Page 73 - Electromechanical Devices and Components Illustrated Sourcebook

Chapter 3 Power Sources 35

Filter Capacitor It should be noted that the utilities are intended to supply
Full-Wave Bridge
Batteries nonessential equipment and will lose power during a power
Transient AC Synthesizer failure.
Suppresser
Figure 3-58 shows a typical commercial UPS that is appro-
− Electronic Switch priate for desktop computers.
+

Voltage Regulator
Alarm
Outlets on
Rear Panel
Utility Outlets
Protected Outlets
Figure 3-57 Uninterruptible Power Supply (UPS) Schematic
Test
Power
to the protected outputs. In the event of a power failure, the AC
synthesizer automatically generates AC power from the bat- UPS 500 Case
teries, which is directed to the electronic switch. The switch
turns off the feed from the suppressor and turns on the feed Rubber Foot AC Input
from the synthesizer. The protected outlets are fed synthe- Figure 3-58 Commercial Uninterruptible Power Supply
sized AC until the power is restored or the batteries are spent. (UPS)