Analysis, Control and Implementation of a High-Power Interleaved Boost Converter for Fuel Cell Hybrid Electric Vehicles

Multi-channel DC/DC converters have received an increasing attention in recent years for high power applications. This paper presents an analysis, design and implementation of a high-power multileg interleaved DC/DC boost converter with a digital signal processor (DSP) based controller. This research focuses on non-isolated DC/DC converter that interfaces the fuel cell to the powertrain of the hybrid electric vehicles. In this paper, two-phase interleaved boost converter (IBC) with digital phase-shift control scheme is proposed in order to reduce the input/output ripples and to reduce the size of the passive components with high efficiency for high power applications. On the other hand, the digital control based on DSP is more convenient than other methods to achieve the synchronization and phase shifted operation for interleaved converters. To realize the proposed control in DSP, a real time workshop (RTW) is used for automatic real-time code generation. The proposed converter, IBC, is compared with other topologies, such as conventional boost converter (BC) and multi-device boost converter (MDBC) in order to examine its performance. Moreover, a generalized small-signal model with complete parameters of these DC/DC converters is derived, which has not been discussed earlier. The PWM DC/DC converter topologies and their control are designed and investigated by using Matlab/Simulink. A 30 kW two-phase interleaved boost converter has been realized and successfully tested in our laboratory. Experimentally, a dual-loop average current control implemented in TMS320F2808 DSP is employed to achieve the fast transient response. Furthermore, the simulation and experimental results are provided. Copyright (C) 2011 Praise Worthy Prize S.r.l. - All rights reserved.