Apparatus and method for rapid fault detection and transfer in a utility-interactive uninterruptible power supply
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United States of America Patent
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Jul 27, 2004
Grant Date -
Jan 31, 2002
app pub date -
Jun 1, 2001
filing date -
Jun 1, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and apparatus are disclosed for improving the disturbance pass through characteristics of a line interactive uninterruptible power supply ('UPS'). One disclosed technique uses a naturally commutated fast utility disconnect switch, wherein the switch is self commutated by the UPS inverter forcing the current through the switch to zero. A second disclosed technique uses a gate commutated fast utility disconnect switch and the associated snubber circuits, wherein the fast utility disconnect is opened quickly upon occurrence of a line fault and the energy generated in interrupting the line current is dissipated by the snubber circuits.
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