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This paper analyzes the steady-state characteristics of pulse-link DC-AC converters applying input current-ripple reduction methods in fuel cell applications. In that kind of applications, small input... current-ripple is essential. This limitation is caused by the fuel-cell chemical reaction time. Excessive and pulsed current drawn from the fuel-cell may result in less life-time or damage. In order to reduce the input current-ripple, conventional DC-AC converters for fuel-cell applications normally have large smoothing capacitor placed between boost converter stage and PWM converter stage. However, this capacitor consumes additional space, weight, and cost. A novel topology called pulse-link DC-AC converter is proposed in order to solve the abovementioned issue. This new topology does not require large capacitor value to minimize the input current-ripple. Instead, it uses series-LC circuit placed in parallel between two connected stages. The mechanism of current-ripple reduction is presented. Experimental results showing input current ripple as small as 0.3 A with only small inductance and capacitance value is also demonstrated.show more
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