Abstract
In this paper, a novel isolated bidirectional DC-DC converter is proposed, which is able to accomplish high step-up/down voltage conversion. Therefore, it is suitable for hybrid electric vehicle, fuel cell vehicle, energy backup system, and grid-system applications. The proposed converter incorporates a coupled inductor to behave forward-and-flyback energy conversion for high voltage ratio and provide galvanic isolation. The energy stored in the leakage inductor of the coupled inductor can be recycled without the use of additional snubber mechanism or clamped circuit. No matter in step-up or step-down mode, all power switches can operate with soft switching. Moreover, there is a inherit feature that metal–oxide–semiconductor field-effect transistors (MOSFETs) with smaller on-state resistance can be adopted because of lower voltage endurance at primary side. Operation principle, voltage ratio derivation, and inductor design are thoroughly described in this paper. In addition, a 1-kW prototype is implemented to validate the feasibility and correctness of the converter. Experimental results indicate that the peak efficiencies in step-up and step-down modes can be up to 95.4% and 93.6%, respectively.
Highlights
In order to reduce carbon emission and mitigate global warming, green energies, such as photovoltaic (PV) panel, fuel cells, and wind turbine, attract a great deal of interest and have a high rate of growth in installed capacity
If a converter operates in discontinuous conduction mode (DCM), it can avoid switching loss
This paper has proposed a high efficiency and high voltage-ratio isolated bidirectional DC-DC
Summary
In order to reduce carbon emission and mitigate global warming, green energies, such as photovoltaic (PV) panel, fuel cells, and wind turbine, attract a great deal of interest and have a high rate of growth in installed capacity. Conventional high step-up converters used in PV panel and fuel cells can boost a low voltage to a higher level to serve as an interface between the distributed generator and the DC bus [1,2,3] They only control power flow in unique direction. Heavy switch duty cycle is the only solution to this problem, problem, but this approach will degrade converter efficiency. A novel BDC is proposed, which has the advantages of galvanic isolation, high voltage conversion ratio, soft-switching feature at all power switches, high efficiency, being suitable voltage conversion ratio, soft-switching feature at all power switches, high efficiency, being suitable for high power applications, and low component count.
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