0 Hz 1 0 W 1 CONVERTER 1 DC-DC power convertors 1 RECTIFIER 1 also high maximum current stress 1 circulating current power quality improvement 1 current maximum current stress 1 design parameters optimisation existing structure 1 frequency 50 1 harmonic distortion 1 inductors 1 input capacitor 1 input inductors 1 input line frequency 1 maximum input voltage ripple 1 modified single-switch bridgeless PFC SEPIC structure 1 modified structure 1 power 160 1 power convertors 1 power factor 1 power factor correction 1 power supply quality 1 switching convertors 1 total harmonic distortion current 1