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> Archives > Current Issues |
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JPE, Vol. 19, No. 1, January 2019 |
Self-Feeder Driver for Voltage Balance in Series-Connected IGBT Associations
A. F. Guerrero-Guerrero, A. J. Ustariz-Farfan, H. E. Tacca, and E. A. Cano-Plata
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Area |
High Power Converters |
Abstract |
The emergence of high voltage conversion applications has resulted in a trend of using semiconductor device series
associations. Series associations allow for operation at blocking voltages, which are higher than the nominal voltage for each of
the semiconductor devices. The main challenge with these topologies is finding a way to guarantee the voltage balance between
devices in both blocking and switching transients. Most of the methods that have been proposed to mitigate static and dynamic
voltage unbalances result in increased losses within the device. This paper introduces a new series stack topology, where the
voltage unbalances are reduced. This in turn, mitigates the switching losses. The proposed topology consists of a circuit that
ensures the soft switching of each device, and one auxiliary circuit that allows for switching energy recovery. The principle for
the topology operation is presented and experimental tests are performed for two modules. The topology performs excellently for
switching transients on each of the devices. The voltage static unbalances were limited to 10%, while the activation/deactivation
delay introduced by the lower module IGBT driver takes place in the dynamic unbalances. Thus, the switching losses are reduced
by 40%, when compared to hard switching configurations. |
Keyword |
Energy storage,IGBT,Power supplies,Snubber circuit,Soft switching circuits,Switching transients |
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