UNWIRED II
#1

UNWIRED II
PRESENTED BY:
Michael Riewer,
Mustafa Alnass,
Chris Danzl

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Wireless Energy Transfer
 Recently there has been an increase in independent electrical devices such as cell phones, laptops, and PDA’s. These devices all require recharging at some point and thus have created an interest in wireless energy transfer. The goal is to create a truly wireless system to transmit energy.
Requirements
 Create a draft of an academic paper to publish on wireless energy transfer.
 Create a system of receiver and antennae to show wireless energy transfer through magnetic resonance coupling.
 Follow existing UNWIRED group.
 At the end of the semester be close to the point where UNWIRED I group is in regards to their circuit.
Technical Content
 Magnetic Resonant Coupling can transfer energy because at resonance there is the least amount of impedance and the transmitter can send the most power and the receiver can receive the most power.
 An opera singer shattering a wine glass is comparable to the resonance which we are using in our circuits.
MATLAB Example of Resonace
 Ideal Components
 Actual Components
Example of how wireless energy transfer works
 Magnetic fields can pass through most objects
Important Formulas
ω = 1/(√LC)
◦ ω is resonant frequency where L is the inductance of the coils and C is the capacitance added.
◦ Tau is the resonant width due to the objects intrinsic losses and k is the coupling coefficient.
Q = ω / (2*Γ)
◦ High values of Q allow the circuit to perform optimally.
Project Status
 Our group has researched the available methods of wireless energy transfer and studied the Witricity method in depth.
 Academic Paper – We have a draft of our academic paper on wireless energy transfer started.
 We have created a transmitter and receiver out of wire and have been able to send energy.
 Project Status - Cicuit
 Tuning both transmitter and receiver to resonance by adding capacitors in series/parallel.
Current amplifier on transmitter side of circuit.
 Measuring the amount of power transferred and received and thus calculating efficiency. (Power sent)/(Power received)
Working Transmitter and receiver
 The Blue diode in the corner shows our wireless energy transfer
Transmitter and Receiver Circuit
 Transmitter on left and receiver on right
Problems Encountered
 Design
 Current Amplifier
 Efficiency
 Problem Created
 Small transistors
 Lack of earth ground, Distance
Budget
Summary

With increased need for wireless energy transfer, more and more research will be done to perfect the process. We have researched wireless energy transfer and have gained a greater understanding in how it works. With this understanding we have created a working circuit to transfer energy truly wirelessly. We have came close to reaching out goals for the semester but still leave much to do for our last semester. We will work at perfecting our circuit and hopefully implementing it into medical devices.
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