A quadratic high step-up DC-DC converter with voltage multiplier

Abstract

By cascading two different converters being a quadratic step-up converter and adopting voltage multiplier achieve extra ratio of voltage conversion with appropriated duty ratio and low turn ratio of the coupled inductor. However, the energy stored in the leakage inductor of the coupled inductor can be recycled to the output capacitor. The operating principles and steadystate analyses of continuous conduction mode are discussed. A 200-W/ 400-V prototype sample is implemented with input voltage 20-V. The maximum efficiency of 93.2 % is reached; the full load efficiency remains at 89.5 %.

An active clamp coupled inductor‐based soft‐switched quadratic boost converter

“…T A B L E 1 Performance comparison of the proposed converter with existing converter topologies Parameters Converter in 23 Converter in 24 Converter in 6 Converter in 25 Converter in 4 The proposed converter…”

“…However, cascade conversion increases the number of controlled switches and parasitic elements, causes higher conduction losses, and degrades converter efficiency. A single switch quadratic boost converter is the appropriate choice for high gain step‐up DC–DC power conversion within low duty ratio operation 4–6 . Further, several quadratic boost converters with various boosting techniques are proposed in literature such as switched inductor, switched capacitor, and voltage multiplier with a coupled inductor and active clamp circuitry 7–12 .…”

An Interleaved Quadratic High Step-Up DC-DC Converter With Coupled Inductor

“…By applying the amp-balance law to the capacitors, their average currents could be determined for all the operation stages. For Stage 3, the average currents of the capacitors are given by (22). Then, by considering the maximum voltage ripple of y%, the capacitances can be calculated from (23).…”

“…In addition, the proposed converter has an interleaved structure that leads to a low input current ripple and low current stresses of the components. Thus, it was helpful to compare the proposed converter with two categories of existing high step-up converters: 1) non-interleaved quadratic converters, including both non-CI-based topologies in [16][17][18] and CI-based structures in [19][20][21][22][23]; 2) interleaved converters, including both non-quadratic converters in [24][25][26][27][28][29][30][31] and quadratic topologies in [32][33][34][35]. Thus, the proposed converter is compared to 20 existing converters in the literature to cover all aspects of comparison; 12 of them are quadratic high step-up converters and the rest is non-quadratic.…”

“…In addition, the converters in [16][17][18] lack the interleaved configuration that is useful for renewable energy applications where a low input current ripple is required. Considering the CI-based quadratic converters in [19][20][21][22][23], the voltage gain of the converter in [23] is higher than the proposed converter, but it has two additional components. The voltage gain of the converter in [21] is slightly higher than the proposed converter, but the difference is not significant, and it does not have the interleaved configuration that is essential to reduce the input current ripple.…”