A Study on an Improved Three-Winding Coupled Inductor Based DC/DC Boost Converter with Continuous Input Current

Abstract

This paper proposes a novel high voltage conversion gain DC/DC boost converter for renewable energy applications and systems. The proposed converter utilizes a three-winding coupled inductor. The presented converter benefits from a unique advantage, as the actual turn ratio of the coupled inductor is decreased in the charging state of the coupled inductor. However, while the inductor is discharging, the actual turn ratio is increased. This feature leads to a very high voltage conversion gain. Furthermore, a passive clamp circuit is employed to recover the leakage current of the coupled inductor. The voltage stresses on the semiconductors are also reduced. In addition, the average current of the primary side of the coupled inductor is zero. This will reduce the total energy stored in the passive elements of the converter. The paper analyzes the Continuous Conduction Mode (CCM) and the operation principles of the presented converter are thoroughly derived. A 250 W laboratory hardware prototype is prepared to verify the proper operation of the presented converter. The obtained experimental results validate the feasibility of the presented converter.

A Novel Full Soft-Switching High-Gain DC/DC Converter Based on Three-Winding Coupled-Inductor

“…However, the input current with a high ripple is the most important drawback of these two converters, which limits their applications for renewable energy sources. Also, as it can be seen, the cost of the presented converter same as the converters in [15], [18], [20], and [29] is at a low level.…”

“…Nevertheless, in these converters, the use of TWCI at the input in series with DC voltage source creates a large input current ripple, which limits their performance in the RES applications. To solve this problem, three TWCI-based step-up converters with high voltage gain and continuous input current are suggested in [28][29][30]. In these converters, using a simple passive clamp circuit (consisting of a diode and a capacitor), the leakage energy of the TWCI is recycled.…”

A Novel Single-Switch High Step-Up DC–DC Converter with Three-Winding Coupled Inductor

“…For demonstrating the performance of the proposed converter, it is compared with other related converters presented in [12,14,16,18,25,27,[32][33][34][35]. In this study, the turns ratio…”

“…Various magnetically coupled impedance networks have been presented in the recent literature [7][8][9]. In [33], a Y-source impedance network is presented to allow more design degrees of freedom. Furthermore, to achieve flexible topological structures and to reduce the voltage stress of rectifier diodes, multi-winding coupled-inductors are employed.…”

Presented a transformer‐less buck‐boost DC–DC structure with vast voltage range

“…All of these converters have the inherent feature of a SEPIC structure that has a continuous input current. However, some of these converters are only able to enhance the output voltage, and also due to the leakage inductance of the magnetic coupling, they have a high ripple value across the input current [22]. Moreover, utilizing magnetic coupling increases the volume and value of the converter and complicates its structure [23].…”