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1.4. Inverter
The inverter is composed of IGBT, inductor, capacitor, snubber, control circuitry and
protection circuitry. The inverter converts the DC power from the DC bus to AC power
to supply the output load. The UPS uses IGBT technology which switches at
frequencies beyond the audible range, therefore producing no audible noise.
The UPS uses voltage regulation circuitry to limit the voltage variation within 1%.
Special compensation circuitry is added to eliminate the output distortion. Every
component is oversized to accept the wide DC input range (from 285 to 420VDC), so
that the output waveform remains sinusoidal throughout the range. With the aid of
dynamic feedback loop the inverter will keep a sine waveform even under non-linear
load.
An independent inverter is used for each phase. Although it is more expensive, each
inverter has its independent feedback, so that the voltage is unaffected when load is
added to the adjacent phase, producing excellent voltage regulation under 100%
unbalanced load.
The IGBT is operated in its optimal condition to obtain best efficiency, so as to
minimize the power cost of the user.
DC+
AC
AC
DC-
IGBT INVERTER
1-10
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