用于燃料电池电动汽车的双单端正激变换器

由于燃料电池的输出特性比较软,难以直接与电动汽车的电机驱动器相匹配,必须采用DC/DC变换器来改善其输出特性.采用正激变换器必须要有磁复位电路才能正常工作.单管正激变换器由于输出功率不大、效率不高,不能满足电动汽车对DC/DC变换器大功率输出的要求,而双单端正激变换器则能够从质量、效率、体积和可靠性等方面满足燃料电池电动汽车对DC/DC变换器的要求,是合适的DC/DC变换器主电路方案.据此分析比较了正激变换器的4种磁复位技术,在此基础上,详细分析了双单端正激变换器的工作原理和独特优点,并对双单端正激变换器在燃料电池电动汽车中应用的可行性及相应的控制方案进行了研究.

Double Cycle Feed Forward Converter Used in Fuel Cell Electrical Vehicle

Because the soft output characteristics of fuel cell are difficult to match with motor driver, DC/DC converter must be used to improve the output characteristics. Only with the magnetic reset circuit,can the forward converter work. Since the single cycle feed forward converter can not satisfy the demanding for electrical vehicle, the double cycle feed forward converter is suitable for the main circuit for DC/DC converter. This paper analyzes four kinds of magnetic reset technology of the forward converter. On this base, the paper analyzes the principle and special characteristics of the double cycle feed forward converter in details, and studies the application feasibility and controlling design of this converter in fuel cell electrical vehicle.