A DCM Based PFC CUK Converter-Speed Adjustable BLDC Drive

Apparao Bera, N. Sirisha


This paper proposes a DCM based PFC cuk converter-speed adjustable BLDC drive. This system has major advantages like: it is a money-making solution for low-power applications and it operates in discontinuous conduction mode also. The speed of the BLDC motor is controlled by dc-bus voltage of a voltage source inverter (VSI). VSI uses a low switching frequency to reduce the switching losses. A diode bridge rectifier followed by a Cuk converter functioning in a discontinuous conduction mode (DCM) is used for control of dc-link voltage. And also it will keep unity power factor at ac mains. Performance of the PFC Cuk converter is evaluated under four different operating conditions of discontinuous and continuous conduction modes (CCM). The performance of the proposed system is simulated in MATLAB/Simulink environment to validate its performance over a wide range of speed with unity power factor at ac mains.


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