Research on control of fuel cell based push-pull forward converter

With the depletion of traditional energy, wide research is focused on the fuel cell which acts as a novel green energy resource. Due to the wide output voltage of the fuel cell, the research on the converter which utilizes the electricity is the key point to exploit the fuel cell effectively. In this paper, the soft character of the fuel cell's output voltage is analyzed. According to this character, existing' control technology is analyzed and choosed. It can be observed that the average current control can eliminate this problem based on the small signal modeling of the push pull forward converter. The control parameters are designed based on the theoretical analysis. At last, experimental results prove that average current control can solve the source effect problem effectively. At the same time, to solve the reversible voltage spike problem of the rectifying diodes of the converter, double CDD passive and lossless clamp circuits is proposed. Experimental results shows satisfying results and it is valuable to engineering application.