Multilevel Modular Switched Capacitor Fed Dc Drive

This article presents to operate dc motor with high-efficiency by using zero-current-switching (ZCS) switched-capacitor (SC) dc-dc converter. Compared with the hard switching SC circuits, this circuit achieves ZCS for all the switches, thus minimizing the switching loss and electromagnetic interference noise. Compared to the electrolytic capacitor bank existing in the hard switching SC circuit, here in this circuit only a single ceramic capacitor of small size is used in each module to reduce the voltage ripple and achieve high efficiency. Different from other ZCS SC circuits that insert a magnetic core, the proposed circuit utilizes stray inductance that is present in series with the switch in the circuit to achieve ZCS, thus leading to small-size, low-cost, and high-reliability features. The circuit implementation and design consideration of ZCS SC dc-dc converters could be made for high-current and high-voltage-gain application. By using the proposed topology dc motor is operated with maximum speed and high efficiency.