Abstract
A bi-directional converter (BDC) is important in applications where energy storage devices are involved. Such applications include transportation, battery less UPS, Flywheel Energy Storage (FES) systems etc. Bi-directional power flow through buck and boost mode operation along with high power density and proficiency are significant requirements of such systems. This paper presents a new BDC topology using MOSFET with a novel control logic execution to attain zero switching losses through Zero Voltage Transition (ZVT) and Zero Current Transition (ZCT) techniques. The presented scheme assures Zero Switching Power Loss (ZSPL) for both buck and boost modes of operation of the BDC. The scheme is easy and achieves ZSPL during both turn-on and turn-off of the devices ensuing in improved efficiency and reduced EMI problems. The essential principle of operation, analysis, and design process are proposed for both buck and boost modes of operation. A design example is presented.
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