Undergrad Research Project - Class E Transmitter

Fall 2015

Student
Meghan Kaffine
Advisor
Shawn Kelly
Project description

The class E amplifier is a highly efficient switching power amplifier that is used at high frequencies. Due to the high frequencies, the switching time of the amplifier is the same as the duty cycle, and requires precision tuning. In this case, the class E amplifier uses a paired coil system to power the prosthetic. One (the primary) coil is attached to the class E amplifier and used to transfer power to the other (secondary) coil on the prosthesis in the eye. The coil is represented by the equivalent inductance, capacitance, and resistance in the class E circuit. Those values are set, and instead the values of the other capacitors in the circuit are changed. This will involve running circuit simulations using PSpice to simulate the circuit prior to actual testing of the physical circuit, tuning the amplifier and characterizing the power transfer efficiency, and tuning the Q factor of the circuit. The Q factor of the circuit is the measure of quality of the circuit. A higher Q value, the better the quality of the circuit.

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