International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 03 | Mar 2025
p-ISSN: 2395-0072
www.irjet.net
OPTIMIZED HYBRID SOLAR AND TRANSFORMER-POWERED MWJC FOR HIGH-VOLTAGE DC- DC CONVERTERS Dr .M. Jegadeesan, Muhundana AR V, Sindhiya S, Tharani S K Department of Electrical and Electronics Engineering, K.L.N. College of Engineering, Pottapalayam, Sivagangai, Tamil Nadu, India *** conventional power supply and a solar input, demonstrating Abstract - In this project, a high-gain DC-DC converter is designed and implemented to step up a low input voltage of 24V to an intermediate voltage of 150V, which is further boosted to 350V. The proposed system utilizes a multi-stage conversion process with eight MOSFET switches to achieve high efficiency and voltage gain. The first stage of the converter provides an initial boost to 150V, followed by a secondary stage that increases the voltage to 350V. An experimental prototype was developed to validate the design, and extensive testing was conducted to evaluate its performance under different operating conditions. The results confirm the feasibility and effectiveness of the proposed system, making it suitable for applications requiring high voltage DC conversion.
Key Words: Power Conversion, Opto Coupler, Step-Up Converter, Switching Regulator, MWJC, DC-DC Converter, MOSFET, Boost Converter, Voltage Regulation, Micro Controller
1. INTRODUCTION DC to DC converters are integral components in power electronics, used in applications requiring the conversion of a DC voltage from one level to another. Common configurations of these converters include buck, boost, and buck-boost converters, which allow voltage step-up or stepdown based on the needs of the system. However, certain applications demand a high voltage gain with stability, which presents challenges for traditional converters. The Watkins Johnson Converter (WJC) stands out for its ability to achieve high voltage gain with a minimal number of storage elements. While the WJC can deliver a positive output voltage by simply controlling the duty cycle, it does require multiple switches, which may introduce switching losses. The main advantage of the WJC is that it does not require any changes in topology when reversing the output polarity. This work focuses on enhancing the WJC by adding a third leg to its existing two-leg configuration, improving its voltage gain without using a tapped inductor. Instead, two separate, noncoupled inductors are utilized to avoid the complexity of magnetic coupling. The modified Watkins Johnson Converter (MWJC) is modeled using MATLAB SIMULINK, and the system’s performance is analyzed through its transfer function, Bode plot, and Root Locus studies. Experimental validation is conducted with two power sources: a © 2025, IRJET
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the MWJC’s potential for high-efficiency DC-DC conversion in renewable energy applications.
2. OVERVIEW This project focuses on the development, simulation, and experimental validation of a novel high-boost DC-to-DC converter topology. The proposed design extends the existing two-leg Watkins-Johnson (WJC) converter by incorporating a third leg, along with additional inductors and capacitors, to achieve enhanced voltage gain. This modified converter, referred to as the Modified Watkins-Johnson Converter (MWJC), aims to improve the performance and efficiency of conventional converters. The study involves the design and simulation of the MWJC in the MATLAB SIMULINK environment to analyze the behavior and voltage gain under various duty cycles. An experimental prototype was developed to validate the simulation results. The system operates in an open-loop configuration to demonstrate the voltage gain improvement and provide insights for potential future control strategies.
2.1. DC-DC Converter DC-DC converters are electronic devices used to change DC voltage levels efficiently. They are necessary because DC power cannot be transformed directly like AC power. These converters are used in various applications, such as stepping down 24V DC from a truck battery to 12V for a radio, or stepping up 12V DC to higher voltages in power supplies. The efficiency of these converters is crucial, as they aim to minimize power loss during conversion. A perfect converter would have no losses, but in practice, some energy is lost due to the converter’s components. Efficiency is typically above 80-90% in modern converters, making them as efficient as AC transformers.
3. EXISTING SYSTEM 3.1 MODIFIED WATKINS JOHNSON CONVERTER The topology of the existing two leg WJC. The WJC can be viewed to have two modes of operation. In mode 1 the Switch module SW1, the inductor L, Switch module ISO 9001:2008 Certified Journal
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