International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 12 Issue: 11 | Nov 2025
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p-ISSN: 2395-0072
“Pocket Power Inverter” 1Prof. Rohan Shinde, 2Hardik Sakhuja, 3Ananya Kadam, 4Anuja Kadam, 5Adarsh Singh 1Assistant Professor, 2,3,4,5UG scholar, Electronics & Communication Engineering Department,
School of Engineering & Sciences, MIT Art, Design & Technology University, Pune, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract – Increased use of electronic devices demands 2. Literature Survey: portable and backup power supplies, particularly in regions with unreliable grid power. This paper describes in detail the design, construction, and performance analysis of a compact low-cost mini inverter that converts 12V DC from the battery into 240V AC. The design is intentionally simplified and microcontroller free for ease of replication and costeffectiveness. At the heart of the circuit is a CD4047 multivibrator IC that provides a 50 Hz oscillator to drive a pair of IRFZ44N power MOSFETs configured in a push-pull arrangement. The amplified AC is then stepped up to 240V using a custom-wound ferrite core transformer. The prototype incorporates essential protection in the form of an input fuse. Rigorous testing under various load conditions including resistive, inductive, and nonlinear loads yielded a stable output of 235V AC at 50 Hz and peak efficiency of 84%. These results confirm that this design is a robust practical and educational solution for powering small household appliances and electronic gadgets
The basic topology of simple inverters is very well established in general electronic literature. The CD4047 IC used as a stable oscillator for obtaining the fundamental frequency of 50/60 Hz has been one of the evergreen methods presented by various electronics engineers over a couple of decades for its reliability and simplicity [1]. These are usually compared to advanced designs using specialized PWM controllers such as the SG3525, which afford much better voltage regulation [2]. For high fidelity power, pure sine wave inverters are needed, but they use complex circuitry including microcontrollers and LC filter networks, which raise the cost and complexity [3].
MOSFET, Push-Pull Amplifier, Ferrite Core Transformer, Modified Sine Wave.
The design described in this paper is based on a classical oscillator-driven approach. It differs in its holistic approach to the design for practical implementation, especially in the use of a high-frequency ferrite core transformer to reduce size and weight compared to conventional laminated iron-core transformers, as well as in providing real-world performance data from a working prototype [4].
1. INTRODUCTION
3. System Design and Methodology:
The need to keep basic electric appliances, such as lighting, communication devices, and laptop computers, running during a power outage is significant both at home and on mobile platforms. Inverters are critical links that convert readily available DC from sources such as lead-acid batteries or solar panels into utility-standard AC.
The inverter system consists of three major stages: the Oscillator Stage, the Switching/Amplifier Stage, and the Output Stage. Figure 1 shows the block diagram of the system.
Keywords: Mini Inverter, CD4047, A stable Multivibrator,
Commercial inverters are usually complicated and expensive, as the complexity of their design is increased by adding microcontrollers to produce pure sine wave and advanced battery management. However, for most practical applications, such as incandescent lighting, fans, and phone chargers, a "modified sine wave" inverter will do well and can be very simple and much more economical. This project deals with designing and building a mini-inverter. The key drivers for this design are keeping the circuitry simple using easily available components and resulting in compact form factor and thorough analysis of its performance, which makes it an ideal subject for an academic mini-project and a practical power solution.
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