Abstract
In this paper, an integrated three-voltage-booster DC-DC (direct current to direct current) converter is proposed to achieve high voltage gain for renewable-energy generation systems. The proposed converter integrates three voltage-boosters into one power stage, which is composed of an active switch, a coupled-inductor, five diodes, and five capacitors. As compared with conventional high step-up converters, it has a lower component count. In addition, the features of leakage-energy recycling and switching loss reduction can be accomplished for conversion efficiency improvement. While the active switch is turned off, the converter can inherently clamp the voltage across power switch and suppress voltage spikes. Moreover, the reverse-recovery currents of all diodes can be alleviated by leakage inductance. A 200 W prototype operating at 100 kHz switching frequency with 36 V input and 400 V output is implemented to verify the theoretical analysis and to demonstrate the feasibility of the proposed high step-up DC-DC converter.
Highlights
In recent years, owing to the shortage of fossil fuels and the serious problems of environmental pollution, discovering and developing alternative energy resources has become more and more important
The terminal voltages of PV module, fuel cells, or battery set are less than 45 V. These green-energy generation units require a high step-up converter to serve as a voltage boosting interface between the generation unit and the utility
This paper proposes a novel high step-up converter, which incorporates three voltage boosters and integrates them into one stage
Summary
In recent years, owing to the shortage of fossil fuels and the serious problems of environmental pollution, discovering and developing alternative energy resources has become more and more important. The terminal voltages of PV module, fuel cells, or battery set are less than 45 V. That is, these green-energy generation units require a high step-up converter to serve as a voltage boosting interface between the generation unit and the utility. Conventional boost converters can achieve high voltage gains by means of extreme duty ratio operation [3,4,5,6]. This will result in large current ripple, significant conduction loss, and heavy current stress on power devices. In order to resolve this problem, converters with transformers, such as flyback, forward, and push-pull units, are considered [7,8,9,10]
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