A single‐switch high‐gain DC–DC converter for photovoltaic applications

Abstract

This article presents a high-gain DC-DC converter consisting of a quadratic boost converter and a voltage multiplier, which helps to lift up the voltage gain. The gain will be further enhanced by increasing the turn's ratio of the coupled inductor. The key features include ultrahigh gain, low voltage stress across switching devices, low input current ripple, and hence, it is preferably suitable for renewable energy applications. A passive clamp lowers the voltage stress across MOSFET, so allowing switch with lower R ds(on) reduces the system cost. Besides this, input inductor makes current continuous and reduces input current ripple. The reverse recovery problem of diodes also gets diminished with the usage of leakage energy of the coupled inductor. The operating principle with different modes of operation is also explained. Zero current switching (ZCS) turn-on is achieved for power switch, and ZCS turn-off is achieved for diodes, which helps to reduce the switching losses. This improves the overall system efficiency. A 250-W prototype is built up to validate the converter.

Adaptive neuro-fuzzy approach for maximum power point tracking with high gain converter for photo voltaic applications

“…In addition, these configurations also provide high efficiency and low voltage stress [36−38]. From [39,40], it is noted that the cascaded configuration of boost converters exhibits ultra-high gain with an elimination of diode reverse recovery loss. At the same time, it is capable of achieving desired operating characteristics required for renewable applications.…”

Theoretical and experimental evaluation of SEPIC‐based DC–DC converters with two‐winding and three‐winding coupled inductors

“…By combining the coupled inductor with some techniques, the voltage level can be increased significantly. These techniques include voltage lifting, 14,15 voltage multiplier, 16–20 switched capacitor, 21,22 and switched inductor 23 …”

“…[9][10][11][12][13] By combining the coupled inductor with some techniques, the voltage level can be increased significantly. These techniques include voltage lifting, 14,15 voltage multiplier, [16][17][18][19][20] switched capacitor, 21,22 and switched inductor. 23 Disadvantages of the coupled inductor include large inductor magnetization current, using half of the B-H curve of core, and increased current ripple at the primary winding.…”

High step‐up active switched coupled inductor DC‐DC converter with voltage multiplier

“…Several sources can be considered in the scope of distributed generation, such as fuel cells (FC) and the photovoltaic cells (PV) 1–3 . These sources provide a low DC voltage (typically <50 V), so a high step‐up DC‐DC converter is required to increase this low voltage to high output voltage 4 . The standard boost converter and flyback converter are, respectively, the simplest nonisolated and isolated step‐up converters.…”

“…[1][2][3] These sources provide a low DC voltage (typically <50 V), so a high step-up DC-DC converter is required to increase this low voltage to high output voltage. 4 The standard boost converter and flyback converter are, respectively, the simplest nonisolated and isolated step-up converters. However, in these applications where high voltage gain is required, these standard converters cannot achieve good performance, due to the extreme duty cycle or high turns ratio of coupled inductor (CI) required to reach such a goal.…”