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This paper proposes a transformer-less modular multilevel DC/DC converter. The proposed converter can be used to interconnect two HVDC systems with different dc voltage levels and realize bidirectional power flow. Based on the arm energy balance condition, the optimal design arming at minimum inner circulating current is presented. A power close-loop control method is adopted to regulate the converter...
Paper deals with LCLC converter with DC output. Both current and voltage sourced output rectifiers are considered. The performance investigation is focused on the nominal and overload operation conditions. Several differences are discovered during transient and steady — state analysis. Most significant is the existence of "zero-voltage interval" (ZVI) at the parallel resonant tank of the...
In this paper, a novel topology of the high step-up multiphase galvanically isolated impedance-source DC-DC converter is proposed. It was derived by the input-parallel-output-parallel cascading of the asymmetrical quasi-Z-source half-bridge cells. The operating principle of the converter is explained by the steady state analysis. It was also demonstrated how the input current ripple of the converter...
In this paper, a hybrid interleaved and isolated micro-converter (5V/2A/1MHz) dedicated to low power conversion is presented. In order to be able to address a lot of different applications, its structure is isolated (implementation of a planar coupler) and uses interleaved parallel legs with coupled inductors (lowering internal losses). For very high integration purpose, two chips have been done:...
This article presents a modular approach to generate the interleaved carriers of a parallel converters. Compared with previous solutions requiring accurate analog computations, a straightforward implementation of the generator is proposed here. By using only comparators and logical gates dedicated to the tuning of the carrier phase, a correct interleaving of the carriers is obtained in steady-state...
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