero value, on the reference value of the current when the actual current value is essentially zero and the reference value of the current is essentially other than zero, or, when both the actual and reference values of the current are essentially zero, on a signal controlling the selection of the bridge or bridge section during the zero-current condition, which signal directs the bridge control signals alternatively to either bridge or bridge section. A bridge selector unit includes circuits for implementing this procedure.