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This paper presents a PEM fuel cell dynamic modeling, to be employed with electronic circuit simulator software -PSIM. Simulations of the proposed model for the fuelcell, supplying a step-up DC-DC converter are presented. Comparisons with existing models are also made. Practical results are presented in this paper for a Ballard 1.2kW Nexa Power Module for theoretical-experimental comparisons. Index Terms--Dynamic Model, Circuit simulator, Fuel cell. I. NOMENCLATURE E o cell's maximum theoretical voltage at open circuit(V) E N cell's reversible voltage no-load (V) T temperature in Kelvin (K) R universal gas constant (8314 JK/mol) F Faraday constant (96487 C) PH 2 hydrogen pressure (atm) PO 2 oxygen pressure (atm) CH 2 hydrogen concentration (mol/cm 3 ) CO 2 oxygen concentration (mol/cm 3 ) V Ω ohmic losses (A) R a equivalent activation resistance (Ω) R s membrane and electrodes resistance (Ω) R auxiliary resistance for the model (Ω) L auxiliary inductance for the model (H) C cell's equivalent capacitance (F) τ cell's time constant (s) i fuel cell's current (A) V activ activation losses (V) V conc concentration losses (V) V cell cell's output voltage (V) thickness of the membrane (m) α transference coefficient n reagent moles number n c number of cells in stack i L cell's maximum current (A).

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