Figure 1: Wireless power transfer prototype with primary and secondary coils.
Project Overview
Designed and demonstrated a wireless electricity transfer prototype using electromagnetic induction to power small loads without physical electrical connections.
This project was developed to understand the fundamentals behind modern wireless charging systems.
Engineering Objective
To validate short-range wireless power transmission using low-cost electronic components and demonstrate feasibility for educational and experimental applications.
Technical Approach
High-frequency switching circuit using an NPN transistor
Primary and secondary copper coils tuned for resonant coupling
DC power input (9–12V)
Load testing using LED and low-power bulbs
Tools & Components
NPN Transistor (2N2222 / BD139)
Copper coils (Primary & Secondary)
DC Power Supply
Passive components (resistors, switch)
Results
Successfully powered an LED wirelessly over short distance
Stable induction achieved within designed parameters
Demonstrated core principles used in commercial wireless chargers
Key Learnings
Coil alignment and frequency tuning are critical
Power loss increases rapidly with distance
Heat management is important for switching components
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