In this paper a novel solution for phase current sensing in PWM–VSI based AC drives is presented, based on a resistive sensors put in series to the lower switches of the inverter legs. It allows current sensing during each modulation cycle within the whole operating area of the inverter. Inside the overmodulation area a simple but effective modification of the modulation pattern is proposed which does not increase the complexity of the implementation almost at all. Encumbrance, complexity and cost resemble the solution using a single sensor on the DC link, but almost no operating limitations are introduced. Experimental results are presented in order to show the performance and effectiveness of the proposed method.
A Novel Solution for Phase Current Sensing in PWM-VSI Based AC Drives
PARASILITI COLLAZZO, Francesco;TURSINI, MARCO
2001-01-01
Abstract
In this paper a novel solution for phase current sensing in PWM–VSI based AC drives is presented, based on a resistive sensors put in series to the lower switches of the inverter legs. It allows current sensing during each modulation cycle within the whole operating area of the inverter. Inside the overmodulation area a simple but effective modification of the modulation pattern is proposed which does not increase the complexity of the implementation almost at all. Encumbrance, complexity and cost resemble the solution using a single sensor on the DC link, but almost no operating limitations are introduced. Experimental results are presented in order to show the performance and effectiveness of the proposed method.Pubblicazioni consigliate
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