Analysis of midpoint and bridge converters is presented. It is based on switching vector, which is defined as a space-vector of switching functions of a polyphase system. It can be used merely as a time domain tool where, analogously to switching functions, it is stepwise in the complex plane. With the assumption of periodicity Fourier series representation is applied to the switching vectors and the harmonic components under steady state operation are computed. Space-vector combines all the converter phases into one equation, which means that the effect of a polyphase system is seen clearly and the necessary computation is short and efficient. In order to describe the quality of the converter and to compare midpoint and bridge converters with different phase numbers performance vector and performance index are discussed.
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