Title :
Output impedance of PWM UPS inverter-feedback vs. filters
Author :
Kusko, A. ; Galler, D. ; Medora, N.
Author_Institution :
Failure Anal. Associates, Inc., Westborough, MA, USA
Abstract :
The output impedance of an uninterruptible power supply (UPS), which determines the voltage distortion caused by switchmode power supplies, rectifiers, and other nonlinear loads, is reviewed. Step-wave inverters that use shunt filter traps to attenuate the voltage harmonics and thereby present a low impedance to the harmonic load currents of the same order are discussed. Another approach to reducing the output impedance of pulse-width modulation (PWM) inverters, using the negative-feedback technique of the amplifier, is also discussed. Conclusions concerning the use of filters and feedback in the design of PWMs for UPSs are summarized.<>
Keywords :
electric impedance; feedback; filters; harmonics; invertors; pulse width modulation; rectifiers; switched mode power supplies; uninterruptible power supplies; PWM UPS inverter; negative-feedback; nonlinear loads; output impedance; rectifiers; shunt filter traps; switchmode power supplies; uninterruptible power supply; voltage distortion; voltage harmonics attenuation; Impedance; Power harmonic filters; Power supplies; Pulse amplifiers; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Rectifiers; Uninterruptible power systems; Voltage;
Conference_Titel :
Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-87942-553-9
DOI :
10.1109/IAS.1990.152313
