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CASE STUDY 9
General UPS Switching Waveform
Environment:
Problem and Analysis:
Most low cost UPS used for general purposes output a square wave. However, most people
assume that a sine wave is output. Here is a sample waveform output by the UPS.
UPS for a desktop PCs sold in retail stores (1-phase 2-wire, 100V)
Low cost inverter (variable frequency drive) type1)
Commercial purpose without a compensation function for the voltage distortion, etc.2)
Note that the voltage swell or dip occurs in switching if the UPS does not compensate for the
period.
Event Voltage Fluctuation of UPS Output
Switching from
commercial
power supply to
UPS when the
power supply
drops.
Switching from
UPS to
commercial
power supply
when the power
supply recovers.
Voltage Waveform when the Power Supply Drops
(switching from commercial power sup ply to UPS)
Voltage Waveform when the Power Supply Recovers
(switching from UPS to commercial power supply)
Target:
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