Abstract
This paper presents a power factor corrected (PFC) new bridgeless (BL) Cuk Topologies for low power applications. A BL configuration of Cuk converter is proposed which eliminates the usage of diode bridge rectifier at the front end of the PFC converter, thus reducing the switching and conduction losses coupled with it. This new BL Cuk converter has two semiconductors switches. The current flow during each switching cycle interval of the converter reduces the conduction losses compared to the conventional Cuk PFC converter. It also reduces the input current ripple and Electromagnetic Interference (EMI). The inrush current during the starting period is limited and the input, output currents of the converter are continuous with minimum current ripple. Hence it is preferred mostly compared to other PFC circuits. The proposed topology works in the Discontinuous Conduction Mode (DCM) with simple control circuitry to achieve almost a unity power factor with less distortion in the input AC current. The switching of the power switches is done under zero current. The proposed PFC topologies are theoretically investigated and performance comparisons are made with the conventional rectifiers. The proposed PFC converter is simulated in MATLAB/SIMULINK with Fuzzy Logic Controller (FLC) and results are demonstrated to evaluate the effectiveness of the controller.
Highlights
The active power factor correction circuits for low and medium power applications have been increasing in recent years [1], [2] with the choice of research to improve the power quality according to the harmonic regulations and standards
The input voltage and current waveforms obtained from the SIMULINK software model of fuzzy Controlled Bridgeless Type-3 Cuk power factor corrected (PFC) rectifier are shown in Figure and Figure
BL Cuk topologies based on fuzzy controller have been presented for power factor correction in this paper
Summary
The active power factor correction circuits for low and medium power applications have been increasing in recent years [1], [2] with the choice of research to improve the power quality according to the harmonic regulations and standards. Most of the active PFC circuits comprises of a front end diode bridge rectifier (DBR) which distorts the utility line voltage This reduces the supply power factor and the optimized usage of utility system [3]. In order to maximize the rectifier efficiency, many research works have been directed towards designing the bridgeless PFC converters with the elimination of Diode Bridge at the front end [3] The current in this bridgeless PFC converter is made to flow in minimum number of switches. A bridgeless buck PFC converter for step down voltage applications was proposed This buck PFC converter has high total harmonic distortion (THD) [4], [5] and low power factor. A comparison is made against the efficiency, power factor correction and reduction in THD for all the Cuk PFC rectifiers
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