Mini Wireless Power Transfer Module

Tech

Copper Coil, Power MOSFET, LEDs, DC Power Supply, Electromagnetic Induction, Resonant Coupling

Abstract

The Mini Wireless Power Transfer Module is designed to demonstrate the fundamental principles of inductive coupling and wireless energy transmission. The system utilizes a primary transmitter coil and a secondary receiver coil to transfer electrical energy without physical connectors. By employing a power MOSFET as a high-speed switch, the DC input is converted into a high-frequency alternating current, generating a fluctuating magnetic field. This field induces an electromotive force (EMF) in the secondary coil, which is then used to power low-voltage loads such as LEDs. This project provides a practical implementation of Maxwell's equations and Faraday's Law of Induction, offering a compact, low-cost prototype for educational visualization of energy transfer efficiency and magnetic resonance.

Keywords

Wireless Power Transfer, Electromagnetic Induction, Inductive Coupling, Copper Coil, Power MOSFET, Magnetic Field, Resonant Energy Transfer, Low Voltage DC, Faraday's Law, Circuit Design, Energy Harvesting, DIY Electronics, Switching Frequency, Mutual Inductance, EMF, Power Electronics

Project Description

In modern electronics, the reliance on physical cables and connectors often leads to wear-and-tear, safety hazards in wet environments, and limitations in device mobility. The Mini Wireless Power Transfer Module addresses these challenges by implementing a cable-free energy delivery system based on the principle of mutual induction. The primary objective of this project is to create a functional prototype that can transmit power across a small air gap to light up a set of LEDs, proving the feasibility of wireless charging concepts. The approach involves constructing two hand-wound copper coils. The transmitter side consists of a DC power source and a MOSFET-based oscillator circuit that converts steady DC into a high-frequency AC signal. This creates a dynamic magnetic field around the primary coil. When the secondary coil is placed within this field, the changing magnetic flux induces a current in the receiver coil according to Faraday's Law. This induced current is then utilized to drive the load. From an engineering perspective, this project explores the relationship between coil geometry, distance, and power efficiency. It serves as a foundational model for understanding how wireless power can be scaled for industrial applications, such as medical implants or electric vehicle charging. By removing the need for physical contact, the system enhances durability and allows for the sealing of electronics in waterproof or vacuum-tight enclosures, providing significant societal value in the evolution of consumer electronics and industrial automation.

Project Features

• Cable-free energy transmission via inductive coupling
• High-frequency switching using Power MOSFETs
• Custom hand-wound copper coil architecture
• Low-voltage DC operation for safety and portability
• Visual verification of power transfer using LEDs
• Compact and lightweight cardboard mounting frame
• Adjustable transmission distance for efficiency testing
• Simple modular design for easy assembly and disassembly
• Demonstrates real-time electromagnetic field interaction
• Low-cost implementation using standard electronic components

Specifications

• Hardware components: Copper Magnet Wire, Power MOSFET (IRF series), Resistors, Capacitors, LEDs, DC Power Supply (5V-12V), Cardboard Base, Connecting Wires
• Software components: None (Hardware-based Analog Circuit)

Report Contents

• Components List (BOM: Bill of Material)
• Block Diagram
• Flow Chart
• Components: Name, Images, Details
• Circuit Diagram
• Problem Statement
• Abstract
• Introduction
• Methodology
• Challenges and Solutions
• Performance Analysis
• Advantages
• Limitation
• Application
• Future Scope
• Conclusion
• Output Images
• Project Deliverables
• Project Hardware
• Project Report
• Project Simulation

Applications

• Wireless charging for low-power IoT sensors
• Educational kits for physics and electronics labs
• Waterproof LED lighting for sealed enclosures
• Contactless power for small robotic components
• Prototype for medical implant power delivery
• Miniature wireless power displays for exhibitions

Advantages

• Eliminates the need for physical wiring and connectors
• Reduced mechanical wear and tear on charging ports
• Enhanced safety by isolating the power source from the load
• Enables power delivery to completely sealed devices
• Simple circuit design with minimal components
• Low power consumption suitable for small-scale projects

Limitations

• Very short transmission range (centimeters)
• Significant energy loss due to heat and air gap
• Efficiency drops sharply as distance increases
• Limited to low-power loads like LEDs
• Sensitive to alignment between primary and secondary coils

Future Scope

• Integration of a voltage regulator for stable output
• Implementation of a resonant frequency matching circuit
• Use of ferrite cores to increase magnetic flux density
• Adding a battery charging circuit for portable devices
• Scaling the system for higher power delivery capacities

Conclusion

The Mini Wireless Power Transfer Module successfully demonstrates the practical application of electromagnetic induction to transmit energy without physical contact. By utilizing a MOSFET-driven primary coil and a passive secondary coil, the project achieves a visible transfer of power to an LED load. While the system is limited by a short operational range and moderate efficiency—typical of non-resonant inductive coupling—it effectively validates the core physics of wireless energy. The trade-off between simplicity and range makes this an ideal educational tool for students to explore power electronics. Ultimately, this project lays the groundwork for understanding more complex wireless charging standards, contributing to the broader goal of reducing electronic waste by eliminating redundant cables and improving the longevity of device interfaces.