Analysis, control and comparison of DC/DC boost converter topologies for fuel cell hybrid electric vehicle applications

Interleaving techniques are widely used to reduce input/output ripples, to increase the efficiency and to increase the power capacity of the boost converters. 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 current ripples, to reduce the output voltage ripples and to reduce the size of passive components with high efficiency for high power applications. The digital control based on DSP is proposed to solve the associated synchronization problem with interleaving converters. In addition, the real time workshop (RTW) is used for automatic real-time code generation. The proposed converter 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. The PWM DC/DC converter topologies and their control are simulated and investigated by using MATLAB/SIMULINK. 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.

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