Abstract
A cascaded-like high-step-down converter (CHSDC) is proposed in this article, which can steeply convert a high voltage to a much lower level without the utilizing of extreme turns ratio or duty ratio. The proposed converter integrates two buck-boost converters and one forward converter to form a single-stage architecture containing only a single low-side driving switch, which, as a result, can lower the cost and reduce the complexity of the associated control driver. Even in a single-stage single-switch structure, the ability to step down input voltage is as effective as the cascade of two buck-boosts and one forward converter. Meanwhile, the proposed converter can avoid the low efficiency caused by a cascaded structure. Without an additional clamp circuit, the leakage energy stored in the transformer of the CHSDC can be still recycled so as to raise the efficiency of the converter and suppress voltage spikes at the power switch. Converter operation principle and key parameter design are discussed. Moreover, a 200 W prototype is built and then tested to validate the proposed converter and verify the theoretical analysis.
Highlights
Even though electric vehicles (EVs) have to be charged, the power for which comes from fossil-fuel plants, EVs can still reduce carbon dioxide production by 60% as compared with engine-system vehicles
The main power circuit of the proposed cascaded-like high-step-down converter (CHSDC) is depicted in Figure 3, derived from the integration of dual buck-boost converters and a forward con construct a single-stage structure with a single switch and galvanic isolation
To of C1 during SW-ON, that is, iLm1,avg iL1,avg, iL2,avg, and iC1,on, have to comprehend the finding, the waveform of iLm1 is depicted in Figure 12, based on which the current iLm1,avg can bethe computed as comprehend finding, the waveform of iLm1 is depicted in Figur current iLm1,avg can be computed as
Summary
Even though electric vehicles (EVs) have to be charged, the power for which comes from fossil-fuel plants, EVs can still reduce carbon dioxide production by 60% as compared with engine-system vehicles. The CHSDC two buck-boost one forward converter to be a single-switch singlestudied [20,21,22,23,24,25],integrates but high voltageconverters spikes and caused by the leakage inductance of a tran stage architecture It can accomplish a step-down voltage ratio as high as obtained by the need to be takenthree-stage into consideration [21,22,23]. CHSDC integrates two buck-boost converters and one forward converter to be switch single-stage architecture It can accomplish a step-down voltage ratio as obtained by the three-stage cascade of two buck-boost converters and one forw circuit
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