The theoretical and experimental
analysis of a modified version of the SEPIC dc–dc converter
used as preregulator operating in discontinuous conduction mode (DCM) is
presented . The proposed converter presents a low input current
ripple operating in DCM, and the switch voltage is lower than the output
voltage. The switch voltage reduction increases the converter reliability and a
low drain-to-source on-resistance (RDSon ) MOSFET can be used depending on the
converter specification. Moreover, a digital control technique is applied to
the proposed converter in order to reduce the third-harmonic input current
distortion resultant of the operation in DCM. Finally, a 100-W prototype was
developed operating with efficiency equal to 95.6%..
FOR MORE DETAILS: MODIFIED SEPIC CONVERTER
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