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:
Jul. 09, 2002
Filed:
May. 02, 2001
James W. Kronberg, Aiken, SC (US);
Other;
Abstract
A voltage stabilizer apparatus with digitally-controlled emulation of servotransformer operation to provide smooth voltage control. Tap-switching on both the primary and the secondary sides of a transformer allows a small number of relays to provide a large number of voltage step-up and step-down ratios. The maximum number of achievable ratios is equal to N =(m*n−p+1) where m is the number of primary taps, n the number of secondary taps, and p the number of taps which are common to both sets. The taps are preferably placed at approximately logarithmic intervals along the transformer winding to provide evenly-spaced step-up and step-down ratios. Additional components may include devices for sensing under- or over-voltages, preventing unwanted cycling under load, rectifiers, arc-suppression devices, circuitry for interfacing with the user's electronic equipment, and LEDs or other indicators for providing feedback on the operational state of the apparatus.