Theory of operation – MGE UPS Systems S3 User Manual
Page 41
This section describes the theory of operation of the Topaz
S3 Inverter systems.
The inverter utilizes a "Fly-back" converter to boost the input
voltage to two regulated +/- 200 volt outputs. Two identical
inverters are contained in the unit, both inverters controlled
by a single PWM to generate sinusoidal AC outputs. The two
inverters can be connected in parallel to produce 120 VAC
output or connected in series for 240VAC output.
This
approach minimizes the size and weight of the magnetics
since both the battery booster and inverter operate at
relatively high frequency, greater than 20 kHz.
A modular
approach was taken which allows easy field replacement of
the inverter module without removing power from the load.
Figure 3-1 is a block diagram of the inverter.
3.1
General Description
of the Inverter
3.0
Scope
3 — 1
Theory of Operation
Theory of Operation