NAME: MELISSA SENATORE

SUPERVISOR: DR. SHAWN NIELSEN

Demonstration System for Wireless Power Transfer (WPT)

Why is it needed?

Technology needs improving – distances and orientation of the devices to not be limited.

Current research: Electric car to automatically charge wirelessly while driving and/or

when not in use. Handheld devices to charge when you enter a certain room.

What has been done before?

Mobile Phone Charger

Light Bulb Electronic Car Charger

Approach and Method

Design considerations explored such as possible circuit designs, types of coil wire to use, and the calculation of system coefficients – resonant frequency, coupling coefficients, and mutual inductance.

Investigation

WPT methods include radiowaves, inductive coupling, and resonant coupling.

Radiowaves for far-ranged applications Inductive coupling for near-ranged applications Resonant for mid-ranged applications

Magnetic Resonance

Chosen method will be resonant coupling Most suitable for commercial needs Greater efficiency than radiowaves Longer distances than inductive coupling

First discovered in the US at Massachusetts Institute of Technology in 2007.

Inductive vs. Resonant Coupling

Main difference is that there is a capacitor in parallel with each coil

Inductive Coupling Magnetic Resonance

Direct vs. Indirect Power Feeding

Direct Feeding

Direct feeding - resonant structure has both the source and load connected to it, where as for indirect feeding, it is connected to the coils.

Indirect Feeding

Design

System will consist of: Power transformer High-frequency generator Oscillator Transmitting and receiving coils and circuits AC to DC converter Light bulb

Circuit Design

Future Plans

Conduct research on coil designs Build a test coil – decide on how many turns and how

loose or tight the windings need to be. Create a SPICE simulation

QUESTIONS?