This paper presents the power stage, the control design and the validation of a 1.5 kW bidirectional DC-DC converter for auxiliary supply of electric loads in Hybrid Electrical Vehicles (HEVs). Compared to traditional DC-DC converters for similar applications, the proposed topology has the advantages of a simple circuit capable of bi-directional energy transfer from the 12 V DC bus and the high voltage DC bus used for traction. Active clamping implementation in the boost mode and soft-switching operation due to phase shift modulation in the buck mode, without additional devices, high efficiency and simple control are key features. The control algorithm is implemented on 32-bit microcontroller, giving high advantages in terms of cost, flexibility and also efficiency increase due to the possibility of easy synchronous rectification implementation. These advantages make the proposed converter promising for medium and high power applications especially for auxiliary power supply in HEVs where the high power density, low cost, lightweight and high reliability are main concerns. The operating principle, theoretical analysis, and design guidelines are provided in this paper. The simulation and the experimental verifications are also presented by means of a 1.5 kW lab prototype.
High efficiency auxiliary power converter for HEV applications
Hilfsenergie-Umrichter mit hohem Wirkungsgrad für hybridelektrische Anwendungen
2008
13 Seiten, 16 Bilder
Conference paper
English
High efficiency auxiliary power converter for HEV applications
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