Analysis and design of a converter based on noncascading structure

Abstract

: In the present work, a converter employing two noncascading structures, combined in a single circuit, ispresented. The power stored by the storage element is transferred to two subconverters by means of two storagecapacitors that complement each other. The stress on the main power switch is of interest as it reduces as the loadfalls, which in turn reduces the power loss. By means of the storage elements, the input power factor as well as the loadtransient response can be improved simultaneously. The overall efficiency is high because the amount of power processedtwice decreases. There is no need for tradeoff between the input power factor and load transient response because boththe capacitors can serve two purposes. The important feature of the circuit is that the capacitor voltages remain almostconstant and reduce as the load decreases, which results in small variation in duty ratio with a fall in load and hencebetter utilization of the switch. As an illustration, a 65-W, 18.5-V circuit is presented.