Performance analysis of a Ĉuk regulator applying variable switching frequency

This paper examines the performance of Ĉuk regulator to convert three phase alternating current (ac) to direct current (dc). Firstly, three phase ac is rectified with bridge diode. The rectified dc voltage is applied to input of a Ĉuk regulator. Three phase harmonics filter is introduced at the input of the diode rectifier to improve the shape of the input current. The main technique applied here to improve the performance of the regulator is a variable switching frequency which is applied to the gate of the IGBT; that is, at different duty cycle of the regulator, the switching frequency is different. The Total Harmonics Distortion (THD) of the input current and the efficiency of the regulator are observed. The results shown here are simulated with Pspise.