PFC Based Bridgeless Cuk Converter For SRM Drive

A bridgeless PFC (Power Factor Correction) converter is proposed to feed a switched reluctance motor (SRM) drive in this work. The new Cuk converter generates two symmetrical voltages with no extra voltage loop. The new converter eliminates diode bridge rectifier (DBR) thus reducing the semiconductor switches in current path. A double cell structure utilizes two Cuk converters, which operates for two half cycles of the AC mains, separately. The proposed topology operates in discontinuous conduction mode (DCM), which reduces the size, weight and cost of the proposed drive. The speed control of proposed drive is obtained by regulating converter output voltage over a wide range. However DC link voltage based control, eliminates speed sensor requirement, which makes the drive cost effective. Test results are presented for proposed converter converting universal AC input voltage (90V -270V) to varying DC voltage for speed control of SRM. Test results demonstrate the power factor close to unity with input current THD (Total Harmonic Distortion) below 5% as per the given IEEE-519 standard.