中文摘要：

为燃料电池车提出了一种复合直流系统方案,该方案采用DSP控制单个DC/DC变换器实现直流系统能量的统一管理。变换器有4种工作模式,且可归纳为两种电路拓扑：串并联谐振变换器和串联谐振变换器。详细分析了串并联谐振变换器的软开关实现条件,由于考虑了变压器副边整流开关管寄生电容对死区时间内换流过程的影响,故分析得到的励磁电感限制条件更加精确。给出了该复合直流系统的设计与实现方法。最后搭建了一台基于TMS320F28335的300W样机,实验结果验证了该系统的可行性。

英文摘要：

A scheme of compound DC system for fuel cell vehicles is proposed, which uses a digital signal processor to control a single DC/DC converter to achieve unified energy management of DC system. There are four different working modes and they can be classified into two circuit topologies： series / parallel resonant converter and series resonant converter, in which the soft switching condition of series and parallel resonant converter is ana- lyzed in detail. By taking into account the effects of the parasitic capacitance of rectifying transistor in the secondary side of transformer on the process of dead time commutation, the analyzed critical condition of magnetizing inductance is more accurate. The design and implementation methods of the compound DC system are also given. Finally, a 300W prototype is build based on TMS320F28335 and the experiment results verify the feasibility of the system.