Abstract
An analysis of DC-DC converter-driven direct ethanol fuel cell systems is presented. The output voltage characteristics of two systems—boost-driven and buck-boost-driven systems—are compared. Experimental results show that direct ethanol fuel cells exhibit variable non-linear impedances as a function of frequency. It is shown that DC-DC converter-driven direct ethanol fuel cell systems do not exhibit a predictable output as a function of duty cycle alone, in both boost and buck-boost configurations. The analysis shows that Ni-foam anode direct ethanol fuel cell and Ni-mesh anode direct ethanol fuel cell output voltage characteristics become nearly identical at switching frequencies beyond 6 kHz.
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