A Current-Fed Hybrid Dual Active Bridge DC–DC Converter for Fuel Cell Power Conditioning System with Reduced Input Current Ripple
In this chapter, a novel current-fed hybrid dual active bridge DC–DC converter is proposed, which is suitable for low-voltage fuel cell power conditioning system. The high-frequency input current ripple can be reduced to minimum because the input-side switches are always switched at 50% duty cycles in spite of the fuel cell voltage and the load variation. Notch filter is used in the voltage feedback path to reduce the low-frequency input current ripple when interfaced with a single-phase inverter load. All of the power devices can achieve zero-voltage switching on by the proposed control strategy. The mode analysis, the operation principle, ZVS conditions, and parameter design are given in this chapter. A 1 kW prototype has been fabricated to verify the effectiveness of the proposed converter and control strategy.
KeywordsDC–DC converter Fuel cell Zero-voltage switching Current ripple
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