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:
Mar. 11, 2014
Filed:
Jul. 16, 2010
Ari Ristimäki, Laihia, FI;
Nicklas Södö, Vaasa, FI;
Matti Takala, Vaasa, FI;
Mika Levonen, Tampere, FI;
Ari Ristimäki, Laihia, FI;
Nicklas Södö, Vaasa, FI;
Matti Takala, Vaasa, FI;
Mika Levonen, Tampere, FI;
Vacon Oyj, Vaasa, FI;
Abstract
A converter includes a converter bridge () adapted to transfer electrical energy between the AC terminal () and the DC terminal () of the converter. The converter also includes electrical paths bypassing the converter bridge for conducting overvoltage transients occurring in the AC terminal around the converter bridge to the DC terminal. Each electrical path includes a unidirectionally conductive semiconductor component (), such as a diode, and a voltage-limiting component () for which the ratio of voltage change to current change is small when the voltage of the voltage-limiting component is greater than a predetermined threshold voltage. Because of the overvoltage protection thus achieved, AC chokes can be omitted from the AC terminal or at least they can be designed smaller, reducing the load-dependent voltage drop of the DC terminal.