An Optimized Switching Strategy for a Ripple-Canceling Boost Converter

Abstract

A hybrid switched-capacitor/interleaved boost converter able to provide a high voltage gain and to cancel the input current ripple at a preselected duty cycle was recently presented in the literature. This paper extends that work by proposing an optimized switching strategy for operating conditions at other values of duty cycle. The switching strategy effect on the converter's voltage gain and input current ripple is quantified and compared against the performance under the conventional switching strategy. The approach is validated in the laboratory through hardware prototyping.

Analysis and implementation of a step–up power converter with input current ripple cancelation

“…Similar topologies to those presented in Figure (left) can be found in converters with 2 stages . One particular feature of these converters is that the output voltage is taken from a single capacitor, due to the cascade connection of both converters.…”

“…Converters such as other works lie out of the comparison since they contain the quadratic term (1− D ) 2 . The ripple‐canceling boost converter from Soriano‐Rangel et al and the interleaved boost converter proposed are selected for the comparison.…”

Power quality improvement by interleaving unequal switching converters

“…Achieving zero current ripple is an attractive capability, traditional interleaving boost converter [6] can do that for specific duty cycles, but those specific duty cycles depends on the number of switching stages and cannot be arbitrary selected, canceling topologies [7,8] have the flexibility of selecting the operation point in which the input current have zero ripple. It is important to remember than in practice the duty cycle can change due feedback controller operation to maintain the output voltage, but in most cases there is a nominal value which remains most of the time.…”

“…Other publications in the state of the art proposed specially designed topologies to perfectly cancel the input current ripple in an arbitrary pre-selected duty cycle (or pre-selected gain) [7,8]. Another approach to overcome this challenge are active cancelation circuits [9,10], see Fig.…”

“…There are topologies in which the zero ripple cancelation point can be selected (flexible) [7,8,9,10], and they can be done with commercial devices, but they cannot be done with commercial converters. Using commercial converters instead of customized to achieve the discussed challenge can expedite the design process and reduce the cost, which is highly desirable.…”