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12 | 1.0 Product Description
1.4 Major Components
The operating principle of the UPS is illustrated in Figure 3.
L1
L2/N
G
Figure 3: Operating principle diagram
The UPS is composed of utility input, SPD and Emi/rFi filters, rectifier/PFC, inverter, battery charger, DC-DC converter,
battery, dynamic bypass, and UPS output.
1.4.1 Surge Protection Device (SPD) & EMI/RFI Filters
The S4K2UC has surge protection and filters that protect the connected load from power surges, electromagnetic inter-
ference (Emi) and radio frequency interference (rFi). These features can minimize any surges or interference present in
the utility power. The filters also prevent surges or interference generated by the UPS from adversely affecting devices
connected on the same branch as the UPS.
1.4.2 Rectifier/Power Factor Correction (PFC) Circuit
in normal operation, the S4K2UC's rectifier/power factor correction (PFC) circuit converts utility power to regulated DC
power for use by the inverter, while ensuring that the wave shape of the input current used by the UPS is near ideal.
Extracting this sine wave input current achieves two objectives:
Efficient power use by the UPS
•
reduced reflected harmonics
•
This results in cleaner power being available to other devices in the building not protected by the S4K2UC.
Input
SPD & EMI/
RFI Filters
Battery
Charger
Dynamic
Bypass
Rectifier /
PFC
DC-DC
Converter
Battery
Output
Inverter
L1
L2/N
G
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