Digitally-controlled AC voltage stabilizer
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United States of America Patent
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Jul 9, 2002
Grant Date -
N/A
app pub date -
May 2, 2001
filing date -
May 2, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
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.sub.max =(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.
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