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. 13, 1990
Filed:
May. 10, 1989
Theodore G Hollinger, Redmond, OR (US);
APC-Onsite, Inc., Redmond, OR (US);
Abstract
Three-phase power-conversion wherein the frequency output voltage is independent of the frequency of input voltage. One of three input terminals in a load powered by the apparatus is directly grounded. Each of the other two input terminals is supplied a sinusoidal voltage artifact from an appropriate transform circuit which is driven by a microprocessor, with one of these artifacts having a form 1.73.alpha.SinA, and the other having the form of 1.73.alpha.Sin(A+60.degree.), where .alpha. is the nominal amplitude of the source voltage and the Expressions A and (A+60.degree.) are the respective phase angles. Operation of the microprocessor controls output frequency.