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This paper describes and evaluates 3 original step-up converter architectures able to harvest energy from low-voltage and low-power generators. Design and sizing are made according to specifications issued from the stringent characteristics of microbial fuel cells. The maximum harvested power is 10mW under input voltage Vin=0.3V (33mA input current). The considered converters include self-oscillating...
In this paper, a 10 kW current-fed DC-DC converter using resonant push-pull topology is demonstrated and analyzed. The grounds for component dimensioning are given and the advantages and disadvantages of the resonant push-pull topology are discussed. The converter characteristics and efficiencies are demonstrated by calculations and prototype measurements.
This paper describes a DC-DC converter which offer the efficiency of 98% for the 800 W fuel-cell system (FC). The authors are currently developing the power conditioner for the FC system the efficiency of which is higher than 95%. To get the efficiency, the efficiency of the DC-DC converter has to exceed 97%. To reduce switching losses, the proposed DC-DC converter consists of three identical conversion...
Influence of hydrogen fuel cell stack output current ripple caused by a one phase voltage-fed inverter system on efficiency of the fuel cell stack is investigated experimentally. The system includes hydrogen canister, 1.2 kW hydrogen fuel cell module, DC/DC step-up converter and PWM inverter. The system has two DC voltage stages: relatively low and variable voltage on the fuel cell output and stabilized...
This paper deals with a current-fed full bridge dc-dc converter. By the results of an analytical investigation, the impact of the transformer's winding ratio, its leakage inductance and dimension of input inductor on the converter's efficiency is emphasized. Out of this, design considerations for the converter are given. Experimental results, taken from a 1.2 kW prototype, are shown.
A new low-leakage-inductance low-resistance design approach to low-voltage high-power isolated boost converters is presented. Very low levels of parasitic circuit inductances are achieved by optimizing transformer design and circuit lay-out. Primary side voltage clamp circuits can be eliminated by the use of power MOSFETs fully rated for repetitive avalanche. Voltage rating of primary switches can...
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