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EMI/RFI
FILTER
CONVERTER
AC INPUT
+
-
BATTERY
LOAD
INNVERTER
DC
AC
1. Introduction
Overview
This SwitchUPS is a high performance standby uninterruptible power system
(UPS) designed to provide clean, reliable AC power to computer loads and
electronic devices. When utility failure, low or high voltage intermittently, UPS
can feed your computer or electronic appliances without any interruption. It
can keep you away from brownouts, spikes, lightning and high frequency
interference. It can automatically save your computer data, protect your
software, even the hardware, to ensure your computers or precision equipment
work functionally and efficiently.
1.1
Operation principle
1.1.1
Utility normal: The UPS offers the pure and stable AC output power by
the synchronous voltage regulator and EMI/RFI filter. A unique mode of
operation, named AutoBoost, serves to regulate the load voltage by
compensating for brownouts or sags, and AutoTrim allows continuous
on-line operation during over line voltage conditions. This is
accomplished without the need to draw power from the UPS
’
s battery.
In anticipation of utility failure, the UPS continuously monitors the line
and prepares the inverter frequency for synchronous transfer of the
load.