A Two-Switch, Isolated, Three-Phase AC–DC Converter

Duty-Cycle Dependent Phase Shift Modulation of Dual Three-Phase Active Bridge Four-Port AC–DC/DC–AC Converter Eliminating Low Frequency Power Pulsations

“…The scaling factor P 0 in (13) was determined in the course of the analysis of the operating modes of the DAB presented in [29] and contains all hardware-specific values,…”

“…It is to be noted that the indices denoting the converter phases are omitted in (13) to provide a more comprehensible description of the subsequent derivations. Accordingly, the variables p, D 1 , and D 2 are to be replaced by the variables of the DAB converter part to be evaluated, e.g., by p aA , D 1,a , and D 2,A in case of converter phases a-A.…”

“…Accordingly, the variables p, D 1 , and D 2 are to be replaced by the variables of the DAB converter part to be evaluated, e.g., by p aA , D 1,a , and D 2,A in case of converter phases a-A. As shown in Appendix A, (13) is conceived in such a way that a significant increase of P Σ is achieved (compared to the previous approach presented in [29]) and that the constraints ( 9) and ( 10) are met for sinusoidal duty cycles according to ( 5) and ( 6), regardless of the values of the seven coefficients, a 0 . .…”

“…where T , T 1 , and T 2 refer to the periods of y 1 (t) + y 2 (t), y 1 (t), and y 2 (t), respectively. In this regard ( 20) is applied to (13) to establish a relation between P Σ , a 0 , and a 2 ,…”

“…In the context of improving the efficiency and/or volume requirements of power electronic circuits, the integration of several converter stages into a single converter stage is of particular importance. Examples of documented rectifiers with integrated galvanic isolation are the current-fed rectifiers with integrated LLC resonant converter described in [11] or with a DAB converter presented in [12], the rectifier with integrated full-bridge dc/dc converter presented in [13], the rectifier with integrated three-phase DAB converter explained in [14], or the nine-switch converter with integrated three-phase resonant converter described in [15]. These topologies are complemented by further rectifier topologies with integrated galvanic isolation, but without a primary-side dc voltage port, such as matrix-type converters [16], [17] and Swiss-type converters [18], [19].…”