DocumentCode :
2250873
Title :
Influence of the modulation method on the conduction and switching losses of a PWM converter system
Author :
Kolar, Johann W. ; Ertl, Hans ; Zach, Franz C.
Author_Institution :
Power Electron. Sect., Tech. Univ. Vienna, Austria
fYear :
1990
fDate :
7-12 Oct. 1990
Firstpage :
502
Abstract :
The dependency of the conduction losses of a bridge leg of a PWM power converter system with a high pulse rate on the shape of the phase modulation functions is explored. This is done for modulation methods which are optimized with respect to minimum harmonic current RMS values. The results are compared to the results gained for simple sinusoidal modulation. Besides the conduction losses, the switching losses of the electric valves are calculated. Deviations from the classical sinusoidal modulation are only obtained for modulation methods for which the output voltage is formed by a cyclic change via only two active and a third nonswitching bridge leg. As the calculations show, these modulation methods allow a significant increase of the effective switching frequency. This effect is dependent on the phase angle between the fundamental of the converter output phase voltage and the converter output phase current; for this comparison, equal switching losses, as for the simple sinusoidal modulation, are assumed.<>
Keywords :
bridge circuits; harmonics; losses; phase modulation; power convertors; pulse width modulation; switching; PWM; conduction losses; electric valves; frequency; fundamental; harmonic current; output voltage; phase modulation; power converter; switching losses; Bridge circuits; Leg; Phase modulation; Pulse shaping methods; Pulse width modulation; Pulse width modulation converters; Shape; Switching converters; Switching loss; Voltage;
fLanguage :
English
Publisher :
ieee
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
Type :
conf
DOI :
10.1109/IAS.1990.152232
Filename :
152232
Link To Document :
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