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In this thesis, a dynamic energy interpolating ircuit is
proposed to substitute for the static transferwitch (STS) of
the off-line UPS's. This circuit is ableo provide the output
for off-line UPS's about 4 milli-econds while a blackout occurs
but the inverter doesn'ttart to take over the UPS output yet.
It means that theff-line UPS with dynamic energy interpolating
circuitill have the feature of zero transfer time switching
fromhe line mode to the inverter mode. This circuit consistsf a
transformer booster and AC capacitors which areesonant with
each other in the utility frequency. Thewitched-capacitor
technique is included to overcome theoltage drop of the
resonant circuit for achieving theominal output voltage after
utility blackout. One methodf detecting the blackout point is
also introduced.
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