A Refined Loss Evaluation of a Three-Switch Double Input DC-DC Converter for Hybrid Vehicle Applications

Abstract

In this paper, an accurate efficiency evaluation of an innovative three-switch double input DC–DC converter for hybrid vehicle applications was carried out. The converter was used to interface two storages, (e.g., supercapacitor and battery) to the DC link. A refined model was created in MATLAB/Simulink Plecs environment and it was used to compare the traditional four-switch converter (i.e., two DC–DC converters in parallel connection) with the innovative three-switch converter. Loss and efficiency contour maps were obtained for both converters and a comparison between them was performed. A prototype of the three-switch converter was realized and used to validate the simulation thermal model by comparing both efficiency and current waveforms obtained with simulations and experimental tests.

A New Feed-Forward Control for Dynamics Improvement in a Dual-Input DC–DC Converter for Hybrid Vehicle Applications

“…In this Section, some simulation results have been reported to compare the feedforward (FF) method presented in this paper with the previous control in [30,32]. The system has been implemented in the MATLAB/Simulink/PLECS environment, and the converter parameters are reported in Table 2.…”

“…ward (FF) method presented in this paper with the previous control in [30,32]. The has been implemented in the MATLAB/Simulink/PLECS environment, and the co parameters are reported in Table 2.…”

“…This innovative converter structure does the same job as two half-bridge converters with a parallel connection; however, it only uses three switches (four switches are needed when using two half-bridge converters). In addition to that, the three-switch converter proposed for the first time in [29] ensures higher efficiency in comparison to two halfbridges converters, as explained in [29], and analyzed in detail in [30]. Nevertheless, with the modulation strategy proposed in [29], the converter works in continuous conduction mode (CCM) even at low load (i.e., it allows current inversion during the switching period); as a consequence, the efficiency drops significantly in this working region.…”

Synthesis and Analysis of Three-Port DC/DC Converters with Two Bidirectional Ports Based on Power Flow Graph Technique

“…There are many ways of deriving the TPCs' configuration, as explained previously in [15][16][17][18]24]. In [15], a systematic analytical technique for different configurations is constructed based on the power flow graph tool.…”

Double input DC-DC converter for highly flexible and reliable Battery Storage Systems

“…A new double-input bidirectional boost architecture has been proposed in [15], where only three switching devices are utilized, whereas the more conventional solution made of two half-bridge converters connected in parallel uses four switching devices. The efficiency of the proposed DC-DC converter has been analyzed in [16] and a new modulation strategy has been developed and introduced in [17], exploiting the operation in Discontinuous Conduction Mode (DCM) at low-loads. In this study, this innovative DC-DC boost converter is considered, and after presenting its architecture and control principles, some simulation tests will be shown.…”