Embedded Current-Fed Switched-Z-Source Inverters

In this paper, two new structures for embedded current-fed switched-Z-source inverters (ECSZSIs) are proposed. The proposed inverters can generate high output current from low input current and they have a good immunity against the open circuit of the legs and electromagnetic interference (EMI). The proposed structures have the less number of passive elements in comparison with the conventional current-fed Z-source inverter (CZSI) to generate the same current boost factor. In addition, the proposed structures have the continuous input voltage. Complete analyses of the performance of the proposed structures in different operating modes are presented and the voltages and currents equations of all elements are calculated. Moreover, the switching pattern based on pulse width modulation (PWM) is proposed. The comparison between the proposed inverters and conventional CZSI is presented, too. Finally, the simulation results using PSCAD/EMTDC software are presented to reconfirm the accuracy of theoretical analyses and obtained equations.