PROJECT TITLE :
High-Power-Factor Rectifier Using the Modified SEPIC Converter Operating in Discontinuous Conduction Mode
ABSTRACT:
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 in this paper. The proposed converter presents a low input current ripple operating in DCM, and also the switch voltage is under the output voltage. The switch voltage reduction will increase the converter reliability and a coffee drain-to-source on-resistance ( $rm RDS_rm on$) MOSFET can be used relying 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 ninety five.vi%.
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