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, 2000
Filed:
Aug. 10, 1999
Johann W Kolar, Vienna, AT;
ABB Patent GmbH, Mannheim, DE;
Abstract
An apparatus for conversion of a three-phase voltage system into an electrically isolated DC voltage to be predetermined freely, and a method for controlling the same, include primary and secondary circuits. Each phase of the primary circuit has a series inductance connected to one input of a bidirectional, bipolar electronic switching apparatus. Second inputs of the switching apparatuses are directly connected. A positive primary voltage rail is fed through diodes, and a negative primary voltage rail is fed through other diodes. One winding end of a primary winding of a transformer is connected to a line connecting the second inputs of the switching apparatuses. A power transistor, which is connected to the positive primary voltage rail on the collector/drain side and has an antiparallel connected diode, is connected to another winding end of the primary winding. A further power transistor, which is connected to the negative primary voltage rail on the emitter/source side and has an antiparallel connected diode, branches off from the other winding end of the primary winding. A secondary winding of the transformer is connected to input terminals of a single-phase diode bridge having a capacitance disposed between output terminals and smoothing the output voltage as a full-wave bridge circuit.