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. 09, 1993
Filed:
Oct. 24, 1991
Gary L Galloway, Rockford, IL (US);
Thomas S Latos, Huntley, IL (US);
Derrick Roe, Rockford, IL (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
The problem of minimizing DC content in a dual converter system (18) is addressed with dual inverters (36,38) having outputs connected in parallel through an interphase transformer (42). The outputs for each phase are connected through a neutral forming transformer (43) to develop a reference. The output voltage at each phase is sensed, filtered and averaged to develop a signal representing DC content in each of the output phase voltages. A master controller (40-1) develops switching signals for the master inverter (36) which signals are modified based on the DC content of the output phase voltages to minimize the same. A current transducer (44) for each phase senses differential current output from the master and slave inverters (36 and 38) for each phase. This signal is used to modify PWM patterns from a slave controller (40-2) for minimizing DC content through the interphase transformers (42).