The Improvement Switching Technique for High Step-Up DC-DC Boost Converter

Abstract

This paper proposes the non-isolated DC-DC converter with high boost ratios and efficiency. We suggest boosting methods including voltage multiplier cells or coupled inductors. However, both techniques have a limited constant voltage multiplier coefficient according to the fixed configuration. Therefore, in the proposed method, we change the multiplier factor (as the number of activity levels) and combine it with the turn of the appropriate duty cycle; these factors are considered at the same time in order to increase the energy conversion efficiency and expand the control area of the duty cycle. A mathematical analysis of the losses of the components in operation modes shows that the boost ratio and efficiency are functions of the number of activity levels and duty cycle. Therefore, this paper proposes an algorithm for tracking the activity levels and duty cycle in order to obtain the maximum efficiency. The simulations produced with the Powersim-PSIM software, and the experiments with load capacities of 250 W, 500 W and 1000 W, boosting the ratio by more than ten times, were conducted in order to clarify the capabilities of the proposed configuration.

Estimating the potential maximum power point based on the calculation of short‐circuit current and open‐circuit voltage

“…The extreme duty cycle stresses the switches in high‐output voltage applications, increasing the current ripple and reducing the system's stability. In these cases, the high step‐up topologies or step‐down structure are applied to limit stress on switches, reduce ripple continuous input current, smooth switching of diodes, substantial voltage gain at a low duty cycle, low cost, and improve power efficiency [30–32]. Alternatively, the converters should be designed to operate stably around the value D = 0.5.…”

An Overview of Non-Isolated Hybrid Switched-Capacitor Step-Up DC–DC Converters

“…Another possibility is using the quadratic boost converter to drive the voltage multiplier, as explored in [90,91], or topologies with multiple inductors [92][93][94][95], Z-source networks [96,97], and the cascaded connection or the interconnection with sets of multipliers in different manners [98][99][100][101].…”