Abstract
This paper deals with a hybrid non-isolated active quasi-switched dc-dc converter with a high-boost voltage gain, which is applicable for the high step-up low power applications. By using fewer number of components in circuit topology, the proposed converter can provide higher-gain voltage with a small duty cycle, which can reduce the voltage stress and conduction loss on power switches. In addition, it draws continuous input current, has lower diode voltage stress and lower passive component voltage ratings. The operating principles and key waveforms in continuous conduction mode and discontinuous conduction mode are presented. Small-signal dynamic analysis, parameter design guideline, power loss calculation, and characteristics comparison with other non-isolated converters have been completed. Finally, a 250W hardware prototype is constructed and the experimental results are presented to verify the feasibility of the proposed converter.
Highlights
With the large consumption of traditional fossil energy and the increasing awareness of environmental protection, the development and utilization of renewable energy sources, such as solar, wind, and fuel cells, has become more and more important
Many high boost dc-dc converter topologies have been developed and investigated to produce high voltage gain, which can be divided into two categories: isolated and nonisolated circuit topologies
COMPARIOSN OF NUMBER OF COMPONENTS Table II shows the comparison of number of passive and active components used in these high boost converters
Summary
With the large consumption of traditional fossil energy and the increasing awareness of environmental protection, the development and utilization of renewable energy sources, such as solar, wind, and fuel cells, has become more and more important. The operating duty cycle range of the above boost-based nonisolated dc-dc converters is wide, which is varied from 0 to 1 In this case, a larger duty cycle will be utilized to produce a higher voltage gain, which will induce high conduction power loss on active power switches. A new hybrid nonisolated active quasiswitched dc-dc converter with high step-up voltage conversion ratio is proposed, as shown, which has the following main advantageous features: high output voltage gain with a small duty cycle, low voltage stress across power switches and output diode, simple structure and easy to control.
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