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:
Aug. 28, 1990
Filed:
Aug. 30, 1989
Michael Braun, Herzogenaurach-Niederndorf, DE;
Hans-Dieter Heining, Nuremberg, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A method of operating a three-step inverter that supplies a polyphase machine whose electric output variables are formed by scanning two zero-shifted setpoint signal sets with triangular modulation signal, in a space vector representation using double modulation. A first or second interval value is formed between the maximum or minimum value of phase signal waveforms of the setpoint signal sets and an upper or lower scanning limit. The first and second interval values are added or subtracted from the phase signal waveforms of the first and second setpoint signal sets, to thereby increase the linear control range of the inverter and reduce the harmonic spectrum in the inverter output signals.