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High power factor rectifier using the modified sepic converter operating in discontinuous conduction mode
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High-power-factor rectifier using the modified sepic converter operating in discontinuous conduction mode

Category : Power Electronics


Sub Category : AC TO DC CONVERTERS (RECTIFIERS)


Project Code : ITPW03


Project 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 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%

EXSISTING SYSTEM

In existing system, PFC rectifiers have been introduced to improve the rectifier power density and reduce noise emissions via soft switching techniques. However, all of these rectifiers operate in DICM and suffers from high switch current stress causing higher conduction losses. PFC rectifiers allow the current to flow through two bridge diodes in addition to the switching component of the converter. This results in higher conduction losses increasing the thermal stresses of the converter. Due to efficiency of the system should reduce.

 

PROPOSED SYSTEM

 

The SEPIC converter circuit can perform PF control in the high-frequency ac–dc power converter, which significantly simplifies the control circuit. It can maintain good power factor. Loss also reduced.  These soft-switching techniques have substantially eliminated the switching loss.
 
 
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