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:
Apr. 20, 1999
Filed:
Nov. 25, 1997
Jeff Gucyski, Huntington Beach, CA (US);
Robert William Johnson, Jr, Raleigh, NC (US);
Rune Lennart Jonsson, San Diego, CA (US);
Exide Electronics Corporation, Raleigh, NC (US);
Abstract
An uninterruptible power supply (UPS) includes a transformer, a low voltage converter (02), a rectifier, and a high voltage inverter (01). The low voltage converter comprises a battery, a first switching device (Q3), a second switching device (Q4), and first drive circuits (41, 42). The high voltage inverter (01) includes first and second load terminals adapted to be coupled across a load in an emergency situation; an output capacitor (C); a third switching device (Q1) and a fourth switching device (Q2), and second drive circuitry (43, 44) for driving the third and fourth switching devices from conducting to non-conducting states and vice versa so as to produce a quasi-sinusoidal output voltage waveform across the load terminals.