Independent Double-Boost Interleaved Converter with Three-Level Output

Abstract

This paper introduces a novel converter topology based on an independent controlled double-boost configuration. The structure was achieved by combining two independent classic boost converters connected in parallel at the input and in series at the output. Through proper control of the two boost converters, an interleaved topology was obtained, which presents a low ripple for the input current. Being connected in series at the output, a three-level structure was attained with twice the voltage gain of classic boost and interleaved topologies. A significant feature of the proposed converter is the possibility of independent operation of the two integrated boost converters, in both symmetrical and asymmetrical modes. This feature may be particularly useful in voltage balancing or interconnection with bipolar DC grids/applications. The operation principle, simulations, mathematical analysis, and laboratory prototype experimental results are presented.

The Condition Number Perspective in Modeling and Designing an Electronic IDBIC Converter

“…In papers [13,14], the operation of the IDBIC converter is described and analyzed. Here, it is shown that the converter's switching states and operation modes are influenced by the value of the duty cycle.…”

“…Therefore, for CCM operation, the possible switching states of the converter are depicted in Figure 1. Moreover, in addition to the mentioned papers, the representations in Figure 1 For a duty cycle less than 50%, the switching states of the converter will be S1-S2-S5 S3, and in the case of the duty cycle exceeding 50%, the switching states will take the form of S4-S5-S4-S1 [13].…”

“…For the final two switching states, the system matrices will be For a duty cycle less than 50%, the switching states of the converter will be S1-S2-S5-S3, and in the case of the duty cycle exceeding 50%, the switching states will take the form of S4-S5-S4-S1 [13].…”

“…As a novel approach, the converter chosen for this study is the Independent Double-Boost Interleaved Converter (IDBIC), which is presented in detail in [13]. With two characteristic operation modes, the mentioned converter will be observed in continuous conduction mode (CCM), and the condition number specific to each of its operation regions will be determined.…”

Polytopic Robust Stability for a Dual-Capacitor Boost Converter in Symmetric and Non-Symmetric Configurations

“…The topology studied in this paper and shown in Figure 1 effectively reduces the volume and cost of having a (big) single-output capacitor (see, for example, [9][10][11]); this is achieved by lowering the voltage rating because of a symmetric connection of two capacitors. Although other double-series unidirectional capacitor topologies were presented in [12], the configuration used in this paper requires only two switches, can be expanded for bidirectional usage (adding two more switches), and provides significant voltage gain from moderate duty cycles, thus reducing conduction losses. Related topologies and their characteristics were also presented in a review [13] and in the literary works of [14][15][16][17]; however, none of the above include the dynamic analysis of the topology used in this paper, and, nowadays, knowing power converters' properties-such as their controllability and stability in closed-and open-loop conditions-is indispensable.…”